US2700535A - Apparatus for applying a cement coating - Google Patents

Apparatus for applying a cement coating Download PDF

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US2700535A
US2700535A US234338A US23433851A US2700535A US 2700535 A US2700535 A US 2700535A US 234338 A US234338 A US 234338A US 23433851 A US23433851 A US 23433851A US 2700535 A US2700535 A US 2700535A
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air
valve
aggregate
tank
conduit
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US234338A
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Russell J Harrington
Richard P Harrington
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F21/00Implements for finishing work on buildings
    • E04F21/02Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
    • E04F21/06Implements for applying plaster, insulating material, or the like
    • E04F21/08Mechanical implements
    • E04F21/12Mechanical implements acting by gas pressure, e.g. steam pressure

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  • .20.Claims. (Cl. 259-451) apparatus for applying automatically mix the cement stream and a stream of .water in desired proportions, and to apply the wetcement mixture by pneumatic pressure onto the surface desired to bencoated.
  • a further object of this invention is to provide a unitary controlmeans for controlling the flow of dry cement aggregate and the-flow of water to the spray gun.
  • Figure l is aperspective .view showing the operator applying a cement coating-in accordance with thepresent invention and showing the-transportable: assembly of the i cement, air'and water sources, and controls therefor, employed in the present invention.
  • Fig. ,2 is aperspective'viewof the-spray gun for applying the wet spraycoating of cement, including the mixing valve for mixing the streams of dry cement-and water at the 'dischargeanozzle.
  • FIG. 3 isanother-pcrspective view of the spray gun, taken from the opposite side from the view :of-zFig. 2.
  • Fig. 4 illustrates theharness and --breathingmask worn by the --operator.
  • Fig. 5 is a front view, with certainof the-parts omitted for -clearness, of the :transportable assembly of dry cement, air and water'sources, accordingto the present invention.
  • Fig. 6 is a rear View of the assembly'of Fig. 5.
  • Fig. 7 is an end view'of the assembly'of'Figs. 5 and 6.
  • Fig. 8 is a section illustrating the conduits,'valves and control mechanism 'which'govern the supply of dry cement aggregate, air'and water from the unitary. transportable assembly thereof.
  • Fig. 9 is a vertical section transversely .alon'g the middle of Fig. 8, viewing toward the left .therein, illustrating particularly the valve controlling the flow of dry aggregate to the discharge nozzle.
  • FIG. 10 is a top vview in section of the Fig. 9 structure.
  • Fig. 1-1 isa section along theline -1111.of Fig-l 10 illustrating the mechanism controlling a valve whichcontrols, the flow of air into.v thecement valve.
  • Fig. 13 is a's'ection along the line 1-3-13 of Fig. 10 illustrating the mechanism controlling a valve which controls the flowof'agitating air into the tank 'ofa'ggregate.
  • Fig. '14 is a section along the line 1414 of Fig. v10 illustrating the'positions in the aggregate tank of the cement valve and of the'conduit for dischargingagitating air into the tank.
  • a'tru'ck 10 is provided with a rearwardly extending frame :11 adapted to support the components of the invention, so that the entire'assembly is readily transportable to andfrom the job.
  • An air storage tank '12 is connected to receive and contain air under pressure from an air compressor 13.
  • 'A- water tank14 is also supported by the-truck frame, as is an-upright cylindricaltank 15 which contains an aggregate-of dry sand and cement, to be ultimately mixed with water and the resulting wet mixture sprayed-onto the surface to be coated, in the manner
  • a ladder '16 on the truck frame permits the operator to have ready access to manual shut-off valves "adjacent the :compressed air tankand the-water tank, allof these valves -being grouped above a horizontal platform 17-which extends over the water tank. Access -to the aggregate tank 15 may *be had through a-detachable top closure 18.
  • One outlet conduit 19' from the air tank-12 is connected to communicate with the aggregate tank, for a purpose which will be apparent hereinafter.
  • a manual shut-ofi valve-20' controls the supply of air to conduit 19.
  • Another outlet conduit 21 from air tank 1'2 connects with-a fitting 22 which communicates through pipe 23 to the top of the water tank.
  • a portion of'the compressed air from-tank 12 is used to keep the water in tank 14 under pressure and thereby insures the desired water flow therefrom.
  • Manual valve 24 controls the pressurized air supply to the watertank.
  • -The"water flow from tank 14 flows past outlet valve 26.
  • -Valve 25 is a reliase valve for releasing air from the top "of the "water tan Air compressor 13 is provided witha pipe 13acommunicating with an exhaust outlet 13b leading to the atmosphere.
  • Suitable valve means may-be provided for selectively directing this exhaust from the air compressor into-a conduit 14a which extends into thewater tank 14 at the bottom thereof to form aloop therein and terminates in an exhaust pipe 14b communicating with the atmosphere.
  • the water within water tank 14 may be heated to avoid freezing thereof during cold weather.
  • the air conduit 19 leads from air tank 12 through a swivel connection 19a to a coupling 27 having two outlet conduits,.28 and.29.
  • Conduit 28 in turn connects with another coupling 30 having two outlet conduits, 31 and 32.
  • Conduit 31 leads through valve 33 to a U-shaped horizontal conduit 34which is disposed within the aggregate tank adjacent the bottom thereof.
  • At its inner side conduit 34 is formed-with a plurality of openings 35 through which feed air escapes to exert an upward and centrally directed force against the sand-and cement in tank 15 and to agitate andmix the same.
  • At its other endfeed air tube 34 is provided with a closure cap 36, so that the entire supplyof air to tube 34 is dissipated within the aggregate-tamer Cap 36 is-readily removable from conduit 34 to permit-cleaning out of the latter.
  • Conduit 32 leads through valve 37 to a drive'air conduit 38 which is open at its free'end.
  • the freeend of eductor conduit 38 is disposed within a tubular assembly,
  • the tubular assembly 39 includes a fixedly positioned inner tube 40 formed with an elongated slot 41 extending lengthwise along its bottom'portion.”
  • outer tube 42 is snugly rotatably disposed about tube 40 and is formed with an elongated slot 43 adapted to register with the slot 41in tube 40.
  • the tubular assembly 39 forms a sleeve valve controlling the flow of the aggregate from tank into tube 40.
  • a lever 44 Fixedly secured by a collar 44:: to the outer tube 42 of the sleeve valve and thus adapted by its angular position to control the alignment of the slots 41 and 43.
  • Suitable bearing mountings 45 and 46 support the tube 42 for rotation at the front of the aggregate tank 15.
  • Inner tube 40 also extends through the front of tank 15 and is fixedly connected to an upwardly extending cylindrical chamber 47.
  • a box-like housing 48 surrounds the forward end of tubes 40 and 42, the connection of lever 44 to tube 42, and the lower portion of chamber 47 at its connection to inner tube 40.
  • a peripheral slot 49 is formed in housing 48 to extend around the upper half thereof. Slot 49 extends completely across the top of housing 48 and about half-Way down each side thereof.
  • Lever 44 is positioned to move in this slot as it is rotated about its pivotal axis about tube 40.
  • the shoulders formed by the ends of the slot 49 at the respective sides of housing 48 define the extreme limits of movement of lever 44.
  • valve 37 which controls the flow of air to drive air pipe 38 is controlled by a plunger 50 which extends upwardly beyond the casing of valve 37.
  • Plunger 50 is biased upwardly by spring means (not shown) in valve 37 tending to maintain the valve closed and prevent the fiow of air to drive air pipe 38.
  • 'A U-shaped bracket 51 is secured to the valve casing and has two spaced u standing arms 52, 53 extending thereabove.
  • a lever 54 is pivoted on arm 52 and is formed with a head 55 p sitioned to bear against the to of plunger 50.
  • Arm 53 pivotally carries a lever 56 which has one arm 57 extending toward plunger 50 and has its free end positioned to overlie the head portion 55 of lever 54.
  • a coil spring 58 urges the free end of arm '57 downwardly to exert downward force on the head portion 55 of lever 54 and on the valve plunger 50 to open valve 37 and permit the fiow of air to drive air pi e 38.
  • Lever 56 is also formed with an upstanding arm 59 which has a cam surface 60 at its up er end located in ali nment wi h the slot 49 in which lever 44 moves.
  • a bracket 61 affixed to the inner side of the front wall of housing 48 pivotally su ports a bell crank lever 62 hav ing a long arm 63 which has a transverse segment 6341 at its free end overlying the lever 54 at the side of the pivotal axis thereof remote from head 55.
  • An upstanding arm 64 of the bell crank lever is adapted to abut a ainst the inner end of a screw 65 which adjustablv extends throu h the front wall of housing 48.
  • the lever 62 is posi i ned such that the arm 63 forms a limit stop for lever 54 limi n the movement of the latter (clockwise in. Fi 113 ab t its pivotal axis under the urging of lever 56 and spring 58.
  • lever 44 bears against the cam surface 60 n lever 56 nd moves lever 56 angularlv clockwise in Fig. lll to lift the lever arm 57 a ains the ur in of spring 58. This releases the d wnward force exerted by the head 55 on lever 54 and the latter is permitted to move an ularly about its pivota axis (counter-clockwise in. Fig. lll. Such movement of lever 54 permits upward movement of valve plunger 50 under its n rmal sprin bias to close valve 37.
  • valve 33 for con rollin the flow of air to a itator pipe 34 is als c ntrolled 1W the position of hand lever 44-.
  • Valve 33 is controlled bv a plun er 66 which s normally b ased by sprin means (n t shownl ithin the valve to its upper position. in which valve 33 s clo ed.
  • Plunger 66 extends upwardl through the casing of valve 33.
  • a bracket 67 secured to the casing of valve 33 pivotally supports a lever 68, the latter being formed with an upstanding arm 69 and an arm 70 overlying the top of plunger 66.
  • a coil spring 71 urges lever 69 to assume a normal position in which lever arm 70 does not exert a downward force on plunger 66.
  • a cam surface 72 is formed on upstanding lever arm 69 and is normally disposed in alignment with the slot 49 in housing 48 in which manual lever 44 moves.
  • valve 33 is closed at all times except when manual lever 44 is at its extreme left-hand position in Fig. 8.
  • the lever bears against the cam surface 72 to displace lever 68 angularly about its pivotal axis (counter-clockwise in Fig. 13) to overcome the bias of its associated spring 71.
  • the lever arm 44 in this position causes lever arm 70 to exert a downward force on plunger 66 and to maintain the plunger in its down position as long as lever 44 is in this extreme position.
  • valve 73 controlling the flow of water from conduit 26 to the outlet conduit 74.
  • water valve 73 is under the control of a plunger 75 which extends outwardly beyond the valve casing.
  • spring means within valve 73 the plunger 75 is biased toward its outer position to tend to close valve 73 and prevent the flow of water therethrough.
  • this bias on plunger 75 is overcome by a spring-pressed lever arrangement which urges plunger 75 inwardly to maintain valve 73 open at all times except when manual lever 44 is in its extreme right-hand position in Fig. 8.
  • a bracket 76 secured to the casing of valve 73 pivotally supports a lever 77, which has an upwardly extending arm 78 adapted to bear against the outer end of plunger 75 and an arm 79 extending outwardly therefrom and extending across the path of movement of manual lever 44.
  • a coil spring 80 normally urges lever 77 (counter-clockwise about its axis in Fig. 12) to a position in which it abuts against valve plunger 75 and forces the plunger inwardly to permit the fiow of water through valve 73.
  • the adjustable lever arrangement 61-65 already described in connection with air valve 37 (Fig.
  • lever 77 also cooperates with lever 77 to form an adjustable limit stop therefore, with a portion of segment 63b of lever 62 overlying the lever 77 to limit movement thereof counter-clockwise in Fig. 12.
  • the screw 65 determines the position to which valve 73 can be fully opened and thus governs the rate of water flow therethrough.
  • lever 77 Normally spring 80 urges lever 77 to a position forcing plunger 75 inward to open valve 73.
  • manual lever 44 is moved to its extreme right hand position in Fig. 8. In so moving, lever 44 engages and forces downwardly the free end of lever arm 79.
  • Lever 77 therefore moves angularly about its pivotal axis (clockwise in Fig. 12) against the urging of spring 78 to release the inward force on plunger 75. Plunger 75 is thus permitted to assume its extreme outer position to close water valve 73.
  • cylindrical chamber 47 has a greater cross-sectional area than tube 40. so that the air pressure within chamber 47 is less than that in tube 40. Only the relatively finely divided particles of aggregate are carried by the air stream upwardly through chamber 47 and out the discharge conduit 81. Any coarse lumps of aggregate drop to the bottom of chamber 47 where they are exposed to the high pressure air stream from pipe 40 and are broken up thereby. After being broken up these particles are carried by the air stream upwardly through chamber 47 to the discharge outlet 81.
  • the outlet conduit 81 from chamber 47 leads to a swivel connection 82 to which is affixed a hose 83 leading to the discharge gun for the aggregate. Also affixed to conduit 81 is a conduit 84 which at its other end is connected to a coupling 85, which communicates with air conduit 29. Conduit 84 serves as a booster air supply line to assist the flow of aggregate through hose 83.
  • the air supply to coupling 85 also is in communication with a hose 86 which leads to the operators mask, for a purpose which will appear hereinafter.
  • a manually controlled valve 87 is positioned to control the air supply to hose 86.
  • Gage 88 communicates through conduit 89 with the dnve air conduit 38 to indicate the air pressure therein
  • conduit 89 being joined to the drive air conduit 38 at the Outlet side of valve 37.
  • Feed gage r 90 indicates the airpressure within aggregate tank 15 'by way of a conduit .91 whichextends'iinto the aggregate tank and is connected at its upper end with a screen cap 92.
  • the water conduit in the form'of a' flexible hose 74g connected'to conduit 74, terminates at the inlet of -a-'-valve body-93.
  • a valve member-within valve body 93 is controlled by the position of plunger 94 to control the passage of water between base 74;: and a flexible outlet hose 95 at the outlet 'of :valve 93.
  • Handle 98 -is' rotatably mountedfwithin a bushing 98a andat its upper end carries apin' 98b, which '18 positioned eccentrically with respect to the axis of rotationof handle 98.
  • Water hose 95 extends in a loop from the top 'ofyalve .body 93 to an inlet 100 formedin a coupling l01. 'Another inlet to coupling 101 receives the flow aggregate :from hose 83.
  • hose 8 3 is connected to coupling 101 by .a swivel connection, so that to eliminate a Ztwistlor kink in hose 83 the entire gunassembly does not 113N610 :be manipulated.
  • a flexible'hose 102 is connected to the outlet of coupling 101 and serves to mix the -respective streams of yvater and aggregate. The mixed water and aggregate are then sprayed from the outlet nozzle of hose 102 onto the surface to be coated.
  • the shape of discharge .hose 102 determines the texture of the sprayed coating. Fora coarse textured coating hose 102 should .he'straight. 'For a tine textured coatin'g hose #102 should be looped to insurea more intimate ,rnixture of the water and aggregate.
  • An upstanding bracket member 103 rigidly interconnects the bushing 98a, valve body 93 and coupling 101.
  • a standard104 rigidly connected to bracket 103 and extending thereabove supports a lamp 105 anda microphone 106.
  • An electrical ,cable 106a for the microphone and the lamp extends along the unitary hose assembly 107 from the truck to the gun. The lamp 104 assists the operator in seeing the surface to be coated, while the microphone permits instantaneous communication between the operator of the spray gun and the assistant at the truck.
  • the operator wears protective clothing, including a face mask to prevent his breathing in the 'dust and spray from the gun.
  • the air hose 86 is connected to a coupling 108, to which is also connecteda flexible ho'se 109 leading to a nose mask 110 Worn by the operator (Fig. 4).
  • a regulator valve .within'coupling 108 is controlled manually by knob 111 to regulate the air pressure in hose 109.
  • a portion of hose 109 is physically supported by the belt of a harness 112 worn by the operator.
  • This 'air supply to mask 110 assures the operator an adequate supply of fresh air for breathing, and, by exerting a positive air pressure from within the mask, prevents the entry .of dust ,or other particles into the mask.
  • the unitary hose assembly. 107 includes the aggregate hose 83, water hose 74a, air hose 86 and electrical con- When coating interiorwalls, such as 'basementwalls, it is preferable to locate an exhaust fan; indicated at 113 in Fig. 1, in one of the windowsto exhaust the dust from the roomheing sprayed.
  • the truck carries all of the components thereof to the siteof the spray peration.
  • the air compressor 13, airstorage-tank 12, water :tank 14, aggregate tank 15, and the control valve assembly Within housing 48 are alljsuppqrted by the truck name 11.
  • 'The air,,vvater'a nd cement heses'lead- 'ing to the spray gun areconven'iently looped "around initiation .or a stream of .air through tzbraekets 1 14,4135 whichyproject outwardly frgm tank 15; "The spray (gun, operators h'arness, -air-inask, protective clothing, and the exhaust fan 113 are alsojcarried on the truck.
  • An air release valve 116 is provided at the top of'the aggregate gtankand may be manuallyopened -to release the air under pressure therein after the spraying job 'ghas been completed.
  • control lever 44 is in the-extreme right-hand position Fig.”-8 -so-that there is .no' :air :supplied to the feed-air conduit 84,within the aggregatertank,:no:air'supplied to the drive air.con duit 73'8, mo cement :aggregate 'beeing supplied to hose @8'3, and :no waterv supplied *to hose 74a.
  • the aggregate at the bottom of tank 1'5 is in the formof finely divided sand-and cement because of the agitating action of the air jets emerging 'from the holes .35, vso vthat a finely :divided dry :rnixture enters ,tube 40.
  • the drive air stream from conduit 38 -pushes the aggregate streama'long tube 40, upwardi-in c'hamber .47, into hose 83.
  • a booster air stream 'from hose 84 provides additional pneumatic pressure to sustain the How ,of aggregate through the hose 83.
  • Air is supplied through hose 86 to the .operators :face mask to protect him irom dust resulting firorn thespray operation. i
  • a unitary transportable assembly comprising an air compressor, a compressed air storage tank, a water tank, condu it means connecting said air storage tank to the top of said water tank to pressurize the water therein, a tank containing an aggregate of dry cement, pneumatic means for effecting the flow of material from said aggregate tank, valve means controlling the flow of air from said air compressor tank to said pneumatic means, valve means controlling the flow of water from said water tank to an outlet hose, and valve means controlling the flow of dry lcgement aggregate from said aggregate tank to an outlet ose.
  • a unitary transportable assembly comprising an air compressor, an air storage tank, a water tank, a tank containing an aggregate of dry cement, valve means controlling the flow of dry cement aggregate from said aggregate tank to an outlet hose, valve means controlling the flow of compressed air from said air tank to said outlet hose, valve means controlling the flow of water to another outlet hose, and a single control lever operative to control each said valve means.
  • a compressed air conduit controlling the flow of air through said conduit, a tank containing an aggregate of dry cement, a valve operative when open to permit the flow of dry cement aggregate out of said tank, means operative when said last-mentioned valve is open to effect a flow of dry cement aggregate out of said tank into said flowing stream of compressed air, and a single movable control means operative to open the valve for the air conduit and the valve controlling the flow of dry cement aggregate out of the tank.
  • a compressed air conduit controlling the flow of air through said conduit
  • a tank containing an aggregate of dry cement
  • a valve communicating with said tank and operative when open to permit the flow of dry cement aggregate out of said tank
  • a water conduit a valve controlling the flow of water through said water conduit
  • means operative when said valve communicating with the aggregate tank is open to effect a flow of dry cement aggregate out of said tank in response to the flow of compressed air through its conduit, and a single unitary control means operative to open the valve communicating with the aggregate tank and the air and water valves.
  • a tank containing an aggregate of dry cement a first tube fixedly positioned in said tank and formed with a longitudinal slot along its bottom, a second tube snugly rotatably mounted about said first tube contiguous therewith and formed with a longitudinal slot aligned with the longitudinal slot in the first tube at a predetermined angular position of the second tube, said first tube when the respective slots therein are so aligned communicating with the interior of said tank, an outlet conduit connected to said first tube, and means for effecting a flow of compressed air in said tank upwardly toward said tubes to force aggregate from said tank into said first tube for passage to said outlet conduit when said slots are so aligned.
  • a storage a first conduit of predetermined cross-section communicating with said tank, means for effecting a flow of dry cement aggregate and compressed air through said first conduit, a device for breaking lumps in the dry cement aggregate flowing through said first conduit comprising a chamber attached at the discharge end of said first conduit and extending upwardly and transversely thereof to provide a chamber wall opposite the discharge end of said first conduit for impingement thereagainst of aggregate entering the chamber, said chamber having a larger cross-sectional area than said conduit to reduce the velocity of the air-aggregate stream flowing therethrough from said first conduit, and
  • a discharge conduit communicating with said chamber .therethrough, a valve and connected thereto at a point disposed above the connection of said first conduit thereto for conveying the stream of air and aggregate from the chamber.
  • Apparatus for applying a cement coating which comprises a tank containing an aggregate of dry cement, a valve communicating with said tank and operative when open to permit the flow of dry cement aggregate out of said tank, means for discharging compressed air within said tank to force said aggregate through said aggregate valve when the latter is open, a valve controlling said compressed air discharge, an outlet conduit for said cement aggregate connected to said aggregate valve, means for effecting a flowing stream of compressed air through said outlet conduit to move said aggregate controlling said air stream, means for effecting a flow of water through another conduit, a valve controlling said water stream, and a single lever operable in one direction to sequentially open said water valve, said air stream valve, said aggregate valve and said compressed air discharge valve and operable in the other direction to sequentially close said valves in the inverse order in which they were opened.
  • Apparatus as in claim 7 further characterized by means for adjusting said air stream valve and said water valve to control the respective flows therethrough rela* tive to the flow of compressed air through said compressed air discharge valve into the aggregate tank.
  • Apparatus for applying a cement coating which comprises a source of dry cement aggregate, an aggregate hose, means for effecting a flow of air through said hose, means for directing air under pressure in the form of a plurality of jets against said aggregate to thoroughly mix the aggregate and push it into said flowing air stream which passes through the aggregate hose, a water hose, means for effecting a flowing stream of water through said water hose, means for introducing said stream of water into said flowing stream of dry cement aggregate, and means for spraying the resultant stream of wet cement onto the surface to be coated.
  • a tubular member disposed horizontally in said tank above the bottom thereof, said member having an inlet opening in the lower portion thereof and an outlet opening on one endthereof, a perforate conduit disposed in said tank below the member, means for supplying air to said perforate conduit to thereby feed aggregate to said inlet opening, and conduit means extending into said tubular member for directing a stream of air longitudinally of said member towards the outlet opening therein to thereby induce the fiow of material through said member.
  • the combination of claim 10 including a vertical chamber having a cross-sectional area greater than said tubular member, said member at the outlet end thereof communicating with the lower end of said chamber, and a discharge conduit communicating with the upper end of said chamber.
  • a tank adapted to receive an aggregate of dry cement, a tubular member disposed horizontally in said tank above the bottom thereof, said member having an inlet opening in the lower portion thereof and an outlet opening in one end thereof, a U-shaped perforate conduit disposed in said tank below said member with the legs of said U-shaped conduit paralleling said member, means for applying air under pressure to said conduit to agitate the aggregate in the tank and feed aggregate to said inlet opening, an eductor conduit extending into said tubular member for directing a stream of air longitudinally thereof towards the outlet opening therein, and means for supplying pressurized air to said eductor conduit to drive the material through said member.
  • a tank adapted to receive dry cement aggregate, a tubular member disposed horizontally in said tank above the bottom thereof and having one end extending through said tank, said tubular member having an opening in.
  • a U-shaped perforate conduit disposed in said tank below said member, the legs of said U-shaped conduit extending outwardly of said tank, a closure plug removably mounted on one of the outwardly extending legs of said conduit, means for applying air under pressure to one of the legs of said conduit to cause air to flow through the perforations therein and feed aggregate to said member, and means for effecting the fiow of aggregate through said member.
  • a tank adapted to contain an aggregate of dry cement, a tubular member in said tank above the bottom thereof and having one end extending outwardly of said tank, said tubular member having an opening therein, a drive air conduit having one end extending into said tubular member to direct a stream of air longitudinally thereof towards the outwardly extending end of said member, valve means on the other end of said drive air conduit for controlling the flow of air therethrough, a feed air conduit in said tank below said member and having a plurality of apertures therein, and valve means external of said tank for controlling the flow of air to said feed air conduit.
  • a tank adapted to contain an aggregate of dry cement, a tubular member in said tank above the bottom thereof and having one end extending outwardly of said tank, said tubular member having an opening therein, a drive air conduit having one end extending into said tubular member to direct a stream of air longitudinally thereof towards the outwardly extending end of said member, valve means on the other end of said drive air conduit for controlling the flow of air therethrough, a feed air conduit in said tank below said member and having a plurality of apertures therein, valve means external of said tank for controlling the flow of air to said feed air conduit, and a single control lever operable in one direction to sequentially open said drive air valve means and said feed air valve means and operable in the opposite direction to close the valves in the inverse order of opening thereof.
  • control lever is pivotally mounted on the outwardly extending end of said tubular member.

Description

Jan. 25, 1955 R. .1. HARRINGTON ET AL 2,700,535
APPARATUS FOR APPLYING'A CEMENTCOATING Filed June 29, 1951 4 Sheets-Sheet l fans wen awm flffarneys 1955 R. J. HARRINGTON ETAL 2,700,535
APPARATUS FOR APPLYING A CEMENT COATING 4 Sheets-Sheet 2 Filed June 29, 1951 m f w e m 1 Jan. 25, 1955 R. J. HARRINGTON EIAL 2,700,535
APPARATUS 0P APPLYING A CEMENT COATING 4 Sheets-Sheet 3 Filed June 29, 1951 lnz'enfa s MM 6? flff'orneys' 1955 R. .1. HARRINGTON ETAL 2,700,535
APPARATUS FOR APPLYING A CEMENT COATING Filed June 29, 1951 4 Sheets-Sheet 4 A A A A A A A IA A l? 5 73 39 35 4'7 3/ ,3 3 42 40 I I J- --L A\ 63 30 I: 11 .j a5
65 A 4 63a 37 l 36 O I [2+ 636 +2 1 I I I l 1 I n 1 I United States Patent C) -APPARATUS FOR APPLYING A CEMENT COATING .Russell J. Harrington and Richard P. Harrington, Rockford, Ill.
-Application-June $29, 1951, Serial No. 234,338
.20.Claims. (Cl. 259-451) apparatus for applying automatically mix the cement stream and a stream of .water in desired proportions, and to apply the wetcement mixture by pneumatic pressure onto the surface desired to bencoated.
- It is alsoan object .of this invention to spray a wet mixture of cementonto the surface desired to' be coated by means adjustable to control the proportions of the ingredients and the texture of the coating. Another object of this invention is to provide a spray .gun for, mixing water and dry cement and for discharging the resulting wet mixture, and-operated-without undue :strain on the operator.
A further object of this invention is to provide a unitary controlmeans for controlling the flow of dry cement aggregate and the-flow of water to the spray gun.
means for insuring. a smooth and even flow of" finely divided dry cement aggregate to thespraygun.
Other? and further objects and advantages of the invention will become :apparent from a consideration of which may' 'be' manually held A still further-ob ect'of this invention is toprovide the following description of a preferredembodiment thereof. 1n the-drawings:
Figure l is aperspective .view showing the operator applying a cement coating-in accordance with thepresent invention and showing the-transportable: assembly of the i cement, air'and water sources, and controls therefor, employed in the present invention.
. Fig. ,2 is aperspective'viewof the-spray gun for applying the wet spraycoating of cement, including the mixing valve for mixing the streams of dry cement-and water at the 'dischargeanozzle.
'.Fig. 3 isanother-pcrspective view of the spray gun, taken from the opposite side from the view :of-zFig. 2. Fig. 4 illustrates theharness and --breathingmask worn by the --operator.
Fig. 5 is a front view, with certainof the-parts omitted for -clearness, of the :transportable assembly of dry cement, air and water'sources, accordingto the present invention. Fig. 6 is a rear View of the assembly'of Fig. 5.
Fig. 7 is an end view'of the assembly'of'Figs. 5 and 6.
Fig. 8 is a section illustrating the conduits,'valves and control mechanism 'which'govern the supply of dry cement aggregate, air'and water from the unitary. transportable assembly thereof.
Fig. 9 is a vertical section transversely .alon'g the middle of Fig. 8, viewing toward the left .therein, illustrating particularly the valve controlling the flow of dry aggregate to the discharge nozzle.
I, .Fig. 10 is a top vview in section of the Fig. 9 structure.
Fig. 1-1 isa section along theline -1111.of Fig-l 10 illustrating the mechanism controlling a valve whichcontrols, the flow of air into.v thecement valve.
l2. is -a section zalong. the line IZ-12 ofFig. 10
' explained hereinafter.
2 illustrating the mechanism controlling a'valve which controls the flow of water to the discharge nozzle. v
Fig. 13 is a's'ection along the line 1-3-13 of Fig. 10 illustrating the mechanism controlling a valve which controls the flowof'agitating air into the tank 'ofa'ggregate.
Fig. '14 is a section along the line 1414 of Fig. v10 illustrating the'positions in the aggregate tank of the cement valve and of the'conduit for dischargingagitating air into the tank.
'In accordance with the presentinvention, a'tru'ck 10 is provided with a rearwardly extending frame :11 adapted to support the components of the invention, so that the entire'assembly is readily transportable to andfrom the job. An air storage tank '12 is connected to receive and contain air under pressure from an air compressor 13. 'A- water tank14 is also supported by the-truck frame, as is an-upright cylindricaltank 15 which contains an aggregate-of dry sand and cement, to be ultimately mixed with water and the resulting wet mixture sprayed-onto the surface to be coated, in the manner A ladder '16 on the truck frame permits the operator to have ready access to manual shut-off valves "adjacent the :compressed air tankand the-water tank, allof these valves -being grouped above a horizontal platform 17-which extends over the water tank. Access -to the aggregate tank 15 may *be had through a-detachable top closure 18.
One outlet conduit 19' from the air tank-12 is connected to communicate with the aggregate tank, for a purpose which will be apparent hereinafter. A manual shut-ofi valve-20'controls the supply of air to conduit 19. p
Another outlet conduit 21 from air tank 1'2 connects with-a fitting 22 which communicates through pipe 23 to the top of the water tank. Thus, a portion of'the compressed air from-tank 12 is used to keep the water in tank 14 under pressure and thereby insures the desired water flow therefrom. Manual valve 24 controls the pressurized air supply to the watertank. -The"water flow from tank 14 flows past outlet valve 26. -Valve 25 is a reliase valve for releasing air from the top "of the "water tan Air compressor 13 is provided witha pipe 13acommunicating with an exhaust outlet 13b leading to the atmosphere. Suitable valve means may-be provided for selectively directing this exhaust from the air compressor into-a conduit 14a which extends into thewater tank 14 at the bottom thereof to form aloop therein and terminates in an exhaust pipe 14b communicating with the atmosphere. Inthis-manner, the water within water tank 14 may be heated to avoid freezing thereof during cold weather.
As best seen in Figs. 8 and 10 the air conduit 19 leads from air tank 12 through a swivel connection 19a to a coupling 27 having two outlet conduits,.28 and.29. Conduit 28 in turn connects with another coupling 30 having two outlet conduits, 31 and 32. Conduit 31 leads through valve 33 to a U-shaped horizontal conduit 34which is disposed within the aggregate tank adjacent the bottom thereof. At its inner side conduit 34 is formed-with a plurality of openings 35 through which feed air escapes to exert an upward and centrally directed force against the sand-and cement in tank 15 and to agitate andmix the same. At its other endfeed air tube 34 is provided with a closure cap 36, so that the entire supplyof air to tube 34 is dissipated within the aggregate-tamer Cap 36 is-readily removable from conduit 34 to permit-cleaning out of the latter.
Conduit 32 leads through valve 37 to a drive'air conduit 38 which is open at its free'end. The freeend of eductor conduit 38 is disposed within a tubular assembly,
generally indicated at 39, a portion of which is'disposed within the aggregate'tank 15- near the bottom thereof and above the agitator conduit 34 centrally located with re spect thereto. The tubular assembly 39'includes a fixedly positioned inner tube 40 formed with an elongated slot 41 extending lengthwise along its bottom'portion." An
outer tube 42 is snugly rotatably disposed about tube 40 and is formed with an elongated slot 43 adapted to register with the slot 41in tube 40. When the slots 41 "and 43 are in register'the cement aggregate is permitted to enter from the tank 15 into inner tube 40-and flow therein 3 in the direction of the air stream from drive air conduit 38. Since the slots 41 and 43 must be in register for such flow of the aggregate to take place, it will be seen that the tubular assembly 39 forms a sleeve valve controlling the flow of the aggregate from tank into tube 40.
Disposed at the front of aggregate tank 15 is a lever 44 fixedly secured by a collar 44:: to the outer tube 42 of the sleeve valve and thus adapted by its angular position to control the alignment of the slots 41 and 43. Suitable bearing mountings 45 and 46 support the tube 42 for rotation at the front of the aggregate tank 15. Inner tube 40 also extends through the front of tank 15 and is fixedly connected to an upwardly extending cylindrical chamber 47. A box-like housing 48 surrounds the forward end of tubes 40 and 42, the connection of lever 44 to tube 42, and the lower portion of chamber 47 at its connection to inner tube 40. A peripheral slot 49 is formed in housing 48 to extend around the upper half thereof. Slot 49 extends completely across the top of housing 48 and about half-Way down each side thereof. Lever 44 is positioned to move in this slot as it is rotated about its pivotal axis about tube 40. The shoulders formed by the ends of the slot 49 at the respective sides of housing 48 define the extreme limits of movement of lever 44.
As best seen in Fig. 11, the valve 37 which controls the flow of air to drive air pipe 38 is controlled by a plunger 50 which extends upwardly beyond the casing of valve 37. Plunger 50 is biased upwardly by spring means (not shown) in valve 37 tending to maintain the valve closed and prevent the fiow of air to drive air pipe 38. 'A U-shaped bracket 51 is secured to the valve casing and has two spaced u standing arms 52, 53 extending thereabove. A lever 54 is pivoted on arm 52 and is formed with a head 55 p sitioned to bear against the to of plunger 50. Arm 53 pivotally carries a lever 56 which has one arm 57 extending toward plunger 50 and has its free end positioned to overlie the head portion 55 of lever 54. A coil spring 58 urges the free end of arm '57 downwardly to exert downward force on the head portion 55 of lever 54 and on the valve plunger 50 to open valve 37 and permit the fiow of air to drive air pi e 38. Lever 56 is also formed with an upstanding arm 59 which has a cam surface 60 at its up er end located in ali nment wi h the slot 49 in which lever 44 moves. A bracket 61 affixed to the inner side of the front wall of housing 48 pivotally su ports a bell crank lever 62 hav ing a long arm 63 which has a transverse segment 6341 at its free end overlying the lever 54 at the side of the pivotal axis thereof remote from head 55. An upstanding arm 64 of the bell crank lever is adapted to abut a ainst the inner end of a screw 65 which adjustablv extends throu h the front wall of housing 48. The lever 62 is posi i ned such that the arm 63 forms a limit stop for lever 54 limi n the movement of the latter (clockwise in. Fi 113 ab t its pivotal axis under the urging of lever 56 and spring 58.
Nnrmallv. as shown in Fig. ll. lever 56 bears against the head 55 on lever 54 to maintain valve plunger 50 d wn and keep valve 37 open. Valve 37 is thus maintained en as long as lever 56 is not engaged by manual lever 44 and is thus free to ssume the open position to whi h it is biased b snring 58. The adiustment of scre 65 determines the full open position of valve 37. and thus the amount of air which can be supplied to the drive air c duit when valve 37 is open. o close valve 37. manual er 44 is rotated about its pivotal axis (clockwise in i 8) to assume the extreme ri ht hand position in Fi 8. Tu so moving. lever 44 bears against the cam surface 60 n lever 56 nd moves lever 56 angularlv clockwise in Fig. lll to lift the lever arm 57 a ains the ur in of spring 58. This releases the d wnward force exerted by the head 55 on lever 54 and the latter is permitted to move an ularly about its pivota axis (counter-clockwise in. Fig. lll. Such movement of lever 54 permits upward movement of valve plunger 50 under its n rmal sprin bias to close valve 37.
A best seen in Fi 13. the v lve 33 for con rollin the flow of air to a itator pipe 34 is als c ntrolled 1W the position of hand lever 44-. Valve 33 is controlled bv a plun er 66 which s normally b ased by sprin means (n t shownl ithin the valve to its upper position. in which valve 33 s clo ed. Plunger 66 extends upwardl through the casing of valve 33. A bracket 67 secured to the casing of valve 33 pivotally supports a lever 68, the latter being formed with an upstanding arm 69 and an arm 70 overlying the top of plunger 66. A coil spring 71 urges lever 69 to assume a normal position in which lever arm 70 does not exert a downward force on plunger 66. A cam surface 72 is formed on upstanding lever arm 69 and is normally disposed in alignment with the slot 49 in housing 48 in which manual lever 44 moves.
With this construction it will be apparent that valve 33 is closed at all times except when manual lever 44 is at its extreme left-hand position in Fig. 8. In moving lever 44 to that position to open valve 33, the lever bears against the cam surface 72 to displace lever 68 angularly about its pivotal axis (counter-clockwise in Fig. 13) to overcome the bias of its associated spring 71. The lever arm 44 in this position causes lever arm 70 to exert a downward force on plunger 66 and to maintain the plunger in its down position as long as lever 44 is in this extreme position.
The water conduit 2611 leading from the outlet of valve 26 at water tank 14 extends into housing 48 and is provided with a valve 73 controlling the flow of water from conduit 26 to the outlet conduit 74. As best seen in Fig. 12, water valve 73 is under the control of a plunger 75 which extends outwardly beyond the valve casing. By spring means (not shown) within valve 73 the plunger 75 is biased toward its outer position to tend to close valve 73 and prevent the flow of water therethrough. Normally, however, this bias on plunger 75 is overcome by a spring-pressed lever arrangement which urges plunger 75 inwardly to maintain valve 73 open at all times except when manual lever 44 is in its extreme right-hand position in Fig. 8. A bracket 76 secured to the casing of valve 73 pivotally supports a lever 77, which has an upwardly extending arm 78 adapted to bear against the outer end of plunger 75 and an arm 79 extending outwardly therefrom and extending across the path of movement of manual lever 44. A coil spring 80 normally urges lever 77 (counter-clockwise about its axis in Fig. 12) to a position in which it abuts against valve plunger 75 and forces the plunger inwardly to permit the fiow of water through valve 73. The adjustable lever arrangement 61-65 already described in connection with air valve 37 (Fig. 11) also cooperates with lever 77 to form an adjustable limit stop therefore, with a portion of segment 63b of lever 62 overlying the lever 77 to limit movement thereof counter-clockwise in Fig. 12. In this manner, the screw 65 determines the position to which valve 73 can be fully opened and thus governs the rate of water flow therethrough.
Normally spring 80 urges lever 77 to a position forcing plunger 75 inward to open valve 73. To close valve 73 manual lever 44 is moved to its extreme right hand position in Fig. 8. In so moving, lever 44 engages and forces downwardly the free end of lever arm 79. Lever 77 therefore moves angularly about its pivotal axis (clockwise in Fig. 12) against the urging of spring 78 to release the inward force on plunger 75. Plunger 75 is thus permitted to assume its extreme outer position to close water valve 73.
As shown in the drawings, cylindrical chamber 47 has a greater cross-sectional area than tube 40. so that the air pressure within chamber 47 is less than that in tube 40. Only the relatively finely divided particles of aggregate are carried by the air stream upwardly through chamber 47 and out the discharge conduit 81. Any coarse lumps of aggregate drop to the bottom of chamber 47 where they are exposed to the high pressure air stream from pipe 40 and are broken up thereby. After being broken up these particles are carried by the air stream upwardly through chamber 47 to the discharge outlet 81.
The outlet conduit 81 from chamber 47 leads to a swivel connection 82 to which is affixed a hose 83 leading to the discharge gun for the aggregate. Also affixed to conduit 81 is a conduit 84 which at its other end is connected to a coupling 85, which communicates with air conduit 29. Conduit 84 serves as a booster air supply line to assist the flow of aggregate through hose 83.
The air supply to coupling 85 also is in communication with a hose 86 which leads to the operators mask, for a purpose which will appear hereinafter. A manually controlled valve 87 is positioned to control the air supply to hose 86.
Gage 88 communicates through conduit 89 with the dnve air conduit 38 to indicate the air pressure therein,
8 conduit 89 being joined to the drive air conduit 38 at the Outlet side of valve 37.
Feed gage r 90 indicates the airpressure within aggregate tank 15 'by way of a conduit .91 whichextends'iinto the aggregate tank and is connected at its upper end with a screen cap 92. Screen cap 92 is f=fine mesh construction preventing the entry'of aggregate into conduit 91. "The air pressure within the aggregate tank is,.o f course, due --to the feed .air entering the tank at ports '35, so that gage 90 :is responsive to the feed air -pressure 'in conduit 341 Therefore, the :feed a'ir supply' is regulated in accordance with the reading of gage 90.
At the gun, where the ag regate and water streams are mixed and sprayed onto t e surface-to be coated, the water conduit, in the form'of a' flexible hose 74g connected'to conduit 74, terminates at the inlet of -a-'-valve body-93. A valve member-within valve body 93 is controlled by the position of plunger 94 to control the passage of water between base 74;: and a flexible outlet hose 95 at the outlet 'of :valve 93. Bymeans of ;a rod 96 and a bracket 97 rigidly interconnecting rod 9 6 and valve plunger 94, handle "98 isadapted to control the operation of valve =93. Handle 98 -is'=rotatably mountedfwithin a bushing 98a andat its upper end carries apin' 98b, which '18 positioned eccentrically with respect to the axis of rotationof handle 98. Red 596 carries a ring =96a yvhich surrounds pin 98b. With this arrangement the angular position of handle-98 with respect to bushing98a.controls the position of .pin 98b, which by its engagement -with rod 96 controls -thevalve-within valve jbody- 93.
Water hose 95 extends in a loop from the top 'ofyalve .body 93 to an inlet 100 formedin a coupling l01. 'Another inlet to coupling 101 receives the flow aggregate :from hose 83. Preferably hose 8 3 is connected to coupling 101 by .a swivel connection, so that to eliminate a Ztwistlor kink in hose 83 the entire gunassembly does not 113N610 :be manipulated. A flexible'hose 102 is connected to the outlet of coupling 101 and serves to mix the -respective streams of yvater and aggregate. The mixed water and aggregate are then sprayed from the outlet nozzle of hose 102 onto the surface to be coated. The shape of discharge .hose 102 determines the texture of the sprayed coating. Fora coarse textured coating hose 102 should .he'straight. 'For a tine textured coatin'g hose #102 should be looped to insurea more intimate ,rnixture of the water and aggregate. An upstanding bracket member 103 rigidly interconnects the bushing 98a, valve body 93 and coupling 101. A standard104 rigidly connected to bracket 103 and extending thereabove supports a lamp 105 anda microphone 106. An electrical ,cable 106a for the microphone and the lamp extends along the unitary hose assembly 107 from the truck to the gun. The lamp 104 assists the operator in seeing the surface to be coated, while the microphone permits instantaneous communication between the operator of the spray gun and the assistant at the truck.
As best seen in Fig. 1, the operator wears protective clothing, including a face mask to prevent his breathing in the 'dust and spray from the gun. For this purpose the air hose 86 is connected to a coupling 108, to which is also connecteda flexible ho'se 109 leading to a nose mask 110 Worn by the operator (Fig. 4). A regulator valve .within'coupling 108 is controlled manually by knob 111 to regulate the air pressure in hose 109. A portion of hose 109 is physically supported by the belt of a harness 112 worn by the operator. This 'air supply to mask 110 assures the operator an adequate supply of fresh air for breathing, and, by exerting a positive air pressure from within the mask, prevents the entry .of dust ,or other particles into the mask.
The unitary hose assembly. 107 includes the aggregate hose 83, water hose 74a, air hose 86 and electrical con- When coating interiorwalls, such as 'basementwalls, it is preferable to locate an exhaust fan; indicated at 113 in Fig. 1, in one of the windowsto exhaust the dust from the roomheing sprayed.
In using the present invention, the truck carries all of the components thereof to the siteof the spray peration. The air compressor 13, airstorage-tank 12, water :tank 14, aggregate tank 15, and the control valve assembly Within housing 48 are alljsuppqrted by the truck name 11. 'The air,,vvater'a nd cement heses'lead- 'ing to the spray gun areconven'iently looped "around initiation .or a stream of .air through tzbraekets 1 14,4135 whichyproject outwardly frgm tank 15; "The spray (gun, operators h'arness, -air-inask, protective clothing, and the exhaust fan 113 are alsojcarried on the truck. Theentire supply=of-waterand-cement iused'at the ."job arecarried within the respective tanks.
.An air release valve 116 is provided at the top of'the aggregate gtankand may be manuallyopened -to release the air under pressure therein after the spraying job 'ghas been completed.
,Except whensthespray-gun is to be operated,control lever 44 is in the-extreme right-hand position Fig."-8 -so-that there is .no' :air :supplied to the feed-air conduit 84,within the aggregatertank,:no:air'supplied to the drive air.con duit 73'8, mo cement :aggregate 'beeing supplied to hose @8'3, and :no waterv supplied *to hose 74a.
T0 condition the system .-'for operation of -the spray gun .the :lever .144 ris moved away from I its extreme righthand position in Fig. r8. As the lever moves out of engagement :withilever 56, valve 37 opens --fully-'to-supply .air to the drive air.conduit 38. When valveinitially .opens, .the sleeve valve 3 9;controlling:the entryiof cement aggregate into the hose 83 is still closed, as are the respective :valves 63 and .73 controlling the supply of air :-to the feed air :conduit 34 and :the water hose 7411. "Thus, the only result of initial opening movement of :lever .44 is to direct. a streamI-of air into pipe 40 and thence to zhose 83.
.As 'lever .44.tmoves away from its extreme right-hand :position .in Fig. '8 .it releases lever-'77 and :permits'valve ,to .open .and supply .waterto water :hose 74a.
Astangular movement of lever .44 is continued (counterclockwise in Fig. 8) the outer tube 42 rotates about tube \40.; so' that slot .43 approaches alignment with -slot A1, o that sleeve valve 39 gradually is opened. The 'fact thatopening of the sleeve :valve -'is preceded by the tube 40 from drive air conduit 38, and the gradualopening of sleeve -valve 39, \prevent clogging :of the aggregate ;'hose with cement.
:When thezlever A4 reaches :its extreme -left hand posi- .,tion;in Fig. 8, .it.-engages lever 68at 72;.andopens-valve ;33 gradually to .supplyair to feed air conduit 3'4. This zfiir supply escapes through holes'35 'to discharge a plurality of upwardly and' inwardly directed air jets into therbqttom of tank .15. These air jets act against the aggregate in the bottom of tank :15 and 'force it into the .elongated hole in sleeve valve 39, WhQSC slots 41 and Aaare fully in register as lever.'44'contacts the lever por- .tion :72. "The aggregate at the bottom of tank 1'5 is in the formof finely divided sand-and cement because of the agitating action of the air jets emerging 'from the holes .35, vso vthat a finely :divided dry :rnixture enters ,tube 40. The drive air stream from conduit 38-pushes the aggregate streama'long tube 40, upwardi-in c'hamber .47, into hose 83. A booster air stream 'from hose 84 provides additional pneumatic pressure to sustain the How ,of aggregate through the hose 83.
j At-the spray gun the =water stream in'hose 74a ismixed into the stream of dry aggregate from :hose 83,-;under the contro'i of the mixing valve 93 operated by 'hand le The operator holds handle 98 with one hand and =with his other hand controls the shape and direction of discharge hose )102 :to direct .thewet mixture onto the surface "being coated. Because of the .even how of dry aggregate through hose .83 and because of .the convenient arrangement of the spray gun assembly the gun operators strengthis not taxed in the operation of the :present gmvention.
Air is supplied through hose 86 to the .operators :face mask to protect him irom dust resulting firorn thespray operation. i
To adjust the relative proportions .of Water in hose 744 an drive air in conduit 38 'yvithrespect ztQ'ifeed air in conduit ;34 the screw 65 .may be adjusted intor out, he eby vary g t a r an d e i flows in thetull ,open position of their respective ,valves. This adjustment insure smc h flow p e y a g g te throu hihese $3 and ,a more accurately controlled mixing of water andaggregate at the spray gun.
"Upon completion of the "spraying job, the lever 44 is moved in the opposite direction (clockwise infFig. 8) to ts extreme ight-ha p o This a ion closes valve ,33 to shu off th e irsupplY to condui .3 9 05.65 s eev va e 3. to. p v n th l the fl -d r ag egate out at t nk .1 c oses va ve .73 toshut on the Water su ply o 1. 9 44; andfina y closes" valve 137 to shut bit the drive air suppiy'to conduit 38. The release tank adapted for dry cement aggregate,
'7 valve 116 for the aggregate tank is opened manually gust before lever 44 has reached its extreme right-hand position.
While there has been described herein a specific embodiment of the invention it is to be understood that various modifications and variations of the described form may be resorted to without departing from the spirit and scope of the invention.
We claim:
1. In apparatus for applying a cement coating, a unitary transportable assembly comprising an air compressor, a compressed air storage tank, a water tank, condu it means connecting said air storage tank to the top of said water tank to pressurize the water therein, a tank containing an aggregate of dry cement, pneumatic means for effecting the flow of material from said aggregate tank, valve means controlling the flow of air from said air compressor tank to said pneumatic means, valve means controlling the flow of water from said water tank to an outlet hose, and valve means controlling the flow of dry lcgement aggregate from said aggregate tank to an outlet ose.
2. In apparatus for applying a cement coating, a unitary transportable assembly comprising an air compressor, an air storage tank, a water tank, a tank containing an aggregate of dry cement, valve means controlling the flow of dry cement aggregate from said aggregate tank to an outlet hose, valve means controlling the flow of compressed air from said air tank to said outlet hose, valve means controlling the flow of water to another outlet hose, and a single control lever operative to control each said valve means.
3. In apparatus for applying a cement coating, in combination, a compressed air conduit, a valve controlling the flow of air through said conduit, a tank containing an aggregate of dry cement, a valve operative when open to permit the flow of dry cement aggregate out of said tank, means operative when said last-mentioned valve is open to effect a flow of dry cement aggregate out of said tank into said flowing stream of compressed air, and a single movable control means operative to open the valve for the air conduit and the valve controlling the flow of dry cement aggregate out of the tank.
4. In apparatus for applying a cement coating, in combination, a compressed air conduit, a valve controlling the flow of air through said conduit, a tank containing an aggregate of dry cement, a valve communicating with said tank and operative when open to permit the flow of dry cement aggregate out of said tank, a water conduit, a valve controlling the flow of water through said water conduit, means operative when said valve communicating with the aggregate tank is open to effect a flow of dry cement aggregate out of said tank in response to the flow of compressed air through its conduit, and a single unitary control means operative to open the valve communicating with the aggregate tank and the air and water valves.
5. In apparatus for applying a cement coating, a tank containing an aggregate of dry cement, a first tube fixedly positioned in said tank and formed with a longitudinal slot along its bottom, a second tube snugly rotatably mounted about said first tube contiguous therewith and formed with a longitudinal slot aligned with the longitudinal slot in the first tube at a predetermined angular position of the second tube, said first tube when the respective slots therein are so aligned communicating with the interior of said tank, an outlet conduit connected to said first tube, and means for effecting a flow of compressed air in said tank upwardly toward said tubes to force aggregate from said tank into said first tube for passage to said outlet conduit when said slots are so aligned.
6. In apparatus for applying a cement coating, a storage a first conduit of predetermined cross-section communicating with said tank, means for effecting a flow of dry cement aggregate and compressed air through said first conduit, a device for breaking lumps in the dry cement aggregate flowing through said first conduit comprising a chamber attached at the discharge end of said first conduit and extending upwardly and transversely thereof to provide a chamber wall opposite the discharge end of said first conduit for impingement thereagainst of aggregate entering the chamber, said chamber having a larger cross-sectional area than said conduit to reduce the velocity of the air-aggregate stream flowing therethrough from said first conduit, and
a discharge conduit communicating with said chamber .therethrough, a valve and connected thereto at a point disposed above the connection of said first conduit thereto for conveying the stream of air and aggregate from the chamber.
7. Apparatus for applying a cement coating which comprises a tank containing an aggregate of dry cement, a valve communicating with said tank and operative when open to permit the flow of dry cement aggregate out of said tank, means for discharging compressed air within said tank to force said aggregate through said aggregate valve when the latter is open, a valve controlling said compressed air discharge, an outlet conduit for said cement aggregate connected to said aggregate valve, means for effecting a flowing stream of compressed air through said outlet conduit to move said aggregate controlling said air stream, means for effecting a flow of water through another conduit, a valve controlling said water stream, and a single lever operable in one direction to sequentially open said water valve, said air stream valve, said aggregate valve and said compressed air discharge valve and operable in the other direction to sequentially close said valves in the inverse order in which they were opened.
8. Apparatus as in claim 7 further characterized by means for adjusting said air stream valve and said water valve to control the respective flows therethrough rela* tive to the flow of compressed air through said compressed air discharge valve into the aggregate tank.
9. Apparatus for applying a cement coating which comprises a source of dry cement aggregate, an aggregate hose, means for effecting a flow of air through said hose, means for directing air under pressure in the form of a plurality of jets against said aggregate to thoroughly mix the aggregate and push it into said flowing air stream which passes through the aggregate hose, a water hose, means for effecting a flowing stream of water through said water hose, means for introducing said stream of water into said flowing stream of dry cement aggregate, and means for spraying the resultant stream of wet cement onto the surface to be coated.
10. In an apparatus for applying a cement coating,
-a tank adapted to contain an aggregate of dry cement,
a tubular member disposed horizontally in said tank above the bottom thereof, said member having an inlet opening in the lower portion thereof and an outlet opening on one endthereof, a perforate conduit disposed in said tank below the member, means for supplying air to said perforate conduit to thereby feed aggregate to said inlet opening, and conduit means extending into said tubular member for directing a stream of air longitudinally of said member towards the outlet opening therein to thereby induce the fiow of material through said member.
11. The combination of claim 10 including a vertical chamber having a cross-sectional area greater than said tubular member, said member at the outlet end thereof communicating with the lower end of said chamber, and a discharge conduit communicating with the upper end of said chamber.
12. The combination of claim 11 including means connected to said discharge conduit adjacent said cham' her for directing a stream of air into said discharge conduit to aid the flow of aggregate therethrough.
13. In an apparatus for applying a cement coating, a tank adapted to receive an aggregate of dry cement, a tubular member disposed horizontally in said tank above the bottom thereof, said member having an inlet opening in the lower portion thereof and an outlet opening in one end thereof, a U-shaped perforate conduit disposed in said tank below said member with the legs of said U-shaped conduit paralleling said member, means for applying air under pressure to said conduit to agitate the aggregate in the tank and feed aggregate to said inlet opening, an eductor conduit extending into said tubular member for directing a stream of air longitudinally thereof towards the outlet opening therein, and means for supplying pressurized air to said eductor conduit to drive the material through said member.
14. The combination of claim 13 wherein said opening in said tubular member comprises a slot extending longitudinally thereof.
15. In an apparatus for applying a cement coating, a tank adapted to receive dry cement aggregate, a tubular member disposed horizontally in said tank above the bottom thereof and having one end extending through said tank, said tubular member having an opening in.
the lower portion thereof, a U-shaped perforate conduit disposed in said tank below said member, the legs of said U-shaped conduit extending outwardly of said tank, a closure plug removably mounted on one of the outwardly extending legs of said conduit, means for applying air under pressure to one of the legs of said conduit to cause air to flow through the perforations therein and feed aggregate to said member, and means for effecting the fiow of aggregate through said member.
16. In an apparatus for applying a cement coating, a tank adapted to contain an aggregate of dry cement, a tubular member in said tank above the bottom thereof and having one end extending outwardly of said tank, said tubular member having an opening therein, a drive air conduit having one end extending into said tubular member to direct a stream of air longitudinally thereof towards the outwardly extending end of said member, valve means on the other end of said drive air conduit for controlling the flow of air therethrough, a feed air conduit in said tank below said member and having a plurality of apertures therein, and valve means external of said tank for controlling the flow of air to said feed air conduit.
17. In an apparatus for applying a cement coating, a tank adapted to contain an aggregate of dry cement, a tubular member in said tank above the bottom thereof and having one end extending outwardly of said tank, said tubular member having an opening therein, a drive air conduit having one end extending into said tubular member to direct a stream of air longitudinally thereof towards the outwardly extending end of said member, valve means on the other end of said drive air conduit for controlling the flow of air therethrough, a feed air conduit in said tank below said member and having a plurality of apertures therein, valve means external of said tank for controlling the flow of air to said feed air conduit, and a single control lever operable in one direction to sequentially open said drive air valve means and said feed air valve means and operable in the opposite direction to close the valves in the inverse order of opening thereof.
18. The combination of claim 17 wherein said control lever is pivotally mounted on the outwardly extending end of said tubular member.
19. The combination of claim 17 including a sleeve mounted on said tubular member and having an opening therein adapted to register with the opening in said tubular member in a predetermined angular position of said sleeve, said lever being mounted on said sleeve to rotate said sleeve in response to operation of said lever to open and close said valve means.
20. The combination of claim 17 including cam means engageable by said lever for controllably opening said feed air valve means in accordance with the position of said lever, and means for independently adjusting the flow through said drive air valve means when the latter is opened by said lever.
References Cited in the file of this patent UNITED STATES PATENTS 998,762 Faller July 25, 1911 2,261,441 Layne Nov. 4, 1941 2,495,540 Nichols Jan. 24, 1950 2,543,517 Anderson Feb. 27, 1951 2,577,664 Pro Dec. 4, 1951 FOREIGN PATENTS 614,282 Germany June 5, 1935
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US3035940A (en) * 1960-02-04 1962-05-22 Plastering Dev Ct Inc Method of applying plaster
US3107901A (en) * 1959-08-03 1963-10-22 Harold M Zimmerman Pre-mixed concrete system
US3114536A (en) * 1958-11-26 1963-12-17 Quigley Co Furnace repair gun
US3518330A (en) * 1965-01-07 1970-06-30 Quigley Co Method for prolonging the life of the cone section of the refractory lining of a basic oxygen furnace of the kaldo type
US3622130A (en) * 1970-09-18 1971-11-23 Arvid W Malm Apparatus for handling and spraying coating material
US3799440A (en) * 1972-03-02 1974-03-26 American Aero Ind Safety apparatus
US4892410A (en) * 1986-06-16 1990-01-09 Sandoz Ltd. Method and apparatus for protective encapsulation of structural members
US5597120A (en) * 1994-06-17 1997-01-28 Blue Oaks Materials Limited Partnership Method and apparatus for mixing, spraying and placing cementitious materials
US6394088B1 (en) * 1998-11-06 2002-05-28 Mark R. Frye Oxygen-delivery system with portable oxygen meter
US20130008536A1 (en) * 2010-03-18 2013-01-10 Wrobel Steve J Adjusting pump flow at tool
US20160326052A1 (en) * 2015-05-06 2016-11-10 En-Tech Corporation System and method for making and applying a non-portland cement-based material
CN110662725A (en) * 2016-11-04 2020-01-07 恩科技公司 System and method for making and applying non-portland cement-based materials
US10865146B2 (en) 2015-05-06 2020-12-15 En-Tech Corporation System and method for making and applying a non-Portland cement-based material
US11766807B2 (en) * 2017-01-15 2023-09-26 Michael George BUTLER Apparatuses and systems for and methods of generating and placing zero-slump-pumpable concrete

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US998762A (en) * 1911-05-19 1911-07-25 Cement Appliances Company Apparatus for combining comminuted solids and liquid.
DE614282C (en) * 1933-02-14 1935-06-05 Albert Pares Moertelbehaelter with a feed nozzle to be fed by compressed air
US2261441A (en) * 1939-02-04 1941-11-04 Leslie A Layne Cementing machine
US2495540A (en) * 1944-05-29 1950-01-24 Illinois Clay Products Co Method of coating with lightweight aggregates
US2543517A (en) * 1947-06-09 1951-02-27 Jo Zach Miller Iii Apparatus for combining and emplacing cementitious substances
US2577664A (en) * 1950-03-20 1951-12-04 Jo Zach Miller Discharge nozzle for hydrating cementitious substances under pressure

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Publication number Priority date Publication date Assignee Title
US998762A (en) * 1911-05-19 1911-07-25 Cement Appliances Company Apparatus for combining comminuted solids and liquid.
DE614282C (en) * 1933-02-14 1935-06-05 Albert Pares Moertelbehaelter with a feed nozzle to be fed by compressed air
US2261441A (en) * 1939-02-04 1941-11-04 Leslie A Layne Cementing machine
US2495540A (en) * 1944-05-29 1950-01-24 Illinois Clay Products Co Method of coating with lightweight aggregates
US2543517A (en) * 1947-06-09 1951-02-27 Jo Zach Miller Iii Apparatus for combining and emplacing cementitious substances
US2577664A (en) * 1950-03-20 1951-12-04 Jo Zach Miller Discharge nozzle for hydrating cementitious substances under pressure

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114536A (en) * 1958-11-26 1963-12-17 Quigley Co Furnace repair gun
US3107901A (en) * 1959-08-03 1963-10-22 Harold M Zimmerman Pre-mixed concrete system
US3035940A (en) * 1960-02-04 1962-05-22 Plastering Dev Ct Inc Method of applying plaster
US3013695A (en) * 1960-10-12 1961-12-19 Jr Europe A Caldwell Spreading method and apparatus
US3518330A (en) * 1965-01-07 1970-06-30 Quigley Co Method for prolonging the life of the cone section of the refractory lining of a basic oxygen furnace of the kaldo type
US3622130A (en) * 1970-09-18 1971-11-23 Arvid W Malm Apparatus for handling and spraying coating material
US3799440A (en) * 1972-03-02 1974-03-26 American Aero Ind Safety apparatus
US4892410A (en) * 1986-06-16 1990-01-09 Sandoz Ltd. Method and apparatus for protective encapsulation of structural members
US5597120A (en) * 1994-06-17 1997-01-28 Blue Oaks Materials Limited Partnership Method and apparatus for mixing, spraying and placing cementitious materials
US6394088B1 (en) * 1998-11-06 2002-05-28 Mark R. Frye Oxygen-delivery system with portable oxygen meter
US20130008536A1 (en) * 2010-03-18 2013-01-10 Wrobel Steve J Adjusting pump flow at tool
US9481000B2 (en) * 2010-03-18 2016-11-01 Graco Minnesota Inc. Adjusting pump flow at tool
US20160326052A1 (en) * 2015-05-06 2016-11-10 En-Tech Corporation System and method for making and applying a non-portland cement-based material
US11008253B2 (en) 2015-05-06 2021-05-18 En-Tech Corporation System and method for making and applying a non-Portland cement-based material
CN108025970A (en) * 2015-05-06 2018-05-11 恩科技公司 System and method for manufacturing and using non-silicate cement-based material
US11745215B2 (en) * 2015-05-06 2023-09-05 En-Tech Corporation System and method for making and applying a non-Portland-cement-based material
TWI708670B (en) * 2015-05-06 2020-11-01 美商En科技股份有限公司 Method for applying a construction material
US10865146B2 (en) 2015-05-06 2020-12-15 En-Tech Corporation System and method for making and applying a non-Portland cement-based material
US10882786B2 (en) 2015-05-06 2021-01-05 En-Tech Corporation System and method for making and applying a non-portland cement-based material
US9896379B2 (en) * 2015-05-06 2018-02-20 En-Tech Corporation System and method for making and applying a non-portland cement-based material
US20210230061A1 (en) * 2015-05-06 2021-07-29 En-Tech Corporation System and Method for Making and Applying a Non-Portland-Cement-Based Material
US11219920B2 (en) 2015-05-06 2022-01-11 En-Tech Corporation System and method for making and applying a non-portland cement-based material
US11224894B2 (en) 2015-05-06 2022-01-18 En-Tech Corporation System and method for making and applying a non-Portland cement-based material
US11351698B2 (en) 2015-05-06 2022-06-07 En-Tech Corporation System and method for making and applying a non-Portland cement-based material
CN115108802A (en) * 2015-05-06 2022-09-27 恩科技公司 System and method for manufacturing and applying non-portland cement-based materials
CN110662725A (en) * 2016-11-04 2020-01-07 恩科技公司 System and method for making and applying non-portland cement-based materials
US11766807B2 (en) * 2017-01-15 2023-09-26 Michael George BUTLER Apparatuses and systems for and methods of generating and placing zero-slump-pumpable concrete

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