US2619386A - Spray gun - Google Patents

Description

N0V- 25, 1952 w. P. DALRYMPLE 2,619,386

SPRAY GUN Filed Oct. 6, 1949 agg WMA-a *Hf-Q ornecgs atented Nov. 25, 1.952

SPRAY GUN William P. Dalrymple, Rochester, N. Y., assignor to American Brake Shoe Company, New York, N. Y., a corporation of Delaware Application October 6, 1949, Serial No. 119,924

3 Claims.

This invention relates to spraying devices and more particularly to improvements in spray guns of the type adapted to spray two solutions simultaneously such as is disclosed in the application of Burr W. Mantle, Serial No. 119,850, led October 6, 1949.

In certain commercial processes and the like, such as, for example, in the silvering of mirrors, it has been found desirable to simultaneously spray two solutions on a surface to be coated. Various types of spray guns and other similar spraying devices have heretofore been developed for so spraying two solutions. However, the spraying devices heretofore developed for this purpose have had several inherent disadvantages such as, for example, being complicated in construction or operation; being heavy in weight, large in size, and, therefore, dicult to handle; or being impractical and ineicient in operation.

It is a primary object of my invention to overcome these disadvantages and to afford a novel spray gun of the aforementioned type which is constructed, and operable, in a novel and expeditious manner.

During the operation of spray guns of the type to which my invention relates, the guns are customarily connected to the source of fluid supply by flexible rubber hoses land the like, and the proper positioning of the latter so that they do not interfere with the manipulation of the gun during a spraying operation has been a problem. In this connection, it is a further object of my invention to provide a spray gun embodying novel clamping means for supporting the fluid supply hoses in a novel and expeditious manner on the gun.

Yet another object of my invention is to provide a novel spray gun wherein novel clamping means may be mounted on the front end portion of the gun for supporting supply hoses and the like in a novel and expeditious manner.

An object ancillary to the foregoing is to enable a novel clamping means to be embodied on the front end portion of a spray gun, in a novel manner whereby the clamping means affords a novel control unit for opening and closing the fluid supply lines supported thereby in accordance with the position of the trigger, or like unit, which controls the general operation of the gun.

Another object is to enable novel clamping means to be embodied on the front end portion of a spray gun whereby opening and closing of the fluid supply lines may be controlled in a novel and expeditious manner independently of the operation of the trigger of the gun.

Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accompanying drawings which, by way of illustration, show a preferred embodiment and the principles thereof and what I now consider to be the best mode in which I have contemplated applying those principles. Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings:

Fig. 1 is a side elevational View of a spray gun, certain parts being broken away, embodying the principles of my invention;

Fig. 2 is a front elevational view of the nozzle head embodied in the spray gun shown in Fig. 1;

Fig. 3 is a detail sectional view taken substantially along the line 3-3 in Fig. l

Fig. 4 is a detail sectional view somewhat similar to Fig. 3, but showing the parts in different operative positions;

Fig. 5 is a detail sectional view taken substantially on the line 5 5 in Fig. l;

Fig. 6 is a detail view somewhat similar to Fig. 1, but showing another modified form of my invention; and

Fig. '7 is a detail view taken substantially on the line 1 1 in Fig. 6.

The gun 20, shown in Figs. 1 to 5, inclusive, of the accompanying drawings to illustrate a preferred embodiment of my invention, is of the same general type as that disclosed in the copending application of Burr W. Mantle, Serial No. 119,850, iiled October 6, 1949, and, as is discussed in greater detail in the aforementioned co-pending application, is especially well adapted for simultaneously spraying two solutions on a single surface, such as, for example, spraying a silvering solution and a precipitating solution simultaneously onto the back surface of a mirror. The gun embodies a body 22 having a handle 24 projecting downwardly from the rear end portion thereof and a nozzle head 26 attached to the front end thereof. The nozzle head 26 comprises two nozzles 28 and 29, mounted in a nozzle plate 3l, Figs. 1 and 3, each of the nozzles 28 and 29 comprises a nozzle cap 28a and 29a and a nozzle body 28h and 2Gb, respectively. The nozzle head 26 is mounted on the front end portion of the body 22 of the gun 20 and is secured thereto by a screw 33 and a bolt 34, the screw 33 extending through the upper end portion of the nozzle plate 3 I, as viewed 3 in Fig. 1, and being in threaded engagement with the body 22, and the bolt 34 extending through a flange 38 depending from the front end portion of the body 22, and being disposed in threaded engagement with the nozzle plate 28 in an opening 31 formed in the lower end portion thereof.

Air enters the gun 28 through a passage 48 in the handle 24 and flows through the handle 24, the body 22, and out through the nozzle head 26, the aspirating effect of the air passing through the nozzles 28 and 29 being effective to cause solutions to be drawn through hoses Hi and H2 from a suitable source, not shown, into the nozzle bodies 28D and 29h, respectively, and discharged from the nozzle caps 28a and 29a, as discussed in greater detail in the aforementioned application of Burr W. Mantle.

The air passage 48, which affords means for feeding a working fluid such as compressed air into the gun 28, terminates at its inner end portion in an air inlet valve chamber 44.

A valve housing 48 having a longitudinally extending opening 48 and a plurality of transversely extending openings Fig. l, is screwed into the valve chamber 44 wherein it seats against a shoulder 55 formed therein. An air Valve 54 having a recess 56 formed therein is mounted in the Valve chamber 44 and is positioned to seat against a valve seat 58 formed on the inner end portion of the valve housing 48 adjacent to the inner mouth of the air passage 49. A push rod 68, having one end portion disposed in the recess 55 of the valve member 54, extends forwardly therefrom through a gland plug 6| screwed into the outer end portion of the valve housing 48. Gland packing 82 is positioned between the gland plug 6| and an inwardly extending collar 84 in the valve housing 48 to form a seal around the push rod 58 against the leakage of air from the longitudinal passage 49 in the valve housing 48. A collar 65, is loosely disposed on the push rod 68 and is urged against the packing 65 by a spring 51 mounted between the gland plug 5| and the collar 64, to thereby press the packing 85 against the collar 64. A compression spring 18 having one end portion engaged with the outer face of the air valve 54 and the other end portion thereof engaged with the inner surface of the handle 24 within a recess 12 formed therein, tends to normally maintain the valve 54 in engagement with the valve seat 58 on the Valve housing 48 and thereby seal the connection between the air chamber 44 and the longitudinal passage 49 in the valve housing 43. The outer, or front, end portion of the push rod 68, Fig. 1, engages a trigger by which the push rod 88 and, therefore, the valve 54 may be moved inwardly to unseat the valve 54 from the valve seat 58 and thereby permit the flow of air from the air chamber 44 into the air passage 49 in the valve housing 54, the trigger 15 being pivotally mounted on the body 22 of the gun.

A second passageway 11, substantially parallel to the air passage 48, is formed in the handle 24 and extends substantially through the entire length thereof. At the point which the passageway 11 intersects the air chamber 44, the valve housing 48 is somewhat reduced in cross section so that a space 88 is provided between the valve housing 48 and the side walls of the air chamber 44 and the air passage 11, so that air flowing through the openings 5| may flow through the enlarged opening 88 around the valve housing 48 up into that portion of the air passage 11 thereabove.

From the valve housing 48 the air passage 11 extends on into the handle 24 and intersects with another bore 8| formed transversely through the handle 24. A threaded plug member 85, of the type sho-wn in my co-pending application, Serial No. 734,819, filed March 14, 1947, is screwed into the bore 8| and seats against a shoulder 86 formed therein to thereby seal the passageway 8| against the flow of air longitudinally therethrough.

At the point where the passageway 11 intersects the bore 3| in the handle 24, the plug member is reduced in cross section so that a space 8|a. is formed between the plug member 85, the side walls of the bore 8|, and the air passage 11, so that air may pass through the space 8|a from that portion of the passageway 11 on one side of the plug member 85 so that portion of the passageway 11 on the other side of the plug member 85.

From the plug member 85 the passageway 11 extends on through the handle 24 and intersects with a suitable passageway such as the passageway 81 which extends longitudinally through the body 22 of the gun 28 for feeding compressed air from the passageway 11 outwardly through the nozzles 28 and 29 as is discussed in greater detail in the aforementioned co-pending application of Burr W. Mantle. l

The nozzles 28 and 29 may be of any suitable type, but are preferably of the type disclosed in the aforementioned Mantle application, and include nipples 28e and 29e, Fig. 3, which extend rearwardly through the nozzle plate 3| to thereby afford coupling members to which the hoses HI and H2 may be connected. It will be remembered that, during operation of the gun 28, solutions may be drawn through the hoses Hl and H2 from a suitable source, not shown, by the aspirating effect of air from the passageway 11 passing forwardly through the nozzles 28 and 29.

A hose clamp 88, Fig. 1, is mounted on the front end portion of the gun 28 for supporting the hoses Hl and H2 connected to the nozzle head 26. The clamping device 98 comprises, in general, a, body member 82 depending from the front end portion of the body 22 of the gun 28, and a retaining member 94 slidably mounted in the handle 24 of the gun 28, as will be discussed in greater detail hereinafter.

The body member 92 of the hose clamp 98 comprises a backing plate 96 attached to the rear face of the lower end portion of the nozzle plate 3| by any suitable means such as a bolt 91, and includes a rearwardly projecting abutment or clamping jaw 98 and a pair of rearwardly projecting clip members |8| and |02, disposed at the upper and lower end portions thereof, respectively. The body member 92 may be made of any suitable material, although I prefer to make it of suitable sheet material such as sheet steel and to form the clamping jaw 98 and the clip members |8| and |82 integrally with the backing plate 96 by bending suitable flanges on the upper and lower end portions of the backing plate 96 rearwardly into smoothly curved convex form as best seen in Figs. l and 5.

When the body member 98 is mounted in the aforementioned operative position on the nozzle plate 3| of the gun 28, the hoses Hl and H2 attached to the nipples 28C and 29e of the nozzles 28 and 29, respectively, may be extended rearwardly and downwardly from the nipples 28e and 29e over the clamping jaw 9B, Fig. l, and secured in this position by the clips |8| and |82,

which may be bent over, and snugly engaged with, the hoses H and H2, respectively, Figs. 1 and 5.

The retaining member d affords a second clamping jaw which is movable toward and away from the clamping jaw 58 into and out of clamping engagement with that portion of the hoses Hi and H2 disposed on the jaw S8, as will be discussed in greater detail presently. Thus, it will be seen that the retaining member 95| includes an elongated rod ldd slidably mounted in an elongated housing and having an enlarged square head ll on the front end thereof which is engageable with the front end of the housing |05, being too large to pass through the opening |53 formed in the front end of the housing |05.

A collar l l having a plug l l2 screwed into the free end portion thereof is screwed onto the rear end of the plug member S5 and affords an adjustable cap therefor.

T'he housing |05 is slidably mounted in the plug member t5 in the handle 2,4 of the gun 2S, and preferably has an outwardly projecting collar lila on the rear end portion thereof which is engageable with the rear end of the plug S5 within the collar to limit the forward movement of the housing |05 in the plug member 85. A compression coil spring I l!! is mounted on the rod |04 within the housing |05 with one end mounted on a nipple HS on the inner face of the plug member ||2 in the collar and the other end engaged with the inner surface of the front wall of the housing |05 to thereby yieldingly urge the housing |05 forwardly in the plug member 85. Adjustment of the forwardly urging force of the spring ld on the housing |05 may be readily made by adjustment of the plug ||2 inwardly or outwardly in the collar` lli.

As is best seen in Fig. 3, the rod |04 projects forwardly from the housing |05 through the trigger 'F5 on the gun 2S, with the enlarged head |01 slidably disposed through a slot HE in the trigger 15, the side walls of the slot I6 engaging the sides of the square head |07 to thereby prevent the rod |04 from turning upon its longitudinal axis. A crossbar i8 is mounted in the head |01 of the rod |04, forwardly of the trigger i5, and projects outwardly from the head |07 on both sides thereof in parallel alignment with the jaw 08 of the hose clamp 90. The crossbar ||0 is so disposed in the head lill' of the rod |04 that, when the trigger l5 is disposed in full forward position, the crossbar H8 is urged by the spring IIA, acting on the housing |05, into full forwardly dis posed position as shown in Fig. 4, in which position it is effective to collapse the hoses HI and H2 against the clamping jaw 98 to thereby effectively close the hoses and prevent the passage of iluid therethrough.

During the operation of the gun 2f?, when the trigger 'I5 is disposed toward the handle 24, the trigger '15 engages the front end of the housing |05 and presses the latter rearwardly, against the urging of the spring Hd, to thereby permit the rod ldd and the crossbar I8 to be moved rearwardly out of clamping engagement with the hoses Hl and H2 to thereby permit the latter to be opened by their inherent resiliency and the pressure of the fluid therein.

Thus it will be seen that the hose clamp 00a not only affords a novel and practical means for holding the hoses Hl and H2 in desired, out-ofthe-way position on the gun 20, but also includes a novel clamping means for controlling the opening and closing of the hoses and thereby for controlling the flow of fluid therethrough.

'Ihe modified form of my invention which I have shown in Figs. 6 and 7 operates on the same principle as the form of my invention illustrated in Figs. 1 to 5, inclusive, and is interchangeable therewith, and like reference numerals have been used on like parts and the same reference numerals but including the suffix b have been used on parts which are similar to, but which have been substituted for, parts of the form of my invention shown in Figs. 1 to 5.

It will be noted that the changes made in the modified form of my invention shown in Figs. 6 and 7 over the form of the invention illustrated in Figs. 1 to 5 comprises embodying means in the clamping device attached to the gun 20 for supporting the hoses HI and H2 for adjusting the flow of fluid through the individual hoses H! and H2.

For this purpose, the hose clamp Sla may embody a body member 92 comprising a backing plate 05, a clamping jaw 0B, and clip members |0I and |02, as embodied in the clamp 90, and

also includes a clamping bar 20 movably mounted on the ,jaw 98 by two screws |22 and |23, Figs. 6 and 7, which extend through the bar |20 and are screwed into the lower portion of the clamping jaw d0. The bar |20 is disposed vtransversely across the hoses H l and H2 on the opposite side thereof from the clamping jaw 98, and the screws |22 and |23 are effective to move the bar |20 toward and away from the jaw 98 to thereby adjust the clamping pressure applied to the hoses by the jaw 98 and the bar |20. Thus, it will be seen that by adjusting the individual screws |22 and |23, to thereby adjust the position of the respective ends of the bar |20, the pressure of the bar |20 on the individual hoses Hl and H2 may be adjusted to thereby control the size of the free opening therethrough, and therefore, the ow of fluid therethrough. This, it will be seen, affords a novel, and quickly operable means for adjusting the flow of fluid through the hoses Hi and H2 which is readily accessible to the operator of my novel gun.

From the foregoing it will be seen that I have provided a novel spray gun which is adapted to simultaneously spray two solutions from separate nozzles, in a novel and expeditious manner.

Also, it will be seen that I have provided a novel gun wherein the hoses by which the working fluid is fed to the gun, are supported in a novel and expeditious manner thereon.

Furthermore, it will be seen that I have provided a novel gun which is practical and efficient in operation, is quickly and easily assembled an-d disassembled for the purposes of cleaning and repairing, and may be readily handled.

Thus, while I have illustrated and described the preferred embodiment of my invention, it is to be understood that this is capable of variation and modification and I therefore do not wish to be limited to the precise details set forth, but desire to avail myself of such changes and alterations as fall within the purview of the following claims.

I claim:

1. In a spray gun, a relatively elongated body, a handle depending from the rear end of said body, a substantially flat plate secured to the front end of the body and including portions respectively extending outwardly of opposite sides of the body, a nozzle member mounted in each of said portions and disposed to cause the fluid streams emitted therefrom to converge forwardly of said plate, said handle, body and plate having communicating passages formed therein through which air under pressure may be supplied to said nozzle members, valve means for regulating the flow of air through said passages, each nozzle member including a nipple disposed to project from the rear face of the portion of said plate in which the nozzle is mounted whereby the free ends of hoses respectively disposed on opposite sides of said body may be connected to said nozzles to supply liquid thereto, clamp means secured to and depending from said plate and in which the hoses may be disposed to be connected to the gun, a second valve means operative to regulate the flow of liquid through said hoses, said second valve means including a first member fixed to said flat plate in position to engage one side of the hoses, and a second member normally being urged against the other sides of the-hoses t-o thereby constrict the passageways in the hoses, a trigger member mounted pivotally on said body and disposed to depend therefrom forwardly of said handle and inwardly of said plate, and means engaged with sai-d trigger and operative to withdraw the second member of `the second valve means in a direction away fro-m the hoses upon movement of said trigger toward said handle.

2. In a spray gun, a relatively elongated body, a handle depending from the rear end of said body, a substantially fiat plate secured to the front end of the body and including portions respectively extending outwardly of opposite sides of the body, a nozzle member mounted in each of said portions and disposed to cause the fluid streams emitted therefrom to converge forwardly of said plate, said handle, body and plate having communicating passages formed therein through which air under pressure may be supplied to said nozzle members, valve means for regulating the flow of air through said passages, each nozzle member including a nipple disposed to project from the rear face of the portion of said plate in Which 4the nozzle is mounted whereby the free ends of hoses respectively disposed on opposite sides of said body may be connected to said nozzles to supply liquid thereto, a portion of said plate depending below the lower edge of said body, clamp means connected to the last named portion of said plate and including apart disposed below and in spaced relation with the lower edge of the plate, said part being c-onstituted and arranged to afford means for clamping the hoses to secure the sameto the gun, a second valve means operative to regulate the flow of liquid through said hoses, said second valve means includng a first member fixed to said iiat plate in position to engage one side of the hoses, a second member disposed to bear against the other sides of said hoses, and spring means urging said second member in the direction of the first member and against the other sides of the hoses to thereby'constrict the passageways in said hoses, a trigger member pivotally mounted on said body and disposed to depend therefrom forwardly of said handle and inwardly of said plate, and means engaged with said trigger and operative to open said second valve means upon movement of said trigger' toward said handle.

3. In a spray gun, a relatively elongated body. a handle depending from the rear end of said body, a substantially fiat plate secured to the front end of the body and including portions respectively extending outwardly of opposite sides ofthe body, a nozzle member mounted in each of said portions and disposed to cause the fluid streams emitted therefrom to converge forwardly of said plate, said handle, body and plate having communicating passages formed therein through which air under pressure may be supplied to said nozzle members, valve means for regulating the flow of air through said passages, each nozzle member including a nipple disposed to project from the rear face of the portion of said plate in which the nozzle is mounted whereby the free ends of hoses respectively disposed on opposite sides of said body may be connected to said nozzles to supply liquid thereto, a portion of said plate depending below Ithe lower edge of said body, clamp means connected to the last named portion of said plate and including a part disposed below and in spaced relation with the lower edge of the plate, said part being constituted and arranged to afford means for clamping the hoses to secure the same to the gun, a second valve means for regulating the flow of liquid through said hoses and comprising a reaction member disposed between the rear face of the plate and the hoses and also including a membe` engaged with said hoses on sides thereof opposite those engaged with said reaction member, means normally urging said second valve means and said member engaged with said hoses in opposition to `said reaction member into positions to close oif flow through said passages and said hoses, a trigger member pivotally mounted on said body and disposed to depend therefrom forwardly of said handle and inwardly of said plate, and means engaged with said trigger and operative upon movement of said trigger toward said handle to open said second valve means and to withdraw said member engaged with the hoses in a direction away from said reaction member to thereby permit flow of air under pressure and liquid to said nozzles.

WILLIAM P. DALRYMPLE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 729,423 Scheiber et al May 26, 1903 1,347,931 Bowes July 27, 1920 1,825,227 Grady Sept. 29, 1931 1,876,988 Lormor Sept. 13, 1932 2,107,726 Bramsen Feb. 8, 1938 2,255,189 Robinson Sept. 9, 1941 2,356,865 Mason Aug. 29, 1944 2,380,827 Downs July 31, 1945

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