US2692169A - Adjustable scaffold hoist - Google Patents

Description

Oct. 19, 1954 L. v. PHILLIPS ADJUSTABLE scAFFoLD HoIsT 4 Sheets-Sheet 2 Filed OGt. 19, 1951 @Iwo . INVENTOR. AVER/VE V. P///P5 4v-Tanner Oct 19, 1954 1 v. PHILLIPS ADJUSTABLE scAFFoLD HoIsT.

4 Sheets-Sheet 3 Filed Oct. 19, 1951 www..

INVENTOR. AVFNE MPH/LIPS ct. 19, 1954 l.. v. PHILLIPS ADJUSTABLE SCAF'FOLD HOIST 4 Sheets-Sheet 4 Filed Oct. 19, 1951 INVENTOR. AVER/vf V- Pff/MP5 Arron/VET 'Patented oci. 19, Y1954 UNITED STATES PATENT (lli'FIfl-LEv ADJUSTABLE scAFEoLD HoIsT Laverne V.V Phillips, Mitchell; S..Dak.

Applicationictolierflil, 1951, f Seriali No. y252,123

1 claim. l

The present inventionrelates Lto. an: adjustable scaioldhoist and itfconsistsinthe combinations', constructions and arrangements of partsahereln described and claimed.

Generally there is provided a1pluralityK ofsubstantially rectangular units` each. having a verticallyv extending leg: member ati each corner thereofv and the legs. of' each of. the. succeeding units being telescoped withinthe-corresponding legs of the unit therebelow; Each'unitis' provided at eachA of its narrower ends with a- Vvshaped bracket which normally extends1below an upper cross' arm of the' unitl therebelowV and is connected therewith by fallswhichiare', invturn; -connected with a centrally disposed. winch= carried by the'lowermost unit. A m'otox'- is: likewise carried by the lowermost unit andi mayv be controlled from. the uppermost-unit, if? desired, or from any other convenientpositiom @ne-of the principal features of theA invention isf that the various cables emanating froml the falls constitutein themselves a safety factorl since the accidenta'l' breaking one of' such cables will still leave the remaining cables in aposition-tc main,- tain the device in whatever positionin which it then may be.

It is accordinglyl anl object of vthe inventiont'o provide an apparatus ofthe character set forth which is exceedingly'sirnplz-riny construction; inexpensive to manufacture, easyto-repairbythose of normal skillv and yet effective and` efficient in use.

Anotherl object of the invention" is the provision ofan apparatus of the character set forthhaving novel means for raisingand loweringthe same;

A further object of the inventionv is the" pro'- vision, in an apparatusioftlie character'set forth; of a novel extensibleladder forming a: partoftlie invention.

Other and further objects ofthe" invention will become apparent from a reading of the following specification taken in conjunction withthe drawings, in which:

Figure 1 is a side elevational view of an embodiment of the invention;

Figure 2 is a top plan. view. thereof,

Figure 3 is a sectional. View taken alongv line 3 3 of Figure 1,r

Figure 4.is a sectional view'taken alongl line 4 4 of Figurev2,

Figure 5.is an end elevational' view off the ap- Figuren isa-view similar to Figure 5 but showing the apparatus in extended position,

Figure 81is ak sectional view taken along.v line 8-8 i of Figure '7,4

Figure 9 is a fragmentary perspectiveview illustrating certain details of construction,

Figure is anenlarged fragmentary sectional viewl taken substantiallyy along; line Ill--I of Figure 2,

Figurer 1.1i isf an enlarged' `fragmentaryv sectional viewy taken.l substantially along: line Iii- I I of- Fig.- ure 2.

Figure 112 is'an enlarged fragmentary sidefelevationa-l view illustrating in details features of construction, and

Figure; 13` is a; fragmentary" side' elevational view illustrating f a` winch and: motorl forming Aa part of the invention;

Referring' moree particularly* to the drawings, there: is. show-nL therein an embodiment; of, the invention: in. which there? is` provided three-1 units; namely ai bottom. unit generally: indicated: at; Hf, am interniediate` unit generally indicatedv at I:I and atop unit generallyindicated" at |22 Each of' the units isr generally: rectangularv in' shape when viewed. from above. or: below.

The bottom. orbase unit'` I0fis provided.: atleach corner with a vertically extending' hollow cylindrical leg I3, the endilegsA in eaclfrcase being'interconnected at' their upper ends by an upper cross bar I4 and atw their lower endsby'a lower crossbar` I5; The legs I3 ateitherside off' the unit If'Ilfare interconnectedv by-side-bars I Gfwliicli extend inwardly therefrom and'A whichare com nected toffsideA plates Ifi-I in an adjustabieimanner; asy indicated atl I8`; The side plates- I1 are interconnected byapair of spaced parallel sup'- porting bars I 9- from' which a' platform 291 is dependently supported byflegs 2l. Adjustable-truss members' 22 interconnect theA plates' Ill and'C the lower'portions of each ofthe-legs I3 andbracket members 'Z3`` interconnect the inner portions of each of the members I6 with the upper" portion of the adjacent legsl I3' to providey additional rigidity to the members |6 Eaclrof the cross barsl f4 has affixed.L thereto an inwardly extended U-shaped bracket 2# in which is revolubly mounted a pulley 25". In the lower end of: each ofl the legs I3 there is mounted in the present form of the invention a caster- 26 for supporting theentire appartus. However; it will bey apparent that theV basey unit I0 maybe mounted'upon a truck or` other'veliicle'or maybe provided with means oflccomotion inl itself;

The intermediate. unit. I'I is likewise provided with' a` vertically extending hollow cylindrical' leg 21 at eachof its corners whichrlegs are telescopi cally mountedin each of the legs` I3 respectively andthe legs 21 at each end' of the unit II` are interconnected by a cross bar '2)8 adjacent the upper end thereof and each is provided with an inwardly extending horizontal side bar 29 whose inner ends are receivable telescopically within a cylindrical member 30.

Vertically dependent from each of the bars 28 is a V-shaped bracket 3l in the lower or apex portion .of whichl is mounted a pulley 32.

Referring now to the top unit I2 there is likewise provided at each corner thereof a hollow cylindrical leg 33 which extends vertically and telescopically into the leg 27 and the legs 33 at each of the shorter sides of the unit I2 are interconnected adjacent their upper ends by a cross bar 34 and each of the legs 33 is provided with a horizontally and inwardly extending bar 35 which is telescopically receivable at its inner endl in a hollow cylindrical member 36. To the outer side of each of the cross bars 34 there is dependently and vertically mounted a V-shaped bracket 37 in the lower or apex portion of which there is mounted a pulley 38. 'I' Each of the cross bars 28 has afxed to the outer side thereof a U-shaped bracket 39 in which is revolubly mounted a pulley 46. Upon the platform 20 there is mounted an electric motor 4| which is connected by means of a belt 42 with a pulley 43 affixed to one side of a drum 44. The drum 44 has aiixed thereto a ratchet wheel 45 with which a pawl 46 is engaged. The pawl 46 is revolubly mounted upon an ear 41 carried by one of the legs 2| and a compression spring 48 is interposed between the pawl 46 and the leg 2| with which it is associated.

' A cable is affixed, as indicated at 49, to the outer end of each of the brackets 24 and extends downwardly, as indicated at 50, whence it is entrained over the pulley 32 and thence extends upwardly over the pulley 25 and thence to the drum or winch 44. Likewise to each of the brackets 39 there is axed a cable 5I which extends downwardly and is entrained over its associated pulley 36 and thence extends upwardly over the pulley 40 and thence to the winch 44.

In the upper ends of each of the pairs of end legs 33 there is telescopically mounted the legs 52 of a U-shaped fence member 53. At various points about the apparatus the corner portions may be interconnected by plates 54 or the like to provide additional rigidity to the apparatus.

In operation, it will be apparent that the de- `vice may be normally in a collapsed condition as shown, for example, in Figure and that when it is desired to raise the same to be used as a scaffold, it is only necessary to operate the motor 4I which operation may take place from the 11ppermost or top unit I2 by remote control and that when such action occurs the winch 44 will act to wind thereon the cables 50 and 5I to thus raise the V-shaped brackets 3I and 37 and by the same token move the legs 27 out of the legs I3 and at the same time the legs 33 out of the legs 21. As this action occurs, the pawl 46 will allow the teeth of the ratchet wheel 43 to pass thereby and thus it will be seen that as the top unit I2 is raised to desired position, that the same will automatically be locked in such position until it is desired to lower the apparatus which may be done in any suitable manner preferably by utilizing a brake in connection with the winch 44 in conventional manner at which time, of course, the pawl 46 will be disengaged from the ratchet wheel 43.

At one end of the apparatus there is provided a vertically dependent ladder which is alxed 4 to the cross bar 34 and which ladder is indicated at 54a. A like ladder 55 is vertically dependent from the cross bar 28 and underlies the ladder 54a. A ladder 56 is formed as a part of the lower or base unit I 0 and consists of one of the legs I3 together with a parallel interconnecting leg 57 and a plurality of rungs 58 which interconnect the leg 57 with the adjacent leg I3. It will be seen that the ladder 54a extends slightly outwardly of the plane of the leg 33 while the ladder 55 extends slightly inwardly of the leg 21 to thus afford clearance of such ladders when the apparatus is collapsed. Likewise the ladder 56 is in the same plane as the legs I3 to further avoid any interference with the ladders 54a and 55 when the apparatus is in collapsed condition.

While but one form of the invention has been shown and described herein, it will be readily apparent to those skilled in the art that many minor modications may be made without departing from the spirit of the invention or the scope of the appended claim.

What is claimed is:

An apparatus of the character described comprising a base unit, an intermediate unit, and a top unit, each of said units being generally rectangular in plan view, and each being telescopically mounted in the unit next therebelow, means for simultaneously extending the intermediate and top units upwardly with `respect to the base unit, said base unit havingl a hollow cylindrical vertically extending leg in each corner thereof, said intermediate members having a hollow cylindrical vertically extending leg in each corner thereof and each vertically slidable in a leg of the base unit, and said top unit having a vertically extending leg in each corner thereof, each vertically slidable in one of the legs of the intermediate unit, a cross bar interconnecting the upper end portions of each pair of legs at each end of each unit, a dependent V-shaped bracket aiiixed to the outer side of each cross bar of the top unit, a dependent V-shaped bracket aixed to the inner side of each of the cross bars of the intermediate unit, a pulley centrally mounted on the outer side of each cross bar of the intermediate unit, a pulley centrally mounted on the inner side of each cross bar of the base unit, a pulley mounted at the lower end of each V-shaped bracket, a winch mounted on the base unit, cables each aflixed at one end to each cross bar of the base unit and of the intermediate unit and each extending downwardly and entrained under the pulley on the bracket of the next uppermost unit and thence upwardly and over the adjacent pulley carried by the cross bar of its associated unit and thence extending to and connected with said winch.

References Cited in the le of this patent UNITED STATES PATENTS

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