US1887487A - Hoisting device - Google Patents

Description

H. s. GE'ER HOISTING DEVICE Nov. l5, 1932.

File'a Nav, 9, 1951 2 ShAeetS-Sheet 1 umHlllmmhllllmlllil1 ATTORNEY 'y N0V- 15, 1932- H. s. GEER I 1,887,487

HOISTING DEVICE Filed Nov. 9. 1931 2 shams-,Sheet 2 INVENTOR ATTORNEY HOBART s. GEBR, OF CORONA,

Patented Nov. 15, 1932 UNITED STATES PATENT l oFFicE co., on Nrw Yoan, N. Y., CORPORATION OFNNWYORK HOrsTiNe ADEVICE Application led November 9, 1931. Serial No. 573,807.

ldevice of this character embodying a pair of Cable receiving drums together with ratchet means co-operating with each-drum, and a single pivotally mounted operating lever actuating the ratchet means in the movement oit said lever in one direction to simultaneously rotate the drums and wind the cables thereon.

It `is another V feature of my invention in one embodiment'thereof to pivotally mount the operating lever` at one of its ends between f the cable drums, said lever carrying independently acting pawls co-operating with ratcliets on one end of the respective drums,

and additional means on said lever whereby either of the pawls may be retainedin an inoperative position, so that the drums can be selectively rotated independently of each other.

- It is a further general object of my inveny the parts shown in Fig. 6.

.Referring forthe present, moreparticution vto provide a hoisting device as above characterized, which is of relatively simple mechanical construction, exceedingly strong and durable, and which may be operated with ease and facility, and with complete safety to the workmen standing on the scaoldplatform.

The subject matter of the present application, in part, is a continuation of my pending application for patent, Serial No. 524,240, iiled March 21, 1931, but in addiltion to that portion of the disclosure of said will be hereinafter more fully described, illustrated in the accompanying drawings, and

VT YORK, vKASSIGN'ORTO AMERICAN SAFETY .BEVCE subsequently incorporated in the subjoined claims.

In the dra-wings wherein Ihave'A disclosed several simpler and practical embodiments of my invention, and in whi'chsimilar reference characters designate corresponding i parts throughout the several views,- 1

Figure 1 is a vertical sectional view through one side of a scaiold having the present invention applied thereto', the operatingllever vior the hoisting device being shown in dotted lines at one end of its normal Joperating strolre, and in full lines iii an eXtreme position and-released from operative .connection with the .hoisting drums' Fig. 2 is a front elevation, the support-"- ingframe members and parts of the hoisting drums being shown in section; y

Fig.' 3 is an enlarged detail sectional view talrenon the line 3- 3 of Fig. l;

' Fig. 4L is a detail vertical section of a modified embodiment of the invention, designed Y more particularly for a heavy duty machine;

Fig. 5 is a sectional View taken on the line 5-5 offFig. 4; 1 'l Fig. 6 is. a view similar to Fig. l showing another alternative form of the device; and

Fig. 7 is a perspective view of certain of larly to Figs. 1, 2 and 3 of the drawings, as ,l therein illustrated, the supporting iframe for y secured vertically spaced laterally projecting d loop members indicated at 9 to receive guard rails 10 extending between the hoisting devices located adjacentopposite` ends of vthe x scalold platform.

Upon a horizontal shaft 11 rigidly fixed at its ends in the spaced uprights 5, al pair of drums 12 and 13 respectively are mounted for free relative rotation. Each drum at its opposite ends is provided with the usual heads, and the opposed heads of said drums are provided upon their peripheries with the ratchet teetl 111 and 15 respectively. Upon the tie rod 8 above said drums, spring pressed holding dogs 16 and 17 are pivotally mounted and normally engaged with the ratchet teeth 14C and 15 respectively to hold said drums against rotation in one direction.

Between the drums 12 and 13, one endof thc operating lever 18 is pivotally mounted Upon opposite sides` on the fined shaft 11. of this lever, the pawls 19 and 2O are pivotally mounted as at 21 and yieldingly urged by suitable springs 22 the respective ratchet teeth 141 and 15 of said drums. At their pivoted ends, each pawl is formed with a downwardly projecting lug 19 and 2 0 respectively, whichin one position of the lever are adapted to abut against the cross bar 6 of the supporting frame, whereby said dogsV will 'be moved out of 'effective engagement with the ratchet teeth 14 and 15. y

F or the purpose of illustrating one application of my present invention, I have shown the .frame uprights 5 connected at their lower ends to parallel horizontally dis'- posed beams, one of which'is vindicated at 23. Between the opposite-ends of these shown at 2% are rotatably mounted and `around the same the cable 25 extending downwardly from drum '13 is engaged. The

similar cable 26 extends upwardly from the other drum 12. The upperl kends of these cables are suitably anchored in the usual manner-'to ab'eam or outrigger projecting outwardly :from the building frame structure.

The beams 23 supper the scadold plat-- form indicated at 2". `Upon theinner side of this scaffold platform, a longitudinally extending stop rail 28 is 'hingedly mounted as at'29. lVhen this rail is in upright position as seen in FiOz 1 it acts asa ystoo` to limit the downward movement of 'the drum operating lever 18 andprevents contact of the lugs 19 and 20 of the ratchet pawls with the 4'bar 6. Y

The cable 26 is engaged with a guiding roller 30 pivotally and slidably supportedv on the Atie rod '7, which insures the proper winding -same outwardly with the foot until the fingers or lugs 19 and 20 of the ratchet pawlsV engage the bar 6, thus releasing said pawls from operative engagement with the drum ratchets 14 and 15. rlrhe dogs 16 and v17 are @also lifted upwardly to the dotted line position shown in Fig. 1 out of engagement with the drum ratehcts. The cables into engagement with Laarne? 25 and 26 may now be freely unwound from the respective drums and anchored at their upper ends to the overhead beams. Upon release of the dogs 16 and 17, the drums will then be locked against further rotation to permit the cables to unwindthere'from. The

'levers 18 of'ithe hoisting device are then moved upwardly so that the pawls 19 and 20 are thrown kinto engagement with `the respective "ratchets by springs V22. The scaffold platform 27 is now arranged upon the supporting beams 23 and the rail 28 raised to the upright position seen in Fig. 1 of the drawings. It will now be evident that in each downward movement of the operating lever 18, through the medium of the ratchet engaging ` pawls 19 and 20, the two drums will be simultaneously rotated in an anticlockwise direction, thereby windingthe cables 25 and 26 on the respective drums and raising the scaffold. However, in case of uneven winding of the cables on the drums, either'of the pawls 19 and 20 may be'manually released from engagement with the ratchet tceth'of the respective drums so that one of 'i the drums will remain stationary while the other drum is rotated in the manipulation of the lever 18. 1f desired, suitable means such as that indicated in Fig. l may be provided for holding the pawls in their released posil? rotation of the drums in a clockwise-direc-rv tion and the unwinding of the respective cables therefrom.

In Figs. l and 5 of the drawings, I 'have illustrated afheavy duty type of hoisting device in which the drums 12A and 13 are vertically spaced apart in the frame of the hoisting device. rllhe operating lever 18 is pivotally mounted at one of its ends as at 18a between these vertically spaced drums. Upon one side of this lever, a comparatively llong pawl 31 projects upwardly and is yieldingly held at its free end in operative engagement with the teeth of the ratchet 14 on the upper drum by means of a suitable spring 32. Upon the opposite side of the lever 18, a comparatively short pawl 33 is pivotedand extends downwardly therefrom and is urged into engagement with the teethfof the ratchet 15 on the lower drum by means of a suitable spring-34. Each of the pawls at its pivoted vend is formed with a lug 31 and 33 respectively engaged by an adjustable bolt-or screw 35, 36 carried by the lever 18. Upon adjustment of these screws in one direction Vagainst said lugs,` .it will be readily lunderstood that the free ends of the pawls will be that the two drums may be simultaneousl i operated on the downward movement of lever 18 to wind the respective cables thereon, or if desired, either of these drums may be thus operated independently of the other. ratchet pawls are so located with respect to the pivot 178 and the operating lever 18 is of such length, that in each downward stroke of the lever, the pawls will impart a powerful though relatively short rotative movement to the respective drums.

In Figs. 6 and 7, I have illustrated an alternative of the last described embodiment of the invention, in which separate levers 18b and 18C are associated with the respective vertically spaced drums, eachof said levers carrying the spring ,pressed ratchet engaging pawls 37 and 38 respectively for rotating the drums in a winding direction. To the lever 18, a connecting bar 89 is pivoted at one of its ends as at 40. The other end of this bar is suitably notched as indicated at 4l, to receive a headed stud 42 projecting from one side of the lever 18h. A pivoted yoke element 43 is mounted in the latter end of bar 39 and is recessed as at 44 to receive one side of the shank tioned in notch 4l and the yoke element 48 is swung into parallel relation with the bar 39, upon then adjusting the nut 46 into tight Vclamping engagement against the end of said bar, the two levers are thus connected'for simultaneous pivoting movement. Thus, in the manual operation of the upper lever 18",

- both drums will be actuated to wind the respective cables thereon.

When it is desired to operate the drums independently of each other, the bar 39 may be readily disconnected from lever 18b by adjusting the nut 46 and disengaging theyoke member 43 from stud 42. The bar 39 will then hang from its pivot 40 in pendent relation to the lower lever 18C. The two operating levers can then be independently manipulated. I

From the foregoing description considered in connection with the accompanying drawings, the construction, manner of operation and several advantages of my improved hoisting device will be readily and fully understood. It will be evident that both of the described constructions will provide devices of this kind which may be easily operated with minimum manual labor for the lifting of either light or heavy loads. While these described constructions will be efficient and reliable in operation, it will nevertheless be un- The i samemayalso'be-embodied 'invvarious other falternative'structural forms, and I therefore reserve the' privilege 'of .-resortlngto all vsuch legitimate changesl in the form, construction A and Vrelative arrangement of .the several :parts thereof as'be fairly embodied withinthe spirit andiscope of theappended'claims." I claim':` a f f Y k'1. A'hoisting device comprising a rotatably mounted drum, a pivoted operating lever for d said-drum, a member `pivotally lmounted on said lever-co-operating Vwith the drumto rotate theflatter in themovement of said lever in one direction, and a fixed stop engaged by said member upon movement of the lever to an eXtreme position to hold said' member out of operative engagement with the drum.

v. 2. A hoisting device comprising a rotatably mounted drum, a pivotedoperating lever for said drum, a member pivotally mounted on said lever f Yco-operating with v,the drum to rotate the latter in the movement of said lever in one direction, a xed' stop engaged by said member upon movement of the lever to an extreme position to hold said member out of operative engagement v with the drum, and

an adjustably mounted member adapted to be positioned in the path of movement ofthe drum operating lever, to limit the ymovement of the lever towards such extreme position VVand prevent engagement of the drumV actuating member with said stop.

3f A hoisting device comprising a frame,

vertically spaceddrums rotatably mounted in said frame, a lever pivoted at one end upon the frame between said drums, independently acting devices carried by the lever and cooperating with the respective drums to simultaneously rotate the latter in the movement of said lever in one direction, and separate adjustable mean'smounted on said lever to selectively vmove and position said devices out of c'o-operative relation with the respective drums whereby either of said drums maybe rotated' independently of the other. Y n

4. A hoisting device comprising al frame, vertically spaced drums rotatably mounted in said frame, a lever pivoted at one end on the frame between said drums, ratchets on the correspondingends of the drums, a pair of Y frame and each having a'ratchet at one end,"

GZI- 1,887,487

iang'le operating leverpvoted `at one offts rends between said drums, ay pair of :pavvls .pvotally mounted' at one of their ends on opposite sides of-sad lever,A a spring acting upon each pawl to veldngly hold its other end .in engagement Wth'one ofthe drum ratohets, and means adjustably mounted upon the level` for selectively moving said paWls to an noperative `position relative to the associated 13 drum ratchet Intestimony-that IV claim the foregoing as .1ny.nvention, I have signed my name hereto.

AHOBART S. GEER.

Images