US1591362A - High-speed free-chain hoist - Google Patents

Description

f July 6, 1926.

F. w. col-'FING HIGH SPEED FREE CHAIN HolsT 2 sneetsv-shet 1 Fild July 22, 1924 ATTORN YS July' 6 1926. lv-Sglg i F. w. COFFING;

-IIGljl SPEED FREE CHAIN HOISSIl Filed July' 22, 1924 2 sheets-sheet 2 IN VEN TOR ATTORNEYS Patented July 6,1926.

UNITED 'STATES PATENTOFFICE.

FREDBIGK W. COFFING, 0F DANVILLE, ILLINOIS, ASSIGNOR TO OTTO WALTER, l

' PERRYSVILLE, INDIANA.

HIGH-SPEED rana-cnam no Isfr.

implication mea July 22, 1924. `serial 110. 727,527.

This invention relates to a high speed free chain hoist, and the objectl of this invention isr to provide a lightweight and high speed ,hoist which may be readily and conveniently A still. further object is to provide a hoist of this character wherein a highdegree of power is applied to the chain and wherein the chain may be held in any position -or adjustment and conveniently controlled irrespective of whether it is being payed outof or drawn into the housing.

A still further object is to provide a chain hoist having these advantages and which-'is of` simple and durable construction, reliable in operation, easy and convenient to control Vso and comparatively inexpensive to manufac ture.

Other objects and .advantages of the invention'reside in certain novel lfeatures of the construction, combination, and arrangement of parts which will-be hereinafter more fully described and`particularly pointed out in the appended claims, reference being had to the accompanying drawings forming part of this specification, and in which: f

.Figure 1 is a view in side elevation with parts broken'away and shown in section and illustrating one vembodiment ofthe invention ' Figure 2 is aview 'in section on line 2 2v of F1 ure 1, the chain being omitted and parts eing shown in elevation' for the sake of illustration; Y

Figure 3 is a fragmentary view in section l on line 3-3 of Figure 2;.

Aso

- of illustrations; l l

Figure 5 1s a vlew 1n elevation, showing- Figure 4 is a view of the hand crank and assoclated parts in side elevation, a portion of the hand cranklbeingbroken away and parts being shown in section for 'the lsake the inner lside of lthe handle;

Figure 6 is a detail v1ew,'show1ng the rerlease mechanism for the locking pavvl;

' and Figure 7 is a view, partly in section and' .partly in elevation, showing the swivel connection ofthe hook to the chain;

Figure 8 is a view in horizontal section on line 8 8 of Figure 1; and

Figure 9 is a similar view on line 9-'9 of Figure 1.

Referring to the drawings, the numeral 10 designates generally the housing' or casing c hain which is designated at 15. The lateral extent of the magazine is such as to permit tive to the walls 11 of the housingbut these links are constrained to movement in .the

peripheral lflanges 12` secured to.

the links of the chain to freely move rela-y plane of the housing This vpermits the chain. to be readil moved into the. housing or to be readily 1 ithdrawn therefrom withyout danger of its links becoming entangled y with each other ory with surrounding objects. A gearcasing 16 is integrally formed with the parts of the housing and in the side walls of the gear casing a shaft 17 is rotatably mounted. A sprocket wheel 18 is keyed or otherwisexed' to the shaft 17 and its teeth which engage the links of the chain 15 4oper-u ate in proximity to a Wall 19 of the gear casing 16, the Wal1.19'providing"ja guide or track for the chain 15 while the same is being moved into the magazine'14 or being paid out yof the same by the sprocket wheel'18.

'A` hand crank 20, which constitutes an I has a hub 21 rotatably fitted on one end of the shaft 17, and held against axial displacement by means of a screw 22 and Washer 23 by means of the engagement of the flange 24 of the'hub with elements to be later described. A ratchet wheel 25 is fixed to the shaft 17 and/in the'assembly is locatedv within the flange 24 of the hub of the hand lever 2.0. This ratchet wheel has teeth pro- ,i

vided with inclinedand vertical faces. A ',105

pawl 26 is pivcally mounted, as at 27, on

the handle20 and is controlled by an angu-A lar and pivoted finger` piece 28 pivotally mounted on the handle andnconnected b a;

rod 29 with a lugBO integral the hub of the sprocket of the pawl 26. The pawl 26v and ratchet wheel provides a pawl and ratchet connection' or vmore generally a one-way driv- -ing\.connection between the hand crank or operating element and the Shaft. The hand lever 20 is of channel form so .as to house the rod 29 and similar parts. A s ring 31 is provided and coacts with the ange of the handle 20 and with the pawl 26 to urge the pawl into engagement with theteethv of the ratchet wheel 25. With this arrangement when the hand crank or hand lever 2O is rotated in one direction it will impart.

be rotated in a clockwise direction, as viewed` '1n Flgure 1 so as to pull the chain 15 into the magazine 14 of the housing.

In order to control the reverse rotation of the sprocket wheel 18 that is the rotation in a counterclockwise direction as viewed in Figure 1, a locking pawl is providedand is pivotally mounted, as at 36, Vwithin`the gear casin 16. The outer end of this pawl is engagea le with theteeth of the sprocket 18 to hold the sprocket against reverse rotation and a spring 37 is provided for urging the outer end of the pawl 35 into engagement with the teeth of s he sprocket 18 for this purpose. I Y

AReleasing mechanism is provided for the locking pawl 35 and this releasing mechanism 1s preferably controlled'from the hand crank 2O as will presently be described. It will be notedl that the pawl 35 is provided with a cammingsurface 38with which the teeth of the sprocket 18 coact to throw the pawl 35 out of engagement with the teeth when the sprocket 18 is being rotated to draw the chain 15 into the housing. One side of the outer end of the locking pawl 35 is formed with an outwardly extending and laterally offset lip 39 which is disposed out of the plane of the teeth of the sprocket 18 and which coacts with a lug 40 integrally formed with or otherwise-rigidly secured to .an oscillatable control late 41. This control plate 41 is dispose to one side ofthe gear casing 16 and is mounted for limited rotation on the shaft 17 The lug 40 projects laterally from the plate 41 and operates in an arcuate opening 42 formed in the gear casing. In one position in the opening 42 the lug 40 en ages the lip 39 and holds the pawl 35 o ut o engagement with the teeth )18 as shown in Fig. 3. In its other position in the opening 42 the lug 40 is out of the eld of movement of pawl 35 sprin plate 41 and the lug 40 anddoes not interfere with the engagement of this pawl with the teeth of the sprocket 44 encircles the shaft 17 16 and the plate l41 18. A coil spring between the gear casing ad one end of the spring gear casing while the' other end is secured to the plate 41 by being wrapped around or 44 is secured to the otherwise connected to the lug 42. This 44 is of the tortional type and is tenso that it tends to move the control to such position in the opening 42 that the lug 40 will engage the lip 39 of the pawl `35 and hold vthe pawl 35 out of engagement with the teeth of the sprocket 18. Thus whenever a tooth o f the sprocket 18 coacts with the camming surface 38 of 4the pawl 35 to throw the pawl 35 away from'the teeth 18,;"the spring 44`efl`ects a quick rotation of the plate 41 to bring the lug-40 into engagement with the lip 39 of the pawl to hold the pawl out of engagemei with the teeth of the sprocket.

e formed with teeth 45 having inclined and vertical faces, and with these teeth 45 a pawl 46,'pivotal'ly connected, as at 47 ,l to the hand crank 20, co'acts. A spring 48 urges the pawl sione '46 into engagement with the teeth 45 of the control plate 41. This pawl 46 may be disengaged from the teeth 45 by gripping the handle member 20a of the hand crank since an operating member 50 forthe pawl 46 has an oset end A51 pivotally connected, as at,

periphery of the control plate 41 is crank 20 be released during the time the A chain is being drawn into the magazine 14'of the housing 10, the chain will not freely pay out even though a heavy load be applied thereto for as soon as out of the housing thel shaft 17 will be rotated andthe hand crank 20 will be reverselyrotated with the shaft 17. This movement of the hand crank 20 causes the pawl 46 to the chain starts to pull turn the controll plate 41 so as to disengage l the lug 40 from the lip 39 Yof )the pawl 35' whereupon the spring 37 at bnce forces the pawl 35 into engagement with the teethv of the sprocket to lock the same against reverse movement.

' it is only necessary to grip `the handle member 20a of the crank 20 while the hand crank is reversely rotated for such gripping of the handle lmember will depress the operating member 50 nso as to dis teeth 45 of the engage the pawl 46frcm.

control plate 41"and permit the lug 40 to engage the lip 39 andto holdthe locking pawl 35 out of engagement with the teeth of the sprocket 1S. v

If it is desired to permit v the chain to'pay out in order to limit the movement of the; control plate 41 andfj'also the movement of thehandprank in theY reverse direction to the extent necessary' torelease the p'awlv a fixed ratchet wheel 55 is secured to the gear casing 16. This ratchet wheel y55 is' of annular form and a guide flange 56 integrally formed with the plate 41 coactswith the opening of this annular ratchet wheel 55 to constrain the plate 41 to proper -movement. .The ratchet /wheel 55 has substantially the saine circular measurements as the plate 4l although the ratchet wheel 45 is somewhat heavier in its construction. 15l

The pawl 46 is of suiiicient width to coact with the ratchet Wheel 55 as `well as with the -teeth ofthe plate 41. The teeth of the ratchet wheel are spaced a sufficient distance from eachl othery about the periphery Aof the wheel 55 to permit the pawl 46 to actuate lthe release plate 41 before it engages any teeth on the ratchet wheel 55. vIn assembly the teeth '45 are staggered with respect to the teeth of the wheel 55 as clearly shown in Figure 4l andthe pawl V46 is normally engaged with these teeth 45 and does not en gage t-he teeth ofthe ratchet wheel 55 until the plate 41 has been moved to such position as to release the pawl 35.

A hook is swivelly connected to the housing 10 by means of an enlarged head 61 rotatably fitted in a socket 62 provided on the housing 10. The head presents a shoulder 63 which engages with a wall of the socket 62 to prevent the hook from being pulled from the socket. It will nowbe understood that there is provided in this manner a pivotal mounting Afor thejhousing and it is proposed to provide also means for locking said housing in apredetermined position upon said pivotal mounting. For this latter purpose the head 61 has afplurality of slots 65 formedV in its periphery, four` slots yat angular intervals of 90 pref-L erably being provided. A latch 66 is ypivotally mounted on the' housing 10, as indi'- cated at 67, the housing being recessed to permit thel latch tol partake of its operative movements.` This latch 66 is selectivelyenageable with the slots 65 of the head 61 to ook the housing in a predetermined position upon its pivotal mounting. A spring 68 is provided for urging the latch into engagement with the slots of the head. Of course the latch may be manually released when it is desirable for the housing to piv' ot or swivel on its support.

A hook 70 .is swivelly connected to the chain 15.

The'chain hoist which constitutes the resent invention may be readily 'carried rom place to place and may be suspended from any suitable support by the hook 60. The hook 70 may be readily connected to the object to be elevated or to be pu1led.

A powerfulpull may be imparted to the chain 15 by rotating the hand crank 20 and nected to the hook 6 1 may be readily lowered or paid outlay moving the hand crank 20 in a' direction to pull the, load upwardly a slight'dist'ance and then permit the hand crank to move in a reverse direction while gripping the handle member 2Oa thereofso as to swing the operating member 51 about its pivot 52 to provide for the action herein above described., The chain when drawn into the housing coils itself inthe magazine thereof and is not liableto become entangled. At the saine time the chain readily pays'out. Before gripping the handle member 20a and reversely rotating the same it may be necessary to rotate the same forwardly to a slight extent that is in a direction such as to throw the pawl 35 to disengaged position.

I claim:

1. In a chain hoist, a housing having spaced walls defining a magazine, said housing also having a guide leading into the magazine, a chain extending through` the guide into the magazine, and means coacting of a pair of similar parts having curved outlined and substantially flat side walls and offset parallel flanges secured together, the side walls and the peripheral flanges of the .housing defining a magazine, the housing also having a guide leading into the magazine, a chain extending through the guide into the magazine and means coacting with thechain for` drawing Athe saine into the magazine or controlling the paying out thereof, the side walls and the flanges of the housing coacting with the chain to cause the same to automatically and nonentanglingly arrange itself when drawn into the housing.

3. In a chain hoist, a shaft, a sprocket wheel fixed to the shaft, a completely rotatable and reversible hand crank having` a pawl and ratchet connection with the shaft for rotating the same in one direction, and means independent of the pawl and controllable from the hand crank for preventing reverse movement of the sprocket wheel.

4. In a. chain hoist, a. shaft, a sprocket wheel fixed to the shaft, a hand crank having apawl and ratchet connection with the shaft for rotatin the same in one direction, means controllab e from the hand crank for preventing reverse movement of the sprock-l liu4 et wheel and including aY locking pawl cooperable with the sprocket Wheel for prieventin'g reversemovement thereof, said lock- 1 ving pawl having a camming surface vwith 5' 7whichrfthe teeth of the sprocket coact to throw/fthe locking pawl away from the sprocket when the sprocket `islbeing vrotated forwardly, aspring actuated control plate having. a. lng engageable Iwith the locking lpawl to hold the same disengagedand means carried by the hand crank'l and cooperable with the control plate for 'shifting the-same so as to disengage theL lug from' the locking -paWl "when the hand crank is reversely ro- 5. In a chain ghoist, 'a shaft, a sprocket Wheel fixed to the shaft, a hand crank having a -pavvl' and ratchet 'connection with the shaft for rotating the same inone direction,

a locking pavvl cooperable with the sprocket Wheel .for preventing reverse` movement thereof, said locking paw] having a camming surface with which the teeth of. the sprocket coact t-o throw theqlocking pawl awayu from the sprocket when Athe latter is being rotated forwardly, a spring-actuated control plate having a lug cooperable with thejlocking pawl to hold the same disengaged, said control plate having peripheral ratchet teeth, aI pawl carried'by the hand crank and cooperable with the teeth of the controlv plate, -a spring for urging thefpawl into engagement with the teeth 'of the control plate, manually operable means carried by vthe hand crank -for disengagingthe pawl from the control plate, and a fixed ratchet connected to the housing for limiting the move: ment ofthe control plate and pawl, .y 6. In a Vchain hoist, a shaft support, a 40 shaft rotatable therein, a sprocket Wheel fixed to the shaft, a hand crank having a pawl and ratchet connection with the'shaft for rotating the latter "in one direction, means independent of the pawl inall ,phasesv of the operationand controllable from the hand crank for. preventing reverse movement of the wheel. 1

7. In a chain hoist, the combination of a magazine having a pair of spaced wall 'ofv able by saidinag'azine in non-entangling rechain` `width spacing, and a chain' receive'.

lation for self-positioning therein independent of themagazine position. v

8. In a chain hoist, the combination of a magazine having a pair of spaced walls of` 'chain width spacing, a chain receivable byl lsaid magazine in non-entangling relation for .self-positioning therein independent of the magazine position, a pivotal support for said magazine eccentric of the same, and means for locking said magazine to said pivotal support in adjusted position.

9. In a chain hoist, a shaft support, a shaft rotatably supported thereby, a handle, an operating element thereon, a vone-,65 way driving co/nnectionbetween said@ ope/r-` ating element and the shaft, a single means for preventing reverse rotation of the shaft with ref-:peet to the support andthe handle, and `releasing means independent of said one-Way driving connection in all phases of t the operation for lreleasing said single means.

10. In a chain hoist, a shaft, an operating element therefor, a pawl and ratchet connec- 7,5

tion between the operating element and the wshaft, means for preventing reverse movement of the shaft, and releasing mechanism i independent of the paWl and controllable from the said operating element. 11. In a chain hoist,l a shaft, an operating element therefor, a one-vvay driving connection between theshaft and the operating element for rotating the ,same in one direction, means for preventing reverse movement f the shaft, said operating element having a handle member, and a grip-controlled releasing mechanism carried by said handle member' and engageable with said means -for releasing the same.

' 12v. In-a chain hoist, a shaft, a sprocket wheel fixed to the shaft, an operating element for the shaft, a one-Way driving connection between the operating elementandI the shaftga locking paWl cooperableyvith the 'sprocket wheel for preventing reverse rotation) of the shaft, and releasing mechanism fonsaid locking paWl controlled from said @operating element independent of the position thereof.- FREDRICK W. COFFING.

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