US1653179A - Lifting jack - Google Patents

Description

I. V. K. HOTT LIFTING JACK Filed Ja n.2l, 1925 3 Sheets-Sheet 1 INVENTOR.

[0/1 M K. H T

A TTORNEY Dec. 20, 1927. 1,653,179

I. v. K. HOTT LIFTING JACK Filed Jan.2l, l925 *Sheets-Sheet 2 INVENTOR.

fan KA. k07'7" A TTORNEY Dec. '20, 1927. 1,653,179

I. V. K. HOTT LIFTING JACK Filed Jan.2l, 1925 3 Sheets-Sheet 3 IN V EN TOR.

A TTORNEY rigidly secured to and preferably formed integral with the shaft. This collar is connected with the brake member by means of keys 28 so that the brake member will be caused to rotate with the shaft and to move longitudinally therewith. The worm 20 is loosely mounted on the shaft 21 so that it may have rotatory and axial movement with relation thereto. hen the worm wheel 19 is rotated by the screw 5 upon the downward movement of the load it will impart to the worm 20 an end thrust toward the brake member 24 and this thrust will force the brake member into firm frictional contact with the cooperating friction surface 25 and thereby hold the worm wheel and screw against further movement. This holding device is constantly operative and will instantly check the reverse movement of the load between the successive operations of the operating lever on the shaft 15. When the worm 19 is rotated in a forward direction by the; rotation of the shaft 15, by means of the operating lever, the end thrust imparted to the worm 20 will move the worm in the opposite direction and will release the same for rotation with the worm wheel. In the present instance, the worm is formed separate from the brake member 24 and the ad jacent ends of the worm and brake member are provided with cooperating clutch teeth 29. The end thrust imparted to the Worm by the forward movement of the worm wheel 19 will disengage these clutch teeth to permit the worm to rotate relatively to the shaft 21 and the brake member. To reduce to a minimum the frictional resistance to the rotation of the worm I have interposed between the end thereof and the bearing 23 an anti-friction endthrust bearing 30 with which the end of the worm will contact when it is moved to the right. in Fig. 2,. by the forward movement of the worm wheel 19. It willbe apparent, therefore, that when the lifting mechanism is operated to elevate the load. the worm 20 will rotate freely with the worm wheel 19 and will offerno appreciable resistance to the operation of the mechanism, but as soon as the operation of the lifting mechanism is interrupted the weight of the load will impart a reverse movement to the worm wheel 19 which will cause the worm to be instantly connected with the brake mem ber 24; and this brake member firmly seated against its cooperating brake member, thus instantly locking the worm against rotation and thereby locking the load against down-. ward movement.

When it is desired to lower the load the brake member 2a is moved to an inoperative position but its connection with the worm 20 is maintained so that this worm cannot be rotated with relation to the shaft 21 by the reverse movement of the worm wheel 19. This is accomplished by imparting axial movement to the shaft 21 and to this end I member 24 into an inoperative position.

Movement is imparted to the sleeve 31 by means of a crank or handle 35 which is mounted thereon and as here shown this handle is mounted on a pin or shaft36 mounted iii-lugs 37 formed integral with the sleeve 31 so that it may be moved into an inoperative position, as shown in Fig. 2, when not in use. In order to retain the handle in either its operative or its inoperative position the hub portion 38 thereof is provided with two re *esses 39 spaced apart and adapted to receive a detent, In the present device, this detent is in the form of a plunger 4:0 slidahly mounted in lugs 37 pan allel with the. axis of the handle and having an enlarged portion 41 which may be moved into and out of the recesses 39. of the plunger opposite the enlarged portion all thereof extends through a hollow boss 42 forming a part of one of the lugs 37 and has mounted thereon a head 43 between which and the lug is coiled a spring 4% which tends to move the enlarged end of the plunger into its operative position. The pressure of the thumb upon the head L3 will move the plunger against the tension of the spring 44; and disengage the detent portion thereof from the hub of the handle. The recesses 39 in the hub of the handle are so arranged that one of them will be in line with the detent when the handle is in its operative position and the other will be in line with the detent when the handle is in its inoperative position. To insure the release of the shaft and brake member from. the sleeve 31 the hub of the handle is provided with an inclined or cam surface 45 which is arranged. to engage the pin 83 when the handle is moved to its inoperative position and to thus shift the pin to the inner end of the helical slot Yhcn the handle 35 is in its folded or inoperative position as shown in Fig. 2, it lies hack of 2: lug 46 on the frame or hearing in which the shaft 21 is journaled and thereby locks the shaft against movement in a lowering direction and positively prevents the lowering of the load until the handle has been moved into an operat ve position.

'lhe operation of the device will be readily understood from the foregoing description and it will be apparent that when the lift That end Hit) llll

lower "the 10- thtifrm "thereby tioh of sttid'cfahk tbifendefleztiti make mend tiptin the downward move-- vtfien t ojf the 1 Ld fa sh 3 ft, h brake enhheeted shaft, nieehiijg with said .Voi'n'twmeel and I rtiigi'ed that the evil thiusrt imparted "1 hfdkebherh 'e', "a handle "for 'rbtetinf; $22 It! shaft "a ntl stud mi-m; iii '11 direetio'n to lower thei 10%.!!! "andf c pablqiist :1 limited '4. In a liftihg jtckg the combination with a. lifting element, hhd meafis 'for actuating:

the Same to'eleva'te a load, 'oft'a, worm Wheel tiiih "thereby hpbji' the dowllwztrd m nven lent (if the 102th esheft, a b'rzike'cohnected with Said Shaft, h Wfntmfinqhnted 0n Said shaft,

jh'e'shing with 'said worm Wheel a'ncteo arfainged that the end thrust imparted thereto bye'ai Wbiin Wheel will 'ren'dei Said brake Opeiatiw'e n'handle rotatable "about the axis of saidehaft, and means controlled by said g. ivorm in '3 direetibh to handle to tendersaid brake iiio pe rati've and said pin and said the same to elevate a load, of a worm wheel connected with said lifting element for rotation thereby upon the downward. movement of the load, a shaft, a worm mounted on said shaft and meshing with said worm wheel, a brake member mounted on said shaft and arranged to be moved into an operative posi tion by the end thrust imparted to said worm by said worm wheel, and means supported by said shaft for moving the same longitudinally to render said brake member in operative. p

r 6. In a lifting jack, the combination with a lifting element, and means for actuating the same to elevate a load, of a worm wheel connected with sei l lifting element for rotation thereby upon the downward movement of the load, a shaft, a worm mounted on said shaft and meshing with said worm wheel, a brake member mounted on said shaft and arrangedto be moved into an operative position by the end thrust imparted to said worm by said worm wheel, an operating handle mounted on said shaft, means connected with said handle to impart axial movement to said shaft upon the initial movement of said handle and to then rotate said shaft.

7. In a lifting jack, the combination with a lifting element, and means for actuating the same to elevate a load, of a worm wheel connected with said lifting element for rotation thereby upon the downward movement ofthe load, a shaft, worm mounted on said shaft and meshing with said worm wheel, a brake member mounted on said shaft and arranged to be moved into an operative position by the end thrust imparted to said worm by said worm wheel, a sleeve mounted on said shaft and having a helical slot, a pin carried by said shaft and extending into said slot, and a handle connected with said sleeve.

8. In a lifting jack, the combination with a lifting element, and means the same to elevate a load, of a worm wheel connected with said lifting elementfor rotation thereby upon the downward movement of the load, a shaft, a worm mounted on said shaft and meshing with said worm wheel, a brake member mounted on said shaft and arranged to be moved into an operative position by the end thrust imparted to said worm by said worm. wheel, a sleeve mounted on said shaft and having a helical slot, a pin carried by said shaft and extending through said slot, and a handle connected with said sleeve, said handle being pivotally mounted on said sleeve and having means to cause sleeve to have relative movement when said handle is moved about the axis of its pivotal connection with said sleeve.

9. In a lifting jack, the combination with a lifting element, and means for actuating the same to "elevate a load, of a worm wheel connected with said lifting element for rotafor actuating tion thereby upon the downward movement of the load, a shaft mounted for both rotatory and axial movement, a brake member rigidly secured to said shaft, a worm mounted on said shaft for both rotatory and axial movement with relation thereto and meshing with said worm wheel, means controlled by the axial movement ofrsaid worm to connect it with said shaft when said worm is moved in one direction and to disconnect theworm from the shaft when the worm is moved in the other direction, and means for imparting axial. movement to said shaft to render said brake member inoperative.

10. In a lifting jack, the combination with a lifting element, and means for actuating the same to elevate a load, of a worm wheel connected with said lifting element for rotation thereby upon the downward movement of the load, a shaft mounted for both rotatory and axialmovement, a brake member rigidly secured to said shaft, a worm slidably and rotatably mounted on said shaft and meshing with said worm wheel, the adjacent ends of said worm and said brake member having cooperating clutch faces, and means for imparting axial movement to said shaft.

11. In a lifting jack, the combination with a. lifting element, and means for actuating the same to elevate a load, of a worm wheel connected with said lifting element for rotation thereby upon the downward movement of the load, a shaft mounted for both rotatory and axial movement, a brakemember rigidly secured to said shaft,- a worm slidably and rotatably mounted on said shaft and meshing with said worm wheel, the adjacent ends of said worm and said brake member having cooperating clutch faces, a member rotatably mounted on said shaft, said member and said shaft having parts cooperating to impart axial movement to said shaft when said member is rotated in one direction, and means for actuating said member. 7

12. In a lifting jack, the combination with a lifting element, and means for actuating the same to elevate a load, of a worm wheel connected with said lifting element for rotation thereby upon the downward movement of the load, a shaft mounted for both rotatory and axial movement. a brake member rigidly secured to said shaft, a Worm slidably and rotatably mounted on said shaft and meshing with said worm wheel, the adjacent ends of said worm and said brake member having cooperating clutch faces, a sleeve rotatably mounted on s'aidshaft, held against axial movement in one direction and having a helical slot, a pin mounted on said shaft and extending into said slot, and a handle connected with said sleeve.

13. In a lifting jack, the combination with lifting element, and means for actuating the same to elevate a load, of a worm Wheel connected with said tation thereby uponth'e downwa-rd move ment of the load, a shaft mounted for both rotatory and i axial movement, a brake member rigidly secured to saidshaft a worm slida-bly and rotatabl mounted on said shaftand ineshing With said worm wheel, the adjacent ends of said worm and said brake member havingcooperating clutch viaees, a

sleeve rotatablymounted on said shaftyheld against axial movements in one}.direetion and having a helical slot, a, 'pin mounted :on :said shaft a nd extending flute said slot,

, a-hand-le pivota-llymounted on said sleeve on van axis transverse to the axis of said shaft,

and neans for ;-retaining said handle in either of two positions with relationto said Vs've. n

ll i-Inza-lil ting. ack, the combination with elevatealload, of a worm wheel connected with said lifting element for .frov tation thereby upon the downward movement of the load, a shaft mounted "for {both rotatory and axial movement, a fbrake member rigidly secured to said shaft, a worm slid-ably and,rotatably mounted on aid-shaft and meshing .with usaid worm wheel, the adjacent ends "of said brake I I clutch faces, a sleeve rotatablymountedon said shaft, held against axial movement in one direction and having a helicalslot, a, ,pin -inounted on said I through said slot, a handlepivotally mounted on said sleeve, on an axis extending transversely to the a'xis of said -s1eeve,jsaid handle having a part recesses, and a plun'ger yieldably; mounted eitherof said recesses.

, adapted to enter one of on said sleeve for, movement into andjefit of 15., In a lifting aek the combination 7 "cans for actuating the same to elevate a load, of; a worm :wheel,

connected with said lifting eleinent fffor rotat-ion {thereby upon the downward moveber rigidly secured tojsaid Shaft/it worm and meshing with said acentends of member having worm wheel, the adsaid worm and {sa d brake cooperating fclutoh faces, a

sleeve rotatably 'mounted' on said shaft, held against axial movement in one direetiona-nd having a helical slot, a pin mounted on said shattand extending through said slot, at handie ,pi'votally mounted on said sleeve on an axis extending transversely to the axis of said sleeve, said handle having ahub ,portion provided with slidably mounted on said sleeve adjaeen't to said hub and having hub, a spring tending to ,move said enlifting element for ro brakes member having w an operating shaft said worm and, member having; cooperating said shaft, wheel and shaft and extending ;said worm withv said brake =proviqhed with l'oc'kmg said a1n,-a ment of the load, ashaft mounted for both rotatory and axil movemen't, a brake niem- K V I V bevele slidably and rotatablymounted onsaid shaft separated recesses, a plunger,

an enlangec'l portion the recesses in said larged portion of, said plunger into said flrecess, said plungerhaving means for moving the same against the action of said spring to release said hub.

l6. Ina lifting jack-,the combination with ffltatory and 4' axial movement, a brake member. FTIglCllY, secured to said shaft, a worm slid ably and rotatably mounted on I said shaft and meshing with the, adjacent ends of said worm and :said 7 cooperating -clut ch taces a sleeve rotatably mounted on said shaft, held-aga nst axial movement in one A 7 direction and having ahlicalslot, "a ,pin t ll ting element, andmea nsgfor (actuating thesarne to mounted on said shaft and extend ng through said slot, and a handle 'gpivotally mounted on said sleeve on an axis transverse to the axisot' said sleeve andhaving a oam-shaped portion said pm when handle directionaboutits axis; n g In a liftin yljackja lifting element,

connectedwith said liftingeiement for rotation in either direction tzherebyga worm wheel rigidly secured to a worm meshing with said worm -ea tpable of a limited axial :moveanent, abrake ;member adapted 'to be connected with or-disconnected from said worm,

means controlled the end thrust imparted i to said worm by worm wheel to connect member andto ;-render said brake member operative, and means for i nparting axial movement to both said worm and said brake member to rendersaid brake member inoperative. T ith v 7 18. in a lifting ,jack, a barse astandard rising -f-rom said base,,-a= ram sii dably mounted in. said standard, a nut carried by screw rotatably mounted on said baseand operatively engaging said nut, a beveled E g-"ear rigidly fOOIlZlQCiQCl with said sorewya'beve-led pinion meshing with said 01 gear, a gear-rigidly connected with saidgpini'on, a ,pinion meshing with the last- ;inentioned gear, means ior actuating said pinion, a worm .wheelrigidly connected with said pinion, a worm meshing with-saidworm wheel, a brake member, means'controlled by the end thrustim-parted to said worm by Worm wheelto connect the same with and disconnect the same ifronrsaid brake member and to render said brake member operative, and means forgimparting, axial movement to said worm and saidibrakeinein her to render the brake 'member inoperative but retaining a connection between the same and the worm r n 19'. In a lifting deck, a base, a standard rising from said base, a ram slidably wornrwheel,

arranged to engage is moved in one said shaft and mounted in said standard, a nut carried by said ram, a screw rotatably mounted on said base and operatively engaging said nut, a beveled gear rigidly connected with said screw, a beveled pinion meshing with said beveled gear, a gear rigidly connected with said pinion, a pinion meshing with the last mentioned gear, means for actuating said pinion, a worm wheel rigidly connected with said pinion, a shaft extending transversely to the axis of said worm wheel and mounted for rotatory and axial movement, a brake member rigidly connected with said shaft, a worm rotatably and slidably mounted on meshing with said worm Wheel, said worm and said brake member having cooperating clutch faces, and an operating member connected with said shaft for imparting axial movement thereto to render said brake member inoperative and for rotating the same to actuate said worm.

20. In a lifting jack, the combination with a lifting element, and means for actuating the same to elevate a load, of a worm wheel connected with said lifting element for rotation thereby upon the downward movement of the load, a-worm meshing with said worm wheel and capable of axial movement, a brake member actuated by the axial movement of said worm to prevent the rotation thereof, means for moving said brake member into an inoperative position and for rctating said worm in a direction to lower the load on said lifting element, and means for positively locking said worm against rotation in a lowering direction.

21. In a lifting jack, the combination with a lifting element, and means for actuating the same to elevate the load, of a worm wheel connected with said lifting element for rotation thereby upon the downward movement of the load, a worm meshing with said worm wheel and capable of axial movement, a brake member actuated by the axial movement of said worm to prevent the rotation thereof, a lowering crank, means controlled by the rotation of said crank to render said brake member inoperative, whereby said worm may be rotated and the load lowered. and means controlled by said crank to positively lock said worm against rotation in a lowering direction.

22. In a lifting jack, the combination witha lifting element, and means for actuating the same to elevate a load, of a worm wheel connected with said lifting element for rotation thereby upon the downward movement of the load, a shaft, a brake con,- nected with said shaft, a worm mounted on said shaft, meshing with said worm wheel and so arranged that the end thrust imparted thereto by said worm wheel will render said brake operative, a handle connected with said shaft and capable of a limited rotation about the axis thereof, means controlled by a lifting element, and

said handle to render said brake inoperative, said handle being movable'about an axis transverse to said shaft into an inoperative position, and means cooperating with saidhandle when the latter is in an inoperative position to hold said shaft positively against rotation in a lowering direction.

23. In a lifting jack, the combination with means for actuating the same to elevate a load, of a worm wheel connected with said lifting element for r0- tation thereby upon the downward movement of the load, a shaft mounted for both rotatorya nd axial movement, a brake member rigidly secured to said shaft, a worm slidably and rotatably mounted on said shaft and meshing with said worm wheel, the adjacentvends of said worm and said brake member having cooperating clutch-faces, a sleeve rotatably mounted n said shaft, held against axial movement in one direction and having a helical slot,a pin mounted on said shaft and extending into said slot, a handle pivotally mounted on said sleeve on an axis transverse to the axis of said shaft, means for retaining said handle in either of two positions with relation 'to said sleeve, and a fixed stop to engage said handle when the latter is in one of said positions to hold said handle and sleeve against movement in a lowering direction.

24:. In a lifting jack, the combination with a lifting'element, and means for actuating the same to elevate a load, of a deviceto control the downward movement of said lifting element comprising a brake, a movable member. to render said brake operative, means for connecting said movable member with'said lifting element to cause the former to be moved in a direction to set the brake by the downward movement of said lifting element, and manually operated means for moving said movable member against the action of said lifting element to relieve the pressure on said brake and for actuating said movable member to permit of the downward movement of said lifting element. 25. In a lifting jack, the combination with a lifting element, and means for actuating the same to elevate a load, of a device to control the downward movement of said lifting element comprising a brake, a movable member to render said brake operative, means for connecting said movable member with said lifting element to cause the former to be moved in a direction to set the brake by the downward movement of said lifting element, and a single device for moving said movable member against the action of said lifting element to release the pressure on said brake and for actuating said movable member to permit of the downward movement of said lifting element.

26. In a lifting jack the combination with a lifting element, and means for actuating the same to elevate a load, of a device to control the downward element comprising ber to render said i) for connecting said movement ofsaid lifting a brake, a movable membrake operat1ve,- means t to (illOll ement of saidlifting el movable member with cause the formerto to set the brake by ment, and a handle connected with said mo"- able member for moving the same against 10 the action ofsaid lifting element to relieve the pressure on said brake. g

In testimony whereof, I afiix my signature hereto. I

. ION v, K. HOTT.

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