US921234A - Lifting-jack. - Google Patents

Description

F. L. GORMLEY & B. B. TERRILL. LPTING JACK. APPLIGATION FILED 11017.14, 190s.

921 ,234.. Patantea May 11, 1909.

2 SHEETS-SHEET l.

lwenors: Fzasses: E'ankllormle@ LIFTING JAGK.

PrLIoATIoH. FILED 1:0114, 1908.

'Patented May 11, 1909.

2 SHEETS-SHEET 2.

' Inventors.- EanizLGormley,

erm'. ZrrL,

UNITED STATES PATENT OFFTOE.

FRANK L. GORMLEY, OF BOSTON, AND BER-NICE B. TERRLL, OF WINTHROP, MASSACHSETIS.

LIFTINe-JAGK.

Specification of Letters Patent.

Application led November 14, 1908.

Patented May 11, 1909.

Serial No. 462,713.

To all whom it may concern:

Be it known that we, FRANK L. GORMLEY and BERNIGE B. TERRILL, citizens of the United States of America, and residents of respectively, Boston and Winthrop, both in the county of Suffolk and State of Massa-v chusetts, have invented certain new and use* ful improvements in Lifting-Jacks, of which the following is a specification.

This invention relates tolifting jacks and particularly to that class of oints known as ratchet screw jacks and it has for its object the provision of a looking mechanism which is adapted to elfectually retain therjack in raised position under a load, this locking mechanism being so constructed as to be temporarily released to effect a lowering of the jack when the operating lever is manipulated under certain conditions.

The invention consists in certain novel features of construction and arrangement of parts which will be readily understood by reference to the description of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents a horizontal, section of a jack embodying the features of this invention, the cutting plane being on line 1 1 on Fig. 2 looking in the direction of the arrow. Fig. 2 representsV a vertical section of the same, the cutting plane being on line 2 2 on Fig. 1 looking in the direction of the arrow. Fig. 3 represents a vertical section through the operat ing lever and ratchet mechanism, the cutting plane being on line 3 3 on Fig. 1 looking in the direction of the arrow. Fig. 4 represents a horizontal section on line 4 4 onv Fig. 2 looking in the direction of the arrow. Fig. 5 represents an enlarged vertical section, the cutting plane being on line 5 5 on Fig. 1, looking in the direction of the arrow. Fig. 6 represents an enlarged vertical section, the cutting plane being on line 6 6 on Fig. 1 looking in the direction of the arrow. Fig.

. 7 represents a partial longitudinal section,

the cutting plane being on line 7 7 on Fig. 5, looking in the direction of the arrow, and Fig. 8 represents a longitudinal section, the cutting plane being on line 8 8 on Fig. 6 looking in the direction of the arrow.

Similar characters designate like parts throughout the several figures of the drawings.

In the drawings, 10 represents a hollow standard provided with an enlarged base portion 11. To the exterior periphery of the standard 1() is fitted a sleeve 12 capable of being vertically moved on said standard 10, the shoulder 13 of the base 11 of the standard 10 limiting the movement of said sleeve in one direction while a stop latch 14 pivotally mounted upon said sleeve 13 with one end extending through a slot. therein and adapted to engage an annular stop groove 15 cut into the periphery of the standard 10 limits the movement of the sleeve 12 in the opposite direction.

The upper end of the standard 10 is provided with a nut 16 to which is threaded the screw 17 to the upper end of which is keyed a bevel gear 19 meshing with another bevel gear 20 formed on or secured to a lateral shaft 21 extending through a bearing 22 formed upon a removable plate 23 secured to the head 24 screwed or otherwise fastened upon the upper end of the sleeve 12.

lt is obvious that by the rotation of the shaft 21, the screw 17, through the medium of the gears 19 and 20, dll be moved about its aXis in the nut 16 causing the head 24 with its sleeve 12 to be raised and lowered relative to the standard 10. The lifting jack set forth in the foregoing description is of common construction, the present invention being limited to the method of operating the revoluble shaft 21 and locking it to prevent accidental movement when the jack is supother or lower end. An annular ring 26 is fitted to the periphery of the bearing 22 and is adapted to cover the slot 25 and revolve about the'periphery of said bearing. This annular ring is provided with a series of gear teeth 27 which mesh with an intermediate gear 28 revoluble about a stud 29 screwed into the bearing 22. Upon the shaft 21 beyond the outer end of the bearing 22 is revolubly mounted a gear ring 30, the teeth 31 of which mesh with the teeth of the intermediate gear 28. This annular ring 30 is also provided with a series of peripheral ratchet teeth 32, one face of each of which is cut away, as shown in the drawings.

On the reduced ends of the shaft-21 isV mounted a forked lever 33,. S21-id lever :being freely movable about the axis of said shaft. Between the arms of the bifurcated end-sof the lever 33 is a ratchet member 34 keyed or.. otherwise securedk to the shaft 214,. Thel forked lever or member 33 isprovided with a pair of radial ears 35 in which ismounted a pin 36 supporting a reversible pawl member 37 This-member 37 is normallyi-n the position shown in Fig. 3 and is retainedin this position -by means of the bolt 3S lmounted in a socket 39 'in the member 33, said bcltbeing-v pressed outwardly by means of a spring-40 so that the V-shaped end ofthe bolt engages with one -of the inclined faces-on the end of the pawl 37.

The bolts or locking member 38 is prevented from turning fin its socket by meansofthe screw 41 extending into a groove ex-y tending Ylongitudinally-of said bolt.

In thel position shown in Fig. 3, the forli-ed member 33 isprovided with a suitable socket in which is mounted the operating handle 42. When the various parts are inthe positionv indicated iii Fig. 3, an up-and-down or pump-- handle motion imparted to the operating-learrow the ball 43 will be raised into the wide-rV part of the slot 25 into the position shown -in dotted lines in said Fig. 5, thus permitting a free movement of said shaft- 21.

rlhe side walls of the slot 25 are-inclined toward each other as they approach the shaft 21, as indicated clearly in Fig. 7, so that when the shaft is removed Ifrom its bearing 22 the ball 43 willnot become displaced. As soon as the rotation of the sha-ft 21y (in the direction of the arrow on Fig. 5 of the drawings) ceases the ball 43 will drop into a narrower part of the slot 25 and-become firmly impinged upon the periphery of the shaft21 and the inner wall of the annular ring 26, thereby locking the two members- 21-26 together so that the shaftv cannot be moved in a direction-opposite to that indicated by the arrow on Fig- 5. itl is obvious therefore-that should there be any tendency, owing to the excessive weight-upon the jack.,

ing device which prevents the jack-freni accidentally lowering when supporting an;

excessive weight. In order, however,- to

secure a lowering of the jack when desired,vl

the pawl 37 is provided with a lateral tooth 44.which may be made to engage with the Aperiti-1.eral,tenir-32..iff-the ring 30. .When-the.

movement ofthe-ring 30 by means-:of theintermediate gear 23 -will cause the Aring-26 to be moved-in the direction indicatedby the arrow-on-Fig. 5 of the drawings and when the ring 26 is` thus moved the ball-43 will-be lifted in-the fwider-part-of the slot-25, that isi into the position indicatedin ydotted lines-in Fig. 5,v thus-:releasing its impinging action upon the shaft 21 and-permitting ythe end 46- of the pawl to act on the ratchet-wheel 34 to move -the shaft 21- in fa direction--opposite to that indicated by the-arrow--onFi'g 5 andv cause such'a rotation of the screw-17 in the nut 16 which rwillilower the head 24-relative to the standard-10. v

By yconstructing lifting-jacks of this class in the manner described, the accidental-- lowering-of the head 24- on the standard 10 by an excessive load-placed-thereon -iswhol-ly obvia-ted -whilef at the -same 'time the load-: may be lowered at ithe -will ofi-the operatorl without difliculty.

It is believed that fromthe foregoing-the operation and many advantages ofthe invention will vbe-fully understood without further description.l

Having-thus described our invention,we claim:4

1. Ina lifting-jack,- the combination of-a stationary member-gv a movablel -memberthereon; means for operating said movable` member including a -lateral shaft; -a ringfreely --revoluble about said shaft and operable with said operating means when lower-A ing said movable -membergand a-membei' interposed between said ring and shaft adapted to grip the latter underabnormal conditionsto prevent the rotation of said shaft.

2. In a lifting jack, the combi-nation of a stationary member; a movable member thereon; meansfor operating -saidmov-able member including -a lateral-shaft, a bearing for said shaft provided with a 4pocket deeperv at lone end than the other; a-ring---freelyv revoluble' about said-bearingand 'operated by the lowering movement of said operating means; and a member-in said pocket interposed betweensaid ring-and shaft adapted to grip the latter under-abnormal conditions to prevent the rotation of said shaft.

3. In a lifting jack, the combination of-a stationary lmem-ber;

a movable; member thereon-5V means for-operating said 'movable 91er', asia member including alateral shaft; a clutch member engaging said shaft adapted' tov pref' vent the accidental lowering of said movable member; an annular ring revoluble about an axis eccentric to the axis of said shaft; a ro# tatable member interposed between said ring and shaft and normally adapted to impinge upon said shaft; and means controlled by the lowering of said operating means for moving said ring to release the impinging of said rotatable me'inber on said shaft.

4. ln a lifting jack; the combination of a stationary member; a movable member thereon; means for operating said movable member including a lateral shaft; a ratchet secured to said shaft; an oscillating member on said shaft; a pawl on said member for operating said ratchet; a bearing for said shaft provided with a slot extending from its periphery to its bore; said slot being deeper at one end than the other; a ring surrounding said bearing and covering said slot; a rotatable member within said slot and normally engaging said ring and shaft; and means carried by said pawl for moving said ring about said bearing when desired.

5. In a lifting jack; the combination of a stationary member; a movable member thereon; means for operating said movable member including a lateral shaft; a ratchet secured to said shaft; an oscillating member on said shaft; a pawl on said member for operating said ratchet; a bearing for said shaft provided with a slot extending from its periphery to its bore; said slot being deepen at one end than the other; an annular gear ring surrounding said bearing and covering said slot; a rotatable member within said slot and normally engaging said ring and shaft; a second annular gear revoluble on said shaft and provided with peripheral teeth; a gear interposed between said annular gears and meshing with both; and means carried by said pawl for engaging said peripheral teeth.

6. In a lifting jack, the combination of a stationary member; a movable member thereon; means for operating said movable member including a lateral shaft; a ratchet secured to said shaft; an oscillating member on said shaft; a pawl on said member for operating said ratchet; a bearing for said shaft provided with a slot extending from its periphery to its bore; said slot being deeper at one end than the other; an annular gear ring surrounding said bearing and covering said slot; a rotatable member within said slot and normally engaging said ring and shaft; a second annular gear revoluble on said shaft and provided with peripheral teeth a gear interposed between said annular gears and meshing with both; and means carried by said pawl for engaging said peripheral teeth during the lowering of the movable member.

7. ln a lifting jack, the combination of a stationary member; a movable member thereon; means for operating said movable member including a lateral shaft; a ratchet secured to said shaft; an oscillating member on said shaft; a double-ended pawl on said member for operating said ratchet; a bearing for said shaft provided with a slot extending from its periphery to its bore; said slot being deeper at one end than the other; a ring surrounding said bearing and covering said slot provided with an annular gear; a rotatable member within said slot and normally engaging said ring and shaft; a second annular gear revoluble on said shaft and provided with peripheral teeth; a gear interposed between said annular gears and meshing with both; means carried by said pawl for engaging said peripheral teeth; and a device ada ted to normally retain said teeth-engaging device out of engagement therewith.

8. In a lifting jack; the combination of a stationary member; a movable member thereon; means for operating said movable member including a lateral shaft; a ratchet secured to said shaft; an oscillating member on said shaft; a double-ended pawl on said member for operating said ratchet; a bearing for said shaft provided with a slot extending from its periphery to its bore; said slot being deeper at one end than the other; a ring surrounding said bearing and covering said slot provided with an annular gear; a rotatable member Within said slot and normally engaging said ring and shaft; a second annular gear revoluble on said shaft and provided with peripheral teeth; a gear inter osed between said annular gears and mes ring with both; means carried by said pawl for engaging said peripheral teeth; and a spring actuated member adapted to normally retain said teeth-engaging device out of engagement therewith.

9. In a lifting jack; the combination of a stationary member; a movable member thereon; means for operating said movable member including a lateral shaft; a ratchet secured to said shaft; an oscillating member on said shaft; a pawl on said member for operating said ratchet; a bearing for said shaft provided with a slot extending from its periphery to its bore, said periphery being eccentric to the axis of said shaft and said slot being deeper at one end than the other a ring revolubly mounted upon said bearing periphery; a toothed ring on said shaft; means carried by said pawl for moving said toothed ring about said shaft when desired; and means interposed between said rings to cause motion to be imparted from one to the other.

10. In a lifting jack, the combination of a stationary member; a movable member thereon; means for operating said movable member including a lateral shaft; a ratchet secured to said shaft; an oscillating member cause one of them to be moved in one direcon said shaft g a W1 on said member for o ption by the movement of the other in the operating said rato iet; zt bearing for said shaft provided With a slot extending from its peposite direction.

riphery to its bore, said periphery being ec- Signed by ns tt-4 Post Oiee Sq., Boston, 15 centric to the axis of said shaft and said slot Mass., this 12th day of November, 1908.

being dee er at one end than the other; a t FRANK L GORMLEY ring revo ubly mounted upon said bearing 4 periphery; a toothed ring on said sheftgr BERNIOE B' TERRILL means carried by said W1 for moving said i toothed ring about sai shaft When desired; and means interposed between said rings to s Titnesses WALTER E. LOMBARD, NATHAN C. LOMBARD.

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