US1780266A

US1780266A - Lifting jack

Info

Publication number: US1780266A
Application number: US147908A
Authority: US
Inventors: William H Lolley
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-11-12
Filing date: 1926-11-12
Publication date: 1930-11-04
Anticipated expiration: 1947-11-04

Description

W. H. LOLLEY Nov. 4, 1930.

LIFTING JACK Filed Nov. 12 92 3 Sheets-Sheet l W. H. LOLLEY Nov. 4, 1930.

LIFTING JACK 3 Sheets$heet 2 Filed Nov. 12, 1926 Jmmuto'o imam/1% @51 Mo attozneagb NOV. 4, 1930. w LOLLEY 1,780,266

LIFTING JACK Filed Nov. 12 25 3 Sheets-Sheet 3 7U uventoz Patented Nov. 4, 1930 PATENT OFFICE WILLIAM H. LOLLEY, OF NEW YORK, N. Y.

LIFTING JACK Application filed November 12, 1926. Serial No. 147,908.

This invention relates to lifting jacks of the kind which are specially adapted for raising automobiles having balloon tires, namely jacks having a low vertical height when in their collapsed condition and having a considerable height when in their extended condition.

More particularly the invention relates to lifting jacks of the lazy tong type having means associated therewith whereby the rest which is adapted to engage the Wheel axle of the automobile, is given a more or less uniform movement such that the applied force for. raising the jack during the early stages of the raising operation will not be substantially greater than that during the later stages of the raising operation when the lazy tong arrangement has been extended a considerable amount.

The primary object of the present invention is toprovide a jack of this nature which is of extremely simple construction but which is of the necessary rigidity to stand the strains to which such jacks are subjected.

A further object of the invention is to provide a jack in which the rest during the initial stage of the raising operation of the jack is supported directly on the lower levers intermediate their ends and during the later stages of the raising operation is supported upon the upper levers.

A further object of the invention is to provide an improved nut whereby a single screw operating rod may be used without such rod extending unduly beyond the lazy tong device when the jack is in its extended condition.

A further objcctof the invention is to provide improved pivots for pivotally mounting 4% the levers of the jack.

In order that the invention may be clearly understood, reference is made to the accompanying drawings which illustrate by way of example embodiments of my invention 4 and in which:

Figure 1 is a front elevation of one embodiment of the jack in its completely collapsed condition, having a double threaded operating screw;

Figure 2 is a front elevation of the jack in its fully extended condition, having a single threaded operating screw;

Figure 3 is a side elevation ,of the jack in its fully extended condition;

Figure 4 is a detail of the'screw threaded'flfi nut by which the operating screw engages with one of the pivotal points of the lazy tong device; and

-Figure 5 is a detail of one of the bearing members for supporting the operating rod.

Figure 6 is a partial cross sectional elevation of the base showing a supporting lug in detail.

In the embodiments illustrated in the draw-- ings, the lazy tong device comprises a lower pair of double levers 1 and 2 pivot-ally mounted at their lower ends respectively on the

pivots

3 and 4, and an upper pair of double levers 5 and 6 pivotally connected at their lower ends to the upper ends of the lower levers 1 and 2 by means of the

pivots

7 and 8, and pivoted together at their upper ends by means of the pivot 9.

The

pivots

3 and 4 of the lower ends of the levcrs'l and 2 are respectively mounted upon pairs of spaced

upstanding lugs

10 and 11 on the base member 12.

The base member 12 may be cast or formed by stamping from sheet metal of suitable thickness. In the latter case the base will be dished so that the bearing portion thereof will comprise an outer rim 13, and the

upstanding lugs

10 and 11 will be stamped out of the sheet metal and bent upwardly as indicated in the drawings.

If the base. member 12 is cast, the central portion thereof on which the

lugs

10 and 11 are mounted will preferably be raised above the outer rim thereof. The raising of the central portion of the base whether it is in the form of a stamping or is cast, is for the purpose of strengthening the base so that it will stand the excessive strain placed thereon in case the car, when supported upon the jack, moves forwardly, thus tiltingthe jack about the forward edge of the base portion.

In such a case the pressure exerted on the front edge of the base will be in line with the pivot 4 and if the material of the base were not raised between the front edge thereof 1m double levers, the webs 16 an and the forward edge of the lug 11, the bending strain on the portion of the base between the forward edge and the base of the lug 11 would be too great to be withstood by material of medium thickness.

It is essential in jacks of this type to provide means whereby the lower levers 1 and 2 will be moved equally about their pivots when the operating means is actuated. Any well known means may be provided for this purpose. In the embodiment illustrated one of the lower double levers such as 1 is provided with a curved cam'slot 14 in which a pin 15 mounted on the other lower double lever, such as 2, operates, the slot being shaped so as to insure equal pivotal movements of the levers 1 and 2 about their

pivots

3 and 4 when the operating means thereof is actuated. In the construction illustrated the slot 14 is of such length that a side extension 14 has to be provided on the lever 1. In order to allow of the jack being fully collapsed, apertures 14 will be provided in the base member to receive such side extensions. If the base is stamped out of sheet metal the lug 11 will be made of such width that the aperture left thereby in the base when it is bent upwardly will be of the desired size.

The double levers 1 and 2 comprise respectively spaced

side members

1, 1 and 2, 2 which are connected together respectively by

webs

16 and 17 which may be connected at their outer ends to such members by riveting (as shown in Fig. 1) welding, or the like, or may be integral with such side members as shown in Fig. 2. In the latter case the double levers with their connecting webs will be stamped out of suitable material and the side members then bent at right angles to the connecting webs.

In order to give greater ri idity to the d 1% may be bent along a longitudinal centre line so that a cross section of same would be of open V-shape.

The upper levers fraud 6 also comprise respectively, side members 5*, 5 and 6, 6 spaced apart and connected together by

webs

18 and 19 respectively which webs may be connected to the side members by any suitable means, such as riveting (Fig. 1) or may be formed integrally with such side members (Fig. 2). In order to give greater rigidity to the upper and lower levers, the

webs

18 and 19 may be bent along a longitudinal center line in the same manner as the

webs

14 and 15.

The upper levers 5 and 6 fit respectively within the upper ends of the lower levers 1 and 2, each of such upper levers fitting between the spaced side members of the corre sponding lower lever.

The rest 20 preferably comprises the spaced

side members

21, 22 connected together at their upper ends by the top 23 which is preferably integral with such side members. The said rest is mounted on said upper levers in such manner that it ma slide vertically with respect thereto and or this purpose the

side members

21 and 22 which are adapted to embrace the outer of the upper levers are each provided with a vertical slot 24 in which extensions of the pivot pin 9 are adapted to operate. In order to maintain such extensions in engagement with the vertical slots, they are preferably riveted over washers 25 mounted on such extensions.

If desired, the

members

21, 22 may be riveted to the top 23 and may extend between the side members of the inner upper lever.

The upper ends of the upper levers 5 and 6 extend beyond the pivot 9 forming

extensions

26 and 27 respectively and the upper edges of these extensions

form cam surfaces

28 and 29 respectively which are adapted during certain periods of the, raising and lowering operations of the jack to engage the under face of the top 23. The shape of such cams is such that they will impart substantially uniform vertical movement to the rest during the period they enga e the same if the operating rod is operate uniformly.

The lower portion of the rest 20 is adapted during a certain period of the operation of the jack to rest upon the

cross webs

16 and 17 of the lower levers 1 and 2 whereby the rest will be raised by said webs'during such period. The lower edges of the

side members

21 and 22 of the rest are preferably inclined at an angle corresponding to that assumed by the

webs

16 and 17 when the jack is in its collapsed condition.

In order to aid in the stabilization of the rest 20 when it is being raised on the

cross webs

16 and 17, a recess 30 is provided in the lower edge of each of the

side members

21 and 22. This recess is so positioned that the edge 31 thereof engages with the pin 15 during the period of movement when the rest is in engagement with the

cross webs

16 and 17 and the lower corners thereof are rounded so as to ensure engagement with such pin.

The operation of the jack is effected in a well known manner by means of a horizontally extending screw-threaded rod 32 which extends through

members

33 and 34 to which the outer ends of the upper and lower levers are pivotally connected and which extend between the side members respectively of the upper levers 5 and 6. The rod 32 may, if desired, be provided with right and left handed threads respectively in screw threaded engagement with the

nuts

33 and 34. If the jack is to be used for raising automobiles other than those of a light type, it is preferable to provide the operating rod 32 with a screw-thread at one end only in which case such screw-threaded end will be in screwthreaded engagement with a nut 33 and the other end of the rod will be rotatably mounted within a bearing in member 34. In such a case ball bearings 'are preferably provided between the flange 36 on the outer end of the rod 32, and the member 34 so as to insure ease of operation. There will of course be mounted on the end of the rod 32 any suitable means for connecting an operating handle to the rod, for instance one portion 37 of a universal joint.

When the screw-threaded end of a single thread operating rod engages directly in the member 33, the operating rod will extend beyond said member an inconvenient distance when the jack is raised to its fullest extent and there would be danger of such rod being bentif the jack were tilted over about its forward edge due to an accidental} forward movement of the car when resting on the jack in its raised position. In such a case if the car were provided with balloon tires it is possible that the outer end of the operating rod would engage the ground and thus help to take the weight of the car before the rim of the wheel touched the ground. In such a case a bending of the operating rod would inevitably follow.

In order to avoid this disadvantage the outer end of the operatin rod is adapted to engage within a nut 38 0 special form pivotally mounted between the outer: ends of the upper and lower levers 5 and 1. This nut is illustrated in detail in Fig. 5 of the drawings and is of hollow tubular form having an outer shaped end 39 from the side of which extensions 40 extend which form the pivots for the levers 1 and 5. The inner end 41 of the nut may be enlarged or of square cross section being connected to the outer end 39 by the tubular portion 42.

The nut may be screw threaded internally over the whole of its length though preferably it is screw threaded only at its inner end 44, the passa e extending longitudinally of the nut over t e remainin portion of its length being of a diameter s ightly greater than the outer diameter of the screw threaded operating rod. The operating rod is adapted to engage the screw threaded portion of the nut and the length of the nut will of course depend upon the distance between the

pivotal points

7 and 8 when the jack is raised to its extended position. The length of the operating rod can thus be re duced an amount corresponding to the length of such nut with the exception of from onehalf to three-quarters of an inch so as to allow of such rod being in engagement with the screw-threaded portion of the nut when the jack is in its collapsed position. When a nut of this form is used the operating rod 32 must of course be threaded practically over its entire length.

The height of the rest 20 and the length of the slots 24 therein are such that during the early portion of the operation of the jack, that is for about the first seven or eight revolutions of the operating screw, the lower edges of the side extensions of therest will be supported upon the

transverse webs

16 and 17 and the cam surfaces on the extensions of the upper levers will not be in engagement screw when the upper pivot 9 of the levers 5 and 6 is being raised relatively rapidly with respect to the horizontal movements of the

pivots

7 and 8, the rest 20 will be raised at a slower rate than the movement of such pivot 9 and during the later portion of the operation of the jack' when the vertical movement of the pivot 9 is small as com ared with the horizontalmovements of the

pivots

7 and 8, the rest will be raised at a faster speed than the pivot 9 and thus during the complete operationof the jack, the rest will be raised at a substantially constant speed.

The double lever 2 is preferably mounted with its

side members

2, 2", on the outer sides of the lugs 11 upon which it is pivotally mounted and the lever 1 is preferably mounted with its side members 1, l against the inner sides of the upstanding lugs 10 upon which such'lever is pivotally mounted. If desired however the pair of lugs may be respectively spaced at different distances apart so that the lever 2 may be mounted between the side lugs 11 and the lever 1 may be mounted with its side members embracing the lugs 10. In such case the adjacent side members of the two levers will be closely adjacent each other.

As previously stated, the

side members

21, 22 of the rest 20 preferably embrace the upper levers 5 and 6. Such side members however extend between the side members of the low or levers 1 and 2, and in order to make this arrangement possible, the lower portions of the double levers 1 and 2 are wider than the upper portions thereof where they are pivoted to the

members

7 and 8, the side members of such levers being bent inwardly substantially at the parts indicated at 45 and 46 respectively.

The

pivots

7 and 8 for the upper ends of the lower levers 1 and 2 and the lower ends of the upper levers 5 and 6 are preferably provided integrally with the

members

33 and 34, or 33 and 34 as shown in Fig. 4, such pivots being provided with extension portions 47 preferably recessed as shown, which may be riveted over the outer links when the device has been assembled.

If the base portion 12 is cast, the

pivots

3 and 4 for the lower ends of the levers 1 and have upper faces of arcuate form. They are preferably pressed out from the\metal of which the rest is formed though if desired they may be riveted on to the upper face of the rest or attached thereto by any other suitable means. The upper surfaces thereof may be serrated if desired to prevent slipping. By such an arrangement side strain on the jack during the lifting of the car is minimized since the outer edges of the rest never take the load the line of support always extending well within the upper face of the rest.

The embodiments of the invention herein referred to are given merely by way of illustration and it is understood that various modifications of the various parts of the apparatus described herein may be effected without departing from the spirit and the scope of the invention defined in the accompanying claims.

What I claim is 1. A lifting jack comprising a base member, a pair of levers pivotally mounted at their lower ends to said base member, a pa1r of upper levers pivotally connected at their lower ends to the lower pair of levers respectively, means for turning said lower pair of levers about their pivots, a rest movable relatively to said upper and lower levers, said rest being adapted to directly engage said lower levers intermediate their ends during the earlier period of the raising operation of the jack by during such period and means on sa1d upper levers adapted to engage said rest and to effect the raising thereof after said earlier period of the raising operation of the jack.

2. A lifting jack comprising a base member, a pair of levers pivotally mounted at their lower ends to said base member, means for turning said lower pair of levers about their pivots, means for insuring that equal angular movements will be imparted to said levers, a pair of upper levers pivotally connected at their lower ends to the lower pair of levers respectively, a rest movable relatively to said upper and lower levers, said rest being adapted to directly engage said lower levers intermediate their ends during the earlier period of the raising operation of the jack and to be raised thereby during such period and means on said upper levers adapted to engage said rest and to effect the raisand to be raised thereing thereof after said earlier period of the ralsing operation of the jack.

3. A lifting jack comprising a base member, a pair of levers pivotally mounted attheir lower ends to said base member, a pair of upper levers pivotally connected at their lower ends to the lower pair of levers respectively, means for turning said lower pair of lovers about their pivots, a rest movable relatively to said upper and lower levers, said rest having downwardly projecting extensions adapted to rest directly upon the lower levers intermediate their ends and to support said rest thereon durin the earlier period of the raising operation of the jack and thereby to effect the raising of said rest during such period, and means on said upper levers adapted to engage said rest and to effect the raising thereof after said-earlier period of the raising operation of the jack.

4:. A lifting jack comprising a base member, a pair of levers pivotally mounted at their lower ends to said base member, each of said levers comprising spaced sides connected together and spaced apart by suitable spacing means, a'pair of upper levers pivotally connected at their lower ends to the lower pair of levers respectively, each of such levers comprising spaced sides connected together and spaced apart by suitable spacing means, a rest movable relatively to said upper and lower levers having downwardly projecting extensions adapted to directly engage said lower levers intermediate their ends whereby said rest is supported on said levers intermediate their ends and lifted directly thereby during the earlier period of the raising operation of the jack, and means on said upper levers adapted to engage said rest and to effect the raising operation thereof after said earlier period of the raising operation of the jack.

5. A lifting jack comprising a base member, a pair of levers each comprising spaced side members connected by spacing means intermediate their ends, said levers being mounted at their lower ends to said base member, a pair of upper levers each comprising spaced side members connected by spacing means, such pair of upper levers being pivotally connected at their lower ends to the lower pair of levers respectively, a screw-threaded op erating rod for raising said jack, bearing members for said operating rod connected to the pivots connecting the lower and upper ends of said pairs-of levers, such bearing members being located between the spaced side members of the upper levers, a rest movable relatively to said upper and lower levers, and having spaced side members extending downwardly and embracing said upper pair of levers, such spaced side members being adapted to directly engage and to be supported on said spacing means of the lower pair of levers during the earlier period of the raising operation of the jack and to be raised thereby during such period, means on said upper levers adapted to engage said rest after said earlier period'of the raising operation of the jack andto effect the raising thereof after such engagement, and means for insuring that said lower pair of levers will move equal anular amounts during the operation of the ack whereby said rest will be raised vertically. I

6. A lifting jack'comprising a-base member, a lazy tong device pivotally mounted on said base member comprising upper and lower pairs of levers, a rest slidable relatlvely to said upper and lower pair of levers, and. means whereby said lower pair of levers will effect the raising of the. rest during the earlier period of operation of the jack by direct engagement of said rest with said lower pair of levers intermediate their ends and means whereby said upper pair of levers will effect the raising of the said rest durlng the remaining period of the operatlon of the 'ack. 7. A lifting jack comprising a base member, a pair of levers pivotally connected at their lower ends to said base member, each of such levers comprising spaced s1de members connected together by spacing means intermediate its ends, a pair of upper levers pivotally connected to each other at their upper ends and respectively plvotally con nected at their lower ends to the lower pair of levers, each of such upper levers comprising spaced side members connected together by spacing means, means for operat ng said lower pair of levers, means for insuring that said lower pair of levers will move equal angular amounts during said operation, extensions on the upper ends of sald upper levers having cam surfaces thereon, a rest having means rigidly connected thereto and depending therefrom, such means being adapted to directly support said rest upon said lower levers intermediate their ends during the earlier period of the raismg operation of the jack whereby the raising operation of the jack during such earlier period will be effected directly by means of sald lower levers, and means whereby during the remaining period of operation of the jack said cam faces on the upper pair of levers will engage said rest and effect the raislng thereof.

8. A lifting jack comprising a base member, a pair of levers pivotally mounted at their lower ends to said base member, a pair of upper levers pivotally connected at their lower endsto the lower pair of levers respectively, means for turning said lower pair.

of levers about their pivots, a rest movable relatively to said upper and lower levers, said rest being adapted to dlrectly engage said lower levers intermediate their ends during the earlier period of the raising operationof the jack and to be raised thereby during such period, inter-engaging means on one of said lower levers and said rest for stabilizing said rest during the period when it is directly engaging said lower levers, and means on said upper levers adapted to engage said rest and to eflect the raising thereof after said earlier period of the raising operation of the jack.

9. A lifting ack comprising a base member, a pair of levers pivotally mounted at their lower ends to said base member, each of such levers comprising spaced side memher connected together by spacing members provided intermediate their ends, a pair of upper levers pivotally connected at their lower ends to the lower pair of levers respectively, and pivotally connected together at their upper ends, each of said upper pair of levers comprisin spaced side members connected together spacing members, a rest comprising an upper member having downwardly projecting extensions rigidly connected thereto, each extension being provided with a vertical slot in which the pivot of said upper pair of levers engages, and being adapted to rest upon the intermediate spacing members of said lower levers during the earlier period of the raising movement of the jack whereby the rest is raised by,

said spacing members'during such period, and means on said upper levers adapted to engage said rest and to effect the raising thereof after said earlier period of the raising operation of the jack.

10. A lifting 'ack comprising a base member, a pair of levers pivotally mounted at their lower ends to said base member, each of such levers comprising spaced side members connected together by spacing webs provided intermediate their ends a pair of upper levers pivotally connected at their lower ends to the lower pair of levers respectively and pivotally connected together at their upper ends, each of said upper pair of levers comprising spaced side members connected together by spacing members, a rest comprising an upper member having depending sides adapted to embrace the upper pair of levers, the lower ends of said depending sides being adapted to rest upon the intermediate spacing webs of said lower levers during the earlier period of the raisingmovement of the jack and having an angle of slope'corresponding to that of the spacing webs when the jack is in its entirely collapsed condition, said rest being adapted to be raised by said spacing webs during said earlier period of the raising movement of the jack, and means on said upper levers adapted to engage said rest and to effect the raising thereof after said earlier period of the raising operation of the jack.

11. A lifting jack comprising a base member, a pair of levers pivotally mounted at their lower ends to said base member, each of such levers comprising spaced side members connected together by spacing members provided intermediate their ends, a pair of upper levers pivotally connected at their lower ends to the lower pair of levers respectively, and pivotally connected together at their upper ends, each of said upper pair of levers comprising spaced side members connected together by spacing members, a rest comprising an upper member having downwardly projecting extensions rigidly connected thereto and adapted to rest upon the intermediate spacing members of said lower levers during the earlier period of the raising movement of the jack whereby the rest is raised b said spacing members during such perio each of said extensions being provided with a vertical slot in which the pivot of said upper pair of levers engages and eing provided in its lower extremity with a recessed portion which is adapted to engage a' pin like member on one of said lower levers during said earlier period of the raising movement of the jack, and means on said upper levers adapted to engage said rest and to effect the raising thereof after said earlier period of the raising operation of the jack.

12. A liftin jack comprising a base member, a pair of levers pivotally mounted at their lower ends to said base member, a pa r of upper levers pivotally connected at their lower ends to the lower pair of levers respectively, means for turning said lower pair of levers about their pivots, a rest movable relatively to said upper and lower levers, means whereby during the earlier period of the raising operation of the jack the raising of the rest will be effected by said lower levers from portions thereof intermediate their ends and means on said upper levers adapted to engage said rest and to effect the raising thereof after said earlier period of the ralsing operation of the jack.

13. A lifting ack comprising a base member, a lazy tong device plvotally mounted on said base member comprising upper and lower pairs of levers, a rest slidable relatively to said upper and. lower pairs of levers, means whereby the raising of the rest during the earlier period of operation of the jack will be efiected from said lower levers intermediate their ends and means whereby said upper pair of levers will effect the raising of said rest during the remaining period of the operation of the jack.

14. A lifting jack comprising a base member, a lazy tong device pivotally mounted on said base member comprising upper and lower pairs of levers, a rest slidable relatively to said upper and lower pairs of levers, means whereby said rest is supported from said lower pair of levers intermediate their ends during the earlier period of operation of the jack and raised by said levers durin such period of operation and means where y said upper pair of levers will effect the raising of the said rest during the remaining period of the operation of the jack.

15. A liftin i'ack comprising a base member, a pair 0 evers pivotally mounted at' their lower ends to said base member, a pair of upper levers pivotally connected at their lower ends to the lower pair of levers respectively, means for turning said lower pair of levers about theirpivots, a rest movable relatively to said upper and lower levers, means connected to said rest adapted to engage said lower levers intermediate their ends during the earlier period of the raisin operation of the jack whereby said rest is a apted to be raised by said lower levers during such pe riod, and means on said upper levers adapted to engage said rest and to effect the raising thereof after said earlier period of the raising operation of the jack.

In testimony whereof I affix my signature.

' WILLIAM H. LOLLEY.