US1241591A

US1241591A - Jack.

Info

Publication number: US1241591A
Application number: US12670816A
Authority: US
Inventors: Walter L Widlar
Original assignee: JIFFY JACK Co
Current assignee: JIFFY JACK Co
Priority date: 1916-10-20
Filing date: 1916-10-20
Publication date: 1917-10-02
Anticipated expiration: 1934-10-02

Description

W. L. WEDLAR.

JACK.

APPLlcATlON FILED ocT. 20. 1916.

. ,2&1 ,go Y Patented Oct. 2,1917.

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JACK.

APPLICATION FILED ocT. 2o, 19H5.

Patented Oct. '2, 1917.

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WALTER L. WIDLAR, OF LAKEWOOD, OHIO, ASSIGNOR TO TIE-IE J'IFFY' JACK COMPANY, OF CLEVELAND, OI-IIO, A CORPORATION: OF OHIO.

JACK. i

To aZZAwL'am t may concern.' l i Be it known that I,. VALTER L. WIDL'AR, a citizen of the `United States,` residing at Lakewood, in the county of Cuyahoga and'l State of Ohio,4 have invented a certain new and' useful Improvement in Jacks, of which the following is a full, clear, and eXact de-V scription, reference being had to .the accompanying drawings. j

This invention relates generally to lifting jacks and more particularly to one designed for automobile use, and the object of the invention'is to provide a cast metal jack which will be inexpensive, very light and durable, exceedingly easy and accurate in its operations, and one which will permit the l'oad to be raised'or lowered step by step with ease and rapidity.

Another obj ect isto providea step by step jack in which only one spring is employed anda still further Objectis to provide a jack in which the lifting bar can be pulled out to its maximum height, or dropped' back instantly,v when desired,

With 'these various objects in view the invention. consists. in the novel features of construction and the manner of arranging the same,v all of which willbe fully described hereinafter and pointed out in the claims.

'Infthe drawings forming a part of this specification, Figure 1 is a perspective view of a cast' metal lifting jack embody-ing one form of my invention; Fig. 2 is Ia sectional elevation illustrating the positions of the parts at. the start of the lifting movement; Figsf and 4 are similar yviews showing the position'sg'of the lparts at subsequent stages of. they lifting operation; Figs. 5, 6, 7 and 8 are similar views showing, the various positions of the parts during the various stages of the lowering operation; Fig. 9 is a transverse .sectional view on theline 9-9 of Fig. 2 andV Fig. 10 is a. view illustrating in perspective the lever,.pawls,cam,jshifting lever and pivot connection all detached and sepa.- rated.. i

, In theA practical embodiment of'my inventionI employ a hollow cast metal standard 10, having a flat base 11 integral therewith;

Specificationof Letters Patent.

Patented oet. 2, wie.

Application med october 2o, 1916. 4 serial No. 126,708.

and1 working in the hollow standard 10 is the lift bar 12 having a curved head,13. The lift bar'is'provided with ratchet teeth 14 in the forward face.

The standardI -is made with a forwardly projecting housing 110a in which is pivoted the operating lever 15 uponr the pin orl bolt 16, the outer endA of the lever being socketed or hollow to receive the wooden handle 17. rIlhe inner' end' of the lever 15 is bifurcated as shown at 18' and between the members are pivot'ed` the working `pawl 19 and the holding pawl- 20, the holding pawl being pivoted upon the pin or'bolt 16`whi`le the pawl 19 is pivoted at the eXtreme inner end of the lever and therefore has thepower communicated thereto through the lever.

One: of the members 18 hasy a circular boss 18a surrounding the. pivot opening and this circular boss serves as a pivot forthe cam plate 21 which is slotted; at 22' providing a finger 23 and a head 2a and this cam plate 2'1'also has a rectangular shaped opening 25 adjacent the end of the slot 22. A laterally projecting lug 26' is arranged adjacent the pivot opening of,I the cam plate andv in substantial alinement with said pivot opening and the slot 22. The working pawl l19 carries a laterally projectingpin 27 which is v adapted towork in the slot 22, and the holding pawl 2O has a laterally projecting pin Q8 which works inthe rectangular shaped opening in va manner hereinafter keX- plained'.

Aj shifting lever is also pivotedlupon the boss 18a, this lever having'a notch 30 adapted to straddle the lug 26 and the inner end ofthis shifting lever is connected toxa spring 31 having a central core, the opposite end of the spring being securely fastened at 32 at the lower end of the housing 10a.

The operation ofthe parts is as follows.

` In order to lift a load through the medium of the liftingfbar, the shifting lever 29 is thrown upwardly as shown in Figs. 1', 2, 3 and 4.# and the lever is worked Vup. and down on the pivot 16. The working pawl 19k engages the ratchet face ofthe lifting bar and causes the bar to bev moved upwardly at l desired eXtent.

l maximum elevated yposition of the handlewiththe ratchet face of the lifting bar and l hold the same while vthe working pawl is l moved out by nger 23 and carried downwardly to obtain a lower engagement with the lifting bar, and these operations are continued until the load has been lifted to the .When it is desired to lower the load, step by step, the shifting lever 29 is thrown downwardly as indicated in Figs. 5, 6, 7 and 8 and it will be understood that as the lever j 29y is movedv from one position to another the cam plate 21 is` also'shifted by the engagement of the lug 26 with the notched portion 80 of the shifting lever and the spring 31 r will hold the cam plate in either one of its adjusted positions. A y

The shifting lever 29 having been thrown down, the hand lever 15 is worked down and up, being-moved down to-obtain a: grip and up to lower the bar with the load thereon. Fig. oillusltrates the position vj ust prior to the shifting of the load from theholding pawl 20 to the working pawl 19, and Fig. 6 illustratesl the lowermost position of the hand lever 15 wherein the load has'been shifted entirely from the holding pawl 20 to the lowering pawl 19. The holding pawl 20 is released byv thevpull of the spring 3l just as soon as the working pawl 19 assumes theload.` Fig- 7 illustrates theposition of the parts just prior'to the shifting Aof the load from the working pawl 19 to the hold ing pawl 20, the pin 27 of the Vpawl 19 coming'ntov engagement with the finger 23 of the cam plate and thereby actuating the cam in a counterclock wise Vdirection against the pull of the spring 31 and permittingl the holding pawl 20 to drop into Vengagement with the lifting bar. Fig.y 8 illustrates the ver 15 wherein the holding pawl 20 has assumed the entire load andthe pawl-,19,is kicked out of the path' of the ratchet teeth by the nger 23, the cam and its finger 23 being atfall times biased'in a clockwise direction. The holding pawl 20 holds the lifting bar in this position while the hand lever 15 is being againl lowered to the position shown in Figs. 5 and 6 where the working pawl 1'9-is caused to take a kfresh lowering grip, the operations being continued until the lowering of the load is complete.

It'will vthus be -s'een that I provide an eX- ceedingly strong, simple and durable jackand one which can be jquickly and easily adjusted. forv either raising or 4lowering a vload step by step. l

It willalso be understood thaty the lifting bar, with no load thereon, can be instantly dropped. when desired by throwing down the shifting lever and workingthe hand lever. The lifting bar can also be pulled out to itsmaximumheight at any time.4 Thus it will be seen that the jack is a quick acting one in both directions. l

f I-Iaving thus described my invention, what I claim is 1. In a device of the kind described,'the combination with a standard, of a lifting Vmember movable therein, a lever pivoted thereto,a' holding pawl connected to the lever pivot, a working pawl connected to the end of lever, a shiftable cam having a finger adapted to engage the working pawl, said cam also having an openingadapted to receive a lpin carried by the holdingu pawl, and a vspring actuatedshifting lever adaptedto engage ysaid cam and in one position bias the holding pawl toward said lifting meinber and in the other position bias the same in the opposite direction.`

2. In a device of the kind described, the combination .withA a v standard, lifting bar and lever, of a working pawl connected to the end of said lever, a holding pawl arranged upon the lever pivot, said pawls hav-l ing laterally projecting pins, a "cam arranged upon the 'lever pivot' and having an opening and a slot. adapted to receive respectively Athe pins of the holding and working pawls, and a spring actuated shifting lever mounted also upon the lever pivot, said shifting lever being adapted to engage the cam and in' one position bias the-holding pawl toward said liftingmember andv in the other position bias the same in the opposite direction. l 3. In a device of the kind described,the combination of a standard, offa lifting mem. ber movable'therein, a lever pivoted thereto, a holding pawl connectedto the lever` pivot, a working pawl connected tothe end of said lever, a cam and a shifting lever also'mount ed upon the lever'pivot, said .p'awlshaving lateral projections adapted to engage said cam, said cam vvhaving a finger, ahead, and an'opening adjacent said head,and a slot between said finger and head, said cam also having a lateral projection adapted toen-` gage the shifting lever, anda spring having one end connected to said shifting lever, the opposite end being secured to the standard. 4. In a device of the kind described, the combination with a standard, of a .lifting member movable therein, a lever pivoted thereto, a holdingpawlconnected to thelever pivot, said' holding pawl having thereon a laterally projecting pin, a .working pawl connected to the end of lever, a shiftingcam having a fingeradapted to engage the working pawl,.said cam also having a lost motion connection with the pin on' said holding pawl, and a spring actuated shifting le- In testimony whereof, I hereunto ax my ver having a 10st motion connection with signature in the presence of tWo Witnesses. said cam, said shifting lever being adapted in WALTER L VIDLAR one position to bias said cam and said holding pawl toward the lifting member and in Witnesses: l the other position to bias them in the oppo- M. F. THOMPSON, site direction. A. L. MCMANAMON.

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