US1119241A - Lift-jack for vehicles. - Google Patents

Description

J. H. BURKHOLDER.

LIFT JACK FOR VEHICLES.

APPLICATION FILED OUT. 5. 1912.

Patented Dec. 1,1914

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LIFT JACK FOR VEHICLES.

APPLIOATION FILED 0015,1912.

1,119,241. 7 Patented De0.1,1914.

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TED STATES PATENT orrron.

JOHN H. BURKHOLDER, OF ASHLAND, OHIO, ASSIGNOR TO ELITE MANUFACTURING COMPANY, OF ASHLAND, OHIO, A CORPORATION OF OHIO.

LIFT-JACK FOR VEHICLES.

Specification of Letters Patent.

Patented Dec. 1, 1914.

Application filed October 5, 1912. Serial No. 724,019.

1 '0 alt whom it may concern:

Be it known that 1, JOHN H. BURK- HOLDER, citizen of the United States, residing at Ashland, in the county of Ashland and State of Ohio, have invented certain new and useful Improvements in Lift-Jacks for Vehicles, of which the following is a specification.

This invention relates to lift jacks for yehicles, and is an improvement on the style of jack shown and described in Letters Patent of the United States issued to me on the 3rd day of October, A. D. 1912, and numbered 1,004,741, the same being known to the trade as a tire saver. The said tire saver jack, however, has a certain limitation which it is the object of the present invention to remedy. For example, when the jack is placed beneath a wheel axle or hub and the lift standard is brought up against the same from beneath and engaged a single downward movement of the actuating lever is the limit of action, and the vehicle is thus raised high enough to at least relieve the tire but it cannot be raised higher. Of course this was and is suflicient for tire saving purposes as the jack lifts high enough to take the weight of the load from the wheel and tire, but often it is desirableto raise the vehicle so that the wheel can be rotated or removed, and the present invention provides for this additional elevation and enables the load to be raised step by step to any desired height and also to be lowered by a like movement, all substantially as shown and described and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of the jack showing the parts in raising position. Fig. 2 is a cross section substantially on line w-w, Fig. 1, omitting the upper yoke or pawl. Fig. 3 is an elevation of the jack with the parts in lowering position and the lower pawl engaged, and Fig. 4 is a view corresponding to Fig. 3 with the upper pawl engaged and the lower pawl disengaged, as hereinafter fully described. Fig. 5 is a perspective detail of the tripping or reversing device.

Having reference now to the parts, 8 represents the standard, which has the usual base and is provided with a pl..in straight front edge having lateral flanges 9. which are slidably engaged by clips or ears 3 on the ends of the lift-bar or member I). The

said lift bar has an arm a at its top in which the support 4 is rotatably seated through its shank or stem, as formerly, but a rigid support instead of a rotatable one might be used on said arm. The said bar also has the usual ratchet teeth 5 at its front edge, and said teeth are adapted to be operatively engaged by the two yoke or clevis shaped pawls c and (l. The upper of these pawls or yokes is pivoted on the short arm or extension 6 on lever 7 inside its pivot 8 at the top of standard 8, while the pawl d is pivoted at 9 on said standard and relatively beneath pawl o. The said pawls work in unison as the said bar I) is raised and lowered, and the operation of both is step by step on the ratchet teeth 5. That is only one step is taken at a time with each complete stroke of lever 7 up or down. In either or both directions of movement the pawl or yoke 0 is positively actuated while the pawl d operates by gravity when the lift-bar is being raised but is released and thrown out to engage the next higher' tooth by the reversing mechanism when the said bar is being lowered.

Thus, assuming that the said bar is being raised to lift the load, as in Fig. 1, it will be seen that the pawl cl takes and holds the load while pawl c is being lowered to another gripping position, andsaid pawl 01 then drops by gravity over the next tooth beneath, being free on its pivot 9. On the other hand when the load is to be lowered the reversing device it is rotated on its pivot from position Fig. 1 to position Fig. 3. structurally the said device or part is shown ashaving controlling arm 10, an actuating projection or finger 12 and a lug 13 on its inside adapted to engage the pawl (Z. The said finger is brought into use when the parts are changed to position for lowering the lift-bar, as in Fig. 3, when it is adapted to bear against the swell or enlargement 1 1 on yoke c and cause the said yoke to swing outward on its pivot and free from engaging relations with the teeth 5 in the lowering operation of the lift-bar. as seen in Fig. 3. Said figure also shows the yoke or pawl (Z in supporting relations with teeth 5, and it is free to gravitate to this position the moment that the spring m and arm 10 are pressed back far enough by the action of swell 14 on projection 12 under the weight of the load on the lift-bar and as the lever 7 is being raised. Then as the said pawl drops into action the load is taken from yoke 0 and the counter pressure of springmasserts itself and throws the said yoke out as in Fig. 3. Then as the lift-bar is lowered still farther and the yoke c is free it clears itself above finger 12 and drops back to engaging relations and again takesthe load on the next tooth above the one it released. As it does this the pawl 02 is kicked off by the spring and remains there until itis released by the action of the yoke on projection 12 as before and so on successively. It should be understood here that with the load on the lift-bar the said swell ld'exerts a positive pressure against finger l2 and the spring m and forces said parts back while the liftbar and pawl c are being lowered. This liberates pawl d from spring pressure and v lets it gravitate to engaging position as above described. "Said pawl d therefore makes'such engagement and takes the load on-the lift-bar while yoke cis lowered-a little farther. As this occurs the springm reacts on thel-deviceh'and instantly throws pawl c outward clear ofteeth 5, -F ig. 3. Then. instantly said pawl drops back-toeneas P sition, and a reversal of said lever and parts repeats theformer operation aintil .atlast the load is lowered as far as required. The said spring at is secured at about the lower end of the guard or stop 18 which is cast integralwith the standards inthis instance and has an outwardly extending flange from its" bottom upward as shown to afford the spring all the necessary rearward movement :and yet "serve to prevent thereversing device it from being rotated inthe wrong direction. These positions severally are seen in Figs. 1, 3 and 4, with slight changes: in the position of .the spring when the trip 1/2, is reversed.

It follows from theforegoing that inwthe raising of the liftbarfthetwo pawls are free to slide overthe backs of the ratchet teeth and to engagesuccessi'vely as the lift proceeds, first one and then the other and the trip or reversing device it is looked back out of use. This is done by rotation of the device to position Fig. 1, thus carrying projection 12 to the rear. On the other hand, when the lift-bar is being lowered the pawl o is'first'kicked off by the action of spring on andthenthepawld in succession, the throw outward from the ratchet teeth momentarily of each being necessary to obtain the step by step lowering of the lift-bar and load. Thesemovem'ents also are automatic and n0 hand action is required except to reverse thesaidtrip according to the next .movementdesired, whether toraise or lower the load.

What I claim is:

1. In; lift jacks for vehicles, a standard having a rigid inclined guard extending laterally at its rear and side, a pawl pivoted on said standard-"in front of said guard, a reversing device on the pivot '.of said pawl opposite said guardnnd -a flat spring hearing against-said deviceandlimited in its outward movement by said guard.

2. In lift j ac'ks,ia" standard and-a- 'liftbar slidably mounted vthereon having ratchet teethya lever pivoted on'said standard and a yoke :hung' from said lever engaging said teeth, in-rcombination' -w1th take-up pawl pivoted on :said standard relatively. be-

neath said; yoke,-a reversing device having a fingerto engage beneath-said yoke and. lift the same and aprojection-on its inner side extendingfibeneathsaid pawl, a flat spring fixedatiits "lower end to said standard and adapted to bear *a'gainstsaid projection in both "its posit'i0ns wof operation.

' I=n-testimony whereof. I a'fiix my signaturein gpresence'iof'i two witnesses.

JOHN H. *BURKHOLDER. Witnesses:

JAY .Taeennr, C. G. GrrArMA-N.

Copies ofi thia patentmay'be obtained for fiveoe'nts each, by addressing-the Commissioner-of. Patents.

Washington, new

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