US1230818A - Lifting-jack. - Google Patents

Description

E. c. BATES.

L|FT|NG JACK.

APPLICATION FILED SEPT.'16| I9l4.

1,239,818, K Patented June 19, 1917'.`

EDIVINID C, BATES, OF ALLIANCE, OHIO, ASSIGNOR T THE BUCKEYE JACK MANUFAC- TURING COMPANY, ALLIANCE, OHIO, A CORPORATION OF OHIO.

Application filed September 16, 1914.

To all whom t may concern:

Be it known that I, EDMUND C. Barns, a citizen of the United States, residing at Alliance, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification.

The invention relates to jacks having ratchet teeth on the side of the lifting bar, and a pair of pawls operating in alternate engagement therewith for lifting and lowering the bar; and the object of the improvement is to provide simplified and efficient means for controlling the action and operation of the reversing lever employed in ]acks of this type.

rThe object of the invention is attained by providing a torsion spring having one of its ends extended to form an yelongated finger in sliding engagement with one end of the reversing lever, for holding the same either in or out of its proper position for reversing the operation of the jack, and at the same time permitting the lever to yield in the performance of its reversing action.

A preferred embodiment of the invention is illustrated in the accompanying drawings, forming part hereof, in which Figure 1 is a perspective view of the lift ing jack, with one side plate omitted to show details of the operating elements;

Fig. 2, a fragmentary side elevation of the same; and

Fig. 3, a fragmentary perspective vie iv of a modified form of the controlling spring.

Similar numerals refer to similar parts throughout the drawings.

The base 1 of the jack is provided with the upright standard 2, in which is formed a guideway for the lifting bar 3 having the rest 4 on its upper end and the ratchet teeth 5 on one side.

The operating lever 6 is fulcrumed on the pivot T mounted in the standard, on which ivot is also mounted one of the pawls 8, while'the other pawl 9 is mounted on the inner end 6a of the lever by means of the pivot 10; the pawls S and 9 being adapted to alternately engage the ratchet teeth on the side of the lifting bar for the purpose of raising or lowering the same in the manner well known in the art.

The reversing lever 11 is mounted on the pivot 12 on the side of the standard, adj acent to and preferably below the pivot 7 of Specification of Letters Patent.

Patented June 19, 1917.

Serial No. 862,005.

the operating lever; and the reversing-lever is provided with the operating handle 13 extending outward, and the lowering block 1li extending inward and upward from its pivotal bearing. The lowering block isprovided with the cam faces 15 and 16 coperating respectively with the posts 17 and 1S on the sides of the pawls 8 and 9, for controlling the same in the action of lowering the lifting bar in a manner well known in the art.

The coil of the spring 19 is mounted on the post 2O fixed on one side of the stand ard 2 adjacent to and above the lowering block 14:; which spring has one end Qlusecured to or stopped by the flange 2a on the standard, and its other end 22 is elongated and extend d downward as a finger in sliding engagement with the inner end 23 of the reversing lever, in which end is provided the notch 24 for holding the spring finger from lateral displacement on the end of the lever.

By this construction and arrangement, it is evident that the lateral pressure of the elongated finge-r 22 against the inner end 23 of the reversing lever serves to hold the same upward, with the cam faces on the loweringblock in the path of the posts on the sides of the pawls, for controlling the same in the reversing or lowering operation of the jack, as shown in Fig. 1; or to hold the inner end of the reversing lever downward with the cam faces of the lowering block out vof the path of the pawl posts, when rotated to such position by means of the handle 13 on the outer end of the lever, as shown in Fig. 2; which rotation is permitted by the sliding of the inner end of the reversing lever along the finger of the torsion spring.

And it is also evident that when the lowering block` on the inner end of the reversing lever is held upward to bring its cam faces in the path of the pawl posts, the sliding contact of the finger of the controlling spring permits the intermittent movement of the block required for a proper control of the pawls in their action in lowering the lifting bar.

The spring finger may be shaped with the reverse bends 25 and 2G in its shank, below which the engaging portion may be formed substantially straight, as shown in Figs. 1 and 2, or the entire finger can be shaped as a fiat curve 2Q, as shown in Fig. 3, without materially varying its sliding action in IOC' holding and controlling the operation of the reversing lever.

I claim:

A lifting jack including an upright standard With a lifting bar operatively mounted therein having ratchet teeth on on'efs'ide, an operating lever fulcrumed on the Standard, a paWl pivoted to the standard and a paWl pvoted to the vinnerfend of the operating lever operatively engaging the ratchet teeth, there being posts on the sides of the pawls, afreversing'lever pivoted to the standard havia-ig a lowering block on its inner end with cam faces which may be rotated into the path of the ypawl posts, and spring mounted on the standard having an'elongated laterally yield'ingspring abutment in sliding engagement with one end of the reversing lever for pressing the same in opposite .directions for holding` the .lowering block either in or out of the path of the pawl posts.

p EDMUND C. BATES. Witnesses: Lann C. CARLSON. LoU-Isn M. Comix.

-Ccpies of this patent lmay .be obtained .for five cents each, by addressing the Commissioner o ftlatents,

` 'Washington, D. C.

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