US269089A

US269089A - Lifting-jack

Info

Publication number: US269089A
Authority: US
Publication date: 1882-12-12
Anticipated expiration: 1899-12-12

Description

(No Moel.) Jl C.. MIGHAEL' K LIFTING JACK,

1 Patented Deo'. 12. 1882.

Fla? 2 Y lill WVTITNESSES:y Ed/m y .92% t INVBNTR/ ATTORNEYS.

UNITED STATES PATENT OFFICE.

.JOHN C. MICHAEL, OF BLACK BOOK, WEST VIRGINIA.

LlFTiNG-JACK.

SPECIFICATION forming part of Letterslatent No. 269,089, dated December 12, 1882.

Application filed October 24, 1882. (No model.)

To all whom it may concern:

Be it known that I, JOHN V(J. MICHAEL, of Black Rock, in the county of Grant and State ct' West Virginia, have invented certain new and usefulImprovements in Lifting-Jacks; and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawingswhich form a part ofthis specification, and in which Figure I is a perspective view of my irnproved lifting-jack, and Fig. 2 is a vertical sectional view of the same.

Similar letters of reference indicate corresponding parts in both the figures.

Myinvention has relation to lifting-jacks, and it consists in the improved construction and combination of parts of the same, as hereinafter more fully described and claimed.

In the accompanying drawings, theletter A represents the rack-bar, which slides in a recess, B, in the casing C'. y

`The rack-bar is provided with a head,D, upon which the object to be lifted rests, and the beveled end of a lever, E, engages the ratchetteeth on the rack-bar. The lever and the casing C are preferably made of strong wood, and the beveled end ot' the lever is provided with a shoe of iron, F. The lever has its i'ulcrum on a bolt, G, fastened in the sides ot' the casing, and passing through an ironlined slot, H, in the lever.

Pivoted on a bolt, I, passing through the sides of the casing, isa pawl, J, which engages the rack-bar below the lever. This pawl has an arm, K, to which is hinged a rod, L,which passes through a loop, M, depending from the lever, and is provided with a handle, N, by

which it is operated. The pawl proper rests, when engaging the rack-bar and supporting it while the'outer end of the lever is raised and the beveled end ot' it engagesa lower tooth on the raekb'ar, with its under side against the beveled end of the rear part, P, of' the casing. This beveled top is shod with iron, as shown at Q, and serves to relieve the strain on the bolt I, while it is beveled, so as to admit ofthe pawl being` disengaged by drawing on the handle N of the rod L, which tilts the pawl and its arm back, releasing the rack-bar.

A spring, R, may be fastened on the back piece, P, ofthe frame, with its free end bearing against the arm K of the pawl, so as to force it against the rack-bar; ,or the pawl i proper may be so balanced to the arm K that it will fall in place by its own weight.

By the foregoing description, taken in connection with the accompanying drawings, the working ot' my lifting-jack will be easily understood without'further explanation.

Having thus described my invention, I claim and desire to secure by Letters Patent of the United Statese ln a lifting-jack, the combination of the casing C, having beveled back piece, l?, the rackbar A, having head D, the slotted lever E, having loop M, and the pawl J, adapted to rest, i

against the beveled end Q of Ythe back piece, P, and having arm K, and rod L, all constructed and combined to operate substantially as set forth.

In testimony that I claim the foregoing as my own, I have hereunto affixed my signature in presence of two witnesses.

JOHN CLARENCE MICHAEL.

Witnesses:

WM. M. LYON, M. M. SMITH.