US73954A - Improvement in lifting-jack - Google Patents

Description

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JoHN COULTER, sn.; oE XENTA, onto.

Lctters'latent No. 7`3,9 54, dated.' February 4, 1868; anteclated Jamtary 31, 1868.

IMPROVEMENT IE merino-JACK.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOHN COULTER, Sr., of Xenia, vcounty of Greene, in the State of Ohio, have invented a new and improved Lifting-Jack g and I do hereby declare thatf the following is a full and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which like parts are represented by like letters in the several figures.

The nature ot' my invention consists in so constructing and arranging the several parts of the jack, that by means of one ratchet-lever, attached to a windlass, two movable upright pieces, one on each side'of the jack, can be operated at the same time. i

To enable those skilled in the art to make and use my invention, I will proceed to describe its construction and operation. In the drawings- Figure 1 represents a front elevation ofthe jack, and

Figure 2 a side View of one of the standards, to which the pawl is attached.

A A represent, respectively, thc two feet of machine, and B a cross-piece securing them. C C are two standl-ds, Supported by the feet A A, and in which a cross-bar, I), slides up or down. E is a windlass, the ends working or revolving in the top of standards. In 'the middle ofthe windlass are secured two toothed or' ratchetwheels F F, as also a ratchet-lever, G, having a spring, y, at its lower end, which slides over the teeth of wheels F F, or engages them by a reverse movement. a a represent ropesor chains, suspending bar or cross-piece B from windlass E. I prefer facing the inner sides o f the uprights with metal plates b, having a slot, c, in them, for the ends ofthe cross-piece B to move in, and behind these plates, and resting on the cross-piece B, are two sliding vertical metal bars d'cZ, moving in channels or grooves cut in the upright pieces C C. These are intended to be supports for the body to be raised. I can place metal plates also on the outside ofthe standards.

The operation is as follows: The cross-piece B being down, the machineis properly placed under the body to be raised, the same resting on the two sliding vertical barsd d. The ratchet-lever is then pulled backward. Its spring g, engaging the teeth of F F, revolves the windlass, raises the cross-bar'B, and consequently the vertical. bars, and with them the weight to he raised. 0n one standard there is a pawl or detenrt, I-I, which engages a toothed wheel, I, on that end of windlass. By this means the windlass is prevented from running down, whilst the ratchet-lever is worked forward, its spring slipping over the teeth on F F. After the lever has thus`hcen slipped forward, it is again pulled back, simply repeating the operation, and again raising thevertieal bars or body. I can also, in case of necessity, use an additional lever, by putting a hole through my windla'ss,'in which to put my additional lever. It will be seen that simplicity and economy as well Aas dnrabilily characterize my machine. v

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, isf- The combination and arrangement of the standards C C, horizontal sliding bar B, vertical bars cl d, windlass E, with its toothed wheels F F, and ratchet-lever G, toothed wheel I and pawl I-I, constructed substantially as shown and described. i

- JOHN COULTER., s'R. Witnesses:

ARTHUR CHASE, C. W. NEWTON.

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