US242863A - Lifting-jack - Google Patents

Description

aL-yf (No Model.) I

' P. W. BATES.

Lifting Jack. 10.242,863. Patented-June 14, 18:81.

N. PETERS. Phil-Mwgnplur. Wnshgngmn. D.C.

UNITED STATES PATENT OFFICE.

PHILANDER WV. BATES,`OF SILVER GREEK, NEWr YORK.

LIFTING-JACK.`

SPECIFICATION forming part of Letters Iatent No. 242,863, dated `June 14, 1881.

Application tiled March 29, 1881. (No model.)

To all whom it may concern:

Be itknown that I, PHILANDER W. BATES, of Silver Greek, in the county ot' Chautauqua and State of New York, have invented new and useful Improvements in Litting-Jacks,`of which the following is a specication, reference being had to the accompanying drawings.

This invention relates to that class of liftingjacks which are provided with a lifting-cam, forming the short arm of the lifting-lever, a vertical lifting-bar which rests on thc cam and is guided in the standard, and a head which is adjustable, connected with the lit'tingba-r and adapted to engage under the object to be lifted. The object of my invention is to improve the construction of the various parts'which compose the. lifting-jack and my invention consists of the particular construction of these parts as hereinafter fully set forth.

In the accompanying drawings, Figure l is a sectional elevation, Fig. 2, a side elevation, and Fig. 3 a front elevation, of my improved lifting-jack. Fig. 4 is a horizontal section on an enlarged scale in line x rv, Fig. l. Fig. 5 is a vertical section on an enlarged'scale in line y y, Fig. 1.

Like letters of reference refer to like parts in the several figures. i

A represents the base of the standard; B, the center piece of the standard, secured bya tenon in the baseA; and C U are the side pieces ot' the standard, which are bolted to the center piece, B, and rest on the base A.

D 'is the lifting-lever, pivoted between the side pieces, C, of the standard at d. The lever D is provided with a short arm, d, which is formed likea cam, having a curved upper surface which gradually recedes from the fulcrum d of the lever, and which is provided at the end farthest from the fulcrum with a depression or notch, d2. The cam d is preferably constructed of cast-iron and provided with a socket, d3, in which the handlever D is secured.

E is the lifting-bar, which is arranged in a vertical position between the upper portions of the side pieces, C, ofthe standard. The bar E is guided to move vertically in the standard by rollers f, which turn on arbors Xed in the standard and engage in vertical slots g formed in thebar E. The latter is provided at its lower end with a roller, h,whereby the bar E rests upon the upper surface of the cam d. The pivot d of the lifting-lever D is arranged vertically below the bar E, as clearly shown in Fig. 1. The bar E is provided on its outer side with triangular teeth i, which have their abrupt faces turned upward and their inclinedfaces downward.

K represents the adjustable head which is applied to the lifting-barE for engaging under the object tobelifted. TheheadKbe-ars against the front edge of the bar E and is provided with two vertical ribs l which en gage behind the rib I,on which the teeth i are formed, and whereby the head Kis connected with the bar E,so as to slide vertically7 thereon. The head K is supported in any desired position lby a pawl, m, which is pivoted in the head K, and projects from its lower side and rests upon the abrupt upper face of one of the teeth i. The head K is composed of two parts secured together side by side,by rivets or otherwise, and holding the pawl m betweenthem. The pawl is attached to the head K by a rivet or pin which passes through an elongated opening, n, in the pawl, whereby the latter is rendered capable of a limited movementiu the direction of its length within the head K. The overhanging upper end ofthe pawl is weghted,.whereby the lower end of the pawl is turned against and kept in contact with the teeth i ot' the bar E. The pawl m is made so long that its upper end will come in contact with the top plate of the head K before the lower end of the slot n 'comes in contact with the pin passing through this slot. By this construction, the weight of' the object resting on the head K is supported by the pawl m and the teeth of the lifting-bar E, and the pivot on which the pawl turns is relieved of this weight. The two halves of which the head K is com posed are recessed on their contiguous sides to accommodate the pawl, and provided at their rear and lower sides with openings,

through which the lower end ofthe pawl plays.l

One ot the halves composing the head K is provided with a horizontal flan ge, o,which projects into the recess of the other half, immediately below its top rib, as shown in Fig. 5. The projectin g dan ge o forms a bearin g-surface against which the upper end of the pawl m works, and prevents the pawl from straining the upper joint of the two halves.

In raising the head K on the bar E the pawl IOO p m slides over the teeth i, but upon applyinga weight to the head K the pawl m engages with the teeth and firmly supports the weight. Upon disengaging the pawl from the teeth the head K is readily lowered on the bar E. By depressing the lever D the cam d and the bar E resting thereon are raised until the extreme elevation ot' the bar E has been attained,when the roller h engages in the depression d2 of the cam, and thereby locks the lifting-bar in this position as the pivot d of the lifting-lever is arranged vertically below the center ofthe roller. As the bar E is guided in the standard and supported upon the lifting-lever by rollers the bar is easily operated by the lever. The different parts of my improved liftingjaek are simple, strong, and easily put together, and form a very e'fiici'ent. and durable lifting apparatus. a

I claim as my invention- 1. Iii a lifting-jack, the combination, with the standard provided with tixed rollers f, of the lifting-barE,constructed with vertical slots g in which the rollers fen gage, ahead, K, made vertically adjustable on the barE, and a liftinglever D, having its fulcrum located vertically below the lifting-bar, and having its short arm formed by a cam, d', provided near its farther end with a depression, d2, in which' the liftingment in the direction of its length within the head, whereby the thrust is applied to the end of the pawl and the pivot thereof relieved from the strain, substantially as set forth.

4. The combination, with the lifting-bar E, Aprovided with teeth i, of the head K, and the pawl m, having a slot, n, through which passes the pivot by which the pawl is connected with the head K, substantially as set forth.

5. The combination, with the lifting-bar, ot the head K, composed of two recessed parts secured together side by side, one of the parts being provided with a horizontal flange, o, projectin g into the recess of the other part, and a pawl, m, pivoted between the two parts of the head, substantially as setvforth.

P. W. BATES.

Witnesses:

JN0. J. BONNER, l EDW. J IBRADY.

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