US178777A - Improvement in lifting-jacks - Google Patents

Description

G. W. HUNTER.

LIF'IING-JACK.

Patented June 13 MPEIERS, PHOTO-UTHDGRAFHER, WASHINGTQN. D. C. I

UNITED-STATES GEORGE w. HUNTER, OF PHILADELPHIA, PENNSYLVANIA, AssIGNoaQoE PATENT OFFICE.

PART OF HIS RIGHT TO J. PARKER NORRIS, OF SAME PLACE, HENRY M.

BAKER, on WASHINGTON, DISTRICT O ooLUMBIA, AnnTHEoDo "LU cHAsE, OF PHILADELPHIA, PENNSYLVANIA," i

.IMPRQVEMENT lNLlFTlNG-JACKS.

Specification forming part of Letters Patent No. 178,777, dated June 13, 1876; application filed May 151181 J T 0 all whom it may concern;

Be it known that-I, GEORGE W. HUNTER, of the city and county of Philadelphia, State of Pennsylvania, have invented an Improved Lifting-Jack, of which the following is the specification s The object of my invention is. an improved liftingjack constructed, as fully described hereafter, to increase the capacity of the jack, reduce the cost of manufacture, and facilitate manipulation.

In? the accompanying drawing, Fig. 1 is a perspective view of my improved lifting-jack, a portion of one of'the side pieces ,being'detache-d, Fig. 2, a front elevation; Fig. 3, a sectional elevation and Fig. 4, an elevation of one of the side pieces. 7

The standard B of the jack consists of two side pieces, b b, of cast metal, each having on its inner face at the lower end a flange, c, at the upper end a flange, d, and near the front edge two parallel ribs, 6 i. The side pieces are placed with the edges of their flanges in contact, and are bolted through the lower flanges to a metal base-plate, A, the front edge of which, below the ribs 7 is cut away, forming a recess, a. The flanges d are -recessed, forming an opening for the passage of alifting-bar, G, which has at thc.lower end a foot-piece, f, and at the sides wings s s, which extend between the ribs t i, and at the front.

edge'of the bar are transverse ribs or serrations beveled on both sides, as shown. To a lateral arm, g, at. the upper end of the bar 0, is hung an adjustable arm, D, pointed at the lower end, and having attached thereto'one end of a chain, E, at the opposite end of which is .a hook, F. In front of the bar 0,'between the side pieces, is hung adoublepawl, G,

either end of which may be brought in contact with the serrated edge of the bar.

To the inner 'end'of a hand-lever, I, vibrat ing between'the side pieces, is hung a link, K, which is jointed at the lower end to the inner end of a tilting-dog, H, the bar 0 extending through the latter, which consists of two flanged side pieces, at t, bolted together. The

. link K is of such a lengththat when the lever I is elevated to the position shown in dotted lines, Fig. 3, the dog will strike the upper ends of the ribs 6, and will be brought to a horizontal position. A11 arm, L, hung to ears on the lever I, rests upon a lug, m, at theinher side of the side piece I), for a purpose de-- scribed hereafter.

From the rear of the standard extends an arm, J, supported by a brace, K, and limiting .the downward movement of the lever, which, as it approaches the arm, tilts the dog H,

clamps, the bar O, and raises both. The pawl G, when arranged, as shown in Fig. 3, prevents the descent of the bar, while the dog H slides downward thereon, as the'lever I is raised. When thelo'ng arm of the lever is' again depressed the dog clamps the bar a d carries it upward, the operations being repeated, as often as may be necessary, to raise the bar to the desired extent.

As the plate A is cutaway beneath'thc ribs 2' i the bar may descend with the foot-piece f below the plate, to permit the foot-piece to be inserted below a railway-tic or other object, X, Fig. 3, the wings 8 extending between the ribs 1, which guide the bar, and the pointed arm D bearing upon the top of the tie and clamping the latter to the'foot-piece.

'Upon elevating the bar in the manner already described the end of the tie will be raised, the standard assuming an inclined position in accordance with the angle assumed by the tie, and firmly retaining the latter. To release the bar, the lever is elevated until the arm L strikes the pawl G and turns it to the-position shown in dotted lilies, Fig. 3, and the dog 11 rests in a horizontal position on r the ribs 2', when the bar, being no longer con is introduced beneath one of the rails from the inner side, and the hook F isattached t0 I insiii-ingthe wired to maintain ital: about rightapglee x ithetiv. WVheu the lever I is brought upon nip ulate standard of two pieees,eacl1 capable of being ClStfIOlIl :tpattern without a uol e,feeilitu tes be made 'at a small eost, while the steadiness which may be imparted to thet ool in opera,-

gwithwhieh the bar may he raised, scouted;

and released, the security with which the obis retained, constitute impotbe. ii each havi flangeslcd his iiie'ise 1 ba 'r' earryl'iifi iu adf utabl arm,fD,substaui-f tia l ly ae and forthe purpose set forth. i 2. The combinz'ltion ofthesliding bar of lifting-jack and a ol ztih secured perlnzi el itly to the foit' i M 3;,The' dombinatioma the standardmigill lied. i

4. The ldo l hle-e gled pmvlcombined with i the slidilifiliii Iiiiiiig teeth inclined at both sides, to arrest the movement of the fba r in j eitheiigli 'eetiol es specified. y

M 5, Tlieeoiiiljiiizltioiioftli lilliilbii*; i)ew], ofiefeting-lever I, and a L wherebyflthek i I it ipawl is thrown outward.fol eleyating the lejvelyy f substantially as described 1 i renew; I

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