US341962A - Lifting-jack - Google Patents

Description

(No Model.)

0. A. S'ULZMAN.

LIFTING JAGK. No. 962.

Patented May 18, 1886.

: Inventor CHAS. A. 8ULZ/W/W, M b w WW MMWMQM,

Wornq N, PETERS, Pholo-Lfllwgmpher. Washington, D. C

' State of New York,

NITED tarts CHARLES A. SULZMAN, OF XVATERFORD, NElV YORK.

LlFTiNG JACK.

SPECIFICATION forming part of Letters Patent No. 341,962.,

dated May 18, 1886.

Application filed January 29, 1886. Serial No. 190,163, (No model.)

To aZZ whom it may concern:

Be it known that I, CHARLES A. SULZMAN, of Waterford, in the county of Saratoga and have invented new and useful Improvements in Lifti ng-J acks, of which the following is a specification.

Myinvention relates to improvements in apparatus for. mechanically raising and sustaining heavy bodies; and the ob ect of my invention is to provide a simple and reliable device for the above-named purpose. This object I attain by means of the mechanism illustrated in the accompanying drawings, which, being herein referred to, form part of this specification, and in which Figure 1 is a front elevation ofmyjack; Fig. 2,arear elevation Fig. 3, a side elevation; Fig. 4, ahorizontal section at the line aa: of Fig. 1; Fig. 5, a vertical section at the line i/ y of Fig. 4, and Fig. 6 a detached rear elevation of the operating-lever.

As shown in the drawings, A is the basepiece, provided with a hollow standard or sleeve, a, having short curved ribs a across its face. Said ribs are spaced at equal distances to conform to a spiral scroll on the wheel, hereinafter described.

Bis a sliding bar fitted to slide telescopically in the sleeve (6, and provided with a hub, Z), that is formed on said bar, so as to project at a right angle to the face thereof.

is a wheel or disk fitted to revolve freely on the hub b, and having on its outer face a standing rim, 0, which forms an internal and exten nal ratchet-wheel. On the opposite face of the disk 0 there is a projecting rib,which forms a spiral scroll or volute, c. Said scroll expands at a regular pitch, and is so arranged as to engage with the curved ribs a in such manner that the rotations of the disk 0 will cause the sliding bar toslide into orout of the sleeve c, according to the direction in which the said disk is rotated.

D is a sliding sleeve, which fits over the upper part of the sliding bar 13, and has a rising and-falling movement that is independent of the latter. Said sleeve is provided with curved ribs (2, which, like the ribs a on the standard a, engage with the spiral scroll c 011 the wheel 0. At the upper part of said sliding sleeve a swinging stirrup, d, is pivoted, for pose hereinafter explained.

a pur- E is a lever by which the wheel (J is operated. Said lever is adapted to receive both a sidewise and an up and-down swinging motion, in the manner of a universal joint, and for this purpose it is pivoted to swing on the points of the set-screws c, which enter the collar F, the latter being fitted to rotate freely on the hub o of the wheel (3. The lever B is provided with two spring-catches, e, of which the one at the end of the lever is adapted to engage with the internal ratchet-teeth on the rim 0, and the other is adapted to engage with the external ratchet-teeth on said rim. \Vhen said lever is in its midway position between the two extremes of its sidewise movemeuts,both of said spring-bolts 0 will be held clear from any engagement with either set of the ratchetl teeth. The wheel 0 and collar F (and by the latter the lever 10) are retained. in place by a bolt, I), which enters the hub b for that purpose.

G is a headpiece fitted to slide on the upper part of the sliding sleeve I). Said head-piece is provided with a cap, 1, on which the weight to be raised will rest, and a slotted opening, g, which permits said headpiece to slide down past the stud by which the stirrup d is attached to the sliding sleeve D and past the transverse ribs (1 on said sleeve. Said headpiece is also provided with serrated projections or hooks g", with which the stirrup d is adapted to engage for the purpose of locking said headpiece to the sliding sleeve (1.

The mode of operating my improved jack is as follows: The head-piece G being lowered to D, the jack is placed under the weight to be raised, and the head-piece G raised to the nearest point permissible by the hooks 9, so that the cap gwill be as close as possible to the under side of said weight. Then, with the lever E swung sidewise in the position shown in Fig.

. 4., a downward movement of said lever will cause a partial rotation of the wheel Qand by reason of the spiral scroll e on said wheel the sliding bar B will, in a corresponding degree, be raised upward in the hollow standard a, and the sliding sleeve D will, in like manner and to the same degree, be raised up on said sliding bar, and by a succession of the up-anddown vibrations of the lever E the jack will be extended vertically to the required distance.

rest upon the upper end of the sliding sleeve Lil To lower a weight resting 011 the top of the jack or to shorten the height of said jack, the lever E should be swung sidewise into the position indicated by the dotted lines in Fig. 4, so that the spring-bolt e in the outer end of said lever will engage with the internal ratchetteeth on the standing rim 0, and then, by the up-and-down vibrations of the lever E, the wheel 0 will be rotated in a reverse direction, and thereby cause the sliding bar B and sliding sleeve D to move downward.

When preferred, the head-piece G and stirrup (1 may be dispensed with,and in such case the weight to be raised will rest directly on the upper end of the sliding sleeve D; and, when preferred, a crank or other similar wellknown device may be substituted for the lever E, to produce the rotations of the wheel G; but,while my invention includes such modifications, 1 preferably use said lever.

I claim as my invention I 1. In a lifting-jack, the combination, with the standard a, provided with transverse curved ribs a, the sliding sleeve'D, provided with transverse ribs (1, the sliding bar B,fitted 2 5 to said standard and sleeve, and the wheel 0,

journaled on said sliding bar, and provided with a spiral scroll, c, which engages the ribs a and d, and provided with ratchet-teeth, of

an operating-lever, E, pivoted to the wheel 0,

and provided with spring-catches 6, adapted to engage with the ratchet-teeth on said wheel, in the manner and for the purpose herein speci- 2. In a lifting-jack, the combinatiomwith a standard, a, provided with transverse curved ribs a, the sliding sleeve D, provided with transverse curved ribs d, and the sliding bar B,fitted to said standard and sleeve, as herein described, of the wheel 0, journaled to the sliding bar B,and provided with a spiral scroll, c, which engages with the ribs a and (l, to operate as and for the purpose specified.

CHARLES A. SULZMAN.

Vitnesses:

WM. H. Low, S. B. BREWER.

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