US390671A - Lifting-jack - Google Patents

Description

(No Model.)

L. B. HOIT.

LIFTING JACK. No. 390,671. Patented Oct. 9, 1888.

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8 @W' fiame, lb B NITEID STATES I PATENT Cri ical LORA B. HOIT, OF WORCESTER, I\IASSAOHUSETTS.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 390,671, dated October 9, 1888.

Application filed December 14, 1887. Serial No. 257,847. (No model.)

To aZZ whom it may concern:

Be it known that I, LORA B. Hour, of Worcester, in the county of \Vorcest'er and State of Massachusetts, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The object of my invention is to provide a lifting-jack that can be thrown under an axle without the lever becoming separated from the standard; also, to provide means whereby the axle shall be prevented from slipping down the lever or binding against the standard when lifting on a high pitch; and also to increase the leverage without lengthening the lever.

My invention consists in the several details of construction and arrangement, as fully set forth in the following specification and claim.

In the drawings, Figure 1 is a perspective view of my improved lifting-jack, and Fig. 2 is a vertical section.

Similar letters of reference indicate similar parts in the respective figures.

A is the standard, which is made of malleable metal, and provided on the lower portion of its front edge with a series of notches, a, and on the upper portion of its rear edge with a series of notches, a. The upper end of the standard is formed into a hook, at", for a purpose hereinafter described.

B is a metal concave shell, which serves asa base to support the standard A. The base B is provided with a slot or mortise, b, and the lower end of the standard A with a tenon, b, which fits into the mortise, and is secured therein by means of a rivet N, Fig. 1; or

the base and standard may be secured together by hammering out the end of the tenon on the standard to form a rivct-head, as shown in Fig. 2.

O is a lever longitudinally slotted at 0, so as to adapt it' to fit over the standard in the manner shown. Each side of the forward end of the said leveris provided with a metallic plate, D, the plates being riveted to thelever and to each other by rivets d. The central rivet, d, constitutes the fulcrum of the lever, and is adapted to rest in any of the notches a. The central rivet, d, is so located as to make the c somewhat less than the width of the hookshaped top of the standard, for the purpose of preventing the lever from slipping off the standard unless the long end of the lever is lowered, when it can be taken off.

The plates D are provided with lugs or ears d which extend upward above the upper face of the lever O, and are for the purpose of preventspace between it and the front edge of the slot ing the axle from binding against the standard I or slipping down on the lever when lifting on a high pitch. The plates Dalso serve as aprotection to the end of the lever O and keep it from being cut away by constantly coming in contact with the axles of carriages.

E is a shackle or link loosely hung to the top of the lever O, and held thereto by a plate or cap, 6, riveted to the lever. The forward end of the shackle or link is fitted to enter any of the notches a at the front edge of thestandard.

By making the standard and base-support of metal and riveting them together a very durable article is produced, as they are not likely to get loose, and will not rot, as is the case where wood or wood and iron are used. The peculiar construction of the base gives it strength without great weight. By making the standard of this class of jacks of malleable metal instead of wood, or wood strengthened with iron plates, the width of the standard can be reducedone-half and still retain strength sufficient for all ordinary purposes; and by having the standard narrower the fulcrum-point of the lever can be brought nearer to its lifting end than heretofore, and thereby increase the leverage without lengthening the long arm or shortening the short arm.

In using jacks of this class it is a common occurrence for the operator to swing the jack under the body of the carriage to be lifted, simply holding it by the lever; but in doing this the lever often slips off the standard and so causes annoyance and delay. To obviate this difficulty is the object of the hook on the upper end of the standard, which will engage with the fulcrum-rivet d and allow the standard to swing freely without danger of being detached from the lever.

Having described my invention, I claim- The herein described lifting -jack, which consists ofthe following elements, viz: a hot to the lever and fitted to enter either of the low base, astandard riveted thereto, said standnotches at the front edge of the standard, all ard being provided with a series of notches at arranged and eo operating substantially as its front and rear edges and having a hook at specified.

5 its upper end, aleverhavingafulerum adapted In testimony whereof I have hereunto set my 15 to rest in either of the notches at the rear edge hand and seal.

0f the standard, metal plates riveted to the sides LORA 1-3. 11011. [In l] of thelever at its lifting end, said plates having Vitnesses: lugs extending upwardly above the upper face HENRY M. BOYD,

[O of the lever, and a shackle orlink loosely hung XVM. CARL.

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