US150498A - Improvement in lifting-jacks - Google Patents

Description

'N. WARREN.

Lifting-Jacks.

NOJBO 498, PatentedMay 5.1874.

WITNESSES. l |NVENTUR W ,dwai

NELSON WARREN, OF 'WILMINGTON, DELAWARE;

IMPROVEMENT IN LIFTlNG-JACKS.

Specification forming part of Letters Patent No.15lA98, dated May 5, 1874; application filed March 7, 1874.

To all whom it may concern:

Be it known that I, NELsoN WARREN, of Wilmington, in the county of New Castle and State of Delaware, have invented certain new and useful Improvements in Lifting-Jack; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

The nature of my invention relates to an improvement in lifting-jacks; and it consists in the peculiar arrangement and combination of devices, which will be more fully described hereafter, whereby a cheap, portable, and powerful jack is produced, and one which is not liable to be broken or get out of repair.

Figure 1 represents a side elevation of my ilwention. Fig. 2 is an edge view of the top part of the casting and frame.

a represents a triangular frame, made of two pieces of board secured together at their upper ends, and braced by a metallic cross-bar, I). This frame, having no base-plate, is peculiarly adapted to all kinds of surfaces, and can be used with case where others cannot be made to stand erect. The casting c, which forms a frame in which the operating lever d is pivoted, and through which the lifting-bar 0 works up and down, has a sooket,' formed on one side, so as to fit over the top of the frame a like a cap, and thus support the casting in position. The lifting-bar, of ordinary construction, has a projection, h, formed upon one side at the top, which serves as a handle by which the bar is lifted upward until its head, made slightly concave on top, strikes against the under side of the object to be raised, when the lever d is pressed downward. Upon the ing by a socket, and thus prevents any of the parts from being broken. J ournaled in the frame or castin 'ust back of the bar is a friction-roller, Z, against which the bar presses in its movements up and down, so as to make it move as easily as possible.

The operatinglever has but afew cogs formed upon the end which engages with the cogs of the bar, so that when raised upward at an angle of about sixty degrees their cogs will no longer engage, when the bar can be freely raised upward, or will fall from its own weight. After the lever has been depressed, raisin g the bar and its load upward, a pivoted latch or catch, 0, is turned over a small stud or projection, n, formed on the side of the lever, when the lever will be held in the position shown in. Fig. 1.

Having thus described -m y invention, I claim 1. The combination of the spring j and lifting-bar having the flange 6, substantially as set forth.

2. The lifting-bar provided with the lug 71, substantially as shown.

3. The combination of the frame a and cast- NELSON \VARREN.

Witnesses F. A. LEHMANN,

OLIVER P. WELoH.

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