US549174A - Lifting-jack - Google Patents

Description

(No Model.)

E. D. WATKINS.

LIFTING JACK.

Patented NOV. 5, 1895.

UNITED STATES PATENT OFFICE.

EDWIN D. IVATKINS, OF LIMA, NEW YORK, ASSIGN OR OF ONE-HALF TO F. CBROWN, OF PORTLAND, MAINE.

LIFTING-JACK.

SPECIFICATION forming part of Letters Patent No. 549,174, dated November 5, 1895. Application nednmh 5,1895. serial No. 540,542. (No moda.)

This invention contemplates certain new and useful improvements in lifting-jacks, and has for its object the production of a simple device of this character comprising` advantages in point of inexpensiveness and durability.

The invention comprises the novel features of construction, and also the detail combina- 5o tion.

tion and arrangement of parts, substantially as hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is a view in side elevation. Fig. 2 is a vertical sectional view on the line .r 0c, Fig. 3. Fig. 3 is a horizontal sectional view. Figs. 4 and 5 are views of slightly-modied forms of my invention.

Referring to the drawings, A designates a post or upright secured at its lower end to a base-board c. This post is preferably oblong in horizontal cross-section, and to its opposite narrow sides are secured two plates a and a2, the former having a flange or shoulder a3 projecting outwardly therefrom, and the latter c2 an eye or loop c4. These plates may be secured to the post at any point, and two sets may be employed arranged at different heights, if desired.

B is a lifting-lever fulcrumed on the post, so that it can be moved up and down, and also have a limited movement longitudinally of its length. It comprises an arm b, having a tubular portion b', in which fits the leverhandle, and a bifurcated angular portion b2, having parallel side arms b3. This latter portion encompasses the post, and the lever is fulcrumed by a pin b, held by loop d4, the ends of said pin projecting into opposite slots b5 in the side arms h3 of said bifurcated por- These slots permit the lever to slide,

so that the outer ends of said side arms may be moved toward or away from the post. These latter ends of said arms are connected by a cross-bar C, which is flattened at d, so as to fit firmly upon the flange or shoulder c3. To this cross-bar C is connected, or it may be formed integral therewith, a plate D, having a series of recesses or shoulders d designed to engage the article to be lifted. Vhen such article is raised, the handled end of the lever is lowered into nearly a parallel plane with the post, and the cross-bar C rests upon the fiange or shoulder a3, the lever being moved longitudinally on its fulcrum-pin in seating said cross-bar. rlhis throws the upper end of the lever about on a line with the center of gravity, and the shoulder supports the lever and the article engaged thereby. To lock the lever in this position a locking-pin E is inserted through the corresponding slots in the parallel side arms of the bifurcated end of the lever. This prevents the lever from slipping and retains the stepped end thereof on the flange or shoulder. This locking-pin is preferably attached to one side of post A by a chain e. j Y

In practice the cross-bar C is freed from engagement with the flange or shoulder byelevating the handled end of said lever, the locking-pin being first removed from the slots in the side arms. In applying the jack one of the recesses or shoulders of the stepped end of the lever is brought beneath the object to be raised (or the loop of a chain or rope is made-to engage therewith) and the lever is then forced d own at its handled end until the other end thereof is on a line with the flange or shoulder c3, and by a slight longitudinal movement the cross-bars at said end will fit snug thereon, after which the locking-pin is inserted through the slots in the parallel arms and the lever is held firm, slipping from the flange or shoulder being thus prevented.

In Fig. 5 I have shown a slight modification of my invention, whereby the jack is specially constructed for use in liftingrails or beams. From the bifurcated end of the lifting-arm depends a pair of gripping-arms F, held by chains f. In Fig. 6 I have shown IOO the jack provided with two movable series of stepped or shouldered blocks G, connected to the bifurcated end of the lever.

The advantages of my invention are apparent to those skilled in the art, and it will be specially observed that a jack constructed as herein described is extremely simple, inexpensive, and durable, and is capable of being easily operated.

I claim as my inventionl. The herein-described lifting jack, comprising a post or upright provided with a flange or shoulder, a lifting. lever fulorumhed on said post and provided with a slot so" as tot have a limited longitudinal movement, and having a stepped or shouldered end which is designed to engage and rest upon said flange or shoulder, and a locking pin designed to be inserted through said slot for looking said lever when its said end is in engagement with said flange or shoulder, substantially as set i forth.

2. The herein-described lifting jack comprising a post or upright having a flange or shoulder, and a fulcruin pin, the lifting lever having a bifurcated portion provided with opposite slots to accommodate said pin and a cross-bar connecting the sides of said bifurcated portion and designed to engage said flange or shoulder, a locking pin designed to be inserted through said slots, and an engaging device connected to said cross-bar, substantially as set forth.

3. The herein-described lifting jack comprising the post or upright having two plates secured to its opposite sides, one of said plates having a flange or shoulder and the other an eye, a fulcrum pin fitted in said eye, the lifting lever having a bifurcated portion pro- 3vided with opposite slots to accommodate

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