US939374A

US939374A - Lifting-jack.

Info

Publication number: US939374A
Application number: US44622108A
Authority: US
Inventors: Francis M Allerton
Original assignee: OSCAR R ALLERTON; WARREN E ALLERTON
Current assignee: WARREN E ALLERTON; OSCAR R ALLERTON
Priority date: 1908-07-31
Filing date: 1908-07-31
Publication date: 1909-11-09
Anticipated expiration: 1926-11-09

Description

1?. M. ALLERTON.

LIFIING JACK. APPLIGATION FILED JULY 31. 1908.

Patented Nov. 9, 1909. I

UNITED sTArEs PATENT curios.

FRANCIS M. ALLERTON, OF BENTON HARBOR, MICHIGAN, ASSIGNOR OF ONE-THIRD TO OSCAR R. ALLEBTON, OF BENTON HARBOR, MICHIGAN, AND ONE-THIRD TO WARREN E; ALLERTON, OF CHICAGO, ILLINOIS.

LIFTING-JACK.

Specification of Letters Patent.

Patented Nov. 9, 1909.

To all whom it may concern:

Be it known that I, FRANoIs M. ALLERTON, a citizen of the United States of America, and resident of Benton Harbor, Berrien county, Michigan, have invented a certain new and useful Improvement in Lifting- Jacks, of which the following is a specification.

My invention relates to jacks, such, for example, as those for lifting wagons or other heavy structures. 7

The object of my invention is the provision of an improved and highly efficient lifting jack of such form and character that it will be comparatively cheap to manufacture, simple of operation and powerful in use, and convenient to handle and apply in the raising and lowering of wagons or other heavy structures.

To the foregoing and other useful ends, my invention consists in matters hereinafter set forth and claimed. 4

In the accompanying drawings :Figure l is a front elevation of a lifting jack, embodying the principles of my invention. Fig. 2 is a side elevation of the same. Fig. 3 is an enlarged horizontal sectional view on the line 33 in Fig. 1. Fig. 4 is a similar section on the line 4-4 in Fig. 1. Fig. 5 is a perspective of the step block or shoulder that is adjustable to different positions on the side of'the vertically movable member of the jack.

As thus illustrated, my invention comprises a stationary upright member A provided at its lower end with a suitable base a, whereby it may rest upon the floor or ground. A vertically disposed movable member B is provided interiorly with guideways 6 that are adapted to fit and slide upon the sides of the member A, as shown more clearly in Fig. 4. At its front, the member B is provided with two parallel and vertically disposed columns or rows of ratchet teeth C, the teeth of one row or column being staggered with relation to the teeth of the other row or column. At its upper end, the member A is provided with a concave seat or socket D in which rests a convex member d, the latter provided with a stem (1 In this way a ball and socket joint is provided, and the said stem is provided at its lower end with a pivot or fulcrum 0?, upon which is mounted the hand lever E. The said hand lever is provided preferably with a pair of notches e-e adapted to engage the said teeth on the member B.

Suppose that the member B is to be raised from the position shown in Fig. 2, so as to lift a wagon or other heavy structure. In such case 1 the operator will pull up on the lever E until the notch e thereon slides down far enough, to engage the tooth 1, and then by slight outward movement of the handle of the lever the notch e is disengaged from the tooth 2. The handle of the lever is then depressed until the notch e is in a position to engage the tooth 3, and after such engagement a slight lateral movement of the lever in the other direction will disengage the notch e from the tooth 1. This operation is continued until the member B is elevated to the desired height, the lever alternately engaging first one row of teeth and then the other. The weight to be elevated or raised is, of course, upon the member B, and in turn upon the lever E. The weight is then com municated from the said lever through the stem 03 to the member 03, and from the latter to the top of the member A, which latter is stationary. The lever can be of any suitable or desired length, and with the arrangement shown it exerts a very powerful lifting leverage. The operation of lowering the weight is obvious, and is accomplished by alternately disengaging the lever from first one row of teeth and then the other.

The weight can be supported upon the top of the member B. As a matter of further improvement, however, I provide the side of said member with hooked teeth 6 and with guide-ways b at each side of said teeth-that is to say, the said teeth extend in a vertical row between the two guideways. A step block or shoulder F is provided with portions f adapted to engage in said guide-ways b and with a lower foot or resting portion f adapted to engage the teeth (2 as shown more clearly in Fig. 1. This step block or shoulder F can, it will be seen, be raised and lowered by swinging out its lower end, so as to disengage the same from the teeth, the sliding connection provided being sufliciently loose to admit of this. Thus the said block or shoulder can be positioned at different heights, and the thing to be lifted can be rested thereon.

As shown, the two rows of teeth are on the movable member. It will be seen, however, that the device can simply be turned upside down, so that the teeth will then be on the stationary member. For this reason, therefore, I do not limit myself to the exact construction shown and described.

Vhat I claim as my invention is:

1. In a lifting jack, two relatively sliding members, two rows of teeth on one member, and a lever swiveled on the other member so as to move freely about a vertical axis, andadapted to engage the teeth of first one row and then the other.

2. In a lifting jack, two relatively movable members, two rows of teeth on one member, a ball and socket joint on the other member, and a lever attached to the ball and socket joint and adapted to engage the teeth of first one row and then the other.

3. In a lifting jack, two relatively movable members, two vertical rows of teeth on one member, a fulcrum on the other member, consisting of a universal joint disposed between said rows of teeth, and a lever on said fulcrum, adapted to engage said teeth.

4:. In a lifting ack, two relatively sliding members, two rows of teeth on one member, a ball and socket joint on the other member, disposed between said rows of teeth, a pivot carried by the ball and socket joint, and a lever on said pivot, adapted to engage said teeth, the teeth of one row being staggered with relation to those of the other row.

Signed by me at Benton Harbor, Mich, this 28th day of July 1908.

FRANCIS M. ALLERTON.

Witnesses ANDREW KI. SPINK, GEORGE S. Basswrtr.