US843292A

US843292A - Lever-jack.

Info

Publication number: US843292A
Application number: US30852006A
Authority: US
Inventors: Angus A Mcintosh
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-03-28
Filing date: 1906-03-28
Publication date: 1907-02-05
Anticipated expiration: 1924-02-05

Description

No. 843,292. PATENTED FEB. 5, 1907.

A. A. MOINTOSH.

' LEVER JACK. APPLICATION FILED MAR. 2B, 1906.

Tn: NORRIS PETERS C0,, wAsHmaraN, 0.1:.

TINTTE ST'LE S PATENT FFIOE.

ANGUS A. MoINTOSI-I, OF ALEXANDRIA, ONTARIO, CANADA.

LEVER-JACK- Specification of Letters Patent.

Patented Feb. 5, 1907.

Application filed March 28. 1906. Serial No. 308,520.

To (LU IU/LOIII/ it may concern.-

in Lever-Jacks; 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 appertains to make and use the same.

Thisinvention relates to lever-jacks; and a prime object is the provision of means for raising frames of buildings and the like, as well as telephone and telegraph poles from a horizontal to a vertical position.

A further object is the provision of a simple, strong, durable, and efficient apparatus for effecting this purpose easily, quickly, and with the least exertion of power.

My invention further consists in certain novel features and combinations of parts,

' together with their equivalents, such as are disclosed in the present embodiment and in the accompanying drawings, in which Figure l is a side view of my invention, showing the manner of its use. Fig. 2 is a detail view of the lever, and Fig. 3 is a similar detail view of the shoe.

I11 the present embodiment of my invenj tion, A indicates a suitable lever, one end of which is provided with a head 1, preferably rounded and provided with suitable teeth or spikes 2, designed to take into the supportas, for instance, the beam 3.

The arm 4 is pivotally connected at one end to the head and eccentrically thereof in any suitable manner, as at 5, at a point above and slightly in the rear of the teeth 2, said arm adapted to project at an incline forwardly of the head 1 and being of suflicient length to engage and support the article which is to be raised, the free end of the arm, which lies above and in advance of the head 1, engaging or being attached to the article in any suitable manner.

The lever may be provided with a flange or lug 6, located in the rear of the pivotal point 5 of the arm 4, to which flange is pivotally secured one end of a curved shoe 7, the opposite end of which may be provided with teeth or spikes, as at 8, adapted to take into the beam 3, for instance.

In operation the article to be raised is tilted until the free end of the arm 4 can suitably engage or be attached to the same,

whereupon the

teeth

2 and 8 are caused to take into the beam 3 or other support to prevent the device from slipping backward. The free end of the lever is then forced downwardly on the pivotal point 9 of the shoe and lever as a center, such downward movement of the free end of the lever operating to j raise the head 1, disengaging the teeth 2i'ro1n the support on which the device is placed and also raising the frame, pole, or other article somewhat, the teeth 8 of the shoe 7 supporting the entire weight of the article and permitting the head to be moved forward slightly on the pivot-point 9. On the upstroke of the lever the shoe 7 is drawn forward toward the head 1 or caused to take a step forward, the article engaged by the device being again slightly raised toward its vertical position, the

teeth

2 and 8 being inclined rearwardly to permit of their being withdrawn from the support 3 as the lever is reciprocated, owing to the fact that the lower end of the arm is eccentrically secured to the rounded head of the lever and in advance of the fulcrum member 7.

The head of the lever may be provided with one or more fOl'WZt-ltllY-PIOjOCtlIlg teeth 10,if desired, to enable the head to take into the support as the head is moved forward and also to prevent the head from slipping rearwardly as the lever is rocked in its upward stroke on the circular periphery.

From the foregoing it will be observed that alternate movement of the lever causes the device to creep forward in one direction steadily to gradually raise the article to a vertical position easily and at the least expenditure of time and labor.

It is evident that changes might be made in the form and arrangement of the several parts described without departing from the spirit and scope of my invention, and hencr I do not wish to limit myself to the exact construction herein set forth.

Having thus fully described my invention, what I claim as new is 1. A lever-jack comprising a lever, arounded head at one end thereof, holding means carried by the head, an arm pivotally secured to the head and projecting forwardly therefrom, a shoe pivotally secured to the lever at a point in the rear of the head, and holding means on the shoe.

2. A lever-jack comprising a lever, one end of which engages a suitable support, an arm pivoted to the lower end of the lever and pro- IIO jecting in advance thereof, and a shoe pivotally connected near the lower end of the lever in the rear of the pivotal connection of the arm and lever.

3. Alever-jaek comprising alever, a rounded head formed'at one end of the lever, an arm, one end of which is pivoted to the head eccentrically thereof, and a fulcrum member pivotally secured to the lever at a point rear- Wardly of the point of engagement of the arm and head.

4. A lever-jack comprising a lever, an enlarged head formed at one end of the lever, projecting holding means carried by the head, a forwardly-projecting arm pivotally secured at one end to the head, a fulcrum member pivotally secured at one end to the lever and rearwardly of the head, and rearwardly-projecting teeth on the member.

5. A lever-jack comprising a lever, an arm pivotally secured at one end to the lever, a flange depending from the lever at a point rearwardly of the pivotal point of the arm of the lever and a curved shoe, one end of which is pivotally secured to the flange.

6. A jack comprising a lever, the lower end of which lever is "provided with a curved bearing-surface, a lifting-arm pivotally secured to the lever near its fulcrum-point, the lifting-arm being relatively long, and a curved 0 and relatively short supporting member pivotally secured at one end to the lever at a point behind the connection of the liftingarm and lever. In testimony whereof I a'lliX my signature 3 in presence of two witnesses.

ANGUS A. MOINTOSH. Witnesses AeNEs H. BURKE, HoRAoE M. SANFORD.