US821769A

US821769A - Lifting-jack.

Info

Publication number: US821769A
Application number: US22877004A
Authority: US
Inventors: William Trewhella
Original assignee: Individual
Current assignee: Individual
Priority date: 1904-10-17
Filing date: 1904-10-17
Publication date: 1906-05-29
Anticipated expiration: 1923-05-29

Description

APPLICATION FILED 0CT.17, 1904.

PATENTED MAY 29, 1906.

2 SHEETS-SHEET l.

i F 5 7T No. 821,769. PATENTED MAY 29, 1906. W. TREWHELLA.

LIFTING JACK.

APPLICATION FILED OGT.17, 1904.

2 SHEETS-SHEET 2 WVILLIAM TREWHELLA, OF TRENTHAM, VICTORIA, TO HIMSELF AND BENJAMIN TREWHELLA, OF

AUSTRALIA.

AUSTRALIA, ASSIGNOR TRENTHAM, VICTORIA,

LlFTlNG-JACK- Specification of Letters Patent.

katented May 29, 1906.

Application filed October 17, 1904. Serial No 228,770.

To all whom, it ntay concern:

Be it known that 1, WILLIAM TREWHELLA, a subject of the King of Great Britain, residing at Trentham, in the State of Victoria, Commonwealth of Australia, have invented a Lifting-Jack, of which the following is a specification.

This invention relates to lifting-jacks, and in particular to lever-operated jacks in which the casing is employed to carry the weight on a claw or rest or on the top, said casing being raised or lowered by means of pawl-andratchet mechanism or hydraulically.

The especial feature of the invention is to rovide a load-carrying casing that is nonrotatable, the casing being constructed to slide on and be guided by the standard or rack and provided, substantially as shown in the accompanying drawings, with a top plate and three or more rests arranged thereon at different levels and in different vertical planes. The effect of this is that the weight may readily be taken at various heights, and the lever can be worked in narrow passages by employing one of the rests, which would project at right angles to said passage, so that the lever could be operated longitudinally therein.

The accompanying drawings illustrate the invention and comprise, in Figure 1, a side elevation, Fig. 2 a front elevation, and Fig. 3 a plan, of a lifting-jack which can be operated by pawl-and-ratchet mechanism in the well-known manner and formed with five rests, including one formed by the top of the casing. Figs. 4, 5, and 6 are respectively similar views of a lifting-jack which can be operated hydraulically in the wellknown manner and provided with four rests, including the top.

- different levels,

Referring now to the drawings, Arepresents the rack-bar, which in the kind of jack referred to, Figs. 1, 2, and 3, is stationary, and B the ram-cylinder of a hydraulic jack shown in Figs. 4, 5, and 6. The casing C, which is adapted .to be raised and lowered by the power employed, is provided with a number of rests D E F G H, formed on the different sides thereof, each being adapted to take the weight at different levels, as before mentioned.

J represents the squared end of a rocker or crank pin to which a lever or pump-handle may be attached to work the jack.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be per formed, I declare that what I claim is- 1. A lifting-jack of the type described comprising a support and a non-rotatable casing slidable vertically thereon, said casing closed at top to form one rest for a load to be lifted and provided between its upper and lower ends with a plurality of other fixed rests at for the purposes set forth.

2. A lifting-jack of the type described comprising a support and a non-rotatable casing slidable vertically thereon, said casing closed at top to form one rest for a load to be lifted, and provided between its upper and lower ends with a plurality of other fixed rests at different levels and in different vertical planes, for the purposes set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

EDWARD WATERS, EDWARD NEEDHAM AWATERS.