US268371A - Truman j - Google Patents

Description

(Nomad.)

T. J. PEARE.

LIFTING JACK.

No. 268,371. Patented Nov. 28, 1882.

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' UNITED STATES PATENT OFFICE.

TRUMAN J. PEAROE, OF OAKLAND, CALIFORNIA, ASSIGNOR OF ONE-HALF l TO LESTER BISHOP, OF SAME PLACE.

LlFTIvNG-JACK.

SPECIFICATION forming part of Letters Patent No. 268,371, dated November 28, 1882.

Application ined May 15, 1882. '(No model.)

.To all whom Iit may concern Be it known that I, TRUMAN J. PEARCE, of Oakland, in the county of Alameda and State of California, have made and invented a new and usefullmprovement in Lifting-Jacks; and I do hereby declare that the following is a full, clear, and exact description of the same, reference beingV had to the accompanying drawlngs. V

My invention relates to an improved construction of lifting-jacks for carriages, wagons, and other light work. The object sought to be attained is to produce a strong and durableimplement at a low cost, and to `afford better facilities for handling and operatin g it in position where application of the power required to work it cannot be readily or`directly made in the line of the actuating-lever. rfhese objects I attain in the manner which I will now proceed to describe.

The accompanying drawings form a part of this specification and illustrate the invention.

. Figure l is a side elevation of the device with the hand-lever slightly elevated. Fig. 2 is a plan view ot' the same. Fig. 3 is a side elevation with the lever brought to a horizontal position.

Similar letters of reference indicate correspondin g parts in all the figures.

The post or standard A and the lift B may be made of some suitable wood combining required strength with lightness. rlhe top of the lift is notched or stepped to enable it to pass under and operate on different heights ot'axles, two or more of these steps b being provided, according to the width of the lift or the range of adjustability to be given to the jack. The faces of 'thesesteps are shod with iron plates b', to prevent wear and breakage. That portion of the post which` the lift works on is reduced in thickness, so as to give lightness with a suitable margin of strength and the part below, forming foot of the standard, is carried of full width, nearlyequal to .the width of the lift above it, to give proper stability. At the top and bottom ends of the lift a strap, D, is secured in position to embrace the standard and slide smoothly upon it as vertical movement is given tothe lift, and against one side of the standard, at a point between the 5o two straps, the operating-lever E is pivoted. This lever, while made of any required length, has its inner end formed into a broad and flat head, somewhat of a curved shape, so as to give increased breadth at this part around and above the fulcrum, and it is carried out beyond the standard and behind the fulcrnm,

so as to extend along the side of the lift. The object of this construction is twofold first,

t0 acord different points of attachment on the 6o head for the outer end of the link G, by which the position or angle of inclination of the lever can be kept as nearly as possible to the horizontal at the time the lift is set up; and, secondly, to give a brace or support along and against the side of the link, so that no lateral pressure or strain derived from any unequal weight on the end of the lift shall act directly upon the link. This gives a very strong connection of the lift and standard without the 7o necessity7 of employing cheek-pieces, ribs, and grooves, or other construction to prevent lateral movement.

In such kinds of lifting-jacks where its position, when in use, frequently renders it diflicult to reach and work the hand-lever with sufl'icient application of force to bring 'the lift to the required height, I find a great advantage is obtained by making the connection of the end of the curved link with the lever at such 8o point that when the lift is raised to the required height the t'hree points will be brought into line at the time the lever approaches a horizontal or nearly horizontal position. In such case the force required to raise the weightcan be more directly and elfectively applied than in other constructions where the outer end of the lever requires to be pressed down nearly to the grou-nd, because the diiiiculty of applying pressure increases as the end of the lever 9o passes beyond the horizontal line. The end of the curved link can be attached to the lever at several dii'erent points, h, which are provided in the enlarged head of the lever above its fulcrum, so that a longer or shorter movcment can be given to the lift, according as one or the other of the steps or notches is brought into service.

Having thus fully described my invention, tached to the lift at one end, and having ad- 1o what I claim, and desire to secure by Letters jnsteble attachment to the lever at points Patent, isabove the fulcrum thereof.

The herein-described lifting-jack, consisting /Vitness my hand and seal. of the standard with its foot, the ste) ed lift, the straps connecting said lift to the stgndard, TRUMAN J' PEARGE [L S l the pivoted lever having the enlarged head Witnesses: projecting beyond the standard and against D. SELLECK, the side of the lift, and the curved link at- EDWARD E. OSBORN.

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