US793169A - Lifting-jack. - Google Patents

Description

No. 793,169. PATENTED JUNE 27, 1905. G.T.ARNOLD.

LIFTING JACK.

APPLICATION FILED 1330.28, 1904.

I mi? GYM UNITED STATES Patented June 27, 1905.

PATENT OFFICE.

LIFTING-JACK- SPECIFICATION forming part of Letters Patent No. 793,169, dated June 27, 1905.

Application filed December 28,1904. Serial No; 238,602.

To (tZZ- whom, it nt/ty concern:

Be it known that I, CLAYTON T. ARNOLD, a citizen of the United States, residing at Dorraneeton, in the county of Luzerne and State of Pennsylvania,haveinvented a Lifting-Jack, of which the following is a specification.

The primary object of this invention is to provide a lifting-jack of the lever type which can be conveniently and effectually employed for pulling pipes, lifting heavy objects, and for the various other uses to which a device of this kind is put.

The invention contemplates the provision of a lifting-jack comprising simply a stout rocking base and a lever suitably fulcrumed on the upper part of said base and having peculiar means for changing its fulcrum-point and for attachment to the object to be lifted, all as hereinafter fully described in detail and more specifically set forth in the appended claims.

In the drawings which form a part of this specification, Figure 1 is a side elevation of my improved lifting-jack, showing the application of the same in pulling a pipe from the ground. Fig. 2 is a :front elevation of the device with the attaching-chain removed. Fig. 3 is an inverted plan view of the fulcrum end of the lever.

Like letters of reference indicate like parts in the several figures of the drawings.

Referring to said drawings, the letter A designates the rocking base or fulcrum of the device, and B the lever, the latter being fulcrumed in the upper part of the rocking base on a transverse pin C and provided with a chain D for attachment to the object to be lifted.

1n carrying out my invention the rocking base A comprises a curved foot piece or block a, from which rise a pair of castings or uprights (1 terminating at their upper ends in horizontal seats for the sectional bearingblocks If, in which latter the fulcrum-pin C is mounted and firmly held by set-screws c. The castings or uprights a are spaced apart, so that the lever may move between their upper ends, and at an intermediate point are connected together by cross-pieces so that the base as a whole will provide a stout and strong rocking support.

The lever 15 is a stout wooden bar, the inner end 7) of which is disposed at an angle of about thirty degrees with respect to the lower edge, and the lower corner, as 1/, is rounded, as shown. ()n this end of the lever and extending a short distance over the upper and lower edges thereof is a metal strap E, and that part of said strap which is at the lower edge of the lever is provided with a series of transverse semicircular bearings 0, adapted to [it over and bear upon the fulcrum-pin C of the rocking base or support. In conjunction with these hearings t. and for the purpose of securely connecting the lever to the fulcrum-pin of the supporting-base is a hinged plate F, having a series of semicircular bearings f, corresponding exactly with and opposed to the bearings v. This plate F is hinged at f to the metal strap E, and the outer or free end is slotted to receive a loop or eye 0, through which latter is passed a pin /I, which holds said plate against the strap.

In changing the fulcrum-point of the lever the plate F is released and swung down to rest upon the cross-pieces a" of the supportingbase, and after the lever is shifted on the latter to bring it to a different bearing the said plate is again brought against the lever or strap thereon and locked. It will thus be seen that the bearings c and together form a series of circular bearings in any one of which the fulcrum-pin of the supporting-base may be journaled.

The end b of the lever B is cut away centrally, as shown, to provide a transverse opening If, which communicates with an opening 0 in the strap E, and through these openings the chain 1) is passed and crossed, providing a loop beyond the end of the lever, which loop is adapted to embrace the pipe or other object to be lifted. The chain 1) is securely connected to the lever by engaging links of said chain with stout hooks Z, secured to opposite sides of the lover.

The device is ogerated very much after the manner of the ordinary fulcrumed lever; but the provision of the rocking base and the other novel features not only increases the effectiveness of the improved lifting-jack in its various applications, but also adds to its convenience of manipulation.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a lifting-jack, the combination, of a rocking base or fulcrum comprising an upwardly-curved foot piece or block and uprights rising therefrom, a lever fulcrunied between the upper ends of the uprights, and a chain detachably connected to the inner end of the lever, substantially as shown and described.

2. In a lifting-jack, the combination, of a lever, and a base or fulcrum therefor comprising a curved foot piece or block, uprights rising therefronn and connected together intermediately, bearing-blocks on said uprights, and a fulcrum-pin mounted in said bearingblocks and upon Which fulcrum-pin the lever is fulcrumed, substantially as shown and described.

3. In a lifting-jack, the combination; of a rocking base or fulcrum having a transverse fulcrum-pin, and a lever having a series of transverse bearings on its under side adapted to receive the fulcrum-pin, hooks secured to opposite sides of the lever, and an attachingchain engaging the hooks, substantially as shown and described.

4. In a lifting-jack, the combination, of a rocking base or fulcrum having a transverse fulcrum-pin, and a lever having a metal strap attached to its inner end andjextending along the upper and lower edges thereof, that part of the strap at the lower edge of the lever being provided with transverse semicircular recesses or bearings, a plate hinged to the strap and provided with transverse rece'sses or bearings corresponding with and opposed to the aforesaid recesses or bearings, and locking means for said plate; together with a chain or flexible connection secured to the end of the lever, substantially as shown and described.

5. In a lifting-jack, the combination, of a rocking base or fulcrum having a transverse fulcrum-pin, and a lever having a metal strap attached to its inner end and providing bearings to receive the fulcrum-pin, the end of the lever having "a transverse openin terninuhicating with an opening thrdiigh, the metal strap; tcg'ether with an attaching-chain passed through the openingsand hook's' sec'u'r'ed to oppositesides of the lever and with which the links of the chain engage, substantially as shown anddescribed'. v U p In testimony whereof i have signed my name to this specification in the presence of two siibscribing witnesses. V

cnAYToN T. ARNOLD.

Witnessesi ALFRED W. GREEN, A. HAROLD HAND.

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