US772238A - Jack. - Google Patents

Description

No. 772.238. PATENTED OUT. 11, 1904.

1 I. JEFFERSON.

JACK. v

I APPLICATION FILED FEB. a. 1904. NO MODEL.

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, balls 4. A block 5 is mounted upon the base UNITED STATES Patented October 11, 1904.

PATENT OFFICE.

JACK.

SPECIFICATION formingpart of Letters Patent No. 772,238, dated October 11, 1904.

Application filed February 3, 1904.

T0 at whom, it may concern.-

Be it known that I, ISAAC JEFFERSON, a citizen of the United States, residing at Langston, in the county of Logan and Territory of Oklahoma, have invented new and useful Improvements in Jacks, of which the following is a specification.

My invention relates to new and useful improvements in jacks especially adapted for railway purposes; and its object is to provide a simple device of this character having a supporting-screw which can be readily rotated in either direction.

- A further object is to provide an operating-lever which can be quickly detached from the body of the jack.

With the above and other objects in view the invention consists of a base upon which is revolubly mounted a block which engages the screw of the jack. This block has teeth upon the periphery thereof adapted to be engaged by the ends of arms pivoted in oppo' site sides of an operating-lever.

The invention also consists in the further novel construction and combination of parts hereinafter more fully described and claimed, and illustrated in the accompanying drawings, showing the preferred form of my invention, and in which Figure '1 is a perspective view of the jack. Fig. 2 is a top plan view thereof, partly broken away; and Fig. 3 is a section on' line 3 3, Fig. 2.

Referring to the figures by numerals of reference, 1 is a base having an annular flange 2 at the upper end thereof and provided with a circular groove 3, which forms a race for and also has a race 6 for the reception of the balls. A sleeve 7 is secured to the block and engages the flange 2, and this sleeve prevents the block from becoming accidentally detached from the base. A screw-threaded passage extends through the block 5 and is engaged by a screw 8, adapted to. project into an aperture 9, formed in base 1. This screw Serial No- 191,893. (No model.)

block, and the other half is inclosed by ahead 18, which is hinged to one side of 'yoke 11 and is adapted with said yoke to completely inclose the block. The head and yoke may be secured in position about the block bymeans of a spring-plate 14:, adapted to engage one or' more pins 15. The sides of the yoke 11 are slotted, as shown at 16, and within these slots are pivoted arms 17, which extend longitudinally of the lever 12 and are normally pressed in opposite directions therefrom by springs 18. The inner ends of the arms 17 normally engage teeth 19, which are produced in the periphery of the block by the formation of apertures.

When it is desired to raise an object by means of this device, the base 1 is placed in position thereunder with the head 10 against the object to be raised. The block 5is then rotated by oscillating lever 12 and the arms 17 connected thereto. When the lever is swung in one direction, only one arm 17 will engage the teeth on the block, while the other arm will slip thereover, and when the lever is returned to its normal position one or both of the arms must be pressed toward the lever so as to disengage them from the block. By

providing a lever and arms of the arrangement shown the block can be readily rotated in either direction, so as to move the screw upward or downward, as desired, when the block is rotated. To detach the lever from the block, it is merely necessary to spring the plate 14 off of the pins 15, and the head 13 can then be swung backward on its hinge. The balls 1 permit the block to be readily rotated when under heavy pressure.

The entire device is very simple, compact, and eflicient.

In the foregoing description I have shown the preferred form of my invention; butIdo not limit myself thereto, as I am aware that modifications may be made therein without departing from the spirit or sacrificing any of the advantages thereof, and I therefore reserve the right to make such changes as fairly fall Within the scope of my invention.

Having thus fully described the invention, what is claimed as new is 1. The combination with a base having an annular flange, a block supported by the base and having teeth therearound, and a retaining-sleeve secured to the block and engaging the flange; of a screw engaging the block, a lever revolubly mounted upon the block, and oppositely-disposed spring-pressed arms connected to the lever and normally engaging the teeth.

2. The combination with a base having an annular flange, a block supported upon the base, and a retaining-sleeve secured to the block and engaging the flange; of a yoke revolubl y mounted upon the block, a head hinged thereto, means for securing the head and yoke together to inclose the block, oppositely-disposed spring-pressed arms pivoted in the yoke and normally engaging the opposite sides of the block, and a screw revolubly mounted within the block.-

3. The combination with a base having an 20 ISAAC JEFFERSON.

Witnesses:

HAYWARD I. HARDEN, P. T. ZEIGLER.

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