US812128A

US812128A - Lifting-jack.

Info

Publication number: US812128A
Application number: US24166705A
Authority: US
Inventors: William H Griffith
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-01-18
Filing date: 1905-01-18
Publication date: 1906-02-06
Anticipated expiration: 1923-02-06

Description

No. 812,128. PATENTED FEB. 6, 1906. W. H. GRIFFITH.

LIPTING JACK.

nruouzon FILED JAN-18, 1905.

WILLIAM H. GRIFFITH, OF WVORTHINGTON, INDIANA.

LlFTlNG-JACK.

Specification of Letters Patent.

Patented Feb. 6, 1906.

Application filed January 18, 1905. Serial No. 241,667.

To all whom it natty concern):

Be it known that I, WILLIAM H. GRIFFITH, a citizen of the United States, and a resident of WVorthington, in the county of Greene and State of Indiana, have invented a new and useful Improvement in Lifting Jacks, of which the following is a specification.

My invention relates to an improvement in lifting-jacks and to a species of liftingjacks which is capable of being converted into a bench-vise when the exigency for such use may arise; and the object is to provide a simple, powerful, quick acting lifting jack which is capable of easy and ready operation and manipulation; and it consists in certain novel features of construction and combinations of parts, which will be hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of my Improved lifting-jack. Fig. 2 is a broken view, partly in section. Fig; 3 is a detail with a portion of the mechanlsm removed. Fig. 4 is a broken view, partly in section, showing the parts in position to act as a vise; and Fig. 5 is an enlarged vertical section through a fragmentary portion of the lifting jack, showing a part of the runner C, chamber 3, and elements therein.

A represents the main bar or standard of my improved lifting-jack, and B is the base, to which the standard is preferably secured by a bolt 1 or similar means. A handle 2 at the upper end is provided for lifting and holding the jack in position.

C and D are the upper and lower runners, respectively. These are mounted to slide on the upright or bar A. The runner C is chambered out, as at 2 and 3, immediately beneath the point where the object to be lifted is to utilize space in the runner which would.

otherwise be lost and at a point almost directly beneath the load. This wedge-shaped block is recessed, as shown at 6, to receive the toothed grip-block 7, which is made of hard steel and the teeth of which are adapted to enga e the bar or standard and lock the runner a in position when the wedge shaped block is forced upwardly, and it is normally held upward by a spiral spring 8 beneath it and expanding upwardly thereagainst. This spring 8 not only thrusts the block upward into the V-shaped recess, but it also yields to permit the upper runner to be raised at any time, the teeth of the grip-block projecting downward to further assist in thisoperation.

As a means for unlocking the runner or releasing the grip-block from the bar or standard a cam-lever 10 is provided. This is connected by a pin 11 to the block 5, and this pin 11 operates in a slot 12, which is elongated and parallels the outer wall of the partition 4. The enlarged portion of the cam-lever is adapted to bear on a shoulder 13 when the cam-lever is moved to a horizontal position and by so doing to force the wedge-shaped block downward against the expansive action of the spring 8, and with it the grip-block, away from the bar or standard, thus permitting the runner to be lowered. The lower runner D is also provided with a toothed ripblock 14, which engages the rear edge of the upright or standard, the two grip-blocks being adapted normally to alternately take hold upon the bar or standard.

An L-shaped lever 15 is fulcrumed at 16 in the lower runner D, and the upper end is provided with a pin 17, which extends through the curved slot 18 in the upper runner C, and this pin 17 extends throu h to the other side, where it is connected with the hand-lever L, which latter is pivoted to the upper runner C. (Not shown.) A spring 19, interposed between the opposite end of L-shaped lever 15 and the upper end of the runner D, normally acts to retain the runner in operative position. A projection 20 on the rear upper side of the lower runner D is in position to be struck by the upper runner Cwhen the latter is lowered, whereby to tilt the lower runner D to cause the release of the grip-block 14 from the bar or standard and permit the runner to slide downwardly thereon.

To use the lifting-jack as a vise, the supplemental jaw J is used. This is provided with teeth 23, preferably 'to cooperate with the runner C, and it is held in place by the grip block 24. When used as a vise, the bar or standard A is preferably swung over into the horizontal position indicated in Fig. 4 and the runner C is operated by hand or lever to force it up into position to hold the article to be clamped rigidly between it and the jaw J. When not in use as a vise, the jaw J is removed from the lifting-jack.

In this way I not only provide a simple and efficient lifting-jack, but also a convenient form of vise into which the jack may be transformed at a moments notice.

Shght changes might be resorted to in the form and arrangement of the several parts described without departure from the spirit and scope of my invention, and hence I do not wish to limit myself to the exact construction herein set forth; but,

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

1. The combination with a lifting-jack, of a supplemental jaw arranged and adapted to cooperate with the movable parts of the lift- 1ng-jack whereby to form a vise.

2. The combination with the bar or standard of a lifting-jack, and runners mounted thereon, with means for automatically grip ping the runners to the bar or standard, of a supplemental jaw mounted on the bar or standard and adapted to cooperate with one of the runners whereby to transform the jack into a vise.

3. The combination with a base, and a bar or standard pivotally supported thereon, of runners mounted on the bar or standard, means for locking them thereto, and a supplemental jaw adapted to be employed to 006perate with the runner whereby the lifting-j ack may be transformed into a vise.

4. The combination with the bar or standard of a lifting-jack, of a runner havin "a V- shaped chamber therein located direct y beneath the load, a Wedge-shaped block-fitted to said chamber and carrying a grip-block, and a cam-leverfor forcing said V-shaped I block in one direction.

5. The combination with a bar or standard, of a runner having a V-shaped chamber therein located directly beneath the load, a wedge-shaped block fitted to said chamber and carrying a grip-block, a spring for moving said wedge-shaped block into position to cause the grip-block to lock the runner to the bar or standard, and means for releasing said block therefrom.

6. The combination with a bar or standard, of'a runner mounted to slide thereon and provided with a V-shaped chamber located directly beneath the load, a wedge-shaped block fitted therein, a grip-block carried by the wedge-shaped block, a spring for norrnally raising the wedge-shaped block, the

runner having a diagonallydisposed slot therein, a pin extendlng through this slot from the block, cam-lever mounted on the pin and adapted to engage a shoulder on the runner whereby to force the block against the action of the spring and release the runner from the bar or standard.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

WILLIAM H. GRIFFITH. Witnesses:

W. H. WVADswoRTH, J AS. A. YOOKEY. 1