US1315929A

US1315929A - Wiliiiam h

Info

Publication number: US1315929A
Authority: US
Publication date: 1919-09-09
Anticipated expiration: 1936-09-09

Description

W. H. GRIFFITH.

LIFTING JACK.y APPLICATION FILED NOV. 23, 19H. RENEWED JULY I4, i919.

1,315,929. Patentedsept. 9, 1919.

WILLIAM n; GRIFFITH, or woarrinisroiv, INnlIAIvA.

Specification of Letteiis i iPatented Sept. 9,

application" ala inventer as, 1917; serrer Nd. adatta, niifefi" zu'nlia, lea." sriai ne. aidait.

To all whom t may concern:

Be it known that I, `WILLIAM H. GRIFFITH, a citizen of the United States of America, residing at Worthington, in the county of Greene and State of Indiana, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specication.

My invention relates to an improvement in lifting j aclrs and the object is to dispense with bolts in large measure and otherwise reduce the number of parts in the working mechanism of the jack.

ln the accompanying drawings Figure 1, is a view in longitudinal section.

Fig. 2 is a vertical transverse section;

Fig. 3 is a view of the holder 5.

A, represents the main standard of my improved lifting j ack. B is the base to which the standard is secured by bolt or other means l.

C and D, are the upper and lower runners mounted and adapted to slide on the standard A, in the usual manner. An L-shaped lever A7 is provided with the U shaped bearings 2, one on either side whereby it is detachably pivoted between the two rounded studs 3, projected inwardly from opposite directions and the hand lever A1, is pivotally secured to the upper runner C, and also to the upper end of the L shaped lever A7.

A spiral spring 4c, housed within the lower y runner D, is interposed between one end of the l. shaped lever A7 and the wall of the runner for maintaining the normal locking position of the runner D, upon the bar or standard A, in the usual manner.

As a means for clutching the upper runner C, to the bar or standard, the holder A5 is provided. This has a hole 6, through it to receive and loosely lit the main standard A, upon which it may be said to float loosely and the end 7, of this holder A5, extends loosely into the recess 9, formed between the bolt hole in the upper runner C, and the wall thereof, as a pivotal point from which it is capable of a limited vibration and a spiral spring 8, inserted between this holder and the wall of the upper runner C, forces the holder A5 normally up to cause it to clutch upon the standard A.

In order to lift the load the runners are raised to a suitable height on the standard A, then the handle A1 is successively lowered and raised thus alternately lifting one runner C, and then the other runner D.

To lower the runners on the bar or standard, the handle A', is swung into suitable position to loosen the grip of the lower runner upon the standard A, and the operator presses the protruding end of the holder A5, down whereupon both runners C and D may be slid to the required position on the bar or standard A.

To lower the runners, by step by step m0- tion the handle A1 is pressed down by one hand and the end 7 of holder A5 by the other where it is held while the hand e is again raised until the runner C, has descended. The holder A5, is then released whereby it grips upon the bar or standard and holds the load at that point until the lower runner D, has been lowered in precisely the same manner except that the handle is lowered as the lower runner D, is pushed down. This method is continued until the load is lowered to any desired point.

To drop the load raise the trip until holder A5 is in released position, then raise the handle A1, until the runner C, descends striking the runner D, which will release both holders and drop the parts to the bottom of the bar or standard A.

I claim:

l. A lifting-jack containing a standard, two runners loosely mounted thereon, a han dle pivoted to one runner, a lever pivoted to the handle and to the other runner, and a holderhoused within one runner at a point between said pivots and the main or operative part of the runner, said runners and holder slidably mounted on the standard and held assembled by the standard.

2. A lifting-jack containing a standard, two runners loosely mounted thereon, a han* dle pivoted to one runner, a lever pivoted to the handle and to the other runner, a holder housed within one runner at a point between said pivots and the main or operative part of the runner, said runners and holder slid.- ably mounted on the standard and held assembled by the standard, a spring interposed between the holder and the runner in which it is housed, and another spring interposed between one end of the lever and the runner to which it is pivoted.

3. A lifting-jack having a' Standard, t'Wo Venting the lever from being detached from 10 hollow runners and a holder mounted to the stud and its runner. slide on the standard, the holder housed In testimony whereof I ax my signature Within one of the runners, a handle pivoted in the presence of two Witnesses. to one runner, an L-shaped lever pvoted to the handle and provided With a U-shaped VILLIAM H' GRIFFITH' bearing which detachably receives a stud n VVtnesseS:

one of the runners, said standard holding GEO. M. Norrnn,

the parts together and While in place pre- L. R. Boozn.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

' Washington, D. C.