US406523A - Lifting-jack - Google Patents

Description

- (No Modl.)

J. P. HAYS.

LIPTING JAGK i 10.406,523. Patented July 9, 1889.

M .4 /f v v N. PETERS, Pholvlilhognphcr. Wallington. ILC.

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UNITED STATES y.

PATENT OFFICE.

JAMES I). I'IAYS, OF NORTH TEMESCAL, CALIFORNIA.

` LIFTINe-JAGK.

SPECIFICATION forming part of Letters Patent No. 406,523, dated JulylQ, 1889. l Application filed January 16, 1889i lSerial No. 296,547. (No model.)

.To all whom. it may concern/.- v

Be it known that I,'.IAMES P. HAYS, of North Temescal, in the county of Alameda and State of California, have invented an Improvement in Lifting- Jacks; and I hereby declare the following to be a full, clear, and exact der" scription thereof. y

My invention relates to the class of liftingjacks; and my invention consists in the novel A construction, combination, and arrangement of standard, lift, lever, clutch, and arm, which I shall hereinafter fully describe.

The object of my invention is to'provide a simple and readily-adjustableliftingjack. i

Referring to the accompanying drawing, the iigure is a view of my liftingvjack.

A is the standard. B is the lift, having an eye or socket hitted over the standard, adapting it to be movedV The lift has a downwardly-er;``

vertically. tended arm b', having a socket oreye b2 on its end, fitted upon the standard below, and

serving as a guide to render the vertical move` i or guide socket b2 of thelift B.

D are links pivoted to the upturned ends c of the lever and to the lift B.

E is the clutch. This consists of a ring tted freely upon the standard. It has a stem e, which is pivoted at e between the forked upturned ends of the lever C.

The operation of these parts is as follows: When in a state of rest, the parts are all held up at any position on the standard to which they may have been adj usted by the clutchring E, which, under the weight of said parts, turns on its pivot c', so as to cramp upon the standard by getting out of a horizontal plane. The clutch thus fixed serves as a fixed fulcrum, about which the lever C may now be moved, in order to bring its upturned ends and the links D into alignment, which thereby elevates the lift up to the weight to be raised, and continued movement under the same conditions raises the weight upon the lift until i the lever ends and links, passingthe vertical,

are stopped by a cross-pin c in the fork ofthe lever coming in contact with the standard,

and the part-s are held in this position, the 'clutch-ring still engaging the standard and 'serving as a support for the lift and weight. Y i In order tovallow the parts to be readily moved down on the standard to primarily adjust them, I provide the stem e. of the clutchring..` E with an upwardly-extending arm F. By pressing upon this arm, so as tobring it parallel with the standard, the clutch-ring E is brought to a horizontal, and thus ceases to bind or cramp upon the standard, so that all the parts may be allowed to descend. TheV arm F also serves the further purpose of a limiting-stop for thel clutch-ring when by i means of the lever C all the `parts are bodily run up on the standard to adjust themprif marily in the neighborhood of the welght to be raised VIt serves thispurpose by coming in contact With the standard, and thereby preventing the clutch-ring from cramping in the wrong direction, which it has a tendency to do when lifted by the lever C.

I may, if desired for greater security, pro-V vide the stem e of the clutch-ring E with a fixed pawl G, which is adapted to engage notches or teeth g, formed on the standard when the clutch cramps under the Weight of the load, as heretofore described; but when the arm F is pressed inwardly the pawl G is thereby thrown out from its engagement.

Having thus described my invention, whatI claim as new, and desire to secure by Letters Patent, isn l. In a lifting-jack, the combination of a standard, a lift vertically movable thereon, a lever connected with the lift, and a clutch connected with the lever and engaging the standard, said clutch forming the fulcruln for the lever and support for the lift, substantially as described.

2. In a lifting-jack, the combination of a standard, a lift vertically movable thereon, a lever connected with the lift, and a clutch tted to and vertically movable upon the standard, said clutch being connected with the lever and forming, when engaging the standard, the fulcrum for the lever and support for the lift, substantially as described.

IOO

3. In a lifting-jack, the combination of a standard, a lift vertically movable thereon, a lever connected with the lift, and a clutchring plvoted to the lever and fitting over the standard, whereby it is adapted to cramp thereon and form afulcrnm for the lever and support for the lift, substantially as described.

4. In a lifting-jack, the -combination of a standard, a lift vertically movable thereon, a lever having an npturned inner end, a link connecting said end With the lift, and a clutchrlng pivoted to the uptnrned end of the lever and fitting over the standard, whereby it is adapted to cramp thereon and form a fnlcrnm for the lever and support for the lift, substantially as described.

5. In a lifting-jack, the combination of the standard, the lift having an eye or socket tted on the standard, and an extension with guide eye or socket tted on thelstandard be` low, whereby said lift is adapted to move vertically on the standard and is guided in its movement, the lever having forked npturned ends passing 011 each side of the standard, the links'conneeting said ends with the lift, and the clutch-ring pivoted in the upturned ends of the lever and fitting over the standard, whereby it is adapted to cramp thereon and form a fulcrnin for the lever and support for the lift, substantially as described.

6. In a lifting-jack, the combination of a standard, a liftvvertically movable thereon, a lever connected with the lift, a clutch-ring pivot-'ed to the lever and fitting over the standard, whereby it is adapted to cramp thereon and form a fulcrum for the lever and support for the lift, and the arm fixed to the clutchring` for relieving it from the standard, substantially as described.

7. In a lifting-jack, the standard having the notches or teeth, the lift tted to and vertically movable on the standard, the lever connected with the lift, the clutchrring pivoted to the lever and iitting over an d engaging the standard, as described, and the liXed pawl on the clutch-ring for engaging the notches or teeth of the standard, substantially as described.

8. In a lifting-jaclgthe standardhming the notches or teeth, the lift fitted to and vertically movable on the standard, the lever connected with the lift, the Yclntclrring pivoted to the lever and tting over and engaging the standard, as described, the pawl on the clutchring for engaging the notches or teeth of the standard, and the arm on the clutch-ring for relieving it, substantially as described.

9. A lifting-jack consistingof the combination of the notched standard, the sliding lift with guide-extensions fitted on said standard, the forked lever passing on each side of the standard, the links connecting said lever with IJthe lift, the clutch-ring pivoted to the lever and fitting over the standard, and the pawl and arm of said clutch-ring, substantially as described.

In Witness whereof I have hereunto set my hand.

JAMES P. HAYS.

\Vitnesses:

S. H. NoURsE, H. C. LEE.

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