US598660A - Lifting-jack - Google Patents

Description

NHED STATES PATENT OFFICE.

EUGENE HAYFORD AND ARTHUR G. HAYFORD, OF SPOKANE, WASHINGTON.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 598,660, dated February 8, 1898.

' Application filed December 7, 1896. Serial No. 614,676. (No model.)

The object of our present invention is to provide a stronger and more effective and reliable jack which will stand rougher usage; and the improvement consists in certain constructions and combinations of parts hereinafter particularly described.

In the accompanying drawings, which illustrate our improved jack, Figure 1 is a perspective View thereof with the extension-handle detached; Fig. 2, a perspective view of the cap-plate, the operating-lever, and parts connected therewith; Fig. 3, a perspective View of the lower end of the lifting-bar, and Fig.

at a plan View of the catch-plate and flatchlever on an enlarged scale.

A standard A is secured to a base B, made of sheet metal, with an angular upturned end flange B upon the lever side of the standard and with a slotted or bifurcated flange B folded over and curved upwardly against the face or lifting side of the said standard and with bolts b passing through the flanges B B of the base and also through the lower end of the standard A, thus providing a light strong wrought-metal base, with a forward extension B of sufficient length to provide a secure support for the jack-standard.

The lifting side of the standard A has a longitudinal recess to receive a lifting-bar 0, adapted to move longitudinally therein and provided with longitudinal side grooves c therein to'receive plates 0 bolted to the face of the lifting side of the standard A to project within the grooves a therein and hold the bar 0 truly and securely in an upright position upon the standard to freely move thereon, a cap 0 fitted upon the upper end, and a lifting-toe c forged upon the lower end of said lifting-bar, providing suitable means for connecting the lif tin g-bar to the load, whether the latter be in a raised or in a depressed position.

The plates 0 provide a secure connection and perfect freedom of movement of the bar 0 upon the standard, and the said bar is additionally secured thereto by a cap-plate D, fitted upon the top'of the standard and turned down at a right angle D to fit against the lifting-face of the standard and be secured thereto by bolts 61 at each side, which latter pass transversely through the upper end of the standard and also through a back plate E,

flanged at its upper end to overliea portion of the cap-plate D and slotted vertically to receive the lifting-lever F, which latter is pivotally supported in the recessed upper end of the standard.

The cap-plate D has a rectangular recess at its upper end to receive the lifting-bar O, and

with inwardly-projecting spurs d thereon which fit into the side grooves c of the bar a C and thus securely hold and guide the upper end of said bar 0 to insure its freedom of movement therein. The bar 0 is also held at the lifting-face of the standard A, near the upper end thereof, by a metal strap I-I, secured at the sides of the standard by a through-bolt h and at the lifting-face thereof by bolts h at each side thereof, which pass transversely through the standard and also through the lower end of the back plate E, and thus securely hold the several parts to the upper end of the standard;

Lifting-handle rings I, at each side of the standards below the strap H, are secured theretoby bolts i, which pass transversely through the standards and through the said per ends between the lugs cl d and K to provide a strong swinging fulcrum for the lifting-lever.

The contact-point of the lifting-lever F comprises a series of teeth f f f which interlock with the ratchet-teeth c of said liftingbar and provide a rolling contact therewith which may be easily swung into and out of gear to engage and disengage the teeth one with the other when the lifting-lever is vibrated and also swung upon its hanging fulcrum, a number of said teeth being required for car-lifters and similar heavy work. The

ratchet-teeth at the upper end of the liftingbar are engaged by a vibrating bell-crank catch-lever L, pivoted at its angle Z to the capplate D and connected near its inner end fixedly to the end of a straight wire springm, the said spring being passed freely through lugs M on the short end of a lever M, pivoted at m to the cap-plate D of the standard. The back plate E, which overlies a portion of the capplate D and is fastened thereto by rivets m has at its one side an upturned flange m over which the free end of lever M moves, the lever being provided at its free end with an upturned handle or stem m and engages with notches m and m of the flange m of the plate E, which hold said lever in one or the other of its working positions. The lever M,through the-spring m, acts quickly upon the catch-lever L to throw it into or out of engagement.

.presents itself by the upward movement of the lifting-bar. When the lever M is held in the notch m, the spring-actuated lever L is normally held out of engagement with the ratchetteeth of the lifting-bar, and when the said lever is placed in the notch m it is nordo the heaviest class of work upon which a hand-jack may be used. The lifting-lever F may be made longer by an extension-bar F, having a tubular socket to fit completely around'the end of said lever.

We claim as our invention and desire to secure by Letters Patent 1. In a lifting-jack, the combination with the standard, the cap-plate having depending lugs, swinging hangers pivoted thereto, the lifting-lever, the notched lifting-bar, the angular catch-lever, an adjustable lever and a spring connecting said lever with the catchlever, substantially as described.

2. In a lifting-jack, the combination with the standard and cap-plate, the notched lifting-bar, means for adjusting the same, an angular catch-lever pivoted to the cap-plate to engage with the notches of the lifting-bar and having a spring-rod connected thereto, near its pivotal point and a lever pivoted to the cap-plate provided with openings at one end to receive the free end of said spring-rod and adjustably secured at the other end to the cap-plate, substantially as described.

In testimony that we claim the foregoing as our invention we have signed our names in the presence of two subscribing witnesses.

EUGENE HAYFORD. ARTHUR G. IIAYFORD.

Witnesses:

.I. H. McBRooM, R. L. EDMISTON.

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