US558581A - Lifting-jack - Google Patents

Description

E. COVERT.

LIFTING JACK.

(No Model.)

No. 558581. Patented Apr. 21, 1896.

ENOCII COVERT, OF FARMER, NE`W YORK.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 558,581, datecl April 21, 1896. A li ati fil d November 9, 1895. Serial No. 568,&66. (No model.)

To all whom 't may concern:

Be it known that I, ENOOH COVERT, a citizen of the United States, residing at Farner, in the county of Seneca and State of New York, have invented certain new and useful Improvenents in Lifting-Jacks, of which the following is a specification, reference being had therein to the accompanying drawings.

The object of my invention is to provide a light, strong, cheaply-constructed, and easilyoperated lifting-jack of few parts and to this end ny invention consists in the lifting-jack having the Construction hereinafter specified.

In the drawings, Figure 1 is a vertical sectional view; Fig. 2, a similar view of the base portion, somewhat enlarged; and Fig. 3, a detail perspective of the lower end of the fulcruni-rod.

Referring to the drawings by letters, A designates the base of the jack, which for the sake of lightness is in the form of a ring cast with a suitable number of upwardly and inwardly curved arms a, that are integral with and support a short tubular socket B in a position eccentric to the ring A. Secured at its lower end within the socket B, by being made to fit the same so tightly as to require to be forced therein, is a tubular standard or upright O, preferably round in cross section, into the upper portion of which projects the shank or bar D of the axle engaging and supporting block E, said shank and standard serving to guide the latter in its vertical movements. The block E is shown as provided with several integral rigid steps or shoulders or points of support eand with a separatelymade one in the form of an L-shaped bar F, that is Suspended from the lowest of the steps e.

Pivotally connected at 6 to the block E is the end of an Operating-lever G, whose fulcrun is forned by a bar H, to the upper end of which it is pivoted, and which in turn is pvoted at its lower end to one of the arms a of the base A, said arin a being provided with an integral book-like lug` a', thatengagcs an eye in the lower end of the bar.

The pivot e' is substantially in a line vertically with the pivot-hook a', and the length of the fulcrun-bar H is such that When the block E is at its lowest position the point of pivotal connection between the lever G and said bar will be a little above a line passing horizontally through the pivot e'. By de- 'pressing the outer or free end ot' the lever G the block E will be raised, and as soon as the pivot e reaehes and passes a point horizontally in line with the connection between the lever and the fulcrum-bar II the latter will be swung inward until it occupies a vertical position with the three pivotal points in a straight line and, in consequence, the block E locked in its raised position. t

It Will be observed that the block E is sustained from the base A entirely-by the lever G and the fulcrun-bar H, no Weight Whatever being borne by the standard C. The described connection between the latter and the socket B is accordingly adequate for all strains that may come upon it.

That the weight upon the block E may not fall upon the pivot-hook cd the eye of the bar H is made sufficiently large to pernit the lower end of the bar to rest upon and be supported by the arin a directly beneath the lug. The hook a', it will be apparent, is a cheaper pivotal connection .than apin or rivet, as all drilling and rivetin g are avoided.

It will be seen that the hook a is fermed on the base outside of the bearing-point of the rod II and extends inward through the eye therein to near the standard, whereby it will be inpossible to remove the fulcruni-rod II without first removing the standard. The fulcrum-rod is confined under the hook by simply securing the standard in its socket.

Forned 011 the lower end of the fulcrunrod H, under the hook a', is a lug f, which extends inwardly and touches the standard, this lug serving to keep the pivotal point of the fulcrum-rod pressed outward under the hook and away fron the standard.

To lock the tubular standard in the ringsocket B, the said socket is provided with an annular groove g on its interior near its lower end, and the extreme lower end of the tubular standard is forced outward into said groove by reanin g or otherwise, whereby the standard will be permanently and cheaply fastened in place and will not be liable to detachment by rough handling.

Having thus fullydeseribed my nvention, what I claim is and otherwise more advantageous form of IOO '1. In a lifting-jack, the combination of a base and a standard risingtherefrom, ahook carred by said base at one side of the standard and extending upward and inward to near the standard, an axle-engaging part Working on the standard, a' lever, and a fulcrum-rod, the lower end of the fulcrun-rod having an opening for-med in it at its lower end, through which the hook extends, said fulcrun-rod being confined in the hook by the standard and having its pivotal hearing on the base under the hook, substantially as described.

2. In a lifting-jack, the combination of a base, a standard rising therefrom, said base having formed on it at one side of the standard a book-like part a' extending nward toward the standard, a fulcrun-rod having an eye formed n its lower end through which the hook portion a' extends, and which has its pivotal point on the base under the hook, said fulcrum-rod having forned on it under the hook an inwardly-extendng lug terminating at or near the standard and serving to keep the fulcrum-rod away from the standard and out under the hook, and an aXIe-engaging part and a iever, substantiaily as described.

In testinony Whereof I affix my signature in presence of two witnesses.

ENOCII COVERT. itnessesz FRED L. RAPPLEYE,. O. G. WHEELER.

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