US375675A - Lifting-jack - Google Patents

Description

(No Model.)

B. HUBER.

LIFTING JACK.

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UNITED STATES PATENT OFFICEQ EDlVARD HUBER, OF MARION, OHIO LIFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 375,675, dated December 2'7, 1887.

Application filed September 23, 1887. Serial No. 250,500.

To aZZ whom it may concern.-

Be it known that I, EDWARD HUBER, of Marion, in the county of Marion and State of Ohio, have invented certain new and useful Improvements in Lifting-Jacks; and I do hereby declarethe following to be afull, clear,

and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in lifting-jacks.

The object of my present invention is to improve the construction of the lifting-jack for which Letters Patent of the United States No. 362,085 were granted to me, and dated May 3, 1887.

The nature of my presentinvention consists, essentially, in the location ofa ratchet-toothed lifting-bar between the parallel walls of avertical supportirig-standard, and so constructing and arranging a forked pivoted lever with two swinging detent-loops that the elevation of the lifting-bar, locking of the bar, and its re lease by the operator may be more readily effected than in the device of which this is an additional improvement.

lVith this object in view my invention con sists in certain features of construction and combinations of parts, that will be hereinafter described, and pointed out in the claim.

Referring to the drawings, Figure 1 is aside elevation of the lifting-jack. Fig. 2 is a front view in elevation of the jack. Fig. 3 is a plan view of the device.

A represents a standard, which consists of two parallel sides that are vertical projections from a base, A. The upper portion of the standard A, from the top edge, e, to the point e, is constructed with four walls, (see Fig. 8,) that producea box rectangular in ci'osssection. A lifting-bar, B, is made to slide in the upper boxed portion of the standard A and between its side walls. This bar is of such relative length totheheight ofthestandardfromits base that a portion of its body will projecta short distance above the edge e of said standard.

Upon the side surface of the boxed upper portion of the standard A a boss, I), is formed, which is transversely perforated to receive a pivot-bolt, b, that gives support to the lever C,which latter is forked and has the parallel limbs G of its forked end spread apart suffi- (No model.)

ciently to straddle the standard A when the lever is pivotally attached to the boss I) by its pivot-bolt b, whereupon it is intended to vibrate vertically. Each end 0 of the forked lever C is bifurcated to receive and give support to the upper ends of the loop E, which are enlarged edgewise to form rounded terminations E, (see Fig. 3,) these limbs being perforated in axial line with each other, so that the loop E will have a free swinging connection with the outer ends of the forked lever 0 when pivoted thereto.

- The projectingedge of thelifliug-barB,that is located below the pivot-bolt b of the lever O, is provided with ratchet-teeth a, that slope downwardly. Thejoining crossbar f of the loop E is properly beveled on its upper edge to engage and lock with the square shoulders of the teeth a. It is evident that an upward movement of the lever C will lower the loop E and allow its crossbar f to engage a lower tooth on the lifting-bar B, a reverse move ment of the lever raising the bar.

At a proper point below the pendentliftingloop E the detent-loop D is pivoted by its ends at d to the sides of the standard A, this loop being of such a length that its crossbarg will latch into a tooth of the ratchetrack a and hold in locked adjustment the bar B when it is elevated by the vibration of the lever O, as has been explained.

Thelifting-loop Eand detent-loop D are each provided with projecting cars h t, that afford a convenient abutment for the fingers of the operator to engage with when the loops are disengaged from contact with the ratchet-teeth of the lifting-bar B, this release of the loops being necessary when the jack is lowered.

Near the lower end of the lifting-bar B a projecting lug, B, is extended at a right angle to its body on the side of the bar thatis opposite the ratchet-teeth formed on it. This lug is provided to affordameans forlifting abody that is located near the base of the jack. The head or top end of the bar 13 may also be used in the usual manner when the point of contact is above the range of the lug B.

When any weighty body has been elevated to the desired height and removal or lowering of the lifting-bar B be desired, this may be accomplished by first slightly depressing the lever 0, which will release the detent-loop D, and

the upward movement of the lever C will lower the barB. Should the elevation of the barB be considerable when it is employed to lower a weighty body, it may be necessary to release the lifting-loop E and elevate it by a depression of the lever G, the detentdoop D having been locked with the bar to permit such a change of position of the lever O. A repetition of the lowering operation may now be effected and the lifting-bar lowered with a load upon it to any point from a plane above.

It will be apparent from the description of this improved device and its manipulation when in use that it is very important for a proper and convenient operation of the working parts that the toothed rack a should be located upon the same side of the jack upon which the lever 0 projects, and that to avoid interference with free action and render the implement efficient in use the lug B should project from the side of the bar 13 that is opposite to the toothed face a of this bar.

Having fully described myinvention,whatl claim as new, and desire to secure by Letters Patent, is

The combination, with a base, the standard having parallel walls and boxed upper end, and a forked lever pivoted to the standard with its limbs on each side of the boxed portion thereof, of a lifting-bar adapted to slidein the standard and provided with a lifting-toe on one side and ratchet-teeth on the other, the ratchetteeth being on the side of the bar adjacent to the lever, a liftingloop pivoted to the limbs of the lever and a detent-loop pivoted to the sides of the standard, both loops engaging the ratchetteetli of the lifting-bar to elevate, lower, or hold it in any desired position, substantially as set forth.

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

El)\VARD HUBER. lVitnesses:

J. E. Davrns, IRA UrrLna.

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