US668716A - Lifting-jack. - Google Patents

Description

No. scisma. Patented ren. 26, |9ol.

J F. NORMAN.

LIFTms JACK. (Applicmcn medNov. 1o, 1900.)

(nu Mdel.)

We gill/[lll Nannls Patins co.. Pumaumo.. WASHINGTON n c NTTED STATES PATENT OFFICE.

v JOHN F. NORMAN, OF KNOXVILLE, ARKANSAS.

LIFTiNG-JACK.

sPEcIricArIoN forming part of Letters Patent No. 668,716, dated February 26, 190i.

Application led November 10, 1900. Serial No. 361,083. (No model.)

To all whom it may concern.-

Beit known that I, JOHN F. NORMAN, a citizen of the United States, residing at Knoxville, in the county of Johnson and State of Arkansas, have invented a newand useful Lifting-Jack,of which the following is a specification.

This invention relates to lifting-jacks, and has for its object to provide an improved vertically-adjustable lifting-head, so as to conveniently accommodate the jack to the work in hand. It is furthermore designed to provide improved means for locking the operating-lever, so as to prevent the weight of the object lifted from forcing the lever upwardly, and thereby dropping said object.

With these and other objects in view the present invention consists in the combination and arrangement of parts, as will be hereinafter more fully described, shown in the accompanying drawings,and particularlyr pointed out in the appended claims, it being understood that changes in the form, proportion, size, and minor details maybe madeA within the scope ofthe claims Without departing from the spirit or sacricing any of the advantages of the invention.

In the drawings, Figure l is a perspective View of a lifting-jack constructed in accordance with the present invention. Fig. 2 is a transverse longitudinal sectional view thereof. Fig. 3 is a detail sectional elevation showing a pair of jacks employed in lifting a wagon-bed from the running-gear thereof.

Like characters of reference designate corresponding parts in all of the figures of the drawings.

Referring t the drawings, it will be seen that the standard of the present jack is formed by two spaced uprights l and 2, which rise from a base 3 and are braced and held apart by means of the top and bottom spacingblocks 5 and 6, respectively, the latter also being secured to the base. These standardsections are provided with a vertical series of corresponding openings or perforations 7, which open through the respective vertical grooves 8a, formed in the inner faces of the uprights or standard-sections.

The operating-lever 8, which is received in the longitudinal slot formed by the spaced standard-sections, projects in opposite directions therefrom and -is provided with an iritermediate transverse 'perforation 9 for the reception of a removable yfulcrum pin 10, which also passes through a pair of correspending openings in the standard, whereby the lever is mounted upon the standard and is also adjustable vertically thereon. It is preferable to have the removable fulcrumpin connected to the standard by means of a chain or other flexible connection 1l, so as to prevent loss of the pin. The lifting end portion of the lever is comparatively short, and straddling the saine is a vertically-adj ustable lifting-head 12, which is provided with a longitudinal slot for the reception of the lever and has its opposite sides provided with a plurality of corresponding perforations 13 for the reception of a removable pin 14, which also passes through a perforation in the adjacent end of the lever, so as to connect the head to the lever and also to provide for the vertical adj ustment thereof. By this arrangement the jack may be applied to lift an object which otherwise the lever could not reach on account of the height of said object.

To lock the lever against motion when the operator removes the pressure therefrom, there are provided the opposite duplicate links 15, preferably in the form of a substantially U -shaped link,which has its intermediate portion pi votally connected to-the outer portion of the lever, preferably by being passed loosely through a transverse opening in the lever, as indicated at 16. rlhe inner free end of each link is bent laterally outward to form the hooks 17, which are designed to take into corresponding perforations of the standard-sections and from the inner sides thereof, as shown in Fig. 2 of the drawings.

From the foregoing description it is apparent that the links are sprung out of engagement with the standard when it is desired to operate the lever and afterward swung inwardly and sprung into engagement with corresponding perforations of the standard, so as to lock the lever against movement. The grooves form guides, whereby the hooked ends of the links may be conveniently directed to the perforations, and they also form Iianges against which the hooks may engage at points between adjacent perforations, so as to secure additional adj ustments than those IOO aiforded by the perforations. Ordinarily the l ing-links pivotally carried by the lever, and

hooks may be engaged with the perforations; but should the hooks come between adjacent perforations they will engage against the inner sides of the respective flanges formed by the grooves and by reason of frictional engagement therewith will hold the outer free end of the lever from being thrown upwardly.

In Fig. 3 has been illustrated the application of the present form of jack to an object which the lever could not otherwise reach and shows a pair of jacks applied to the body of a vehicle, the lifting-heads being adjusted so that their upper ends may bear against some part of the body-as, for instance, the opposite step-boards-thereof. In other applications of the jacks the tops of the heads may be connected bya beam, or a beam may have its opposite ends received within the slots of the heads and rest upon the bottoms thereof.

It will be observed that the slot of the lifting-head terminates short of opposite ends thereof, so that both ends of the head are solid, and as the head may be inverted the unused end thereof may be brought into use when the opposite end has become worn or broken.

What is claimed isl. A lifting-jack, comprising a verticallyslotted standard, a lever fulcrumed within the slotted portion thereof, and opposite locking-links pivotally carried by the lever, and having their free ends normally in locked engagement with the opposite inner sides of the slotted portion of the standard.

2. A lifting-jack, comprising a verticallyslotted standard, a lever fulcrumed within the slotted portion thereof, opposite inwardlydirected longitudinal flanges upon the opposite sides of the slot, and opposite lockinglinks pivotally carried by the lever, and having their free ends provided with lateral oppositelydirect-ed hooks normally received within the slot and in frictional locked engagement with the respective flanges.

3. A lifting-jack, comprising a longitudinally-slotted standard, having corresponding perforations, a lever fulcrumed intermediate of its ends within the slot, and a pair of lockhaving their free ends normally received within the slot of the standard, and also provided with oppositely-directed hooked terminals for adjustable engagement with the corresponding perforations.

4. A lifting-jack, comprising a longitudinally-slotted standard, having corresponding longitudinal grooves formed in the inner sides of the slot, and also provided with corresponding perforations opening through the respective grooves, a lever fulcrumed intermediate of its ends within the slot of the standard, and opposite swinging links carried by the lever, and having their free ends received within the slotted portion of the standard, and also provided with oppositely-disposed hooked terminals for adjustable engagement with the corresponding perforations.

5. A lifting-jack, comprising a longitudinally-slotted standard, provided with corresponding perforations, a lever projecting in opposite directions th rough the slotted portion of the standard, and provided with a transverse opening, a removable fulcrum pin passed through the opening in the lever and also through corresponding perfor-ations in the standard, and opposite swinging links carried by the lever, the free ends thereof being received within the slotted portion of the standard, and also having terminal hooks for adjustable engagement with the corresponding perforations of the standard.

6. A lifting-jack, comprising a standard, a lever fulcru med intermediate of its ends upon the standard, and an invertible longitudinally-slotted lifting-head straddling the lifting end of the lever and provided with corresponding transverse perforations, and a removable pin passed through a pair of corresponding openings in the head and also through the adjacent end of the lever.

In testimony that' I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

JOHN F. NORMAN.

Witnesses:

D. N. CLARK, CLAUDE MOORE.

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