US956478A - Lifting-jack. - Google Patents

Description

J. H, BURKHOLDER.

LIFTING JACK.

APPLIOATION FILED JULY 9, 190a PatentedApr.26,1910.

IFI'VENTOIRI AT TEST 8m 9 7@ BY fi mm j J acks,

jack, and Fig. 2 is a side JOHN H. nunmonnnn, or ASELAND, OHIO, nssrenon, TO THE ELITE MAZFUFACTUR-A v me'coinrnnr, or ASHLANI), OHIO, A CORPORATION.

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Specification of Letters Patent. Patqented Apr. 26, 1910. Application filed Jn1y 9, 1909. Serial no; 506,835.'

T 0 all whom it may concern: H

Be it known that '1, JOHN H. BURK- HOLDER," citizen of the United States, residing at Ashland 'in the county of Ashland and State of" dhio, have invented certain new and useful Improvements in Lifting of which the following ,is a specification.

My invention relates to liftingjacks, and

the invention consists in an improvement upon the construction described and claimed in Letters Patent issued to me May 12, 1908, No. 887,734.

In the accompanying drawings, Figure 1 is a vertical sectional elevation of the angles toFig. 1.

In the main, the two" constructions are substantially alike, but a material difference appears particularly in connection withtlie means for engaging the gears and holding the same as against a reverse movement of the handle or lever and also for holding the screw in the standard except when it is purposely lifted. .up or out, as will presently appear.

In detail, the parts comprise astandard A Y which has longitudinal channels or grooves '2 inside, and a screw B with a pin a through its lower end having its ends engaged in said grooves and serving to guide the screw on'straight lines vertically but preventing end rotation in the standard, as formerly. There are also two miter gears C and D, the gear C being internally threaded and mounted upon the screw B, and the said screw and gearadapted to be raised within the standard to any desired elevation or to be lifted bodily oif and out if desired. Or-

dinarily, in use, when the ,jack is brought to a vehicle to apply it to the axle, a quick' adjustment of the parts is made by lifting the screw with gear C bodilyup to about theelevation wanted and the gear is then run down and seated in operating position on the standard in mesh with the gear D. This aifords a quick and easy adjustment to an axle rather than awaiting the slow method of jacking up the screw by or through the lever H. Gear G rests directly upon the top ofthe standard, which serves as a bearing therefor, and the gear D is supported upon. a short spindle or shaft E,

shown as removably secured into the upper elevation at right other important function.

end of the standard and having the handle H rotatably mountedthereon outside of the pawl and ratchet teeth and the jack is .raised or lowered according as the pawl isset to work at one endor the other. As to these features, it need only'be said that they are acknowledged to be present in my patcut above referred .to,but a present description thereof is' deemed necessary in order that the associated novelty in this case may be understood.

, In the said patent means are provided for fri'ctionally locking the gears and holding them in any position to which they may be hold, as for example, when the jack is being raised. Then the handle is raised as far as may be convenient and depressed to do the lifting. However, if the jack be without a load, thetendency is for the gears to work too easy and they will run back with the deression of the'handle and no real progress is made in jacking up the screw. To prevent this result I employed a split ring or spring L in my said patent, which was mounted on shaft E and. bore against the hub of gear D and served the purpose of holding said gear 1 firmly enough to prevent backward rotation when the lever was making its idle or reverse stroke,-but I found that I could perform this function as well by an arrangement of spring which would enable it to perform still an To this end I have provided the jack with a substantially flat spring L which has its lower end affixed to the standard A at a on the opposite side from gear D and its'free end' projecting upward andreversely turned with something turned by the lever pending the moment when the lever is reversed to get another of a shoulder or tooth shaped projection 72 formed by bending the said spring rather sharply at said point and adapting the said bent portion 1) to bear against the hub of gear C with .sufiicient tension or pressure to frictionally hold the said gear. and prevent backward rotation when the handle is making its idle stroke in order to get a grip. This construction and arrangement of the spring serves identically the same purpose asthe spring L in the-patent aforesaid, but has the further advantage and value of holding the gearC u on the'standard A when other- Wise it woul fall out.

It has already been observed thatthe screw and gear 0 can be bodily withdrawn from the standard, and which was the case also in the above patent, but I have found that entire freedom in this respect is not desirable and that it were better to have a temporary connection so that ordinarily the parts will be held together, but can be separated at will.

.To this end, the hub of gear C is provided.

with an annular shoulder or groove 9 which produces a shoulder, and in or upon which the tooth like projection b of spring L engages. and serves to lock the said gear with the standard temporarily as against its being drawn OE, and a ard 9 con nes the spring in said groove.

4 or rather hook shaped extremityof thespring with the finger the parts may be readily disengaged when it is desired to withdraw the gear and screw. Thus the said spring performs two important functions by reason of ut by engaging the curve seas-7e this arrangement, and a material improvement of the jack is obtained. 1.

What I claim is: v In a lifting jack, a standard and alift screw mounted thereon and adaptedto be bodily raised in respect thereto, .a nut member for said screw adapted to rest upon said standard and to be lifted apart therefi'om for quick adjustment of the nut member upon said screw, means on said standard separably engaged with said nut member to cperate the same in a given direction, and a friction device for em nut member to prevent back rotation thereof upon idle move mentsof said operating means, said device and nut member having self-separable'engaging portions to permit-the screw to be lifted by one hand while adjustment of the nut member may be had by the other hand. In testimony whereof I aflixnly signature in presence of two witnesses.

JOHN H. BU'RmiOLDER.

Witnesses: Geo. A. Nicola,

J. H.'RAY.

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