US391692A - cebcelitjs - Google Patents

Description

v (No Model.)

L. J. CRECELIUS.

LIFTING JACK.

\\\' 'sented Oct. 28, 1888.

xls

LOUIS J. ORECELIUS, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF TO' ANDREW WARREN, OF SAME PLACE.

LIFTINGMJACK..

SPECIFICATION forming pari: of Letters Patent No. 391,692, dated October 23, 1888.

Application filed April 10, 1888. Serial No. 270,219. (No model.)

To all whom it may concern:

Be it known that I, Louis J. ORnoELIUs, of St. Louis, in the State of Missouri, have invented a new and useful Improvement in Lifting-Jacks; and I do hereby declare that the fol lowing is a full, clear, and exact description of the same.

My invention,hereinafter set forth,is animprovement in lifting-jacks of that class in which .ro a lifting-bar moving in a channeled standard is raised and held by grips in the head and standard. It is designed more particularly for use in connection with the tapering liftingbar shown in certain applications filed by ine in the Patent Office of the United States, having, respectively', the Serial Nos. 256,133 and 256,134; but the device is also applicable with good effect to other forms of lifting'bar.

The invention consists of an improved form 2o of gripping device for lifting the bar, or for holding it when lifted, and is applicable both to the standard and head.

As the gripping device is applicable to the general form of jack shown in my said applications,or to the forms generally known, I do not deem it necessary to particularly describe the jack in all its parts, but only those more immediately connected with lmy improve ments.

The accompanying drawings show, in Figure l, a central vertical section through the jack. Fig. 2 is a horizontal section on line :c x of Fig. l. Fig. 3 is a detail view of a modiV fication. Fig. 4 is a View of one ofthe gripping parts in section.

In the drawings, A represents the standard channeled to receive the lifting-bar B. The head C is raised by a lever pivoted on the standard and lifting the head in the ordinary 4o manner. The lifting-bar is preferably tapered from the upper end downward and moves in a groove or channel. The taper is shown on the lines a b,- but this groove or channel or tapered face of the bar may be in any form of cross-section. In one side of the standard is a chamber or recess opening into the channel, and in this chamber or recess is pivoted a wheel, D. The wheel is pivoted on a strong Steel pin, d,which has its bearings in the walls ofthe chamber. Between the face ofthe wheel 5o andthe face of the bar is a wedge-shaped block,

F, one face of which bears directly against the bar and the other against the periphery of the wheel. Theamount oft-aper,both of the wedge block and of the bar, may be varied; but they must be proportioned to each other so that the block shall bear with a gripping effect upon the bar in whatever vertical position the bar may be. The lower or thinner part of the block will be between the wheeland the thicker 6o part of the bar when said bar is lowered, and

as the bar rises the block will fall, always exercising its wedging effect upon the bar and gripping it, and thus holding it to the standard or to the head, as the case may be. The wheel turns with the rising or falling of the block; but the face of the block bears upon the bar with frictional contact, and slips thereon only when the bar is raised, which loosens the block and allows it to drop by 7o gravity to fill the space between the bar and wheel. The upper part of the block innst therefore be between the bar and wheel when the bar is raised to bring its thinnest end opposite the wheel, and the eXtreme upper end of the block must exceed in thickness the distance between the lower end of the bar and the face of the wheel, to prevent the block dropping through and to give a certain grip under all circumstances. In other words, the So amount of taper on the block exceeds that of the bar.

The faces of wheel and block which are in contact may be plain; but in order to keep them in certain unison I prefer to forni them with teeth which are constantly in mesh with each other. The special forms of the cogged faces are shown in Figs. l and 3. It is better that the bearing-faces which are under great pressure should be plain, and for this purpose 9o I make the teeth upon one-the wheel, for eX- ainple-in the form of a sunken peripheral rack, f, in the center of the face of the wheel, and a rack, g, with raised teeth, fitted to that on the wheel on the central longitudinal line of the block. On either side of these racks is a plain surface, and the teeth are so fitted to each other that the plain surfaces will bear upon each other when the racks are in engagenient, the teeth serving only to hold the parts in unison. The sunken teeth may, so far as the operation is concerned, be on either block or Wheel.

A lifting-lever, f2, carrying a pin, g', is provided on the standard, the pin entering a hole in the bottom of the chamber, so as to lift the block when the lever is depressed. rIhis lever may be operated by the foot or hand Whenever it is desired to raise the block to release the bar, as in lowering.

The head is provided With4 the Wedgingblock F and Wheel D, and a spring-pin, 2, above the block, of the same construction as described for the standard; but the lifting-lever and pin are not required for the head, but only a pin, g, set in the standard and projecting into the chamber in the head when the head is down on the standard to lift the under block out of engagement. As the head is lifted, or as the bar is drawn down by the load, the block Wedges between the bar and the Wheel and forms a secure grip. The teeth or frictional contact hold the block in proper relation to the Wheel, and as the bar rises the block and wheel, acting in unison, occupy the increased space caused by the taper on the bar and compensate for the taper. The 10W- ering is performed in the manner above indicated by releasing the lower grip and Working the lever to release the upper grip in the head.

The Wedge may be formed upon the Wheel instead of the block, as is shown in Fig. 3, and with the same effect. In this form the block F may be of uniform thickness. It has a plain face bearing upon the tapered bar and the same kind of a plain or toothed face as the block F. The Wheel D is vin this case eccentric on its pivoting-bolt, and the Wedging ac tion is given by the eccentric or curved Wedge on the Wheel. In both forms there is a wheel and block with a Wedging-face, and there is a combined gripping action arising from the Wedging of the block and Wheels and the taper of the bar.

The Working parts may be made of hardened cast-steel and are all removable, so that they may be replaced when Worn; but the Wear is distributed over the Workingsurfaces and is slight.

In connection with the tapering bar this form of grip gives a Wedging action on both sides of the block-that is to say, on the plain side of the block in the wedging action of the bar, the inclined face of which bears on the block, and as the other sideof the block is its own taper or that of the Wheel, so that neither can slip.

The operating-lever A' is shown in dotted lines in Fig. l, and consists of a socket pivoted to the upper end of the standard With links, as at a', connecting short arms a2 of the lever, which pass to either side of the standard, With the lifting-head C, so that the lifting movement is obtained by the depression of the lever. Only one link and one arm,a",is shown in the drawings, being represented in dotted lines.

I claim as my inventionl. In combination with the lifting-bar B of a jack and a lifting head,O, and lever, awedging-Wheel and block, said Wheel being journaled in bearings to have rotary movement, and the block being arranged between said journaled Wheel and the face of the lifting-bar, substantially as described.

2. In combination With the lifting-har of a jack anda suitable head and liftinglevcr, a Wedging gear-Wheel and block having plain and toothed surfaces in contact, said block heing arranged to bear on the face of the bar, all substantially as described.

3. In combination with the lifting-bar of a jack, a suitable lifting-head and lever therefor, a wedging-Wheel journaled in fixed bearings to have rotary, movement, and a block arranged in the chamber of thestandard, said block having a smooth bearing-face in contact With the face ofthe lifting-bar and a rear face in positive connection with the wedging- Wheel. substantially as described.

4. In combination with a tapering liftingbar ofajack, a lifting-head and lever there` for, and a wedging gear-wheel and block arranged in the chamber of the standard, the block bearing upon the face of the bar,all substantially as described.

In testimony whereof I have signed my naine to this specification in the presence of two subscribing Witnesses.

LOUIS J. OREGELIUS.

Witnesses:

C. D. GREENE, Jr., GHAs. A. THoMPsoN.

IOO

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