US900200A - Lifting-jack. - Google Patents

Description

' J. A. PHILLIPS.

LHTING JACK. APPLICATION FILED HAY 21, 1908.

Patented Oct. 6, 1908.

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damp/265406 jack of this character which may be chea Jornv A. PHILLIPS, 0F BLOOMFIEVLI), INDIANA.

unwind-JAC Specification of Letters Patent.

Patented Oct. 6, 1908.

Application filed May 21, 1908. Serial No. 434,124.

.To all whom it may concern." 1

Be it known that 1,.JOHN A. PHILLIPS, citi zen of the United States, residing at Bloomfield, in the county of Greene and Stateof Indiana, have invented certain new and use ful 1m rovements in Lifting-Jacks, of which the to owing is a specification.

This invention comprehends certain new and useful improvements liftin jacks, of the class known as lever bar, and c utch loop that embody a bar or standard anda pair of runners one of which is. arranged to clutch the standard .while the other is being raised, so as to effect .an intermittent climbing movement upon the standard, and the presentinvention has for its primary object, a simple, durable and efficient construction of lifting 1y manufactured and easily assembled and disassembled, those parts of the jack upon which the strain or wear is not mainly 1mposed, being formedpreferably of .cast iron or the like, while those parts upon which the strain vcomes are composed of steel, thereby.

enabling axs-trong structure to be produced at a relatively low cost; and another object of this invention is an improved construction of deviceof thischaracter which will be 0si-' tive and sure in its action and not ,liab e in any degree to accidentally lower the load that is being raised.

With these and other objects in view, as will more fully appear as the description proceeds, the inventionlconsists in certain constructions, arran ements and combinations of .the parts that shall hereinafterfully describe and claim.

For :a full understanding of the invention, referenceis tobe had to the following description and accompanying drawings :in which:

; Figure 1 isa side elevation of a liftingjack embodying the improvementsrof my invention; the lowerrunner being shown in section. Fig. 2 is an enlarged sectional view of a ortion of the jack, the. section being ta on through the ,upper runner; Fig. 3 is ,.-.a horizontalsection on the line 33 of Fig-.2. Fig. 4 is a detail sectional view through the [lower runner, on :anzenlargedl-scale; Fig. 5 is a detail-perspective view of the locking dog of the upper runner and-Fig. 6 is a detail sectional view onthe linenoot 1. v .1

Corresponding and like parts are r fe r to he following description :andindieated 8 designates the lower runner.

in all the views of the drawings by the same reference characters.

Referring to the drawings, the numeral 1 designates the standard of my improved lifting jack which is referably constructed of stee channeled on both sides and which may be secured at its lower end to the foot or base 2 .of any desired construction. Preferably the standard 1 is secured at its upper end to a lifting handle 3 by which the device may be carried from place to place, said handle embodying a wire clam 4 and being formed with a vise jaw 5, sai vise jaw being designed to coact with a corresponding vise jaw 6, on the upv er runner 7 of the jack, and the wire clampl4 eing designed to coact with a wire clam 4 on the said u per runner. By means 0" these accessories, t e jack may be used as a wire stretcher or as a vise in addition to its primary function as a lifting or hoisting apparatus.

The said lower runner 8 is mounted to move longitudinally on the standard 1 and is formed in its rear side with a recess 9in which a toothed block 10 is rigidly connected, as by a rivet or the like, said toothed block being preferably formed of tool steel in .contradistlnction to the cast material of which the runner itself is formed and the teeth of the block being designed to engage thejteeth 1 1 formed in the rear edge of the standard 1, as clearly illustrated in the drawings.

The lower runner. 8 is hollow in its front I side and is formed with a depending nip le 12 designed to hold in place the up or end? of a coil expansion spring 13. The ower end of thespring 13 fits around a corresponding nipple 14 formed on the lower extremity or arm 15 of an Lshaped pitman fuloru-med at its elbow in the forward hollow portion of the lower runner8 as indicated at 17. v The; itman 13-6 projects upwardly into the hol ow front portion of the upper runner 7 and is connected to a wrist in 18 formed on .the operating lever 19, sa d lever being angular as shown and being fulcrumed at one end ,on the upper runner 7 as indicatedat 20.

2 1 designates the preferably Wooden handle portion of the operating lever.

22 designates the bearing surface of the upper runner upon which the load is placed, the rear side ofsaid bearing surface preferably-terminating in an upwardly rojecting spur 23;;which may be bent slight y inward whenever necessary to take up any wear so as to properly bear against the front edge of the standard and which also serves as a rear abutment for the vehicle axle or other load imposed upon the bearing surface 22, to prevent the same from engagement with the standard.

The upper runner 7 is formed in its rear side with a cavity 24 in which the referably steel block 25 is received, said b ock being secured in place by transverse rivets or similar fastening means. The block 25 is formed with a chamber 26 which faces forwardly as shown and which is designed to accommodate the locking dog 27 of the upper runner said dog being formed with a toothed upper end 28 designed to engage the teeth 11 of the standard. The dog 27 is supported at its lower end in a socket formed for it by the upwardl projecting lower extremity 29 of the bloc 25. A preferably steel spring 30 which is of \I-shape, in the present instance, with its two leaves or members integrally connected together, is received in the chamber 26 back of the dog 27 and exerts a tension to press the dog forwardly into engagement with the teeth of the standard 1.

In'order to hold the dog 27 retracted in the chamber 26 out of engagement with the teeth 11, the said dog is formed in its front face with a recess 31. A cross bar 32 fits in said recess and extends outwardly through laterally elongated slots 33 formed in the said walls of the runner. The bifurcated re leasing lever 34 has its two arms fulcrumed at their forward extremities on the ends of said cross-pin 32. The lever 34 is formed with an apertured finger piece 35 by which it may be pressed downwardly so as to ride with a cam action on the outer rear inclined wall of the upper runner 7 dog 27 backwardl the said lever finally finding lodgment in the groove 36 formed in the rear wall of the runner so as to lock the lever in its released position, with the dog fully retracted.

37 designates a steel piece which is riveted or otherwise fastened in the runner 7 below the block 25 in engagement with the lower end of the block, so as to assist in supporting the same.

In the practical operation of my improved lifting jack, it is evident from the foregoing description in connection with the accompanying drawing that by imparting a vertically oscillating movement to the actuating lever 19, the runners will alternately grip the standard, first one and then the other being raised so as to impart an upward movement to the load. In order to slide the runners downwardly upon the standard, it is only necessary to swing the releasing lever 34 downwardly so as to retract the dog in the chamber 26 and to then raise the operating lever 19 so as to lower the upper runner until so as to spring the its lower end comes in contact with the lug 8 projecting upwardly from the rear side of the lower runner 8 whereupon the lower runner 8 will be caused to rock rearwardly so as to cause its toothed block 10 to move out of engagement with the teeth 1.1 of the standard and both runners may then be slid freely down the standard.

As best seen in Fig. 6 the 0 )erating lever 19 is formed with a hollow cylindrical trunnion 19 which fits within a bearing opening in the runner as indicated at 20. A screw 20 works into the threaded bore 20 of the trunnion, a washer being interposed between the head of the screw and one side of the run ner, the purpose of said screw and washer being to hold the operating lever securely in place, and to take up by its tension the wear.

Having thus described the invention, what is claimed as new is:

1. A lifting jack comprising a standard, upper and lower runners mounted. to slide on said standard, an operating lever fulcrumed. on the upper runner and having a pitman connection with the lower runner, means carried by the lower runner for gripping the standard, the upper runner being formed With a cavity, a block rigidly secured in said cavity, and formed with a chamber, and an outwardly spring pressed dog mounted in said'chamber and arranged to engage the standard.

2. A lifting jack, comprising a standard, upper and lower runners mounted to slide on said standard, the lower runner being arranged to grip the standard, an operating lever fulcrumed on the upper runner and having a pitman connection with the lower runner, the upper runner being formed with a cavity, a block rigidly secured in said cavity and formed with a forwardly facing chamber and an upwardly facing socket in the lower end of the chamber, andan outwardly spring pressed dog mounted in said. chamber and supported with its lower end. in said socket and arranged for engagement with said runner.

3. A lifting jack, comprising a standard, upper and lower runners mounted. to slide on said standard, the lower runner being ar ranged to clutch the standard, an operating lever fulcrumed on the upper runner and having a pitman connection with the lower runner, a dog mounted in the upper runner and spring pressed into engagement with the standard, a cross-pin interposed between a portion of the dog and the adjacent edge of the standard, the upper runner being formed with laterally elongated slots, accommodating the ends of said pin and the runner being further formed with an inclined outer wall, and a releasing lever forked to embrace the runner and pivotally connected. to the ends of said pin and arranged to ride upon the inclined wall of the runner whereby to draw the dog backwardly against its spring tensioning means. i

4. A lifting jack, comprising a standard, upper and lower runners mounted to slide on said standard, the lower runner being arranged to clutch the standard, an operating lever. fulcrumed on the upper runner and having a pitman connection with the lower runner, a dog mounted in the upper runner and spring pressed into engagement with the standard, a cross-pin interposed between a portion of the dog and the adjacent edge of the standard, the upper runner being formed with laterally elongated slots, accommodating the ends of said pin and the runner being further formed with an inclined outer wall, and a releasing lever forked to embrace the runner and pivotally connect the ends of said pin and arranged to rideupon the inclined wall of the runner whereby to draw the dog backwardly against its spring tensioning means, the runner being formed with a groove designed for the reception of said releasing lever whereby to hold the same in released position.

5. A lifting jack, comprising'a standard, upper and lower runners mounted to slide in said standard, an actuating lever formed with a trunnion provided with a threaded bore, the upper runner being provided with a bearing 0 ening receiving said trunnion, a screw wor 'ng in said bore, and arranged to hold the trunnion in said opening, and an operative connection between sald actuating lever and the lower runner.

6. A lifting jack, comprising a standard, upper and lower runners mounted to slide on said standard, the lower runner being arranged to grip the standard, an operating lever fulcrumed on the upper runner and having a pitman connectionwith the lower run ner, the upper runner being formed with a cavity, a block rigidly secured in said cavity and formed with a forwardly facing chamber communicating with. the rear edge of the standard, and with an upturned lower end producing a socket in the lower end of the chamber, and an outwardly 'spring pressed dog mounted in said chamber and supported with itslower end in. said socket and arranged for engagement with said runner. I

7. A lifting jack, comprising a standard, upper and lower runners mounted to slide on said standard, the lower runner being ar-' ranged to grip the standard, an operating lever fulcrumed on the upper runner and hav ing a pitman connection with the lower runner, the upper runner being formed with a cavity, a block rigidly secured in said cavity and formed with a forwardly facing chamber and an upwardly facing socket in the lower end of the chamber, and an outwardly spring pressed dog mounted with its lower end in said socket and supported thereby in said chamber, and means connected to the upper end of the dog for drawing it rearwardly as and for. the purpose set forth.

8. A lifting jack, comprising a standard, upper and lower runners mounted to slide on said standard, the lower runner being arranged to grip the standard, an operating lever fulcrumed on the upper runner and having a pitman connection with the lower runner, the upper runner being formed with a cavity, a block rigidly secured in said cavity and formed with a forwardly facing chamber and an upwardly facing socket in the lower end of the chamber, a dog mounted in said chamber and supported with its lower end in said socket and arranged for engagement with said runner, and a leaf spring interposed between the rear side of the dog and the adjacent wall of the chamber and exerting a forward tension upon the dog.

9. A lifting jack, comprising a standard, upper and lower runners mounted to slide on said standard, the lower runner being arranged to grip the standard, an operating lever fulcrumed on the upper runner and having a pitman connection with the lower runner, a dog mounted in the upper runner and spring pressed into engagement with the standard, a releasing lever pivotally connected to the dog, the runner being further formed with an inclined outer rear wall and a groovetherein, and the releasing lever bein arran ed to ride upon said inclined wal whereby to draw the dog backwardly a ainst its spring. tensioning means, the lever eing further arran ed to engage in said roove whereby the ever may be held in re leased position.

In testimony whereof. I aflix my signature in presence of two witnesses.

- JOHN A. PHILLIPS.

Witnesses:

ELMER ONEALL, CHAs. PAGE.

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