US535903A - Lifting-jack - Google Patents

Description

(N0 Model.)

HOLMES. 4

LIPTING JACK,

No. 535,903. Patented Mar. 19, 1895.

UNITED STATE PATENT @nrrcnt MILO P. HOLMES, OF SAN FRANCISCO, CALIFORNIA.

LIFTING-JACK.

SPECIFICATION forming part of Letters Patent N 0. 535,903, dated March 19, 1895. Application filed February 20, 1894. Serial No. 500,878. (No model.)

To all whom it may concern:

Be it known that I, MILO P. HOLMES, a citizen of the United States, residing in the city and county of San Francisco, State of California, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification.

My invention relates to improvements in lifting jacks for raising wagons and trucks, moving machinery, replacing cars on tracks and other similar work.

It is an improvement on the lifting-jack for which Letters Patentof the United States were issued to me on the 19th day of August, 1890, numbered 434,712, and it consists in certain novel construction and combination of the post or standard, in means for holding the lifting-lever, and in novel means for holding the movable dog or rest at any point on the standard independently of the liftingbar whereby the lever can be withdrawn and shifted to take afresh lift on the dog.

The nature of these improvements and the manner in which I construct and produce the same will be understood from the following description and the accompanying drawings which is referred to by figures and letters.

Figure 1 represents a lifting-jack constructedaccording to my invention with the movable dog or rest locked on the standard and withthe lifting lever setting clear of the dog. Fig. 2 is a side-view of the same parts showing the lifting-lever removed from the standard. Fig. 3 is a front-view on an enlarged scale looking toward the notched edges of the standard, and showing the top and the bottom ends of the standard and the base partly in section. Fig. 3 is a top-view of the standard looking down upon the upper end. Fig. e is a plan of the base, the upright bars that form the standard being cut ofi just above the base. Fig. 5 is a view of the movable dog or restin longitudinal section. Fig. 6 is a perspective View of the same piece.

The frame or standard ofmy lifting jack is composed of the flat bars A-A- united by a spacing-block of metal at the upper end, and by screw-bolts near the bottom, and having notches or teeth a. -a along one edge to form rests and bearing-points for the fulcrum-pin fof the lifting-lever. The lower ends of the uprights are fixed in the base-plate -C by bolts set through the bars and through the central upright Web C The slidable lifting-dog or rest -D differs from the corresponding piece in other lifting jacks of this description in being formed with a central web D- dividing it inside into two separate sockets, one for each upright-bar of the standard. The addition of this piece serves to keep the toe in position and to overcome the tendency to twist or set out of line while being lifted by the lever as well as to increase the strength of this piece. 0n the back of this piece D are formed ears -d* to which are attached by a loose joint -d a locking-piece composed of a latch --E having an eye in one end to receive the pin d of the joint, and at the other end a cross-bar E of suitable length of projection to take into the notches in both bars of the standard, when the piece -E is turned up perpendicularly as shown in Fig. 1.

The lifting-lever F is of the usual construction with a curved cam-shaped lower end and a handle-portion on the upper end and with a fulcrum-pin -F properly formed to set into the notches of the standard. The lever is of suitable thickness to fit in and work smoothly in the slot or opening between the side-bars A- of the standard.

On the front or inner edge of the liftinglever is formed or fixed afinger or projection --G standing out perpendicularly and also rigidly from the lever over and in line with the camshaped end below, and this piece Gin thickness corresponds with the width of space between the parallel inner faces of the two uprights of the standard and exceeds very slightly such width between the uprights,

so that while the finger will enter between the two uprights it is necessary to exert some pressure against the lever when in upright position, in order to force the finger into the slot or opening between the. uprights. The finger being thus-tightly fitted to the slot will act to hold the lever in position when it is turned upright, and consequently the lever cannot drop down as long as the finger sets into the slot and it will remain in whatever position it is shifted and set along the standard.

The dog or rest -=-D- on which is set the axle or other part to be raised can be locked at any point along the standard by turning up ICC the latch -E, and setting the cross-bar E on the end into the notches on the edge of the standard, and the weight on the toe-piece bein g thus sustained by the latch, it will be seen that the lever F can be shifted along the standard to take a fresh hold for another lift.

Having thus described my invention, what I claim, and desire to secure by Letters Patent,is 1

1. In a lifting-jack, the slotted standard composed of the upright bars AA provided with spaced notches on the edges, the base-plate O having a central-up right web C setting between the ends of the upright and to which the said bars are bolted, and the spacing-blockbetween the upper ends of the said bars, in combination with a slidable-dog embracing and movable on the said bars of the standard, and the lifting-lever F-having acamshaped lower end adapted to work between the said bars of the standard, and a cross-pin F fitting into the notches of the said bars and forming a fulcrum-point for the lever; the said cam-shaped end of the lever and the lifting-dog being disconnected from each other, whereby one part may be shifted and adjusted independently of the other part, substantially as shown and described.

2. In a lifting-jack, the combinationwvith the slotted standard formed of parallel bars AAwith notches on their upright edges, of the slidable-dog D- embracing the said bars, and having its central opening divided by 2L-W6b that is fitted to move between the said bars, the hinged latch E on the heel of the said part D- adapted to engage the notches in the standard and the lifting-lever F- provided with a camshaped end to act against the part D and a fulcrum-pin 6 F fitted to the standard, said lever being adjustable in the standard independently of the part- D, substantially as shown and de scribed.

, 3. In a lifting-jack, the, combination with 5 a notched standard of a slidable-dog, a lifting-lever having a fulcrum-pin to engage the said notches and provided with a cam-shaped end which is adapted to set against and raise said dog on the standard by contact with that said piece and by the movement of the lever on its fulcrum-pin, and the hinged-latch on the slidable-dog as a means for locking the said dog on the standard and holding it at any point thereon independently of the liftinglever, substantially as shown and described.

4. The herein-described lifting-jack comprising the standard formed of the parallel bars -AA-- provided with notches on their upright edges, the slidable-dog D embrac- 6o ing the said bars and having a central web in the space between the bars of the standard, the lifting-lever F setting between the said bars, and having at one end a camshaped part and a fulcrum pin F and at the opposite end the projecting finger G, and the hinged latch -E on the back of the slidable-dog provided with the cross-bar E engaging the notches of the standard constructed and arranged for operation as 7: shown and described.

In testimony that I claim the foregoing I have hereunto set my hand and seal.

MILO P. HOLMES. [L. s]

Witnesses:

O. W. M. SMITH, CHAS. E. KELLY.

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