US284975A - Lifting-jack - Google Patents

Description

(No Model.)

WITNESSES F 1:. 07471471 G. W. NULL.

LIFTING JACK.

Patented Sept. 11,1883.

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GEORGE \V. NULL, OF GREEN MOUNT, PENNSYLVANIA.

LIFTING-JACK.

srncrrrcn'rro v' forming part of Letters Patent No. 284,975, dated September 11, 1883.

(N0 model.)

To aZZ whom it may concern:

Be it known that I, GEORGE W. NULL, a citizen of the United States, residing at Green Mount, in the county of Adams and State of Pennsylvania, have invented a new and useful Lifting-Jack, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to lifting-j acks; and it has for its object to provide means possessing superior advantages in point of simplicity, durability, inexpensiveness, and general efiiciency.

To attain the aforesaid objects the said invention consists in certain details of construction and combination of devices, as hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view of my improved liftingjack in position for use. Fig; 2 is a vertical section of the same, and Fig. 3 is a crosssection.

Like letters refer to corresponding parts in the several figures.

Referring to the drawings, A designates thebase of my improved lifting-jack, having a standard, B, erected thereon, said standard being fluted at a, along the back portion, and having a rl-shaped portion, 12, extending from the flutes a of the standard. 1

Flanges c extend from'the fnont of the standard, and on said flanges rests the face-plate O, which is fastened to the front of said standard, and between the faceplate and the latter a space, D, is provided, in which a rack-bar, E, moves vertically. As shown, the rack-bar is approximately T-shaped in cross-section, the extended back part, 6, fitting in the portion 1), while the broad front face -of the rack-bar is formed with downwardly-inclined teeth.

F designates a proj ectionformed on the eX- treme lower end of part 6 of saidrack-bar, said projection sliding vertically in the FI-shaped portion of the standard, which is slotted to permit said vertical movement.

It will be seen that the upper end of portion 12 of the standard is not slotted, and thus the vertical movements of the rack-bar will be limited by the projection F striking against the same. By means of the projection, the

rack-bar can be lifted from the base to any certain height, and then by manipulating the jack, as hereinafter explained, the weight on top of the rackbar will be raised to the desired height. o .i r

G designates a lever having a handle, H, socketed therein, said lever carrying a segment, I, at its inner end, engaging with the teeth on the rackbar. The lever is j ournaled in inclined slots 9, formed in brackets J, projecting from the face-plate, the lower portion of the slots being elongated at one side, as shown at 01, to permit the journals of the lever to rest in the elongated portion when the lever is depressed.

It will be seen that by lifting the lever to ward the upper ends of the slotst' the segment on said lever will'be released from contact with the teeth on the rack-bar, and thus said rack-bar will be allowed to descend if the pawl hereinafter mentioned is removed from engagement with the same.

' K designates a pawl fitted on a shaft, k, j ournaled in the brackets J, and provided with a crank, L, for operating or disengaging the same. Said pawhwhen the jack is in position for use, is engaged with the teeth on the rackbar, and the heavier the weight placed on the rack-bar the more surely will thepawl engage the teeth of the rack-bar. The downwardly-inclined teeth, in connection with the pivoting of the pawl, accounts for this fact, and while the rack-bar cannot move downwardly when the pawl is engaged therewith, yet, when the lever is operated to raise the rack-bar, the pawl slides over and catches un der the succeeding teeth of the bar.

The operation of my invention is obvious. When it is desired to raise the rack-bar to a 0 certain heightfor instance, up to the axle of a vehiclethe rack-bar is operated by means of the projection, which is caught hold of by the hand, and thus the jacket can be operated with ease until it touches the object, thereby requiring but a few strokes of the lever to raise the vehicle-axle. The manner of raising the same is as follows: The pawl and segment are both engaged with the teeth 011 the rack-bar, and when the lever,with its journals, is raised in the slots the segment is disengaged from the teeth. Then by depressing the lever until its journals rest in the elongated portions 11 of the said slots the segment engages again with the teeth of the rack-bar and moves the latter upward, the pawl being constantly engaged with the said rack-bar, so as to hold it from downward movement. This vertical movement of the lever will raise the object to the required height, and the rack-bar can be lowered by raising the lever in the slots, the

segment being released from contact with the teeth on the rack-bar, and then disengaging the pawl from said teeth, the rack-bar thereby descending.

My improved lifting-jack is durable, simple in construction, and efficient in operation. It lifts direct from the lower as well as the upper end of rack-bar, and has a short leverage, and therefore great lifting-power. The operation of raising the objects can be performed in an almost incredible space of time, while besides the aforesaid advantages my improved liftingjack possesses others of minor importance, which need not be recited here.

It is obvious that various modifications can be made without departing from the spirit or scope of my invention.

Having described my invention, I claim as my own 1. In a lifting-jack, the standard erected on a suitable base and having a rack-bar moving vertically in the same, in combination with a lever journaled in brackets projecting from the face-plate of said standard, and provided with a segment at its inner end, engaging with the rack-bar, and a pawl j ournaled in said brackets and having a crank, for the purpose set forth.

2. In a lifting-jack, the standard erected on, a suitable base and having a rack-bar moving vertically in the same, a projection on therear end of the rack-bar moving in a slot formed in the back portion of the standard, and a faceplate provided with brackets and attached to the front of the standard, in combination with a lever journaled in slots 9 of the brackets, and provided with a segment at its inner end engaging with the rack-bar, and a pawl j ournaled in said brackets and having a crank, for

. brackets above the lever and provided with a crank,,and the slots g, havingelongations z, in which the journals of the lever rest when depressed, all arranged and operating for the purpose set forth.

4. In a lifting jack, the. fluted standard erected on a suitable base, and having a l"'lshaped portion, 1), extending from the flutes of said standard, in combination with the rackbar formed with an extended back part, 6, and a projection, F, on the lower end of said part, sliding in the slotted lower end of portion 1), substantially as set forth.

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

GEORGE XV. NULL.

W'itnesses: Y

J. A. KITZMILLER, J AMES A. XVEIKERT.

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