US541043A - Lifting-jack - Google Patents

Description

PatientedJun-e 411, 1895.

LIFTING J ACK.

J. C. FORAKER.

IIIII (No Moel.)

:TzRs co.. pHoro-wma., wAsHmmoN D c NITED STATES JOHN O. FORAKER, OF BAXTER SPRINGS, KANSAS.

LlFTlNG-JACK.

VSPEGIFICACLIION forming part of Letters Patent No. 541,043, dated June 11, 1895. Application filed July 30, 18.94. Serial No. 519,039. (No model.)

ject of the invention is to produce a lifting jack which is easily Operated, and which is simple, strong, durable, and inexpensive of whichconstruction.

With this Object in view the invention consists in certain peculiar and novel features of construction and combinations of parts, as will be hereinafter described and claimed.

In order that the invention may be fully understood, I will proceed to describe itwith reference to the accompanying drawings, in

Figure l is a view partly in side elevation and partly in section. Fig. 2 is a vertical sectional view taken on the line 2 2 of Fig. 1, and Fig. 3 is an edge view of the lifting-tackle.

In the said drawings, l and 2 designate standards, which are connected at their upper ends by the cross-bealn 3. These standards, if placed on damp or soft ground, will preferably be provided with blocks 5, 5, so as to provide an extended foot portion or base to prevent them sinking in the ground. Vhen the device is placed upon hard ground,`these foot-portions are not necessary and may be removed. The standard 2, about midway its length, is provided with the verticalslot 6,

and journaled horizontally in bearings carried by said standards, adjacent to or at the upper end of said slot, is a shaft 7, upon which is mounted rigidly the winding-drum 8. Journaled also in said standard, and extending transversely of the slot 6, near its lower end, is the shaft 9, and mounted rigidly upon said shaft, is the grooved pulley Y10.

The cross-beam 3 is provided with a slot 1l, extending vertically therethrough, and mounted rotatably in said slot is the grooved pulley l2. Mounted upon said cross-beam and at the end of said beam above the standard 2, and upon opposite sidesot the slot l1, are the Y ively.

bearing-boxes 13, and journaled rotatably in said bearing-boxes and transversely of said slot, is the grooved pulley lat. A bolt l5 extends transversely of an Opening formed in the cross-beam, and secured rigidly upon said bolt by splicing or in any other suitable manner, is the upper end of a rope or 'cable 16. A lifting block comprises thev vertical and parallel plates 17, and interposed between and secured to said plates, is the block 1S. A grooved pulley 19 is mounted rotatably be tween the upper ends of said plates 17, and this lifting block is placed operatively relative to the rope or cable by passing the free end of said rope or cable around the pulley` 19, th'en vertically upward and forward and over the grooved pulleys 12 and 14, respectthrough the groove .or opening 20, formed vertically in the upper end ot' the standard 2, and isbrought around the grooved pulley 10, thence extends upwardly and around the winding-drum 8, to which it is permanently and firmly secured at its end, as shown at 2l.

Mounted rigidly upon the shaft 7, at the outer side of the standard 2, is a ratchet-wheel 22, and mounted pivotally upon the bolt or pin 23 carried by said standard and above said ratchet`wheel, is a gravity-dog 24, which engages the ratchet-wheel 22, and is adapted to yield and allow said ratchet-wheel to rotate in one direction, and to prevent the rotation ofthe same in theopposite direction. A lever 25 is loosely or rotatably mounted upon the shaft 7, at the outer side of the ratchet-wheel 22, and is held from accidental displacement by the washer and retaining nut 26. This lever is preferably formed with a handle portion 27, or may be provided with an outwardly projecting handle 28, so .as to constitute a crank.

A pawl 29 is provided with a longitudinal slot 30, and said slot sliding engages the pins or bolts 3l, projecting inwardly from the lever 25, and iS of sufficient length to allow the pawl to be moved into or out of engagement with the teeth of the ratchet-wheel, and to accomplish` the automatic disengagement of said pawl from the ratchet-wheel, it is provided .with a beveled lower end 29a, which coming in contact with the beveled or inclined por- The cable is then drawn downwardly IOO tion of the teeth of the ratchet as the leveris moved rearwardly, rides u p over the same, as will be understood.

'lhe plates 17 of the lifting-block are connected at their lower ends by a bolt or pin 32, and pivotally carried by said bolt are oppo sitely disposed grabhooks 33, and the short ordinary hook 34.

In lifting a log or other heavy object, the lifting-block is lowered until the grab-hooks can be engaged upon opposite sides of the log or other object, as shown clearly in Fig. 1. 'lhe lever is now grasped and rotated in the direction indicated by the arrow, Fig. 2, and by reason of the engaging pawl 29 and the ratchet-wheel 22, the shaft 7 is rotated, and this rotation ot' the shaft winds the rope or cable upon the drum S, and raises or elevates tho log or other object from the ground. As the lever is thrown back to its original position, the beveled surface 29 of the pawl, en-

gaging the successively presented teeth of the ratchetavheel, causes said pawl to slide up-l ward upon the guide-bolts 31, to allow this back ward movement ofthe leverto take place, and while this operation is in progress the gravity-dog 24, engaging the ratchet-wheel at its opposite side, prevents its back rotation and the consequent lowering of the log or other object. The operation of the lever as described is repeated until the log or other object is raised to the required height. It necessary to deposit the log or other object in a plane slightly lower than the one to which it has been raised, the dog 24 is disengaged from the ratchetwheel, and the lever is grasped to lower the log or other object slowly.

It will be apparent from the foregoing that heavy objects may be handled with this jack easily and expeditiously, because it takes only half the power to raise the weight by the arrangement of the pulleys and the doubling of the rope or cable at its point ot' connection with the grooved pulley 19, that would be required to raise the weight by a direct pull. 1t will also be apparent by this arrangement that as the weight is equally distributed between two portions of the rope or cable, it is necessary to use a rope or cable of only half the diameter that; would be required in raising the weight where it would be applied directly upon one portion of the cable.

When objects to be elevated are of such forni that they cannot be conveniently engaged by the grab-hooks, the ordinary hook 3l: may be employed in lieu thereof.

From the above description it will be apparent that I have produced a lifting jack which will be of great service in elevating heavy logs, balng-presses, and other heavy bodies, a'nd also lighter objects if desired, and which is simple, strong, durable, and inex pensive of construction and easily operated.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is y 1. In a littingjack, the combination with a suitable framework, a rope, and a shaft havinga drum upon which the lifting rope is wound or unwouud, and a ratchet-wheel, of a lever, provided with headed guide-pins, and a sliding gravity-pawl having a beveled lower end and provided with a slot engaging said guide-pins, substantially as described.

2. In a lifting-jack, the combination with a' pair ot vertical standards, one ot them slotted, a cross-beam connecting the upper ends of the same and provided with a longitudinal slot and a pin, guide-pulleys jourhaled upon said beam and in the vertical plane of its slot, a guide-pulley journaled in the lower end of the slot of the standard, a winding drum 1ocated in the upper end of the said slot, a cable secured at its opposite ends to said winding drum and said pin, and guided around said guidepulleys and through said slots, and a lifting-tackle comprising a body-portion, pendent hooks, and a grooved pulley mounted upon the said cable, with a ratchet-wheel mounted upon the shaft ofthe winding-drum, a lever, a pawl carried by said lever, and a dog supported from the frame-work, substantially as set forth.

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

JOHN C. FORAKER. Witnesses:

M. R. REMLEY, G. Y. THORPE.

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