US910231A

US910231A - Lifting-jack.

Info

Publication number: US910231A
Application number: US42773208A
Authority: US
Inventors: George E Rider
Original assignee: Individual
Current assignee: Individual
Priority date: 1908-04-17
Filing date: 1908-04-17
Publication date: 1909-01-19
Anticipated expiration: 1926-01-19

Description

G. E. RIDER.

LIFTING JACK.

APPLICATION FILED APR. 17.1908.

Patented Jan. 19, 1909.

UNITED STATES PATENT GFICE.

GEORGE E. RIDER, OF KANSAS CITY, MISSOURI.

LIFTING-JACK.

To all whom it may concern:

Be it known that I, GEORGE E. RIDER, a citizen of the United States, residing at Kansas City, in the cotmty of Jackson and State of Missouri, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification.

This invention relates to lifting jacks, and my object is to produce a device of this character by which immense weights may be easily and reliably raised and lowered by a single operator.

A further object is to produce a device of this character of simple, strong, durable and cheap construction.

With these objects in view and others as hereinafter appear, the invention consists in certain novel and peculiar features of construction and organization as hereinafter described and claimed; and in order that it may be fully understood reference is to be had to the accompanying drawing, in which Figure 1, is a front view of a lifting jack embodying my invention. Fig. 2, is a side elevation with the near leg of the support broken away near its upper end and with the lever in its raised position. Fig. 3, is a central vertical section with the lever in its lowered position. Fig. 4, is a top plan view of the chain anchoring bracket.

In the said drawings, 1 indicates a U-shaped frame pivotally pendent from a bolt 2 upon which is mounted between the arms of the frame a hook 3, for attachment to a suitable support.

4 indicates a bolt secured to the frame and journaled on said bolt is a sheave 5 provided with a wide shallow groove 6 and a communicating deeper and narrower groove 7.

8 indicates an angle bracket receiving and secured to the lower end of frame 1, by bolt 9, the upright arm of said angle bracket being formed with a wide shallow groove 10 and a communicating deeper and narrower groove 11, said grooves respectively occupying the same vertical plane as grooves 6 and 7 of the sheave, and projecting from said bracket at the opposite side from said grooves is a guide loop 12, secured in place preferably, by the bolt 9.

13 indicates a swing frame of inverted-U form pivoted upon bolt 4 between the sheave and the arms of frame 1. A lever comprises the handle portion 14 and the curved portion or head 16 projecting into the swing Specification of Letters Patent.

Application filed April 17, 1908.

Patented Jan. 19, 1909.

Serial No. 427,732.

frame 13 and pivoted thereto as at 16, and pivoted to said lever at 17, near the pivotal point 16 is a bifurcated dog 18 formed with a recess 19 in its inner end for engagement with certain links of a chain engaging sheave 5 and hanging pendently therefrom, said chain comprising alternately arranged

links

20 and 21, the former being disposed edgewise to the sheave so as to be capable of fitting in the deep and narrow groove 7 and the deep and narrow groove 11 of bracket 8, and links 21 arranged flatwise with respect to the sheave and adapted to occupy the wide shallow groove 6 of the sheave and the wide shallow groove 10 of the bracket, the rear portion of the chain extending downward through the guide loop 12 and being equipped with lifting tongs 22, for engagement with the object to be lifted or the chain may be otherwise connected with the object.

The mechanism described may be suspended by hook 3 from any suitable support, that shown being of a character especially adapted for use in connection with hay presses and being constructed as follows:-

23 indicates a pair of legs adapted to rest upon the ground and converge upward when operatively disposed and secured at their upper ends as shown or otherwise to a pair of plates 24 which overlap at their inner ends and are pivoted together at 25 and are provided in said overlapping ends wit-h registering holes 26 to receive the hook 3, the pivotal connection with plates 24 permitting the legs tobe folded together in substantially a parallel relation when not in use, for convenience in transportation.

Assuming that the parts are in the posi tion shown in Fig. 2, and that the tongs are engaged with the object to be lifted, it will be noticed that the upper end of one of the edgewise links is fitting in the recess 19 in the inner end of the dog and that the front inner corner of said dog is disposed between said link and the link next in advance and is pressing said links and the connecting flatwise link firmly against the sheave so that as the operator pulls downward upon the lever the chain moves in the direct-ion indicated by the arrow, Fig. 2, from the position shown in said figure to the position shown in Fig. 3. In such operation the rear portion of the chain travels upward through guide loop 12 which tends to restrain swinging movement of the object lifted, and it will be noticed that just before the termination of the full downward stroke of the lever, the fiatwise link passing through groove 10 of the anchor bracket, is forced outwardly therein by the inclined or cam face of the lower end of said groove and that as such lever movement terminates said link clears the lower end of said bracket and swings back under the narrow grooved portion of said bracket, the edgewise link next above swinging back into the narrow groove to accommodate such movement so that the said underlying flatwise link shall be anchored against upward or reverse movement and thus hold the object at the height to which ithas been raised. The lever is then raised, this action withdrawing the dog from engagement with the chain, the dog fulcruming at its rear corner upon the edgewise link partially occupying recess 19. As the lever is thus operated the swing frame 13 with the lever and dog swing rearwardly through frame 1 to their original positions and the dog assumes an operative relation to new links of the chain. By repeating the operations described the object can be lifted and sustained at the desired height.

To lower an object supported by the tongs the lever is first disposed substantially as shown in Fig. 3 and while holding the same the operator grasps the pendent front portion of the chain and .pulls forward to effect its release from the anchor bracket, and as this object is accomplished he permits the lever to move upwardly under the weight of the descending object, the chain being released so that the next flatwise link below that previously referred to will engage the anchor bracket in the manner described and sustain the object until the lever can be again lowered to the position shown in Fig. 3 preliminary to the next lowering movement of the object, it being obvious that before each of such operations of the lever, the front portion of the chain must be disengaged from the anchor bracket because under its gravitative tendency each fiatwise link which passes through the grooved arm of the anchor bracket in either direction automatically acts to anchor the chain.

From the above description it will be apparent that I have produced a lifting jack possessing the features of advantage enumerated and I wish it to be understood that I do not desire to be restricted to the exact details of construction shown and described as obvious modifications will suggest themselves to one skilled in the art.

Having thus described. the invention what I claim as new and desire to secure by Let ters-Patent, is

1. A lifting jack, comprising a suitably supported sheave having a wide groove and a communicating narrow groove, an anchor bracket suitably supported below the sheave and provided with a wide groove and a communicating narrow groove in the planes respectively of the wide and narrow grooves of the sheave, and a chain engaging the sheave and the anchor bracket and consisting of edgewise links to engage the narrow grooves of the sheave and bracket and flatwise links to engage the wide grooves of said sheave and bracket.

2. A lifting jack, comprising a suitably supported sheave having a wide groove and a communicating narrow groove, an anchor bracket suitably supported below the sheave and provided with a wide groove and communicating narrow groove in the planes respectively of the wide and narrow grooves. of the sheave, the base of the wide groove at its end remote from the sheave diverging outwardly from the base of the shallow groove to increase the depth of the corresponding end of the latter, and a chain engaging the sheave and the anchor bracket and consistinguof edgewise links to engage the narrow grooves of the sheave and bracket and flatwise links to engage the wide grooves of said sheave and bracket; said flatwise links being adapted to underlie and bridge the deepened end of the narrow groove of the bracket.

8. A lifting jack, comprising a suitably supported sheave having a wide groove and a communicating narrow groove, an anchor bracket suitably supported below the sheave and provided with a wide groove-and a communicating narrow groove in the planes respectively of the wide and narrow grooves of the sheave, a chain engaging the sheave and the anchor bracket and consisting of edgewise links to engage the narrow grooves of the sheave and bracket and flatwise links to engage the wide grooves of said sheave and bracket, and a guide loop underlying the grooved periphery of the sheave at the opposite side of its axis from the groove of the anchor bracket as a guide for the chain.

a. A lifting jack, comprising, a suitably supported sheave having a wide groove and a communicating narrow groove, an anchor bracket suitably supported below the sheave and forth over the sheave, a lever pivoted to said frame, and a dog carried by said lever and adapted to project into the space between contiguous edgewise links and clamp the chain firmly against the sheave.

5. A lifting jack, comprising a suitably supported sheave having a wide groove and a communicating narrow groove, an anchor bracket suitably supported below the sheave and provided with a wide groove and a communicating narrow groove in the planes respectively of the wide and narrow grooves of the sheave, a chain engaging the sheave and the anchor bracket and consisting of edgewise links to engage the narrow grooves of the sheave and bracket and fiatwise links to engage the wide grooves of said sheave and bracket, a swing frame to swing back and forth over the sheave, a lever pivoted to said frame, and a dog carried by the lever and provided with a recess in its inner end to receive an end of one of the edgewise links and to clamp the same and the engaging fiatwise link firmly against the sheave.

6. A lifting jack, comprising a frame suitably supported, a sheave journaled therein and provided with wide and narrow communicating grooves, the narrow groove being disposed inward and centrally of the wide groove, a bracket secured to the lower end of said frame and provided with a substantially upright arm formed with a wide groove in the vertical plane of the wide groove of the sheave, and a narrow communicating groove in the vertical plane of the narrow groove of the sheave, the base of the wide groove of said arm at its end most remote from the sheave sloping downwardly and forwardly and deepening the corresponding end of the narrow groove, a chain engaging the sheave and arm of the bracket and consisting of edgewise links to engage the narrow grooves of the sheave and arm and flatwise links to engage the wide grooves of the said sheave and arm of the bracket, a swing frame adapted to swing back and forth through the first-named frame and pivoted at its lower end at opposite sides of and coincidently with the sheave, a lever pivoted within the swing frame, and a dog pivoted to and projecting inwardly from said lever and provided with a recess in its inner end to receive a portion of either of the edgewise links while in engagement with said sheave.

7. A lifting jack, comprising supporting legs, plates secured to their upper ends, a hook suspended from said plates, a substantially-Ushaped frame pivotally suspended from said hook, a bolt connecting the arms of the frame, a grooved sheave journaled on said bolt, an anchor bracket secured to the lower end of said frame and provided in the vertical plane of the groove of the sheave with communicating wide and narrow grooves, a chain extending over the grooved sheave and hanging pendently therefrom at one side and extending through the grooved portion of the bracket and comprising edgewise links to snugly engage the narrow groove of the bracket and fiatwise links to successively engage the wide groove of the bracket, an inverted-U shaped swing frame to operate within the first-named frame and pivoted at its lower end upon said bolt at opposite sides of the sheave, and a dog pivoted to said lever and provided with a recess in its inner end to engage one of the edgewise links of the chain to clamp the latter firmly against the sheave.

8. In a lifting jack, an anchor bracket having one arm provided with communicating wide and narrow grooves, the base of one end of the wide groove diverging with respect to the corresponding end of the narrow groove to increase the depth of the latter at such end.

In testimony whereof I Zlil'lX my signature, in the presence of two witnesses.

GEORGE E. RIDER.

lVitnesses H. C. Ronenns, G. Y. THORPE.