US1481822A - Jack - Google Patents

Description

w. BENGEL 7 Jan. 29. 4

JACK

4 TTORNEYS Jan. 29, 1924. 1,481,822

. w.- BENGEL JACK Filed Oct. 7, 1922 2 Sheets-Sheet 2 l I I A TTOH/VEYS Patented Jan. 29, 1924.

UNHED STATES WILLIAM BENGEL, 0F NEVZPORT, ARKANSAS.

JACK. 7

Application filed October 7, 1922. -Se1'i a1 No. 592,954.

gagement of the part or parts to be raised at a point close to the ground on which the jack rests, and thus capable of effective use where the ordinary jack cannot be employed.

In my improved jack a lever having means at one end to directly engage the part or' parts to be lifted, works up and down upon an upright extending vertically from a ground engaging supporting plate, by vir-.

ture of opposing sprlng controlled 'dogs which engage oppositely disposed ratchet faces of the upright. At the opposite end of the lever is a handle and in addition to its other parts the lever carries a dog releasing member and an actuating and controlling element for the dog releasing member whereby the dogs may be forced and held out of engagement with the ratchets of the upright in order to permit of lowering movement of the lifting lever. My invention also contemplates the provision of a lever the dogs of which are so formed as to bring about binding engagement between the same and the upright when the lever lowers under a weight supported thereby, capable of manual release upon downward pressure upon the handle end of the lever.

In the accompanying drawings which illustrate my present invention and form a part of this specification,

Figure 1 is a perspective view of my improved jack with the handle removed,

Figure 2 is a detail perspective view of the handle,

Figure 3 is a detail perspective view of one of the dogs,

Figure 4 is a fragmentary side view of a portion of the uprightand the lever, the latter partly broken away and in section,

Figure 5 is a detail perspective view of the dog releasing wedge and portions of the dogs engaged by the wedge, and

Figure 6 is a perspective view of a portion of the lifting lever with the dogs removed;

Referring now to these figures and particularly to Figure 1, my invention contemplates a rectangular upright 10 rising from any suitable form of flat base 11 adapted to rest upon the ground or similar support, the opposite edges of which upright are provided with ratchet teeth 12, and the opposite sides of which upright have central longitudinal grooves 13. j

The lifting lever proposed by my invention is preferably of elongated form rectangular in cross section as indicated at 14, having at one end a reduced polygonal exten sion '15, the latter adapted to receive thereover the end socket 16 of a handle 17. The opposite end of this lever has a claw shaped extension 18 for direct engagement with the work to be lifted, and its body is provided with a longitudinal slot 19 through which the upright 10 extends, and has opposing inwardly projecting lugs 20 centrally of the opposite sides ofits slot 19 which extend into the side grooves 13 of the upright and thus position the latter centrally of the slot 19 of the lever, these lugs being rounded so that the lever can be rocked up and down on the upright,

Within opposite ends of the slot 19 of the lifting lever 14, a pair of lifting dogs 21 are pivoted upon transverse pivot bolts 22, these dogshaving reduced engaging extensions 23 projecting below the lever and normally held in engagement at their lower free ends with the ratchet edges 12 of the upright 10 by virtue of springs 24 whose lower inner fre ends engage the lower portions of the dogs and whose upper outer ends are fixed to the body of the lifting lug by screws or like anchoring members 25, adjacent to opposite ends of the lever slot 19. With the parts as thus far described it is obvious that upon association of the handle 17 with the handle receiving end of the lever 14, the latter may be oscillated vertically and will mount the upright 10 so that during such oscillation the latter will force vertically shifting movement of the lever.

In releasing the lifting lever for downward movement on the upright it is obvious some means must-be provided for disengaging the dogs 28 from the upright ratchets. To do this I provide a vertically shiftable dog releasing member whose lower portion is in the nature of a dog engaging spreader 26 and whose upper reduced shank 27 is slidable along one side of the body of the lifting lever and has a laterally outstanding pin projecting through the arcuate slot oi a control lever 25 fulcrumed upon a pivot bolt laterally outstanding from one side of the body of the lifting lever and havat its opposite end a handle 32. Thus the lower we ge shaped head 26 oi this releasing member is, upon downward move- 2 of the member forced to spread the er portions of the dogs 21 apart. This wedginu head engages the dogs by virtue of lat-era lly outstanding angular extensions 33 at the low t-r ends of the dogs, and is held centralized between the dogs at all times by virtue o t its inwardly projecting vertical rib 3e wl .Ctll extends into and is movable within one of the side grooves 13 oi": the upright 10.

it will be observed that the upper portions of the dogs 21 inwardly beyond their pivots 22, have convexly rounded upright engaging surfaces so disposed as to come into c't-ion when, after downward movement of tl e dog releasing member, the lifting lever lowers on the upright under a weight as for instance the work upon its work engaging end 18. It is obvious that under such circumstances the work engaging end will be depressed below the handle, end of the lever and thus the rounded upper inner portions of the dogs will come into binding engagement with the ratchet edges of the lever so as to act as a check against too rapid lowering movement, which binding engagement may be released in whole or in part bymanual pressure of the operator downwardly upon the handle end of the lever.

It is also obvious that by virtue of this construction and arrangement of" parts the lifting lever including its work engaging end, may be lowered to and against the flat supporting base 11 and may engage work at a level but slightly above that of the sup porting surface on which the jack as a whole rests. By the use of an elongated handle 17 and by virtue of the close proximity of the work engaging end of the lever to the upright, considerable leverage may be eX- erted in the lifting of the work, and it is equally obvious that instantaneous release may be effected when it is desired to permit the work to be again lowere I claim:

1. A jack including an upright having a supporting base and opposite ratchet faces,

a lever slidably guided on the upright and oscillatable with respect thereto, said lever being directly engageable with the work at one end and having an opposite handle end, spring controlled dogs pivotally supported by the lever and having depending portions engaging the ratchet faces of the upright, and a member carried by and shiitable with the lever and movable between and in engagement with the engaging portions of said dogs to force the latter out of engagement with the ratclvt :faces of the said upright.

2. A jack including an upright having a supporting base and opposite ratchet faces, a lever slidably guided on the upright and oscillatable with respect hereto, said lever being directlyvengageable with the work at one end and having an opposite handle end, spring controlled dogs pivotally supported by the lever and having depending portions engaging the ratchet races of the upright,

and .a member carried by and shiftable with the lever and movable between and in engagement with the engaging portions of said dogs to force thelatter out of engagement with the ratchet faces of the said upright, said dogs having upper inner convexly rounded surfaces opposite their pivots, normally spaced from the adjacent faces of the upright and movable into binding engage ment with the latter upon tilting of the lever with respect to the upright.

3, A jack including an upright having a supporting base and opposite ratchet faces, a lever slidably guided on the upright and oscillatable with respect thereto, said lever being directly engageable with the work at one end and having an opposite handle end, and opposing spring controlled dogs carried by the lever and engaging the opposite ratchet faces of the upright, said dogs having laterally projecting angular extensions at their lower engagin ends, a wedge member vertically .shiftabie at one side of the lever engageable with the said extensions of the dogs to force the latter out of engagement with the ratchet races of the upright, and a controlling and actuating lever for the said wedge tulcrumed upon the adjacent side of the lifting lever and operativ-ely connected to the wedge as described.

' VILLIAM BENGEL.

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