US1489759A - Lifting jack - Google Patents

Description

pl'l 8 v 1924.

` P. EL HAwKlNsoN LIFTING JACK Filed Nov. 25, 1922 Patented pr.. 8, 182l.

STATES PAUL E. HAWKINSON, OF MINNEAEDLIS, MNNESOTA, SSIGNOR T0 EEEAWKE MANU- FACTURNG CO., GF MNNEPOLIS, MENNESOTA, A CO'RPORTION OF MINNESOTA.

LFTENG- SACK.

Application filed November 25, 1922. Serial No. 603,194.

To all 'whom it may concern:

Beit known that 1, lBAUL E. HAwnrNsoN, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful improvements in Lifting Jacks; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention has for its object to provide an extremely simple and highly e'licient carrying and positioning attachment for lifting jacks intended for general use, but especially adapted for use in jacking up the wheels of automobiles and trucks.

To the above end, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

1n the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a side elevation of a lifting jack having one form of the improved attachment applied thereto;

Fig. 2 is a view partly inplan and partly in section with some parts sectioned on the line 2-2 of Fig. 1;

Fig. 3 is a detail view with some parts sectioned on the line 3 3 of Fig. 1; and

Fig. i is a view corresponding to Fig. 1 but showing another form of the attachment.

rlhe numeral 5 indicates, as an entirety, a lifting jack of commercial form and with the exception of a shaft 6, to the projecting end of which is attached, by a universal joint 7, a two-part folding operating rod or handle 8, the sections of which are connected by a hinge joint 9. To the outer end of the rod 8 is applied a hand crank 10 having a hinge joint 11 which permits said hand crank 10 to be folded onto the operating rod 8.

Referring first to the invention as illustrated in Figs. 1 to 3, inclusive, the numeral 12 indicates a two-part bracket, the members of which are connected and frictionally clamped onto the sides of the lifting jack 5 by a pair of nut-equipped bolts 18. rThese bolts 13 extend through aligned bores in the members of the bracket 12, and are located, the one forward, and the other rearward of the standard of the lifting jack 5v. Ey reference to Fig. 2 it will be noted that the inner face of one of the members of the bracket 12 is vertically recessed at 14 to receive the standard of the jack 5 and thereby securely hold said bracket against angular movement on the lifting jack. On each member of the bracket 12 is a trunnion 15, a perforated ear 16 and a sleeve-like lug 17. A pair of levers 18, in the form of bell cranks, are intermediately fulcrumed on the trunnions 15 and held thereon by cotter pins 19. One of the ends of the levers 18 extend horizontallyA forward from the trunnions 15 and have formed therewith aligned bearings 20 in which is mounted a shaft 21, the ends of which project outward of the bearings 19 and have a pair of wheels 22 journaled thereon and held in position by cotter pins 28.

The other ends of the levers 18 project upwardly and rearwardly and are connected by coil springs 211 to the perforated ears 16. These springs 24 exert snficient force on the levers 18 to downwardly press the wheels 22 to normally carry the lifting jack above the floor as shown in Fig. 1, but will yield and permit the lifting jack to engage the floor when under a load. The downward movement of the wheels 22, in respect to the lifting jack 5, is limited by a pairof depend-V ing stop lugs 25 on the levers 18 between said wheels-and the trunnions 15 and arranged to engage the base of said jack. i

'An arm 26 carried by the bracket 12 is provided for limiting the lifting movement of the operating rod 8 and releasably holds said rod in a raised position, as shown in Fig. 1. As shown, this arm 26 is formed from a single rod folded upon itself, and the ends thereof are inserted in the sleeve-like lug 17 and secured by set screws 27. The intermediate portion of the rod from which the arm 26 is formed, is bent to form a yokelike member 28, at the outer end of the arm 26, adapted to receive the rod 8. rPhe prongs of the member 28 are in converging relation and releasably hold the rod 8 as shown in Fig. 3. By springing the prongs of the member 28 apart, the rod 8 may bedetached from the arm 26.

By turning the hand crank 10 into an upright position, the joint 9 will be inverted, and in which position said joint is locked against upward pivotal movement and thereby holds the two sections of the rod 8 obliquely aligned. ln the upturned position of the hand crank 10 the same may be used as a handle; and by lifting the same, the rod 8, which is held by its engagement with the member 28, lifts the rear end of the jack 5 through the arm 26 from the ground and permits the same to be moved on the wheel 22 to and from a position under an axle or other member to be'lifted. In case the litting jack 5 tips forward when supporting a load, the springs 24 will yield without placing any strain on the levers 18 or wheels 22.

Referring now to the invention as shown in Fig. 4f, the bracket is dispensed with and the trunnions 15, ears 16 and sleeve-like lugs 17 are attached or formed directly with the jack 5.

The above described invention has, in actual usage, proven highly eilicient for the purpose had in View.

What l claim is:

l. A lifting jack having a wheel-equipped lever pivoted thereto7 spring means operative on the lever to downwardly press the wheel with suilicent force to tilt a j ack and partially lift the same above the floor but to yield and permit the jack to engage the floor under a load, and means for operating the jack and by which means the jack may be lifted and moved on said wheel.

2. rlhe structure defined in claim 1 in further combination with a stop on the lever engageafble with the jack to limit the lifting movement thereof by the spring means.

3. A lifting jack having a handle connected thereto by a universal joint and provided with a. vertically movable supporting wheel, yielding means downwardly pressing said wheel with sulic-ient force to normally carry the jack above the 'Hoor `but to yield and permit the ack to engage the iioor under a load, and an arm attached to the ack for limiting the liftingmovement of the handle.

4. The structure defined in claim 3 in which the arm holds the handle in a raised position.

5. The structure defined in claim 8 in which the arm is provided with yielding means for releasably holding the handle in a raised position.

6. A lifting jack having a handle connected thereto by a universal joint and provided with a vertically movable supporting wheel, yielding means downwardly pressing said wheel with suiiicient force to normally carry the jack above the floor but to yield and permit the jack to engage the floor under a load, an arm attached to the jack for limiting the lifting movement of the handle,

and an arm attached to the jack and having at its outer end a yoke-like member adapted to receive the handle to limit the lifting movement thereof in respect to the ack.

7. The structure defined in claim 6 in which the yoke-like member normally holds the handle in a raised position but will yield to release the saine.

8. A lifting jack having a handle connected thereto by a universal joint and provided with a vertically movable supporting wheels yielding means flownwardly pressing said wheel with sullicicnt i'orce to normally larry the jack above the lloor but to yield and permit the jack to engage the floor under a load, an arm attached to the jack for limiting the lifting movement o the handle, and an arm 'for limiting the lifting movement of the handle, said arm comprising a pair of laterally spaced members having one of their ends attached to the jack by sleeve-like lugs.

9. A lifting jack having on each side a. trunnion, a pair ot' levers in the form of bell cranks intermediately tulcrumed on the trunnions, a pair ol wheels journaled on the forwardly projecting end of the levers, a pair of springs connecting the other ends of the levers to the jack and operative. on said levers to downwardly press the wheels with suliicient force to carry the jack above the floor but to yield and permit the jack to engage the floor when under a load, a handle connected to the jack by a universal joint, and an arm attached to the jack for limiting the lifting movement of the handle.

10. Bi lifting jack, a two-part bracket having means for securing the same to the jack, each member or said bracket having a trunnion, a pair of levers mounted on the trunnions, wheels journaled on the trunnions, and spring means operative on thc levers to downwardly press the wheels with sullicient force to carry the jack above the fioor but to yield and permit the jack to engage the door when under a load.

11. A lifting jack having a handle connect-ed thereto by a universal joint, a twopart bracket having means for attaching the same to the jack, each member of the bracket having a trunnion, a pair of levers mounted on the trunnions, wheels journaled on the levers, spring means operative on the levers to downwardly press the wheels with suilicient force to carry the above the floor but to yield and permit the jack to engage the floor under a load, and an arm attached to the bracket for limiting the lifting movement or" the handle in respect to the jack.

In testimony whereof: l aihx mv signature.

PAUL E. HAV/*KINSON

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