US1347862A

US1347862A - Jack

Info

Publication number: US1347862A
Application number: US341106A
Authority: US
Inventors: William T Learmonth
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-11-28
Filing date: 1919-11-28
Publication date: 1920-07-27
Anticipated expiration: 1937-07-27

Description

W. T. LEARMONTH.

JACK.

APPLICATION FILED NOV- 28, 1919.

1,347, 2, Patented July 27, 1920.

IN VENTOP WITNESSES ATTOPNE Y UNITED STATES WILLIAM 'r. LEARMON'FIH, or PORTAGE, WISCONSIN.

, JACK.

To all whom it may concern.

Be' it known that I, WILLIAM THOMAS LnARMoN'rH, a cltizen of the United States,

and resident of Portage, in the county of Columbia and State of WVisc'onsin, have invented new and useful Improvements in Jacks, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

The invention relates to lifting jacks and more particularly to one for removing racks from or placing them on wagon bodies.

The object of this invention is to provide a jack which will accommodate itself to the tilting movements of the rack frame during its removal from or disposition on the wagon body. To accomplish this purpose the ack is pivotally supported at its upper end in a supporting frame and as the end of the rack frame swings about one of its ends the jack swings also to accommodate this swinging movement of the rack.

The invention further consists in the novel arrangement and combination of parts hereinafter described and more particularly defined by claims at the conclusion hereof.

In the drawings: Figure 1 is a side elevational view of the device embodying the invention; Fig. 2 is an end view of the device, parts being broken away and parts being shown in section; Fig. 3 is a section taken on the line 33 of Fig. 2.

The supporting frame consists of a pair of metal frame members 4 having vertically disposed portions 5 and diverging lower portions 6. These members are secured together in spaced relation by U-shaped bars 7 and Sconnected to the upper and lower ends of the portions 5. The lower ends of the portions 6 are provided with spaced holes 6 so that foot members 9 may be ad justably secured thereto by bolts 10, said members 9 having angle iron bases 11 secured to bars 12 and braces 18.

The frame members 4 have bearings 14 in their upper ends receiving trunnions- 15 carried by a swinging jack frame 16. This 7 frame is of open rectangular construction having a rack face 17 in one side thereof and alined guide openings 18 in the ends thereof.

A lifting bar 19 is slidably mounted in the guide openings 18 and is provided with a rack face 20 facing the rack 17. A pinion 21 meshes with both of the

racks

20 and 17 Specification of was 1 mm. -P t t d-Jul'y Application filed November 28, 1919. SeiiaLNo. 341,106.

crank'handle 23 so that as the; shaft 22 is turned the pinion-21 moves along the rack 17and the-bar 19 is moved by the pinion. Thisaction'causes the bar 19to move twice and iskeyed to' a shaft 22 provided with a the distance it would travel were it operated by a pinion having a relatively fixed position. To prevent accidental descentof the bar 19 while it is being lifted, or to hold it in adjusted position, a pawl 24 pivotally mounted on,the frame 16 engages with the teeth. For lowering the bar 19 this pawl may; be swung out of engagement with the rac 7 Guide plates 25 mounted on the shaft 22 serve to hold the pinion in line with the frame 16 and bar 19.

As shown in Fig. 1, the rack frame 16, as the rack bar 19 is raised or lowered with respect thereto, is free to tilt in the supporting frame so that the end of a rack frame member 26 may be raised or lowered without changing the position of the supporting frame. In case it is desired to move a hay rack from the body of a wagon, the

operator first raises the rear end, the hay rack swinging on its front end as. it is raised and the upper end of the rack bar being free to swing inwardly. The rear end is raised to a position where it may rest upon a stationary support and then the jack is moved to the front of the wagon and the front end of the hay rack is then raised upon a stationary support, the swinging of the rack bar again assisting in this operation. I

It will be noted that the transverse portions of the members 8 and 7 will serve to limit the tilting movement of the jack I and provided with a rack, a lifting bar slide ably mounted in said jack frame and pro.- vided with a rack, a pinion meshing with both racks, and means swinging with the jack frame to turn said pinion,

2. In a lifting jack, the combination. of a supporting frame having bearings near its upper end and frame members above and below said bearings to limit the-movement of the jack frame, a jack frame carrying 5 trunnions vertically swlngingly mounted 1n sand bearings, a lifting bar shdably moilht edLin said jack frame, andimeans cerriedby the jack frame for rai sing and lowering said lifting bar. V

0 3. In a lifting jack,the combination of a siipportingfren e, an open rectangular jack frame pi' otelly mounted intermediate its end on the upper portion of said supporting frame, one of the sides of said jack 15 frame beingprovided with a rack and the ends of said jack frame having alined openings, a rack bar slidebly mounted in said openings and provided with a rack facing the first named rack a pinion meshing With both racks, a crank shaftsecured to said 20 pinion, and a retaining pawl pivotelly supported on seidjack frame and engageable NVith the-rack on thelifting bar.