US802023A

US802023A - Hoisting mechanism.

Info

Publication number: US802023A
Application number: US26474705A
Authority: US
Inventors: Daniel W Smith
Original assignee: International Harverster Corp
Current assignee: Navistar Inc
Priority date: 1905-06-12
Filing date: 1905-06-12
Publication date: 1905-10-17
Anticipated expiration: 1922-10-17

Description

PATENTBD own, 1905.

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D. W. SMITH. HOISTING MECHANISM.

APPLICATION FILED JUNE 12 1905 We or @0112??? (a Sufi/1;

UNITED STATES PATENT OEETCE.

HARVESTER COMPANY, A CORPORATION OF NEW JERSEY.

HOlSTING MECHANISM.

Specificationof Letters Patent.

Patented Oct. 17, 1905.

Application filed June 12,1905. Serial No. 264.747.

T rtZZ whom it may concern:

Be it known that I, DANIEL W. SMITH, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Hoisting Mechanism, of whichjhe following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to hoisting mechanism in general, and is particularly designed for application to corn-shocking machines.

It consists in a drum adapted to receive the lifting-cable and having a ratchet-toothed wheel or rim secured thereto and a lever mounted upon the axis of the drum and adapted to vibrate thereon and having gravity-pawls adapted to engage with the ratchet-teeth in a manner to control the movement of the drum.

It further consists in an improved construction of the drum, the support, and pawls whereby the latter are automatically disengaged from the ratchet-teeth, and one of them may be caused to operate as a brake for the purpose of controlling the movement of the drum in one direction.

The objects of the invention are to provide a mechanism that will be both strong and effective and one that will readily control the movement of the drum in raising or lowering the load. 1 attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a side elevation of a corn-shocking machine having my invention forming a part thereof, and Figs. 2 and 3 are detached details of the hoisting mechanism. V

Similar reference-numerals refer to similar parts throughout the several views.

1 represents the frame of the machine, upon which is rotatably mounted a mast 2, that is suitably supported in an upright position by means of the braces 3 and 4:, and 5 is the shockforming standard, which may be supported on the machine and connected with the mast in any of the usual ways. Secured to the mast is a fixed bracket 6, and rotatably mounted on the bracket is a winding-drum 7, provided ,with a ratchet-toothed rim 8. An operating-lever 9 is pivotally mounted upon the axis of the drum, and a gravity-pawl 10 is pivotally mounted thereon. A gravity-pawl 11 is pivotally mounted upon the mast 2 and adapted to engage with the toothed rim of the drum in a manner to normally prevent a backward rotation of the same. The pawl 10 is wider at its operative end than the ratchettoothed rim, and 12 is an upwardly-projecting ear forming part of the bracket 6. The ear portion projects within the path of the operative end of the pawl 10 when the lever 9 is nearing the downward limit of its movement and is provided with a cam-surface that contacts with the pawl and disengages it from the ratchet-toothed rim. The lever 9 is provided with an upturned toe portion 13, designed to contact with a widened portion of the operative end of the pawl 11 in a manner to disengage it from the ratchet-toothed rim at approximately the same time as the pawl 10 is disengaged. The pawl 11 is provided with a downwardly-hanging wing 14, that lies adjacent the inner side of the toothed rim and is provided with a laterally-projecting shoe portion 15, that is adapted to contact with the inner surface of the toothed rim in a frictional manner when the pawl is released and operate as a brake to govern the backward movement of the drum.

When the hoisting mechanism is operated to lift the weight, the pawl 10 as the lever 9 is moved upward and downward is disengaged and engaged with the toothed rim and the pawl 11 operates to hold the weight when the pawl 10 is disengaged in the well-known way. When used in connection with a cornshocking machine. the shock is raised, as above stated, and the lever 9 is operated as a sweep to turn the mast in its supports and swing the shock clear of the machine. If it be desired to drop the shock directly upon the ground, the lever 9 is depressed until the pawls 10 and 11 are released, and the drum is then left free to turn under the strain of the cable. If it be desired to allow the shock to gradually approach the ground, the lever 9 is depressed until the shoe engages the inner surface of the ratchet-rim frictionally, and by manipulating the lever the operator may then control the movement of the shock as desired.

What I claim as being my invention, and desire to secure by Letters Patent, is

1. Inahoisting mechanism, the combination of a winding-drum rotatably mounted upon a fixed support, a lever mounted coaxially with said drum and having operative connection therewith to rotate it in one direction, said connection being automatically released when said lever has reached a predetermined limit, and a brake mechanism operative to prevent rotation of said drum, said brake mechanism being actuated by said lever after it h as passed said predetermined limit.

2. In a hoisting mechanism, the combination of a winding-drum rotatably mounted upon a fixed support, a lever coaxially mounted with said drum and having operative connection therewith to rotate itin one direction, said connection being automatically released when said lever has reached a predetermined limit, and a brake mechanism operative to prevent rotation of said drum comprising a pawl pivotally mounted on said fixed support and adapted to positively lock said drum against rotation in an opposite direction, a frictionshoe forming part of said pawl and adapted to engage with said drum when said pawl is released, said pawl being released by said lever after it has passed said predetermined limit.

3. In a hoisting mechanism, the combination of a winding-drum rotatably mounted upon a fixed support and having a ratchet-wheel connected therewith, a lever pivoted upon the axis of the drum, a pawl pivotally mounted on said lever and adapted to engage with said ratchet-wheel when the lever is moved in one direction, means for disengaging said pawl when the lever has reached a predetermined limit, a pawl pivotally mounted on the fixed support and adapted to engage with the ratchet-wheel when the lever is moved in an opposite direction, a toe-piece on said lever adapted to contact with said second-named pawl and disengage it when said lever has reached its predetermined limit, and a brakeshoe forming part of said pawl and adapted to be frictionally engaged with said ratchetlwheel when said lever passes beyond said innit.

4:. In ahoisting mechanism, the combination of a winding-d rum rotatably mounted upon a fixed support and having a ratchet-wheel forming a part thereof, a lever pivoted upon the axis of the drum, a pawl pivotally mounted on said lever and adapted to engage with said ratchet-wheel when the lever is moved in one direction, means for disengaging said pawl when the lever has reached a predetermined limit comprising an ear on the fixed support shoe forming part of said pawl and adapted to be frictionally engaged with said ratchetwheel when said lever passes beyond said limit.

5. In ahoisting mechanism, the combination of a winding-drum rotatably mounted upon a fixed support and havinga ratchet-wheel forming a part thereof, a lever pivoted upon the axis of the drum, a pawl pivotally mounted on said lever and adapted to engage with said ratchet-wheel when the lever is moved in one direction, means for disengaging said pawl when the lever has reached a predetermined limit, a pawl pivotally monnted'on the fixed support and adapted to engage with the ratchet-wheel when the lever is moved in an opposite direction, a toe-piece on said lever adapted to contact with said second-named pawl and disengage it when said lever has reached its predetermined limit, and a brakeshoe forming part of said pawl and adapted to frictionally engage with the inner surface of the rim of said ratchet-wheel when said lever passes beyond said limit.

In witness whereof 1 hereto affix my signature in presence of two witnesses.

DANIEL W. SMITH.

' Witnesses:

A. M. CHRISTIAN, G. W. HENDERSON.