US78829A - Improvement in hoisting-machines - Google Patents

Description

ZUNITED, STATES EENEY J, EEEDY, 0E CINCINNATI, oEIo'.

IMPRovEMENT lN'HolpsTlNG-MACHINES;

Specification formingpart of Letters Patent No. 78,829, `dated June 9, 1868.

To all whom t mor/y concern:

Be it known thatI, HENRY J. REEDY, ofv

Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Hoisting-Machines; and do hereby declare thefollowing to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specication.

My invention consists in supporting the platform of a hoisting-machine upon the midlength of a single rope, .whose two ends, after lpassing upward and over the two sheaves, are

stanchions placed at two opposite sides of theV same, and these stanchions support at their upper ends a staging, C, in which are journaled the different hoisting devices, which will be hereafter described.

D represents the platform, which is supported upon a stout rope, E, at or near the mid-length of the latter, and the two ends of this rope, after being passed upward and over the sheaves F F on the shaft Gr, are attached to weights H H', which serve' to counterbalance the platform. In order to prevent the hoisting-rope E, being frayed out by chang against the bottom edges of the platform, I attach thereto small rollers d, upon which the rope constantly presses.

The platform has attached toits sides stiles I I', whose upper ends are united to the beam J, and said stiles are provided with lugs i i', which traverse the ridges b b of the stanchions, and thereby confine the platform to a vertical path. The counter-balances are guided by the tongues f f', which play within the grooves k k of the vertical postsK K. The shaft G, to

which the winding-drum is usually secured, has'attached to one end of ita Yspur-wheel, L, which gears with a pinion, M, on the shaft N, and said shaft N carries the main sheavewheel Q, around which passes the customary endless rope, by which the hoisting devices are operated.

In order to arrest the ascent or descent of the platform at any part of the building, and to maintain it securely in position, l provide a brake, which is operated in the following manner: Placed under the shaft N, and parallel therewith, is another shaft, P, which has keyed to it a ratchet-wheel, R, spring-rubber S, and lever T, the latter having attached to its free end a cord, t, by which it is operated. U is a pawl, adapted to engage with the teeth of ratchet-wheel E, and this pawl is pivoted to the stanchion B', and one end of said pawl is furnished with a counter-weight, V, while the other end has secured to it a rope, a.

Whenever it is desired to arrest the progress of the platform the cord t is pulled by the operator, so as to cause the spring-rubber S to press against the periphery of the main sheave O, which instantly checks the rotation of the latter and its accompanying elevating devices, and by drawing down on the rope u the pawl U is engaged with the teeth of the ratchetwheel R, so as to lock it, and when the brake is in this condition the platform can be safely maintained at any position'for an indefinite length of time.

By exerting a slight degree of force upon the rope t the spring-rubber S will yield a sufcient distance to permit of the counter-balance V raising the pawl U, so as to disengage the latter from. the teeth of the ratchet-wheel B, which act unlocks the brake and leaves the platform at liberty to be raised or lowered.

It will be seen that the rope which carries the platform also supports the counter-balances, thereby dispensing with a number of additional ropes and pulleys, and the extra amount of friction arising from the use ofthe same. It will also be seen that my hoistingmachine has no drum for the rope to wind upon, and therefore there is no danger of the coils of rope crowding and riding upon one another. As the hoisting-rope is carried around the rollers on the under side of the platform, it is ob= 2 l 7S, S29

vious that if there should be any greater strain upon any one end of the rope, it is immediately compensated for, and there is, consequently, an equal stress on both sides of the platform; but, if preferred, each side of the platform may be suspended from different ropes. f

For small hoisting-machines, dumb-waiters, 85o., a single counter-balance, sheave, and rope may be employed, the latter being attached to the mid-length of the beam J.

Hoisting-machines which I have constructed,

y and which are now in daily use, have frequently elevated one and a half tous, and without any slipping Whatever, although the counterweights H H' only Weigh one hundred and fifty pounds each, and the sheaves F F are Vnot more than fourteen inches in diameter.

. I claim herein as new and of my inventionl. The combination, substantially as described, With a hoisting-platform, of the suspending-rope E, Weights H H', rollers d, sheaves F F', and shaft G, or their mechanical equivalents, by which the platform is both balanced and enabled to be elevated and depressed, in the manner explained.

2. The arrangement, substantially as described, of the shaft P, ratchet-Wheel R, rubber S, lever T, and pawl U V, or their mechanical equivalents, for the purpose set forth.

In testimony of which invention I hereunto set my hand.

HENRY J. -REEDY. Witnesses: A

Gao. H. KNIGHT, JAMES H. LAYMAN.

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