US247075A - Power-driven hoisting-machine - Google Patents

Description

(No Model.)

H. B. LARZELERE.

POWER DRIVEN HOISTING MACHINE.

No.24'71075. Patented Sept. 13, 1.881.

FIG-Z.

, UNITED STATES PATENT OFFI E,

HENRY B. LARZELERE, OF DOYLESTOWN PENNSYLVANIA.

POWER-DRIVEN HOlSTlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 247,075, dated September 13, 1881.

Application filed J nly 18', 1881. (No model.)

To all whom it may concern Be it known that I, HENRY B. LARZELERE, a citizen of the United States,residingin Doylestown, Bucks county, Pennsylvania, have invented an Im provemen tin Po werD riven Hoisting-Machines, of which the following is a specification.

My invention relates to an improvement in devices for startingand stopping power-driven hoisting-machines; and the object of my invention is to simplify the construction and operation and cheapen the cost of a device of this character. This object I attain in the manner which I will now proceed to describe, reference being had to the accompanying drawings, in which Figure 1 is a side view of the driving mechanism of the hoist, showing my improved stopping and starting device; and Fig. 2, a plan view of the same. i

A is a frame-work, to suitable bearings on the top of which are adapted shafts B and D, which are geared together by a cog-wheel, a, and pinion b, the shaft B carrying the hoisting-drum E, and the shaft D being furnished 4 with a pulley, F, and brake-wheel G, preferably cast in one piece. A hanger below the frame A is provided with bearings for a shaft, d,'which is suitably driven, and carries apulley, H, a belt, 6, passing round the latter and round the pulley F on the shaft D. The belt 0 is so loose that it fails to transmit motion from the pulley H to the pulley F except when tightened, as described hereinafter.

Hung to one of the beams of the frame A by a pin, f, is a lever, J, having three arms, 9, m, and n, the arm g having a weight, h, the arm m carrying a pivoted brake-shoe, t', and the arm n being forked at the end and provided with a roller, w.

The hoisting-rope a: passes from the drum E round suitable supporting-pulleys to the place where the hoisting is to be done, and a smaller rope, y, is connected to the outer end of the arm 9 of the lever J, and is conducted to the same spot as the rope at, so as to be within easy reach of the person operating the hoist.

The driving-pulley H turns in the direction of the arrow, and when it is desired to elevate the load the rope y is pulled so as to raise the outer end of the arm 9 of the lever J, the ef-.

fect of this movement being to move the arm m and its shoe i away from the surface of the wheel G, and to cause the roller w of the arm n to press against the belt 0 and tighten the same, as shown in Fig. 1, the motion of the pulley H being thereby transmitted to the pulley F and shaft D, and thence through the gearing a b to the shaft B and drum E, which is caused to turn in the direction of the arrow, so as to wind up the rope. When the load has reached the proper elevation and it is desired to stop the hoist the rope y is slackened, and the arm 9 of the lever J, under the influence of the weight h, is depressed to such an extent that the roller w is retracted and the belt- 6 loosened, so as to fail to transmit power from the pulley H to the pulley F, the brake-shoet' at the same time being pressed against the periphery of the brake-wheel G, so as to stop the revolution of the same, and consequently of the hoisting-drum. When it is desired to lower the load a slight pull upon the rope y suffices to effect such an operation of the lever J as to release the wheel G from the control of the brake-shoe t withouttightening the belt 0 to such an extent as to cause the transmission of power thereby, so that the drum E is free to turn backward, in order to permit the unwinding of the rope or therefrom.

I am aware that a governing-cord has heretofore been combined with devices for tightening the belt of and applying a brake to powerdriven hoisting vmechanism; but such devices have hitherto been-of a more complicated and expensive character than those forming the subject of my invention, and are more liable to get out of order.

In carrying out my invention the arm m of the lever J may be dispensed with, the friction shoe t being hung to the arm 9, and adapted to act upon the inner face of the brake-wheel flange, as shown by dotted lines in Fig.1; and the pulley F and brake-wheelGmay,if desired, be secured directly to the drum-shaft B, instead of to a counter-shaft, D, as shown in the drawings. Thelatterconstrnctionispreferred, however, as it permits the use of gearing whereby the powerof the hoisting-drum is increased.

The counter-shaft D may also be utilized as a means of hanging the lever J, instead of using'a pin, f, for this purpose, the construction of the lever in such case being modified as its new location requires.

I claim as my invention- The combination, in power-driven hoisting and on another arm a friction-shoe, i, as set [0 forth.

In testimony whereofl have signed my name to this specification in the presence oftwo sub- 5 apparatus, of the drum E and its rope or, the scribing Witnesses.

pulleys F and H, the connecting-belt e, the brake-wheel G, the governing-rope y, and the weighted lever J, connected to said rope and having on one arm a belt-tightening whee], w,

HENRY B. LARZELERE. Witnesses:

WM. STUCKERT, LEVI L. JAMES.

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