US326504A - James a - Google Patents

Description

(No Model.)

J.A.HURLEY.

BRAKE MECHANISM FOR ELEVATORS.

Patented Sept. 15, 1885.

N. PETERS. PhuXo-U'hogrzpher, Washingion. D. C.

UNITED STATES PATENT rrrcn.

JAMES A. HURLEY, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO EDWVIN A. WHITE, OF SAME PLACE.

BRAKE MECHANISM FOR ELEVATORS.

SPECIFIGATION forming part of Letters Patent No. 326,504, dated September 15. 1885.

Applieation'filed July 25, 1885. (No model.)

To all whom it may concern.-

Be it known that I, JAMES A. HURLEY, of Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Brake Mechanism for Elevators, of which the following description, in connection with the accompanying drawings, is a specification,like letters on the drawings representing like parts.

IO This invention is an improvement upon Letters Patent of the United States No. 214,539, granted April 22, 1879, and has for its object to produce a brake mechanism for elevatorwheels which shall be positive in operation and cheap and simple to construct.

This invention consists, essentially, of a power-wheel combined with a brake-shoepivoted eccentrically to the said power-wheel, a weighted leverto move the said brake-shoe on its pivot, and an auxiliary brake-shoe pivoted to any suitable frame-work and connected with the weighted lever by a connecting-rod,whereby the brake-sh oes are moved simultaneously, all as will be hereinafter more fully set forth.

Figure 1 represents, in side elevation, a brake mechanism constructed in accordance with this invention and applied to a powerwheel of an elevator, and Fig. 2 a top view thereof.

The shaft A, supported in any usual bearings, carries a gear-wheel, B, which may actuate any usual drum over which a rope may be passed to sustain a load. The said shaft A also carries a power-wheel, A, having its periphery grooved to receive the usual endless rope or chain,a, and is also provided with a flat surface against which the brake-shoe may bind,all as in the said patent referred to, so need not be herein further described.

The main brake-shoe b having a curved face, I), faced with leather or other yielding material, is pivoted upon a shaft, 2, placed eccentrically to the power-wheel A, said shaft 2 having bearings in the frame-work. The 5 brake-shoe b is moved on its pivot in one direction by a Weighted lever, c, rigidly conneeted therewith, which in turn is raised by a hand cord or chain, c, passing over a pulley, 0 having. bearings in the frame-work, said cord or chain thence passing downward to be at all times accessible to the operator.

An auxiliary brake-shoe, d, constructed similarly to the brake-shoe Z), is suspended from a shaft, 3, also having bearings in the frame-work, and is arranged to bind against the power-wheel nearly opposite the brakeshoe 1). The lower end of the auxiliary brakeshoe (2 is connected with the weighted lever c, as at d, by a connecting-rod, (i by which to move it.

Normally, the cord 0 being loose and the wheel being turned in the direction of the arrow 4 for hoisting,the parts remain as in fullline position, Fig. 1, the lower end of thebrake-shoe I) just touching the periphery of 6 the power-wheel, while the auxiliary brakeshoe d is removed from contact therewith, such position permitting the power-wheel A to rotate in the direction of the arrow etas the operator pulls upon the rope a to raise the load.

Should it incidentally be desired to stop the load, the operator releases his grasp upon the rope a, the power-wheel A reverses its rotation by reason of the weight of the load,caus- 7 5 ing the eccentrically-pivoted brake-shoe b to immediately bind upon the periphery of the power-wheel, thus automatically stopping its back ward rotation.

To lower a loaded car suspended by a rope or chain from the shaft or drum A, the operator from his position on any floor will pull upon the cord a, raise the weighted lever c, and draw the eccentricallypivoted brakeshoe 1) away from contact with the periphery of the power-wheel A, and the wheel will commence to turn in the direction opposite the arrow 4, such movement drawing the brake toward but not against the powerwheel A.

WVhen the lever c has been sufficiently raised to lie in a direct line with the arrow 5, Fig. 1, both brake-shoes are removed from contact with the power-wheel, thus permitting it to rotate freely in either direction; but by raising the lever c a little farther, as into the dotted-line position, Fig. 1, the brake-shoe d is brought in direct contact with the powerwheel, checking its rotation.

Thus it will be seen that an operator can very soon become skilled to carry his load at any desired speed with safety, and check it either by the cord or automatically.

The lever 0 has on it an adjustable weight, 0, which acts as a counter-balance for the rope 0.

I claim- 1. Thepower-wheel A, combined with a brake-shoe, b, pivoted eccentrically to the axis of the shaftof the said wheel to automatically check the rotation of the powerwheel in one direction, substantially as described.

2. The power-wheel A and the eccentrically-pivoted brake-shoe, combined with a lever connected with the said brake-shoe,substantiall y as described.

JAMES A. HURLEY.

WVitnesses:

G. W. GREGORY, B. J. NoYns.

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