US276052A - Michael j - Google Patents

Description

Patented Apr. 17,1883.

r. Waahinginn, D c.

NITED STATES PATENT OFFICE.

MICHAEL J. LAWLOR, OF POUGHK-EEPSI'E, NEW YORK.

BRAKE FDR ELEVATORS AND DUMB-WAITERS.

SPECIFICATION forming part of Letters Patent No. 276,052, dated April 17, 1883.

Application filed January 6, 1888. (No model.)

To all whom it may concern:

Be it known that I, MICHAEL J. LAWLOR, a citizen of the United States, residing at Poughkeepsie, in the county of Dutchess and State of New York, have invented a new and useful Brake for Elevators and Dumb-Wait ers, of which the following is a specification.

My invention relates to improvements in brakes applicable to dumb-waiters and all elevators that are operated by an endless rope and wheel. The object that I attain is the stopping and holding firmly the hoist-wheel of any elevator or dumb-waiter by the automatic action of two brake-levers upon the rim of said wheel. This object is attained by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a front view of my brake as it appears while the wheel B is being operated by the rope A A. Fig. 2 shows the brakeljever detached from the waiter. Fig. 3 shows 'the standards which sustain the brake-levers form and under the outer edge of the hoistwheel on each side, as shown, Fig. 1. The

brake-levers G O, suspended on the pivots K K,'swing freely in the plane of the hoist-wheel,

iand at their lower ends embrace the hoist-rope A A, which passes though them over the friction-wheel D D, as shown, Fig. 1. To the upper arm of one of the brake-levers is attached an arm, H, extending in front and nearly in the same plane as the hoist-wheel, upon which arm the adjustable weight G is secured in proper position by a thumb-screw or other equivalent device. This weight G automatically sets the brake to which it is attached against the rimof the hoist-wheel. The rod I I, adjusted by the universal screw J, creates a corresponding action in the other brake-lever, and when the brakes are set the lower ends of the brake-levers deflect outward each of the hoist-ropes at their points of contact. The amount of such deflection maybe greater as the depth of the well increases. The hoistrope, being endless, passes through slots in the platform-plank M, so as to allow each side thereof to swing freely in their plane on each side of the wheel B. By applying downward force to either side of the hoist-rope A A it acts first upon the lower arm of the brake-lever, pressing it inward and disengaging both brakes by the mechanism already described, and the hoist-wheel freely obeys its rope, and the moment the force ceases upon the rope the brakes are set by the automatic action of the weight G, above described.

The ends of the levers U G, at the points E E, may be shod with wood or leather, or other equivalent material, so as to prevent noise, and by replacing such shoe when worn out uniform action may be secured, and one shoe may be left out in case one arm of the lever is sufficient to hold the wheel.

I am aware of the patent granted to George W. Cannon. of Poughkeepsie, New York, No. 269,776, and it will be seen that I accomplish the same object that he seeks more effectually and by far simpler mechanism, easier of operation, less wear and tear on the hoist-rope and machinery, anddispense with all pulleys, and hold the hoist-wheel from movingin either direction. It will also be observed that I take action directly from hoist-rope, as it naturally falls from the wheel, to disengage the brakes.

Having thus described my invention, its object and manner of operation, mode of construction, application, and use, what I claim, and desire to obtain Letters Patent for, is-- The combination and arrangement of the brake -levers 0 O, the standards F F, the weight G, the connecting-rod I 1, turn-buckle J, with the endless hoist-rope A, and hoistwheel B, substantially as set forth.

MICHAEL J. LAWLOR.

Witnesses:

ARNONT CANNON, J r., KIERAN J. 'LAWLOR.-

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