US623663A - William hay - Google Patents

Description

Pafented Apr. 25, I899.

W. HAY. SAFETY ELEVATOR BRAKE.

(Applicatien filed Feb. 5, 1698.)

(Model.)

24 /WSW j Z. 75W

ATTORNEYJ Uivrrnn STATES WV'ILLIAM HAY, OF NEWV YORK, N. Y,

SAFETY ELEVATOR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 623,663, dated April 25, 1899.

Application filed February 5, 1898. erial No. 669,219. (ModeL) T0 ctZZ whom, it may concern.-

lfie it known that I, ILLIAM HAY, a subject of the Queen of Great Britain, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Safety Elevator-Brakes, of which the following is a full and complete specification, such as will enable those skilled in the art to which it appertainsto make and use the same.

This invention relates to safety elevatorbrakes; and it has for its object to provide a simple and improved brake mechanism which will normally operate as the guide-rack and guide devices for the side of the car, but which will instantly and automatically perform its function as a brake when the weight of the car is received upon said brake mechanism either through the release of the car from suspension by breaking of its suspendingcables or from any other cause.

The invention is fully disclosed in the following specification, of which the accompanying drawings form a part, in which the separate parts of my improvement aredesignated by the same letters of reference in each of the views, and in which- Figure 1 is a side view showingan elevator provided with my improved safety-brake and guide mechanism, the car and mechanism being in normal suspended condition. Fig. 2 is a side view taken on a plane at right angles to Fig. l and showing the brake mechanism in operative position with the car released from suspension. Fig. 3 is a detail inverted plan view, partly in section, showing the brake devices; and Fig. 4 is a detail side view of the worm-wheel. I

Referring to the drawings, A designates the elevator-car, which is suspended by the usual rope or cables at and is adapted to travel between the vertical guide-bars B B, plates or shoes to being provided upon the car for the engagement of said guide-bars.

In carrying out my invention the guide-bars B are formed by a worm-gear rack-bar having its teeth Z) inclined with respect to the horizontal plane of the car. The worm-gear rack bar is engaged by a worm-wheel G, mounted in horizontal position upon the bottom of the elevator-car. This worm-wheel is preferably carried in a suitable bracket, as at d, in which it is loosely mounted, so that a degree of play vertically is permitted. The worm-wheel is preferably loosely carried by a vertical shaft 6, arranged in the bracket (Z. The relative construction and arrangement are such that when the car is in normal suspended position and traveling either upwardly or downwardly the weight of the car will be entirely carried by its suspending media and no weight will be carried by the loosely-mounted worm-wheel O. The latter will therefore revolve freely in the worm-gear rack-bar B, and by reason of its loose mounting upon its shaft 6 and the degree of vertical play permitted in the bracket 01 it will not retard the motion of the car in either direction; butwhen the car is released from suspension by breaking of the suspending rope or cable, or for any other reason the weight of the car rests upon the worm wheel 0, the latter will bind between the teeth of the rack-bar and the bottom of the car and cannot turn, so that it is locked in firm engagement with the rack-bar and sustains the car in fixed position. The upper part of the bracket 61 forms a bearing-surface or stop, against which the top surface of the worm-wheel G will bear in the brake operation just described, and which also limits the upward movement of said wheel, while the lower part of said bracket forms a-stop to limit the downward movement of said wheel.

In the ordinary movement of the elevatorcar the car and the worm-gear will move at uniform speeds, and consequently the car will not be retarded in its movement by the wormgear. In the case of a certain increase in the velocity of the car, however, the worm-gear will of course by reason ofits inertia fail to move immediately atthe same velocity, and consequently will be brought in contact with the bracket directly beneath the floor of the car. This will exert abraking action on the worm-gear and stop its movement. The wormgear will consequently, together with the rackbar, serve as a brake and will stop or support the car, and the car will also at this time be still further supported by the slight tipping TOO occasioned by its being supported at one side only.

IIaving fully described my inven tion, I claim as new and desire to secure by Letters Patent 1. An improved safety elevator-brake, comprising a vertical worm-gearrack-bar extending the length of the elevator-shaft at one side thereof, an elevatorcar, a stationary shaft on the bottom of said car, and at one side thereof, a worm-gear loosely mounted on said shaft and adapted to have vertical movement thereon, and also to mesh with said rack-bar and stops which limit the movement of said wormgear in both directions of its vertical movement, substantially as shown and described.

2. The combination with an elevator-car, of a bracket. or support secured to the bottom thereof near one side thereof, a vertical shaft mounted-in said bracket or support, a wormgear mounted on said shaft and adapted to move vertically thereon within certain limits, the vertical movement of said worm-gear being limited by the top and bottom of said bracket or support, and a stationary vertical worm-gear rack-bar adjacent to the said side of said car in connection with which the said worm-gear operates, substantially as shown and described.

3. Theherein-d escribed brake for elevatorcars, comprising the combination with a car, of a suitably-supported vertical shaft secured to the bottom of the car adjacent to one side thereof, a worm-gear mounted on said shaft and adapted to move vertically thereon within certain limits, and a stationary Worm-gear rack-bar supported adjacent to said side of the elevator-carand in connection with which

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