US857551A - Compound brake. - Google Patents

Description

I No. 857,551.

J. DILLON.

COMPOUND BRAKE. .APPL-IOATION run!) 001s, 190s.

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PATENTED JUNE 18, 1907.

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UNITED STATES PATENT OFFICE.

JOHN DILLON, OF MIINVAUKEE, WISCONSIN, ASSIGN OR TO OTIS ELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented June 18, 1907.

Original application filed March 22, 1906, Serial No. 307,884. Divided and this application filed October 3, 1906. Serial No. 337,257.

To ttZZ whom, it may concern:

Be it known that I, J OHN DILLON, a citizen of the United States, residing in Milwaukee, in the State of Wisconsin, have invented a new and useful Improvement in Compound Brakes, of which the following is a specification.

My invention relates to elevators, and is a division of my co-pending a plication, No. 307,384, filed March 22, 1906, for an improvement in compound brakes.

One of the objects of my invention is the provision of improved mechanical means for releasing an emergency brake after it has been set automatically or otherwise.

Another object of my invention is the provision of improved mechanical means for re leasing an emergency brake from the car after the same has been applied automatically to prevent the over-running of an elevator car at terminal landings.

A further object of the present invention is to provide in combination with means for automatically applying a brake to a motor after the latter has made a predetermined number of revolutions, a toggle connected to a single lever, and means for breaking said toggle to effect the release of the brake.

Other objects of the invention will appear hereinafter, the novel combinations of elements being pointed out in the claims.

Figure 1 shows an elevation of a hoisting device with my invention applied thereto; and Fig. 2 is a side elevation of the hoisting apparatus, with the details of my invention illustrated.

In the accompanying drawings, A designates the brake pulley of the elevator apparatus which may be operated by an electric motor M as shown, or by any other kind of, a motor which may be controlled preferably from within the car. It will be obvious, however, that my invention will be equally ada ted to such elevator devices as are control ed from a stationary position instead of from within the car. The ordinary brake which is applied each time the car is stopped at an intermediate landing is omitted from the drawings for the reason that it is well known in the art and forms no part of the present invention.

A portion of the cable drum shaft B is screw-threaded and carries the clutch nuts D, D, which are adjustable on said shaft, but

secured thereto in adjusted position, at a distance from each other proportional to the distance between the terminals for the elevator car. A traveling clutch nut O is loose on the screw-threaded shaft B but is limited to a longitudinal movement by reason of the shank b which is secured thereto and placed in the longitudinally slotted web d connecting a cam E, and the pulley E loose on the drum shaft. At about the time the elevator car arrives at either terminal, oneof the clutches of the clutch-nut O engages one of the fixed nuts D to impart rotary motion to said cam and pulley against suitable yielding resistance, as for example, the weight F connected to the aforesaid pulley by the sheavesupported flexible device 6, this being one form of such resistance. The cam E comprises an endless groove g, of peculiar sha e to secure the desired operation of tlie emergency brake. This groove is engaged by the lug or roller f at one end of the actuating lever G.

The actuating lever G is pivoted at g to toggle mechanism N which is so arranged that its pivotal point p is in substantial alinement with the pivotal point N and the fulcrum g. The latch L is normally held between the stops S, S, and the spring 1) is so arranged that it will pull the point p to the right when the rope R is actuated to lift the latch L out of engagement with its stops. The spring 19 is comiected between the toggle mechanism and the fixed point a which may be on the outer end of a bracket Z rigid with the gear casing O.

When the car goes beyond a predetermined limit of travel the cam E will move the point f of the actuating lever G upwardly and consequently the brake lever I of the brake mechanism downwardly, to positively apply thebrake shoes J, J, to the brake pulley A. It will, therefore, be seen that the fulcrum point g is fixed at this time. In order to prevent the actuating lever G from having a longitudinal movement, a shoulder K is provided for the right-hand end of the lever G, as viewed in Fig. 2, and the extension T of such lever is provided with a collar V. The point T passes through the outer end of the brake lever I so that the latter will abut against the shoulder K on one side and the collar V on the other. Any other suitable means for preventing longitudinal movement of the actuating lever G so as to prevent the latter from losing its correct position with reference to the point f in the cam, and also with reference to the fulcrum g, may be used. When the rope R is now pulled upwardly so as to release the latch L from the stops S, S, the spring p will break the toggle N and destroy the fulcrum g. Furthermore, the spring 1) lifts the righthand end of the actuating lever G and consequently also the brake-lever I, thus releasing the emergency brake so that the car may be operated in the opposite direction. If desired, the positions of the spring p and the latch L may be interchanged.

It should be particularly noted that the actuating lever G is connected directly to the toggle mechanism and not through an additional lever as disclosed in my co-pending application hereinbefore referred to, and in my co-pending application, Serial No. 337,256, filed October 3, 1906, for an improvement in compound brakes. In other words, but a single actuating lever G is employed for applying the brake and for releasing the same upon the breaking of the toggle mechanism. Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the principles of my invention, and I desire therefore not to be limited to the exact construction herein disclosed.

What I claim as my invention is 1. In an elevator, the combination with a hoist, of brake mechanism, a single actuating-lever, means for normally holding the fulcrum of said lever stationary, and a device for operating said holding means to free the fulcrum and release the brake.

2. In an elevator, the combination with a hoist, of automatic stop-motion apparatus therefor, brake mechanism, a single actuating lever connected between said stop-motion apparatus and said brake mechanism,

means for normally holding the fulcrum of said lever stationary, and a device for operating said holding means to free the fulcrum and release the brake.

3. In an elevator, the combination with a hoist, of a cam connected thereto, brake mechanism, a single actuating lever connecting the cam and brake mechanism, and toggle mechanism connected to said lever.

4. In an elevator, the combination with hoisting apparatus, of brake mechanism, a single actuating device, stop-motion mechanism operated by the hoisting apparatus when the car moves beyond predetermined limits of travel, to positively apply the brake, a toggle connected to said actuating device, means for holding the toggle stationary, means for releasing the toggle, and a spring for moving the toggle and an actuating device to release the brake when said toggle-releasing means is actuated.

5. In an elevator, the combination with hoisting apparatus, of brake mechanism, stop-motion mechanism operated by the hoisting apparatus, a toggle, a spring connected to said toggle, and tending to pull the same in a predetermined direction, a latch and stops for holding said toggle in a predetermined position against the action of said spring, a single actuating lever connected at its ends, respectively, to the stop-motion mechanism and to said brake mechanism, and fulcrumed at an intermediate point to said toggle, and a rope connected to said latch to release the latter and permit said spring to break the toggle and move the brake-lever to release the brake.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN DILLON.

WVitnesses:

H. H. MEIXsELL, A. F. J UPP.

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