US857549A

US857549A - Compound brake.

Info

Publication number: US857549A
Application number: US30733406A
Authority: US
Inventors: John Dillon
Original assignee: Otis Elevator Co
Current assignee: Otis Elevator Co
Priority date: 1906-03-22
Filing date: 1906-03-22
Publication date: 1907-06-18
Anticipated expiration: 1924-06-18

Description

PATENTED JUNE 18, 1907.

J. DILLON. COMPOUND BRAKE. APPLIOATIOH FILED HA3. 2:. 1906.

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PATENTED JUNE 1a, 1907.

J. DILLON.

COMPOUND BRAKE. ArPLIo'ATmN FILED M11122. 1906.

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UNITED STATES PATENT OFFIOE.

JOHN DILLON, OF MIL VAUKEE YVISCONSIN, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO OTIS ELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

.COIVIPOUND BRAKE.

Specification of Letters Patent.

Patented June 18, 1907.

Application filed March 22,1906- Serial No. 307,334.

To all whom, it may concern:

Be it known that I, JOHN DILLON, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and 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 an improvement in the patent granted to me October 17, 1905, 802,074, for an elevator mechanism.

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 obj ect of my invention is the provision of improved mechanical means for releasing 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 preventing over-running of an elevator car at terminal landings by the automatic application of an emergency brake, a toggle which may be broken at will to effect the release of such emergency brake.

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

Figure I shows an elevation of a hoisting device with my invention applied thereto; this view being taken partly in section on the line 2-2, of Fig. 2 Fig. 2 is a side elevation of the hoisting apparatus, the left-hand portion of which is shown in end view in Fig. l Fig. 3 is a detail view of my invention; Fig. 4 is a view similar to Fig. 3 but showing the position of the parts when the emergency brake is applied; Fig. 5 is a view similar to Fig. 4 but showing the positions of the parts when the brake is released; Fig. 6 illustrates a slight modification of Fig. 3; and Fig. 7 shows a further modification.

Referring to Figs. 1. and 2, A designates the brake pulley of the elevator apparatus which may be operated by an electric motor 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 adapted to such elevator devices as are controlled from a stationary position instead of from within the car. The ordinary brake which is ap plied 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 terminal landings 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 I) which is secured thereto, and placed in the longitudinally slotted web (Z connecting the cam E and the pulley E, loose on the drum shaft. At about the time the elevator car arrives at either terminal landing, one of the clutches of the clutch-nut C 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 sheave-supported. flexible device (2, this being one form of such resistance. The cam E comprises an endless groove of peculiar shape to secure the desired operation of the emergency brake. This groove is engaged by the lug or roller f at one end of the lever G. The lever II is pivotally connected at g with the lever G, and one end of said lever II is shown in Fig. 2 pivotally connected with the frame of the hoisting apparatus.

The lever I in connection with the lever G, has toggle connection with the friction shoes J which are adapted to be applied to the brake pulley A. These shoes and the mechanism in connection therewith, constitute an emergency brake.

The left-hand end of the lever H, as viewed in Figs. 2 to 6 inclusive, is pivotally connected to a toggle N, the upper end of which is connected to the bracket N secured to the gear casing O of the elevator apparatus. As shown in Fig. 3, the central point p of the toggle is normally held slightly to the left or so that the toggle will be almost vertical. This is accomplished by means of the spring P which tends to move the toggle N to the left to break the same, but is prevented from doi sion. I have, in this instance, shown a ing so by the latch L which engages the stoprods S, S. These stop-rods may be secured to the gear casing as shown in Fig. 1, if desired. Connected to the latch L is a rope R which may pass to the elevator car so that when the operator in the car pulls up on the rope, the latch L will be dis-engaged from the stops S, S, and the spring P will move the toggle into the position shown in Fig. 5. The rope It may of course extend to any other point and the latch L therefore operated from any desired position, preferably that where the manual controlling device is placed.

When the operator of the elevator fails to effect the stopping of the elevator motor when the car approaches a terminal landing, the traveling clutch nuts D and C cause rotary motion of the cam E. At this time the points y and h are held stationary, and consequently also the lever H. This provides a fixed fulcrum at g for the lever G, and therefore, as the cam E revolves, the point f at the outer end of the lever G is moved upwardly and the brake-rod or lever I positively applies the emergency brake to stop the elevator mechanism and prevent the elevator car from running too far beyond its terminal landings. After the emergency brake has been thus applied as indicated in Fig. 4, the ordinary brake may also be applied by the operator moving his switch to central, position in the well known manner. But it will be evident that the emergency brake must be released before the car can be started in the opposite direction. This I accomplish in this instance by a device which is entirely mechanical and comprises the spring P, latch L, and the toggle N, in addition to some means, as for example, a rope R for operating the latch L. hen it is therefore desired to release the brake, the rope R is pulled upwardly so as to release the latch L from the stop-rods S, S when the spring P will act to pull the point p of the toggle to the left as indicated in Fig. 5. The point g which has hitherto been fixed, is now moved upwardly and so also the pivotal point 9 and consequently the lever G. This will have the effect of lifting the brake lever I and moving the shoes J, J out of engagement with the brake pulleys A as is evident from an inspection of Figs. 1 & 2. The elevator car may now start, and in doing so the weight F through its flexible connection 6 will move the cam E to its original position, that is, to the position indicated in Fig. 3. This action, however, will not reset or replace the toggle and latch to its original position, and this must therefore be done manually. In order to provide for an automatic resetting of the toggle, I have shown a modification in Fig. 6 wherein one of the arms of the toggle is ex tended to form a bell crank lever with a weight or a spring attached to such extenweight W which may be adjusted on the extension X. Normally a plate or yoke Z which is connected pivotally to the middle point p of the toggle, rests against the fixed stop Y, being held in such position by the weight W.

When the car approaches a terminal landing, the cam E will be operated to the position indicated in Fig. 4, to positively apply the emergency brake and thus stop the elevator apparatus. Now, when it is desired to release the emergency brake so that the car can be operated in the opposite direction, the rope It is pulled upwardly against the action of the weight W and the toggle P so that the latter will be broken, and the fixed fulcrum g changed to a floating fulcrum. That is, when the point p of the toggle N is moved to the right, the lever H is no longer fixed and the strain on the latter, due to the operation of the lever G on the fulcrum g, is removed, and consequently, the emergency brake will be released. With the construction shown in Fig. 5, the spring P may lift the point y and the fulcrum g sufficiently to actually move the brake-shoes out of engagement with the brake pulley A. In Fig. 6 it is evident that when the rope R is first pulled upwardly, the tendency would be to at first positively apply the brake to a greater extent, but after the point 3) passes a line drawn through the points N and y the lever II of the brake lever I will be lifted so as to positively move the brake shoes J, J away from the pulley rim.

In Fig. 7 I have illustrated another modification in which the lever H is omitted. In this case a toggle N is so arranged that its pivotal point p is in substantial alinement with the outer end of the bracket N and the fulcrum g. The latch L is normally held between the stops S, S, and the spring P is so arranged that it will pull the point p to the right when the rope It is actuated to lift the latch L out of engagement with its stops.

WVhen the car approaches its terminal landing, the cam E will move the point f of the lever G upwardly, and consequently the brake lever I downwardly, to positively apply the brake-shoes of the emergency brake. It will therefore be seen that the fulcrum point g is fixed at this time. In order to prevent the lever G from having a longitudinal movement, a shoulder K is provided for the righthand end of the lever G as viewed in Fig. 7, and the extension T of such lever is provided with a collar V. The part 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 side. Any other suitable means for preventing longitudinal movement of the 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 P lifts the righthand end of the 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. This may also be done in Figs. 3, 4, and 5 if desired. In Fig. 6, corresponding parts may be changed in a similar manner.

Although I have herein shown only one form of my invention with slight modifications thereof, it is obvious that various changes in the details and arrangement of parts may be made by those skilled in the art without departing from the principles of my invention, and I therefore do not desire to be limited to the exact construction disclosed.

Having thus described my invention, what I claim and desire to have protected by Letters Patent in the United States is 1. In an elevator, the combination with an emergency brake, of means for automatically applying said brake at a predetermined point in the travel of the elevator car, and mechanical means operable from the car, for releasing such emergency brake at will.

2. In an elevator, the combination with hoisting apparatus, of a brake therefor, means for applying said brake at a predetermined point in the travel of the car, and means entirely mechanical for releasing said brake at v will.

3. In an elevator, the combination with hoisting apparatus, of a brake therefor, a brake lever, means for actuating said lever about a fulcrum to apply the brake, and means entirely mechanical for destroying the fulcrum to effect the release of the brake.

4. In an elevator, the combination with hoisting apparatus, of a brake, a brake lever, means for actuating said lever to apply the brake, mechanism for holding the fulcrum of the brake stationary, and a device for actuating the holding mechanism to set free the said fulcrum and effect the release of the brake.

5. In an elevator, the combination with hoisting apparatus, of a brake therefor, means for applying said brake, toggle mechanism, and means for operating said toggle mechanism to effect a release of the brake.

6. In an elevator, the combination with hoisting apparatus, of a brake therefor, brake-applying mechanism, a toggle, means for holding said toggle in fixed position, a spring connected to said toggle, and a device for actuating said holding-means to permit said spring to break said toggle and effect the release of the brake.

7. In an elevator, the combination with hoisting apparatus, of a brake therefor, a brakeapplying device, toggle mechanism co-acting with said brake-applying device to permit the latter to operate and to hold said brake applied, and means for operating the toggle mechanism to render the brake-applying device inoperative.

8. In an elevator, the combination with a hoisting device, of a brake therefor, a brake lever, stop-motion apparatus for said hoisting device and co-acting with said brake lever to effect the application of the brake, mechanical means for holding the fulcrum of the brake lever stationary, and an emergency brake rope for actuating said holding means to free the said fulcrum and effect the release of the brake.

9. In an elevator, the combination with a hoist; of a brake therefor; a brake lever; stop-motion apparatus connected to said hoist and to said brake lever to effect the ap. plication of the brake at the limits of travel of the elevator car; an additional lever connected to a fixed pivot at one end and to a movable pivot at the other end; a pivotal connection between said levers to form the fulcrum of the brake lever; a toggle connected to one end of said additional lever; a latch and stops for holding said toggle, additional lever and fulcrum stationary; a spring connected to said toggle; and a rope connected to the latch to release the same and permit the spring to break the toggle and move both said levers to effect the release of the brake.

10. In an elevator, the combination with hoisting apparatus, of stop-motion mechanism connected thereto', a brake, a brake-applying lever, a cam connected between said stop-motion mechanism and said lever, mechanical means for holding the fulcrum of the brake lever stationary, a spring, and

means for releasing said holding-means to free the said fulcrum and lift the brake lever to effect the release of the brake.

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

JOHN DILLON.

Witnesses:

CHARLES BEHRENS, Jr., DANL. A. HAY.