US857550A - Compound brake. - Google Patents

Description

1; DILLON,

' COMPOUND BRAKE. unmmzbx nun 00m, 1906.

PATENTED JUNE 18, '1907.

UNITED STATES PATENT oEEioE.

JOHN DILLON, OF MILWAUKEE, VVISCON SIN,'ASSION OR TO OTIS ELEVATOR COMPANY, OF JERSEY OITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

COMPOUND BRAKE.

Original application filed a c 22,1906, Serial No. 307,334. Divided and this application filed October 3, 1906.

To a, whom] it may concern.

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

My invention relates to elevators and is a division of my co-pending application, Serial No. 307,334, 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 releasing the emergency brake from the car of an elevator system after said brake has been applied automatically to prevent the overrunning of the car at its 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 i may be broken at will to effect the release of such emergency brake, and automatic means for resetting said toggle to normal position.

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

' Figure 1 shows an elevation of hoisting apparatus with my invention applied thereto; and Fig. 2 is a side elevation of a hoisting apparatus with a motor added, and showing the elements of my invention in detail.

Referring to the accompanying drawings, A designates a brake pulley of an elevator apparatus which may be operated by an electric motor II, or by any other kind of motor, preferably controlled from within the car. It will be obvious, however, that my invention is equally adapted to such elevator devices as are controlled from a stationary position instead of from within the car. An 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 Specification of Letters Patent.

Patented June 18, 1907.

Serial No. 337,256.

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 portion of the 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 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 6, this being one form of such resistance. The cam E comprises an endless groove T 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 H is pivotally connected at g with the lever G, and one end of said lever H is shown in Fig. 2 pivotally connected at h to 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 Fig. 2, is pivotally connected to a toggle N, the upper end of which is pivotally connected at Nto the bracket N, secured to the gear casing O of the elevator apparatus. As shown in Fig. 2, the central point p of the toggle is normally held slightly to the left with the voke Z against the fixed stop Y.

It will be seen that one of the arms U of the Z which isconnected pivotally to the middle point p of the toggle, rests against the fixed stop Y, being held in such position by the weight W. To the left side of the yoke Z is connected a rod K which passes through an opening in the stop Y and serves as a guide for the movement of the toggle mechanism, but its main purpose is to prevent the weight W from being thrown past a vertical central position. This is accomplished by the adjustable collar L fixed to the outer end of the rod K, as by means of a set screw. To the right-hand end of the yoke Z is connected the operating rope R which passes under the direction sheave R, and thence to the point where it is desired to operate the brake-releasing mechanism. In this instance it is intended that the rope shall be a standing rope within reach of the operator in anelevator car.

When the operator of the elevator fails to eifect the stopping of the elevator motor when the car approaches a terminal landing, the traveling clutch nuts D and 0 cause rotary motion of the cam E. At this time the points 9 and h are held stationary and consequently also the lever II. This provides a fixed fulcrum at g for the brake lever G, and therefore, as the cam E revolves, the point f at the outer end of the lever G is moved up wardly 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, 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 brakemust 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 toggle N held in normal position by the weight W, in addition to some means, as for example, a rope R, for releasing the toggle. When it is, therefore, desired to release the brake, the rope R is pulled upwardly so as to move the central point p of the toggle to the right of a line passingthrough the pivotal point N and P, instead of to the left as shown in Fig. 2. The point P which has hithereto been fixed, is now moved upwardly, and so also the pivotal point 9, and consequently the brake 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 pulley A. The elevator car may now start and in doing so, the weight F through its flexible connection e, will move the cam E to its original position, that is, to the position indicated in Fig. 2. This action, however, will not reset or replace the toggle mechanism to its original position. In the application hereinbefore referred to, this resetting must be done manually. In order to provide for an automatic resetting of the toggle, I have provided the weight W connected as already described. It will now be evident that when the car approaches a terminal landing, or goes a predetermined distance beyond the same, the cam E will be operated to positively apply the emergency brake and thus stop the elevator apparatus. In order to release the emergency brake so that the car can be operated in the opposite direction, the rope R is pulled upwardly against the action of the weight NV and the toggle N, so that the latter will be broken and the fixed fulcrum g changed to a floating fulcrum. After the car has traveled in the opposite direction a short distance, the rope R may be released and the weightW will automatically reset the toggle mechanism without effecting the application of the emergency brake for the reason that the point f is now in that portion of the groove T farthest from the center.

Obviously those skilled in the art may make various changes in the details and a1- rangement of parts without departing from the spirit and scope of my invention, and I desire, therefore, not to be limited to the exact construction herein disclosed.

Having thus described my invention, what I claim and desire to have protected by Letters Patent of the United States is 1. In an elevator, the combination with a brake, of a brake-applying device comprising a pivoted lever, mechanical means for holding the fulcrum of said lever stationary, a de vice for actuating said mechanical means to release the brake, and means for automatically resetting said mechanical means.

2. In an elevator, the combination with a brake, of a brake lever, means for automatically operating said brake lever to apply the brake, toggle mechanism connected to the brake lever, a stop engaged by the toggle for holding the fulcrum of the brake lever stationary, a rope connected to the toggle to actuate the same and effect the release of the brake, and means for automatically resetting the toggle mechanism and the brake lever fulcrum.

3. 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, mechanical means operable from the car for releasing such emergency brake at will, and automatic means for resetting said mechanical means.

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

5. In an elevator, the combination with hoisting apparatus, of a brake therefor, a brake lever, means for actuating said lever about the fulcrum to apply the brake, means entirely mechanical for displacing the fulto effect a release of said brake, and aut- -matic means for resettmg said toggle mechpermit the latter to operate, and to hold said crum to effect the release of the brake, and means for automatically resetting said mechanical means.

6. 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, a device for actuating the holding mechanism to set free the said fulcrum and effect the release of the brake, and automatic means for resetting said device to normal position.

7. In an elevator, the combination with hoisting apparatus, of a brake therefor, means for applying said brake, toggle mechanism, means for operating said toggle mechanism anism.

8. 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 deplace said toggle and effect the release of the brake, and automatic means for resetting said toggle.

9. In an elevator, the combination with hoisting apparatus, of a brake therefor, a brake-applying device, toggle mechanism coacting with said brake-applying device to' brake applied, means for operating the toggle mechanism to render the brakeapplying device inoperative, and means for automatically resetting the toggle mechanism to operative position.

10. 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, me-

chanical means for holding the fulcrum of the brake lever stationary, an emergency brake rope for actuating said holding means to free the said fulcrum and effect the release of the brake, and automatic means for resetting said holding means.

11. 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 application 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 a fulcruin of the brake lever; a toggle connected to one end of said additional lever; a stop for limiting the movement of said toggle; a weight for holding the toggle against said stop, and the additional lever and fulcrum stationary; and a rope connected to the toggle to release the same and effect displacement of said fulcrum and the release of the brake.

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

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

JOHN DILLON.

Witnesses H. H. MEIXsELL, A. F. JUPP.

Images