US536605A - Elevator safety device - Google Patents

Description

(No Model.) l

J. COOPER. ELEVATOR SAFETY DEVISE. No. 536,605. y Patented Apr. 2, 1895.

i f l E Ato IMILHTED STATES ljATENT OFFICE.

.IAMES COOPER, OF CHICAGO, ILLINOIS'.

ELEVAToR` SAFETY DEVICE.

SPECIFICATION forming part of Letters Patent N o. 536,605, dated April 2, 1895.

Application filed April 5,1894. Serial No. 506,410. (No model.)

To all whom it may concern:

Be it known that I, JAMES COOPER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Elevator Safety Devices, of which' the following is a specification.

My invention relates to safety devices for elevators and has for its objectto provide an improved device which, when used in connection with an elevator car, prevents said car from being started when the elevator door is open.

Referring to the accompanying drawings, Figure l is a View of the elevator shaft and driving mechanism of an ordinary hydraulic elevator with my device in position. Fig. 2 is a section on line 2-2 Fig. l. Fig. 3 is a section on line 38 Fig. 2.

Like letters refer to like parts throughout the several figures.

In Fig. l I have shown a view of an elevator shaft with the elevator car omitted, the driving mechanism being of the' ordinary hydraulic type. The controlling ropes or cables A A pass through the car and move in the ordinary.

manner by means of a lever on the car. The ends of these cables are attached to the cross piece A', pivoted to the support A2. Rigidly attached to the cross piece is the arm A3 connected to the bell ,crankl lever A4 by the rod A5. The other end of the lever A4is connected to the valve rod B, said connection being made in the ordinary manner by a sliding block. The valve rod B projects beyond the bell crank lever A4 andextends into the tube B2. A notch B3 in said valve rod (see Fig. 3) is located so that it will come opposite the pin B4 when the valve is closed. Said pin B4 works in a hole in tube B2 and is attached to one end of the box or frame B5 surrounding the tube B2 and working in the guides B6. A spiral spring B7 tends to keep the pin B4 from entering the notch B3. A coil spring Bs has one end attached to the frame B5, the other end being fastened to the flexible cord C which y extends to the top of the elevator shaft, and

is fastened to hook C. C2 C2 are guides for cord C. Each elevator door is provided with an arm C3, the cord C passing through a hole in the end of each arm. Any suitable device may be substituted for the coil spring BE4 ing that the rod B is movedas the valve moves. In case the elevator is run by an electric motor, this rod B would be attached to the rheostat arm so that it would be locked when the elevatordoor is open.

p It is evident that the several parts may be altered in form, construction and arrangement without departing from the spirit of my invention, and I therefore do not wish to be limited to the exact construction shown.

The use and operation of my invention are as follows: When the elevator doors are closed the cord C is suspended as shown in Fig. 1, and the spiral spring B7 keeps the pin B4 from engaging the valve rod B by entering the notch B3 when the valve is closed, and hence the operator in the car can move the controlling lever or rope and hence the valve,\and stop or start the car at will. If now the car is stopped at one of the iioors and the door opened, the arm C3 attached to said door carries the cord C with it (see Fig. l) and thus shortens the cord. The frame B5and hence pin B4 is pulled forward and, since the elevator is stopped, said pin enters the notch B3 in the valve rod B. As this distance is very small some device must be used in connection with the frame that will allow the cord tc be moved until the door is fully opened. Of course any suitable device may be used, the one shown in the drawings consisting of a coil spring B8 having one end attached to the frame B5. As the cord C shortens, said spring allows its motion to continue after the pin B4 and frame B5 cease to move. The spring as it is pulled out, is wound up so that it exerts a pull on the frame B5 and keeps the pin B4in the notch B3 while the door is open. said notch this valve'rod is held rigid, and hence the valve cannot be moved so as to start the car. As the door is closed the cord C returns to its normal position, and when the said c ord hangs straight the tension is taken from the frame B5 and the spiral spring -B7 moves the pin out of the notch B3 and frees When said pin is in K ICO the valve rod B. The operator can now start the car.

As described above, the valve locking device may be said to consist of two parts, viz: the valve rod B and pin B4, which move freely with relation to each other while the valve is open and which are adapted to be locked together when the valve is closed. It is evident that the result may be accomplished in a different manner than that shown in the drawings although I deem such illustration suiiicient to show the nature of my invention.

It will thus be seen that I havehere adevice which prevents the elevator operator from` starting the car until the door is closed, thus avoidingr the dangerofhaving personsinjured by starting to pass through the door after the car is in motion.

It is evident that my devicecan be used in connection with any sort of a valve, and that it may also be used in connection with arheostat arm or the like in case of electric elevators.

I claim# l. The combination in an elevator apparatus of a motor mechanism, a moving element by which said motor mechanism is controlled, a rod attached to said moving element and provided with a single notch, a pin which is opposite said notch only when the motor mechanism is stationary, but normally out of engagement With said notch, and connections between said pin and the elevator doors, said connections being unbroken both when the doors are open and closed whereby the pin is forced into said notch when one of the doors is open, and the Valve is closed.

2. The combination with the driving mechanism of an elevator, of a moving element by which said driving mechanism is controlled, a locking device for said moving element comprising two parts which move freely with relation to each other at all times when the driving mechanism is in motion but which are adapted to be locked togetherwhen the driving mechanism is at rest, and connections between said locking device and the elevator doors said connections being un'brokenboth when the doors are open and closed whereby the moving element is locked when one ofthe elevator doors is open and said moving element is in the position that brings the driving mechanism to rest.

JAMES COOPER.

Vitnesses:

DONALD M. CARTER, WALTER J. GUNTHORP.

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