Patent GB-191316550-A (GB)
Title: Improvements in or relating to Lifts and the like.
IPC: B66B13/12
Filed: 1913-07-18
Granted: 1914-06-11
Abstract: 16,550. Bone, D., and Waygood & Co., R. July 18. Lift cages and doors, locking and unlocking and operating.-Comprises an arrangement for operating lift gates by means of a motor and mechanism carried by the cage, characterized by the fact that the gates are first unlocked and finally re - locked by the gate - operating mechanism, the controller of the lift being inoperative when the gates are unlocked. Figs. 1, 2, and 4 show the invention applied to a lift controlled by the car switch system. The gateoperating mechanism may be mounted on the top of the cage. A screwed shaft B is arranged over the cage opening, and is driven from the motor A through suitable gearing. A nut E on the shaft B has a striker I which enters between the arms of two spring-actuated bellcranks N, J on the gate. The other arms of the bell-cranks, when the gate is closed, snap into recesses in the gate path, one being hooked to form a latch, while the other enters its recess to produce a separation of the arms between which the striker I is located. Spring buffers Q are provided for the last gate pickets. The motor A is controlled by a barrel switch on the floor of the cage operated through ratchet mechanism c, d by a pedal a, Fig. 4, against the influence of a spring e. A rack on the pedal engages a free-wheel device on the controller shaft, so that successive depressions of the pedal cause a oneway intermittent rotation of the controller barrel, a spring-roller engaging recesses in the barrel as at i to position the contacts correctly. The contacts on the barrel are staggered so as to pass current in either of two directions alternately although the barrel rotates in one direction only. A discriminating switch D and tappets M are provided, so that the nut E, at each end of its stroke, breaks the motor circuit and sets it ready for reversal at the next operation of the pedal. The switch T for starting the car is geared to a shaft G<1> outside the cage, the upper end of the shaft carrying a crank G which, when the gate is open, and the nut E away from the position shown, is engaged by an arm F<2> which locks the switch T. When the cage has stopped at a gate, the motor is started by means of the pedal a and the nut E moved to open the gate. It first releases the lever F<2>, F<3> and locks the car switch T. On further movement, the striker engages the bell-crank J causing its hook to unlock the gate. Towards the end of its travel, the tappet M is engaged and the switch D operated to break the motor circuit and reverse the connexions. On the next movement of the barrel switch, the motor is reversed, and the gates closed and locked. Fig. 7 shows the control of the gate-operating motor A in the case of a push-button lift. When one button 1 is pressed, current passes to the upper coil of a double-wound solenoid 9 and to the up solenoid 5. The circuit of the solenoid 5 is not complete because a cage switch 7 made by a contact 7<1> on the gate or on the striker arm I is interrupted. The circuit of the solenoid 9 is completed through contacts 13 bridged by a switch which is then moved to contacts 12. This completes the motor circuit through switch D, and the gates are closed, the switch D is reversed, and the switch 7 made. The solenoid 5 being then energized, the cage can be moved to another floor. On arrival, a striker 14 opens the switch 4 and stops the cage, and the switch again drops to contacts 13, completing the motor circuit so that the doors are opened.