Transistorized elevator control button

Details Transistorized elevator control button Transistorized elevator control button

B - Operations, Transporting

66

B

364/17

B66B 1/46 (2006.01)

Patent

CA 1131372

TRANSISTORIZED ELEVATOR CONTROL BUTTON ABSTRACT A switch is closed to generate a short duration pulse. The pulse activates a semiconductor switch which powers an indicator lamp and generates a D.C. control signal on a single conductor. A latching unit responds to the D.C. signal on the conductor to latch the switch in the acti- vated state. A reset signal consisting of half wave pulses is transmitted over the conductor. These pulses charge a capacitor coupled to the switch input to substantially the peak voltage of the half wave pulses, which deactivates the switch. The capacitor holds a voltage of sufficient level to maintain the switch in the deactivated state until the latch unit is deactivated when transmission of the reset signal stops.

334985

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