Transistorized elevator control button

Details Transistorized elevator control button Transistorized elevator control button

1978-10-17

1980-10-28

Rubinson, Gene Z.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

340 19R, B66B 146

Patent

active

042302064

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 activated 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.

REFERENCES:
patent: 3506096 (1970-04-01), Robaszkiewicz
patent: 3774728 (1973-11-01), Metzler et al.
patent: 4120381 (1978-10-01), Otto et al.
patent: 4124102 (1978-11-01), Doane et al.

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