Replacement elevator call button unit

Details Replacement elevator call button unit Replacement elevator call button unit

1991-07-29

1993-06-29

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

34081513, 340332, 315129, 315136, 200314, B66B 300, G08B 536

Patent

active

052236781

ABSTRACT:
A replacement elevator call button unit which may be electrically connected to an elevator controller having first and second power supply lines and having an elevator call registering terminal. The replacement unit includes an electronic switch (preferably a silicon controlled rectifier) which is electrically connectible between the power supply lines. A normally open push button is electrically coupled to the switch in order to switch the first switch from an inoperative state in which current flow between the power lines is prevented, to an operative state in which such current flow is permitted. A voltage divider is provided for electrical connection across the elevator call registering terminal, in series with the switch means. Cross firing between two or more corresponding replacement units is accomplished by a second electronic switch (preferably a photo diode) optically coupled to the first switch, without requiring any additional wiring. The second switch switches the first switch inoperative state to the operative state upon application of a predetermined signal to the call registering terminal by the elevator controller. The second switch is electrically connectible between the call registering terminal and the second power supply line.

REFERENCES:
patent: 3307071 (1967-02-01), Diamond
patent: 4126849 (1978-11-01), Mente et al.
patent: 4951787 (1990-08-01), Lind et al.

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