B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
B66B 1/14 (2006.01) B66B 1/46 (2006.01)
Patent
CA 2047960
A replacement elevator call button unit which may be electrically connected to an Otis 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 con- trolled rectifier) which is electrically connectible between the power supply lines. A normally open push but- ton 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. The second switch switches the first switch from the inoperative state to the operat- ive 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.
Oyen Wiggs Green & Mutala Llp
S.b.m. Electronic Specialities Ltd.
LandOfFree
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