Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-11-15
1998-07-21
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340542, 340541, 340693, 200 6167, G08B 1308
Patent
active
057839956
ABSTRACT:
A doorknob system (10) with an intrusion alarm includes a separate U-shaped battery pack (24) having mounting apparatus for mounting the battery pack on an exterior surface of an interior cover plate (22), with interengaging cover-plate and battery pack terminals (62a,b; 6a,b) for transmitting electrical energy from batteries (54) in the battery pack to an electrical alarm (26). A filler protrusion (44) on the interior cover plate spans legs (24a,b) of the U-shaped battery pack. A signal emitter (68) is mounted in the cover plate and first and second signal-actuation switches (70, 72) are mounted on a door latch assembly (20). Free wires (98a,b) are provided between the signal emitter and the door latch assembly. The second signal-actuation switch (72) is operated by a lock shaft (28) and a first signal-actuation switch is operated by rotation of a doorknob shaft (78).
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patent: 4531029 (1985-07-01), Trimble
patent: 4760380 (1988-07-01), Quenneville et al.
patent: 5179325 (1993-01-01), Aragon, Jr.
Hofsass Jeffery
La Anh
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