Emergency exit bar with dual sensors

Details Emergency exit bar with dual sensors Emergency exit bar with dual sensors

1995-02-06

1996-05-14

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

49 25, 70 92, 292 92, 340521, 340540, 340556, 340562, G08B 2100

Patent

active

055171761

ABSTRACT:
An exit bar has an elongated body for mounting on an exit door. The exit bar incorporates a pair of independent sensors. An infrared beam is generated along the front of the bar. An infrared detector produces a first signal when the beam is interrupted. The first signal results in release of a lock securing the door. If the beam is interrupted for longer than a pre-set time limit, a first alarm sounds. A capacitance sensor produces a second signal when the sensor detects changes of capacitance in the bar as a result of contact or near contact with foreign objects. The second signal also results in release of the lock securing the door. If the capacitance sensor detects a capacitance change for longer than a pre-set time limit, a second alarm sounds.

REFERENCES:
patent: 4006471 (1977-02-01), Pappas
patent: 4763937 (1988-08-01), Sittnick, Jr. et al.
patent: 4804945 (1989-02-01), Millet
patent: 4831279 (1989-05-01), Ingraham
patent: 4893852 (1990-01-01), Harris et al.
patent: 4961330 (1990-10-01), Evans
patent: 5027552 (1991-07-01), Miller et al.

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