Glass breakage detectors employing piezoresistive devices

Details Glass breakage detectors employing piezoresistive devices Glass breakage detectors employing piezoresistive devices

1980-08-19

1982-04-27

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340541, 340550, 340566, 340665, 310329, 328 13, 328 47, 200 6108, 73517R, 73570, 73579, G08B 1304

Patent

active

043273599

ABSTRACT:
A glass breakage detector includes a cantilever assembly incorporating a base member having a first beam coupled thereto. The base assembly is secured to a pane of glass with the beam extending along an axis determined by the plane contaning the glass. A piezoresistive device is positioned on the beam and adapted to change its resistance upon deflection of the beam due to the breakage of said glass and based upon the application of a vector component of force as deflecting the beam. Other embodiments employ at least another cantilever assembly also having a beam and sensor with the beam directed relatively transverse to the first beam and adapted to respond to force components normal to said vector component.

REFERENCES:
patent: 2722614 (1955-11-01), Fryklund
patent: 2963911 (1960-12-01), Courtney-Pratt
patent: 3351880 (1967-11-01), Wilner
patent: 3545283 (1970-12-01), McGunigle
patent: 3582692 (1971-06-01), Palin
patent: 3665259 (1972-05-01), Brailsford
patent: 3693425 (1972-09-01), Starita et al.
patent: 3820401 (1974-06-01), Lewis
patent: 3825920 (1974-07-01), Nelson et al.
patent: 3863250 (1975-01-01), McCluskey
patent: 3884085 (1975-05-01), Beckman et al.

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