Presence detector

Details Presence detector Presence detector

1993-10-25

1995-05-23

Green, Brian K.

Supports: cabinet structure

Arrangements of plural cabinets

Relatively movable

340567, 250342, 104295, A47B 8800

Patent

active

054174872

ABSTRACT:
A presence detector for detecting the presence of a heat source, including a motion detector having a predetermined field of view. The motion detector is activated by movement of a heat source a certain minimum amount within that predetermined field of view. An actuator is provided for moving the motion detector sufficient to change the position of the field of view by at least that minimum amount. The actuator includes a shape memory alloy wire. The motion detector is movably or rotatably mounted to a support. The actuator is connected at one end to the motion detector and at the other to the support. The actuator also includes a biasing or return spring for re-stretching the shape memory alloy wire back to its original length once it has contracted. A strain relief spring is also provided, having a spring rate substantially higher than that of the return spring, for relieving strain on the shape memory alloy wire in case the detector rotatable mounting seizes or otherwise is prevented from moving freely.

REFERENCES:
patent: 2242303 (1941-05-01), Irmischer
patent: 4672206 (1987-06-01), Suzuki et al.
patent: 4783618 (1988-11-01), Artrip
patent: 5013101 (1991-05-01), Muth
patent: 5026990 (1991-06-01), Marman et al.
patent: 5160190 (1992-11-01), Farrell et al.
ATO ATOCHEM Sensors, Inc. Data Sheets and Literature, ATOCHEM Sensors, Inc., Valley Forge, Pa.

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