Fire detector with anti-tampering measures for use in vehicles

Details Fire detector with anti-tampering measures for use in vehicles Fire detector with anti-tampering measures for use in vehicles

1992-11-23

1994-08-16

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specified housing

340628, 340438, 340945, G08B 1700

Patent

active

053390725

ABSTRACT:
A fire detector installed in a low ceiling surface of a vehicle such as an aircraft or train is equipped with an antitampering measure for preventing tampering such as covering the exposed portion of the fire detector with a paper cup or a vinyl bag or such as by sticking chewing gum or tissue paper in the smoke inlet portions thereof. Such tampering is usually carried out by passengers trying to sneak a smoke in a non-smoking area. The fire detector includes a main body having a head portion for letting in combustion products and a fire detection portion for performing fire detection on the basis of the combustion products let in from the head portion, and a mounting portion containing most of the main body and provided with a central opening portion for allowing the head portion to protrude from the ceiling surface so as to perform fire monitoring. The detector is further provided with a plurality of fins around the central opening portion of the mounting portion as an antitampering measure, each fin having a high portion with a height equal to or higher than that of the head portion protruding from the mounting portion and a spreading portion that gradually decreases in height with distance away from the main body.

REFERENCES:
patent: 3959788 (1976-05-01), Tipton et al.
patent: 4092641 (1978-05-01), Bellinghausen et al.
patent: 4238679 (1980-12-01), Macmillan et al.
patent: 4529976 (1985-07-01), Jameson et al.
patent: 4630037 (1986-12-01), Escamilla, Jr.
patent: 4740703 (1988-04-01), Inamura
patent: 4853544 (1989-08-01), Inamura

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