Safety device for combined ventilator/light unit

Details Safety device for combined ventilator/light unit Safety device for combined ventilator/light unit

1989-05-17

1991-06-04

Lazarus, Ira S.

Illumination

With fluid distributer

362373, F21V 3300

Patent

active

050219324

ABSTRACT:
Two thermal protectors or thermostatic sitches are mounted on the outside of the housing of a combination ventilator/lamp unit to sense any heat build-up in the housing during operation of its lamp. One switch is normally open and is connected between the lamp and the motor for the ventilator fan; and the other switch, which is normally closed, is connected in series with the fan motor and lamp. The normally open switch is set to close automatically when the temperature in the housing reaches a first value above room temperature, thereby to energize the fan motor to cool down the housing. If the normally open switch and/or the fan motor fails the normally closed switch is set to open at a temperature above that at which the normally open switch closes, and functions as a safety switch to disconnect both the fan motor and lamp from the power supply.

REFERENCES:
patent: 3786233 (1974-01-01), Bumpus et al.
patent: 3909589 (1975-09-01), Stone et al.
patent: 3958100 (1976-05-01), Stone
patent: 4450512 (1984-05-01), Kustofek
patent: 4453202 (1984-06-01), Morris et al.
patent: 4748900 (1988-06-01), Swin, Sr. et al.
patent: 4827386 (1989-05-01), Mackiewicz

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