Retractable lighting system

Details Retractable lighting system Retractable lighting system

1991-08-14

1992-08-25

Dority, Carroll B.

Illumination

Light source and modifier

Adjustable or repositionable light source or light source...

362386, 362364, F21V 2126

Patent

active

051424630

ABSTRACT:
A light fixture device and system for extending and retracting a light is set forth which includes a housing having an axis of extension and a carriage which is carried by the housing and adapted for axial movement relative to the housing. A direct current motor is coupled to a drive member for axially extending and retracting the carriage and a two-position limit switch having a directionally reversible actuator responsive to a tripping force and in electrical communication with the motor. The tripping force moves the two position limit switch from a first position to a second position when the carriage is extended and from the second position to the first position when the carriage is retracted. A circuit for extending and retracting the lighting system is comprised of a light detector circuit, a logic circuit, a timer circuit and a driver circuit. The light detector circuit resets the timer circuit and also provides output to the logic circuit to control operation of the driver circuit which contains a relay for changing the polarity of the direct current voltage applied to the motor.

REFERENCES:
patent: 4974134 (1990-11-01), Bourne
patent: 4984139 (1991-01-01), Goggia
patent: 5003441 (1991-03-01), Crowe et al.
patent: 5068773 (1991-11-01), Toth

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