Title: Safety switch which renders HID lamp inoperative on accidental breakage of outer envelope

Abstract: HID lamp has resilient safety switch positioned proximate the inner surface of the dome portion of the protective outer envelope in contact with an extremity of a resilient leaf-spring support portion of the arc tube frame, to maintain the switch in a closed position. When the envelope is shattered, the normally closed switch will open to break the electrical path to the arc tube, thereby rendering the lamp inoperative.

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Inventors: Petro, John (Belleville, NJ, US)

Application Number: 651306
Filing Date: 1976-01-22
Publication_date: 1977-03-22
Assignee: Westinghouse Electric Corporation (Pittsburgh, PA)
Primary Class(es): 315/73 313/17, 313/639, 315/74, 315/106, 315/107, 315/119
Other Classes:
US Patent Ref:

2113314	Apr, 1938	Brueckmann	315/47.
2286789	Jun, 1942	Dench	315/47.
2950417	Aug, 1960	Breeding et al.	315/75.
3767965	Oct, 1973	Collins et al.	315/75.
3872340	Mar, 1975	Collins	315/75.
3965387	Jun, 1976	Stuart et al.	315/73.

Other Refs: 267,753

Apr, 1970	SU

Primary Examiner: Chatmon, Jr., Saxfield
Assistant Examiner:
Attorney: Palmer; W. D.