Front loading projection unit with threaded resilient retention

Details Front loading projection unit with threaded resilient retention Front loading projection unit with threaded resilient retention

1980-12-03

1983-07-05

Walsh, Donald P.

Illumination

Light source and modifier

Including reflector

362226, 362440, F21V 700

Patent

active

043921892

ABSTRACT:
An improved projection unit including a glass reflector and a capsule member (tungsten halogen lamp and metallic retention member) removably positioned within the reflector. The projecting end of the metal retention member is threaded only on two sides and adapted for having a single thread annular nut positioned thereon to retain the capsule securely within the reflector. The nut is resilient to assure that damage to the reflector, boxlike members, or nut itself is prevented, and also to compensate for thermal expansion.

REFERENCES:
patent: 1848812 (1932-03-01), Wiley
patent: 4219870 (1980-08-01), Haraden

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