Safety lamp apparatus including means for preventing accidental

Details Safety lamp apparatus including means for preventing accidental Safety lamp apparatus including means for preventing accidental

1982-03-23

1984-01-24

Nelson, Peter A.

Illumination

Light source and modifier

Adjustable or repositionable light source or light source...

313 50, 313634, 362106, 362288, 362320, 362164, 362223, 362390, 362198, 362306, 362397, F21V 1504

Patent

active

044280394

ABSTRACT:
Safety lamp apparatus, suitable for use as a miner's cap lamp, includes a housing body closed at one side by a plastic light transmitting member. A bulb member is yieldably received in the housing body and is operable, when energized, to provide a filament in a state of incandescence for emitting visible radiation. During use of the apparatus in an explosive atmosphere conditions may arise where deformation of the light transmitting member from external impact forces directed thereagainst may drive deformed portions of the light transmitting member against the bulb member with sufficient force to cause bulb breakage and resulting explosion of the atmosphere.
In the present invention protective means is provided comprising an arrangement of parts defining an oblique angular relationship between the central longitudinal axis of the bulb member and the impacting surface of the deformed portion of the light transmitting member. The protective means may, in one desirable form, include a cylindrical projection from the inner surface of the light transmitting member truncated such that the plane of truncation lies at an oblique angle to the central longitudinal axis of the bulb member. With this arrangement impact against the bulb, arising from deformation of the light transmitting member, causes angular displacement of the bulb and thus breakage is avoided. The oblique angular relationship may also be realized with other arrangements of parts as hereinafter disclosed.

REFERENCES:
patent: Re30498 (1981-01-01), Baldwin
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patent: 3300637 (1967-01-01), Martland
patent: 4071749 (1978-01-01), Balogh
patent: 4075472 (1978-02-01), Higuchi
patent: 4112485 (1978-09-01), Sutter
patent: 4146918 (1979-03-01), Tureck
patent: 4176263 (1979-11-01), Rousseau
patent: 4240853 (1980-12-01), Pustka

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