Photoelectric switch sealed against infiltration of contaminants

Details Photoelectric switch sealed against infiltration of contaminants Photoelectric switch sealed against infiltration of contaminants

1991-06-17

1993-03-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

341 31, G01D 534

Patent

active

051912090

ABSTRACT:
A photoelectric switch is sealed against the infiltration of contaminants, for example, oil mist within a combustion-powered tool comprising a switch. In a housing structure sealed by an O-ring when assembled, two photoelectric devices define a line of sight therebetween. A plunger is biased to an inoperative position, in which a shutter portion thereof blocks the line of sight. In an operative position, the shutter portion unblocks the line of sight. The plunger has a stem portion sealed by another O-ring. Where electrical leads from the devices extend through apertures defined within the back member, the apertures are sealed by solder used to connect leads to copper layers, which may be screen-printed upon an outer surface of the back member. A cap mounted upon the back member covers the contacts and admits electrical wires soldered to the layers.

REFERENCES:
patent: 4607160 (1986-08-01), Sakakino

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