Photoelectric switch sealed against infiltration of...

Details Photoelectric switch sealed against infiltration of... Photoelectric switch sealed against infiltration of...

H - Electricity

01

H

H01H 1/64 (2006.01) G01V 8/12 (2006.01)

Patent

CA 2069279

A photoelectric switch is sealed against infiltration of contaminants, such as oil mist in a combustion-powered tool comprising such a switch. In a housing structure sealed by an O-ring where 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 such devices extend through apertures in the back member, such apertures are sealed by solder used to connect such leads to copper layers, which may be screen-printed on an outer surface of the back member. A cap mounted to the back member covers such contacts and admits electrical wires soldered to such layers.

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