Electricity: circuit makers and breakers – Electric switch details – Cases and bases
Patent
1986-11-14
1988-08-09
Luebke, Renee S.
Electricity: circuit makers and breakers
Electric switch details
Cases and bases
200153T, 200 47, H01H 904
Patent
active
047629720
ABSTRACT:
A precision subminiature, snap action switch and an externally actuated, heavy duty, spring loaded self-return type operator therefor are enclosed within an hermetically sealed housing. The operator employs a switch actuating cam having shoulders cooperable with shoulders on the interior of the housing to define the limits of cam movement, said cam also having a shoulder cooperable with a shoulder on a switch lever to trip the switch upon movement of the externally actuated operator shaft a precise amount away from its at rest position. A connector/switch subassembly sealingly closes a housing opening, provides a rigid, precision mounting for the switch, and also provides external electrical connections for the switch. The operator has an externally projecting shaft which extends through a shaft bearing/rotary seal assembly employing a silicone rubber O-ring member and oil for lubricating a shaft bearing and the O-ring member, there being additional polytetrafluoroethylene O-ring members which prevent escape of the lubricating oil. An end cap sealingly closes another housing opening, provides a bearing for the inner end of the operator shaft, and exerts a predetermined stress on the operator spring. The structure lends itself to a simplified fabrication method.
REFERENCES:
patent: 2817736 (1957-12-01), Bastian
patent: 2878348 (1959-03-01), Haydon et al.
patent: 3053950 (1962-09-01), Dobes
patent: 3458679 (1969-07-01), Russell et al.
patent: 3905450 (1975-09-01), Persson
Luebke Renee S.
Otto Engineering, Inc.
Silver Robert D.
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