Environmentally protected switch construction

Details Environmentally protected switch construction Environmentally protected switch construction

1981-10-28

1983-11-08

Miller, J. D.

Electricity: circuit makers and breakers

Centrifugal

Liquid contact

200 83J, 200302, H01H 1963

Patent

active

044144431

ABSTRACT:
A switch assembly for a dynamoelectric machine is provided with a protected switch contact for preventing foreign matter from affecting switch contact operation. Preferably, the assembly includes a support. A plurality of electrical connections are attached to the support. The switch assembly functions as an interface permitting connection of an external source of power to the dynamoelectric machine. The protected contact is a part of the start winding circuit and the protective device preferably includes a cap structure having a closed bottom and an open top. A second electrical contact is mounted to a switch arm through the cap structure and is movable in response to force applied to the switch arm. The open end of the cap structure is closed by a series of elements including a first washer. A soft compressible or pliable washer is positioned inboard of the first washer. A third metallic washer is positioned inboard of the pliable washer. A spring is positioned inboard of the third metallic washer, the spring being biased between the support surface and the third metallic washer so that the contact protecting elements remain in compliant abutment with the cap structure.

REFERENCES:
patent: 3185788 (1965-05-01), Zollmann
patent: 4002868 (1977-01-01), Jooss et al.
patent: 4038506 (1977-07-01), Filip

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