Electricity: circuit makers and breakers – Electric switch details – Indicators
Patent
1979-08-30
1981-03-03
Shepperd, John W.
Electricity: circuit makers and breakers
Electric switch details
Indicators
200DIG47, 335 17, 335132, H01H 908, H01H 918, H01H 5100
Patent
active
042543169
ABSTRACT:
Electromagnetically operated contactor or relay employing contact modules which are removably mounted in either of two positions respectively providing normally open and normally closed contact conditions. One set of contact modules is mounted in a main frame and a second set is mounted in an upper frame which overlies the main frame and obscures the first set of contact modules. Transparent viewing members extend through apertures in the upper frame. Each transparent viewing member has a viewing surface exposed externally of the upper frame and an image transmitting surface adjacent to a contact module of the underlying first set. Each contact module has two light reflecting surface areas which are distinguishable from each other, one or the other being adjacent to the image transmitting surface of the associated transparent viewing member depending upon the position of the contact module. Thus, the images of the light reflecting surface areas appearing at the viewing surfaces of the transparent viewing members provide visual indications of the positions and consequently the normal contact conditions of the underlying contact modules.
REFERENCES:
patent: 3437773 (1969-04-01), Koertge
patent: 3501717 (1970-03-01), Schubring et al.
patent: 3724922 (1973-04-01), Jones
patent: 3916133 (1975-10-01), Bollinger
patent: 4087770 (1978-05-01), Kuhn et al.
patent: 4117428 (1978-09-01), Streich et al.
patent: 4117429 (1978-09-01), Streich et al.
patent: 4156149 (1979-05-01), Vaccuri
Clark Control, Inc.
Keay David M.
Shepperd John W.
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