Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1979-06-13
1980-10-07
Pollard, Steven M.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200 81R, 200337, 200251, 92 1351, 92 137, H01H 300, H01H 3524, H01H 150
Patent
active
042270596
ABSTRACT:
In a driving mechanism for a vacuum circuit breaker including a movable contact, a stationary contact and bellows permitting reciprocating movement of the movable contact, a bell crank is oscillated by an actuating device to reciprocate a drive bar connected to the movable contact. As the movable and the stationary contacts are worn, the displacement of the drive is increased. The increase is detected and the pivot point of the bell crank is shifted toward the stationary contact. Thus retracted position of the movable contact is shifted in accordance with the wear, and the stroke of the movable contact and hence the amplitude of variation in length of the bellows are maintained constant in spite of the wear.
REFERENCES:
patent: 2548807 (1951-04-01), Morgan et al.
patent: 2898867 (1959-08-01), Saalfrank
patent: 4146766 (1979-03-01), Forrester et al.
Journal of Fuji Elec. Co., Ltd., vol. 51, No. 9, pp. 26-31, 1978.
General Elec. Co., GEA-8183C, 9/73.
Pollard Steven M.
Tokyo Shibaura Denki Kabushiki Kaisha
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