Driving mechanisms for vacuum circuit breakers
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorSeishi Ogawa
Life of this patent
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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.
Claims12
In a driving mechanism for a vacuum circuit breaker of the type wherein a movable contact is moved toward and away from a stationary contact, the driving mechanism having actuating means for opening and closing the vacuum circuit breaker, and a bell crank rotatable about a pivot pin and interposed between said actuating means and the movable contact, the improvement which comprises shifting means for shifting, in accordance with the wear of the movable and the stationary contacts, the pivot pin of said bell crank in parallel with the axis of the movable contact to correct the retracted position of the movable contact, to compensate for the wear of the movable and the stationary contacts.
Dependencies are inferred from the claim text.