Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1981-01-23
1982-11-09
Little, Willis
Electricity: circuit makers and breakers
Liquid contact
Time delay
200153G, 200154, H01H 300, H01H 2500
Patent
active
043586503
ABSTRACT:
During "ON" operation, the lengths of the arms of a toggle are essentially fixed; during "TRIP" operation, the length of at least one arm is effectively shortened. The toggle operates, in "ON" condition, with one arm pivotally coupled to a second arm about a fixed pivot point adjacent to a channel with respect to the second arm. In "TRIP" condition, the one arm is pivotally coupled to the other arm about at least one pivot point lying within the channel. A spring couples the two arms which are pivoted together: in "normal" conditon, one arm is pivoted about a substantially fixed point with respect to the other arm; in "TRIP" condition, one arm is pivoted about a locus of points with respect to the second arm distant from the substantially fixed point. A stationary contact is held by an insulated circuit breaker housing. A handle is pivoted about a fixed pivot point on the housing and is limited in arcuate motion by the housing. A contact arm, having a contact affixed thereto, has an attachment means, a projection, and a pocket with at least one corner. A latch normally blocks one corner of the pocket so as to provide a corner opening for reception of a portion of a link which extends from the handle. The latch, when actuated, unblocks the corner to permit the portion of the link to exit from the opening. A spring couples the attachment means to the housing so as to urge the contact arm toward the fixed pivot point. In "ON" condition, the latch blocks the one corner of the pocket and the contacts are engaged. Upon actuation of the latch, the one corner unblocks, and the portion of the link exits from the corner opening, whereupon the projection engages with a housing barrier, causing the contact arm to at least partially pivot thereabout, opening the contacts.
REFERENCES:
patent: 3293397 (1966-12-01), Zubaty et al.
patent: 4165453 (1979-08-01), Henneman
Fisher Fred
GTE Laboratories Incorporated
Little Willis
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