H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/214, 306/345
H01H 33/60 (2006.01) H01H 1/38 (2006.01)
Patent
CA 1222009
ABSTRACT OF THE DISCLOSURE A female interrupting contact for a current-interrupting unit includes a smoothly contoured, apertured pressure ring which is held in a groove formed in the wall of a bore through a contact body. A spring in the groove maintains the ring to one side of the bore so that the aperture is normally misaligned with the path of a male contact through the bore. When the male contact enters the aperture, it moves the ring against the action of the spring to align the aperture with its path. This alignment effects intimate sliding engagement between the male contact and both the ring and the wall of the bore, one or both of the latter of which are conductive so that a reliable electrical path through the contacts and the interrupting unit is established. The male contact moves out of one end of the bore after the electrical path is established and arcing occurs between the contacts. The other end of the bore is closed. Gas evolved by the arc is unable to flow into the bore, due to this closure, and is carried away from the vicinity of the one end of the bore by passages defined by the contact body. Thus, the evolved gas is unable to blow the arc into the bore, which is thereby kept free of asperities which might impede movement of the male contact.
434021
Osler Hoskin & Harcourt Llp
S&c Electric Company
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