Circuit breaker having semi-moving piston
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United States of America Patent
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-
Jan 12, 1999
Grant Date -
N/A
app pub date -
Nov 24, 1997
filing date -
Nov 28, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A puffer type circuit breaker comprising a compression chamber closed by a pressure wall of a semi-moving piston, a first mechanism for preventing the piston from moving during a first portion of the opening displacement of the moving contact assembly, and a second mechanism for axially displacing the piston together with the moving contact assembly during the second portion of the same displacement. The piston includes a cylindrical guide portion secured to the wall. The first mechanism comprises an abutment member disposed between the end of the guide portion of the piston and a fixed retaining part, said abutment member being retractable. The second mechanism comprises an arrangement for retracting the abutment member, and acting at the end of the first displacement portion.
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