| 摘要 |
An improved limited-travel linkage for "cracking" a gas blast valve in a circuit breaker. A projection from a portion of the circuit breaker linkage travels along an arc in interfering relationship with a spring-loaded latch on a crank. Movement in one direction engages the latch, turning the crank and cracking the valve. Arc quenching gas then flows through a conduit to the interrupter contacts to blow out the arc drawn between them.
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