Patent ID: 9653239
Date: 2017-05-16
CPC Classifications: C23C,H01H,Y10T

Claim:
1. A puffer cylinder formed of pure aluminum or an aluminum alloy being linked with a movable contactor which is arranged capable of contacting with and separating from a stationary contactor, fitted with a piston inside thereof, and the piston slidably moving against an inner-wall surface of the puffer cylinder in order for the piston to suck in, or spurt an arc-extinguishable gas, the puffer cylinder comprising: a projection, and a depression in a pit-like shape formed at least on the inner-wall surface of the puffer cylinder; and a coat including a dehydrate of a hydrated oxide of aluminum, the coat being formed on the projection, and the depression in a pit-like shape of the puffer cylinder.