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US 4,393,286 AGranted
Vacuum circuit breakers
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorKunihiko Takagi
Life of this patent
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Abstract
A vacuum circuit breaker having a vacuum bulb comprises a coating of a greasy compound of a water repellent material provided on the outer surface of the bulb, and an insulating tube of a water repellent and heat shrinkable material provided on the coating of the greasy compound.
Claims3
In a vacuum circuit breaker having a vacuum bulb including an insulating member for containing a movable contact and a stationary contact, the improvement which comprises:
- a coating of a greasy compound of a water repellent material provided on the outer surface of said insulating member;
- an insulating tube of a water repellent and heat shrinkable material provided on said coating of the greasy compound;
- and
- insulating rings between said coating of the greasy compound and said insulating tube.
1 more element
Dependencies are inferred from the claim text.