Progressively fused ceramic seals between spaced members such as

Details Progressively fused ceramic seals between spaced members such as Progressively fused ceramic seals between spaced members such as

1981-04-06

1984-01-10

Askin, Laramie E.

Electricity: conductors and insulators

Insulators

Through wall or plate

65 5934, 65 5935, 403 29, 403 30, 403179, H01B 1726, C03C 2702, C03C 322

Patent

active

044254768

ABSTRACT:
A ferrule is provided with an opening extending through the ferrule and a terminal pin is disposed in the opening in spaced relationship to the ferrule. A plurality of insulating members are disposed on the terminal pin in the opening in a stacked relationship. Each of the insulating members is fused to the terminal pin and the ferrule. Each of the insulating members in the stack has a higher temperature of fusion than the preceding members in the stack. The insulating members in the stack are progressively fused to the ferrule and the terminal pin by the application of progressive temperatures to the terminal pin, the ferrule and the insulating members.
The insulating members having the highest temperature of fusion are provided with properties of being able to withstand large forces without any degradation of the fusion with the terminal pin and the ferrule. The insulating members of the reduced temperatures of fusion are able to withstand other types of shock such as sudden changes in temperature.
The terminal pin extends through the ferrule to a position external to the ferrule. An additional insulating member is disposed on the ferrule in hermetically sealed relationship with the terminal pin and the ferrule at the external position.

REFERENCES:
patent: 1558524 (1925-10-01), Winninghoff
patent: 1562533 (1925-11-01), Weintrub
patent: 2100187 (1937-11-01), Handrek
patent: 2517019 (1950-08-01), Nordberg
patent: 4282395 (1981-08-01), Hagemann

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