Sight glass structure and method of installing the same

Details Sight glass structure and method of installing the same Sight glass structure and method of installing the same

1989-11-20

1991-03-19

Heinrich, Sam

Metal fusion bonding

Process

Repairing, restoring, or renewing product for reuse

228120, 228133, 228222, 228240, B23K 1002, B23K 3102

Patent

active

050003674

ABSTRACT:
This invention is directed to a novel method of removably securing a sight glass member to a refrigeration vessel in hermetically sealed relation therewith. In accordance with the method concept, a ferrule or like tubular mounting means is fixedly attached to the vessel through an opening therein, and one end of the sight glass is located within the ferrule. Brazing metal is then positioned in contact with the sight glass member and ferrule, and the metal, member and ferrule are heated by electromagnetic induction to melt the brazing metal and form a hermetic bond between the ferrule and sight glass member. By this method, leakage associated with threaded connections, and damage to the sight glass and extreme difficulty of removing the sight glass member when resistance or arc welding methods are used, are herein substantially entirely eliminated.

REFERENCES:
patent: 3085424 (1963-04-01), Berg
patent: 3108566 (1963-10-01), Chatlos
patent: 3387363 (1968-06-01), Boggs
patent: 4744737 (1988-05-01), Yamamura et al.
patent: 4815947 (1989-03-01), Okoma et al.

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