Improved liquid tight transformer casing

Receptacles – Outlet or junction box type – Sectional receptacle

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Details

220352, B65D 634

Patent

active

048363995

ABSTRACT:
A liquid-tight seal is achieved in a two-part transformer casing by use of a U-shaped channel in the main body of the casing, the U-shaped channel being formed on one side by a rigid joint member and, on the other side, by a flexible member. Both members are molded in a single unit with the main casing, but the flexible member has a decreased cross-section relative to that of the rigid member. The cover for the casing has a lip extending into the U-shaped channel. The lip is wedge-shaped, having a minimum cross-sectional area at its furthest projection into the U. At its other extremity, the cross-sectional height of the lip slightly exceeds the perpendicular distance between the flexible and rigid members. A rectangular cross-sectional part of the lip immediately adjacent to the cover provides a contact surface for the flexible member, while the rigid member makes contact with the wedge-shaped portion over a greater area. The flexible member thus pushes the lip against the rigid member and, further, provides a backup seal should liquid pass through the seal between the lip and the rigid member.

REFERENCES:
patent: 1348550 (1920-08-01), Dister
patent: 1543533 (1925-06-01), Treanor
patent: 2259382 (1941-10-01), Ingels
patent: 2720332 (1958-10-01), Holt
patent: 3108710 (1963-10-01), Lange et al.
patent: 3355056 (1967-11-01), Fisch
patent: 3854269 (1974-12-01), Hancouc
patent: 4014450 (1977-03-01), Girotti et al.
patent: 4113098 (1978-09-01), Howard
patent: 4273406 (1981-06-01), Okagami
patent: 4491238 (1985-01-01), Tobolt

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