Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Patent
1991-03-05
1993-02-23
Picard, Leo P.
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
220334, 336 90, 174 521, H05K 500
Patent
active
051892570
ABSTRACT:
A transformer having an integral cabinet with an apparatus for hinging and clamping the cover of the cabinet onto its base is provided. The hinge is formed by an L-shaped member extending from a lip surrounding a planar top formed in the cover. A flange having rearward and downward extending portions extends from the rear wall of the cabinet base. The hinge engages a slot formed in the downward extending portion of the flange. The distance from the hinge to the cover top is less than the distance from the slot to the upper edge of the rear wall on which the cover top rests. Thus, rotation of the cover into the closed position with the hinge engaged causes elastic deformation of the hinge, thereby creating a spring force which clamps the cover onto the base. Elastic deformation in the flange imparts addition clamping force. Sufficient clearance is provided for this elastic deformation by either sloping the rearward extending portion of the flange or sloping the planar top of the cover.
REFERENCES:
patent: 1557454 (1925-10-01), Hammer
patent: 3815701 (1974-06-01), Mayhew
patent: 4437529 (1984-03-01), Fralish
patent: 4717216 (1988-01-01), Hornak
patent: 4963696 (1990-10-01), Owen et al.
Borgmeyer Virgil L.
Clark Thomas F.
Huests Leo H.
Ritter William J.
Tempco Dale A.
ABB Power T&D Company Inc.
Ledinh Bot
Picard Leo P.
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