Molded enclosure having zero draft openings formed in it

Details Molded enclosure having zero draft openings formed in it Molded enclosure having zero draft openings formed in it

1977-03-30

1978-06-27

Marcus, Stephen

Electricity: circuit makers and breakers

Electric switch details

Cases and bases

200303, 220 32, H01H 902

Patent

active

040977064

ABSTRACT:
A molded part, which in the preferred embodiment, comprises a plastic switch enclosure, has openings formed in it for receiving terminal elements of the switch. The openings are defined by side walls along the material thickness of the enclosure. The side walls are constructed so that they are a portion of a conic section. Each conic section has at least one line segment parallel to a line segment of the conic section delimiting the oppositely opposed side wall of the openings. The line segments are located at and define the smallest width size of the opening, all other portions of the walls defining an opening size of greater width. Consequently, the conic section and line segment pair effectively provide a no-draft, close tolerance opening through the enclosure.

REFERENCES:
patent: 3313905 (1967-04-01), Zagorski
patent: 3803342 (1974-04-01), Stearley et al.
patent: 3883705 (1975-05-01), Sebastian et al.
patent: 3944773 (1976-03-01), Schumacher
patent: 3966074 (1976-06-01), Hotchkiss et al.

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