Geometrical instruments
Patent
1984-06-04
1985-10-01
McQuade, John
Geometrical instruments
339 45M, 339 58, 339 74R, 339 75P, 339267, H01R 13629
Patent
active
045442169
ABSTRACT:
To hold a plug and socket together, a three-prong plug including two active prongs and a grounding prong is provided with an additional locking member which is recessed into the grounding prong. The grounding prong on the male portion of the plug has a V-shaped or U-shaped cross-section with the two sides of the electrical prong coming together with a ramp configuration at the outer end of the prong. An elongated locking member is mounted for longitudinal movement within the cross-sectional configuration of the grounding prong, with the outer end of the locking member engaging the ramp when the locking member reaches its extreme outer position to force the locking member transversely out of the recess within the U-shaped or V-shaped configuration of the third prong and into engagement with a portion of the mating female prong. In addition, arrangements are provided for normally biasing the locking member toward the outer end of the grounding prong; and release arrangements are secured to the male plug and in engagement with the locking member for unlocking the locking member and concurrently by moving the release member in a single direction for pulling the two plugs apart.
REFERENCES:
patent: 2005441 (1935-06-01), Shearer
patent: 2261615 (1941-11-01), Cornwell
patent: 2947966 (1960-08-01), Francis et al.
patent: 3890025 (1975-06-01), Gray
patent: 4274697 (1981-06-01), Dodge et al.
patent: 4313148 (1982-01-01), Turner
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