Electric plug lock means

Details Electric plug lock means Electric plug lock means

1977-09-29

1978-09-05

Lake, Roy

Geometrical instruments

339195M, 339252R, H01R 306

Patent

active

041115090

ABSTRACT:
A plug for an electrical receptacle outlet having an improved ground prong. The ground prong is supported in the plug body for axial shifting. The end of the prong extending through the plug body is threaded to engage a turn knob and the other end of the ground prong extending from the plug body for insertion in the receptacle is adapted to carry spring filaments which are supported to radially arch by the axial movement of the ground prong in response to the rotation of the knob and thereby secure the plug connected to the receptacle.

REFERENCES:
patent: 3044035 (1962-07-01), Adams, Jr.
patent: 3358265 (1967-12-01), Robards

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