Electric sockets

Details Electric sockets Electric sockets

1975-10-15

1976-10-19

McGlynn, Joseph H.

Geometrical instruments

H01R 1344

Patent

active

039867633

ABSTRACT:
A shuttered electrical socket for use with either a three pin plug or a two pin plug has a housing with a front panel having spaced first and second pin-receiving holes and a third hole which is between the first and second holes but is displaced slightly from the imaginary line joining those holes; the third hole receives an earth pin if provided on the plug. A platform is located below the front panel and carries a shutter member which can slide both parallel to, and transversely to, the imaginary line. The shutter member has locking portions which cooperate with complementary parts on the housing or platform preventing movement of the shutter member parallel to the line to its open position, unless it has been first displaced in the transverse direction.
The shutter member is biased to the closed position and to a transverse position in which the locking portions are effective. When pins are simultaneously introduced into the first and second holes they first engage cam surfaces on the shutter member causing the latter to be displaced transversely to render the locking portions ineffective. Then the pins engage ramp surfaces on the shutter member causing it to move parallel to the imaginary line to the open position in which the pins can pass through the platform to engage contacts below it.

REFERENCES:
patent: 2740943 (1956-04-01), Young
patent: 3222631 (1965-12-01), Cohen

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