Electrical connectors – With unauthorized connection preventer – e.g. – key or... – Prong cover
Patent
1991-09-03
1992-12-15
Bradley, Paula A.
Electrical connectors
With unauthorized connection preventer, e.g., key or...
Prong cover
439449, 70360, H01R 1344
Patent
active
051711559
ABSTRACT:
An apparatus to prevent the insertion of the prongs of an electric cord plug into an electric outlet, where at least one of the prongs has a hole through it, includes a casing having ports for receiving the prongs of the plug, a latch within the casing for sliding through the prong hole, a lock connected to the latch such that the lock controls the operation of the latch, and a key for operating the lock. At least one channel may optionally be provided in the casing into which the portion of the cord extending from the locked plug can be laterally fitted. The lock preferably includes a sliding cylinder, a tumbler having a keyhole for receiving a key, rotatably fit within said sliding cylinder, a tube for containing the sliding cylinder, extending into the casing, a spring within the tube for biasing the sliding cylinder to protrude out of the tube and the casing, a bolt mounted on the tumbler which rotates with the tumbler, a slot in the tube through which the bolt can slide axially when the sliding cylinder slides within the tube and radially to permit the bolt to rotate and lock against axial movement. The latch is preferably attached to the sliding cylinder and slides into the prong hole when the sliding cylinder is depressed.
REFERENCES:
patent: 2654073 (1953-09-01), Katz
patent: 4025140 (1977-05-01), Matys
patent: 4611477 (1986-09-01), Crites
patent: 5006960 (1991-04-01), Kallin et al.
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