Electrical connectors – With unauthorized connection preventer – e.g. – key or... – Prong cover
Patent
1992-04-30
1994-01-11
Bradley, Paula A.
Electrical connectors
With unauthorized connection preventer, e.g., key or...
Prong cover
439304, 439367, H01R 1344
Patent
active
052776000
ABSTRACT:
An apparatus for securing the prongs of an electrical appliance plug into a block of strong, flexible plastic. The block has a pair of grooves spaced at the appropriate distances to accommodate the parallel prongs of a standard electrical plug. Additionally, the block has an aperture to receive the third, or grounding prong of the electrical plug. A hole, receptive of a bolt, exists at right angles to the direction of insertion of the plug. The hole has a clearance region through the middle and the section of the block adjacent to the bolt head, but is threaded at the section which is opposite the bolt head. The bolt is of the appropriate length to traverse the width of the block when fully tightened into the block. Additionally, the hole may be recessed to form a depression around the bolt head to discourage tampering or probing. Similarly, a recessed region may be formed on the face of the block into which the plug is inserted to likewise discourage tampering or probing. In operation, once the plug prongs are inserted into the block, the bolt is tightened, and retentive force is applied to the prongs of the plug to prevent removal. Optionally, a groove may be positioned on the side of the block, and a hole may be located in the end of the bolt. This combination allows the shackle of a padlock to be inserted into the shank of the bolt, to retain the bolt in the block. Once the bolt is tightened into the appropriate position, the padlock shackle is inserted into hole in the shank. The groove cooperates with the shackle and prevents the loosening of the bolt thereby preventing the release of the plug until the padlock shackle is removed.
REFERENCES:
patent: 3416123 (1968-12-01), Husebo
patent: 3422389 (1969-01-01), Husebo
patent: 4025140 (1977-05-01), Matys
patent: 4957446 (1990-09-01), Belsky
patent: 5055057 (1991-10-01), Bayer
patent: 5176527 (1993-01-01), Herbert
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