Anti-theft plug and fastener

Details Anti-theft plug and fastener Anti-theft plug and fastener

1982-02-22

1984-09-25

Hall, George T.

Receptacles

Closures

With closure opening arrangements for means

220288, B65D 1752, B65D 4326

Patent

active

044731698

ABSTRACT:
Disclosed are plugs and fasteners which deter unauthorized removal through the use of rotationally symmetric engagement recesses. The invention also provides special tools with projections complementary to the plug and fastener recesses and thereby permit easy removal of the plugs and fasteners without damage. An exemplary embodiment of an inventive plug contains a two-stage recess in lieu of the standard hexagonal head; each of the recess stages is rotationally symmetric, and the two stages have non-coinciding symmetry axes. The rotational symmetry of the recess stages defeats any attempt to remove an inserted plug by forcing commonly available tools, such as hex or square drivers and blade or Phillips screwdrivers, into the recess. An inventive tool for use with this embodiment has a two-stage projection complementary to the recess.

REFERENCES:
patent: 2179045 (1939-11-01), Lewis
patent: 3912116 (1975-10-01), Chahley

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