Tamperproof closures for wall-mounted receptacles and the like

Claim 1

In combination with a receptacle having a mouth, a closure member plugging said mouth so completely that nothing solid can be entered between said plug and receptacle; said closure plug being push-fitted in said mouth its perimetrical edge being in substantial frictional contact with the interior wall of the receptacle; the receptacle being provided with a relatively small aperture spaced from the bottom and adjacent said seat structure opening into the interior of the receptacle whereupon the insertion of the short leg of a stiff L-shaped pry through said aperture into the receptacle and subsequent manual swing of the distal end of the other end of the L-shape away from the receptacle, the distal end of the short leg will contact the underside of the closure plug and swing it to a tilted position so said closure plug is made accessible for removal; said pry acting as a bellcrank with its vertex bearing against the wall of said aperture as the fulcrum therefor, and a point on the perimeter of said plug opposite the location of said aperture, bearing against the seat and serving as the fulcrum for such swing to attain the tilted position of said plug; the outer surface of said plug being ungrippable when said plug is in closing position on said seat structure and said plug when in such closing position, being undeformable by hand pressure applied thereto.