Movable or removable closures – Removable closure – Releasable means on closure
Patent
1979-04-12
1981-03-24
Downey, Kenneth
Movable or removable closures
Removable closure
Releasable means on closure
292173, 70144, E05C 2102
Patent
active
042571936
ABSTRACT:
A device is disclosed for locking a grate or the like to its receiving frame to make difficult the removal of the grate by an unauthorized person utilizing a makeshift tool. The locking device has a spring loaded latching pin carried by supports secured to the grate. The shoulders provided by either a necked portion of the latching pin or by a flange on the latching pin serve to prevent the unlatching of the latching pin against the biasing of the spring by the use of a makeshift tool. In some embodiments the shoulders are inclined at an angle with respect to the longitudinal axis of the latching pin to encourage the slippage of a makeshift tool off from said shoulders to thereby prevent the unlatching of the pin by an unauthorized person using a makeshift tool. In some embodiments, the unlatching hole in the grate is offset from the locking device to prevent the inspection of the locking device by an unauthorized person seeking to discover the manner of operation of the locking device.
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patent: 4142329 (1979-03-01), Williams
Deits David H.
Downey Kenneth
Mattern Jr. Roy E.
Moravan Gregory W.
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