Latch guard

Details Latch guard Latch guard

1976-03-10

1977-03-08

Moore, Richard E.

Closure fasteners

Bolt guards

340274R, E05C 112

Patent

active

040109682

ABSTRACT:
In a latch guard which has a mounting flange mountable in overlying relation to the inner face of a jamb in the vicinity of keeper means located on the jamb, and a blocking flange integrally fixed along one edge of the mounting flange substantially at right angles thereto, the improvement wherein a portion of the blocking flange projecting along and beyond the full length of a recess formed in the mounting flange in a direction away from a door has a plurality of toothed segments formed therein. The latch guard further includes a conductive plate which lies in the second plane paralleling the first plane and is normally spaced therefrom in a direction away from the door. At least one non-conductive compression spring is interposed between the plate and the blocking flange to urge the plate in a direction away therefrom. The stop and the jamb are formed with first and second recesses, respectively to receive blocking flange, the spring and the plate. The blocking flange and the plate are formed with projections facing one another, respectively; the blocking flange is conductive, and the flange and the plate are electrically connected to an intruder-warning system. Upon an intruder attempting to selectively jam a prying tool between the jamb and the stop, or between the door and the stop, the projections are electrically connected to one another and actuate warning means.

REFERENCES:
patent: 2660632 (1953-11-01), Makishima
patent: 3392999 (1968-07-01), Thompson

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