Closure fasteners – Bolt guards
Patent
1978-01-13
1979-10-23
Foss, J. Franklin
Closure fasteners
Bolt guards
70418, E05B 1700
Patent
active
041718372
ABSTRACT:
Burglary-resistant apparatus for denying access to door locks through a door crevice is adapted for mounting on a doorjamb adjacent one or more door locks and comprises a vertically elongate blocking plate disposed over the crevice between the doorjamb and a door, which includes flat surface portions extending over marginal portions of the door and substantially into a groove within the doorjamb thereby making it especially difficult to gain access to the crevice by circumventing the blocking plate. A vertically elongate locking plate has one vertical edge thereof secured to the blocking plate and extends perpendicularly therefrom to form a rigid structural unit having a generally T-shaped cross section. The locking plate is adapted to be secured to the doorjamb adjacent the door crevice and cooperates with the edge of the blocking plate seated within the groove of the doorjamb to provide particularly rigid mounting of the blocking plate to prevent dislodgement of the latter even under the influence of burglary tools.
REFERENCES:
patent: D34243 (1901-03-01), Taylor
patent: 2127891 (1938-08-01), Starling
patent: 3290081 (1966-12-01), Sushan
patent: 3377094 (1968-04-01), Thompson
patent: 3392999 (1968-07-01), Thompson
patent: 3405962 (1968-10-01), Sushan
patent: 3963269 (1976-06-01), Rosenberg
patent: 3976318 (1976-08-01), Krus
patent: 4010968 (1977-03-01), Rehfeld
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