Locks – Operating mechanism – Key
Patent
1982-08-23
1985-03-12
Smith, Gary L.
Locks
Operating mechanism
Key
70417, 70424, 70455, 292DIG2, E05B 1714
Patent
active
045036926
ABSTRACT:
A protective doorknob encasement device which provides a protective cover over the space formed between a door jamb and an exterior doorknob to prevent insertion of a tool to forcibly open the door. The invention includes a mounting plate and a track guide to enable slidable attachment of a protective casement. The track guide is configured so as to orient and restrict movement of the casement along the track and only in a direction toward the exterior door surface. Removal of the casement is permitted by its continued forward motion along the track and is only possible when the door is open. This unidirectional forward motion results from use of spring-biased pawls coupled to the casement which catch in corresponding grooves set in the mounting plate to prevent rearward motion. An opening is provided in the casement in alignment with a key slot of the enclosed doorknob to permit normal access.
REFERENCES:
patent: 2458002 (1949-01-01), Kaskouras
patent: 3210972 (1965-10-01), Johnson
patent: 3444712 (1969-05-01), Greenwald
patent: 3660996 (1972-05-01), Syvertson
patent: 3696646 (1972-10-01), Loscalzo
patent: 3976318 (1976-08-01), Krus
patent: 4084414 (1978-04-01), Martin
patent: 4106315 (1978-08-01), Dohanyos
patent: 4127967 (1978-12-01), Franzl
patent: 4254931 (1981-03-01), Aikens et al.
Illich Russell W.
Smith Gary L.
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