Locks – Operating mechanism – Key
Patent
1987-05-11
1989-10-24
Gall, Lloyd A.
Locks
Operating mechanism
Key
70400, 70401, 70454, E05B 1908
Patent
active
048753521
ABSTRACT:
The invention comprises a two part key which replaces a conventional key in a conventional lock cylinder for purpose of temporary use wherein one of the parts is a plastic or similar material insert which replaces a portion of the conventional key and a short conplementary key which permits operation of the lock in conjunction with the insert. The insert being secured in the cylinder by means of the cylinder locking pins and being removable only by means of a special installation and extraction tool.
REFERENCES:
patent: 420174 (1890-01-01), Taylor
patent: 660230 (1900-10-01), Treat
patent: 917365 (1909-04-01), Schoell
patent: 1417148 (1922-05-01), Diesel et al.
patent: 1587686 (1926-06-01), Varnum
patent: 1662613 (1928-03-01), Laynor
patent: 1728310 (1929-09-01), Sundel
patent: 1900185 (1933-03-01), Long
patent: 1979798 (1934-11-01), Glidden
patent: 2591652 (1952-04-01), Ziegliss
patent: 2945373 (1960-07-01), Powers
patent: 3243979 (1966-04-01), Silvern
patent: 3267707 (1966-08-01), Adams
patent: 3276233 (1966-10-01), Russell et al.
patent: 3338078 (1967-08-01), Eberitch et al.
patent: 3408942 (1968-11-01), Barnes et al.
patent: 3475934 (1969-11-01), Reisner
patent: 3714804 (1973-02-01), French
patent: 4120184 (1978-10-01), Gerlach
Bettger Richard R.
Smallegan Jon M.
Gall Lloyd A.
Schlage Lock Company
Vliet Walter C.
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