Locks – Operating mechanism – Key
Patent
1992-12-18
1994-03-15
Gall, Lloyd A.
Locks
Operating mechanism
Key
70366, 70495, 70496, E05B 2904
Patent
active
052937640
ABSTRACT:
A safety lock for house doors and the like, adapted to be operated by a key having a front active profile (3), comprises an outer drum member (4), a cylindrical body (9) rotatably mounted with respect to the drum member and arranged within the latter and a number of safety plates (29) having notches (29a), housed internally to a cavity (13) of the cylindrical body and pivotally mounted around a pin (30). A tab (27) prevents, when the lock is locked, the rotation of the cylindrical body (9) with respect to the drum member (4). By inserting the key in the keyhole, the safety plates reach a reciprocal position which is such that the notches (29a) define a seat which receives the tab (27) thereby unlocking the lock. A cam member (33), which is tiltalble around the pin (30) and is urged by a spring (24), brings the tab back in the locking position when the key is withdrawn. By the oscillating arrangement of the safety plates (29) and the cam member (33), a lock of reduced axial bulk is obtained.
REFERENCES:
patent: 419091 (1890-01-01), Williams
patent: 671326 (1901-04-01), Soley
patent: 2036747 (1936-04-01), Fitzgerald
patent: 3604231 (1971-09-01), Buschi
patent: 3733863 (1973-05-01), Toepfer
Gall Lloyd A.
Mottura Serrature Di Sicurezza S.p.A.
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