Locks – Operating mechanism – Key
Patent
1997-12-17
1999-08-10
Barrett, Suzanne Dino
Locks
Operating mechanism
Key
70366, 70455, 70377, 70403, 70409, E05B 2908
Patent
active
059341211
ABSTRACT:
A lock apparatus includes a lock device and a coded key. The lock device has a lock shell and a cylindrical lock core unit received in the lock shell. The lock core unit has an axial key hole and is provided with a latch actuator. The key is extendible into the key hole and is operable so as to permit rotation of the lock core unit relative to the lock shell for moving the latch actuator from a locking position to an unlocking position. The key has a head portion and a shank portion which has a cross-section in the form of a circular sector with first and second planar surfaces that extend along length of the shank portion, and a curved surface that interconnects the first and second planar surfaces and that has an arc length greater than 180.degree.. The shank portion is formed with a plurality of key bit projections and key bit grooves on one of the first and second planar surfaces. The key bit projections and the key bit grooves have inclined actuating surfaces that form different angles to set code of the key. The angles are in a range from 0.degree. to about 180.degree..
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