Cylinder lock--key--combination

Details Cylinder lock--key--combination Cylinder lock--key--combination

1994-02-25

1996-02-13

Boucher, Darnell M.

Locks

Operating mechanism

Key

70406, 70409, 70392, E05B 2902

Patent

active

054904056

ABSTRACT:
A disc cylinder lock mechanism comprises a cylinder housing, an inner cylinder turnable inside the cylinder housing, and a stack of discs inside the inner cylinder. The discs define respective key openings which form a key channel for receiving a key. The stack of discs includes several locking discs, and the lock mechanism is in a releasing condition when each locking disc is in a predetermined releasing angular position. Each locking disc has a protrusion that extends toward the central part of the key opening and has first and second adjacent and substantially perpendicular edges. A guiding element extends longitudinally over the stack of discs in the key channel. The key has a combination surface for each locking disc and is formed to engage the guiding element when the key is inserted in the key channel for turning the guiding element continuously with the key when the key is turned in the lock. When the key is inserted in the key channel and is turned in one direction, the combination surfaces engage the first edges of the respective locking discs to bring each locking disc to its respective predetermined angular releasing position, and when the key is turned in the opposite direction the guiding element engages the second edges of the respective locking discs to bring each locking disc to a key removal position.

REFERENCES:
patent: 2217047 (1940-10-01), Fitz Gerald
patent: 3789638 (1974-02-01), Robert et al.
patent: 4127996 (1978-12-01), Malminen et al.
patent: 4320639 (1982-03-01), Kleefeldt et al.
patent: 4686843 (1987-08-01), Martikainen et al.
patent: 5131248 (1992-07-01), Ho

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