Cylinder lock

Details Cylinder lock Cylinder lock

1996-08-27

1999-08-10

Boucher, Darnell M.

Locks

Operating mechanism

Key

70377, 70392, 70464, E05B 2700

Patent

active

059341246

ABSTRACT:
A lock piece is provided in the inner part of a tumbler. Size of a clearance formed between the side of a lock groove engaging portion of the lock piece and the side of a lock groove is determined to be smaller than size of a clearance formed between the side of a lock condition holding portion of the tumbler and the side of a lock groove. When the key is inserted being given a torque in the rotating direction, the lock groove engaging portion is engaged with the side of the lock groove, and the lock condition holding portion of the tumbler is maintained to be separate from the side of the lock groove. Due to the foregoing, the lock condition holding portion is prevented from being caught on the side of the lock groove.

REFERENCES:
patent: 1725557 (1929-08-01), Baird
patent: 1805891 (1931-05-01), Shinn
patent: 1906701 (1933-05-01), Maxwell et al.
patent: 1958603 (1934-05-01), Bacon
patent: 1969012 (1934-08-01), Jacobi
patent: 1990934 (1935-02-01), Falk
patent: 3713311 (1973-01-01), Oliver et al.
patent: 4320639 (1982-03-01), Kleefeldt et al.
patent: 4399674 (1983-08-01), Tsai
patent: 4400954 (1983-08-01), Nakamoto et al.
patent: 4644768 (1987-02-01), Nowak et al.
patent: 5134871 (1992-08-01), Makino et al.
patent: 5653131 (1997-08-01), Shibata et al.

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