Cylinder lock

Details Cylinder lock Cylinder lock

1990-02-05

1991-08-20

Wolfe, Robert L.

Locks

Operating mechanism

Key

70377, E05B 2902

Patent

active

050403923

ABSTRACT:
A cylinder lock has an external cylinder member and an internal cylinder member inserted in the external member. Further it has an elevatable plate provided with its lower end protruding in a key slot axially formed in the internal cylinder member and a stopper placed on the top arc periphery of the elevatable plate. A key adapted to be used exclusively for exchanging or removing the internal cylinder member is used in a situation that the key is lost and another key having another key code is necessary to use in place of the old key. When the lock is to be opened, the key to be exclusively used to remove the internal cylinder member is inserted into the key slot and the elevatable plate is raised together with the stopper, so that the stopper is disengaged from the internal cylinder member.

REFERENCES:
patent: 1990934 (1935-02-01), Falk
patent: 2000829 (1935-05-01), Falk
patent: 2059695 (1936-11-01), Jacobi
patent: 2059698 (1936-11-01), Jacobi

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