Cylinder lock device

Details Cylinder lock device Cylinder lock device

2005-08-31

2008-09-09

Barrett, Suzanne D (Department: 3673)

Locks

Operating mechanism

Key

C070S359000, C070S494000, C070S409000

Reexamination Certificate

active

07421869

ABSTRACT:
Tumbler pins2are movably housed in a plug1. A locked/unlocked state is determined by the turning position on the moving direction center axes of the tumbler pins2. An unlocking key4to be inserted into the plug1is provided with unlocking code forming recesses3for determining the turning positions of the tumbler pins at code decision positions. The tumbler pins2are provided at their leading end portions with drive portions5, which have slope sides of conical faces gradually reduced in diameter toward the leading ends and having rotational centers offset from the moving direction center axes. The side wall faces of the unlocking code forming recesses3are formed of conical faces having rotational centers substantially aligned with those of the conical faces forming the slope sides of the drive portions5. At code decision positions, the slope sides of the drive portions5are forced to contact with the side wall faces of the unlocking code forming recesses3thereby to determine the turning positions of the tumbler pins2.

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