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Title:
CYLINDER LOCK
Document Type and Number:
Japanese Patent JP2010168741
Kind Code:
A
Abstract:

To provide a cylinder lock highly resistant to an illegal unlocking operation.

This cylinder lock includes a plug 2 which is inserted into a cylinder case 1 in such a manner that its shaft-length-direction movement is regulated, and a sleeve 4 which is inserted into the cylinder case 1 in the state of being externally suitable for the plug 2 in such a manner as to be incapable of idly running and movable in the shaft length direction and which enables a push-in operating physical force to be imparted by an unlocking key 3 for being inserted into the plug 2. An appropriate number of tumblers 5, which open/close a shaft-length-direction movement boundary formed between the tumbler 5 and the sleeve 4 and which are driven to a movement boundary opening position by the proper unlocking key 3, so as to permit the movement of the sleeve 4 in the shaft length direction, are attached to the plug 2; and the operation of pushing in the sleeve 4 to the push-in position from an initial one can be performed.


Inventors:
IGATA MAKOTO
Application Number:
JP2009009990A
Publication Date:
August 05, 2010
Filing Date:
January 20, 2009
Export Citation:
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Assignee:
ALPHA CORP
International Classes:
E05B15/00; E05B29/04
Domestic Patent References:
JPS50106798A1975-08-22
JPH0324571U1991-03-13
Attorney, Agent or Firm:
Masao Yamakawa
Kawaoka Hideo



 
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