Title:
RETAINING DEVICE FOR THUMB-TURN SHAFT IN LOCK
Document Type and Number:
Japanese Patent JP3963992
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent locking and release by the fault or intention of a third person by conducting the operation of a thumb-turn for a cylinder lock only by a specific person such as a janitor by inserting and retracting an inner key.
SOLUTION: The indoor-side end section of the operating member 5 of the cylinder lock 3 is bent in a U shape, and an engaging piece 53 is formed and rocked with rotation between the releasing place and locking place of the thumb-turn shaft 2 by operating a thumb-turn 21. The engaging piece 53 is constrained at the locking place or the releasing place by a control piece 6 urged so as to occupy the place of engagement by a compression spring 62 under normal conditions, in which an inner key 8 is inserted into an inner-key inserting path 71 in a lock box 1, and the rotary operation of the thumb-turn shaft 2 by the thumb-turn cannot be conducted. The retaining and constraint of the engaging piece 53 by the control piece 6 is released by inserting the inner key 8 into the inner-key inserting path 71 through the opening 17 of the lock box 1 by a janitor, etc., normally holding the inner key, and the thumb-turn shaft can be turned by the thumb-turn 21.
Inventors:
Kawaguchi Katsumi
Application Number:
JP1477297A
Publication Date:
August 22, 2007
Filing Date:
January 10, 1997
Export Citation:
Assignee:
Miwa Lock Co., Ltd.
International Classes:
E05B17/00; E05B17/20; E05B13/00; E05B63/12; E05B63/14; E05B65/08; (IPC1-7): E05B17/20; E05B17/00
Domestic Patent References:
| JP7048915Y2 | ||||
| JP59027513Y2 | ||||
| JP6001210Y1 | ||||
| JP1086661U | ||||
| JP63201174U |
Attorney, Agent or Firm:
Takeo Iida
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