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Patent Searching and Data


Title:
DOOR LOCK
Document Type and Number:
Japanese Patent JPH09203253
Kind Code:
A
Abstract:

To reduce number of part items of a door lock by retractably providing a stopper cam projected from the circumferential surface of a lock cam which rotates in association with a thumb turn knob in a rotating region of a rotation cam which is rotatable integrally with a lever handle.

A lock cam 52, which has a stopper cam 53 projecting from the circumferential surface thereof and rotates in association with a thumb turn knob, is provided in a rotation region of a rotation cam 8. For locking a door, the thumb turn knob is operated from the inside of the door. A lock bar 55 turns and the forward end of the cam 53 is engaged with the circumferential surface of the stop cam 12 to prevent the rotation of the cam 8. For releasing the door, the knob is turned in the opposite direction. The lock bar 55 turns in a direction opposite to the direction at the time of the locking. The forward end of the cam 53 is retracted from the circumferential surface of the stop cam 12 and the cam 8 becomes rotatable. If a lever handle is turned, the cam 8 rotates and a latch bolt 34 is retracted to open the door. As a result, an inexpensive door lock of simple construction can be obtained.


Inventors:
TAKAHASHI KOICHI
INOTSUME HIROMI
Application Number:
JP1996000013753
Publication Date:
August 05, 1997
Filing Date:
January 30, 1996
Export Citation:
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Assignee:
NAGASAWA SEISAKUSHO
International Classes:
E05B55/14; (IPC1-7): E05B55/14
Attorney, Agent or Firm:
Chiaki Takeshi