To provide a door lock with a lock function capable of automatically unlock the lock even if a latch bolt is locked by an erroneous operation in a state when a door opens.
A lock mechanism 30 for holding a latch bolt 14 in a locked state includes: an elevating stopper member 31 which opposes at a front and rear to a rear surface of a tip part of a cam arm 20 retreating the latch bolt in a descending stop state to prevent the cam arm from oscillating toward a release direction of the cam arm; a release arm 32 which integrally moves with the latch bolt; and a lock cam 35 which is able to oscillate between a lock position where it is oscillated by a rotational operation of a locking/unlocking operation key of a thumb turn or a cylinder lock and the oscillating side end faces a retreating region of the release arm 32 and a lock release position where the lock cam is pressed by retreating the release arm at the lock position to be oscillated upward and retreats upward from the retreating region and which moves the stopper member upward when being oscillated upward.
| JP2012214977 | LOCK DEVICE |
| JP3099058 | Polygon thumb turn |
YAMADA KEISUKE
| JPH11182116A | 1999-07-06 | |||
| JP2010024781A | 2010-02-04 | |||
| JP2003003711A | 2003-01-08 | |||
| JPH09165958A | 1997-06-24 |
Higashio Masahiro
Takayoshi Tagawa