To lock and unlock a door by opening-closing operation by a handle, in a aluminum sash glass door.
This door side locking device has a sickle 3 fixed to a doorway vertical frame side latch on an end surface. A fork 23 on the tip of an arm 22 interlocking with the handle 1, rotates the sickle to a fixing position by driving a lock bolt 33 to the sickle rotatable between the fixing position and a neutral position. A locking state is maintained by setting repulsive force of a lever spring 11 of the handle turning in the fixing direction, larger than the repulsive force of a return spring 31 of the sickle. A spring 36 for returning to its opening position, is arranged on a lock lever 35 to the sickle. The door can be locked by moving to its opening position by pressing the lock lever by pushing-in operation of a trigger 4, and the door can be opened by locking on its position by the lock lever by returning the sickle to the neutral position by separating the fork from the lock bolt by operating the handle in the opening direction of the door.
KOMIYA CHIEKO
TAKAI ISHIYUKI
