| 摘要 |
PROBLEM TO BE SOLVED: To make a door body 1, which can be freely opened and closed being installed at an opening for an inspection door or the like; to have a lock to be opened by rotating an operation tool T which is inserted in a gap S between a door-body front-end face plate 1d and the opposite end-face of a door frame 2 and put into an operation shaft 9, and to be forcibly put in an initial open state, so that not to have any lock device exposed on the door-body front face, but still to be closed to a locked state with a mere closing operation of the door body 1 when the door body 1 is being closed.SOLUTION: An operation body 13, which opens a door body 1 by projecting with effect of a lock-opening operation of an operation tool T and by contacting an inclined guide 14d on a latch-receiving 14 side, is arranged to automatically return to an original attitude when the operation tool T is pulled out from an operation shaft 9, so that the operation body 13 does not hinder closing action. |
