To eliminate a disadvantage that a latch member projects from a front plate of a lock case on the occasion of opening a door and the door can not be closed consequently and to make the door open only to this side where an operation member is operated or to the other side of the operation, according to the purpose.
A latch member 3 composed of an upper rotating latch 3a and a lower rotating latch 3b is provided in a lock case 5 and, besides, a latch member projecting-withdrawing mechanism X having latch locking-unlocking means 7 and latch withdrawing-holding means 9 is provided in the lock case 5. This latch withdrawing-holding means 9 are constituted of triggers 32 which are so provided for the latch member 3 that sliding contact head parts 35 are brought into pressure contact with a support metal fitting 2 by the resilience of spring members 31 at the time of closing of a door so that the state of the latch member 3 withdrawn in the lock case 5 can be maintained against the resilience of a latch spring 8 on the occasion when the door 4 is opened and of latch projection stoppers 33 which are provided movably for the triggers 32 and engage the latch member 3 withdrawn in the lock case, in linkage with the triggers 32, on the occasion when the door is opened.
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