| 摘要 |
PROBLEM TO BE SOLVED: To obtain a lock structure in which the breaking of an engaging section between a cylinder lock and a lock box by a slender plate or the like inserted into a key hole can be prevented. SOLUTION: In the lock structure in which an external cylinder 61 for the cylinder lock 31 in which an internal cylinder 41 can be rotated to the external cylinder 61 externally inserted to the internal cylinder 41 by an unlocking by inserting a duplicate key 63 into a key hole 43 for the internal cylinder 41 is fixed onto the lock box installed in a door, a rotary output plate 69 rotated at the same center as the rotary center CL1 of the internal cylinder 41 is projected from the rear end face 41a of the internal cylinder 41 and the rotary operating physical force of the internal cylinder 41 is input to the lock box by engaging the plate 69 with a rotary input member 71 for the lock box, a through-hole 73 is bored to the plate 69, and at least one protective plate 75 closing the rear-end opening of the key hole 43 opened to the rear end face 41a of the internal cylinder 41 is mounted in the through-hole 73.
|
