| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an elevator entrance door lock device capable of grasping that it is the timing for cleaning the dust stacked on a guide rail.SOLUTION: An elevator entrance door lock device comprises: a rotatable hook 11 disposed at the entrance of an elevator and having a recess 11a opened downward; and a lock piece 13 having a projection 13a made engageable with the recess 11a of that hook 11, wherein a landing door 1 is locked in a closed state by causing the projection 13a of the lock piece 13 to engage with the recess 11a of the hook 11. When a gap 40, which is formed on the inner side of the curved shape of the projection 13a of the lock piece 13 and which is formed between the recess 11a of the hook 11 and the projection 13a of the lock piece 13, changes into a size different from the normal one, a block 20 generates a strange sound accompanying the rotational motion of the hook 11, that is, a sliding sound or a beating sound.</p> |
