| 摘要 |
PURPOSE: A lock state indicator is provided to confirm the locked state of a lock for a door when locking or unlocking the lock, thereby improving theft prevention effect. CONSTITUTION: A lock state indicator comprises a first member(120), a second member(130), a third member(140), and a fourth member(150). The first member has a hollow and is fixed to a key(110). The second member is accepted in the hollow and able to rotate relative to the first member. The third member contacts a protrusion of the second member so that the locked state of a lock is shown through a display. The fourth member increases the friction on the surface where the third member and the lock contact each other and fixes the third member so that a lock piece and the protrusion are engaged with each other.
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