| 摘要 |
<p>A lock device includes a body (1) having a lock core (11) mounted in it, a protective plate (2) fixedly secured to the body and including a slot (22) having a side recess (23) defined in it. The flat key (3) includes a reduced neck (33) formed in its upper end. The protective plate covers the lock core except a keyway of the lock core. The neck has a length greater than a thickness of the protective plate, and the neck is moved into the side recess when the key is rotated.</p> |
