摘要 |
<p>The locking member (13) is formed with a peg (15) and correspondingly, the top plate (2) is formed with a hole (16) to accept the peg, allowing the locking member to be fitted onto the plate in a peg-and-hole structure. Blocking members (24,25) on a slidable member (7) work together to prevent movement of slidable member until a releasing key is inserted below the slidable member.</p> |