| 摘要 |
A door lock comprising a first thin plate having connecting channels secured to the side wall of the door jamb and a second thin plate having corresponding connecting channels secured to the side wall of the door adjacent its swinging edge in position for registration of its connecting channels with those of the first thin plate when the door is in its closed position. A locking pin is received through the connecting channels of both plates when they are brought into registration with each other to thereby hold the door in its closed position until the locking pin is withdrawn. The outwardly facing surface of the first plate secured to the door jamb and the surfaces of its connecting channels which face toward the swinging edge of the door when in its closed position are preferably coplanar to prevent those surfaces of the first plate's connecting channels from protruding into the swinging path of the door as it is opened and closed. The connecting channels may be cylindrical in cross-section to receive a cylindrical pin. They may also be angular in cross-section to received a pin of corresponding angular cross-section such as square or triangular. Selected ones of the connecting channels may have a different cross-sectional configuration than adjacent ones, and the locking pin may have correspondingly configured cross-sectional segments to require precise alignment by pre-determinable rotation of the locking pin to insert and withdraw. The locking pin can thereby not be withdrawn without knowing how to properly rotate for the correct alignment.
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