| 摘要 |
<p>A self-tightening side lock (20) for a roll-up door includes a keeper (25) mounted on the jamb, and a latch member (26) pivotally mounted on a door panel. The latch member is selectively cooperable with a catch (30) to hold the door in a closed position. The latch member is biased to move in a counter-clockwise direction. The latch member is adapted to be moved in a clockwise direction, against the opposing bias or a spring 42, to an out-of-the-way position at which the displaced latch may pass by the catch. The latch member has a side cam surface (33) arranged to engage the catch (30) when the door is lowered and to cause the latch member to pivot in a clockwise direction toward the out-of-the-way position to allow the latch member to pass by the catch. The latch member also has an upper cam surface (34) arranged to engage the catch such that the counter-clockwise movement of the latch member will cause the door to be self-tightening. A notch (50) extends radially into the latch member from the upper cam surface adjacent the side cam surface. The notch member is so configured and arranged as to receive the catch and to prevent further pivotal movement of the latch member. The improved side lock will thwart the efforts of a would-be thief who might attempt to force the door upwardly with the upper cam surface engaging the catch.</p> |
