| 摘要 |
<p>TITLE OF THE INVENTION IMPROVED LOCK OF THE DEAD BOLT TYPE A door lock of the dead bolt type in which an eccentric cam on the inner end of a look cylinder can be rotated to engage a deformation in a ring, causing the ring to rotate. A linkage connects the ring to a bolt so that rotation of the ring causes reciprocation of the bolt, the ring being concentric with and supported by the cylinder. An engagement portion of the ring that extends beyond the cylinder forms the deformation, preferably a recess, permitting the cam to engage and disengage the recess as it makes a complete revolution. The cam engages opposite ends of the recess to move the bolt in opposite directions. A spring, that can be disposed within the bolt, is used to bias the ring toward positions corresponding to extended and retracted positions of the bolt. A catch mechanism can be provided to engage a housing and resist movement of the bolt is the bolt is forced toward its retracted position.</p> |
