ELECTRIC DROP BOLT WITH SLIDABLE DRIVE MECHANISM

摘要

ELECTRIC DROP BOLT WITH SLIDABLE DRIVE MECHANISM There is an electric motor driven drop bolt (2) having a housing (1) which in use is mounted into a doorway frame and has the bolt pivotal therein by a mechanical drive set in a cage (9) disposed at an operative position. The bolt is pivotal between a locking configuration where the bolt extends outward of the housing to engage in an aperture associated with a door within the frame and an unlocked configuration where the bolt is withdrawn to clear the aperture. The mechanical drive includes a screw shaft (5) rotatable by the electric motor (4) to move a roller nut (7) along the length of the shaft whilst engaging a cam surface (8) on the bolt. To obtain fail-safe operation of the drop bolt (2) the cage is slidable in the housing from the operative position to a disengaged position so that the bolt is movable from the locking configuration to the unlocked configuration without operation of the mechanical drive. Figure 1 ~