| 摘要 |
A multipoint door lock has a latch-bolt, head- and sill-bolts and a dead bolt. A handle on the inside of the door operates a follower 19 for retracting the latch-bolt 18 if turned in one direction, whilst rotation in the opposite direction causes the head- and sill-bolts to be shot. Dead-bolt 21 is shot by means of cylinder lock L having a radial projection 57 which first lifts a plate bearing pin 31 then engages surface 65 in a cut-out in the bolt to drive it outwards and then releases the plate. This also causes pin 31 to travel up limb 64, along straight 63 and down limb 66 of an inverted U-shaped slot in the lock casing, so providing a detent to hold the bolt in its end positions. The dead-bolt operation may occur before or after operating the head- and sill-bolts. A night-latch 20 is provided to prevent withdrawal of the dead-bolt by a key, but is operable only when the head- and sill-bolts are in their fastening positions. <IMAGE> |
