Deadlock mechanism

Claim 1

A deadlock assembly for mounting in a closure member for locking the closure member to an associated frame, the assembly comprising: PG,13 (a) a casing including a facing plate provided with a bolt aperture, and having an inner wall portion circumscribing the aperture; (b) a bolt having a longitudinal axis and mounted within the casing for reciprocal movement along the longitudinal axis between an unlocked rearward position wherein the bolt is disposed within the casing and a locked forward position wherein the bolt extends out of the casing through the bolt aperture; (c) a pair of levers, the levers being disposed on opposite sides of the longitudinal axis, with each lever including a forward end provided with a locking ear and a rearward end provided with a camming lug spaced from the locking ear, the locking ear and camming lug extending laterally away from the longitudinal axis; (d) means for mounting the rearward end of each lever on the bolt for pivotal movement about an axis extending transversely of the longitudinal axis; (e) each camming lug being configured to define, when the bolt is moved to the unlocked rearward position, a longitudinal camming edge disposed substantially parallel to the longitudinal axis and a rearward inclined radial camming edge, the longitudinal and radial camming edges converging to form a cammng point for engaging the inner wall portion; and (f) a cam follower means disposed within the casing on either side of the levers and spaced from the inner wall portion, each cam follower means being positioned to engage the longitudinal camming edge of a corresponding camming lug for maintaining the longitudinal camming edge parallel to the longitudinal axis until the camming point engages the inner wall portion, thereby causing the locking ear to be moved away from the longitudinal axis when the bolt is moved towards the locked forward position.