lock with key actuated box notched laminar slides - uses inboard box wings in notches casing bore rib to stop rotation box when at rest

摘要

The lock incorporates a box of notched superimposed plates in a cylindrical housing, and is actuated by an inserted key which aligns the notches. The box can now be pushed axially in to engage and rotate a lantern, the assembly inc. security mechanisms which prevent both rotation and retraction of the box when at repose. A round hollow section mounting spigot with external and internal radial flanges may house into the inboard housing extremity, the internal flange being notched to locate cut and folded radial box wall wings. This arrangement prevents box rotation, the location of the wings in the notches being ensured by a coil spring which bears on an inboard centring washer to force the box towards the keyhole. Box retraction may be prevented by locating the washer behind a housing bore shoulder.