Security-door lock

摘要

The lock has tumblers actuated directly by the key, also a catch engaging with the bolt and actuated via the lug of an additional profiled cylinder and a changeover lever (sic) driven via the tumbler mechanism. The cylinder is secured in the housing by a screw actuated via an opening in the lock cover-plate (sic). A slide on the side of the cover plate towards the lock housing is movable between positions covering and exposing the access opening. Where the tumbler mechanism is changed over by a tool passed through an opening in the plate, the slide can be arranged to cover and expose this opening also.