Abstract: A permutation lock wherein a locking bolt is reciprocable in a housing between extended and retracted position. The housing contains a set of coaxial tumblers rotatable by a cam having a lobe which can move the bolt to extended position through the medium of a coupling lever which is pivotally connected with the bolt. The coupling lever can be pivoted to an operative position, in which it extends into the path of movement of the lobe on the cam, only when at least one of the tumblers is moved from a predetermined position in which a notch in its peripheral surface is out of alignment with similar notches in the peripheral surfaces of the other tumblers. The bolt is movable to the retracted position by a locating lever which is pivoted to the bolt and has a pallet receivable in a recess of the lobe only when all of the notches are aligned with each other so that they can receive a finger which is provided on the locating lever and extends in parallelism with the common axis of the tumblers.

Abstract: A time lock usable with a lock mechanism having a bolt displaceable along a path for opening a door has a housing which is fixed adjacent the path and in which a keeper is vertically displaceable between an uppermost blocking position, a lowermost unblocking position, and an intermediate position. A clockwork in the housing displaces a lock slide horizontally from a holding position wherein a recess in this lock slide is out of alignment with a dog pivoted in the housing into a freeing position with the recess and dog aligned after elapse of a predetermined interval of time. This locking dog is carried on a locking pawl which is connected via a shortenable link to the vertically displaceable keeper. When the clockwork displaces the lock slide into the freeing position the keeper automatically drops into the intermediate position, with the dog entering upwardly into the recess in the lock slide.