Abstract: A cylinder lock having a non-rotatable part which is provided with an axially extending chamber and one or more recesses communicating with the chamber. A plug is arranged in this chamber for rotation about an axis, and a key is axially insertable into the plug. A number of tumblers are slidably mounted on the plug for movement transverse to the axis into and out of the recesses, the purpose of these tumblers being to prevent rotation of the plug when at least one of the tumblers extends into a recess. Each tumbler has an opening through which the key, when inserted into the plug, may extend. The tumblers are spring-biased for movement into positions where the tumblers are in a recess.

Abstract: A cylinder lock comprising an outer cylinder enclosing a hollow rotatable inner cylinder which, in turn, encloses a plurality of locking discs turnable with the key of the lock. Between the outer cylinder and the peripheral edges of the locking discs there is a locking bar locking the inner cylinder to the outer cylinder. This bar is movable from a position locking the inner cylinder, in which position the bar is located partly in a groove in the inner wall of the outer cylinder to a position releasing the inner cylinder. In the latter position the locking bar is received in a channel formed jointly by locking bar notches in the peripheral edges of the locking discs when the discs are brought to a certain position. The groove in the inner wall of the outer cylinder is provided with a lateral step, so that a deep groove portion and a shallow groove portion are formed.

Abstract: A disc cylinder lock comprising a number of turnable locking discs, which by turning of the key of the lock are turned from a certain initial position to a position releasing the lock mechanism. In the central part of some of the locking discs, there is an opening comprising two portions between which there are at least two substantially radial steps. One of the portions of the central opening receives the key of the lock while the other, when the key is properly inserted in the lock mechanism, forms at the side of the key a free space with a curved border, into which the key does not move in any of the functional phases of the lock. In front of the last mentioned locking discs, there is at least one other turnable element, for instance another type of locking disc, which has also, in its central part, an opening for the key.