Cylinder lock

A cylinder lock comprising:

• a lock body having an interior surface formed with first and second grooves,
• a rotatable lock cylinder inside the lock body, the lock cylinder being formed with first and second slots,
• a plurality of locking discs enclosed by the lock cylinder, each locking disc having a key engagement surface that is engaged when the key of the lock is inserted in the lock and is turned, and also having a peripheral locking notch that is at one of six angular positions relative to the key engagement surface of the disc, the six angular positions all being within an angular range of 90.degree. and being at an angular pitch of 18.degree. within said angular range, and each locking disc also having a set of six second peripheral notches arranged side by side outside said angular range at an angular pitch of about 18.degree.,
• a locking bar, which in the locked position of the lock is located partly in the first groove in the lock body and partly in the first slot in the lock cylinder and thereby prevents turning of the lock cylinder relative to the lock body,
• an auxiliary bar, which in the locked position of the lock is located partly in the second groove in the lock body and partly in the second slot in the lock cylinder, the set of second peripheral notches of each locking disc being arranged in cooperation with said auxiliary bar so that when the locking discs are turned in the opening direction of the lock, said auxiliary bar and said second peripheral notches prevent turning of the locking discs relative to each other at the end phase of the turning movement before the locking bar moves into its position for releasing the lock, and said auxiliary bar being continuously located partly inside the lock cylinder so that it limits the turning range of the locking discs, and
• at least one member continuously turning with the key and arranged to guide radial movement of the auxiliary bar.

A cylinder lock comprising:

• a lock body having an interior surface formed with first and second grooves,
• a rotatable lock cylinder inside the lock body, the lock cylinder being formed with first and second slots,
• a plurality of locking discs enclosed by the lock cylinder, each locking disc having a key engagement surface that is engaged when the key of the lock is inserted in the lock and is turned, and also having a peripheral locking notch that is at one of a predetermined number of permitted angular positions relative to the key engagement surface of the disc, the permitted angular positions all being within a predetermined angular range and being at a predetermined angular pitch within said angular range, said plurality of locking discs comprising first and second sets of locking discs, and each locking disc of the first set having a set of second peripheral notches arranged side by side and located outside said predetermined angular range, the number of second peripheral notches in each locking disc of the second set being equal to said predetermined number and the angular pitch between the second peripheral notches being substantially equal to said predetermined angular pitch, and the second set of locking discs comprising at least one O-locking disc having a peripheral relief of which the tangential extent corresponds to the tangential extent of the set of second peripheral notches in each locking disc of the first set,
• a locking bar, which in the locked position of the lock is located partly in the first groove in the lock body and partly in the first slot in the lock cylinder and thereby prevents turning of the lock cylinder relative to the lock body, and
• an auxiliary bar that is guided radially by the second set of locking discs and which in the locked position of the lock is located partly in the second groove in the lock body and partly in the second slot in the lock cylinder, the set of second peripheral notches of each locking disc of the first set being arranged in cooperation with said auxiliary bar so that when the locking discs are turned in the opening direction of the lock, said auxiliary bar and said second peripheral notches prevent turning of the locking discs of the first set relative to each other at the end phase of the turning movement before the locking bar moves into its position for releasing the lock, and said auxiliary bar being continuously located partly inside the lock cylinder so that it limits the turning range of the locking discs.