EP0712979B1 - Method and apparatus to lock and unlock a closing device - Google Patents

Description

The invention relates to a method and a device for locking and unlocking a locking device, in particular a locking device with one operated by a key Lock cylinder, which is a fixed, hollow Cylinder housing with a hollow inner cylinder that can be rotated inside and in this rotatable disc tumblers as well as one on it includes locking means arranged at the end.

From DE 38 13 658 is a lock cylinder with disc tumblers known. The lock cylinder comprises a housing, a cylinder drum and disc tumblers. It is one when you insert the key Non-rotating lock washer provided, the key opening non-rotatably cooperates with the key profile, so that the Key not twisted during insertion or removal can be. A control curve is provided on the key, through which the anti-rotation washer from the non-rotating position to a non-rotating position Position is transferred.

EP-A-0 622 508 discloses a locking device consisting of a Key and a lock cylinder with a cylinder core, which in a housing is rotatable and an axially extending channel for Inserting a key that has plate-shaped tumblers runs, which are arranged axially in succession, so that they in the cylinder core are rotatable, and includes the beard steps on the Key shafts are provided and the tumblers in one position can move, which releases a rotation of the cylinder core. The movement of the tumblers is a rotational movement around the axis of the Key shaft designed around, and their range of motion is through Attacks limited. There is at least one recess on the circumference of each tumbler provided, into which a locking means can enter that a rotation of the cylinder core releases.

Another locking device is from the DE 34 21 754 C2 known.

In a locking device of this type, for example the lock cylinder with its hollow inner cylinder and the Disc tumblers inserted into a blind hole in a housing. The cylinder lock has a rotatably mounted Hollow cylinder and in this a variety of limited rotation stored disc locks that can be turned with a key on. Between the disc tumblers are axial effective spring washers arranged. As a blocking agent is one cylindrical locking rod arranged. As long as the locking mechanism is in the locked position, a rotation of the inner Prevents cylinders with respect to the cylinder housing, and through the locking rod. This is with a Part in a in the inner surface of the cylinder housing recessed axial groove and with another part in a slot recessed in the circumference of the inner cylinder. When the disc tumblers with the key in the release position are rotated, form the recesses of the individual Disks jointly a groove in which the locking rod can occur, which unlocks the inner cylinder and the lock can be opened. The between the tumbler discs arranged spring washers each have a central cylindrical perforation, which is dimensioned so large that the corresponding key is passed through without contact can be.

Although such locks have proven their worth in the past have a disadvantage is that the individual disc tumblers by means of a not fully inserted Key can be rotated so that the user can accept must, the locking device is defective. With excessive The user can bend the key when applying force or cancel.

In addition, locks of this type are achievable Security due to a traceability that cannot be ruled out to be desired.

The object of the invention is a method and an apparatus specify which locking and unlocking a locking device improve, especially with regard to handling and security.

The task is set by the independent claims 1, 5, 6, 7, 10, 12, and 13 solved, particularly advantageous embodiments the invention are specified in the subclaims.

The functional and operational safety are increased by the coding of the individual steps for locking and unlocking a locking device, which is predetermined according to the invention.
In addition, an intentional and unintentional rotation of the disc tumblers relative to each other is impossible, for example, cannot be caused by vibrations or the like, or can be done by a key that is not fully inserted, or can be accomplished by wires or the like inserted into the keyhole. To actuate the locking device, it is necessary that the key is first completely inserted into the insertion channel, which is formed by the corresponding perforations in the disc tumblers. The second locking means, by means of which the inner cylinder with the cylinder housing was previously locked against relative rotation, is only unlocked when the key is fully inserted. The third locking means is then unlocked by turning the key slightly by a few degrees in the prescribed actuation direction, so that the disc tumblers can be rotated relative to the inner cylinder. The disk tumblers can then be rotated into the desired position by means of the key, in which the release position of the first locking means is reached. Upon further rotation, the locking means is then rotated by means of the key, so that the correspondingly equipped lock is adjusted to the open position. When the lock is closed, the key is turned in the opposite direction, the locking means being moved into the locking position in the opposite order.

The first locking means is preferably in the form of a locking rod conventional design, such as from the generic document known. The second blocking agent is preferably a double-acting with closing springs acted slide latch, which, for example, by the Tip of the inserted key in the unlocked position is moved against spring force. The third blocking agent can also be a cylindrical rod, pins, Balls or rollers. It is also an arrangement of several balls arranged in a row are possible, which then effectively represent a rod-shaped locking means.

Fig. 1

Eine Schließvorrichtung in Seitenansicht im Mittellängsschnitt gesehen;

Fig. 2

die Schließvorrichtung in Explosionsdarstellung;

Fig. 3

eine Variante in der Ansicht gemäß Figur 1;

Fig. 4 bis 7

unterschiedliche Stellungen der Schließvorrichtung im Schnitt A-A der Figur 3 gesehen;

Fig. 8 und 9

eine Einzelheit der Figur 3 im Schnitt C-C gesehen;

Fig. 10 bis 13

eine Variante der Schließvorrichtung in unterschiedlichen Stellungen entsprechend Figur 4 bis 7.

An embodiment of the invention is shown in the drawing and described in more detail below.
It shows:

Fig. 1

A locking device seen in side view in central longitudinal section;

Fig. 2

the locking device in an exploded view;

Fig. 3

a variant in the view of Figure 1;

4 to 7

different positions of the locking device seen in section AA of Figure 3;

8 and 9

a detail of Figure 3 seen in section CC;

10 to 13

a variant of the locking device in different positions corresponding to Figure 4 to 7.

The locking device consists essentially of a Cylinder lock with key 1, which is a fixed one Hollow cylinder housing 2 with limited rotation arranged hollow inner cylinder 3 and limited in this rotatable disc tumblers 4 and one on the inner cylinder 3 arranged at the end by means of the key 1 rotatable locking means 5 comprises. Furthermore, a first one Locking means 6 in the form of a cylindrical rod provided which the rotational movement of the closing means 5 relative to the cylinder housing 2 in one in the parting line of cylinder housing 2 and inner cylinder 3 mounted Position locks. The disc tumblers are 4 provided with circumferential recesses 7 arranged in this way, that the tumbler discs 4 on the matching Key 1 trained combination areas 8 through. Rotation of the inserted key 1 into a release position are rotatable, in which the first locking means 6 in the circumferential recesses aligned with one another 7 of the disc tumblers 4 enters and the inner cylinder 3 and the associated locking means 5 releases.

To avoid malfunctions there is a second one Locking means 9 are provided, by means of which the inner cylinder 3 lockable with the cylinder housing 2 against relative rotation and which is only through the fully inserted Key 1 is adjustable into the release position, in which the inner cylinder 3 relative to the cylinder housing 2 is rotatable. Furthermore, a third blocking means 10 provided, for example in the form of a cylindrical Rod, by means of which the disc tumblers 4 with the inner cylinder 3 can be locked against relative rotation, the third locking means 10 when the second is unlocked Locking means 9 by turning the key 1 in a Release position is transferable in the disc tumblers 4 are rotatable relative to the inner cylinder and when the key 1 is turned in the same direction The release position is maintained up to and including the Position in which the release position of the first Locking means 6 is reached.

The second locking means 9 is in the embodiment two at the end of the key insertion channel beyond the Disc tumblers 4 pushrods arranged, the transverse to the direction of insertion of the key 1 the tip of the key 1 from the locked position in the release position can be moved. The second Locking means 9 is contrary to the action of closing springs 11 adjustable in the release position.

The third locking means 10 is in the embodiment from a rod-shaped locking body, which in a axial recess 12 of the inner cylinder 3 radially and is axially immovable, the disc tumblers 4 to each other in the closed position of the device circumferential recesses 13 arranged in axial alignment have, in which the locking body (10) with a part of their cross-section and with their circumferential recesses 13 opposite area on the inner jacket of the cylinder housing 2. In the opening direction the disc tumblers 4 is immediately next to the Support areas 14 of the inner shell of the cylinder housing 2 a recessed (expanded radially outward) Provided circumferential area 15, which extends over a Rotation angle extends from about 90 °. In these radially the enlarged area 15 becomes the blocking means pushed, if the disc tumblers 4 together Inner cylinder 3 rotated a few more degrees are so that the locking means (10) is no longer in the peripheral recess 13 of the disc tumblers sits, but releases them. The recess 15 is in Circumferential direction so long that the locking means 10th unobstructed over the entire rotation of the Disc tumblers 4 remains in the free space 15, so that it is not in the joint between disc tumblers 4 and inner cylinder 3 enters.

The first locking means 6 points in the locked position in Viewed circumferential direction of rotation of the inner cylinder 3 Movement play on, in the embodiment Movement play on the cylinder housing 2, formed by a correspondingly wide axial recess 16, which Movement play is equal to or slightly greater than that Path of the tumblers 4 from the locked position in the release position of the third blocking means 10 equivalent.

The function of the first and third blocking means is based on the figure sequence of Figures 4 to 7 explained. In Figure 4 shows the locking position of both locking means. It is also at the end of the key insertion channel 17 one element each of the second blocking means 9 seen. These are the elements 18, the one across the top of the inserted key can be moved outward to the appropriate Effect unlocking. The third blocking means 10 is in this position in the longitudinal slot 12 of the hollow cylinder 3 and sits with part of it Circumference in the circumferential recess 13 of the disc tumbler 4. A partial area 14 is located radially on the outside cylindrical bore of the cylinder housing 2 so that the locking means 10 is not pushed radially outward can be. The first locking means 6 engages in one Axial slot 19 of the hollow inner cylinder 3 and protrudes beyond the outer alignment of the inner cylinder 3 in the corresponding recess 16 of the bore of the cylinder housing 2 a. That is in this position second locking means 9 engaged so that the inner cylinder 3 held non-rotatably relative to the cylinder housing 2 is. A rotation of the tumbler 4 means Key or by means of a wire or the like is not possible in this position.

Only when the key 1 in the insertion channel 17th is fully inserted and the release of the second locking means 9 has occurred (which will be done later ) it is possible to turn the Key the tumbler lock 4 including the inner cylinder 3 to rotate into the position shown in Figure 5 is. There is only a slight rotation in Direction of the movement arrow 20 (clockwise) until the locking means 10 in the area of the recess 15 of the cylinder housing 2 is shifted. In this position can the locking means 10 by rotating the disc tumbler 4 are moved outwards so that it is out the peripheral recess 13 of the tumbler 4 out is pushed radially outwards. As a result, the Disc tumbler 4 now relative to the inner cylinder 3 rotatable. The area of the Locking means 10 does not hinder this movement, since the Recess 15 over a corresponding peripheral area the bore of the cylinder housing 2 is formed. To corresponding rotation of the tumbler 4, as from 6 shows the peripheral recess 7 the disc tumbler 4 in the area of the locking means 6, which previously corresponds to the sequence of figures 4 and 5 in the radially widened recess 16 such extent has migrated in the circumferential direction, which the movement of the tumbler 4 and the Inner cylinder 3 from the locked position to the release position corresponds to the locking means 10. The Locking means 6 can then inward into the corresponding Recess 7, as shown in Figure 7 is, so that all disc tumblers 4 by means of corresponding key can be rotated and the inner cylinder 3 together with the locking part 5 is rotated, in the example by approx. 90 °.

The sequence of movements from transfer from the open position 7 in the closed position according to FIG. 4 analogous. 8 and 9, the second blocking means 9 in the locking position (Figure 8) and in the Unlocking position (Figure 9) shown. With not inserted key grip the ends 21 of the art a double slide bolt designed locking means 9 in corresponding recesses 22 of the cylinder housing 2, so that the inner cylinder 3 is held non-rotatably is. The bolt ends only become when the key is inserted 21 against the force of the closing springs 11 in one moved to the retracted position, behind the Circumferential alignment of the inner cylinder 3, so that this is rotatable relative to the cylinder housing 2.

An alternative is shown in the drawing figures 10 to 13 Embodiment shown, in which only two Locking means are arranged, but the training is made that with these two locking means only the desired functions can be reached.

The function of the locking means is based on the sequence of figures of Figures 10 to 13 explained.

The blocking position is shown in FIG. It is one element at the end of the key insertion channel 17 of the second locking means 9 can be seen. It is about thereby around the elements 18 through the tip of a inserted key are moved transversely outwards to effect the corresponding unlocking, as in the previous embodiments is described.

The first locking means 6 engages in an axial slot 19 of the hollow inner cylinder 3 and protrudes both the outer alignment of the inner cylinder 3 in the corresponding Recess 16 of the bore of the cylinder housing 2, as well as in a circumferential recess 7 Disc tumblers 4. The dimension is like this met that the locking means 6 not radially from this Position can be pushed away. In this position is the second locking means 9 in the Engagement position, so that the inner cylinder 3 relative to the Cylinder housing 2 is held non-rotatably. A Rotation of the disc tumblers 4 using a key or also by means of a wire or by means of vibration is not possible in this position.

Only when the key 1 in the insertion channel 17th is fully inserted and the release of the second locking means 9, it is possible to Turn the key in the direction of the movement arrow 20 (in the drawing clockwise) the disc tumblers 4 together with the inner cylinder 3 in one position twist, which is shown in Figure 11. It happens only a slight turn in the direction of the arrow 20 until the locking means 6 in the area of a radially outwardly widened channel 23 of the cylinder housing 2 is shifted. In this position it can Locking means 6 by turning the disc tumblers 4 to be moved radially outward so that it from the Circumferential recess 7 of the disc tumblers 4 out is pushed radially outwards. As a result, they are Disc tumblers 4 now relative to the inner cylinder 3 rotatable, the rotational movement of the inner cylinder 3rd by the active intervention of the locking means 6 between Inner cylinder 3 and cylinder housing 2 is blocked. With further rotation of the disc tumblers in the same direction 4 reaches a further circumferential recess 24 in the area of the blocking means 6, as in FIG. 12 seen. This circumferential recess 24 of the disc tumblers 4 is opposite the other circumferential recess 7 expanded radially inwards so that the locking means 6 can be displaced radially inwards so that it in the circumferential recess 24 and in the slot 19 of the Inner cylinder is located, but not over the External alignment of the inner cylinder protrudes. In this position can by means of the key 1 a common further Rotation of the tumblers 4 including the Inner cylinder 3 together with the locking part 5 until the The locking part is moved into the release position.

The sequence of movements from transfer from the open position 13 in the closed position according to FIG. 10 analogously vice versa. The function and training of the second Locking means 9 is also in this embodiment realized in the same way as the one before described embodiment.

Claims (13)

1. Method for locking and unlocking a locking device comprising an inner cylinder (3) rotatably arranged in a housing (2) and having a locking means (5) at one end, wherein a pack of rotatable disk tumblers (4) with peripheral cut-outs (7) is provided in the inner cavity of the inner cylinder (3), wherein the pack of rotatable disk tumblers (4) cooperate with combination surfaces (8) formed on a fitting key (1) in such a way that a first blocking means (6) acting between the housing (2) and the inner cylinder (3) first releases the inner cylinder (3), and thus the locking means (5), when a receiving recess for the first blocking means (6) has been provided by mutually aligned peripheral cut-outs (7) of the disk tumblers (4),
   wherein
   in addition to the blocking function of the first blocking means (6) a second and a third blocking function is provided between the housing (2), the inner cylinder (3) and the pack of disk tumblers (4) and an actuating code is determined by the three blocking functions; and wherein, through a longitudinal displacement and rotation of the key (1), an activation or deactivation of the blocking functions is brought about in a predeterminable sequence which corresponds to the respective code, and thus a locking or unlocking of the locking means (5).
2. Method in accordance with claim 1,
   characterized in that
   the second blocking function is provided between the housing (2) and the inner cylinder (3) and is activated or deactivated by longitudinal displacement of the key (1).
3. Method in accordance with claim 1,
   characterized in that
   the third blocking function is provided between the inner cylinder (3) and the housing (2) or between the inner cylinder (3) and the disk pack (4), and is activated or deactivated by turning of the key (1).
4. Method in accordance with claim 1,
   characterized in that
   the actuating code is selected in such a way that first of all the second blocking function between the housing (2) and the inner cylinder (3) is deactivated by longitudinal displacement of the key (1); in that the blocking function between the inner cylinder (3) and the disk pack (4) is then deactivated by a first partial turning of the key (1); and in that the blocking function between the inner cylinder (3) and the housing (2) is finally deactivated by a further turning of the key (1) with the simultaneous formation of an active connection between the key (1) and the inner cylinder (3), and in that the procedure is effected in the reverse sequence for the purpose of locking of the locking means (5).
5. Locking device comprising a key actuated lock cylinder which includes a stationary hollow cylinder housing (2) with a hollow inner cylinder (3) rotatable therein, with disk tumblers (4) rotatable in the inner cylinder (3) and also with a locking means (5) provided at the end of the inner cylinder (3) and rotatable by means of the key (1) as well as a first blocking means (6) which blocks- the rotary movement of the locking means (5) relative to the cylinder housing (2) in a position arranged in the parting joint between the cylinder housing (2) and the inner cylinder (3), wherein the disk tumblers are provided with peripheral cut-outs (7) and are arranged such that they are rotatable via combination surfaces (8) formed on the fitting key (1) by turning of the inserted key (1) into a release position in which the first blocking means (6) enters into the mutually aligned peripheral cut-outs (7) of the disk tumblers (4) and releases the inner cylinder (3) and also the locking means (5) associated therewith, wherein at least one second blocking means (9) is provided which is active between the inner cylinder (3) and the cylinder housing (2), with the second blocking means blocking the inner cylinder relative to the cylinder housing (2) against relative rotation and being adjoinable into the release position by the fully inserted key (1), and wherein a third blocking means (10) is provided by means of which the disk tumblers (4) and the inner cylinder (3) are blocked against relative rotation, wherein the third blocking means (10) are transferable, when the second blocking means (9) is unlatched by rotation of the key (1), into a release position in which the disk tumblers (4) are rotatable relative to the inner cylinder (3) and retain the release position with rotation of the key (1) in the same sense up to and including the position in which the release position of the first blocking means is achieved.
6. Locking device comprising a key actuated lock cylinder which includes a stationary hollow cylinder housing (2) with a hollow inner cylinder (3) rotatable therein, with disk tumblers (4) rotatable in the inner cylinder (3) and also with a locking means (5) provided at the end of the inner cylinder (3) and rotatable by means of the key (1) as well as a first blocking means (6) which blocks the rotary movement of the locking means (5) relative to the cylinder housing (2) in a position arranged in the parting joint between the cylinder housing (2) and the inner cylinder (3), wherein the disk tumblers are provided with peripheral cut-outs (7) and are arranged such that they are rotatable via combination surfaces (8) formed on the fitting key (1) by turning of the inserted key (1) into a release position in which the first blocking means (6) enters into the mutually aligned peripheral cut-outs (7) of the disk tumblers (4) and releases the inner cylinder (3) and also the locking means (5) associated therewith, wherein at least one second blocking means (9) is provided which is active between the inner cylinder (3) and the cylinder housing (2), with the second blocking means blocking the inner cylinder relative to the cylinder housing (2) against relative rotation and being adjoinable into the release position by the fully inserted key (1) and wherein for the provision of a third blocking function the first blocking means (6) is so arranged and designed that by means of the first blocking means (6) the disk tumblers (4) are also blocked with the inner cylinder (3) against relative rotation; in that the first blocking means (6) is transferable, when the second blocking means (9) is unlocked through turning of the key (1), into a release position in which the disk tumblers (4) are rotatable relative to the inner cylinder (3); and wherein, with rotation of the key (1) in the same sense, the first blocking means (6) retains this release position up to the position in the first blocking means (6) enters into the mutually aligned first peripheral cut-outs of the disk tumblers and releases the inner cylinder, and also the locking means connected to it, relative to the cylinder housing and connects them to the disk tumblers for joint rotation.
7. Locking device comprising a key actuated lock cylinder which includes a stationary hollow cylinder housing (2) with a hollow inner cylinder (3) rotatable therein, with disk tumblers (4) rotatable in the inner cylinder (3) and also with a locking means (5) provided at the end of the inner cylinder (3) and rotatable by means of the key (1) as well as a first blocking means (6) which blocks the rotary movement of the locking means (5) relative to the cylinder housing (2) in a position arranged in the parting joint between the cylinder housing (2) and the inner cylinder (3), wherein the disk tumblers are provided with peripheral cut-outs (7) and are arranged such that they are rotatable via combination surfaces (8) formed on the fitting key (1) by turning of the inserted key (1) into a release position in which the first blocking means (6) enters into the mutually aligned peripheral cut-outs (7) of the disk tumblers (4) and releases the inner cylinder (3) and also the locking means (5) associated therewith, wherein at least one second blocking means (9) is provided which is active between the inner cylinder (3) and the cylinder housing (2), with the second blocking means blocking the inner cylinder relative to the cylinder housing (2) against relative rotation and being adjoinable into the release position by the fully inserted key (1) and wherein the second blocking means (9) is formed by sliding bolts which are displaceable transverse to the direction of insertion of the key (1) by parts of the key or by the tip of the key (1) out of the blocking position into the release position.
8. Locking device in accordance with claim 5,
   characterized in that
   the second blocking means (9) is displaceable into the release position against the action of closing springs (11).
9. Locking device in accordance with claim 5,
   characterized in that
   the first and/or the third blocking means comprise one or more ball-like, roller-like or bar-like blocking members.
10. Locking device comprising a key actuated lock cylinder which includes a stationary hollow cylinder housing (2) with a hollow inner cylinder (3) rotatable therein, with disk tumblers (4) rotatable in the inner cylinder (3) and also with a locking means (5) provided at the end of the inner cylinder (3) and rotatable by means of the key (1) as well as a first blocking means (6) which blocks the rotary movement of the locking means (5) relative to the cylinder housing (2) in a position arranged in the parting joint between the cylinder housing (2) and the inner cylinder (3), wherein the disk tumblers are provided with peripheral cut-outs (7) and are arranged such that they are rotatable via combination surfaces (8) formed on the fitting key (1) by turning of the inserted key (1) into a release position in which the first blocking means (6) enters into the mutually aligned peripheral cut-outs (7) of the disk tumblers (4) and releases the inner cylinder (3) and also the locking means (5) associated therewith, wherein at least one second blocking means (9) is provided which is active between the inner cylinder (3) and the cylinder housing (2), with the second blocking means blocking the inner cylinder relative to the cylinder housing (2) against relative rotation and being adjoinable into the release position by the fully inserted key (1), wherein the third blocking means (10) is radially and axially non-displaceably arranged in an axial cut-out (12) of the inner cylinder (3), with the disk tumblers (4) having peripheral cut-outs (13) arranged in axial alignment with one another in the locked position of the device, and wherein a part of the cross-section of the blocking means engages into the peripheral cut-outs (13) and a region of the blocking means opposite to the peripheral cut-outs contacts the inner surface of the cylinder housing (2); and in that a recessed peripheral region (15) of the inner surface starts in the opening direction of rotation of the disk tumblers (4) directly adjacent the support regions (14) of the inner surface, with the blocking means (10) entering radially outwardly into the peripheral region (15) after rotation of the disk tumblers (4) and of the inner cylinder (3) through a few degrees of angle, and with the blocking means (10) remaining over the entire rotational path of the disk tumblers (4) in the peripheral region (15) so that it does not enter into the parting joint between the disk tumblers (4) and the inner cylinder (3).
11. Locking device in accordance with claim 5 to 10,
    characterized in that,
    in the blocking position, the first blocking means (6) has a clearance for movement, as seen in the peripheral direction of rotation of the inner cylinder (3), which is the same as or fractionally larger than the path of the disk tumblers (4) out of the blocked position into the release position of the third blocking means (10).
12. Locking device comprising a key actuated lock cylinder which includes a stationary hollow cylinder housing (2) with a hollow inner cylinder (3) rotatable therein, with disk tumblers (4) rotatable in the inner cylinder (3) and also with a locking means (5) provided at the end of the inner cylinder (3) and rotatable by means of the key (1) as well as a first blocking means (6) which blocks the rotary movement of the locking means (5) relative to the cylinder housing (2) in a position arranged in the parting joint between the cylinder housing (2) and the inner cylinder (3), wherein the disk tumblers are provided with peripheral cut-outs (7) and are arranged such that they are rotatable via combination surfaces (8) formed on the fitting key (1) by turning of the inserted key (1) into a release position in which the first blocking means (6) enters into the mutually aligned peripheral cut-outs (7) of the disk tumblers (4) and releases the inner cylinder (3) and also the locking means (5) associated therewith, wherein at least one second blocking means (9) is provided which is active between the inner cylinder (3) and the cylinder housing (2), with the second blocking means blocking the inner cylinder relative to the cylinder housing (2) against relative rotation and being adjoinable into the release position by the fully inserted key (1), wherein the cylinder housing (2) has a first axial channel (16) into which the first blocking means (6) partially engages in the blocked position, with the blocking means (6) passing through an axial gap (19) of the inner cylinder (3) and engaging into first axially aligned peripheral cut-outs (7) of the disk tumblers (4); and wherein the cylinder housing (2) has a second axial channel (23) adjoining the first axial channel (16) in the release direction of rotation of the disk tumblers (4), with the blocking means (6) engaging into the second axial channel (23) in an intermediate position in which the blocking means (6) releases the disk tumblers (4) but still engages in the axial gap (19) of the inner cylinder (3); and wherein the disk tumblers (4) have second peripheral cut-outs (24) in the release direction of rotation at a peripheral spacing from the first peripheral cut-outs (7), with the blocking means (6) engaging into the second peripheral cut-outs (24) in the release position and with the blocking means (6) thereby furthermore engaging into the axial gap (19) of the inner cylinder (3), but not projecting beyond its outer periphery.
13. Locking device comprising an inner cylinder rotatably arranged in a housing and having a locking means at its end, with a pack of rotatable disk tumblers being provided in the inner cavity of the inner cylinder and cooperating with combination elements formed on a fitting key in such a way that blocking means (6) acting between the housing and the inner cylinder (3) release the inner cylinder (3), and thus the locking means (5), when predeterminable relative positions are adopted between the disk tumblers and the housing, wherein at least two and preferably three individual blocking units are provided between the housing, the inner cylinder and the pack of disk tumblers, the sequence of actuation of which during the closing and opening procedure can be preset; and wherein the blocking units can be activated and deactivated in the respectively coded sequence by longitudinal displacement and turning of the key.

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