AT523709B1 - Cylinder lock, key and locking device - Google Patents

Abstract

Cylinder lock with a cylinder core (2) rotatable in a housing (1) about an axis of rotation D, comprising a key channel (7) running in a radial plane R for the introduction of a coded key (3), wherein on one side of the key channel (7) a core pin guide (13) is provided, a core pin (6), preferably pretensioned by a spring (14), being provided in the core pin guide (13), the core pin (6) along its longitudinal axis (5) in the core pin guide (13) of a blocking position is displaceable into a release position, has a core side (8) pointing in the direction of the key channel (7) and designed to query a code on the key, a core side (8) pointing in the direction of the housing (1) and designed to engage in a housing recess (24) Has housing side (9), and is designed such that the rotation of the cylinder core (2) relative to the housing (1) is enabled when a key assigned to the cylinder lock (3) is inserted into the key channel (7), as well as the key (3) for such a cylinder lock and locking device.

Description

description

CYLINDER LOCK, KEY AND LOCKING DEVICE

The invention relates to a cylinder lock, a key and a locking device according to the preambles of the independent claims.

From the prior art, cylinder locks with a cylinder core rotatable in a housing about an axis of rotation D, comprising a key channel extending in a radial plane R, for introducing an encoded key (3) are known. Furthermore, such cylinder locks are known in which, in addition to the conventional core and housing pins extending in the radial plane R, further core pins are provided which run in a core pin guide on the side of the key channel, i.e. outside the radial plane R. For example, the document EP 2 886 754 A2 shows such a cylinder lock.

A disadvantage of such cylinder locks, however, is that the outside of the radial plane R extending core pins must be moved a long distance due to their eccentric positioning relative to the cylinder core in order to protrude sufficiently into the housing so that a secure locking effect can occur. The further the core pin is offset from the axis of rotation D, the further it has to be moved by the key in order to ensure sufficient extension into the housing. As a result, core pins of this type can only be actuated on the key with comparatively large increments, so that the number of variations on the key is low.

The object of the invention is to overcome the disadvantages of the prior art. In particular, it is the object of the invention to create a cylinder lock in which a sufficient locking effect can be achieved even by small increments on the key. The object of the invention is, among other things, to create a cylinder lock which is constructed as simply as possible and can be manufactured at low cost.

The object according to the invention is achieved in particular by the features of the independent claims.

A cylinder lock according to the invention comprises a cylinder core rotatable about an axis of rotation D in a housing, comprising a key channel extending in a radial plane R for the introduction of an encoded key.

On one side of the key channel at least one outside of the radial plane R extending core pin guide is provided. This can be a substantially cylindrical bore or the like.

In the core pin guide, a core pin is provided which can be displaced along its longitudinal axis in the core pin guide from a blocking position into a release position. The core pin is designed in such a way that the rotation of the cylinder core with respect to the housing is enabled when a key assigned to the cylinder lock is inserted into the key channel. This can be achieved in that a substantially cylindrical gap (also referred to as a parting plane) is formed between the cylinder core and the housing, which the core pin blocks or releases depending on the coding of the key. The core pin may be spring biased in the core pin guide; however, this is not mandatory.

The core pin is preferably of substantially cylindrical shape and comprises a facing in the direction of the key channel and formed for querying a code on the key core side, and a facing in the direction of the housing and designed to engage in a housing recess on the housing side.

According to the invention, at least two locking sections projecting differently in the direction of the longitudinal axis, each with a locking surface extending essentially normal to the longitudinal axis, are provided on the housing side of the core pin. In other words, the

The housing side of the core pin is not linear, but is essentially stepped.

This ensures that - depending on the offset of the core pin and the core pin guide relative to the axis of rotation - the housing side can be designed such that even a slight displacement of the core pin can lead to a significant blockage of the cylinder core in the housing.

It can be provided that blocking surfaces protrude beyond the cylinder core in the blocking position. In the blocking position of the core pin, the blocking sections preferably protrude at least partially, preferably completely, into the housing recess.

The locking surfaces of the core pin are preferably flat, smooth and / or without elevation. If necessary, a transition area can be arranged between the blocking sections, which in particular runs obliquely to the longitudinal axis of the core pin.

According to the invention it can be provided that in the blocking position at least one locking surface of the core pin protrudes into the housing recess, so that movement of the cylinder core relative to the housing is prevented, and in the release position the core pin releases the movement of the cylinder core relative to the housing. In the release position, the core pin can be arranged in the cylinder core, in particular without protruding and / or completely.

For the purposes of the invention, the term that one side is step-shaped can be understood to mean a side which comprises at least two steps, which are optionally spaced apart by a transition region.

The core pin guide can extend transversely, preferably normal to the radial plane R of the cylinder core and preferably be arranged offset to the axis of rotation D of the cylinder core.

The offset of the core pin guide can be, for example, half, a third, a quarter or a fifth of the radius of the cylinder core. Due to the stepped design of the housing side of the core pin, the offset can be particularly large and it can even be provided that two or more core pins are arranged in one quadrant of the cylinder core cross section.

The core pin can be essentially cylindrical, but have a non-circular cross-section so that it cannot be rotated in the core pin guide. In particular, the core pin can have a shoulder that extends radially outward in sections and is designed to interact positively with a stop in the core pin guide in order to limit the displacement of the core pin in the core pin guide in the direction of the cylinder core.

In order to limit the movement of the core pin in the core pin guide in the direction of the housing, it can be provided that the housing recess has a smaller cross section than the core pin guide so that the core pin can only penetrate into the housing recess with its locking sections, i.e. the locking surfaces .

The core pin can comprise a release device which is designed such that the core pin is displaced in the core pin guide from the blocking position to the release position when a key assigned to the cylinder lock is inserted into the keyway. The release device can preferably be magnetizable and particularly preferably comprise a permanent magnet which is designed to interact with a magnetic coding on the key.

By interacting with the release device, the core pin can be moved essentially in the direction of its longitudinal axis in the core pin guide. In particular, the release device and the core pin can interact in such a way that the core pin is moved in the direction of the keyway or in the direction of the housing, whereby the rotation of the cylinder core relative to the housing is released.

The release device can be arranged in a, preferably designed as a blind hole, recess of the core pin, which is particularly preferably on the core side of the core

pen, so adjacent to the key channel, is arranged. The blind hole can preferably be formed symmetrically about the longitudinal axis of the core pin.

On the core side of the core pin, a first control surface can be provided, which is flat and runs essentially normal to the longitudinal axis of the core pin. Furthermore, a second control surface can be provided on the core side of the core pin, which control surface is curved or arched along the longitudinal axis.

The first control surface on the core side of the core pin can form a first circular ring section. The second control surface on the core side of the core pin can form a second circular ring section. Both circular ring sections can cover the outer circumference of the core side of the core pin. The control surfaces can in particular be arranged concentrically around the recess, preferably the blind hole. The control surfaces can preferably be designed to be offset in steps along the longitudinal axis, so that the second control surface extends further in the direction of the keyway than the first control surface.

The second control surface can in particular be designed as a bar-shaped scanning extension for scanning a slot-shaped coding on the key. This can make it possible to further increase the security of the cylinder lock, since the key must be set up to move the core pin and have a coding that can interact with the control surface of the core pin. If necessary, the core pin is only moved by the interaction of the key and the control surface.

A housing pin which is prestressed by a spring and interacts with the core pin can be provided in the housing recess. The housing pin can be designed in such a way that it forms a dividing plane between the cylinder core and the housing and releases this when a key assigned to the cylinder lock is inserted into the key channel.

At least one spacer plate can be provided between the core pin and the housing pin, so that the rotation of the cylinder core relative to the housing is released in two or more positions of the core pin. In other words, the spacer plates allow the formation of two or more independent planes of division. This makes it possible, in particular, to use key systems with different key hierarchies for actuating the cylinder lock.

In particular, it is provided that the spacer plate is also displaced by displacing the core pin. Depending on the hierarchy of the key, the at least one core pin, in particular its housing side, or the at least one spacer plate is brought into a position in which the cylinder core can be rotated relative to the housing.

Preferably, the side of the housing of the at least one core pin, the side of the housing of the at least one spacer plate or the interface between the at least one core pin and the at least one spacer plate is aligned with the parting line (dividing plane) between the cylinder core and the housing, so that, if necessary, a rotation of the cylinder core relative to the Housing is possible.

According to the invention it can be provided that the spacer plate is essentially cylindrical with a longitudinal axis, an end core side and an opposite housing side. The core side can rest on the core pin and the housing side on the housing pin or on another spacer plate. The core side can be positively engaged with the housing side of the core pin. In this case, the core side can preferably be designed essentially step-shaped by providing on the core side at least two blocking surfaces which protrude along the longitudinal axis to different extents, run essentially normal to the longitudinal axis and are optionally connected by a transition area.

At least one blocking surface of the at least one spacer plate can preferably be flat, smooth and / or without elevation. The steps on the core side of the spacer

Chens can be formed by the at least two blocking surfaces. A transition area can be arranged between the at least two blocking surfaces of the core side of the spacer plate, which in particular runs at an angle to the longitudinal axis of the spacer plate.

The spacer plate, in particular its core and / or housing side, is preferably designed such that the spacer plate, in particular with the core pin, in particular with the housing side of the core pin, and / or a further spacer plate can be positively connected.

The core side of the spacer plate can essentially correspond to the housing side of the core pin. The housing side of the spacer plate can essentially correspond to the core side of a further spacer plate. The housing side of the spacer plate can, however, not be stepped, but rather curved, inclined or rounded.

Due to the positive connection, the spacer plate can be guided together with the core pin. It can thereby be achieved that the spacer plate is non-rotatable and can be moved in the direction of its longitudinal axis.

Of course, the cylinder lock can also have further query elements for querying any codes on the key.

The invention also relates to a key for a cylinder lock according to the invention, the key having at least one preferably magnetic coding which is designed such that the core pin is moved from the blocking position to the release position when the key is inserted into the keyway. Of course, the key can also have other codings.

The invention also relates to a locking device with a cylinder lock according to the invention and a key according to the invention.

Further features according to the invention may emerge from the claims, the description of the exemplary embodiments and the figures.

The invention will now be explained further using the example of exemplary, non-exclusive and / or non-restrictive exemplary embodiments.

FIGS. 1a and 1b show a schematic representation of a first embodiment of a cylinder lock according to the invention;

Figures 2a and 2b show a schematic representation of a first embodiment of a core pin according to the invention,

Figures 3a and 3b show a schematic representation of a second embodiment of a core pin according to the invention,

Figure 4 shows a schematic representation of a spacer plate,

Figures 5a and 5b show a schematic representation of a section of a second embodiment of a cylinder lock according to the invention.

1a and 1b show a schematic graphic representation of a first embodiment of a cylinder lock according to the invention, with part of FIG. 1a being shown enlarged in FIG. 1b. The cylinder lock comprises a housing 1 and a cylinder core 2 rotatably mounted therein. According to this illustration, a key 3 is inserted into the key channel 7 of the cylinder lock.

The key channel 7 extends in a radial plane R through the axis of rotation D of the cylinder core 2 and has a core pin guide 13 in which a core pin 6 is displaceably arranged. The core pin guide 13 is arranged approximately normal to the radial plane R and eccentric to the axis of rotation D with an offset of about one third of the cylinder core radius from the axis of rotation D. In other words, the core pin guide 13 leads laterally and above the axis of rotation D transversely from the housing 1 through the cylinder core 2 into the key channel 7.

In this illustration, the core pin 6 is shown in its release position. In this release position, the core pin 6 is arranged without protruding inside the cylinder core 2.

As a result, in the release position, the dividing surface between the cylinder core 2 and the housing 1 is free and a rotation of the cylinder core 2 with respect to the housing 1 is possible. The core pin 6 can be brought from this release position into its blocking position, whereby a rotation of the cylinder core 2 with respect to the housing 1 is blocked.

According to this embodiment, the core pin 6 comprises an essentially cylindrical base body on which a shoulder 21 is arranged. The shoulder 21 is set up to interact with the cylinder core 2, in particular with a stop 23 in the core pin guide 13, so that the movement of the core pin 6 along its longitudinal axis 5 is limited.

According to this embodiment, the core pin 6 has a core side 8 and a housing side 9, which are opposite one another. The core side 8 of the core pin 6 points in the direction of the key channel 7 and is designed to query a code on the key 3. The housing side 9 of the core pin 6 points in the direction of the housing 1 and is designed to engage in a housing recess 24.

According to this embodiment, the core side 8 of the core pin 6 has first and second control surfaces 18, 19. The control surfaces 18, 19 are set up to query a coding, in particular an incision milling, on a side surface of the key 3. The first control surface 18 is designed in the form of a web-shaped scanning element which extends over the second control surface 19. The control surfaces 18, 19 of the core side 8 of the core pin 6 run essentially normal to the longitudinal axis of the core pin 6 and are essentially flat.

According to this embodiment, the housing side 9 of the core pin 6 is step-shaped. The steps on the housing side 9 of the core pin 6 are formed by two locking sections 4, each of which has a locking surface 10 that is essentially perpendicular to the longitudinal axis 5 of the core pin 6. A contact surface 22 is provided adjacent to the blocking sections 4.

The housing recess 24 has a smaller cross section than the core pin guide 13, so that the core pin 6 can only penetrate into the housing recess 24 with its locking sections 4, that is to say the locking surfaces 10. The further movement of the core pin 6 in the direction of the housing 1 is limited by the fact that the contact surface 22 on the housing side 9 of the core pin 6 hits the inner circumference of the housing 1.

The core pin 6 comprises a release device 11 which is designed such that the core pin 6 is moved from the blocking position into the release position when a key 3 assigned to the cylinder lock is inserted into the key channel 7. According to this embodiment, the release device 11 is designed as a permanent magnet which is arranged in a blind hole 12 on the core side 8 of the core pin 6.

Figures 2a and 2b show schematic representations of an embodiment of a core pin 6 ‘according to the invention in a side view and a sectioned representation. This core pin 6 ° ‘is a different embodiment than the core pin 6 shown in FIGS. 1a and 1b, although their features can preferably correspond.

The core pin 6 'of this embodiment is essentially cylindrical, but has a non-circular cross-section due to a radially outwardly extending shoulder 21. This shoulder 21 serves to limit the movement of the core pin 6' in the core pin guide 13 by it strikes against a stop 23 in the core pin guide 13.

The end face of the core pin 6 'has a core side 8 pointing in the direction of the key channel 7 and designed to query a coding on the key and a housing side 9 pointing in the direction of the housing 1 and designed to engage in a housing recess 24 are two different in the direction of the longitudinal axis 5

Far protruding blocking sections 4 are provided, each of which has a blocking surface 10 running essentially normal to the longitudinal axis 5.

The housing side 9 is thus designed in a stepped manner, the blocking surfaces 10 forming the steps. A short transition area 20 is provided between the blocking surfaces 10.

The core pin 6 ‘comprises a release device 11 which comprises a permanent magnet which is designed to interact with a magnetic coding on the key 3. The release device 11 is arranged in a blind hole 12 of the core pin 6 ‘, which is arranged on the core side 8 of the core pin 6‘. The blind hole 12 is arranged essentially centrally and along the longitudinal axis 5 of the core pin 6 and delimited by an annular section of the core side 8. This annular section forms a first control surface 18.

Figures 3a and 3b show schematic representations of a second embodiment of a core pin 6 according to the invention in a side view and in a three-dimensional view. This embodiment of the core pin 6 is the core pin 6 shown in FIGS. 1a and 1b.

The core pin 6 is in turn essentially cylindrical with a non-circular cross-section due to a radially outwardly extending shoulder 21. The core pin 6 has a core side 8 and 8 pointing in the direction of the key channel 7 and designed to query a code on the key a housing side 9 pointing in the direction of the housing 1 and designed to engage in a housing recess 24. The housing side 9 is thus designed step-shaped, the blocking surfaces 10 forming the steps. A short transition area 20 is provided between the blocking surfaces 10.

In contrast to the embodiment according to FIGS. 2a and 2b, in this exemplary embodiment not only the housing side 9, but also the core side 8 is essentially step-shaped.

This is achieved in that a first control surface 18 is provided on the core side 8 of the core pin 6, which control surface 18 is flat and runs essentially normal to the longitudinal axis 5 of the core pin 6. In addition, a second control surface 19 is provided on the core side 8, which is designed to be curved along the longitudinal axis 5. The first and second control surfaces 18, 19 are arranged concentrically around the blind hole 12, that is to say form its delimitation or edge. The first control surface 18 forms a first circular ring section of the core side 8, and the second control surface 19 forms a second circular ring section of the core side 8. The first and second control surfaces 18, 19 are offset in steps along the longitudinal axis 5. In this exemplary embodiment, the second control surface 19 is formed over an angular range of less than 180 ° and thus forms a web-shaped scanning pin, which is designed for insertion into a corresponding notch on the key 3.

4 shows a schematic representation of a spacer plate 15 according to the invention. The spacer plate 15 is essentially cylindrical with a longitudinal axis 25, an end core side 16 and an opposite housing side 17. The length of the spacer plate 15 is preferably less than its diameter. The core side 16 is essentially step-shaped by providing on the core side 16 at least two blocking surfaces 10 which protrude along the longitudinal axis 25 to different extents, extend essentially normal to the longitudinal axis 25 and are connected by a transition region 20. The transition area 20 between the two steps of the core side 16 preferably runs obliquely to the longitudinal axis 25. In other exemplary embodiments, however, other shapes of the transition area 20, such as part of a circular arc, are also provided. In this embodiment, the housing side 17 is not stepped, but linear and inclined to the longitudinal axis 25.

Figures 5a and 5b show schematic representations of a further embodiment

form of a cylinder lock according to the invention. The features of the embodiment according to FIGS. 5a and 5b can preferably correspond to the features of the embodiments according to FIGS. 1a, 1b, 2a, 2b, 3a, 3b and / or 4.

In this embodiment, a housing pin 26 which is prestressed by a spring 14 and interacts with the core pin 6 is provided in the housing recess 24. The spring 14 presses the core pin 6 in the direction of the key channel 7. The spring 14 is arranged in the housing recess 24. The housing pin 26 is designed in such a way that it releases a dividing plane between the cylinder core 2 and the housing 1 when a key 3 assigned to the cylinder lock is inserted into the key channel 7.

A spacer plate 15 is provided between the housing pin 26 and the core pin 6, the core side 16 of the spacer plate 15 resting against the core pin 6 and the housing side 17 resting against the housing pin 26. The core side 16 of the spacer plate 15 is therefore in positive engagement with the housing side 9 of the core pin 6. As a result, two independent dividing levels are formed in this embodiment, so that two differently coded keys can block the lock.

According to this embodiment, the spacer plate 15 lies with its core side 16 in a form-fitting manner on the housing side 9 of the core pin 6 and is connected to the core pin 6 in a form-fitting manner due to the stepped design of these sides. Due to the positive connection, the spacer plate 15 is guided in the housing recess 24 and can be moved without twisting along its longitudinal axis 25.

In FIG. 5a, the core pin 6 is in a position in which the separating surface between the core pin 6 and the spacer plate 15 is aligned with the separating line between the cylinder core 2 and the housing 1, so that the cylinder core 2 can be rotated relative to the housing 1 . In FIG. 5b, the core pin 6 is in a position in which the housing side 17 of the spacer plate 15 is aligned with the parting line between the cylinder core 2 and the housing 1, so that the cylinder core 2 can also be rotated relative to the housing 1. This configuration can be provided in all embodiments.

The invention is not limited to the illustrated embodiments, but includes any cylinder lock, any key and any locking device according to the following claims.

REFERENCE LIST

1 housing

2 cylinder core

3 keys

4 locking section

5 Longitudinal axis of the core pin 6, 6 ‘core pin

7 key channel

8 Core side of the core pin

9 Housing side of the core pin 10 locking surface

11 Release device

12 Blind hole 13 Core pin guide 14 Spring

15 spacer plates

16 Core side of the spacer plate

17 Housing side of the spacer plate 18 First control surface

19 Second control surface

20 transition area

21 Shoulder 22 Contact surface on the housing side of the core pin 23 Stop

24 housing recess 25 longitudinal axis of the spacer plate 26 housing pin

Claims (16)

Claims 1. Cylinder lock with a cylinder core (2) rotatable in a housing (1) about an axis of rotation D, comprising a key channel (7) extending in a radial plane R for the introduction of a coded key (3), - With at least one core pin guide (13) extending outside the radial plane R being provided on one side of the key channel (7), ) is displaceable in the core pin guide (13) from a blocking position to a release position, o has a core side (8) pointing in the direction of the key channel (7) and designed to query a code on the key, o a core side (8) pointing in the direction of the housing (1) and has the housing side (9) designed to engage in a housing recess (24), and is designed such that the rotation of the cylinder core (2) relative to the housing (1) is enabled when a key (3) assigned to the cylinder lock is inserted Key channel (7) is inserted, characterized in that on the housing side (9) at least two locking sections (4) projecting differently in the direction of the longitudinal axis (5) each with a he blocking surface (10) running essentially normal to the longitudinal axis (5) are provided, so that the housing side (9) is essentially step-shaped. 2. Cylinder lock according to claim 1, characterized in that the core pin guide (13) extends transversely, preferably normal to the radial plane R of the cylinder core (2) and is preferably arranged offset to the axis of rotation D of the cylinder core (2). 3. Cylinder lock according to claim 1 or 2, characterized in that the core pin (6, 6 ‘) has a non-circular cross-section and is not rotatable in the core pin guide (13). 4. Cylinder lock according to one of claims 1 to 3, characterized in that the core pin (6, 6 °) comprises a release device (11) which is designed such that the core pin (6, 6 °) in the core pin guide (13) is shifted from the blocking position to the release position when a key (3) assigned to the cylinder lock is inserted into the key channel (7), the release device (11) comprising a permanent magnet which is designed to interact with a magnetic coding on the key (3) is. 5. Cylinder lock according to one of claims 1 to 4, characterized in that in the blocking position at least one locking surface (10) of the core pin (6, 6 °) protrudes into the housing recess (24), so that a movement of the cylinder core (2) relative to the Housing (1) is prevented, and in the release position the core pin (6, 6 ') releases the movement of the cylinder core (2) relative to the housing (1). 6. Cylinder lock according to claim 4 or 5, characterized in that the release device (11) is arranged in a recess of the core pin (6, 6 °) preferably designed as a blind hole (12), which is particularly preferably on the core side (8) of the core pin (6, 6 ') is arranged. 7. Cylinder lock according to one of claims 1 to 6, characterized in that a first control surface (18) is provided on the core side (8) of the core pin (6, 6 '), which is flat and essentially normal to the longitudinal axis (5) of the core pin (6, 6 °). 8. Cylinder lock according to one of claims 1 to 7, characterized in that on the core side (8) of the core pin (6, 6 ‘) a second control surface (19) is provided which is curved along the longitudinal axis (5). 9. Cylinder lock according to claim 8 in combination with claim 7, characterized in that the first control surface (18) forms a first circular ring section of the core side (8), and the second control surface (19) forms a second circular ring section of the core side (8), wherein the control surfaces (18, 19) are designed to be offset in steps along the longitudinal axis (5). 10. Cylinder lock according to claim 9 in combination with claim 6, characterized in that the control surfaces (18, 19) are arranged concentrically around the recess, preferably the blind hole (12). 11. Cylinder lock according to one of claims 1 to 10, characterized in that the core pin (6, 6 °) has a substantially cylindrical cross section with a shoulder (21) which extends radially outward in sections and is designed with a stop (23) cooperate positively in the core pin guide (13) in order to limit the displacement of the core pin (6, 6 °) in the core pin guide (13). 12. Cylinder lock according to one of claims 1 to 11, characterized in that a housing pin (26) which is pretensioned by a spring (14) and cooperates with the core pin (6, 6 °) is provided in the housing recess (24) and is designed in this way is that it releases a dividing plane between the cylinder core (2) and the housing (1) when a key (3) assigned to the cylinder lock is inserted into the key channel (7). 13. Cylinder lock according to claim 12, characterized in that between the core pin (6, 6 ') and the housing pin (26) at least one spacer plate (15) is provided so that the rotation of the cylinder core (2) relative to the housing (1) in two or more positions of the core pin (6, 6 ') is released. 14. Cylinder lock according to claim 13, characterized in that a. the spacer plate (15) is essentially cylindrical with a longitudinal axis (25), a core side (16) and a housing side (17), b. the core side (16) rests on the core pin (6, 6 ‘) and the housing side (17) rests on the housing pin (26) or on another spacer plate (15), c. wherein the core side (16) is positively engaged with the housing side (9) of the core pin (6, 6 °), and preferably d. the core side (16) is essentially stepped in that on the core side (16) at least two blocking surfaces ( 10) are provided. 15. Cylinder lock according to claim 14, characterized in that the housing side (17) of the spacer plate (15) is not stepped, but curved, inclined or rounded. 16. Locking device with a cylinder lock according to claims 1 to 15 and a key (3), characterized in that the key (3) has at least one magnetic coding which is designed to interact with the release device (11). In addition 5 sheets of drawings