EP0623719A2 - Locking cylinder, key and keyblank sets for groups of locking cylinders - Google Patents

Abstract

In a lock cylinder (10), the keyway (16) and correspondingly also the key shank (18) each have a near-breast profile region (B) with an axis-parallel near-breast mid-plane (BM) and a near-spine profile region (R) with an axis-parallel near-spine mid-plane (RM). Notches (20) are worked into the near-breast profile region (B) from the breast edge face (18b). In the basic rotational position (key-insertion and key-withdrawal position), the near-spine mid-plane (RM) forms an acute angle (- alpha ) with the tumbler plane (Z), whilst the near-breast mid-plane (BM) coincides essentially with the tumbler plane (Z). <IMAGE>

Description

The invention relates to a lock cylinder with a key, the key shaft of which is designed with a shaft profile having a chest edge surface, a back edge surface and side surfaces, at least one of the side surfaces being profiled by longitudinal ribs and / or longitudinal grooves, said lock cylinder comprising a lock cylinder housing with a cylindrical housing bore and one in the housing bore rotatably accommodated cylinder core with a core axis and a key channel running essentially parallel to the core axis and adapted to the shaft profile,
wherein the lock cylinder housing has in at least one tumbler plane approximately containing the core axis substantially radially to the core axis housing pin bores for receiving radially inwardly spring-loaded housing pins of tumbler pin pairs and the lock cylinder core has core pin bores for receiving core pins, which core pin bores in a basic rotational position of the cylinder core (key insertion position and key removal ) aligned with the housing pin holes,
the key channel and accordingly also the key shaft each have a profile area near the chest with an axially parallel chest plane and a back profile area with an axially parallel back plane,
wherein further from the chest edge in the breast near profile area notches are incorporated, which cooperate with the inner ends of the core pins such that they control contact surfaces between the core pins and the housing pins in a cylindrical interface between the housing bore and the cylinder core in the basic rotational position, and
the central plane close to the back encloses an acute angle with the tumbler plane in the basic rotational position of the cylinder core.

Such a locking cylinder is known from DE-A-25 46 550. Reference is made there in particular to FIG. 6.

In the known embodiment, the key shaft is assigned essentially the entire height of a central plane common to the back profile area and the chest profile area. The notches are cut in the breast near-profile region so as to enclose the locking row of a 90 ^o angle different. This angle can vary. This should make it difficult to imitate the key on known copying machines. Furthermore, used longitudinal groove profiles should be able to be used again practically by the inclination of the key shank in relation to the tumbler level.

The invention is based on the object of specifying a locking cylinder which opens up further possibilities for individualizing locking cylinders and associated keys against one another using a predetermined profile with longitudinal ribs and / or longitudinal grooves.

It is proposed according to the invention
that - again in the basic rotational position - the chest plane near the chest essentially coincides with the tumbler plane and that the notches are delimited by notch areas which are preferably essentially orthogonal to the chest plane near the chest.

• a) dieser spitze Winkel ein positives Vorzeichen haben kann;
• b) dieser spitze Winkel bei unveränderter Nuten- bzw. Rippenprofilierung ein negatives Vorzeichen haben kann;
• c) das Profil bei positivem Vorzeichen des Winkels in bezug auf die Zuhaltungsebene gespiegelt sein kann und
• d) das Profil bei negativem Vorzeichen des spitzen Winkels in bezug auf die Zuhaltungsebene gespiegelt sein kann.

When using a locking cylinder according to the invention, there is the possibility of further individualization insofar as a given amount of the acute angle

• a) this acute angle can have a positive sign;
• b) this acute angle can have a negative sign with unchanged groove or rib profiling;
• c) the profile can be mirrored with a positive sign of the angle with respect to the tumbler plane and
• d) the profile can be mirrored with a negative sign of the acute angle with respect to the tumbler plane.

In addition, the respective amount of the angle can be varied, but care should be taken that the angle difference between mutually adjacent angle values is at least approximately 5 ° in order to rule out the risk that a user might force a key into the key channel of an unrelated one Tried to insert the lock cylinder.

The amount of the acute angle can vary, for example, between approximately 5 ° and approximately 16 °, wherein three different angle values can preferably be selected within this range. In addition, the angle value 0 is also available for individualization, at which the mid-level near the chest and the mid-level near the back coincide. Another individualization option is to design the individual ribs and grooves with different cross-sectional dimensions in the direction parallel to the respective central plane and perpendicular to the respective central plane for a given basic profile.

A particular advantage of the design of a locking cylinder and the associated key according to the invention is that a basic profile, once recognized as advantageous and determined by the arrangement and cross-sectional shape of its ribs and grooves, enables a very large number of locking variations, both for individual locking and for locking as part of locking systems.

Accordingly, the invention further relates to a group of lock cylinders, each with a key, the Key shaft is designed with a shaft profile having a chest edge surface, a back edge surface and side surfaces, at least one of the side surfaces being profiled by longitudinal ribs and / or longitudinal grooves, the respective locking cylinder comprising a locking cylinder housing with a cylindrical housing bore and a cylinder core with core axis and rotatably accommodated in the housing bore a key channel that runs essentially parallel to the core axis and is adapted to the key shaft profile,
wherein the lock cylinder housing has in at least one tumbler plane approximately containing the core axis substantially radially to the core axis housing pin bores for receiving radially inwardly spring-loaded housing pins of tumbler pin pairs and the lock cylinder core has core pin bores for receiving core pins, which core pin bores in a basic rotational position of the cylinder core (key insertion position and key removal ) aligned with the housing pin holes,
the key channel and accordingly also the key shaft each have a profile area near the chest with an axially parallel chest plane and a back profile area with an axially parallel back plane,
with notches from the breast edge surface are worked into the profile area near the chest, which cooperate with inner ends of the core pins such that in the basic rotational position they control contact surfaces between the core pins and the housing pins in a cylindrical separating surface between the housing bore and the cylinder core, with the back near the back The central plane in the basic rotational position of the cylinder core includes an acute angle with the tumbler plane, whereby further - again in the basic rotational position - the middle plane near the chest essentially coincides with the tumbler plane and the notches are delimited by notching surfaces, which are preferably essentially orthogonal Standing on the middle plane near the chest, this group of locking cylinders is divided into at least two, preferably three, most preferably four subgroups, with the side faces in a first subgroup having a predetermined basic profile with a predetermined positive angular value that can be varied by cross-sectional variation of the longitudinal ribs and / or longitudinal grooves Define + α of the acute angle between the median plane near the back and the tumbler plane, whereby in a second subgroup the basic profile is unchanged with regard to the longitudinal rib or longitudinal groove design, but the acute angle has the same negative angle value -α in terms of amount, while further in a third Subgroup the basic profile of the first subgroup is mirrored with respect to the tumbler level and wherein in a fourth subgroup the basic profile of the second subgroup is mirrored with respect to the tumbler level. When using locking systems, one of the sub-groups can be used for one locking system. Within the individual locking systems can then be varied in the usual way by modifying the respective basic profile, ie by changing the rib depth and width or the groove height and width in each case in a plane orthogonal to the axis of the locking shaft and / or by different notch arrangement.
An even larger number of closure variations can be obtained by providing an upper group of previously described groups, the individual groups differing from one another in terms of the amount of angle values of the acute angle + α or -α. Applied to locking systems, one can in particular proceed in such a way that, for example, a locking system is assigned a specific sub-group with a specific angle value. If locking systems do not have a large number of individual locking cylinders and associated bowls, you can also set up several locking systems with a subset of a predetermined angular value.

For the groups of an upper group, it should again be the case that the angle difference between groups adjacent in terms of angular value amounts to at least approx. 5 °. If one again assumes that the angular values are to be varied between approximately 5 ^o and approximately 16 ^o , and further assumes that in order to avoid attempting to forcefully insert a specific key into a locking cylinder of an adjacent angular value, the angular distance is not should be smaller than 5 °, you can then provide at least three groups in an upper group.

A major advantage of the lock cylinder design according to the invention can also be achieved by a group of lock cylinders, each with a key, the key shaft of which is designed with a shaft profile having a chest edge surface, a back edge surface and side surfaces, at least one of the side surfaces being profiled by longitudinal ribs and / or longitudinal grooves, the respective lock cylinder comprising a lock cylinder housing with a cylindrical housing bore and a cylinder core with a core axis rotatably accommodated in the housing bore and a key channel which runs essentially parallel to the core axis and is adapted to the shaft profile,
wherein the lock cylinder housing has in at least one tumbler plane approximately containing the core axis substantially radially to the core axis housing pin bores for receiving radially inwardly spring-loaded housing pins of tumbler pin pairs and the lock cylinder core has core pin bores for receiving core pins, which core pin bores in a basic rotational position of the cylinder core (key insertion position and key removal ) aligned with the housing pin holes,
the key channel and, accordingly, the key shaft each have a profile area close to the chest with an axially parallel middle plane near the chest and a profile area near the back with an axially parallel middle plane near the back,
with notches from the breast edge surface are worked into the profile area near the chest, which cooperate with inner ends of the core pins such that in the basic rotational position they control contact surfaces between the core pins and the housing pins in a cylindrical separating surface between the housing bore and the cylinder core, with the back near the back The central plane in the basic rotational position of the cylinder core forms an acute angle with the tumbler plane, whereby - again in the basic rotational position - the middle plane near the chest essentially coincides with the tumbler plane and the notches are delimited by notch surfaces, which are preferably essentially orthogonal to the breast plane near the chest plane , This group of lock cylinders divided into at least two sub-groups, the side surfaces in the sub-groups basically the same, possibly due to cross-sectional variation of the longitudinal ribs and / or Län gsnuten have varied basic profiles and the acute angles between the middle plane close to the back and the tumbler level within the individual subgroups are the same in terms of sign and amount and are also the same in sign from subgroup to different groups, but differ in amount. In this embodiment, the locking cylinders of a locking system can each be assigned to a sub-group, wherein - particularly in the case of a small locking system - several locking systems can also be accommodated within a sub-group. The individualization between individual locking cylinders of a locking system can in turn take place by varying the cross-sectional dimensions of the ribs and grooves forming the basic profile and / or by means of different notches.

According to another aspect, the invention relates to a method for producing locking cylinders, each with a key, the Key shaft is designed with a shaft profile having a chest edge surface, a back edge surface and side surfaces, at least one of the side surfaces being profiled by longitudinal ribs and / or longitudinal grooves, the respective locking cylinder comprising a locking cylinder housing with a cylindrical housing bore and a cylinder core with core axis and rotatably accommodated in the housing bore a key channel running essentially parallel to the core axis and adapted to the shaft profile,
wherein the lock cylinder housing has in at least one tumbler plane approximately containing the core axis substantially radially to the core axis housing pin bores for receiving radially inwardly spring-loaded housing pins of tumbler pin pairs and the lock cylinder core has core pin bores for receiving core pins, which core pin bores in a basic rotational position of the cylinder core (key insertion position and key removal ) aligned with the housing pin holes,
the key channel and accordingly also the key shaft each have a profile area near the chest with an axially parallel chest plane and a back profile area with an axially parallel back plane,
wherein notches are worked into the profile area near the chest, which cooperate with inner ends of the core pins in such a way that, in the basic rotational position, they control contact surfaces between the core pins and the housing pins in a cylindrical separating surface between the housing bore and the cylinder core,
wherein the profile area near the back in the basic rotational position of the cylinder core includes an acute angle with the tumbler plane, whereby further - again in the basic rotational position - the chest plane near the chest essentially coincides with the tumbler plane and the notches are delimited by notch surfaces, which are preferably in the stand essentially orthogonally on the middle plane near the chest, with at least two of four subgroups being produced as part of the overall production of these lock cylinders, the side faces in a first subgroup having a predetermined basic profile with a predetermined positive angular value that may be varied by cross-sectional variation of the longitudinal ribs and / or longitudinal grooves Define + α of the acute angle between the median plane close to the back and the tumbler plane, whereby in a second subgroup the basic profile is unchanged with regard to the longitudinal rib or longitudinal groove design, but the acute angle has a negative angular value -α of the same amount, further in one third subgroup the basic profile of the first subgroup is mirrored with respect to the tumbler level and wherein in a fourth subgroup the basic profile of the second subgroup is mirrored with respect to the tumbler level.

This method can be expanded further in that a plurality of groups are produced within the overall production of these locking cylinders, which differ from one another by different angular values + α or -α.

Furthermore, the invention relates to a method for producing locking cylinders, each with a key, the key shaft of which is designed with a shaft profile having a chest edge surface, a back edge surface and side surfaces, at least one of the side surfaces being profiled by longitudinal ribs and / or longitudinal grooves, the respective locking cylinder comprising Lock cylinder housing with a cylindrical housing bore and a cylinder core rotatably received in the housing bore with a core axis and a substantially parallel to the core axis, key channel adapted to the shaft profile,
wherein the lock cylinder housing has in at least one tumbler plane approximately containing the core axis substantially radially to the core axis housing pin bores for receiving radially inwardly spring-loaded housing pins of tumbler pin pairs and the lock cylinder core has core pin bores for receiving core pins, which core pin bores in a basic rotational position of the cylinder core (key insertion position and key removal ) aligned with the housing pin holes,
wherein the key channel and accordingly also the key shaft each have a profile area near the chest with an axis-parallel, chest-near central plane and a back-near profile area with an axis-parallel center near the back,
wherein notches are worked into the profile area near the chest, which cooperate with inner ends of the core pins in such a way that, in the basic rotational position, they control contact surfaces between the core pins and the housing pins in a cylindrical separating surface between the housing bore and the cylinder core,
the central plane near the back in the basic rotational position of the cylinder core includes an acute angle with the tumbler plane and - again in the basic rotational position - the middle plane near the chest essentially coincides with the tumbler plane and the notches are delimited by notch surfaces, which are preferably essentially orthogonal to the breast near the breast Stand middle level. At least two sub-groups are produced as part of the overall production of these locking cylinders,
where in the subgroups the side surfaces are basically the same, possibly due to cross-sectional variation of the Longitudinal ribs and / or longitudinal grooves have varied basic profiles and the acute angles between the median plane near the back and the tumbler plane are the same in terms of sign and amount in the individual subgroups and are also alike in amount from subgroup to subgroup.

• a) der spitze Winkel wird an einem Vormaterialkörper angebogen und anschließend werden die Rippen und/oder Nuten in den abgewinkelten Vormaterialkörper eingearbeitet;
• b) der spitze Winkel wird an einem Vormaterialkörper angeprägt und anschließend werden die Rippen und/oder Nuten in den abgewinkelten Vormaterialkörper eingearbeitet;
• c) es werden gleichzeitig der spitze Winkel und die Rippen und/oder Nuten an einem Vormaterialkörper angeprägt;
• d) es wird mittels eines Ziehdüsenverfahrens ein Winkelprofilkörper gezogen und anschließend werden die Rippen und/oder Nuten in den gezogenen Winkelprofilkörper eingearbeitet;
• e) es wird ein Winkelprofilkörper gezogen, wobei gleichzeitig in der Ziehdüse die Rippen und/oder Nuten gebildet werden;
• f) es wird ein Winkelprofilkörper extrudiert und es werden anschließend Rippen und/oder Nuten in den extrudierten Winkelprofilkörper eingearbeitet;
• g) es wird ein Winkelprofilkörper extrudiert, wobei gleichzeitig die Rippen und/oder Nuten in der Extruderdüse ausgeformt werden;
• h) durch Befräsen eines Vormaterialkörpers werden gleichzeitig der spitze Winkel und die Rippen und/oder Nuten gebildet;
• i) es werden Rippen und/oder Nuten in einen Vormaterialkörper eingearbeitet und anschließend wird der spitze Winkel an den mit Rippen und/oder Nuten versehenen Vormaterialkörper angebogen.

As part of the various processes for producing the locking cylinder and the associated key, intermediate blanks with the ribs and / or grooves and with the respective acute angle can be produced in order to obtain the keys for the individual subgroups or subgroups and then in these according to the locking secret of the respective locking cylinder incorporate the notches. There are now a whole range of options for producing the respective intermediate blank:

• a) the acute angle is bent on a material body and then the ribs and / or grooves are worked into the angled material body;
• b) the acute angle is embossed on a material body and then the ribs and / or grooves are worked into the angled material body;
• c) the acute angle and the ribs and / or grooves are simultaneously impressed on a material body;
• d) an angular profile body is drawn by means of a drawing nozzle method and the ribs and / or grooves are then worked into the drawn angular profile body;
• e) an angular profile body is drawn, the ribs and / or grooves being formed simultaneously in the drawing nozzle;
• f) an angle profile body is extruded and then ribs and / or grooves are worked into the extruded angle profile body;
• g) an angular profile body is extruded, the ribs and / or grooves being formed in the extruder nozzle at the same time;
• h) the acute angle and the ribs and / or grooves are formed simultaneously by milling a primary material body;
• i) ribs and / or grooves are worked into a raw material body and then the acute angle is bent on the raw material body provided with ribs and / or grooves.

If there has been repeated mention of incorporation in the foregoing, in particular incorporation of grooves and / or ribs by milling operations is envisaged, preferably using a single milling cutter on each side surface of the key shaft, the axis of rotation of which is essentially orthogonal to the longitudinal axis of the key stands.

The key handle part and the key shaft part can each be manufactured and connected to one another, for example by soldering or welding. This method, which appears complex at first glance, has in the case of the invention Design of the key has the advantage that the transition between the angled key shaft and the handle part can be obtained with high accuracy, without having to carry out complicated milling operations and without the need for expensive stamping tools. However, it should also not be excluded that the transition between the key shaft and the key handle part is obtained by stamping or milling. The key handle part is preferably plane-parallel.

Basically, it is possible that the key handle part is made in one piece with the key shaft part. In this case, in addition to making the transition by milling or embossing, you can also remember that the handle part is crossed over the shaft part. In any case, thanks to the transition between the angled shaft part and the grip part, a stop surface can be obtained which, when the key is inserted into the key channel, defines exactly the position in which the notches of the key shaft interact properly with the radially inner ends of the core pins, regardless of whether the notches themselves are provided with sharp transitions at their roots or with continuous transitions.

In order to allow the user of the lock cylinder and the associated key to find the familiar situation when inserting the key into the respective key channel, it is proposed that the key grip part be set with a central part of the grip part essentially parallel to the middle plane close to the chest. Then it is achieved that the key handle part assumes a vertical position with its central plane if - as is usually the case - the tumbler plane and thus the central plane near the chest are aligned vertically.

According to a further aspect, the invention relates to a set of key pre-blanks for locking cylinders of the type explained above which are not yet profiled on the side surfaces. This set comprises a plurality of pre-blank types,
which differ from one another in terms of sign and / or magnitude different angular values of the acute angle between the median plane near the back and the median plane near the chest. Such a set of non-profiled key pre-blanks can be kept available, for example, in the manufacturing company in which both keys and locking cylinders are manufactured. In this way, the storage in the manufacturer's key and lock cylinder is facilitated, especially when the amounts of the angular values are graded in a predetermined manner. This also simplifies production, warehousing and sales for the manufacturer of key blanks, which does not manufacture locking cylinders at the same time.

According to a further aspect, the invention relates to a set of key blank blanks for locking cylinders profiled on the side surfaces of the type explained above. This set comprises a plurality of intermediate blank types, possibly different rib and or groove dimensions, which differ from one another by sign and / or magnitude different angular values of the distinguish acute angle between the median plane near the back and the median plane near the chest. This in turn reduces the manufacturing effort and storage for the manufacturer of locking cylinders and associated keys and also for the manufacturer of intermediate blanks. In addition, the supply and inventory of intermediate blanks is reduced for the locksmith, which can only be achieved by milling notches on the need to be adapted to each individual locking cylinder.

According to a further aspect, the invention relates to a key intended for a lock cylinder, in particular a lock cylinder according to the invention described above, the key shaft of which is designed with a shaft profile having a chest edge surface, a back edge surface and side surfaces, at least one of the side surfaces being provided by longitudinal ribs and / or longitudinal grooves is profiled, the key shaft also having a profile area near the chest with a middle plane near the chest and a profile area near the back with a center plane near the back, with notches being machined further into the profile area near the chest. According to the invention includes at such a key, the breast close to the center plane with the back near the center plane an acute angle which is preferably about 5 to about 16 ^{o o} is. The line of intersection of the middle plane near the chest and the middle plane near the back can be offset, preferably slightly, with respect to the base of the notch of the notch cut deepest in the chest edge surface toward the back edge surface. In particular, the cutting line can lie in the region of the base of a longitudinal groove. It is advantageous if the cutting line lies in a middle height range of the shaft profile, preferably in a region whose border near the back of the back edge surface and the breast near border of the chest edge surface each about 30% of the total height of the shaft profile undamaged by notches. In addition, in the key according to the invention, the notches can preferably be delimited by notch surfaces, which are preferably essentially orthogonal to the middle plane near the chest.

• a) unterschiedliches Vorzeichen des Winkels oder/und
• b) unterschiedlichen Betrag des Winkels oder/und
• c) Profilspiegelung oder/und
• d) unterschiedliche Querschnittsgestaltung der Längsnuten bzw. Längsrippen

voneinander unterscheiden.Several such keys can form a set of keys within which the individual keys are found

• a) different sign of the angle or / and
• b) different amount of the angle or / and
• c) profile mirroring or / and
• d) different cross-sectional design of the longitudinal grooves or longitudinal ribs

differentiate from each other.

The invention further relates to an intermediate blank for a key of the type described, with the respective key profile and handle part which can be derived therefrom, and with a notched chest edge surface. Several such intermediate blanks can form an intermediate blank set for the manufacture of a key set.

According to a further aspect, the invention relates to a pre-blank for the production of an intermediate blank of the type described and a set of pre-blanks for the production of a set of such intermediate blanks, the pre-blanks being designed with the intermediate blank derived therefrom having a corresponding shaft envelope profile and, if desired, also a grip part, the side faces of Longitudinal grooves and longitudinal ribs are free and the chest edge area is free of notches.

Figur 1

einen zur Achse orthogonalen Schnitt durch einen erfindungsgemäßen Schließzylinder;

Figuren 2a-2d

Frontansichten verschiedener Schließzylinder nach der Erfindung und

Figur 3

einen Schlüssel für einen Schließzylinder nach Figur 2d.

The accompanying figures explain the invention using an exemplary embodiment; it represents:

Figure 1

a section orthogonal to the axis through a lock cylinder according to the invention;

Figures 2a-2d

Front views of various lock cylinders according to the invention and

Figure 3

a key for a lock cylinder according to Figure 2d.

In Figure 1 you can see a lock cylinder housing 10 with a cock profile. This lock cylinder housing 10 has a cylindrical housing bore 12, on the inner circumferential surface of which a cylinder core 14 is rotatably mounted. The axis of the cylinder core 14 is designated A, it is also the axis of the housing bore 12. A key channel 16 is incorporated into the cylinder core 14 along the axis A, which receives a key shaft 18s. The key shaft 18s has a back edge surface 18a, a chest edge surface at the level 18b and two side surfaces 18c and 18d. The back edge surface 18a lies against the inner peripheral surface 12a of the housing bore 12. The pectoral surface at level 18b faces a series of tumbler pin pairs,
which are arranged one behind the other in a tumbler plane Z perpendicular to the plane of the drawing. Notches 20 are cut into the breast edge surface 18b in the direction perpendicular to the plane of the drawing, only one of which is shown in FIG. 1. Each notch 20 works with one Tumbler pin pair 22 together, each tumbler pin pair 22 consisting of a core pin 22a and a housing pin 22b. The core pin 22a is received in a core pin bore 24a, while the housing pin 22b is received in a housing pin bore 24b. The housing pin 22b is biased in the direction of the axis A by a helical compression spring 26. The upper end of the core pin 22a engages in the notch 20. If a key 18 adapted to the locking secret of the locking cylinder is inserted, the notch 20 is matched to the tumbler pin pair 22 such that when the upper end of the core pin 22a is immersed in the notch 20, the contact surface 28 between the core pin 22a and the housing pin 22b coincides with the separating surface 12a between the cylinder core 14 and the housing bore 12, ie coincides with the inner circumferential surface 12a of the housing bore 12. This then applies to all notches 20 and associated tumbler pin pairs 22. It is clear that then and only if all contact surfaces 28 with the separating surface 12a coincide, the cylinder core can be rotated. The key 18 can only be inserted and removed when the core pins 22a and the housing pins 22b lie together in the tumbler plane Z, because only when the key is inserted and when the key is removed between successive notches 20 can existing projections slide over the tumbler pin pairs 22 by pressing the tumbler pin pairs 22 downward against the action of the associated spring 26.

In FIG. 1, a key area 18 can be distinguished from a breast area B with a middle plane BM close to the chest and a back area R with a middle plane RM close to the back. The middle plane BM close to the chest and the middle plane RM close to the back form an angle α with one another a, which is denoted by -α in accordance with the usual counting in a Cartesian coordinate system in FIG.

In the left side surface 18c of the key shaft 18s grooves N₁ and N₂ are incorporated, which form ribs between them, while in the right side surface of the key shaft 18s grooves M₁, M₂, M₃ and M₄ are incorporated, which also form ribs between them. It can be seen from Figure 1 that the break point between the two profile parts R and B and thus between the two central planes BM and RM is at the level of the bottom left groove N₂. In general, it can be said that the kink point is in any case above and preferably just above the deepest notch 20 machined into the chest edge surface 18b. In relation to the still notch-free profile of the key shaft 18s, it can be said that the kink K lies in the middle height range of the profile of the key shaft 18s, for example in an area whose back and chest boundaries from the back edge surface 18a and the chest edge surface 18b are each approx. 30 % of the total height of the notched profile of the shaft 18s.

The locking cylinder according to FIG. 2b, designated there in the front view, corresponds to that according to FIG. 1. The key shaft is not shown in FIG. 2b. Accordingly, in FIG. 2b, the ribs intended and adapted to engage in the grooves of the key shaft 18s are designated M₁R-M₄R or N₁R-N₂R.

Let us now compare FIGS. 2b and 2a. It can be seen that the distribution of the ribs M₁R-M₄R and N₁R-N₂R in the two different locking cylinders according to Figures 2b and 2a is identical. The difference between Figures 2b and 2a is that - again under On the basis of the angular count in a Cartesian coordinate system - the angle between the middle plane near the chest BM and the middle plane RM near the back in FIG. 2a is + α. It follows that while maintaining the same side surface profiles defined by the ribs M₁R-M₄R and N₁R-N₂R, two different shaft profiles are available. These shaft profiles can be varied further by varying the width and / or the depth of the ribs M₁R-M₄R and N₁R-N₂R in one or more stages. In this way, a first subgroup of locking cylinders is available according to FIG. 2a, the locking cylinders within this group being able to differ in terms of the width and / or depth of the ribs M₁R-M₄R and N₁R-N₂R. The subgroup according to FIG. 2a can thus be used, for example, to set up a hierarchical locking system. This can be done, for example, in such a way that in a number of subordinate locking cylinders the key channel 16 is completely filled by the shaft part of the respectively associated key, while a superordinate key fitting in all subordinate locking cylinders partially fills the key channels 16 of the subordinate locking cylinders by the grooves M₁-M₄ and N₁-N₂ of the parent key are kept wider and / or deeper than the respectively assigned ribs M₁R-M₄R or N₁R-N₂R of the subordinate locking cylinder. Then the superordinate key can be inserted into all subordinate locking cylinders, while conversely the keys of the subordinate locking cylinders cannot be inserted into a superordinate locking cylinder, the key channel of which is completely filled by the superordinate key, because the grooves of these subordinate keys are less wide and / or less are deep than the grooves of the parent key.

Further profile variations are possible in that, while maintaining the side profiles of the side surfaces of the key shaft 18s and the key channel 16 given by the grooves M₁-M₄ and N₁-N₂ or by the ribs M₁R-M₄R and N₁R-N₂R, the angles + α and - α can be varied in steps in Figures 2a to 2b. For example, the amount of the angle + α or of the angle -α is at least 5 ° and at most 16 °. In between, for example, three gradations are possible for the respective amount of the angular value. The gradations are selected so that it is not possible to insert a key with a predetermined angle value + α or -α into a locking cylinder whose angle value + α or -α corresponds to the next step.

It is fundamentally possible to use only lock cylinders of the type according to FIG. 2a or of the type according to FIG. 2b and to vary only the amount of the respective angle + α or -α and in this way to generate sub-groups of lock cylinders within which again individualizations by different Widths and / or depths of the grooves M₁-M₄ and N₁-N₂ or the ribs M₁R-M₄R and N₁R-N₂R are possible.

In Figure 2c you can see a locking cylinder, which is derived from the locking cylinder according to Figure 2a in that it is mirrored together with the associated ribs with respect to the tumbler plane Z, so that again the negative angle value -α between the central plane RM close to the back and BM near the chest. Also due to the lock cylinder type according to Figure 2c, an expanded sub-group can be formed by varying the width and / or depth of the ribs M₁R-M₄R and N₁R-N₂R or the grooves M₁-M₄ and N₁-N₂. Furthermore, on the basis of the lock cylinder type according to FIG. 2c, by varying the angle value -α gain approximately between -5 ° and -16 ° subgroups within which further individualization is possible by varying the grooves or rib dimensions.

The lock cylinder type according to FIG. 2d is in turn derived from the lock cylinder type according to FIG. 2b by mirroring with respect to the tumbler plane Z. What has been said in relation to FIG. 2c applies to the formation of subgroups and subgroups.

A division can be defined, for example, as follows: Figures 2a-2d each represent the basic profile of a subgroup, with the subgroups being maintained by maintaining the respective angle + α or -α and the respective basic profile by differently dimensioning the ribs in the locking cylinder and the grooves in Key can be expanded. These subgroups together form a group.

Each individual of the lock cylinder types according to FIGS. 2a-2d and the associated key can be subdivided into subgroups which differ from one another only by differences in the amounts of the respective angles. In each of these subgroups, an expansion is again possible by varying the widths and / or depths of the ribs or grooves.

By changing the amounts of the angle values in all subgroups derived from FIGS. 2a-2d, an upper group results.

In FIGS. 2a-2d, the line scale SK further indicates that the depth of the notches (see notch 20 in FIG. 1) is gradual, but if desired also continuous can be varied. The gradual variation of the notch depths is preferred, however, because it reduces the number of tumbler pin pairs that are necessarily to be kept in stock.

The locking cylinders described so far can in principle also be combined with springless additional locking pins, locking pins and blind pins, as are shown and explained in German patent 31 23 511. Reference is made in detail to this patent specification for disclosure. Furthermore, the locking cylinders according to the invention can also be combined with locking levers, as shown and described in detail in European Offenlegungsschrift 0 237 799.

FIG. 3 shows a key which corresponds to the locking cylinder according to FIG. 2d. In FIG. 3 it can be seen that by the inclination of the middle plane BM close to the chest and the middle plane RM close to the back by an angle -α in the back region R, an edge 30 can be formed at the transition between the key shaft 18s and the key handle 18g, for example by embossing the key or by milling the key or by assembling the key from separately manufactured parts 18s and 18g. This edge 30 can be used to stop on the end face ST of the lock cylinder core (see FIG. 2d) and thus to determine the insertion position of the key shaft in the key channel, in which the contact surfaces 28 all coincide with the separating surface 12a.

While only a single contact surface 28 between the core pin 22a and the housing pins 22b is shown in FIG. 1, one can easily imagine that One or more platelets can also be inserted between core pin 22a and housing pin 22b, so that the lock cylinder core 14 can be made ready to rotate with respect to the lock cylinder housing 10 with different depths of the respective notch 20. This can also be used to expand the locking variation, especially in the context of locking systems.

In FIG. 3, notch flanks are schematically indicated by 32 and 34, which are preferably, but not necessarily, perpendicular to the middle plane BM close to the chest.

It is preferable to provide invariant profile areas in the subgroup or subgroup. These invariant profile areas can be formed, for example, by the lowest partial area of the profile area B close to the chest and the uppermost partial area of the profile area R close to the back.

For the manufacturer of the locking cylinder or even the key, there is a significant simplification and therefore cheaper if, based on a basic profile once created, it can not only vary by varying the rib and groove cross sections, but can also use at least some of the possible variations, which are available by changing the acute angle in terms of sign and amount and / or by mirroring.

Claims (36)

Lock cylinder (10) with a key (18), the key shaft (18s) of which is designed with a shaft profile (18s) having a chest edge surface (18b), a back edge surface (18a) and side surfaces (18c, 18d),
wherein at least one of the side surfaces (18c, 18d) is profiled by longitudinal ribs and / or longitudinal grooves (N₁, N₂, M₁-M₄), this lock cylinder (10) comprises a lock cylinder housing with a cylindrical housing bore (12) and one in the housing bore (12 ) rotatably accommodated cylinder core (14) with core axis (A) and a key channel (16) which runs essentially parallel to the core axis (A) and is adapted to the shaft profile, the lock cylinder housing in at least one tumbler plane (Z) approximately containing the core axis (A) in Has housing pin bores (24b) directed radially to the core axis (A) for receiving radially inwardly spring-loaded housing pins (22b) of tumbler pin pairs (22) and the lock cylinder core (14) has core pin bores (24a) for receiving core pins (22a), which core pin bores ( 24a) in a basic rotational position of the cylinder core (14) (key insertion and key removal) lll) with the housing pin bores (24b), the key channel (16) and accordingly also the key shaft (18s) each have a profile area (B) close to the chest with an axis-parallel central plane (BM) and a profile area (R) close to the back with an axis-parallel have central plane (RM) close to the back, with notches (20) being worked into the profile area (B) near the chest from the chest edge surface (18b), which notches cooperate with inner ends of the core pins (22a) in such a way that they are in the basic rotational position Control contact surfaces (28) between the core pins (22a) and the housing pins (22b) in a cylindrical separating surface (12a) between the housing bore (12) and the cylinder core (14), and the central plane (RM) close to the back in the basic rotational position of the cylinder core (14) forms an acute angle with the tumbler plane (Z),
characterized by
that - again viewed in the basic rotational position - the middle plane (BM) close to the chest coincides essentially with the tumbler plane (Z) and that the notches (20) are delimited by notch areas which are preferably essentially orthogonal to the middle plane (BM) near the chest. A group of lock cylinders (10), each with a key (18), the key shaft (18s) of which is designed with a shaft profile having a chest edge surface (18b), a back edge surface (18a) and side surfaces (18c, 18d), at least one of the side surfaces (18c, 18d) is profiled by longitudinal ribs and / or longitudinal grooves (N₁, N₂, M₁-M₄), the respective locking cylinder (10) comprising a locking cylinder housing with a cylindrical housing bore (12) and a cylinder core rotatably accommodated in the housing bore (12) (14) with core axis (A) and a key channel (16) which runs essentially parallel to the core axis (A) and is adapted to the shaft profile, the lock cylinder housing being at least substantially in a radial direction to the core axis (Z) in at least one tumbler plane (Z) containing the core axis (A) ( A) directed housing pin bores (24b) for receiving radially inwardly spring-loaded housing pins (22b) from tumbler pin pair ren (22) and the lock cylinder core (14) has core pin bores (24a) for receiving core pins (22a), which core pin bores (24a) are aligned with the housing pin bores (24b) in a basic rotational position of the cylinder core (14) (key insertion and key removal position), the key channel (16) and accordingly also the key shaft (18s) each have a profile region (B) close to the chest with an axially parallel midplane (BM) and a back profile region (R) with an axially parallel midplane (RM), further from notches (20) are incorporated into the profile area (B) close to the chest in the chest edge surface (18b), which cooperate with inner ends of the core pins (22a) in such a way that in the basic rotational position they contact surfaces (28) between the core pins (22a) and the housing pins ( 22b) into a cylindrical separating surface (12a) between the housing bore (12) and the cylinder core (14) the central plane (RM) close to the back in the basic rotational position of the cylinder core (14) includes an acute angle with the tumbler plane (Z),
wherein - again in the basic rotational position - the middle plane (BM) near the chest essentially coincides with the tumbler plane (Z), the notches (20) being delimited by notch areas which are preferably essentially orthogonal to the middle plane (BM) near the chest , This group of locking cylinders divided into at least two, preferably three, most preferably four subgroups, with the side surfaces (18c, 18d) in a first subgroup being a predetermined one, possibly due to cross-sectional variation of the longitudinal ribs and / or longitudinal grooves (N₁, N₂, M₁-M₄) variable basic profile with a predefined, Define positive angle value + α of the acute angle between the central plane (RM) close to the back and the tumbler plane (Z),
in a second subgroup the basic profile with regard to the longitudinal ribs or longitudinal groove design (N₁, N₂, M₁-M₄) is unchanged, but the acute angle has a negative angle value -α of the same amount,
wherein in a third subgroup the basic profile of the first subgroup is mirrored with respect to the tumbler level (Z)
and wherein in a fourth subgroup the basic profile of the second subgroup is mirrored with respect to the tumbler level (Z). Upper groups of groups of locking cylinders (10) according to claim 2,
where individual groups differ from one another in terms of the amount of the angle values of the acute angle + α or -α. Supergroup according to claim 3
characterized,
that the angular difference between groups neighboring in terms of angular value amounts to at least approximately 5 °. A group of lock cylinders (10), each with a key (18), the key shaft (18s) of which is designed with a shaft profile having a chest edge surface (18b), a back edge surface (18a) and side surfaces (18c, 18d), at least one of the side surfaces (18c, 18d) is profiled by longitudinal ribs and / or longitudinal grooves (N₁, N₂, M₁-M₄), the respective lock cylinder (10) comprising a lock cylinder housing a cylindrical housing bore (12) and a cylinder core (14) rotatably received in the housing bore (12) with a core axis (A) and a key channel (16) which runs essentially parallel to the core axis (A), the locking cylinder housing being in at least a tumbler plane (Z) containing the core axis (A) approximately radially to the core axis (A) and housing pin bores (24b) for receiving radially inwardly spring-loaded housing pins (22b) of tumbler pin pairs (22) and the lock cylinder core (14) has core pin bores (24a ) for receiving core pins (22a), which core pin bores (24a) in a basic rotational position of the cylinder core (14) (key insertion and key removal position) are aligned with the housing pin bores (24b), the key channel (16) and accordingly also the key shaft ( 18s) each have a profile area near the chest (B) with an axis have parallel mid-plane (BM) close to the chest and a profile area (R) near the back with an axially parallel mid-plane (RM) near the back, with notches (20) which are incorporated with the inner ends of the Core pins (22a) cooperate in such a way that in the basic rotational position they contact surfaces (28) between the core pins (22a) and the housing pins (22b) into a cylindrical separating surface (12a) between the housing bore (12) and the cylinder core (14), whereby the central plane (RM) close to the back in the basic rotational position of the cylinder core (14) forms an acute angle with the tumbler plane (Z),
whereby further - again in the basic rotational position - the middle plane near the chest (BM) essentially coincides with the tumbler plane (Z) and the notches (20) are delimited by notch areas, which are preferably essentially orthogonal to the middle plane (BM) near the chest, this group of locking cylinders (10) divided into at least two sub-groups, the sub-groups being the Side surfaces (18c, 18d) have basically the same basic profiles, possibly due to cross-sectional variation of the longitudinal ribs and / or longitudinal grooves (N₁, N₂, M₁-M₄) and the acute angles between the central plane (RM) close to the back and the tumbler plane (Z) within the individual Subgroups are the same in sign and amount and are also the same in sign from subgroup to subgroup, but are different in amount. A group of locking cylinders (10) according to claim 5, characterized in that
that the angular difference between subgroups neighboring in terms of angular value amounts to at least approximately 5 °. Method for producing locking cylinders (10), each with a key (18), the key shaft (18s) of which has a shaft profile which has a chest edge surface (18b), a back edge surface (18a) and side surfaces (18c, 18d), at least one of the Side surfaces (18c, 18d) is profiled by longitudinal ribs and / or longitudinal grooves (N₁, N₂, M₁-M₄), the respective lock cylinder (10) comprising a lock cylinder housing with a cylindrical housing bore (12) and one rotatably received in the housing bore (12) Cylinder core (14) with core axis (A) and a shaft profile that runs essentially parallel to the core axis (A) Adapted key channel (16), the locking cylinder housing in at least one tumbler plane (Z) approximately containing the core axis (A), essentially radially to the core axis (A) and directed to the housing pin bores (24b) for receiving radially inwardly spring-loaded housing pins (22b) of tumbler pin pairs (22 ) and the locking cylinder core (14) has core pin bores (24a) for receiving core pins (22a), which core pin bores (24a) are aligned with the housing pin bores (24b) in a basic rotational position of the cylinder core (14) (key insertion and key removal position), further the key channel (16) and accordingly also the key shaft (18s) each have a profile region (B) close to the chest with an axially parallel midplane (BM) and a back profile region (R) with an axially parallel midplane (RM), further from the chest edge surface (18b) forth in the breast area Profilber Eich (B) notches (20) are incorporated, which cooperate with inner ends of the core pins (22a) such that they contact surfaces (28) between the core pins (22a) and the housing pins (22b) in a cylindrical separating surface (12a) in the basic rotational position Control between the housing bore (12) and the cylinder core (14), the central plane (RM) close to the back in the basic rotational position of the cylinder core (14) including an acute angle with the tumbler plane (Z),
the central plane (BM) close to the breast essentially coincides with the tumbler plane (Z) and the notches (20) are delimited by notch surfaces (32, 34), which are preferably essentially orthogonal to the central plane near the chest ( BM) stand, whereby in Within the overall production of these locking cylinders (10) produces at least two of four sub-groups,
wherein in a first subgroup the side surfaces (18c, 18d) a predetermined, possibly by cross-sectional variation of the longitudinal ribs and / or longitudinal grooves (N₁, N₂, M₁-M₄) variable basic profile with a predetermined positive angle value + α of the acute angle between the median plane near the back (RM) and the guard locking level (Z),
in a second subgroup the basic profile with regard to the longitudinal ribs or longitudinal groove design (N₁, N₂, M₁-M₄) is unchanged, but the acute angle has a negative angle value -α of the same amount,
wherein in a third subgroup the basic profile of the first subgroup is mirrored with respect to the tumbler level (Z)
and wherein in a fourth subgroup the basic profile of the second subgroup is mirrored with respect to the tumbler level (Z). Method according to claim 7,
characterized,
that one produces a plurality of groups within the overall production of these locking cylinders (10), which differ from one another by different angular values + α or -α. Method for producing locking cylinders (10), each with a key (18), the key shaft (18s) of which has a shaft profile which has a chest edge surface (18b), a back edge surface (18a) and side surfaces (18c, 18d), at least one of the Side surfaces (18c, 18d) by longitudinal ribs and / or Longitudinal grooves (N₁, N₂, M₁-M₄) is profiled, the respective lock cylinder (10) comprising a lock cylinder housing with a cylindrical housing bore (12) and one in the housing bore (12) rotatably received cylinder core (14) with a core axis (A) and one key channel (16) running essentially parallel to the core axis (A) and adapted to the shaft profile,
The locking cylinder housing has housing pin bores (24b) for receiving radially inwardly spring-loaded housing pins (22b) of tumbler pin pairs (22) in at least one tumbler plane (Z) approximately radially to the core axis (A), and the locking cylinder core ( 14) has core pin bores (24a) for receiving core pins (22a), which core pin bores (24a) are aligned with the housing pin bores (24b) in a basic rotational position of the cylinder core (14) (key insertion and key removal position), the key channel (16) and Accordingly, the key shaft (18s) each have a profile area (B) close to the chest with an axially parallel middle plane (BM) and a backward profile area (R) with an axially parallel midplane (RM), further from the chest edge surface (18b) in the Chest profile area (B) notches (20) incorporated which cooperate with inner ends of the core pins (22a) in such a way that, in the basic rotational position, they contact surfaces (28) between the core pins (22a) and the housing pins (22b) into a cylindrical separating surface (12a) between the housing bore (12) and the cylinder core (14) control, the central plane (RM) close to the back in the basic rotational position of the cylinder core (14) including an acute angle with the tumbler plane (Z),
the central plane (BM) near the chest essentially coincides with the tumbler plane (Z) and the notches (20) are delimited by notch areas,
which are preferably substantially orthogonal to the middle plane (BM) near the chest, at least two sub-groups being produced as part of the overall production of these locking cylinders (10),
where in the subgroups the side surfaces (18c, 18d) have basically the same basic profiles, possibly varied by cross-sectional variation of the longitudinal ribs and / or longitudinal grooves (N₁, N₂, M₁-M₄) and the acute angles between the center plane (RM) close to the back and the tumbler plane ( Z) the same in terms of sign and amount in the individual subgroups and also the same in sign from subgroup to subgroup, but different in amount. Method according to one of claims 7-9,
characterized,
that to obtain the key (18) for the individual subgroups or subgroups intermediate blanks with the ribs and / or grooves (N₁, N₂, M₁-M₄) are generated with the respective acute angle and in these the notches (20; 32,34) be incorporated. A method according to claim 10,
characterized,
that the respective intermediate blank is produced by bending the acute angle on a raw material body and then incorporating the ribs and / or grooves (N₁, N₂, M₁-M₄) into the angled raw material body. A method according to claim 10,
characterized,
that the respective intermediate blank is produced by impressing the acute angle on a material body and then incorporating the ribs and / or grooves (N₁, N₂, M₁-M₄) in the angled material body. A method according to claim 10,
characterized,
that the respective intermediate blank is produced by simultaneously pressing the acute angle and the ribs and / or grooves (N₁, N₂, M₁-M₄) on a material body. A method according to claim 10,
characterized,
that the respective intermediate blank is produced by pulling an angled material body and then incorporating the ribs and / or grooves (N₁, N₂, M₁-M₄) into the angled material body. A method according to claim 10,
characterized,
that the respective intermediate blank is produced by pulling an angled raw material body with simultaneous formation of the ribs and / or grooves (N₁, N₂, M₁-M₄). A method according to claim 10,
characterized,
that the respective intermediate blank is produced by extruding an angled raw material body and then incorporating the ribs and / or grooves (N₁, N₂, M₁-M₄). A method according to claim 10,
characterized,
that the respective intermediate blank is produced by extruding an angled raw material body with simultaneous formation of the ribs and / or grooves (N₁, N₂, M₁-M₄). A method according to claim 10,
characterized,
that the respective intermediate blank is produced by milling a raw material body while forming the acute angle and the ribs and / or grooves (N₁, N₂, M₁-M₄). A method according to claim 10,
characterized,
that the respective intermediate blank is produced by incorporating the ribs and / or grooves (N₁, N₂, M₁-M₄) in a material body and then bending the acute angle on the profiled material body. Method according to one of claims 10-19,
characterized,
that a key handle part (18g) and a key shaft part (18s) are each manufactured individually and are connected to one another. Method according to one of claims 10, 11, 12, 13, 18, 19,
characterized,
that a key handle part (18g) is made in one piece with a key shaft part (18s). A method according to claim 20 or 21,
characterized,
that the key grip part (18g) is produced with a central part of the grip part essentially parallel to the middle plane (BM) close to the chest. A set of key pre-blanks for locking cylinders (10) according to one of claims 1 - 6, which are not yet profiled on the side surfaces (18c, 18d),
comprising a plurality of pre-blank types, which differ from one another in terms of sign and / or magnitude different angular values (± α) of the acute angle between the central plane (RM) close to the back and the central plane (BM) close to the chest. A set of key intermediate blanks for locking cylinders (10) profiled on the side surfaces (18c, 18d) according to one of Claims 1 - 6,
comprising a plurality of intermediate blank types, which differ from one another in terms of sign and / or magnitude different angular values (± α) of the acute angle between the central plane (RM) close to the back and the central plane (BM) close to the chest. A key (18) for a locking cylinder (10), in particular a locking cylinder according to claim 1, the key shaft (18s) of which has a shaft profile having a chest edge surface (18b), a back edge surface (18a) and side surfaces (18c, 18d), wherein at least one of the side surfaces (18c, 18d) is profiled by longitudinal ribs and / or longitudinal grooves (N₁, N₂, M₁-M₄), the key shaft (18s) also having a near-breast Has profile area (B) with a middle plane (BM) close to the chest and a profile area (R) near the back with a middle plane (RM) near the back, with notches (20) being worked into the profile area (B) near the chest from the chest edge surface (18b),
characterized,
that the middle plane near the chest (BM) includes an acute angle (α) with the middle plane (RM) near the back. Key according to claim 25,
characterized,
that the angle (α) is about 5 ^o to about 16 ^o . Key according to one of claims 25 and 26,
characterized,
that the line of intersection of the middle plane (BM) near the chest and the middle plane (RM) near the back is offset, preferably slightly, with respect to the notch base of the notch (20) cut deepest in the chest edge surface (18b) towards the back edge surface (18a). Key according to claim 27,
characterized,
that the cutting line is in the area of the bottom of a longitudinal groove (N₂). Key according to one of claims 27 and 28,
characterized,
that the cutting line lies in a central height range of the shaft profile (18s), preferably in a range whose border near the back of the back edge surface (18a) and its border near the breast are spaced from the chest edge surface (18b) in each case by approximately 30% of the total height of the shaft profile (18s) undamaged by notches (20). Key according to one of claims 25-29,
characterized,
that a grip part (18g) of the key (18) is substantially parallel to the chest plane (BM) over its entire height. Key according to one of claims 25-30,
characterized,
that the notches (20) are delimited by notch surfaces, which are preferably substantially orthogonal to the middle plane (BM) near the chest. A set of keys according to any one of claims 25-31,
within which the individual keys can be found a) different sign of the angle (α) or / and b) different amount of the angle (α) or / and c) profile mirroring or / and d) different cross-sectional design of the longitudinal grooves (N₁, N₂, M₁-M₄) or longitudinal ribs differentiate from each other. Intermediate blank for a key according to one of claims 25 - 31,
with shaft profile (18s) and grip part (18g) in accordance with the key (18) that can be derived therefrom and with notched chest edge surface (18b). A set of intermediate blanks according to claim 33 for the manufacture of a set of keys according to claim 32. Pre-blank for the production of an intermediate blank according to claim 33,
with shaft cover profile and, if desired, also with handle part (18g) corresponding to the intermediate blank that can be derived therefrom, the side surfaces (18c, 18d) being free from longitudinal ribs and longitudinal grooves (N₁, N₂, M₁-M₄) and the chest edge surface (18b) from notches (20) free is. A set of pre-blanks according to claim 35 for the manufacture of a set of intermediate blanks according to claim 34.

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