EP0992642A1 - Securitykey - Google Patents

Abstract

A security lock and key has the key shaped with two rounded profiles linked by a central section. Shaped recesses (3) are spaced along the sides of the key, with the shape and depth corresponding to the size and position of the tumbler rods (9) which slide in and out of the recesses as the key is inserted into lock. The bottom of each rod has a chamfered edge which slides along the flat bottom of each recess and rises out of the recess via tangential slopes at each side.

Description

The invention relates to a security key Preamble of claim 1.

Such a security key is known from US Pat. No. 3,568,481 known. The locking recesses run across the Key chest and serve to align cylindrical core pins. When inserting or removing the security key the core pins run with their rotating Pointed edges on the sloping flanks of the recesses on. This singular contact zone favors in particular for new pairings from security key and Lock cylinder considerable initial wear. The Locking recesses jump behind the outer contour surface of the Back of the key.

Each of the recesses has a central one Rest area. This locking surface is used for height adjustment of the core pin. The locking areas form depth coding in cooperation with core pin and housing pin, so that in the release position when core pin and body pin have fallen into the recess, the gap between Core pin and housing pin exactly in the parting line between The core and housing of the locking cylinder is located and therefore the Rotation of the core in the housing releases.

The tumblers are on the outside of the housing pin spring-loaded to the positive scanning of the locking recesses to ensure. When inserting the security key drive the recesses on the core pins over, with the core pins above all upstream Drive away inclined flanks and recesses until the safety key has reached its end position. You can also drive through several recesses under the core pins, if namely the locking recesses in the direction of insertion seen lying in a row. When pulling out of the key must first be the static friction of the core pin be overcome in the recess. Then drive the recesses under the core pins and shape this one corresponding to the geometry of the inclined flanks Inclined upward movement.

When inserting and removing the security key the core pin in its radial guide hole one by the order of the passing recesses predetermined sequence of radial motions, and that against the spring force of the tumblers at Get out of a recess and in the direction of the spring force when immersed in a recess.

Another security key is known from EP 0 651 117 known for locking cylinder, the key back of two parallel circular cylinders is formed. The recesses are frustoconical depressions in a cylinder surface, the cone axis of the locking recesses perpendicular to the cylinder axis. The recesses can with this security key essentially over the whole The scope of the security key must be distributed. Here the conical lateral surfaces form the inclined flanks in the longitudinal direction for the core pin that comes with the key as it passes over these inclined flanks in and out of the recess the recess can slide out again.

Due to the oblique or truncated cone Training of the recesses must be in the known security keys the base of the core pin, which is usually chamfered is the transition from the locking surface to the sloping flank comprehend. When sliding out of a recess there occurs a quasi singular strain. While the sliding movement over the locking surface, the one in the sliding direction has a larger width than the base of the core pin, only finds a movement of the key relative to the Core pin in the key longitudinal direction instead. In the run-up point the core pin becomes virtually seamless on the sloping flank forced into a radial movement by the inclined flank. The The geometry of the transition therefore requires very tight tolerances the edge curvatures of the base of the core pin and the edge of the recesses to prevent wear through the use of the Avoid security key. If this aspect is neglected, which is sometimes the case with duplicate keys copied by third parties occurs, these inadmissible copies often tend after some time to "hook" in the lock cylinder, if one or more core pins on a sloping flank hit and need to be raised. The operation is thereby over time more difficult and also less secure; because both the core pins of the locking cylinder and the Oblique edges of the security key are caused by the trend loaded for inhibition in the axial direction.

This checkmark only appears and leads after some time to the fact that the locking cylinder is often discredited, although the badly copied duplicate key is the cause.

The object of the invention is therefore a security key of the type mentioned in such a way that also a copied security key when inserting and removing slides practically uninhibited and that the wear of the security key and the core pins of the Lock cylinder remains so low that the lock cylinder cannot be discredited by copied duplicate keys.

The object is achieved by the features of the main claim.

The invention has the advantage that the core pins continuous and therefore uninhibited according to the geometry immerse the recesses in and out of them rising up. The invention is based on the finding that in the conventional geometry of the recesses a certain Inhibition of the core pin when it is chamfered Lateral surface takes place on the inclined flank. This Inhibition points are eliminated by the invention.

The inhibition points - the transitions between the rest area and their sloping flanks - are rounded out as concave Sliding surfaces formed. Due to the concave fillet Singularities - such as Corners or edges - on the glide line the transition excluded.

In addition, the sliding surfaces nestle in the longitudinal direction of the key both on the sloping flanks as well tangentially to the locking surface. This ensures that the geared implementation of the pure longitudinal movement the key for the purely radial movement of the core pin takes place continuously and steadily without peak loads occur though key chest and core pin principally form a link gear, in which two link blocks on perpendicular longitudinal paths are guided and the movement of a backdrop stone (= Key chest) with as little friction as possible and with continuous Transition to the other person's vertical movement Setting stone (= core pin) to be implemented.

The immersion of the core pins in and the ascent due to the special geometry of the recess, the Sliding surface in interaction with the friction properties the sliding pairing facilitated. The force in the longitudinal direction of the Key with which the security key is inserted and is pulled out, is always outside the friction cone, especially in the area of the sloping flanks. Through this The self-locking of the key is excluded. The demand is supported by the proposed rounding and the tangential fit also for the sliding surfaces automatically fulfilled. The angular distance of the force in the longitudinal direction The friction cone is a measure of what is expected Wear. This is always larger in the area of the sliding surfaces or equal to the angular distance in the area of the inclined flanks and approaches the value in the area of the sloping flanks.

The base of the core pin is in the process of being inserted or pulling out always in a continuous Sliding friction condition. The usual breakaway torque at the point of impact on the sloping flank, due to the singular Transition is avoided in the invention.

The core pins and thus the tumblers are practical exposed to only slight axial forces. So you can do not tilt and are only slightly loaded in the axial direction. This will reduce the stress on the foot of the core pin and thus the wear there is minimal. Also the Resting recesses are due to the proposed design less stressed in the above sense.

The key slides with reduced sliding resistance into and out of the locking cylinder, which means easier operation and increased operating safety surrender. The impression is also perfect for the user sliding function of the lock pairs without any hook of the key. The invention thus offers maximum ease of use with reliable and low-wear interaction of security key and lock cylinder.

The exact, geometric positions of the rest areas of the security key are due to the fillets of the Blurred transitions from the resting surface into the sliding flank. They can therefore only be measured imprecisely by scanning. Around To copy quasi curved recesses is to exact scanning of the trajectory an increased scanning accuracy and possibly an additional degree of freedom of the copying machine required.

The sliding surfaces can be designed inconspicuously. Then they are hardly for an uninformed specialist noticeable, so that this the security key in the Usually copied without the corresponding sliding surfaces. One without the trajectory of the recesses of copied keys is comparatively easy to identify as a plagiarism, since it differs from the original on closer optical examination with the trajectory. It also runs in such plagiarism is not so easy from the very first moment Core pins away like the original or an acceptable copy according to the present invention.

Preferred embodiments of the invention are in the subclaims described.

If all along a longitudinal line of the back of the key spaced-apart locking recesses each at each of the transitions from the rest area to one of the Sloping flanks each have a concave rounded sliding surface has, each rest area goes over a key tip side and a key flank side sloping flank into the respective sliding surface. Every recess is there always from sloping flanks and within the sloping flanks lying rest area. In the described configuration runs through a core pin until it reaches it End position of several recesses. Their inhibitions become eliminated by the described configuration.

In addition to this, it is proposed that the transitions between the inclined flanks and the outer contour surface of the The back of the key is designed as a convexly rounded sliding surface are in the longitudinal direction of the key back both on the sloping flanks and on the outer contour surface of the back of the key nestle tangentially. The Transitions are concave on the locking surfaces and on the back of the key convex. All transitions are done with little Sliding resistance sampled because they are designed without singularities are. The above, for example conical locking recess radially outer transitions do not generally inhibit the key to lead; but they are operating the key noticeable and thus also affect the movement of the Closing pairing. The proposed design creates hence a smooth security key that is reliable and practically even the impression of a mechanical actuation of the tumblers reduced to prevented.

It is also proposed that adjacent locking recesses overlap with their sloping flanks and that the transitions between the overlapping sloping flanks designed as convexly rounded sliding surfaces are in the longitudinal direction of the key back to the nestle the respective sloping flanks tangentially. Here The invention offers the advantage that it is also closely spaced Locking recesses - like this for locking cylinders occur with a high degree of security - in the enjoyment of the invention come.

The transitions mentioned are convex fillets. At the manufacturing has the advantage that each recess milled practically throughout in the form of a curve can be. All transitions are in the form of fillets, so that synergy effects play a role in manufacturing. The transitions (two or four different types) only have to programmed once, for example in a CNC machine and can then be used for every recess become. For this purpose it is provided that the locking recesses with the exception of the locking surfaces than in the longitudinal direction of the The back of the key is formed with rounded curves are. Only the discharge zone on the key spider side extremely recessed recess can be of this be exempted. The key spider side facing away Sloping flank of this recess is namely in normal Never apply a core pin to use.

The position of the locking surfaces and the spacing of the locking recesses from each other in the longitudinal direction of the key back are blurred if there are two opposite each other Sliding surfaces of a recess with different Radii of curvature are curved. Then the center of the rest area not exactly the center of the recess, because the Sliding surfaces of a recess have different radii of curvature and, as a rule, also different longitudinal extensions exhibit. When trying to copy is then due to asymmetrical design of the locking recess the locking surface or the position of the corresponding tumbler pins more by determining the center of the recess. The spacing of the recesses is then also can no longer be determined by their edge distances.

The proposed design offers the advantage that sliding essentially equidistant on one Longitudinal recesses not for all corresponding Core pins are made synchronously. The multiplication of the mechanical forces when the core pin slants abut the Sloping edges of the locking recesses of a conventional one Key is replaced by the addition of smaller, mechanical ones Powers. The security key is softer overall.

To ensure that the core pins are on their entire Glide freely when moving the key, it is proposed that the width of the sliding surface in the key direction is larger than the width of the contact zone of the Base of a core pin with the sliding surface in the overrun position of the core pin on the sliding surface. The sliding surface should be the specified width over its entire length seen not fall below. It is particularly important that the width of the sliding surface in the key cross direction on Transition from the locking surface to the sliding surface of the same size or is greater than the width of the contact area of the foot of one Core pin. The specified widths are those in the transverse direction of the key back projected transverse dimensions. The design described above ensures unrestrained Sliding the core pin on the sliding surface. For this it is sufficient, just the width of the contact zone - as indicated - The core pin with the width of the sliding surface accordingly to interpret. This width of the contact zone can vary from the width of the base of a core pin. This is for example, the case when the recess in the has a substantially frustoconical shape. With cylindrical Core pin can be the curvature of the root circle of the core pin smaller than the curvature of the outer circle of the truncated cone be at the level of the rest area. Then the contact zone - with a smaller root circle of the core pin - smaller than that Total width of the core pin. Nevertheless, the contact zone a flat extension.

The unrestricted emergence is then always automatic realized when the width of the sliding surface in the key cross direction greater than or equal to the width of the base of the core pin is. Then the contact zone of the base of the core pin lies with the sliding surface in the run-up position of the core pin always within the width of the sliding surface in the key direction. This means that gliding is uninhibited given. The width of the sliding surface is preferred larger over the entire longitudinal extent of the sliding surface or equal to the width of the base of a core pin. Then too mechanical inhibition points within the sliding surface excluded.

It is envisaged that the locking recess is a frustoconical Sloping flank with a to the longitudinal direction of the Key cone measured cone angle β and that with respect the longitudinal section of the tangent angle to the concave Area measured in relation to the longitudinal direction of the back of the key, is always smaller than the cone angle β. When milling the recesses for example with an end mill Cone angle β is the chamfer angle of the end mill head. The recess is then technically easy to mill that the milling head when immersed in the material the key back and when emerging from the milled Resting recess along a cam track with component in Longitudinal direction is performed continuously. There is an additional one Degree of freedom of the milling machine required.

The mechanical inhibition when the surfaces slide off Locking recess and core pin is further reduced, that the smallest radius of curvature of the sliding surface is larger or equal to the assigned radius of curvature of the core pin its point in contact with the sliding surface is.

Fig.1a

einen Längsschnitt durch eine Rastvertiefung im Schlüsselrücken,

Fig.1b

den Flankenwinkelverlauf des schlüsselkopfseitigen Endes der Rastvertiefung der Fig.1a,

Fig.2a

einen Längsschnitt durch einen Schlüsselrücken mit mehreren Rastvertiefungen und durch Zylinderkern und Gehäuse mit mehreren Zuhaltungen,

Fig.2b

einen Detailausschnitt der Fig.2a,

Fig.3

eine Draufsicht auf eine Rastvertiefung,

Fig.4a

einen erfindungsgemäßen Sicherheitsschlüssel in Seitenansicht,

Fig.4b

einen Schnitt durch den Sicherheitsschlüssel der Fig.4a in Richtung der Pfeile IVb gesehen.

The invention is explained in more detail with reference to exemplary embodiments shown in the drawings. Show it:

Fig.1a

a longitudinal section through a recess in the back of the key,

Fig.1b

the flank angle curve of the key head end of the locking recess of Fig.1a,

Fig.2a

a longitudinal section through a key back with several locking recesses and through the cylinder core and housing with several tumblers,

Fig.2b

a detailed section of Fig.2a,

Fig. 3

a plan view of a recess,

Fig.4a

a security key according to the invention in side view,

Fig.4b

seen a section through the security key of Figure 4a in the direction of arrows IVb.

Unless otherwise stated below, refer all reference numbers always refer to all figures.

1a shows a locking recess 3 in section in the longitudinal direction of the key 6. This recess 3 is in a security key 1 introduced for lock cylinder 2. The Locking recess 3 jumps behind the outer contour surface 4 of the Key back 5 back. The outer contour surface is 4 the shape of the corresponding to the profile of the locking core Key.

The locking recess 3 has 6 in the longitudinal direction of the key back 5 oblique flanks 7. These oblique flanks 7 slide when inserting or removing the security key 1 from the lock cylinder 2 under one Core pin 9 away. The sloping flanks 7 serve to guide of the core pin 9 between a locking surface 11 and the To ensure outer contour surface 4. Each of the recesses 3 has such a locking surface 11. The locking surface 11 serves to align the core pin 9 and housing pin 10 Tumblers 8. The foot sits on the locking surface 11 12 of an associated core pin 9. If the security key 1 is fully inserted, the foot 12 of an associated seat Core pin 9 on its locking surface 11, so that the locking cylinder assumes its release position.

The transition areas between the locking surface 11 and their Sloping flanks 7 are concavely rounded sliding surfaces 13 trained. These sliding surfaces 13 extend in Longitudinal direction 6 of the key back 5 and both nestle to the inclined flanks 7 and to the locking surface 11 in each case tangential. This is the mechanical inhibition diminishes, such as this with a seamless Sloping flank 33 - as shown in dashed lines in Fig.1a is - occurs more. The sloping edge 7 goes smoothly and steadily into the locking surface 11.

This condition applies in principle to every longitudinal section of the key.

The base points of the inclined flanks 7 describe the arise in each longitudinal section, one from the locking surface seen from the outside curved curve, so that all on one side of the latching surfaces practical sloping flanks form an outward curved slope, the lower, the Snap surface 11 facing area of a sliding surface arise lets to which the associated core pin with a partial circumference of the head edge can get hooked.

This creates a contact zone between the Embankment facing partial circumference of the core pin and the concave trained area of the embankment, which in principle a surface contact between the core pin and the lower one Allow end of embankment. Here is the area contact over the entire longitudinal and transverse extension of the Core pin arched outward sliding surface ensured.

By transferring the force from the spring preload, which acts on the core pin, arise over the sliding surface low surface-specific pressures between the sloping flanks the recesses and the corresponding head areas the core pins. This will, among other things the wear in the contact zones is considerably reduced.

In addition, in the embodiment shown also the transitions between the inclined flanks 7 and the outer contour surface 4 of the key back 5 as a convex rounded Sliding surfaces 13 formed, which are also in Longitudinal direction 6 of the key back 5 both on the inclined flanks 7 as well as on the outer contour surface 4 of the key back 5 nestle tangentially. This is a total the locking recess 3 without mechanical inhibition points and uniformly nestled on the locking or outer contours. At the transition from the concave rounded Sliding surface 13 into the convexly rounded sliding surface 13 there may be a turning point, provided that the concave and touch the convex sliding surface together.

To this effect when driving a rest recess 3 under a core pin 9 has to ensure completely the locking recess 3 each have a sliding surface 13 on their key tip end 26 as well as at their key spider end 27. This is especially in view essential to the fact that several core pins 9 can be arranged on the same longitudinal line 42 so that the corresponding locking recess under several core pins 9 and at least under one core pin 9 with all of it Longitudinal slides away. With the sliding surfaces 13 are preferred transitions from the locking surface 11 to the inclined flank 7 meant. These are for mechanically uninhibited gliding crucial. The transitions from the oblique flank 7 to the outer contour surface 4 or to another locking surface 11 (see below) are then preferably also as sliding surfaces 13 in Trained sense of the invention.

It is preferred here that each of the locking recesses 3 has at least two sliding surfaces 13. Again, this applies for the transitions between the locking surface 11 and the inclined flank 7. In the other case, each of the locking recesses 3 has at least four sliding surfaces 13 - as shown - on.

1b shows the course of the flank angle with dashed lines α a seamless sloping edge 33 and pulled through Course of the tangent angle α 'of the embodiment of the 1a depending on the distance L in the longitudinal direction 6 the back of the key. The seamless bevel 33 has a practically rectangular course of the flank angle α on. The flank angle α takes here in the flank area 34 jumps to a constant value and goes back to practical Zero back when leaving edge region 34.

In contrast, the tangent angle α 'increases in the transition area 35 steadily and slowly at first. Then the Incline greater until it again in the flank area 34 Approaching zero. Here also has the sliding surface according to the invention 7 a substantially constant slope, so that from a flank region 34 can be assumed. Right side of the flank area 34 takes the tangent angle α 'in the transition area 35 again until the angle reaches zero the locking surface 11 is assumed.

The invention is characterized by the solid course α ' of the tangent angle. Every course of Sloping flanks 7 of a recess 3, which is rounded so softly is included in the invention. This applies if the fillet and thus the curvilinear course of the tangent angle α 'not only due to manufacturing tolerance is.

Overall, the locking recess 3 has a frustoconical shape Cross-section. The inclined flanks 7 are in relation to the Longitudinal line 42 at the cone angle β. Regarding the longitudinal section is the tangent angle α 'to the sliding surface 13, measured to the longitudinal direction 6 of the key back 5, smaller than the cone angle β. This is done with cam track milling an end mill with a milling head chamfered at an angle β reached when the milling head in the area of the inclined flanks 7 during its longitudinal movement of a continuous Transverse movement is subjected.

2a shows a longitudinal section through the key back 5. Included in the longitudinal section are core 28 and Housing 29 of a lock cylinder 2 with corresponding tumblers 8. There are latching depressions spaced apart from one another 3 available. At the same time there are recesses 3 provided, which overlap with their inclined flanks 7. In Fig.2a these are the two right-hand locking recesses 3. All locking recesses 3 have the invention Sliding surfaces 13. Go to the two right recesses 3 into each other. The transition between the locking surface 11 the left-hand locking recess 3 and the inclined flank 7 of the right-hand locking recess 3 is a convex sliding surface 13 trained in the sense of the invention.

The key back 5 closes in the key direction 16 the core 28. It has 38 in the core holes Seated core pins 9. The core pins 9 sit with their feet 12 on the associated locking surfaces 11 (see also Fig.1). The parting line 30 between core 28 and housing 29 is exactly between the core pins 9 and the housing pins 10 arranged so that the rotation of the core 28 is made possible. The security lock is thus shown in the release position.

Fig. 2a shows a detailed view of Fig. 2a enlarged shown. Here a bevel 31 of the Foot 12 of the core pin 9 visible. The chamfer angle is 32 here larger than the flank angle α shown, so the core pin 9 always with its underside on the sliding surface 13 and the sloping flank 7 slides along. Included in the invention are also pairs of locking cylinders and security keys, where the bevel angle 32 with the flank angle α matches.

The curvature of the sliding surface 13 can be local Describe radii of curvature 21. A radius of curvature is an example 21 of the sliding surface 13 together with a dashed line Circle of curvature shown. The radius 21 of this Circle of curvature is larger than that in the contact point associated radius of curvature 22 of the outer foot edge 23 of the Core pin 9. core pin-sliding surface pairings, so dimensioned are always sliding freely on each other. The radius of curvature 21 is preferably at least twice this large as the radius of curvature 22 in order to exclude an inhibition.

3 shows a plan view of the locking recess 3. The locking recess 3 is elongated in the longitudinal direction 6 of the key to oval shaped. The ends of the recess 3 are rounded and go into the inclined flanks 7. The recess 3 is here of a self-contained, rotating Embankment includes. The slope faces two to each other parallel side flanks 14, the ends of which by 180 ° extending inclined flanks 7 are each connected. At the transition 40 of the inclined flanks 7 into the locking surface 11 "Light edges" shown. These transitions 40 correspond to the Sliding surfaces 13 in plan view. In the embodiment shown the locking surface 11 is elongated and oval. The resting area 11 can also spiral or partially spiral around the Key back 5 wind around and thus with both component in the longitudinal direction 6 and in the transverse direction 16 of the key back 5 run. With correspondingly narrow keys the side flanks 14 are also not formed. Nevertheless, such keys are intended to be included in the invention as long as there are embankments in the sense of the inventions.

Lying on the locking surface 11 is the floor plan of the Foot 12 of the core pin 9 shown, just on the sliding surface 13 of the inclined flank 7. The foot 12 of the core pin 9 has a smaller width 20 than the width 15 of the Sliding surface 13. This is equal to the width of the locking surface 11 so that the foot 12 does not touch any of the side flanks 14. The Floor plan of the foot 12 of the cylindrical core pin 9 is circular. The radius of this circle is less than that Radius of curvature of an imaginary "light edge" between the sliding surface 13 and locking surface 11. This makes the width 17 of Contact zone 18 of the foot 12 of the core pin 9 with the sliding surface 13 in the guide position 19 of the core pin 9 on the Sliding surface 13 smaller than the width of the foot 12 of the core pin 9. The width 15 of the sliding surface 13 in the key direction 16 is larger than the width 17 of said contact zone 18. This ensures that the Guaranteed sliding surface on the core pin 9.

The requirement that the Width 15 of the sliding surface 13 in the key transverse direction 16 greater than or equal to the width 20 of the base 12 of the core pin 9 is.

4a shows a security key 1 in an overall view. The security key 1 has recesses 3. As described above, these are partly curved educated. They are in the outer contour surface 4 of the key back 5 introduced. They are all between Key tip 24 and key head 25. Each locking recess 3 thus has a key tip end 26 and one End on the keyside side. On the shown longitudinal line 42 are several locking depressions 3. The longitudinal distance 43 of the Locking recesses 3 from each other is by the center distance given the respective recesses 3. This longitudinal distance 43 can also be different from the distance of the corresponding Core pins 9, since one of the locking recesses 3 with the Locking surface 11 is elongated. The position of the Core pins 9 is therefore only with precise knowledge the relative position of the recesses 3 not to be determined.

Fig.4b shows the section of Fig.4a, there with IVb is indicated. The cut runs through a recess 3. The key back 5 consists of two parallel Solid cylinders 36, which are connected by means of connecting web 37 are. The locking recesses 3 are on each of the two solid cylinders 36 radially to the respective cylinder axis 41 or introduced secantial to this. You can also choose whole or partially run on the connecting web 37.

This means that the entire scope of the key spine 5 available for the arrangement of the recesses 3. For As a rule, a large number of recesses are provided to increase security 3 provided and thus also as many core pins 9. But this also means an increased number of Transitions and inhibitions. With such a security key 1 brings the reduction in inhibition among the numerous Inhibition points also correspondingly great improvement in Sliding and reducing wear.

The locking recesses 3 can practically cover the entire The circumference of the solid cylinder 36 can be arranged distributed. It there is therefore a very large surface area for attaching the Locking recesses 3 available. Since the recesses 3 with rounded sliding surfaces 13 and with a curved track Course can be formed, their space requirement is opposite conventional recesses 3 increased. Despite the elevated Space requirements can be large surface of such security key 1 many Locking recesses 3 may be provided according to this invention.

Reference symbol list:

1

Security key

2nd

Locking cylinder

3rd

Rest recess

4th

Outer contour surface

5

Key back

6

Longitudinal direction

7

Sloping flank

8th

Tumbler

9

Core pin

10th

Housing pin

11

Rest area

12th

Foot of the core pin

13

Sliding surface

14

Side flank

15

Width of the sliding surface

16

Key cross direction

17th

Width of the contact zone

18th

Touch zone

19th

Guiding position of the core pin

20th

Width of the base of the core pin

21

smallest radius of curvature of the sliding surface

22

Radius of curvature of the outer edge of the foot of the core pin

23

Outer foot edge of the core pin

24th

Key tip

25th

Key head

26

key-tip end of the recess

27

end of the locking recess on the key head side

28

core

29

casing

30th

Parting line

31

chamfer

32

Bevel angle

33

seamless sliding flank

34

Flank area

35

Transition area

36

Solid cylinder

37

Connecting bridge

38

Core drilling

39

Housing bore

40

crossing

41

Cylinder axis

42

Longitudinal line

43

Longitudinal distance of the recesses

α

Flank angle

α '

Tangent angle

β

Cone angle

L

Longitudinal route

Claims (8)

Security key (1) for locking cylinder (2), wherein the security key (1) has locking recesses (3) which spring back behind the outer contour surface (4) of the key back (5) and inclined flanks (7) running in the longitudinal direction (6) of the key back (5) ) and each of the locking recesses (3) for aligning their tumbler consisting of core pin (9) and housing pin (10) each has a locking surface (11) on which the foot (12) of the associated core pin (9) is seated , characterized in that the inclined flanks, seen from the latching surfaces (11), form curved outward slopes and that transitions between the latching area (11) and their slopes with respect to the outer contour surface (4) are rounded off as concave and as regards the core pins as arcuate sliding surfaces (13) which are curved away from the associated core pin and which extend in the longitudinal direction (6) of the back of the key (5) fit both tangentially to the inclined flanks (7) and to the locking surface (11). Security key according to Claim 1, characterized in that of all the locking recesses (3) which are spaced apart from one another along a longitudinal line of the key spine, each at each of the transitions from the locking surface (11) to one of the inclined flanks (7) has a concavely rounded and arcuate shape from the respectively associated one Has core pin curved away sliding surface (13). Security key according to Claim 1 or 2, characterized in that the transitions between the inclined flanks (7) and the outer contour surface (4) of the key back (5) are designed as convexly rounded sliding surfaces (13) which extend in the longitudinal direction (6) of the key back ( 5) fit tangentially to both the inclined flanks (7) and the outer contour surface (4) of the key back (5). Security key according to claim 2 or 3, characterized in that adjacent locking recesses (3) overlap with their oblique flanks (7) and that the transitions between the respective overlapping oblique flanks (7) are designed as convexly rounded sliding surfaces (13) which are in Fit the longitudinal direction (6) of the back of the key (5) tangentially to the inclined flanks (7) involved. Security key according to one of claims 1 to 4, characterized in that two opposing sliding surfaces (13) of a locking recess (3) are each curved with different radii of curvature. Security key according to one of claims 1 to 5, characterized in that the locking recesses (3), with the exception of the locking surfaces (11), are designed as curved paths which are rounded continuously in the longitudinal direction (6) of the key back (5). Security key according to one of claims 1 to 6, characterized in that the latching recess (3) has a truncated cone-shaped oblique edge (7) with a cone angle (β) measured in relation to the longitudinal direction (6) of the key back (5) and that all tangent angles ( α ') on the concave sliding surface (13), measured in relation to the longitudinal direction (6) of the key back (5), are smaller than the cone angle (β). Security key according to one of Claims 1 to 7, characterized in that the smallest radius of curvature (21) of the sliding surface (13) is greater than or equal to the assigned radius of curvature (22) of the core pin (9) at its point in contact with the sliding surface (13) is.

Images