EP0927801B1 - Lock cylinder for a security lock - Google Patents

Abstract

The housing (2) projects beyond the core (3) at the front with an extension (11) in which a cover plate (12) is located, having an aperture (14) aligned with the key channel (4). The outer edge (17) of the cover plate is located in a circumferential undercut groove (15) of the housing extension and is rotatable in this along with the cylinder core.

Description

The following invention relates to a lock cylinder for a security lock according to the preamble of claim 1.

In the present application it is assumed that that locking cylinder is the generic term for different special Exemplary embodiments - e.g. Profile cylinder, lever cylinder, Outer cylinder for box locks ... is.

Lock cylinders of this type are generally known, see e.g. Brochure BKS janus or document US-A-1 662487. They have a cylinder housing, in which a cylinder core - after release by the tumbler elements - is rotatable. To align the tumbler elements, in the case of pin tumblers, each made from a core pin and housing pin, there is a security key, which is inserted into the key channel of the cylinder core becomes. The incisions provided in the key align the Tumbler elements so that - provided the key is authorized to access - the cylinder core is free in the cylinder housing can be rotated.

As additional coding you can use the security key Longitudinal grooves are provided with corresponding profile projections of the key channel interact.

The problem with such locking cylinders is the danger an outside attack.

The complex structure of such locking cylinders requires a relatively easy to edit material for those Parts that hold the tumblers, e.g. Brass.

As is known, the cylinder core is one of these Lock cylinder therefore the considerable risk of drilling exposed. There is also the method of core pulling. For this purpose, a high-strength screw screwed in, which is then tightened with a Puller is acted on so that the cylinder housing breaks.

To prevent this, so-called security fittings are with cylinder cover. Such one Security fitting is placed upstream of the locking cylinder. The Security fitting has one immediately in front of the lock cylinder lying cylinder armor in which a rotatably mounted Drill protection disk is located, which is provided with a slot which is in alignment with the key channel can be brought. Prevent the slot dimensions not inserting the key as far as the front End of the key neck on the cylinder core. Still are the slot dimensions so small that the cylinder core significantly is covered. At the same time is the drilling protection disc rotatably mounted in the cylinder cover, so that an attached Twist drill only the slotted drilling protection disc set in rotation. In this way the Lock cylinder protected against drill attacks.

Such a protective fitting is, however, quite complex and requires additional action on his Installation.

It is an object of the invention, the known lock cylinder to develop so that attacks with a compact design selective and successful on the outside of the locking cylinder can be repelled.

The invention solves this problem with the features of Claim 1.

The advantage of the invention is that a drilling protection for the cylinder core of the lock cylinder in that only outer casing protruding a few millimeters above the cylinder core of the locking cylinder integrated unobtrusively on the outside is. The lock cylinder can therefore in without further measures the usual standard length steps.

One aspect of selective defense is the defense against attempted drilling. Defense against these violent attacks on the Lock cylinder is primarily due to the rotatable bearing the cover plate both in the cylinder housing and relatively to the cylinder core. This alone already creates effective protection against drilling into the cylinder core. Since the lock cylinder according to this invention by appropriate Color of the cover plate clearly on the outside can differ from conventional locking cylinders In this way, occasional intruders can be recognized from outside indicated that attempts to break open are considerably more difficult. This promotes the confidence of the security-conscious consumer and may reduce the number unusable made lock cylinder.

The implementation of the invention is simple and inexpensive to do. In principle, it is sufficient in the protruding longitudinal area of the cylinder housing a circumferential To provide an annular groove, which is the rotary bearing of the cover plate serves. The cover plate sits with her Outer edge in the circumferential annular groove of the cylinder housing and is in this ring groove at least after appropriate use of force freely rotatable.

On the other hand, can be between the cylinder core and the Cover plate also provide a connection that is initially torsionally rigid, that only when a certain minimum load is exceeded breaks open, so that the cover plate with their Slot is always in alignment with the key channel while the necessary drilling protection after exceeding the minimum load offers.

The cover plate can therefore also be used as an indicator for a break-in attempt can be used.

For this purpose, it is advisable to directly cover the cover to be placed in front of the cylinder core. The cover plate takes over not only the drilling protection function but also the stop function of the cylinder core for the key neck. Advantageously, there is between the back of the cover plate and the face of the cylinder core flat contact. Furthermore, the cover plate can also be of the rotating Ring groove in the cylinder housing slightly against the end face of the cylinder core to be pressed in this way To ensure positive locking as long as not tried the cover plate is separated from the cylinder core through the use of force to twist.

Further protection against drilling is conveniently obtained in that the cover plate is hardened.

For this one can use quenched and tempered steels.

Another aspect of selective defense against attacks is the danger of core pulling.

So that the hardened for the purpose of effective drilling protection Cover plate also effectively using a core puller prevented, it is also proposed that the slot in the cover plate at least one -be smaller slice thickness (approx. 3 mm) preferably two themselves have opposite nose (s) jumping inwards that protrudes up to about 3 mm into the slot, which is provided in the cover plate.

When screwing in one of the highly tempered screws, like They are used for core pullers and are crushed Nose (s) the threads of the screw so that it is practical no longer finds resistance.

In addition, it can be provided that the cylinder core has a thin sleeve outside the key channel, that stands in the slot of the cover plate and that there is caulked against the wall of the slot. The thin one The web of the protruding sleeve on the one hand holds the cover plate normally always in an aligned position to the Keyway. On the other hand, the thin sleeve shears with the corresponding one The effect of violence stops early, so that Rotate the cover plate as a drilling protection in the cylinder housing.

Nevertheless, the thin sleeve, caulked to the outside, offers a practically funnel-shaped entry into the key channel, making it easy to insert the key becomes.

Further training is particularly advantageous at which closed the cover plate in the manner of a ring is. This acts as a violent destruction of the Cover plate against and also violent bending, the burglar wants to gain access to the back the cylinder disc.

Although the cover disc according to this invention application can be found in all types of locking cylinders, one should special execution are preferred, in which the Key channel consists of two practically circular holes, which are connected by a short web area are. One of the holes is concentric to the axis of rotation of the cylinder core, the other hole cuts the wall of the cylinder core.

Such a locking cylinder offers considerable advantages regarding the number of possible variations, because the Locking elements radial to the first hole in different Rows and angles can be arranged. in addition comes the possibility of varying the key channel corresponding projections in the hole that the Cuts the wall of the cylinder core. Such one Lock cylinder is e.g. known from EP 0 651 117. The entire content of this disclosure also becomes the content of the present application made.

Claims 3 and 4 also show the benefit of a reduction in stocks Profile variants or variants with / without drilling protection. Out the feature of claims 6 and 7 also results in a reduction of the variants to be kept in stock of core pull protection.

The execution of the locking cylinder as a profile double cylinder, where both the inside and the outside are each designed with a cover plate with regard to reduced storage costs special importance to.

In the following, the invention is based on exemplary embodiments explained in more detail.

Fig.1:

ein Ausführungsbeispiel der Erfindung an einem herkömmlichen Schließzylinder, hier in Ausführung als Profilzylinder

Fig.1a:

Detailansicht des eingekreisten Bereichs aus Fig.1

Fig.2:

Querschnitt durch ein weiteres Ausführungsbeispiel der Erfindung

Fig.3:

Frontalaufsicht auf ein Ausführungsbeispiel der Erfindung gemäß Fig.2

Fig.4:

Detaildarstellung einer verstemmten Abdeckscheibe

Fig.5:

Ausführungsbeispiel der Erfindung mit zusätzlichem Kernziehschutz und Profilierungsbeispielen

Show it:

Fig.1:

an embodiment of the invention on a conventional lock cylinder, here in execution as a profile cylinder

1a:

Detailed view of the circled area from Fig. 1

Figure 2:

Cross section through a further embodiment of the invention

Figure 3:

Frontal view of an embodiment of the invention according to Fig.2

Figure 4:

Detail of a caulked cover

Figure 5:

Embodiment of the invention with additional core pulling protection and profiling examples

Unless otherwise stated below, the following description always for all figures.

1 and 2 in particular show a profile cylinder 1 for a security lock. Such profile cylinder 1 has a cylinder housing 2. In the embodiment of the Fig.1 is the cylinder housing 2 in one piece and in the embodiment 2 the cylinder housing is in two parts. It exists from an outer cylinder housing 2.1 and one therein used inner cylinder housing 2.2.

With reference to the present application, however always assumed that the non-moving components of the profile cylinder 1 are counted to the cylinder housing. The has special constructional design according to Figure 2 alone Manufacturing advantages because of such profile cylinders usual tumblers in the inner cylinder housing 2.2 can be accommodated while the outer cylinder housing 2.1 practically the complete wrapping of the whole Inner life of the profile cylinder 1 is used.

In the cylinder housing 2; 2.1, 2.2 is a cylinder core 3 intended. The cylinder core 3 is in the cylinder housing 2 held axially and is in a bore of the cylinder housing 2 rotatable.

At the front, the cylinder core 3 has the entrance of a key channel 4 on. The key channel 4 serves the security key 10 into the profile cylinder. The most Security key 10 provided incisions then act with the tumblers 6 together. The pin tumblers 6 consist of pairs of pins, one of which is a core pin 7 inside the cylinder core and a housing pin 8 to be arranged within the cylinder housing so that under the influence of the compression spring 9, the common contact zone between the core piece 7 and the housing pin 8 in the parting line 5 aligned between the cylinder core 3 and the cylinder housing 2 becomes.

If this is the case for all pin tumblers shown is, the cylinder core 3 can be inside the cylinder housing Turn 2 and operate the lock.

das Zylindergehäuse 2; 2.1,2.2 überragt den Zylinderkern 3 nach außen hin, d.h. in Richtung zum Eingang des Schlüsselkanals 4 um wenige Millimeter. Dabei steht das Zylindergehäuse 2 mit einem Längsbereich 11 über die vordere Fläche des Zylinderkerns 3 hervor, welche praktisch von dem vorspringenden Längsbereich 11 des Zylindergehäuses 2 überragt wird.

Although pin tumblers 6 are always assumed in the present exemplary embodiments, it should be expressly pointed out that this should not be a limitation of the invention to profile cylinders with pin tumblers. Rather, the following is essential for the invention:

the cylinder housing 2; 2.1.2.2 projects beyond the cylinder core 3 towards the outside, ie towards the entrance of the key channel 4 by a few millimeters. The cylinder housing 2 protrudes with a longitudinal region 11 above the front surface of the cylinder core 3, which is practically overhanged by the projecting longitudinal region 11 of the cylinder housing 2.

In this projecting longitudinal region 11 there is a Axis of rotation 24 of the cylinder core 3 practically coaxial Cover plate 12 is provided. The cover plate 12 has one Recess 14, which is aligned with the key channel 4. Consequently the cover plate 12 becomes the front end of the cylinder core 3 upstream. The cover plate 12 covers the one End face of the cylinder core 3, which violent Attacks are preferred. Because violent attacks in particular from the front end in the profile cylinder 1 take place, the cover plate 12 therefore protects the drilling-sensitive outer surface of the cylinder core 3.

At the same time, the cover plate 12 is undercut circumferential groove 15 of the projecting longitudinal region 11 of the cylinder housing 2 rotatable. The cover plate 12 can thus on the one hand the rotary movement of the cylinder core 3 if the profile cylinder 1 is actuated correctly, follow along. On the other hand, the cover plate 12 is also relative rotatable to the cylinder core 3.

If a drilling attack is therefore carried out on the cylinder core 3 will, the cover plate 12 will be relative to the cylinder core 3 turn and in this way the rotary movement of the attacking drill. The cover plate 12 therefore offers the function of a drilling protection plate, the is installed directly on the profile cylinder 1 itself and thus becomes part of the profile cylinder. The pivot bearing of the Cover plate 12 lies behind the overlapping end face 13 of the cylinder housing 2, so that the cover plate 12 also not with little effort from their intended position can be levered out.

For this purpose, the cylinder housing 2; 2.1 one in Direction to the axis of rotation 24 inwardly jumping collar 16 on, behind which the cover plate 12 with its outer edge 17 lies. A removal of the cover plate 12 could therefore possibly by attacking the collar 16, however, this is due to the slight overhang of the outer End face of the cover plate 12 over the front surface of the Cylinder housing 2.1 considerably more difficult. In both cases there is an immediate attack on the ring collar 16 prevented because this is not possible with conventional tools is accessible.

In addition, the cover plate 12 has an outside lying diameter step 18, this leads to a considerable Material accumulation, which increases the stability of the cover plate 12 is significantly increased. This eliminates the danger the separation of the cover plate 12 is reduced

Since you keep the length of the profile cylinder 1 short wants, it is recommended that the cover 12 immediately the to front front face of the cylinder core 3. In in both embodiments, the cover plate 12 is located directly at the common contact surface 19, the between the cylinder core 3 and the rear of the cover plate 12 consists.

In addition, Figures 1 and 2 show that the Cylinder core 3 has a thin sleeve 20 which is in the recess 14 of the cover plate 12 protrudes. The outer circumference of the thin sleeve 20 is on the inner contour of the recess 14 customized. The thickness of the sleeve 20 is such that the thin sleeve 20 with a short protruding longitudinal area opposite the Cover plate 12 bent outwards i.e. be caulked can.

The caulked sleeve end 21 therefore holds the cover plate 12 in close contact with the front end of the cylinder core 3 and normally also prevents that the relative rotational position between the cover plate 12th and cylinder core 3 changed. In case of violent Drilling attack on the profile cylinder 1, however, shears the thin Sleeve 20 over its load-bearing cross section and enables so the relative rotation of the cover plate 12 to the cylinder core Third

In both embodiments it is realized that the outer edge 17 of the cover plate 12 from the circumferential groove 15 of the cylinder housing 2 is tightly embraced. The cover plate 12 therefore sits practically free of play in the radial direction the undercut circumferential groove 15. In this way Prevents the cover plate 12 from cracking open necessary space is created. Therefore, the narrow enclosure serves the cover plate 12 through the cylinder housing 2 also the additional stabilization of the profile cylinder 1.

The following description is primarily intended show that the invention on profile cylinders different Types can be used.

While in Fig.1 a profile cylinder of conventional design is shown, in which the pin tumblers in the vertical Bridge part of the profile cylinder are housed, shows additionally 2 shows a design in which the pin tumblers in the circular cylindrical upper part of the profile cylinder sit. Such a profile cylinder is e.g. Subject of EP 0 651 117, for the features not expressly mentioned here reference should be made to this document. Essential with this design is that the pin tumblers in different Radial planes with respect to the axis of rotation 24 and exclusively housed in the inner cylinder housing 2.2 are. For this purpose, the cylinder housing 2.2 is held by holding pins 23 held against the rest of the cylinder housing.

As can be seen in particular in FIGS. 3 and 5, there is the key channel from a first bore 25 and a second hole 26. Both holes are vertical one above the other and are interconnected by a short web area 27 connected.

The upper bore 25 is concentric with the axis of rotation 24 of the cylinder core 3. The lower bore 26 intersects the wall of the cylinder core 3 so that the wall at this point is broken.

While the upper bore 25 is practically unprofiled, a profile 29 can be provided for the lower bore 26 his. The profile consists of across the hole protruding projections according to a special feature of the invention not on the wall of the key channel 3, but on the cover plate 12 sit. In this way, namely Path to key channel 4 blocked for all those Security key, which none at the relevant point have corresponding longitudinal groove.

By locally different arrangement of the projections there is a large variation (= reference number 30) in the channel profiling, which are indicated by way of Fig.5 is.

In addition, Figs. 3 and 4 show how the cylinder core 3 with a thin sleeve 20 in the recess of Cover plate 12 protrudes and this in terms of Extends the diameter so far that the thin sleeve 20 caulked against the wall / front surface of the cover plate 12 can be.

From Figure 3 it can also be seen that the average the first hole by the sleeve thickness smaller and the Slightly average of the second hole in the key channel 4 larger than the assigned diameter of the cover plate 12 is. Thus, the cover plate 12 at least covers partially free access to key channel 4 and also protects it against external attacks.

3 shows that the outer diameter 36 of the Cover plate larger than the outer diameter 37 of the cylinder core is. The cover plate is therefore both behind inside and outside via the assigned dimensions of the cylinder core 3.

It is also additionally realized that the cover plate 12 also where the wall of the cylinder core 3 from the key channel 4 is broken, closed via a ring bridge is. The cover plate therefore realizes the principle of one crack-proof closed ring especially where the Wall of the cylinder core 3 is broken.

Relate to the recess 14 of the cover plate therefore continuous above and below the key channel 4 Cross connections that lead to a self-contained Lead ring.

Although the lower ring web 33 is relatively narrow, it is guaranteed he the required stability of the cover plate 12, because this on its outer circumference directly from the cylinder housing 2 is included. It is also recommended to use the cover plate from a tempered steel or from a case hardening steel manufacture.

The resultant with this key channel arrangement large width of the upper ring web 34 contributes to the corresponding Material selection and corresponding thickness for the cover plate 12 also contribute significantly to stability.

The outer edge 17 of the cover plate is also in essentially circular, so that the cover plate 12 in full Includes circumference of the collar 16 of the cylinder housing 2 becomes. A violent removal of the cover plate requires hence the destruction of the entire ring collar 16.

5 shows that the recess 14 in the cover plate 12 has at least one nose 31, which can be up to about 3 mm protrudes into the recess. Fig. 5 also shows the axisymmetric arrangement of two lugs 31 and 32.

These noses are particularly important. For violent There are so-called overcoming such profile cylinders Core extraction devices.

Anchoring is done with the help of highly tempered screws created in the lock cylinder. At this anchoring a puller. The projecting lugs according to FIG. 5 provide in conjunction with the features of claims 4 to 6 therefor, that the highly tempered screws have only a slight hold at the cover plate. The puller is thus the withdrawn necessary resistance.

The symmetrical arrangement of two lugs ensures that with thin cover plates for an effective Squeezing the threads.

Since the cover plate 12 immediately and flush sits in front of the head of the cylinder core 3 - by the caulked Sleeve end 21 it is held axially in this position -, can be due to a slight projection 38 of the outer end face 39 of the cover plate 12 over the front face 13 of the cylinder housing 2 also the depth stop for the inserted safety key 10 through the cover plate 12 can be realized. With that comes the cover plate 12 with practically unchanged total length of the cylinder housing 12 In addition to the safety function, the function of a depth stop. Nevertheless, the cover plate 12 only slight possibilities of attack for intrusion tools.

LIST OF REFERENCE NUMBERS

1

profile cylinder

2

cylinder housing

2.1

outer cylinder housing

2.2

inner cylinder housing

3

cylinder core

4

keyway

5

parting line

6

pin tumblers

7

core pin

8th

housing pin

9

compression spring

10

security key

11

projecting longitudinal area of the cylinder housing

12

cover plate

13

End face of the cylinder housing

14

Recess of the cover plate

15

undercut circumferential groove

16

collar

17

Outer edge of the cover plate

18

Diameter step of the cover plate

19

contact area

20

thin sleeve

21

caulked sleeve end

23

Retaining pins for the inner cylinder housing

24

Axis of rotation of the cylinder core

25

first hole

26

second hole

27

short dock area

28

trimmed area

29

channel profiling

30

Variation of channel profiling

31

first nose

32

second nose

33

lower ring bridge

34

upper ring bridge

36

Outside diameter of the cover plate

37

Outside diameter of the cylinder core

38

Got over

39

outer face

Claims (14)

1. Locking cylinder (1) for a security lock having a cylinder housing (2; 2.1, 2.2) and a cylinder core (3) axially held and rotatable therein, which core comprises in the front the entrance of a key channel (4) for a security key (10) for the purpose of aligning pin tumblers (6), which release the cylinder core (3) in terms of a rotating movement when the correct key (10) is inserted, wherein the cylinder housing (2) rises at the front above the cylinder core (3) with a longitudinal portion (11), and wherein
   in this longitudinal portion a cover element is provided which lies practically coaxially to the cylinder core (3) and which comprises a cut-out (14) which is aligned with the key channel (4) and wherein
   the cover element is mutually rotatable with, and relative to, the cylinder core (3), characterised in that
   the cover element is formed as a covering disc (12) which sits having its outer edge (17) in an undercut circumferential groove (15) which
   is provided in that longitudinal portion (11) of the cylinder housing (2) which rises at the front above the cylinder core (3) and that
   the covering disc (12) is rotatable in this circumferential groove (15).
2. Locking cylinder as claimed in Claim 1, characterised in that the covering disc (12) is disposed directly in front of the end surface of the cylinder core (3).
3. Locking cylinder as claimed in Claim 1 or 2, characterised in that the cut-out (14) in the covering disc (12) has the profile of the security key (10) which belongs to the locking cylinder (1), whereas the key channel (4) is not profiled.
4. Locking cylinder as claimed in any one of Claims 1 to 3, characterised in that the covering disc (12) is produced from a tempering steel or from a case hardened steel.
5. Locking cylinder as claimed in Claim 4, characterised in that the covering disc (12) is hardened.
6. Locking cylinder as claimed in Claim 5, characterised in that the cut-out (14) in the covering disc (12) comprises at least one projection (31) which extends into the cut-out (14) to a length of about 3mm.
7. Locking cylinder as claimed in Claim 6, characterised in that in each case two projections lie opposite each other, preferably symmetrically with respect to the axis of rotation (24) of the cylinder core (3).
8. Locking cylinder as claimed in any one of Claims 1 to 7, characterised in that the cylinder core (3) protrudes into the cut-out (14) of the covering disc (12) by means of a thin sleeve (20) and that the thin sleeve (20) is crimped against the wall of the cut-out (14).
9. Locking cylinder as claimed in any one of Claims 1 to 8, characterised in that the outer diameter (36) of the covering disc (12) is larger than the outer diameter (37) of the cylinder core (3), and that the covering disc (12) is enclosed outside of the cut-out (14) by means of ring lands (33, 34).
10. Locking cylinder as claimed in any one of Claims 1 to 9, characterised in that the key channel (4) consists of two practically circular bores (25, 26) which are connected to each other by means of a short bridge region, of which one bore (25) lies concentric to the axis of rotation (24) of the cylinder core (3) and of which the other bore (26) cuts into the wall of the cylinder core (3), wherein preferably only the latter bore is allocated the necessary profile (30) for the variation of the correct security key (10).
11. Locking cylinder as claimed in any one of Claims 1 to 10, characterised in that the outer edge (35) of the covering disc (12) is encompassed in a close-fitting manner by the circumferential groove (15) of the cylinder housing, preferably with an annular gap of less than 1mm.
12. Locking cylinder as claimed in any one of Claims 1 to 12 [sic], characterised in that the circumferential groove (15) is formed from a collar (16) of the cylinder housing (2; 2.1), which collar sits on the front end of the protruding longitudinal portion (11) of the cylinder housing (2).
13. Locking cylinder as claimed in any one of Claims 1 to 12, characterised in that it is formed as a profiled double cylinder and that a covering disc (12) is provided on both the inner side as well as the outer side.
14. Locking cylinder as claimed in any one of Claims 1 to 13, characterised in that the covering disc (12) is the depth stop for the inserted security key.

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