EP2505748B1 - Locking cylinder - Google Patents

Description

The present invention relates to a lock cylinder according to the preamble of claim 1.

Such a lock cylinder, which is also referred to as a disk cylinder is, for example, in EP 0 712 979 B1 disclosed.

According to Fig. 1 and 2 has a generic disc cylinder or lock cylinder 10, a cylinder housing 12 and a cylinder housing 12 rotatably mounted about a cylinder axis cylinder core 14. The rotational movement of the cylinder core 14 can be transmitted via a coupled with the cylinder core 14 coupling portion 30 to a locking mechanism of a lock, not shown.

In the cylinder core 14, a plurality of rotatable tumbler discs 16 are added in succession along the cylinder axis. The tumbler discs 16 have respective central receiving openings 18 which together form a keyway 28 for insertion of a key 24 and which in the embodiment shown have a rectangular cross-section. The tumbler discs 16 also have respective circumferential recesses 20 for receiving a common locking pin 22 which is aligned parallel to the cylinder axis.

The locking pin 22 is received radially movable in a slot 32 provided in the wall of the cylinder core 14. When the lock cylinder 10 is in its closed position and thus the tumbler discs 16 are rotated into their locking position, the locking pin takes a radially outer blocking position. In this blocking position engages a portion of the locking pin 22 in a provided on the inner wall of the cylinder housing 12 locking pin receptacle 34, so that the cylinder core 14 is blocked against rotation relative to the cylinder housing 12.

By means of the key 24, the tumbler discs 16 can be transferred from their locking position into an unlocked position. When all the tumbler discs 16 are in their unlocked position, i. when the circumferential recesses 20 of all tumbler discs 16 are aligned with each other and radially to the locking pin 22, the locking pin 22 can be displaced radially inwardly into its release position in which it is located outside the locking pin receptacle 34. As a result, the cylinder core 14 is released for rotational movement relative to the cylinder housing 12.

The lock cylinder 10 associated key 24 has a plurality of different angled incisions 26, the different angular positions of the circumferential recesses 20 of the tumbler discs 22 correspond. After insertion into the keyway 28, the key 24 is rotated starting from a zero position in which the central receiving openings 18 are aligned with each other in the opening direction.

The tumblers 16 have relative to the respectively associated cut 26 of the key 24 a certain backlash whose dimension depends on the angular extent of the respective incision 26, ie in response to the angular extent of the incisions 26 reach control sections of the respective cuts 26 and corresponding control sections the central receiving openings 18 of the associated respective tumbler discs 16 at different times or in different angular positions with each other.

For example, starting from the zero position of the tumbler discs 16, the entire rotational path of the key until reaching the unlocking position of all tumbler discs 16 is about 110 °, i. After a rotation of the key 24 by about 110 ° all tumbler discs 16 are sorted and aligned in radial alignment with the locking pin 22. Typically, for the possible angular positions of the circumferential recesses 20, a grid of six different angular positions is provided in a uniform pitch, wherein the angular distance between two adjacent circumferential recesses 20 is approximately 18 °. Accordingly, there are six possible codings for each tumbler 16, wherein for setting one of these codes the tumbler 16 are rotated by a certain angle from its zero position. In the exemplary lock cylinder 10, a coding "1" is achieved after a rotation of the key 24 by about 20 °, an adjacent coding "2" after a rotation of about 38 °, etc., and finally a coding "6" after a Rotation of approx. 110 °, measured from zero position. The circumferential recesses 20 are accordingly arranged in an angular distance corresponding to the respective coding from the zero position.

In the coding "6", a positive coupling between the corresponding tumbler 16 and the associated portion of the key 24 may be provided, ie there is no incision or a cut with the angle 0 °, so that no backlash between the key 24 and the Tumbler 16 is.

In coding "1", however, there is the greatest possible backlash between key 24 and tumbler 16, i. on the key 24, a recess 26 is provided with an angular extent of about 90 °. A tumbler 16 of the code "1" is thus basically only at the end of the rotary operation of the key 24, i. after a rotation of about 90 °, taken and brought by a turn of the key by another approx. 20 ° in its unlocked position.

Typically, a generic lock cylinder also has one or more so-called lift discs, which are typically tumbler discs having the code "6" and provided in a predetermined axial position, e.g. with regard to the key insertion direction at the very front, at the very back or in the middle of the lock cylinder 10. The tumbler disc acting as lifting disc is positively coupled with the key. Based on the release position of the locking pin 22, the lifting disc ensures a key operation in the closing direction that the locking pin 22 is properly raised from the peripheral recesses 20 of the tumbler 16 and not tilted about.

Furthermore, it is customary to arrange intermediate disks 36 between the tumbler disks 16, which are rotationally fixedly coupled to the cylinder core 14. The intermediate disks 36 decouple adjacent tumbler disks 16 from one another so that the rotational movement of a respective tumbler disk 16 does not cause co-rotation of the tumbler disk 16 adjacent thereto for reasons of friction. In fact, such a take-away could lead to a tumbler disk 16 possibly being rotated beyond its unlocking position, so that the lock cylinder 10 can no longer be opened.

The rotationally fixed coupling of the intermediate disks 36 with the cylinder core can be effected by stop sections 40 of the intermediate disks 36 extending at least partially in the radial direction ( Fig. 2 ), which rest against corresponding, formed on the inner wall of the cylinder core 14 projections 42 without play.

Each washer 36 has a peripheral cutout 38 which is radially aligned with the locking pin 22. The dimensions of the peripheral cutout 38 are adapted to the diameter of the locking pin 22, so that the intermediate discs 36 do not hinder displacement of the locking pin 22 in its release position.

Lock cylinder of the type described above have proven to be advantageous tamper resistant. Nevertheless, an unauthorized person, with the aid of a suitable so-called picking tool, can try to scan the individual tumbler discs one after the other and thereby sort them one after the other, i. to bring in the respective unlocked position.

From the document JP 2003 253929 A a lock cylinder with the features of the preamble of claim 1 is known. The document US 4,317,347 A. shows a similar lock cylinder. The document US Pat. No. 4,062,211 shows a similar lock cylinder and a key with the features of claim 6.

It is the object of the invention to provide a lock cylinder of the type mentioned, which has an improved security against manipulation.

The object is achieved in each case by a lock cylinder having the features of claim 1 or claim 3.

As a result, therefore, no complete decoupling of adjacent tumbler discs is effected in a manner relative to one another. Instead, the rotation of a tumbler, for example by means of a picking tool, to the fact that even a tumbler adjacent thereto, which may have been brought by means of the picking tool already in its unlocked position is again rotated by frictional engagement and thus under certain circumstances again from their Unlocked position is offset.

It is understood that the intermediate plates according to the invention can be arranged not only between two mutually adjacent tumbler discs, but also at the very beginning or at the very end of the stack formed from the tumblers and washers, ie adjacent to an end face of the cylinder core.

According to a first aspect of the invention, it is provided that a predetermined number of possible different codes are provided for the tumbler discs, wherein each of the codings is defined by a certain angular position of the circumferential recess of the tumbler with respect to the central receiving opening and the different codings are preferably provided with a uniform angular pitch and wherein the rotational play of the washers corresponds to the minimum angular distance between the locking position (ie the illustrated zero position) and the unlocking position of the tumbler discs for the different possible codes. Such a limited backlash effectively prevents scanning of the lock by means of a picking tool, without causing the risk that with proper operation of the lock cylinder by means of the associated key due to frictional individual tumblers are taken over their unlocking addition. In order to achieve the most effective coupling between two adjacent tumblers by frictional engagement with regard to the picking security, the torsional backlash is as large as possible and corresponds thus at least the said minimum angular distance between the locking position and the unlocking position of the tumbler discs. However, in order not to unintentionally move the tumbler disks beyond their unlocking position, the backlash is preferably not greater than the said minimum angular distance.

Preferably, each washer on its circumference on two stop portions, which cooperate to limit the torsional backlash of the washer with two corresponding stop portions on the inner circumference of the cylinder core. Compared to the above-described conventional intermediate disc whose stop sections ensure a rotationally fixed bearing in the cylinder core, in this case the distance of the stopper portions is increased from each other, so that in a modification of a conventional lock cylinder according to the invention a costly change to the cylinder core, in particular a displacement provided on the inner wall of the cylinder core Projections, not required. This makes it possible to retrofit a conventional lock cylinder with rotatable intermediate washers in a simple manner with the inventive, drehspielbehafteten washers.

According to a second aspect of the invention, each washer has a peripheral cutout, which forms a receptacle for the locking pin in its release position, regardless of the angular position of the washer. This is particularly useful when the diameter of the intermediate discs is substantially equal to the diameter of the tumbler discs to nevertheless ensure displacement of the locking pin in its release position regardless of the angular position of the intermediate discs.

In this case, the angular dimension of the peripheral cutout of the respective intermediate disks corresponds at least to the sum of the angular dimension of the peripheral recesses of the tumbler disks and the backlash of the respective intermediate disk.

According to a further preferred embodiment it is provided that the key has a plurality of differently angled, a respective tumbler associated incisions, wherein the degree of bending of a respective incision of the coding of the associated tumbler corresponds to, and wherein upon rotation of the key in an open position each incision such cooperates with a corresponding control portion of the central receiving opening of the associated tumbler that each tumbler is rotated in its unlocked position.

Preferably, each washer is coupled by frictional engagement with the adjacent tumbler discs. This can be achieved in that the tumbler discs and the intermediate discs are biased in the axial direction to each other, for example by means of a spring.

According to a further preferred embodiment, it is provided that at least one tumbler disc designed as a lifting disc has a substantially backlash-free positive coupling of the control section with the corresponding recess of the key, and that the circumferential recess of the lifting disc has at least one run-on slope, which cooperates with the locking pin that at a rotation of the lifting disc is offset from its unlocking position into the locking position of the locking pin from its release position to its blocking position. The lift disc may be in any position relative to the cylinder axis.

Further advantageous embodiments of the invention are specified in the subclaims, the description and the drawings.

Fig. 1

einen Längsschnitt durch einen Schließzylinder;

Fig. 2

eine Explosionsdarstellung des Schließzylinders von Fig. 1; und

Fig. 3

eine perspektivische Ansicht eines Stapels von Zuhaltungsscheiben und Zwischenscheiben für einen erfindungsgemäßen Schließzylinder.

The invention will be explained below with reference to an embodiment with reference to the drawings. Show it:

Fig. 1

a longitudinal section through a lock cylinder;

Fig. 2

an exploded view of the lock cylinder of Fig. 1 ; and

Fig. 3

a perspective view of a stack of tumblers and washers for a lock cylinder according to the invention.

An inventive lock cylinder largely corresponds to the lock cylinder 10 according to Fig. 1 and 2 , which was already explained in detail at the beginning.

The main difference between a conventional lock cylinder, like him Fig. 1 and 2 show, and the lock cylinder according to the invention is in the embodiment of the intermediate discs.

While according to Fig. 2 in a conventional washer 36, the distance of the stopper portions 40 is selected so that both stop portions 40 simultaneously abut the projections 42 of the cylinder core 14 and thus a rotationally fixed coupling of the intermediate discs 36 is ensured with the cylinder core 14, is in accordance with an intermediate disc 136 according to the invention Fig. 3 the mutual distance of the stopper sections 140 increased by a certain angle. For comparison, in Fig. 3 the corresponding stop portion 40 of a conventional intermediate discs shown in phantom. Said angle dimension defines a torsional backlash S of the respective intermediate disc 136.

This torsional backlash S is preferably chosen so that upon rotation of a tumbler 16 in the direction of its unlocking due to frictional engagement on the associated washer 136 adjacent tumbler 16 is taken only as far as there is a rotation of the tumbler 16 from its zero position to an angular position corresponds to the coding "1". For use with the lock cylinder 10 described above, the backlash S of the washers 136 should therefore be about 20 °, corresponding to the angular distance between the zero position and the angular position of the coding "1". It is understood that this specific angle for the backlash S refers to the lock cylinder 10 described above with the associated angular dimensions. For other angular dimensions and coding grid, the intermediate discs 136 may of course also have a different value of the torsional backlash S.

Due to the limited rotatable intermediate discs 136, a coupling between adjacent tumbler discs 16 is made, which substantially complicates manipulation of the lock cylinder 10 by scanning, but still effectively prevents rotation of individual tumblers 16 beyond their respective unlocking addition.

In order to ensure that the locking pin 22 can be displaced unhindered into its release position despite the backlash S of the intermediate discs 136, the angular dimension of the respective peripheral cutouts 138 the intermediate discs 136 as compared to the angular extent of the peripheral cutouts 38 of the conventional intermediate discs 36 according to Fig. 2 also enlarged. For comparison, in Fig. 3 the peripheral section 38 of a conventional intermediate disks shown in dashed lines. Said angular extent of the peripheral cutouts 138 preferably corresponds to the sum of the angular dimension T of the peripheral recesses 20 of the tumbler discs 16 and the backlash S of the intermediate discs 136.

LIST OF REFERENCE NUMBERS

10

lock cylinder

12

cylinder housing

14

cylinder core

16

tumbler

18

central receiving opening

20

circumferential

22

locking pin

24

key

26

incision

28

keyway

30

coupling portion

32

slot

34

Lock pin receiving

36, 136

washer

38, 138

extensive cutout

40, 140

stop section

S

backlash

T

Angular dimension of the circumferential recesses 20

Claims (6)

1. A lock cylinder comprising
   a cylinder housing (12);
   a cylinder core (14) rotatably supported about a cylinder axis in the cylinder housing (12);
   at least one locking pin (22) which is provided at the outer periphery of the cylinder core (14), which is aligned parallel to the cylinder axis, which can be displaced radially to the cylinder axis, which blocks the cylinder core (14) against a rotational movement in a radially outer blocking position and which releases the cylinder core (14) for a rotational movement in a radially inner release position; a plurality of tumbler disks (16) arranged along the cylinder axis in the cylinder core (14) and rotatably supported between a latch position and an unlatch position, wherein each tumbler disk (16) has a central reception opening (18) for receiving a key (24) and at least one peripheral cut-out (20) for receiving the locking pin (22) in the release position, wherein the locking pin (22) can only be displaced into the release position when all the tumbler disks (16) are in their unlatch position in which the peripheral cut-out (20) of the respective tumbler disk (16) is aligned radially to the locking pin (22); and
   a plurality of intermediate disks (136) arranged along the cylinder axis in the cylinder core, wherein a respective intermediate disk (136) is arranged between two mutually adjacent tumbler disks (16), and wherein the intermediate disks (136) have a predefined rotational clearance (S) relative to the cylinder core (14),
   characterized in that
   a predefined number of possible different codings is provided for the tumbler disks (16), with each of the codings being defined by a specific angular position of the peripheral cut-out (20) of the tumbler disk (16) with respect to the central reception opening (18), with the rotational clearance (S) of the intermediate disks (136) corresponding to the smallest angular spacing between the latch position and the unlatch position of the tumbler disks (16) with respect to the different possible codings.
2. A lock cylinder in accordance with claim 1,
   characterized in that
   each intermediate disk (136) has two abutment sections (140) along its periphery which cooperate with two corresponding abutment sections (42) at the inner periphery of the cylinder core (14) for limiting the rotational clearance (S) of the intermediate disk.
3. A lock cylinder comprising
   a cylinder housing (12);
   a cylinder core (14) rotatably supported about a cylinder axis in the cylinder housing (12);
   at least one locking pin (22) which is provided at the outer periphery of the cylinder core (14), which is aligned parallel to the cylinder axis, which can be displaced radially to the cylinder axis, which blocks the cylinder core (14) against a rotational movement in a radially outer blocking position and which releases the cylinder core (14) for a rotational movement in a radially inner release position; a plurality of tumbler disks (16) arranged along the cylinder axis in the cylinder core (14) and rotatably supported between a latch position and an unlatch position, wherein each tumbler disk (16) has a central reception opening (18) for receiving a key (24) and at least one peripheral cut-out (20) for receiving the locking pin (22) in the release position, wherein the locking pin (22) can only be displaced into the release position when all the tumbler disks (16) are in their unlatch position in which the peripheral cut-out (20) of the respective tumbler disk (16) is aligned radially to the locking pin (22); and
   a plurality of intermediate disks (136) arranged along the cylinder axis in the cylinder core, wherein a respective intermediate disk (136) is arranged between two mutually adjacent tumbler disks (16), and wherein the intermediate disks (136) have a predefined rotational clearance (S) relative to the cylinder core (14),
   characterized in that
   each intermediate disk (136) has a peripheral cutaway (138) which forms a receiver for the locking pin (22) in its release position independently of the angular position of the intermediate disk (136), with the angular dimension of the peripheral cutaway (138) of the respective intermediate disks (136) corresponding to at least the sum of the angular dimension (T) of the peripheral cut-outs (20) of the tumbler disks (16) and the rotational clearance (S) of the respective intermediate disk (136).
4. A lock cylinder in accordance with any one of the preceding claims,
   characterized in that
   each intermediate disk (136) is coupled with the adjacent tumbler disks (16) by friction locking.
5. A lock cylinder in accordance with any one of the preceding claims,
   characterized in that
   the tumbler disks (16) and the intermediate disks (136) are pretensioned toward one another in an axial direction.
6. A lock cylinder and key combination comprising a lock cylinder (10) in accordance with any one of the preceding claims and a key (24),
   characterized in that
   the key (24) has a plurality of differently angled notches (26) associated with a respective tumbler disk (16), with the dimension of the angling of a respective notch (26) corresponding to the coding of the associated tumbler disk (16), and with each notch (26), on a rotation of the key (24) into an open position, cooperating with a corresponding control section of the central reception opening (18) of the associated tumbler disk (16) such that each tumbler disk (16) is rotated into its unlatch position.

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