TWI865633B - Lock cylinder - Google Patents

Abstract

The present invention relates to a lock cylinder comprising a cylinder housing and a cylinder core that is rotatably supported in the cylinder housing about a cylinder axis and that is secured by means of a circlip against an axial movement relative to the cylinder housing, wherein the cylinder core has a keyway for the introduction of an associated key, wherein the cylinder core can be rotated between a locked position and an open position by means of the introduced key, and wherein the lock cylinder has a plurality of tumblers that can be actuated by means of the associated key. In the lock cylinder in accordance with the invention, provision is made that the circlip together with the cylinder housing forms a rotary abutment for limiting an angle of rotation of the cylinder core to a predetermined rotary angle range.

Description

Lock cylinder

The invention relates to a lock barrel, which comprises a lock barrel shell and a lock barrel core, the lock barrel core is rotatably supported in the lock barrel shell about the lock barrel axis and is fixed by a spring-shaped stop ring to prevent axial movement relative to the lock barrel shell, wherein the lock barrel core has a key slot for introducing an associated key, wherein the lock barrel core can be rotated between a locked position and an unlocked position by the introduced key, and wherein the lock barrel has a plurality of bullet bolts, which can be actuated by associated keys.

Such lock cylinders are generally known and are used in locks of many different designs, for example in door locks, hanging locks or two-wheeler locks, to name just a few applications. There are different designs, such as profile lock cylinder, round lock cylinder, oval lock cylinder, half-round lock cylinder, double lock cylinder or knob lock cylinder.

Depending on the type of lock, the locked position of the lock cylinder can also be designated as the zero position, while the open position is designated as the actuated position. Thus, for example, in the case of a door lock with a bolt preloaded by a spring, the bolt can be in its rest position defined by the preload, in the locked position or the zero position of the lock cylinder, and the bolt can be retracted into the lock housing against the preload in the open position or the actuated position of the lock cylinder. Pedestal locks and two-wheeled vehicle locks are generally provided with a substantially similar operating mode. Here, the bolt moves into the release position or the open position to open the lock via the lock cylinder, so that the closing ring or the pusher previously locked by the bolt is released to be removed from the lock body of the lock. After opening has taken place, the lock cylinder must be rotated back into the locked position or zero position in order to be able to remove the key from the key slot. With some locks of this type, the bolt can be preloaded by spring force in the direction of the locked position. In particular, a so-called automatic function can be provided, in which repeated closing of the lock without key actuation is performed by inserting a closing ring or a pusher into the lock body, whereby the closing ring or the pusher latches onto the bolt. With such a lock, it can also be provided in the usual manner in connection with the invention that the key can be removed from the lock cylinder core only in the locked position or zero position of the lock cylinder core, or only in the locked position or zero position of the lock cylinder core and in a position in which the lock cylinder core is rotated by 180° relative to the lock cylinder core.

Conventional lock cylinders have the property that, when the key is introduced, the lock cylinder core can rotate freely, i.e. in any desired (total) number of rotations. The rotation angle of the lock cylinder core is limited only by a closing mechanism arranged downstream and of the lock in which the lock cylinder is arranged. In particular, the rotation angle is limited by effectively connecting the lock cylinder core to the closing mechanism arranged downstream, for example, by connecting the lock head to the bolt and the lock bolt in a door lock of the above-mentioned type, or by connecting the drive extension of the lock cylinder core to the hoop of the hanging lock. Depending on the production tolerances of the components involved, which lead to movement play of the closing mechanism arranged downstream of the lock barrel core or play between the lock barrel core and the closing mechanism arranged downstream, it may happen that the set rotation angle range of the lock barrel core is not accurately maintained.

In particular, this can result in a slight over-rotation of the lock barrel core when the lock barrel core is turned back into the locked position or zero position, in which the key can be removed from the lock barrel. In lock barrels with a tumbler, this can, for example, result in the core hole in the lock barrel core no longer being aligned exactly with the housing hole in the lock barrel housing, so that each tumbler pin movably accommodated therein is blocked from moving. In particular, the core pin, i.e. the tumbler pin accommodated in the lock barrel core, cannot sink into the housing hole and thus the key cannot be removed from the lock barrel core or from the key slot.

This limits the operating comfort, since the key first has to be slightly turned again in the direction of the zero position before it can be removed.

Considerable problems can arise with cylinder locks with different configurations such as plate tumblers or disc tumblers.

Therefore, the object of the present invention is to provide a lock cylinder that can achieve comfortable operation.

This object is achieved by a lock cylinder having the features of claim 1.

In the lock cylinder according to the present invention, it is provided that the elastic stop ring and the lock cylinder shell together form a rotational adjacent portion for limiting the rotational angle of the lock cylinder core within a predetermined rotational angle range. The rotational angle adjacent portion can limit the rotational angle of the lock cylinder core relative to the lock cylinder shell, especially at two adjacent positions.

Indications of directions referred to in the present invention, such as "radial", "axial", "tangential" or "peripheral direction", usually relate to the barrel axis of the barrel. The terms "in the tangential direction" and "in the peripheral direction" are used synonymously.

In addition, the invention makes use of a spring-loaded circlip which is provided in a surprisingly simple manner for axially fixing the barrel core to the barrel housing to form a rotational abutment which serves to limit the predetermined rotational angle range of the barrel in cooperation with the barrel housing. In terms of technical production, this can be achieved in a simple manner, in particular without additional components.

According to some embodiments, it is provided that the spring-loaded collar is held rotationally fixedly on the lock barrel core. Thus, the spring-loaded collar rotates together with the lock barrel core.

According to another embodiment, the spring-loaded collar has an abutment section which projects radially and/or axially and engages in a free space provided at the barrel housing, which is delimited along a tangent. In particular, the abutment section of the spring-loaded collar can project into the associated free space of the barrel housing in the radial direction, in the axial direction, or in a combination of the radial and axial directions (relative to the barrel axis of the barrel).

According to the embodiment, starting from the base of the spring-type stop ring which has essentially a circle or circle sector shape (e.g. essentially a C-shape), the adjacent portion can protrude axially in the direction of the front side of the lock barrel core or the lock barrel housing directly or via a portion extending radially outwards.

In this embodiment, the head is in the embodiment mentioned below, the snap ring and the adjacent portion of the snap ring are preferably formed as an initial single-piece component, that is, the adjacent portion of the snap ring is integrally formed at the rest of the snap ring in a bonded manner.

In this respect, the adjacent portion can be angled relative to the remainder of the snap ring, in particular at an angle of approximately 90°, the angled portion preferably being formed by a curvature rather than, for example, by an edge. In particular, the connection area of the (in particular axially oriented) adjacent portion to the remainder of the (in particular radially oriented) snap ring can have a partially circular or partially elliptical contour, however, other curvatures are also possible. Due to this curvature, in particular compared to a 90° bend, the stability with respect to torsion is increased.

The adjacent portion may extend axially over at least a portion of the thickness of the spring-loaded retaining ring. In some embodiments, the length of the adjacent portion in the axial direction is preferably greater than the thickness of the spring-loaded retaining ring, and the total length is 1.5 to 4 times the thickness of the spring-loaded retaining ring. Alternatively or additionally, in some embodiments, the length of the adjacent portion in the axial direction may be greater than the gap of the circumferential groove portion of the lock barrel core that accommodates the spring-loaded retaining ring, and is equivalent to 1.5 to 2 times the axial gap of the circumferential groove portion of the lock barrel core.

According to an embodiment, the spring-loaded stop ring with the adjacent portion can be manufactured by a stamping and bending process, in which the spring-loaded stop ring with the adjacent portion is first stamped and then the adjacent portion is bent (so that the adjacent portion is axially oriented relative to the axis of the lock cylinder in the subsequent installation position). However, the spring-loaded stop ring with the adjacent portion can also be manufactured in a casting process (metal casting or plastic injection molding) or can be bent from a metal wire.

In particular, the free space of the lock barrel shell may form a circumferential path defined in the tangential direction, wherein the free space or the circumferential path of the lock barrel shell extends a predetermined circumferential angle and defines the possible rotation angle range of the lock barrel core together with the tangential angle range of the adjacent part. In some embodiments, in particular, the free space or the circumferential path may correspond to a sector-shaped portion of the hollow lock barrel.

The free space or circumferential path of the lock barrel housing can have a corresponding counter-adjacent portion or counter-adjacent part at each tangential end, which counter-adjacent portion or counter-adjacent part cooperates with the adjacent portion of the snap ring in the corresponding end position, in particular, on the one hand in the locked position or zero position and on the other hand in the open position or actuated position of the lock barrel core. Thus, depending on the direction of rotation, the adjacent portion of the snap ring adjoins one or the other counter-adjacent portion of the lock barrel housing along the tangential free space.

Thus, in some embodiments, the free space of the lock barrel shell extends between two opposing adjacent portions of the lock barrel shell, which are spaced apart from each other in the tangential direction. These opposing adjacent portions may be formed integrally with the end face of the lock barrel shell. In some embodiments, the opposing adjacent portions may form a raised portion relative to the substantially extended plane of the end face of the lock barrel shell.

According to another embodiment, the free space of the barrel shell is formed as a recess in a substantially extended plane relative to the end face, which is arranged at the end face of the barrel shell and extends in the axial direction and in the tangential direction. For example, the free space can be formed by a cutout introduced into the barrel shell. The part of the barrel shell with the recess or cutout can be, for example, a wall of the barrel shell, wherein, in particular, the recess can extend over the entire radial extent of the wall.

Alternatively, the free space or circumferential path may be defined by one or two axially and/or radially projecting opposed adjacent portions of the lock barrel housing.

As an alternative to the overall design at the snap ring, the adjacent part can also be designed as a movable element at the snap ring, in particular a resilient or movable element. Thus, in some embodiments, an intermediate latch can also be provided during the rotational movement in the direction of the opposite adjacent part, wherein a corresponding latching element, such as a recess, can be provided.

In other embodiments, the lock barrel housing has an adjacent portion which protrudes in the radial direction and/or in the axial direction and engages in a free space provided at the snap ring, which free space is delimited in the tangential direction. In particular, the adjacent portion of the lock barrel housing can protrude in particular in the radial direction, or in the axial direction, or in a combination of the radial direction and the axial direction into the associated free space of the snap ring.

In particular, the free space defined in the tangential direction can be formed by a release portion of the snap ring extending over a portion of the circumference. The free space or release portion of the snap ring extends over a predetermined circumferential angle and defines, together with the tangential angular range of the adjacent portion of the cylinder housing, the possible angular range of rotation of the cylinder core. The free space or release portion of the snap ring can have a corresponding opposing adjacent portion at each end, which cooperates with the adjacent portion of the cylinder housing in the corresponding end position of the cylinder core, i.e. in the locked position or zero position or in the open position or actuated position. The free space or relief of the snap ring can be formed, for example, by a lateral opening, i.e. a slot-like opening, which is provided in the circumferential region of the snap ring and at the same time allows the snap ring to be pushed onto the cylinder core in the radial direction. In any case, such a slot-like opening in the snap ring can optionally be slightly widened in the circumferential region of the snap ring so that a sufficiently large swivel angle range can be defined.

In some embodiments, the snap ring has a secant portion that contacts the flat portion of the drive extension of the barrel core in order to hold the snap ring at the barrel core in a rotationally fixed manner. Thus, a form fit between the barrel core and the snap ring is ensured, so that even greater forces or torques generated in the respective adjacent positions by the rotational actuation of the barrel core can be reliably guided from the barrel core to the barrel housing, and a play-free fit is also ensured.

According to an embodiment, the rotational adjacent portion is configured so that one of the two adjacent positions of the lock cylinder core that limits the rotation angle coincides with the locking position of the lock cylinder core. The key can be removed from the key slot in this locking position or zero position, in particular only in this locking position or zero position. Through this design, it can be ensured that the bullet bolt, in particular the bullet pin, can sink into the corresponding housing hole or housing recess, so that the key can be removed. Thus, a defined end position is provided for the lock cylinder core, so that the initially mentioned over-rotation of the lock cylinder core can be reliably prevented.

The predetermined rotation angle range of the lock cylinder core can advantageously amount to more than 180°, or equal to 180°, or less than 180°, in particular equal to 120°. An angular range of less than 180° is sufficient for many applications. If a rotation angle range of 180° or more is provided, the lock cylinder can be configured as a so-called re-codeable lock cylinder. With such a lock cylinder, after initial assembly with the bullet bolt, the lock cylinder can also be adapted to keys with different locking profiles by replacing the bullet bolt. In particular, it can be provided that a bullet pin or core pin initially provided in the lock cylinder core is replaced by a bullet pin or core pin of a different length. This process is also referred to as rekeying. Recodeable locks are described, for example, in document US6425274B1. In such a recodeable lock barrel, the lock barrel housing has a groove-shaped recess or a plurality of individual holes on the upper side, i.e. on the side arranged opposite the housing hole, which enables the core pin to be removed from the lock barrel core when the lock barrel core is in a position rotated 180° relative to the locking position or zero position. If the predetermined rotation angle range of the lock barrel core amounts to exactly 180°, and in particular, this rotation angle position coincides with one of the adjacent positions limiting the rotation angle, the recoding process or rekeying process is greatly simplified, since the lock barrel core can be rotated exactly into the removal position for the core pin.

In some embodiments, the bullet bolt is configured as a pin bullet bolt, a plate bullet bolt, or a disc bullet bolt.

The spring-loaded stop can advantageously be manufactured as a stamped bent piece and/or from spring steel. However, as already mentioned, the spring-loaded stop can also be configured at least partially as a cast component, cast from plastic, or bent from a metal wire.

In some embodiments, it can be provided that the spring-loaded retaining ring is provided at the end of the key introduction opening of the lock core away from the key slot, in particular, at the rear side of the lock core.

In some embodiments, it can be provided that the elastic stop ring is provided at the driving extension portion of the lock barrel core extending axially from the lock barrel shell.

In some embodiments, it may be provided that the lock barrel core has at least one circumferential groove portion, in which the spring-shaped retaining ring is engaged to fix the lock barrel core to prevent the lock barrel core from axially moving relative to the lock barrel.

In some embodiments, it can be provided that the elastic stop ring is arranged outside the lock cylinder shell along the axial direction.

In some embodiments, it can also be provided that the elastic retaining ring has a radial groove, and the elastic retaining ring can elastically expand along the radial groove to place the elastic retaining ring on the lock cylinder core in the radial direction.

In some embodiments, it can be provided that the elastic stop ring has a wide side, and the elastic stop ring contacts the axial end surface of the lock barrel shell through the wide side.

Further embodiments of the invention result from the dependent claims, the description and the drawings. In this respect, those features which are not explicitly described as being in combination may also be advantageously combined with one another.

10: Lock cylinder

12: Lock cylinder case

14: Shell hole

16:Entry hole

18: Attachment part

20: Cylindrical part

24: Free space

26a: Opposite adjacent part

26b: Opposite adjacent part

30: Lock cylinder core

32: Key slot

34: Drive extension unit

36: Groove part

37: Shaft ring part

38: Flat part

40: Elastic retaining ring

42: Neighboring part

44: Radial groove

48: Secant part

The present invention will be described below with reference to the implementation method and drawings. In the drawings:

Figure 1 shows a three-dimensional view of a lock cylinder in a locked position according to one embodiment;

Figure 2 shows a three-dimensional view of the lock barrel in the open position;

Figure 3 shows an exploded perspective view of the lock cylinder;

Figure 4 shows a side view of the lock barrel; and

Figure 5 shows a plan view of the upper side of the lock barrel.

Figures 1 to 5 show a lock barrel 10 according to an embodiment of the present invention in different views. The lock barrel 10 comprises a lock barrel shell 12 having a hollow cylindrical portion 20 and a transverse attachment portion 18 integrally adjacent to the hollow cylindrical portion 20.

A plurality of housing holes 14 are provided in the attachment portion 18 and extend to the interior of the cylindrical portion 20 (FIG. 3).

The hollow cylindrical part 20 has a plurality of access holes 16 in the form of radial passage holes introduced into the wall of the hollow cylindrical part 20 opposite the housing hole 14.

The lock barrel core 30 is accommodated in the hollow cylindrical part 20 and is thereby supported rotatably in the lock barrel housing 12 about the lock barrel axis. In the assembled position, the lock barrel core 30 is fixed axially by a circumferential shaft ring part 37 on the front side and a flat spring-type stop ring 40 on the rear side. The spring-type stop ring 40 is accommodated in a groove part 36 introduced circumferentially of the lock barrel core 30. The lock barrel core 30 also has a key groove 32 extending along the lock barrel axis for receiving a key (not shown).

The rear end of the lock barrel core 30 is configured as a drive extension 34, which enables the lock barrel 10 to be connected to the closing mechanism of the lock arranged downstream. In the assembled position, the drive extension 34 protrudes from the lock barrel shell 12, that is, the drive extension 34 protrudes on the axial rear end face of the lock barrel shell 12.

The spring-type stop ring 40 has a wide radial groove 44 that enables the spring-type stop ring 40 to be radially inserted onto the lock barrel core 30. After the lock barrel core 30 is inserted into the hollow cylindrical portion 20, the spring-type stop ring 40 can be radially introduced into the groove portion 36 and can be latched in the groove portion 36. Thus, the lock barrel core 30 is fixed to prevent axial movement in the direction of its front side relative to the lock barrel housing 12.

In the region of the radial groove 44, a secant section 48 is formed at the snap ring 40, which contacts the flat section 38 formed at the drive extension 34, thereby rotationally fixing the snap ring 40 to the lock cylinder core 30.

The recessed portion 36 of the lock barrel core 30 need not be exactly circular, but may have a radially inward recess into which the radially inward raised portion of the snap ring 40 engages to secure the snap ring 40 from inadvertent radial removal from the lock barrel core 30.

The tangentially extending free space 24 formed by the radial recess of the barrel housing 12 is arranged on the axial end face of the barrel housing 12, which faces the drive extension 34 in the region of the hollow cylindrical part 20.

The adjacent portion 42 is formed integrally at the snap ring 40 and extends slightly in the radial direction and then mainly away from the other portion of the snap ring 40 in the axial direction. The connecting area of the adjacent portion or the transition from the radial extension direction to the axial extension direction preferably has a part-circular or quarter-elliptical contour. Thus, the outer side of the formed curve can be rounded without forming a sharp edge.

Therefore, the adjacent portion 42 protrudes axially from the other parts of the snap ring 40 and engages in the free space 24 of the cylinder housing 12. The adjacent portion 42 moves in the free space 24 of the cylinder housing 12 when the cylinder core 30 rotates, wherein the two opposing adjacent portions 26a, 26b that bound the free space 24 in the circumferential direction form a rotational neighbor together with the adjacent portion 42 of the snap ring 40, thereby limiting the possible rotation angle range of the cylinder core 30 rotationally fixedly connected to the snap ring 40.

Two adjacent positions defined by the adjacent portion 42 of the spring-loaded stopper 40 and the opposing adjacent portions 26a, 26b of the lock barrel housing 12 are selected so that when the adjacent portion 42 is adjacent to one opposing adjacent portion 26a, the lock barrel core 30 is in a locked position or a zero position. In this locked position or zero position of the lock barrel core 30, the key can be removed from the key slot 32. In addition, two adjacent positions are selected so that when the adjacent portion 42 of the spring-loaded stopper 40 is adjacent to the other opposing adjacent portion 26b of the lock barrel housing 12, the lock barrel core 30 is in an open position or an actuated position. In the embodiment shown, the rotation angle range is limited to approximately 120°.

If the snap ring 40 is released from the lock barrel core 30 or (by means of a sufficiently elastic arrangement) the adjacent part 42 of the snap ring 40 is pushed back from the free space 24 of the lock barrel housing 12, the lock barrel core 30 can be rotated beyond the rotation angle range defined by the rotational adjacent part and in particular can be brought into a position rotated by 180° relative to the locked position or zero position, so that, according to one embodiment, a pin or core pin (not shown) accommodated in the lock barrel core 30 for recoding purposes can be removed through the access hole 16 and replaced by a pin or core pin of a different length.

According to another embodiment, if the angular extension of the free space 24 is correspondingly extended (to 180° or more), the above-mentioned position for recoding the lock cylinder 10 can also be accessed without removing the spring-loaded stop ring 40. However, in this variant, it should be ensured that the recoding position is not inadvertently accessed by the closing mechanism of the relevant lock arranged downstream, otherwise (depending on the installation position of the lock cylinder 10) it cannot be ruled out that the spring pin accidentally falls out.

10: Lock cylinder

12: Lock cylinder case

18: Attachment part

20: Cylindrical part

24: Free space

26a: Opposite adjacent part

26b: Opposite adjacent part

30: Lock cylinder core

34: Drive extension unit

38: Flat part

40: Elastic retaining ring

42: Neighboring part

Claims (15)

A lock barrel (10) comprises a lock barrel shell (12) and a lock barrel core (30), wherein the lock barrel core (30) is supported in the lock barrel shell (12) so as to be rotatable about the lock barrel axis, and the lock barrel core (30) is fixed by a spring-shaped stop ring (40) to prevent axial movement relative to the lock barrel shell (12), wherein the lock barrel core (30) has a spring-shaped stop ring (40) for introducing The invention relates to a key slot (32) of an associated key, wherein the lock cylinder core (30) can be rotated between a locked position and an unlocked position by an introduced key, and wherein the lock cylinder (10) has a plurality of bullet bolts, which can be actuated by the associated key, wherein the spring-shaped stop ring (40) and the lock cylinder shell (12) together form a rotational adjacent portion for rotating the lock cylinder. The rotation angle of the lock cylinder core (30) is limited within a predetermined rotation angle range, wherein the elastic retaining ring (40) can be rotatably and fixedly held on the lock cylinder core (30), wherein the elastic retaining ring (40) has an adjacent portion (42) that protrudes in a radial direction and/or an axial direction, wherein the adjacent portion (42) is in contact with the lock cylinder core (30). The lock barrel shell (12) is engaged in a free space (24) provided at the lock barrel shell (12), and the free space (24) is defined in the tangential direction, wherein the free space (24) of the lock barrel shell (12) is formed as a recess relative to the end surface of the lock barrel shell (12), and the recess is provided at the end surface of the lock barrel shell (12) and extends along the axial direction and the tangential direction. The lock cylinder (10) as claimed in claim 1, wherein the adjacent portion (42) extends along the axial direction over at least a portion of the thickness of the elastic stop ring (40). The lock cylinder (10) as described in claim 1, wherein the length of the adjacent portion (42) in the axial direction is greater than the thickness of the elastic stop ring (40). The lock barrel (10) as claimed in claim 1, wherein the lock barrel core (30) has at least one circumferential groove portion (36), the elastic stop ring (40) is engaged in the circumferential groove portion (36) to fix the lock barrel core (30) to prevent axial movement relative to the lock barrel shell (12), wherein the length of the adjacent portion (42) in the axial direction is greater than the gap of the circumferential groove portion (36). The lock barrel (10) as claimed in claim 1, wherein the free space (24) of the lock barrel shell (12) extends between two opposing adjacent portions of the lock barrel shell (12), and the two opposing adjacent portions are spaced apart from each other in the tangential direction. A lock cylinder (10) as claimed in claim 1 or 2, wherein the spring-loaded stop ring (40) has a secant portion (48) in contact with the flat portion (38) of the drive extension (34) of the lock cylinder core (30) to hold the spring-loaded stop ring (40) at the lock cylinder core (30) in a rotationally fixed manner. A lock cylinder (10) as claimed in claim 1 or 2, wherein the rotational adjacent portion is configured so that one of the two adjacent positions that limit the rotational angle coincides with the locking position of the lock cylinder core (30). A lock cylinder (10) as claimed in claim 1 or 2, wherein the total predetermined rotation angle range of the lock cylinder core (30) is less than 180°. The lock cylinder (10) as claimed in claim 1 or 2, wherein the bullet bolt is configured as a pin bullet bolt, a plate bullet bolt or a disc bullet bolt. The lock cylinder (10) as claimed in claim 1 or 2, wherein the elastic stop ring (40) is formed as a stamped curved piece. The lock cylinder (10) as claimed in claim 1 or 2, wherein the elastic stop ring (40) is arranged at the end of the key introduction port of the lock cylinder core (30) away from the key slot (32). A lock barrel (10) as claimed in claim 1 or 2, wherein the elastic stop ring (40) is arranged at the drive extension (34) of the lock barrel core (30), and the drive extension (34) protrudes axially from the lock barrel shell (12). The lock cylinder (10) as described in claim 1 or 2, wherein the elastic stop ring (40) is arranged outside the lock cylinder shell (12). The lock cylinder (10) as described in claim 1 or 2, wherein the elastic stop ring (40) has a radial groove (44), and the elastic stop ring (40) can expand elastically along the radial groove (44) to place the elastic stop ring (40) on the lock cylinder core (30) in the radial direction. The lock cylinder (10) as described in claim 1 or 2, wherein the elastic stop ring (40) has a wide side, and the elastic stop ring (40) contacts the axial end surface of the lock cylinder shell (12) through the wide side.

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