Lock cylinder with key trigger lock

Abstract

The invention relates to a locking cylinder (10) having a key withdrawal lock, a cylinder housing (11), and a cylinder core (12) rotatably mounted in the cylinder housing (11), wherein a reversible key can be inserted into a keyway (13) of the cylinder core (12), and wherein an annular disc (20) is arranged in a stationary manner behind a cylinder core head (14), wherein the annular disc (20) has at least one axial, groove-like cutout (23) on the inner circumference (21), and wherein the reversible key has grooves on the key shank that extend opposite one another in the radial direction, the dimensions of which correspond to the groove-like cutout (23) of the annular disc (20), and whose position in the axial longitudinal direction on the key shank enables the reversible key, when fully inserted into the keyway (13), to be rotated relative to the stationary annular disc (20).The annular disc (20) has a pin (24) on the outer circumference (22), wherein the pin (24) engages in a groove (31) of a sliding block (30) fixedly arranged on the cylinder housing (11), so that the annular disc (20) is arranged essentially in a stationary manner.

Description

[0001] The invention relates to a locking cylinder with a key withdrawal lock according to the features of the preamble of claim 1.

[0002] EP 2 931 995 B1 discloses a locking cylinder with a key withdrawal lock in the form of an annular disc. The disc is attached directly to the cylinder housing. For this purpose, the disc has a protrusion on its circumference in the shape of a circular segment. The cylinder housing has a retaining groove along its length, through which the disc is inserted into the cylinder housing. A disadvantage of this design, however, is that there is excessive play between the retaining groove and the curvature of the disc, which increases the risk of tampering with the locking cylinder.

[0003] It is therefore the object of the present invention to provide a locking cylinder with a key withdrawal lock which has increased security against opening manipulation in the area of ​​the key withdrawal lock.

[0004] This object is achieved according to the invention by a locking cylinder having the features of claim 1.

[0005] According to the invention, a locking cylinder is provided, comprising a key withdrawal lock, a cylinder housing and a cylinder core rotatably mounted in the cylinder housing, wherein a reversible key can be inserted into a keyway of the cylinder core, and wherein an annular disc is arranged in a stationary manner behind a cylinder core head, wherein the annular disc has at least one axial, groove-like cutout on the inner circumference, and wherein the reversible key has grooves on the key shank extending opposite one another in the radial direction, the dimension of which corresponds to the groove-like cutout of the annular disc and whose position in the axial longitudinal direction on the key shank enables the reversible key, when fully inserted into the keyway, to be rotated relative to the stationary annular disc.

[0006] What is essential in the locking cylinder according to the invention is that the annular disc has a pin on the outer circumference, wherein the pin engages in a groove of a sliding block fixedly arranged on the cylinder housing, so that the annular disc is arranged essentially in a stationary manner.

[0007] The object is further achieved by a lock-key system according to claim 10, comprising a reversible key and a locking cylinder, wherein the reversible key can be inserted into a keyway of a cylinder core of the locking cylinder, and wherein an annular disc is arranged in a stationary manner behind a cylinder core head, wherein the annular disc has at least one axial, groove-like cutout on the inner circumference, and wherein the reversible key has grooves on the key shank which extend opposite one another in the radial direction, the dimension of which corresponds to the groove-like cutout of the annular disc and whose position in the axial longitudinal direction on the key shank enables the reversible key, when fully inserted into the keyway, to be rotated relative to the stationary annular disc.What is important here is that the annular disc has a pin on the outer circumference, wherein the pin engages in a groove of a sliding block fixedly arranged on the cylinder housing, so that the annular disc is arranged essentially in a stationary manner.

[0008] The locking cylinder with key removal lock according to the invention, as well as the lock-key system, offers the advantage that certain opening manipulations are no longer possible due to the reduced play of the annular disc. Due to the reduced play compared to the prior art, it is no longer possible to penetrate the cylinder core with a suitable tool. Furthermore, the combination of sliding block and annular disc offers a cost-effective way of implementing a key removal lock. This design reduces manufacturing costs because waste is significantly reduced. Furthermore, the key can only be removed in the removal position(s) defined by the annular disc.

[0009] The cylinder core head refers to the outer side of the cylinder core, where the key is inserted into the keyway. The cylinder core may also have a cylinder core head on two opposite sides.

[0010] By "stationary" we mean that the annular disc is arranged in a manner that prevents rotation and displacement. This means that the disc's position cannot be changed.

[0011] "Substantially stationary" means that the annular disc is arranged in a stationary manner within the manufacturing tolerances and / or the permissible play.

[0012] The term "stationary" preferably also means that the annular disc is arranged in a stationary manner relative to the cylinder housing.

[0013] In particular, the T-slot nut can be provided with a lateral web that interacts with a groove in the cylinder housing. The geometry of the web essentially corresponds to the open geometry of the groove in the cylinder housing.

[0014] Preferably, the web of the T-slot nut is pressed into the groove of the cylinder housing. This can be, for example, a transition fit or an interference fit. A press fit is preferred. This ensures a tight fit of the T-slot nut on the cylinder housing, so there is virtually no play and the risk of tampering with the opening is reduced.

[0015] It is also possible for the T-slot nut to be a stamped part. In this case, the T-slot nut is preferably punched out of sheet steel. The T-slot nut can therefore be manufactured cost-effectively. Alternatively, the T-slot nut can also be a milled part, a 3D-printed part, a cast part, or a sheet metal part manufactured using cutting technology, particularly water and / or laser cutting.

[0016] In particular, the annular disc is provided with several groove-like cutouts distributed around its inner circumference, each of which provides defined key withdrawal positions. This allows the key to be inserted or removed from the cylinder lock at different angles. However, it is preferred that the annular disc has a groove-like cutout at the 0° or 360° position. This is also referred to as the zero position, which is commercially available.

[0017] Preferably, the annular disc is made of a drill-resistant material. For example, this can be hardened or hardenable steel, hard metals, ceramic materials, or ceramic composite materials. By choosing drill-resistant materials, manipulation of the opening by drilling is prevented or made more difficult.

[0018] Preferably, the pin of the annular disc is fitted into the groove of the sliding block by means of a clearance fit or a transition fit. It may be possible for the geometry of the pin of the annular disc to be designed to correspond to the geometry of the groove of the sliding block. Preferably, the pin of the annular disc is pressed into the groove of the sliding block by means of a transition fit or a press fit. This results in very little play, in particular in the range of 0.001 mm to 0.5 mm, preferably 0.001 mm to 0.095 mm, between the groove and the annular disc. This further increases security against tampering and is also a cost-effective manufacturing technique.

[0019] It may also be possible for the reversible key to be arranged within the keyway in such a way that the rotational path of its axis of symmetry running in the key shank is at a distance from the axis of rotation of the cylinder core, whereby the distance which leads to an eccentricity of the rotation of the reversible key relative to the axis of rotation of the cylinder core is smaller than the depth of the groove-like cutout in the annular disc. This ensures that the key can only be inserted and removed in its intended withdrawal position. In other words, this means that when the reversible key is inserted in the withdrawal position or zero position, the key shank of the reversible key penetrates the groove-like cutout in the annular disc. When the reversible key is fully inserted, the radial grooves of the reversible key are now in the position of the annular disc.The keyway is preferably arranged with an eccentricity, in particular with an offset, to the rotation axis of the cylinder core. As a result, when the locking process is carried out and the key is fully inserted into the keyway, the key shank rotates eccentrically relative to the annular disc. When the key is turned, this inevitably results in an undercut of the radial grooves of the reversible key and the annular disc due to the different axes of the reversible key and the center point of the annular disc or the cylinder core. The eccentricity is limited by the depth of the grooves in the key shank. This measure ensures that the key can only be withdrawn from the keyway in the withdrawal position or zero position, thus implementing the key withdrawal lock function.

[0020] The locking cylinder and lock-key system according to the invention are primarily used in electronic locks. Here, the key is coded purely electronically, meaning that a holding mechanism using mechanical cylinder pins is eliminated in these systems. However, to ensure that the key can only be removed in one or more defined positions, a key removal lock, such as that provided by the locking cylinder according to the invention, is required.

[0021] The invention will be explained below using several exemplary embodiments with the aid of the accompanying drawings. The exemplary embodiments shown are therefore not to be understood as limiting. In the drawings: Fig. 1: a schematic representation of a locking cylinder in a sectional view; Fig. 2: a schematic representation of a three-dimensional diagram of a sliding block; Fig. 3: a schematic representation of an annular disc; Fig. 4: a schematic representation of a three-dimensional diagram of a cylinder core with a sliding block and annular disc.

[0022] The figures illustrate various examples of embodiments of the invention. Identical or equivalent components have been provided with the same reference symbols. Where the embodiments illustrated in the figures have common features, these common features have been omitted from being described multiple times to avoid repetition. The respective differences between the embodiments are described in relation to the figures. It goes without saying that a person skilled in the art can modify individual embodiments or combine individual features of these embodiments within the scope of the claims.

[0023] Fig. 1 shows a schematic representation of a locking cylinder 10 in a sectional view. The locking cylinder 10 has a key withdrawal lock, a cylinder housing 11, and a cylinder core 12 rotatably mounted in the cylinder housing 11, wherein a reversible key can be inserted into a keyway 13 of the cylinder core 12. The key withdrawal lock preferably comprises an annular disc 20 and a sliding block 30. The annular disc 20 is arranged in a fixed position behind the cylinder core head 14. For this purpose, the annular disc 20 has a pin 24 on its outer circumference 22, wherein the pin 24 engages in a groove 31 of the sliding block 30 fixedly arranged on the cylinder housing 11.

[0024] In Fig. 2 The sliding block 30 is shown schematically in a three-dimensional view. The sliding block 30 according to Fig. 2 has a groove 31 which cooperates with a pin 24 of the annular disc 20. Furthermore, the sliding block 30 comprises Fig. 2 a lateral web 32 that interacts with a groove in the cylinder housing 11. For example, the lateral web 32 of the sliding block 30 can be pressed into the groove of the cylinder housing 11. This can be a press fit or a transition fit, which allows virtually no play between the sliding block 30 and the cylinder housing 11.

[0025] In the Fig. 2 The sliding block 30 shown is preferably a stamped part. This allows the sliding block 30 to be manufactured cost-effectively and dimensionally accurate. In an alternative embodiment, however, the sliding block 30 can also be manufactured as a milled part, cast part, 3D-printed part, or a sheet metal part manufactured using cutting technology, in particular water and / or laser beam.

[0026] In Fig. 3 The annular disc 20 is shown schematically in a front view. As in Fig. 3 As shown, the annular disc 20 has at least one axial, groove-like cutout 23 on the inner circumference 21. The reversible key inserted into the cylinder lock has grooves on the key shank that extend opposite one another in the radial direction, the dimensions of which correspond to the groove-like cutout 23 of the annular disc 20 and whose position in the axial longitudinal direction on the key shank enables the reversible key, when fully inserted into the key channel 13, to be rotated relative to the stationary annular disc 20. When the reversible key is inserted in the withdrawal position or zero position, the key shank can penetrate through the groove-like cutout 23 of the annular disc. When the reversible key is fully inserted, the radial grooves of the reversible key are now in the position of the annular disc 20. The key channel 13, into which the reversible key is inserted oris preferably arranged eccentrically to the rotational axis of the cylinder core 12, so that the key shaft rotates eccentrically relative to the annular disc 20 when the locking process is carried out by turning the key. The eccentricity is limited by the depth of the grooves in the key shaft. This measure ensures that the key can only be removed from the keyway 13 in the withdrawal or zero position.

[0027] Furthermore, the annular disc 20 according to Fig. 3 on the outer circumference 22, a pin 24. This pin 24 engages in a groove 31 of a sliding block 30 fixedly arranged on the cylinder housing 11, so that the annular disc 20 is fixedly arranged in the cylinder housing 11. Here, too, the pin 24 can be pressed into the groove 31 of the sliding block 30 by means of a press fit or a transition fit. This essentially allows no play between the annular disc 20 and the sliding block 30. This is positive for the tamper protection of the cylinder lock.

[0028] In an alternative embodiment, it can be provided that the annular disc 20 has a plurality of groove-like cutouts 23 distributed over the inner circumference 21, each of which results in defined key withdrawal positions.

[0029] Preferably, the annular disc 20 is formed from a drill-resistant material.

[0030] In Fig. 4A cylinder core 12 with a sliding block 30 and an annular disc 20 without a cylinder housing 11 is shown in a schematic representation. The annular disc 20 is arranged behind the cylinder core head 14 and is held in place by the sliding block 30 in the cylinder housing 11 (not shown). List of reference symbols

[0031] 10Lock cylinder 11Cylinder housing 12Cylinder core 13Key channel 14Cylinder core head 20annular disc 21inner circumference 22outer circumference 23cutout 24pin 30Slot nut 31Nut 32lateral web

Claims

1. Lock cylinder (10) comprising a key withdrawal lock, a cylinder housing (11), and a cylinder core (12) rotatably mounted in the cylinder housing (11), wherein a reversible key can be inserted into a keyway (13) of the cylinder core (12), and wherein an annular disc (20) is arranged in a stationary manner behind a cylinder core head (14), wherein the annular disc (20) has at least one axial, groove-like cutout (23) on the inner circumference (21), and wherein the reversible key has opposite grooves on the key shank extending in the radial direction, the dimensions of which correspond to the groove-like cutout (23) of the annular disc (20), and whose position in the axial longitudinal direction on the key shank enables rotation of the reversible key, when fully inserted into the keyway (13), relative to the stationary annular disc (20), characterized by thatthe annular disc (20) has a pin (24) on the outer circumference (22), wherein the pin (24) engages in a groove (31) of a sliding block (30) fixedly arranged on the cylinder housing (11), so that the annular disc (20) is arranged essentially in a stationary manner.

2. Lock cylinder (10) according to claim 1, characterized by that the sliding block (30) has a lateral web (32) which cooperates with a groove in the cylinder housing (11).

3. Lock cylinder (10) according to claim 2, characterized by that the web (32) of the sliding block (30) is pressed into the groove of the cylinder housing (11).

4. Lock cylinder (10) according to one of the preceding claims, characterized by that the sliding block (30) is a stamped part or a milled part or a cast part or a 3D printed part or a sheet metal part manufactured by means of cutting technology, in particular water and / or laser beam.

5. Lock cylinder (10) according to one of the preceding claims, characterized by that the annular disc (20) has a plurality of groove-like cutouts (23) distributed over the inner circumference (21), each of which results in defined key removal positions.

6. Lock cylinder (10) according to one of the preceding claims, characterized by that the annular disc (20) is made of a drill-resistant material.

7. Lock cylinder (10) according to one of the preceding claims, characterized by that the pin (24) of the annular disc (20) is fitted into the groove (31) of the sliding block (30) by means of a clearance fit or transition fit.

8. Lock cylinder (10) according to one of the preceding claims, characterized by thatthe reversible key is arranged within the key channel (13) in such a way that the rotational path of its axis of symmetry running in the key shank runs at a distance from the axis of rotation of the cylinder core (12), wherein the distance which leads to an eccentricity of the rotation of the reversible key with respect to the axis of rotation of the cylinder core (12) is smaller than the depth of the groove-like cutout (23) of the annular disc (20).

9. Lock cylinder (10) according to one of the preceding claims, characterized by that the key channel (13) is arranged with an eccentricity, in particular with an offset, to the axis of rotation of the cylinder core (12).

10. A lock-key system comprising a reversible key and a locking cylinder (10) according to one of the preceding claims, wherein the reversible key is insertable into a keyway (13) of a cylinder core (12) of the locking cylinder (10), and wherein an annular disc (20) is arranged in a stationary manner behind a cylinder core head (14), wherein the annular disc (20) has at least one axial, groove-like cutout (23) on the inner circumference (21), and wherein the reversible key has opposite grooves on the key shaft extending in the radial direction, the dimensions of which correspond to the groove-like cutout (23) of the annular disc (20) and whose position in the axial longitudinal direction on the key shaft enables rotation of the reversible key, when fully inserted into the keyway (13), relative to the stationary annular disc (20). characterized by thatthe annular disc (20) has a pin (24) on the outer circumference (22), wherein the pin (24) engages in a groove (31) of a sliding block (30) fixedly arranged on the cylinder housing (11), so that the annular disc (20) is arranged essentially in a stationary manner.

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