Lock cylinder with clutch

Abstract

The invention relates to a locking cylinder (2), in particular a double-profile cylinder, comprising a cylinder housing (3) in which at least one cylinder core (4) is rotatably mounted, a locking bit (5) which is rotatably mounted within a locking bit groove (6) arranged on the cylinder housing (3), and a coupling adapter (7) arranged between the at least one cylinder core (4) and the locking bit (5), which is mounted in the cylinder core (4) in a rotationally fixed and axially displaceable manner, wherein the locking bit (5) can be coupled to a key (18) which can be inserted into a key channel of the at least one cylinder core (4) in order to carry out a common locking process which triggers the locking function, in that the coupling adapter (7) can be brought into positive engagement with the locking bit (5) by an axial displacement of the coupling adapter (7) caused by the key tip of the inserted key (18).The coupling adapter (7) has a support element (8) with which the coupling adapter (7) is supported on a cylinder housing surface (17) of the locking bit groove (6) when the locking process is carried out.

Description

[0001] The invention relates to a locking cylinder with a coupling.

[0002] From DE 10 2020 119 735 A1, a locking cylinder with an engaging locking bolt is known. A coupling adapter is provided between the locking bolt and the cylinder core. This coupling adapter is rotationally fixed to the cylinder core but is axially displaceable towards the locking bolt by the tip of a key inserted into the keyway. When the key is inserted, the locking bolt is thus rotationally locked to the cylinder core. When the key is removed, the locking bolt, under load, pushes the coupling out, allowing the locking bolt to move freely.

[0003] This refers to the FZG function, which is necessary for escape door gearbox locks. However, a disadvantage of this solution is that when the cylinder is closed, the force is pushed out of the cylinder by the force feedback via the clutch adapter, which can lead to increased friction and even cause the cylinder to jam.

[0004] It is therefore the object of the present invention to provide a locking cylinder with a coupling for realizing the FZG function, which reduces or avoids the acting return force on the key.

[0005] This problem is solved according to the invention by a locking cylinder with the features of claim 1.

[0006] According to the invention, a locking cylinder, in particular a double profile cylinder, is provided, comprising a cylinder housing in which at least one cylinder core is rotatably mounted, a locking bolt which is rotatably mounted within a locking bolt groove arranged on the cylinder housing, and a coupling adapter arranged between the at least one cylinder core and the locking bolt, which is mounted in the cylinder core in a rotationally fixed and axially displaceable manner, wherein the locking bolt can be coupled with a key which can be inserted into a key channel of the at least one cylinder core for the execution of a common locking operation that triggers the locking function, in that the coupling adapter can be brought into positive engagement with the locking bolt by an axial displacement of the coupling adapter caused by the key tip of the inserted key.

[0007] A key feature of the locking cylinder according to the invention is that the coupling adapter has a support element with which the coupling adapter is supported against a cylinder housing surface of the locking bar groove when the locking process is carried out.

[0008] The problem is further solved by a lock-key system according to claim 13, comprising a key and a locking cylinder, in particular a double profile cylinder, wherein the locking cylinder has a cylinder housing in which at least one cylinder core is rotatably mounted, a locking bolt which is rotatably mounted within a locking bolt groove arranged on the cylinder housing, and a coupling adapter arranged between the at least one cylinder core and the locking bolt, which is mounted in the cylinder core in a rotationally fixed and axially displaceable manner, wherein the locking bolt can be coupled with the key which can be inserted into a key channel of the at least one cylinder core for the execution of a common locking operation that triggers the locking function, in that the coupling adapter can be brought into positive engagement with the locking bolt by means of an axial displacement of the coupling adapter caused by the key tip of the inserted key.The essential feature is that the coupling adapter has a support element with which the coupling adapter is supported against a cylinder housing surface of the locking bar groove during the execution of the closing process.

[0009] The locking cylinder with coupling and the lock-key system according to the invention ensures that, as soon as the cylinder core is closed from its neutral position, the support element of the coupling adapter rests against the cylinder housing surface of the locking bolt groove. This reduces or eliminates the return force acting on the key and thus prevents cylinder jamming. Furthermore, the support element ensures the reliable operation of the locking cylinder and the vehicle's function, i.e., the locking bolt can disengage under load.

[0010] The term "zero position" refers to the position of the cylinder core in which the key is inserted into and / or removed from the keyway. Preferably, this is the 0° position. Preferably, the zero position lies in the center plane of the cylinder core or the lock cylinder.

[0011] Preferably, the coupling adapter is designed to be mirror-symmetrical, in particular mirror-symmetrical with respect to a central plane.

[0012] In particular, the cylinder housing may have a radial groove extending from the locking bar groove. Preferably, the radial groove is located on the top of the cylinder housing. Furthermore, the radial groove may extend towards the neutral position. Preferably, the support element of the coupling adapter interacts with the radial groove when the key is removed. For this purpose, the internal geometry of the radial groove essentially corresponds to the external geometry of the support element, with the internal geometry being larger than the support element. This provides a certain amount of play, allowing the support element to easily engage the radial groove when the key is removed. Preferably, the support element only interacts with the radial groove when the key is removed.When the key is removed, the coupling adapter is preferably uncoupled from the locking bar by the coupling adapter moving axially towards the cylinder core, allowing the support element of the coupling adapter to plunge into the radial groove.

[0013] In particular, the radial groove is provided to have chamfers. Preferably, these chamfers are bevels, which are preferably arranged at the opening of the radial groove.

[0014] It is also possible for the coupling adapter to have a base body, in particular a cylindrical base body, and a cutting element arranged laterally to the base body, with the support element arranged laterally on the cutting element. Preferably, the coupling adapter is arranged such that the support element is directed towards the core of the cylinder.

[0015] Preferably, the support element may be designed in the form of a nose or a pin.

[0016] It is also possible that the support element has a first functional area and a second functional area on a side facing the cylinder core.

[0017] In particular, it is possible that the first functional area is arranged on the two outer areas of the support element, wherein the first functional area is formed from two doubly inclined surfaces, and in particular, wherein the two doubly inclined surfaces are arranged symmetrically to the central plane of the coupling adapter. By means of the first functional area, in particular the doubly inclined surfaces, it is ensured that the coupling adapter, during the closing process under load, presses into the closing bolt via the leading edges of the radial groove in the cylinder housing. The first functional area, in particular the doubly inclined surfaces, is / are designed such that, under load, surface contact is established between the support element and the leading edges of the radial groove in the cylinder housing. This prevents the coupling from jamming.of the coupling adapter and has a positive effect on the wear of the running-in chamfers in the cylinder housing.

[0018] It can also be provided that the second functional area is arranged in a central region of the support element, wherein the second functional area is formed by two angled surfaces extending from the central plane. Preferably, the central region is arranged between the two outer regions of the first functional area. In other words, this means that the second functional area is arranged between the first functional area. Furthermore, it is possible that the two surfaces of the second functional area each form an angle with the central plane of the coupling adapter in a range of 85° to 89.8°, in particular from 88° to 89.5°, preferably from 89° to 89.4°. Normally, the coupling adapter is mounted with a small amount of play on the cylinder core. This play can be compensated for by the two angled surfaces.The second functional area, in particular the two angled surfaces, therefore ensures surface contact between the support element and the cylinder housing surface in the locking lug groove of the cylinder housing when the cylinder core is in a load position other than its neutral position. This surface contact minimizes wear and prevents the support element from embedding itself into the cylinder housing surface in such a way that the coupling blocks the cylinder core.

[0019] Preferably, the cutting element can be designed to interact with at least one corresponding coupling geometry provided in the locking bolt. Preferably, a coupling geometry is provided on both sides of the locking bolt. It is also preferred that the locking bolt has a recess on both sides, with the coupling geometry protruding from the recess. Preferably, the corresponding coupling geometry corresponds substantially to the outer contour of the cutting element. Depending on the number of coupling geometries in the locking bolt, a possible free rotation angle results. That is, when the key is inserted and the coupling adapter is thereby pressed into the locking bolt, the cutting element of the coupling adapter only contacts the corresponding coupling geometry in the locking bolt after a certain free rotation and consequently transmits a torque. Preferably, this connection is a positive-locking connection.If the lock cylinder is designed as a double profile cylinder, it is preferably intended that the double profile cylinder can be locked from both sides simultaneously. Even if a key is inserted on the inside of the double profile cylinder, it can still be unlocked from the outside, i.e., the inside side rotates. Alternatively, the design can also be such that both sides cannot be locked simultaneously.

[0020] It can also be provided that the cutting body consists of a cutting edge located at the tip and two coupling surfaces. Preferably, the coupling surfaces ensure the necessary positive locking with the corresponding coupling geometry in the closing wing. Advantageously, the two coupling surfaces are arranged at an angle, in particular so that the two coupling surfaces converge in the direction of the cutting edge. In other words, this means that the cutting body essentially forms a wedge shape.

[0021] Under load, a torque acts on the locking bar. Due to the wedge-shaped design of the cutting body and the corresponding coupling geometry in the locking bar, this torque generates an axial return force on the coupling adapter, which pushes the coupling adapter out of the locking bar. The coupling adapter then rests against the cylinder housing surface with its support element. Thus, the return force does not act on the key inserted into the cylinder core. Simultaneously, this return force ensures the vehicle's functionality. The return force acting on the coupling adapter depends in particular on the angle formed by the two coupling surfaces. Preferably, the two coupling surfaces form an angle in the range of 20° to 90°, particularly from 30° to 70°, and most preferably from 55° to 65°.

[0022] Preferably, the locking cylinder is a double-profile cylinder. This preferably means that the locking cylinder has two opposing cylinder cores arranged in a common cylinder housing, with the locking bolt groove and locking bolt located between them.

[0023] It is preferred that the key be a flat key or a reversible key.

[0024] The inventive locking cylinder or lock-key system is used wherever free movement of the locking bolt under load is required. This means that a load is still acting on the locking bolt at the moment the key is withdrawn from the cylinder. This is the case with emergency exit door locks.

[0025] The invention is explained below by way of example with reference to several embodiments and the accompanying drawings. The embodiments shown are therefore not to be understood as limiting. The drawings show: Fig. 1: a schematic exploded view of a lock-key system with a lock cylinder; Fig. 2a, 2b: each a schematic representation of a coupling adapter; Fig. 3: a schematic representation of a lock cylinder housing; Fig. 4: a schematic sectional view of a lock-key system; Fig. 5: a schematic representation of a locking bolt.

[0026] InThe figures illustrate different examples of embodiments of the invention. Identical or similarly functioning components are designated with the same reference symbols. Where the embodiments shown in the figures have similarities, these similarities are not described repeatedly to avoid repetition. The respective differences between the embodiments are described in relation to the figures. It is understood that, within the scope of protection of the claims, a person skilled in the art may modify individual embodiments or combine individual features of these embodiments.

[0027] Fig. 1Figure 1 shows a schematic exploded view of a lock-key system 1 with a locking cylinder 2. The depicted locking cylinder 2 is a double-profile cylinder, i.e., it comprises two opposing cylinder cores 4 arranged in a common cylinder housing 3. The locking bolt groove 6 is located between the two cylinder cores 4 in the cylinder housing 3. The locking bolt 5 is rotatably mounted in this locking bolt groove 6. A coupling adapter 7 is arranged between the locking bolt 5 and each cylinder core 4. The coupling adapter 7 is rotationally fixed to the cylinder core 4 and can be axially displaced. Furthermore, in Fig. 1A key 18 is shown, which is already inserted into the keyway of the cylinder core 4. As the key 18 is inserted into the cylinder core 4, the coupling adapter 7 is axially displaced from the key tip towards the locking bolt 5. This displacement of the coupling adapter 7 engages the locking bolt 5. As soon as the key 18 is turned in the cylinder core 4, the locking bolt 5 also rotates, as soon as the coupling adapter 7 makes contact with the coupling geometry in the locking bolt, in order to execute the locking operation. An initial free rotation may be necessary to overcome this initial contact between the coupling adapter 7 and the coupling geometry in the locking bolt 5.In this case, the coupling adapter 7 rotates with the cylinder core 4 until the coupling adapter 7 meets the coupling geometry provided in the locking bar 5, in order to then take the locking bar 5 with it to carry out the closing process.

[0028] As soon as the locking process is initiated and a load acts on the locking bolt 5, a corresponding torque is exerted on the locking bolt 5. This torque causes the coupling adapter 7 to be axially pushed out of the locking bolt 5 due to the wedge-shaped cutting geometry of the coupling adapter 7 and the corresponding coupling geometry within the locking bolt 5. This is also referred to as the return force. To prevent the return force from acting on the inserted key 18 during the locking process, the coupling adapter 7 has a support element 8 with which the coupling adapter 7 is supported against a cylinder housing surface 17 of the locking bolt groove 6 during the execution of the locking process.

[0029] In the Figures 2a and 2b The coupling adapter 7 is shown. As in Figure 2aAs can be seen, the coupling adapter 7 has a base body 11, in particular a cylindrical base body 11, and a cutting body 12 arranged laterally to the base body 11. Furthermore, the support element 8 is arranged laterally on the cutting body 12. Figure 2a The coupling adapter 7 is shown from the side facing the locking bar 5. The cutting body 12 preferably comprises a cutting edge 13 and two coupling surfaces 14. As in Figure 2a As shown, the two coupling surfaces 14 can converge in a wedge shape. This wedge-shaped design allows the coupling adapter 7 to be axially pushed out of the recess of the locking bar 5 when the locking bar 5 is under load.

[0030] Preferably, the two coupling surfaces 14 enclose an angle in the range of 20° to 90°, in particular from 30° to 70°, and especially preferably from 55° to 65°.

[0031] In Figure 2bThe coupling adapter 7 is shown with a view of its side facing the cylinder core 4. In particular, this view allows a view of the support element 8. As in Figure 2b As shown, the support element 8 is designed in the form of a nose or a pin, which is arranged laterally on the cutting body 12. On its end face facing the cylindrical core 4, the support element 8 has the first functional area 9 and the second functional area 10.

[0032] As in Figure 2bAs can be seen, the first functional area 9 is formed on the two outer areas of the support element 8 by two doubly inclined surfaces. These surfaces are preferably inclined laterally outwards and towards the base body 11. These doubly inclined surfaces ensure that, under load, the coupling adapter 7 presses into the locking bar 5 via the leading edges 16 of the radial groove 15 in the cylinder housing 3. The first functional area 9, in particular the doubly inclined surfaces, is / are designed such that, during the closing process under load, surface contact is established between the support element 8 and the leading edges 16 of the radial groove 15 in the cylinder housing 3.

[0033] As in Figure 2bAs can be seen, the second functional area 10 is arranged in the middle of the end face of the support element 8 facing the cylinder core 4. In other words, the second functional area 10 is arranged between the two doubly inclined surfaces of the first functional area 9. The second functional area 10 is arranged according to Figure 2b also formed from two angled surfaces, each preferably forming an angle with the central plane of the coupling adapter 7 in a range of 85° to 89.8°, in particular 88° to 89.5°, preferably 89° to 89.4°. These angled surfaces compensate for play in the coupling adapter 7 within its guide in the cylinder core 4 and ensure surface contact with the cylinder housing surface 17.

[0034] In Figure 3 schematically, the cylinder housing 3 of the in Figure 1 The depicted lock cylinder 2 is shown. The cylinder housing 3 according to Figure 3The coupling adapter 7 has a locking bar groove 6 in its center. A cylindrical core 4 can be arranged in each of the two coaxially arranged bores. The cylinder housing surface 17 preferably forms the inside of the locking bar groove 6. Extending from the cylinder housing surface 17, the cylinder housing 3 has a radial groove 15 with lead-in chamfers 16. The support element 8 of the coupling adapter 7 can interact with the radial groove 15. Preferably, the radial groove 15 is at least as large in its dimensions as the support element 8. This ensures that, in the disengaged state, the support element 8 can fully engage in the radial groove 15, thus allowing the side of the cutting body 12 of the coupling adapter 7 facing away from the cutting edge 13 to be pushed out of the locking bar 5.The lead-in chamfers 16 preferably ensure that the coupling adapter 7 is pressed into the locking bar 5 via the lead-in chamfers 16 of the radial groove 15 during the closing process under load. Preferably, the lead-in chamfers 16 are configured to correspond to the surfaces of the first functional area 9 of the support element 8, so that surface contact is established between the support element 8 and the lead-in chamfer 16 when under load.

[0035] In Figure 4 Figure 1 is a schematic representation of a sectional view of a lock-key system 1, where a double profile cylinder is used as the locking cylinder. The double profile cylinder has two cylinder cores 4, one cylinder core being located to the left of the locking bolt 5 and the other cylinder core being located to the right of the locking bolt. "Left" and "right" here refer to the relative spatial relationship, as shown in the figure. Figure 4 shown to understand. As in Figure 4As can be seen, the key 18 is inserted into the keyway of the right cylinder core 4. The coupling adapter 7 is arranged on the end face of the cylinder core 4 in a rotationally fixed but axially displaceable manner. Furthermore, the locking bolt 5 is arranged in the locking bolt groove 6 of the cylinder housing 3.

[0036] In Fig. 5 A locking bar 5 is shown schematically. As in Fig. 5 As can be seen, the locking bolt has a recess 5b. Preferably, the locking bolt 5 has a recess 5b on both sides. The coupling adapter 7 can be pressed into this recess 5b by inserting the key. Furthermore, the locking bolt 5 has, according to Fig. 5A corresponding coupling geometry 5a protrudes from the recess 5b. Preferably, the corresponding coupling geometry 5a substantially corresponds to the outer contour of the cutting body 12 and interacts with the cutting body 12 of the coupling adapter 7. In an alternative embodiment, the locking bar 5 may have two or more corresponding coupling geometries 5a. Depending on the number of coupling geometries 5a in the locking bar 5, a possible free rotation angle results. That is, when the key is inserted and the coupling adapter 7 is thereby pressed into the locking bar 5, the cutting body 12 of the coupling adapter 7 only contacts the corresponding coupling geometry 5a in the locking bar 5 after a certain free rotation and consequently transmits a torque. Reference symbol list

[0037] 1 Lock-key system 2 Lock cylinder 3 Cylinder housing 4 Cylinder core 5 Locking bolt 5a Corresponding coupling geometry 5b Countersink 6 Locking bolt groove 7 Coupling adapter 8 Support element 9 First functional area 10 Second functional area 11 Base body 12 Cutting body 13 Cutting edge 14 Coupling surface 15 Radial groove 16 Lead-in chamfer 17 Cylinder housing surface 18 Key

Claims

1. A locking cylinder (2), in particular a double-profile cylinder, comprising a cylinder housing (3) in which at least one cylinder core (4) is rotatably mounted, a locking bit (5) which is rotatably mounted within a locking bit groove (6) arranged on the cylinder housing (3), and a coupling adapter (7) arranged between the at least one cylinder core (4) and the locking bit (5), which coupling adapter is mounted non-rotatably and axially displaceable in the cylinder core (4), wherein the locking bit (5) is couplable to a key (18) which is insertable into a key channel of the at least one cylinder core (4) to perform a joint locking operation that triggers the locking function, by bringing the coupling adapter (7) into positive engagement with the locking bit (5) through an axial displacement of the coupling adapter (7) caused by the tip of the inserted key (18), characterized in that the coupling adapter (7) comprises a support element (8) by means of which the coupling adapter (7) rests against a cylinder housing surface (17) of the locking bit groove (6) during the locking operation.

2. Locking cylinder (2) according to claim 1, characterized in that the cylinder housing (3) has a radial groove (15) extending from the locking bit groove (6).

3. Locking cylinder (2) according to claim 2, characterized in that the support element (8) of the coupling adapter (7) engages with the radial groove (15) when the key (18) is removed.

4. Locking cylinder (2) according to one of the preceding claims, characterized in that the coupling adapter (7) comprises a base body (11), in particular a cylindrical base body (11), and a cutting body (12) arranged laterally on the base body (11), wherein the support element (8) is arranged laterally on the cutting body (12).

5. Locking cylinder (2) according to one of the preceding claims, characterized in that the support element (8) is shaped like a tab or a pin.

6. Locking cylinder (2) according to one of the preceding claims, characterized in that the support element (8) has, on a side facing the cylinder core (4), a first functional area (9) and a second functional area (10).

7. Locking cylinder (2) according to claim 6, characterized in that the first functional area (9) is arranged at the two outer regions of the support element (8), wherein the first functional area (9) is formed by two double-sloped surfaces, in particular wherein the two double-sloped surfaces are arranged mirror-symmetrically with respect to the center plane of the coupling adapter (7).

8. Locking cylinder (2) according to claim 6 or 7, characterized in that the second functional area (10) is arranged in a central region of the support element (8), wherein the second functional area (10) is formed by two angled surfaces extending from the center plane.

9. Locking cylinder (2) according to claim 8, characterized in that the two surfaces of the second functional area (10) each form an angle with the center plane of the coupling adapter (7) within a range of 85° to 89.8°, in particular 88° to 89.5°, preferably 89° to 89.4°.

10. Locking cylinder (2) according to one of claims 4 to 9, characterized in that the cutting body (12) interacts with at least one corresponding coupling geometry provided in the locking bit (5).

11. Locking cylinder (2) according to one of claims 4 to 10, characterized in that the cutting body (12) consists of a cutting edge (13) located at the tip and two coupling surfaces (14).

12. Locking cylinder (2) according to one of claims 2 to 11, characterized in that the radial groove (15) has inlet bevels (16).

13. Lock-key-system (1) comprising a key (18) and a locking cylinder (2), in particular a double-profile cylinder, according to one of the preceding claims, wherein the locking cylinder (2) comprises a cylinder housing (3) in which at least one cylinder core (4) is rotatably mounted, a locking bit (5) which is rotatably mounted within a locking bit groove (6) arranged on the cylinder housing (3), and a coupling adapter (7) arranged between the at least one cylinder core (4) and the locking bit (5), which coupling adapter is mounted non-rotatably and axially displaceable in the cylinder core (4), wherein the locking bit (5) is couplable to the key (18) which is insertable into a key channel of the at least one cylinder core (4) to perform a joint locking operation that triggers the locking function, by bringing the coupling adapter (7) into positive engagement with the locking bit (5) through an axial displacement of the coupling adapter (7) caused by the tip of the inserted key (18), characterized in that the coupling adapter (7) comprises a support element (8) by means of which the coupling adapter (7) rests against a cylinder housing surface (17) of the locking bit groove (6) during the locking operation.

14. Lock-key-system (1) according to claim 13, characterized in that the key (18) is a flat key or a reversible key.

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