Combined structure of disc-shaped marble cylindrical lock and key

Abstract

The invention relates to a combination of a disc pin cylinder lock (3) and a key (2), the disc pin cylinder lock (3) comprising a rotation limiting device (10) for the key. The rotation limiting device comprises a main body (13) having a key profile opening (34), and a guide element (12) connected to the main body. The key (2) comprises guide grooves (21) located on both sides of the key in the longitudinal direction of the key shank (2A), and a transverse groove (19) transverse to the longitudinal axis of the shank (2A) of the key (2). The rotation limiting device (10) comprises one or two plates (14).

Description

Technical Field

[0001] This invention relates to a combination structure of a disc tumbler cylinder lock and a key. Specifically, this invention relates to a combination structure in which the disc tumbler cylinder lock is provided with a rotation limiter. Background Technology

[0002] In a disc tumbler lock, tumblers are used to decode a specific key's combination and open the lock. Inserting the key into the disc tumbler lock does not unlock the combination; only turning the key will cause the tumblers to rotate according to the key's cut (also known as a combination cut), thus unlocking the key's combination. Once the key's combination is unlocked, continuing to turn the key will open the disc tumbler lock. Specifically, continuing to turn the key after the key's combination is unlocked will cause the tail end of the disc tumbler lock to rotate. This tail end can be connected to the locking bar or linked to the locking bar through a locking mechanism.

[0003] A rotation limiter is a mechanical device that prevents an incorrect key inserted into a disc pin cylinder lock from turning within the lock, thus preventing the disc pins from rotating out of their basic position. The rotation limiter also prevents a key matched to the lock from turning before it is fully inserted into the cylinder. In this situation, turning the key could still cause the pins to rotate out of their common basic position, even without unlocking. The basic position refers to the state where the key can be inserted into (and removed from) the cylinder lock. In this basic position, the cylinder lock is locked.

[0004] A rotation limiter allows the key to rotate within a cylindrical lock, provided the correct key is fully inserted. For example, patent publication FI 81429 discloses a known rotation limiter for a disc pin tumbler cylindrical lock. This rotation limiter includes a body and a housing ring. The housing ring is connected to the inner cylinder of the disc pin tumbler cylindrical lock. The body has a key profile opening in its center through which the key can be inserted into the cylindrical lock. Plates are provided on each side of the key profile opening.

[0005] The key that matches the disc pin tumbler lock has a groove for a limiting plate. When the correct key is in the lock cylinder, this groove aligns with the limiting plate, allowing the key to rotate and move the pin tumbler to the correct position for unlocking. Therefore, the inner cylinder can rotate with the continued rotation of the key. This rotation limiter improves the operational reliability of the disc pin tumbler lock.

[0006] The lock may also include a guide element positioned within the keyway formed by the key opening on the disc, as described in FI 81429. The guide element comprises two guide rails and a yoke located between them. The yoke is located at the inner end of the disc pin tumbler lock, thus securely connecting the guide rails to each other. In other words, the guide element can be a guide rail bent 180 degrees in the middle. Conventionally, the guide element is on a rotation limiting device so that as the key rotates within the lock, the guide element also rotates continuously. The guide element controls the insertion and removal of the key from the lock and also serves as a manipulator-proof enclosure. Furthermore, it itself contributes to the contour of the key that matches the lock.

[0007] While previously known disc pin tumbler lock solutions provided good protection against manipulation, improvements in reliability and protection were still desired. Summary of the Invention

[0008] The purpose of this invention is to provide an alternative solution and further improve the operational reliability and security of the disc pin tumbler lock and key combination structure. This objective is achieved through the technical solution described in the independent claims. Various embodiments of the invention are detailed in the dependent claims.

[0009] This invention relates to a combination structure of a disc-shaped pin tumbler cylindrical lock 3, 3A and keys 2, 2B, wherein the disc-shaped pin tumbler cylindrical lock 3, 3A includes rotation limiting devices 10, 10A for the keys. The rotation limiting device includes: a main body 13, 131 with key outline openings 34, 341; and guide elements 12, 12A connected to the main body. The keys 2, 2A have guide grooves 21, 211 on both sides of the key shank 2A, 2A1 in the longitudinal direction, and transverse grooves 19, 191 transverse to the longitudinal axis of the key shank 2A, 2A1 relative to the longitudinal axis of the key shank 2, 2B. The rotation limiting devices 10, 10A include plates 14, 14A movably connected to the main body. The plates include protrusions 31, 133 facing each other, which are located within the guide grooves 21, 211 when the keys 2, 2B are inserted into the cylindrical lock. The plate also has limiting surfaces 40 and 32A, while the disc pin cylinder lock includes table surfaces 41 and 25A.

[0010] Rotation limiting devices 10 and 10A are arranged in the locked position, with limiting surfaces 40 and 32A abutting against table surfaces 41 and 25A. The rotation limiting devices are arranged to rotate when keys 2 and 2B are inserted into the cylindrical lock and turned. Therefore, when the transverse grooves 19 and 191 are aligned with the protrusions 31 and 133, allowing plates 14 and 14A to move along the transverse grooves 19 and 191, turning the key causes the limiting surfaces 40 and 32A to move away from the table surfaces 41 and 25A. Attached Figure Description

[0011] The present invention will now be described in detail with reference to the accompanying drawings, wherein: Figure 1 An example of the disc-shaped pin tumbler cylinder lock and key of the present invention is shown; Figure 2 An example of the key of the present invention is shown; Figure 3 An example of the casing is shown; Figure 4 An example of a board is shown; Figure 5 It shows Figure 4 The other side of the plate shown; Figure 6 An example of the subject is shown; Figure 7 The state of the rotation limiting device plate in the locked position is shown from the key opening side; Figure 8 The position of the tongue when the plate is in the locked position is shown from the guide element side; Figure 9 The state of the rotation limiting device plate after it has rotated from the locked position is shown from the key opening side; Figure 10 The position of the tongue after the plate rotates from the locking position is shown from the guide element side; Figure 11 The state of the rotation limiting device plate after rotating 90 degrees from the locked position is shown from the key opening side; Figure 12 The position of the tongue after the plate has rotated 90 degrees from the locking position is shown from the guide element side; Figure 13 A cross-sectional example of a key is shown; Figure 14 Another example of the disc pin tumbler cylinder lock and key of the present invention is shown; Figure 15 Another example of the key of the present invention is shown; Figure 16 Shown from the key opening side Figure 14 The state of the plate of the rotation limiting device shown in the locked position; Figure 17 Shown from the key opening side Figure 14 The state of the plate of the rotation limiting device after it has rotated from the locked position; and Figure 18 Shown from the key opening side Figure 14 The state of the plate of the rotation limiting device shown after rotating 90 degrees from the locked position. Detailed Implementation

[0012] Figure 1 and Figure 14 Different embodiments of the present invention are shown. As previously described, the present invention relates to a combination structure of a disc pin tumbler cylinder lock 3, 3A and keys 2, 2B, wherein the disc pin tumbler cylinder lock 3, 3A includes rotation limiting devices 10, 10A for the keys. The rotation limiting device includes a body 13, 131 having key outline openings 34, 341, and guide elements 12, 12A connected to the body. The keys 2, 2A include guide grooves 21, 211 on both sides of the key shank 2A, 2A1 in the longitudinal direction, and transverse grooves 19, 191 provided transversely to the longitudinal axis of the key shank 2A, 2A1. The rotation limiting devices 10, 10A include plates 14, 14A movably connected to the body. The plates include protrusions 31, 133 facing each other, which are located within the guide grooves 21, 211 when the keys 2, 2B are inserted into the cylinder lock. The plate also has limiting surfaces 40 and 32A, while the disc pin cylinder lock includes table surfaces 41 and 25A.

[0013] Rotation limiting devices 10 and 10A are arranged in a locked position, with limiting surfaces 40 and 32A abutting against tabletop surfaces 41 and 25A. The rotation limiting devices are arranged to rotate when keys 2 and 2B are inserted into the cylindrical lock and turned, and when the transverse grooves 19 and 191 align with the protrusions 31 and 133, allowing plates 14 and 14A to move along the transverse grooves 19 and 191, turning the key causes the limiting surfaces 40 and 32A to move away from the tabletop surfaces 41 and 25A. The locked position is the aforementioned basic position.

[0014] Figure 2 and Figure 15 Different embodiments of the key according to the present invention are shown. For example... Figure 2 As shown, the transverse groove 19 has a bottom 19A, which is at the same level as the highest section 21A of the bottom of the guide groove 21. Figure 15 As shown, the transverse groove 191 can have a concave bottom. It is understood that keys of different shapes can be manufactured according to the present invention; for example, grooves 19 and 191 can have different shapes. Although Figure 2 The example key shown is for use in conjunction with Figure 1 A cylindrical lock, but it is also possible to design a similar one. Figure 1 Another embodiment of the lock, adapted to Figure 15 The key shown. Similarly, Figure 14 The illustrated embodiments can also be designed to be adapted. Figure 15 A variation of the key. It should be noted that... Figure 15 The diagram shows a key blank, on which a cutout for a composite structure can be machined. This will be understood by those skilled in the art, and therefore it is clear that... Figure 15It at least implicitly suggests a complete key.

[0015] therefore, Figure 1 An example of the combination structure of the disc pin tumbler lock and key of the present invention is shown. The present invention relates to a combination structure 1 of a disc pin tumbler lock 3 and a key 2, wherein the disc pin tumbler lock 3 includes a rotation limiting device 10 for the key. The rotation limiting device includes a body 13 having a key outline opening 34, a guide element 12 connected to the body, and a housing 11 at least partially surrounding the body.

[0016] like Figure 1 As shown, the cylindrical lock also includes an outer core 4 with a key opening 18 and an inner cylinder 5. The inner cylinder 5 contains disc pins 6 and intermediate discs 7. The intermediate discs 7 are fixed to the inner cylinder in a non-rotatable manner, so that rotation of a single disc pin 6 will not be transmitted to adjacent disc pins.

[0017] The inner cylinder may also include a support plate 16. As previously described, the cylindrical lock is locked in the basic position. Key 2 is inserted into the cylindrical lock 3 through key opening 18. If key 2 matches the cylindrical lock 3, rotation limiting device 10 will allow the key to rotate. When the key is turned, the key combination structure cutout 20 drives the disc pin 6 to rotate. After rotating 90 degrees, the disc pin 6 reaches a position where its outer slots are aligned with each other and aligned with the locking bar 8. In the basic position, the locking bar prevents the inner cylinder 5 from rotating relative to the outer core 4. When the disc pin 6 is aligned with the locking bar in the above manner and the key 2 continues to rotate, the locking bar 8 will move into the tongue groove 17 of the inner cylinder and into the outer slot of the aligned disc pin. Thus, the inner cylinder 5 can rotate relative to the outer core 4, and the lock is unlocked / opened. When the key 2 inside the cylindrical lock is rotated in the reverse direction to the basic position, the lock is locked. Reset rod 9 assists the pin disc to rotate back to the basic position.

[0018] Figure 2 An example of a key 2 according to the present invention is shown. The key 2 is provided with guide grooves 21 on both sides in the longitudinal direction of its key shank 2A. These guide grooves 21 are for engaging with guide elements 12, and their contours match the shape of the guide rails of guide elements 12. The key is also provided with transverse grooves 19 transverse to the longitudinal axis of the key shank 2A.

[0019] The rotation limiting device 10 also includes one or two U-shaped plates 14, each comprising two sides 29 and a connecting portion 33 connecting the two sides. The connecting portion is provided with a tab 32, and the two sides 29 are provided with protrusions 31 facing each other. When the key 2 is inserted into the cylindrical lock, the protrusions 31 are arranged to fit into the guide grooves 21. Figure 4 and Figure 5 Plate 14 is shown.Figure 13 A cross-sectional view of the key 2 at the transverse groove 19 is shown. Therefore, when the key is inserted into the cylindrical lock 3, the protrusion of the plate is located within the guide groove, and the key is pushed into the lock. When the key 2 is pushed to the bottom, the transverse groove 19 aligns with the protrusion 31. In other words, the portion of the key shaft 2A with the transverse groove 19 is at the same level as the plate 14 and its protrusion 31.

[0020] Figure 6 The main body 13 of the rotation limiting device 10 is shown. The main body 13 includes one or two slots 35 located on its outer edge 13A, and a guide protrusion 37 is provided on one side of the main body. A plate 14 is located between these guide protrusions 37, while a tongue 32 passes through the slot 35, which allows for... Figure 1 and Figure 7 to Figure 12 As observed, the main body is plate-shaped. The guide element 12 is located on the opposite side of the main body relative to the guide protrusion 37. Furthermore, from... Figure 1 As can be seen, the rotation limiting device 10 may also include a drilling cover 15 located on the other side of the plate 14 opposite to the guide element 12.

[0021] Figure 3 An embodiment of the housing 11 is shown. The housing 11 includes a central hole 22 and a circular groove 24 surrounding the central hole. The circular groove has one or two sectors 27 that are closer to the central hole 22 than the rest of the circular groove. At such sectors 27, the outer edge of the circular groove has a protrusion 25 facing the central hole 22, while the inner edge of the circular groove 24 has a cavity 26. The outer edge of the housing 11 is wider than the corresponding middle portion with the circular groove 24. A cutout 23 may be provided on the outer edge to provide rotation space for a drilled cap 15 with peripheral protrusions. The housing 11 is non-rotatably connected to the inner cylinder 5 by its specific shape 11A.

[0022] The rotation limiting device 10 is arranged in its locked position, wherein the tongue 32 is located within the sector 27, abutting against the protrusion 25 and the cavity 26. The rotation limiting device is arranged to rotate when the key 2 is inserted into the cylindrical lock and rotated, and when the transverse groove 19 is aligned with the protrusion 31 to allow the plate 14 to move along the transverse groove 19, turning the key causes the tongue to move away from the sector 27 of the circular groove 24.

[0023] Figure 7 to Figure 12 The diagram illustrates the operation of the rotation limiting device 10 when the cylindrical lock 3 is opened from its locked position (basic position). These illustrations do not show the key inserted into the cylindrical lock, but it is assumed that the key 2 is fully inserted into the cylindrical lock.

[0024] Figure 7The state of the plate 14 of the rotation limiting device in the locked position is shown from the key opening side 18. Figure 8 The position of the tongue 32 when the plate is in the locked position is shown from the guide element 12 side. This is because the protrusion 31 of the plate is located within the guide groove 21 (see also...). Figure 13 The key has been inserted into the cylindrical lock 3. The tongue 32 is located within the sector 27 and abuts against the protrusion 25 and the cavity 26, thereby holding the plate 14 in its basic position. In this basic position, the plate cannot move freely. The plate 14 is located between the guide protrusions 37, or more precisely, between the guide surfaces 38 of the guide protrusions 37. The guide protrusions 37 may also be provided with additional protrusions 39 for securing the body 13 to the drilled cap 15.

[0025] The connecting portion 33 of the plate has an inner side 33A that forms the bottom of the slot 30 located between the sides 29. The inner side 33A can be arranged at the same level as or sufficiently close to the same level as the edge 34A of the key outline opening 34 (see also). Figure 4 to Figure 6 Therefore, the plate is made as close as possible to the shape of the key outline opening 34. When the plate is also unable to move freely in its basic position, the plate improves the operational reliability of the disc pin tumbler lock and key combination structure and enhances the security against unauthorized opening of the disc pin tumbler lock.

[0026] To open the cylindrical lock 3, the correct key 2 must be fully inserted into the lock. At this point, the transverse groove 19 aligns with the protrusion 31 of the plate 14, allowing the key to turn. When the key 2 is turned, the transverse groove allows the protrusion 31 to move along it, meaning the plate will move as the key turns. If the key is incorrect, for example, if there is a guide groove 21 but no transverse groove, the sidewall 21C of the guide groove 21 will obstruct the movement of the plate 14.

[0027] Figure 9 The state of the plate 14 of the rotation limiting device after being rotated from the locked position by the correct key 2 is shown from the key opening 18 side. Figure 10 The position of the tab 32 after the plate rotates from the locked position is shown from the guide element side. As shown, the plate 19 has moved along the transverse groove 19 toward the outer edge of the housing 11. The tab 32 has moved away from the dead point (center point) at the end of sector 27. As the key continues to turn, the tab will disengage from sector 27 and enter the outer area of ​​the circular groove 24. Figure 12 The position of the tab on plate 14 is shown from the guide element side after the key 2 (as well as the body 13 and plate) is rotated 90 degrees from the locked position. Figure 8 , Figure 10 and Figure 12 The yoke portion of the guide element 12 is shown in both cases. Figure 11 The state of the rotation limiting device plate 14, rotated 90 degrees from the locked position, is shown from the key opening side. Figure 11 andFigure 12 At the indicated location, the key combination has been deactivated. Continue turning the key to unlock / open the disc pin tumbler lock.

[0028] Furthermore, as can be seen from the figure, the side 29A of the side portion 29 is arranged to abut against the guide protrusion 37, while the protrusion 31 is located at the inner corner 29B of the side portion 29.

[0029] exist Figure 13 As can be seen, the transverse groove 19 has a bottom 19A, which can be at the same level as the highest section 21A of the bottom of the guide groove 21, such as... Figure 13 As shown. Although the transverse groove 19 can be deeper, this type of groove embodiment has certain advantages: the middle of the key shaft can maintain higher strength because this transverse groove is a two-part groove and does not involve additional transverse cuts at the bottom of the longitudinal guide groove 21. Furthermore, this type of transverse groove 19 located on the side of the key shaft can be positioned at the location of the assembly structure cutout 20 without affecting the function of the assembly structure cutout. With this design, the same key 2 can be used both as described above and in… Figure 1 The disc pin tumbler lock shown can also be used with other disc pin tumbler locks equipped with one or more additional disc pins 6. That is, the length can be greater than Figure 1 Other cylindrical locks in the embodiments.

[0030] The bottom of the guide groove 21 can be used to form a key profile that matches the shape of the guide rail corresponding to the guide element 12. Figure 13 This is just one possible example. For instance, the bottom could be flat, in which case the entire bottom would form the highest section 21A of the bottom of the guide groove. Alternatively, as... Figure 13 As shown, there is more than one highest section 21A at the bottom. Therefore, the bottom may have one or more contoured grooves 21B.

[0031] In embodiments according to the invention, one or two plates 14 may be used. In any case, the dual-plate embodiment offers higher reliability and safety because the force distribution within the rotation limiting device 10 (i.e., the rotation limiter) is more uniform. Furthermore, the central portion of the protrusion 25 includes a small recess 28, while the central portion of the cavity 26 includes a small protrusion 28A. These small recesses and protrusions help to hold the tongue 32 in its basic position.

[0032] Figure 14 and Figure 15 Another embodiment of the invention is shown. This embodiment also includes a combination structure of a disc pin tumbler lock 3A and a key 2B. Figure 14 The outer core 4 is not shown, but it should be noted that this cylindrical lock includes this outer core, and its corresponding structure can be found by referring to [reference needed]. Figure 1As shown. The inner cylinder 60 includes a disc-shaped pin 6A and a spacer 7A. The spacer 7A is fixed to the inner cylinder in a non-rotatable manner, so that the rotation of a single disc-shaped pin 6 will not be transmitted to adjacent disc-shaped pins. Figure 14 Locking lever 61 is also shown. The working principle of this locking lever and the disc pin has been explained above.

[0033] The disc pin tumbler lock 3A includes a rotation limiting device 10A for the key. This rotation limiting device has a body 131, which is a circular plate including a key opening 341. A guide element 12A consists of two rods with narrow ends 12B, and the circular plate body also includes two holes 132 connected to the narrow ends 12B. A plate 14A includes a central hole 42 for the key 2B and two second holes 43. The narrow ends 12B pass through the second holes. The central hole and the second holes are arranged to allow the plate 14A to move along a transverse groove 191 when the key 2B is turned. It is noteworthy that, in this embodiment, the guide element 12A can be considered as part of the rotation limiting device 10A, as it is connected to the body and provides guidance for the plate 14A.

[0034] Plate 14A includes the limiting surface 40 and may have a return surface 44. The inner cylinder 60 of the disc pin tumbler lock includes a platform surface 41 and may have a platform return surface 45. The return surface and the platform return surface are arranged to guide plate 14A back to the locked position when the key is turned in the reverse direction. The platform return surface 45 and the platform surface 41 form the end of the cut sector 46 of the inner cylinder of the disc pin tumbler lock.

[0035] Figure 16 The state of the rotation limiting device plate 14A in the locked position is shown from the key opening side. This is because the protrusion 133 of the plate is located within the guide groove 211 (see also...). Figure 15 The key is inserted into the cylindrical lock 3. The end 12B and the abutment structure between the plate edge and the inner cylinder 60 together hold the plate in its basic position. In this basic position, the plate cannot move freely. To open the cylindrical lock 3A, the correct key 2B must be fully inserted into the cylindrical lock. At this time, the transverse groove 191 aligns with the protrusion 133 of the plate 14A, and the key can be turned. When the key 2A is turned, the transverse groove allows the protrusion 133 to move along the transverse groove, which means that the plate will move as the key is turned. If the key is incorrect, for example, if there is a guide groove 211 but no transverse groove, the sidewall of the guide groove will obstruct the movement of the plate 14A.

[0036] Figure 17 The state of plate 14A after being rotated from the locked position by the correct key 2B is shown from the key opening side. As shown, the plate has moved along the transverse groove. The central hole 42 and two holes 43 for the guide element end 12B provide space for the movement of plate 14A. When the key continues to rotate, it can reach... Figure 18 The location shown.Figure 18 The diagram shows the state of key 2B (and body 131) after it has been rotated 90 degrees from the locked position. In this position, the rotation limiting device has been rotated 90 degrees from the locked position, and the key combination has been released; when the key is turned further, the disc pin tumbler lock is unlocked / opened.

[0037] like Figure 16 to Figure 18 As shown, plate 14A may be provided with a stop 47, which is arranged to abut against the limiting surface 40 when plate 14A is in a 90-degree rotation position. The plate may also include an inclined surface 48, which connects to the return surface 44 at its deeper end 48A. Between the stop 47 and the return surface 44, plate 14A may have a raised sector 49. Furthermore, plate 14A also has an indentation 411 for a locking lever.

[0038] The inner cylinder 60 may include a zero-position pin 50 having a central hole 51 and two second holes 52. The zero-position pin is a pin tray that rotates with the key. The narrow end 12B of the lever 12A passes through the two second holes 52, and the zero-position pin 50 abuts against the plate 14A. This type of zero-position pin tray provides additional support for the plate 14A. Both the body plate 131 and the zero-position pin 50 may have contoured protrusions 53 facing each other. These contoured protrusions mate with guide grooves 211.

[0039] This invention improves the operational reliability and security of the disc pin tumbler lock and key combination structure. Because plate 14 cannot move freely in its basic position, the lock's functional reliability is higher, and it is more difficult to manipulate.

[0040] Obviously, the present invention is not limited to the examples listed in this specification, and can be implemented in a variety of different embodiments within the scope of the independent claims.

Claims

1. A combination structure of a disc-shaped pin tumbler lock (3, 3A) and a key (2, 2B), wherein, The disc-shaped pin tumbler cylinder lock (3, 3A) includes a rotation limiting device (10, 10A) for the key, the rotation limiting device including a body (13, 131) having a key outline opening (34, 341) and a guide element (12, 12A) connected to the body. The key (2, 2A) includes guide grooves (21, 211) located on both sides of the key in the longitudinal direction of the key shank (2A, 2A1), and the shank (2A, 2A1) relative to the key (2, 2B). The transverse groove (19, 191) is transverse to the longitudinal axis of the cylinder lock, characterized in that the rotation limiting device (10, 10A) includes a plate (14, 14A) movably connected to the main body, the plate including protrusions (31, 133) facing each other, the protrusions (31, 133) being located within the guide groove (21, 211) when the key (2, 2B) is inserted into the cylinder lock, the plate also having a limiting surface (40, 32A), and the disc pin cylinder lock including a table surface (41, 25A). The rotation limiting device (10, 10A) is arranged in the locked position of the rotation limiting device, wherein the limiting surface (40, 32A) abuts against the table surface (41, 25A), and the rotation limiting device is arranged to rotate when the key (2, 2B) is inserted into the cylindrical lock and rotated, and when the transverse groove (19, 191) is aligned with the protrusion (31, 133) to allow the plate (14, 14A) to move along the transverse groove (19, 191), the key is turned to remove the limiting surface (40, 32A) from the table surface (41, 25A).

2. The combined structure according to claim 1, characterized in that, The transverse groove (19) has a bottom (19A) that is at the same level as the highest section (21A) of the bottom of the guide groove (21).

3. The combined structure according to claim 1, characterized in that, The transverse groove (191) has a concave bottom.

4. The combined structure according to claim 1, 2, or 3, characterized in that, The combined structure includes a housing (11) that at least partially surrounds the body, and the rotation limiting device (10) includes one or two U-shaped plates (14), each plate including two sides (29) and a connecting portion (33) connecting the sides, the connecting portion having a tongue (32), the sides (29) having protrusions (31) facing each other, and the tongue (32) having a limiting surface (32A). The body (13) includes one or two slots (35) located on the outer edge (13A) of the body, a guide protrusion (37) is provided on one side of the body, the plate (14) is located between the guide protrusions (37), and the tongue (32) passes through the slot (35). The outer casing (11) includes a central hole (22) and a circular groove (24) surrounding the central hole, the circular groove having one or two sectors (27) closer to the central hole (22) than the rest of the circular groove, the outer edge of the circular groove having a protrusion (25) facing the central hole (22) at the sector (27), the inner edge of the circular groove (24) having a cavity (26), and the protrusion (25) having a mesa surface (25A). The rotation limiting device (10) is arranged in the locked position of the rotation limiting device, wherein the tongue (32) is located in the sector (27) abutting against the protrusion (25) and the cavity (26), the rotation limiting device is arranged to rotate when the key (2) is inserted into the cylindrical lock and rotated, and when the transverse groove (19) is aligned with the protrusion (31) to allow the plate (14) to move along the transverse groove (19), the key is rotated to remove the tongue from the sector (27) in the circular groove (24).

5. The combined structure according to claim 4, characterized in that, The connecting portion (33) of the plate has an inner side (33A) that forms the bottom of a slot (30) between the two sides (29), and the inner side (33A) is arranged at the same level or sufficiently close to the same level as the edge (34A) of the key outline opening (34).

6. The combined structure according to claim 4 or 5, characterized in that, The side (29A) of the side portion (29) is arranged to abut against the guide protrusion (37), and the protrusion (31) is located at the inner corner (29B) of the side portion (29).

7. The combined structure according to any one of claims 4-6, characterized in that, The transverse groove (19) on the side of the key bar is provided at the cutout (20) of the combined structure.

8. The combined structure according to any one of claims 4-7, characterized in that, The protrusion (25) includes a small recess (28) located in the middle of the protrusion, and the cavity (26) includes a small protrusion (28A) located in the middle of the cavity.

9. The combined structure according to any one of claims 4-8, characterized in that, The rotation limiting device (10) includes a drilled cap (15) located on the opposite side of the plate (14) opposite to the guide element (12).

10. The combined structure according to any one of claims 4-9, characterized in that, The outer shell (11) is connected to the inner cylinder (5) of the disc pin tumbler lock in a non-rotatable manner.

11. The combined structure according to claim 1, 2 or 3, characterized in that, The body (131) is a circular plate including a key opening (341), the guide element has two rods (12A) with narrow ends (12B), the circular plate also includes two holes (132) connected to the narrow ends (12B), the plate (14A) includes a central hole (42) for the key (2B) and two second holes (43), the narrow ends (12B) pass through the second holes, the central hole and the second holes are arranged to allow the plate (14A) to move along the transverse groove (191) when the key (2B) is turned.

12. The combined structure according to claim 11, characterized in that, The plate (14A) includes a return surface (44), and the inner cylinder (60) of the disc pin tumbler lock includes the table surface (41) and the table return surface (45), the return surface and the table return surface being arranged to guide the plate back to the locked position when the key is turned in the opposite direction, the table return surface (45) and the table surface (41) serving as the ends of the cutting sector (46) of the inner cylinder of the disc pin tumbler lock.

13. The combined structure according to claim 12, characterized in that, The plate (14A) has a stop (47) arranged to abut against the limiting surface (40) when the plate (14A) is in a 90-degree rotation position. The plate also includes an inclined surface (48) connected to the return surface (44) at a deeper end of the inclined surface.

14. The combined structure according to claim 13, characterized in that, The plate (14A) has a raised sector (49) located between the stop (47) and the return surface (44).

15. The combined structure according to claim 12, 13 or 14, characterized in that, The plate (14A) has a notch for the locking bar.

16. The combined structure according to claim 15, characterized in that, The combined structure includes a zero-position ball (50) having a central hole (51) and two second holes (52), the narrow end (12B) of the rod (12A) passing through the two second holes (52), and the zero-position ball (50) abutting against the plate (14A).

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