Blade number changing lock, lock system and number changing method

Abstract

The application discloses a blade type number changing lock, a lock system and a number changing method. The blade type number changing lock comprises a lock body, a lock cylinder rotatably installed in the lock body, a clutch block axially movably installed on the lock cylinder and rotatable with the lock cylinder, and a lock tail rotatably installed at the tail end of the lock body and provided with a driving part for driving the clutch block to axially move. The lock tail is provided with a number changing block having an unlocking position and a number changing position. When the number changing block is in the unlocking position, the number changing block is in transmission connection with the lock cylinder and the lock tail, and the clutch block is axially limited between the lock cylinder and the lock tail. When the number changing block is in the number changing position, the number changing block is in transmission connection with the lock body and the lock tail, and the clutch block can axially move under the driving of the driving part, so that the meshing structure is separated. The application completely eliminates the security hidden trouble problem caused by unauthorized number changing.

Description

Technical Field

[0001] This invention relates to the field of lock technology, specifically to a blade-type lock with interchangeable numbers, a lock system, and a number-interchange method. Background Technology

[0002] Leaf locks are widely used in the security field due to their complex structure, low rate of cross-opening, and strong resistance to technical opening. In practical applications, there is often a need to change keys, for example, when a tenant moves out and the key combination of the lock cylinder needs to be changed to ensure the security of subsequent tenants.

[0003] In the prior art, Chinese invention patent with publication number CN109989622A discloses a blade lock cylinder and its key changing method. This solution sets an adjusting screw that is threadedly connected to the clutch block at the front end of the lock cylinder. When the key needs to be changed, the adjusting screw is rotated using a screwdriver or other tools to drive the clutch block to move axially, so that the clutch teeth on the clutch blade disengage from the clutch tooth groove on the drive block, thereby realizing the replacement of the key combination.

[0004] However, this key-changing method presents a significant security risk: since the operation only requires pushing a clutch with a tool, anyone holding the currently valid key can unlock the door normally and then use a tool to push the clutch to change the key combination, replacing the lock cylinder with another key. This renders the key held by the original authorized user (such as the landlord) invalid without their knowledge, preventing them from opening the lock and compromising the security and reliability of the lock.

[0005] In addition, the above-mentioned method of changing the clutch number requires additional tools to achieve axial movement of the clutch, which is cumbersome and difficult, especially for non-professionals, resulting in a poor user experience. Summary of the Invention

[0006] The purpose of this invention is to provide a blade-type number-changing lock, a lock system, and a number-changing method to solve the security risks caused by unauthorized number changing in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a leaf-type number-changing lock, comprising:

[0009] The lock body has a hollow cavity;

[0010] The lock cylinder is rotatably installed in the hollow cavity of the lock body;

[0011] The clutch block is axially movable and can rotate with the lock cylinder. A separable engagement structure is provided between the lock cylinder and the clutch block.

[0012] A lock tail is rotatably mounted on the tail end of the lock body, and the lock tail is provided with a drive part for driving the clutch block to move axially;

[0013] A number-changing block is axially movable and installed on the lock tail. The number-changing block has an unlocking position and a number-changing position.

[0014] When the number-changing block is in the unlocked position, the number-changing block drives the lock cylinder and the lock tail, so that the lock cylinder, the clutch block and the lock tail can rotate as a whole, and the clutch block is axially limited between the lock cylinder and the lock tail.

[0015] When the number-changing block is in the number-changing position, the number-changing block drives the lock body and the lock tail. The lock cylinder and the clutch block can rotate relative to the lock tail, and the clutch block can move axially under the drive of the drive unit to disengage the engagement structure.

[0016] Optionally, the driving part is a number changing slot opened on the lock tail; the lock body is provided with a driving block, and when the clutch block rotates relative to the lock tail, the driving block can push the clutch block and move it axially into the number changing slot.

[0017] Optionally, the tail end of the lock body is provided with a limiting boss, and the lock tail is provided with a limiting groove that cooperates with the limiting boss; the limiting boss abuts against one end of the limiting groove when the lock cylinder is in the initial angle, and abuts against the other end of the limiting groove when the lock cylinder is in the unlocking angle.

[0018] Optionally, a limiting blade may be movably installed on the lock cylinder, and a limiting notch that cooperates with the limiting blade is provided on the lock body; the side of the limiting blade facing the unlocking direction is an inclined surface, and the side facing away from the unlocking direction is a vertical surface.

[0019] Optionally, the limiting notch includes a first notch and a second notch; when the lock cylinder is at the initial angle, the limiting blade extends into the first notch, and when it is at the changing angle, the limiting blade extends into the second notch.

[0020] Optionally, the lock cylinder has a first groove on its end face facing the lock tail, the lock tail has a second groove that extends through both ends, and the lock body has a third groove; when the number-changing block is in the unlocked position, a part of it is located in the first groove and another part is located in the second groove; when the number-changing block is in the number-changing position, a part of it is located in the second groove and another part is located in the third groove.

[0021] Optionally, it also includes a number-changing block spring, wherein a receiving groove is provided in the middle of the second groove, and the number-changing block spring is installed in the receiving groove and abuts against the number-changing block to drive the number-changing block to reset to the unlock position.

[0022] Optionally, a partition is also included, with the lock cylinder and the clutch block located on opposite sides of the partition, and the partition having through holes for the clutch teeth to pass through.

[0023] Secondly, the present invention provides a lock system, including an unlocking key, a key changer key, and the aforementioned blade-type key changer lock;

[0024] The insertion end of the key-changing device is longer than the insertion end of the key-unlocking device. When the key-unlocking device is inserted into the lock cylinder, the key-changing block is in the unlocked position. When the key-changing device is inserted into the lock cylinder, it drives the key-changing block to move axially to the key-changing position.

[0025] The unlocking keys include a first unlocking key and a second unlocking key, and the number-changing keys include a first number-changing key and a second number-changing key. The first unlocking key and the first number-changing key have the same first unlocking groove, and the second unlocking key and the second number-changing key have the same second unlocking groove. The first unlocking groove and the second unlocking groove respectively ensure that at least one clutch tooth is engaged in a different clutch tooth groove.

[0026] Thirdly, the present invention provides a method for changing the lock number in the above-mentioned lock system, comprising the following steps:

[0027] Insert the first key to change the lock number, drive the key change block to the key change position, and make the lock tail and lock body drive connection;

[0028] Turn the first key to change the lock number, so that the lock cylinder and the clutch block rotate relative to the lock tail. During the rotation, the drive part of the lock tail drives the clutch block to move axially until the engagement structure is disengaged.

[0029] Remove the first key and insert the second key;

[0030] Turn the second key to make the lock cylinder and clutch block rotate relative to the lock tail. During the rotation, the drive part of the lock tail drives the clutch block to move axially in the opposite direction until the engagement structure re-engages.

[0031] Compared with the prior art, the advantages of this invention are as follows:

[0032] 1. This application achieves control over key number changing permissions through the coordination of the key-changing block and key length: The shorter insertion end of the unlocking key cannot reach the key-changing block during insertion, and the block, under spring pressure, remains in the unlocking position connecting the lock cylinder and the lock tail, preventing key number changing; the longer insertion end of the key-changing key pushes the key-changing block axially to the key-changing position connecting the lock body and the lock tail, preparing for key number changing. This design prevents the unlocking key from triggering the key number changing operation, ensuring that only personnel using the designated key-changing block can perform the change, eliminating the possibility of unauthorized key number changing and improving the security of the lock system.

[0033] 2. The number changing operation of this application requires no additional tools: When the number changing key is inserted, its longer insertion end automatically pushes the number changing block to the number changing position; when the key is turned to the number changing angle, the clutch block automatically slides into the number changing slot with the cooperation of the drive block, and the clutch teeth disengage from the clutch tooth slot; after inserting the new number changing key, turning the key causes the second conical protrusion of the clutch block to automatically slide out of the number changing slot, and the clutch teeth enter the new clutch tooth slot, completing the number changing. The entire number changing process only requires inserting, removing, and turning the key, making the operation quite simple. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the split structure of the blade-type number-changing lock according to an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the lock body structure according to an embodiment of this application. Figure 1 ;

[0036] Figure 3 This is a schematic diagram of the lock body structure according to an embodiment of this application. Figure 2 ;

[0037] Figure 4 This is a schematic diagram of the structure of the lock cylinder, drive blade, and drive blade spring according to an embodiment of this application;

[0038] Figure 5 This is a schematic diagram of the split structure of the clutch block, clutch blade, and stop lever according to an embodiment of this application;

[0039] Figure 6 This is a schematic diagram of the clutch block structure according to an embodiment of this application;

[0040] Figure 7 This is a schematic diagram of the split structure of the tail lock and number changing block according to an embodiment of this application;

[0041] Figure 8 This is a schematic diagram of the internal structure of an embodiment of this application when no key is inserted;

[0042] Figure 9 This is a cross-sectional view of an embodiment of this application when no key is inserted;

[0043] Figure 10 This is a schematic diagram of the internal structure of the unlocking key when it is rotated to the unlocking angle according to an embodiment of this application;

[0044] Figure 11 This is a cross-sectional view of the unlocking key when it is rotated to the unlocking angle according to an embodiment of this application.

[0045] Figure 12 This is a schematic diagram of the internal structure when inserting the key for changing the number, according to an embodiment of this application.

[0046] Figure 13 This is a cross-sectional view of the insertion of the key for changing the number in an embodiment of this application;

[0047] Figure 14 This is a schematic diagram showing the position of the clutch block when inserting the key for changing the number, according to an embodiment of this application.

[0048] Figure 15 This is a schematic diagram showing the position of the clutch block when the key for changing numbers is rotated to the changing angle according to an embodiment of this application.

[0049] Figure 16 This is a cross-sectional view of the key for changing numbers when it is rotated to the changing angle according to an embodiment of this application.

[0050] Figure 17 This is a schematic diagram showing the separation of the drive blade and clutch blade when the key for changing numbers is turned to the changing angle according to an embodiment of this application.

[0051] Figure 18 This is a schematic diagram of the structure of the unlocking key and the key changing number according to an embodiment of this application;

[0052] Figure 19 A flowchart illustrating the number changing method provided in this application embodiment;

[0053] Explanation of reference numerals in the attached figures:

[0054] 10-Lock body; 101-Locking groove; 102-Third groove; 103-First notch; 104-Second notch; 105-Limiting boss; 106-Limiting groove; 11-Drive block;

[0055] 20-Locking cylinder; 201-Drive blade mounting slot; 202-First groove; 203-Limiting blade mounting slot; 21-Drive blade; 211-Clutch tooth; 212-Blade drive block; 22-Drive blade spring; 23-Limiting blade; 231-Inclined surface; 232-Vertical surface; 24-Limiting blade spring;

[0056] 30-Clutch block; 301-Clutch blade mounting groove; 302-Stop lever mounting groove; 303-Stop lever spring mounting hole; 304-First conical protrusion; 305-Second conical protrusion; 31-Clutch blade; 311-Clutch tooth groove; 312-Blade locking groove; 32-Stop lever; 33-Stop lever spring;

[0057] 40-Lock tail; 401-Number changing groove; 402-Second groove; 403-Accommodation groove; 41-Limiting plate; 411-Limiting groove;

[0058] 50 - Number changing block; 51 - Number changing block spring;

[0059] 60-partition;

[0060] 70 - Unlock key; 701 - Unlock slot;

[0061] 80 - Change key; 801 - convex surface. Detailed Implementation

[0062] To make the objectives and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] In some embodiments of the present invention, such as Figure 1 As shown, a blade-type number-changing lock is provided, which includes a lock body 10, a lock cylinder 20, a clutch block 30, a lock tail 40, and a number-changing block 50.

[0064] The lock body 10 has a hollow cavity, and the lock cylinder 20 is rotatably installed in the hollow cavity of the lock body 10, with a key slot opened along the axial direction. The clutch block 30 is axially movable and installed on the lock cylinder 20, and can rotate with the lock cylinder 20. The lock tail 40 is rotatably installed on the tail end of the lock body 10 and abuts against the tail ends of the lock cylinder 20 and the clutch block 30. The key-changing block 50 is axially movable and installed on the lock tail 40.

[0065] In this embodiment, the first end refers to the end closest to the keyhole, i.e., the key insertion end; the last end is the end furthest from the keyhole. The lock tail 40 is a metal shaft-like structure extending from the last end of the lock body 10, used to connect the bolt or handle.

[0066] like Figure 4 and Figure 5 As shown, the clutch block 30 has multiple clutch blade mounting slots 301 spaced along the axial direction (key insertion direction), and each clutch blade mounting slot 301 has a clutch blade 31 that is radially movable. The clutch blade 31 has a locked position that locks the lock body 10 and the lock cylinder 20 (e.g., Figure 8 and Figure 9 As shown), and the unlocking positions of the lock body 10 and the lock cylinder 20 (as shown). Figures 10 to 13 (As shown).

[0067] The lock cylinder 20 has multiple drive blade mounting slots 201 spaced axially, and each drive blade 21 is radially movable in each drive blade mounting slot 201. The number of drive blades 21 is the same as the number of clutch blades 31, and each drive blade 21 and its corresponding clutch blade 31 are respectively provided with a clutch tooth 211 and a clutch tooth groove 311 that cooperate with each other. The clutch tooth 211 can be engaged in the corresponding clutch tooth groove 311, and the two together form a separable meshing structure. When a key is inserted, the unlocking slot of the key drives the drive blade 21 to move, and the drive blade 21 drives the clutch blade 31 to move between the unlocked position and the locked position.

[0068] Clutch block 30 has an engagement position (such as...) Figure 14 (as shown) and separation location (as shown) Figure 15 (As shown). When the clutch block 30 is in the engaged position, the clutch teeth 211 are engaged in the clutch tooth groove 311 (as shown). Figure 8 As shown), the drive blade 21 can drive the clutch blade 31 to move; when the clutch block 30 is in the disengaged position, the clutch tooth 211 disengages from the clutch tooth groove 311 (as shown). Figure 17 As shown in the figure, the drive blade 21 cannot drive the clutch blade 31 to move.

[0069] In this embodiment, the clutch teeth 211 are disposed on the drive blade 21, and the clutch tooth grooves 311 are disposed on the corresponding clutch blades 31. It is understood that in other embodiments, the clutch tooth grooves 311 may also be disposed on the drive blade 21, and the clutch teeth 211 may be disposed on the corresponding clutch blades 31. The key is to ensure that the clutch teeth 211 can be engaged in the clutch tooth grooves 311, allowing the drive blade 21 to drive the clutch blades 31 to move.

[0070] like Figure 4 As shown, the drive blade 21 is provided with a blade drive block 212. When the key is inserted, the key's unlocking slot drives the blade drive block 212 to move, thereby causing the drive blade 21 to move, which in turn drives the clutch blade 31 to move back and forth.

[0071] like Figure 4 As shown, the lock cylinder 20 also includes drive vane springs 22, which are respectively disposed in the drive vane mounting grooves 201 and abut against the corresponding drive vanes 21. The drive vane springs 22 are used to provide a restoring force for the drive vanes 21 to return to the locked position of the corresponding clutch vanes 31.

[0072] like Figure 5 and Figure 6As shown, the leaf lock in this embodiment uses a stop lever to achieve locking and unlocking. Specifically, the clutch block 30 has a stop lever mounting groove 302, and the stop lever 32 can move radially within the stop lever mounting groove 302. The lock body 10 has a locking groove 101, and the clutch leaf 31 has a leaf locking groove 312.

[0073] When the clutch blade 31 is in the unlocked position, such as Figure 10 , Figure 12 and Figure 17 As shown, the blade locking groove 312 coincides with the stop bar mounting groove 302, allowing the stop bar 32 to fall into the blade locking groove 312. At this time, the clutch block 30 and the lock cylinder 20 can rotate relative to the lock body 10, and the lock cylinder is in the unlocked state.

[0074] When the clutch blade 31 is in the locked position, such as Figure 8 and Figure 9 As shown, the leaf locking groove 312 and the stop bar mounting groove 302 are offset at a certain angle. The clutch leaf 31 stops the stop bar 32 and moves it into the stop bar mounting groove 302. The stop bar 32 protrudes out of the stop bar mounting groove 302 and partially extends into the locking groove 101 of the lock body 10. At this time, the clutch block 30 and the lock cylinder 20 cannot rotate relative to the lock body 10, and the lock cylinder is in the locked state.

[0075] The clutch block 30 is also equipped with a stop spring 33. Stop spring mounting holes 303 are radially provided at both ends of the stop spring mounting groove 302. The stop spring 33 is installed in the stop spring mounting holes 303, with one end abutting against the stop rod 32 and the other end abutting against the bottom surface of the stop spring mounting hole 303. The stop spring 33 provides a restoring force for the stop rod 32 to enter the locking groove 101. When the lock cylinder 20 is at the initial angle, such as... Figure 13 As shown, due to the restoring force of the stop lever spring 33, the stop lever 32 can quickly enter the locking groove 101 of the lock body 10, thereby realizing the smooth locking of the leaf lock.

[0076] like Figure 7 As shown, the lock tail 40 has a driving part for axial movement of the clutch block 30. In this embodiment, the driving part is a number-changing groove 401 formed on the end face of the lock tail 40. Simultaneously, the end face of the lock tail 40 also has a second groove 402 extending axially, with both ends of the second groove 402 being through-holes. The end face of the lock cylinder 20 facing the lock tail 40 has a first groove 202, and the lock body 10 has a third groove 102.

[0077] like Figure 3 , Figure 4 and Figure 7 As shown, the number-changing block 50 is axially movable within the second groove 402 and has two working positions:

[0078] Unlocking position: Part of the number-changing block 50 is located in the first groove 202, and another part is located in the second groove 402. At this time, the number-changing block 50 connects the lock cylinder 20 and the lock tail 40, allowing the lock cylinder 20, clutch block 30, and lock tail 40 to rotate as a whole. This position corresponds to... Figure 8 The key is not inserted as shown. Figure 10 The image shows the state when the unlocking key is turned 90°. At this time, because the key-changing block 50 rotates as a whole with the lock cylinder 20 and the lock tail 40, its position relative to the unlocking key 70 remains unchanged.

[0079] Number-changing position: Part of the number-changing block 50 is located in the second groove 402, and another part is located in the third groove 102. At this time, the number-changing block 50 connects the lock body 10 and the lock tail 40, so that the lock tail 40 and the lock body 10 are relatively fixed, and the lock cylinder 20 and the clutch block 30 can rotate relative to the lock tail 40. This position corresponds to... Figure 12 The key number changer is inserted at position 80, and... Figure 17 The image shows the state of the key 80 when it is turned 180°.

[0080] like Figure 7 As shown, the second groove 402 has a receiving groove 403 in the middle. The number changing block spring 51 is installed in the receiving groove 403 and abuts against the number changing block 50 to drive the number changing block 50 to reset to the unlock position.

[0081] During the key-changing process, after the key-changing block 50 is pushed to the key-changing position by the first key-changing key, the key-changing block spring 51 is compressed. When the first key-changing key is removed, the second key-changing key is inserted, and the key-changing is completed, when the second key-changing key is removed, the key-changing block spring 51 automatically drives the key-changing block 50 to return to the unlocking position, reconnecting the lock cylinder 20 and the lock tail 40, restoring the lock to its normal unlocking state. This automatic reset mechanism avoids human error or oversight, improving the reliability of the lock.

[0082] like Figure 1 , Figure 5 and Figure 6 As shown, to enable the circumferential movement of the clutch block 30, a drive block 11 is installed at the head end of the lock body 10. The clutch block 30 has a first conical protrusion 304 at the end facing the drive block 11 and a second conical protrusion 305 at the end facing the number changing slot 401. Figure 15 As shown, when the lock cylinder 20 rotates to the changing angle, the drive block 11 abuts against the first conical protrusion 304, restricting the clutch block 30 from continuing to rotate forward; at the same time, the second conical protrusion 305 is aligned with the changing groove 401 of the lock tail 40, and the clutch block 30 can move axially under the action of axial force, so that the second conical protrusion 305 extends into the changing groove 401. At this time, the clutch tooth 211 disengages from the clutch tooth groove 311, realizing the preparation for changing the lock size. Figure 17 As shown.

[0083] The above-mentioned method of achieving synchronous circumferential and axial movement of clutch block 30 through the combination of limit block 11, limit groove 401 and conical protrusion can also be achieved through the following approximate scheme.

[0084] As a variation, the limiting block 11 can be replaced by a compression spring. The compression spring is located between the clutch block 30 and the locking cylinder 20. When the second conical protrusion 305 rotates to the position aligned with the limiting groove 401, the compression spring releases its elastic force, pushing the second conical protrusion 305 of the clutch block 30 into the limiting groove 401.

[0085] To make the fit between the second conical protrusion 305 and the limiting groove 401 smoother, the two ends of the limiting groove 401 can be set as inclined surfaces, or even as arc-shaped surfaces with high ends and low middle.

[0086] As an alternative, the drive portion on the lock tail 40 for driving the axial movement of the clutch block 30 can be configured as a V-shaped boss. When the clutch block 30 rotates relative to the lock tail 40, the V-shaped boss can push the clutch block 30 away from the lock tail 40, achieving axial movement. To ensure that the clutch block 30 can automatically return to its original position after leaving the V-shaped boss, a compression spring can be installed between the clutch block 30 and the lock cylinder 20. The installation of this compression spring also ensures that the clutch block 30 will not easily move axially during normal unlocking, thus stably maintaining itself in the engaged position.

[0087] To avoid interference between the V-shaped boss and the lock cylinder 20, an annular groove can be provided on the tail end face of the lock cylinder 20; when the lock cylinder 20 rotates relative to the lock tail 40, the V-shaped boss is just accommodated in the annular groove.

[0088] like Figure 3 and Figure 7 As shown, the tail end of the lock body 10 is provided with a limiting boss 105, and the end of the lock tail 40 extending out of the lock body 10 is fitted with a limiting plate 41. The limiting plate 41 is provided with a limiting groove 411 that mates with the limiting boss 105. The limiting boss 105 is positioned when the lock cylinder 20 is in the... Figure 8 The initial angle shown indicates that it abuts against one end of the limiting groove 411, and the lock cylinder 20 is in position. Figure 10 The unlocking angle shown is when it abuts against the other end of the limiting groove 411. The locking angle is defined by the cooperation between the limiting groove 411 and the limiting boss 105.

[0089] like Figure 2 and Figure 4 As shown, the lock cylinder 20 has a limiting blade mounting groove 203 at one end near the keyhole, and the limiting blade 23 is movably mounted in the limiting blade mounting groove 203. The limiting blade spring 24 is disposed in the limiting blade mounting groove 203 and abuts against the limiting blade 23, and is used to provide a restoring force for the limiting blade 23 to extend into the limiting notch.

[0090] The lock body 10 has a limiting notch that mates with the limiting blade 23. The limiting blade 23 has an inclined surface 231 on the side facing the unlocking direction and a vertical surface 232 on the other side facing away from the unlocking direction. This design ensures that the lock cylinder 20 can only rotate in the unlocking direction (e.g., clockwise) and cannot rotate in reverse, thus increasing security.

[0091] The limiting notches include a first notch 103 and a second notch 104. When the lock cylinder 20 is at its initial angle, the limiting blade 23 partially extends into the first notch 103; when the lock cylinder 20 rotates to the changing angle, the limiting blade 23 partially extends into the second notch 104. The positions of these two notches precisely define the initial angle and the changing angle of the lock cylinder 20.

[0092] like Figure 16 As shown, the lock body 10 is also provided with a limiting groove 106. When the second conical protrusion 305 of the clutch block 30 is fully inserted into the changing groove 401 and the clutch tooth 211 disengages from the clutch tooth groove 311, the stop lever 32 just slides into the limiting groove 106, improving the operating feel and preventing over-tightening. At the same time, the depth of the limiting groove 106 is less than the depth of the locking groove 101, ensuring that the stop lever 32 will not disengage from the blade locking groove 312 of the clutch blade 31, so that the stop lever 32 can maintain the translational restriction of the clutch blade 31, ensuring that the clutch blade 31 will not move horizontally during the changing process, and avoiding the problem of misalignment of the clutch tooth groove 311.

[0093] As can be seen, this application ensures the accuracy of the number-changing operation through a multi-limiting structure: First, the cooperation between the limiting blade 23 and the first notch 103 and the second notch 104 precisely limits the initial angle and the number-changing angle of the lock cylinder 20; Second, when the lock cylinder 20 is at the number-changing angle, the second conical protrusion 305 of the clutch block 30 extends into the number-changing groove 401 of the lock tail 40, and the stop lever 32 is simultaneously located in the limiting groove 106 and the blade locking groove 312. The clutch block 30 and the clutch blade 31 on it maintain good positional accuracy, ensuring that the clutch tooth 211 can accurately disengage and extend into the clutch tooth groove 311, thus ensuring the high reliability of the number-changing operation.

[0094] like Figure 1 As shown, the blade-type key-changing lock of this embodiment also includes a partition 60, with the lock cylinder 20 and clutch block 30 located on opposite sides of the partition 60. The partition 60 has a through hole for the clutch teeth 211 to pass through. This through hole is a radially extending strip-shaped hole, ensuring that the drive blade 21 does not interfere with the partition 60 when moving radially. The partition 60 prevents dust from entering the clutch block 30 through the key slot of the lock cylinder 20, thus avoiding product jamming.

[0095] like Figure 18As shown, this embodiment also provides a lock system, including an unlocking key 70, a number-changing key 80, and the aforementioned blade-type number-changing lock. The unlocking key 70 can be divided into a first unlocking key and a second unlocking key depending on the unlocking slot 701; correspondingly, the number-changing key 80 is also divided into a first number-changing key and a second number-changing key.

[0096] Specifically, the first unlocking key and the first change key have the same first unlocking groove, meaning both can drive the drive blade 21 to the correct position, causing the clutch blade 31 to move between the unlocked and locked positions, thus achieving the unlocking function. Similarly, the second unlocking key and the second change key have the same second unlocking groove.

[0097] The end of the key-changing key 80 is provided with a protrusion 801 for abutting against the key-changing block 50. The protrusion 801 is provided so that the insertion length of the key-changing key 80 (first key-changing key, second key-changing key) is greater than the insertion length of the unlocking key 70 (first unlocking key, second unlocking key). When the unlocking key 70 is inserted, because its length is insufficient, it cannot reach the key-changing block 50, and the key-changing block 50 is held in the unlocked position by the action of the key-changing block spring 51; when the key-changing key 80 is inserted, its protrusion 801 can push the key-changing block 50 to move axially, moving it from the unlocked position to the key-changing position.

[0098] This design fundamentally solves the problem of unauthorized number switching: although users holding the unlocking key 70 can unlock the door normally, they cannot switch numbers themselves because the key is not long enough to drive the number switching block 50; only authorized personnel (such as landlords or administrators) holding the dedicated number switching key 80 can perform the number switching operation.

[0099] like Figure 19 As shown, this embodiment also provides a method for changing the lock number in the above-mentioned lock system, including the following steps:

[0100] Step S1: Insert the first key to change the lock number, drive the key to change the lock number block to the key to change the lock number position, so that the lock tail is connected to the lock body.

[0101] like Figures 12 to 14 As shown, when changing the lock key, a first key with the same first unlocking slot as the first unlocking key is inserted, putting the lock cylinder in the unlocked state. At this time, because the insertion end of the first key with the changed lock key is longer, it pushes the key changing block 50 to move axially to the key changing position, so that the lock tail 40 is connected and fixed to the lock body 10. At this time, the key changing block spring 51 is compressed.

[0102] Step S2: Turn the first key to change the lock number, so that the lock cylinder and the clutch block rotate relative to the lock tail. During the rotation, the drive part of the lock tail drives the clutch block to move axially until the engagement structure is disengaged.

[0103] like Figures 15 to 17As shown, the first key for changing the lock number is turned clockwise approximately 180°. During this process, the drive block 11 on the lock body 10 first abuts against the first conical protrusion 304 of the clutch block 30, restricting the clutch block 30 from continuing to rotate forward. At this time, the second conical protrusion 305 of the clutch block 30 is also aligned with the key-changing groove 401 of the lock tail 40. Under the axial force generated by the conical inclined surface, the clutch block 30 moves axially, causing the second conical protrusion 305 to extend into the key-changing groove 401. Simultaneously, the stop lever 32 slides into the limiting groove 106, and with a "click" sound, the clutch block 30 reaches the disengagement position, and the clutch teeth 211 disengage from the clutch tooth groove 311. The clutch blade 31 remains in the unlocked position under the restriction of the stop lever 32, completing the key-changing preparation.

[0104] Step S3: Remove the first key and insert the second key.

[0105] After the first key change is removed, the drive vane 21 returns to its default position (the clutch vane 31 is in the locked position) under the action of the drive vane spring 22. The second key change is then inserted, causing the drive vane 21 to engage with the second unlocking slot of the second key change. During this process, the clutch vane 31 remains stationary, maintaining the unlocked position, and the lock number has been changed.

[0106] Step S4: Turn the second key to make the lock cylinder and clutch block rotate relative to the lock tail. During the rotation, the drive part of the lock tail drives the clutch block to move axially in the opposite direction until the engagement structure re-engages.

[0107] Continue turning the second key clockwise to return to the initial angle. During this process, the second conical protrusion 305 of the clutch block 30 first abuts against the end face of the key-changing groove 401, restricting the clutch block 30 from continuing to rotate forward. Under the axial force generated by the conical inclined surface, the clutch block 30 moves axially, causing the second conical protrusion 305 to disengage from the key-changing groove 401, and the clutch block 30 returns to the engaged position, with the clutch teeth 211 extending into the clutch tooth groove 311 that matches the second unlocking groove.

[0108] After the cylinder 20 returns to its initial angle, the second key changer is removed. At this time, the key changer block 50 automatically resets to the unlocking position under the action of the key changer block spring 51, reconnecting the cylinder 20 and the tail 40, restoring the lock to its normal unlocking state. The key changer operation is complete. After this, the second key with the second unlocking slot can unlock normally, while the first key and the first key changer are no longer usable.

[0109] It's understandable that before changing the key, the first key could open the lock cylinder, but the second key couldn't. After changing the lock number, the second key could open the lock cylinder, but the first key couldn't. Alternatively, the key-changing process could continue, allowing the first key to open the lock cylinder again, while the second key would no longer be able to.

[0110] In summary, this application, through the innovative design of the number-changing block, enables convenient number changing without tools and fundamentally solves the security risks of unauthorized number changing. It has the advantages of convenient operation, high security, and reliable structure.

[0111] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A leaf-type number-changing lock, characterized in that, include: The lock body (10) has a hollow cavity; The lock cylinder (20) is rotatably installed in the hollow cavity of the lock body (10); The clutch block (30) is axially movable and mounted on the lock cylinder (20) and can rotate with it. A separable engagement structure is provided between the lock cylinder (20) and the clutch block (30). The lock tail (40) is rotatably mounted on the tail end of the lock body (10), and the lock tail (40) is provided with a driving part for driving the clutch block (30) to move axially; A number-changing block (50) is axially movable and installed on the lock tail (40). The number-changing block (50) has an unlocking position and a number-changing position. When the number-changing block (50) is in the unlocked position, the number-changing block (50) drives the lock cylinder (20) and the lock tail (40) to rotate together, and the lock cylinder (20), the clutch block (30) and the lock tail (40) are axially limited between the lock cylinder (20) and the lock tail (40); When the number-changing block (50) is in the number-changing position, the number-changing block (50) is connected to the lock body (10) and the lock tail (40). The lock cylinder (20) and the clutch block (30) can rotate relative to the lock tail (40), and the clutch block (30) can move axially under the drive of the drive unit so that the meshing structure is separated.

2. The leaf-type number-changing lock according to claim 1, characterized in that, The driving part is a number changing slot (401) opened on the lock tail (40); the lock body (10) is provided with a driving block (11). When the clutch block (30) rotates relative to the lock tail (40), the driving block (11) can push the clutch block (30) and make it move axially into the number changing slot (401).

3. The leaf-type number-changing lock according to claim 1, characterized in that, The tail end of the lock body (10) is provided with a limiting boss (105), and the lock tail (40) is provided with a limiting groove (411) that cooperates with the limiting boss (105); the limiting boss (105) abuts against one end of the limiting groove (411) when the lock cylinder (20) is at the initial angle, and abuts against the other end of the limiting groove (411) when the lock cylinder (20) is at the unlocking angle.

4. The leaf-type number-changing lock according to claim 1, characterized in that, The lock cylinder (20) can also be movably installed with a limiting blade (23), and the lock body (10) is provided with a limiting notch that cooperates with the limiting blade (23); the side of the limiting blade (23) facing the unlocking direction is an inclined surface (231), and the side facing away from the unlocking direction is a vertical surface (232).

5. The leaf-type number-changing lock according to claim 4, characterized in that, The limiting notch includes a first notch (103) and a second notch (104); when the lock cylinder (20) is at the initial angle, the limiting blade (23) extends into the first notch (103), and when it is at the changing angle, the limiting blade (23) extends into the second notch (104).

6. The leaf-type number-changing lock according to claim 1, characterized in that, The lock cylinder (20) has a first groove (202) on its end face facing the lock tail (40), the lock tail (40) has a second groove (402) that extends through both ends, and the lock body (10) has a third groove (102). When the number changing block (50) is in the unlocked position, part of it is located in the first groove (202) and the other part is located in the second groove (402). When the number changing block (50) is in the number changing position, part of it is located in the second groove (402) and the other part is located in the third groove (102).

7. The blade-type number-changing lock according to claim 6, characterized in that, It also includes a number-changing block spring (51), and the second groove (402) has a receiving groove (403) in the middle. The number-changing block spring (51) is installed in the receiving groove (403) and abuts against the number-changing block (50) to drive the number-changing block (50) to reset to the unlock position.

8. The leaf-type number-changing lock according to claim 1, characterized in that, It also includes a partition (60), the lock cylinder (20) and the clutch block (30) are located on both sides of the partition (60), and the partition (60) is provided with a through hole for the meshing structure to pass through.

9. A locking system, characterized in that, Includes an unlocking key (70), a number-changing key (80), and a blade-type number-changing lock as described in any one of claims 1 to 8; The insertion length of the key-changing key (80) is greater than the insertion length of the unlocking key (70). When the unlocking key (70) is inserted into the lock cylinder (20), the key-changing block (50) is in the unlocked position. When the key-changing key (80) is inserted into the lock cylinder (20), it drives the key-changing block (50) to move axially to the key-changing position.

10. A method for changing the lock number in the lock system of claim 9, characterized in that, Includes the following steps: Insert the first key to change the lock number, drive the key change block (50) to the key change position, and make the lock tail (40) and the lock body (10) drive connection; Turn the first key to make the lock cylinder (20) and the clutch block (30) rotate relative to the lock tail (40). During the rotation, the driving part of the lock tail (40) drives the clutch block (30) to move axially until the engagement structure is separated. Remove the first key and insert the second key; Turn the second key to make the lock cylinder (20) and the clutch block (30) rotate relative to the lock tail (40). During the rotation, the drive part of the lock tail (40) drives the clutch block (30) to move axially in the opposite direction until the engagement structure re-engages.

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