Coded lock

Abstract

A coded lock comprises a shell, a character wheel code assembly, a button assembly, a shifting piece and an output shaft are installed on the shell, the button assembly is used for shifting code wheels of the character wheel code assembly to rotate, a spring bolt synchronously rotating along with the output shaft is installed at the output end of the output shaft, one end of the shifting piece abuts against the outer circumferential face of the output shaft all the time, and the other end of the shifting piece abuts against the outer circumferential face of the output shaft. The outer circumferential face of the output shaft is provided with contact parts which are different in depth and make contact with the shifting piece, in the rotating process of the output shaft, the shifting piece can make contact with the contact parts different in depth and make axial movement relative to the character wheel password assembly, and then the password lock is switched among the locking state, the unlocking state and the password setting state. When the coded lock works, state switching of the coded lock can be achieved only by rotating the output shaft, operation is easy and convenient, in addition, the push rod assembly is further installed on the shell, when manual zero clearing operation needs to be conducted on the coded lock, only the push rod assembly needs to be pushed, and operation is very convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of locks, in particular to a password lock. Background Art

[0002] The issue of property and information security has always been a matter of great importance to all walks of life, so locks are used everywhere. Traditional locks require carrying keys with you, which brings a lot of inconvenience and even trouble. However, combination locks are becoming more and more popular and used because they do not require keys. Common combination locks usually include digital key combination locks and dial combination locks. For example, the combination lock disclosed in the Chinese utility model patent with patent number 202021447239.0 (authorization announcement number CN 213683572 U) includes a main body, a lock assembly, an unlocking assembly used in conjunction with the lock assembly, and a password assembly for adjusting the state of the unlocking assembly; the lock assembly includes a lock member mounted on the main body; the unlocking assembly includes an unlocking member mounted on the main body, a first elastic member connected to the unlocking member for resetting the unlocking member, a transmission plate for driving the unlocking member to move, and a movable slide mounted on the main body and connected to the transmission plate to drive the transmission plate to move; the unlocking member is provided with an anti-deflection groove; the transmission plate is provided with an anti-deflection portion used in conjunction with the anti-deflection groove to prevent the transmission plate from deflecting. This combination lock uses a sliding seat to drive the transmission plate, which in turn drives the unlocking member to move synchronously, releasing the unlocking member from its tight contact with the locking member. To ensure transmission stability between the transmission plate and the unlocking member, this mechanical combination lock requires the use of an anti-deflection portion and an anti-deflection groove, resulting in a relatively complex structure. Furthermore, this combination lock lacks a mechanism for manually resetting the public combination. In summary, further improvements to existing combination lock structures are needed. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a combination lock with a simple structure and capable of switching between a locked state, an unlocked state and a password setting state by rotating an output shaft in response to the above-mentioned existing technical status.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a combination lock, including a shell, on which a word wheel password assembly, a button assembly, a toggle piece and an output shaft are installed, the button assembly is used to toggle the password wheel of the word wheel password assembly to rotate, and the output end of the output shaft is equipped with a lock tongue that rotates synchronously with the output shaft, which is characterized in that: one end of the toggle piece is always in contact with the outer peripheral surface of the output shaft, the outer peripheral surface of the output shaft has contact parts of different depths that contact the toggle piece, and during the rotation of the output shaft, the toggle piece can contact the contact parts of different depths and move axially relative to the word wheel password assembly, thereby switching the combination lock between a locked state, an unlocked state and a password setting state.

[0005] In order to enable the output shaft to smoothly drive the toggle piece to move axially during rotation, the outer circumferential surface of the output shaft has a large arc surface with a larger radius, a small arc surface with a smaller radius, and a groove connected between the large arc surface and the small arc surface and further deepened inward from the small arc surface. In the locked state, the end of the toggle piece is against the small arc surface. In the unlocked state, the end of the toggle piece is against the large arc surface. In the password setting state, the end of the toggle piece extends into the groove.

[0006] The wheel password assembly can have a variety of structures. Preferably, the wheel password assembly includes an axle, a sleeve, a password wheel, a torsion spring, and a reset spring. The sleeve and the password wheel are sleeved on the axle, and the password wheel is further sleeved on the sleeve. A clutch structure is provided between the password wheel and the sleeve. The torsion spring is sleeved on the axle, and the two ends of the torsion spring are respectively mounted on the housing and the password wheel to keep the password wheel from rotating and having a tendency to reset. The reset spring is sleeved on the axle and abuts against the password wheel and the sleeve. The sleeve always keeps a tendency to move outward to separate the clutch structure. When the clutch structure is separated, the password wheel can rotate relative to the sleeve to set the password. With this arrangement, the torsion spring can smoothly reset the password wheel after rotation, and the reset spring can drive the sleeve to move outward relative to the password wheel in the password setting state.

[0007] There are various types of clutch structures. Preferably, the clutch structure includes a rib protruding from the outer circumferential wall of the sleeve and a keyway formed on the inner circumferential wall of the code wheel. The rib is arranged along the circumference of the sleeve, and the keyway is arranged along the circumference of the code wheel. The toggle piece can drive the sleeve to move toward the interior of the code wheel so that the rib is engaged with the corresponding keyway. The reset spring can drive the sleeve to move toward the exterior of the code wheel so that the rib is disengaged from the corresponding keyway. When the rib is engaged with the keyway, the sleeve and the code wheel rotate synchronously. When the rib is disengaged from the keyway, the code wheel can rotate relative to the sleeve. In this arrangement, the rib and the keyway can cooperate to enable the sleeve and the code wheel to rotate synchronously or to enable the code wheel to rotate relative to the sleeve. When the rib is disengaged from the keyway, the code wheel can rotate relative to the sleeve, at which time the code can be set or the code wheel can be reset after the code is set. When the rib is engaged with the keyway, the code wheel and the sleeve can only rotate simultaneously, at which time the code can be entered.

[0008] Further preferably, the shaft sleeve is sequentially formed with a shaft sleeve body, a first boss and a second boss from inside to outside in the axial direction, the outer diameter of the second boss is larger than that of the first boss, the reinforcing ribs are circumferentially spaced on the outer peripheral wall of the first boss, and the second boss is circumferentially provided with a notch, the toggle piece is provided with a protrusion matched with the notch, and the protrusion can be inserted into the notch under the drive of the output shaft when the notch is aligned with the protrusion. In this way, after the correct password is input in the locked state, the shaft sleeve and the password wheel are synchronously rotated to the position where the notch is aligned with the protrusion, the toggle lever can make the protrusion inserted into the corresponding notch under the drive of the output shaft, and the unlocking is realized.

[0009] In order to realize the manual reset of the password wheel, a push rod assembly is further installed on the shell, the push rod assembly is provided with a clamping block matched with the password wheel, the clamping block can be clamped on the password wheel to prevent the rotation of the password wheel, and the password wheel can be rotated relative to the shell to set the password or reset the password when the clamping block is disengaged from the password wheel.

[0010] The push rod assembly can have various structures, and preferably, the push rod assembly comprises a push rod body and a compression spring, the push rod body is installed on the shell, the clamping block is arranged on the side of the push rod body, and the compression spring is arranged between the end of the push rod body and the shell. The elastic force of the compression spring on the push rod body makes the clamping block have a tendency to be clamped on the password wheel, an external force drives the movement of the push rod assembly and compresses the compression spring to disengage the clamping block from the password wheel. In this way, when the clamping block is clamped on the password wheel, the password wheel can be rotated under the pressing of the button assembly, but the rotated password wheel cannot be reset. After the clamping block is disengaged from the password wheel under the driving of the external force, the rotated password wheel is immediately reset.

[0011] In order to reset the password wheel during the rotation of the output shaft, the side of the push rod body facing the output shaft is provided with a mounting groove, the mounting groove is provided with an elastic toggle piece and a movable stopper, the elastic toggle piece acts on the movable stopper to make the movable stopper have a tendency to move outward, the outer peripheral wall of the output shaft is provided with a top block, and during the rotation of the output shaft to the position where the top block abuts against the movable stopper, the top block drives the movable stopper to move to the inside of the mounting groove to compress the elastic toggle piece, and the movable stopper drives the push rod body to move to the direction of the compression spring to disengage the clamping block from the password wheel.

[0012] In order to limit the rotation of the output shaft, the outer wall of the output shaft is provided with a limiting block, the inside of the shell is formed with a first limiting wall and a second limiting wall, in the locked state, the output shaft rotates to the limiting block abutting against the first limiting wall to make the lock tongue in 0° position, in the password setting state, the output shaft rotates to the limiting block abutting against the second limiting wall to make the lock tongue in 180° position, in the unlocking state, the lock tongue is in 90° position. If the password lock is vertically installed, the 0° position and the 180° position are horizontal positions and the directions are opposite, and the 90° position is a vertical position.

[0013] In order to limit the rotation of the output shaft in the unlocking state and the password setting state, the outer wall of the output shaft is provided with a first limiting notch and a second limiting notch, the shell is provided with an elastic lock pin, in the unlocking state, the elastic lock pin is inserted into the first limiting notch, in the password setting state, the elastic lock pin is inserted into the second limiting notch.

[0014] In order to make the components such as the wheel password assembly, the button assembly, the push piece, the output shaft and the push rod assembly be smoothly installed, preferably, the shell comprises an upper cover and a lower cover detachably installed at the bottom of the upper cover, the upper end of the output shaft is upwardly extended from the upper cover to form a switch knob, the lower end of the output shaft is downwardly extended from the lower cover, and the lock tongue is arranged below the lower cover and is installed at the lower end of the output shaft.

[0015] Compared with the prior art, the password lock has the advantages that: the password lock is provided with the wheel password assembly, the button assembly, the push piece and the output shaft on the shell, the outer periphery of the output shaft has the contact portions with different depths and in contact with the push piece, in the rotation process of the output shaft, the push piece can contact the contact portions with different depths and axially move relative to the wheel password assembly, so that the password lock is switched between the locked state, the unlocking state and the password setting state, and it can be seen that the state switching of the password lock can be realized only by rotating the output shaft, and the operation is simple and convenient, and in addition, the push rod assembly is also installed on the shell, when the manual zero operation of the password lock is needed, the push rod assembly only needs to be pushed, and the operation is very convenient. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the password lock of the utility model embodiment (locked state);

[0017] Figure 2 It is Figure 1 It is a structural schematic view of the password lock shown in the figure without the lower cover;

[0018] Figure 3 It is Figure 1 It is an exploded schematic view of the password lock shown in the figure;

[0019] Figure 4 It is Figure 1 A cross-sectional view of the structure of the password lock shown;

[0020] Figure 5 for Figure 1 A schematic diagram of the structure of the combination lock from another angle (with the lower cover and lock tongue removed);

[0021] Figure 6 for Figure 1 The schematic diagram of the structure of the password lock after removing the upper cover;

[0022] Figure 7 This is a schematic structural diagram of the output shaft of the combination lock according to an embodiment of the present utility model;

[0023] Figure 8 This is a schematic structural diagram of a wheel password assembly of a combination lock according to an embodiment of the present utility model;

[0024] Figure 9 for Figure 8 A partial exploded schematic diagram of the wheel cipher assembly shown;

[0025] Figure 10 This is a schematic diagram of the structure of a combination lock according to an embodiment of the present invention (unlocked state);

[0026] Figure 11 for Figure 10 The schematic diagram of the structure of the combination lock with the lower cover removed;

[0027] Figure 12 for Figure 10 A schematic diagram of the structure of the combination lock from another angle (with the lower cover and lock tongue removed);

[0028] Figure 13 This is a schematic diagram of the structure of a combination lock according to an embodiment of the present invention (unlocked state);

[0029] Figure 14 for Figure 13 The schematic diagram of the structure of the combination lock with the lower cover removed;

[0030] Figure 15 for Figure 13 The schematic diagram of the structure of the combination lock from another angle (removing the lower cover and lock tongue). DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0032] like Figures 1 to 5As shown, the combination lock of this embodiment includes a housing 1, on which are mounted components such as a wheel combination assembly 2, a button assembly 3, a toggle plate 4, an output shaft 5, a lock tongue 6, a push rod assembly 7, and an elastic lock pin 8. The housing 1 includes an upper cover 11 and a lower cover 12. The lower cover 12 is removably mounted to the bottom of the upper cover 11. The main body of the wheel combination assembly 2 and the output shaft 5 is located within the upper cover 11. The upper end of the output shaft 5 extends upward from the upper cover 11 to form a switch knob 58, while the lower end of the output shaft 5 extends downward from the lower cover 12. The lock tongue 6 is located below the lower cover 12 and mounted at the lower end of the output shaft 5. Rotating the switch knob 58 drives the lock tongue 6 to rotate synchronously, thereby unlocking and locking the lock. The button assembly 3 is used to toggle the combination wheel 23 of the wheel combination assembly 2, thereby inputting or setting a password.

[0033] The toggle plate 4 is located inside the upper cover 11, and one end of the toggle plate 4 always contacts the outer circumference of the output shaft 5. The outer circumference of the output shaft 5 has contact portions of different depths that contact the toggle plate 4. During the rotation of the output shaft 5, the toggle plate 4 can contact the contact portions of different depths and move axially relative to the wheel combination assembly 2, thereby switching the combination lock between the locked state, the unlocked state, and the password setting state. Figure 7 As shown, the outer circumferential surface of the output shaft 5 has a large arc surface 51 with a larger radius, a small arc surface 52 with a smaller radius, and a groove 53 extending inward from the large arc surface and connecting the large and small arc surfaces. The large arc surface 51, the small arc surface 52, and the groove 53 form a contact portion for the paddle 4. In the locked state, the end of the paddle 4 abuts against the small arc surface 52. In the unlocked state, the end of the paddle 4 abuts against the large arc surface 51. In the password setting state, the end of the paddle 4 extends into the groove 53.

[0034] like Figure 8 and Figure 9As shown, the combination lock has four wheel combination assemblies 2, allowing for a four-digit combination. Each wheel combination assembly 2 includes an axle 21, a sleeve 22, a combination wheel 23, a torsion spring 24, and a return spring 25. The sleeve 22 and combination wheel 23 are sleeved on the axle 21, the combination wheel 23 is further sleeved on the sleeve 22, and the torsion spring 24 is sleeved on the axle 21. The ends of the torsion spring 24 are respectively mounted on the housing 1 and the combination wheel 23, ensuring that the combination wheel 23 maintains a tendency to reset and clear after rotation. The return spring 25 is sleeved on the axle 21 and abuts against the combination wheel 23 and the sleeve 22, ensuring that the sleeve 22 always maintains a tendency to move outward. In this embodiment, the sleeve 22 is formed axially from the inside out with a sleeve body 220, a first boss 221, and a second boss 222. The outer diameter of the second boss 222 is larger than that of the first boss 221. Circumferentially spaced ribs 223 are formed on the outer circumferential wall of the first boss 221, and circumferentially spaced keyways 231 are formed on the inner circumferential wall of the code wheel 23. The ribs 223 and keyways 231 form a clutch mechanism. During operation, the paddle 4 drives the sleeve 22 toward the interior of the code wheel 23, causing the ribs 223 to engage with the corresponding keyways 231. At this point, the clutch mechanism is engaged, and the sleeve 22 and code wheel 23 rotate synchronously. The return spring 25 drives the sleeve 22 toward the exterior of the code wheel 23, disengaging the ribs 223 from the corresponding keyways 231. At this point, the clutch mechanism is disengaged, allowing the code wheel 23 to rotate relative to the sleeve 22 to set the code.

[0035] In addition, the second boss 222 of the sleeve 22 is circumferentially defined with notches 224, with each sleeve 22 having one notch 224. The paddle 4 has a protrusion 41 that mates with the corresponding notch. When the clutch mechanism is engaged, the sleeve 22 and the code wheel 23 rotate synchronously, causing the position of the notches 224 to move circumferentially. However, the paddle 4 can only move axially and cannot rotate circumferentially. Therefore, when the sleeve 22 rotates until the notches 224 are aligned with the protrusion 41, the paddle 4, driven by the output shaft 5, can move inward relative to the sleeve 22 and insert into the notch 224.

[0036] like Figure 6As shown, a stop block 55 is protruding from the outer wall of the output shaft 5, and a first stop wall 121 and a second stop wall 122 are formed inside the housing 1. In the locked state, the output shaft 5 rotates until the stop block 55 abuts against the first stop wall 121, causing the lock tongue 6 to be in the 0° position; in the password setting state, the output shaft 5 rotates until the stop block 55 abuts against the second stop wall 122, causing the lock tongue 6 to be in the 180° position; in the unlocked state, the lock tongue 6 is in the 90° position. In addition, a first stop notch 56 and a second stop notch 57 are formed on the outer wall of the output shaft 5, and an elastic lock pin 8 is installed inside the upper cover 11. In the unlocked state, the elastic lock pin 8 is inserted into the first stop notch 56, and in the password setting state, the elastic lock pin 8 is inserted into the second stop notch 57. The elastic lock pin 8 acts as an elastic limiter for the output shaft 5.

[0037] The push rod assembly 7 of this embodiment is installed inside the upper cover 11. The push rod assembly 7 includes a push rod body 71, a compression spring 72, a spring paddle 73, and a movable block 74. The push rod assembly 7 has an operating portion 75 extending outside the upper cover 11. The inner side of the push rod body 71 is provided with a block 711 that cooperates with the code wheel 23. The block 711 can be fixed on the code wheel 23 to prevent the code wheel 23 from rotating. When the block 711 is disengaged from the code wheel 23, the code wheel 23 can rotate relative to the housing 1 to reset and clear. The compression spring 72 is provided between the end of the push rod body 71 and the housing 1. The elastic force generated by the compression spring 72 on the push rod body 71 causes the block 711 to maintain a tendency to be fixed on the code wheel 23. When the combination needs to be manually reset, the operating portion 75 is pushed toward the switch knob 58. The push rod body 71 moves synchronously, and the block 711 disengages from the combination wheel 23. Under the action of the torsion spring 24, the combination is reset. At this time, the push rod body 71 presses the compression spring 72, further compressing the compression spring 72. Release the operating portion 75, and the push rod body 71 returns to its original position under the action of the compression spring 72, and the block 711 is re-engaged on the combination wheel 23.

[0038] The push rod body 71 has a mounting slot 712 on the side facing the output shaft 5. An elastic paddle 73 and a movable stopper 74 are mounted within the mounting slot 712. The elastic paddle 73 acts on the movable stopper 74, causing it to move outward. The movable stopper 74 has a guide ramp 741 that mates with the upper cover 11, facilitating smooth movement of the push rod body 71 and the movable stopper 74 toward the compression spring 72 when the operating portion 75 is pushed. A top block 54 is protruding from the outer peripheral wall of the output shaft 5. When the output shaft 5 rotates until the top block 54 abuts the movable stopper 74, the top block 54 drives the movable stopper 74 toward the interior of the mounting slot 712, compressing the elastic paddle 73. The movable stopper 74 then drives the push rod body 71 toward the compression spring 72, disengaging the block 711 from the combination wheel 23 and achieving automatic reset of the combination.

[0039] The working principle of this combination lock is as follows:

[0040] like Figures 1 to 9 As shown, the combination lock is in the locked state, with the lock tongue 6 at the 0° position, the toggle plate 4 abutting against the small arc surface 52, and the sleeve 22 of the combination wheel assembly 2 engaged with the combination wheel 23. To unlock, the button assembly 3 is pressed. Each time the button assembly 3 is pressed, the sleeve 22 and combination wheel 23 rotate synchronously by one wheel digit. When the correct combination is entered, the notches 224 of the four sleeves 22 are all aligned in a straight line and aligned with the corresponding protrusions 41 of the toggle plate 4. At this point, the output shaft 5 can rotate smoothly to unlock the lock.

[0041] like Figures 10 to 12 As shown, the combination lock is in the unlocked state, the lock tongue 6 is at the 90° position, the toggle piece 4 is against the large arc surface 51, and driven by the toggle rod 4, the entire sleeve 22 is pushed inward into the interior of the combination wheel 23, and the sleeve 22 and the combination wheel 23 are still in the engaged state.

[0042] like Figures 13 to 15 As shown, the combination lock is in the combination setting state, the lock tongue 6 is in the 180° position, the toggle piece 4 is inserted into the groove 53, and under the action of the reset spring 25, the sleeve 22 moves outward to the maximum distance relative to the combination wheel 23, so that the rib 223 of the sleeve 22 is disengaged from the keyway 231 of the combination wheel 23, that is, the clutch structure is in the disengaged state. At this time, the four notches 224 of the sleeve 22 are still located on the same straight line, and the protrusions 41 are still located in the corresponding notches 224. When the user presses the button assembly 3, the combination wheel 23 rotates, and the sleeve 22 does not rotate. After the password is set, the output shaft 5 is rotated in the opposite direction, that is, the output shaft 5 is rotated in the opposite direction from the current 180° position to the initial position of 0°. When the output shaft 5 rotates in the opposite direction until the top block 54 abuts the movable stopper 74, the paddle 4 has abutted against the small arc surface 52, and the sleeve 22 has moved inward relative to the password wheel 23. That is, the rib 223 is engaged in the keyway 231, and the sleeve 22 can rotate synchronously with the password wheel 23. As the output shaft 5 rotates further in the opposite direction, the top block 54 drives the movable stopper 74 to move into the mounting groove 712, thereby compressing the elastic paddle 73. The movable stopper 74 drives the push rod body 71 to move in the direction of the compression spring 72, thereby disengaging the block 711 from the password wheel 23. Once the block 711 disengages the password wheel 23, the torsion spring 24 acts to reset the password wheel 23, achieving automatic clearing of the password. As the password is automatically cleared, the notch 224 of the sleeve 22 rotates synchronously to be offset from the protrusion 41 corresponding to the toggle rod 4. At this time, the password lock returns to the locked state and is unlocked when the correct password is entered next time.

[0043] In addition, in addition to realizing automatic clearing of the password during the reversal of the output shaft 5, manual clearing of the password can also be realized by pushing the operating portion 75 of the push rod assembly 7. The operating principle has been described in detail above and will not be described again here.

[0044] In the specification and claims of the present invention, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A combination lock, comprising a housing (1), a wheel combination assembly (2), a button assembly (3), a toggle plate (4) and an output shaft (5) mounted on the housing (1), wherein the button assembly (3) is used to toggle the combination wheel (23) of the wheel combination assembly (2) to rotate, and a lock tongue (6) is mounted on the output end of the output shaft (5) to rotate synchronously with the output shaft (5), characterized in that: One end of the toggle plate (4) always contacts the outer peripheral surface of the output shaft (5), and the outer peripheral surface of the output shaft (5) has contact portions of different depths that contact the toggle plate (4). During the rotation of the output shaft (5), the toggle plate (4) can contact the contact portions of different depths and move axially relative to the character wheel password assembly (2), thereby switching the password lock between a locked state, an unlocked state, and a password setting state.

2. The combination lock according to claim 1, characterized in that: The outer peripheral surface of the output shaft (5) has a large arc surface (51) with a larger radius, a small arc surface (52) with a smaller radius, and a groove (53) connected between the large arc surface and the small arc surface and further extending inward from the small arc surface. In a locked state, the end of the toggle piece (4) abuts against the small arc surface (52). In an unlocked state, the end of the toggle piece (4) abuts against the large arc surface (51). In a password setting state, the end of the toggle piece (4) extends into the groove (53).

3. The combination lock according to claim 1, characterized in that: The word wheel password assembly (2) comprises a wheel shaft (21), a shaft sleeve (22), a password wheel (23), a torsion spring (24) and a reset spring (25); the shaft sleeve (22) and the password wheel (23) are sleeved on the wheel shaft (21); the password wheel (23) is also sleeved on the shaft sleeve (22); a clutch structure is provided between the password wheel (23) and the shaft sleeve (22); the torsion spring (24) is sleeved on the wheel shaft (21); both ends of the torsion spring (24) are The reset spring (25) is respectively mounted on the housing (1) and the code wheel (23) so that the code wheel (23) maintains a tendency to reset after rotation. The reset spring (25) is sleeved on the wheel shaft (21) and abuts against the code wheel (23) and the shaft sleeve (22), so that the shaft sleeve (22) always maintains a tendency to move outward to separate the clutch structure. When the clutch structure is separated, the code wheel (23) can rotate relative to the shaft sleeve (22) to set the code.

4. The combination lock according to claim 3, characterized in that: The clutch structure comprises a convex rib (223) convexly arranged on the outer peripheral wall of the shaft sleeve (22) and a key groove (231) formed on the inner peripheral wall of the password wheel (23), wherein the convex rib (223) is arranged along the circumference of the shaft sleeve (22), and the key groove (231) is arranged along the circumference of the password wheel (23), and the paddle (4) can drive the shaft sleeve (22) to move toward the inside of the password wheel (23) so that the convex rib (223) is engaged in the corresponding key groove (231). ), the reset spring (25) can drive the sleeve (22) to move toward the outside of the code wheel (23) so that the rib (223) is disengaged from the corresponding key slot (231); when the rib (223) is engaged in the key slot (231), the sleeve (22) and the code wheel (23) rotate synchronously; when the rib (223) is disengaged from the key slot (231), the code wheel (23) can rotate relative to the sleeve (22).

5. The combination lock according to claim 4, characterized in that: The sleeve (22) is formed with a sleeve body (220), a first boss (221) and a second boss (222) in sequence from the inside to the outside along the axial direction. The outer diameter of the second boss (222) is larger than the outer diameter of the first boss (221). The ribs (223) are circumferentially spaced and distributed on the outer wall of the first boss (221). A notch (224) is opened in the circumferential direction of the second boss (222). The shifting piece (4) has a convex block (41) that matches the notch. The convex block (41) can be inserted into the notch (224) under the drive of the output shaft when it is aligned with the corresponding notch (224).

6. The combination lock according to claim 1, characterized in that: A push rod assembly (7) is also mounted on the housing (1). The push rod assembly (7) has a clamping block (711) that matches the password wheel (23). The clamping block (711) can be clamped on the password wheel (23) to prevent the password wheel (23) from rotating. When the clamping block (711) is disengaged from the password wheel (23), the password wheel (23) can rotate relative to the housing (1) to set or reset the password.

7. The combination lock according to claim 6, characterized in that: The push rod assembly (7) includes a push rod body (71) and a compression spring (72). The push rod body (71) is installed on the housing (1). The clamping block (711) is arranged on the side of the push rod body (71). The compression spring (72) is arranged between the end of the push rod body (71) and the housing (1). The elastic force generated by the compression spring (72) on the push rod body (71) makes the clamping block (711) tend to be clamped on the password wheel (23). External force drives the push rod assembly (7) to move and compress the compression spring (72), so that the clamping block (711) is separated from the password wheel (23).

8. The combination lock according to claim 7, characterized in that: The push rod body (71) is provided with a mounting groove (712) on one side facing the output shaft (5), and an elastic paddle (73) and a movable stopper (74) are installed in the mounting groove (712). The elastic paddle (73) acts on the movable stopper (74) so ​​that the movable stopper (74) has a tendency to move outward. A top block (54) is convexly provided on the outer peripheral wall of the output shaft (5). When the output shaft (5) rotates until the top block (54) abuts against the movable stopper (74), the top block (54) drives the movable stopper (74) to move into the mounting groove (712) to press the elastic paddle (73), and drives the push rod body (71) to move in the direction of the compression spring (72) through the movable stopper (74), so that the block (711) is separated from the password wheel (23).

9. The combination lock according to claim 1, characterized in that: A limiting block (55) is convexly provided on the outer peripheral wall of the output shaft (5), and a first limiting wall (121) and a second limiting wall (122) are formed inside the housing (1). In a locked state, the output shaft (5) rotates until the limiting block (55) abuts against the first limiting wall (121), so that the lock tongue (6) is in a 0° position. In a password setting state, the output shaft (5) rotates until the limiting block (55) abuts against the second limiting wall (122), so that the lock tongue (6) is in a 180° position. In an unlocked state, the lock tongue (6) is in a 90° position. A first limiting notch (56) and a second limiting notch (57) are provided on the outer peripheral wall of the output shaft (5). An elastic lock pin (8) is provided on the housing (1). In the unlocked state, the elastic lock pin (8) is inserted into the first limiting notch (56), and in the password setting state, the elastic lock pin (8) is inserted into the second limiting notch (57).

10. The combination lock according to any one of claims 1 to 9, characterized in that: The housing (1) comprises an upper cover (11) and a lower cover (12) detachably mounted on the bottom of the upper cover (11); the upper end of the output shaft (5) extends upward from the upper cover (11) to form a switch knob (58); the lower end of the output shaft (5) extends downward from the lower cover (12); and the lock tongue (6) is arranged below the lower cover (12) and mounted on the lower end of the output shaft (5).

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