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 present invention relates to the technical field of locks, in particular to a combination lock. Background Art

[0002] The issue of property and information security has always been a problem that all walks of life attach great importance to, so the application of locks is everywhere. Traditional locks require carrying keys with you, which brings a lot of inconvenience and even trouble. However, password locks are loved and used by more and more people because they do not require keys. Common password locks usually include digital key password locks and dial password locks. For example, the password lock disclosed in the Chinese utility model patent with patent number 202021447239.0 (authorized public number CN 213683572 U) includes a 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 assembly mounted on the body; the unlocking assembly includes an unlocking member mounted on the 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 body and connected to the transmission plate to drive the transmission plate to move; the unlocking member is provided with an anti-bias groove; the transmission plate is provided with an anti-bias portion used in conjunction with the anti-bias groove to prevent the transmission plate from deflecting. The combination lock drives the transmission plate to move by moving the slide, thereby driving the unlocking member to move synchronously, so that the unlocking member releases the pressing effect on the locking member. In order to ensure the transmission stability of the transmission plate and the unlocking member, the mechanical combination lock also needs to be used with an anti-bias part and an anti-bias groove, and the structure is relatively complex. In addition, the combination lock does not have a manual clearing structure for the public password. In summary, the existing combination lock structure needs to be further improved. Summary of the invention

[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 view of 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 plate 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 installed with a lock tongue that rotates synchronously with the output shaft, characterized in that: one end of the toggle plate is always in contact with the outer peripheral surface of the output shaft, the outer peripheral surface of the output shaft has contact parts with different depths and in contact with the toggle plate, and during the rotation of the output shaft, the toggle plate can contact the contact parts with 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 connecting the large arc surface and the small arc surface and further deepening inward from the small arc surface. In the locked state, the end of the toggle piece abuts against the small arc surface, in the unlocked state, the end of the toggle piece abuts against the large arc surface, and in the password setting state, the end of the toggle piece extends into the groove.

[0006] The word wheel password assembly can have a variety of structures. Preferably, the word wheel password assembly includes a wheel shaft, a sleeve, a password wheel, a torsion spring and a reset spring. The sleeve and the password wheel are sleeved on the wheel shaft, and the password wheel is also sleeved on the sleeve. A clutch structure is provided between the password wheel and the sleeve. The torsion spring is sleeved on the wheel shaft. The two ends of the torsion spring are respectively installed on the housing and the password wheel so that the password wheel after rotation maintains a tendency to reset. The reset spring is sleeved on the wheel shaft and abuts against the password wheel and the sleeve. The sleeve always maintains a tendency to move outward to separate the clutch structure. In the state where the clutch structure is separated, the password wheel can rotate relative to the sleeve to set the password. With such a configuration, 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 can be multiple clutch structures. Preferably, the clutch structure includes a convex rib convexly arranged on the outer peripheral wall of the sleeve and a key slot formed on the inner peripheral wall of the code wheel. The convex rib is arranged along the circumference of the sleeve, and the key slot is arranged along the circumference of the code wheel. The toggle piece can drive the sleeve to move toward the inside of the code wheel so that the convex rib is inserted into the corresponding key slot. The reset spring can drive the sleeve to move toward the outside of the code wheel so that the convex rib is separated from the corresponding key slot. When the convex rib is inserted into the key slot, the sleeve and the code wheel keep rotating synchronously. When the convex rib is separated from the key slot, the code wheel can rotate relative to the sleeve. In this way, the sleeve and the code wheel can rotate synchronously or the code wheel can rotate relative to the sleeve through the cooperation of the convex rib and the key slot. When the convex rib is separated from the key slot, the code wheel can rotate relative to the sleeve. At this time, the password can be set or the code wheel can be reset after the password is set. When the convex rib is inserted into the key slot, the code wheel and the sleeve can only rotate at the same time, and the password can be input.

[0008] Further preferably, the sleeve is formed with a sleeve body, a first boss and a second boss in sequence from the inside to the outside along the axial direction, the outer diameter of the second boss is larger than the outer diameter of the first boss, the ribs are circumferentially spaced and distributed on the outer peripheral wall of the first boss, a notch is formed in the circumferential direction of the second boss, the toggle plate has a convex block that matches the notch, and the convex block can be inserted into the notch under the drive of the output shaft when it is aligned with the corresponding notch. With such a configuration, after the correct password is entered in the locked state, the sleeve and the password wheel rotate synchronously to a position where the notch is aligned with the convex block, and the toggle rod can insert the convex block into the corresponding notch under the drive of the output shaft to unlock.

[0009] In order to manually reset the password wheel, a push rod assembly is also installed on the shell. The push rod assembly has a card block that cooperates with the password wheel. The card block can be stuck on the password wheel to prevent the password wheel from rotating. When the card block is disengaged from the password wheel, the password wheel can rotate relative to the shell to set the password or reset it.

[0010] The push rod assembly can have a variety of structures. Preferably, the push rod assembly includes a push rod body and a compression spring. The push rod body is installed on the housing. The card block is arranged on the side of the push rod body. The compression spring is arranged between the end of the push rod body and the housing. The elastic force generated by the compression spring on the push rod body keeps the card block in a tendency to be stuck on the password wheel. The push rod assembly is driven by an external force to move and compress the compression spring to separate the card block from the password wheel. In this way, when the card block is stuck on the password wheel, the password wheel can rotate under the pressure of the button assembly, but the password wheel cannot be reset after rotation. After the push rod assembly is driven by an external force to move and separate the card block from the password wheel, the password wheel is reset immediately after rotation.

[0011] In order to reset the code wheel during the rotation of the output shaft, the push rod body is provided with a mounting groove on the side facing the output shaft, and an elastic paddle and a movable stopper are installed in the mounting groove. The elastic paddle acts on the movable stopper so that the movable stopper has a tendency to move outward, and a top block is protruding on the outer peripheral wall of the output shaft. When the output shaft rotates until the top block and the movable stopper abut against each other, the top block drives the movable stopper to move into the mounting groove to press the elastic paddle, and the movable stopper drives the push rod body to move in the direction of the compression spring to disengage the blocking block from the code wheel.

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

[0013] In order to limit the output shaft in the unlocked state and the password-set state, a first limiting notch and a second limiting notch are opened on the outer peripheral wall of the output shaft, and an elastic locking pin is arranged on the shell. In the unlocked state, the elastic locking pin is inserted into the first limiting notch, and in the password-set state, the elastic locking pin is inserted into the second limiting notch.

[0014] In order to enable the smooth installation of components such as the wheel password assembly, button assembly, toggle plate, output shaft, push rod assembly, etc., preferably, the shell includes an upper cover and a lower cover detachably mounted on the bottom of the upper cover, the upper end of the output shaft extends upward from the upper cover to form a switch knob, the lower end of the output shaft extends downward from the lower cover, and the lock tongue is arranged under the lower cover and mounted on the lower end of the output shaft.

[0015] Compared with the prior art, the advantages of the present invention are: the combination lock is equipped with a wheel password assembly, a button assembly, a toggle plate and an output shaft on the shell. Since the outer peripheral surface of the output shaft has contact portions of different depths in contact with the toggle plate, during the rotation of the output shaft, the toggle plate can contact the contact portions of different depths and move axially relative to the wheel password assembly, thereby switching the combination lock between a locked state, an unlocked state and a password setting state. It can be seen that the state switching of the combination lock can be achieved by only rotating the output shaft, and the operation is simple and convenient. In addition, a push rod assembly is also installed on the shell. When the combination lock needs to be manually cleared, only the push rod assembly needs to be pushed, and the operation is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the password lock of the embodiment of the present invention (locked state);

[0017] Figure 2 for Figure 1 The schematic diagram of the structure of the password lock with the lower cover removed;

[0018] Figure 3 for Figure 1 An exploded schematic diagram of the combination lock shown;

[0019] Figure 4 for Figure 1A 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 (without the lower cover and the lock tongue);

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

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

[0023] Figure 8 It is a structural schematic diagram of a word wheel password component of a password lock according to an embodiment of the present invention;

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

[0025] Fig.10 Schematic diagram of the structure of the password lock of the embodiment of the present invention (unlocked state);

[0026] Fig.11 for Fig.10 The schematic diagram of the structure of the password lock with the lower cover removed;

[0027] Fig.12 for Fig.10 A schematic diagram of the structure of the combination lock from another angle (without the lower cover and the lock tongue);

[0028] Fig.13 Schematic diagram of the structure of the password lock of the embodiment of the present invention (unlocked state);

[0029] Fig.14 for Fig.13 The schematic diagram of the structure of the password lock with the lower cover removed;

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

[0031] The present invention is further described in detail below with reference to the accompanying drawings.

[0032] like Figures 1 to 5As shown, the password lock of this embodiment includes a housing 1, on which components such as a wheel password component 2, a button component 3, a toggle plate 4, an output shaft 5, a lock tongue 6, a push rod component 7 and an elastic lock pin 8 are installed. Among them, the housing 1 includes an upper cover 11 and a lower cover 12, and the lower cover 12 is detachably installed at the bottom of the upper cover 11. The main body of the wheel password component 2 and the output shaft 5 is arranged inside the upper cover 11, and the upper end of the output shaft 5 extends upward from the upper cover 11 to form a switch knob 58, and the lower end of the output shaft 5 extends downward from the lower cover 12. The lock tongue 6 is arranged below the lower cover 12 and installed at the lower end of the output shaft 5. By rotating the switch knob 58, the lock tongue 6 is driven to rotate synchronously, thereby realizing unlocking and locking. The button component 3 is used to toggle the password wheel 23 of the wheel password component 2 to rotate, thereby inputting a password or setting a password.

[0033] The toggle plate 4 is arranged 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 word wheel password 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 connected between the large arc surface and the small arc surface and further inward from the small arc surface. The large arc surface 51, the small arc surface 52 and the groove 53 constitute a contact portion that matches with the toggle piece 4. In the locked state, the end of the toggle piece 4 abuts against the small arc surface 52, in the unlocked state, the end of the toggle piece 4 abuts against the large arc surface 51, and in the password setting state, the end of the toggle piece 4 extends into the groove 53.

[0034] like Figure 8 and Fig. 9As shown, the word wheel password assembly 2 of the password lock has four groups, that is, a four-digit password can be set. Each group of word wheel password assembly 2 includes a wheel shaft 21, a sleeve 22, a password wheel 23, a torsion spring 24 and a reset spring 25, wherein the sleeve 22 and the password wheel 23 are sleeved on the wheel shaft 21, the password wheel 23 is also sleeved on the sleeve 22, the torsion spring 24 is sleeved on the wheel shaft 21, and the two ends of the torsion spring 24 are respectively installed on the housing 1 and the password wheel 23 so that the password wheel 23 after rotation maintains a tendency to reset and clear, and the reset spring 25 is sleeved on the wheel shaft 21 and abuts against the password wheel 23 and the sleeve 22, so that the sleeve 22 always maintains a tendency to move outward. The sleeve 22 of this embodiment 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, and the outer diameter of the second boss 222 is larger than the outer diameter of the first boss 221. The outer peripheral wall of the first boss 221 is formed with convex ribs 223 distributed at intervals in the circumferential direction, and the inner peripheral wall of the code wheel 23 is formed with key slots 231 distributed at intervals in the circumferential direction. The convex ribs 223 and the key slots 231 constitute a clutch structure. During operation, the toggle plate 4 can drive the sleeve 22 to move toward the inside of the code wheel 23 so that the convex ribs 223 are inserted into the corresponding key slots 231. At this time, the clutch structure is in an engaged state, and the sleeve 22 and the code wheel 23 rotate synchronously. The reset spring 25 can drive the sleeve 22 to move toward the outside of the code wheel 23 so that the convex ribs 223 are disengaged from the corresponding key slots 231. At this time, the clutch structure is in a disengaged state, and the code wheel 23 can rotate relative to the sleeve 22 to set the code.

[0035] In addition, the second boss 222 of the sleeve 22 is provided with a notch 224 in the circumferential direction, each sleeve 22 has one notch 224, and the toggle plate 4 has a protrusion 41 that matches the corresponding notch. When the clutch structure is engaged, the sleeve 22 and the code wheel 23 rotate synchronously, that is, the position of the notch 224 also moves synchronously in the circumferential direction, and the toggle plate 4 can only move axially but cannot rotate circumferentially. Therefore, when the sleeve 22 rotates to the state where the notch 224 is aligned with the protrusion 41, the toggle plate 4 can move inward relative to the sleeve 22 under the drive of the output shaft 5, and then be inserted into the notch 224.

[0036] like Figure 6As shown, a limit block 55 is convexly provided on the outer peripheral wall of the output shaft 5, and a first limit wall 121 and a second limit wall 122 are formed inside the housing 1. In the locked state, the output shaft 5 rotates until the limit block 55 abuts against the first limit wall 121, so that the lock tongue 6 is in the 0° position; in the password setting state, the output shaft 5 rotates until the limit block 55 abuts against the second limit wall 122, so that the lock tongue 6 is in the 180° position; in the unlocked state, the lock tongue 6 is in the 90° position. In addition, a first limit notch 56 and a second limit notch 57 are also formed on the outer peripheral 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 limit notch 56, and in the password setting state, the elastic lock pin 8 is inserted into the second limit notch 57. The elastic lock pin 8 plays an elastic limiting role on 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, a movable stopper 74 and other components. 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 matches the code wheel 23. The block 711 can be stuck on the code wheel 23 to prevent the code wheel 23 from rotating. When the block 711 is separated 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 keeps the block 711 stuck on the code wheel 23. When the password needs to be manually cleared, the operating part 75 is pushed toward the switch knob 58, the push rod body 71 moves synchronously, the block 711 is separated from the password wheel 23, and the password is cleared under the action of the torsion spring 24. At this time, the push rod body 71 presses the compression spring 72, and the compression spring 72 is further compressed. Release the operating part 75, the push rod body 71 is reset under the action of the compression spring 72, and the block 711 is re-set on the password wheel 23.

[0038] The push rod body 71 has a mounting groove 712 on one side facing the output shaft 5, and the elastic paddle 73 and the movable stopper 74 are mounted in the mounting groove 712. The elastic paddle 73 acts on the movable stopper 74 to make the movable stopper 74 have a tendency to move outward. The movable stopper 74 has a guide inclined surface 741 that cooperates with the upper cover 11, so that when the operating part 75 is pushed, the push rod body 71 and the movable stopper 74 can smoothly move in the direction of the compression spring 72. 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 to disengage the block 711 from the password wheel 23, so that the password is automatically cleared.

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

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

[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 plate 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 password 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 password wheel 23, so that the rib 223 of the sleeve 22 is disengaged from the key slot 231 of the password wheel 23, that is, the clutch structure is in a separated 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 arranged in the corresponding notches 224. When the user presses the button assembly 3, the password wheel 23 rotates, and the sleeve 22 does not rotate. After the password is set, the output shaft 5 is rotated in the reverse direction, that is, the output shaft 5 is rotated in the reverse direction from the current 180° position to the 0° initial position. When the output shaft 5 is rotated in the reverse direction until the top block 54 abuts against the movable block 74, the toggle piece 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 has been inserted into the key slot 231, and the sleeve 22 can rotate synchronously with the password wheel 23. As the output shaft 5 further rotates in the reverse direction, the top block 54 drives the movable block 74 to move inside the installation slot 712 to press the elastic paddle 73, and the movable block 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 is disengaged from the password wheel 23, the password wheel 23 is reset immediately under the action of the torsion spring 24, and the password is automatically cleared. 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, and the combination 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 of which has been described in detail above and will not be described again here.

[0044] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. 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), on which a wheel combination assembly (2), a button assembly (3), a toggle plate (4) and an output shaft (5) are mounted, wherein the button assembly (3) is used to toggle a combination wheel (23) of the wheel combination assembly (2) to rotate, and a lock tongue (6) is mounted at 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) is always in contact with the outer peripheral surface of the output shaft (5); the outer peripheral surface of the output shaft (5) has contact portions of different depths in contact with 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 combination 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 extending further 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 cipher assembly (2) comprises a wheel shaft (21), a shaft sleeve (22), a cipher wheel (23), a torsion spring (24) and a reset spring (25); the shaft sleeve (22) and the cipher wheel (23) are sleeved on the wheel shaft (21); the cipher wheel (23) is also sleeved on the shaft sleeve (22); a clutch structure is provided between the cipher 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 outwards so that the clutch structure is separated. 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 code wheel (23); the convex rib (223) is arranged along the circumference of the shaft sleeve (22); the key groove (231) is arranged along the circumference of the code wheel (23); the shifting piece (4) can drive the shaft sleeve (22) to move toward the inside of the code wheel (23) so that the convex rib (223) is inserted into the corresponding key groove (231). ), the reset spring (25) can drive the shaft sleeve (22) to move toward the outside of the code wheel (23) so that the convex rib (223) is disengaged from the corresponding key slot (231); when the convex rib (223) is inserted into the key slot (231), the shaft sleeve (22) and the code wheel (23) rotate synchronously; when the convex rib (223) is disengaged from the key slot (231), the code wheel (23) can rotate relative to the shaft sleeve (22).

5. The combination lock according to claim 4, characterized in that: The shaft sleeve (22) is formed with a shaft 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 peripheral wall of the first boss (221). A notch (224) is circumferentially formed on the second boss (222). The shifting plate (4) has a convex block (41) matched with the notch. The convex block (41) can be inserted into the notch (224) under the drive of the output shaft when 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 code wheel (23). The clamping block (711) can be clamped on the code wheel (23) to prevent the code wheel (23) from rotating. When the clamping block (711) is disengaged from the code wheel (23), the code wheel (23) can rotate relative to the housing (1) to set a code or reset it.

7. The combination lock according to claim 6, characterized in that: The push rod assembly (7) comprises a push rod body (71) and a compression spring (72); the push rod body (71) is mounted on a housing (1); the clamping block (711) is arranged on a side of the push rod body (71); the compression spring (72) is arranged between an 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 clamping block (711) to maintain a tendency to be clamped on the code wheel (23); an 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 code 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 outwards. 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 code 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); 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 at 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 at a 180° position; in an unlocked state, the lock tongue (6) is at a 90° position; a first limiting notch (56) and a second limiting notch (57) are formed on the outer peripheral wall of the output shaft (5); an elastic lock pin (8) is provided on the housing (1); in an unlocked state, the elastic lock pin (8) is inserted into the first limiting notch (56); in a 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 locking tongue (6) is arranged below the lower cover (12) and mounted on the lower end of the output shaft (5).

Images