Password lock

Abstract

The utility model discloses a password lock, including the lock body, the lock beam is matched and is arranged at the top end of lock body, and the upper end is arranged with the installation cavity in the lock body, is arranged with the support in the installation cavity, and is arranged with the password component between the front end of installation cavity and support, is arranged with the locking structure between the support and the top of installation cavity, the utility model discloses password lock sets up the middle axle in the installation cavity in the lock body, and the axle body bottom of middle axle is provided with a plurality of downward protruding lock catch, is provided with a plurality of inner rotor on the axle body, and the inner wall on the left end of inner rotor is abutted to lock catch, and the inner wall on the right end of inner rotor is provided with the radially inward extending protruding piece, is provided with the sliding slot on the protruding piece along the inner rotor axial direction, and the outer side of inner rotor is provided with the character code wheel, and the rotation character code wheel can drive inner rotor, when the password is correct, and the lock catch is opposite to the sliding slot of all inner rotors, therefore can drive the middle axle, thereby can open the lock body, and the end of middle axle is also provided with the change code component, and the structure of change code component and password component in the lock body is simple, and the simple assembling can save the cost.

Description

Technical Field

[0001] This utility model relates to a combination lock. Background Technology

[0002] Locks, as common items in daily life, are devices that serve a sealing function, generally consisting of a lock body, lock beam, combination lock components, and key-changing components. There are many types of locks. Combination locks, which do not require keys to unlock and are convenient to use, are widely favored by consumers. However, current combination locks suffer from complex structures in their internal combination lock components and key-changing components, making assembly cumbersome and costly. Furthermore, mechanical combination locks have limited functionality, only providing locking and unlocking functions. Currently, some solutions on the market attempt to combine storage functions with locks, but most of these solutions result in even more complex lock bodies. Utility Model Content

[0003] This utility model provides a combination lock.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0005] A combination lock includes a lock body, a lock beam fitted at the top of the lock body, a mounting cavity at the upper end of the lock body containing a bracket, and a combination component positioned between the front end of the mounting cavity and the bracket. A locking structure is provided between the bracket and the top of the mounting cavity. The locking structure includes a bolt mounted at the top of the mounting cavity, which engages with the bottom of the lock beam. The right end of the bolt has a vertically downward-extending folded edge. A lock button is positioned on the outer side of the folded edge. The combination component includes a central shaft, an inner rotor, a character wheel, and a... The central shaft includes a boss and a shaft body. The boss is located at the right end of the lock body and abuts against the folded edge. The bottom of the shaft body of the central shaft is provided with multiple evenly spaced and downwardly protruding latches. Multiple inner rotors are sleeved on the outer wall of the shaft body. The latches abut against the inner wall of the left end of the inner rotors. The inner wall of the right end of the inner rotors is provided with radially inwardly extending protrusions. The protrusions are provided with sliding grooves along the axial direction of the inner rotors. The code wheel is sleeved on the outside of the inner rotors. The central shaft spring is sleeved on the shaft body between the inner rotors and the boss.

[0006] Preferably, the opening of the mounting cavity is located at the rear end of the lock body, and the lock beam passes through the lock beam holes on the left and right sides of the top of the lock body and engages with the interior of the lock body; both ends of the lock beam are provided with annular grooves; the latch includes two first through holes and second through holes that engage with the bottom of the lock beam, the first through holes and second through holes are respectively opposite to the lock beam holes on the left and right sides of the top of the lock body, the left ends of the first through holes and second through holes are respectively provided with a first arc-shaped groove and a second arc-shaped groove extending radially, the front end of the latch is provided with a first groove in the middle, the first groove engages with a first platform at the top of the interior of the mounting cavity, the first platform is L-shaped, a latch return spring is provided at the first platform, one end of the latch return spring abuts against the vertical inner wall of the first platform, and the other end abuts against the latch.

[0007] Preferably, the outer side of the inner rotor is provided with a fixed tooth extending axially to the rear end; the inner ring of the code wheel is provided with a radially arranged annular protrusion that mates with the outer wall of the inner rotor, and the annular protrusion is provided with a slot that mates with the fixed tooth; the bottom of the sliding groove of the inner rotor is at the same height as the inner wall of the front end of the inner rotor; the front end of the protrusion of the inner rotor is provided with multiple trap grooves; the upper front side of the lock body is provided with a mounting groove that mates with the code wheel, the mounting groove is connected to the mounting cavity, and the front end of the code wheel passes through the mounting groove and protrudes from the outer side of the lock body; a washer is fixedly provided on the right side of the inner rotor, and one end of the central shaft spring abuts against the inner side wall of the boss; the number of latches is four, and the number of inner rotors is four.

[0008] Preferably, the outer rear end of the boss is fitted with an extension plate that extends vertically, and the extension plate abuts against the inner side of the folded edge; the folded edge is connected to the second through hole; the lock button passes through the lock body, with its inner end cooperating with the folded edge and its outer end exposed on the outside of the lock body.

[0009] Preferably, a second groove is provided between adjacent characters of the character wheel, and several positioning pieces are provided at the bottom of the bracket opposite to the character wheel, with the top of the positioning pieces cooperating with the second groove of the character wheel.

[0010] Preferably, a code-changing assembly is sleeved on the outer side of the end of the central shaft, and the code-changing assembly is also disposed between the mounting cavity and the bracket; the code-changing assembly includes an outer code-changing wheel and an inner code-changing wheel that cooperate with each other, and the inner code-changing wheel is sleeved on the end of the central shaft; the inner side of the outer code-changing wheel is a spiral upward ramp that rotates around the center, and the surface of the inner code-changing wheel that contacts the outer code-changing wheel has a centrally symmetrical structure. Viewed from the left end to the right end of the lock body, the ramp on the side of the outer code-changing wheel spirals upward in a counterclockwise direction with the highest top slope, and the ramp on the side of the inner code-changing wheel spirals upward in a clockwise direction with the lowest top slope.

[0011] Preferably, the outer wall of the outer code-changing wheel is provided with a first limiting block protruding outward, and the outer wall of the inner code-changing wheel is also provided with a second limiting block protruding outward. The first limiting block is engaged in the guide groove of the bracket, and the second limiting block abuts against the front side wall of the bracket; the outer side of the outer code-changing wheel is exposed on the outer side of the lock body.

[0012] Preferably, a rear cover is fixedly fitted to the rear end of the mounting cavity, and screws are sequentially passed through the rear cover, the bracket, and the inner wall of the front end of the mounting cavity from the outside; a fixing plate perpendicular to the rear cover is provided on the inner side of the rear cover, and a second platform opposite to the fixing plate is provided in the mounting cavity. The second platform and the fixing plate are opposite to the lock beam hole on the right end of the lock body. The screws enter the mounting cavity of the lock body through the right end lock beam hole and pass through the second platform and the fixing plate from top to bottom, thereby fixing the rear cover to the lock body.

[0013] Preferably, a storage cavity is provided at the lower end of the lock body, the opening of the storage cavity is located at the front end of the lock body, and a door is provided at the front end of the storage cavity. The door is slidably provided on the left and right sides of the lock body. Slide rails are provided on both the left and right sides of the lock body, and sliders are provided on the upper inner sides of the left and right side walls of the door. The door cooperates with the slide rails through the sliders, and a pin is provided at the bottom of the slide rails.

[0014] Preferably, the upper ends of the sliders at both ends of the inner side of the door body are provided with buckles, and the left and right ends of the lock body are provided with a first door button and a second door button that cooperate with the buckles. The first door button and the second door button are respectively installed on the right and left ends of the front of the lock body. The first door button and the second door button are installed through the lock body. The inner side of the first door button abuts against the lower end of the extension plate at the rear end of the right side boss of the central axis. The second door button is opposite to the lower end of the bracket and a door button return spring is provided in the middle. One end of the door button return spring abuts against the second door button and the other end abuts against the bracket. The inner sides of the first door button and the second door button are respectively provided with a first latch and a second latch that cooperate with the buckles. The first latch and the second latch are respectively positioned outward and cooperate with the buckles on both sides of the door body.

[0015] Compared with existing technologies, this utility model of a combination lock features a central shaft within the mounting cavity of the lock body. Multiple downward-protruding latches are located at the bottom of the central shaft, and multiple inner rotors are fitted onto the shaft. The latches abut against the inner wall of the left end of each inner rotor. A radially inward-extending protrusion is located on the inner wall of the right end of each inner rotor, and a groove is formed along the axial direction of the inner rotor on the protrusion. A character wheel is fitted onto the outer side of each inner rotor. Rotating the character wheel drives the inner rotors. When the combination is correct, the latches align with the grooves of all the inner rotors. The lock body can be opened by driving the central shaft. The end of the central shaft is also fitted with a code-changing component. The code-changing component and the password component inside the lock body have a simple structure, are easy to assemble, and save costs. The lower end of the lock body is provided with a storage cavity, which adds storage function to the lock body. The door body that cooperates with the storage cavity is located at both ends of the lock body. The first door button that cooperates with the door body cooperates with the central shaft of the password component. When the password of the lock body is correct, the central shaft can move to the left. At this time, it can both unlock and open the door. The structure is simple and the functions are diverse. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the combination lock of this utility model.

[0017] Figure 2 This is a first exploded view of the combination lock of this utility model.

[0018] Figure 3 This is a second exploded view of the combination lock of this utility model.

[0019] Figure 4 This is an exploded view of the first back side of the combination lock of this utility model.

[0020] Figure 5 This is a cross-sectional view of the back of the combination lock of this utility model.

[0021] Figure 6 This is a first schematic diagram of the inner rotor of the combination lock of this utility model.

[0022] Figure 7 This is a second schematic diagram of the inner rotor of the combination lock of this utility model.

[0023] Figure 8 This is a third exploded view of the combination lock of this utility model.

[0024] Figure 9 This is an exploded view of the second back side of the combination lock of this utility model. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1 to 9As shown, the combination lock includes a lock body 1, a lock beam 2 is provided at the top of the lock body 1, the lock beam 2 passes through the lock beam holes on the left and right sides of the top of the lock body 1 and engages with the interior of the lock body 1; an installation cavity 11 is provided at the upper end of the interior of the lock body 1, the opening of the installation cavity 11 is located at the rear end of the lock body 1, a bracket 12 is provided inside the installation cavity 11, and a combination component is provided between the front end of the installation cavity 11 and the bracket 12; a locking structure is provided between the bracket 12 and the top of the installation cavity 11.

[0027] Both ends of the locking beam 2 are provided with annular grooves 21.

[0028] The locking structure includes a latch 3 mounted at the top of the mounting cavity 11. The latch 3 includes two through holes 31 and 32 that mate with the bottom of the lock beam 2. The first through hole 31 and the second through hole 32 are respectively opposite to the lock beam holes on the left and right sides of the top of the lock body 1. The left ends of the first through hole 31 and the second through hole 32 are respectively provided with a first arc-shaped groove 311 and a second arc-shaped groove 321 extending radially. The right end of the latch 3 is provided with a vertically downward extending flange 33, which is connected to the second through hole 32.

[0029] A locking button 13 is provided on the outer side of the folded edge 33. The locking button 13 passes through the lock body 1, with its inner end cooperating with the folded edge 33 and its outer end exposed on the outer side of the lock body 1.

[0030] A first groove 34 is provided in the middle of the front end of the locking tongue 3. The first groove 34 cooperates with the first platform 111 at the top of the inner end of the mounting cavity 11. The first platform 111 is L-shaped. A locking tongue return spring is provided at the first platform 111. One end of the locking tongue return spring abuts against the vertical inner wall of the first platform 111, and the other end abuts against the locking tongue 3.

[0031] The password assembly includes a central shaft 4, an inner rotor 5, a character wheel 6, and a central shaft spring 7. The central shaft 4 includes a boss 41 and a shaft 42. The boss 41 is located at the right end of the lock body 1. An extension plate 411 extending vertically is engaged on the rear side of the outer end of the boss 41. The extension plate 411 abuts against the inner side of the folded edge 33. The bottom of the shaft 42 of the central shaft 4 is provided with a plurality of evenly spaced and downwardly protruding latches 421. In this embodiment, the number of latches 421 is four.

[0032] Multiple inner rotors 5 are sleeved on the outer wall of the shaft 42, and the inner rotors 5 can rotate on the shaft 42. In this embodiment, the number of inner rotors 5 is four. The latch 421 abuts against the inner wall of the left end of the inner rotor 5. A radially inwardly extending protrusion 51 is provided on the inner wall of the right end of the inner rotor 5. A sliding groove 52 is provided on the protrusion 51 along the axial direction of the inner rotor 5. The bottom of the sliding groove 52 is at the same height as the inner wall of the front end of the inner rotor 5.

[0033] The code wheel 6 is sleeved on the outside of the inner rotor 5. The outer side of the inner rotor 5 is provided with a fixed tooth 53 extending axially to the rear end. The inner ring of the code wheel 6 is provided with a radial annular protrusion 61 that cooperates with the outer wall of the inner rotor 5. The annular protrusion 61 is provided with a slot 611 that cooperates with the fixed tooth 53. The code wheel 6 is engaged and fixed on the inner rotor 5 by the cooperation of the fixed tooth 53 and the slot 611. The code wheel 6 is evenly arranged with codes on the outer side. The codes can be numbers or letters. The bottom code of the code wheel 6 is opposite to the latch 421. The upper front side of the lock body 1 is provided with a mounting groove 14 that cooperates with the code wheel 6. The mounting groove 14 is connected to the mounting cavity 11. The front end of the code wheel 6 passes through the mounting groove 14 and protrudes from the outside of the lock body 1.

[0034] The front end of the protrusion 51 of the inner rotor 5 is provided with multiple trap grooves 511. The position and number of trap grooves 511 are relative to the position and number of the code wheel 6. When the code wheel 6 is incorrect, the latch 421 engages with the trap grooves 511. Since there are protruding teeth between adjacent trap grooves 511, when the code wheel is rotated, the latch 421 will make a "click" sound when it crosses the protruding teeth. Therefore, the setting of trap grooves 511 increases the difficulty of code matching and makes the combination lock more secure.

[0035] The width of the groove 52 is greater than the width of the latch 421 but less than the width of each character on the character wheel 6.

[0036] Each adjacent character on the character wheel 6 has a second groove, which is V-shaped. The bottom of the bracket 12 has several positioning plates 121 that are opposite to the character wheel 6. The positioning plates 121 are springs with a V-shaped top, and the top of the positioning plates 121 cooperates with the second groove of the character wheel 6. Each time the character wheel 6 is rotated, the positioning plates 121 are pushed downward. When they encounter the next second groove, the positioning plates 121 are reset. The function of the positioning plates 121 is to provide pressure and sound prompts when the character wheel 6 is rotated.

[0037] The central shaft spring 7 is sleeved on the shaft 42 between the inner rotor 5 and the boss 41. A washer is fixedly installed on the right side of the inner rotor 5. One end of the central shaft spring 7 abuts against the inner side wall of the boss 41, and the other end abuts against the washer.

[0038] When the password is incorrect, the combination lock is locked as follows: the first arc-shaped slot 311 and the second arc-shaped slot 321 respectively engage with the annular slots 21 at both ends of the bottom of the lock beam 2; at least one inner rotor 5's slide groove 52 is not aligned with the latch 421; at this time, the central shaft 4 cannot be pushed to the left by pressing the lock button 13 because at least one inner rotor 5's protrusion 51 is aligned with the latch 421, preventing it from moving.

[0039] The principle of the unlocking process is as follows: When the code wheel 6 is rotated to the correct code, the slide grooves 52 of all the inner rotors 5 are opposite to the latch 421. At this time, the lock button 13 is pressed, and the latch 421 will enter the slide groove 52. The central shaft 4 is pushed to the left, and the first arc-shaped groove 311 and the second arc-shaped groove 321 leave the annular grooves 21 at both ends of the bottom of the lock beam 2. The bottom ends of the lock beam 2 are opposite to the first through hole 31 and the second through hole 32. The diameter of the first through hole 31 and the second through hole 32 is larger than the diameter of the lock beam 2, allowing the lock beam 2 to pass through. The lock beam 2 can be removed from the lock body 1.

[0040] At the left end of the lock body 1 at the end of the central shaft 4, a code-changing assembly 8 is sleeved on the outer side of the end of the central shaft 4. The code-changing assembly 8 is also located between the mounting cavity 11 and the bracket 12. The code-changing assembly 8 includes an outer code-changing wheel 81 and an inner code-changing wheel 82 that cooperate with each other. The inner code-changing wheel 82 is sleeved on the end of the central shaft 4. A retaining spring is provided between the shaft body 42 at the end of the central shaft 4 and the inner code-changing wheel 82. The function of the retaining spring is to prevent the inner code-changing wheel 82 from moving to the left during the assembly process.

[0041] The inner side of the outer code-changing wheel 81 is a spiral ramp that rotates around the center. The contact surfaces of the inner code-changing wheel 82 and the outer code-changing wheel 81 are centrally symmetrical. Viewed from the left end to the right end of the lock body 1, the ramp on the side of the outer code-changing wheel 81 spirals upward in a counterclockwise direction with the highest slope at the top, while the ramp on the side of the inner code-changing wheel 82 spirals upward in a clockwise direction with the lowest slope at the top. The outer wall of the outer code-changing wheel 81 is provided with a first limiting block 811 that protrudes outward, and the outer wall of the inner code-changing wheel 82 is also provided with a second limiting block 821 that protrudes outward. The first limiting block 811 is engaged in the guide groove 123 of the bracket 12, and the second limiting block 821 abuts against the front side wall of the bracket 12. The outer side of the outer code-changing wheel 81 is exposed on the outer side of the lock body 1.

[0042] The principle of the code-changing process is as follows: rotate the outer code-changing wheel 81 clockwise and stop it; the rotation angle is 90 degrees. o The first limiting block 811 moves upward in the guide groove 123, and the ramp on the side of the outer code-changing wheel 81 pushes the inner code-changing wheel 82 to the right. Since the second limiting block 821 abuts against the front side wall of the bracket 12, the inner code-changing wheel 82 will not rotate clockwise with the outer code-changing wheel 81. During the movement of the inner code-changing wheel 82 to the right, it pushes the inner rotor 5 to the right. At this time, the latch 421 enters the slide groove 52, and the fixing tooth 53 no longer cooperates with the code wheel 6. When the code wheel 6 is rotated to the new code, the outer code-changing wheel 81 is released, and the inner rotor 5 and the inner code-changing wheel 82 are reset to the left under the action of the central shaft spring 7. At the same time, the outer code-changing wheel 81 is reset. After the reset is completed, the latch 421 leaves the slide groove 52 and cooperates with the left end of the inner rotor 5. The fixing tooth 53 of the inner rotor 5 re-cooperates with the code wheel 6.

[0043] The rear end of the mounting cavity 11 is fitted with a rear cover 15. Screws pass sequentially from the outside through the rear cover 15, the bracket 12, and the inner wall of the front end of the mounting cavity 11. A fixing plate 151 perpendicular to the rear cover 15 is provided on the inner side of the rear cover 15. A second platform 112 opposite to the fixing plate 151 is provided in the mounting cavity 11. The second platform 112 and the fixing plate 151 are opposite to the lock beam hole on the right end of the lock body 1. The screw enters the mounting cavity 11 of the lock body 1 through the right end lock beam hole and passes through the second platform 112 and the fixing plate 151 from top to bottom, thereby fixing the rear cover to the lock body 1. When the password is incorrect, the lock beam 2 is engaged with the lock body 1, and the screw cannot be removed through the right end lock beam hole, thus preventing the rear cover 15 from being removed. Only when the password is correct, the lock beam 2 is disengaged from the lock body 1, and the screw between the second platform 112 and the rear cover 15 can be removed through the right end lock beam hole, thereby removing the rear cover 15 from the lock body 1.

[0044] The lower end of the lock body 1 is provided with a storage cavity 16. The opening of the storage cavity 16 is located at the front end of the lock body 1. A door 17 is provided at the front end of the storage cavity 16. The door 17 is slidably located on the left and right sides of the lock body 1. A slide rail 18 is provided on both the left and right sides of the lock body 1. A slider 171 is provided on the upper inner side of the left and right side walls of the door 17. The door 17 cooperates with the slide rail 18 through the slider 171. A pin is provided at the bottom of the slide rail 18. When the door 17 slides to the bottom of the slide rail 18, the slider 171 cooperates with the pin to prevent the door 17 from falling.

[0045] The upper ends of the sliders 171 at both ends of the inner side of the door body 17 are provided with latches 172. The left and right ends of the lock body 1 are provided with a first door button 19 and a second door button 10 that cooperate with the latches 172. The first door button 19 and the second door button 10 are respectively installed on the right and left ends of the front of the lock body 1. The first door button 19 and the second door button 10 penetrate the lock body 1. The inner side of the first door button 19 abuts against the lower end of the extension plate 411 at the rear end of the right-side boss 41 of the central shaft 4. The second door button 10 is opposite to the lower end of the bracket 12, and a door button return spring is provided in the middle. One end of the door button return spring abuts against the second door button 10, and the other end abuts against the bracket 12. The inner sides of the first door button 19 and the second door button 10 are respectively provided with a first latch 191 and a second latch 101 that cooperate with the latches 172. The first latch 191 and the second latch 101 face each other. The external settings cooperate with the latches 172 on both sides of the door 17. When the password is correct, pressing the first door button 19 can push the central shaft 4 to the left, and the first latch 191 will disengage from the latch 172. Pressing the second door button 10 will cause the second latch 101 to disengage from the latch 172, thereby opening the door 17. When the first door button 19 and the second door button 10 are released, the first door button 19 will reset with the reset of the central shaft 4, and the second door button 10 will reset with the door button reset spring. The second door button 10 and the first door button 19 cooperate to play a stabilizing role.

[0046] The back of the lock body 1 can also be provided with an anti-collision pad for impact buffering; a protective cover can also be fitted on the lock beam 2.

[0047] This utility model of a combination lock features a central shaft 4 within the mounting cavity 11 of the lock body 1. The bottom end of the shaft 42 of the central shaft 4 has multiple downwardly protruding latches 421. Multiple inner rotors 5 are fitted onto the shaft 42. The latches 421 abut against the inner wall of the left end of each inner rotor 5. The inner wall of the right end of each inner rotor 5 has radially inwardly extending protrusions 51. Slide grooves 52 are provided on the protrusions 51 along the axial direction of each inner rotor 5. A code wheel 6 is fitted onto the outer side of each inner rotor 5. Rotating the code wheel 6 drives the inner rotor 5. When the combination is correct, the latches 421 engage with all the slide grooves 52 of the inner rotors 5. Yes, therefore, the central shaft 4 can be driven, thereby opening the lock body. The end of the central shaft 4 is also fitted with a code-changing component. The code-changing component and the password component inside the lock body 1 have a simple structure, are easy to assemble, and can save costs. In addition, a storage cavity 16 is set at the lower end of the lock body 1, which adds storage function to the lock body 1. The door body 17 that cooperates with the storage cavity 16 is set at both ends of the lock body 1. The first door button 19 that cooperates with the door body 17 cooperates with the central shaft 4 of the password component. When the password of the lock body 1 is correct, the central shaft 4 can move to the left. At this time, it can both unlock and open the door. The structure is simple and the functions are diverse.

[0048] Finally, it should be noted that the above embodiments only illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A combination lock, comprising a lock body (1), wherein a lock beam (2) is fitted at the top of the lock body (1), characterized in that, The upper part of the lock body (1) is provided with a mounting cavity (11), and a bracket (12) is provided inside the mounting cavity (11). A password component is provided between the front end of the mounting cavity (11) and the bracket (12). A locking structure is provided between the bracket (12) and the top of the mounting cavity (11). The locking structure includes a latch (3) mounted on the top of the mounting cavity (11). The latch (3) cooperates with the bottom of the lock beam (2). The right end of the latch (3) is provided with a vertically downward extending flange (33). A lock button (13) is provided on the outside of the flange (33). The password component includes a central shaft (4), an inner rotor (5), a character wheel (6), and a central shaft spring (7). The central shaft (4) contains... The shaft (4) includes a boss (41) and a shaft (42). The right end of the boss (41) abuts against the folded edge (33). The bottom of the shaft (42) of the central shaft (4) is provided with a plurality of latches (421) that are evenly spaced and protrude downwards. A plurality of inner rotors (5) are sleeved on the outer wall of the shaft (42). The latches (421) abut against the inner wall of the left end of the inner rotor (5). The inner wall of the right end of the inner rotor (5) is provided with a radially inwardly extending protrusion (51). The protrusion (51) is provided with a sliding groove (52) along the axial direction of the inner rotor (5). The character wheel (6) is sleeved on the outside of the inner rotor (5). The central shaft spring (7) is sleeved on the shaft (42) between the inner rotor (5) and the boss (41).

2. The combination lock according to claim 1, characterized in that, The opening of the mounting cavity (11) is located at the rear end of the lock body (1). The lock beam (2) passes through the lock beam holes on the left and right sides of the top of the lock body (1) and engages with the interior of the lock body (1). Both ends of the lock beam (2) are provided with annular grooves (21). The lock tongue (3) includes two through holes (31) and two through holes (32) that engage with the bottom of the lock beam (2). The first through hole (31) and the second through hole (32) are respectively opposite to the lock beam holes on the left and right sides of the top of the lock body (1). The left end of the hole (32) is provided with a first arc-shaped groove (311) and a second arc-shaped groove (321) extending radially. The front end of the latch (3) is provided with a first groove (34). The first groove (34) cooperates with the first platform (111) at the top of the mounting cavity (11). The first platform (111) is L-shaped. A latch return spring is provided at the first platform (111). One end of the latch return spring abuts against the vertical inner wall of the first platform (111), and the other end abuts against the latch (3).

3. The combination lock according to claim 1, characterized in that, The inner rotor (5) has a fixed tooth (53) extending axially to the rear end on its outer side. The inner ring of the character wheel (6) has a radially arranged annular protrusion (61) that mates with the outer wall of the inner rotor (5). The annular protrusion (61) has a slot (611) that mates with the fixed tooth (53). The bottom of the groove (52) of the inner rotor (5) is at the same height as the inner wall of the front end of the inner rotor (5). The front end of the protrusion (51) of the inner rotor (5) has multiple trap grooves. (511); The upper front side of the lock body (1) is provided with an installation groove (14) that cooperates with the code wheel (6). The installation groove (14) is connected to the installation cavity (11). The front end of the code wheel (6) passes through the installation groove (14) and protrudes outside the lock body (1). A washer is fixedly provided on the right side of the inner rotor (5). One end of the central shaft spring (7) abuts against the inner side wall of the boss (41). The number of the latches (421) is four, and the number of the inner rotors (5) is four.

4. The combination lock according to claim 2, characterized in that, The outer rear end of the boss (41) is fitted with an extension plate (411) that extends vertically. The extension plate (411) abuts against the inner side of the folded edge (33). The folded edge (33) is connected to the second through hole (32). The lock button (13) penetrates the lock body (1), with its inner end cooperating with the folded edge (33) and its outer end exposed on the outside of the lock body (1).

5. The combination lock according to claim 2, characterized in that, The character wheel (6) has a second groove between adjacent characters. The bracket (12) has several positioning pieces (121) at the bottom that are opposite to the character wheel (6). The top of the positioning piece (121) is engaged with the second groove of the character wheel (6).

6. The combination lock according to claim 1, characterized in that, A code-changing assembly (8) is sleeved on the outer side of the end of the central shaft (4). The code-changing assembly (8) is also set between the mounting cavity (11) and the bracket (12). The code-changing assembly (8) includes an outer code-changing wheel (81) and an inner code-changing wheel (82) that cooperate with each other. The inner code-changing wheel (82) is sleeved on the end of the central shaft (4). The inner side of the outer code-changing wheel (81) is a spiral ramp that rotates around the center. The surface of the inner code-changing wheel (82) that contacts the outer code-changing wheel (81) is a centrally symmetrical structure. From the left end to the right end of the lock body (1), the ramp on the side of the outer code-changing wheel (81) spirals upward in the counterclockwise direction with the highest slope at the top. The ramp on the side of the inner code-changing wheel (82) spirals upward in the clockwise direction with the lowest slope at the top.

7. The combination lock according to claim 6, characterized in that, The outer code-changing wheel (81) is provided with an outwardly protruding first limiting block (811) on its outer wall, and the inner code-changing wheel (82) is also provided with an outwardly protruding second limiting block (821) on its outer wall. The first limiting block (811) is engaged in the guide groove (123) of the bracket (12), and the second limiting block (821) abuts against the front side wall of the bracket (12). The outer side of the outer code-changing wheel (81) is exposed on the outer side of the lock body (1).

8. The combination lock according to claim 1, characterized in that, The rear end of the mounting cavity (11) is fitted with a rear cover (15). Screws are passed sequentially from the outside through the rear cover (15), the bracket (12), and the inner wall of the front end of the mounting cavity (11). A fixing plate (151) perpendicular to the rear cover (15) is provided on the inner side of the rear cover (15). A second platform (112) opposite to the fixing plate (151) is provided in the mounting cavity (11). The second platform (112) and the fixing plate (151) are opposite to the lock beam hole at the right end of the lock body (1). The screws enter the mounting cavity (11) of the lock body (1) through the right end lock beam hole and pass through the second platform (112) and the fixing plate (151) from top to bottom, thereby fixing the rear cover to the lock body (1).

9. The combination lock according to any one of claims 1-8, characterized in that, The lock body (1) has a storage cavity (16) at its lower interior end. The opening of the storage cavity (16) is located at the front end of the lock body (1). A door (17) is provided at the front end of the storage cavity (16). The door (17) is slidably located on the left and right sides of the lock body (1). A slide rail (18) is provided on both the left and right sides of the lock body (1). A slider (171) is provided on the upper inner side of the left and right side walls of the door (17). The door (17) cooperates with the slide rail (18) through the slider (171). A pin is provided at the bottom of the slide rail (18).

10. The combination lock according to claim 9, characterized in that, The upper ends of the sliders (171) at both ends of the inner side of the door body (17) are provided with buckles (172). The left and right ends of the lock body (1) are provided with a first door button (19) and a second door button (10) that cooperate with the buckles (172). The first door button (19) and the second door button (10) are respectively installed on the right and left ends of the front of the lock body (1). The first door button (19) and the second door button (10) are set through the lock body (1). The inner side of the first door button (19) is connected to the extension plate (4) at the rear end of the right side boss (41) of the central axis (4). 11) The lower ends abut against each other. The lower ends of the second door button (10) and the bracket (12) are opposite each other and a door button reset spring is provided in the middle. One end of the door button reset spring abuts against the second door button (10) and the other end abuts against the bracket (12). The inner sides of the first door button (19) and the second door button (10) are respectively provided with a first latch (191) and a second latch (101) that cooperate with the buckle (172). The first latch (191) and the second latch (101) are respectively arranged to cooperate with the buckles (172) on both sides of the door body (17).

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