Coded lock

Abstract

A coded lock is characterized in that a character wheel code assembly, a button assembly, a shifting piece and an output shaft are installed on a shell, a neck bush of the character wheel code assembly and a code wheel are installed on a wheel shaft, and in the rotating process of the output shaft, the shifting piece makes contact with contact parts, with different depths, of the output shaft and makes axial movement relative to the wheel shaft; the output shaft is further provided with a cam used for being matched with the wheel shaft, the two ends of the wheel shaft abut against the circumferential face of the elastic piece and the circumferential face of the cam respectively, and in the rotation process of the output shaft, the code wheel is reset through axial relative movement generated by the neck bush and the wheel shaft. According to the coded lock, switching of the locking state, the unlocking state and the password setting state is achieved through rotation of the output shaft, operation is convenient, in the rotation process of the output shaft, under joint driving of the cam and the output shaft, the neck bush and the wheel shaft axially move to generate time difference, and therefore the wheel shaft and the neck bush can rotate in the relative axial movement process. And the password wheel is released and automatically reset.

Description

Technical Field

[0001] The present invention relates to the technical field of locks, in particular to a combination lock. Background Art

[0002] There are various types of locks in the prior art, among which combination locks are widely used due to their convenience and novelty. Combination locks are usually opened using a series of numbers or symbols. Common combination locks can be divided into mechanical combination locks, digital combination locks, etc. Mechanical combination locks generally refer to a lock structure that rotates a set of combination wheels engraved with numbers to directly drive the mechanical operation inside the lock to achieve unlocking and locking. For example, the combination lock disclosed in the Chinese utility model patent with patent number 202021447239.0 (authorized public number CN213683572 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 piece mounted on the body; the unlocking assembly includes an unlocking piece mounted on the body, a first elastic piece connected to the unlocking piece for resetting the unlocking piece, a transmission plate for driving the unlocking piece to move, and a moving slide mounted on the body and connected to the transmission plate to drive the transmission plate to move; an anti-bias groove is provided on the unlocking piece; and an anti-bias part is provided on the transmission plate to prevent the transmission plate from deflecting. The combination lock drives the transmission plate to move through the moving slide, thereby driving the unlocking piece to move synchronously, so that the unlocking piece releases the pressing effect on the locking piece. In order to ensure the transmission stability of the transmission plate and the unlocking piece, the mechanical combination lock also needs to be used in conjunction with the anti-bias part and the anti-bias groove, and the structure is relatively complicated. Another example is the "Mechanical Coded Lock" disclosed in the Chinese utility model patent with patent number CN201320308335.0 (authorization announcement number CN 203441211 U). The mechanical code locked includes a front shell and a bottom shell. The front shell and the bottom shell form a storage space inside. The storage space is equipped with a cover plate, a wheel shaft, a clutch block, a pressing block, a movable block, a lock hook, an opening and closing lock mechanism that can control the opening and closing of the lock hook, and a lock block that can drive the opening and closing lock mechanism to move. The outer side of the wheel shaft is sleeved with a code adjustment block, a code adjustment wheel and a reset spring in sequence along the axis. The wheel shaft is provided with a push plate. The two ends of the reset spring abut against the code wheel and the push plate respectively. The push plate and the movable block abut against the clutch block on the same side. The outer end face of the code adjustment wheel is sleeved with a code wheel. The inner side of the code wheel is provided with a slot. The code adjustment wheel is provided with a second protrusion that can be plugged into the slot. The above code locked does not disclose the manual and automatic zeroing structure of the code wheel, which needs further improvement. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide a password lock that can switch between a locked state, an unlocked state and a password-set state by rotating an output shaft and can automatically clear and reset the password during the rotation of the output shaft in response to the above-mentioned existing technical status.

[0004] The second technical problem to be solved by the present invention is to provide a password lock whose password can be manually cleared and reset in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a password lock, including a housing, a word wheel password assembly, a button assembly, a toggle piece and an output shaft are installed on the housing, the word wheel password assembly includes a wheel shaft, an inner bushing and a password wheel, the inner bushing and the password wheel are installed on the wheel shaft and can rotate relative to the wheel shaft, the button assembly is used to toggle the password wheel 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: the outer peripheral surface of the output shaft is formed with contact parts of different depths and abutting against the end of the toggle piece, during the rotation of the output shaft, the toggle piece can contact the contact parts of different depths and move axially relative to the wheel shaft, thereby switching the password lock between a locked state, an unlocked state and a password setting state, and a cam for matching with the wheel shaft is also installed on the output shaft, one end of the wheel shaft abuts against the elastic member, and the other end of the wheel shaft abuts against the circumferential surface of the cam, and during the rotation of the output shaft, the password wheel is reset by the axial relative movement generated by the inner bushing and the wheel shaft.

[0006] There can be multiple limiting structures between the code wheel, the inner liner shaft and the wheel axle. Preferably, a limiting block is installed on the wheel axle, the inner circumferential wall of the code wheel is formed with a code wheel limiting groove extending along the axial direction, and the inner circumferential wall of the inner liner is formed with an inner liner limiting groove extending along the axial direction. The code wheel sleeve is arranged on the inner liner and the code wheel limiting groove and the inner liner limiting groove are axially staggered with each other. During the rotation of the output shaft, the limiting block is moved between the code wheel limiting groove and the inner liner limiting groove through the axial relative movement of the inner liner and the wheel axle, thereby releasing the limitation of the code wheel and the inner liner and resetting the code wheel.

[0007] The technical solution adopted by the present invention to solve the second technical problem is as follows: the elastic member of the password lock is a compression spring, one end of the compression spring is against the wheel axle, and the other end of the compression spring is against the shell. The wheel axle always maintains a tendency to press the cam under the action of the compression spring, and a driving block is installed on the outside of the shell. The driving block can drive the wheel axle to move away from the cam and move the limit block to the outside of the password wheel and the inner sleeve to release the limit on the password wheel and the inner sleeve. In this way, by turning the driving block, the limit block can be driven to move to the outside of the password wheel and the inner sleeve, releasing the limit on the password wheel, so that the password wheel can be manually reset.

[0008] The limit block can have a variety of installation structures. Preferably, a mounting hole is opened on the outer wall of the wheel shaft, a spring is installed at the bottom of the mounting hole, the bottom of the limit block extends into the mounting hole and abuts against the spring, and the head of the limit block is exposed on the outer wall of the wheel shaft. When the limit block adopts this structure, the limit block can always be installed on the wheel shaft. When the limit block is limited on the password wheel limit groove or the inner sleeve limit groove, it can prevent the password wheel from being reset. However, when the user presses the button assembly to set the password or enter the password, the pressing force can overcome the limit of the limit block on the password wheel or the inner sleeve, thereby smoothly turning the password wheel.

[0009] Further preferably, the word wheel password assembly also includes a torsion spring and a reset spring, a clutch structure is provided between the password wheel and the inner sleeve, the torsion spring is sleeved on the wheel shaft, and 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 inner sleeve, and the inner sleeve always maintains a tendency to move outward to separate the clutch structure, when the clutch structure is separated, the password wheel can rotate relative to the inner sleeve, and when the clutch structure is engaged, the password wheel and the inner sleeve can rotate synchronously. In this way, after the clutch structure is separated, the password wheel can be set by rotating the password wheel, and the torsion spring can smoothly reset the password wheel after rotation, the torsion of the torsion spring is less than the resistance of the limit block to the password wheel or the inner sleeve, and the password wheel can only be reset after the limit block releases the limit on the password wheel and the inner sleeve, and in addition, in the password setting state, the reset spring drives the inner sleeve to move outward relative to the password wheel to separate the clutch structure.

[0010] There can be multiple clutch structures. Preferably, the clutch structure includes a convex rib convexly arranged on the outer peripheral wall of the inner 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 inner sleeve, and the key slot is arranged along the circumference of the code wheel. The toggle piece can drive the inner sleeve to move inside the code wheel so that the convex rib is inserted into the corresponding key slot. The reset spring can drive the inner sleeve to move outside 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 inner 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 inner sleeve. In this way, the inner sleeve and the code wheel can rotate synchronously or the code wheel can rotate relative to the inner 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 inner 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 inner sleeve can only rotate at the same time, and the password can be input at this time.

[0011] Further preferably, the inner sleeve is formed with an inner 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 matched with 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. In this way, after the correct password is input in the locked state, the inner sleeve and the password wheel rotate synchronously to the 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.

[0012] In order to enable the output shaft to rotate before the cam and also to drive the cam to rotate synchronously, a redundant groove is opened on the inner circumferential wall of the cam in the circumferential direction, and the redundant groove is arranged on the inner circumferential wall of the outer protrusion of the cam. A first stopper is convexly provided on the outer circumferential wall of the output shaft. The first stopper can move in the redundant groove as the output shaft rotates, and when the first stopper is in contact with the end face of the redundant groove, the output shaft drives the cam to rotate synchronously.

[0013] 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 is circumferentially formed with 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 is against the small arc surface, in the unlocked state, the end of the toggle piece is against the large arc surface, and in the password setting state, the end of the toggle piece extends into the groove.

[0014] In order to limit the rotation of the output shaft, a second stopper 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 housing. In the locked state, the output shaft rotates until the second stopper 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 second stopper 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, at this time, the 0° position and the 180° position are horizontal positions and in opposite directions, and the 90° position is a vertical position.

[0015] To facilitate assembly, 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 rotating portion, the lower end of the output shaft extends downward from the lower cover, and the locking tongue is arranged below the lower cover and mounted on the lower end of the output shaft.

[0016] Compared with the prior art, the advantages of the present invention are that: the outer peripheral surface of the output shaft of the combination lock is formed with contact parts of different depths that abut against the end of the toggle plate. During the rotation of the output shaft, the toggle plate can contact the contact parts of different depths and move axially relative to the wheel axle, thereby switching the combination lock between a locked state, an unlocked state and a password-setting state. The operation is very convenient, and by installing a cam that matches the wheel axle on the output shaft, during the rotation of the output shaft, under the joint drive of the cam and the output shaft, a time difference can be generated in the axial movement of the inner sleeve and the wheel axle. During the relative axial movement of the wheel axle and the inner sleeve, the combination wheel can be released and automatically cleared and reset. In addition, the combination wheel can be manually cleared and reset by operating the drive block on the housing to meet the different needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the password lock of the embodiment of the present invention (locked state);

[0018] Figure 2 for Figure 1 An exploded schematic diagram of the combination lock shown;

[0019] Figure 3 for Figure 1 The schematic diagram of the structure of the password lock with the upper cover removed;

[0020] Figure 4 for Figure 1 The schematic diagram of the structure of the password lock shown is a schematic diagram of the structure of the combination lock after removing the upper cover, lower cover and button assembly;

[0021] 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);

[0022] Figure 6 for Figure 1 A partial structural cross-sectional view of the combination lock shown;

[0023] Figure 7 It is a schematic diagram of the structure of the output shaft and cam of the combination lock according to the embodiment of the present invention;

[0024] Figure 8 for Figure 7 An exploded schematic diagram of the output shaft and cam is shown;

[0025] Fig. 9 This is a schematic diagram of the structure of the output shaft of the combination lock according to an embodiment of the present invention;

[0026] Fig.10 It is a partial exploded schematic diagram of a word wheel password component of a password lock according to an embodiment of the present invention;

[0027] Fig.11Schematic diagram of the structure of the password lock of the embodiment of the present invention (unlocked state);

[0028] Fig.12 for Fig.11 The schematic diagram of the structure of the password lock with the upper cover removed;

[0029] Fig.13 for Fig.11 The internal structure diagram of the password lock shown;

[0030] Fig.14 for Fig.11 A schematic diagram of the structure of the combination lock from another angle (without the lower cover and the lock tongue);

[0031] Fig.15 for Fig.11 A partial structural cross-sectional view of the combination lock shown;

[0032] Fig.16 Schematic diagram of the structure of the password lock according to an embodiment of the present invention (assuming password status);

[0033] Fig.17 for Fig.16 The schematic diagram of the structure of the password lock with the upper cover removed;

[0034] Fig.18 for Fig.16 A schematic diagram of the structure of the combination lock from another angle (without the lower cover and the lock tongue);

[0035] Fig.19 for Fig.16 A partial structural cross-sectional view of the combination lock shown;

[0036] Fig. 20 This is a schematic diagram of the structure of a password according to an embodiment of the present invention (password is automatically cleared);

[0037] Fig.21 for Fig. 20 A schematic diagram of the structure of the combination lock from another angle (without the lower cover and the lock tongue);

[0038] Fig. 22 for Fig. 20 A partial structural sectional view of the combination lock shown. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings.

[0040] like Figures 1 to 6As shown, the password lock of this embodiment includes a housing 1, on which are mounted main components such as a wheel password assembly 2, a button assembly 3, a toggle plate 4, an output shaft 5, a lock tongue 6, a convex block 7, a compression spring 8 and a drive block 9. Among them, the housing 1 includes an upper cover 11 and a lower cover 12, and the lower cover 12 is detachably mounted at the bottom of the upper cover 11. The main body of the wheel password assembly 2 and the output shaft 5 is arranged inside the upper cover 11, the upper end of the output shaft 5 extends upward from the upper cover 11 to form a knob portion 56, and 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 at the lower end of the output shaft 5. By rotating the rotating portion 56, the lock tongue 6 is driven to rotate synchronously, thereby realizing unlocking and locking. When it is necessary to set a password or input a password, the button assembly 3 is pressed to toggle the password wheel 23 of the wheel password assembly 2 to rotate.

[0041] The toggle piece 4 is arranged inside the upper cover 11. Figure 3 The direction indicated by the middle arrow A is the forward direction, and the front end of the toggle plate 4 always abuts against the outer circumference of the output shaft 5. The outer circumference of the output shaft 5 has contact parts of different depths that abut against the toggle plate 4. During the rotation of the output shaft 5, the front end of the toggle plate 4 contacts the contact parts of different depths and moves axially forward and backward 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. Figures 7 to 9 As shown, the outer circumferential surface of the output shaft 5 is formed with 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.

[0042] like Fig.10As shown, the combination lock has four groups of wheel password components 2, that is, a four-digit password can be set. Each group of wheel password components 2 includes a wheel shaft 21, an inner sleeve 22, a password wheel 23, a torsion spring 24 and a reset spring 25, wherein the inner sleeve 22 and the password wheel 23 are sleeved on the wheel shaft 21 and can rotate relative to the wheel shaft 21, the password wheel 23 is also sleeved on the inner 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 between the password wheel 23 and the inner sleeve 22, so that the inner sleeve 22 always maintains a tendency to move outward, that is, forward. The inner sleeve 22 of this embodiment is formed with an inner sleeve body 221, a first boss 222 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 222. The outer peripheral wall of the first boss 222 is formed with circumferentially spaced ribs 225, and the inner peripheral wall of the code wheel 23 is formed with circumferentially spaced key slots 231. The ribs 225 and the key slots 231 constitute a clutch structure. During operation, the toggle plate 4 can drive the inner sleeve 22 to move inside the code wheel 23 so that the ribs 225 are inserted into the corresponding key slots 231. At this time, the clutch structure is in an engaged state, and the inner sleeve 22 and the code wheel 23 keep rotating synchronously. The reset spring 25 can drive the inner sleeve 22 to move outside the code wheel 23 so that the ribs 225 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 inner sleeve 22 to set the code.

[0043] The second boss 222 of the inner sleeve 22 is provided with a notch 226 in the circumferential direction, and each inner sleeve 22 has one notch 226, and the toggle plate 4 has a protrusion 41 that matches the corresponding notch. When the clutch structure is engaged, since the inner sleeve 22 and the code wheel 23 rotate synchronously, that is, the position of the notch 226 also moves synchronously in the circumferential direction, and the toggle plate 4 can only move axially but cannot rotate circumferentially, therefore, when the inner sleeve 22 rotates to the state where the notch 226 is aligned with the protrusion 41, the toggle plate 4 can move inward relative to the inner sleeve 22 under the drive of the output shaft 5, and then be inserted into the notch 226.

[0044] Since the inner sleeve 22 always maintains a tendency to move forward under the action of the return spring 25, the toggle plate 4 maintains contact with the inner sleeve 22, and the front end of the toggle plate 4 always abuts against the contact part of the output shaft 5. Therefore, as the output shaft 5 rotates, when the front end of the toggle plate 4 abuts against the contact parts of different depths, the inner sleeve 22 can move axially forward and backward.

[0045] The cam 7 is mounted on the output shaft 5. The inner peripheral wall of the cam 7 is provided with a redundant groove 71 in the circumferential direction. The redundant groove 71 is provided on the inner peripheral wall of the outer convex part of the cam 7. The outer peripheral wall of the output shaft 5 is provided with a first stopper 54. The first stopper 54 can move in the redundant groove 71 as the output shaft 5 rotates. In addition, when the first stopper 54 abuts against the end face of the redundant groove 71, the output shaft 5 drives the cam 7 to rotate synchronously. The cam 7 is used to cooperate with the axle 21 of the word wheel password assembly 2. The front end of the axle 21 abuts against the circumference of the cam 7, and the rear end of the axle 21 is provided with a compression spring 8. The front end of the compression spring 8 abuts against the axle 21, and the rear end of the compression spring 8 abuts against the upper cover 11. Under the action of the compression spring 8, the axle 21 always maintains a tendency to press the cam 7. Therefore, during the rotation of the cam 7, the axle 21 can move axially forward and backward by contacting the different convex and concave circumferences of the cam 6.

[0046] Through the concave-convex surface structural design of the cam 7 and the structural design of the contact parts of the output shaft 5 with different depths, under the joint drive of the cam 7 and the output shaft 5, a time difference can be generated in the axial movement of the inner bushing 22 and the wheel shaft 21. By utilizing this time difference, the code wheel 23 can be released and automatically reset during the relative axial movement of the wheel shaft 21 and the inner bushing 22. The specific principle is as follows.

[0047] like Fig.10As shown, a limit block 211 is installed on the axle 21, and the specific installation structure is as follows: a mounting hole 212 is opened on the outer wall of the axle 21, a spring 213 is installed at the bottom of the mounting hole 212, the bottom of the limit block 211 extends into the mounting hole 212 and abuts against the spring 213, and the head of the limit block 211 is exposed on the outer wall of the axle 21, so that the limit block 211 can always be connected to the axle 21. The inner peripheral wall of the code wheel 23 is formed with a code wheel limit groove 231 extending along the axial direction, and the inner peripheral wall of the inner sleeve 22 is formed with an inner sleeve limit groove 224 extending along the axial direction. The code wheel 23 is sleeved on the inner sleeve 22, and the code wheel limit groove 231 and the inner sleeve limit groove 224 are staggered in the axial direction. When the clutch structure of the code wheel 23 and the inner sleeve 22 is engaged, the code wheel 23 and the inner sleeve 22 can keep synchronous rotation. When the limit block 211 is limited on the code wheel limit groove 213 or the inner sleeve limit groove 224, the resistance generated by the limit block 211 is greater than the torque of the torsion spring 24, and the limit block 211 prevents the code wheel 23 from being reset. However, when the user presses the button assembly to set the password or input the password, the pressing force can overcome the limit of the limit block on the code wheel or the inner sleeve, and then smoothly turn the code wheel to rotate. In this embodiment, during the rotation of the output shaft 5, specifically during the process of turning from the unlocked state to the locked state, under the joint drive of the cam 7 and the output shaft 5, the return of the inner sleeve 22 and the return of the wheel shaft 21 produce a time difference, and the inner sleeve 22 and the wheel shaft 21 produce axial relative movement. When the limit block 211 moves between the code wheel limit groove 231 and the inner sleeve limit groove 224, the limit block 211 releases the limit on the code wheel 23 and the inner sleeve 22. At this time, the code wheel 23 can be reset under the action of the torsion spring 24.

[0048] In addition, the password wheel of this embodiment also has a manual clearing function, and a driving block 9 is installed outside the upper cover 11. Figure 3 As shown, when the code wheel 23 needs to be manually reset, the drive block is pushed backward, and the drive block 9 drives the wheel shaft 21 to move backward away from the cam 7. When the limit block 211 moves backward to the rear side of the code wheel 23, the limit block 211 releases the limit on the code wheel 23, and the code wheel 23 can be reset under the action of the torsion spring 24. At this time, the compression spring 8 is in a compressed state, and the drive block 9 is released, and the drive block resets forward under the elastic force of the compression spring 8. The manual reset operation can be performed in any state.

[0049] A second stopper 55 is convexly disposed on the outer peripheral wall of the output shaft 5, and a first limiting wall 121 and a second limiting wall 122 are formed on the lower cover 12. Figure 3 As shown, in the locked state, the output shaft 5 rotates until the second stopper 55 abuts against the first limiting wall 121, so that the lock tongue 6 is at the 0° position. Fig.17As shown, in the password setting state, the output shaft 5 rotates until the second stopper 55 abuts against the second limiting wall 122 so that the lock tongue 6 is in the 180° position, and in the unlocking state, the lock tongue 6 is in the 90° position. Assuming that the password lock is installed vertically, the 0° position and the 180° position are horizontal positions, and the 90° position is a vertical position. In addition, limiting notches 57 are arranged at intervals on the outer peripheral wall of the output shaft 5, and an elastic lock pin 10 is installed on the lower cover 12. When the password lock is in different states, when the elastic lock pin 10 is inserted into the corresponding limiting notch 57, the output shaft 5 is limited, and the output shaft 5 is rotated, and the elastic lock pin 10 is disengaged from the limiting notch 57.

[0050] The working principle of this combination lock is as follows:

[0051] like Figures 1 to 10 As shown, the combination lock is in a locked state, and the lock tongue 6 is at the 0° position. The toggle plate 4 abuts against the small arc surface 52, that is, the toggle plate 4 is in the middle position, and the wheel shaft 21 abuts against the concave surface of the cam 7, that is, the wheel shaft 21 moves forward to the maximum position. At this time, Figure 6 As shown, the limit block 211 is limited on the inner sleeve limit groove 224 of the inner sleeve 22, and the inner sleeve 22 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 inner sleeve 22 and the password wheel 23 rotate synchronously by one word wheel number. When the correct password is entered, the notches 226 of the four inner sleeves 22 are all on the same straight line and aligned with the corresponding protrusions 41 of the toggle plate 4. At this time, the output shaft 5 can rotate smoothly to unlock. In addition, in the locked state, along the rotation direction of the output shaft 5, the first stopper 54 of the output shaft 5 is arranged at the rear end of the redundant groove 71 of the cam 7. Therefore, when the output shaft 5 starts to rotate from the locked state to the unlocked state, the cam 7 first remains stationary. Only when the first stopper 54 abuts against the front end of the redundant groove 71, the output shaft 5 starts to drive the cam 7 to rotate synchronously. In this embodiment, the cam 7 starts to rotate only after the output shaft 5 rotates until the large arc surface 51 abuts against the toggle rod 4, and gradually makes the wheel axle 21 gradually transition from contacting the concave surface of the cam 7 to contacting the convex surface. That is to say, before the wheel axle 21 retreats, the toggle rod 4 has retreated, that is, the inner sleeve 22 has retreated, and the distance between the inner sleeve limiting groove 224 and the code wheel limiting groove 231 is smaller than the limit block 211. Therefore, when the wheel axle 21 retreats under the drive of the cam 7, the limit block 211 will limit the code wheel 23 when passing between the inner sleeve limiting groove 224 and the code wheel limiting groove 231, and will not reset the code wheel 23.

[0052] like Figures 11 to 15As shown, the combination lock is in the unlocked state, and the lock tongue 6 is at the 90° position. The toggle plate 4 abuts against the large arc surface 51, that is, the toggle plate 4 moves backward to the maximum position, and the axle 21 abuts against the convex surface of the cam 7, that is, the axle 21 moves backward to the maximum position. At this time, Fig.15 As shown, the limit block 211 is limited on the code wheel limit groove 231 of the code wheel 23, and, driven by the toggle rod 4, the entire inner sleeve 22 is pushed backward into the interior of the code wheel 23, and the inner sleeve 22 and the code wheel 23 are still in an engaged state.

[0053] like Figures 16 to 19 As shown in FIG. 1 , the combination lock is in the password setting state, and the lock tongue 6 is in the 180° position. The toggle plate 4 is inserted into the groove 53, that is, the toggle plate 4 moves forward to the maximum position, and the axle 21 still abuts against the convex surface of the protrusion 7, that is, the axle 21 moves backward to the maximum position. At this time, Fig.19 As shown, the limit block 211 is still limited on the code wheel limit groove 231 of the code wheel 23. At the same time, under the action of the reset spring 25, the inner sleeve 22 moves forward to the maximum distance relative to the code wheel 23, so that the rib 225 of the inner sleeve 22 is disengaged from the key groove 231 of the code wheel 23, that is, the clutch structure is in a disengaged state. At this time, the four notches 226 of the inner sleeve 22 are still located on the same straight line, and the protrusion 41 is still arranged in the corresponding notch 226. When setting the password, when the button assembly 3 is pressed, the code wheel 23 rotates, and the inner sleeve 22 does not rotate.

[0054] like Figure 20 to Figure 22 As shown, 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. Along the reverse rotation direction of the output shaft 5, the first stopper 54 is arranged at the rear end of the redundant groove 71. Therefore, when the output shaft 5 rotates in the reverse direction, the cam 7 remains stationary first. Only when the first stopper 54 abuts against the front end of the redundant groove 71, the output shaft 5 starts to drive the cam 7 to rotate in the reverse direction synchronously. When the output shaft 5 rotates in the reverse direction until the toggle plate 4 abuts against the small arc surface 52, the inner bushing 22 has moved backward relative to the password wheel 23, that is, the rib 225 has been inserted into the key slot 231, and the inner bushing 22 can rotate synchronously with the password wheel 23. In this embodiment, when the locking tongue 6 rotates from 90° to 0°, after the output shaft 5 rotates in the opposite direction until the shifting piece 4 abuts against the small arc surface 52, the wheel shaft 21 gradually transitions from contacting the convex surface of the cam 7 to contacting the concave surface. Under the joint drive of the cam 7 and the output shaft 5, the axial movement of the inner bushing 22 and the wheel shaft 21 produces a time difference, that is, asynchronous movement. Fig. 22As shown, the limit block 211 moves between the code wheel limit groove 231 and the inner sleeve limit groove 224, and the limit block 211 releases the limit on the code wheel 23 and the inner sleeve 22, so that the code wheel 23 can be automatically reset under the action of the torsion spring 24. At the same time, the notch 226 of the inner sleeve 22 rotates synchronously to be staggered with the protrusion 41 corresponding to the toggle rod 4, and finally returns to the 0° locked position. After the correct password is entered next time, the staggered notches 226 are aligned and unlocked at the 90° position.

[0055] 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 wheel combination assembly (2) comprises a wheel shaft (21), an inner sleeve (22) and a combination wheel (23), wherein the inner sleeve (22) and the combination wheel (23) are mounted on the wheel shaft (21) and can rotate relative to the wheel shaft (21), wherein the button assembly (3) is used to toggle the combination wheel (23) to rotate, and a lock tongue (6) which rotates synchronously with the output shaft (5) is mounted at the output end of the output shaft (5), wherein: The outer circumferential surface of the output shaft (5) is formed with contact portions of different depths that abut against the end of 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 shaft (21), thereby switching the combination lock between a locked state, an unlocked state and a combination setting state. The output shaft (5) is also provided with a cam (7) for matching with the wheel shaft (21). One end of the wheel shaft (21) abuts against the elastic member, and the other end of the wheel shaft (21) abuts against the circumferential surface of the cam (7). During the rotation of the output shaft (5), the inner bushing (22) and the wheel shaft (21) generate axial relative movement, so that the combination wheel (23) is reset.

2. The combination lock according to claim 1, characterized in that: A limiting block (211) is installed on the wheel axle (21); the inner peripheral wall of the code wheel (23) is formed with a code wheel limiting groove (231) extending along the axial direction; the inner peripheral wall of the inner sleeve (22) is formed with an inner sleeve limiting groove (224) extending along the axial direction; the code wheel (23) is sleeved on the inner sleeve (22) and the code wheel limiting groove (231) and the inner sleeve limiting groove (224) are mutually staggered in the axial direction; during the rotation of the output shaft (5), the limiting block (211) is moved between the code wheel limiting groove (231) and the inner sleeve limiting groove (224) through the axial relative movement of the inner sleeve (22) and the wheel axle (21), thereby releasing the limiting of the code wheel (23) and the inner sleeve (22) and resetting the code wheel (23).

3. The combination lock according to claim 2, characterized in that: The elastic member is a compression spring (8), one end of the compression spring (8) is in contact with the wheel axle (21), and the other end of the compression spring (8) is in contact with the housing (1). Under the action of the compression spring (8), the wheel axle (21) always maintains a tendency to press the cam (7). A driving block (9) is installed outside the housing (1). The driving block (9) can drive the wheel axle (21) to move away from the cam (7) and move the limit block (211) to the outside of the code wheel (23) and the inner sleeve (22) to release the limit on the code wheel (23) and the inner sleeve (22).

4. The combination lock according to claim 2, characterized in that: The outer wall of the wheel axle (21) is provided with a mounting hole (212), the bottom of the mounting hole (212) is provided with a spring (213), the bottom of the limit block (211) extends into the mounting hole (212) and abuts against the spring (213), and the head of the limit block (211) is exposed on the outer wall of the wheel axle (21).

5. The combination lock according to claim 2, characterized in that: The word wheel cipher assembly (2) further comprises a torsion spring (24) and a reset spring (25); a clutch structure is provided between the cipher wheel (23) and the inner sleeve (22); the torsion spring (24) is sleeved on the wheel axle (21); two ends of the torsion spring (24) are respectively mounted on the housing (1) and the cipher wheel (23) so that the cipher wheel (23) maintains a tendency to reset after rotation; the reset spring (25) is sleeved on the wheel axle (21) and abuts against the cipher wheel (23) and the inner sleeve (22) so that the inner sleeve (22) always maintains a tendency to move outwards so that the clutch structure is separated; when the clutch structure is separated, the cipher wheel (23) can rotate relative to the inner sleeve (22); when the clutch structure is engaged, the cipher wheel (23) and the inner sleeve (22) can rotate synchronously.

6. The combination lock according to claim 5, characterized in that: The clutch structure comprises a convex rib (225) protruding from the outer peripheral wall of the inner sleeve (22) and a key slot (232) formed on the inner peripheral wall of the code wheel (23); the convex rib (225) is arranged along the circumference of the inner sleeve (22); the key slot (232) is arranged along the circumference of the code wheel (23); the paddle (4) can drive the inner sleeve (22) to move toward the inside of the code wheel (23) so that the convex rib (225) is inserted into the corresponding key slot (232). ), the reset spring (25) can drive the inner sleeve (22) to move outside the code wheel (23) so that the convex rib (225) is disengaged from the corresponding key slot (232); when the convex rib (225) is inserted into the key slot (232), the inner sleeve (22) and the code wheel (23) rotate synchronously; when the convex rib (225) is disengaged from the key slot (232), the code wheel (23) can rotate relative to the inner sleeve (22).

7. The combination lock according to claim 6, characterized in that: The inner sleeve (22) is formed with an inner sleeve body (221), a first boss (222) and a second boss (223) in sequence along the axial direction from the inside to the outside. The outer diameter of the second boss (223) is larger than the outer diameter of the first boss (222). The ribs (225) are circumferentially spaced and distributed on the outer peripheral wall of the first boss (222). A notch (226) is circumferentially provided on the second boss (223). The shifting plate (4) has a protrusion (41) that matches the notch (226). The protrusion (41) can be inserted into the notch (226) under the drive of the output shaft (5) when aligned with the corresponding notch (226).

8. The combination lock according to claim 1, characterized in that: A redundant groove (71) is formed on the inner peripheral wall of the cam (7) along the circumferential direction. The redundant groove (71) is arranged on the inner peripheral wall of the outer protrusion of the cam (7). A first stopper (54) is convexly provided on the outer peripheral wall of the output shaft (5). The first stopper (54) can move in the redundant groove (71) as the output shaft (5) rotates. In addition, when the first stopper (54) abuts against the end surface of the redundant groove (71), the output shaft (5) drives the cam (7) to rotate synchronously.

9. The combination lock according to claim 1, characterized in that: The outer peripheral surface of the output shaft (5) is formed with 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 (51) and the small arc surface (52) and further inward from the small arc surface (52) along the circumferential direction; 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).

10. The combination lock according to claim 1, characterized in that: A second stopper (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 second stopper (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 second stopper (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.

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