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 available in the prior art. Combination locks are widely used due to their ease of use and novel design. Combination locks typically use a series of numbers or symbols to unlock. Common combination locks can be categorized as mechanical locks, digital locks, and so on. Mechanical combination locks generally involve rotating a set of numbered combination wheels, which directly activate the internal mechanism to unlock and lock the lock. For example, the combination lock disclosed in Chinese utility model patent No. 202021447239.0 (authorization publication No. CN213683572 U) includes a main body, on which is provided a lock assembly, an unlocking assembly used in conjunction with the lock assembly, and a combination assembly for adjusting the state of the unlocking assembly; the lock assembly includes a lock piece mounted on the main body; the unlocking assembly includes an unlocking piece mounted on the main body, a first elastic member connected to the unlocking piece for resetting the unlocking piece, a transmission plate for driving the unlocking piece to move, and a movable slide mounted on the main body and connected to the transmission plate to drive the transmission plate to move; the unlocking piece is provided with an anti-deflection groove; the transmission plate is provided with an anti-deflection portion that cooperates with the anti-deflection groove to prevent the transmission plate from deflecting. This combination lock drives the transmission plate to move via the movable slide, thereby driving the unlocking piece to move synchronously, so that the unlocking piece releases its tightness against the locking piece. To ensure the transmission stability of the transmission plate and the unlocking piece, this mechanical combination lock also requires the use of an anti-deflection portion and an anti-deflection groove, resulting in a relatively complex structure. Another example is the "Mechanical Combination Lock" disclosed in Chinese Utility Model Patent No. CN201320308335.0 (Grant Announcement No. CN 203441211 U). This mechanical combination lock includes a front shell and a bottom shell, which form a storage space within the front shell and bottom shell. 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. The wheel shaft is provided 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, and the two ends of the reset spring respectively abut the code wheel and the push plate. The push plate and the movable block respectively abut the clutch block on the same side. The code adjustment wheel is provided with a code wheel on the outer end face, and a slot is provided on the inner side of the code adjustment wheel. The code adjustment wheel is provided with a second protrusion that can be inserted into the slot. The above-mentioned combination lock does not disclose the manual and automatic reset structures 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 the output shaft, and can automatically 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 in which the password can be manually cleared and reset in response to the above-mentioned existing technical status.

[0005] The present invention solves the first technical problem described above by adopting a technical solution: a combination lock comprising a housing, on which a combination wheel assembly, a button assembly, a toggle plate, and an output shaft are mounted, the combination wheel assembly comprising an axle, an inner sleeve, and a combination wheel, the inner sleeve and the combination wheel being mounted on the axle and rotatable relative to the axle, the button assembly being used to toggle the combination wheel for rotation, and a lock tongue being mounted on the output end of the output shaft for synchronous rotation with the output shaft, characterized in that: an outer circumferential surface of the output shaft is formed with contact portions of varying depths that abut against an end of the toggle plate, and during rotation of the output shaft, the toggle plate can contact the contact portions of varying depths and move axially relative to the axle, thereby switching the combination lock between a locked state, an unlocked state, and a combination setting state, and the output shaft is further mounted with a cam for cooperating with the axle, one end of the axle abutting against an elastic member, and the other end of the axle abutting against the circumferential surface of the cam, and during rotation of the output shaft, the combination wheel is reset by axial relative movement between the inner sleeve and the axle.

[0006] There can be multiple limiting structures between the code wheel, the inner lining 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 lining is formed with an inner lining limiting groove extending along the axial direction. The code wheel is sleeved on the inner lining and the code wheel limiting groove and the inner lining 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 lining limiting groove through the axial relative movement of the inner lining and the wheel axle, thereby releasing the limitation on the code wheel and the inner lining and resetting the code wheel.

[0007] The technical solution adopted by the present invention to solve the second technical problem mentioned above is as follows: the elastic member of the combination lock is a compression spring, one end of which is against the wheel shaft and the other end of which is against the housing. Under the action of the compression spring, the wheel shaft always maintains a tendency to press the cam. A driving block is installed on the outside of the housing. The driving block can drive the wheel shaft to move away from the cam and move the limit block to the outside of the combination wheel and inner bushing to release the limit on the combination wheel and inner bushing. In this way, by turning the driving block, the limit block can be driven to move to the outside of the combination wheel and inner bushing, releasing the limit on the combination wheel and allowing the combination wheel to be manually reset.

[0008] The limit block can have various mounting structures. Preferably, a mounting hole is formed on the outer wall of the wheel axle, a spring is installed at the bottom of the mounting hole, the bottom of the limit block extends into the mounting hole and contacts the spring, and the head of the limit block is exposed on the outer wall of the wheel axle. With this structure, the limit block can be always installed on the wheel axle. When the limit block is located in the limiting groove of the code wheel or the limiting groove of the inner bushing, it can prevent the code wheel from being reset. However, when the user presses the button assembly to set or enter the password, the pressing force can overcome the limit of the limit block on the code wheel or the inner bushing, thereby smoothly turning the code wheel.

[0009] Further preferably, the code wheel assembly further comprises a torsion spring and a return spring, a clutch structure being provided between the code wheel and the inner sleeve, the torsion spring being sleeved on the wheel shaft, the two ends of the torsion spring being respectively mounted on the housing and the code wheel, so that the code wheel maintains a tendency to reset after rotation, the return spring being sleeved on the wheel shaft and abutting against the code wheel and the inner sleeve, and so that the inner sleeve always maintains a tendency to move outwards, thereby separating the clutch structure, in a state where the clutch structure is separated, the code wheel can rotate relative to the inner sleeve, and in a state where the clutch structure is engaged, the code wheel and the inner sleeve can rotate synchronously. With such a configuration, after the clutch structure is separated, the code wheel can be rotated to set the code, and the torsion spring can smoothly reset the rotated code wheel, the torsion force of the torsion spring being less than the resistance of the limit block to the code wheel or the inner sleeve, and the code wheel can only reset after the limit block releases the limit on the code wheel and the inner sleeve, and in the code setting state, the return spring drives the inner sleeve to move outwards relative to the code wheel, so that the clutch structure is separated.

[0010] There are various types of clutch structures. Preferably, the clutch structure includes a rib protruding from the outer circumferential wall of the inner sleeve and a keyway formed on the inner circumferential wall of the code wheel. The rib is arranged along the circumference of the inner sleeve, and the keyway is arranged along the circumference of the code wheel. The paddle can drive the inner sleeve to move toward the inside of the code wheel so that the rib is engaged with the corresponding keyway. The reset spring can drive the inner sleeve to move toward the outside of the code wheel so that the rib is disengaged from the corresponding keyway. When the rib is engaged with the keyway, the inner sleeve and the code wheel rotate synchronously. When the rib is disengaged from the keyway, the code wheel can rotate relative to the inner sleeve. In this arrangement, the rib and the keyway can cooperate to make the inner sleeve rotate synchronously with the code wheel or make the code wheel rotate relative to the inner sleeve. When the rib is disengaged from the keyway, the code wheel can rotate relative to the inner sleeve, at which time the code can be set or the code wheel can be reset after the code is set. When the rib is engaged with the keyway, the code wheel and the inner sleeve can only rotate simultaneously, at which time the code can be entered.

[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 being larger than the outer diameter of the first boss, the ribs being circumferentially spaced on the outer circumferential wall of the first boss, and a notch being formed circumferentially on the second boss, and the toggle plate having a protrusion that matches the notch, and the protrusion being able to be inserted into the notch under the drive of the output shaft when aligned with the corresponding notch. With this arrangement, after the correct password is entered in the locked state, the inner sleeve and the password wheel rotate synchronously to a position where the notch is aligned with the protrusion, and the toggle lever, driven by the output shaft, can insert the protrusion into the corresponding notch to unlock.

[0012] In order to enable the output shaft to rotate before the cam and also drive the cam to rotate synchronously, a redundant groove is opened in the circumferential direction on the inner circumferential wall of the cam, and the redundant groove is arranged on the inner circumferential wall of the outer convex part 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] To limit the rotation of the output shaft, a second stopper is protruding from the outer peripheral wall of the output shaft, and a first and second stopper walls are formed inside the housing. In the locked state, the output shaft rotates until the second stopper abuts against the first stopper wall, causing the lock tongue to be in the 0° position. In the password setting state, the output shaft rotates until the second stopper abuts against the second stopper wall, causing the lock tongue to be in the 180° position. In the unlocked state, the lock tongue is in the 90° position. If the combination lock is installed vertically, the 0° and 180° positions are horizontal positions and in opposite directions, and the 90° position is the vertical position.

[0015] To facilitate assembly, the shell includes an upper cover and a lower cover that is 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, and the lower end of the output shaft extends downward from the lower cover. The locking tongue is arranged below the lower cover and is 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 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 combination lock between the locked state, the unlocked state and the password setting state. The operation is very convenient, and by installing a cam that matches the wheel shaft 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 shaft. During the relative axial movement of the wheel shaft and the inner sleeve, the combination wheel can be released and automatically reset. In addition, the combination wheel can be manually 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 according to an 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 after removing the upper cover;

[0020] Figure 4 for Figure 1 The 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 (with the lower cover and lock tongue removed);

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

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

[0024] Figure 8 for Figure 7 Exploded diagram of the output shaft and cam shown;

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

[0026] Figure 10 This is a partially exploded schematic diagram of a combination wheel assembly of a combination lock according to an embodiment of the present invention;

[0027] Figure 11Schematic diagram of the structure of the password lock according to an embodiment of the present invention (unlocked state);

[0028] Figure 12 for Figure 11 The schematic diagram of the structure of the password lock after removing the upper cover;

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

[0030] Figure 14 for Figure 11 A schematic diagram of the structure of the combination lock from another angle (with the lower cover and lock tongue removed);

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

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

[0033] Figure 17 for Figure 16 The schematic diagram of the structure of the password lock after removing the upper cover;

[0034] Figure 18 for Figure 16 A schematic diagram of the structure of the combination lock from another angle (with the lower cover and lock tongue removed);

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

[0036] Figure 20 Schematic diagram of the password structure of an embodiment of the present invention (password automatically cleared state);

[0037] Figure 21 for Figure 20 A schematic diagram of the structure of the combination lock from another angle (with the lower cover and lock tongue removed);

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

[0039] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0040] like Figures 1 to 6As shown, the combination lock of this embodiment includes a housing 1, on which are mounted major components, including a wheel combination assembly 2, a button assembly 3, a toggle plate 4, an output shaft 5, a lock tongue 6, a protrusion 7, a compression spring 8, and a drive block 9. The housing 1 includes an upper cover 11 and a lower cover 12. The lower cover 12 is removably mounted to the bottom of the upper cover 11. The main bodies of the wheel combination assembly 2 and the output shaft 5 are located within 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, while the lower end of the output shaft 5 extends downward from the lower cover 12. The lock tongue 6 is located below the lower cover 12 and mounted at the lower end of the output shaft 5. Rotating the rotating portion 56 drives the lock tongue 6 to rotate synchronously, thereby achieving unlocking and locking. To set or enter a password, pressing the button assembly 3 causes the combination wheel 23 of the wheel combination assembly 2 to rotate.

[0041] The toggle piece 4 is arranged inside the upper cover 11 to Figure 3 The direction indicated by the arrow A is forward, and the front 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 front end of the toggle plate 4 contacts the contact portions of different depths and moves axially back and forth relative to the wheel combination 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 along the circumferential direction with a large arc surface 51 with a larger radius, a small arc surface 52 with a smaller radius, and a groove 53 extending inward from the small arc surface and connecting the large and small arc surfaces. The large arc surface 51, the small arc surface 52, and the groove 53 form a contact portion for the paddle 4. In the locked state, the end of the paddle 4 abuts against the small arc surface 52. In the unlocked state, the end of the paddle 4 abuts against the large arc surface 51. In the password setting state, the end of the paddle 4 extends into the groove 53.

[0042] like Figure 10As shown, the combination lock has four wheel combination assemblies 2, which can be used to set a four-digit combination. Each wheel combination assembly 2 includes an axle 21, an inner sleeve 22, a combination wheel 23, a torsion spring 24, and a reset spring 25. The inner sleeve 22 and the combination wheel 23 are sleeved on the axle 21 and can rotate relative to the axle 21. The combination wheel 23 is also sleeved on the inner sleeve 22. The torsion spring 24 is sleeved on the axle 21. The two ends of the torsion spring 24 are respectively mounted on the housing 1 and the combination wheel 23 to keep the rotation of the combination wheel 23 in a state of reset and clearing. The reset spring 25 is sleeved on the axle 21 and is positioned between the combination wheel 23 and the inner sleeve 22 to keep the inner sleeve 22 in a state of moving outward, i.e., forward. The inner sleeve 22 of this embodiment is formed, axially from the inside out, with an inner sleeve body 221, a first boss 222, and a second boss 222. The outer diameter of the second boss 222 is larger than that of the first boss 222. Circumferentially spaced ribs 225 are formed on the outer circumferential wall of the first boss 222, and circumferentially spaced keyways 231 are formed on the inner circumferential wall of the code wheel 23. The ribs 225 and keyways 231 form a clutch mechanism. During operation, the paddle 4 drives the inner sleeve 22 toward the interior of the code wheel 23, causing the ribs 225 to engage with the corresponding keyways 231. At this point, the clutch mechanism is engaged, and the inner sleeve 22 and code wheel 23 rotate synchronously. The return spring 25 drives the inner sleeve 22 toward the exterior of the code wheel 23, disengaging the ribs 225 from the corresponding keyways 231. At this point, the clutch mechanism is disengaged, allowing the code wheel 23 to rotate relative to the inner sleeve 22 to set the code.

[0043] The second boss 222 of the inner sleeve 22 is circumferentially defined with notches 226, with each inner sleeve 22 having one notch 226. The paddle 4 has a protrusion 41 that mates with the corresponding notch. When the clutch structure is engaged, the inner sleeve 22 and the code wheel 23 rotate synchronously, i.e., the position of the notch 226 also moves circumferentially, while the paddle 4 can only move axially and cannot rotate circumferentially. Therefore, when the inner sleeve 22 rotates until the notch 226 is aligned with the protrusion 41, the paddle 4 can be driven inwardly relative to the inner sleeve 22 by the output shaft 5, and then 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 piece 4 maintains contact with the inner sleeve 22, and the front end of the toggle piece 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 piece 4 abuts against the contact parts of different depths, the inner sleeve 22 can move axially forward and backward.

[0045] Cam 7 is mounted on the output shaft 5. A redundant groove 71 is circumferentially defined on the inner circumferential wall of cam 7. Groove 71 is located on the inner circumferential wall of the cam 7's outer protrusion. A first stopper 54 is protruding from the outer circumferential wall of the output shaft 5. The first stopper 54 moves within the redundant groove 71 as the output shaft 5 rotates. When the first stopper 54 abuts the end surface of the redundant groove 71, the output shaft 5 drives the cam 7 in synchronous rotation. Cam 7 is designed to engage with the axle 21 of the cipher wheel assembly 2. The front end of axle 21 abuts the circumferential surface of cam 7, and a compression spring 8 is mounted on the rear end of axle 21. The front end of compression spring 8 abuts axle 21, while the rear end of compression spring 8 abuts the upper cover 11. Under the action of compression spring 8, axle 21 maintains a tendency to press against cam 7. Consequently, as cam 7 rotates, axle 21 can move axially back and forth by contacting the various concave and convex circumferential surfaces of cam 6.

[0046] The concave-convex surface design of cam 7 and the different depths of contact areas on output shaft 5 create a time difference between the axial movement of inner sleeve 22 and axle 21, driven by both cam 7 and output shaft 5. This time difference allows the code wheel 23 to be released and automatically reset during the relative axial movement of axle 21 and inner sleeve 22. The specific principle is as follows.

[0047] like Figure 10As shown, the limiting block 211 is mounted on the wheel shaft 21, and the mounting structure is that a mounting hole 212 is formed on the outer wall of the wheel shaft 21, a spring 213 is mounted on the bottom of the mounting hole 212, the bottom of the limiting block 211 extends into the mounting hole 212 and abuts against the spring 213, and the head of the limiting block 211 is exposed on the outer wall of the wheel shaft 21, so that the limiting block 211 can be always connected on the wheel shaft 21. The inner peripheral wall of the password wheel 23 is formed with the password wheel limiting slot 231 extending in the axial direction, the inner peripheral wall of the inner sleeve 22 is formed with the inner sleeve limiting slot 224 extending in the axial direction, the password wheel 23 is sleeved on the inner sleeve 22, and the password wheel limiting slot 231 and the inner sleeve limiting slot 224 are axially staggered with each other. In the engaged state of the clutch structure of the password wheel 23 and the inner sleeve 22, the password wheel 23 and the inner sleeve 22 can keep synchronous rotation. When the limiting block 211 is limited on the password wheel limiting slot 213 or the inner sleeve limiting slot 224, the resistance generated by the limiting block 211 is greater than the torsion of the torsion spring 24, and the limiting block 211 prevents the password wheel 23 from being reset, but when the user presses the button assembly to set the password or input the password, the pressing force can overcome the limitation of the limiting block on the password wheel or the inner sleeve, and then the password wheel is smoothly rotated. In the embodiment, in the rotation process of the output shaft 5, specifically in the process of turning from the unlocking state to the locking state, under the common driving of the cam 7 and the output shaft 5, the time difference between the inner sleeve 22 return and the wheel shaft 21 return actions is generated, the inner sleeve 22 and the wheel shaft 21 are axially relatively moved, when the limiting block 211 moves to the password wheel limiting slot 231 and the inner sleeve limiting slot 224, the limiting block 211 releases the limitation on the password wheel 23 and the inner sleeve 22, at this time, the password wheel 23 can be reset under the action of the torsion spring 24.

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

[0049] The outer peripheral wall of the output shaft 5 is protrudingly provided with the second stop block 55, and the lower cover 12 is formed with the first limiting wall 121 and the second limiting wall 122. Figure 3 As shown, in the locking state, the output shaft 5 is rotated to the state that the second stop block 55 abuts against the first limiting wall 121, so that the locking tongue 6 is in the 0° position. Figure 17As shown, in the password setting state, the output shaft 5 rotates until the second stopper 55 abuts the second limiting wall 122, causing the lock tongue 6 to be in the 180° position. In the unlocked state, the lock tongue 6 is in the 90° position. Assuming the password lock is installed vertically, the 0° and 180° positions are horizontal positions, and the 90° position is the vertical position. In addition, limiting notches 57 are provided at intervals on the outer peripheral wall of the output shaft 5. An elastic locking pin 10 is installed on the lower cover 12. When the password lock is in different states, the elastic locking pin 10 is inserted into the corresponding limiting notch 57 to limit the output shaft 5. Rotating the output shaft 5 causes the elastic locking pin 10 to disengage 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 the locked state, and the lock tongue 6 is at the 0° position. The toggle piece 4 is against the small arc surface 52, that is, the toggle piece 4 is in the middle position, and the wheel shaft 21 is 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 to the inner sleeve limit groove 224 of the inner sleeve 22, and the inner sleeve 22 is engaged with the code wheel 23. When unlocking, the button assembly 3 is pressed. Each time the button assembly 3 is pressed, the inner sleeve 22 and the code wheel 23 rotate synchronously by one wheel number. When the correct code is entered, the four notches 226 of the inner sleeve 22 are all aligned in a straight line and aligned with the corresponding protrusions 41 of the paddle 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 stop 54 of the output shaft 5 is located at the rear end of the redundant groove 71 of the cam 7. Therefore, when the output shaft 5 rotates from the locked state to the unlocked state, the cam 7 initially remains stationary. Only when the first stop 54 contacts the front end of the redundant groove 71 does the output shaft 5 begin to drive the cam 7 to rotate synchronously. In this embodiment, the cam 7 starts to rotate only after the output shaft 5 rotates to the point where the large arc surface 51 abuts against the toggle rod 4, and gradually causes the wheel axle 21 to transition from contact with the concave surface of the cam 7 to contact with the convex surface. That is, before the wheel axle 21 retreats, the toggle rod 4 has already retreated, that is, the inner sleeve 22 has already retreated, and the distance between the inner sleeve limiting groove 224 and the password 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 password wheel 23 when passing between the inner sleeve limiting groove 224 and the password wheel limiting groove 231, and will not reset the password 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 piece 4 abuts against the large arc surface 51, that is, the toggle piece 4 moves backward to the maximum position, and the wheel shaft 21 abuts against the convex surface of the cam 7, that is, the wheel shaft 21 moves backward to the maximum position. At this time, Figure 15 As shown, the limiting block 211 is limited on the code wheel limiting 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, the combination lock is in the password setting state, and the lock tongue 6 is in the 180° position. The toggle piece 4 is inserted into the groove 53, that is, the toggle piece 4 moves forward to the maximum position, and the wheel shaft 21 still abuts against the convex surface of the protrusion 7, that is, the wheel shaft 21 moves backward to the maximum position. At this time, Figure 19 As shown, the limiting block 211 is still limited on the code wheel limiting groove 231 of the code wheel 23. At the same time, under the action of the return 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 protrusions 41 are still located in the corresponding notches 226. When setting the code, when the button assembly 3 is pressed, the code wheel 23 rotates, but the inner sleeve 22 does not rotate.

[0054] like Figures 20 to 22 As shown, after the password is set, the output shaft 5 is rotated in the reverse direction, that is, the output shaft 5 rotates in the reverse direction from the current 180° position to the initial 0° position. Along the reverse rotation direction of the output shaft 5, the first stop 54 is located at the rear end of the redundant groove 71. Therefore, when the output shaft 5 rotates in the reverse direction, the cam 7 initially remains stationary. Only when the first stop 54 abuts the front end of the redundant groove 71 does the output shaft 5 begin to drive the cam 7 in the reverse direction. When the output shaft 5 rotates in the reverse direction until the paddle 4 abuts the small arc surface 52, the inner sleeve 22 has moved backward relative to the password wheel 23, that is, the rib 225 has been engaged in the keyway 231, and the inner sleeve 22 can rotate synchronously with the password wheel 23. In this embodiment, during the rotation of the lock tongue 6 from 90° to 0°, after the output shaft 5 rotates in the opposite direction until the paddle 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. Driven by 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, i.e., asynchronous movement. Figure 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 cleared and 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 unlocking is achieved at the 90° position.

[0055] In the present specification and claims, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Because the embodiments disclosed herein can be arranged in various orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A combination lock, comprising a housing (1), a wheel combination assembly (2), a button assembly (3), a toggle plate (4) and an output shaft (5) mounted on the housing (1), the wheel combination assembly (2) comprising a wheel shaft (21), an inner sleeve (22) and a combination wheel (23), the inner sleeve (22) and the combination wheel (23) being mounted on the wheel shaft (21) and being rotatable relative to the wheel shaft (21), the button assembly (3) being used to toggle the combination wheel (23) to rotate, and a lock tongue (6) being mounted on the output end of the output shaft (5) and rotating synchronously with the output shaft (5), characterized in that: The outer peripheral 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 password lock between a locked state, an unlocked state and a password setting state. A cam (7) for cooperating with the wheel shaft (21) is also installed on the output shaft (5). One end of the wheel shaft (21) abuts against the elastic member, and the other end of the wheel shaft (21) abuts against the peripheral surface of the cam (7). During the rotation of the output shaft (5), the inner sleeve (22) and the wheel shaft (21) generate axial relative movement, so that the password wheel (23) is reset.

2. The combination lock according to claim 1, characterized in that: A limiting block (211) is installed on the wheel shaft (21); the inner peripheral wall of the cipher wheel (23) is formed with a cipher wheel limiting groove (231) extending in the axial direction; the inner peripheral wall of the inner sleeve (22) is formed with an inner sleeve limiting groove (224) extending in the axial direction; the cipher wheel (23) is sleeved on the inner sleeve (22); the cipher wheel limiting groove (231) and the inner sleeve limiting groove (224) are staggered in the axial direction; during the rotation of the output shaft (5), the limiting block (211) moves between the cipher wheel limiting groove (231) and the inner sleeve limiting groove (224) through the axial relative movement of the inner sleeve (22) and the wheel shaft (21), thereby releasing the limitation of the cipher wheel (23) and the inner sleeve (22) and resetting the cipher 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 against the wheel axle (21), and the other end of the compression spring (8) is against 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 password wheel (23) and the inner sleeve (22) to release the limit on the password wheel (23) and the inner sleeve (22).

4. The combination lock according to claim 2, characterized in that: A mounting hole (212) is formed on the outer wall of the wheel 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 wheel axle (21).

5. The combination lock according to claim 2, characterized in that: The word wheel password assembly (2) further comprises a torsion spring (24) and a reset spring (25); a clutch structure is provided between the password wheel (23) and the inner sleeve (22); the torsion spring (24) is sleeved on the wheel shaft (21); the two ends of the torsion spring (24) are respectively mounted on the housing (1) and the password wheel (23) so that the password wheel (23) maintains a tendency to reset after rotation; the reset spring (25) is sleeved on the wheel shaft (21) and abuts against the password wheel (23) and the inner sleeve (22), so that the inner sleeve (22) always maintains a tendency to move outward so that the clutch structure is separated; when the clutch structure is separated, the password wheel (23) can rotate relative to the inner sleeve (22); when the clutch structure is engaged, the password 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 groove (232) formed on the inner peripheral wall of the password wheel (23), wherein the convex rib (225) is arranged along the circumference of the inner sleeve (22), and the key groove (232) is arranged along the circumference of the password wheel (23), and the paddle (4) can drive the inner sleeve (22) to move toward the inside of the password wheel (23) so that the convex rib (225) is engaged in the corresponding key groove (232). ), the reset spring (25) can drive the inner sleeve (22) to move toward the outside of the code wheel (23) to disengage the rib (225) from the corresponding key slot (232); when the rib (225) is stuck in the key slot (232), the inner sleeve (22) and the code wheel (23) rotate synchronously; when the 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 from the inside to the outside along the axial direction. 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 opened in the circumferential direction of the second boss (223). The shifting piece (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 it is 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 provided on the inner peripheral wall of the outer convex portion of the cam (7). A first stopper (54) is 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 face 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 inwardly extending 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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