Coded lock

Abstract

The utility model discloses a coded lock. The coded lock comprises a shell, a coded disc assembly, a clutch assembly and an operation assembly, wherein the coded disc assembly, the clutch assembly and the operation assembly are connected into the shell; the password disk assembly comprises a plurality of outer password disks and inner password disks correspondingly meshed with the outer password disks. The clutch assembly comprises a clutch piece, a clutch block connected to the clutch piece, a clutch gear connected to the clutch block, a driven gear meshed with the clutch gear and a shifting piece connected to the driven gear. The operation assembly comprises a driving rotating shaft, an adapter connected to the driving rotating shaft, a gear disc connected to the adapter and a rotatable handle connected to the front end of the driving rotating shaft. When a correct password is input into the password disc assembly, the clutch piece acts, the clutch gear moves forwards to be meshed with the gear disc, the handle is rotated, and the shifting piece is synchronously driven to unlock the lock body.

Description

Technical Field

[0001] This utility model relates to the field of intelligent combination lock technology, and in particular to a combination lock with an aesthetically pleasing combination disc. Background Technology

[0002] Currently available smart locks are equipped with a mechanical lock body for emergency unlocking. In case of electronic malfunction or power failure, a mechanical key is used to unlock the door. Existing mechanical key combination modules are bulky and aesthetically unappealing when integrated with smart locks. Smaller mechanical key combination modules are more vulnerable to security breaches and are cumbersome to operate. While smart lock users enjoy the convenience of electronic methods such as apps, electronic passwords, fingerprints, and card swipes, they often forget where they stored their spare emergency mechanical keys, making them difficult to find or requiring a lengthy search when needed, resulting in significant inconvenience. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a combination lock to solve the technical problem that the mechanical unlocking method of the existing combination lock is inconvenient to use.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An embodiment of this utility model provides a combination lock, which includes: a housing, a combination dial assembly, a clutch assembly, and an operating assembly connected within the housing;

[0006] The cipher disk assembly includes: a plurality of outer cipher disks and inner cipher disks that respectively engage with the outer cipher disks;

[0007] The clutch assembly includes: a clutch element, a clutch block connected to the clutch element, a clutch gear connected to the clutch block, a driven gear meshing with the clutch gear, and a paddle connected to the driven gear.

[0008] The operating components include: a drive shaft, an adapter connected to the drive shaft, a gear disk connected to the adapter, and a rotatable handle connected to the front end of the drive shaft.

[0009] When the correct password is entered into the keypad assembly, the clutch is activated, the clutch gear moves forward to engage with the gear plate, and the handle is rotated, which in turn drives the paddle to open the lock body.

[0010] The outer cipher disk has a radially protruding protrusion on its inner ring edge, and the inner cipher disk has a radially extending groove on its back.

[0011] When the password input of the password disk assembly is correct, the clutch component sinks into the groove, and the clutch gear is also provided with an elastic element along its axial direction. The clutch component, the clutch block and the clutch gear can all reciprocate along the elastic force direction of the elastic element.

[0012] The inner cipher disk is connected to the mounting groove of the housing by a fixing piece. The inner surface of the outer cipher disk is provided with outer disk teeth in the axial direction, and the outer surface of the inner cipher disk is provided with inner disk teeth in the axial direction. The outer disk teeth mesh with the inner disk teeth.

[0013] The housing contains at least one set of elastic components, and the inner surface of the inner key disk is uniformly provided with recessed holes. The elastic components include a steel ball and a spring, with the spring elastically abutting against the steel ball so that the steel ball is at least partially submerged in the recessed hole.

[0014] The operating component further includes a keypad clutch block, which is rotatably connected to the drive shaft. When rotating, the keypad clutch block can engage and disengage with the external keypad.

[0015] The combination lock further includes a combination modification component, which comprises a directional ring and a drive ring disposed between the outer combination plate and the inner combination plate. The directional ring and the drive ring are linked together. The inner ring surface of the drive ring is provided with an axially protruding boss, and the mounting groove of the housing is provided with a boss groove corresponding to the boss. When the drive ring is driven to rotate, the boss of the drive ring retracts from the boss groove, simultaneously lifting the directional ring, thereby pushing the outer combination plate away from the inner combination plate.

[0016] The drive ring is further provided with at least one set of elastic slider assemblies. The elastic slider assembly includes: a slider, a spring that elastically supports the slider, and a connecting shaft connected to the slider. The connecting shaft and the slider are controlled by the spring to reciprocate synchronously. The clutch block is provided with a clearance groove corresponding to the connecting shaft. When the password input is correct by the password disk assembly, the end of the connecting shaft is inserted into the clearance groove so that the drive ring can be operated.

[0017] The inner ring surface of the drive ring is also provided with the same number of raised steps as the elastic slider assembly, and the outer side of the slider abuts against the raised steps.

[0018] The slider is provided with a sliding buckle at its inner end, which is fastened to the inner edge of the outer keypad.

[0019] This utility model discloses a combination lock that adds a combination dial-type mechanical emergency lock structure to existing combination locks, allowing for emergency unlocking in case of power failure or smart lock malfunction. The combination dial-type mechanical lock is flush with the lock body, resulting in an aesthetically pleasing appearance. Compared to existing emergency unlocking methods such as mechanical keys, it is more convenient and simpler to use.

[0020] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the combination lock installed on the door according to an embodiment of the present invention.

[0022] Figure 2 and Figure 3 This is a schematic diagram of the overall structure of the combination lock from different perspectives according to an embodiment of the present invention.

[0023] Figure 4 This is a front structural diagram of the lifting mechanism of the combination lock according to an embodiment of the present utility model.

[0024] Figure 5 for Figure 4 The longitudinal sectional view shown.

[0025] Figure 6 and Figure 7 This is an exploded view of the combination lock's combination disk assembly from different perspectives, according to an embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of the clutch mechanism of the combination lock according to an embodiment of the present utility model.

[0027] Figure 9 for Figure 8 The exploded view of the portion mentioned.

[0028] Figure 10 This is a schematic diagram of the password modification component of the combination lock according to an embodiment of the present utility model.

[0029] Figure 11 for Figure 10 The exploded view of the portion mentioned.

[0030] Figure 12 This is a schematic diagram of the operation components of the combination lock according to an embodiment of the present invention.

[0031] Figure 13 for Figure 12 The exploded view of the portion shown.

[0032] Figure 14 This is a schematic diagram of the clutch assembly of the combination lock in the closed state according to an embodiment of the present invention.

[0033] Figure 15 This is a schematic diagram of the clutch assembly of the combination lock in the disengaged state according to an embodiment of the present invention.

[0034] Figure 16 This is a schematic diagram of the housing structure of the combination lock according to an embodiment of the present invention.

[0035] Figure 17 This is a schematic diagram of the drive ring portion of the combination lock according to an embodiment of the present invention.

[0036] Figure 18 and Figure 19 These are schematic diagrams showing the two states of the combination lock before and after changing the password in this embodiment.

[0037] Figure 20 This is a schematic diagram of the back structure of the combination lock in the password-changing state according to an embodiment of the present invention.

[0038] Figure 21 This is a cross-sectional view of the combination lock in the password-changing state according to an embodiment of the present invention.

[0039] Figure 22 This is a schematic diagram showing the engagement state of the outer combination lock and the slider in an embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] Currently available smart locks are equipped with a mechanical lock cylinder and lock body for emergency unlocking. In case of electronic malfunction or power failure, a mechanical key is used to unlock the door. Existing mechanical key combination modules are bulky and aesthetically unappealing when integrated with smart locks. Smaller mechanical key combination modules are easily cracked and cumbersome to operate. While smart lock users enjoy the convenience of electronic methods such as apps, electronic passwords, fingerprints, and card swipes, they often forget where they stored their spare emergency mechanical keys, making them difficult to find or requiring a long time to locate when needed, causing inconvenience. Therefore, based on the above needs, this embodiment provides a combination lock 100.

[0048] Please see Figures 1 to 22 This embodiment discloses a combination lock 100, which includes: a housing 10, a combination dial assembly 1, a clutch assembly 3 and an operation assembly 2 connected within the housing 10;

[0049] The password disk assembly 1 includes: a plurality of outer password disks 11, and a plurality of inner password disks 12 respectively engaged with the outer password disks 11;

[0050] The clutch assembly 3 includes: at least one clutch element 36, a clutch block 35 connected to the clutch element 36, a clutch gear 34 connected to the clutch block 35, a driven gear 33 meshing with the clutch gear 34, and a paddle 32 connected to the driven gear 33.

[0051] The operating component 2 includes: a drive shaft 21, an adapter 24 connected to the drive shaft 21, a gear disk 25 connected to the adapter 24, and a rotatable handle 22 connected to the front end of the drive shaft 21.

[0052] When the correct password is entered into the keypad assembly 1, the clutch 36 is activated, causing the clutch gear 34 to move forward and engage with the gear disk 25. The handle 22 is then rotated, which in turn drives the paddle 32 to open the lock body.

[0053] Compared to existing emergency unlocking structures using mechanical keys, the combination lock 100 in this embodiment integrates a combination disc-type emergency combination lock on the lock body. In case of an emergency, the combination disc assembly 1 and operation assembly 2 connected to the lock body can be manually operated to unlock the lock. This eliminates the need for the user to store a mechanical key in advance, greatly improving ease of use. Furthermore, the combination disc-type combination lock is integrated into the lock body, resulting in a more aesthetically pleasing overall design.

[0054] It should be noted that the housing 10 of the combination lock 100 in this embodiment also integrates a commonly used smart lock cylinder, such as a fingerprint lock, a face recognition lock, an input password lock, a card swipe password lock, etc. The housing 10 also includes one or more combinations of the above-mentioned smart lock cylinders.

[0055] Please refer to it again. Figure 2 , Figure 6 and Figure 7 After the outer cipher disks 11 are assembled, a flat plane is formed on their outer surfaces. In this embodiment, the outer cipher disks 11 include a first outer cipher disk 111, a second outer cipher disk 112, and a third outer cipher disk 113. The first outer cipher disk 111, the second outer cipher disk 112, and the third outer cipher disk 113 are coaxially nested, and their structures are identical, differing only in diameter. After the first outer cipher disk 111, the second outer cipher disk 112, and the third outer cipher disk 113 are nested together, they can rotate in unison, with each outer cipher disk representing one cipher. It is understood that the number of outer cipher disks 11 and inner cipher disks 12 can be increased or decreased as needed, and is not limited to the three sets of ciphers in this embodiment.

[0056] The outer cipher disk 11 has a radially protruding protrusion 114 on its inner ring edge, and the inner cipher disk 12 has a radially extending groove 121 on its back. After the first outer cipher disk 111, the second outer cipher disk 112, and the third outer cipher disk 113 are nested and connected, adjacent outer cipher disks are linked together by the protrusion 114.

[0057] In another embodiment, the number of clutches 36 may be the same as the number of inner password disks 12, and may also be a single clutch that can be simultaneously inserted into the back groove of multiple inner password disks 12.

[0058] The inner surfaces of the first outer code disk 111, the second outer code disk 112, and the third outer code disk 113 are all provided with axially protruding outer disk teeth 115, and the corresponding outer surface of the inner code disk 12 is provided with axially protruding inner disk teeth 122. The outer disk teeth 115 on the outer code disk 11 and the inner disk teeth 122 on the inner code disk 12 mesh with each other.

[0059] In this embodiment, the outer cipher disk 11 is provided with three sets of cipher disks, and the corresponding inner cipher disk 12 is also provided with three sets of ring teeth 122. The two are respectively meshed to achieve linkage rotation.

[0060] Please refer to it again. Figure 14 and Figure 15 When the password input of the keypad assembly 1 is correct, the clutch 36 sinks into the groove 121. The clutch gear 34 is also provided with an elastic element 37 along its axial direction. The clutch 36, the clutch block 35, and the clutch gear 34 can all reciprocate along the elastic force direction of the elastic element 37. As shown in the figure, the elastic force direction of the elastic element 37 is in the horizontal direction. The elastic element 37 is a spring. The back of the clutch gear 34 is also provided with an axially recessed connecting annular groove 341, and the elastic element 37 is installed in the annular groove 341.

[0061] Both the clutch gear 34 and the driven gear 33 are installed inside a clutch cover 31, which is connected to the housing 10. The clutch component 36 and the clutch block 35 can be either separate or integrated.

[0062] The inner password disk 12 is connected to the mounting groove of the housing 10 by a fixing piece 13. The inner disk surface of the outer password disk 11 is provided with outer disk teeth 115 in the axial direction, and the outer disk surface of the inner password disk 12 is provided with inner disk teeth 122 in the axial direction. The outer disk teeth 115 mesh with the inner disk teeth 122.

[0063] Please refer to it again. Figure 7 The housing 10 contains at least one set of elastic components. The inner surface of the inner cipher disc 12 is uniformly provided with recessed holes 123. Each elastic component includes a steel ball 102 and a spring 103. The spring 103 elastically abuts against the steel ball 102, causing the steel ball 102 to at least partially sink into the recessed hole 123. Specifically, the housing 10 contains a mounting groove that aligns with the recessed hole 123 on the back of the inner cipher disc 12. Both the steel ball 102 and the spring 103 are disposed within the mounting groove, with the steel ball 102 partially sinking into the recessed hole 123, thus providing a better tactile feedback when the inner cipher disc 12 rotates.

[0064] like Figure 12 As shown, the operating component 2 also includes a keypad clutch block 23, which is rotatably connected to the drive shaft 21. When rotating, the keypad clutch block 23 can engage and disengage with the outer keypad 11. During emergency unlocking of the keypad component 1, the handle 22 can be lifted and rotated by hand, simultaneously driving the outer keypad 11 via the keypad clutch block 23, thus achieving a more effortless operation.

[0065] Please refer to it again. Figure 10 and Figure 11 The combination lock 100 also includes a combination lock modification component 4, which includes a directional ring 41 and a drive ring 42 disposed between the outer combination lock 11 and the inner combination lock 12. The directional ring 41 and the drive ring 42 are linked together. The inner ring surface of the drive ring 42 is provided with an axially protruding boss 423. The mounting groove of the housing 10 is provided with a boss groove 106 corresponding to the boss 423. When the drive ring 42 is driven to rotate, the boss 423 of the drive ring 42 exits from the boss groove 106, and simultaneously lifts the directional ring 41, so as to push the outer combination lock 11 away from the inner combination lock 12, thereby changing the outer combination lock 11 and the inner combination lock 12 from an engaged state to a disengaged state. At this time, the outer combination lock 11 can be manually rotated to change the combination.

[0066] Please refer to it again. Figures 16 to 21 When modifying the password, the password modification component 4 needs to ensure that the password input by the password disk component 1 is correct. Therefore, the drive ring 42 is also provided with at least one set of elastic slider components 40. The elastic slider component 40 includes: a slider 43, a spring 44 that elastically supports the slider, and a connecting shaft 45 connected to the slider 43. The connecting shaft 45 and the slider 43 are controlled by the spring 44 to move back and forth synchronously. The clutch block 35 is provided with a clearance groove 351 (352) corresponding to the connecting shaft 45. When the password input by the password disk component 1 is correct, the end of the connecting shaft 45 is inserted into the clearance groove 351 (352), so that the drive ring 42 can be operated to separate the inner password disk 12 from the outer password disk 11.

[0067] like Figure 20 As shown, in this embodiment, the elastic slider assembly 40 is provided in two sets and is arranged symmetrically from left to right. The slider 43 and the spring 44 are installed in the horizontal direction. The connecting shaft 45 is connected to the spring 44 at an angle. The spring 44 drives the slider 43 to move left and right, and synchronously drives the connecting shaft 45 to move so that it inserts into the clearance groove 351 (352) or exits from the clearance groove 351 (352).

[0068] The inner ring surface of the drive ring 42 is axially provided with the same number of raised steps 422 as the elastic slider assembly 40, and the outer side of the slider 43 abuts against the raised steps 422. The clutch block 35 is controlled by the clutch member 36, which is controlled by the password disk assembly 1. When the password is entered incorrectly into the password disk assembly 1, the clutch member retracts, and at this time the end of the connecting shaft 45 cannot be inserted into the clearance groove 351 (352). Correspondingly, the elastic slider assembly 40 is limited, and the slider 43 cannot move left or right. At this time, the drive ring 42 cannot rotate, and the corresponding directional ring 41 will not rotate in conjunction. At this time, the password disk assembly 1 cannot change the password.

[0069] The directional ring 41 has a locking protrusion 411 on its ring surface, and the drive ring 42 has a corresponding locking groove 421 on its ring surface. The two are linked by the locking protrusion 411 that is locked into the locking groove 421.

[0070] The outer side of the drive ring 42 is also provided with some external teeth 424, and the outer side of the drive ring 42 is also provided with a secondary gear 46. The secondary gear 46 meshes with the external teeth 424. The secondary gear 46 allows the user to operate the drive ring 42 from outside the housing 10, thereby realizing password modification.

[0071] like Figure 16 The bottom of the mounting groove of the housing 10 is also provided with a limiting groove 105, and the directional ring 41 is provided with a corresponding directional protrusion. When the driving ring 42 rotates, it drives the directional ring 41 to rise axially.

[0072] Please see Figures 18 to 21 , Figure 18 This is a schematic diagram showing the state of the internal components of the password disk component 1 before the password is changed. Figure 19 This diagram illustrates the state of the internal components when the password is changed. After the password is changed, simply press down on the outer password disk 11 to reset it.

[0073] Please refer to it again. Figure 22 The inner end of the slider 43 is also provided with a sliding buckle 431, which is engaged with the inner edge of the outer password disk 11, specifically at the inner edge 1111 of the first outer password disk 111. The engagement of the slider 43 with the outer password disk 11 increases the difficulty of externally forcibly disassembling the password disk assembly 1, thereby improving security.

[0074] This embodiment of the combination lock adds a combination dial-type mechanical emergency lock structure to the existing combination lock, allowing for emergency unlocking in case of power failure or smart lock malfunction. The combination dial-type mechanical lock is flush with the lock body, resulting in an aesthetically pleasing design. Compared to existing emergency unlocking methods such as mechanical keys, it is more convenient and simpler to use.

[0075] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A combination lock, characterized in that, include: A housing, and a combination lock assembly, a clutch assembly, and an operating assembly connected within the housing; The cipher disk assembly includes: a plurality of outer cipher disks and inner cipher disks that respectively engage with the outer cipher disks; The clutch assembly includes: at least one clutch element, a clutch block connected to the clutch element, a clutch gear connected to the clutch block, a driven gear meshing with the clutch gear, and a paddle connected to the driven gear. The operating components include: a drive shaft, an adapter connected to the drive shaft, a gear disk connected to the adapter, and a rotatable handle connected to the front end of the drive shaft. When the correct password is entered into the keypad assembly, the clutch is activated, the clutch gear moves forward to engage with the gear plate, and the handle is rotated, which in turn drives the paddle to open the lock body.

2. The combination lock according to claim 1, characterized in that, The inner ring edge of the outer cipher disk is also provided with a radially protruding protrusion, and the back of the inner cipher disk is also provided with a radially extending groove.

3. The combination lock according to claim 2, characterized in that, When the password input is correct, the clutch sinks into the groove. The clutch gear is also provided with an elastic element along its axial direction. The clutch, the clutch block and the clutch gear can all reciprocate along the elastic force direction of the elastic element.

4. The combination lock according to claim 1, characterized in that, The inner cipher disk is connected to the mounting groove of the housing by a fixing piece. The inner surface of the outer cipher disk is provided with outer disk teeth in the axial direction, and the outer surface of the inner cipher disk is provided with inner disk teeth in the axial direction. The outer disk teeth mesh with the inner disk teeth.

5. The combination lock according to claim 4, characterized in that, The housing contains at least one set of elastic components. The inner surface of the inner key disk is uniformly provided with recessed holes. The elastic components include a steel ball and a spring. The spring elastically abuts against the steel ball, causing the steel ball to sink at least partially into the recessed hole.

6. The combination lock according to claim 1, characterized in that, The operating component also includes a keypad clutch block, which is rotatably connected to the drive shaft. When the keypad clutch block rotates, it can engage and disengage with the external keypad.

7. The combination lock according to any one of claims 1 to 6, characterized in that, The combination lock also includes a combination modification component, which includes a directional ring and a drive ring disposed between the outer combination plate and the inner combination plate. The directional ring and the drive ring are linked together. The inner ring surface of the drive ring is provided with an axially protruding boss. The mounting groove of the housing is provided with a boss groove corresponding to the boss. When the drive ring is driven to rotate, the boss of the drive ring retracts from the boss groove, and simultaneously lifts the directional ring, thereby pushing the outer combination plate away from the inner combination plate.

8. The combination lock according to claim 7, characterized in that, The drive ring is also provided with at least one set of elastic slider assemblies. The elastic slider assembly includes: a slider, a spring that elastically supports the slider, and a connecting shaft connected to the slider. The connecting shaft and the slider are controlled by the spring to reciprocate synchronously. The clutch block is provided with a clearance groove corresponding to the connecting shaft. When the password input is correct by the password disk assembly, the end of the connecting shaft is inserted into the clearance groove so that the drive ring can be operated.

9. The combination lock according to claim 8, characterized in that, The inner ring surface of the drive ring is also provided with the same number of raised steps as the elastic slider assembly, and the outer side of the slider abuts against the raised steps.

10. The combination lock according to claim 8, characterized in that, The inner end of the slider is also provided with a sliding buckle, which is fastened to the inner edge of the outer keypad.

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