Mechanical coded lock

Abstract

The invention relates to the technical field of locks, and discloses a mechanical coded lock which comprises a bottom plate and a shell, an upper support is fixedly connected to the upper surface of the bottom plate, a lower support is fixedly connected to the inner wall of the shell, a rotary knob is rotatably connected to the interior of the shell, and a rotating frame is embedded in the rotary knob; a first springback mechanism is arranged in the rotating frame, a limiting frame is fixedly connected into the shell and connected with the first springback mechanism, a limiting shaft is slidably connected to the outer wall of the rotating frame, and the outer wall of the limiting shaft is slidably connected to the outer wall of the upper support and the outer wall of the lower support. Through the synergistic effect of the limiting shaft and the unlocking mechanism, accurate locking and unlocking control is achieved, when the unlocking mechanism is in an open state, the rotating frame can rotate freely, and rapid unlocking is achieved; and when the unlocking mechanism is in a closed state, the limiting shaft limits rotation of the rotating frame, stable locking of the coded lock is ensured, the unlocking efficiency is improved, and the safety of the lock is further enhanced.

Description

Technical Field

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

[0002] With the continuous improvement of people's attention to the security of property, mechanical combination locks, as an important security protection tool, are widely used in various scenarios, such as suitcases, cabinets, doors and windows, etc. However, traditional mechanical combination locks generally have problems of insufficient security performance and are easily cracked by violence or opened technically.

[0003] The internal structures of some combination locks are simple, and the rotating parts are easily damaged by external forces; the limiting structures of some combination locks are single, and the passwords are easily deduced or the tools are used to turn them; there are also some unlocking mechanisms of combination locks lacking flexibility and it is difficult to meet the requirements of different users for the number and complexity of passwords. As a result, in the prior art, the linkage structure and the limiting structure often exist independently, or only have a simple linkage, and there may be insufficient security. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a mechanical combination lock, which solves the problem that in the prior art, the linkage structure and the limiting structure often exist independently, or only have a simple linkage, and there may be insufficient security.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A mechanical combination lock includes a bottom plate and a housing. The upper surface of the bottom plate is fixedly connected with an upper bracket, the inner wall of the housing is fixedly connected with a lower bracket, a knob is rotatably connected inside the housing, a rotating frame is embedded inside the knob, a first return mechanism is arranged inside the rotating frame, a limiting frame is fixedly connected inside the housing, the limiting frame is connected with the first return mechanism, a limiting shaft is slidably connected to the outer wall of the rotating frame, the outer wall of the limiting shaft is slidably connected to the outer walls of the upper bracket and the lower bracket, a second return mechanism and an unlocking mechanism are arranged on the outer wall of the limiting shaft, a connecting block is fixedly connected to the lower surface of the limiting shaft, the outer wall of the connecting block is rotatably connected inside the bottom plate, a rotating plate is arranged on the outer wall of the connecting block, and a buckle assembly and a positioning assembly are arranged on the outer walls of the bottom plate and the housing.

[0006] Through the above solution: The rotating frame, the connecting block and the rotating plate are designed into a multi-level linkage, and the limiting shaft, the second return mechanism and the unlocking mechanism are designed into multiple restrictions, forming a complex and mutually restrictive linkage limiting system. This design makes the unlocking process of the combination lock more complex and improves the security.

[0007] Preferably, the buckle assembly includes a sub-buckle, the sub-buckle is fixedly connected to the outer wall of the housing, a mother-buckle is fixedly connected to the outer wall of the bottom plate, and the sub-buckle is engaged with the mother-buckle.

[0008] Preferably, the positioning assembly comprises an insert block, an outer wall of the insert block is fixedly connected to the outer wall of the shell, a limiting hole is provided inside the bottom plate, and the outer wall of the insert block is slidably connected inside the limiting hole.

[0009] Preferably, the first rebound mechanism comprises a fixed frame, an outer wall of the fixed frame is fixedly connected to the inside of the rotating frame, a torsion spring is installed inside the fixed frame, and the outer wall of the torsion spring is connected to the limiting frame.

[0010] Preferably, the second rebound mechanism comprises a fixing plate, an outer wall of the fixing plate is fixedly connected to the outer wall of the limiting shaft, one end of a compression spring is fixedly connected to the outer wall of the fixing plate, and the other end of the compression spring is arranged inside the shell.

[0011] Preferably, the unlocking mechanism includes a limiting protrusion, the outer wall of the limiting protrusion is fixedly connected to the outer wall of the limiting shaft, the outer wall of the limiting protrusion is slidably connected to an unlocking sleeve, the outer wall of the unlocking sleeve is rotationally connected to the outer walls of the upper bracket and the lower bracket, and the outer wall of the unlocking sleeve is provided with an operating mechanism.

[0012] Preferably, the operating mechanism includes a rotating wheel, the inner wall of the rotating wheel is arranged on the outer wall of the unlocking sleeve, the outer wall of the rotating wheel is rotatably connected to the outer walls of the upper bracket and the lower bracket, the upper side of the rotating wheel is partially exposed to the interior of the outer shell, and the outer wall of the rotating wheel is provided with a digital marking, and the digital marking is protruding or recessed relative to the rotating wheel.

[0013] Preferably, the inner wall of the rotating plate is slidably connected with a connecting rod, the inner wall of the rotating plate is provided with a sliding hole, and the outer wall of the connecting rod is slidably connected to the inside of the sliding hole.

[0014] Preferably, a positioning column is fixedly connected to the lower surface of the bottom plate, and a circular hole is formed inside the positioning column.

[0015] Preferably, the rotating frame is provided with a groove at the contact point between the rotating frame and the limiting shaft, and an auxiliary slider is provided on the outer wall of the rotating frame. The auxiliary slider and the groove of the rotating frame form a smooth arc surface, the limiting shaft is pressed against the smooth arc surface, and the limiting shaft is provided with a smooth inclined surface.

[0016] Working principle: When the combination lock is in the locked state, the rotating frame is locked by the limit shaft and cannot rotate. The user turns the wheel exposed from the shell with his fingers to rotate the unlocking sleeve. Each wheel corresponds to a set of limit protrusions and unlocking sleeves. The user needs to rotate each wheel to the correct position according to the correct password so that the limit grooves of each set of unlocking sleeves are aligned with the corresponding limit protrusions. When the limit grooves of all unlocking sleeves are aligned with the limit protrusions, the unlocking mechanism is in the open state, the limit shaft can slide freely, and the lock is in the unlocking state;

[0017] When the unlocking mechanism is opened and the limit shaft can slide, the user turns the knob, which drives the rotating frame to rotate. The two connecting blocks on the lower surface of the rotating frame drive the rotating plate to rotate simultaneously, achieving unlocking. After unlocking, the user can pull open the box body and perform the required operations;

[0018] After the user finishes using it, release the knob. The rotating frame rotates counterclockwise under the restoring force of the torsion spring. Under the action of the compression spring, the limit shaft always remains in contact with the rotating frame and slides in its groove. When the rotating frame is fully reset, the limit shaft also returns to the inside of the groove of the rotating frame, re-locking the rotating frame, and the mechanical password lock automatically returns to the locked state. If the user needs to re-lock the mechanical password lock, the rotating wheel can be rotated continuously to misalign the limit groove of any set of unlocking sleeves with the limit protrusion. At this time, the unlocking mechanism is closed, the limit shaft cannot slide, and the rotating frame cannot rotate, and the mechanical password lock is re-locked.

[0019] The present invention provides a mechanical password lock. It has the following beneficial effects:

[0020] 1. Through the synergistic effect of the limit shaft and the unlocking mechanism, the present invention realizes precise locking and unlocking control. When the unlocking mechanism is in the open state, the limit shaft can slide, and the rotating frame can rotate freely, achieving rapid unlocking; while when the unlocking mechanism is in the closed state, the limit shaft restricts the rotation of the rotating frame, ensuring the stable locking of the mechanical password lock, improving the unlocking efficiency, and enhancing the security of the lock.

[0021] 2. Through the synergistic effect of the torsion spring and the compression spring, the present invention realizes the reliable reset of the rotating frame. When the rotating frame is rotated, the torsion spring stores angular energy. When the rotating frame is released, the torsion spring releases energy to drive the rotating frame to reset. At the same time, the compression spring pushes the fixed plate to slide, so that the limit shaft always remains in contact with the rotating frame, ensuring the smooth sliding of the limit shaft. This design not only improves the reliability of the lock but also extends the service life of the lock.

[0022] 3. The structure of the present invention can adopt a fully plasticized design, and all key components are made of high-strength plastic materials. This design not only reduces the production cost but also simplifies the production process and improves the production efficiency. And it is convenient to adopt a modular design. For example, the bottom plate and the outer shell are fixedly connected through a snap component and an insert limit hole structure, which is convenient for assembly and disassembly, and the internal parts can be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view of the present invention;

[0024] Figure 2 is a partial structural schematic diagram of the knob of the present invention;

[0025] Figure 3 is a partial structural schematic diagram of the sub-button of the present invention;

[0026] Figure 4 Schematic diagram of the partial structure of the torsion spring of the present invention;

[0027] Figure 5 Schematic diagram of the partial structure of the compression spring of the present invention;

[0028] Figure 6 Schematic diagram of the partial structure of the rotating frame of the present invention;

[0029] Figure 7 Schematic diagram of the partial structure of the runner of the present invention;

[0030] Figure 8 Schematic diagram of the partial structure of the limiting shaft of the present invention.

[0031] Wherein, 1, bottom plate; 2, outer shell; 3, upper bracket; 4, lower bracket; 5, knob; 6, rotating frame; 7, first return mechanism; 701, fixed frame; 702, torsion spring; 8, limiting shaft; 9, second return mechanism; 901, fixing plate; 902, compression spring; 10, unlocking mechanism; 1001, limiting protrusion; 1002, unlocking sleeve; 11, connecting block; 12, rotating plate; 13, buckle assembly; 1301, sub-buckle; 1302, mother-buckle; 14, positioning assembly; 1401, insertion block; 1402, limiting hole; 15, connecting rod; 16, sliding hole; 17, positioning column; 18, round hole; 19, limiting frame; 20, operating mechanism; 2001, runner; 2002, digital identifier; 21, auxiliary slider. Specific embodiments

[0032] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0033] Please refer to the attached Figure 1 - attached Figure 4, an embodiment of the present invention provides a mechanical password lock, which includes a bottom plate 1 and a housing 2. The upper surface of the bottom plate 1 is fixedly connected with an upper bracket 3, the inner wall of the housing 2 is fixedly connected with a lower bracket 4, a knob 5 is rotatably connected inside the housing 2, a rotating frame 6 is embedded inside the knob 5, a first elastic return mechanism 7 is arranged inside the rotating frame 6, a limiting frame 19 is fixedly connected inside the housing 2, the limiting frame 19 is connected to the first elastic return mechanism 7, a limiting shaft 8 is slidably connected to the outer wall of the rotating frame 6, the outer wall of the limiting shaft 8 is slidably connected to the outer walls of the upper bracket 3 and the lower bracket 4, a second elastic return mechanism 9 and an unlocking mechanism 10 are arranged on the outer wall of the limiting shaft 8, a connecting block 11 is fixedly connected to the lower surface of the limiting shaft 8, the outer wall of the connecting block 11 is rotatably connected inside the bottom plate 1, a rotating plate 12 is arranged on the outer wall of the connecting block 11, and a buckle assembly 13 and a positioning assembly 14 are arranged on the outer walls of the bottom plate 1 and the housing 2.

[0034] Specifically, the bottom plate 1 and the housing 2 jointly protect the internal structure. The housing 2 supports the rotation of the knob 5. The rotation of the knob 5 drives the rotation of the rotating frame 6. There are two connecting blocks 11 arranged on the lower surface of the rotating frame 6. The rotating frame 6 drives the connecting blocks 11 to rotate. An arc-shaped sliding groove is opened inside the bottom plate 1. The connecting blocks 11 pass through the arc-shaped sliding groove. The arc-shaped sliding groove supports and limits the rotation of the connecting blocks 11. The two connecting blocks 11 drive the rotating plate 12 to rotate simultaneously. By rotating the rotating plate 12, the lock is opened and closed. The upper bracket 3 and the lower bracket 4 can support and limit the sliding of the limiting shaft 8. The rotation of the rotating frame 6 is restricted by the sliding of the limiting shaft 8. The second elastic return mechanism 9 and the unlocking mechanism 10 jointly restrict the sliding of the limiting shaft 8. When the unlocking mechanism 10 is in the open state, the limiting shaft 8 can slide and the rotating frame 6 can rotate. When the unlocking mechanism 10 is in the closed state, the limiting shaft 8 cannot slide, and the rotation of the rotating frame 6 is restricted by the limiting shaft 8. At this time, the rotating frame 6 cannot rotate, thus closing the entire password lock.

[0035] Please refer to the atta Figure 2 , the buckle assembly 13 includes a sub-buckle 1301, the sub-buckle 1301 is fixedly connected to the outer wall of the housing 2, a mother-buckle 1302 is fixedly connected to the outer wall of the bottom plate 1, and the sub-buckle 1301 is engaged with the mother-buckle 1302.

[0036] Specifically, there are two groups of the sub-buckle 1301 and the mother-buckle 1302, which are respectively arranged on the left and right sides of the bottom plate 1 and the housing 2. By clamping the sub-buckle 1301 inside the mother-buckle 1302, the bottom plate 1 and the housing 2 can be fixedly connected.

[0037] Please refer to the atta Figure 2 , the positioning assembly 14 includes an insertion block 1401, the outer wall of the insertion block 1401 is fixedly connected to the outer wall of the housing 2, a limiting hole 1402 is opened inside the bottom plate 1, and the outer wall of the insertion block 1401 is slidably connected inside the limiting hole 1402.

[0038] Specifically, there are two sets of insertion blocks 1401 and limit holes 1402, which are respectively arranged on the front and rear sides of the bottom plate 1 and the outer shell 2. By aligning the insertion blocks 1401 with the limit holes 1402 and then inserting the insertion blocks 1401 into the interior of the limit holes 1402, the bottom plate 1 and the outer shell 2 can be aligned and closed, avoiding dislocation between the bottom plate 1 and the outer shell 2, and at the same time, it can cooperate with the buckle assembly 13 to connect the bottom plate 1 and the outer shell 2.

[0039] Please refer to the appendix Figure 4 , the first rebound mechanism 7 includes a fixed frame 701. The outer wall of the fixed frame 701 is fixedly connected to the interior of the rotating frame 6. A torsion spring 702 is installed inside the fixed frame 701, and the outer wall of the torsion spring 702 is connected to the limit frame 19.

[0040] Specifically, when the rotating frame 6 is rotated, the rotating frame 6 drives the torsion spring 702 to rotate through the fixed frame 701. At this time, due to the restriction of one end of the torsion spring 702 by the limit frame 19, the torsion spring 702 stores angular energy. When the rotating frame 6 is released, the torsion spring 702 releases energy to drive the rotating frame 6 to reset.

[0041] Please refer to the appendix Figure 5 - appendix Figure 6 , the second rebound mechanism 9 includes a fixing plate 901. The outer wall of the fixing plate 901 is fixedly connected to the outer wall of the limit shaft 8. One end of a compression spring 902 is fixedly connected to the outer wall of the fixing plate 901, and the other end of the compression spring 902 is arranged inside the outer shell 2.

[0042] Specifically, the compression spring 902 has a tendency to push the fixing plate 901 to slide, and the fixing plate 901 has a tendency to drive the limit shaft 8 to approach the rotating frame 6, so that the limit shaft 8 is always in contact with the rotating frame 6. When the rotating frame 6 resets and rotates and the torsion spring 702 rebounds, the compression spring 902 rebounds at the same time.

[0043] Please refer to the appendix Figure 7 - appendix Figure 8 , the unlocking mechanism 10 includes a limit protrusion 1001. The outer wall of the limit protrusion 1001 is fixedly connected to the outer wall of the limit shaft 8. An unlocking sleeve 1002 is slidably connected to the outer wall of the limit protrusion 1001. The outer wall of the unlocking sleeve 1002 is rotatably connected to the outer walls of the upper bracket 3 and the lower bracket 4, and an operating mechanism 20 is arranged on the outer wall of the unlocking sleeve 1002.

[0044] Specifically, multiple groups of limiting protrusions 1001 are provided, which are set according to the required number of password digits. One limiting protrusion 1001 cooperates with one unlocking sleeve 1002 to form one digit of the password. The upper bracket 3 and the lower bracket 4 can support and limit the rotation of the unlocking sleeve 1002. A limiting groove is provided inside the unlocking sleeve 1002. The upper bracket 3 and the upper bracket 3 can support the rotation of the unlocking sleeve 1002. When the limiting groove of the unlocking sleeve 1002 is aligned with the limiting protrusion 1001, at this time, the limiting protrusion 1001 and the unlocking sleeve 1002 can slide. When the limiting grooves of each group of limiting protrusions 1001 are aligned with the unlocking sleeve 1002, the unlocking mechanism 10 is in the open state, and the limiting shaft 8 can slide. When any group of limiting protrusions 1001 is misaligned with the limiting groove of the unlocking sleeve 1002, the unlocking mechanism 10 is in the closed state, and the limiting shaft 8 cannot slide.

[0045] Please refer to the appendix Figure 7 - appendix Figure 8 , the operating mechanism 20 includes a rotating wheel 2001. The inner wall of the rotating wheel 2001 is arranged on the outer wall of the unlocking sleeve 1002. The outer wall of the rotating wheel 2001 is rotatably connected to the outer walls of the upper bracket 3 and the lower bracket 4. The upper side part of the rotating wheel 2001 is exposed inside the housing 2. Digital markings 2002 are provided on the outer wall of the rotating wheel 2001, and the digital markings 2002 protrude or are recessed with respect to the rotating wheel 2001.

[0046] Specifically, a rotating wheel 2001 is arranged on the outer wall of the unlocking sleeve 1002. Only by rotating the rotating wheel 2001 can the unlocking sleeve 1002 be driven to rotate. The rotating wheel 2001 is exposed inside the housing 2 for convenient use. The digital markings 2002 protrude or are recessed, which can increase friction and facilitate the rotation of the rotating wheel 2001.

[0047] Please refer to the appendix Figure 1 and Figure 5 , a connecting rod 15 is slidably connected to the inner wall of the rotating plate 12. A sliding hole 16 is provided in the inner wall of the rotating plate 12, and the outer wall of the connecting rod 15 is slidably connected inside the sliding hole 16.

[0048] Specifically, a sliding hole 16 is provided inside the rotating plate 12, and the connecting rod 15 slides in the sliding hole 16. When the rotating frame 6 rotates, the connecting rod 15 can be driven to slide or rotate through the rotating plate 12. The connecting rod 15 can be used to connect the limit pin of the box body, thereby achieving the sealing of the box body.

[0049] Please refer to the appendix Figure 3 , a positioning column 17 is fixedly connected to the lower surface of the bottom plate 1, and a round hole 18 is provided inside the positioning column 17.

[0050] Specifically, the positioning column 17 and the round hole 18 are mainly used for positioning when fixing with environmental components, facilitating the installation of the bottom plate 1.

[0051] Please refer to the attached Figure 7 - Attachment Figure 8 , at the contact between the rotating frame 6 and the limiting shaft 8, the rotating frame 6 is provided with a groove, and the outer wall of the rotating frame 6 is provided with an auxiliary slider 21. The auxiliary slider 21 and the groove of the rotating frame 6 form a smooth arc surface, and the limiting shaft 8 abuts against this smooth arc surface. The limiting shaft 8 is provided with a smooth inclined surface.

[0052] Specifically, when the password lock is closed, the limiting shaft 8 abuts inside the groove of the rotating frame 6. When the rotating frame 6 starts to rotate, the limiting shaft 8 slides in the groove of the rotating frame 6. The limiting shaft 8 slides along the smooth arc surface formed by the auxiliary slider 21 and the rotating frame 6. The smooth inclined surface of the limiting shaft 8 gradually moves away from the center of the rotating frame 6. The protrusion of the auxiliary slider 21 can prevent the limiting shaft 8 from slipping off and provide sufficient travel for the sliding of the limiting shaft 8. When the rotating frame 6 is reset, the limiting shaft 8 returns to the inside of the groove of the rotating frame 6.

[0053] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical password lock, comprising a bottom plate (1) and a housing (2), characterized in that, The upper surface of the bottom plate (1) is fixedly connected with an upper bracket (3), the inner wall of the outer shell (2) is fixedly connected with a lower bracket (4), a knob (5) is rotatably connected inside the outer shell (2), a rotating frame (6) is embedded inside the knob (5), a first elastic return mechanism (7) is arranged inside the rotating frame (6), a limiting frame (19) is fixedly connected inside the outer shell (2), the limiting frame (19) is connected with the first elastic return mechanism (7), a limiting shaft (8) is slidably connected to the outer wall of the rotating frame (6), the outer wall of the limiting shaft (8) is slidably connected to the outer walls of the upper bracket (3) and the lower bracket (4), a second elastic return mechanism (9) and an unlocking mechanism (10) are arranged on the outer wall of the limiting shaft (8), a connecting block (11) is fixedly connected to the lower surface of the limiting shaft (8), the outer wall of the connecting block (11) is rotatably connected inside the bottom plate (1), a rotating plate (12) is arranged on the outer wall of the connecting block (11), and a snap component (13) and a positioning component (14) are arranged on the outer walls of the bottom plate (1) and the outer shell (2).

2. The mechanical combination lock according to claim 1, characterized in that, The snap component (13) includes a sub - buckle (1301), the sub - buckle (1301) is fixedly connected to the outer wall of the outer shell (2), a mother - buckle (1302) is fixedly connected to the outer wall of the bottom plate (1), and the sub - buckle (1301) is engaged with the mother - buckle (1302).

3. A mechanical combination lock according to claim 1, characterized in that, The positioning component (14) includes a plug (1401), the outer wall of the plug (1401) is fixedly connected to the outer wall of the outer shell (2), a limiting hole (1402) is formed inside the bottom plate (1), and the outer wall of the plug (1401) is slidably connected inside the limiting hole (1402).

4. A mechanical password lock according to claim 1, characterized in that, The first elastic return mechanism (7) includes a fixed frame (701), the outer wall of the fixed frame (701) is fixedly connected inside the rotating frame (6), a torsion spring (702) is installed inside the fixed frame (701), and the outer wall of the torsion spring (702) is connected with the limiting frame (19).

5. A mechanical combination lock according to claim 1, characterized in that, The second elastic return mechanism (9) includes a fixed plate (901), the outer wall of the fixed plate (901) is fixedly connected to the outer wall of the limiting shaft (8), one end of a compression spring (902) is fixedly connected to the outer wall of the fixed plate (901), and the other end of the compression spring (902) is arranged inside the outer shell (2).

6. A mechanical combination lock according to claim 1, characterized in that, The unlocking mechanism (10) includes a limiting protrusion (1001), the outer wall of the limiting protrusion (1001) is fixedly connected to the outer wall of the limiting shaft (8), an unlocking sleeve (1002) is slidably connected to the outer wall of the limiting protrusion (1001), the outer wall of the unlocking sleeve (1002) is rotatably connected to the outer walls of the upper bracket (3) and the lower bracket (4), and an operating mechanism (20) is arranged on the outer wall of the unlocking sleeve (1002).

7. A mechanical combination lock according to claim 6, characterized in that, The operating mechanism (20) includes a runner (2001). The inner wall of the runner (2001) is disposed on the outer wall of the unlocking sleeve (1002). The outer wall of the runner (2001) is rotatably connected to the outer walls of the upper bracket (3) and the lower bracket (4). The upper side portion of the runner (2001) is exposed inside the housing (2). A digital identifier (2002) is provided on the outer wall of the runner (2001), and the digital identifier (2002) protrudes or is recessed with respect to the runner (2001).

8. A mechanical password lock according to claim 1, characterized in that, A connecting rod (15) is slidably connected to the inner wall of the rotating plate (12). A sliding hole (16) is formed in the inner wall of the rotating plate (12), and the outer wall of the connecting rod (15) is slidably connected inside the sliding hole (16).

9. A mechanical cipher lock according to claim 1, characterized in that, A positioning post (17) is fixedly connected to the lower surface of the bottom plate (1), and a circular hole (18) is formed inside the positioning post (17).

10. A mechanical combination lock according to claim 1, characterized in that, At the contact of the rotating frame (6) and the limiting shaft (8), the rotating frame (6) is provided with a groove. An auxiliary slider (21) is provided on the outer wall of the rotating frame (6). The auxiliary slider (21) and the groove of the rotating frame (6) form a smooth arc surface, and the limiting shaft (8) abuts against the smooth arc surface. The limiting shaft (8) is provided with a smooth inclined surface.

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