A mechanical combination lock mechanism for concealing pins

Abstract

A mechanical combination lock mechanism with concealed pins includes a lock cylinder body, a lock cylinder moving body, a lock cylinder rotor, a key, magnetic pins, and non-magnetic pins. The magnetic and non-magnetic pins are enclosed within the lock cylinder body and the lock cylinder moving body, ensuring that the pins are always concealed. By configuring at least one magnetic pin and at least one non-magnetic pin at the joint surface of the lock cylinder body and the lock cylinder moving body, respectively, the interface between the at least one magnetic pin and its mating non-magnetic pin is flush with the joint surface of the lock cylinder body and the lock cylinder moving body. Combined with the key's configuration of a combination of empty teeth and magnetic teeth, the combination of this mechanical combination lock mechanism uses a ternary code, making it difficult to unlock illegally through permutation and combination. Furthermore, by detachably combining the key teeth with the key bar, it allows one key to open multiple locks and prevents unauthorized unlocking after someone finds the key.

Description

Technical Field

[0001] This invention relates to mechanical combination lock mechanisms, and more specifically to a mechanical combination lock mechanism for concealing pins. Background Technology

[0002] Since its invention, the mechanical pin tumbler lock has been favored by people and used in almost all kinds of anti-theft and security applications. It is reliable, durable, inexpensive, and easy to use. However, over time, many of its drawbacks have become increasingly apparent. First, the requirement of one key for each lock is inconvenient for people in today's society. With increasing social activities and security needs, many people carry large bunches of keys, which is not only cumbersome but also causes even greater problems if lost. Not only will many locks become unopenable, but for security reasons, the entire bunch must be replaced, which is both laborious and expensive. Secondly, more and more people are now offering locksmith services because lock picking techniques are simple to learn, and the tools used are easy to make and carry. This means that the mechanical pin tumbler locks currently in use are becoming largely ineffective. With societal development, burglary and robbery crimes are on the rise, and people's residences and offices urgently need more secure and reliable locks.

[0003] Currently, many companies and manufacturers are dedicated to developing fingerprint locks with higher security, and even retinal recognition locks. Some mature products have been launched, but they are not only expensive, but also easily damaged. The optical components that serve as the sensing window are easily scratched, and once scratched, they will not be able to recognize properly. In addition, all electronic products are less robust and reliable than purely mechanical products.

[0004] Patent 200320116635X discloses a self-concealing magnetic pin lock. It mainly consists of two rows of opposing pin holes radially formed in the lock body and cylinder. Magnetic pins are placed in these holes, with opposite pins having the same polarity. Utilizing the principle of like poles repelling, the magnetic pins are concealed within the pin holes, making them invisible in the keyhole of the lock cylinder. When an iron key is inserted into the keyhole, the key attracts the magnetic pins, thus unlocking the lock. This pin lock solves the problem of preventing technical unlocking to some extent, but it does not consider the aforementioned issues after the key is lost, or how to open multiple locks with a single key. Furthermore, when a key-like iron piece is inserted into the keyhole, the magnetic pins are attracted out by the iron piece, exposing the pin positions.

[0005] Patent 2004100513564 discloses an adjustable digital pin tumbler lock, which consists of a lock body, a lock cylinder, and a key. Its main features include a detachable key base and key teeth, a magnetic key tooth configuration, and corresponding magnetic pins on the lock cylinder. This pin tumbler lock allows for the opening of different locks by adjusting the key teeth and achieves a security function. The magnetic key teeth and magnetic pins work together to prevent unauthorized unlocking. However, it does not address the vulnerability of exposed pins to damage, and there is room for further improvement in its anti-unlocking level. Summary of the Invention

[0006] The purpose of this invention is to provide a mechanical combination lock mechanism that conceals the pins. This mechanism has the advantages of reliable performance and ease of use of pin tumbler locks, the ability of one key to open multiple locks and good confidentiality of adjustable digital pin tumbler locks, and a higher level of anti-unlocking protection to prevent damage to the pins.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A mechanical combination lock mechanism with concealed pins includes a lock cylinder body, a lock cylinder moving part, a lock cylinder rotor, and a key.

[0009] The lock cylinder body has M columns of N through holes of the same size in each column, and non-magnetic tumblers are provided in the through holes;

[0010] The moving body of the lock cylinder is disposed within the main body of the lock cylinder. The moving body of the lock cylinder has M columns of N blind holes, each column having N holes that completely coincide with the central axis of the through holes in the main body of the lock cylinder. Magnetic pins are provided in the blind holes and engage with non-magnetic pins in the main body of the lock cylinder through pin springs. Specifically: at least one magnetic pin is misaligned at the joint surface between the main body of the lock cylinder and the moving body of the lock cylinder; at least one non-magnetic pin is misaligned at the joint surface between the main body of the lock cylinder and the moving body of the lock cylinder; and the interface between at least one magnetic pin and the non-magnetic pin that engages with it is flush with the joint surface between the main body of the lock cylinder and the moving body of the lock cylinder. The S or N poles of the magnetic pins in the same column of blind holes all face the same direction.

[0011] The lock cylinder rotor is located in the moving body of the lock cylinder and can rotate freely. The lock cylinder rotor has a key slot.

[0012] The key has a detachable magnetic tooth with the S pole facing the magnetic pin, a detachable magnetic tooth with the N pole facing the magnetic pin, and a hollow tooth. When the key is inserted into the key slot, the magnetic tooth causes the pin, which is misaligned at the engagement surface, to be level with the engagement surface, and the hollow tooth keeps the pin, which was originally level with the engagement surface, stationary, thereby unlocking the lock cylinder.

[0013] The aforementioned mechanical combination lock mechanism features concealed pins in both locked and unlocked states, offering a higher level of anti-unlocking protection and preventing pin damage. The pins are categorized into three types based on their relative positions to the mating surfaces of the lock cylinder body and moving parts: magnetic pins are misaligned at the mating surfaces, non-magnetic pins are misaligned at the mating surfaces, and the interface between magnetic and non-magnetic pins is flush with the mating surfaces. These three types of pins form a permutation and combination relationship, resulting in a ternary code for the combination lock. Correspondingly, the key features three types of teeth: a detachable magnetic tooth with the S-pole facing the magnetic pins, a detachable magnetic tooth with the N-pole facing the magnetic pins, and a hollow tooth. The arrangement of these three types of teeth on the key must perfectly correspond to the arrangement of the three types of pins within the lock cylinder for correct unlocking. Because ternary encoding can create more permutations and combinations with the same number of pins than binary encoding, this mechanical combination lock mechanism is more difficult to unlock illegally using permutation and combination methods compared to binary encoding combination lock mechanisms. In addition, its key teeth are detachable, and by adjusting the combination of the key teeth, one key can open multiple locks and prevent others from illegally opening the locks after finding the key.

[0014] Optionally, the inner end of the lock cylinder rotor is provided with a linkage fork and an ejector spring. The linkage fork is misaligned with the unlocking lever that drives the lock tongue. After the lock cylinder is unlocked, the ejector spring pushes the lock cylinder rotor and the lock cylinder moving body to translate along the axial direction of the key to align the linkage fork with the unlocking lever.

[0015] The aforementioned optional structure ensures that the fork connected to the lock cylinder rotor will only move to the unlock lever position with the translation of the lock cylinder moving body after correct unlocking. At this time, the lock cylinder rotor can be rotated by the torque of the key to drive the unlock lever to unlock. When not unlocked, the lock cylinder rotor can only spin freely, thus preventing the lock body from being damaged by a large torque when a tool is inserted into the key slot.

[0016] Optionally, the moving body of the lock cylinder is provided with an unlocking mechanism connected to the lock tongue at its inner end. The moving body of the lock cylinder and the rotor of the lock cylinder are engaged by spring balls at the mating surface, so that when the lock cylinder is not unlocked, the rotor of the lock cylinder can rotate relative to the moving body of the lock cylinder. After the lock cylinder is unlocked, the rotation of the rotor of the lock cylinder can drive the moving body of the lock cylinder to rotate around the axis of the key.

[0017] The above-mentioned optional structure constitutes another solution to prevent the lock body from being damaged by a tool inserted into the key slot with high torque. When the lock is not unlocked, the lock cylinder rotor can only spin freely when the tool is inserted into the key slot with high torque. Only after the lock is unlocked correctly will the moving part of the lock cylinder rotate together with the lock cylinder rotor through the friction force applied by the lock cylinder rotor, driving the unlocking mechanism to unlock.

[0018] Optionally, a pressure plate is provided at one end of each row of through holes in the lock cylinder body. The pressure plate encloses the non-magnetic pins in the lock cylinder body and the magnetic pins in the moving body of the lock cylinder that cooperate with them inside the lock cylinder. The pressure plate can be easily disassembled to adjust the cooperation between the non-magnetic pins and the magnetic pins in each of the holes.

[0019] The aforementioned optional structure allows the pressure plate to be opened to adjust the fit between the magnetic and non-magnetic balls, thereby enabling code transformation.

[0020] Optionally, the key slot is a rectangular slot.

[0021] The aforementioned optional structure facilitates key insertion into the lock cylinder and ensures it remains in the correct position.

[0022] Optionally, the key includes a key bar and a key handle. The key bar is provided with a rubber liner and a cover. The rubber liner has a key tooth mounting hole with the same shape as the key teeth to facilitate the insertion and removal of the key teeth. The cover encloses the key teeth and the key bar. The key handle is provided with a limiting pin. The cover has a pin hole that can be inserted into the limiting pin to keep the cover on the key bar. The key handle is provided with a key tooth compartment to carry spare key teeth.

[0023] The optional rubber liner makes it easier to insert and remove the key teeth, the sleeve protects the key teeth, and the key tooth compartment can carry spare key teeth to achieve more password combinations.

[0024] Optionally, the moving body of the lock cylinder is provided with at least one row of pseudo-magnetic pins, and the pseudo-magnetic pins and their pin springs are sealed together by a cover plate in blind holes on the moving body of the lock cylinder.

[0025] The pseudo-magnetic pins in the above optional structure do not function during normal unlocking, but they mislead when illegally unlocking using permutation and combination methods, further increasing the difficulty of illegally unlocking by permutation and combination.

[0026] Optionally, a portion of the dummy magnetic ball springs are located between the dummy magnetic ball and the pressure plate, while another portion of the dummy magnetic ball springs are located at the bottom of the blind hole, and the pressure plate that closes the dummy magnetic ball is detachable.

[0027] The aforementioned optional structures, by varying the positions of the pin springs, make it more difficult to illegally unlock the lock through a combination of arrangements. Furthermore, the detachable pressure plate allows for easy adjustment of the magnetic pole orientation of the pseudo-magnetic pins and the position of their springs, further increasing the difficulty of illegally unlocking the lock through a combination of arrangements. Attached Figure Description

[0028] Figure 1 This is a structural diagram of one embodiment;

[0029] Figure 2 This is a schematic diagram of the setup for the projectile;

[0030] Figure 3 This is a schematic diagram of the components of a key;

[0031] Figure 4 This is a schematic diagram showing the state of the moving body of the lock cylinder after translational motion.

[0032] Figure 5 A cross-sectional view of another embodiment;

[0033] Figure 6 Another cross-sectional view of another embodiment;

[0034] Reference numerals in the attached diagram: 1. Key; 2. Lock cylinder rotor; 3. Lock body front panel; 4. First pressure plate; 5. Lock cylinder body; 6. Joint surface; 7. Lock cylinder moving part; 8. Non-magnetic pin; 9. Magnetic pin; 10. Pin spring; 11. Limiting rod; 12. Push-out spring; 13. Linkage fork; 14. Lever; 15. Pin compartment cover; 16. Second pressure plate; 17. Pseudo-magnetic pin; 101. Key handle; 102. Key tooth compartment; 103. First magnetic key tooth; 104. Empty tooth; 105. Second magnetic key tooth; 106. Rubber liner; 107. Key rod; 108. Handle cover. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Figures 1 to 4 An embodiment of a hidden pin mechanical combination lock mechanism is shown. The mechanical combination lock mechanism includes a lock cylinder body 5, a lock cylinder moving body 7, a lock cylinder rotor 2, a lock body front panel 3, and a key 1. The lock cylinder body 5, the lock cylinder moving body 7, and the lock cylinder rotor 2 are made of non-magnetic materials such as commonly used copper (or stainless steel).

[0037] The lock cylinder body 5 has two rows of five through holes of the same size in each row, and the two rows of through holes are symmetrically arranged. Non-magnetic pins 8 are provided in the through holes.

[0038] The moving part 7 of the lock cylinder is disposed within the lock cylinder body 5. The moving part 7 has two rows of five blind holes, each row completely coinciding with the central axis of the through holes in the lock cylinder body 5. Magnetic pins 9 are disposed in the blind holes and engage with non-magnetic pins 8 in the lock cylinder body 5 via pin springs 10. Specifically: at least one magnetic pin 9 is misaligned at the mating surface 6 of the lock cylinder body 5 and the moving part 7; at least one non-magnetic pin 8 is misaligned at the mating surface 6 of the lock cylinder body 5 and the moving part 7; and the interface between at least one magnetic pin 9 and its mating non-magnetic pin 8 is flush with the mating surface 6 of the lock cylinder body 5 and the moving part 7. The S or N poles of the magnetic pins 9 in the same row of blind holes all face the same direction. Specifically, refer to… Figure 2 From left to right, the first and fifth blind holes on the upper side and the first and second blind holes on the lower side of the moving body 7 are provided with ball springs 10 to displace the magnetic balls 9 in these blind holes at the joint surface 6 of the lock cylinder body 5 and the moving body 7. The third and fourth through holes on the upper side and the third and fifth through holes on the lower side of the lock cylinder body 5 are provided with ball springs 10 to displace the non-magnetic balls 8 in these through holes at the joint surface 6 of the lock cylinder body 5 and the moving body 7. The second through hole on the upper side of the lock cylinder body 5 and the second blind hole on the upper side of the moving body 7, the fourth through hole on the lower side of the lock cylinder body 5 and the fourth blind hole on the lower side of the moving body 7 are all provided with ball springs 10 to make the interface between the non-magnetic balls 8 and the magnetic balls 9 in these holes flush with the joint surface 6 of the lock cylinder body 5 and the moving body 7.

[0039] The lock cylinder rotor 2 is located inside the lock cylinder moving body 7. The lock cylinder rotor 2 can rotate freely inside the lock cylinder moving body 7. The lock cylinder rotor 2 has a key slot, which is a rectangular slot to facilitate key insertion and maintain the correct position.

[0040] Reference Figure 3 The key 1 has a first magnetic tooth 103 with its S pole facing the magnetic pin and detachable, a second magnetic tooth 105 with its N pole facing the magnetic pin and detachable, and a hollow tooth 104. The arrangement of these three types of teeth corresponds to the arrangement of the mating surfaces 6 of the pins with the lock cylinder body 5 and the moving body 7. Specifically, from left to right, the S poles of the first and fifth teeth on the upper side and the first and second teeth on the lower side of the key 1 face the magnetic pins; the N poles of the third and fourth teeth on the upper side and the third and fifth teeth on the lower side of the key 1 face the magnetic pins; and the second tooth on the upper side and the fourth tooth on the lower side of the key 1 are hollow teeth.

[0041] Utilizing the principle of attraction between like poles and repulsion between unlike poles in magnets, when key 1 is inserted into the key slot, the first and fifth teeth on the upper side of the key and the first and second teeth on the lower side exert an attractive force on the magnetic pins in the first and fifth blind holes on the upper side and the first and second blind holes on the lower side of the moving body 7 of the lock cylinder. The third and fourth teeth on the upper side of the key and the third and fifth teeth on the lower side exert a repulsive force on the magnetic pins in the third and fourth blind holes on the upper side and the third and fifth blind holes on the lower side of the moving body 7 of the lock cylinder. This causes these magnetic pins and their mating non-magnetic pins 8 to move and become flush with the mating surface 6 of the lock cylinder body 5 and the moving body 7. Since the second tooth on the upper side and the fourth tooth on the lower side of the key are empty teeth, they do not exert a force on the magnetic pins in the second blind hole on the upper side and the fourth blind hole on the lower side of the moving body 7 of the lock cylinder. Therefore, these magnetic pins and their mating non-magnetic pins 8 maintain their original state of being flush with the mating surface 6. In this way, the interfaces of the five magnetic pins on the upper side and the five non-magnetic pins 8 that cooperate with them, and the interfaces of the five magnetic pins on the lower side and the five non-magnetic pins 8 that cooperate with them, are all flush with the mating surface 6 of the lock cylinder body 5 and the lock cylinder moving body 7, so that the lock cylinder is unlocked correctly and the lock cylinder moving body 7 and the lock cylinder body 5 can move relative to each other.

[0042] The aforementioned mechanical combination lock mechanism has concealed pins in both locked and unlocked states, providing a higher level of anti-unlocking protection and preventing pin damage. The pins are categorized into three types based on their relative positions to the mating surfaces 6 of the lock cylinder body 5 and the moving part 7: magnetic pins are misaligned at the mating surface 6, non-magnetic pins 8 are misaligned at the mating surface 6, and the interface between the magnetic and non-magnetic pins 8 is flush with the mating surface 6. These three types of pins form a permutation and combination relationship, resulting in a ternary code for the combination lock mechanism. Correspondingly, the key features three types of teeth: a first magnetic key tooth with the S pole facing the magnetic pins and detachable, a second magnetic key tooth with the N pole facing the magnetic pins and detachable, and a hollow tooth. The permutation and combination of these three types of teeth on the key must perfectly correspond to the permutation and combination of the three types of pins within the lock cylinder to achieve correct unlocking. Because ternary encoding can form more permutations and combinations with the same number of pins than binary encoding, this mechanical combination lock mechanism is more difficult to unlock illegally through permutation and combination methods compared to binary encoding combination lock mechanisms.

[0043] Furthermore, its key teeth are detachable. By adjusting the arrangement of the key teeth to correspond to the arrangement of the pins in the target lock, different locks can be unlocked. Therefore, users do not need to carry a key for each lock; they only need to carry one key. On the other hand, after unlocking, the arrangement of the key teeth can be scrambled to prevent unauthorized unlocking by others who find the key.

[0044] Reference Figure 1 and Figure 4In this embodiment, the inner end of the lock cylinder rotor 2 is provided with a linkage fork 13 and a push-out spring 12. The linkage fork 13 is offset from the unlocking lever 14 that drives the lock tongue (e.g., Figure 1 As shown), after the lock cylinder is unlocked, the ejector spring 12 pushes the lock cylinder rotor 2 and the lock cylinder moving body 7 to translate along the axis of the key, aligning the linkage fork 13 with the unlocking lever 14 (as shown). Figure 4 As shown in the diagram, the torque of the key causes the lock cylinder rotor 2 to rotate, which in turn rotates the fork 13. The fork 13 then moves the unlocking lever 14, which in turn moves the bolt to unlock the lock. The inner end of the lock cylinder moving body 7 is equipped with a moving body limiting rod 11. When the lock cylinder moving body 7 moves until the linkage fork 13 aligns with the unlocking lever 14, the moving body limiting rod 11 and the lock cylinder body 5 form a limit, preventing the lock cylinder moving body 7 from continuing to move. Since the fork 13 connected to the lock cylinder rotor 2 will only move to the unlocking lever 14 position with the translation of the lock cylinder moving body 7 after correct unlocking, and only then can the lock be unlocked, the lock cylinder rotor 2 can only rotate freely when not unlocked. This prevents tools inserted into the key slot from damaging the lock body due to high torque.

[0045] Reference Figure 1 and Figure 2 In this embodiment, a first pressure plate 4 is provided at one end of each row of through holes of the lock cylinder body 5. The first pressure plate 4 encloses the non-magnetic pins 8 in the lock cylinder body 5 and the magnetic pins 9 in the lock cylinder moving body 7 that cooperate with them in the lock cylinder. The first pressure plate 4 can be easily disassembled to adjust the cooperation between the non-magnetic pins 8 and the magnetic pins 9 in each hole. After opening the tumbler compartment cover 15 of the lock cylinder body, the first pressure plate 4 can be opened, thereby adjusting the non-magnetic tumblers, magnetic tumblers, and tumbler springs. The adjustment method can be: adjusting the position of the tumbler springs, for example, adjusting the tumbler springs from the through hole of the lock cylinder body to the blind hole of the lock cylinder moving body, or conversely, adjusting the tumbler springs that are only placed in the through hole of the lock cylinder body or only in the blind hole of the lock cylinder moving body to be placed in both the through hole of the lock cylinder body and the blind hole of the lock cylinder moving body, or conversely, adjusting the S pole of the magnetic tumbler to the N pole to the down, or conversely, adjusting one, two, or more, thereby changing the combination of the mechanical combination lock mechanism.

[0046] Reference Figure 3In this embodiment, the key includes a key bar 107 and a key handle 101. The key bar 107 includes an inner bar made of magnetic material, to which magnetic key teeth are attracted. The inner bar is covered by a rubber liner 106, which has holes of the same shape as the key teeth to facilitate insertion and removal of the magnetic key teeth. The position and number of these holes match the position and number of blind holes in the moving part 7 of the lock cylinder. Each hole on the rubber liner positions and holds the magnetic key teeth. The key handle 101 is partially hollowed out to form a key tooth storage compartment 102, in which spare key teeth can be placed. The key handle has a handle cover 108 to seal the key tooth storage compartment 102. The key bar extends into the key tooth storage compartment 102, and the spare key teeth are attracted to this extended portion of the key bar. By providing the key tooth storage compartment 102 and spare key teeth, the key can achieve more combination combinations.

[0047] Furthermore, the key handle 101 is provided with a limiting pin, and the key bar has a cover that encloses the key teeth and the key bar. The cover has a pin hole that can be inserted into the limiting pin on the key handle 101 to keep the key cover on the key bar. The cover can protect the key teeth.

[0048] It should be understood that the number of columns of the through holes in the main body 5 of the lock cylinder and the blind holes in the corresponding moving body 7 of the lock cylinder can also be other, such as 1 column, 3 columns, 4 columns, etc. The number of holes in each column can also be other, such as 4, 6, 7, etc. The more columns there are, the more holes in each column, the more digits the password has, and the more difficult it is to unlock illegally through permutation and combination.

[0049] Figure 5 and Figure 6 Another embodiment of a mechanical combination lock mechanism with hidden pins is shown. The unlocking principle of this embodiment is the same as the previous embodiment, except that pseudo-magnetic pins 17 are added to the moving part 7 of the lock cylinder to mislead users when illegally using permutation and combination methods to unlock the lock. One or more columns of pseudo-magnetic pins 17 can be provided, with multiple pseudo-magnetic pins in each column.

[0050] In this embodiment, two columns are arranged symmetrically in the vertical direction, each column containing six sets of magnetic balls 9 and non-magnetic balls 8 (e.g., Figure 5 As shown), two rows of pseudo-magnetic pins 17 are symmetrically arranged in the horizontal direction of the moving body 7 of the lock cylinder (as shown). Figure 6 (As shown).

[0051] like Figure 6As shown, this embodiment specifically includes two rows of six pseudo-magnetic pins 17 each. The pseudo-magnetic pins and their springs 10 are enclosed by the second pressure plate 16 within blind holes on the moving body 7 of the lock cylinder. Some springs 10 are located between the pseudo-magnetic pins 17 and the second pressure plate 16, while others are located at the bottom of the blind holes. The position and number of blind holes correspond to the position and number of key tooth mounting holes on the key 1. Utilizing the principle of attraction between like poles and repulsion between unlike poles of magnets, when the key 1 is inserted into the lock cylinder, the pseudo-magnetic pins 17 will move under the action of the magnetic teeth on the key 1. However, since the pseudo-magnetic pins 17 are enclosed within the moving body 7 of the lock cylinder, they will not misalign at the mating surface 6 between the lock cylinder body 5 and the moving body 7 before or after movement. Therefore, the pseudo-magnetic pins 17 do not function during normal unlocking and only play a misleading role when illegally using permutation and combination methods to unlock.

[0052] It should be noted that both the pseudo-magnetic ball 17 and the magnetic ball 9 in this application are permanent magnets. The pseudo-magnetic ball 17 does not function as a ball, so it is called a pseudo-ball.

[0053] Preferably, the cover plate of the closed pseudo-magnetic pin 17 is detachably assembled to the moving body 7 of the lock cylinder, so as to facilitate the removal of the cover plate to adjust the magnetic pole orientation of the pseudo-magnetic pin and the position of the pin spring.

[0054] The present invention has been described in detail above through specific embodiments. These detailed descriptions are only intended to help those skilled in the art understand the content of the present invention and should not be construed as limiting the scope of protection of the present invention. Various modifications and equivalent transformations made by those skilled in the art to the above solutions under the concept of the present invention should be included within the scope of protection of the present invention.

Claims

1. A mechanical combination lock mechanism for concealing pins, characterized in that: Includes the lock cylinder body, lock cylinder moving part, lock cylinder rotor, and key. The lock cylinder body has M columns of N through holes of the same size in each column, and non-magnetic tumblers are provided in the through holes; The moving body of the lock cylinder is disposed within the main body of the lock cylinder. The moving body of the lock cylinder has M columns of N blind holes, each column having N holes that completely coincide with the central axis of the through holes in the main body of the lock cylinder. Magnetic pins are provided in the blind holes and engage with non-magnetic pins in the main body of the lock cylinder through pin springs. Specifically: at least one magnetic pin is misaligned at the joint surface between the main body of the lock cylinder and the moving body of the lock cylinder; at least one non-magnetic pin is misaligned at the joint surface between the main body of the lock cylinder and the moving body of the lock cylinder; and the interface between at least one magnetic pin and the non-magnetic pin that engages with it is flush with the joint surface between the main body of the lock cylinder and the moving body of the lock cylinder. The S or N poles of the magnetic pins in the same column of blind holes all face the same direction. The lock cylinder rotor is located in the moving body of the lock cylinder and can rotate freely. The lock cylinder rotor has a key slot. The key has a magnetic tooth with the S pole facing the magnetic tumbler and detachable, a magnetic tooth with the N pole facing the magnetic tumbler and detachable, and a hollow tooth. When the key is inserted into the key slot, the magnetic tooth causes the tumbler, which is misaligned at the engagement surface, to be level with the engagement surface, and the hollow tooth keeps the tumbler, which was originally level with the engagement surface, stationary, thereby unlocking the lock cylinder. The lock cylinder rotor has a linkage fork and an ejector spring at its inner end. The linkage fork is misaligned with the unlocking lever that drives the bolt. After the lock cylinder is unlocked, the ejector spring pushes the lock cylinder rotor and the moving body of the lock cylinder to translate along the axis of the key, aligning the linkage fork with the unlocking lever. At this time, the torque of the key causes the lock cylinder rotor to rotate the linkage fork, which in turn drives the unlocking lever to move. The unlocking lever then drives the bolt to unlock. The moving body of the lock cylinder has a moving body limiting rod at its inner end. When the moving body of the lock cylinder translates to the point where the linkage fork and the unlocking lever are aligned, the moving body limiting rod and the lock cylinder body form a limit, preventing the moving body of the lock cylinder from continuing to translate.

2. The mechanical combination lock mechanism for concealing pins according to claim 1, characterized in that: The moving body of the lock cylinder is provided with an unlocking mechanism connected to the lock tongue at its inner end. The moving body of the lock cylinder and the lock cylinder rotor are engaged by spring balls at the joint surface, so that when the lock cylinder is not unlocked, the lock cylinder rotor can rotate relative to the moving body of the lock cylinder. After the lock cylinder is unlocked, the rotation of the lock cylinder rotor can drive the moving body of the lock cylinder to rotate around the axis of the key.

3. The mechanical combination lock mechanism for concealing pins according to claim 1, characterized in that: A pressure plate is provided at one end of each row of through holes in the lock cylinder body. The pressure plate encloses the non-magnetic pins in the lock cylinder body and the magnetic pins in the moving body of the lock cylinder that cooperate with them inside the lock cylinder. The pressure plate can be easily disassembled to adjust the cooperation between the non-magnetic pins and the magnetic pins in each of the holes.

4. The mechanical combination lock mechanism for concealing pins according to claim 1, characterized in that: The key slot is a rectangular slot.

5. The mechanical combination lock mechanism for concealing pins according to claim 1, characterized in that: The key includes a key bar and a key handle. The key bar has a rubber liner and a cover. The rubber liner has a key tooth mounting hole with the same shape as the key teeth to facilitate the insertion and removal of the key teeth. The cover encloses the key teeth and the key bar. The key handle has a limiting pin. The cover has a pin hole that can be inserted into the limiting pin to keep the cover on the key bar. The key handle has a key tooth compartment to carry spare key teeth.

6. The mechanical combination lock mechanism for concealing pins according to claim 1, characterized in that: The moving body of the lock cylinder is provided with at least one row of pseudo-magnetic pins, and the pseudo-magnetic pins and their springs are sealed together by a cover plate in blind holes on the moving body of the lock cylinder.

7. The mechanical combination lock mechanism for concealing pins according to claim 6, characterized in that: A portion of the pseudo-magnetic ball springs are located between the pseudo-magnetic ball and the pressure plate, while another portion of the pseudo-magnetic ball springs are located at the bottom of the blind hole. The pressure plate that closes the pseudo-magnetic ball is detachable.

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