A latch-type lock

Abstract

The present invention provides a latch-type lock, comprising a cap, a stud composed of a first semicircular stud and a second semicircular stud, a pin, an ejector pin, and an unlocking code. The cap is provided with a first inner hole and at least one set of radial through holes, the stud being threadedly connected to the first inner hole; the stud is provided with radial inner holes corresponding one to one with the radial through holes, a long pin and a short pin being provided in the radial through holes; the ejector pin is used for unlocking; the stud is provided with a second inner hole, a first annular groove being provided on the wall of the second inner hole; a circular slider composed of a plurality of sector-shaped blocks is provided in the first annular groove, the circular slider being provided with a first through hole; an elastic member is provided between each sector-shaped block and the first annular groove; a stopper is provided at one end of the pin, and the other end is truncated cone-shaped, with a second annular groove being provided between the two ends. The lock of the present invention has a simple structure, low manufacturing and use costs, high security, and is suitable for occasions where the lock is not unlocked for a long time and is used once.

Description

Technical Field

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

[0002] In daily life or production and operation, people usually use padlocks, electronic password locks and other types of locks to seal the items that need to be locked at the storage port.

[0003] If a padlock is used and the key is separated from the lock, people may have to store the rarely used key separately. As a result, over time, they may forget where they stored the key and cannot find it when they need it. If the key storage location is far from the storage location, people need to run back and forth to open the lock, which is inconvenient and cannot provide timely and effective response in emergencies. Although electronic combination locks can avoid the need to separate the key from the lock body, they have complex structures due to the electronic circuitry and transmission mechanism. The manufacturing cost and maintenance requirements are high. Even if the lock is not unlocked for a long time, regular maintenance is required to prevent circuit short circuits and parts rust and failure, resulting in high purchase and use costs. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and propose a latch-type lock to solve the problem that the existing lock is inconvenient to use or has high cost when the key is separated from the lock body when it is not needed for a long time after being locked, but is needed only a long time later.

[0005] The present invention provides a latch-type lock comprising a lock body and an unlocking code for unlocking the lock, wherein the lock body comprises a cap, a stud, a pin and a thimble.

[0006] A first inner hole is provided in the cap, the stud is embedded in the first inner hole and is threadedly connected to the first inner hole, and the stud is composed of a first semicircular stud and a second semicircular stud;

[0007] The cap is further provided with at least one group of radial through holes, each of which is spaced apart along the circumference of the cap; the stud is provided with radial inner holes on its arc surface corresponding to the radial through holes in each group, and each group of radial inner holes is composed of a plurality of short radial inner holes and at least one long radial inner hole;

[0008] A long pin is provided in the radial through hole corresponding to the long radial inner hole, and a short pin is provided in the radial through hole corresponding to the short radial inner hole, and one end of the long pin and the short pin are flush with the outer wall of the cap, and the diameters of the long pin and the short pin match the diameters of the radial through hole and the radial inner hole; the length of the long pin is not greater than the length of the long radial inner hole and greater than the length of the radial through hole, and the length of the short pin is greater than the length of the short radial inner hole and equal to the length of the radial through hole;

[0009] The diameter of the ejector pin matches the diameter of the radial through hole, and the ejector pin is provided on the cap and is used to push the long pin according to the unlocking password when unlocking;

[0010] The outer diameter of the stud is larger than the inner diameter of the lock buckle fixed on the door leaf, and the stud is provided with a second inner hole with a diameter of D1 along the axis, and a first annular groove with an outer diameter of D2 is provided on the wall of the second inner hole;

[0011] A coaxial circular slider with a diameter of D3 is provided in the first annular groove, and a first through hole with a diameter of D4 is provided along the axis of the circular slider, wherein D2>D3>D1>D4, and the circular slider is slidably connected to the stud in the first annular groove;

[0012] The circular slider is composed of a plurality of equally divided sector blocks, and an elastic member is provided between each sector block and the first annular groove, and the elastic member is used to provide a rebound thrust for the corresponding sector block to slide radially in the first annular groove;

[0013] A stopper is provided at one end of the pin shaft for preventing the pin shaft from passing through the locking buckle ring. The other end is in a truncated cone shape, and the diameter of the bottom surface of the truncated cone away from the stop block is not greater than the diameter D4 of the first through hole. The pin shaft diameter D5 matches the second inner hole diameter D1; a second annular groove with an inner diameter of D4 is also provided between the two ends of the pin shaft, and the length of the second annular groove is the same as that of the first annular groove, so that after the truncated cone-shaped end of the pin shaft is inserted into the second inner hole, the second annular groove is aligned with the first annular groove.

[0014] Preferably, the elastic member is a spring sheet, the middle portion of the spring sheet abuts against the corresponding sector block, and both ends of the spring sheet abut against the bottom wall of the first annular groove;

[0015] There is a preset distance between the ends of adjacent spring sheets.

[0016] Further preferably, the height of the spring sheet is the same as the length of the first annular groove.

[0017] Preferably, the first inner hole includes an inner hole section A and an inner hole section B coaxially connected to the inner hole section A, and the diameter of the inner hole section A is smaller than the diameter of the inner hole section B; the radial through hole is provided in the cap area corresponding to the inner hole section A;

[0018] The stud includes a C-section stud and a D-section stud coaxially connected to the C-section stud, the C-section stud is located in the inner hole section A, and the D-section stud is located in the inner hole section B; the second inner hole is set in the D-section stud.

[0019] Preferably, an identification mark for identifying the sequence of the radial through holes is provided on the outer wall of the cap.

[0020] Preferably, the stop member is a stop block coaxial with the pin shaft, and the diameter of the stop block is larger than the diameter of the locking ring.

[0021] It can be seen from the above technical solutions that the present invention has the following advantages:

[0022] The present invention provides a latch-type lock. When locking, the cap, stud, and pin are positioned on either side of the door leaf's lock ring. The pin is passed through the lock ring and inserted into the second inner hole of the stud until each sector-shaped block engages with the second annular groove, causing the pin to be locked in the first through hole. To unlock, the long pin is identified according to the unlocking code and pushed into the corresponding radially long inner hole. The cap is then rotated until it separates from the stud. The sector-shaped blocks can then be removed from the second annular groove by separating the first and second semicircular studs. The pin can then be withdrawn from the lock ring, completing the unlocking process.

[0023] The locking and unlocking structure of the lock of the present invention has a simple principle, no precision manufacturing requirements for structural parts, low manufacturing process requirements, no maintenance, and low manufacturing and use costs; it adopts the binary password principle to unlock, and there is no trial and error opportunity, which can avoid the situation of cracking the password due to multiple trials and errors, and has high security. There is no need to set up a separate key, avoiding the trouble of storing the key. It is particularly suitable for occasions where it is not needed to be unlocked for a long time and is used once. It solves the problem of existing locks that when it is faced with the situation that the key is not convenient to use or the cost of use is high after being separated from the lock body and it is not needed to be opened for a long time after being locked. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A longitudinal cross-sectional view of a latch-type lock in an unlocked state provided by an embodiment of the present invention;

[0026] Figure 2 A longitudinal cross-sectional view of a latch-type lock provided by an embodiment of the present invention, when the pin shaft enters the second inner hole;

[0027] Figure 3 A longitudinal cross-sectional view of a latch-type lock in a locked state provided by an embodiment of the present invention;

[0028] Figure 4 for Figure 3 AA section view in;

[0029] Figure 5 for Figure 3 BB cross-sectional view in;

[0030] Figure 6 An exploded view of a latch-type lock provided by an embodiment of the present invention;

[0031] Figure 7 for Figure 6 Schematic diagram of the use status of medium and short pins;

[0032] Figure 8 for Figure 6 Schematic diagram of the use status of the medium and long pins;

[0033] Figure 9 A schematic diagram of a usage scenario of a latch-type lock provided by an embodiment of the present invention;

[0034] Among them, the figure marks are explained: cap 1, stud 2, pin 3, first inner hole 4, first semicircular stud 5, second semicircular stud 6, radial through hole 7, radial short inner hole 8, radial long inner hole 9, long pin 10, short pin 11, ejector pin 12, locking ring 13, second inner hole 14, first annular groove 15, circular slider 16, first through hole 17, fan-shaped block 18, second annular groove 19, spring sheet 20, inner hole section A 21, inner hole section B 22, section C stud 23, section D stud 24, stop block 25. DETAILED DESCRIPTION

[0035] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] In the description of this application, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0037] Unless otherwise expressly specified or limited, the terms "connect," "fixed," and "disposed" should be interpreted broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, indirect connections through an intermediary, or connections within two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0038] 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 quantity of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features, unless otherwise specifically specified.

[0039] The embodiment of the present invention provides a latch-type lock, comprising a lock body and an unlocking code for unlocking, such as Figures 1 to 6 As shown, the lock body includes a cap 1, a stud 2, a pin 3 and a thimble 12. A first inner hole 4 is provided in the cap 1. The stud 2 is embedded in the first inner hole 4 and is threadedly connected to the first inner hole 4. The stud 2 is composed of a first semicircular stud 5 and a second semicircular stud 6.

[0040] The cap 1 is further provided with two groups of radial through holes 7, which are respectively located on two planes perpendicular to the axial direction of the first inner hole 4. The radial through holes 7 located on the same plane are grouped together, and the radial through holes 7 in each group are spaced apart and distributed around the circumference of the cap 1; the stud 2 is provided with radial inner holes corresponding to each group of radial through holes 7 on its arc surface, and each group of radial inner holes is composed of a plurality of short radial inner holes 8 and at least one long radial inner hole 9;

[0041] like Figure 5 As shown, a long pin 10 is provided in the radial through hole corresponding to the long radial inner hole 9, and a short pin 11 is provided in the radial through hole corresponding to the short radial inner hole 8, and one end of the long pin 10 and the short pin 11 are flush with the outer wall of the cap 1, and the diameters of the long pin 10 and the short pin 11 match the diameters of the radial through hole 7 and the radial inner hole; the length of the long pin 10 is not greater than the length of the long radial inner hole 9 and greater than the length of the radial through hole 7, and the length of the short pin 11 is greater than the length of the short radial inner hole 8 and equal to the length of the radial through hole 7;

[0042] The ejector pin 12 is provided on the cap 1 and is used to push the long pin 10 according to the unlocking code when unlocking the lock. The diameter of the ejector pin 12 matches the diameter of the radial through hole 7 to ensure that it can smoothly extend into the radial through hole 7. In a specific embodiment, the cap 1 can have an inner hole to store the ejector pin 12. Alternatively, a through hole can be provided on the edge of the cap 1 for a hanging rope to pass through. One end of the hanging rope is bolted to the edge of the cap 1, and the other end is bolted to the ejector pin 12, similar to the connection method between a mobile phone and a mobile phone pendant.

[0043] Specifically, the diameter of the radial inner hole can be kept the same as the diameter of the corresponding radial through hole 7. To avoid processing or installation errors and ensure that the long pin 10 and the short pin 11 can enter the radial inner hole more easily, the diameter of the radial inner hole can also be appropriately larger than the diameter of the radial through hole 7.

[0044] It should be noted that the diameters of the long pins 10 and the short pins 11 are such that they can be fixed by friction with the radial through holes 7 and the radial inner holes, while at the same time ensuring that the friction can be overcome and the pins 12 can be pushed. The number of radial long inner holes 9 and the number of groups of radial through holes 7 in each group of radial inner holes can be set according to the level of key cracking resistance in the application. The password principle of the lock provided by the embodiment of the present invention is: if there are n radial through holes, the arrangement order of the long pins 10 and the short pins 11 corresponds to 2 n In order to ensure the locked state before use, that is, the cap 1 cannot be rotated, at least one long pin 10 must be present. The probability of unlocking by blind guessing is 2 n-1 One-third, such as Figures 1-3 As shown, there are two groups of radial inner holes, each group has 6 radial inner holes, and each group has two radial long inner holes 9. Then the probability of blind guessing to crack each group is 2 4 One percent.

[0045] The stud 5 is provided with a second inner hole 14 with a diameter D1 along the axis, and a first annular groove 15 with an outer diameter D2 is provided on the wall of the second inner hole 14;

[0046] A coaxial circular slider 16 with a diameter of D3 is disposed within the first annular groove 15. A first through-hole 17 with a diameter of D4 is disposed along the axis of the circular slider 16. The relationship D2>D3>D1>D4 is established. The circular slider 16 is slidably connected to the stud 5 within the first annular groove 15. Specifically, the thickness of the circular slider 16 can be slightly smaller than the length of the first annular groove 15, leaving a gap of 0 to 1 mm between the end surfaces of the circular slider 16 and the first annular groove 15.

[0047] like Figure 4As shown, the circular slider 16 is composed of a plurality of equally divided sector blocks 18. An elastic member is provided between each sector block 18 and the first annular groove 15. The elastic member is used to provide a rebound thrust for the corresponding sector block 18 to slide radially in the first annular groove 15.

[0048] The outer diameter of the stud 2 is larger than the inner diameter of the locking ring 13 fixed to the door leaf, preventing the entire assembly consisting of the cap 1 and stud 2 from completely passing through the locking ring 13. A stopper is provided at one end of the pin 3 to prevent the pin 3 from passing through the locking ring 13. The other end is truncated cone-shaped, and the diameter of the cone's bottom surface away from the stopper is no larger than the diameter D4 of the first through hole 17. The diameter D5 of the pin 3 matches the diameter D1 of the second inner hole 14. A second annular groove 19 with an inner diameter D4 is also provided between the two ends of the pin 3. The length of the second annular groove 19 is the same as that of the first annular groove 15, so that after the truncated cone-shaped end of the pin 3 is inserted into the second inner hole 14, the second annular groove 19 is aligned with the first annular groove 15.

[0049] The present invention provides a latch lock. Before locking, the lock body of the embodiment of the present invention is divided into two independent parts, one part is the pin 3, and the other part is the cap 1 and the stud 2. Figure 9 As shown, when in use, the two parts of the lock body are respectively located on both sides of the lock buckle 13 on the door leaf, and the truncated cone-shaped end of the pin shaft 3 is passed through the lock buckle 13 and inserted into the second inner hole 14 of the stud 2. When the truncated cone-shaped end of the pin shaft 3 passes through the first through hole 17 on the circular slider 16, it will push each sector block 18 to slide outward in a dispersed manner, thereby causing each sector block 18 to squeeze the corresponding elastic member; when the second annular groove 19 of the pin shaft 3 is aligned with the first annular groove 15, each sector block 18 is pushed toward the axis by the rebound thrust of the corresponding elastic member and resets and is stuck in the second annular groove 19, thereby blocking the pin shaft 3 in the first through hole 17 to complete the locking.

[0050] When unlocking, the long pin 10 is identified according to the unlocking password, and the long pin 10 is pushed into the corresponding radial long inner hole 9 using the ejector pin 12. Then the cap 1 is rotated to separate from the stud 2. The first semicircular stud 5 and the second semicircular stud 6 can be separated to remove each sector 18 from the second annular groove 19, and the pin shaft 3 can be withdrawn from the lock buckle 13 to complete the unlocking.

[0051] It should be noted that the unlocking password is the sequence number of the long pin 10 and the short pin 11, which is provided by the manufacturer along with the lock body of the present invention. Each lock embodiment of the present invention corresponds to a unique serial number and the sequence number of the long pin 10 and the short pin 11, which can be included in the lock product manual for the user to read. Of course, a method for obtaining the unlocking password via the Internet can also be set up. After passing the authentication based on the lock number and order number, the manufacturer can query the corresponding sequence number of the long pin 10 and the short pin 11 stored on the password server. Specifically, a binary sequence can be used, where 0 indicates the position of the short pin and does not need to be pushed; 1 indicates the position of the long pin and requires pushing. Other serial numbering methods such as letters that can distinguish the arrangement positions of the long pin 10 and the short pin 11 can also be used.

[0052] like Figures 7 and 8 As shown, unlike electronic combination locks equipped with electronic circuits and transmission mechanisms, rotary combination locks with unlocking mechanisms and transmission mechanisms, and conventional snap-on lock structures with springs and transmission mechanisms, the locking and unlocking structure principles of the lock structure of the present invention are relatively simple, do not require precision manufacturing of structural parts, have low manufacturing process requirements, do not require maintenance, and have low manufacturing and use costs; Figures 7 and 8 As shown, the unlocking method adopts the binary password principle of the long pin 10 and the short pin 11. Compared with the electronic password lock which requires the lock core chip algorithm to decode and verify the password, the unlocking method is particularly simple and there is no trial and error opportunity, which can avoid the situation of cracking the password by multiple trials and errors. It has higher security and does not require a separate key, avoiding the trouble of storing keys or keys being copied. It is especially suitable for occasions where the key is not needed for a long time and is used once. It solves the problem of existing locks that when the key is separated from the lock body and does not need to be opened for a long time after being locked, but needs to be opened for a long time, it is inconvenient to use or the cost of use is high.

[0053] In a specific embodiment, the elastic member is a symmetrically structured spring leaf 20, with the middle portion of the spring leaf 20 abutting against the corresponding sector block 18, and the ends of the spring leaf 20 abutting against the bottom wall of the first annular groove 15. A predetermined spacing exists between the ends of adjacent spring leaves 20, serving as the clearance distance for the spring leaf 20 to expand and contract after being compressed. Specifically, to prevent excessive clearance between the spring leaf 20 and the first annular groove 15 along the axial direction of the second inner hole 14, which would cause the spring leaf 20 to ricochet when it expands and contracts, the height of the spring leaf 20 is the same as the length of the first annular groove 15, thereby preventing the spring leaf 20 from axially moving along the second inner hole 14 and ensuring the stability of the spring leaf 20 during deformation.

[0054] In a specific embodiment, the first inner hole 4 includes an inner hole section A 21 and an inner hole section B 22 coaxially connected to inner hole section A 21, wherein the diameter of inner hole section A 21 is smaller than that of inner hole section B 22. The radial through hole 7 is provided in the length region of the cap 1 corresponding to inner hole section A 21. The stud 2 includes a section C stud 23 and a section D stud 24 coaxially connected to section C stud 23, wherein section C stud 23 is located within inner hole section A 21 and section D stud 24 is located within inner hole section B 22. The second inner hole 14 is provided within section D stud 24. This allows the second inner hole 14 and the radial inner hole to be located at different length segments of the stud 2, thereby preventing the second inner hole 14 from overlapping with the radial inner hole, thereby increasing the diameter of the stud 2. This helps reduce the diameter of the stud 2, reduces the material used in the lock embodiment of the present invention, and reduces manufacturing costs.

[0055] In one specific embodiment, markings are provided on the outer wall of the cap 1 to identify the sequence of the radial through holes 7. This facilitates the user to quickly identify the starting position of the radial through holes 7 and quickly determine the positions of the radial through holes 7 corresponding to the long pins 10 and the short pins 11. For example, a recessed point can be provided next to the first radial through hole 7 in each group and painted to indicate the first radial through hole 7 in that group, with arrows indicating the clockwise sequence.

[0056] In a specific embodiment, the above-mentioned stop member is a stop block 25 coaxial with the pin shaft 3, and the diameter of the stop block 25 is larger than the diameter of the lock buckle 13. Specifically, the appearance of the cap 1 can also be set to be cylindrical, so that the overall appearance of the lock of the embodiment of the present invention is harmonious and beautiful.

[0057] In addition, when the locks provided by the embodiment of the present invention are used in batches, a set of lock numbers can also be independently customized according to customer needs, so that each set of locks corresponds to a specific user object or location, such as using the equipment number, room number, safe number, etc. as the basis for compiling the lock number, thereby facilitating unified management during batch application and reducing the cost of managing and applying unlocking passwords.

[0058] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A latch-type lock comprising a lock body and an unlocking code for unlocking the lock, characterized in that: The lock body includes a cap, a stud, a pin and a thimble. A first inner hole is provided in the cap, the stud is embedded in the first inner hole and is threadedly connected to the first inner hole, and the stud is composed of a first semicircular stud and a second semicircular stud; The cap is further provided with at least one group of radial through holes, each of which is spaced apart along the circumference of the cap; the stud is provided with radial inner holes on its arc surface corresponding to the radial through holes in each group, and each group of radial inner holes is composed of a plurality of short radial inner holes and at least one long radial inner hole; A long pin is provided in the radial through hole corresponding to the long radial inner hole, and a short pin is provided in the radial through hole corresponding to the short radial inner hole, and one end of the long pin and the short pin are flush with the outer wall of the cap, and the diameters of the long pin and the short pin match the diameters of the radial through hole and the radial inner hole; the length of the long pin is not greater than the length of the long radial inner hole and greater than the length of the radial through hole, and the length of the short pin is greater than the length of the short radial inner hole and equal to the length of the radial through hole; The diameter of the ejector pin matches the diameter of the radial through hole, and the ejector pin is provided on the cap and is used to push the long pin according to the unlocking password when unlocking; The outer diameter of the stud is larger than the inner diameter of the lock buckle fixed on the door leaf, and the stud is provided with a second inner hole with a diameter of D1 along the axis, and a first annular groove with an outer diameter of D2 is provided on the wall of the second inner hole; A coaxial circular slider with a diameter of D3 is provided in the first annular groove, and a first through hole with a diameter of D4 is provided along the axis of the circular slider, wherein D2>D3>D1>D4, and the circular slider is slidably connected to the stud in the first annular groove; The circular slider is composed of a plurality of equally divided sector blocks, and an elastic member is provided between each sector block and the first annular groove, and the elastic member is used to provide a rebound thrust for the corresponding sector block to slide radially in the first annular groove; A stopper is provided at one end of the pin shaft for preventing the pin shaft from passing through the locking buckle ring, and the other end is truncated cone-shaped, and the diameter of the bottom surface of the cone away from the stopper is no larger than the diameter D4 of the first through hole, and the diameter D5 of the pin shaft matches the diameter D1 of the second inner hole; a second annular groove with an inner diameter D4 is also provided between the two ends of the pin shaft, and the length of the second annular groove is the same as that of the first annular groove, so that after the truncated cone-shaped end of the pin shaft is inserted into the second inner hole, the second annular groove is aligned with the first annular groove; The stopper is a stop block coaxial with the pin shaft, and the diameter of the stop block is larger than the diameter of the locking ring.

2. A latch-type lock according to claim 1, characterized in that: The elastic member is a spring sheet, the middle portion of the spring sheet abuts against the corresponding sector block, and both ends of the spring sheet abut against the bottom wall of the first annular groove; There is a preset distance between the ends of adjacent spring sheets.

3. The latch lock according to claim 2, characterized in that: The height of the spring sheet is the same as the length of the first annular groove.

4. The latch lock according to claim 1, wherein: The first inner hole includes an inner hole section A and an inner hole section B coaxially connected to the inner hole section A, wherein the diameter of the inner hole section A is smaller than the diameter of the inner hole section B; the radial through hole is provided in the cap area corresponding to the inner hole section A; The stud includes a C-section stud and a D-section stud coaxially connected to the C-section stud, the C-section stud is located in the inner hole section A, and the D-section stud is located in the inner hole section B; the second inner hole is set in the D-section stud.

5. The latch lock according to claim 1, characterized in that: The outer wall of the cap is provided with markings for identifying the sequence of the radial through holes.

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