Double-lock structure
By designing a double lock structure containing multiple lock beads and complex key structures, the problem of poor anti-theft performance of the existing lock structure is solved, and higher anti-theft performance and lock structure complexity are achieved.
Patent Information
- Application Number
- CN202510178997.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2025-04-25
AI Technical Summary
The existing lock structure has poor anti-theft performance and is easily opened by stolen lock unlocking tools such as tin foil.
A double lock structure is designed, and the first full lock bead and the lock shell marble are slidably connected through the lock shell, and the first full lock bead hole and the second full lock bead hole are formed on the lock gallbladder. The key forms a second full lock plate and the first full lock plate. Combined with unlocking convex teeth, unlocking concave holes, springs and limit structures, the complexity and anti-theft performance of the lock are enhanced.
By increasing the complexity of the lock structure and the multiple lock bead system, the anti-theft performance of the lock is significantly improved, making it difficult to open by the stolen lock unlocking tool.
Smart Images
Figure CN119877936A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of lock structures, and in particular to a double lock structure. Background Art
[0002] At present, the lock structure mainly includes a lock core, a lock shell, marbles and a key. The outer wall of the lock core is cylindrical, and the lock core is rotatably arranged in a circular hole of the lock shell. The key is inserted into the lock hole of the lock core, and the groove structure on the key matches each marble, so that the marbles leave the outer cylindrical surface of the lock core, and the lock core can be rotated. The lock core is connected to a lever, and the lever swings to drive the external lock-related structure, for example, the lever drives the lock tongue to move; however, if tin foil or other lock-opening tools are inserted into the lock hole, the marbles will press the tin foil, which will easily open the lock structure. Therefore, the anti-theft performance of the existing lock structure is poor, and it is necessary to improve it. Summary of the invention
[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a double lock structure with better anti-theft performance.
[0004] The purpose of the present invention is achieved through the following technical solutions.
[0005] The lock core is rotatably arranged in the lock shell, and the lock core is formed with a lock hole for axially inserting the key, wherein the lock shell is slidably connected with a first lock ball and a lock shell marble, the lock core is formed with a first lock ball hole and a second lock ball hole, the first lock ball can slide into the first lock ball hole, and the second lock ball is slidably connected in the second lock ball hole, the key is formed with a second key plate and the first key plate, the upper portion of the second key plate is connected to the lower portion of the first key plate, the upper end of the first key plate is formed with an unlocking convex tooth for inserting the first lock ball hole from the inside to the outside so as to push the first lock ball to the outer end of the first lock bead hole, and an unlocking recess is formed on one side of the second key plate, and the outer end of the first lock ball is correspondingly provided with a The lock core has a first spring in the lock bead hole, and the outer end of the lock shell ball is correspondingly provided with a second spring for pushing the inner end of the second lock bead into the unlocking recess, and an unlocking limiting structure for limiting the insertion of the unlocking convex tooth into the first lock bead hole is formed in the lock hole; the lock core has a locked position relative to the lock shell, in which the inner end of the first lock bead is located in the first lock bead hole, the outer end of the first lock bead is located in the lock shell, the outer end of the second lock bead is misaligned with the outer wall of the lock core, and the outer end of the second lock bead is abutted and connected to the inner end of the lock shell ball; the key has an unlocking position relative to the lock hole, in which the unlocking convex tooth is inserted into the first lock bead hole, the inner end of the second lock bead is inserted into the unlocking recess, the outer end of the second lock bead is flush with the outer wall of the lock core, and the key is abutted and connected to the unlocking limiting structure.
[0006] Preferably, the lock hole includes a second slot and a first slot, the first lock bead hole is connected to the upper end of the first slot, the second lock bead hole is connected to the second slot, the second slot and the first slot are staggered left and right, the upper part of the second slot is connected to the lower part of the first slot, the width of the second slot is adapted to the thickness of the second key plate, and the width of the first slot is adapted to the thickness of the first key plate.
[0007] Preferably, the unlocking limiting structure is set as the upper end of the second slot, and the upper end of the second heavy key plate can be abutted and connected to the upper end of the second slot.
[0008] Preferably, the first re-key plate is highly matched with the first slot.
[0009] Preferably, the inner end of the first-weight bead locking hole is formed with a first bead hole bottom edge for limiting the first-weight bead, and the inner end of the second-weight bead locking hole is formed with a second bead hole bottom edge for limiting the second-weight bead.
[0010] Preferably, the width of the first slot is smaller than the inner diameter of the first heavy bead locking hole.
[0011] Preferably, the first bead locking holes and the second bead locking holes are respectively arranged axially at intervals.
[0012] Preferably, a convex arc edge is formed at the rear end of the key, and a handle is formed at the front end of the key.
[0013] Preferably, the first heavy key plate is formed with a tooth root surface, the unlocking protrusion is formed on the tooth root surface, and in the unlocking position, the tooth root surface is against the upper end of the first slot.
[0014] Preferably, the upper portion of the second re-key plate is integrally overlapped with the lower portion of the first re-key plate.
[0015] The second lock bead is slidably connected to the first lock bead hole by arranging a lock shell, and the first lock bead hole and the second lock bead hole are formed on the lock core, the first lock bead can slide into the first lock bead hole, and the second lock bead is slidably connected in the second lock bead hole, the key is formed with a second key plate and the first key plate, the upper part of the second key plate is connected to the lower part of the first key plate, the upper end of the first key plate is formed with an unlocking convex tooth for inserting the first lock bead hole from the inside to the outside so as to push the first lock bead to the outer end of the first lock bead hole, and an unlocking recess is formed on one side of the second key plate, the outer end of the first lock bead is correspondingly provided with a first spring for pushing the first lock bead into the first lock bead hole, and the outer end of the lock shell marble is correspondingly provided with a second spring for pushing the inner end of the second lock bead into the unlocking recess, and an unlocking limiting structure for limiting the unlocking convex tooth to insert into the first lock bead hole is formed in the lock hole, so that the anti-theft performance of the double lock structure of the present invention is better. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the lock core and key combination of the present invention.
[0017] Figure 2 It is a schematic diagram of the exploded view of the lock core and the key of the present invention.
[0018] Figure 3 Based on Figure 1 Schematic diagram of the partially cutaway three-dimensional structure.
[0019] Figure 4 It is a schematic diagram of the front view structure of the lock core of the present invention.
[0020] Figure 5 It is a schematic diagram of the cross-sectional structure of the key of the present invention in the front view direction.
[0021] Figure 6 It is a schematic diagram of the cross-sectional structure of the lock housing and the lock core of the present invention in the front view direction when they are in a locked state.
[0022] Figure 7 This is a schematic diagram of a key of the present invention being inserted into a lock hole.
[0023] Figure 8 It is a schematic diagram of the unlocking state of the double lock structure of the present invention.
[0024] Explanation of reference numerals: lock core 1; lock hole 11; first slot 112; second slot 111; inner inverted step 113; inner straight step 114; first lock bead hole 12; first bead hole bottom edge 121; second lock bead hole 13; second bead hole bottom edge 131; key 2; handle 20; second lock key plate 21; unlocking recess 211; first lock key plate 22; unlocking convex tooth 221; tooth root surface 2211; outer straight step 201; outer inverted step 202; convex arc edge 203; lock shell 3; first lock bead 31; first spring 32; first plug 33; second lock bead 34; lock shell marble 35; second spring 36; second plug 37. DETAILED DESCRIPTION
[0025] The present invention will be further described below in conjunction with the accompanying drawings.
[0026] The double lock structure of the present invention is as follows: Figures 1 to 6 As shown, it includes a lock core 1, a key 2 and a lock shell 3. The lock core 1 can be rotatably arranged in the lock shell 3. For example, the lock core 1 is formed with an outer cylindrical surface, and the lock shell 3 is formed with an inner cylindrical surface. The outer cylindrical surface and the inner cylindrical surface are adapted to be closely connected. The lock core 1 is formed with a lock hole 11 for axial insertion of the key 2. The "axial direction" mentioned here refers to the direction parallel to (or approximately parallel to) the rotation axis of the lock core 1; for example, the rear end of the lock core 1 can be used to connect the lever. Figure 6 As shown, the lock housing 3 is slidably connected with a first lock ball 31 and a lock housing marble 35. Figure 2 As shown, the lock core 1 is formed with a first lock bead hole 12 and a second lock bead hole 13, so the first lock bead 31 can slide into the first lock bead hole 12, and the second lock bead 34 is slidably connected to the second lock bead hole 13. Figure 2 and Figure 5 As shown, the key 2 is formed with a second key plate 21 and a first key plate 22, the upper part of the second key plate 21 is connected to the lower part of the first key plate 22, and the combination structure of the second key plate 21 and the first key plate 22 is equivalent to putting two traditional keys together. Figure 2 , Figure 3 and Figure 8As shown, the upper end of the first heavy lock key plate 22 is formed with an unlocking convex tooth 221 for inserting the first heavy lock bead hole 12 from the inside to the outside to push the first heavy lock bead 31 to the outer end of the first heavy lock bead hole 12, that is, the lock hole 11 is connected to the first heavy lock bead hole 12. The "from inside to outside" mentioned above is relative to the rotation center of the lock core 1, so "from inside to outside" can be roughly along the radius of the lock core 1. An unlocking recess 211 is formed on one side of the second heavy lock key plate 21. Figure 6 As shown, the outer end of the first lock bead 31 is correspondingly provided with a first spring 32 for pushing the first lock bead 31 into the first lock bead hole 12, and the outer end of the lock shell marble 35 is correspondingly provided with a second spring 36 for pushing the inner end of the second lock bead 34 into the unlocking recess 211. That is to say, the lock hole 11 is connected to the second lock bead hole 13. Specifically, the lock shell 3 is formed with a first mounting hole and a second mounting hole. The first spring 32 is arranged in the first mounting hole, and the first lock bead 31 is adapted to be slidably arranged in the first mounting hole. The outer end of the first mounting hole is also provided with a first plug 33. The first plug 33 supports the elastic restoring force of the first spring 32. The lock shell marble 35 is adapted to be slidably arranged in the second mounting hole. The first spring 32 is arranged in the second mounting hole, and the outer end of the second mounting hole is provided with a second plug 37. As shown Figure 6 As shown, the second mounting hole can be perpendicular to the first mounting hole, that is, the first lock bead hole 12 is perpendicular to the second lock bead hole 13. An unlocking limit structure is formed in the lock hole 11 for limiting the insertion of the unlocking protruding tooth 221 into the first lock bead hole 12. That is to say, when the unlocking protruding tooth 221 moves from the inside to the outside, when the key 2 contacts the unlocking limit structure, the key 2 is limited, and the unlocking protruding tooth 221 is also limited at this time, so that the unlocking protruding tooth 221 can accurately lift the first lock bead 31. Figure 6 As shown, the lock core 1 has a locked position relative to the lock shell 3, that is, the lock core 1 cannot rotate relative to the lock shell 3 in this position. In the locked position, the inner end of the first lock bead 31 is located in the first lock bead hole 12 (the "inner end" mentioned here refers to the end of the first lock bead 31 that is relatively close to the rotation axis of the lock core 1), and the outer end of the first lock bead 31 is located in the lock shell 3, so the rotation of the lock core 1 will be blocked by the first lock bead 31. At this time, the outer cylindrical surface of the lock core 1 passes through the first lock bead 31, and the outer end of the second lock bead 34 is misaligned with the outer wall of the lock core 1 (that is, the outer cylindrical surface of the lock core 1), and the outer end of the second lock bead 34 is close to the inner end of the lock shell marble 35. Figure 6 In the example, the outer end of the second lock bead 34 can be located inside the outer cylindrical surface of the lock core 1. Of course, the outer end of the second lock bead 34 can also be located outside the outer cylindrical surface of the lock core 1. Since the outer end of the second lock bead 34 is misaligned with the outer wall of the lock core 1, the rotation of the lock core 1 will be blocked by the second lock bead 34 or the lock shell marble 35. Figure 8As shown, the key 2 has an unlocking position relative to the lock hole 11. In the unlocking position, the unlocking convex tooth 221 is inserted into the first lock bead hole 12, the inner end of the second lock bead 34 is inserted into the unlocking recess 211, and the outer end of the second lock bead 34 is flush with the outer wall of the lock core 1, and the key 2 is close to the unlocking limiting structure. As mentioned above, the unlocking convex tooth 221 inserted into the first lock bead hole 12 can push the first lock bead 31 to the outer end of the first lock bead hole 12. That is to say, in the above-mentioned unlocking position, the contact part of the unlocking convex tooth 221 and the first lock bead 31 is just located at the outer end of the first lock bead hole 12, that is, the contact part of the unlocking convex tooth 221 and the first lock bead 31 is just located at the outer cylindrical surface of the lock core 1. At this time, the first spring 32 is further compressed, and the inner end of the first lock bead 31 can form a conical head structure; Figure 8 As shown, the outer end of the second lock bead 34 can be a cylindrical surface matching the outer wall of the lock core 1; Figure 8 In the state shown, the lock core 1 can rotate relative to the lock housing 3.
[0027] The unlocking process of the double lock structure of the present invention is as follows: Figure 2 As shown, the key 2 is inserted into the lock hole 11, that is, the second key plate 21 and the first key plate 22 are inserted into the lock hole 11, and the handle 20 of the key 2 can contact the front end surface of the lock core 1, so that the key 2 is axially inserted into place, as shown in FIG. Figure 7 As shown, at this time, since the unlocking recess 211 of the second key plate 21 has not yet aligned with the second lock bead 34, the second key plate 21 pushes the second lock bead 34 outward, so that the outer end of the second lock bead 34 protrudes from the outer wall of the lock core 1, that is, the second lock has not yet been unlocked, and then the key 2 is lifted upward, so that the unlocking convex tooth 221 is inserted into the first lock bead hole 12 from the inside to the outside to push the first lock bead 31 to the outer end of the first lock bead hole 12. At the same time, the key 2 is blocked and limited by the unlocking limiting structure. At this time, the first lock The second lock core 1 is unlocked by the outer end of the second lock bead 34, and the second lock core 1 is unlocked by the outer end of the second lock bead 34. The second lock core 1 is unlocked by the outer end of the second lock bead 34, and the second lock core 1 is unlocked by the outer end of the second lock bead 34. Figure 8 In the embodiment shown, since the inner end of the second lock bead 34 is inserted into the unlocking recess 211, the key 2 cannot be pulled out of the lock core 1 in the unlocking state; in order to prevent the second lock bead 34 and the lock shell marble 35 from rotating, a structure guiding the lock shell marble 35 can be provided in the second mounting hole. Figure 8The position shown is that the first mounting hole is aligned with the first lock bead hole 12, the second mounting hole is aligned with the second lock bead hole 13, and then the key 2 is pushed downward to make the unlocking protruding tooth 221 disengage from the first lock bead hole 12, the elastic restoring force of the first spring 32 pushes the first lock bead 31 into the first lock bead hole 12, the second lock key plate 21 squeezes and pushes the second lock bead 34, and then the key 2 is pulled forward. Since the second lock bead 34 loses the obstruction of the key 2, the second lock bead 34 is reset to the position by the elastic restoring force of the second spring 36. Figure 6 Status shown.
[0028] The combination of the first and second locks of the present invention can increase the complexity of the lock structure and the unlocking action. Since the flat and soft structure of the tin foil strip is easy to form a groove, but it is difficult to simulate the action of the unlocking protrusion 221 inserting into the first lock bead hole 12, the double lock structure of the present invention is relatively difficult to be stolen, and the anti-theft performance of the double lock structure of the present invention is better. Figure 8 As shown in the position, the above unlocking limit structure also increases the difficulty of stealing.
[0029] Furthermore, if Figure 4 As shown, the lock hole 11 includes a second slot 111 and a first slot 112, the first heavy lock bead hole 12 is connected to the upper end of the first slot 112, the second heavy lock bead hole 13 is connected to the second slot 111, the second slot 111 and the first slot 112 are staggered left and right, the upper part of the second slot 111 is connected to the lower part of the first slot 112, so as to form the lock hole 11, as shown in FIG. Figure 4 As shown, the lock hole 11 is actually formed with an inverted step 113 and an inner positive step 114. Figure 7 As shown, the width of the second slot 111 is adapted to the thickness of the second re-key plate 21, and the width of the first slot 112 is adapted to the thickness of the first re-key plate 22. Figure 6 In the visual sense, the width of the second slot 111 refers to the width of the second slot 111 in the left-right direction, and the width of the first slot 112 refers to the width of the first slot 112 in the left-right direction. Figure 2 and Figure 5 As shown, the first key plate 22 and the second key plate 21 are also staggered left and right, so that the key 2 is formed with an outer positive step 201 and an outer inverted step 202; through the above arrangement, the lock hole 11 is a tortuous structure, which can increase the difficulty of the theft tool prying up and down in the lock hole 11, so that the double lock structure of the present invention has better anti-theft performance.
[0030] Furthermore, if Figure 4 and Figure 8As shown, the unlocking limit structure is set as the upper end of the second slot 111, and the upper end of the second key plate 21 can be abutted against the upper end of the second slot 111, that is, the unlocking limit structure is set as the inner step 113, specifically, the outer positive step 201 of the key 2 can be abutted against the inner step 113, that is to say, the zigzag lock hole 11 can also conveniently form a structure for limiting the outward movement of the unlocking convex tooth 221, which is beneficial to the simplification of the structure of the lock hole 11 and the key 2, and the structure of the inner step 113 is simple and stable, and is not easily worn out in daily use.
[0031] Furthermore, if Figure 7 As shown, the first re-key plate 22 is highly adapted to the first slot 112, that is, Figure 7 In the visual direction, the length of the first heavy key plate 22 is along the front-to-back direction, the thickness of the first heavy key plate 22 is along the left-right direction, and the height of the first heavy key plate 22 is along the up-down direction. Since the first heavy key plate 22 is highly adapted to the first slot 112, that is, the upper end of the first heavy key plate 22 (including the unlocking protruding tooth 221) is against the upper inner wall of the first slot 112, and the lower end of the first heavy key plate 22 (that is, Figure 5 The outer inverted step 202 in the first slot 112 is against the lower inner wall of the first slot 112 (i.e. Figure 4 In the inner positive step 114), through the above arrangement, as Figure 7 As shown, when the key 2 is inserted into the lock hole 11, the first slot 112 can guide the key 2 in a straight line, preventing the user from feeling that the lock hole 11 is loose, which is beneficial to improving the user experience.
[0032] Furthermore, if Figure 4 As shown, the inner end of the first lock bead hole 12 is formed with a first bead hole bottom edge 121 for limiting the first lock bead 31, and the inner end of the second lock bead hole 13 is formed with a second bead hole bottom edge 131 for limiting the second lock bead 34. The second bead hole bottom edge 131 is equivalent to an inner flange structure, such as Figure 6 As shown, when the key 2 is not inserted into the lock hole 11, the inner edge of the first lock bead 31 is pressed against the bottom edge 121 of the first bead hole through the elastic restoring force of the first spring 32, so that the first lock bead 31 can stay stably in the locked position. Similarly, in the locked position, the inner edge of the second lock bead 34 is pressed against the bottom edge 131 of the second bead hole.
[0033] Furthermore, if Figure 4As shown, the width of the first slot 112 (in the left-right direction) is smaller than the inner diameter of the first heavy locking bead hole 12, so the inner end of the first heavy locking bead hole 12 is connected to the upper end of the first slot 112, so the edge of the upper end of the first slot 112 can block and limit the first heavy locking bead 31, that is, the edge of the upper end of the first slot 112 can serve as the bottom edge 121 of the first bead hole, and the above-mentioned limiting structure is relatively simple and easy to process.
[0034] Furthermore, if Figure 2 As shown, the first lock bead hole 12 and the second lock bead hole 13 are arranged axially at intervals, so that Figure 3 As shown, correspondingly, the unlocking convex teeth 221 and the unlocking recesses 211 are arranged at intervals respectively. Specifically, the first lock bead holes 12 can be distributed at equal intervals, the first lock bead holes 12 can also be distributed at unequal intervals, and the unlocking recesses 211 can also be distributed at unequal intervals. Since each unlocking convex tooth 221 must correspond one-to-one with the first lock bead hole 12 to unlock the first lock, the difficulty of copying the key 2 is increased, and the difficulty of being stolen is also increased. Therefore, the double lock structure of the present invention has better anti-theft performance.
[0035] Furthermore, if Figure 2 As shown, a convex arc edge 203 is formed at the rear end of the key 2, and a handle 20 is formed at the front end of the key 2. In other words, the rear end edge of the key 2 is an arc edge, and the center of the arc of the convex arc edge 203 can be located in the middle position of the combination of the second key plate 21 and the first key plate 22 in the up and down direction. When the key 2 is inserted backward into the lock hole 11, if the convex arc edge 203 hits the lower end edge of the hole opening of the lock hole 11, the convex arc edge 203 can relatively guide the lower end edge of the hole opening of the lock hole 11, so that the key 2 can be guided to slide into the lock hole 11.
[0036] Furthermore, if Figure 2 As shown, the first re-key plate 22 is formed with a tooth root surface 2211, and the unlocking protruding tooth 221 is formed on the tooth root surface 2211. Figure 3 As shown, in the unlocking position mentioned above, the root surface 2211 is against the upper end of the first slot 112, so the upper end of the first slot 112 also plays a role in blocking the limit unlocking convex tooth 221. After the key 2 is inserted and pulled out for a long time, the outer positive step 201 may be worn, so the structure of the upper end limit root surface 2211 of the first slot 112 is supplementary, which is beneficial to increase the service life of the key 2.
[0037] Furthermore, if Figure 5As shown, the upper portion of the second key plate 21 is integrally overlapped with the lower portion of the first key plate 22, that is, the upper portion of the second key plate 21 is overlapped with the lower portion of the first key plate 22, and the upper portion of the second key plate 21 is integrally connected with the lower portion of the first key plate 22, thereby facilitating the improvement of the structural strength of the key 2. The second key plate 21 and the first key plate 22 can be formed on the same copper plate.
Claims
1. A double lock structure, comprising a lock core (1), a key (2) and a lock housing (3), wherein the lock core (1) is rotatably arranged in the lock housing (3), and the lock core (1) is formed with a lock hole (11) for axial insertion of the key (2), characterized in that: The lock shell (3) is slidably connected with a first lock bead (31) and a lock shell marble (35); the lock core (1) is formed with a first lock bead hole (12) and a second lock bead hole (13); the first lock bead (31) can slide into the first lock bead hole (12); the second lock bead hole (13) is slidably connected with a second lock bead (34); the key (2) is formed with a second key plate (21) and a first key plate (22); the upper part of the second key plate (21) is connected to the lower part of the first key plate (22); the upper end of the first key plate (22) is formed with a second key plate (21) for inserting the first lock bead hole (12) from the inside to the outside to lock the lock. The first lock bead (31) is pushed to the unlocking convex tooth (221) at the outer end of the first lock bead hole (12); an unlocking recess (211) is formed on one side of the second lock key plate (21); a first spring (32) for pushing the first lock bead (31) into the first lock bead hole (12) is correspondingly provided at the outer end of the first lock bead (31); a second spring (36) for pushing the inner end of the second lock bead (34) into the unlocking recess (211) is correspondingly provided at the outer end of the lock shell marble (35); and an unlocking limiting structure for limiting the unlocking convex tooth (221) to be inserted into the first lock bead hole (12) is formed in the lock hole (11); The lock core (1) has a locked position relative to the lock housing (3). In the locked position, the inner end of the first lock bead (31) is located in the first lock bead hole (12), the outer end of the first lock bead (31) is located in the lock housing (3), the outer end of the second lock bead (34) is offset from the outer wall of the lock core (1), and the outer end of the second lock bead (34) is in contact with the inner end of the lock housing marble (35); The key (2) has an unlocking position relative to the lock hole (11). In the unlocking position, the unlocking protrusion (221) is inserted into the first lock bead hole (12), the inner end of the second lock bead (34) is inserted into the unlocking recess (211), the outer end of the second lock bead (34) is flush with the outer wall of the lock core (1), and the key (2) is in close contact with the unlocking limit structure.
2. The double lock structure according to claim 1, characterized in that: The lock hole (11) comprises a second slot (111) and a first slot (112); the first heavy lock bead hole (12) is connected to the upper end of the first slot (112); the second heavy lock bead hole (13) is connected to the second slot (111); the second slot (111) and the first slot (112) are arranged to be staggered left and right; the upper part of the second slot (111) is connected to the lower part of the first slot (112); the width of the second slot (111) is adapted to the thickness of the second heavy key plate (21); and the width of the first slot (112) is adapted to the thickness of the first heavy key plate (22).
3. The double lock structure according to claim 2, characterized in that: The unlocking limiting structure is arranged at the upper end of the second slot (111), and the upper end of the second key plate (21) can be abutted against and connected to the upper end of the second slot (111).
4. The double lock structure according to claim 2 or 3, characterized in that: The first re-key plate (22) is highly adapted to the first slot (112).
5. The double lock structure according to any one of claims 1 to 3, characterized in that: The inner end of the first locking bead hole (12) is formed with a first bead hole bottom edge (121) for limiting the position of the first locking bead (31), and the inner end of the second locking bead hole (13) is formed with a second bead hole bottom edge (131) for limiting the position of the second locking bead (34).
6. The double lock structure according to claim 5, characterized in that: The width of the first slot (112) is smaller than the inner diameter of the first heavy bead locking hole (12).
7. The double lock structure according to any one of claims 1 to 3, characterized in that: The first-layer bead locking holes (12) and the second-layer bead locking holes (13) are respectively arranged axially at intervals.
8. The double lock structure according to any one of claims 1 to 3, characterized in that: The rear end of the key (2) is formed with a convex arc edge (203), and the front end of the key (2) is formed with a handle (20).
9. The double lock structure according to claim 2 or 3, characterized in that: The first heavy key plate (22) is formed with a tooth root surface (2211), the unlocking protruding tooth (221) is formed on the tooth root surface (2211), and in the unlocking position, the tooth root surface (2211) is in contact with the upper end of the first slot (112).
10. The double lock structure according to claim 2 or 3, characterized in that: The upper portion of the second key plate (21) is integrally overlapped with the lower portion of the first key plate (22).