Double-unlocking lock cylinder

Abstract

The invention relates to a double-unlocking lock cylinder which comprises a lock shell, a left lock container, a right lock container and a shifting wheel, and is mainly characterized in that a clutch transmission structure of the double-unlocking lock cylinder comprises a first clutch shaft and a second clutch shaft which are coaxially riveted together and can relatively stretch and retract, and shaft sleeves are arranged on the first clutch shaft and the second clutch shaft in a sleeving mode; the first clutch shaft and the second clutch shaft are provided with shaft discs which are of the same structure and limit the shaft sleeves to disengage, a first spring is arranged between the first clutch shaft and the shaft sleeves on the same side, a second spring is arranged between the second clutch shaft and the shaft sleeves on the same side, and a third spring is arranged between the two shaft sleeves. When a key is inserted into any end of the left lock cylinder or the right lock cylinder or two ends of the key are inserted into the left lock cylinder and the right lock cylinder at the same time, the shaft sleeves can move in a reciprocating mode relative to the shifting wheel, and therefore the left lock cylinder and the right lock cylinder can be locked and unlocked. At the moment, the dial wheel can be driven by the circumferential limiting structure to rotate so as to unlock.

Description

Technical Field

[0001] The invention relates to the field of lock cores, and in particular to a double-opening lock core. Background Art

[0002] In modern home security systems, traditional pin locks still play an important role. This type of lock usually consists of a lock shell and two horizontally arranged lock cylinders, which are connected to the lock fork through an internal component. After the key is inserted into the keyhole on either side, the pins are accurately matched and the internal component is pushed to the other side, so that the lock cylinder rotates, driving the lock fork to move, and finally completing the unlocking process. This mechanism ensures that the lock can be easily operated from both the inside and outside of the door.

[0003] With the development of technology and the actual needs of users, more complex double-opening lock core designs have emerged, such as the Chinese utility model patent CN 220247849 U published on December 26, 2023, which discloses a double-opening lock core, including a shell, a dial wheel, a left lock core and a right lock core accommodated in the shell and provided with a key insertion hole, and also including a clutch shaft located between the left lock core and the right lock core, the dial wheel is provided with a torsion hole that is circumferentially fixed with the clutch shaft for sliding cooperation, the clutch shaft is provided with a torsion portion that cooperates with the torsion hole, and left and right clutch protrusions are respectively provided at both ends of the clutch shaft; the left lock core and the right lock core are respectively provided with a left annular groove and a right annular groove that allow the left clutch protrusion and the right clutch protrusion to rotate, And a left axial groove and a right axial groove extending toward the thumbwheel and connected with the left annular groove and the right annular groove respectively; when the left clutch protrusion is accommodated in the left annular groove, the right axial groove engages with the right clutch protrusion, and when the right clutch protrusion is accommodated in the right annular groove, the left axial groove engages with the left clutch protrusion; when the left-side key of the left lock cylinder unlocks the left lock cylinder, the left-side key squeezes the left clutch protrusion to a position corresponding to the left axial groove; when the right-side key of the right lock cylinder unlocks the right lock cylinder, the right-side key squeezes the right clutch protrusion to a position corresponding to the right axial groove.

[0004] Although the lock core in the above-mentioned prior art can realize the function of unlocking both the inside and outside of the door, there are still certain problems. For example, after the key is inserted into the lock cylinder on one side, the first inserted key will push the lock cylinder to move toward the lock cylinder on the other side, so that the clutch shaft at the end where the key is not inserted moves to the outside of the torsion hole on the dial wheel. The first inserted key will then rotate, which will drive the dial wheel to rotate. After the dial wheel rotates, when the first inserted key is not taken out, the key is inserted into the other lock cylinder. The key inserted later will not be able to push the already misplaced dial wheel and clutch shaft to cooperate with the limit position of the lock cylinder on the other side, and the key inserted later will not be able to be fully inserted into the lock cylinder on that side. Since the clutch shaft position is fixed, the newly inserted key may not be able to be correctly positioned, and may even cause the key to break or get stuck, making the other side unable to operate normally. Or in the event of an accident, if the key breaks in one side of the lock cylinder or the keyhole of one side of the lock cylinder is blocked by foreign objects, the key on the other side cannot be turned, and the door cannot be opened or locked, which greatly reduces the safety and applicability of the door lock when in use, especially in situations where emergency escape is required, and there are major safety hazards. In addition, although the clutch shaft in the prior art has a simple structure, the clutch transmission structure is not stable enough, the precision is not accurate enough, and long-term use is prone to wear and unlocking failure, which poses certain safety hazards.

[0005] Therefore, how to overcome the above-mentioned defects has become an important issue to be solved urgently by those skilled in the art. Summary of the invention

[0006] The present invention overcomes the shortcomings of the above-mentioned technology and provides a double-opening lock core.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A double-opening lock cylinder comprises a lock shell, wherein the left and right lock cylinders of the same structure are connected to the left and right sides of the lock shell respectively, the left and right lock cylinders both have keyholes for inserting a key, a dial wheel is connected between the left and right lock cylinders, a clutch transmission structure is arranged inside the dial wheel, the clutch transmission structure comprises a first clutch shaft and a second clutch shaft which are coaxially riveted together and can be relatively telescopically movable, the first clutch shaft and the second clutch shaft are both sleeved with shaft sleeves, the first clutch shaft and the second clutch shaft have shaft disks of the same structure for limiting the shaft sleeves from coming out, and the A first spring is provided between the first clutch shaft and the sleeve on the same side, a second spring is provided between the second clutch shaft and the sleeve on the same side, and a third spring is provided between the two sleeves. One end of the sleeves on the left and right sides are respectively connected with the left lock gall and the right lock gall to limit the lock, and the other ends of the sleeves are respectively movably inserted into the dial wheel through the circumferential limiting structure. When the key is inserted into either end of the left lock gall or the right lock gall, or both ends are inserted into the left lock gall and the right lock gall at the same time, the sleeve can reciprocate relative to the dial wheel. At this time, the dial wheel can be driven to rotate through the circumferential limiting structure to unlock the lock.

[0009] Furthermore, the first spring, the second spring and the third spring have the same structure, the first spring is sleeved on the first clutch shaft, one end of the first spring abuts against the shaft disc of the first clutch shaft, and the right side and the other end abut against the inner wall surface of the shaft sleeve on the same side; the second spring is sleeved on the second clutch shaft, one end of the second spring abuts against the shaft disc of the second clutch shaft, and the left side and the other end abut against the inner wall surface of the shaft sleeve on the same side; the two ends of the third spring abut against the shaft sleeves on the left and right sides respectively.

[0010] Furthermore, a limiting ring is provided on the inner circumferential surface of the thumbwheel, the shaft sleeves are respectively arranged on both sides of the limiting ring, and the first clutch shaft and the second clutch shaft are arranged on the axis of the limiting ring.

[0011] Furthermore, the circumferential limiting structure includes a first limiting groove formed on the limiting ring, and the outer circumferential wall surface of the sleeve is extended outwardly to provide a limiting protrusion that can be inserted into the first limiting groove and cooperate with it, and the left lock core and the right lock core are respectively provided with a second limiting groove that is connected to the limiting protrusion for limiting cooperation.

[0012] Furthermore, the first limiting groove, the limiting protrusion and the second limiting groove are each provided in three numbers.

[0013] Furthermore, the first clutch shaft further includes a first shaft rod, and the second clutch shaft further includes a second shaft rod. The first shaft rod is hollow inside so that the second shaft rod can be movably mounted therein. The first shaft rod and the second shaft rod are riveted together through a riveting structure to prevent the two from being separated.

[0014] Furthermore, an annular blocking portion is provided at one end of the first shaft away from its shaft disk, and the annular blocking portion is concave inwardly along the inner wall surface of the first shaft, and an annular anti-slip slope is provided at one end of the second shaft away from its shaft disk. When the first shaft and the second shaft are relatively stretched to the maximum length, the annular anti-slip slope abuts against the wall surface of the annular blocking portion to limit the first shaft and the second shaft from detaching.

[0015] Furthermore, the left lock core, the right lock core, the dial wheel, the first clutch shaft, the second clutch shaft and the sleeve are all coaxially arranged.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In this case, a clutch transmission structure is provided, and the clutch cooperation of the first spring, the second spring and the third spring of the clutch transmission structure with the dial wheel and the sleeves on both sides ensures that when the key is inserted on either side, the sleeve at the other end can be pushed out of the dial wheel, so that the circumferential limit structure on this side fails, and one-sided unlocking is achieved at this time. The situation in the prior art that the circumferential limit cooperation on the other side cannot be performed after the dial wheel is driven to rotate will not occur. Therefore, even if there is a broken key in one side of the lock core, or it is blocked by foreign objects, or the internal structure of one side of the lock core is stuck during the opening process, the door lock can still be opened normally on the other side. The safety and applicability in emergency situations are significantly improved. For example, when a quick escape is required, the user can unlock the door smoothly from either side.

[0018] 2. This case adopts the riveting design of the coaxially riveted first clutch shaft and the second clutch shaft, and cooperates with the spring system composed of the shaft sleeve, the dial wheel, the first spring, the second spring, and the third spring to form a relatively telescopic and stable structure. In addition, the design of the shaft disc prevents the shaft sleeve from falling out, and the shaft sleeves on the left and right sides are respectively connected with the left and right lock cores to ensure the integrity and stability of the structure. The overall stability and accuracy of the clutch transmission structure are enhanced, the risk of wear caused by long-term use is reduced, the service life of the lock is extended, and the possibility of unlocking failure is reduced.

[0019] 3. When the key is inserted into both ends of the left and right lock cylinders at the same time, the left and right lock cylinders are driven to move horizontally toward the dial wheel at the same time under the pressure exerted by the keys on both sides, so that the shaft sleeves at both ends are driven to be pushed into the dial wheel. At this time, the circumferential limit structures on the left and right sides act at the same time, and the doors on both sides can be opened at the same time. The door lock can be opened with keys on both sides at the same time, which solves the problem that a key or foreign object is inserted in the lock cylinder on one side of the double lock cylinder and the door lock cannot be opened with the key on the other side, thereby improving the safety and applicability of the door lock when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall disassembled structure of the double-opening lock core in this case with the key.

[0021] Figure 2 It is a schematic diagram of the dial wheel and clutch transmission structure of this case.

[0022] Figure 3 It is a side view of the double lock cylinder in the keyless state of this case.

[0023] Figure 4 This case Figure 3 Section view in the AA direction.

[0024] Figure 5 This is a schematic diagram of the overall structural assembly status of the double-opening lock core in this case with a key. DETAILED DESCRIPTION

[0025] The features of the present invention and other related features are further described in detail below through embodiments to facilitate understanding by those skilled in the art:

[0026] like Figures 1 to 5 As shown, the present case discloses a double-opening lock core, including a lock shell 100. The left and right sides of the lock shell 100 are respectively connected with a left lock core 1 and a right lock core 2 of the same structure, and both the left lock core 1 and the right lock core 2 have keyholes 11 and 21 for inserting the key 200. The left lock core 1 and the right lock core 2 with the same structure enable the user to use the key to unlock the door from both the inside and outside of the door, thereby improving the convenience of the user. A thumbwheel 3 is connected between the left lock core 1 and the right lock core 2, and a clutch transmission structure is arranged in the thumbwheel 3. When unlocking, the user drives the left lock core 1 or the right lock core 2 or drives the left lock core 1 and the right lock core 2 at the same time by the key, thereby driving the clutch transmission structure in the thumbwheel 3 to perform a clutch action, and finally drives the thumbwheel 3 to rotate. The clutch transmission structure is the core component for realizing simultaneous unlocking of one side or both sides. The clutch transmission structure includes a first clutch shaft 4 and a second clutch shaft 5 which are coaxially riveted together and can be relatively telescopic and movable. The first clutch shaft 4 and the second clutch shaft 5 are both sleeved with a sleeve 6. The first clutch shaft 4 and the second clutch shaft 5 have shaft discs 41 and 51 with the same structure for limiting the sleeve 6 from coming out. A first spring 7 is arranged between the first clutch shaft 4 and the sleeve 6 on the same side, a second spring 8 is arranged between the second clutch shaft 5 and the sleeve 6 on the same side, and a third spring 9 is arranged between the two sleeves 6. The first clutch shaft 4 and the second clutch shaft 5 are relatively telescopic, and the position of the sleeve 6 is adjusted under different circumstances to ensure that the circumferential limiting structure on one or both sides can work normally, thereby enhancing the flexibility of the system, so that even if there is a key or foreign matter on one side, the other side can still be operated. One end of the sleeve 6 on the left and right sides is respectively connected with the left lock 1 and the right lock 2 in a limited position, and the other end of the sleeve 6 is respectively movably inserted into the dial wheel 3 through the circumferential limiting structure. It is arranged between the sleeve 6 and the dial wheel 3 to ensure that the sleeve 6 can drive the dial wheel 3 to rotate. When the key is inserted, the rotation of the thumbwheel 3 is activated by driving the lateral movement of the sleeve 6. The circumferential limit structure is in a circumferential limit state at this time, and the unlocking process can be completed, ensuring the reliability of the unlocking action, especially in an emergency, so that the user's needs can be quickly responded to. When the key 200 is inserted into either the left lock core 1 or the right lock core 2, or both ends are inserted into the left lock core 1 and the right lock core 2 at the same time, the sleeve 6 can reciprocate relative to the thumbwheel 3, and the thumbwheel 3 can be driven to rotate by the circumferential limit structure to unlock. Through this clutch transmission structure, the key 200 can be used to open the door lock at both indoor and outdoor sides at the same time, which solves the problem that a key or foreign object is inserted in the lock core on one side of the double lock core and the door lock cannot be opened by the key on the other side, thereby improving the safety and applicability of the door lock when in use.

[0027] When the key 200 is inserted into either end of the left lock cylinder 1 or the right lock cylinder 2, under the combined force of the first spring 7, the second spring 8 and the third spring, the sleeve 6 at the other end is pushed out of the dial wheel 3 and engaged in the lock cylinder on the other side. At this time, the circumferential limiting structure at the other end cannot play a role, and one-sided unlocking is achieved. It is suitable for one-sided unlocking, or emergency unlocking when the key at the other end is broken, blocked by foreign objects, or the internal structure of one side of the lock cylinder is stuck during the opening process.

[0028] When the key 200 is inserted into both ends of the left lock cylinder 1 and the right lock cylinder 2 at the same time, under the pressure applied by the keys 200 on both sides, the left lock cylinder 1 and the right lock cylinder 2 are driven to move horizontally toward the dial wheel 3 at the same time, so that the shaft sleeves 6 at both ends are driven to be pushed into the dial wheel 3. At this time, the circumferential limit structures on the left and right sides act at the same time, and the doors on both sides can be opened at the same time. The door lock can be opened with keys at both sides indoors and outdoors at the same time, which solves the problem that a key or foreign object is inserted in the lock cylinder on one side of the double lock cylinder and the door lock cannot be opened with the key on the other side, thereby improving the safety and applicability of the door lock when in use.

[0029] It should be noted that this case adopts the design of coaxial riveting of the first clutch shaft 4 and the second clutch shaft 5, which is applied to the clutch transmission structure of this case. The clutch shaft in the traditional double-opening lock core usually adopts a simple sliding fit or a single-point connection method. This design is prone to wear and loosening during long-term use, which in turn affects the transmission accuracy and reliability. By coaxially riveting the first clutch shaft 4 and the second clutch shaft 5 together, a more integrated component is formed. This design not only improves the firmness of the mechanical connection, but also ensures that the relative position between the two shafts is fixed, reducing the risk of displacement caused by vibration or impact. This structural improvement effectively enhances the stability and durability of the entire clutch transmission system, extends the service life of the lock, reduces the failure rate caused by loose or falling components, and reduces the user's maintenance cost and time.

[0030] Secondly, the traditional clutch shaft design may not guarantee accurate telescopic movement under different working conditions (such as single-sided or double-sided operation at the same time), which may cause the other side to fail to respond correctly when one side is operated, or even cause a jam. In this case, the coaxially riveted first clutch shaft 4 and second clutch shaft 5 can move in relative telescopic movement, and dynamic balance is achieved through the spring system (first spring 7, second spring 8 and third spring 9). Regardless of which side the key 200 is inserted into, the sleeve 6 on the other side can be pushed out of the dial wheel 3 accordingly without affecting the operation of the other side. Each operation can ensure accurate transmission, avoid jams or failures, and provide a more reliable user experience.

[0031] like Figure 1 , Figure 2 , Figure 4As shown, in order to facilitate manufacturing, production, installation, and provide stable elastic force, in specific implementation, the first spring 7, the second spring 8 and the third spring 9 have the same structure, that is, the size, dimensions, and elastic force are the same, so that they can respond with consistent speed and force, avoiding the situation where one side reacts too quickly and the other side reacts slowly, and the stability is better. The first spring 7 is sleeved on the first clutch shaft 4, one end of the first spring 7 abuts against the right side of the shaft disk 41 of the first clutch shaft 4, and the other end abuts against the inner wall surface of the same side sleeve 6. When the key 200 is inserted into the left lock core 1, the first spring 7 is compressed, pushing the sleeve 6 to move to the right, ensuring that the sleeve 6 can push out the dial wheel 3, making the left circumferential limit structure invalid. In the state without the key 200, the first spring 7 resets the sleeve 6 through its elastic force, preparing for the next operation. The first spring 7 provides a reliable reset mechanism to ensure that the system can return to the initial state after each operation, enhancing flexibility and response speed. The second spring 8 is sleeved on the second clutch shaft 5, and one end of the second spring 8 abuts against the left side of the shaft disc 51 of the second clutch shaft 5, and the other end abuts against the inner wall surface of the sleeve 6 on the same side. When the key 200 is inserted into the right lock core 2, the second spring 8 is compressed, pushing the sleeve 6 to move to the left, ensuring that the sleeve 6 can push out the dial wheel 3, so that the right circumferential limit structure fails. In the keyless state, the second spring 8 resets the sleeve 6 by its elastic force, ready for the next operation. The second spring 8 also provides a reliable reset mechanism, ensuring that the system can return to the initial state after each operation, enhancing flexibility and response speed. The two ends of the third spring 9 are respectively abutted against the sleeves 6 on the left and right sides. When the key 200 is inserted into the left lock core 1 and the right lock core 2 at the same time, under the pressure applied by the key 200, the sleeves 6 at both ends are pushed into the dial wheel 3, and the third spring 9 is compressed at this time. In the keyless state, the third spring 9 pushes the sleeves 6 on both sides outward by its elastic force to ensure that the sleeves 6 can be correctly reset. The third spring 9 ensures coordination when both sides are unlocked simultaneously, avoids one side affecting the operation of the other side, provides additional stability and balance, and enhances the reliability of the overall system.

[0032] It should be particularly emphasized that the design of adding the third spring 9 is for emergency unlocking when the internal structure of one side of the lock core is stuck during the unlocking process, and the elastic force of the first spring 7 or the second spring 8 is insufficient to forcibly push the sleeve 6 at the stuck end out of the dial wheel 3. By adding the third spring 9 to further increase the elastic force, the sleeve 6 at the stuck end is forcibly pushed out of the dial wheel 3 under the combined force of the first spring 7 or the second spring 8, so that the sleeve 6 at the other side is separated from the dial wheel 3 to release the limit cooperation of the circumferential limit structure of the two. At this time, the circumferential limit structure at the stuck end cannot play a role, thereby achieving emergency unlocking.

[0033] like Figure 1 , Figure 2 , Figure 4As shown, a limiting ring 31 is provided on the inner circumferential surface of the thumbwheel 3, and the sleeves 6 are respectively arranged on both sides of the limiting ring 31. The limiting ring 31 is used to separate the sleeves 6 on the left and right sides to prevent the two from interfering with each other, thereby affecting the action of the clutch transmission structure. At the same time, it provides an installation point and a support point as well as an activity space for the left and right sleeves 6 to ensure the stability and accuracy of the clutch transmission structure during action. The first clutch shaft 4 and the second clutch shaft 5 are arranged at the axis of the limiting ring 31, which ensures the coaxiality between the first clutch shaft 4 and the second clutch shaft 5 and the thumbwheel 3, so that the two can maintain precise concentric motion during rotation, eliminating the extra friction and wear caused by eccentricity, and improving the transmission efficiency.

[0034] Specifically, continue to refer to Figure 1 , Figure 2 , Figure 4 As shown, the circumferential limiting structure includes a first limiting groove 311 provided on the limiting ring 31, and the outer circumferential wall surface of the sleeve 6 is extended outwardly to be provided with a limiting protrusion 61 that can be inserted into the first limiting groove 311 and limitedly matched therewith. Through the cooperation of the first limiting groove 311 and the limiting protrusion 61, the circumferential limiting of the sleeve 6 and the dial wheel 3 is realized, so that the dial wheel 3 can be driven by the sleeve 6 to rotate to unlock. The left lock gall 1 and the right lock gall 2 are respectively provided with second limiting grooves 12 and 22 that are connected with the limiting protrusion 61 in a limited manner. Through the cooperation of the second limiting grooves 12 and 22 and the limiting protrusion 61, the circumferential limiting of the sleeve 6 and the left lock gall 1 and the right lock gall 2 is realized, so that the key 200 can be inserted into the left lock gall 1 and the right lock gall 2 and the key can be turned, thereby driving the sleeve 6 and driving the dial wheel 3 to rotate to unlock. When the user inserts the key into the left lock core 1 or the right lock core 2, the left lock core 1 or the right lock core 2 is driven to move forward, so that the limiting protrusion 61 is inserted into the second limiting groove 12, 22 for limiting cooperation, and then the limiting protrusion 61 is inserted into the first limiting groove 311 for limiting cooperation, and then the lock can be unlocked by turning the key 200. Under normal conditions, the limiting protrusion 61 and the first limiting groove 311 and the second limiting groove 12, 22 are all in a non-circumferential limiting cooperation state, that is, a disengaged state.

[0035] Further, continue to refer to Figure 1 , Figure 2 , Figure 4 As shown, there are three first limit grooves 311, limit protrusions 61 and second limit grooves 12, 22. The limit fit in the existing design is generally that two first limit grooves 311 and second limit grooves 12, 22 correspond to two limit protrusions 61. In this case, by adding a new first limit groove 311 and second limit grooves 12, 22 and limit protrusion 61, a fool-proof effect is played, the efficiency and accuracy of assembly are improved, installation and use are convenient, and at the same time, the rotation angle of the key 200 to unlock is effectively limited and determined, reducing the risk of operational errors.

[0036] like Figure 1 , Figure 4 As shown, the first clutch shaft 4 also includes a first shaft rod 42, and the second clutch shaft 5 also includes a second shaft rod 52. The first shaft rod 42 is hollow inside so that the second shaft rod 52 can be movably sleeved therein, and the first shaft rod 42 and the second shaft rod 52 are riveted by a riveting structure to prevent the two from being separated. Through the design of the above structure, the relative telescopic movement between the first clutch shaft 4 and the second clutch shaft 5 is realized, ensuring that they can respond flexibly under different operating conditions (such as single-sided or double-sided unlocking). The first shaft rod 42 and the second shaft rod 52 are connected by riveting to ensure that the two shaft rods will not be accidentally separated during use, thereby enhancing the integrity and reliability of the system, improving the overall stability and durability of the clutch transmission structure, and reducing the risk of wear caused by long-term use. At the same time, it can effectively cooperate with the spring system (first spring 7, second spring 8 and third spring 9) to ensure that the system can return to the initial state after each operation, providing a reliable reset mechanism.

[0037] like Figure 1 , Figure 4 As shown, specifically, an annular blocking portion 421 is provided at one end of the first shaft rod 42 away from its shaft disc 41, 51, and the annular blocking portion 421 is concavely arranged inwardly along the inner wall surface of the first shaft rod 42, and an annular anti-slip slope 521 is provided at one end of the second shaft rod 52 away from its shaft disc 41, 51. When the first shaft rod 42 and the second shaft rod 52 are relatively stretched to the maximum length, the annular anti-slip slope 521 abuts against the wall surface of the annular blocking portion 421 to limit the first shaft rod 42 and the second shaft rod 52 from separating. In specific implementation, it is necessary to use precise structural design to make the slope of the anti-slip slope 521 slightly larger than the blocking portion 421 to prevent the two from separating. The above-mentioned structural design ensures that even in extreme cases, the first shaft rod 42 and the second shaft rod 52 will not be completely separated, and prevents accidental separation caused by excessive external force, thereby effectively maintaining the integrity, stability and durability of the clutch transmission structure.

[0038] Furthermore, the left lock core 1, the right lock core 2, the dial wheel 3, the first clutch shaft 4, the second clutch shaft 5 and the sleeve 6 are all coaxially arranged. In this way, it is ensured that each component can maintain precise concentric motion during the rotation process, eliminating the extra friction and wear caused by eccentricity, improving the transmission efficiency, reducing energy loss, improving the mechanical accuracy of the system, and reducing the operation error caused by eccentricity.

[0039] As mentioned above, this case protects a double-opening lock cylinder. All technical solutions that are the same or similar to this case should be considered to fall within the protection scope of this case.

Claims

1. A double-opening lock cylinder, comprising a lock shell (100), wherein a left lock cylinder (1) and a right lock cylinder (2) of the same structure are respectively connected to the left and right sides of the lock shell (100), wherein the left lock cylinder (1) and the right lock cylinder (2) both have keyholes (11, 21) for inserting a key (200), a thumbwheel (3) is connected between the left lock cylinder (1) and the right lock cylinder (2), and a clutch transmission structure is arranged inside the thumbwheel (3), characterized in that: The clutch transmission structure comprises a first clutch shaft (4) and a second clutch shaft (5) which are coaxially riveted together and can be relatively telescopically movable, the first clutch shaft (4) and the second clutch shaft (5) are both sleeved with shaft sleeves (6), the first clutch shaft (4) and the second clutch shaft (5) have shaft disks (41, 51) of the same structure for limiting the shaft sleeve (6) from coming out, a first spring (7) is provided between the first clutch shaft (4) and the shaft sleeve (6) on the same side, a second spring (8) is provided between the second clutch shaft (5) and the shaft sleeve (6) on the same side, and the two A third spring (9) is provided between the shaft sleeves (6), one end of the shaft sleeves (6) on the left and right sides are respectively connected with the left lock core (1) and the right lock core (2) in a limiting manner, and the other end of the shaft sleeve (6) is respectively movably plugged into the dial wheel (3) through a circumferential limiting structure. When the key (200) is inserted into either end of the left lock core (1) or the right lock core (2), or both ends are inserted into the left lock core (1) and the right lock core (2) at the same time, the shaft sleeve (6) can reciprocate relative to the dial wheel (3), and at this time, the dial wheel (3) can be driven to rotate through the circumferential limiting structure to unlock the lock.

2. A double-opening lock cylinder according to claim 1, characterized in that: The first spring (7), the second spring (8) and the third spring (9) have the same structure. The first spring (7) is sleeved on the first clutch shaft (4), one end of the first spring (7) abuts against the right side of the shaft disc (41) of the first clutch shaft (4), and the other end abuts against the inner wall surface of the shaft sleeve (6) on the same side; the second spring (8) is sleeved on the second clutch shaft (5), one end of the second spring (8) abuts against the left side of the shaft disc (51) of the second clutch shaft (5), and the other end abuts against the inner wall surface of the shaft sleeve (6) on the same side; and the two ends of the third spring (9) abut against the shaft sleeves (6) on the left and right sides respectively.

3. A double-opening lock cylinder according to claim 1, characterized in that: A limiting ring (31) is provided on the inner circumferential surface of the thumbwheel (3), the shaft sleeves (6) are respectively arranged on both sides of the limiting ring (31), and the first clutch shaft (4) and the second clutch shaft (5) are arranged on the axis of the limiting ring (31).

4. A double-opening lock cylinder according to claim 3, characterized in that: The circumferential limiting structure comprises a first limiting groove (311) formed on a limiting ring (31); a limiting protrusion (61) is extended outwardly from the outer circumferential wall of the sleeve (6) and is capable of being inserted into the first limiting groove (311) and engaging with the first limiting groove (311); and second limiting grooves (12, 22) are respectively formed on the left lock core (1) and the right lock core (2) and are engaged with the limiting protrusion (61).

5. A double-opening lock cylinder according to claim 4, characterized in that: Three of each of the first limiting groove (311), the limiting protrusion (61) and the second limiting groove (12, 22) are provided.

6. A double-opening lock cylinder according to claim 1, characterized in that: The first clutch shaft (4) further comprises a first shaft rod (42), and the second clutch shaft (5) further comprises a second shaft rod (52). The first shaft rod (42) is hollow inside so that the second shaft rod (52) can be movably sleeved therein. The first shaft (42) and the second shaft (52) are riveted together by a riveting structure to prevent the two from being separated.

7. A double-opening lock cylinder according to claim 6, characterized in that: An annular blocking portion (421) is provided at one end of the first shaft (42) away from its shaft disc (41, 51), and the annular blocking portion (421) is concavely arranged inwardly along the inner wall surface of the first shaft (42); an annular anti-slip slope (521) is provided at one end of the second shaft (52) away from its shaft disc (41, 51); when the first shaft (42) and the second shaft (52) are relatively stretched to a maximum length, the annular anti-slip slope (521) abuts against the wall surface of the annular blocking portion (421) to limit the first shaft (42) and the second shaft (52) from detaching.

8. A double-opening lock cylinder according to claim 1, characterized in that: The left lock core (1), the right lock core (2), the thumbwheel (3), the first clutch shaft (4), the second clutch shaft (5) and the shaft sleeve (6) are all coaxially arranged.

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