Double-opening lock cylinder

Abstract

The present application relates to a double-opening lock cylinder, comprising a housing, a left cylinder core, a right cylinder core, and a cam. The main improvement comprises: a clutch transmission structure of the present application comprises a first clutch shaft and a second clutch shaft that are coaxially riveted together and can telescopically move relative to each other; shaft sleeves are respectively sleeved on the first clutch shaft and the second clutch shaft; the first clutch shaft and the second clutch shaft have shaft disks having the same structure and restricting the shaft sleeves from disengaging; a first spring is provided between the first clutch shaft and the shaft sleeve on the same side, a second spring is provided between the second clutch shaft and the shaft sleeve on the same side, and a third spring is provided between the two shaft sleeves; one end of the shaft sleeve on the left side and one end of the shaft sleeve on the right side are respectively in limiting fit and connection with the left cylinder core and the right cylinder core, and the other ends of the shaft sleeves are respectively movably inserted into the cam by means of circumferential limiting structures; and when a key is inserted into either the left cylinder core or the right cylinder core, or keys are inserted into the left cylinder core and the right cylinder core simultaneously, the shaft sleeves can reciprocate relative to the cam, and in this case, the cam can be driven to rotate by means of the circumferential limiting structures so as to achieve unlocking.

Description

A double-opening lock cylinder Technical Field

[0001] This invention relates to the field of lock cylinders, and more specifically to a double-opening lock cylinder. Background Technology

[0002] In modern home security systems, traditional pin tumbler locks still hold an important position. These locks typically consist of a lock case and two horizontally arranged lock cylinders, connected to the cylinder head fork via an internal assembly. When the key is inserted into either keyhole, precisely matching the pins and pushing the internal assembly to the other side rotates the lock cylinder, actuating the cylinder head fork and ultimately unlocking the door. This mechanism ensures convenient operation of the lock from both inside and outside the door.

[0003] With the development of technology and the actual needs of users, more complex double-lock cylinder designs have emerged. For example, Chinese utility model patent CN 220247849 U, published on December 26, 2023, discloses a double-lock cylinder including a housing, a dial, a left lock cylinder and a right lock cylinder housed within the housing and equipped with a keyhole, and a clutch shaft located between the left and right lock cylinders. The dial has a torsion hole that slides and is circumferentially fixed to the clutch shaft. The clutch shaft has a torsion part that mates with the torsion hole. The clutch shaft has a left clutch protrusion and a right clutch protrusion at its two ends. The left and right lock cylinders each have a left annular groove and a right annular groove that allow the left and right clutch protrusions to rotate. And left axial grooves and right axial grooves extending toward the dial wheel, respectively communicating with the left annular groove and the right annular groove; when the left clutch protrusion is accommodated in the left annular groove, the right axial groove engages the right clutch protrusion, and when the right clutch protrusion is accommodated in the right annular groove, the left axial groove engages the left clutch protrusion; when the left key of the left lock cylinder unlocks the left lock cylinder, the left key presses the left clutch protrusion to the position corresponding to the left axial groove; when the right key of the right lock cylinder unlocks the right lock cylinder, the right key presses the right clutch protrusion to the position corresponding to the right axial groove.

[0004] While the existing lock cylinder described above enables unlocking from both the inside and outside of the door, it still has certain problems. For example, if a key is inserted into one side of the cylinder first, the first key will push the cylinder to the other side, causing the clutch shaft at the end where the key is not inserted to move outside the turning hole on the dial. If the first key is then turned, it will drive the dial to rotate. After the dial rotates, if a key is inserted into the other side of the cylinder while the first key is still in place, the second key will not be able to push the misaligned dial and clutch shaft to engage with the other side of the cylinder. The second key cannot be fully inserted into the cylinder on that side. Since the clutch shaft position is fixed, the newly inserted key may not be able to be correctly positioned, or it may even break or get stuck, making it impossible to operate normally on the other side. In unexpected situations, such as a key breaking in one side of the lock cylinder or a keyhole on one side being blocked by a foreign object, the key on the other side cannot be turned, making it impossible to open or lock the door. This significantly reduces the security and usability of the lock, posing a considerable safety hazard, especially in emergency escape situations. Furthermore, while the clutch shaft in existing technology has a simple structure, its clutch transmission mechanism is not stable enough and lacks precision. Long-term use can easily lead to wear and tear, causing unlocking failure and posing certain safety risks.

[0005] Therefore, overcoming the aforementioned shortcomings has become an important issue that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0006] This invention overcomes the shortcomings of the above-mentioned technologies and provides a double-opening lock cylinder.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A double-lock cylinder includes a lock shell, with a left and right lock cylinder of the same structure connected to its left and right sides respectively. Both the left and right lock cylinders have keyholes for key insertion. A dial is connected between the left and right lock cylinders, and the dial contains a clutch transmission structure. The clutch transmission structure includes a first clutch shaft and a second clutch shaft coaxially riveted together and capable of relative telescopic movement. Each of the first and second clutch shafts is fitted with a bushing. The first and second clutch shafts have identical bearing discs that prevent the bushings from disengaging. A first spring is provided between the first clutch shaft and the bushing on the same side, a second spring is provided between the second clutch shaft and the bushing on the same side, and a third spring is provided between the two bushings. One end of the bushings on the left and right sides is respectively connected to the left and right lock cylinders in a limiting engagement. The other end of the bushings is respectively movably inserted into the dial wheel through a circumferential limiting structure. When a key is inserted into either the left or right lock cylinder, or both ends are inserted into the left and right lock cylinders simultaneously, the bushing 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, with one end abutting against the shaft disc of the first clutch shaft, and the right side and the other end abutting against the inner wall surface of the bushing on the same side. The second spring is sleeved on the second clutch shaft, with one end abutting against the shaft disc of the second clutch shaft, and the left side and the other end abutting against the inner wall surface of the bushing on the same side. The two ends of the third spring abut against the bushings on the left and right sides, respectively.

[0010] Furthermore, a limiting ring is provided on the inner circumferential surface of the dial wheel, the bushings are respectively disposed on both sides of the limiting ring, and the first clutch shaft and the second clutch shaft are disposed 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 of the bushing extends outward to be provided with a limiting protrusion that can be inserted into the first limiting groove and limited and cooperated with it. The left and right locking cylinders are each provided with a second limiting groove that is limited and connected to the limiting protrusion.

[0012] Furthermore, there are three of each of the first limiting groove, the limiting protrusion, and the second limiting groove.

[0013] Furthermore, the first clutch shaft also includes a first shaft, and the second clutch shaft also includes a second shaft. The first shaft is hollow inside to allow the second shaft to be movably fitted therein. The first shaft and the second shaft are riveted together by a riveting structure to prevent them from separating.

[0014] Furthermore, an annular blocking portion is provided at the end of the first shaft away from its shaft disc, and the annular blocking portion is recessed inward along the inner wall of the first shaft. An annular anti-detachment ramp is provided at the end of the second shaft away from its shaft disc. When the first shaft and the second shaft are stretched to their maximum length relative to each other, the annular anti-detachment ramp abuts against the wall of the annular blocking portion to prevent the first shaft and the second shaft from detaching.

[0015] Furthermore, the left locking cylinder, right locking cylinder, dial wheel, first clutch shaft, second clutch shaft, and bushing are all coaxially arranged.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This design employs a clutch-driven transmission structure. The first, second, and third springs of this structure, along with the engaging and disengaging action of the dial wheel and the bushings on both sides, ensure that when a key is inserted on either side, the bushing on the other side is pushed out of the dial wheel, rendering the circumferential limiting structure on that side ineffective. This achieves single-sided unlocking, avoiding the situation in existing technologies where one side's dial wheel rotates but the other side cannot achieve circumferential limiting action. Therefore, even in emergency unlocking situations where a key is broken in one lock cylinder, blocked by foreign objects, or the internal structure of one lock cylinder is jammed during opening, the other side can still be opened normally. This significantly improves safety and applicability in emergency situations; for example, in situations requiring rapid escape, the user can easily unlock from either side.

[0018] 2. This design employs a coaxial riveting design for the first and second clutch shafts, combined with a bushing, a shift wheel, and a spring system consisting of a first, second, and third spring, forming a stable structure with relatively telescopic movement. Furthermore, the shaft disc design prevents the bushing from dislodging, while the bushings on the left and right sides are respectively connected to the left and right lock cylinders for limiting engagement, ensuring the integrity and stability of the structure. This enhances the overall stability and precision of the clutch transmission structure, reduces the risk of wear due to long-term use, extends the lock's service life, and lowers the possibility of unlocking failure.

[0019] 3. When the keys are simultaneously inserted into both ends of the left and right lock cylinders, the pressure applied by both keys drives the left and right lock cylinders to move laterally towards the dial wheel. This pushes the bushings at both ends into the dial wheel. At this time, the circumferential limiting structures on both sides act simultaneously, allowing the door to be opened from both sides at the same time. This allows the door to be opened simultaneously from both inside and outside, solving the problem of a key or foreign object being inserted in one lock cylinder while the other cannot be opened, thus improving the safety and usability of the door lock. Attached Figure Description

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

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

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

[0023] Figure 4 is a cross-sectional view along direction AA in Figure 3 of this case.

[0024] Figure 5 is a schematic diagram of the overall structural assembly state of the double-lock cylinder with key in this case. Detailed Implementation

[0025] The following examples further illustrate the features and other related characteristics of the present invention in detail, to facilitate understanding by those skilled in the art:

[0026] As shown in Figures 1 to 5, this invention discloses a double-lock cylinder, including a lock housing 100. A left lock cylinder 1 and a right lock cylinder 2 with identical structures are connected to the left and right sides of the lock housing 100, respectively. Both the left and right lock cylinders 1 and 2 have keyholes 11 and 21 for inserting a key 200. The identical structures of the left and right lock cylinders 1 and 2 allow users to unlock the door from both the inside and outside, improving user convenience. A dial 3 connects the left and right lock cylinders 1 and 2, and the dial 3 contains a clutch transmission mechanism. When unlocking, the user drives the left lock cylinder 1 or the right lock cylinder 2, or both simultaneously, using the key. This drives the clutch transmission mechanism in the dial 3 to engage and disengage, ultimately rotating the dial 3. The clutch transmission mechanism is the core component for enabling simultaneous unlocking from one or both sides. The clutch transmission structure includes a first clutch shaft 4 and a second clutch shaft 5 coaxially riveted together and capable of relative telescopic movement. Both the first clutch shaft 4 and the second clutch shaft 5 are fitted with bushings 6. The first clutch shaft 4 and the second clutch shaft 5 have identical bearing discs 41 and 51 that restrict the disengagement of the bushings 6. A first spring 7 is provided between the first clutch shaft 4 and the bushing 6 on the same side, a second spring 8 is provided between the second clutch shaft 5 and the bushing 6 on the same side, and a third spring 9 is provided between the two bushings 6. The relative telescopic movement of the first clutch shaft 4 and the second clutch shaft 5 adjusts the position of the bushings 6 under different conditions, ensuring that the circumferential limiting structure on one or both sides can function normally, enhancing the system's flexibility and allowing operation on the other side even if a key or foreign object is present on one side. One end of the bushings 6 on the left and right sides is respectively connected to the left lock cylinder 1 and the right lock cylinder 2 for limiting engagement, while the other end of the bushings 6 is movably inserted into the dial wheel 3 through the circumferential limiting structure. These bushings are positioned between the bushings 6 and the dial wheel 3 to ensure that the bushings 6 can drive the dial wheel 3 to rotate. When the key is inserted, the lateral movement of the drive sleeve 6 activates the rotation of the dial wheel 3. The circumferential limiting structure is then in a circumferential limiting state, completing the unlocking process and ensuring the reliability of the unlocking action. This is especially beneficial in emergencies, allowing for a rapid response to user needs. When the key 200 is inserted into either the left cylinder 1 or the right cylinder 2, or both cylinders are inserted simultaneously, the sleeve 6 reciprocates relative to the dial wheel 3. The circumferential limiting structure then drives the dial wheel 3 to rotate, thus unlocking the door. This clutch-transmission structure allows the door lock to be opened simultaneously from both inside and outside with the key 200, resolving the issue of a key or foreign object being inserted in one lock cylinder while the other cannot be opened with a key, thus improving the safety and usability of the door lock.

[0027] When key 200 is inserted into either the left cylinder 1 or the right cylinder 2, under the combined force of the first spring 7, the second spring 8 and the third spring, the bushing 6 at the other end is pushed out and engaged with the dial wheel 3 inside the cylinder on the other side. At this time, the circumferential limiting structure at the other end cannot function, thus achieving single-sided unlocking. This method is suitable for single-sided unlocking, or for emergency unlocking when the key at the other end is broken, blocked by foreign objects, or when the internal structure of one side of the cylinder is jammed during the opening process.

[0028] When keys 200 are simultaneously inserted into both ends of the left and right lock cylinders 1 and 2, the pressure applied by both keys 200 simultaneously drives the left and right lock cylinders 1 and 2 to move laterally towards the dial wheel 3. This causes the bushings 6 at both ends to be pushed into the dial wheel 3. At this time, the circumferential limiting structures on both sides act simultaneously, allowing the door to be opened from both sides at the same time. This satisfies the requirement that the door lock can be opened simultaneously from both inside and outside, solving the problem of a key or foreign object being inserted in one lock cylinder while the other cannot be opened with a key, thus improving the safety and usability of the door lock.

[0029] It is worth noting that this design employs a coaxial riveting connection between the first clutch shaft 4 and the second clutch shaft 5, applied to the clutch transmission structure. Traditional double-lock cylinders typically use a simple sliding fit or single-point connection for the clutch shaft. This design is prone to wear and loosening during long-term use, affecting transmission accuracy and reliability. By coaxially riveting the first clutch shaft 4 and the second clutch shaft 5 together, a more robust and integrated component is formed. This design not only improves the strength of the mechanical connection but also ensures that the relative position between the two shafts remains constant, reducing the risk of displacement due to vibration or impact. This structural improvement effectively enhances the stability and durability of the entire clutch transmission system, extends the lock's lifespan, reduces the failure rate caused by loose or detached components, and decreases user maintenance costs and time.

[0030] Secondly, traditional clutch shaft designs may not guarantee precise extension and retraction under different operating conditions (such as simultaneous operation on one or both sides). This could lead to the other side not responding correctly or even jamming when one side is operating. In this design, the coaxially riveted first clutch shaft 4 and second clutch shaft 5 can extend and retract relative to each other, and dynamic balance is achieved through a spring system (first spring 7, second spring 8, and third spring 9). Regardless of which side the key 200 is inserted on, the bushing 6 on the other side can be correspondingly pushed out of the dial 3 without affecting the operation on the other side. Accurate transmission is guaranteed for every operation, avoiding jamming or malfunction and providing a more reliable user experience.

[0031] As shown in Figures 1, 2, and 4, to facilitate manufacturing, production, and installation, and to provide stable elastic force, the first spring 7, the second spring 8, and the third spring 9 are structurally identical, meaning they are the same size, dimensions, and elastic force. This ensures a consistent response speed and force, avoiding situations where one side reacts too quickly while the other reacts slowly, resulting in better stability. The first spring 7 is sleeved on the first clutch shaft 4, with one end abutting against the right side of the shaft disc 41 of the first clutch shaft 4, and the other end abutting against the inner wall of the sleeve 6 on the same side. When the key 200 is inserted into the left lock cylinder 1, the first spring 7 is compressed, pushing the sleeve 6 to the right, ensuring that the sleeve 6 can push out the dial wheel 3, thus disabling the left circumferential limiting structure. In the keyless state, the first spring 7 resets the sleeve 6 using its elastic force, preparing for the next operation. The first spring 7 provides a reliable reset mechanism, ensuring that the system returns to its initial state after each operation, enhancing flexibility and response speed. 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 of the bushing 6 on the same side. When the key 200 is inserted into the right lock cylinder 2, the second spring 8 is compressed, pushing the bushing 6 to the left, ensuring that the bushing 6 can push out the dial 3, thus disabling the right circumferential limiting structure. In the keyless state, the second spring 8 resets the bushing 6 with its elastic force, preparing for the next operation. The second spring 8 also provides a reliable reset mechanism, ensuring that the system returns to its initial state after each operation, enhancing flexibility and response speed. The third spring 9 abuts against the bushings 6 on the left and right sides respectively. When the key 200 is inserted into both the left lock cylinder 1 and the right lock cylinder 2 at the same time, the bushings 6 at both ends are pushed into the dial 3 under the pressure applied by the key 200, at which time the third spring 9 is compressed. In the keyless state, the third spring 9 pushes the bushings 6 on both sides outward with its elastic force, ensuring that the bushings 6 can be correctly reset. The third spring 9 ensures coordination when both sides unlock simultaneously, preventing one side from affecting the operation of the other, providing additional stability and balance, and enhancing the overall system reliability.

[0032] It is particularly important to emphasize that the addition of the third spring 9 is for emergency unlocking situations where the internal structure of one side of the lock cylinder is jammed during the unlocking process. In such cases, the elasticity of the first spring 7 or the second spring 8 is insufficient to forcefully push the jammed end of the bushing 6 out of the dial wheel 3. By adding the third spring 9, a greater elasticity is increased. Under the combined force of the first spring 7 or the second spring 8, the jammed end of the bushing 6 is forcibly pushed out of the dial wheel 3, causing the other bushing 6 to disengage from the dial wheel 3 and release the limiting cooperation of the circumferential limiting structure between the two. At this time, the circumferential limiting structure at the jammed end becomes ineffective, thereby achieving emergency unlocking.

[0033] As shown in Figures 1, 2, and 4, a limiting ring 31 is provided on the inner circumferential surface of the shift wheel 3, and bushings 6 are respectively disposed on both sides of the limiting ring 31. The limiting ring 31 is used to separate the bushings 6 on the left and right sides to avoid interference between them, thereby affecting the operation of the clutch transmission structure. At the same time, it provides a mounting point, a support point, and a space for movement for the left and right bushings 6, ensuring the stability and accuracy of the clutch transmission structure during operation. The first clutch shaft 4 and the second clutch shaft 5 are disposed at the axis of the limiting ring 31, ensuring the coaxiality between the first clutch shaft 4 and the second clutch shaft 5 and the shift wheel 3, so that they can maintain precise concentric movement during rotation, eliminating additional friction and wear caused by eccentricity, and improving transmission efficiency.

[0034] Specifically, referring to Figures 1, 2, and 4, the circumferential limiting structure includes a first limiting groove 311 formed on the limiting ring 31. A limiting protrusion 61 extends outward from the outer circumferential wall of the bushing 6, capable of inserting into and engaging with the first limiting groove 311. Through the engagement of the first limiting groove 311 and the limiting protrusion 61, the bushing 6 and the dial wheel 3 are circumferentially limited, allowing the bushing 6 to drive the dial wheel 3 to rotate and unlock. The left and right lock cylinders 1 and 2 are each provided with a second limiting groove 12, 22 that engages with the limiting protrusion 61. Through the engagement of the second limiting grooves 12, 22 and the limiting protrusion 61, the bushing 6 and the left and right lock cylinders 1 and 2 are circumferentially limited, allowing the key 200 to be inserted into the left and right lock cylinders 1 and rotated, thereby driving the bushing 6 and driving the dial wheel 3 to rotate and unlock. When the user inserts the key into the left lock cylinder 1 or the right lock cylinder 2, it drives the left lock cylinder 1 or the right lock cylinder 2 to move forward, causing the limiting protrusion 61 to engage with the second limiting groove 12, 22 for limiting engagement. Continuing forward, the limiting protrusion 61 then engages with the first limiting groove 311 for limiting engagement. Finally, turning the key 200 unlocks the lock. Under normal conditions, the limiting protrusion 61 is in a non-circumferential limiting engagement state with both the first limiting groove 311 and the second limiting groove 12, 22, i.e., in a disengaged state.

[0035] Further, referring to Figures 1, 2, and 4, three of each of the first limiting groove 311, limiting protrusion 61, and second limiting grooves 12, 22 are provided. In existing designs, the limiting fit typically involves two first limiting grooves 311 and two limiting grooves 12, 22 corresponding to two limiting protrusions 61. In this design, by adding a new first limiting groove 311, a new second limiting groove 12, 22, and a limiting protrusion 61, a foolproof mechanism is implemented, improving assembly efficiency and accuracy, facilitating installation and use, and effectively limiting and determining the rotation angle of the key 200 for unlocking, reducing the risk of operational errors.

[0036] As shown in Figures 1 and 4, the first clutch shaft 4 also includes a first shaft 42, and the second clutch shaft 5 also includes a second shaft 52. The first shaft 42 is hollow inside to allow the second shaft 52 to be movably fitted inside. The first shaft 42 and the second shaft 52 are riveted together to prevent them from separating. This structural design enables relative extension and retraction between the first clutch shaft 4 and the second clutch shaft 5, ensuring flexible response in different operating states (such as single-sided or double-sided unlocking). The riveted connection between the first shaft 42 and the second shaft 52 ensures that the two shafts will not accidentally separate during use, enhancing the overall integrity and reliability of the system, improving the overall stability and durability of the clutch transmission structure, and reducing the risk of wear due to long-term use. Simultaneously, it effectively works with the spring system (first spring 7, second spring 8, and third spring 9) to ensure that the system returns to its initial state after each operation, providing a reliable reset mechanism.

[0037] As shown in Figures 1 and 4, specifically, an annular blocking part 421 is provided at the end of the first shaft 42 away from its shaft discs 41 and 51. The annular blocking part 421 is recessed inward along the inner wall of the first shaft 42. An annular anti-detachment ramp 521 is provided at the end of the second shaft 52 away from its shaft discs 41 and 51. When the first shaft 42 and the second shaft 52 are stretched to their maximum length relative to each other, the annular anti-detachment ramp 521 abuts against the wall of the annular blocking part 421 to prevent the first shaft 42 and the second shaft 52 from separating. In specific implementation, a precise structural design is required so that the slope of the anti-detachment ramp 521 is slightly greater than that of the blocking part 421 to prevent them from separating. This structural design ensures that even under extreme conditions, the first shaft 42 and the second shaft 52 will not completely separate, preventing accidental separation due to excessive external force, thereby effectively maintaining the integrity, stability, and durability of the clutch transmission structure.

[0038] Furthermore, the left locking cylinder 1, right locking cylinder 2, dial wheel 3, first clutch shaft 4, second clutch shaft 5, and bushing 6 are all coaxially arranged. This ensures that each component maintains precise concentric movement during rotation, eliminating additional friction and wear caused by eccentricity, improving transmission efficiency, reducing energy loss, enhancing the system's mechanical precision, and minimizing operational errors caused by misalignment.

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

Claims

1. A double-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), both the left lock cylinder (1) and the right lock cylinder (2) having keyholes (11, 21) for inserting a key (200), and a dial (3) connecting the left lock cylinder (1) and the right lock cylinder (2), wherein the dial (3) is provided with a clutch transmission structure, characterized in that: The clutch transmission structure includes a first clutch shaft (4) and a second clutch shaft (5) coaxially riveted together and capable of relative telescopic movement. Both the first clutch shaft (4) and the second clutch shaft (5) are fitted with bushings (6). The first clutch shaft (4) and the second clutch shaft (5) have identical bearing discs (41, 51) that restrict the bushings (6) from disengaging. A first spring (7) is provided between the first clutch shaft (4) and the bushing (6) on the same side, and a second spring (8) is provided between the second clutch shaft (5) and the bushing (6) on the same side. A third spring (9) is provided between the bushings (6). One end of the bushings (6) on the left and right sides is respectively connected to the left lock cylinder (1) and the right lock cylinder (2) in a limiting engagement. The other end of the bushings (6) is respectively movably inserted into the dial wheel (3) through the circumferential limiting structure. When the key (200) is inserted into either the left lock cylinder (1) or the right lock cylinder (2), or both ends are inserted into the left lock cylinder (1) and the right lock cylinder (2) at the same time, the bushings (6) can reciprocate relative to the dial wheel (3). At this time, the dial wheel (3) can be driven to rotate through the circumferential limiting structure to unlock.

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 of the bushing (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 of the bushing (6) on the same side. The two ends of the third spring (9) abut against the bushings (6) on the left and right sides respectively.

3. A double-opening lock cylinder according to claim 1, characterized in that: The inner circumferential surface of the dial (3) is provided with a limiting ring (31), the bushing (6) is respectively provided on both sides of the limiting ring (31), and the first clutch shaft (4) and the second clutch shaft (5) are provided 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 includes a first limiting groove (311) opened on the limiting ring (31), and the outer circumferential wall of the bushing (6) is provided with a limiting protrusion (61) that can be inserted into the first limiting groove (311) and limited and cooperated with it. The left locking cylinder (1) and the right locking cylinder (2) are respectively provided with a second limiting groove (12, 22) that is limited and cooperated with the limiting protrusion (61).

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

6. A double-opening lock cylinder according to claim 1, characterized in that: The first clutch shaft (4) further includes a first shaft (42), and the second clutch shaft (5) further includes a second shaft (52). The first shaft (42) is hollow inside to allow the second shaft (52) to be movably fitted inside. The first shaft (42) and the second shaft (52) are riveted together by a riveting structure to prevent them from separating.

7. A double-opening lock cylinder according to claim 6, characterized in that: The first shaft (42) is provided with an annular blocking part (421) at one end away from its shaft disc (41, 51). The annular blocking part (421) is recessed inward along the inner wall of the first shaft (42). The second shaft (52) is provided with an annular anti-detachment ramp (521) at one end away from its shaft disc (41, 51). When the first shaft (42) and the second shaft (52) are stretched to their maximum length relative to each other, the annular anti-detachment ramp (521) abuts against the wall of the annular blocking part (421) to restrict 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 locking cylinder (1), right locking cylinder (2), dial (3), first clutch shaft (4), second clutch shaft (5) and bushing (6) are all coaxially arranged.

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