Double-opening lock

Abstract

Unlocking of a first lock cylinder triggers connection of a first transmission sleeve and a dial wheel assembly, so that the first lock cylinder drives the dial wheel assembly to rotate through the first transmission sleeve, and a linkage rod responds to the connection action of the first transmission sleeve and the dial wheel assembly to move towards a second lock cylinder and drives a second transmission sleeve to be separated from the dial wheel assembly; unlocking of the second lock cylinder triggers joint of the second transmission sleeve and the shifting wheel assembly, the second lock cylinder drives the shifting wheel assembly to rotate through the second transmission sleeve, and the linkage rod responds to joint action of the second transmission sleeve and the shifting wheel assembly to move towards the first lock cylinder and drive the first transmission sleeve to be separated from the shifting wheel assembly. The anti-theft lock has the advantages of being simple in structure and optimizing the anti-theft function.

Description

Technical Field

[0001] This utility model relates to a lock, and more particularly to a double-opening lock. Background Technology

[0002] Early door locks generally used an "outer key + inner knob" opening method, meaning the key was used to unlock the door from the outside, and the inner knob was used to quickly open the door from the inside. However, this design had obvious flaws: if the inner knob was damaged or the deadbolt mechanism was jammed, people inside might not be able to open the door, and criminals could use tools such as hooks to operate the inner knob through the door gap, posing a certain security risk.

[0003] To address the aforementioned issues, double-key locks have emerged on the market. These locks utilize two independent lock cylinders within the lock body, allowing for unlocking from both the inside and outside with keys. For example, prior art publication CN102587727A mentions "a double-key pin tumbler lock," which features a symmetrical lock cylinder structure within the lock case, allowing independent operation of the keys on both sides without interference. However, while this symmetrical design achieves bidirectional unlocking, it still has shortcomings: 1. The two independent lock cylinder structures are cumbersome, increasing manufacturing costs; 2. The internal unlocking structure of pin tumbler locks is relatively simple; thieves can unlock them simply by aligning the pins with a hook or similar tool and rotating the lock cylinder, resulting in weak anti-theft functionality. Therefore, while the aforementioned double-key pin tumbler lock addresses the shortcomings of previous locks, significant room for improvement remains. Utility Model Content

[0004] The purpose of this invention is to provide a double-opening lock that solves at least one of the above-mentioned problems, achieving a simple structure and optimized anti-theft function.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a double-lock device, comprising a first lock body, a second lock body, and a dial assembly located between the two. The first lock body includes a first lock cylinder that can be rotated after unlocking, and the second lock body includes a second lock cylinder that can be rotated after unlocking. The double-lock device also includes a transmission structure located between the first lock body and the second lock body. The transmission structure includes: a first transmission sleeve disposed between the first lock cylinder and the dial assembly, which engages or disengages from the dial assembly through axial displacement; and a second transmission sleeve disposed between the second lock cylinder and the dial assembly, which engages or disengages from the dial assembly through axial displacement. The component includes a linkage rod that axially passes through the dial assembly and can move bidirectionally along the axis. Unlocking the first lock cylinder triggers the engagement of the first transmission sleeve with the dial assembly, causing the first lock cylinder to rotate the dial assembly via the first transmission sleeve. The linkage rod responds to the engagement of the first transmission sleeve with the dial assembly by moving towards the second lock cylinder, driving the second transmission sleeve to disengage from the dial assembly. Similarly, unlocking the second lock cylinder triggers the engagement of the second transmission sleeve with the dial assembly, causing the second lock cylinder to rotate the dial assembly via the second transmission sleeve. The linkage rod responds to the engagement of the second transmission sleeve with the dial assembly by moving towards the first lock cylinder, driving the first transmission sleeve to disengage from the dial assembly.

[0006] After adopting the above technical solution, the present invention has the following advantages: a transmission structure is provided between the first lock body and the second lock body. The transmission structure includes: a first transmission sleeve, a second transmission sleeve and a linkage rod. The linkage rod axially passes through the dial assembly and moves bidirectionally along the axis to respond to the actions of the first transmission sleeve and the second transmission sleeve.

[0007] The first lock body can be unlocked by rotating the first lock cylinder. The first transmission sleeve is located between the first lock cylinder and the dial assembly. When the first lock body is in the unlocked state, it triggers the engagement of the first transmission sleeve and the dial assembly. The linkage rod responds to the engagement action of the first transmission sleeve and the dial assembly and moves towards the second lock cylinder. At this time, the linkage rod drives the second transmission sleeve to disengage from the dial assembly. Then, the rotation of the first lock cylinder drives the dial assembly to rotate through the first transmission sleeve, thereby unlocking the first lock body. At this time, since the second transmission sleeve is disengaged from the dial assembly, the second lock body cannot be unlocked.

[0008] The second lock body can be unlocked by rotating the second lock cylinder. The second transmission sleeve is located between the second lock cylinder and the dial assembly. When the second lock body is in the unlocked state, it triggers the engagement of the second transmission sleeve and the dial assembly. The linkage rod responds to the engagement action of the second transmission sleeve and the dial assembly and moves towards the first lock cylinder. At this time, the linkage rod drives the first transmission sleeve to disengage from the dial assembly. Then, the rotation of the second lock cylinder drives the dial assembly to rotate through the second transmission sleeve, thereby unlocking the second lock body. At this time, because the first transmission sleeve is disengaged from the dial assembly, the first lock body cannot be unlocked.

[0009] As can be seen from the above, it has the following advantages:

[0010] 1. The first lock body and the second lock body are linked together by a linkage rod. Compared with the independent unlocking structure of two separate lock cylinders, by sharing the dial assembly and linkage rod, the number of parts is reduced while maintaining the double-opening function, making the internal structure of the double-opening lock simpler and more compact, and reducing the production cost.

[0011] 2. By moving the linkage rod in both directions to respond to the actions of the first and second transmission sleeves, the entire double-lock device forms a forced mechanical interlock. When the lock cylinder on either side is in the unlocked state, the linkage rod will physically block the unlocking transmission path on the other side, ensuring that the first and second lock cylinders cannot be unlocked at the same time. This dynamic linkage has higher security compared to the independent double-lock device structure that can be unlocked at the same time.

[0012] 3. Engagement of the first or second transmission sleeve with the dial assembly can only be established through a proper key operation. As described above, common technical unlocking tools such as hooks cannot replace a proper key to trigger the engagement or disengagement of the first or second transmission sleeve with the linkage rod, nor can they use the first or second transmission sleeve to rotate the dial assembly for unlocking. Therefore, this effectively resists common technical unlocking methods, improving the security of double-lock systems and making them more reliable.

[0013] Furthermore, the engagement of the first transmission sleeve and the dial assembly constitutes a plug-in connection that restricts their relative rotation while allowing them to move axially relative to each other.

[0014] Furthermore, one of the first transmission sleeve and the dial assembly has an eccentrically arranged first transmission pin, and the other has an eccentrically arranged first transmission groove. The first transmission pin and the first transmission groove are inserted into or separated from each other as the first transmission sleeve is axially displaced; or, one of the first transmission sleeve and the dial assembly has a coaxial first transmission post, and the other has a coaxial first transmission hole. The first transmission post and the first transmission hole constitute an insertion connection that restricts their relative rotation and allows their axial relative movement.

[0015] Furthermore, the engagement of the second transmission sleeve with the dial assembly constitutes a plug-in connection that restricts their relative rotation while allowing them to move axially relative to each other.

[0016] Furthermore, one of the second transmission sleeve and the dial assembly has an eccentrically arranged second transmission pin, and the other has an eccentrically arranged second transmission groove. The second transmission pin and the second transmission groove are inserted into or separated from each other as the second transmission sleeve is axially displaced; or, one of the second transmission sleeve and the dial assembly has a coaxial second transmission post, and the other has a coaxial second transmission hole. The second transmission post and the second transmission hole constitute an insertion connection that restricts their relative rotation and allows their relative axial movement.

[0017] In summary, the engagement of the first transmission sleeve, the second transmission sleeve, and the dial assembly constitutes a plug-in structure that restricts their relative rotation while allowing their axial relative movement. This plug-in structure locks the relative rotation between the first transmission sleeve, the second transmission sleeve, and the dial assembly through a physical limiting structure. This rigid connection prevents slippage or misalignment of torque during transmission.

[0018] Furthermore, a pre-tightened first transmission spring is provided between the first transmission sleeve and the first lock cylinder to maintain the engagement tendency of the first transmission sleeve and the dial assembly; a pre-tightened second transmission spring is provided between the second transmission sleeve and the second lock cylinder to maintain the engagement tendency of the second transmission sleeve and the dial assembly.

[0019] Furthermore, the dial assembly is equipped with an anti-explosion pin, the linkage rod is equipped with a first anti-explosion groove, and a pre-tightened first anti-explosion spring is provided between the end of the linkage rod near the first transmission sleeve and the first transmission sleeve. When the second lock cylinder is removed, the first transmission spring pushes the first transmission sleeve to engage the dial assembly, and the first anti-explosion spring pushes the linkage rod to move towards the second lock cylinder, so that the anti-explosion pin is inserted into the first anti-explosion groove to axially lock the linkage rod; and / or, the linkage rod is equipped with a second anti-explosion groove, and a pre-tightened second anti-explosion spring is provided between the end of the linkage rod near the second transmission sleeve and the second transmission sleeve. When the first lock cylinder is removed, the second transmission spring pushes the second transmission sleeve to engage the dial assembly, and the second anti-explosion spring pushes the linkage rod to move towards the second lock cylinder, so that the anti-explosion pin is inserted into the second anti-explosion groove to axially lock the linkage rod.

[0020] Using the aforementioned technical solution, when the second lock cylinder is removed, the first transmission spring drives the first transmission sleeve to move towards the second lock cylinder to maintain engagement with the dial assembly. Simultaneously, the first explosion-proof spring drives the linkage rod to move towards the second lock cylinder until the explosion-proof pin engages with the first explosion-proof groove. This process achieves dual locking.

[0021] 1. Axial locking: The axial movement of the linkage rod is restricted by the insertion of the anti-explosion pin into the first anti-explosion groove;

[0022] 2. Circumferential locking: The linkage rod cannot move axially, so the first transmission sleeve cannot disengage from the dial assembly to allow the dial assembly to rotate.

[0023] In summary, the insertion connection between the first transmission sleeve and the dial assembly always restricts their rotation, so the dial assembly cannot be rotated to unlock.

[0024] Alternatively, after the first lock cylinder is removed, the second transmission spring drives the second transmission sleeve to move towards the first lock cylinder to maintain engagement with the dial assembly. At the same time, the second explosion-proof spring drives the linkage rod to move towards the first lock cylinder until the explosion-proof pin engages with the second explosion-proof groove. This process achieves double locking.

[0025] 1. Axial locking: The axial movement of the linkage rod is restricted by the insertion of the anti-explosion pin and the second anti-explosion groove;

[0026] 2. Circumferential locking: The linkage rod cannot move axially, so the second transmission sleeve cannot disengage from the dial assembly to allow the dial assembly to rotate.

[0027] In summary, the insertion connection between the second transmission sleeve and the dial assembly always restricts their rotation, so the dial assembly cannot be rotated to unlock.

[0028] This integrated mechanical structure protection method avoids forced unlocking. Although the structure is simple, it significantly improves the security of the lock and makes it more reliable to use.

[0029] Furthermore, the first explosion-proof groove is an annular groove arranged along the circumference of the linkage rod; and / or, the second explosion-proof groove is an annular groove arranged along the circumference of the linkage rod.

[0030] By adopting the aforementioned technical solution, the circumferential continuity of the annular groove ensures that the linkage rod is at any angle in the circumferential direction, and the anti-explosion pin can be inserted without deliberate alignment, thus avoiding the failure of anti-explosion due to insertion deviation; and / or, the circumferential continuity of the annular groove ensures that the linkage rod is at any angle in the circumferential direction, and the anti-explosion pin can be inserted without deliberate alignment, thus avoiding the failure of anti-explosion due to insertion deviation.

[0031] Furthermore, the anti-explosion pin is configured to be driven by its own gravity to insert into the first or second anti-explosion slot; or, the dial assembly is provided with an elastic element that biases the anti-explosion pin toward the linkage rod.

[0032] Using the aforementioned technical solution, the anti-riot pin is located on the dial assembly. Since the radial height of the dial assembly is limited, in order to ensure that the length of the anti-riot pin is sufficient to be inserted into the first anti-riot groove and to play a role in axial positioning, the anti-riot pin can be set to fall into the first or second anti-riot groove by its own weight; or, a method of biasing the anti-riot pin through an elastic element can be adopted. This biasing through the elastic element can absorb part of the mechanical impact, reduce the wear between the anti-riot pin and the dial assembly, and when the linkage rod moves to the point where the anti-riot pin is inserted into the first or second anti-riot groove, the elastic preload of the elastic element ensures that the anti-riot pin forms a stable contact with the first or second anti-riot groove and remains in a locked state.

[0033] Furthermore, the dial assembly includes an inner dial having at least one tapered end.

[0034] Using the aforementioned technical solution, when a force-picking tool (such as a wrench or crowbar) clamps the outer circumference of the inner dial, the tapered end changes the contact surface of the force-picking tool from a flat surface to an inclined surface. Therefore, when the force-picking tool applies force, it will have a relative sliding tendency with the contact surface of the inner dial, making it impossible for the force-picking tool to stably engage the surface of the inner dial, thereby reducing the torque transmission capability and increasing the security of the double-lock device.

[0035] Furthermore, the double-lock device includes a first lock shell located outside the first lock cylinder, a second lock shell located outside the second lock cylinder, and a dial lock shell located outside the dial assembly. The first lock shell, the second lock shell, and the dial lock shell are integrally formed. The first lock shell and the dial lock shell are connected by a first tapered section; and / or, the second lock shell and the dial lock shell are connected by a second tapered section. The cross-sections of the first tapered section and the second tapered section are smaller than the cross-sections of the first lock shell, the second lock shell, and the dial lock shell.

[0036] Using the aforementioned technical solution, the cross-section of the first tapered section is smaller than the cross-sections of the first lock housing and the dial housing. The first tapered section is used to reduce the cross-sectional area at the connection point, thereby reducing the connection strength between the first lock housing and the dial assembly. Therefore, when an external force is applied to the first lock housing, the first tapered section will break due to insufficient strength, and the first lock housing will separate from the dial housing, keeping the dial housing intact. The dial assembly still requires the correct key to rotate and unlock. Alternatively, the cross-section of the second tapered section is smaller than the cross-sections of the second lock housing and the dial housing. The second tapered section is used to reduce the cross-sectional area at the connection point, thereby reducing the connection strength between the second lock housing and the dial assembly. Therefore, when an external force is applied to the second lock housing, the second tapered section will break due to insufficient strength, and the second lock housing will separate from the dial housing, keeping the dial housing intact. The dial assembly still requires the correct key to rotate and unlock. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings:

[0038] Figure 1 This is a schematic diagram of the structure of a double-opening lock without the key inserted according to this utility model. Figure 1 ;

[0039] Figure 2 This is a schematic diagram of the structure of a double-opening lock for inserting a key according to this utility model. Figure 1 ;

[0040] Figure 3 This is a schematic diagram of the structure of a double-opening lock without the key inserted according to this utility model. Figure 2 ;

[0041] Figure 4 This is a schematic diagram of the structure of a double-opening lock for inserting a key according to this utility model. Figure 2 ;

[0042] Figure 5 This is a schematic diagram of the structure of a double-opening lock without the key inserted according to this utility model. Figure 3 ;

[0043] Figure 6 This is a schematic diagram of the structure of a double-opening lock for inserting a key according to this utility model. Figure 3 ;

[0044] Figure 7 This is a schematic diagram of the engagement of the first transmission sleeve, the second transmission sleeve, and the connecting piece of this utility model without the key inserted.

[0045] Figure 8 This is a schematic diagram showing the engagement of the first transmission sleeve, the second transmission sleeve, and the connecting piece with the key inserted in this utility model.

[0046] Figure 9 This is a cross-sectional view of the first transmission sleeve, the second transmission sleeve, and the connecting piece of this utility model without the key inserted.

[0047] Figure 10 This is a cross-sectional schematic diagram of the first transmission sleeve, the second transmission sleeve, and the connecting piece of this utility model, showing the insertion of a key.

[0048] Figure 11 This is a schematic diagram of the structure of this utility model without the key inserted. Figure 1 ;

[0049] Figure 12 A schematic diagram of the key insertion structure in an embodiment of this utility model. Figure 1 ;

[0050] Figure 13 This is a schematic diagram of the structure of this utility model without the key inserted. Figure 2 ;

[0051] Figure 14 A schematic diagram of the key insertion structure in an embodiment of this utility model. Figure 2 ;

[0052] Figure 15 This is a schematic diagram of the engagement of the first transmission sleeve, the second transmission sleeve, and the connecting member without the key inserted in an embodiment of the present utility model.

[0053] Figure 16 This is a schematic diagram showing the engagement of the first transmission sleeve, the second transmission sleeve, and the connecting piece with the key inserted in an embodiment of the present utility model.

[0054] Figure 17 This is a cross-sectional view of the first transmission sleeve, the second transmission sleeve, and the connecting piece in an embodiment of the present utility model without the key inserted;

[0055] Figure 18 This is a cross-sectional schematic diagram of the first transmission sleeve, the second transmission sleeve, and the connecting piece inserted into the key in an embodiment of this utility model;

[0056] Figure 19 This is a cross-sectional schematic diagram of the first transmission sleeve and connecting member of this utility model;

[0057] Figure 20 This is a cross-sectional schematic diagram of the first transmission sleeve and the connecting member in an embodiment of the present invention.

[0058] Figure 21 This is a schematic diagram of the anti-riot mechanism of the first lock body in this utility model;

[0059] Figure 22 This is a cross-sectional schematic diagram of the anti-riot mechanism of the first lock body in this utility model;

[0060] Figure 23 This utility model Figure 1 Enlarged view of point A in the image;

[0061] Figure 24 This is a schematic diagram of the structure of the first lock housing, the second lock housing, and the dial lock housing in this utility model. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0063] The terms "first," "second," etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this utility model, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.

[0064] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0065] like Figures 1 to 10 As shown, this utility model provides a double-lock device, including a first lock body 100, a second lock body 200, and a dial assembly 300 located between the two. The first lock body 100 includes a first lock cylinder 110 that can be rotated after unlocking, and the second lock body 200 includes a second lock cylinder 210 that can be rotated after unlocking. The double-lock device also includes a transmission structure located between the first lock body 100 and the second lock body 200. The transmission structure includes: a first transmission sleeve 1 disposed between the first lock cylinder 110 and the dial assembly 300, which engages or disengages from the dial assembly 300 by axial displacement; a second transmission sleeve 2 disposed between the second lock cylinder 210 and the dial assembly 300, which engages or disengages from the dial assembly 300 by axial displacement; and a linkage rod 3, whose axial displacement... The first lock cylinder 110, which runs through the dial assembly 300 and can move bidirectionally along the axis, triggers the engagement of the first transmission sleeve 1 with the dial assembly 300 when the first lock cylinder 110 is unlocked. This causes the first lock cylinder 110 to drive the dial assembly 300 to rotate via the first transmission sleeve 1. The linkage rod 3, in response to the engagement of the first transmission sleeve 1 with the dial assembly 300, moves toward the second lock cylinder 210, driving the second transmission sleeve 2 to disengage from the dial assembly 300. Similarly, the second lock cylinder 210, which triggers the engagement of the second transmission sleeve 2 with the dial assembly 300, causes the second lock cylinder 210 to drive the dial assembly 300 to rotate via the second transmission sleeve 2. The linkage rod 3, in response to the engagement of the second transmission sleeve 2 with the dial assembly 300, moves toward the first lock cylinder 110, driving the first transmission sleeve 1 to disengage from the dial assembly 300.

[0066] It is understood that a transmission structure is provided between the first lock body 100 and the second lock body 200. The transmission structure includes: a first transmission sleeve 1, a second transmission sleeve 2 and a linkage rod 3. The linkage rod 3 axially passes through the dial assembly 300 and moves bidirectionally along the axis to respond to the actions of the first transmission sleeve 1 and the second transmission sleeve 2.

[0067] The bidirectional movement of the aforementioned linkage 3 refers to moving towards the first lock cylinder 110 or towards the second lock cylinder 210.

[0068] It should be noted that such double-lock devices are generally installed on doors, so the two sides of the double-lock device correspond to the indoor and outdoor areas respectively. In this embodiment, for ease of explanation, the side of the first lock body 100 corresponds to the outdoor area, and the side of the second lock body 200 corresponds to the indoor area.

[0069] like Figure 1 , Figure 3 and Figure 5As shown, in the state where no key is inserted, the double-lock device in this embodiment has an axisymmetric structure, including the tumbler structure of the first lock body 100 and the second lock body 200, which is also a symmetrical structure. That is to say, the first lock body 100 and the second lock body 200 of the double-lock device can be unlocked with the same key. The purpose of this design is to facilitate installation and reduce the steps of distinguishing between the inside and outside during installation.

[0070] However, in other embodiments, in order to further consider the security of the double-lock, the pin tumbler structure can also adopt an asymmetrical structure, but the structure other than the pin tumbler structure still adopts a symmetrical structure. That is to say, the first lock body 100 and the second lock body 200 need to be matched with two different keys respectively.

[0071] like Figure 2 , Figure 4 and Figure 6 As shown, the following are the unlocking methods for the first lock cylinder 110 and the second lock cylinder 210:

[0072] 1. The first lock body 100 can be unlocked by rotating the first lock cylinder 110.

[0073] The first transmission sleeve 1 is located between the first lock cylinder 110 and the dial assembly 300. When the key is inserted into the first lock body 100 and is in the unlocked state, the tail of the key pushes the first abutment part 11 of the first transmission sleeve 1, triggering the engagement of the first transmission sleeve 1 with the dial assembly 300. The linkage rod 3 responds to the engagement action of the first transmission sleeve 1 with the dial assembly 300 and moves towards the second lock cylinder 210. At this time, the linkage rod 3 drives the second transmission sleeve 2 to disengage from the dial assembly 300. Then, the key is turned to drive the first lock cylinder 110 to rotate, which in turn drives the dial assembly 300 to rotate through the first transmission sleeve 1, thereby unlocking the first lock body 100. At this time, since the second transmission sleeve 2 is disengaged from the dial assembly 300, the second lock body 200 cannot be unlocked.

[0074] 2. The second lock body 200 can be unlocked by rotating the second lock cylinder 210.

[0075] The second transmission sleeve 2 is located between the second lock cylinder 210 and the dial assembly 300. When the key is inserted into the second lock body 200 and is in the unlocked state, the tail of the key pushes the second abutment part 21 of the second transmission sleeve 2, triggering the engagement of the second transmission sleeve 2 with the dial assembly 300. The linkage rod 3 responds to the engagement action of the second transmission sleeve 2 with the dial assembly 300 and moves towards the first lock cylinder 110. At this time, the linkage rod 3 drives the first transmission sleeve 1 to disengage from the dial assembly 300. Then, the key is turned to drive the second lock cylinder 210 to rotate, which in turn drives the dial assembly 300 to rotate through the second transmission sleeve 2, thereby unlocking the second lock body 200. At this time, since the first transmission sleeve 1 is disengaged from the dial assembly 300, the first lock body 100 cannot be unlocked.

[0076] As can be seen from the above, this unlocking method has the following advantages:

[0077] 1. The first lock body 100 and the second lock body 200 are linked together by the linkage rod 3. Compared with the independent unlocking structure of two independent lock cylinders, by sharing the dial assembly 300 and the linkage rod 3, the number of parts is reduced while maintaining the double-opening function, making the internal structure of the double-opening lock simpler and more compact, and reducing the production cost.

[0078] 2. By moving the linkage rod 3 in both directions to respond to the actions of the first transmission sleeve 1 and the second transmission sleeve 2, the entire double-lock device forms a forced mechanical interlock. When the lock cylinder on either side is in the unlocked state, the linkage rod 3 will physically block the unlocking transmission path on the other side, making it impossible to insert the key. The first lock cylinder and the second lock cylinder alternately control the dial assembly, ensuring that only one lock cylinder can drive the dial assembly to unlock at a time. This ensures that the first lock cylinder 110 and the second lock cylinder 210 cannot unlock at the same time. This dynamic linkage provides higher security compared to the independent double-lock device structure that can unlock at the same time.

[0079] It should be noted that the above-mentioned unlocked state refers to unlocking with a legitimate key.

[0080] Specifically, when the double-lock device in this embodiment is used for home security, a key can be inserted from inside the house. At this time, thieves located outside the house cannot unlock the first lock cylinder with a regular key, nor can they unlock the first lock cylinder with conventional technical unlocking methods, thus ensuring the safety of people inside the house.

[0081] 3. Engagement between the first transmission sleeve 1 or the second transmission sleeve 2 and the dial assembly 300 can only be established through a proper key operation. As described above, common technical unlocking tools such as hooks cannot replace a proper key to trigger the engagement or disengagement of the first transmission sleeve 1 or the second transmission sleeve 2 with the linkage rod 3. Furthermore, the first transmission sleeve 1 or the second transmission sleeve 2 cannot drive the dial assembly 300 to rotate and unlock the lock. Therefore, this effectively resists common technical unlocking methods, improving the security of the double-lock mechanism and making it more reliable.

[0082] It should be mentioned that the first transmission sleeve 1 has a first limiting hole 12, and the first lock core 110 has a first limiting shaft 111 that cooperates with the first limiting hole 12. The first limiting shaft 111 extends into the first limiting hole 12 to limit the axial displacement of the first transmission sleeve 1.

[0083] Similarly, the second transmission sleeve 2 has a second limiting hole 22, and the second lock core 210 has a second limiting shaft 211 that cooperates with the second limiting hole 22. The second limiting shaft 211 extends into the second limiting hole 22 to limit the axial displacement of the second transmission sleeve 2.

[0084] Specifically, a pre-tightened first transmission spring 120 is provided between the first transmission sleeve 1 and the first lock core 110 to maintain the engagement tendency of the first transmission sleeve 1 and the dial assembly 300; a pre-tightened second transmission spring 220 is provided between the second transmission sleeve 2 and the second lock core 210 to maintain the engagement tendency of the second transmission sleeve 2 and the dial assembly 300.

[0085] The first transmission spring 120 and the second transmission spring 220 ensure that the first transmission sleeve 1 and the second transmission sleeve 2 are engaged with the dial assembly 300 when no key is inserted on either side, thus achieving balance.

[0086] It should be explained that when no keys are inserted on either side, both the first transmission sleeve 1 and the second transmission sleeve 2 remain engaged with the dial assembly 300. Taking the first lock body 100 as an example: only when a key is inserted into the first lock body 100 will the second transmission sleeve 2 be disengaged from the dial assembly 300 via the linkage rod 3. The same applies to the second lock body 200. This is done to prevent unlocking by technical means and improve security.

[0087] In this embodiment, an anti-riot mechanism is also provided. The anti-riot process of the first anti-riot mechanism is as follows: an anti-riot pin 320 is provided on the dial assembly 300, and a first anti-riot groove 31 is provided on the linkage rod 3. A pre-tightened first anti-riot spring 33 is provided between the end of the linkage rod 3 near the first transmission sleeve 1 and the first transmission sleeve 1. When the second lock core 210 is removed, the first transmission spring 120 pushes the first transmission sleeve 1 to engage the dial assembly 300, and the first anti-riot spring 33 pushes the linkage rod 3 to move towards the second lock core 210, so that the anti-riot pin 320 is inserted into the first anti-riot groove 31 to axially lock the linkage rod.

[0088] In other words, when the second lock cylinder 210 is removed, the first transmission spring 120 drives the first transmission sleeve 1 to move towards the second lock cylinder 210 to maintain engagement with the dial assembly 300. At the same time, the first explosion-proof spring drives the linkage rod 3 to move towards the second lock cylinder 210 until the explosion-proof pin 320 is inserted into the first explosion-proof groove 31. This process achieves double locking.

[0089] 1. Axial locking: The axial movement of the linkage rod 3 is restricted by the insertion of the anti-explosion pin 320 into the first anti-explosion groove 31;

[0090] 2. Circumferential locking: The linkage rod 3 cannot move axially, so the first transmission sleeve 1 cannot disengage from the dial assembly 300 to allow the dial assembly 300 to rotate.

[0091] In summary, the insertion connection between the first transmission sleeve 1 and the dial assembly 300 always restricts their rotation, so the dial assembly 300 cannot be rotated to unlock.

[0092] like Figure 21 and 22 As shown, the anti-riot process of the second anti-riot mechanism is as follows: The linkage rod 3 is provided with a second anti-riot groove 32, the dial assembly 300 is provided with an anti-riot pin 320, and a pre-tightened second anti-riot spring 34 is provided between the end of the linkage rod 3 near the second transmission sleeve 2 and the second transmission sleeve 2. When the first lock core 110 is removed, the second transmission spring 220 pushes the second transmission sleeve 2 to engage the dial assembly 300, and the second anti-riot spring 34 pushes the linkage rod 3 to move towards the second lock core 210, so that the anti-riot pin 320 is inserted into the second anti-riot groove 32 to axially lock the linkage rod 3.

[0093] Similarly, when the first lock cylinder 110 is removed, the second transmission spring 220 drives the second transmission sleeve 2 to move toward the first lock cylinder 110 to maintain engagement with the dial assembly 300. At the same time, the second explosion-proof spring drives the linkage rod 3 to move toward the first lock cylinder 110 until the explosion-proof pin 320 is inserted into the second explosion-proof groove 32.

[0094] This process also achieves double locking:

[0095] 1. Axial locking: The axial movement of the linkage rod 3 is restricted by the insertion of the anti-explosion pin 320 into the second anti-explosion groove 32;

[0096] 2. Circumferential locking: The linkage rod 3 cannot move axially, so the second transmission sleeve 2 cannot disengage from the dial assembly 300 to allow the dial assembly 300 to rotate.

[0097] In summary, the plug-in connection between the second transmission sleeve 2 and the dial assembly 300 always restricts their rotation, so the dial assembly 300 cannot be rotated to unlock.

[0098] Ideally, both the first anti-riot groove 31 and the second anti-riot groove 32 are annular grooves arranged along the circumference of the linkage rod 3.

[0099] The circumferential continuity of the annular groove ensures that the linkage rod 3 can be at any angle in the circumferential direction, and the anti-explosion pin 320 can be inserted without deliberate alignment, thus avoiding the failure of anti-explosion due to insertion deviation.

[0100] Furthermore, in this embodiment, the optimal feature is that the dial assembly 300 is provided with an elastic element, which biases the anti-explosion pin 320 against the linkage rod 3. Specifically, the elastic element is a spring, and there are two anti-explosion pins 320.

[0101] In order to enable the anti-riot pin 320 to withstand greater force after being inserted into the first anti-riot groove 31 or the second anti-riot groove 32, the anti-riot pin 320 is set relative to each other, that is, the installation angle between the two anti-riot pins 320 is 180°, so as to make the structure more stable.

[0102] Furthermore, in other embodiments, the anti-explosion pin 320 can also be driven to insert into the first anti-explosion groove 31 by its own gravity. In this case, the length of the anti-explosion pin 320 needs to be greater than the depth of the first anti-explosion groove 31 in order to restrict the axial movement of the linkage rod 3.

[0103] Similarly, the anti-riot pin 320 can also be inserted into the second anti-riot groove 32 by relying on its own gravity. In this case, the length of the anti-riot pin 320 needs to be greater than the depth of the second anti-riot groove 32 in order to restrict the axial movement of the linkage rod 3.

[0104] This is because the anti-riot pin 320 is located on the dial assembly 300. Since the radial height of the dial assembly 300 is limited, in order to ensure that the length of the anti-riot pin 320 is sufficient to be inserted into the first anti-riot groove 31 and to play a role in axial positioning, it is preferable to use an anti-riot pin 320 biased by an elastic element. This biasing by the elastic element can absorb some mechanical impact, reduce wear between the anti-riot pin 320 and the dial assembly 300, and when the linkage rod 3 moves to the point where the anti-riot pin 320 is inserted into the first anti-riot groove 31 or the second anti-riot groove 32, the elastic preload of the elastic element ensures that the anti-riot pin 320 forms a stable contact with the first anti-riot groove 31 or the second anti-riot groove, and remains locked.

[0105] This integrated mechanical structure protection method avoids unlocking the lock by force. Although the structure is simple, it significantly improves the security of the lock and makes it more reliable to use.

[0106] It should be noted that the first transmission spring 120 drives the first transmission sleeve 1 to move towards the direction of the second lock core 210, thereby ensuring that the first transmission sleeve 1 always remains engaged with the dial assembly 300. To ensure that the linkage rod 3 receives sufficient power to move towards the second lock core 210 so that the anti-riot pin 320 engages with the first anti-riot groove 31, a pre-tensioned first anti-riot spring 33 is added between the end of the linkage rod 3 near the first transmission sleeve 1 and the first transmission sleeve 1. The elastic thrust generated by the first anti-riot spring 33 provides sufficient driving force for the linkage rod 3, making the anti-riot mechanism more reliable and stable.

[0107] Similarly, the second lock body 200 is operated by a second transmission spring 220 that drives the second transmission sleeve 2 to move toward the direction of the first lock cylinder 110, thereby ensuring that the second transmission sleeve 2 remains engaged with the dial assembly 300. To ensure that the linkage rod 3 receives sufficient power to move toward the first lock cylinder 110 so that the anti-riot pin 320 engages with the second anti-riot groove 32, a pre-tensioned second anti-riot spring 34 is added between the end of the linkage rod 3 near the second transmission sleeve 2 and the second transmission sleeve 2. The elastic thrust generated by the second anti-riot spring 34 provides sufficient driving force to the linkage rod 3, making the anti-riot mechanism more reliable and stable.

[0108] Furthermore, the first explosion-proof spring not only provides sufficient driving force for the linkage rod 3, but also enables the first transmission sleeve 1, the second transmission sleeve 2, and the linkage rod 3 to form a flexible connection through the spring itself. This flexible connection not only reduces the mechanical buffering of the linkage rod 3 placed between the first transmission sleeve 1 and the second transmission sleeve 2 and absorbs the impact generated by the joint to reduce wear, but also compensates for tolerances. Specifically, during the production of double-opening locks, the axial fit clearance between the linkage rod 3 and the first transmission sleeve 1 and the second transmission sleeve 2 may become stuck due to processing errors. The first explosion-proof spring 33 and the second explosion-proof spring 34 ensure that the flexible connection between the linkage rod 3 and the first transmission sleeve 1 and the second transmission sleeve 2 always maintains a minimum clearance. The elastic deformation of the first explosion-proof spring 33 and the second explosion-proof spring 34 absorbs the cumulative tolerances generated during production, ensuring smooth operation of the transmission structure.

[0109] It can be seen that the transmission structure in this technical solution not only simplifies the internal structure of the double-opening lock and has the advantages brought by the transmission structure itself, but also achieves the anti-riot function by combining the anti-riot pin 320 with the first anti-riot groove 31 and the second anti-riot groove 32 on the linkage rod 3, achieving two goals at once.

[0110] In this embodiment, the first lock body 100 has the first anti-riot mechanism described above, and the second lock body 200 also has the second anti-riot mechanism described above. Therefore, this embodiment proposes a double-opening lock with anti-riot function on both sides, which is suitable for banks and scenarios with high security requirements.

[0111] In practical use, it is also possible to choose that only the first lock body 100 has the first anti-riot mechanism; or, only the second lock body 200 has the second anti-riot mechanism. These two usage options are suitable for household entrance doors and are mainly used to prevent theft.

[0112] Alternatively, anti-riot devices may not be used, which is suitable for scenarios where a high level of safety is not required.

[0113] The applicable scenarios mentioned above are only for the purpose of facilitating the understanding of the technical solutions and are not limited to the scope of application mentioned above.

[0114] like Figure 22 As shown, the dial assembly 300 includes an unlocking dial 330, an inner dial 340, and a connector 350. The unlocking dial 330 is sleeved on the outer periphery of the inner dial 340, and the inner dial 340 is sleeved on the outer periphery of the connector 350. The unlocking dial 330, the inner dial 340, and the connector 350 are fixedly connected by a fixing pin 310, and the linkage rod 3 is located inside the connector 350.

[0115] It should be noted that the first transmission sleeve 1 and the second transmission sleeve 2 are engaged with the connecting member 350.

[0116] like Figure 23 As shown, the inner dial 340 has at least one tapered end, which forms a tapered structure 341.

[0117] This tapered structure 341 causes the contact surface of a brute-force lock-picking tool (such as a wrench or crowbar) to change from a flat surface to an inclined surface when it clamps the outer circumference of the inner dial 340. Therefore, when the brute-force lock-picking tool applies force, it tends to slide relative to the contact surface of the inner dial 340, preventing the tool from stably engaging the surface of the inner dial 340. This reduces torque transmission capability and increases the security of the double-lock device.

[0118] The tapered structure 341 mentioned above is specifically set as a tapered conical surface in this embodiment, or it can also be a tapered trapezoid, etc.

[0119] Specifically, such as Figure 24 As shown, in this embodiment, the double-lock device also includes a first lock shell 112 disposed outside the first lock cylinder 110, a second lock shell 212 disposed outside the second lock cylinder 210, and a dial lock shell 311 disposed outside the dial assembly 300. The first lock shell 112, the second lock shell 212 and the dial lock shell 311 are integrally formed. The first lock shell 112 and the dial lock shell 311 are connected by a first reduced diameter section 312. The cross-section of the first reduced diameter section 312 is smaller than the cross-section of the first lock shell 112 and the dial lock shell 311.

[0120] The cross-section of the first tapered section 312 is smaller than the cross-sections of the first lock housing 110 and the dial lock housing 311. The first tapered section 312 is used to reduce the cross-sectional area at the connection and reduce the connection strength between the first lock housing 110 and the dial lock housing 311. Therefore, when an external force is applied to the first lock housing 110, the first tapered section 312 will break due to insufficient strength, and the first lock housing 112 will separate from the dial lock housing 311, so that the dial housing 311 remains intact, and the dial assembly 300 still requires the correct key to rotate and unlock.

[0121] The second lock housing 212 and the dial lock housing 311 are connected by a second tapered section 213, the cross-section of which is smaller than the cross-section of the second lock housing 212 and the dial lock housing 311.

[0122] The cross-section of the second reduced diameter section 213 is smaller than the cross-section of the second lock housing 212 and the dial lock housing 311. The second reduced diameter section 213 is used to reduce the cross-sectional area at the connection and reduce the connection strength between the second lock housing 212 and the dial lock housing 311. Therefore, when an external force is applied to the second lock housing 212, the second reduced diameter section 213 will break due to insufficient strength, and the second lock housing 212 will separate from the dial lock housing 311, so that the dial housing 311 remains intact, and the dial assembly 300 still requires the correct key to rotate and unlock.

[0123] In this embodiment, a first reduced diameter section 312 and a second reduced diameter section 213 can be simultaneously provided in a double-opening lock that requires anti-riot protection on both sides.

[0124] In other embodiments, if only one side needs to be protected against explosions, for example, if only the outdoor side needs to be protected against explosions, then only the first diameter reduction section 312 needs to be set.

[0125] Furthermore, the two ends of the dial lock housing 311 have tapered slopes 311a. These tapered slopes 311a cause the contact surface of the lock-picking tool (such as a wrench or crowbar) to change from a flat surface to a slope when it clamps the outer circumference of the dial lock housing 311. Therefore, when the lock-picking tool applies force, it tends to slide relative to the contact surface of the dial lock housing 311, making it impossible for the lock-picking tool to stably engage the surface of the dial lock housing 311. This reduces the torque transmission capability and increases the security of the double-lock device.

[0126] The engagement of the first transmission sleeve 1, the second transmission sleeve 2, and the dial assembly 300 constitutes a plug-in connection that restricts their relative rotation but allows their axial relative movement.

[0127] In this preferred embodiment, such as Figures 7 to 10 , Figure 19 As shown, the first transmission sleeve 1 has an eccentrically set first transmission pin 13, and the dial assembly 300 has an eccentrically set first transmission groove 360. The first transmission pin 13 and the first transmission groove 360 ​​are inserted into or separated from each other as the first transmission sleeve 1 is axially displaced. According to the above, the first transmission pin 13 will only separate from the first transmission groove 360 ​​when the second lock cylinder 210 is in the unlocked state.

[0128] In other embodiments, the first transmission sleeve 1 may have an eccentrically arranged first transmission groove 360, and the dial assembly 300 may have a first transmission pin 13.

[0129] Specifically, there are two first transmission pins 13, so there are also two first transmission grooves 360 to cooperate with them. In order to enable the two first transmission pins 13 to withstand greater torque after being inserted into the first transmission grooves 360, the two first transmission pins 13 are arranged opposite each other. That is to say, the installation angle between the two first transmission pins 13 is 180°, which makes the structure more stable.

[0130] In other embodiments, such as Figures 11 to 18 , Figure 20 As shown, the first transmission sleeve 1 is provided with a first transmission hole 14, and the dial assembly 300 is provided with a first transmission post 370. The first transmission hole 14 and the first transmission post 370 are coaxially arranged.

[0131] Alternatively, the first transmission sleeve 1 is provided with a first transmission post 370, and the dial assembly 300 is provided with a first transmission hole 14, with the first transmission post 370 and the first transmission hole 14 being coaxially arranged.

[0132] Specifically, the outer peripheral surface of the first transmission column 370 has a first transmission surface 371, the inner surface of the first transmission hole 14 has a second transmission surface 141, the first transmission column 370 is inserted into the first transmission hole 14, and the first transmission surface 371 and the second transmission surface 141 form a complementary structure for transmitting torque.

[0133] In layman's terms, it only requires the first transmission column 370 to be matched with the non-circular structure of the first transmission hole 14.

[0134] Regardless of the specific mating method described above, the goal is to create a plug-in connection between the first transmission post 370 and the first transmission hole 14 that restricts their relative rotation while allowing them to move axially relative to each other.

[0135] In this preferred embodiment, the second transmission sleeve 2 has an eccentrically arranged second transmission pin 23, and the dial assembly 300 has an eccentrically arranged second transmission groove 380. The second transmission pin 23 and the second transmission groove 380 are inserted into or separated from each other as the second transmission sleeve 2 is axially displaced. As can be seen from the above, the second transmission pin 23 will only separate from the second transmission groove 380 when the first lock cylinder 110 is in the unlocked state.

[0136] In other embodiments, the second transmission sleeve 2 may have an eccentrically arranged second transmission groove 380, and the dial assembly 300 may have a second transmission pin 23.

[0137] Specifically, there are two second transmission pins 23, so there are also two second transmission grooves 380 to cooperate with them. In order to allow the two second transmission pins 23 to withstand greater torque after being inserted into the second transmission grooves 380, the two first transmission pins 13 are arranged opposite each other. That is to say, the installation angle between the two second transmission pins 23 is 180°, which makes the structure more stable.

[0138] In other embodiments, the second transmission sleeve 2 is provided with a second transmission hole 24, and the dial assembly 300 is provided with a second transmission column 390, with the second transmission hole 24 and the second transmission column 390 being coaxially arranged.

[0139] Alternatively, the second transmission sleeve 2 is provided with a second transmission column 390, and the dial assembly 300 is provided with a second transmission hole 24, with the second transmission column 390 and the second transmission hole 24 being coaxially arranged.

[0140] Specifically, the outer peripheral surface of the second transmission column 390 has a third transmission surface 391, and the inner surface of the second transmission hole 24 has a fourth transmission surface 241. The second transmission column 390 is inserted into the first transmission hole 14, and the third transmission surface 391 and the fourth transmission surface 241 form a complementary structure for transmitting torque.

[0141] In layman's terms, it only requires the first transmission column 370 to be matched with the non-circular structure of the first transmission hole 14.

[0142] Regardless of the specific mating method described above, the goal is to create a plug-in connection between the second transmission post 390 and the second transmission hole 24 that restricts their relative rotation while allowing them to move axially relative to each other.

[0143] In this preferred embodiment, the first transmission sleeve 1 has an eccentrically set first transmission pin 13, and the dial assembly 300 has an eccentrically set first transmission groove 360; the second transmission sleeve 2 has an eccentrically set second transmission pin 23, and the dial assembly 300 has an eccentrically set second transmission groove 380.

[0144] In other embodiments, a first transmission sleeve 1 may be provided with a first transmission hole 14, and a dial assembly 300 may be provided with a first transmission post 370, with the first transmission hole 14 and the first transmission post 370 being coaxially arranged; a second transmission sleeve 2 may be provided with a second transmission hole 24, and a dial assembly 300 may be provided with a second transmission post 390, with the second transmission hole 24 and the second transmission post 390 being coaxially arranged.

[0145] Alternatively, one combination can be selected, and one example is given here: the first transmission sleeve 1 has an eccentrically set first transmission pin 13, and the dial assembly 300 has an eccentrically set first transmission groove 360; the second transmission sleeve 2 is provided with a second transmission hole 24, and the dial assembly 300 is provided with a second transmission column 390, and the second transmission hole 24 and the second transmission column 390 are coaxially set.

[0146] The above are merely illustrative examples, and not all will be listed here. Any combination of the above-mentioned forms, or any technical means that achieves the purpose of limiting the relative rotation of the two while allowing the relative axial movement of the two, falls within the scope of protection.

[0147] In summary, the engagement of the first transmission sleeve 1, the second transmission sleeve 2, and the dial assembly 300 constitutes a plug-in structure that restricts their relative rotation while allowing their axial relative movement. This plug-in structure locks the relative rotation between the first transmission sleeve 1, the second transmission sleeve 2, and the dial assembly 300 through a physical limiting structure. This rigid connection avoids slippage or misalignment of torque during transmission.

[0148] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A double-lock device, comprising a first lock body, a second lock body, and a dial assembly located between the two, wherein the first lock body includes a first lock cylinder rotatable after unlocking, and the second lock body includes a second lock cylinder rotatable after unlocking, characterized in that, The double-lock mechanism also includes a transmission structure located between the first lock body and the second lock body. The transmission structure includes: a first transmission sleeve disposed between the first lock cylinder and the dial assembly, which engages or disengages from the dial assembly via axial displacement; a second transmission sleeve disposed between the second lock cylinder and the dial assembly, which engages or disengages from the dial assembly via axial displacement; and a linkage rod that axially passes through the dial assembly and can move bidirectionally along its axis. Unlocking the first lock cylinder triggers the engagement of the first transmission sleeve with the dial assembly, causing the first lock cylinder to rotate the dial assembly via the first transmission sleeve. The linkage rod responds to the engagement of the first transmission sleeve with the dial assembly by moving towards the second lock cylinder, driving the second transmission sleeve to disengage from the dial assembly. Similarly, unlocking the second lock cylinder triggers the engagement of the second transmission sleeve with the dial assembly, causing the second lock cylinder to rotate the dial assembly via the second transmission sleeve. The linkage rod responds to the engagement of the second transmission sleeve with the dial assembly by moving towards the first lock cylinder, driving the first transmission sleeve to disengage from the dial assembly.

2. A double locking device according to claim 1, wherein The engagement of the first transmission sleeve and the dial assembly constitutes a plug-in connection that restricts their relative rotation but allows them to move axially relative to each other.

3. A double deadbolt according to claim 2, wherein, One of the first transmission sleeve and the dial assembly has an eccentrically arranged first transmission pin, and the other has an eccentrically arranged first transmission groove. The first transmission pin and the first transmission groove are inserted into or separated from each other as the first transmission sleeve is axially displaced; or, one of the first transmission sleeve and the dial assembly has a coaxial first transmission post, and the other has a coaxial first transmission hole. The first transmission post and the first transmission hole form an insertion connection that restricts their relative rotation and allows their relative axial movement.

4. The double deadbolt of claim 1 wherein, The engagement of the second transmission sleeve and the dial assembly constitutes a plug-in connection that restricts their relative rotation but allows them to move axially relative to each other.

5. A double deadbolt according to claim 4, wherein, One of the second transmission sleeve and the dial assembly has an eccentrically arranged second transmission pin, and the other has an eccentrically arranged second transmission groove. The second transmission pin and the second transmission groove are inserted into or separated from each other as the second transmission sleeve is axially displaced; or, one of the second transmission sleeve and the dial assembly has a coaxially arranged second transmission post, and the other has a coaxially arranged second transmission hole. The second transmission post and the second transmission hole form an insertion connection that restricts their relative rotation and allows their relative axial movement.

6. The double deadbolt of claim 1 wherein, A pre-tightened first transmission spring is provided between the first transmission sleeve and the first lock cylinder to maintain the engagement tendency of the first transmission sleeve and the dial assembly; a pre-tightened second transmission spring is provided between the second transmission sleeve and the second lock cylinder to maintain the engagement tendency of the second transmission sleeve and the dial assembly.

7. A double deadbolt according to claim 6 wherein, The dial assembly is equipped with an anti-explosion pin, and the linkage rod is equipped with a first anti-explosion groove. A pre-tightened first anti-explosion spring is provided between the end of the linkage rod near the first transmission sleeve and the first transmission sleeve. When the second lock cylinder is removed, the first transmission spring pushes the first transmission sleeve to engage the dial assembly, and the first anti-explosion spring pushes the linkage rod to move towards the second lock cylinder, so that the anti-explosion pin is inserted into the first anti-explosion groove to axially lock the linkage rod; and / or, the linkage rod is equipped with a second anti-explosion groove, and a pre-tightened second anti-explosion spring is provided between the end of the linkage rod near the second transmission sleeve and the second transmission sleeve. When the first lock cylinder is removed, the second transmission spring pushes the second transmission sleeve to engage the dial assembly, and the second anti-explosion spring pushes the linkage rod to move towards the second lock cylinder, so that the anti-explosion pin is inserted into the second anti-explosion groove to axially lock the linkage rod.

8. A double deadbolt according to claim 7, wherein, The first explosion-proof groove is an annular groove arranged along the circumference of the linkage rod; and / or, the second explosion-proof groove is an annular groove arranged along the circumference of the linkage rod.

9. A double deadbolt according to claim 7, wherein, The anti-explosion pin is configured to be driven by its own gravity to insert into the first anti-explosion slot or the second anti-explosion slot; or, the dial assembly is provided with an elastic element that biases the anti-explosion pin toward the linkage rod.

10. The double deadbolt according to claim 1, wherein, The dial assembly includes an inner dial with at least one tapered end.

11. The double deadbolt according to claim 1, wherein, The lock includes a first lock shell located outside a first lock cylinder, a second lock shell located outside a second lock cylinder, and a dial lock shell located outside a dial assembly. The first lock shell, the second lock shell, and the dial lock shell are integrally formed. The first lock shell and the dial lock shell are connected by a first reduced-diameter section, the cross-section of which is smaller than the cross-section of the first lock shell and the dial lock shell; and / or, the second lock shell and the dial lock shell are connected by a second reduced-diameter section, the cross-section of which is smaller than the cross-section of the second lock shell and the dial lock shell.

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