Anti-locking lock cylinder

Abstract

The anti-jamming lock cylinder comprises a lock shell, a lock container installed in the lock shell and a tail ruler assembly connected into the lock shell, a clutch assembly enabling the lock container to be separated from or combined with the tail ruler assembly is arranged between the lock container and the tail ruler assembly, and a key hole is formed in the lock container; when the key is not inserted into the key hole, the tail ruler assembly is separated from the clutch assembly and the lock cylinder; after the key is inserted into the key hole and gradually pushes the clutch assembly to enter the tail ruler assembly, the key is rotated, the lock container, the clutch assembly and the tail ruler assembly can coaxially and synchronously rotate, and the clutch assembly is in circumferential limiting fit with the lock container and the tail ruler assembly through a circumferential limiting structure. Due to the effect of the clutch assembly, the tail ruler assembly and the lock cylinder are in a separated state, even if foreign matter invades the key hole and blocks the key hole, the tail ruler assembly can still idle, motor burning or part damage caused by the foreign matter of a traditional lock cylinder is effectively avoided, and meanwhile the problem that indoor unlocking cannot be achieved due to the fact that a user forgets to pull out a key is solved.

Description

Technical Field

[0001] This utility model relates to the field of lock cylinders, specifically to a lock cylinder that prevents jamming. Background Technology

[0002] Currently, most smart lock cylinders on the market employ a dual-mode system combining mechanical and electric unlocking. Mechanical unlocking involves inserting a key into the lock cylinder, which rotates the cylinder and triggers the latch assembly, ultimately driving the bolt or latch to unlock. Electric unlocking uses a motor to drive the latch assembly, completing the unlocking action. The core components of both modes are the lock cylinder and the latch assembly; they must reliably connect during mechanical unlocking and operate independently during electric unlocking.

[0003] In traditional lock cylinders, when no key is inserted, the cylinder and tail gauge assembly may accidentally come into contact or become stuck due to structural gaps, foreign objects entering the keyhole, or other reasons, preventing the tail gauge assembly from rotating freely. For example, a foreign object inserted into the keyhole may push against the cylinder, causing circumferential interference between it and the tail gauge assembly. This can result in the tail gauge spinning freely or jamming during electric unlocking, and in severe cases, damage to the motor or rendering the lock cylinder unusable.

[0004] Secondly, when the key is inserted and drives the cylinder to rotate, the traditional structure relies on springs or friction to connect the cylinder and the tail gauge assembly, which is prone to slippage, free spin, or overload wear. For example, if the key is not fully inserted, the cylinder and the tail gauge assembly may partially engage, causing power transmission failure during rotation; after the key is removed, if the cylinder and the tail gauge assembly are not completely separated, residual resistance may cause a decrease in electric unlocking efficiency or jamming.

[0005] Therefore, there is a need for a lock cylinder that prevents jamming, enabling complete separation of the cylinder and tail gauge assembly under normal conditions, ensuring free rotation in electric mode, and precise synchronous linkage during mechanical unlocking to ensure reliable power transmission, while avoiding jamming or free rotation caused by foreign object interference or structural gaps. Utility Model Content

[0006] This invention overcomes the shortcomings of the above-mentioned technologies and provides a lock cylinder that prevents jamming.

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

[0008] A lock cylinder designed to prevent jamming includes a lock shell, a lock cylinder installed within the lock shell, and a tail gauge assembly connected within the lock shell. A clutch assembly is provided between the lock cylinder and the tail gauge assembly to allow them to separate or engage. The lock cylinder has a keyhole. When the key is not inserted into the keyhole, the tail gauge assembly, clutch assembly, and lock cylinder are separated. When the key is inserted into the keyhole and gradually pushes the clutch assembly into the tail gauge assembly, rotating the key causes the lock cylinder, clutch assembly, and tail gauge assembly to rotate coaxially and synchronously. The clutch assembly is circumferentially limited by a circumferential limiting structure that engages with the lock cylinder and tail gauge assembly.

[0009] Furthermore, the clutch assembly includes a bushing, a pin movably sleeved within the bushing and coaxially arranged with the bushing, and a spring disposed on the tail gauge assembly for driving the bushing and the pin to move axially toward the lock cylinder.

[0010] Furthermore, the bushing includes a first receiving cavity for accommodating the pin, the first receiving cavity having an annular inner ring, the annular inner ring having a through hole for the pin to pass through in the middle, the pin including a pin head and a pin rod, the pin head having a diameter larger than the pin rod and the diameter of the through hole, the pin rod having a diameter smaller than the diameter of the through hole, and the pin rod passing through the through hole.

[0011] Furthermore, the tail gauge assembly includes a tail gauge and a tail gauge connector connected to the tail gauge. The tail gauge connector is circumferentially limited to the tail gauge and drives the tail gauge to rotate coaxially. The end of the tail gauge connector facing the lock cylinder is provided with a second receiving cavity for accommodating the spring. The clutch assembly can move axially in the second receiving cavity.

[0012] Furthermore, the circumferential limiting structure includes a protrusion formed on the outer wall of the bushing and slots formed in the second receiving cavity and the lock cylinder respectively for the protrusion to be inserted and limited. The protrusion extends laterally on the side wall of the bushing.

[0013] Furthermore, the tail gauge connector has a slot on the side facing the tail gauge, the tail gauge is inserted into the slot and connected and fixed to the tail gauge connector through a connecting shaft, and the tail gauge has a connecting hole for the connecting shaft to pass through.

[0014] Furthermore, the lock cylinder includes two sets of blade grooves symmetrically opened on its side wall and blades inserted in the blade grooves. The blades can move in the blade grooves. The lock cylinder has a third receiving cavity for accommodating the clutch assembly on the side facing the clutch assembly. The clutch assembly can move axially in the third receiving cavity.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] The lock cylinder in this case incorporates a clutch assembly between the tail gauge assembly and the lock cylinder. Under normal conditions, the clutch assembly keeps the tail gauge assembly and the lock cylinder completely separated. Even if foreign objects enter and block the keyhole, the tail gauge assembly can still rotate freely, effectively preventing motor burnout or component damage caused by foreign objects in traditional lock cylinders. Similarly, if the key is not removed, the clutch assembly can automatically reset and separate the tail gauge assembly and the lock cylinder, ensuring uninterrupted electric unlocking and solving the problem of unlocking from indoors due to elderly people or children forgetting to remove their keys. When mechanically unlocking, a circumferential limiting structure ensures lossless power transmission, reducing errors in the rotation angle of the key and tail gauge, effectively ensuring that the lock cylinder, clutch assembly, and tail gauge assembly rotate coaxially and synchronously, making unlocking more convenient. Attached Figure Description

[0017] Figure 1 This is an exploded view of the lock cylinder in this case.

[0018] Figure 2 This is a schematic diagram of the clutch mechanism in this case.

[0019] Figure 3 This is one of the structural schematic diagrams of the tail gauge connector in this case.

[0020] Figure 4 This is the second structural schematic diagram of the tail gauge connector in this case.

[0021] Figure 5 This is a schematic diagram of the lock cylinder structure in this case. Detailed Implementation

[0022] The following examples provide a more detailed description of the features and other related characteristics of this utility model, to facilitate understanding by those skilled in the art:

[0023] like Figures 1 to 5As shown, this invention provides an anti-jamming lock cylinder, including a lock shell 1, a lock cylinder 2 installed inside the lock shell 1, and a tail gauge assembly 3 connected inside the lock shell 1. A clutch assembly 4 is provided between the lock cylinder 2 and the tail gauge assembly 3 to allow the lock cylinder 2 and the tail gauge assembly 3 to separate or engage. In specific implementation, the lock shell 1 is made of stainless steel or zinc alloy, forming a closed cavity, providing installation space and a support platform for the lock cylinder 2, the tail gauge assembly 3, and the clutch assembly 4. A keyhole 21 is provided on the lock cylinder 2; when the key 100 is not inserted into the keyhole 21, the tail gauge assembly 3 is separated from the clutch assembly 4 and the lock cylinder 2; when the key 100 is inserted into the keyhole 21 and gradually pushes the clutch assembly 4 into the tail gauge assembly 3, rotating the key 100 allows the lock cylinder 2, the clutch assembly 4, and the tail gauge assembly 3 to rotate coaxially and synchronously. The clutch assembly 4 is circumferentially limited and engaged with the lock cylinder 2 and the tail gauge assembly 3 through a circumferential limiting structure. This design incorporates a clutch assembly. Under normal conditions, when the key 100 is not inserted into the keyhole 21 of the cylinder 2, the cylinder 2 is completely separated from the tail gauge assembly 3. Even if foreign objects block the keyhole 21 or push against the cylinder 2, the tail gauge assembly 3 can still rotate freely because there is no circumferential connection between the cylinder 2 and the tail gauge assembly 3, avoiding jamming caused by foreign objects or motor idle running in traditional structures. The key 100 pushes the clutch assembly 4, rigidly connecting the cylinder 2, tail gauge assembly 3, and clutch assembly 4. When the key 100 is turned, power is transmitted through the circumferential limiting structure, avoiding the slippage problem of traditional friction clutches and ensuring the stability of mechanical unlocking. After the key 100 is removed, the clutch assembly 4 automatically resets, the cylinder 2 and tail gauge assembly 3 are separated again, and the electric unlocking mode immediately takes effect, resolving mode conflicts caused by the key 100 not being removed and improving ease of use. This solution constructs a dynamic protection mechanism through the design of the clutch assembly 4 and the circumferential limiting structure. The core lies in utilizing the axial sliding and circumferential limiting of the mechanical structure to achieve reliable switching between mechanical and electric modes. This avoids jamming caused by foreign object interference and ensures the accuracy of power transmission, adapting to the security needs of different scenarios and providing a solution for smart lock cylinders that balances reliability and ease of use.

[0024] Furthermore, such as Figure 1 , Figure 2As shown, the clutch assembly 4 includes a bushing 41, a pin 42 movably sleeved within the bushing 41 and coaxially arranged with the bushing 41, and a spring 43 disposed on the tail gauge assembly 3 for driving the bushing 41 and pin 42 to move axially toward the lock cylinder 2. In specific implementation, the bushing 41 is sleeved outside the pin 42, and the spring 43 abuts against the bushing 41 and the tail gauge assembly 3, forming a sliding connection between the bushing 41 and the pin 42. The axial movement of the bushing 41 and pin 42 relative to the tail gauge assembly 3 is achieved through the spring 43. The spring 43 provides a stable restoring force, ensuring that the clutch assembly 4 reliably separates the tail gauge assembly 3 and the lock cylinder 2 when the key 100 is not inserted, and that the tail gauge assembly 3 and the lock cylinder 2 are engaged when the key 100 is inserted, as the pushing force of the key 100 overcomes the spring force. The coaxial design of the bushing 41 and pin 42 reduces radial space occupation and is suitable for miniaturized lock cylinders.

[0025] Continue as Figure 1 , Figure 2 As shown, specifically, the bushing 41 includes a first receiving cavity 411 for accommodating the pin 42. The first receiving cavity 411 has an annular inner ring 412, and the annular inner ring 412 has a through hole 413 in the center for the pin 42 to pass through. The pin 42 includes a pin head 421 and a pin rod 422. The diameter of the pin head 421 is larger than the diameters of the pin rod 422 and the through hole 413, while the diameter of the pin rod 422 is smaller than the diameter of the through hole 413. The pin rod 422 passes through the through hole 413. In a specific implementation, the first receiving cavity 411 of the bushing 41 is divided into front and rear parts by the annular inner ring 412. The pin head 421 of the pin 42 extends and retracts in the front cavity, while the pin rod 422 can pass through the through hole 413 and movably reside in the rear cavity, forming a structure where the head of the pin head 421 is limited and the pin rod 422 slides smoothly. The pin head 421 limits the axial displacement range of the pin 42, ensuring that the head 421 is always in contact with the inner ring 412, and preventing the pin from completely disengaging from the bushing 41. The clearance fit between the pin rod 422 and the through hole 413 allows the pin 42 to smoothly transmit axial thrust, while preventing circumferential jamming.

[0026] Furthermore, such as Figures 1-4As shown, the tail gauge assembly 3 includes a tail gauge 31 and a tail gauge connector 32 connected to the tail gauge 31. The tail gauge connector 32 is circumferentially limited to the tail gauge 31 and drives the tail gauge 31 to rotate coaxially. The end of the tail gauge connector 32 facing the lock cylinder 2 has a second receiving cavity 321 for accommodating the spring 43. The clutch assembly 4 can move axially within the second receiving cavity 321. The tail gauge connector 32 and the tail gauge 31 are circumferentially limited, and the second receiving cavity 321 accommodates the spring 43 and the clutch assembly 4, forming a transmission chain between the connector 42 and the tail gauge. The tail gauge connector 42 acts as an intermediate transmission component between the tail gauge 31 and the clutch assembly 4, transmitting circumferential torque and providing installation space for the spring 43 and the clutch assembly 4. The second receiving cavity 321 facilitates the installation of the spring 43 and provides space for the bushing 41 to move axially. In specific implementations, the tail gauge 31 and the connector 32 can be detachably connected for easy maintenance and replacement, reducing maintenance costs.

[0027] Specifically, such as Figures 1-5 As shown, the circumferential limiting structure includes a protrusion 414 formed on the outer wall of the bushing 41 and slots 200 formed in the second receiving cavity 321 and the lock cylinder 2, respectively, for the protrusion 414 to be inserted and limited. The protrusion 414 extends laterally on the side wall of the bushing 41. In specific implementation, to make the circumferential limiting effect more stable and to effectively prevent foreign objects from being randomly inserted into the keyhole 21, which could lead to accidental connection between the lock cylinder 2 and the tail gauge assembly 3, and to play a foolproof role, in this case, preferably, two protrusions 414 are symmetrically arranged. Through the circumferential limiting structure, this case achieves synchronous and coaxial rotation of the lock cylinder 2, the tail gauge assembly 3, and the clutch assembly 4. When the protrusion 414 is not aligned with the slot 200 and is not accurately inserted, the three cannot move together, that is, the lock cannot be opened, thus achieving good anti-theft performance.

[0028] Furthermore, such as Figure 1 , Figure 3 , Figure 4 As shown, the tail ruler connector 32 has a slot 322 on the side facing the tail ruler 31. The tail ruler 31 is inserted into the slot 322 and connected and fixed to the tail ruler connector 32 via a connecting shaft 33. The tail ruler 31 has a connecting hole 311 through which the connecting shaft 33 passes. The tail ruler 31 is connected to the slot 322 on the tail ruler connector 32 via the connecting shaft 33, which effectively ensures the stability of the circumferential limit of the two, improves the transmission efficiency, enhances the unlocking efficiency, and avoids unlocking jamming caused by assembly errors. In specific implementation, the tail ruler 31, slot 322, and connecting shaft 33 achieve a detachable connection, facilitating the maintenance and replacement of components.

[0029] like Figure 1 , Figure 5As shown, the lock cylinder 2 includes two sets of blade grooves 22 symmetrically formed on its sidewalls and blades 23 inserted into the blade grooves 22. The blades 23 can move within the blade grooves 22. The lock cylinder 2 has a third receiving cavity 24 on the side facing the clutch assembly 4 for accommodating the clutch assembly 4. The clutch assembly 4 can move axially within the third receiving cavity 24. In specific implementation, to ensure the security of the lock cylinder and reduce the cost of manufacturing the lock cylinder, in this case, preferably, each set of blade grooves 22 contains four blade grooves 22, and each blade groove 22 is in which a blade 23 is inserted. Of course, users can also set more or fewer blade grooves 22 and blades 24 according to specific needs, as long as the same function and effect can be achieved. The setting of the third receiving cavity 24 facilitates the axial movement of the clutch assembly 4, that is, the bushing 41 and the pin 42, providing space for their axial movement. In practice, the slot 200 on the lock cylinder 2 is opened in the third receiving cavity 24. The circumferential torque of the lock cylinder 2 is transmitted through the slot 200 on the lock cylinder 2 and the protrusion 414 on the bushing 41.

[0030] The working principle of this case is described below in conjunction with the full text:

[0031] 1. Under normal conditions, that is, when the key 100 is not inserted, the bushing 41 of the clutch assembly 4 is held at its rear limit position between the lock cylinder 2 and the tail gauge assembly 3 under the thrust of the spring 43. At this time, the protrusion 414 on the outer wall of the bushing 41 is completely disengaged from the slot 200 of the tail gauge connector 32 and the slot of the third receiving cavity 24 of the lock cylinder 2, and the second receiving cavity 321 of the tail gauge connector 32 of the tail gauge assembly 3 maintains an axial clearance with the front end of the bushing 41. Because the key is not inserted, the internal blade 23 of the lock cylinder 2 is not lifted, and the lock cylinder 2 cannot rotate; the tail gauge assembly 3 is in a free-rotating state and has no circumferential or axial contact with the lock cylinder 2.

[0032] When the user triggers the electric unlocking through the intelligent system, the motor drives the tail gauge assembly 3 to rotate. The tail gauge 31 directly drives the lever or lock tongue through the connecting shaft 33 and the tail gauge connector 32. At this time, the clutch assembly 4 is kept separated by the force of the spring 43 and does not participate in the transmission, ensuring that the electric mode operates independently.

[0033] If a foreign object is inserted into the keyhole 21, it may push the lock cylinder 2 to rotate freely. However, due to the force of the spring 43, under normal circumstances, the bushing 41 is not connected to the lock cylinder 2 or the tail gauge assembly 3. The rotation of the lock cylinder 2 cannot be transmitted to the tail gauge assembly 3, thus avoiding motor stalling or component damage caused by foreign object jamming.

[0034] 2. When the user inserts key 100 to mechanically unlock the lock, key 100 is gradually pushed into keyhole 21 until it finally contacts the head 421 of pin 42 of clutch assembly 4, pushing pin 42 to move axially along through hole 413 of bushing 41. Since the diameter of pin head 421 is larger than through hole 413, the movement of pin drives bushing 41 to move forward synchronously, compressing spring 43 in second receiving cavity 321 of tail gauge connector 32. When bushing 41 moves forward to its limit position, the protrusion 414 on its outer wall is fully inserted into the slot 200 of second receiving cavity 321 of tail gauge connector 32 and the slot 200 of third receiving cavity 24 of lock cylinder 2, forming a rigid connection between one protrusion 414 and two slots 200. At this time, tail gauge connector 32 is circumferentially locked to bushing 41 through protrusion 414, realizing coaxial and synchronous rotation of lock cylinder 2, tail gauge assembly 3, and clutch assembly 4.

[0035] When the user turns the key, the lock cylinder 2 releases its rotation restriction because the internal blades 23 are pushed to the same height by the key teeth. The lock cylinder transmits torque to the bushing 41 through the engagement of its third receiving cavity 24 slot 200 and the bushing protrusion 414. The bushing 41 drives the tail ruler connector 32 to rotate through the protrusion 414. The tail ruler connector 32 then drives the tail ruler 31 to rotate synchronously through the slot 322 and the connecting shaft 33. Finally, the tail ruler 31 drives the latch or lock tongue to complete the unlocking action.

[0036] After key 100 is removed, spring 43 releases its stored elastic potential energy, pushing bushing 41 to move axially backward. Protrusion 414 disengages from the slot 200 of tail gauge connector 32 and lock cylinder 2. Pin head 421 returns to its initial position against the inner annular ring 412 of bushing 41. At this point, lock cylinder 2 and tail gauge assembly 3 are separated, and the system re-enters the electric unlocking ready mode.

[0037] As stated above, this case protects a lock cylinder that prevents jamming, and 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 lock cylinder designed to prevent jamming, characterized in that: The lock includes a lock shell (1), a lock cylinder (2) installed inside the lock shell (1), and a tail gauge assembly (3) connected inside the lock shell (1). A clutch assembly (4) is provided between the lock cylinder (2) and the tail gauge assembly (3) to allow the lock cylinder (2) and the tail gauge assembly (3) to separate or engage. A keyhole (21) is provided on the lock cylinder (2). When the key (100) is not inserted into the keyhole (21), the tail gauge assembly (3), the clutch assembly (4), and the lock cylinder (2) are separated. When the key (100) is inserted into the keyhole (21) and gradually pushes the clutch assembly (4) into the tail gauge assembly (3), rotating the key (100) can make the lock cylinder (2), the clutch assembly (4), and the tail gauge assembly (3) coaxial and rotate synchronously. The clutch assembly (4) is circumferentially limited and engaged with the lock cylinder (2) and the tail gauge assembly (3) through a circumferential limiting structure.

2. The anti-jamming lock cylinder according to claim 1, characterized in that: The clutch assembly (4) includes a bushing (41), a pin (42) movably sleeved inside the bushing (41) and coaxially arranged with the bushing (41), and a spring (43) arranged on the tail gauge assembly (3) for driving the bushing (41) and the pin (42) to move axially toward the lock cylinder (2).

3. The anti-jamming lock cylinder according to claim 2, characterized in that: The bushing (41) includes a first receiving cavity (411) for accommodating the pin (42). The first receiving cavity (411) is provided with an annular inner ring (412). The annular inner ring (412) is provided with a through hole (413) in the middle for the pin (42) to pass through. The pin (42) includes a pin head (421) and a pin rod (422). The diameter of the pin head (421) is larger than the diameter of the pin rod (422) and the through hole (413). The diameter of the pin rod (422) is smaller than the diameter of the through hole (413). The pin rod (422) passes through the through hole (413).

4. The anti-jamming lock cylinder according to claim 3, characterized in that: The tail gauge assembly (3) includes a tail gauge (31) and a tail gauge connector (32) connected to the tail gauge (31). The tail gauge connector (32) is circumferentially limited to the tail gauge (31) and drives the tail gauge (31) to rotate coaxially. The tail gauge connector (32) has a second receiving cavity (321) for accommodating the spring (43) at one end facing the lock cylinder (2). The clutch assembly (4) can move axially in the second receiving cavity (321).

5. A lock cylinder for preventing jamming according to claim 4, characterized in that: The circumferential limiting structure includes a protrusion (414) on the outer side wall of the bushing (41) and a slot (200) in the second receiving cavity (321) and the lock cylinder (2) respectively for the protrusion (414) to be inserted and limited. The protrusion (414) extends laterally on the side wall of the bushing (41).

6. A lock cylinder for preventing jamming according to claim 5, characterized in that: The tail ruler connector (32) has a slot (322) on the side facing the tail ruler (31). The tail ruler (31) is inserted into the slot (322) and connected and fixed to the tail ruler connector (32) through the connecting shaft (33). The tail ruler (31) has a connecting hole (311) for the connecting shaft (33) to pass through.

7. The anti-jamming lock cylinder according to claim 1, characterized in that: The lock cylinder (2) includes two sets of blade grooves (22) symmetrically opened on its side wall and blades (23) inserted in the blade grooves (22). The blades (23) can move in the blade grooves (22). The lock cylinder (2) has a third receiving cavity (24) for accommodating the clutch assembly (4) on the side facing the clutch assembly (4). The clutch assembly (4) can move axially in the third receiving cavity (24).

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