A type of lock cylinder

Abstract

This utility model discloses a lock cylinder, which includes a lock cylinder housing. An annular mounting protrusion is formed on the inner surface of the lock cylinder housing. A mounting groove is formed in the center of the mounting protrusion, through which a handle knob is connected. A reset torsion spring is fitted on the outer side of the mounting protrusion, and a guide plate is fitted on the outer side of the handle knob, positioned above the reset torsion spring. An annular engaging groove is recessed on the outer side of the handle knob, into which a fixing clamp is fitted. The fixing clamp presses and fixes the guide plate to the outer side of the handle knob. The assembly is compact, enabling multiple functions such as rotation control, angle limiting, and automatic reset. This effectively improves the operational stability and return reliability of the lock cylinder during opening and closing, precisely limiting the rotation angle to prevent misoperation and mechanical damage. The linkage between the toggle block and the torsion spring arm ensures a smooth and efficient reset process, and the washer component provides excellent buffering and friction reduction.

Description

Technical Field

[0001] This utility model belongs to the field of lock structure technology, and specifically relates to a lock cylinder. Background Technology

[0002] With increasing security demands, lock structures are constantly being optimized and upgraded. The lock cylinder, as a core component, directly affects the overall stability and security of the lock. Existing lock cylinder structures mostly employ a rotary opening and closing mechanism, relying primarily on internal actuating components to rotate the cylinder and achieve unlocking or locking. However, traditional lock cylinders suffer from several drawbacks: 1) a lack of effective limiting structures; 2) a lack of automatic reset functions; 3) loose assembly and weak connections; and 4) a lack of buffering and wear-reducing structures. The rotary structure of traditional lock cylinders is often based on rigid contact, which is prone to wear after prolonged use, leading to problems such as loose knobs and jamming, affecting service life and security performance. Utility Model Content

[0003] In view of the technical problems mentioned in the background art, the purpose of this utility model is to provide a lock cylinder to solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a lock cylinder comprising a lock cylinder housing, an annular mounting protrusion protruding from the inner surface of the lock cylinder housing, a mounting groove formed in the middle of the mounting protrusion, a handle knob connected in the mounting groove, a return torsion spring sleeved on the outer side of the mounting protrusion, a guide plate sleeved on the outer side of the handle knob, the guide plate being positioned above the return torsion spring, and an annular engaging groove recessed on the outer side of the handle knob, a fixing clamp sleeved in the engaging groove, the fixing clamp pressing and fixing the guide plate to the outer side of the handle knob.

[0005] Furthermore, the outer sides of the handle knob are symmetrically recessed with limiting grooves, and the inner sides of the guide plate are respectively provided with limiting blocks. The limiting blocks cooperate with the limiting grooves to limit the connection.

[0006] Furthermore, the size of the limiting slot is larger than the size of the limiting block.

[0007] Furthermore, the guide plate has a toggle block at its front end, a first toggle spring arm on one side of the reset toggle spring, a second toggle spring arm on the other side of the reset toggle spring, and the toggle block is disposed between the first toggle spring arm and the second toggle spring arm.

[0008] Furthermore, a washer is fitted between the handle knob and the mounting ring.

[0009] Furthermore, the top of the washer component is provided with a first annular washer protrusion, and the bottom of the washer component is provided with a second annular washer protrusion. The first washer protrusion and the second washer protrusion are concentrically arranged, and the first washer protrusion and the second washer protrusion abut against the upper end and the lower end of the mounting protrusion, respectively, to form a clamping positioning.

[0010] Furthermore, the upper end of the handle knob is provided with a handle connecting rod, which is a square rod.

[0011] The present invention has the following advantages: The inner surface of the lock cylinder housing has a circular mounting protrusion. A mounting groove is formed in the middle of the mounting protrusion, through which a handle knob is connected. A reset torsion spring is fitted on the outer side of the mounting protrusion, and a guide plate is fitted on the outer side of the handle knob, positioned above the reset torsion spring. A circular engaging groove is recessed on the outer side of the handle knob, in which a fixing clamp is fitted. The fixing clamp presses the guide plate tightly and securely fixes it to the outer side of the handle knob. A washer is fitted between the handle knob and the mounting protrusion. The lock cylinder assembly of this invention is compact and can achieve multiple functions such as rotation control, angle limiting, and automatic reset. Through the cooperation between the mounting protrusion and the handle knob inside the lock cylinder housing, combined with the reset torsion spring, guide plate, fixing clamp, washer, and other structures, the operational stability and return reliability of the lock cylinder during opening and closing are effectively improved. Meanwhile, the combination of the limit block and the limit slot structure can accurately limit the rotation angle and prevent misoperation and damage to the mechanism; while the linkage between the toggle block and the torsion spring arm makes the reset process smooth and efficient, and the setting of the washer component provides a good buffer and friction reduction function. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model.

[0014] Reference numerals: Lock cylinder housing 10; Mounting protrusion ring 11; Mounting through groove 12; Handle knob 20; Reset torsion spring 30; Guide plate 40; Engaging groove 21; Fixing clamp 50; Limiting groove 22; Limiting block 41; Actuating block 42; First torsion spring arm 31; Second torsion spring arm 32; Washer component 60; First washer protrusion ring 61; Second washer protrusion ring 62; Handle connecting rod 23. Detailed Implementation

[0015] like Figures 1 to 2As shown, a lock cylinder includes a lock cylinder housing 10. An annular mounting protrusion 11 protrudes from the inner surface of the lock cylinder housing 10, defining the axial position of internal components and providing a mounting reference. A mounting groove 12 is formed in the center of the mounting protrusion 11, through which a handle knob 20 is connected. The handle knob 20 is inserted into the groove via its axial component, enabling linkage operation with the inner cylinder. A return torsion spring 30 is fitted on the outer side of the mounting protrusion 11, automatically resetting the inner cylinder to the initial locked position after the key or handle is released, thus achieving an automatic reset function. A guide plate 40 is fitted on the outer side of the handle knob 20, positioned above the return torsion spring 30, guiding the rotation direction and limiting the rotation angle. To secure the guide plate 40, a circular engaging groove 21 is recessed on the outer side of the handle knob 20. A fixing clamp 50 is fitted into the engaging groove 21, pressing the guide plate 40 firmly and fixing it securely to the outside of the handle knob 20, preventing it from loosening or shifting during use. In use, the user rotates the handle knob 20 to drive the inner core, which in turn drives the actuating mechanism inside the lock cylinder to complete the locking or unlocking action. After releasing the key, the handle knob 20 and the inner core automatically return to their original positions under the elastic force of the return torsion spring 30. The presence of the guide plate 40 limits the rotation angle of the knob, preventing excessive rotation from damaging the mechanism; simultaneously, the clamping structure of the fixing clamp 50 enhances the stability and service life of the overall connection.

[0016] In practical implementation, the handle knob 20 has symmetrically recessed limiting grooves 22 on both outer sides. These limiting grooves 22 are used to cooperate with the limiting structure on the guide plate 40 to achieve limiting control of the rotation angle. The guide plate 40 has correspondingly protruding limiting blocks 41 on both inner sides. These limiting blocks 41 cooperate with the limiting grooves 22 to form a limiting mechanism. Specifically, the size of the limiting groove 22 is slightly larger than the size of the limiting block 41, facilitating the smooth insertion of the limiting block 41 while maintaining sufficient engagement stability to prevent rotational slippage. During assembly, the limiting blocks 41 on both sides are inserted into their corresponding limiting grooves 22 to achieve a relative snap-fit ​​limiting connection, making the guide plate 40 more stable during movement.

[0017] In practical implementation, the guide plate 40 has a toggle block 42 at its front end. The toggle block 42 is an integral protruding structure used to cooperate with the reset torsion spring 30 to transmit torsional force. The reset torsion spring 30 has a first torsion spring arm 31 on one side and a second torsion spring arm 32 on the other side, which can undergo elastic deformation and store energy during the rotation of the handle knob 20. The toggle block 42 is located between the first torsion spring arm 31 and the second torsion spring arm 32. In use, when the user rotates the handle knob 20 and drives the guide plate 40 to rotate, the toggle block 41 rotates accordingly and pushes the first torsion spring arm 31 or the second torsion spring arm 32 on both sides to undergo torsional deformation, thereby allowing the reset torsion spring 30 to store energy. When the rotation ends and the user releases the handle knob, the reset torsion spring 30, under the action of elastic restoring force, drives the toggle block 41 to rotate in the opposite direction, thereby pushing the guide plate 40 and the handle knob 20 to automatically return to their original positions, realizing the lock cylinder reset function.

[0018] In practical implementation, a washer component 60 is fitted between the handle knob 20 and the mounting ring 11. This washer component 60 serves to buffer axial movement and guide rotation. The top of the washer component 60 has a first annular washer ring 61, and the bottom of the washer component 60 has a second annular washer ring 62. The first washer ring 61 and the second washer ring 62 are concentrically arranged. During installation, the first washer ring 61 and the second washer ring 62 abut against the upper and lower ends of the mounting ring 11, respectively, forming a clamping positioning that restricts the axial displacement of the washer component 60, ensuring its stable embedding between the handle knob 20 and the mounting ring 11. During use, when the user rotates the handle knob 20 to unlock or lock, the washer component 60 provides both buffering and guiding, effectively reducing frictional wear during rotation and improving operational smoothness and service life.

[0019] In practical implementation, the upper end of the handle knob 20 is provided with a handle connecting rod 23, which is a square rod used to reliably connect with an external knob or handle assembly.

[0020] In summary, the inner surface of the lock cylinder housing 10 is provided with a circular mounting protrusion 11. A mounting groove 12 is formed in the middle of the mounting protrusion 11, through which a handle knob 20 is connected. A return torsion spring 30 is sleeved on the outer side of the mounting protrusion 11. A guide plate 40 is sleeved on the outer side of the handle knob 20, positioned above the return torsion spring 30. A circular engaging groove 21 is recessed on the outer side of the handle knob 20, within which a fixing clamp 50 is fitted. The fixing clamp 50 presses the guide plate 40 tightly and securely fixes it to the outside of the handle knob 20. A washer component 60 is fitted between the handle knob 20 and the mounting protrusion 11. The lock cylinder assembly method of this utility model is compact and can realize multiple functions such as rotation control, angle limit and automatic reset. Through the cooperation between the mounting protrusion set in the lock cylinder housing and the handle knob, combined with the reset torsion spring, guide plate, fixing clamp, washer component and other structures, the operational stability and return reliability of the lock cylinder during the opening and closing process are effectively improved. At the same time, the cooperation between the limit block and the limit slot structure can accurately limit the rotation angle and prevent misoperation and mechanism damage; while the linkage between the toggle block and the torsion spring arm makes the reset process smooth and efficient, and the setting of the washer component provides a good buffer and friction reduction function.

Claims

1. A lock cylinder, characterized in that, It includes a lock cylinder housing (10), on the inner surface of which is a circular mounting protrusion (11). A mounting groove (12) is provided in the middle of the mounting protrusion (11), and a handle knob (20) is connected in the mounting groove (12). A reset torsion spring (30) is sleeved on the outer side of the mounting protrusion (11), and a guide plate (40) is sleeved on the outer side of the handle knob (20). The guide plate (40) is located above the reset torsion spring (30). A circular engagement groove (21) is recessed on the outer side of the handle knob (20), and a fixing clamp (50) is sleeved in the engagement groove (21). The guide plate (40) is pressed and fixed on the outer side of the handle knob (20) by the fixing clamp (50).

2. The lock cylinder according to claim 1, characterized in that, The handle knob (20) has symmetrical recessed limiting slots (22) on both sides, and the guide plate (40) has protruding limiting blocks (41) on both sides. The limiting blocks (41) cooperate with the limiting slots (22) to limit the connection.

3. The lock cylinder according to claim 2, characterized in that, The size of the limiting slot (22) is larger than the size of the limiting block (41).

4. The lock cylinder according to claim 1, characterized in that, The guide plate (40) has a toggle block (42) at its front end. The reset torsion spring (30) has a first torsion spring arm (31) on one side and a second torsion spring arm (32) on the other side. The toggle block (42) is located between the first torsion spring arm (31) and the second torsion spring arm (32).

5. The lock cylinder according to claim 1, characterized in that, A washer component (60) is fitted between the handle knob (20) and the mounting ring (11).

6. The lock cylinder according to claim 5, characterized in that, The top of the washer component (60) is provided with a first annular washer protrusion (61), and the bottom of the washer component (60) is provided with a second annular washer protrusion (62). The first washer protrusion (61) and the second washer protrusion (62) are concentrically arranged. The first washer protrusion (61) and the second washer protrusion (62) respectively abut against the upper end and the lower end of the mounting protrusion (11) to form a clamping positioning.

7. The lock cylinder according to claim 1, characterized in that, The upper end of the handle knob (20) is provided with a handle connecting rod (23), which is a square rod.

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