An ultra-narrow door lock handle reversing clutch assembly

Abstract

The application discloses a super-narrow door lock handle reversing clutch assembly, which comprises a square steel clutch bin, a clutch pin, a handle, a handle transmission shaft, a toggle piece, a torsional spring and a fingerprint unlocking module, the toggle piece is attached to the handle transmission shaft through a screw, and the toggle piece is matched with the torsional spring; the application can realize universal reversing without disassembling the screw in the handle hole, the clutch pin is inserted into the handle transmission shaft by relying on a driving motor, and the handle can be rotated to adapt to left / right door opening; the fingerprint unlocking is integrated in the handle, does not interfere with reversing and does not additionally increase the thickness, through innovative design, the handle fixed handle transmission shaft can be rotated and reversed by 360 degrees, the connection wire harness of the fingerprint module and the main board is not damaged, the width of the assembly is simplified to 28 mm, and the problem that a super-narrow lock cannot be reversed by one grip is solved.

Description

Technical Field

[0001] This utility model relates to the field of door locks, specifically to an ultra-narrow door lock handle reversing clutch assembly. Background Technology

[0002] The door lock handle reversing clutch assembly is the core operating component of the door lock. Its versatility, ease of operation, and compact structure directly affect the user experience and market adaptability of the door lock.

[0003] Currently, there are two main problems with door lock handle reversing clutch assemblies on the market: One type is traditional door lock handle reversing clutch assemblies that only support opening in one direction (left or right). Manufacturers need to produce two different models, resulting in poor versatility and confusion for consumers, leading to increased procurement and usage costs. The other type is door lock handle reversing clutch assemblies that have been improved to allow for left-right interchangeability. The closest prior art to this application is the utility model patent with authorization announcement number CN206174640U. It discloses a door lock handle assembly that, through the cooperation of a handle drive shaft, rotating plate, torsion spring, actuating plate, and limiting plate, achieves left-right interchangeability without disassembling the handle, thus solving the problem of poor versatility in traditional door locks to some extent.

[0004] However, the above-mentioned technologies and other existing interchangeable door lock handle reversing clutch assemblies still have the following shortcomings that urgently need improvement: The reversing operation is cumbersome: Reversing the traditional door lock handle requires removing the fixing screws inside the handle hole, which is not only complicated (difficult for non-professionals to complete), but repeated disassembly can also easily lead to stripped screws and loose handle installation, affecting the service life of the door lock. Poor fingerprint module compatibility: The one-grip handle needs to integrate a fingerprint unlocking module, but the existing integration method will increase the thickness of the handle, which cannot be adapted to ultra-narrow door lock panels with a width of less than 30mm, thus limiting the functional expansion of the door lock. The wiring harness is easily damaged when the handle is reversed: When the handle is reversed, the wiring harness connecting the fingerprint module and the motherboard is easily broken due to rotation and pulling, which will cause the fingerprint unlocking function to fail and the repair cost is high. Conflict between clutch and reversing structure: The existing clutch and reversing structure layout is redundant. Either the size is too large to be adapted to ultra-narrow door locks, or the clutch action (unlocking) and reversing action logic overlap, resulting in problems such as "unlocking jam" and "incomplete reversing". Insufficient structural stability: The large clearance between the drive shaft, actuating plate, and other components of the door lock handle can easily lead to loosening and abnormal noises after long-term use. The handle's reset spring force is uneven, affecting the user's operating feel. Summary of the Invention

[0005] This utility model aims to solve one of the technical problems existing in the prior art.

[0006] This application provides an ultra-narrow door lock handle reversing clutch assembly, including a handle drive shaft for passing through the door lock panel and transmitting rotational force, a toggle plate attached to the handle drive shaft by screws, a torsion spring sleeved on the outside of the handle drive shaft, and a clutch unit for connecting with an external handle. The toggle plate is provided with a pair of buckles for cooperating with the two ends of the torsion spring to apply a rotational spring force to the handle drive shaft.

[0007] The clutch unit includes a clutch chamber, a clutch groove, and a clutch pin. The clutch chamber is rotatably mounted on the handle drive shaft for mounting an external handle. The clutch pin is floatingly mounted on one side of the clutch chamber. The clutch groove is located at the end of the handle drive shaft. The clutch pin moves in and out of the clutch groove through a clutch driver on the external handle.

[0008] The clutch driver is a motor, and the output shaft is connected to a push plate via a threaded transmission.

[0009] The clutch chamber has at least one mounting square hole, which is a countersunk hole structure, used to fix the external handle.

[0010] The handle drive shaft has an integrally formed flange structure, and the flange has at least two screw mounting holes for locking the toggle plate.

[0011] There is a pair of screws. The outer end of the first screw is flush with the surface of the flange, and the outer end of the second screw is higher than the surface of the flange. It also includes a pair of limit blocks fixed on the clutch chamber, which cooperate with the outer end of the second screw to limit the angle at which the clutch chamber and the handle drive shaft can rotate relative to each other.

[0012] A pair of latches are symmetrically distributed circumferentially along the actuating piece.

[0013] It also includes washers, which are made of elastic material and are fitted onto the side of the toggle plate away from the flange of the handle drive shaft.

[0014] The gap between the inner diameter of the washer and the diameter of the handle drive shaft should not exceed 0.1mm.

[0015] The handle drive shaft has a hollow structure in the middle to accommodate the internal transmission mechanism of the door lock.

[0016] The beneficial effects of this utility model are as follows: 1. Convenient and efficient reversing operation: The clutch pin is controlled by the drive motor to move forward and backward, so the handle can be "universally reversed" without removing the screws in the handle hole. Even non-professionals can quickly adapt to the left / right door opening direction, solving the pain point of the traditional cumbersome reversing operation. Perfectly adapted to ultra-narrow door locks: Through innovative layouts such as hollow design of handle drive shaft, axial integration of motor, and compact arrangement of components, the overall width of components is reduced to 28mm. At the same time, the fingerprint unlocking module is integrated into the handle without adding extra component thickness, breaking through the technical limitation that "one-grip fingerprint handles cannot be adapted to ultra-narrow door locks". 2. Dual reliability of reversing and wiring harness: After the handle and handle drive shaft are fixed, they can rotate 360 ​​degrees to reverse. The wiring harness connecting the fingerprint module and the motherboard has a redundant length to accommodate the rotation. Combined with the "non-linkage reversing" action after the clutch pin is disengaged, the wiring harness is prevented from being pulled and broken, ensuring long-term stability. 3. Clear unlocking and reversing logic: The fingerprint unlocking module is linked to the drive motor. When unlocking, the motor pushes into the clutch pin, realizing the synchronous rotation of the clutch chamber and the handle drive shaft (completing the unlocking); when reversing, the motor retracts from the clutch pin, releasing the linkage constraint between the two (achieving free reversing), completely solving the problem of "conflict between unlocking and reversing actions"; 4. Excellent structural stability and feel: The actuating plate is attached to the flange of the handle drive shaft by screws. With the help of circumferentially symmetrical buckles and torsion springs, the handle reset force is uniform and stable, improving the operating feel. The elastic washer cushions the impact on the components and ensures the coaxiality of the drive shaft and surrounding components, reducing loosening and abnormal noise. The combination of high and low screws and limit blocks restricts the reversing angle, avoids damage to components caused by excessive rotation, and further extends the service life of the components. Attached Figure Description

[0017] Figure 1 This is a perspective view of the assembly state of the ultra-narrow door lock handle reversing clutch assembly in the embodiments of this application; Figure 2 This is an exploded view of the ultra-narrow door lock handle reversing clutch assembly in an embodiment of this application.

[0018] Figure Labels 1-Washer, 2-Handle drive shaft, 21-Flange, 22-Screw mounting hole, 4-Clutch chamber, 5-Torsion spring, 6-Pulley, 61-Snap fastener, 7-Clutch pin, 8-Clutch groove. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] The ultra-narrow door lock handle reversing clutch assembly provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0022] Example 1: This application provides an ultra-narrow door lock handle reversing clutch assembly, including a handle drive shaft 2 for passing through the door lock panel and transmitting rotational force, a lever 6 attached to the handle drive shaft 2 by screws, a torsion spring 5 sleeved on the outside of the handle drive shaft 2, and a clutch unit for connecting with an external handle. The lever 6 is provided with a pair of buckles 61 for cooperating with the two ends of the torsion spring 5 to apply a rotational spring force to the handle drive shaft 2.

[0023] like Figures 1 to 2 As shown, the aforementioned structure enables the component to possess basic and reliable transmission and reset functions. Specifically, the handle drive shaft 2 adopts an integrated, streamlined design with no redundant protrusions on the shaft body, effectively controlling the radial width of the component and laying the foundation for adapting to 28mm ultra-narrow door lock panels. The actuating plate 6 is fixed to the handle drive shaft 2 by screw fastening, which provides higher connection strength compared to welding or snap-fit ​​connections 61, and facilitates subsequent maintenance and disassembly. The tightness of the screw fastening also prevents the actuating plate 6 from loosening or shifting after long-term use. A pair of snap-fits 61 on the actuating plate 6 precisely engage with both ends of the torsion spring 5, stably applying rotational force to the handle drive shaft 2, ensuring that the handle can quickly reset to its initial position after rotation, preventing the door lock from failing to lock properly due to reset lag. Furthermore, the limiting effect of the snap-fits 61 on the torsion spring 5 prevents axial movement of the torsion spring 5 under stress deformation, improving the stability and service life of the component's transmission. In addition, the basic structure is compact, with each component arranged sequentially along the handle drive shaft 2, without occupying any lateral space, which further meets the installation space requirements of ultra-narrow door locks.

[0024] Example 2: In this embodiment, in addition to the structural features of the aforementioned embodiments, the clutch unit includes a clutch chamber 4, a clutch groove 8, and a clutch pin 7. The clutch chamber 4 is rotatably sleeved on the handle drive shaft 2 for mounting an external handle. The clutch pin 7 is floatingly mounted on one side of the clutch chamber 4. The clutch groove 8 is opened at the end of the handle drive shaft 2, and the clutch pin 7 is controlled to move in and out of the clutch groove 8 by the clutch driver on the external handle.

[0025] In this embodiment of the application, the clutch driver is a motor, and the output shaft is connected to a push plate via a threaded transmission.

[0026] like Figures 1 to 2 As shown, due to the aforementioned structure, the core logic of "fingerprint unlocking - clutch engagement - power transmission" is precisely realized, while also taking into account the flexibility of reversing and the requirements of ultra-narrow size design, correcting the previous mismatch between clutch action and function. Specifically, the clutch chamber 4 is rotatably mounted on the handle drive shaft 2, and the two can rotate relative to each other under normal conditions (leaving space for reversing). The external handle is fixedly installed on the clutch chamber 4, and only when the clutch pin 7 is inserted into the groove can the handle drive shaft 2 be driven to rotate synchronously through the clutch chamber 4, ensuring the controllability of the unlocking action. The fingerprint unlocking module and motor are linked, and the motor is only triggered after successful unlocking, avoiding misoperation or illegal unlocking and improving door lock security; moreover, the motor and fingerprint module are integrated in the handle area, using an axial layout rather than a radial protrusion, which does not occupy additional radial space of the clutch chamber 4, providing a key structural guarantee for the component to achieve an ultra-narrow width of 28mm.

[0027] The core functions of the clutch pin 7 and clutch groove 8 are twofold: first, unlocking transmission. After successful fingerprint unlocking, the motor drives the push plate forward via threaded transmission, precisely pushing the clutch pin 7 into the clutch groove 8 of the clutch chamber 4. At this time, the clutch chamber 4 and the handle drive shaft 2 form a rigid linkage. Rotating the handle will drive the handle drive shaft 2 to rotate synchronously, thereby driving the internal transmission mechanism of the door lock to complete the unlocking. Second, reversing separation. When it is necessary to adapt to the left / right opening direction, the motor drives the push plate to reset in the opposite direction, the clutch pin 7 exits the clutch groove 8, and the clutch chamber 4 and the handle drive shaft 2 are disengaged. At this time, the handle can be freely rotated (driving the clutch chamber 4) to adjust the direction without driving the handle drive shaft 2 to rotate, thus avoiding interference with the internal structure of the door lock. After the reversal is completed, the clutch pin 7 is repositioned into the groove to lock the transmission relationship.

[0028] The motor utilizes a threaded drive to power the push plate, offering advantages over gear and linkage drives in terms of high transmission precision and uniform force distribution. This allows for precise control of the clutch pin 7's forward and backward travel, preventing issues such as jamming, positioning deviations, or incomplete clutch engagement. Furthermore, the threaded drive is self-locking, ensuring the clutch pin 7 maintains its current position after entering or exiting the slot without requiring additional limit or locking structures, further simplifying the component layout. This transmission structure occupies minimal axial space and does not increase the component's radial width, perfectly meeting the compact design requirements of ultra-narrow door locks. It effectively solves the technical pain point of traditional clutch reversing structures being too large and logically complex to adapt to 28mm ultra-narrow door locks. Simultaneously, the floating installation design of the clutch pin 7 compensates for minor gaps during assembly, ensuring precise engagement with the clutch slot 8 and improving the component's assembly tolerance and long-term reliability.

[0029] Example 3: In this embodiment, in addition to the structural features of the aforementioned embodiments, the clutch chamber 4 is provided with at least one mounting square hole, which is a countersunk hole structure used to fix the external handle.

[0030] like Figures 1 to 2 As shown, the aforementioned structure enhances the assembly stability of the external handle and clutch chamber 4, avoids interference with reversing actions after assembly, and simultaneously achieves a compact size and clean appearance. The square mounting holes, compared to round holes, precisely fit the square mounting end of the external handle, enabling direct torque transmission and preventing relative slippage during handle rotation, thus ensuring transmission reliability. The countersunk hole design allows the heads of fasteners (such as screws) securing the external handle to be fully embedded within the holes, preventing them from protruding from the clutch chamber 4 surface. This avoids fastener protrusions interfering with the relative rotation of the clutch chamber 4 and the handle drive shaft 2, ensuring smooth reversing actions. Furthermore, it results in a smoother, cleaner component appearance, reducing dust accumulation and the risk of impacts. In addition, the number of at least one mounting square hole can be flexibly adjusted according to the size requirements of the external handle (such as setting two symmetrically distributed square holes), which improves the adaptability of the components. Moreover, the mounting square holes are opened in the non-transmission area of ​​the clutch chamber 4, which will not weaken the structural strength of the clutch chamber 4. While ensuring the assembly firmness, the spatial layout of the components is further optimized, which meets the compact design requirements of ultra-narrow door locks.

[0031] Example 4: In this embodiment, in addition to the structural features of the aforementioned embodiments, a flange 21 structure is integrally formed on the handle drive shaft 2, and the flange 21 is provided with at least two screw mounting holes 22 for locking the toggle piece 6.

[0032] In this embodiment of the application, there is a pair of screws. The outer end of the first screw is flush with the surface of the flange 21, and the outer end of the second screw is higher than the surface of the flange 21. It also includes a pair of limiting blocks fixed on the clutch chamber 4, which cooperate with the outer end of the second screw to limit the angle at which the clutch chamber 4 and the handle drive shaft 2 can rotate relative to each other.

[0033] like Figures 1 to 2 As shown, the above-mentioned structure significantly improves the structural stability and reversing safety of the components, while simplifying the assembly process. The handle drive shaft 2 and the flange 21 are integrally formed, which reduces the assembly gap and improves the overall structural rigidity compared to a separate connection. It can effectively withstand the torque when the handle rotates, and prevent the flange 21 from loosening or deforming after long-term use. At the same time, the flange 21 increases the contact area with the actuating plate 6, making the force more even when the screws are tightened, further improving the fixing reliability of the actuating plate 6. The setting of at least two screw mounting holes 22 (such as two symmetrically distributed holes) can prevent the actuating plate 6 from rotating circumferentially relative to the drive shaft, ensuring the accuracy of the engagement between the actuating plate 6 and the torsion spring 5. Furthermore, the design of the high and low screws and the limiting block achieves precise limiting of the reversing angle. When the clutch pin 7 exits the clutch groove 8 to reverse direction, and the clutch chamber 4 rotates relative to the drive shaft, the limiting block will contact the exposed end of the second screw, thereby limiting the maximum relative rotation angle between the two (e.g., within 180°). This prevents excessive rotation from causing the internal connecting harness to break or the torsion spring 5 to be damaged due to excessive deformation, thus improving the service life and safety of the component. The design of the outer end of the first screw being flush with the flange 21 avoids it from interfering with the movement of the limiting block, ensuring smooth operation of the limiting structure. Moreover, the overall limiting structure does not require much additional space. By cleverly utilizing the structure of the screw and the flange 21, functional integration is achieved, which fits the compact design concept of ultra-narrow size components.

[0034] Example 5: In this embodiment, in addition to the structural features of the aforementioned embodiments, a pair of latches 61 are symmetrically distributed circumferentially along the actuating piece 6.

[0035] like Figures 1 to 2As shown, the aforementioned structure makes the force on both ends of the torsion spring 5 more uniform, thereby improving the stability and consistency of the handle's reset and optimizing the force state of the actuating plate 6. The buckles 61 are symmetrically distributed circumferentially, ensuring that the restraining forces on both ends of the torsion spring 5 are equal in magnitude and symmetrical in direction when the torsion spring 5 is limited by the buckles 61. This ensures that the torsion spring 5 maintains coaxiality with the handle drive shaft 2 during deformation, preventing the torsion spring 5 from shifting or jamming due to uneven force. This allows the handle to obtain a smooth and uniform rotational force after rotation, achieving precise reset and improving the user's feel. In addition, the symmetrically distributed buckles 61 ensure that the actuating plate 6 is subjected to symmetrical force points when bearing the reaction force of the torsion spring 5, reducing local stress concentration on the actuating plate 6 and preventing the buckles 61 from breaking or deforming after long-term use, thus extending the service life of the actuating plate 6. Meanwhile, the symmetrical structure facilitates processing and manufacturing, reduces the difficulty of mold design and production, improves production efficiency, and the symmetrical layout makes the overall structure of the toggle piece 6 more balanced, further adapting to the ultra-narrow size design of the components, and will not affect the assembly of surrounding parts due to local structural protrusions.

[0036] Example 6: In this embodiment, in addition to the structural features of the aforementioned embodiments, a washer 1 is also included, which is an elastic material and is sleeved on the side of the actuating piece 6 away from the flange 21 of the handle drive shaft 2.

[0037] In this embodiment of the application, the gap between the inner diameter of the washer 1 and the diameter of the handle drive shaft 2 is no greater than 0.1 mm.

[0038] like Figures 1 to 2 As shown, the aforementioned structure achieves multiple functions including buffering, sealing, and coaxiality assurance without compromising the ultra-narrow size design of the component. The elastic gasket 1 (such as rubber or silicone) effectively buffers the axial impact force of the actuating plate 6 during the rotation and reset of the handle, reducing hard friction between the actuating plate 6 and surrounding components, lowering operating noise, preventing component wear, and extending the component's service life. The gasket 1, fitted onto the outside of the actuating plate 6, fills the assembly gap between the actuating plate 6 and surrounding components, providing a certain degree of sealing to prevent dust, moisture, and other impurities from entering the component, avoiding internal structural corrosion or jamming, and improving the component's environmental adaptability. In addition, the gap between the inner diameter of washer 1 and the shaft diameter of the handle drive shaft 2 is no more than 0.1mm, which can ensure the coaxiality of washer 1 and drive shaft, avoid the offset of washer 1 during assembly or use, and thus prevent interference with the normal operation of the actuating plate 6 and torsion spring 5, ensuring the smooth transmission of the component; the thickness of elastic washer 1 can be precisely controlled (e.g., set to 1-2mm), without increasing the axial width of the component, perfectly matching the size requirements of the 28mm ultra-narrow door lock, improving the performance of the component without sacrificing the advantage of ultra-narrow size.

[0039] Example 7: In this embodiment, in addition to the structural features of the aforementioned embodiments, the central part of the handle drive shaft 2 is a hollow structure, which is used to adapt to the internal transmission mechanism of the door lock.

[0040] like Figures 1 to 2 As shown, the aforementioned structure, while ensuring the strength of the drive shaft, further simplifies the component layout, enhancing the component's adaptability and ultra-narrow size advantage. The hollow structure effectively reduces the weight of the handle drive shaft 2, lowers the load-bearing pressure on the door lock panel, and reduces material usage, thus lowering production costs. More importantly, the hollow channel can accommodate internal drive components (such as square steel, drive rods) or connecting harnesses (such as the fingerprint unlocking module's harness), eliminating the need for additional external installation space. This significantly optimizes the component's radial layout, providing crucial support for achieving the ultra-narrow 28mm width. Furthermore, the hollow drive shaft's design allows for optimized wall thickness (e.g., setting the wall thickness to 2-3mm) to ensure torque transmission capacity, guaranteeing stable power transmission during handle rotation and preventing structural strength deficiencies due to the hollow design. Simultaneously, the axially continuous design of the hollow channel facilitates the assembly and maintenance of internal components, improving assembly efficiency and adapting to different types of door lock internal transmission mechanisms, expanding the component's applicability and enhancing the product's market competitiveness.

[0041] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0042] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A reversing clutch assembly for an ultra-narrow door lock handle, characterized in that, It includes a handle drive shaft that passes through the door lock panel and transmits rotational force, a lever plate that is attached to the handle drive shaft by screws, a torsion spring that is sleeved on the outside of the handle drive shaft, and a clutch unit for connecting with an external handle. The lever plate is provided with a pair of buckles that cooperate with the two ends of the torsion spring to apply a rotational spring force to the handle drive shaft. It also includes a washer, which is made of elastic material and is fitted onto the side of the actuating piece away from the flange of the handle drive shaft.

2. The ultra-narrow door lock handle reversing clutch assembly according to claim 1, characterized in that, The clutch unit includes a clutch chamber, a clutch groove, and a clutch pin. The clutch chamber is rotatably sleeved on the handle drive shaft for mounting an external handle. The clutch pin is floatingly mounted on one side of the clutch chamber. The clutch groove is opened at the end of the handle drive shaft. The clutch pin moves in and out of the clutch groove through a clutch driver on the external handle.

3. The ultra-narrow door lock handle reversing clutch assembly according to claim 2, characterized in that, The clutch driver is a motor, and the output shaft is connected to a push plate via a threaded transmission.

4. The ultra-narrow door lock handle reversing clutch assembly according to claim 2, characterized in that, The clutch chamber has at least one mounting square hole, which is a countersunk hole structure, used to fix the external handle.

5. The ultra-narrow door lock handle reversing clutch assembly according to claim 2, characterized in that, The handle drive shaft has an integrally formed flange structure, and the flange has at least two screw mounting holes for locking the toggle piece.

6. The ultra-narrow door lock handle reversing clutch assembly according to claim 5, characterized in that, The screws are a pair, with the outer end of the first screw flush with the flange surface and the outer end of the second screw higher than the flange surface. It also includes a pair of limiting blocks fixed on the clutch chamber, which cooperate with the outer end of the second screw to limit the angle at which the clutch chamber and the handle drive shaft can rotate relative to each other.

7. The ultra-narrow door lock handle reversing clutch assembly according to claim 1, characterized in that, The pair of latches are symmetrically distributed circumferentially along the actuating piece.

8. The ultra-narrow door lock handle reversing clutch assembly according to claim 1, characterized in that, The gap between the inner diameter of the washer and the diameter of the handle drive shaft is no more than 0.1 mm.

9. The ultra-narrow door lock handle reversing clutch assembly according to claim 1, characterized in that, The handle drive shaft has a hollow structure in the middle to accommodate the internal transmission mechanism of the door lock.

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