Knob handle and transmission

Abstract

The application provides a knob handle installed on a window sash, which is characterized by fixing a base on the window sash, and operating a second transmission assembly hidden in a twisting member by using the twisting member to cover the base, so that the second transmission assembly moves a first transmission assembly arranged in the window sash through transmission connection, effectively reducing the protrusion of a traditional handle on the visible surface of the window sash, avoiding the space left between the handle and the window sash, reducing the risk of collision and hanging objects, ensuring that the user will not be inconvenient or accidentally collide due to protruding parts during operation, and improving safety and user experience.

Description

Technical Field

[0001] This application relates to the field of window sash hardware, and more particularly to a knob-type handle and transmission device. Background Technology

[0002] Window handles, as indispensable hardware accessories in modern architecture, not only fulfill the basic function of opening and closing windows, but also directly affect the aesthetics of the window and even the entire building. However, conventional window handles on the market today often prioritize functionality in their design, neglecting their integration with the overall style of the window, causing the handle to become a factor affecting the window's appearance.

[0003] In existing technologies, most handles are driven by a lever, such as square shaft handles and lever handles. These handles drive the transmission mechanism by rotating or flicking the handle, thereby opening and closing the window sash. However, these handle designs share a common flaw: the handle protrudes from the visible surface of the window sash, such as L-shaped handles, beveled handles, curved handles, and curved flat handles. This protrusion creates a gap between the handle and the window sash when they are engaged, allowing the hand to grip the handle and operate it. This not only disrupts the streamlined design of the window sash, but the protruding handle can also cause collisions and injuries, and easily snag clothing or other items, leading to inconvenience, potential safety hazards, and a reduced user experience.

[0004] Therefore, there is a need for a knob-type handle and transmission device that can be installed on a window sash and reduce the impact of collisions and hanging objects. Utility Model Content

[0005] In view of this, it is necessary to provide a knob-type handle and transmission device that can be installed on the window sash and reduce the impact of collisions and hanging objects, in order to solve the above problems.

[0006] An embodiment of this application provides a rotary handle, installed on a window sash, comprising:

[0007] The base is fixedly connected to the window sash;

[0008] The knob assembly includes a second transmission assembly and a torsion member rotatably disposed on the base. The second transmission assembly is disposed in the inner cavity of the torsion member, and one end of the second transmission assembly is connected to the torsion member in a transmission manner, while the other end is connected to a first transmission assembly disposed inside the window sash. The torsion member covers the base.

[0009] In at least one embodiment of this application, the second transmission component includes:

[0010] A gear set is disposed between the base and the torsion member, and the gear set is connected to the first transmission assembly for transmission.

[0011] In at least one embodiment of this application, the gear set includes:

[0012] The first gear is located in the inner cavity of the torsion member and on the central axis of the torsion member;

[0013] The second gear meshes with the first gear, and the second gear has a first rotating hole located on the central axis of the second gear;

[0014] One end of the drive shaft is engaged in the first rotating hole, and the other end passes through the base and is connected to the first transmission assembly.

[0015] In at least one embodiment of this application, the knob assembly further includes a first fixing member, the base has a first fixing hole, the first fixing hole is directly opposite to the first gear, the first fixing member extends into the first fixing hole and is inserted into the central axis of the first gear to fix the base and the torsion member.

[0016] Embodiments of this application provide a transmission device, including a knob-type handle as described in any one of the claims, the transmission device including a first transmission component disposed within a window sash;

[0017] The first transmission component includes:

[0018] A fixed component is positioned directly opposite the knob component;

[0019] The third gear is disposed within the fixed assembly and is coaxial with the second gear. A second rotating hole is provided on the central axis of the third gear, and the transmission shaft is inserted into the second rotating hole.

[0020] A movable component is mounted on the fixed component and meshes with the third gear.

[0021] In at least one embodiment of this application, the moving component includes:

[0022] A cover plate, installed over the window sash;

[0023] A sliding rod is slidably connected inside the cover plate;

[0024] The sliding rod is provided with a gear rack, which is positioned opposite the third gear and meshes with it so that when the third gear rotates, the gear rack moves along the trajectory of the cover plate.

[0025] In at least one embodiment of this application, the fixing component includes:

[0026] A first fixing box is disposed on the cover plate;

[0027] The second fixing box is embedded in and abuts against the first fixing box. The second fixing box has a rotating cavity, which is directly opposite the cover plate. The third gear is located in the rotating cavity.

[0028] In at least one embodiment of this application, the base is provided with a second fixing hole;

[0029] The first transmission assembly further includes:

[0030] An anti-tilting component is slidably connected within the first fixing box;

[0031] The second fastener has one end extending into the second fixing hole and the other end fixedly connected to the anti-tilting member, so as to fix the base to the window sash.

[0032] In at least one embodiment of this application, the torsion member has a mounting hole, which is positioned opposite the second fixing hole.

[0033] In at least one embodiment of this application, the knob assembly further includes a protective cover, which is detachably disposed on the side opposite to the second transmission assembly to cover the mounting hole.

[0034] The aforementioned rotary handle, by fixing the base to the window sash and using a torsion member covered by the base to operate the second transmission component hidden inside the torsion member, allows the second transmission component to move the first transmission component located inside the window sash through a transmission connection. This effectively reduces the protrusion of the traditional handle on the visible surface of the window sash, thereby avoiding the space left between the handle and the window sash, reducing the risk of collision and hanging objects, and ensuring that the user will not experience inconvenience or accidental collision due to protruding parts during operation, thus improving safety and user experience. Attached Figure Description

[0035] Figure 1 This is an exploded view of the knob assembly in an embodiment of this application.

[0036] Figure 2 This is a schematic diagram of a rotary handle installed on a window sash according to an embodiment of this application.

[0037] Figure 3 This is an exploded view of the structure of the knob assembly, the first transmission assembly, and the window sash.

[0038] Figure 4 This is an exploded view of the first transmission component and gear set.

[0039] Figure 5This is an exploded view of the structure of the first transmission component in the embodiment of this application.

[0040] Figure 6 This is a top-down structural exploded view of the first transmission component.

[0041] Figure 7 This is a schematic diagram of the second fixing box.

[0042] Figure 8 This is an exploded view of the structure of the first and second fixing boxes.

[0043] Explanation of main component symbols

[0044] 100. A knob-type handle; 10. Base; 10a. First fixing hole; 10b. Second fixing hole; 20. Knob assembly; 21. Second transmission assembly; 211. Gear set; 2111. First gear; 2112. Second gear; 2112a. First rotating hole; 2113. Transmission shaft; 22. Torsion member; 22a. Mounting hole; 23. First fixing member; 30. First transmission assembly; 31. Fixing assembly; 311. First fixing box; 312. Second fixing box; 312a. Rotating cavity; 32. Third gear; 32a. Second rotating hole; 33. Moving assembly; 331. Cover plate; 332. Sliding rod; 3321. Gear rack; 34. Anti-tilting member; 35. Second fixing member; 40. Protective cover; 50. Window sash; 200. A transmission device. Detailed Implementation

[0045] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0046] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0047] An embodiment of this application provides a rotary handle, installed on a window sash, comprising:

[0048] The base is fixedly connected to the window sash;

[0049] The knob assembly includes a second rotating assembly and a torsion member rotatably disposed on the base. The second transmission assembly is disposed in the inner cavity of the torsion member, and one end of the second rotating assembly is connected to the torsion member in a transmission manner, while the other end is connected to a first transmission assembly disposed inside the window sash. The torsion member covers the base.

[0050] The aforementioned rotary handle, by fixing the base to the window sash and using a torsion member covered by the base to operate the second transmission component hidden inside the torsion member, allows the second transmission component to move the first transmission component located inside the window sash through a transmission connection. This effectively reduces the protrusion of the traditional handle on the visible surface of the window sash, thereby avoiding the space left between the handle and the window sash, reducing the risk of collision and hanging objects, and ensuring that the user will not experience inconvenience or accidental collision due to protruding parts during operation, thus improving safety and user experience.

[0051] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0052] according to Figures 1-8 A knob-type handle 100 is installed on a window sash 50, comprising: a base 10 fixedly connected to the window sash 50; a knob assembly 20, including a second transmission assembly 21 and a torsion member 22 rotatably disposed on the base 10, wherein the second transmission assembly 21 is disposed in the inner cavity of the torsion member 22, and one end of the second transmission assembly 21 is connected to the torsion member 22 in a transmission manner, and the other end is connected to a first transmission assembly 30 disposed inside the window sash 50, and the torsion member 22 covers the base 10.

[0053] Specifically, the first transmission assembly 30 transmits the rotational motion of the external knob assembly 20 to the opening or closing mechanism of the window sash 50. The torsion member 22 is an operable and rotatable part, which can be any structure such as circular or square. The user rotates the torsion member 22 by holding it with their fingers to open or close the window sash 50. The second transmission assembly 21 transmits the rotational motion of the torsion member 22 to the first transmission assembly 30, thereby driving the opening and closing action of the window sash 50.

[0054] The base 10, as part of the entire handle mounting, is fixedly connected to the window sash 50 by screws or the like, thereby reducing the space for the handle to protrude from the window sash 50. The mutual covering of the torsion member 22 and the base 10 creates a cavity between them, providing space for the knob assembly 20 to be set, thus making the operation of the entire rotating system smoother and reducing friction or instability between mechanical parts.

[0055] Furthermore, through the transmission connection between the first transmission component 30 and the second transmission component 21, the rotational force can be transmitted from the knob component 20 to the opening or closing mechanism of the window sash 50, ensuring that the window sash 50 can be opened and closed smoothly without any looseness or inconvenience in operation.

[0056] Furthermore, the other end of the second transmission component 21 is located within the inner cavity of the torsion member 22, making the structure of the torsion member 22 more compact. The torsion member 22 and the base 10 fit together on the surface of the window sash 50, thus concealing the internal mechanical structure, avoiding the protruding part of a traditional handle, and reducing the risk of collision and the problem of hanging objects caused by a protruding handle. For the "invisible" aesthetics of modern architectural design, this smooth design particularly meets the needs of modern users for the appearance of the window sash 50.

[0057] In summary, the torsion member 22 of the knob assembly 20 is flatly mounted on the window sash 50, and the user can gently rotate the torsion member 22 with their fingers or palm. Since the torsion member 22 is connected to the second transmission assembly 21, rotating the torsion member 22 causes the second transmission assembly 21 to rotate. The other end of the second transmission assembly 21 is connected to the first transmission assembly 30 inside the window sash 50, and the rotational force is transmitted to the opening or closing mechanism of the window sash 50 through this transmission chain. Through meshing transmission, the first transmission assembly 30 drives the locking or unlocking device of the window sash 50, allowing the window sash 50 to open or close smoothly.

[0058] In one specific embodiment, the second transmission component 21 includes a gear set 211 disposed between the base 10 and the torsion member 22, and the gear set 211 is connected to the first transmission component 30 in a transmission connection.

[0059] Specifically, the mutual covering of the torsion member 22 and the base 10 creates a cavity between them, providing space for the gear set 211 to be installed and also providing a protective space for the internal gear set 211. This makes the operation of the entire rotating system more stable and reduces friction or instability between mechanical parts.

[0060] Furthermore, the gear set 211, through its transmission connection with the first transmission component 30, transmits the torque on the knob to the switching mechanism of the first transmission component 30 inside the window sash 50. The gear set 211 typically consists of multiple gear sets 211 to ensure the stability and efficiency of power transmission. Compared to a traditional push-pull handle, the gear set 211 can generate a larger transmission torque within a smaller rotation range, reducing the force required for user operation.

[0061] In one specific embodiment, the gear set 211 includes: a first gear 2111 disposed in the inner cavity of the torsion member 22 and on the central axis of the torsion member 22; a second gear 2112 meshing with the first gear 2111, the second gear 2112 having a first rotating hole 2112a disposed on the central axis of the second gear 2112; and a transmission shaft 2113, one end of which is engaged in the first rotating hole 2112a, and the other end passing through the base 10 and being connected to the first transmission assembly 30.

[0062] Specifically, the first gear 2111 is fixedly mounted on the inner cavity of the torsion member 22, forming an integral part with the torsion member 22, and aligned with the central axis of the torsion member 22. This ensures that when the torsion member 22 is rotated, it can rotate around the first gear 2111 as the center point, making the torque transmission more uniform and stable. The first gear 2111 converts the force applied by the user through rotating the knob into mechanical power, and transmits it to the downstream components through meshing with the second gear 2112.

[0063] Furthermore, the second gear 2112 meshes with the first gear 2111 to transmit rotational motion. Through gear meshing, the second gear 2112 can receive the rotational force from the first gear 2111 and continue to transmit power downstream. The design of the second gear 2112 ensures smooth power transmission between the gear sets 211.

[0064] Furthermore, the drive shaft 2113 is a long rod with a prismatic structure. The hole shape of the first rotating hole 2112a matches the structure of the drive shaft 2113, so that the drive shaft 2113 can extend into the first rotating hole 2112a and be fixed. The drive shaft 2113 transmits rotational force from the second gear 2112 to the first transmission assembly 30, thereby driving the opening and closing mechanism of the window sash 50.

[0065] In summary, by rotating the torsion member 22, the user causes the first gear 2111 mounted on the torsion member 22 to rotate, transmitting rotational force. The rotational force is then transmitted to the second gear 2112 through the meshing of the first gear 2111 and the second gear 2112. The rotation of the second gear 2112 is transmitted through the transmission shaft 2113 in the first rotation hole 2112a. The transmission shaft 2113, by engaging with the first transmission assembly 30, ensures that the rotational force is stably transmitted to the first transmission assembly 30. The first transmission assembly 30 then actuates, pushing the locking or unlocking mechanism of the window sash 50, causing the window sash 50 to open or close.

[0066] In one specific embodiment, the knob assembly 20 further includes a first fixing member 23. The base 10 has a first fixing hole 10a, which is directly opposite to the first gear 2111. The first fixing member 23 extends into the first fixing hole 10a and is inserted into the central axis of the first gear 2111 to fix the base 10 and the torsion member 22.

[0067] Specifically, the first fixing member 23 is one of the following: screw, bolt, bolt, etc. By inserting the first fixing member 23 into the first fixing hole 10a and aligning it with the central axis of the first gear 2111, a stable connection between the base 10 and the torsion member 22 is ensured, and a firm combination between the torsion member 22 and the base 10 is ensured, so that the torsion member 22 and the base 10 form a whole and are jointly covered on the window sash 50. When the torsion member 22 is rotated, the torsion member 22 can rotate around the first fixing member 23 as the center, so that the first gear 2111 on the torsion member 22 also rotates, making the first gear 2111 rotate around the center point, so that the torque transmission is more uniform and stable.

[0068] This application provides a transmission device 200, including a knob-type handle 100 as described in any one of the claims. The transmission device includes a first transmission component 30 disposed within a window sash 50. The first transmission component 30 includes: a fixing component 31, which is disposed opposite to and engaged with the knob component 20; a third gear 32, which is disposed within the fixing component 31 and is coaxially disposed with the second gear 2112. A second rotating hole 32a is provided on the central axis of the third gear 32, and the transmission shaft 2113 is inserted into the second rotating hole 32a; and a moving component 33, which is disposed on the fixing component 31 and meshes with the third gear 32.

[0069] Specifically, the knob assembly 20 is connected to the fixed assembly 31 via a snap-fit ​​mechanism, maintaining a stable connection between the knob assembly 20 and the moving assembly 33, ensuring that force is directly transmitted when the knob rotates without displacement or loosening. The third gear 32 is coaxially arranged with the second gear 2112 to ensure that they remain synchronized during rotation.

[0070] Furthermore, the hole shape of the second rotating hole 32a matches the structure of the drive shaft 2113, allowing the drive shaft 2113 to extend into and be fixed within the second rotating hole 32a. This ensures that the drive shaft 2113 rotates synchronously with the third gear 32, transmitting the rotational force from the second gear 2112 to the third gear 32. The moving assembly 33, through its meshing connection with the third gear 32, further transmits the rotational force, driving the moving part of the window sash 50. The function of the moving assembly 33 is to convert the rotational force transmitted by the gears into the actual opening or closing action of the window sash 50.

[0071] In summary, when the user starts rotating the knob, the rotational force is transmitted to the second gear 2112 through the knob assembly 20. The second gear 2112 and the third gear 32 are coaxially connected through the transmission shaft 2113, so that the second gear 2112 and the third gear 32 rotate synchronously. The third gear 32 further drives the movement of the moving assembly 33 through gear meshing.

[0072] In one specific embodiment, the moving component 33 includes: a cover plate 331, which covers the window sash 50; and a sliding rod 332, which is slidably connected to the cover plate 331. The sliding rod 332 has a gear rack 3321, which is positioned opposite the third gear 32 and meshes with the third gear 32 so that when the third gear 32 rotates, the gear rack 3321 moves along the trajectory direction of the cover plate 331.

[0073] Specifically, the cover plate 331 is a track system that houses the sliding rod 332, mounted on the window sash 50, providing a fixed trajectory for the sliding rod 332. It ensures that the sliding rod 332 can slide freely within the cover plate 331 and maintain a stable path, thus ensuring smooth movement of the sliding rod 332. The sliding rod 332 slides freely within the cover plate 331 and, through its connection with the fixing assembly 31, can receive power from the third gear 32, converting this power into the opening and closing action of the window sash 50.

[0074] Furthermore, the rack 3321 is a gear-shaped structure formed on the sliding rod 332, which meshes with the third gear 32. When the third gear 32 rotates, the rack 3321 slides along the trajectory of the cover plate 331, causing the sliding rod 332 to produce a smooth displacement. This is the key drive part of the window sash 50 opening and closing system.

[0075] In summary, when the user rotates the knob, the torque of the knob assembly 20 is transmitted to the third gear 32 through the transmission system. The third gear 32 begins to rotate and meshes with the rack 3321. As the third gear 32 rotates, the rack 3321, guided by its upper gear portion, begins to slide along the trajectory of the cover plate 331. The movement of the rack 3321 causes the sliding rod 332 to slide within the cover plate 331.

[0076] In one specific embodiment, the fixing component 31 includes: a first fixing box 311 disposed on the cover plate 331; a second fixing box 312 embedded in and abutting against the first fixing box 311, wherein the second fixing box 312 has a rotating cavity 312a, the rotating cavity 312a is disposed opposite to the cover plate 331, and the third gear 32 is disposed in the rotating cavity 312a.

[0077] Specifically, the first fixing box 311 is a fixing component installed inside the cover plate 331, so that the second fixing box 312 can be accurately positioned and fixed thereon. The second fixing box 312 fits into the first fixing box 311, and the tight contact with the first fixing box 311 ensures the structural stability of the entire fixing assembly 31. The second fixing box 312 is provided with a rotating cavity 312a, which provides the necessary rotation space for the third gear 32, ensuring the free rotation and transmission efficiency of the third gear 32, preventing the third gear 32 from jamming due to space constraints, thereby enabling the third gear 32 to mesh with the gear rack 3321.

[0078] In one specific embodiment, the base 10 has a second fixing hole 10b; the first transmission assembly 30 further includes: an anti-slant member 34, which is slidably connected to the first fixing box 311; and a second fixing member 35, one end of which extends into the second fixing hole 10b and the other end is fixedly connected to the anti-slant member 34. When tightened, the anti-slant member 34 can be slid out to clamp the window sash 50, so that the base 10 is fixed on the window sash 50.

[0079] Specifically, the second fastener 35 can be a screw, bolt, or other type of fastener. The second fastener 35 is inserted into the second fixing hole 10b on the base 10, thereby achieving the connection between the knob assembly 20 and the second fixing box 312, and the fixed connection with the window sash 50.

[0080] Furthermore, a second fixing hole 10b is provided in the base 10 to facilitate the insertion of the second fixing member 35 and to fix the base 10, window sash 50, and second fixing box 312. The anti-pull-out member 34 is embedded in the first fixing box 311 and can slide within it. The anti-pull-out member 34 has a threaded structure, enabling a threaded connection with the second fixing member 35. When the second fixing member 35 is pulled, the anti-pull-out member 34 moves; and when tightened, it slides out to clamp the window sash 50 profile, thus fixing the base 10 to the window sash 50. In this embodiment, at least two anti-pull-out members 34 and two corresponding second fixing holes 10b are provided for fixing the base 10 and the second fixing box 312.

[0081] In one specific embodiment, the torsion member 22 is provided with a mounting hole 22a, which is positioned opposite the second fixing hole 10b.

[0082] Specifically, a mounting hole 22a is made on the torsion member 22, which is directly opposite to the second fixing hole 10b made in the base 10, so that the mounting hole 22a and the second fixing hole 10b can form a channel structure to facilitate the insertion of the second fixing member 35 and fix the torsion member 22, the base 10, the window sash 50 and the second fixing box 312.

[0083] In one specific embodiment, the knob assembly 20 further includes a protective cover 40, which is detachably disposed on the side opposite to the second transmission assembly 21 to cover the mounting hole 22a.

[0084] Specifically, the protective cover 40 can be made of metal, plastic, or wood, further serving a decorative purpose. By sealing the mounting hole 22a and the second fixing hole 10b, the protective cover 40 effectively prevents dust, dirt, or moisture from entering the equipment. From an aesthetic perspective, the protective cover 40 serves as a concealment, covering unnecessary openings and making the entire knob assembly 20 appear cleaner and smoother, thus enhancing the product's appearance.

[0085] Therefore, the aforementioned knob-type handle 100, by covering the base 10 onto the window sash 50 and using the torsion member 22 covered on the base 10 to operate the second transmission component 21 hidden within the torsion member 22, causes the first transmission component 30 located within the window sash 50 to move through the transmission connection of the second transmission component 21. This effectively reduces the protrusion of the traditional handle on the visible surface of the window sash 50, thereby avoiding the space left between the handle and the window sash 50, reducing the risk of collision and hanging objects, ensuring that the user will not experience inconvenience or accidental collision due to protruding parts during operation, and improving safety and user experience.

[0086] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A knob handle mounted on a sash, characterized in that, include: The base is fixedly connected to the window sash; The knob assembly includes a second transmission assembly and a torsion member rotatably disposed on the base. The second transmission assembly is disposed in the inner cavity of the torsion member, and one end of the second transmission assembly is connected to the torsion member in a transmission manner, while the other end is connected to a first transmission assembly disposed inside the window sash. The torsion member covers the base.

2. A knob handle according to claim 1, wherein The second transmission assembly includes: A gear set is disposed between the base and the torsion member, and the gear set is connected to the first transmission assembly for transmission.

3. A knob handle according to claim 2, wherein The gear set includes: The first gear is located in the inner cavity of the torsion member and on the central axis of the torsion member; The second gear meshes with the first gear, and the second gear has a first rotating hole located on the central axis of the second gear; One end of the drive shaft is engaged in the first rotating hole, and the other end passes through the base and is connected to the first transmission assembly.

4. A knob handle according to claim 3, wherein The knob assembly further includes a first fixing member. The base has a first fixing hole, which is directly opposite to the first gear. The first fixing member extends into the first fixing hole and is inserted into the central axis of the first gear to fix the base and the torsion member.

5. A transmission comprising a knob handle according to any one of claims 1-4, characterized in that The transmission device includes a first transmission component disposed inside the window sash. The first transmission component includes: A fixed component is positioned directly opposite the knob component; The third gear is disposed within the fixed assembly and is coaxial with the second gear. A second rotating hole is provided on the central axis of the third gear, and the transmission shaft is inserted into the second rotating hole. A movable component is mounted on the fixed component and meshes with the third gear.

6. A transmission according to claim 5, wherein The moving component includes: A cover plate, installed over the window sash; A sliding rod is slidably connected inside the cover plate; The sliding rod is provided with a gear rack, which is positioned opposite the third gear and meshes with it so that when the third gear rotates, the gear rack moves along the trajectory of the cover plate.

7. A transmission according to claim 6, wherein The fixing component includes: A first fixing box is disposed on the cover plate; The second fixing box is embedded in and abuts against the first fixing box. The second fixing box has a rotating cavity, which is directly opposite the cover plate. The third gear is located in the rotating cavity.

8. A transmission according to claim 7, characterised in that The base has a second fixing hole; The first transmission assembly further includes: An anti-tilting component is slidably connected within the first fixing box; The second fastener has one end extending into the second fixing hole and the other end fixedly connected to the anti-tilting member, so as to fix the base to the window sash.

9. A transmission according to claim 8, wherein The torsion member has a mounting hole, which is positioned opposite the second fixing hole.

10. A transmission according to claim 9, wherein The knob assembly also includes a protective cover, which is detachably located on the side opposite to the second transmission assembly to cover the mounting hole.

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