Adjustable lock seat structure and door or window

By designing an adjustable lock seat structure and using a lead screw to drive the adjustment block to move, the problem of reduced effective length of the lock seat and lock rod caused by the narrowing of the screen window is solved, ensuring the stability and reliability of the screen window locking.

CN224468930UActive Publication Date: 2026-07-07SHENZHEN HOPO WINDOW CONTROL TECH CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN HOPO WINDOW CONTROL TECH CO LTD
Filing Date
2025-02-25
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

The traditional lock seat structure is not adjustable, which reduces the effective length of the lock seat and lock rod when the screen window is narrowed, weakening the locking ability and affecting the stability and reliability of the screen window.

Method used

An adjustable lock seat structure was designed, including a base plate and an adjusting block. The adjusting block is driven by a screw structure to move closer to or further away from the base plate along the waistline of the screen window, ensuring that the effective mounting length of the lock rod is not affected.

Benefits of technology

By adjusting the lock seat structure, the position of the lock bar can be adjusted according to the waistline of the screen window, maintaining the stability and reliability of the locked state and preventing locking failure due to deformation.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The application provides an adjustable lock seat structure and a door or window for dealing with the waist collection of a screen window. The adjustable lock seat structure comprises a bottom plate and an adjusting block. The bottom plate is provided with a lead screw structure. The lead screw structure is in transmission connection with the adjusting block. The lead screw structure drives the adjusting block to move close to or away from the bottom plate along the waist collection direction of the screen window relative to the bottom plate. The adjustable lock seat structure and the door or window provided above provide a stable support platform by designing the bottom plate as the basis of the lock seat structure. The adjusting block is designed as the key component for solving the waist collection problem of the screen window. The adjusting block can adjust its position according to the waist collection condition of the screen window, so as to ensure that the effective loading length of the lock rod is not affected. The lead screw structure is a commonly used transmission mechanism. The linear movement of the adjusting block can be realized by rotating the lead screw. This design allows the user to adjust the position of the adjusting block by rotating the lead screw according to the waist collection degree of the screen window, so that the adjusting block moves close to or away from the bottom plate.
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Description

Technical Field

[0001] This application relates to the field of door and window hardware technology, and in particular to an adjustable lock seat structure and a door or window. Background Technology

[0002] In the existing installation and use of screen windows, the lock seat structure, as a key component of the screen window locking system, undertakes the important function of fixing and locking the screen window.

[0003] However, traditional lock seat structures are mostly designed to be fixed and lack adjustment capabilities. During the manufacturing process of window screens, as the size of the screen increases, a noticeable "waisting" phenomenon occurs. This waisting, where the middle section of the screen frame bends inward in the vertical direction, is a common deformation. This deformation not only affects the aesthetics of the screen but, more importantly, alters the distance between the lock seat and the locking rod it originally engaged with. Specifically, when the screen waists, the lock seat is positioned further away from the locking rod, meaning the effective length of the locking rod resting on the lock seat is reduced. This change directly weakens the locking ability of the lock seat and locking rod, significantly reducing the stability and reliability of the screen when locked.

[0004] While it's possible to design matching lock seats for every size of screen window to address this waist-narrowing phenomenon, this would increase the number of lock seat product models. Producing so many different lock seat models would increase the burden on factories and be detrimental to production.

[0005] Therefore, in view of the problems existing in the prior art, it is necessary to develop an adjustable lock seat structure and door or window with adjustable function that can cope with the phenomenon of screen window waisting, so as to improve the reliability and tightness of screen window locking, ensure home security, and extend the service life of screen window. Utility Model Content

[0006] In view of this, it is necessary to provide an adjustable lock seat structure and a door or window to solve the problem that when the screen window is narrowed, the position of the lock seat relative to the lock bar becomes more remote, and the reduced effective length of the lock bar mounted on the lock seat weakens the locking ability when the lock seat and lock bar are engaged.

[0007] Embodiments of this application provide an adjustable locking seat structure for accommodating the tapering of screen windows, comprising:

[0008] Base plate, used for fixing to the window frame;

[0009] An adjusting block is provided with a lead screw structure. One end of the lead screw structure is rotatably connected to the base plate, and the other end is drively connected to the adjusting block. The lead screw structure is used to drive the adjusting block to move closer to or away from the base plate along the waist-slimming direction of the screen relative to the base plate.

[0010] In at least one embodiment of this application, the lead screw structure includes:

[0011] A rivet shaft is provided on the base plate, and the adjusting block is slidably connected to the rivet shaft. The length direction of the rivet shaft is parallel to the waist-slimming direction of the screen window relative to the base plate.

[0012] In at least one embodiment of this application, the lead screw structure further includes:

[0013] A rivet is rotatably connected to the base plate. The rivet is threadedly connected to the adjusting block. The length direction of the rivet is parallel to the tapering direction of the screen relative to the base plate.

[0014] In at least one embodiment of this application, a washer is fitted on the rivet, and the washer is in contact with the side of the base plate opposite to the adjusting block.

[0015] In at least one embodiment of this application, the base plate is provided with at least one grommet screw, and the base plate is fixed to the window frame by the grommet screw.

[0016] In at least one embodiment of this application, the number of the nut screws is two, and they are symmetrically distributed on both sides of the adjusting block.

[0017] The adjusting block has a threaded hole that passes through it, and the rivet is bolted to the threaded hole.

[0018] In at least one embodiment of this application, a bent portion is provided on the side of the base plate away from the adjusting block, and a protrusion is provided on the side of the base plate facing the adjusting block. The protrusion and the bent portion respectively abut against the mounting groove of the window frame.

[0019] Embodiments of this application provide a door or window including the aforementioned adjustable lock seat structure.

[0020] The aforementioned adjustable lock seat structure and door / window design utilize a base plate as the foundation, providing a stable support platform. An adjustable block is a key component designed to address the issue of screen window tapering. The adjustable block can be positioned according to the screen window's tapering degree, ensuring the effective mounting length of the lock rod remains unaffected. A lead screw structure is a commonly used transmission mechanism; rotating the lead screw allows for linear movement of the adjustable block. This design allows users to adjust the position of the adjustable block, moving it closer to or further away from the base plate, based on the screen window's tapering degree. Attached Figure Description

[0021] Figure 1 This is a three-dimensional view of the adjustable lock seat structure when the adjusting block is in contact with the base plate.

[0022] Figure 2 This is a three-dimensional view of the adjustable lock seat structure when the adjusting block is not in contact with the base plate after adjustment.

[0023] Figure 3 This is an exploded view of the adjustable lock seat structure.

[0024] Figure 4 This is a three-dimensional structural diagram of the adjustable lock base.

[0025] Figure 5 A schematic diagram showing the relationship between the adjustable lock seat structure and the screen window when the adjustable lock seat structure is located on the window frame and the adjusting block is attached to the base plate.

[0026] Figure 6 This is a schematic diagram showing the relationship between the adjustable lock seat structure and the screen window when the adjustable lock seat structure is located on the window frame and the adjusting block is not attached to the base plate.

[0027] Explanation of main component symbols

[0028] 100. Adjustable lock seat structure; 1. Base plate; 11. Protrusion; 12. Bending part; 2. Adjusting block; 21. Threaded hole; 3. Screw structure; 31. Rivet shaft; 32. Rivet; 4. Washer; 5. Mechanized screw; 6. Screen window; 7. Window frame. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] Embodiments of this application provide an adjustable locking seat structure for accommodating the tapering of screen windows, comprising:

[0032] Base plate, used for fixing to the window frame;

[0033] An adjusting block is provided, equipped with a lead screw structure. One end of the lead screw structure is rotatably connected to the base plate, and the other end is drively connected to the adjusting block. The lead screw structure is used to drive the adjusting block closer to or further away from the base plate along the tapering direction of the screen window relative to the base plate. A door or window is also provided, in which the adjustable lock seat structure and the door or window described above are designed with a base plate as the foundation of the lock seat structure, providing a stable support platform. The adjusting block is a key component designed to solve the problem of screen window tapering. The adjusting block can adjust its position according to the tapering of the screen window, ensuring that the effective mounting length of the lock rod is not affected. The lead screw structure is a commonly used transmission mechanism; rotating the lead screw enables linear movement of the adjusting block. This design allows users to adjust the position of the adjusting block closer to or further away from the base plate by rotating the lead screw according to the tapering degree of the screen window.

[0034] 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.

[0035] Please see Figures 1-6 The embodiments of this application provide an adjustable locking seat structure 100 for coping with the waist reduction of the screen window 6. It includes a base plate 1 and an adjusting block 2. The base plate 1 is provided with a lead screw structure 3, which is connected to the adjusting block 2 in a transmission manner. The lead screw structure 3 drives the adjusting block 2 to move closer to or away from the base plate 1 along the waist reduction direction of the screen window 6 relative to the base plate 1.

[0036] Specifically, the locking seat structure is adjustable and designed to address the issue of screen window 6 tapering. By adjusting the locking seat structure, it ensures that screen window 6 maintains a stable locked state when tapering, preventing locking failure due to screen window 6 deformation. The locking seat structure consists of a base plate 1 and an adjusting block 2. The base plate 1 serves as a fixed foundation, while the adjusting block 2 is used to adjust according to the tapering of screen window 6. A lead screw structure 3 is mounted on the base plate 1. The lead screw structure 3 acts as a transmission mechanism, driving the movement of the adjusting block 2. The lead screw structure 3 and the adjusting block 2 are linked through a transmission connection. When the lead screw structure 3 moves, it can drive the adjusting block 2 to move in a specific direction. The lead screw structure 3 can drive the adjusting block 2 to move along the tapering direction of screen window 6. When screen window 6 tapes, adjusting the lead screw structure 3 causes the adjusting block 2 to move in the tapering direction of screen window 6, thereby compensating for the deformation of screen window 6.

[0037] Furthermore, the lead screw connection, as an important transmission method in mechanical structures, mainly consists of a lead screw (or screw rod) and a corresponding nut (in this application, the nut is an adjusting block 2). This structure converts the rotational motion of the lead screw into the linear motion of the nut, or conversely, drives the rotation of the lead screw through the movement of the nut. The working principle of the lead screw structure 3 is based on the principle of screw drive. The surface of the lead screw is usually machined with precision threads, which engage with the internal threads of the nut (in this application, the internal threads are on the hole of the adjusting block). When the lead screw is rotated by an external force, the nut will move linearly along the axis of the lead screw due to the interaction between the threads. This motion can be continuous or intermittent, depending on the rotation mode and speed of the lead screw.

[0038] In a specific example, the lead screw structure 3 includes:

[0039] Rivet shaft 31 is located on base plate 1. Adjustment block 2 is slidably connected to rivet shaft 31. The length direction of rivet shaft 31 is parallel to the waist-tightening direction of screen window 6 relative to base plate 1.

[0040] Rivet 32 ​​is rotatably connected to base plate 1. Rivet 32 ​​is threadedly connected to adjusting block 2. The length direction of rivet 32 ​​is parallel to the length direction of rivet shaft 31.

[0041] Specifically, the rivet shaft 31 is mounted on the base plate 1, serving as a guide rail for the movement of the adjusting block 2. A sliding connection is used between the adjusting block 2 and the rivet shaft 31. This means that the adjusting block 2 can slide freely along the length of the rivet shaft 31, but is limited by the size and shape of the rivet shaft 31, ensuring that the movement trajectory of the adjusting block 2 is straight and stable. The length direction of the rivet shaft 31 is parallel to the waist-reduction direction of the screen window 6 relative to the base plate 1. This design ensures that when the screen window 6 waists up, the adjusting block 2 can move along the waist-reduction direction of the screen window 6, thereby compensating for the deformation of the screen window 6. The rivet 32 ​​is rotatably connected to the base plate 1. This typically means that one or both ends of the rivet 32 ​​are connected to the base plate 1 via bearings, bushings, or other devices, allowing the rivet 32 ​​to rotate freely on the base plate 1. A threaded connection is used between the rivet 32 ​​and the adjusting block 2. This connection method allows the adjusting block 2 to move along the length of the rivet 32 ​​(i.e., the length of the rivet shaft 31) when the rivet 32 ​​rotates, while the tapering direction of the screen 6 relative to the base plate 1 is parallel to the length of the rivet 32. Due to the precision of the thread, this movement is usually continuous and controllable. The length of the rivet 32 ​​is also parallel to the length of the rivet shaft 31. This design ensures that the rotation of the rivet 32 ​​drives the adjusting block 2 to move along the tapering direction of the screen 6, complementing the function of the rivet shaft 31. When the screen 6 tapes, the user can adjust the position of the adjusting block 2 by rotating the rivet 32. Because the rivet 32 ​​and the adjusting block 2 are connected by a thread, rotating the rivet 32 ​​causes the adjusting block 2 to move along the length of the rivet 32 ​​(i.e., the rivet shaft 31). This movement is continuous, and the distance and direction of the adjusting block 2's movement can be controlled by the number and direction of rotation of the rivet 32. Rivet 32 ​​serves as the screw in lead screw structure 3, rivet 31 serves as the guide post in lead screw structure, and adjusting block 2 serves as the nut structure in lead screw connection. Together, the three form a complete lead screw connection.

[0042] In one specific example, a washer 4 is fitted on the rivet 32, and the washer 4 is in contact with the side of the base plate 1 that is away from the adjusting block 2.

[0043] Specifically, the washer 4 is directly fitted onto the rivet 32, located at the point where the rivet 32 ​​contacts the base plate 1. The other side of the washer 4 is tightly fitted against the side of the base plate 1 opposite to the adjusting block 2. This means that the washer 4 is located between the rivet 32 ​​and the base plate 1, acting as an intermediate layer. The washer 4 is typically made of wear-resistant and corrosion-resistant materials, such as stainless steel or copper. These materials have good frictional properties, reducing wear between the rivet 32 ​​and the base plate 1. The smooth surface of the washer 4 reduces frictional resistance during the rotation of the rivet 32, making the transmission smoother.

[0044] In a specific example, the base plate 1 is provided with a plurality of grommets 5, which are symmetrically distributed on both sides of the adjusting block 2. The base plate 1 is fixed to the window frame 7 by the grommets 5.

[0045] Specifically, the base plate 1, serving as the main support and fixing structure, has pre-drilled mounting holes or threaded holes 21 for installing and fixing multiple nut screws 5. On the base plate 1, the multiple nut screws 5 are symmetrically distributed on both sides of the adjusting block 2. This symmetrical distribution helps balance the force on the base plate 1, preventing deformation or loosening due to uneven force. Simultaneously, it ensures the stability and accuracy of the adjusting block 2 during movement or adjustment. The adjusting block 2 is typically a key component of the adjustable lock seat structure 100, used to realize the opening, closing, or locking functions of the window. The nut screws 5 are bolted to the corresponding holes or threaded holes 21 on the window frame 7 via their threaded portions. This connection method usually requires the use of auxiliary components such as nuts or washers 4 to ensure the firmness and stability of the connection. During the connection process, the nut screw 5, also known as a headless screw, set screw, or top screw, is a type of screw without a hole; its threads are machine threads, shaped like rice grains, hence the name. The design principle of the nut screw 5 lies in utilizing the self-locking property of the thread to achieve fixation. Both the head and tail of the screw are threaded. When the screw is rotated, the threads tightly engage with the threaded holes or threaded surfaces on the fixed object, creating a self-locking effect. This design makes the screw less prone to loosening after fixing, making it ideal for scenarios requiring stable connections. In this application, a suitable screw 5 specification is selected based on the material and thickness of the base plate 1 and the window frame 6, as well as the required fixing strength. Ensure that the screw's length, diameter, and thread type match the installation requirements. Pre-drill holes on the base plate 1 to match the screw 5, ensuring these holes are symmetrically distributed on both sides of the adjusting block 2. Simultaneously, mark the corresponding fixing points on the window frame 7. Align the screw shank of the screw 5 with the holes on the base plate 1. Then, use a screwdriver or electric screwdriver to screw the screw into the hole until the appropriate tightness is achieved. During tightening, ensure the screw is evenly stressed to avoid over-tightening, which could damage the threads or deform the base plate. The screw 5 can be an M5x10 internal hex screw, where M5x10 is the specific specification of the screw 5. In this designation, "M5" indicates that the nominal diameter of the bolt is 5 mm, meaning the outer diameter of the threaded portion is 5 mm. This is one of the main dimensional characteristics of the bolt, determining the fit between the bolt and the nut or threaded hole. "x10" indicates that the total length of the bolt is 10 mm, the distance from the head to the end of the bolt. This specification information is crucial for selecting the appropriate bolt, ensuring assembly accuracy, and meeting mechanical performance requirements. Hex socket head cap screws are a commonly used fastener, characterized by a hexagonal notch on the head that allows for tightening or loosening using tools such as hex wrenches or screwdrivers. This design makes the bolt less prone to loosening due to vibration or external forces after tightening, improving the stability and reliability of the connection.The internal hex design allows for easy tightening and loosening using tools such as wrenches or screwdrivers. Compared to other types of bolts (such as external hex bolts), internal hex socket head cap screws prevent damage to the bolt head due to wrench slippage during tightening, improving work efficiency and ease of operation. After tightening, the special head design of internal hex socket head cap screws makes them less prone to loosening due to vibration or external force, thus ensuring the stability and safety of the connection.

[0046] In a specific example, the adjusting block 2 has a threaded hole 21 that passes through the adjusting block 2, and the rivet 32 ​​is bolted to the threaded hole 21.

[0047] Specifically, the adjusting block 2, as a key component of the adjustable structure, has a pre-designed and machined threaded hole 21. The threaded hole 21 is a hole with internal threads, used to mate with fasteners with external threads (such as bolts, screws, or rivets 32). The purpose of having the threaded hole 21 on the adjusting block 2 is to provide a reliable connection point so that the adjusting block 2 can be fixed or connected to other components (such as the base plate 1, window frame 7, etc.) by fasteners. The term "through" here means that the threaded hole 21 penetrates from one side of the adjusting block 2 to the other, forming a complete channel. This design allows fasteners to be inserted from one side of the adjusting block 2 and tightened on the other side through threaded engagement, thus achieving a secure connection between the adjusting block 2 and other components. Although the original text uses the term "rivet 32," in this context, it more likely refers to a fastener with external threads, such as a bolt or screw. This fastener mates with its external threads through the internal threaded hole 21 on the adjusting block 2, i.e., a bolted connection. During the connection process, the rivet 32 ​​(or bolt / screw) is screwed into the threaded hole 21, and the tight fit of the threads securely fixes the adjusting block 2 to other components. Bolted connections are a common mechanical connection method, offering advantages such as strong connection, ease of disassembly and reinstallation. In adjustable structures, bolted connections allow for convenient adjustment of the position or angle of the adjusting block 2 to meet different usage requirements. Furthermore, bolted connections facilitate maintenance and replacement operations.

[0048] In one specific example, the base plate 1 has a bent portion 12 on the side away from the adjusting block 2, and a protrusion 11 on the side of the base plate 1 facing the adjusting block 2. The protrusion 11 and the bent portion 12 respectively abut against the mounting groove of the window frame 7.

[0049] Specifically, the bend 12 is located on the side of the base plate 1 away from the adjusting block 2. The bend 12 is typically a metal or plastic sheet bent towards the window frame 7. This design not only increases the strength of the base plate 1 but also allows it to better fit the mounting groove of the window frame 7. The main function of the bend 12 is to provide additional support and fixing points, ensuring that the base plate 1 is more stable within the mounting groove. When the base plate 1 is fixed to the window frame 7 with mortise screws 5 or other fasteners, the bend 12 prevents the base plate 1 from sliding or falling off during installation, thereby improving the reliability and stability of the installation. The protrusion 11 is located on the side of the base plate 1 facing the adjusting block 2 (or adjusting block 2, but more likely refers to the area near the mounting position of adjusting block 2). The protrusion 11 is typically a small metal or plastic protrusion, the shape and size of which depend on the design of the mounting groove of the window frame 7. The protrusion 11 is designed to match specific parts of the mounting groove of the window frame 7 to achieve a tighter fit and higher installation accuracy. The main function of the protrusion 11 is to ensure that the base plate 1 is correctly positioned within the mounting groove of the window frame 7 during installation. By tightly fitting into the mounting groove, the protrusion 11 prevents the base plate 1 from shifting or tilting during installation, thus ensuring the accuracy and stability of the lock seat structure. When installing the adjustable lock seat structure 100, the base plate 1 is first placed within the mounting groove of the window frame 7. At this time, the bent portion 12 and the protrusion 11 will contact different parts of the mounting groove. The base plate 1 is then firmly fixed to the window frame 7 by rotating the nut screw 5 or other fasteners. During the fixing process, the bent portion 12 and the protrusion 11 play a crucial supporting and positioning role, ensuring the correct position and stability of the base plate 1 within the mounting groove. Once the base plate 1 is fixed in place, the protrusion 11 and the bent portion 12 will form a tight fit with the mounting groove of the window frame 7, thus preventing the base plate 1 from moving or deforming during installation. This design not only improves the reliability and stability of the installation but also allows the lock seat structure to better adapt to the installation requirements of different window frames 7.

[0050] Embodiments of this application provide a door or window, including the aforementioned adjustable lock seat structure 100.

[0051] Specifically, "door or window" here is used in a broad sense, referring to various types of doors (such as entrance doors, bedroom doors, balcony doors, etc.) or windows (such as casement windows, sliding windows, awning windows, etc.). Crucially, these doors and windows are designed with the adjustable lock seat structure 100 in mind. As mentioned earlier, the adjustable lock seat structure 100 primarily addresses the potential for the screen window 6 (or the door / window itself) to narrow. By adjusting the position of the lock seat, effective cooperation between the lock seat and the locking rod (or the corresponding locking mechanism) can be ensured, thereby improving the reliability and tightness of the locking mechanism. This adjustable lock seat structure 100 also functions in doors and windows. For example, under long-term use or the influence of external environmental factors, the frame of the door or window may undergo slight deformation. In this case, the adjustable lock seat structure 100 can adjust according to the deformation, ensuring that the locking effect of the door or window is not affected.

[0052] The above are merely embodiments 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. An adjustable locking seat structure for accommodating the tapering of window screens, characterized in that, include: Base plate, used for fixing to the window frame; An adjusting block is provided with a lead screw structure. One end of the lead screw structure is rotatably connected to the base plate, and the other end is drively connected to the adjusting block. The lead screw structure is used to drive the adjusting block to move closer to or away from the base plate along the waist-slimming direction of the screen relative to the base plate.

2. The adjustable lock seat structure according to claim 1, characterized in that, The lead screw structure includes: A rivet shaft is provided on the base plate, and the adjusting block is slidably connected to the rivet shaft. The length direction of the rivet shaft is parallel to the waist-slimming direction of the screen window relative to the base plate.

3. The adjustable lock seat structure according to claim 1, characterized in that, The lead screw structure also includes: A rivet is rotatably connected to the base plate. The rivet is threadedly connected to the adjusting block. The length direction of the rivet is parallel to the tapering direction of the screen relative to the base plate.

4. The adjustable lock seat structure according to claim 3, characterized in that, A washer is fitted onto the rivet, and the washer is in contact with the side of the base plate opposite to the adjusting block.

5. The adjustable lock seat structure according to claim 1, characterized in that, The base plate is provided with at least one mortise screw, and the base plate is fixed to the window frame by the mortise screw.

6. The adjustable lock seat structure according to claim 5, characterized in that, The number of the nut screws is two, and they are symmetrically distributed on both sides of the adjusting block.

7. The adjustable lock seat structure according to claim 3, characterized in that, The adjusting block has a threaded hole that passes through it, and the rivet is threadedly connected to the threaded hole.

8. The adjustable lock seat structure according to claim 2, characterized in that, The base plate has a bent portion on the side away from the adjusting block, and a protrusion on the side of the base plate facing the adjusting block. The protrusion and the bent portion respectively abut against the mounting groove of the window frame.

9. A door or window, characterized in that, Includes the adjustable locking seat structure as described in any one of claims 1-8.