A push-pull in-swinging window opening and closing system

Abstract

A push-pull inner reverse window opening and closing system, comprising a window frame and a window sash, the bottom frame of the window frame is slidably connected with a first sliding mechanism and a second sliding mechanism on the outside, and a pusher is fixedly connected on the inside, the first sliding mechanism comprises a sliding piece, a supporting arm and a movable lock block, the upper part of the sliding piece is provided with a first protruding part and a second protruding part above the pulleys at both ends respectively, the area between the two protruding parts is a working part, a first groove is formed above the first protruding part, and the movable lock block is rotatably connected in the first groove, the working part is rotatably connected with the supporting arm at one end close to the first protruding part, the supporting arm is provided with a second groove at one end close to the first protruding part, and the movable lock block rotates to two limit positions in the groove, corresponding to the opening state and the closed state respectively, the above design is an integral technical scheme and cannot be omitted, through the innovative design, the structure is simplified, the window opening positioning and the window closing positioning are increased, and the window damage caused by the absence of the positioning mechanism is eliminated.

Description

Technical Field

[0001] This invention relates to the field of sliding window technology, specifically to a sliding tilt-and-turn window opening and closing system. Background Technology

[0002] Sliding tilt-and-turn windows are increasingly popular due to their ability to open inwards or slide horizontally, allowing users to switch between the two opening methods at will. When closed, the window sash is flush with the glass, creating a neat and uniform facade. When open, the sash can be pulled out with slight force and slid horizontally along the bottom edge, saving space. Locking tabs are typically located on both sides of the inner side of the window frame corresponding to the movable sash. Turning the handle aligns these tabs with the window sash, locking it in place and providing excellent security.

[0003] Most current sliding tilt-and-turn windows use a combination of cam mechanism and spring to connect the bottom of the window sash to the bottom frame. When closing, the stop at the end of the bottom frame pushes the cam mechanism to rotate. Under the action of the spring, the window sash will quickly tilt and hit the inside of the window frame, especially causing a large impact on the vertical support in the middle of the window frame that separates the window sash from the glass sash.

[0004] When it needs to be opened, traditional opening and closing mechanisms lack locking mechanisms. This can lead to a situation where the window sash is pulled outwards while simultaneously being pushed horizontally towards the glass sash. At this time, the two locking plates have not yet separated. The sliding window sash usually has a very small clearance for turning outwards. When pulled manually, it can only be forcibly separated, which will inevitably cause an impact. Over time, this can easily lead to deformation and affect its use.

[0005] In addition, when closing the window, due to the lack of a lock, if the window is pressed down manually before reaching the end point, the window sash will move inward, causing the locking point to hit the window.

[0006] In addition, the existing opening and closing mechanisms are not interchangeable between the front and rear components, and their complex structure results in high costs.

[0007] Therefore, in response to the problem that existing sliding tilt-and-turn windows are prone to damage when in the open / closed state due to the lack of an effective positioning mechanism, the applicant has innovatively designed a new type of sliding tilt-and-turn window opening and closing system. Summary of the Invention

[0008] To address the technical problems existing in the background art, the present invention provides a sliding inward tilt-and-turn window opening and closing system.

[0009] The technical solution of this invention is as follows:

[0010] A sliding tilt-and-turn window opening and closing system includes a window frame and a window sash. A first sliding mechanism and a second sliding mechanism are slidably connected to the outer side of the bottom edge of the window frame, and a toggle member is fixedly connected to the inner side. The first sliding mechanism and the second sliding mechanism are connected to the bottom end of the window sash.

[0011] The first sliding mechanism includes a slider, a support arm, and a movable locking block;

[0012] The bottom of the slider is provided with pulleys at both ends, and the upper part is provided with a first protrusion and a second protrusion above the pulleys at both ends, and the area between the two protrusions is the working part;

[0013] The first protrusion is located near the end of the second sliding mechanism, and a first groove is opened above it. The top of the first groove and the side facing the second protrusion are connected through it. A movable locking block is rotatably connected in the first groove. The top of the movable locking block is provided with a socket for the plug on the outward side of the toggle member to be inserted. The end of the movable locking block facing the second protrusion can be rotated to the bottom of the toggle member when the toggle member is turned.

[0014] The working part is rotatably connected to a support arm at one end near the first protrusion. The support arm is provided with a second groove at one end near the first protrusion, and rotatably connected to the bottom end of the window sash at the other end away from the first protrusion.

[0015] The two extreme positions of the movable locking block within the groove correspond to the open and closed states, respectively.

[0016] When open, the window sash pulls the support arm to rotate out of a preset angle, the second groove aligns with the first groove, and the window sash is pushed to move. The toggle piece can move the movable lock block to the lower limit position and enter the second groove.

[0017] In the closed state, the window sash is pulled back to the closed position, and the end of the movable locking block away from the second protrusion abuts against the actuating element. The actuating element moves the movable locking block out of the second groove to the upper limit position, and the support arm continues to rotate to close the window sash.

[0018] The second groove on the support arm is positioned to align with the first groove when the window sash is pulled and rotated out of a preset angle. The design of the support arm, the first groove of the sliding component, and its internal movable locking block, along with the design of the actuating component, form a complete technical solution, none of which can be omitted. This innovative design overturns the traditional hard reversing method of cam and spring. Whether in the open or closed state, the window can only be moved after the support arm has rotated to the correct position and the actuating block has moved the movable locking block to reverse the direction. This eliminates the possibility of window damage caused by prematurely pulling or pressing the window sash due to the lack of a positioning mechanism.

[0019] As a preferred embodiment, the sliding component has a long strip structure with a groove along its length at the bottom, and the working part near the first protrusion is flat. The two sides can be designed as flat structures for easy retraction into the window sash.

[0020] The support arm consists of a rotating part and a connecting part;

[0021] The width of the rotating part is greater than the width of the working part, and it is horizontally connected to the working part by a pin. Its height is lower than the height of the first protrusion.

[0022] The connecting part is connected to the rear outer side of the rotating part, and the height of its end is higher than the height of the connection point with the rotating part. When the window sash is closed, the connecting part is located outside the second protrusion.

[0023] The bottom surface of the rotating part is provided with two sets of limiting grooves, namely the first limiting groove group and the second limiting groove group. Each set of limiting grooves includes two slots symmetrically arranged about the rotation center of the rotating part.

[0024] The working part has two top balls along its length, which are symmetrical about the rotation center of the rotating part. A spring is provided below the top balls.

[0025] The vertical plane where the second limiting groove group is located is parallel to the vertical plane where the second groove is located, and the included angle formed by the vertical connecting lines of the two limiting groove groups is the same as the preset angle of the window sash.

[0026] The combination of the limiting groove group and the top ball can accurately lock the open and closed states of the window sash, making operation convenient.

[0027] The first groove has a vertical side and an inclined side along the length of the slider. The vertical side is located at the innermost side, and the height of the inclined side is higher than the working part and lower than the height of the end of the support arm near the first protrusion. The junction of the vertical side and the inclined side is a rounded transition.

[0028] The lower part of the movable locking block is a right-angled triangle with the hypotenuse at the bottom. It is rotatably connected to the first groove by a pin at the bottom. One right-angled side can coincide with the vertical side in the first groove. The other right-angled side has protrusions at both ends above it, and the two protrusions form a socket.

[0029] As a preferred embodiment, when the window is closed, the height of the beveled end of the movable locking block is flush with the height of the rotating part. The support arm sweeps across the opening area of ​​the first groove in a gradually changing arc, with its center coinciding with the rotation center line of the support arm. The height increases progressively from the top of the second groove to the arc-shaped end. When the window is opened, as the support arm rotates, the beveled end of the movable locking block gradually slides into the first groove along the gradual change, ensuring a smooth transition and preventing interference problems caused by sudden changes.

[0030] The toggle element includes:

[0031] Mounting bracket, attached to the bottom edge;

[0032] The plug extends outwards from the mounting base;

[0033] The sheath is fitted over the end of the plug, and the total width of the plug and the sheath matches the width of the socket.

[0034] The second sliding mechanism does not have a movable locking block, and the rest of the structure is the same as the first sliding mechanism. There is no need to open a separate mold. The front and rear sliding mechanisms have the same structure, and only one of them needs to be equipped with a movable locking block, which reduces costs and avoids increasing inventory.

[0035] The first sliding mechanism has a fixing part at the outer end of the first protrusion and the second protrusion, and the fixing parts at opposite ends of the two sliding mechanisms are connected to a middle connecting rod, and a block is installed on the fixing part at the other end.

[0036] This invention relates to a push-pull tilt-and-turn window opening and closing system. The second groove of the support arm is positioned so that it aligns with the first groove when the window sash is pulled and rotated out of a preset angle. The design of the support arm, the first groove of the sliding component, and its internal movable locking block, along with the design of the actuating component, form an integrated technical solution, none of which can be omitted. This innovative design not only simplifies the structure but also adds window opening and closing positioning, overturning the traditional hard reversing method of cam and spring. Whether in the open or closed state, the system must wait for the support arm to rotate to the correct position and for the actuating block to move the movable locking block before execution. This eliminates window damage caused by prematurely pulling or pressing the window sash due to the lack of a positioning mechanism. Attached Figure Description

[0037] In the attached diagram:

[0038] Figure 1 A diagram showing the closed state of a tilt-and-turn window;

[0039] Figure 2 for Figure 1 A diagram showing what's behind the hidden window sash;

[0040] Figure 3 A diagram showing the state when the window is open;

[0041] Figure 4 for Figure 2 A magnified view of the Z-position in the middle;

[0042] Figure 5 for Figure 3 A magnified view of the Y-position in the middle;

[0043] Figure 6 This is a top view of the two sliding mechanisms;

[0044] Figure 7 This is a front view of the first sliding mechanism;

[0045] Figure 8 This is a cross-sectional view of the first sliding mechanism;

[0046] Figure 9 This is a diagram showing the open state of the first sliding mechanism;

[0047] Figure 10 This is a 3D view of the sliding component;

[0048] Figure 11 This is a front view of the support arm;

[0049] Figure 12 This is a reverse view of the support arm;

[0050] Figure 13 This is a front view of the toggle switch.

[0051] Figure 14 This is a reverse view of the toggle switch;

[0052] The components represented by the various reference numerals in the diagram are:

[0053] 1. Window frame; 11. Vertical brace; 111. Stop block; 12. Bottom frame; 2. Window sash; 3. First sliding mechanism; 31. Sliding component; 311. Fixing part; 312. First protrusion; 3121. First groove; 313. Second protrusion; 314. Working part; 3141. Top bead; 3142. Spring; 315. Pulley; 32. Support arm; 321. Rotating part; 3211. Gradient section; 3212. Second groove; 3213. First limiting groove group; 3214. Second limiting groove group; 322. Connecting part; 33. Movable locking block; 331. Socket; 4. Second sliding mechanism; 5. Actuating component; 51. Plug; 52. Mounting base; 53. Protective sleeve. Detailed Implementation

[0054] See Figures 1-5 A sliding tilt-and-turn window opening and closing system includes a window frame 1 and a window sash 2. The window frame 1 is provided with a vertical brace 11 to separate the movable window sash 2 from the fixed glass sash. A stop block 111 is provided on the vertical brace for locking the window sash 2. In this embodiment, the direction of the movable window sash 2 when it is opened is defined as the outward movement direction, that is, the movable window sash 2 is pulled outward and slid.

[0055] A raised track is provided along the length direction on the outer side of the bottom frame 12 of the window frame 1, on which a first sliding mechanism 3 and a second sliding mechanism 4 are slidably connected. A toggle member 5 is fixedly connected on the inner side, and the height of the toggle member 5 is higher than the height of the track. The first sliding mechanism 3 and the second sliding mechanism 4 are connected to the bottom end of the window sash 2. According to Figure 4 and Figure 5 As can be seen, the left side is the second sliding mechanism 4, and the right side is the first sliding mechanism 3.

[0056] The following is combined Figures 6-9 The first sliding mechanism 3 is introduced, which specifically includes a slider 31, a support arm 32, and a movable locking block 33.

[0057] The bottom of the sliding member 31 is provided with pulleys 315 at both ends, and a first protrusion 312 and a second protrusion 313 are respectively provided above the pulleys 315 at both ends on the upper part. The area between the two protrusions is the working part 314, and a fixing part 311 is provided on the outside of the first protrusion 312 and the second protrusion 313 respectively.

[0058] The first protrusion 312 is located near one end of the second sliding mechanism 4, and a first groove 3121 is formed above it. The top of the first groove 3121 and the side facing the second protrusion 313 are connected through it. A movable locking block 33 is rotatably connected in the first groove 3121. The top of the movable locking block 33 is provided with a socket 331 for the plug 51 on the outward side of the toggle member 5 to be inserted. The end of the movable locking block 33 facing the second protrusion 313 can be rotated to below the toggle member 5 when toggled by the toggle member 5. The end of the movable locking block 33 away from the second protrusion 313 can abut against the inner wall of the first groove 3121 when toggled by the toggle member 5.

[0059] The working part 314 is rotatably connected to a support arm 32 at one end near the first protrusion 312. The support arm 32 is provided with a second groove 3212 at one end near the first protrusion 312, and the other end away from the first protrusion 312 is rotatably connected to the bottom end of the window sash 2.

[0060] The two extreme positions of the movable locking block 33 within the groove correspond to the open and closed states, respectively.

[0061] In the open state, when the window sash 2 is pulled, the support arm 32 rotates to a preset angle, the second groove 3212 aligns with the first groove 3121, and the window sash 2 is pushed to move. The actuating element 5 can move the movable locking block 33 to the lower limit position, entering the second groove 3212. (See below) Figure 9 As shown.

[0062] In the closed state, window sash 2 is pulled back to the closed position. The end of movable locking block 33 away from the second protrusion 313 abuts against the actuating member 5. The actuating member 5 moves movable locking block 33 out of the second groove 3212 to the upper limit position. The support arm 32 continues to rotate, closing window sash 2. (See below) Figure 6 As shown.

[0063] The second groove 3212 of the support arm 32 is positioned to align with the first groove 3121 when the window sash 2 is pulled and rotated to a preset angle. The design of the support arm 32, the first groove 3121 of the sliding member 31 and its internal movable locking block 33, together with the design of the actuating member 5, form an integrated technical solution, none of which can be omitted. This innovative design overturns the traditional hard reversing method of cam plus spring 3142. Whether in the open or closed state, the operation can only be performed after the support arm 32 has rotated to the correct position and the actuating block has moved the movable locking block 33 to reverse the direction. This eliminates the possibility of window damage caused by prematurely pulling or pressing the window sash 2 due to the lack of a positioning mechanism.

[0064] The following is combined Figures 10-14 Let's introduce the specific structure of the sliding mechanism.

[0065] See Figure 10 In this embodiment, the sliding member 31 has a long strip structure with a groove along its length at the bottom, and the working part 314 is flat near the first protrusion 312. The two sides can be designed as flat structures to facilitate folding into the window sash 2.

[0066] The length of the first protrusion 312 is greater than the length of the second protrusion 313, which facilitates the opening of the first groove 3121.

[0067] The width of the working part 314 near the first protrusion 312 is greater than that of the part away from the first protrusion 312. This position is where the support arm is connected, and it is subject to greater force, so it needs to be made appropriately wider.

[0068] The support arm 32 is divided into a rotating part 321 and a connecting part 322.

[0069] The width of the rotating part is greater than the width of the working part 314, and it is horizontally connected to the working part 314 by a pin. Its height is lower than the height of the first protrusion 312.

[0070] The connecting part 322 is connected to the rear outer side of the rotating part, and the height of its end is higher than the height of the connection with the rotating part. When the window sash 2 is closed, the connecting part 322 is located outside the second protrusion 313 and is arranged parallel to the sliding member 31.

[0071] Because the support arm 32 supports the entire window sash 2 and is subjected to considerable force, and the special structure of the sliding member 31 means that the length of the working part 314 cannot be too long. If the length of the support arm 32 is the same as the length of the working part 314, the window sash 2 cannot be completely rotated out of the window frame 1. Moreover, if the entire support arm 32 is thickened to increase strength, once it exceeds the first protrusion 312, it will also hinder the rotation of the movable locking block 33. Furthermore, the height of the first protrusion 312 is limited by the width of the lower frame of the window sash and cannot be increased indefinitely.

[0072] To solve this chain problem, the present invention designs the support arm 32 as two parts. The rotating part 321 is large and flat, with a width greater than the working part 314 and a height lower than the first protrusion 312 to meet the strength requirements. The connecting part 322 is narrow and thick, with a thickness greater than the rotating part 321, and is located outside the second protrusion 313 when the window sash 2 is closed. Thus, the shape of the support arm 32 can meet both the functional requirements of the sliding mechanism and the support strength requirements.

[0073] To ensure smooth state switching, the bottom surface of the rotating part 321 is provided with two sets of limiting grooves, namely the first limiting groove group 3213 and the second limiting groove group 3214. Each limiting groove group includes two slots symmetrically arranged about the rotation center of the rotating part.

[0074] The working part 314 has two top balls 3141 arranged along its length. The two top balls 3141 are symmetrically arranged about the rotation center of the rotating part. A spring 3142 is provided below the top balls 3141, so that the top balls 3141 will not detach from the working part 314.

[0075] The vertical plane of the second limiting groove group 3214 is parallel to the vertical plane of the second groove 3212, and the included angle formed by the vertical connecting lines of the two limiting groove groups is the same as the preset angle of the window sash 2.

[0076] With the cooperation of the limiting groove group and the top bead 3141, the open and closed states of the window sash 2 can be precisely locked, making operation convenient.

[0077] See Figure 8 The first groove 3121 has a vertical side and an inclined side in the length direction of the slider 31. The vertical side is located at the innermost side, and the height of the inclined side is higher than that of the working part 314 and lower than that of the end of the support arm 32 near the first protrusion 312. The connection between the vertical side and the inclined side is a rounded transition.

[0078] As a preferred embodiment, the height of the inclined side is less than half the height of the front rotating part 321 of the support arm 32, so that the movable locking block 33 has more contact area with the second groove 3212 and the strength is improved.

[0079] The lower part of the movable locking block 33 is a right-angled triangle with the hypotenuse at the bottom. It is rotatably connected to the first groove 3121 via a pin at the bottom. One right-angled side can coincide with the vertical side in the first groove 3121, and the other right-angled side has protrusions extending from both ends above it, forming a socket 331 between the two protrusions. The height of the protrusion is lower than the height of the plug 51 of the toggle member 5, and the height of the contact surface with the plug 51 is greater than 1 / 2 of the height of the protrusion, ensuring that the two have sufficient contact area.

[0080] As a preferred embodiment, when the window sash 2 is closed, the height of the inclined end of the movable locking block 33 is flush with the height of the rotating part. The support arm 32 sweeps across the opening area of ​​the first groove 3121 in an arc-shaped gradient section 3211, with its center coinciding with the rotation center line of the support arm 32. The height increases progressively from the top of the second groove 3212 to the arc-shaped end. See [reference needed] Figure 11 As shown.

[0081] When the window sash 2 is opened, as the support arm 32 rotates, the end of the inclined side of the movable locking block 33 gradually slides into the first groove 3121 along the transition section 3211, making the transition smooth and preventing interference problems caused by sudden changes.

[0082] See Figure 13 and Figure 14 The toggle element 5 includes:

[0083] Mounting bracket 52 is connected to the bottom frame 12;

[0084] The plug 51 extends outward from the mounting base 52;

[0085] The sheath 53 is fitted onto the end of the plug 51, and the total width of the plug 51 and the sheath 53 matches the width of the socket 331.

[0086] In this embodiment, the second sliding mechanism 4 does not have a movable locking block 33, and the rest of the structure is the same as the first sliding mechanism 3. There is no need to open a separate mold. The front and rear sliding mechanisms have the same structure, and only one of them needs to be equipped with a movable locking block 33, which reduces costs and avoids increasing inventory.

[0087] The first sliding mechanism 3 is provided with a fixing part 311 at the outer end of the first protrusion 312 and the second protrusion 313 respectively. The fixing parts 311 at opposite ends of the two sliding mechanisms are connected to a middle connecting rod, and a block is installed on the fixing part 311 at the other end.

Claims

1. A sliding tilt-and-turn window opening and closing system, comprising a window frame (1) and a window sash (2), characterized in that, The bottom frame (12) of the window frame (1) is slidably connected to a first sliding mechanism (3) and a second sliding mechanism (4) on the outside, and a toggle piece (5) is fixedly connected to the inside. The first sliding mechanism (3) and the second sliding mechanism (4) are connected to the bottom end of the window sash (2). The first sliding mechanism (3) includes a slider (31), a support arm (32), and a movable locking block (33); The sliding member (31) has pulleys (315) at both ends of its bottom, and a first protrusion (312) and a second protrusion (313) are respectively provided above the pulleys (315) at both ends of its upper part. The area between the two protrusions is the working part (314). The first protrusion (312) is located near the end of the second sliding mechanism (4), and a first groove (3121) is opened above it. The top of the first groove (3121) and the side facing the second protrusion (313) are connected through it. A movable locking block (33) is rotatably connected in the first groove (3121). The top of the movable locking block (33) is provided with a socket (331) for the plug (51) of the toggle member (5) to be inserted. The end of the movable locking block (33) facing the second protrusion (313) can be rotated to below the toggle member (5) under the toggle member (5). The working part (314) is rotatably connected to a support arm (32) at one end near the first protrusion (312). The support arm (32) is provided with a second groove (3212) at one end near the first protrusion (312), and the other end away from the first protrusion (312) is rotatably connected to the bottom end of the window sash (2). The two extreme positions of the movable locking block (33) within the first groove correspond to the open state and the closed state, respectively. In the open state, the window sash (2) pulls the support arm (32) to rotate out of the preset angle, the second groove (3212) aligns with the first groove (3121), pushes the window sash (2) to move, and the toggle piece (5) can move the movable lock block (33) to the lower limit position and enter the second groove (3212). In the closed state, the window sash (2) is pulled back to the closed position, the movable locking block (33) is away from the second protrusion (313) and abuts against the actuating member (5), the actuating member (5) moves the movable locking block (33) out of the second groove (3212) to the upper limit position, the support arm (32) continues to rotate, and closes the window sash (2).

2. The sliding inward tilt-and-turn window opening and closing system according to claim 1, characterized in that, The sliding member (31) is a long strip structure with a groove at the bottom along the length direction, and the working part (314) near the first protrusion (312) is a plane.

3. The sliding inward tilt-and-turn window opening and closing system according to claim 1, characterized in that, The support arm (32) is divided into a rotating part (321) and a connecting part (322). The width of the rotating part (321) is greater than the width of the working part (314), and it is horizontally connected to the working part (314) by a pin. Its height is lower than the height of the first protrusion (312). The connecting part (322) is connected to the rear part of the outer side of the rotating part, and the height of the end is higher than the height of the connection with the rotating part. When the window sash (2) is closed, the connecting part (322) is located outside the second protrusion (313).

4. A sliding inward tilt-and-turn window opening and closing system according to claim 3, characterized in that, The bottom surface of the rotating part is provided with two sets of limiting grooves, namely the first limiting groove group (3213) and the second limiting groove group (3214). Each limiting groove group includes two slots symmetrically arranged about the rotation center of the rotating part. The working part (314) is provided with two top beads (3141) along the length direction. The two top beads (3141) are symmetrically arranged about the rotation center of the rotating part. A spring (3142) is provided below the top beads (3141). The vertical plane of the second limiting groove group (3214) is parallel to the vertical plane of the second groove (3212), and the included angle formed by the vertical connecting lines of the two limiting groove groups is the same as the preset angle of the window sash (2).

5. A sliding inward tilt-and-turn window opening and closing system according to claim 4, characterized in that, The support arm (32) sweeps across the opening area of ​​the first groove (3121) in an arc-shaped gradient section (3211), with the center of the circle coinciding with the rotation center line of the support arm (32), and the height increases from the top of the second groove (3212) to the arc end.

6. A sliding inward tilt-and-turn window opening and closing system according to claim 1, characterized in that, The first groove (3121) has a vertical side and an inclined side in the length direction of the slider (31). The vertical side is located at the innermost side, and the height of the inclined side is higher than that of the working part (314) and lower than that of the support arm (32) near the end of the first protrusion (312). The vertical side and the inclined side are connected by a rounded transition.

7. A sliding inward tilt-and-turn window opening and closing system according to claim 6, characterized in that, The lower part of the movable locking block (33) is a right triangle with the hypotenuse at the bottom. It is rotatably connected to the first groove (3121) by a pin at the bottom. One right-angled side can coincide with the vertical side in the first groove (3121). The other right-angled side has protrusions at both ends above it, and a socket (331) is formed between the two protrusions.

8. A sliding inward tilt-and-turn window opening and closing system according to claim 1, characterized in that, The actuating element (5) includes: Mounting bracket (52) is attached to the bottom frame (12); The plug (51) extends outward from the mounting base (52); The sheath (53) is fitted onto the end of the plug (51), and the total width of the plug (51) and the sheath (53) matches the width of the socket (331).

9. A sliding inward tilt-and-turn window opening and closing system according to claim 1, characterized in that, The second sliding mechanism (4) does not have a movable locking block (33), and the rest of the structure is the same as the first sliding mechanism (3).

10. A sliding inward tilt-and-turn window opening and closing system according to claim 9, characterized in that, The first sliding mechanism (3) has a fixing part (311) at the outer end of the first protrusion (312) and the second protrusion (313). The fixing parts (311) at opposite ends of the two sliding mechanisms are connected to a middle connecting rod, and a block is installed on the fixing part (311) at the other end.

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