Limiting mechanism and inward tilt-turn window comprising same

Abstract

The utility model discloses a limiting mechanism and an inward tilt-turn window comprising the same, and the limiting mechanism comprises a sliding part which is used for being in transmission connection with a handle and can be driven by the handle to slide from a first position to a second position and a third position in sequence; the limiting piece is used for being movably arranged on the window body, and the limiting piece can move to the unlocking position from the limiting position when being triggered; when the sliding part slides from the first position to the second position and the limiting part is triggered, the limiting part is located at the unlocking position, and the limiting part is located outside the sliding path of the sliding part so as to allow the sliding part to slide between the second position and the third position. When the sliding part slides to the second position from the first position and the limiting part is not triggered, the limiting part is located at the limiting position, and the limiting part is located in the sliding path of the sliding part to limit the sliding part to slide between the second position and the third position. In this way, the problem that the upper portion of the window body topples over when the window body is flatly opened due to misoperation of the handle can be avoided, and the safety performance of the inward tilt-turn window is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to door and window hardware fitting technical field especially limit position mechanism and including its inside open inside reverse window. BACKGROUND

[0002] The inside open inside reverse window can be operated into three different position states of closing, flat opening and top inside reverse by rotating the handle of the window body to drive the internal hinge device to lock or unlock the connection of the window body and the hinge of the window frame. The hinge device of the inside open inside reverse window and the inside open inside reverse window are disclosed in Chinese patent CN112177469A. The hinge device of the inside open inside reverse window comprises a pull rod mechanism including a connecting seat and a lock rod slidingly connected opposite to the connecting seat; a hinge arranged at a distance from the connecting seat for connecting the window frame and the window body, the side of the lock rod close to the hinge is provided with a first locking part; a link assembly including a main link and an auxiliary link, one end of the main link is slidingly hinged on the connecting seat along the sliding direction of the lock rod, the other end is fixedly connected with the movable leaf of the hinge, the auxiliary link is hinged at both ends with the connecting seat and the main link, and the main link is provided with a second locking part matched with the first locking part; when the first locking part and the second locking part are locked, the link assembly, the pull rod mechanism and the movable leaf of the hinge can be synchronously swung relative to the fixed leaf of the hinge, when the lock rod slides to make the first locking part disengage from the second locking part, the pull rod mechanism can swing relative to the link assembly; the end of the lock rod close to the hinge is provided with a lock pin part, the other end of the movable leaf and / or the main link is provided with a lock hole, the lock pin part is inserted into the lock hole when the first locking part and the second locking part are locked, and the lock pin part disengages from the lock hole when the first locking part disengages from the second locking part.

[0003] However, if the handle is moved to the position that makes the window switch to the inside reverse state due to misoperation of the handle when the window body is in the flat opening state, the upper part of the window body will also be tilted while being flat opened, which exists a safety hazard. UTILITY MODEL CONTENTS

[0004] In order to overcome at least one of the defects of the prior art described above, the utility model provides a limiting mechanism and an inside open inside reverse window comprising the same, which can prevent the upper part of the window body from tilting due to misoperation of the handle when the window body is in the flat opening state.

[0005] The utility model employs the technical scheme that:

[0006] The limiting mechanism for the inward opening and inward tilting window comprises a sliding member connected with a handle for transmission, which can slide from a first position to a second position and a third position under the drive of the handle; a limiting member movably arranged on the window body, which can move from a limiting position to an unlocking position when triggered; when the sliding member slides from the first position to the second position and the limiting member is triggered, the limiting member is in the unlocking position and is located outside the sliding path of the sliding member to allow the sliding member to slide between the second position and the third position; when the sliding member slides from the first position to the second position and the limiting member is not triggered, the limiting member is in the limiting position and is located in the sliding path of the sliding member to limit the sliding member to slide between the second position and the third position.

[0007] According to some embodiments of the present application, the limiting mechanism further comprises an elastic reset member configured to reset the limiting member from the unlocking position to the limiting position by elastic force; when the sliding member is in the second position or the third position and the limiting member is not triggered, the limiting member is reset to the limiting position and is located in the sliding path of the sliding member to limit the sliding member to slide between the second position and the third position.

[0008] According to some embodiments of the present application, the sliding member is provided with a protruding rib, the protruding rib and the sliding member slide synchronously, and the limiting member is provided with a limiting block; when the sliding member is in the second position and the limiting member is not triggered, a first end of the protruding rib abuts against a first side of the limiting block; when the sliding member is in the third position and the limiting member is not triggered, a second end of the protruding rib abuts against a second side of the limiting block.

[0009] According to some embodiments of the present application, the first side of the limiting block is provided with an arc-shaped groove, and a first end of the protruding rib is provided with an arc-shaped protrusion matched with the arc-shaped groove; when the sliding member is in the second position and the limiting member is not triggered, the arc-shaped protrusion abuts against the arc-shaped groove.

[0010] According to some embodiments of the present application, a first end of the limiting member is provided with a rotating shaft, and a second end of the limiting member is rotatably arranged around the rotating shaft; the elastic reset member acts on the rotating shaft by elastic force.

[0011] According to some embodiments of the present application, the elastic reset member is a torsion spring, and the torsion spring is sleeved on the rotating shaft.

[0012] In addition, the utility model still provides a kind of inside opening and inside tilting window, including the limiting mechanism as described above, still including handle, hinge mechanism, window frame, window body and knob piece;The hinge mechanism is connected between the window frame and the window body, the knob piece is set to the window frame, the handle is set to the window body, the sliding piece is slidably arranged in the window body, the limiting piece is movably arranged in the window body, the handle is respectively connected with the hinge mechanism and the sliding piece transmission;When the handle switches to closed position, the sliding piece slides to the first position;When the handle switches to flat opening position, the sliding piece slides to the second position;When the handle switches to inside tilting position, the sliding piece slides to the third position;When the window body is in closed state relative to the window frame, the limiting piece and the knob piece are in contact, the limiting piece is triggered and moves to unlocking position;When the window body is in flat opening state or inside tilting state relative to the window frame, the limiting piece and the knob piece are separated, and the limiting piece is not triggered and is in limiting position.

[0013] According to some embodiments of the utility model, the inside opening and inside tilting window further includes a corner turner, the corner turner is arranged on the window body, and the limiting piece is rotatably arranged in the corner turner.

[0014] According to some embodiments of the utility model, the corner turner is provided with a sliding groove, and the sliding piece is slidably connected to the sliding groove.

[0015] According to some embodiments of the utility model, the corner turner is provided with a rotating cavity, and the limiting piece is rotatably arranged in the rotating cavity.

[0016] In summary, the limiting mechanism and the inside opening and inside tilting window comprising the same provided by the utility model have at least the following technical effects:

[0017] When the sliding piece slides from the first position to the second position and the limiting piece is triggered, the limiting piece is in the unlocking position, the limiting piece is located outside the sliding path of the sliding piece to allow the sliding piece to slide from the second position to the third position, at this time, the handle can be switched to the inside tilting position to allow the window body to be switched to the inside tilting state.

[0018] When the sliding piece slides from the first position to the second position and the limiting piece is not triggered, the limiting piece is in the limiting position, the limiting piece is located in the sliding path of the sliding piece to limit the sliding piece from moving from the second position to the third position, at this time, the sliding piece will be kept in the second position, thereby keeping the handle in the flat opening position, and only when the limiting piece is triggered can the window body be switched to the inside tilting state, thereby avoiding the problem that the upper part of the window body will also tilt while being flat opened due to misoperation of the handle, improving the safety performance of the inside opening and inside tilting window, the limiting mechanism is simple in structure, easy to install and maintain, and reduces production cost and use cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Structure schematic view of the inward-opening and inward-falling window in a closed state according to an embodiment of the present application;

[0020] Figure 2 Structure schematic view of the inward-opening and inward-falling window in a flat-opening state according to an embodiment of the present application;

[0021] Figure 3 Structure schematic view of the inward-opening and inward-falling window in an inward-falling state according to an embodiment of the present application;

[0022] Figure 4 Assembly structure schematic view of the sliding member, the limiting member and the corner turner (the sliding member is in the first position and the limiting member is not triggered) according to an embodiment of the present application;

[0023] Figure 5 Exploded structure schematic view of the sliding member, the limiting member and the corner turner according to an embodiment of the present application;

[0024] Figure 6 Assembly structure schematic view of the sliding member, the limiting member and the corner turner (the sliding member is in the second position and the limiting member is not triggered) according to an embodiment of the present application;

[0025] Figure 7 Assembly structure schematic view of the sliding member, the limiting member and the corner turner (the sliding member is in the second position and the limiting member is triggered) according to an embodiment of the present application;

[0026] Figure 8 Assembly structure schematic view of the sliding member, the limiting member and the corner turner (the sliding member is in the third position and the limiting member is not triggered) according to an embodiment of the present application;

[0027] In the drawings, the following notations are used:

[0028] 1, sliding member; 11, protruding rib; 111, arc-shaped protrusion; 2, limiting member; 21, limiting block; 211, arc-shaped slot; 22, rotating shaft; 3, elastic reset member; 4, window body; 5, window frame; 6, corner turner; 61, sliding groove; 62, rotating cavity; 7, hinge mechanism; 8, actuating member; 9, handle. DETAILED DESCRIPTION

[0029] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0030] In the description of the utility model, it needs to explain, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the utility model.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0032] The utility model will be explained further in detail below in combination with the drawings.

[0033] Please refer to Figures 4 to 8 , the embodiment discloses a limiting mechanism for a inward opening and tilting window, comprising a sliding piece 1 and a limiting piece 2: the sliding piece 1 is used for slidingly arranged in the window body 4, and the sliding piece 1 is also used for transmission connection with the handle 9, under the driving of the handle 9, the sliding piece 1 can be sequentially slid from the first position to the second position and the third position;The limiting piece 2 is used for movably arranged in the window body 4, and the limiting piece 2 can be moved from the limiting position to the unlocking position when being triggered;When the limiting piece 2 is triggered, the limiting piece 2 is in the unlocking position, and the limiting piece 2 is located outside the sliding path of the sliding piece 1 to allow the sliding piece 1 to slide between the second position and the third position;When the limiting piece 2 is not triggered, the limiting piece 2 is in the limiting position, and the limiting piece 2 is located in the sliding path of the sliding piece 1 to limit the sliding piece 1 to slide between the second position and the third position;

[0034] As Figures 1 to 3 Indicated, it can be understood that the handle 9 is used for being arranged in the window body 4, and the handle 9 can be switched between the closed position, the flat opening position and the inward tilting position to make the window body 4 switch between the closed state, the flat opening state and the inward tilting state.

[0035] Specifically, in the embodiment, as Figure 1 Indicated, if the sliding piece 1 is in the first position, the handle 9 has been correspondingly switched to the closed position, at this time, the handle 9 is vertically downward, if the sliding piece 1 is in the second position, the handle 9 has been correspondingly switched to the flat opening position, at this time, the handle 9 is in the horizontal position;If the sliding piece 1 is in the third position, the handle 9 has been correspondingly switched to the inward tilting state, at this time, the handle 9 is vertically upward;

[0036] As Figure 7As shown, when the sliding member 1 slides from the first position to the second position and the limiting member 2 is triggered, the limiting member 2 is in the unlocking position, the limiting member 2 is located outside the sliding path of the sliding member 1 to allow the sliding member 1 to slide from the second position to the third position, at this time the handle can be switched to the inward tilting position to allow the window body 4 to be switched to the inward tilting state.

[0037] As shown, when the sliding member 1 slides from the first position to the second position and the limiting member 2 is not triggered, the limiting member 2 is in the limiting position, the limiting member 2 is located inside the sliding path of the sliding member 1 to limit the sliding member 1 from moving from the second position to the third position, at this time the sliding member 1 will be kept in the second position, thereby keeping the handle 9 in the casement position, and only when the limiting member 2 is triggered can the window body 4 be switched to the inward tilting state, thereby avoiding the problem that the upper part of the window body 4 will also tilt when the window body 4 is in the casement state due to misoperation of the handle, improving the safety performance of the inward tilting window, the limiting mechanism is simple in structure, easy to install and maintain, and reduces production and use costs. Figure 6 Specifically, in the present embodiment, the limiting member 2 is used to cooperate with the actuator 8 in the window frame 5, when the window body 4 is in the closed state, the limiting member 2 is in contact with the actuator 8 and moves to the unlocking position under the action of the actuator 8, at this time, the limiting member 2 no longer hinders the further sliding of the sliding member 1, thereby allowing the handle 9 to be switched from the casement position to the inward tilting position, and further allowing the window body 4 to be switched from the casement state to the inward tilting state, the cooperation design of the actuator 8 and the limiting member 2 makes the window body 4 only be able to be switched to the inward tilting state when it is completely closed, further enhancing the safety and convenience of use. Of course, the limiting member 2 can also be directly manually actuated to trigger the limiting member 2, considering that in actual use, the limiting mechanism may fail to cooperate due to various reasons, causing the limiting member 2 to fail to be triggered or unlocked correctly, in order to deal with this situation, the limiting member 2 in the present embodiment is also designed to be manually actuated to reset, specifically, when it is found that the limiting mechanism fails to work normally, the user can directly manually actuate the limiting member 2 to move it from the limiting position to the unlocking position or vice versa, such manual operation can be completed by a simple tool (such as a screwdriver, a key, etc.) or directly by a finger, depending on the design and structure of the limiting member 2.

[0038] Specifically, in the present embodiment, the sliding member 1 makes linear reciprocating motion along the up-down direction.

[0039] Figure 6 As shown, when the sliding member 1 slides from the first position to the second position and the limiting member 2 is triggered, the limiting member 2 is in the unlocking position, the limiting member 2 is located outside the sliding path of the sliding member 1 to allow the sliding member 1 to slide from the second position to the third position, at this time the handle can be switched to the inward tilting position to allow the window body 4 to be switched to the inward tilting state.

[0040] As shown, when the sliding member 1 slides from the first position to the second position and the limiting member 2 is not triggered, the limiting member 2 is in the limiting position, the limiting member 2 is located inside the sliding path of the sliding member 1 to limit the sliding member 1 from moving from the second position to the third position, at this time the sliding member 1 will be kept in the second position, thereby keeping the handle 9 in the casement position, and only when the limiting member 2 is triggered can the window body 4 be switched to the inward tilting state, thereby avoiding the problem that the upper part of the window body 4 will also tilt when the window body 4 is in the casement state due to misoperation of the handle, improving the safety performance of the inward tilting window, the limiting mechanism is simple in structure, easy to install and maintain, and reduces production and use costs. Figures 1 to 8 ​As shown, in addition, the embodiment also provides an inward opening and inward tilting window, which comprises the limiting mechanism as above, and further comprises a handle 9, a hinge mechanism 7, a window frame 5, a window body 4 and a pusher 8; the hinge mechanism 7 is connected between the window frame 5 and the window body 4, the pusher 8 is arranged on the window frame 5, the handle 9 is arranged on the window body 4, and the handle 9 is in transmission connection with the hinge mechanism 7 and the sliding piece 1 respectively; when the handle 9 is switched to the closed position, the sliding piece 1 slides to the first position; when the handle 9 is switched to the flat opening position, the sliding piece 1 slides to the second position; when the handle 9 is switched to the inward tilting position, the sliding piece 1 slides to the third position; when the window body 4 is in the closed state relative to the window frame 5, the limiting piece 2 and the pusher 8 are in contact, and the limiting piece 2 is triggered to move to the unlocking position; when the window body 4 is in the flat opening state or the inward tilting state relative to the window frame 5, the limiting piece 2 and the pusher 8 are separated, and the limiting piece 2 is not triggered to be in the limiting position. In this way, only when the window body 4 is completely moved into the window frame 5 to make the limiting piece 2 and the pusher 8 in contact, the handle 9 can be switched to the inward tilting position to switch the window body 4 to the inward tilting position, thereby avoiding the problem that the upper part of the window body 4 will also tilt when it is flat opened due to misoperation of the handle, and the cooperation design of the pusher 8 and the limiting piece 2 makes the window body 4 only be able to be switched to the inward tilting state when it is completely closed, further enhancing the safety and convenience of use.

[0041] As shown in the drawings, Figure 5 Further, in the embodiment, the limiting mechanism further comprises an elastic reset piece 3, which is configured to elastically reset the limiting piece 2 from the unlocking position to the limiting position; when the sliding piece 1 is in the second position and the limiting piece 2 is not triggered, the limiting piece 2 is reset to the limiting position; when the sliding piece 1 is in the third position and the limiting piece 2 is not triggered, the limiting piece 2 is reset to the limiting position, and the limiting piece 2 is located in the sliding path of the sliding piece 1 to limit the movement of the sliding piece 1 from the third position to the second position, at this time, the sliding piece 1 can be kept in the third position, that is, the handle 9 can be kept in the inward tilting position, thereby making the window body 4 keep in the inward tilting state; in this way, the elastic piece is configured to elastically reset the limiting piece 2 from the unlocking position to the limiting position when it is not subjected to external force, and this design ensures that when the window body 4 is in the flat opening state or the inward tilting state, the limiting piece 2 can automatically return to its initial limiting position, thereby preventing accidental movement of the sliding piece 1; in this way, if the limiting piece 2 is not triggered, the elastic reset piece 3 will reset the limiting piece 2 to the limiting position. After the limiting piece 2 is reset to the limiting position, it is located in the sliding path of the sliding piece 1, forming a physical barrier to limit the movement of the sliding piece 1 from the third position to the second position, so that the window body 4 can keep in the inward tilting state even if it is affected by external pressure or wind force, this design not only improves the safety and stability of the window, but also provides users with a more convenient and comfortable use experience.

[0042] As shown in the drawings, Figure 4 ,Figure 6 、 Figure 7 and Figure 8 As shown in

[0043] As shown in Figure 4 and Figure 5 More preferably, in the embodiment, the first side of the limiting block 21 is provided with an arc-shaped slot 211, and the first end of the convex rib 11 is provided with an arc-shaped protrusion 111 matched with the arc-shaped slot 211, and when the sliding piece 1 slides from the first position to the second position and the limiting piece 2 is not triggered, the arc-shaped protrusion 111 abuts against the arc-shaped slot 211, which improves the stability of the mechanism during movement, avoids the failure of the mechanism due to deviation or jamming, and enhances the safety and reliability of the window body 4.

[0044] As shown in Figure 5 More preferably, in the embodiment, the first end of the limiting piece 2 is provided with a rotating shaft 22, the second end of the limiting piece 2 is rotationally arranged around the rotating shaft 22, and the elastic return piece 3 exerts an elastic force on the rotating shaft 22. In this way, the arrangement of the rotating shaft 22 enables the limiting piece 2 to rotate around the rotating shaft 22 within a certain range, which not only improves the flexibility of the mechanism but also enhances its stability between different positions. Even when subjected to external force, the limiting piece 2 can adapt to changes by rotating, thereby avoiding the failure of the mechanism due to rigid connection. Moreover, the elastic return piece 3 exerts an elastic force on the rotating shaft 22, so that the limiting piece 2 can be continuously subjected to an elastic force during rotation, which helps to maintain good cooperation between the limiting piece 2 and the sliding piece 1, reduces friction and resistance, and thus improves the smoothness of the mechanism during movement.

[0045] As shown in Figure 5As shown, preferably, in the present embodiment, the elastic reset member 3 is a torsion spring, which is sleeved on the rotating shaft 22. In this way, on the one hand, the torsion spring, as the elastic reset member 3, is sleeved on the rotating shaft 22, and can provide a continuous and stable elastic force when the limiting member 2 rotates. This design not only helps to maintain good cooperation between the limiting member 2 and the sliding member 1, reduces friction and resistance, but also enables the limiting member 2 to be precisely controlled by the elastic force during rotation, thereby improving the smoothness and accuracy of the mechanism during movement. On the other hand, as a common mechanical element, the torsion spring has the advantages of simple structure, low cost, easy replacement, etc., thereby reducing the maintenance cost of the mechanism and prolonging the service life. On the other hand, the design of the torsion spring sleeved on the rotating shaft 22 not only simplifies the structure of the mechanism, but also optimizes the space layout, making the entire limiting mechanism more compact and lightweight. This design not only reduces the manufacturing cost, but also improves the installation convenience of the mechanism.

[0046] As shown, Figures 4 to 8 specifically, in the present embodiment, the inner opening and reversing device further comprises a corner turner 6, which is arranged on the window body 4. The limiting member 2 is arranged to rotate on the corner turner 6, and the sliding member 1 is arranged to slide on the corner turner 6. In this way, the limiting member 2 and the sliding member 1 are both arranged on the corner turner 6, making the entire mechanism more compact and integrated, and improving the space utilization.

[0047] It should be noted that in some other embodiments, the corner turner 6 can also be arranged on the frame of the window body 4, but is not limited thereto, and can be selected according to actual needs.

[0048] As shown, Figure 5 preferably, in the present embodiment, the corner turner 6 is provided with a sliding groove 61, and the sliding member 1 is slidingly connected to the sliding groove 61. The sliding connection design of the sliding groove 61 and the sliding member 1 enables the window body 4 to smoothly slide along the predetermined path during opening or closing, reducing friction and resistance and thereby improving the smoothness of operation. At the same time, the guiding effect of the sliding groove 61 ensures the stability of the sliding member 1 during movement, avoiding damage to the mechanism or operation errors due to shaking or deviation.

[0049] As shown, Figure 5 preferably, in the present embodiment, the corner turner 6 is provided with a rotating cavity 62, and the rotating shaft 22 of the limiting member 2 is arranged in the rotating cavity. The limiting member 2 is arranged to rotate in the rotating cavity 62 through the rotating shaft 22. The arrangement of the rotating cavity 62 enables the limiting member 2 to rotate flexibly inside it. This design not only improves the flexibility of the mechanism, but also enables the limiting member 2 to respond quickly to external operations, thereby achieving rapid opening or closing of the window body 4. Furthermore, the design makes the entire mechanism more compact and integrated, reducing the space occupied by the mechanism.

[0050] In summary, the utility model discloses the technical scheme of limiting mechanism and the inner opening and inner tilting window including it can bring at least following beneficial technical effects:

[0051] 1) can avoid the problem that the window body 4 appears to dump on the upper portion while being opened by the misoperation handle, the cooperation design of the actuating member 8 and the limiting piece 2 makes the window body 4 only can be switched to the inner tilting state when being completely closed, further enhances the security and the convenience of use;

[0052] 2) limiting piece 2 is also designed to be manually actuated to reset, when finding that the limiting mechanism cannot normally work, user can directly manually actuate limiting piece 2, make it move from the limiting position to the unlocking position or vice versa;

[0053] 3) if limiting piece 2 is not triggered, the elastic reset piece 3 will play a role, and the window body 4 can be kept in the inner tilting state, even if being affected by external pressure or wind force can keep stable, this design not only improves the security and stability of the window, but also provides more convenient and comfortable use experience for user;

[0054] 4) limiting piece 2 and sliding piece 1 are all arranged on the corner gear 6, make the whole mechanism more compact, integrated, improve the space utilization.

[0055] The technical means disclosed in the utility model scheme is not only limited to the technical means disclosed in the above embodiment, but also includes the technical scheme composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the utility model, some improvements and refinements can be made, and these improvements and refinements are also considered within the protection scope of the utility model.

Claims

1. A limiting mechanism for an in-swinging and in-tilting window, characterized in that, The application relates to a sliding window mechanism, comprising: a sliding piece (1) in transmission connection with a handle (9), which can slide from a first position to a second position and a third position under the drive of the handle (9); a limiting piece (2) movably arranged on a window body (4), which can move from a limiting position to an unlocking position when triggered; when the limiting piece (2) is triggered, the limiting piece (2) is in the unlocking position and is located outside the sliding path of the sliding piece (1) to allow the sliding piece (1) to slide between the second position and the third position; when the limiting piece (2) is not triggered, the limiting piece (2) is in the limiting position and is located in the sliding path of the sliding piece (1) to limit the sliding of the sliding piece (1) between the second position and the third position.

2. The position limiting mechanism of claim 1, wherein The limiting mechanism further comprises an elastic reset piece (3) configured to elastically reset the limiting piece (2) from the unlocking position to the limiting position. When the sliding piece (1) is in the second position or the third position and the limiting piece (2) is not triggered, the limiting piece (2) is reset to the limiting position and is located in the sliding path of the sliding piece (1) to limit the sliding of the sliding piece (1) between the second position and the third position.

3. The stop mechanism of claim 2, wherein The sliding piece (1) is provided with a convex rib (11) which synchronously slides with the sliding piece (1), and the limiting piece (2) is provided with a limiting block (21); when the sliding piece (1) is in the second position and the limiting piece (2) is not triggered, the first end of the convex rib (11) abuts against the first side of the limiting block (21); when the sliding piece (1) is in the third position and the limiting piece (2) is not triggered, the second end of the convex rib (11) abuts against the second side of the limiting block (21).

4. The limit mechanism of claim 3, wherein The first side of the limiting block (21) is provided with an arc-shaped groove (211), and the first end of the convex rib (11) is provided with an arc-shaped convex (111) matched with the arc-shaped groove (211); when the sliding piece (1) is in the second position and the limiting piece (2) is not triggered, the arc-shaped convex (111) abuts against the arc-shaped groove (211).

5. The limit mechanism of claim 2, wherein The first end of the limiting piece (2) is provided with a rotating shaft (22), and the second end of the limiting piece (2) is rotatably arranged around the rotating shaft (22); the elastic reset piece (3) elastically acts on the rotating shaft (22).

6. The limit mechanism of claim 5, wherein, The elastic reset piece (3) is a torsion spring which is sleeved on the rotating shaft (22).

7. An inwardly opening casement window characterised in that, The limiting mechanism as claimed in any one of claims 1-6, further comprising a handle (9), a hinge mechanism (7), a window frame (5), a window body (4) and a pusher (8); the hinge mechanism (7) is connected between the window frame (5) and the window body (4), the pusher (8) is arranged on the window frame (5), the handle (9) is arranged on the window body (4), the sliding member (1) is slidingly arranged on the window body (4), the limiting member (2) is movably arranged on the window body (4), the handle (9) is in transmission connection with the hinge mechanism (7) and the sliding member (1) respectively; when the handle (9) is switched to a closed position, the sliding member (1) slides to the first position; when the handle (9) is switched to a side-hung position, the sliding member (1) slides to the second position; when the handle (9) is switched to an inwardly-retracted position, the sliding member (1) slides to the third position. When the window body (4) is in a closed state relative to the window frame (5), the limiting member (2) and the pusher (8) are in contact, the limiting member (2) is triggered to move to an unlocking position; When the window body (4) is in a side-hung state or an inwardly-retracted state relative to the window frame (5), the limiting member (2) and the pusher (8) are separated, the limiting member (2) is not triggered and is in a limiting position.

8. The interior-opening, interior-folding window of claim 7, wherein, The inwardly-retracting window further comprises a corner turner (6), the corner turner (6) is arranged on the window body (4), the limiting member (2) is rotatably arranged on the corner turner (6), and the sliding member (1) is slidingly arranged on the corner turner (6).

9. The interior-opening, interior-folding window of claim 8, wherein, The corner turner (6) is provided with a sliding groove (61), and the sliding member (1) is slidingly connected to the sliding groove (61).

10. The interior-opening, interior-folding window of claim 8, wherein, The corner turner (6) is provided with a rotating cavity (62), and the limiting member (2) is rotatably arranged in the rotating cavity (62).

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