A hinge mechanism

Abstract

The present application relates to a kind of hinge mechanisms, belong to hardware structural member field.Window sash can be rotatably arranged in window frame by hinge mechanism, and hinge mechanism includes hinge base, slider, long branch, middle branch, window sash installation base and short branch.Hinge base is installed in the bottom frame of window frame, and hinge base has relatively arranged first end and second end in its length direction, and first end is closer to the intersection line of bottom frame and side frame of window frame than second end;Slider is slidably arranged in hinge base and located between first end and second end along length direction;One end of long branch is hinged with second end;One end of middle branch is hinged with slider, and middle part of long branch and middle part of middle branch are hinged;One end of window sash installation base is hinged with the other end of long branch;Two ends of short branch are respectively hinged with the other end of middle branch and window sash installation base.

Description

Technical Field

[0001] This invention belongs to the field of hardware structural components, and specifically relates to a hinge mechanism. Background Technology

[0002] Currently, most European standard aluminum alloy inward-opening and bottom-hung systems in the door and window hardware industry have exposed hinges.

[0003] For example, Chinese Patent Publication No. (CN113982399B) discloses a hinge angle adjustment mechanism and a concealed hinge, including a frame mounting base, a long support plate, and a middle support plate. The middle support plate and the long support plate are arranged crosswise and hinged together by a first pin. The proximal end of the middle support plate is hinged to the frame mounting base, and the proximal end of the long support plate is hinged to a sliding seat. The frame mounting base is provided with a groove having a contraction groove section. The sliding seat slides in the groove, and the sliding seat supports an angle adjustment screw. The lower end of the angle adjustment screw is provided with a limiting part that can slide in the groove. Before rotating the angle adjustment screw, the contraction groove section limits the limiting part. After rotating the angle adjustment screw, the limiting part can pass through the contraction groove section. However, the above-mentioned prior art still has the following technical problems: When the window sash is opened and pushed outward from the window frame, it will move closer to the side edge of the window frame. If there are any objects between the window sash and the window frame at this time, it will interfere with the opening of the window sash and make it difficult to open and close the window sash. Summary of the Invention

[0004] In view of the above problems, this application provides a hinge mechanism that facilitates the opening and closing of window sashes.

[0005] This application provides a hinge mechanism in which a window sash can be rotatably mounted on a window frame. The hinge mechanism includes a hinge base, a slider, a long support plate, a middle support plate, a window sash mounting base, and a short support plate. The hinge base is mounted on the bottom edge of the window frame and has a first end and a second end disposed opposite each other along its length. The first end is closer to the boundary line between the bottom edge and the side edge of the window frame than the second end. The slider is slidably disposed on the hinge base along its length and is located between the first end and the second end. One end of the long support plate is hinged to the second end. One end of the middle support plate is hinged to the slider, and the middle portions of the long support plate and the middle portion of the middle support plate are hinged together. One end of the window sash mounting base is hinged to the other end of the long support plate. Both ends of the short support plate are respectively hinged to the other end of the middle support plate and the window sash mounting base.

[0006] Specifically, when the window is closed, the slider is at the end closest to the first end of its sliding stroke. At this time, the end of the middle support plate that is hinged to the hinge base points to the end of the middle support plate that is hinged to the short support plate, which is parallel to the direction from the first end to the second end. The end of the long support plate that is hinged to the hinge base points to the end of the long support plate that is hinged to the window sash mounting base, which is parallel to the direction from the second end to the first end.

[0007] As the window sash is pushed to detach from the window frame, the long support plate rotates around the end that is hinged to the hinge base, causing the window sash mounting base and the window sash to move outward. During this time, the slider slides towards the second end, causing the end of the middle support plate that is hinged to the short support plate to rotate outward. This allows the middle support plate to support the window sash mounting base through the short support plate, thus working in conjunction with the long support plate to support the window sash.

[0008] In the above technical solution, during the process of pushing the window sash to detach it from the window frame, the long support plate rotates around the end that is hinged to the hinge base, thereby driving the window sash mounting base and the window sash to move outward, thus driving the window sash to rotate towards the side frame away from the window frame, thereby reducing the risk of interference with the opening of the window sash and facilitating the opening and closing of the window sash.

[0009] In some embodiments, the hinge base is provided with a slide groove extending along the length direction, and the hinge mechanism further includes a limiting block, which is adjustablely disposed in the slide groove along the length direction and divides the slide groove into a first sub-segment located between the first end and the limiting block. A slider is slidably disposed in the first sub-segment, and the limiting block moves along the length direction to adjust the length of the first sub-segment.

[0010] Specifically, the long support piece located between the hinge point of the middle and long support pieces and the window sash mounting base, the middle support piece located between the hinge point of the middle and long support pieces and the short support piece, the short support piece, and the window sash mounting base together form a first quadrilateral. The long support piece located between the hinge point of the middle and long support pieces and the hinge base, the middle support piece located between the hinge point of the middle and long support pieces and the hinge base, and the hinge base together form a first triangle. This allows the length of the first segment to be adjusted, thereby adjusting the range of the length of the side of the first triangle parallel to the hinge base, and further adjusting the range of the included angle between the middle and long support pieces in the first triangle, and further adjusting the range of the included angle between the middle and long support pieces in the first quadrilateral, thereby adjusting the range between the window sash and the window frame.

[0011] In the above technical solution, by setting a sliding groove to accommodate the slider and the limiting block, the risk of interference between the limiting block and the long and middle support pieces is reduced. At the same time, it is convenient to adjust the maximum angle that the window sash can open relative to the window frame by adjusting the limiting block.

[0012] In some embodiments, the slide groove extends through the hinge base along the thickness direction of the hinge base, and the hinge mechanism further includes a first screw. The limiting block is provided with a first mounting hole for the first screw to pass through. The first screw passes through the first mounting hole and is inserted into the bottom frame of the window frame to releasably fix the limiting block in the slide groove.

[0013] In the above technical solution, the limiting block is releasably fixed in the slide groove by the first screw, so that the limiting structure of the limiting block is simple and easy to implement.

[0014] In some embodiments, the side frame of the window frame is provided with a first snap-fit ​​groove, the bottom frame of the window frame is provided with a second snap-fit ​​groove, and the first end is provided with a first snap-fit ​​part, which is used to snap-fit ​​with the first snap-fit ​​groove; the hinge mechanism also includes a locking piece, which is detachably provided on the side of the hinge base away from the long support piece, and the locking piece is used to snap-fit ​​with the second snap-fit ​​groove.

[0015] In the above technical solution, by setting a first snap-fit ​​part and a second snap-fit ​​part, the hinge mechanism can be fixed to the window frame, thereby facilitating the installation and disassembly of the hinge mechanism.

[0016] In some embodiments, the long support plate includes a first straight portion, a first flanged portion, and a second straight portion connected in sequence. The end of the first straight portion away from the first flanged portion is hinged to the hinge base, and the end of the second straight portion away from the first flanged portion is hinged to the window sash mounting base. When the hinge mechanism is in the retracted state, in the thickness direction of the hinge base, the side of the first straight portion facing the hinge base abuts against the hinge base, and the side of the second straight portion facing the hinge base has a first gap with the hinge base, and the middle support plate is located within the first gap.

[0017] In the above technical solution, by setting the second straight section to have a first gap with the hinge base when it is in the retracted state to accommodate the middle support piece, the risk of interference between the middle support piece and the long support piece during the opening and closing of the window sash is reduced.

[0018] In some embodiments, when the hinge mechanism is in the retracted state, in the thickness direction, the side of the middle support plate facing the hinge base abuts against the hinge base, and the side of the second straight portion facing the hinge base abuts against the side of the middle support plate away from the hinge base.

[0019] In the above technical solution, when the middle support plate is in the retracted state, the side of the middle support plate facing the hinge base abuts against the hinge base in the thickness direction, and the side of the second straight portion facing the hinge base abuts against the side of the middle support plate away from the hinge base. This allows the middle support plate to support the second straight portion when retracted, reducing the risk of deformation of the second straight portion and reducing the risk of the hinge mechanism jamming due to prolonged closure.

[0020] In some embodiments, in the thickness direction, the short support piece is located on the side of the middle support piece away from the hinge base, and a receiving groove is provided at the end of the second straight portion facing the short support piece; when the hinge mechanism is in the retracted state, the short support piece is received in the receiving groove.

[0021] In the above technical solution, by accommodating the short support piece in the receiving groove when it is in the retracted state, the volume of the hinge mechanism is reduced in the retracted state, which is beneficial to hiding the hinge mechanism.

[0022] In some embodiments, in the thickness direction, the two sides of the short support piece disposed opposite each other are flush with the two sides of the second straight portion disposed opposite each other; when the hinge mechanism is in the retracted state, in the thickness direction, the short support piece is sandwiched between the middle support piece and the window sash mounting base.

[0023] In the above technical solution, when the window is closed, the short support piece is sandwiched between the middle support piece and the window sash mounting base in the thickness direction, so that the middle support piece can support the window sash mounting base through the short support piece when closed, which further reduces the risk of deformation of the second straight part and further reduces the risk of the hinge mechanism jamming due to prolonged closure.

[0024] In some embodiments, the window sash mounting base includes a third straight portion and a second flanged portion. One end of the third straight portion is hinged to the end of the second straight portion away from the first flanged portion, and the third straight portion is used to support the bottom frame of the window sash; the second flanged portion is folded from one side of the third straight portion toward the hinge base; when the hinge mechanism is in the retracted state, the second flanged portion abuts against the side of the short support piece away from the long support piece.

[0025] In the above technical solution, by setting a second folding part, the positions of the long support piece, the middle support piece, the window sash mounting base and the short support piece are limited when the window sash is closed, thereby reducing the risk of excessive rotation of the window sash.

[0026] In some embodiments, the side frame of the window sash is provided with a third snap-fit ​​groove, and the window sash mounting base also includes a second snap-fit ​​portion, which protrudes from the side of the third straight portion away from the hinge base and is used to snap into the third snap-fit ​​groove.

[0027] In the above technical solution, the second snap-fit ​​part is provided to facilitate the limiting and fixing of the window sash mounting base and the window sash. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 An exploded view of the hinge mechanism provided in an embodiment of the present invention; Figure 2 A schematic diagram of the hinge mechanism in an open state according to an embodiment of the present invention; Figure 3 A schematic diagram of the hinge mechanism in the retracted state provided in an embodiment of the present invention; Figure 4 for Figure 2 A schematic diagram of the hinge mechanism in the A direction; Figure 5 A schematic diagram of the hinge mechanism in another open state provided in an embodiment of the present invention; Figure 6 A schematic diagram of the hinge mechanism provided in this embodiment of the invention when it is assembled on a window frame and a window sash and is in an open state; Figure 7 A schematic diagram of the hinge mechanism provided in this embodiment of the invention when it is assembled on the window frame and window sash and is in another open state; Figure 8 for Figure 6 A magnified view of a section at point C; Figure 9 A schematic diagram of the structure of the long support sheet provided in the embodiment of the present invention; Figure 10 for Figure 3 A schematic diagram of the hinge mechanism in the B direction; Figure 11 for Figure 9 A schematic diagram of the structure of the long branch plate in the D direction; Figure 12 A schematic diagram of the structure of the window sash mounting base provided in this embodiment of the invention. Detailed Implementation

[0030] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0031] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] Reference Figures 1-7 This application provides a hinge mechanism 100, through which the window sash 300 can be rotatably mounted on the window frame 200. The hinge mechanism 100 includes a hinge base 10, a slider 20, a long support piece 30, a middle support piece 40, a window sash 300 mounting base 50, and a short support piece 60. The hinge base 10 is installed on the bottom edge of the window frame 200. The hinge base 10 has a first end 10A and a second end 10B that are arranged opposite each other in its length direction. The first end 10A is closer to the junction line of the bottom edge and the side edge of the window frame 200 than the second end 10B. The slider 20 is slidably disposed on the hinge base 10 in the length direction and is located between the first end 10A and the second end 10B. One end of the long support piece 30 is hinged to the second end 10B. One end of the middle support piece 40 is hinged to the slider 20, and the middle part of the long support piece 30 and the middle part of the middle support piece 40 are hinged together. One end of the window sash 300 mounting base 50 is hinged to the other end of the long support piece 30. The two ends of the short support piece 60 are respectively hinged to the other end of the middle support piece 40 and the window sash 300 mounting base 50.

[0035] For example, all of the above structures are hinged by hinge pins.

[0036] Understandably, the length of the long support 30 is greater than that of the medium support 40, which is greater than that of the short support 60.

[0037] In some embodiments, the window sash 300 mounting base 50 is detachably connected to the window sash 300 by screws.

[0038] Specifically, when the window is closed, the slider 20 is located at the end of its sliding stroke closest to the first end 10A. At this time, the end of the middle support plate 40 that is hinged to the hinge base 10 points in the direction of the end of the middle support plate 40 that is hinged to the short support plate 60, which is parallel to the direction of the first end 10A pointing to the second end 10B. The end of the long support plate 30 that is hinged to the hinge base 10 points in the direction of the long support plate 30 that is hinged to the window sash 300 mounting base 50, which is parallel to the direction of the second end 10B pointing to the first end 10A.

[0039] During the process of pushing the window sash 300 to detach it from the window frame 200, the long support plate 30 rotates around the end that is hinged to the hinge base 10, thereby driving the window sash 300 mounting base 50 and the window sash 300 to move outward. During this period, the slider 20 slides towards the second end 10B so that the end of the middle support plate 40 that is hinged to the short support plate 60 rotates outward, thereby allowing the middle support plate 40 to support the window sash 300 mounting base 50 through the short support plate 60, thus cooperating with the long support plate 30 to support the window sash 300.

[0040] In this technical solution, during the process of pushing the window sash 300 to detach it from the window frame 200, the long support piece 30 rotates around the end that is hinged to the hinge base 10, thereby driving the window sash 300 mounting base 50 and the window sash 300 to move outward, thereby driving the window sash 300 to rotate towards the side frame away from the window frame 200, thus reducing the risk of interference with the opening of the window sash 300 and facilitating the opening and closing of the window sash 300.

[0041] Please refer to Figures 1-7 According to some embodiments of this application, the hinge base 10 is provided with a slide groove 11 extending along the length direction. The hinge mechanism 100 also includes a limiting block 70, which is adjustablely disposed in the slide groove 11 along the length direction and divides the slide groove 11 into a first sub-segment 111 located between the first end 10A and the limiting block 70. The slider 20 is slidably disposed in the first sub-segment 111, and the limiting block 70 moves along the length direction to adjust the length of the first sub-segment 111.

[0042] Specifically, the portion of the long support 30 located between the hinge point of the middle support 40 and the long support 30 and the mounting base 50 of the window sash 300, the portion of the middle support 40 and the long support 30 located between the hinge point of the middle support 40 and the long support 30 and the short support 60, and the mounting base 50 of the window sash 300 together form a first quadrilateral. The portion of the long support 30 located between the hinge point of the middle support 40 and the long support 30 and the hinge base 10, the portion of the middle support 40 located between the hinge point of the middle support 40 and the long support 30 and the hinge base 10 together form a first triangle. This allows the length of the first segment 111 to be adjusted, thereby adjusting the range of the length of the side of the first triangle parallel to the hinge base 10, and further adjusting the range of the included angle between the middle support 40 and the long support 30 in the first triangle, and further adjusting the range of the included angle between the middle support 40 and the long support 30 in the first quadrilateral, thereby adjusting the range between the window sash 300 and the window frame 200.

[0043] In this technical solution, by setting the slide groove 11 to accommodate the slider 20 and the limiting block 70, the risk of interference between the limiting block 70 and the long support piece 30 and the middle support piece 40 is reduced. At the same time, it is convenient to adjust the maximum angle that the window sash 300 can open relative to the window frame 200 by adjusting the limiting block 70.

[0044] Please refer to Figure 8 According to some embodiments of this application, the slide 11 extends through the hinge base 10 along the thickness direction of the hinge base 10. The hinge mechanism 100 also includes a first screw 71. The limiting block 70 is provided with a first mounting hole for the first screw 71 to pass through. The first screw 71 passes through the first mounting hole and is inserted into the bottom frame of the window frame 200 to releasably fix the limiting block 70 in the slide 11.

[0045] In this technical solution, the limiting block 70 is releasably fixed in the slide groove 11 by the first screw 71, so as to complete the limiting structure of the limiting block 70. This structure is simple and easy to implement.

[0046] Please refer to Figure 6 and Figure 7 According to some embodiments of this application, the side frame of the window frame 200 is provided with a first snap-fit ​​groove 210, the bottom frame of the window frame 200 is provided with a second snap-fit ​​groove 220, and the first end 10A is provided with a first snap-fit ​​part 12, which is used to snap-fit ​​with the first snap-fit ​​groove 210; the hinge mechanism 100 also includes a locking piece 13, which is detachably provided on the side of the hinge base 10 away from the long support piece 30, and the locking piece 13 is used to snap-fit ​​with the second snap-fit ​​groove 220.

[0047] In some embodiments, the locking piece 13 is detachably connected to the hinge base 10 by screws.

[0048] In this technical solution, the first snap-fit ​​part 12 and the second snap-fit ​​part 53 are provided to fix the hinge mechanism 100 to the window frame 200, thereby facilitating the installation and disassembly of the hinge mechanism 100.

[0049] Please refer to Figure 9 and Figure 10 According to some embodiments of this application, the long support piece 30 includes a first straight portion 31, a first flange portion 32, and a second straight portion 33 connected in sequence. The end of the first straight portion 31 away from the first flange portion 32 is hinged to the hinge base 10, and the end of the second straight portion 33 away from the first flange portion 32 is hinged to the window sash 300 mounting base 50. When the hinge mechanism 100 is in the retracted state, in the thickness direction of the hinge base 10, the side of the first straight portion 31 facing the hinge base 10 abuts against the hinge base 10, and the side of the second straight portion 33 facing the hinge base 10 has a first gap with the hinge base 10, and the middle support piece 40 is located within the first gap.

[0050] In this technical solution, by setting the second straight portion 33 to have a first gap with the hinge base 10 when it is in the retracted state to accommodate the middle support piece 40, the risk of interference between the middle support piece 40 and the long support piece 30 during the opening and closing of the window sash 300 is reduced.

[0051] Please refer to Figure 9 and Figure 10 According to some embodiments of this application, when the hinge mechanism 100 is in the retracted state, in the thickness direction, the side of the middle support plate 40 facing the hinge base 10 abuts against the hinge base 10, and the side of the second straight portion 33 facing the hinge base 10 abuts against the side of the middle support plate 40 away from the hinge base 10.

[0052] In this technical solution, when the hinge is closed, the side of the middle support plate 40 facing the hinge base 10 abuts against the hinge base 10 in the thickness direction, and the side of the second straight portion 33 facing the hinge base 10 abuts against the side of the middle support plate 40 away from the hinge base 10. This allows the middle support plate 40 to support the second straight portion 33 when it is closed, reducing the risk of deformation of the second straight portion 33 and reducing the risk of the hinge mechanism 100 jamming due to prolonged closure.

[0053] Please refer to Figures 9-11 According to some embodiments of this application, in the thickness direction, the short support piece 60 is located on the side of the middle support piece 40 away from the hinge base 10, and the end of the second straight portion 33 facing the short support piece 60 is provided with a receiving groove; when the hinge mechanism 100 is in the retracted state, the short support piece 60 is received in the receiving groove.

[0054] In this technical solution, by accommodating the short support piece 60 in the receiving groove when it is in the retracted state, the volume of the hinge mechanism 100 is reduced in the retracted state, which is beneficial for hiding the hinge mechanism 100.

[0055] According to some embodiments of this application, in the thickness direction, the two sides of the short support piece 60 that are disposed opposite each other are flush with the two sides of the second straight portion 33 that are disposed opposite each other; when the hinge mechanism 100 is in the retracted state, in the thickness direction, the short support piece 60 is sandwiched between the middle support piece 40 and the window sash 300 mounting base 50.

[0056] In this technical solution, when the window is closed, the short support piece 60 is sandwiched between the middle support piece 40 and the window sash 300 mounting base 50 in the thickness direction, so that when the window is closed, the middle support piece 40 can support the window sash 300 mounting base 50 through the short support piece 60, which further reduces the risk of deformation of the second straight part 33 and further reduces the risk of the hinge mechanism 100 jamming due to prolonged closure.

[0057] Please refer to Figures 9-12According to some embodiments of this application, the window sash 300 mounting base 50 includes a third straight portion 51 and a second flange portion 52. One end of the third straight portion 51 is hinged to the end of the second straight portion 33 away from the first flange portion 32, and the third straight portion 51 is used to support the bottom frame of the window sash 300; the second flange portion 52 is folded from one side of the third straight portion 51 toward the hinge base 10; when the hinge mechanism 100 is in the retracted state, the second flange portion 52 abuts against the side of the short support piece 60 away from the long support piece 30.

[0058] In this technical solution, by setting a second folding part, the positions of the long support piece 30, the middle support piece 40, the window sash 300 mounting base 50 and the short support piece 60 are limited when the window sash 300 is closed, thereby reducing the risk of excessive rotation of the window sash 300.

[0059] Please refer to Figure 6 and Figure 7 Please refer to Figure 12 According to some embodiments of this application, the side frame of the window sash 300 is provided with a third snap-fit ​​groove 310, and the mounting base 50 of the window sash 300 also includes a second snap-fit ​​part 53. The second snap-fit ​​part 53 protrudes from the side of the third straight part 51 away from the hinge base 10 and is used to snap-fit ​​with the third snap-fit ​​groove 310.

[0060] In this technical solution, the second snap-fit ​​part 53 is provided to facilitate the positioning and fixing of the window sash 300 mounting base 50 and the window sash 300.

[0061] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0062] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hinge mechanism, wherein a window sash is rotatably mounted on a window frame via the hinge mechanism, characterized in that, The hinge mechanism includes: A hinge base is installed on the bottom edge of the window frame. The hinge base has a first end and a second end that are arranged opposite each other in its length direction. The first end is closer to the junction line of the bottom edge and the side edge of the window frame than the second end. A slider is slidably disposed on the hinge base along the length direction and located between the first end and the second end; A long support piece, one end of which is hinged to the second end; The middle support plate is hinged at one end to the slider, and the middle part of the long support plate is hinged to the middle part of the middle support plate. The window sash mounting base is hinged at one end to the other end of the long support piece; The short support piece is hinged at both ends to the other end of the middle support piece and the window sash mounting base, respectively.

2. The hinge mechanism according to claim 1, characterized in that, The hinge base is provided with a sliding groove extending along the length direction, and the hinge mechanism further includes: A limiting block is adjustablely disposed within the slide groove along the length direction, dividing the slide groove into a first sub-segment located between the first end and the limiting block. The slider is slidably disposed within the first sub-segment, and the limiting block moves along the length direction to adjust the length of the first sub-segment.

3. A hinge mechanism according to claim 2, characterized in that, The groove extends through the hinge base along its thickness direction, and the hinge mechanism further includes: The first screw is provided on the limiting block, and the first screw passes through the first mounting hole and is inserted into the bottom edge of the window frame to releasably fix the limiting block in the slide groove.

4. A hinge mechanism according to any one of claims 1-3, characterized in that, The side frame of the window frame is provided with a first snap-fit ​​groove, the bottom frame of the window frame is provided with a second snap-fit ​​groove, and the first end is provided with a first snap-fit ​​part, which is used to snap-fit ​​with the first snap-fit ​​groove. The hinge mechanism further includes: A locking piece is detachably disposed on the side of the hinge base opposite to the long support piece, and the locking piece is used to engage with the second locking groove.

5. A hinge mechanism according to any one of claims 1-3, characterized in that, The long support piece includes a first straight part, a first flanged part and a second straight part connected in sequence. The end of the first straight part away from the first flanged part is hinged to the hinge base, and the end of the second straight part away from the first flanged part is hinged to the window sash mounting base. When the hinge mechanism is in the retracted state, in the thickness direction of the hinge base, the side of the first straight portion facing the hinge base abuts against the hinge base, and the side of the second straight portion facing the hinge base has a first gap with the hinge base, and the middle support plate is located within the first gap.

6. A hinge mechanism according to claim 5, characterized in that, When the hinge mechanism is in the retracted state, in the thickness direction, the side of the middle support plate facing the hinge base abuts against the hinge base, and the side of the second straight portion facing the hinge base abuts against the side of the middle support plate away from the hinge base.

7. A hinge mechanism according to claim 5, characterized in that, In the thickness direction, the short support piece is located on the side of the middle support piece away from the hinge base, and a receiving groove is provided at the end of the second straight portion facing the short support piece; When the hinge mechanism is in the retracted state, the short support piece is accommodated in the receiving groove.

8. A hinge mechanism according to claim 7, characterized in that, In the thickness direction, the two sides of the short support piece that are disposed opposite to each other are flush with the two sides of the second straight portion that are disposed opposite to each other; When the hinge mechanism is in the retracted state, the short support piece is sandwiched between the middle support piece and the window sash mounting base in the thickness direction.

9. A hinge mechanism according to claim 7 or 8, characterized in that, The window sash mounting base includes: The third straight section has one end hinged to the end of the second straight section away from the first flange section, and the third straight section is used to support the bottom frame of the window sash. The second flange folds from one side of the third straight portion toward the hinge base; When the hinge mechanism is in the retracted state, the second flange abuts against the side of the short support piece away from the long support piece.

10. A hinge mechanism according to claim 9, characterized in that, The side frame of the window sash is provided with a third snap-fit ​​groove, and the window sash mounting base also includes: The second snap-fit ​​portion protrudes from the side of the third straight portion away from the hinge base and is used to snap into the third snap-fit ​​groove.

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