inwardly opening inwardly tilting lower hinge

Abstract

The application discloses a kind of inner opening inner reverse lower hinge, including the frame fixing part being connected with the frame of door and window, the fan fixing part being connected with the fan of door and window, the first supporting arm being connected frame fixing part and fan fixing part and the rotating shaft being arranged on the first supporting arm, the first end of first supporting arm is pivoted with frame fixing part, the second end is equipped with swing groove, the rotating end of rotating shaft is pivoted with fan fixing part, swing end includes swing bar, upper stopper and lower stopper being connected at swing bar both ends respectively, swing bar is equipped swing groove, swing bar can swing between the first side wall and the second side wall of swing groove, first side wall is the side of swing groove away from swing bar and is inclined, second side wall is the side of swing groove opposite to first side wall, upper stopper is located swing bar side close to first side wall, lower stopper is located close to second side wall side, when rotating shaft is in inner opening state, the bottom surface of upper stopper and the top of first supporting arm abut, the top surface of lower stopper and the bottom of first supporting arm abut. With the characteristics of high load-bearing and stability.

Description

Technical Field

[0001] This invention relates to the field of door and window accessories technology, and in particular to an inward-opening and inward-tilting hinge. Background Technology

[0002] Inward-opening and tilt-and-turn windows (also known as casement windows with bottom awnings) combine two opening modes: inward opening and tilt-and-turn for micro-ventilation. They also offer excellent sealing performance when fully locked, making them widely used in mid-to-high-end building windows and doors in China. This type of window uses a set of linked hardware mechanisms; simply turning a single handle on the interior side allows switching between three working states: fully closed and locked, inward opening, and top tilt-and-turn for limited ventilation.

[0003] When implementing the tilt-in function, the lower hinge not only serves as a pivot support for the window sash but is also a key load-bearing component that withstands the weight of the window sash. A typical tilt-in lower hinge structure includes: a frame fastener fixed to the window frame, a sash fastener fixed to the window sash, and a support arm connecting the two. The two ends of the support arm are hinged to the frame fastener and the sash fastener, respectively, and the support arm is equipped with a pivot that rotates in conjunction with the sash fastener.

[0004] Currently, there are two main technical approaches to achieving the inward tilting function in the lower hinge: Firstly, using a support arm as the active swinging component, the support arm can swing relative to the window frame, while the pivot and support arm are fixed relative to each other, causing the window sash to tilt. In this type of design, when the window sash is in the casement position, the support arm cannot effectively bear the vertical gravity load of the window sash, resulting in insufficient load-bearing capacity of the lower hinge, making the window sash prone to sagging deformation.

[0005] Secondly, using a pivot as the active swinging component, the support arm remains fixed relative to the window frame, while the pivot can swing relative to the frame, thus driving the window sash to tilt. In the casement state, although the support arm can bear the weight of the window sash, the pivot lacks an effective limiting constraint structure, making it prone to radial wobbling during opening. Due to assembly and manufacturing tolerances between the hinge and the window sash, the window sash often exhibits significant wobbling when open, severely weakening its stability. After prolonged repetitive operation, window sash sagging is also difficult to avoid.

[0006] In summary, the existing lower hinge structure of inward-opening and tilt-and-turn windows has shortcomings in terms of load-bearing capacity and structural stability, making it difficult to meet the increasingly demanding requirements for doors and windows. Therefore, it is necessary to improve the existing lower hinge structure to solve the above problems. Summary of the Invention

[0007] In order to overcome at least one of the defects described in the prior art, the present invention provides an inwardly opening and inwardly tilting lower hinge, which improves the load-bearing capacity and structural stability of the lower hinge by optimizing the connection structure between the pivot and the support arm.

[0008] The technical solution adopted by this invention to solve its problem is: An inward-opening and inward-tilting hinge, comprising: Frame fasteners, which connect to the frame of doors and windows; A sash fastener, which connects to the sash body of a door or window; The first support arm has its first end pivotally connected to the frame fixing member, and its second end is provided with a swing groove; The rotating shaft has a rotating end at one end and an oscillating end at the other end. The rotating end is pivotally connected to the fan fixing component, and the oscillating end includes a swing rod, an upper abutment and a lower abutment respectively connected to both ends of the swing rod. The swing arm passes through a swing groove and is configured to swing between the first sidewall and the second sidewall of the swing groove. The first sidewall is the side of the swing groove that is inclined away from the swing arm, and the second sidewall is the side of the swing groove that is opposite to the first sidewall. The upper abutment is located on the side of the swing arm that is close to the first sidewall, and the lower abutment is located on the side that is close to the second sidewall. When the pivot is in the inward opening state, the bottom surface of the upper abutment abuts against the top of the first support arm, and the top surface of the lower abutment abuts against the bottom of the first support arm.

[0009] The inward-opening and inward-tilting hinge of this application achieves the inward tilting of the door / window through the swing of the pivot. The first support arm remains horizontal and does not tilt in either the open or tilted-in state. Furthermore, an upper and lower abutment are provided at the swing end of the pivot, positioned on opposite sides of the swing end along an inclined direction. In the open state, the upper abutment abuts against the top of the first support arm, and the lower abutment abuts against the bottom of the first support arm, thus limiting the tilting of the pivot in the open state. This ensures the pivot remains perpendicular to the first support arm, and in the open state, the first support arm is only subjected to axial pressure along the pivot, without radial tension or torque, thereby reducing the load on the second end of the first support arm and increasing the overall load-bearing capacity of the lower hinge. Since the upper and lower abutments are positioned on opposite sides of the swing end along an inclined direction, they do not interfere with the tilting of the pivot in the tilted-in state.

[0010] As an optional implementation, the length of the end protruding swing arm of the upper abutment is greater than the length of the end protruding swing arm of the lower abutment.

[0011] By adopting the above technical solution, if the shaft is subjected to a lateral (radial) force, it will tend to tilt in the opposite direction of the lateral force. The tilting "fulcrum" (center of rotation) is located at the outermost edge of the upper abutment. By setting the length of the upper abutment to be greater than the length of the lower abutment, the lever arm between the "fulcrum" and the lower abutment can be extended. According to the lever principle, the longer the lever arm, the smaller the reverse thrust required by the lower abutment. This reduces the load on the lower abutment, allowing its size to be reduced accordingly for easier processing and assembly. In addition, the increased length of the upper abutment increases the contact area between the upper abutment and the first support arm, which can disperse the contact pressure and ensure long-term structural stability.

[0012] As an optional implementation, the upper abutment protrudes from the swing arm on both the side near the first end of the first support arm and the side near the second end of the first support arm.

[0013] By adopting the above technical solution, the upper abutment protrudes towards the side of the swing arm, which can increase the contact area between the upper abutment and the first support arm, improve the structural strength of the upper abutment, and effectively prevent the first support arm from deforming or fatigued due to long-term local pressure.

[0014] As an alternative implementation, the length of the upper abutment on the side near the first end of the first support arm is greater than the length on the side near the second end of the first support arm.

[0015] By adopting the above technical solution, the first end of the upper abutment near the first support arm is lengthened, which can also lengthen the lateral tilt "fulcrum" and the lever arm length of the lower abutment, thereby reducing the load on the lower abutment. At the same time, the "fulcrum" can be brought closer to the end of the first support arm that is connected to the frame fixing member, improving the stress situation of the first support arm.

[0016] As an optional implementation, a support portion is provided on the first sidewall. The support portion is located at one end of the first sidewall near the upper abutment. When the pivot is in the inverted state, the swing arm and / or the upper abutment are at least partially in contact with the support portion.

[0017] By adopting the above technical solution, in the inverted state, the swing arm and / or the upper abutment contact the support surface, which can increase the contact area between the swing end and the first support arm and improve the load-bearing performance of the lower hinge.

[0018] As an optional implementation, the second sidewall is provided with a first inclined portion, which extends inclinedly from the top of the first support arm toward the first sidewall. When the pivot is in the inverted state, the swing arm is at least partially in contact with the first inclined portion.

[0019] By adopting the above technical solution, the first inclined part makes the size of the swing groove near the top of the first support arm larger than the size of the swing rod, thus reserving space for the swing rod to swing.

[0020] As an optional implementation, the first sidewall is also provided with a second inclined portion, one end of which is connected to the support portion, and the other end extends in a direction away from the second sidewall, and the second inclined portion is arranged parallel to the first inclined portion.

[0021] By adopting the above technical solution, when the rotating shaft is in the inverted state, the first inclined part and the second inclined part abut against the opposite sides of the swing arm, which can improve the stress situation of the first support arm and the rotating shaft.

[0022] As an optional implementation, the tilt angle of the first tilting portion is greater than or equal to the inward tilt angle of the rotating shaft.

[0023] By adopting the above technical solution, this setting can limit the tilting amplitude of the pendulum and avoid interference from the first tilting part on the tilting of the pendulum.

[0024] As an optional implementation, the lower stop and the swing arm are integrally formed.

[0025] By adopting the above technical solution, the structural strength of the shaft can be improved, thereby enhancing the load-bearing capacity of the shaft.

[0026] As an optional implementation, a vertical portion is also provided in the lower middle part of the second sidewall, one end of which is connected to the first inclined portion, and the other end extends vertically to the bottom of the first support arm.

[0027] By adopting the above technical solution, the vertical part can avoid the formation of sharp corners at the bottom of the second sidewall, thereby preventing the bottom of the second sidewall from breaking due to stress concentration, thus ensuring the structural reliability of the lower abutment and the first support arm in the open state. In addition, when the rotating shaft is assembled with the first support arm, the vertical part can provide clearance for the lower abutment, so that the rotating shaft can be assembled in the swing groove.

[0028] As an optional implementation, a clearance angle is provided at one end of the swing arm near the lower stop, and the clearance angle is located on the side of the swing arm away from the lower stop.

[0029] By adopting the above technical solution, when the swing end of the rotating shaft is inserted into the swing groove, the clearance angle can avoid interference between the bottom of the swing rod and the first side wall, so as to facilitate the assembly of the rotating shaft and the first support arm.

[0030] As an optional implementation, a bushing is provided on the fan fixing component, and the bushing is rotatably engaged with the rotating end.

[0031] By adopting the above technical solution, the bushing can limit the radial swing of the pivot and the sash fixing component, ensuring that when the door and window sash is in the open state, the pressure applied to the pivot is along the axis of the pivot, thereby reducing the load on the first support arm and increasing the load-bearing capacity of the lower hinge.

[0032] As an optional implementation, a first anti-rotation surface is provided in the swing groove, and a second anti-rotation surface corresponding to the first anti-rotation surface is provided on the swing rod.

[0033] By adopting the above technical solution, the first anti-rotation surface and the second anti-rotation surface cooperate to restrict the swing rod from rotating circumferentially in the swing groove, thereby ensuring the accuracy of the assembly of the rotating shaft and the swing groove.

[0034] As an optional implementation, it also includes a second support arm, one end of which is pivotally connected to the frame fixing member, the other end of which is pivotally connected to the sash fixing member, and the middle part of the second support arm is pivotally connected to the first support arm.

[0035] By adopting the above technical solution, the first support arm and the second support arm jointly bear the weight of the door and window sash, further improving the overall load-bearing capacity of the lower hinge.

[0036] In summary, the inward-opening and inward-tilting hinge provided by this invention has the following technical effects: The inward-opening and tilt-down hinge of this application achieves the inward tilting state of the door / window sash through the swing of the pivot, ensuring that the support arm remains horizontal and does not tilt in the open state, thereby better supporting the weight of the door / window sash. Furthermore, in the open state, the cooperation of the upper and lower abutments, along with the axial restraint of the bushing, ensures that the pivot remains vertical. Thus, the pressure applied to the first support arm by the pivot is along the axial direction of the pivot, reducing the load on the end of the first support arm and increasing the overall load-bearing capacity of the hinge. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments 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.

[0038] Figure 1 This is a schematic diagram of the structure of an inwardly opening and inwardly tilting hinge according to a preferred embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the internally opening and inwardly tilting hinge from another perspective; Figure 3 for Figure 2 The diagram shows the structure of the inward-opening and inward-tilting hinge with the fixing component of the middle fan separated from the pivot. Figure 4 for Figure 3 The diagram shows the structure of the pivot shaft and the first support arm in the inward-opening and inward-tilting hinge. Figure 5 for Figure 4The diagram shows the structure of the pivot and the first support arm from another perspective. Figure 6 for Figure 5 The diagram shows the structure of the first support arm and the swing groove. Figure 7 for Figure 4 The diagram shown is a structural schematic of the rotating shaft. Figure 8 for Figure 6 The diagram shows the structure of the swing groove; Figure 9 for Figure 3 The diagram shows the structure with the rotating shaft and the swing groove in a flat-open state. Figure 10 for Figure 3 The diagram shows the structure with the rotating shaft and the swing groove in an inverted state. Figure 11 This is a structural diagram illustrating the assembly process of the rotating shaft and the swing groove.

[0039] The meanings of the reference numerals in the attached figures are as follows: 100. Inward-opening and inward-tilting hinge; 10. Frame fixing component; 20. Fan fixing component; 21. Bushing; 30. First support arm; 31. First end; 32. Second end; 33. Swing groove; 331. First side wall; 3311. Support part; 3312. Second inclined part; 332. Second side wall; 3321. First inclined part; 3322. Vertical part; 333. First anti-rotation surface; 40. Rotating shaft; 41. Rotating end; 42. Swinging end; 421. Swing rod; 4211. Clearance angle; 4212. Second anti-rotation surface; 422. Upper abutment; 423. Lower abutment; 50. Second support arm; 60. First connecting rod; 70. Second connecting rod. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0042] Furthermore, some of the aforementioned terms, besides indicating direction or positional relationships, may also have other meanings. For example, the term "above" may, in certain circumstances, indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0043] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0044] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0045] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0046] See Figures 1 to 11 This invention discloses an inward-opening and inward-tilting hinge 100, comprising a frame fixing member 10 connected to the frame of a door or window, a sash fixing member 20 connected to the sash of the door or window, a first support arm 30 connecting the frame fixing member 10 and the sash fixing member 20, and a rotating shaft 40 disposed on the first support arm 30. The first end 31 of the first support arm 30 is pivotally connected to the frame fixing member 10, and the second end 32 is provided with a swing groove 33. One end of the rotating shaft 40 is a rotating end 41, and the other end is a swing end 42. The rotating end 41 is pivotally connected to the sash fixing member 20, and the swing end 42 is movably connected to the swing groove 33. The swing end 42 is configured to be perpendicular to the first support arm 30 in the open state and inclined to the first support arm 30 in the inward-tilting state. The inward-opening and tilt-and-turn lower hinge 100 of this application improves the load-bearing capacity and structural stability of the lower hinge by optimizing the connection structure between the pivot 40 and the first support arm 30. This solves the problem that the existing lower hinge structure of inward-opening and tilt-and-turn windows is insufficient in terms of load-bearing capacity and structural stability, making it difficult to meet the increasingly demanding requirements for door and window use.

[0047] like Figure 7 and Figure 8As shown, specifically, the swing end 42 of the rotating shaft 40 includes a swing rod 421, an upper abutment 422 and a lower abutment 423 respectively connected to both ends of the swing rod 421; wherein, the swing rod 421 passes through the swing groove 33, and the swing rod 421 is configured to swing between the first sidewall 331 and the second sidewall 332 of the swing groove 33, the first sidewall 331 being the side of the swing groove 33 inclined away from the swing rod 421, and the second sidewall 332 being the area between the swing groove 33 and the first sidewall. On the opposite side of 331, the upper abutment 422 is located on the side of the swing arm 421 near the first side wall 331, and the lower abutment 423 is located on the side near the second side wall 332. When the pivot 40 is in the inward opening state, the bottom surface of the upper abutment 422 abuts against the top of the first support arm 30, and the top surface of the lower abutment 423 abuts against the bottom of the first support arm 30. That is, the distance between the bottom surface of the upper abutment 422 and the top surface of the lower abutment 423 is equal to the thickness of the first support arm 30. By providing an upper abutment 422 and a lower abutment 423 at the swing end 42 of the pivot 40, with the upper abutment 422 and lower abutment 423 respectively arranged on opposite sides of the swing end 42 along an inclined direction, in the open state, the upper abutment 422 abuts against the top of the first support arm 30, and the lower abutment 423 abuts against the bottom of the first support arm 30, thereby restricting the pivot 40 from tilting in the open state. This keeps the pivot 40 perpendicular to the first support arm 30, ensuring that the first support arm 30 is only subjected to axial pressure along the pivot 40 in the open state, and not to radial tension or torque, thus reducing the load on the second end 32 of the first support arm 30. This increases the overall load-bearing capacity of the lower hinge. Since the upper abutment 422 and lower abutment 423 are respectively arranged on opposite sides of the swing end 42 along an inclined direction, in the inward tilting state, the upper abutment 422 and lower abutment 423 will not interfere with the tilting of the pivot 40.

[0048] In addition to sharing the pressure on the door and window sash and cooperating with the lower abutment 423 to keep the pivot 40 perpendicular to the first support arm 30 in the open state, the upper abutment 422 can support the sash fixing member 20 and the door and window sash and separate the sash fixing member 20 from the first support arm 30, so as to avoid interference between the sash fixing member 20 and the door and window sash and the first support arm 30, and ensure that the door and window can smoothly perform opening, closing and tilting actions.

[0049] To reduce the load on the lower abutment 423, in one specific embodiment, the length of the end of the upper abutment 422 protruding from the swing rod 421 is greater than the length of the end of the lower abutment 423 protruding from the swing rod 421. It should be noted that in this embodiment, the end of the upper abutment 422 refers to the end away from the swing rod 421 in the direction of its swing; correspondingly, the end of the lower abutment 423 refers to the end away from the swing rod 421 in the direction of its swing. If the shaft 40 is subjected to a lateral (radial) force, it will tend to tilt in the opposite direction of the lateral force. The "fulcrum" (center of rotation) of the tilting will be located at the outermost edge of the upper abutment 422. By setting the length of the upper abutment 422 to be greater than the length of the lower abutment 423, the lever arm between the "fulcrum" and the lower abutment 423 can be extended. According to the lever principle, the longer the lever arm, the smaller the reverse thrust required by the lower abutment 423. This reduces the load on the lower abutment 423, allowing its size to be reduced accordingly for easier processing and assembly. In addition, the increased length of the upper abutment 422 increases the contact area between the upper abutment 422 and the first support arm 30, which can disperse the contact pressure and ensure long-term structural stability.

[0050] Furthermore, the upper abutment 422 protrudes from the rocker arm 421 on both the side near the first end 31 of the first support arm 30 and the side near the second end 32 of the first support arm 30. The upper abutment 422 protruding towards the side of the rocker arm 421 increases the contact area between the upper abutment 422 and the first support arm 30, thereby improving the structural strength of the upper abutment 422 and effectively preventing the first support arm 30 from deforming or fatigued due to prolonged local pressure.

[0051] Furthermore, the length of the upper abutment 422 near the first end 31 of the first support arm 30 is greater than the length near the second end 32 of the first support arm 30. The extended length of the upper abutment 422 near the first end 31 of the first support arm 30 also lengthens the lever arm length of the laterally inclined "fulcrum" and the lower abutment 423, thereby reducing the load on the lower abutment 423. Simultaneously, it brings the "fulcrum" closer to the end of the first support arm 30 connected to the frame fixing member 10, improving the stress distribution on the first support arm 30.

[0052] like Figure 8 and Figure 9 As shown, a support portion 3311 is provided on the first sidewall 331. The support portion 3311 is located at one end of the first sidewall 331 near the upper abutment 422. When the pivot 40 is in the inward tilting state, the swing arm 421 and / or the upper abutment 422 are at least partially in contact with the surface of the support portion 3311. In the inward tilting state, the contact between the swing arm 421 and / or the upper abutment 422 and the surface of the support portion 3311 can increase the contact area between the swing end 42 and the first support arm 30, thereby improving the load-bearing capacity of the lower hinge.

[0053] In this embodiment, the support portion 3311 is an arc-shaped surface extending from the top of the first support arm 30 to the middle of the first sidewall 331. Correspondingly, the connection between the upper abutment 422 and the swing rod 421 is provided with an arc-shaped surface corresponding to the support portion 3311. This arc-shaped surface, on the one hand, allows the upper abutment 422 and the swing rod 421 to form surface contact with the first sidewall 331 when in the inverted state, thereby improving the load-bearing capacity; on the other hand, this arc-shaped surface allows the connection between the upper abutment 422 and the swing rod 421 to have an arc-shaped transition, avoiding stress concentration and improving the structural strength of the upper abutment 422 and the swing rod 421. In other embodiments, the support portion 3311 may also be an inclined plane or other curved surface. Correspondingly, setting the parts of the upper abutment 422 and / or the swing rod 421 corresponding to the support portion 3311 to form a structure that makes surface contact with the support portion 3311 can also achieve the purpose of improving the load-bearing capacity.

[0054] In one specific embodiment, in order to reserve swing space for the swing arm 421 within the swing groove 33, a first inclined portion 3321 is provided on the second side wall 332. The first inclined portion 3321 extends inclinedly from the top of the first support arm 30 toward the first side wall 331. When the pivot 40 is in the inward tilting state, the swing arm 421 is at least partially in contact with the first inclined portion 3321. The first inclined portion 3321 makes the dimension of the swing groove 33 near the top of the first support arm 30 larger than the dimension of the swing arm 421, thus reserving space for the swing arm 421 to swing.

[0055] Correspondingly, the first sidewall 331 is also provided with a second inclined portion 3312. One end of the second inclined portion 3312 is connected to the support portion 3311, and the other end extends away from the second sidewall 332. The second inclined portion 3312 is arranged parallel to the first inclined portion 3321. When the pivot 40 is in the inward tilting state, the first inclined portion 3321 and the second inclined portion 3312 abut against the opposite sides of the swing arm 421, which can improve the stress situation of the first support arm 30 and the pivot 40.

[0056] Optionally, the tilt angle of the first tilting portion 3321 is greater than or equal to the inward tilt angle of the rotating shaft 40. This setting can limit the tilt amplitude of the swing arm 421 and avoid interference from the first tilting portion 3321 to the tilt of the swing arm 421. When the tilt angle of the first tilting portion 3321 is equal to the inward tilt angle of the rotating shaft 40, the angles of the first tilting portion 3321 and the second tilting portion 3312 should be equal. The cooperation of the two can limit the swing angle of the rotating shaft 40, and the side wall of the swing arm 421 fits against the first tilting portion 3321 and the second tilting portion 3312, which can increase the contact area between the rotating shaft 40 and the swing groove 33, thereby reducing the load on the swing groove 33 and extending its service life. When the angle of the first tilting portion 3321 is greater than the swing angle of the rotating shaft 40, an additional limiting structure is required, such as limiting the swing angle of the rotating shaft 40 by the second tilting portion 3312. In this case, the angle of the second tilting portion 3312 is not equal to the angle of the first tilting portion 3321.

[0057] Optionally, a vertical portion 3322 is also provided in the lower middle part of the second sidewall 332. One end of the vertical portion 3322 is connected to the first inclined portion 3321, and the other end extends vertically to the bottom of the first support arm 30. The vertical portion 3322 can prevent sharp corners from forming at the bottom of the second sidewall 332, thereby preventing the bottom of the second sidewall 332 from breaking due to stress concentration, thus ensuring the structural reliability of the lower abutment 423 and the first support arm 30 in the open state. In addition, with the lower abutment 423 and the swing rod 421 integrally formed, when the rotating shaft 40 is assembled with the first support arm 30, the vertical portion 3322 can provide clearance for the lower abutment 423, so that the rotating shaft 40 can be assembled in the swing groove 33.

[0058] In this embodiment, the lower abutment 423 and the swing arm 421 are integrally formed. This can improve the structural strength of the rotating shaft 40, thereby improving the load-bearing capacity of the rotating shaft 40.

[0059] Correspondingly, to facilitate the insertion of the rotating shaft 40 into the swing groove 33, a clearance angle 4211 is provided at the end of the swing rod 421 near the lower abutment 423. The clearance angle 4211 is located on the side of the swing rod 421 away from the lower abutment 423. When the swing end 42 of the rotating shaft 40 is inserted into the swing groove 33, the clearance angle 4211 can prevent the bottom of the swing rod 421 from interfering with the first side wall 331, so as to facilitate the assembly of the rotating shaft 40 and the first support arm 30.

[0060] like Figure 11As shown, when assembling the rotating shaft 40 and the swing groove 33, the swing end 42 of the rotating shaft 40 is tilted and placed into the swing groove 33, so that the end of the lower abutment 423 is in contact with the first inclined part 3321. When the lower abutment 423 enters the vertical part 3322, the rotating shaft 40 can be slightly swung towards the upper abutment 422 at a certain angle so that the lower abutment 423 can pass through the swing groove 33. Since the side of the swing rod 421 away from the lower abutment 423 is provided with an clearance angle 4211, interference between the swing rod 421 and the second inclined part 3312 is avoided during assembly, ensuring that the lower abutment 423 can pass smoothly through the swing groove 33. After the lower abutment 423 passes through the swing groove 33, the rotating shaft 40 can be stood upright and perpendicular to the first support arm 30, thus completing the assembly of the rotating shaft 40 and the swing groove 33.

[0061] In this embodiment, the clearance angle 4211 is a chamfered angle. In other embodiments, the clearance angle 4211 can also be set as a concave arc angle or a stepped angle, as long as it can achieve the purpose of clearance when the rotating shaft 40 and the swing groove 33 are assembled.

[0062] In this embodiment, both the lower abutment 423 and the upper abutment 422 are integrally formed with the swing rod 421 by forging. This ensures the structural strength of the rotating shaft 40 and improves its load-bearing capacity. Integral forming means that the rotating shaft 40 can be machined as a whole in one go and then assembled. Alternatively, the swing rod 421 and the upper abutment 422 can be pre-formed, and after the swing rod 421 is assembled with the swing groove 33, the lower abutment 423 is formed onto the swing rod 421 by riveting or upsetting.

[0063] In other embodiments, provided that the design load-bearing requirements are met, the lower abutment 423, the upper abutment 422, and the swing rod 421 can be configured as separate structures, which facilitates the assembly of the rotating shaft 40 and the swing groove 33. For example, the shaft body of the rotating shaft 40 (including the rotating end 41 and the swing rod 421), the lower abutment 423, and the upper abutment 422 can be manufactured separately first. Then, after the shaft body of the rotating shaft 40 passes through the swing groove 33, the lower abutment 423 and the upper abutment 422 can be connected to the shaft body by one or more methods such as threaded connection, welding, insertion, and snap-fit. Alternatively, the upper abutment 422 can be integrally formed on the shaft body of the rotating shaft 40 first, and then the lower abutment 423 can be formed separately. After the shaft body of the rotating shaft 40 passes through the swing groove 33, the lower abutment 423 can be connected to the shaft body by one or more methods such as threaded connection, welding, insertion, and snap-fit. To improve the assembly accuracy between the rotating shaft 40 and the swing groove 33, a first anti-rotation surface 333 is provided in the swing groove 33, and a second anti-rotation surface 4212 corresponding to the first anti-rotation surface 333 is provided on the swing rod 421. By utilizing the cooperation of the first anti-rotation surface 333 and the second anti-rotation surface 4212, the circumferential rotation of the swing rod 421 within the swing groove 33 can be restricted, thereby ensuring the accuracy of the assembly between the rotating shaft 40 and the swing groove 33.

[0064] In this embodiment, there are two first anti-rotation surfaces 333, which are arranged opposite to each other and respectively located on the adjacent side of the first sidewall 331 and the second sidewall 332. Correspondingly, two second anti-rotation surfaces 4212 are provided on the swing rod 421, respectively located on the adjacent side of the swing rod 421 and the upper stop 422 and the lower stop 423. In other embodiments, only one first anti-rotation surface 333 may be provided, and correspondingly, one second anti-rotation surface 4212 may also be provided on the swing rod 421.

[0065] like Figure 1 and Figure 2 As shown, to further limit the radial swing of the pivot 40 and the sash fixing member 20, in one specific embodiment, a bushing 21 is provided on the sash fixing member 20, and the bushing 21 is rotatably engaged with the rotating end 41. The bushing 21 can limit the radial swing of the pivot 40 and the sash fixing member 20, ensuring that in the casement state, the pressure applied to the door and window sash by the pivot 40 is along the axial direction of the pivot 40, thereby reducing the load on the first support arm 30 and increasing the load-bearing capacity of the lower hinge.

[0066] The inward-opening and tilting hinge 100 of this application also includes a second support arm 50. One end of the second support arm 50 is pivotally connected to the frame fixing member 10, and the other end is pivotally connected to the sash fixing member 20. The middle part of the second support arm 50 is pivotally connected to the first support arm 30. The first support arm 30 and the second support arm 50 jointly bear the weight of the door and window sash, further improving the overall load-bearing capacity of the lower hinge.

[0067] In order to further improve the load-bearing capacity of the first support arm 30, the hinge point of the second support arm 50 and the first support arm 30 is close to the swing groove 33, so that the second support arm 50 can share the load of the first support arm 30.

[0068] The inward-opening and inward-tilting hinge 100 of this application also includes a first link 60 and a second link 70. One end of the first link 60 is pivotally connected to the frame fixing member 10, and the other end is pivotally connected to the first end 31 of the first support arm 30. One end of the second link 70 is pivotally connected to the sash fixing member 20, and the other end is pivotally connected to the second support arm 50. The first link 60 and the second link 70 can increase the opening and closing angle of the hinge. At the same time, in cooperation with the first support arm 30, the second support arm 50 and other structures, they enhance the structural strength and load-bearing capacity of the hinge, and participate in the switching of the lower hinge in various working states.

[0069] The inward-opening and tilting hinge 100 of this application achieves the inward tilting state of the door / window sash by swinging the pivot 40, ensuring that the support arm remains horizontal in the open state without tilting, thus better supporting the weight of the door / window sash. Furthermore, in the open state, the upper and lower abutments 422 and the axial restraint of the bushing 21 ensure that the pivot 40 remains vertical. Thus, the pressure applied by the pivot 40 to the first support arm 30 is along the axial direction of the pivot 40, reducing the load on the end of the first support arm 30 and increasing the overall load-bearing capacity of the hinge.

[0070] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. An inwardly opening and inwardly tilting hinge, characterized in that: include: Frame fastener (10), which is connected to the frame of the door and window; A sash fastener (20) is connected to the sash body of the door or window; The first support arm (30) has its first end (31) pivotally connected to the frame fixing member (10), and its second end (32) is provided with a swing groove (33). The rotating shaft (40) has a rotating end (41) at one end and a swing end (42) at the other end. The rotating end (41) is pivotally connected to the fan fixing member (20). The swing end (42) includes a swing rod (421), an upper abutment (422) and a lower abutment (423) respectively connected to the two ends of the swing rod (421). The swing rod (421) passes through the swing groove (33). The swing rod (421) is configured to swing between the first sidewall (331) and the second sidewall (332) of the swing groove (33). The first sidewall (331) is the side of the swing groove (33) that is inclined away from the swing rod (421). The second sidewall (332) is the side of the swing groove (33) that is opposite to the first sidewall (331). The upper abutment (422) is located on the side of the swing rod (421) that is close to the first sidewall (331). The lower abutment (423) is located on the side that is close to the second sidewall (332). When the rotating shaft (40) is in the inward opening state, the bottom surface of the upper abutment (422) abuts against the top of the first support arm (30), and the top surface of the lower abutment (423) abuts against the bottom of the first support arm (30).

2. The inward-opening and inward-tilting hinge according to claim 1, characterized in that: The length of the end protruding swing rod (421) of the upper abutment (422) is greater than the length of the end protruding swing rod (421) of the lower abutment (423).

3. The inward-opening, inward-tilting hinge according to claim 1, characterized in that: The upper abutment (422) protrudes from the swing arm (421) on both the side near the first end (31) of the first support arm (30) and the side near the second end (32) of the first support arm (30).

4. The inwardly opening and inwardly tilting hinge according to claim 3, characterized in that: The length of the upper abutment (422) near the first end (31) of the first support arm (30) is greater than the length near the second end (32) of the first support arm (30).

5. The inwardly opening and inwardly tilting hinge according to claim 1, characterized in that: The first sidewall (331) is provided with a support part (3311), which is located at one end of the first sidewall (331) near the upper abutment (422). When the rotating shaft (40) is in the inverted state, the swing rod (421) and / or the upper abutment (422) are at least partially in contact with the surface of the support part (3311).

6. The inwardly opening and inwardly tilting hinge according to claim 5, characterized in that: The second sidewall (332) is provided with a first inclined portion (3321), which extends inclinedly from the top of the first support arm (30) toward the first sidewall (331). When the pivot (40) is in the inverted state, the swing rod (421) is at least partially in contact with the first inclined portion (3321).

7. The inwardly opening and inwardly tilting hinge according to claim 6, characterized in that: The first sidewall (331) is also provided with a second inclined portion (3312), one end of which is connected to the support portion (3311), and the other end extends away from the second sidewall (332), and the second inclined portion (3312) is arranged parallel to the first inclined portion (3321).

8. The inward-opening and inward-tilting hinge according to claim 6, characterized in that: The tilt angle of the first tilting part (3321) is greater than or equal to the inward tilt angle of the rotating shaft (40).

9. The inward-opening and inward-tilting hinge according to claim 6, characterized in that: The lower abutment (423) and the swing arm (421) are integrally formed.

10. The inwardly opening and inwardly tilting hinge according to claim 9, characterized in that: The lower middle part of the second sidewall (332) is also provided with a vertical part (3322), one end of which is connected to the first inclined part (3321), and the other end extends vertically to the bottom of the first support arm (30).

11. The inward-opening, inward-tilting hinge according to claim 9, characterized in that: The swing arm (421) has a clearance angle (4211) at one end near the lower abutment (423), and the clearance angle (4211) is located on the side of the swing arm (421) away from the lower abutment (423).

12. The inwardly opening and inwardly tilting hinge according to claim 1, characterized in that: A bushing (21) is provided on the fan fixing member (20), and the bushing (21) is rotatably engaged with the rotating end (41).

13. The inwardly opening and inwardly tilting hinge according to claim 1, characterized in that: The swing groove (33) is provided with a first anti-rotation surface (333), and the swing rod (421) is provided with a second anti-rotation surface (4212) corresponding to the first anti-rotation surface (333).

14. The inwardly opening and inwardly tilting hinge according to claim 1, characterized in that: It also includes a second support arm (50), one end of which is pivotally connected to the frame fixing member (10), and the other end is pivotally connected to the sash fixing member (20). The middle part of the second support arm (50) is pivotally connected to the first support arm (30).

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