A folding door and window connecting mechanism and a folding door

Abstract

The application provides a folding door and window connecting mechanism, which comprises a door and window connecting piece, a first main connecting rod, a second main connecting rod, a first auxiliary connecting rod and a second auxiliary connecting rod. The first end of the first main connecting rod is connected with the door and window connecting piece through a sliding pair, the second end of the first main connecting rod is pivotally connected with the first end of the second main connecting rod, and the second end of the second main connecting rod is pivotally and slidably arranged on a door and window frame. The first end of the first auxiliary connecting rod is pivotally connected with the door and window connecting piece, the second end of the first auxiliary connecting rod is pivotally connected with the first end of the second auxiliary connecting rod, the second end of the second auxiliary connecting rod is pivotally connected with the second main connecting rod, and the four parts form a four-connecting-rod motion mechanism. The sliding pair enables the first end of the first main connecting rod to slide relative to the door and window connecting piece when the folding door is opened or closed, automatically compensates for the geometric relation difference caused by the width change of the door leaf, realizes generalization, avoids the motion interference of the connecting rods, simplifies the existing folding transformation process of the door body, reduces the transformation cost and construction period, and improves the construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of building door and window technology, and in particular to a folding door and window connection mechanism and a folding door. Background Technology

[0002] In the fields of architectural decoration and door and window design, folding doors have been widely used due to their unique advantages. Folding doors can easily achieve a large opening effect, greatly expanding the passage space, while they can be compactly folded when not in use, effectively saving indoor and outdoor space. They are especially suitable for places with high space utilization requirements, such as shopping malls, warehouses, and balconies.

[0003] Currently, most common folding door and window connection mechanisms employ four-bar linkages. These mechanisms typically have defined geometric dimensions, with fixed distances between their pivot points, which to a certain extent meet the basic requirements for smooth folding and unfolding of the door panels. For example, patent CN222976653U discloses a folding door and window connection device that uses door and window frame fixing components, two door and window panel connectors, and connecting rods to form an integrated four-bar linkage. The two movable output ends of this mechanism are fixedly connected to the two door panels respectively. This integrated four-bar linkage provides a relatively stable trajectory for the movement of the door panels, ensuring the smoothness of the folding door during opening and closing.

[0004] However, when this fixed-size four-bar linkage is applied to door panels of varying widths, significant problems arise. Due to the variation in door width, the length of the fixed link in the linkage may not match the geometry required for the actual movement of the door panel. During folding or unfolding, this can easily lead to motion interference between the links or between the links and the door panel, manifesting as jamming, sluggish operation, abnormal noises, or even the inability to fold or unfold completely. Therefore, traditional four-bar linkages are typically custom-designed for door panels of specific widths, lacking versatility. When retrofitting existing non-folding doors or adapting to non-standard door opening sizes, it is often necessary to redesign and manufacture the linkage, increasing costs and time. Summary of the Invention

[0005] The purpose of this invention is to disclose a folding door and window connection mechanism that can adaptively adapt to door panels of different widths, avoid motion interference, and is highly versatile.

[0006] To achieve the above objectives, the present invention discloses a folding door and window connection mechanism, comprising: a door and window connector for fixedly connecting to a first door / window sash of a folding door; a first main link, the first end of which is connected to the door and window connector via a sliding joint; a second main link, the first end of which is pivotally connected to the second end of the first main link, the second end of which is pivotally slidably mounted on a door / window frame; a first auxiliary link, the first end of which is pivotally connected to the door and window connector; and a second auxiliary link, the first end of which is pivotally connected to the second end of the first auxiliary link, the second end of which is pivotally connected to the second main link; wherein the first main link and the first auxiliary link are pivotally connected at a certain point between them, such that the first main link, the second main link, the first auxiliary link, and the second auxiliary link together constitute a four-bar linkage, and the sliding joint is configured to allow the first end of the first main link to slide along the door and window connector during the opening and closing of the folding door.

[0007] By adopting the above solution, during the opening and closing of the folding door, when the connecting mechanism drives door panels of different widths, the sliding pair allows the first end of the first main link to slide relative to the door and window connector. This sliding degree of freedom automatically compensates for the inherent geometrical differences in the four-bar linkage caused by variations in door panel width, allowing the same connecting mechanism to be directly applied to door panels of various widths without any adjustment, achieving universality and solving the problem that traditional four-bar linkages can only be customized for door panels of specific widths and have poor versatility. Because the sliding pair between the first main link and the door and window connector automatically compensates for the geometrical differences, it fundamentally avoids motion interference between links due to size mismatch. This solves the problem that traditional four-bar linkages are prone to motion interference between links or between links and door panels when applied to door panels of different widths, resulting in mechanism jamming, poor operation, abnormal noise, or even inability to fold or unfold completely. When modifying existing doors to be foldable, there is no need to customize the connecting mechanism according to the door panel size. Simply install the connecting mechanism of this invention in the standard way for direct use. This greatly simplifies the renovation process, reduces renovation costs and construction time, improves construction efficiency, and solves the problem that traditional four-bar linkage mechanisms often require redesigning and manufacturing of the connecting mechanism when renovating existing non-folding doors or adapting to non-standard door opening sizes, which increases costs and time.

[0008] Furthermore, the door and window connector is provided with a sliding groove along its length, and the sliding pair is the cooperation between the pulley or pivot located at the first end of the first main connecting rod and the sliding groove.

[0009] By adopting the above solution, the pulley or pivot slides flexibly and smoothly in the groove, which can more accurately realize the sliding of the first end of the first main link relative to the door and window connector, effectively compensate for the geometric relationship difference of the four-bar linkage caused by the change of door width, further ensure that the connection mechanism adapts to different door widths, avoids motion interference, ensures a smooth and stable opening and closing process of the folding door, and improves the user experience.

[0010] Furthermore, the total length of the door and window connector is L1, the effective length of the sliding groove is L2, and the following conditions are met: L1≥2×L2.

[0011] By adopting the above solution, on the one hand, it can ensure that the pulley or pivot at the first end of the first main connecting rod has sufficient and flexible sliding stroke in the sliding groove, which can better adapt to the geometric changes brought about by different widths of door panels and enhance the adaptive capability of the connecting mechanism; on the other hand, it provides a margin for installation and debugging, reduces the installation accuracy requirements, and even if there is a certain installation deviation, it can ensure that the sliding pair works normally, avoid motion interference, and ensure the stable and smooth operation of the folding door.

[0012] Furthermore, a first pivot point is provided on the first main connecting rod and the first auxiliary connecting rod, the distance L3 from the first pivot point to the first end of the first main connecting rod is greater than the distance L4 from the first pivot point to the second end of the first main connecting rod, and the distance L5 from the first pivot point to the first end of the first auxiliary connecting rod is less than or equal to the distance L6 from the first pivot point to the second end of the first auxiliary connecting rod.

[0013] By adopting the above solution, the force transmission and motion distribution of the four-bar linkage during the opening and closing of the folding door are made more scientific and reasonable. This optimizes the overall stress state of the mechanism, reduces local stress concentration, and improves structural strength and durability. At the same time, this linkage length ratio helps ensure the stability of the linkage's motion trajectory, allowing the folding door to fold and unfold smoothly and steadily under different widths, avoiding jamming and abnormal noises, and further improving the user experience and product reliability.

[0014] Furthermore, the second main connecting rod is provided with a second pivot point that is pivotally connected to the second end of the second auxiliary connecting rod. The distance L7 from the second pivot point to the first end of the second auxiliary connecting rod and the distance L8 from the second pivot point to the second end of the second auxiliary connecting rod satisfy the following relationship: L8≥L7.

[0015] By adopting the above scheme, this proportional relationship can make the force distribution of the second linkage more reasonable during the opening and closing of the folding door, reduce structural deformation or damage caused by excessive local force, and enhance the overall structural strength and stability. At the same time, it helps to ensure that the movement of each linkage is synchronized and smooth, avoids movement jamming, incoordination and other situations, and enables the folding door to operate smoothly under different working conditions, thereby improving the reliability and service life of the product.

[0016] Furthermore, the second main connecting rod bends along the second pivot point, with the bending direction towards the first auxiliary connecting rod, and the bending angle is an obtuse angle.

[0017] By adopting the above solution, the bending structure provides more room for movement of each link when the folding door is opened and closed, avoiding collisions and interference between links due to limited space, and ensuring smooth movement. At the same time, the obtuse angle bend helps to reasonably distribute the stress on the mechanism, enhance the overall structural strength and stability, make the folding door more durable and reliable during frequent opening and closing, and also make the folded door structure more compact, effectively saving indoor and outdoor space.

[0018] Furthermore, the length of the first main connecting rod is greater than the length of the second main connecting rod, and a receiving groove is provided on one side of the first main connecting rod. When the first end of the first main connecting rod and the second end of the second main connecting rod approach each other, the second end of the second main connecting rod can be partially accommodated in the receiving groove.

[0019] By adopting the above scheme, during movement, the reasonable length difference and the receiving groove cooperate to provide more flexible movement space for each link, avoid interference, and ensure smooth opening and closing of the folding door; after folding, the second main link is partially embedded in the receiving groove, which greatly reduces the overall space occupied, making the folding door structure more compact and improving the space utilization rate, especially suitable for places with strict space requirements.

[0020] Furthermore, the first main connecting rod is provided with a first step near its first end, so that a first gap space is formed between the first main connecting rod and the door and window connector; the first auxiliary connecting rod is provided with a second step near its first end, so that a second gap space is formed between the first auxiliary connecting rod and the door and window connector.

[0021] By adopting the above solution, these intervals provide buffering and room for movement between the connecting rod and the door / window connector during the folding door's operation, effectively avoiding friction and wear caused by close contact and extending the service life of the mechanism. At the same time, it can also prevent the connecting rod and the door / window connector from jamming during the operation, ensuring smooth opening and closing of the folding door and improving the user experience. In addition, the reasonable interval design also helps to optimize the overall force distribution of the mechanism and enhance the stability of the structure.

[0022] A folding door includes a door and window frame, a first door and window sash, a second door and window sash, and a folding door and window connecting mechanism. The first door and window sash is hinged to the second door and window sash. The door and window connector is fixed to the end of the first door and window sash away from the second door and window sash. The door and window frame is provided with a door and window frame sliding groove. The second end of the second main connecting rod is pivotally slidable in the door and window frame sliding groove through a pulley assembly.

[0023] By adopting the above solution, the first and second door / window sashes are hinged together, and with the specially designed folding door / window connecting mechanism, flexible folding and unfolding functions can be achieved. The door / window connector is fixed to a specific end of the first door / window sash, providing a stable force point for the connecting mechanism. The door / window frame is equipped with a sliding groove, and the second end of the second main connecting rod can pivotally slide in it via a pulley assembly. This not only ensures smooth relative movement between the connecting mechanism and the door / window frame, making the opening and closing process of the folding door smooth and stable, reducing jamming and abnormal noise, but also enhances the degree of freedom of movement through the pivoting characteristics of the pulley assembly, improving adaptability to different usage scenarios and door sash states, and comprehensively optimizing the user experience and performance of the folding door.

[0024] Furthermore, a pivot assembly is provided between the second door / window sash and the door / window frame. The pivot assembly includes a first fixing member fixed in the sliding groove of the door / window frame and a second fixing member fixed on the second door / window sash. The first fixing member and the second fixing member are pivotally connected.

[0025] By adopting the above solution, the pivot assembly provides an independent pivot point for the second door / window sash, allowing it to rotate flexibly relative to the door / window frame. Working in conjunction with the folding door / window connection mechanism, the second door / window sash can move with the overall folding structure during the opening and closing process, while also finely adjusting its posture according to its own rotational characteristics. This ensures smoother and more stable movement, effectively reducing jamming and wear. At the same time, it enhances the overall flexibility and adaptability of the folding door, enabling it to better cope with different installation environments and usage needs, thereby improving product reliability and user experience.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Adaptive and Interference-Avoiding: The core of this invention lies in the sliding joint connecting the first main link to the door / window connector. During the opening and closing of the folding door, when the connecting mechanism drives door panels of different widths, this sliding joint allows the first end of the first main link to slide relative to the door / window connector. This sliding degree of freedom automatically compensates for the inherent geometric differences in the four-bar linkage caused by variations in door panel width, fundamentally avoiding motion interference between links due to size mismatch. Therefore, the same connecting mechanism can be directly applied to door panels of various widths without any adjustment, achieving universality. 2. Smooth movement and stable performance: By introducing a sliding pair, the mechanism maintains a smooth and predetermined movement trajectory regardless of the fit width. The pivotable sliding end of the second main connecting rod within the door / window frame slide rail / groove further ensures the freedom and stability of the overall movement of the mechanism. The door opens and closes smoothly and without jamming or abnormal noise, providing a good user experience. 3. Convenient modification and reduced costs: When modifying existing doors to be foldable, there is no need to customize the connecting mechanism according to the door size. Simply install the connecting mechanism of this invention in the standard way, and it can be used directly. This greatly simplifies the modification process, reduces modification costs and construction time, and improves construction efficiency; 4. Optimized structure, compact and reliable: By setting specific rod length ratios, bending structures, receiving slots and stepped sections, the stress state, movement space and compactness after folding of the mechanism are further optimized, improving the structural strength, durability and space utilization of the product. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a schematic diagram of the folding structure of the folding door and window connecting mechanism according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the folding structure of the folding door and window connecting mechanism according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the opening structure of the folding door and window connecting mechanism according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the folding door in the closed state according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the opening structure of a folding door according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the folding door and window connection mechanism in the closed state according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the folding door and window connection mechanism during the opening process according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the folding door and window connection mechanism during the opening process according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the folding door and window connection mechanism in the open state according to an embodiment of the present invention; Figure 10 This is an exploded view of the connection structure of the folding door and window connection mechanism according to an embodiment of the present invention.

[0029] Explanation of key figure labels: 100. Folding door and window connecting mechanism; 10. Door and window connector; 11. Slide track; 20. First main connecting rod; 21. Sliding part; 22. First pivot point; 23. Receiving groove; 24. First step part; 30. Second main connecting rod; 31. Second pivot point; 32. Bending part; 40. First auxiliary connecting rod; 42. Second step part; 50. Second auxiliary connecting rod; 200. Door and window frame; 201. Door and window frame slide track; 202. Pulley assembly; 203. Rotating shaft assembly; 204. First fixing member; 205. Second fixing member; 300. First door and window sash; 400. Second door and window sash. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to 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.

[0033] 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.

[0034] 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.

[0035] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0036] Please see Figures 1 to 3 This application provides a folding door and window connecting mechanism, the core of which is to solve the problem of motion interference caused by the inability to adapt to door leaves of different widths due to the fixed size of the mechanism mentioned in the background art. The folding door and window connecting mechanism 100 mainly consists of a door and window connector 10, a first main connecting rod 20, a second main connecting rod 30, a first auxiliary connecting rod 40, and a second auxiliary connecting rod 50. The door and window connector 10 serves as the mounting base and is fixed to the edge of the first door and window leaf 300 by bolts or welding. The first end of the first main connecting rod 20 (… Figure 2 The right end) is connected to the door / window connector 10 via a sliding joint. The first end of the second main connecting rod 30 ( Figure 2 (lower end) and the second end of the first main connecting rod 20 ( Figure 2 The left end) is pivotally connected via hinge pins, etc. The second end of the second main connecting rod 30 ( Figure 2 The upper end is designed to connect to a pulley assembly for pivotally sliding within a track or groove (not shown) of the door / window frame 200. The first end of the first auxiliary link 40 is pivotally connected to the end of the door / window connector 10 furthest from the sliding pair. The first end of the second auxiliary link 50 is pivotally connected to the second end of the first auxiliary link 40, and the second end of the second auxiliary link 50 is pivotally connected to the second main link 30 near its middle. Furthermore, the first main link 20 and the first auxiliary link 40 are connected at another pivot point somewhere on the link body. These connections constitute a four-bar linkage. Its innovation lies in the sliding pair between the first main link 20 and the door / window connector 10. When this mechanism is applied to folding doors (such as...), Figure 6-9 During the opening process, the pulley at the end of the second main link 30 slides along the door and window frame track, pulling the entire four-bar linkage to move, causing the angle between the first main link 20 and the second main link 30 to gradually increase, thereby driving the door leaf to open. During this process, if the door leaf width differs from the original design reference of the mechanism, interference will occur in a traditional mechanism with fixed link lengths. However, in this mechanism, due to the presence of a sliding pair, the first end of the first main link 20 can automatically slide relative to the fixed door and window connector 10 (e.g., ...). Figures 1 to 3(It slides left and right). This sliding compensates for the geometric mismatch caused by the difference in door width, dynamically adjusts the relative positions of the rods inside the mechanism, thus naturally avoiding motion interference and ensuring the smooth completion of the folding action of door panels of different widths. During installation, it is only necessary to fix the door and window connector 10 to the designated side of the first door panel 300, without the need to pre-adjust the position of the sliding pair for different door widths.

[0037] Specifically, in one particular embodiment, such as Figure 3 As shown, a strip-shaped groove 11 extending along its length is machined on the plate of the door and window connector 10. A sliding part 21 is provided at the first end of the first main connecting rod 20. This sliding part 21 can be a pulley embedded in the groove 11 and capable of rolling within it, or it can be a light shaft (pivot) passing through the groove 11, with both ends limited but capable of sliding within the groove. The cooperation between the pulley or light shaft and the groove 11 constitutes a low-friction, highly guiding sliding pair. Using this sliding pair provides precise linear trajectory constraints for the sliding of the first main connecting rod 20, ensuring smooth, linear motion without wobbling. The pulley solution has a low coefficient of friction and is easier to operate; the pivot solution has a simple and robust structure.

[0038] In some embodiments, the dimensional relationship between the slide 11 and the door / window connector 10 can be optimized to provide sufficient travel for sliding, ensure that there is still room for extreme movement positions, and prevent impact interference.

[0039] Specifically, the total length of the door and window connector 10 is defined as L1, and the effective sliding length between the two ends of the slide groove 11 is defined as L2. This embodiment requires that both satisfy: L1 ≥ 2 × L2. This proportional relationship means that the slide groove 11 only occupies a portion of the length of the door and window connector 10, leaving sufficient material allowance at both ends. This provides ample space for the sliding part 21 of the first main connecting rod 20 to move throughout its entire range within the slide groove 11. Regardless of the door width, the sliding part 21 is unlikely to reach the theoretical endpoint of the slide groove 11 during movement and will not experience a hard impact with the end, effectively preventing end interference and improving the reliability and safety of the mechanism's movement. Simultaneously, the ample allowance also reduces the precision requirements for parts processing and installation.

[0040] In some embodiments, the connection point between the first main link 20 and the first auxiliary link 40 can be optimized to improve the force transmission efficiency and motion smoothness of the mechanism. For example... Figure 2As shown, a first pivot point 22 is set at the intersection of the first main link 20 and the first auxiliary link 40. Let L3 be the distance from the first pivot point 22 to the first end (sliding end) of the first main link 20, and L4 be the distance to its second end (the end connecting to the second main link 30), with L3 > L4. This design brings the first pivot point 22 closer to the output end of the first main link 20 that drives the door leaf. When the first auxiliary link 40 transmits motion, the action on the shorter lever arm (L4) of the second half of the first main link 20 generates a more effective lever effect, making the response of the first main link 20 faster and the drive more powerful. Simultaneously, the longer L3 provides a more stable support base for the sliding end. The combination of these two factors optimizes the motion transmission chain, making the door leaf opening and closing action smoother and more powerful.

[0041] In some embodiments, the connection point between the second auxiliary link 50 and the second main link 30 can be defined to optimize the stress state of the second auxiliary link 50. For example... Figure 2 As shown, a second pivot point 31 is provided on the second main connecting rod 30, connecting to the end of the second auxiliary connecting rod 50. The distance from the second pivot point 31 to the first end of the second auxiliary connecting rod 50 (i.e., the end connected to the first auxiliary connecting rod 40) is defined as L7, and the distance to its second end (i.e., the connection point itself) is defined as L8, requiring L8 ≥ L7. This positions the second pivot point 31 closer to the center or slightly off-center from the drive side of the second auxiliary connecting rod 50. This helps the second auxiliary connecting rod 50 primarily bear tensile and compressive axial forces during movement, reducing the bending moment it bears, thereby reducing the risk of deformation, improving the stiffness and force transmission efficiency of the connecting rod, and ultimately enhancing the structural stability of the entire mechanism.

[0042] In some embodiments, the shape of the second main link 30 can also be modified to resolve motion space conflicts and optimize force flow transmission. Specifically, such as Figure 1-3 As shown, the second main connecting rod 30 forms an outward-facing obtuse-angled bend 32 at the second pivot point 31, i.e., towards the first auxiliary connecting rod 40. Firstly, the bend 32 provides clearance for the second auxiliary connecting rod 50 and other adjacent connecting rods during folding, effectively preventing interference between the rods in the plane of motion. Secondly, the obtuse-angle bend facilitates the smooth transmission of internal forces (tension and compression), reduces stress concentration at corners, and improves the structural strength and fatigue life of the second main connecting rod 30.

[0043] In some embodiments, the cooperation between the first main link and the second main link can be further optimized to achieve the ultimate compactness in the folded state. For example... Figure 1-3 As shown, the overall length of the first main connecting rod 20 is greater than that of the second main connecting rod 30. A recessed receiving groove 23 is machined or formed on the side of the first main connecting rod 20, i.e., the side facing the second main connecting rod 30. When the door is closed (e.g....), Figure 1 The first main connecting rod 20 and the second main connecting rod 30 are roughly parallel and close together. (See also...) Figure 10 The second main connecting rod 30 is pivotally connected to the pulley assembly 202 via a shaft. When the door is closed, the presence of the receiving groove 23 provides sufficient clearance for the shaft, resulting in better overlap between the second main connecting rod 30 and the first main connecting rod 20. This nested design significantly reduces the space occupied by the two main connecting rods in the folded state, making the entire connecting mechanism 100 and the door thinner when folded, thus saving storage space.

[0044] In some embodiments, the contact area is structurally optimized to avoid unnecessary friction and interference between the moving part and the stationary part. Specifically, such as... Figure 2 and Figure 3 As shown, a first step 24 is provided near the sliding portion at the first end of the first main connecting rod 20. This step creates a certain gap, i.e., a first interval space, between the body of the first main connecting rod 20 and the surface of the door / window connector 10. Similarly, a second step 42 is provided near the end of the first auxiliary connecting rod 40 that is pivotally connected to the door / window connector 10, forming a second interval space. These gaps provide allowance for minor elastic deformation, thermal expansion and contraction, or assembly tolerances of the connecting rods during movement. They effectively prevent the first main connecting rod 20 and the first auxiliary connecting rod 40 from scratching or making hard contact with the surface of the door / window connector 10 during movement, thereby avoiding unnecessary frictional resistance, wear, and noise, and ensuring the purity and smoothness of the mechanism's operation.

[0045] This invention also relates to a folding door, comprising the aforementioned folding door and window connecting mechanism 100, integrated into a complete folding door product. It solves the problem of how to integrate an adjustable connecting mechanism with the door leaf and door frame into a stable and reliable product. Specifically, as... Figure 4-10 As shown, a folding door includes a door / window frame 200, a first door / window sash 300, a second door / window sash 400, and a folding door / window connecting mechanism 100. The first door / window sash 300 and the second door / window sash 400 are hinged to adjacent sides by hinges. A door / window connector 10 is fixed to the side of the first door / window sash 300 away from the hinge side. A door / window frame slide rail or a door / window frame slide groove 201 is installed on the upper or lower part of the door / window frame 200. A pulley assembly 202 is connected to the second end of the second main connecting rod 30. The pulley of the pulley assembly 202 is embedded in the door / window frame slide rail or door / window frame slide groove 201 and can roll along it. At the same time, the pulley assembly 202 is rotatably connected to the end of the second main connecting rod 30, so that it can be pivotally slidable.

[0046] The working principle and effect of this folding door: When the door is opened, as... Figure 4As shown, pushing the first door / window sash 300 initiates the movement of the folding door / window connecting mechanism 100. The pulley assembly 202 at the end of the second main link 30 slides from one end to the other within the door / window frame slide rail or door / window frame slide groove 201, while simultaneously, the first end of the first main link 20 adaptively slides within the slide groove 11 of the door / window connector 10. During this process, the four-bar linkage causes the first door / window sash 300 to translate and rotate relative to the door / window frame 200, and drives the second door / window sash 400 to move synchronously via hinges, ultimately achieving parallel folding of the two doors (e.g., ...). Figure 5 (Illustrative state). Due to the adaptive nature of the connecting mechanism 100, this folding door product can directly adapt to combinations of first and second door / window sashes of different widths, without the need to customize different connecting mechanisms for door sashes of different sizes, making it extremely versatile.

[0047] In some embodiments, an auxiliary rotation fulcrum can be added to the folding door to further regulate and stabilize the movement trajectory of the second door / window sash 400. For example... Figure 6-10 As shown, the second door / window sash 400, on its opposite side from the hinged side with the first door / window sash 300, is connected to the door / window frame 200 via a pivot assembly 203. This pivot assembly 203 can be a simple pivot support, allowing the second door / window sash 400 to rotate around it. The pivot assembly 203 provides a defined and independent center of rotation for the second door / window sash 400. During folding, the movement of the second door / window sash 400 is driven by the connecting mechanism 100 and constrained by this pivot assembly 203. This makes its movement trajectory more stable and controllable, reducing potential swaying or offset, especially in large or heavy-duty door / window applications, improving the overall smoothness and reliability of the movement.

[0048] In one specific embodiment, such as Figure 10 As shown, the pivot assembly 203 includes a first fixing member 204 fixed within the door / window frame slide groove 201, and a second fixing member 205 fixed to the second door / window sash 400. The first fixing member 204 and the second fixing member 205 are pivotally connected. Optionally, the connection between the second fixing member 205 and the second door / window sash 400 includes, but is not limited to, a threaded connection, a snap-fit ​​connection, or welding. The connection between the second door / window sash 400 and the second fixing member 205 includes, but is not limited to, a threaded connection, a snap-fit ​​connection, or welding.

[0049] 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. A folding door and window connecting mechanism, characterized in that, include: Door and window connector (10), the door and window connector (10) is used to fix it to the first door and window sash (300) of the folding door; The first main connecting rod (20) has its first end connected to the door and window connector (10) via a sliding pair; The second main link (30) has its first end pivotally connected to the second end of the first main link (20), and the second end of the second main link (30) is pivotally slidably mounted on the door and window frame (200). The first connecting rod (40) has its first end pivotally connected to the door and window connector (10); The second auxiliary link (50) has its first end pivotally connected to the second end of the first auxiliary link (40), and its second end pivotally connected to the second main link (30). The first main link (20) and the first auxiliary link (40) are pivotally connected at a certain point between them, such that the first main link (20), the second main link (30), the first auxiliary link (40) and the second auxiliary link (50) together constitute a four-bar linkage. The sliding joint is configured to allow the first end of the first main link (20) to slide along the door and window connector (10) during the opening and closing of the folding door.

2. The folding door and window connecting mechanism according to claim 1, characterized in that, The door and window connector (10) is provided with a sliding groove (11) along its length direction. The sliding pair is the cooperation between the pulley or pivot located at the first end of the first main connecting rod (20) and the sliding groove (11).

3. The folding door and window connecting mechanism according to claim 2, characterized in that, The total length of the door and window connector (10) is L1, and the effective length of the slide (11) is L2, and the following conditions are met: L1≥2×L2.

4. The folding door and window connecting mechanism according to claim 1, characterized in that, The first main connecting rod (20) and the first auxiliary connecting rod (40) are provided with a first pivot point (22) that passes through them. The distance L3 from the first pivot point (22) to the first end of the first main connecting rod (20) is greater than the distance L4 from the first pivot point (22) to the second end of the first main connecting rod (20). The distance L5 from the first pivot point (22) to the first end of the first auxiliary connecting rod (40) is less than or equal to the distance L6 from the first pivot point (22) to the second end of the first auxiliary connecting rod (40).

5. A folding door and window connecting mechanism according to claim 1, characterized in that, The second main link (30) is provided with a second pivot point (31) that is pivotally connected to the second end of the second auxiliary link (50). The distance L7 from the second pivot point (31) to the first end of the second auxiliary link (50) and the distance L8 from the second pivot point (31) to the second end of the second auxiliary link (50) satisfy the following relationship: L8≥L7.

6. A folding door and window connecting mechanism according to claim 5, characterized in that, The second main connecting rod (30) bends at the second pivot point (31), with the bending direction toward the first auxiliary connecting rod (40), and the bending angle is obtuse.

7. A folding door and window connecting mechanism according to claim 1, characterized in that, The length of the first main connecting rod (20) is greater than the length of the second main connecting rod (30). A receiving groove (23) is provided on one side of the first main connecting rod (20). When the first end of the first main connecting rod (20) and the second end of the second main connecting rod (30) approach each other, the second end of the second main connecting rod (30) can be partially accommodated in the receiving groove (23).

8. A folding door and window connecting mechanism according to claim 1, characterized in that, The first main connecting rod (20) is provided with a first step (24) near its first end, so that a first gap space is formed between the first main connecting rod (20) and the door and window connector (10); the first secondary connecting rod (40) is provided with a second step (42) near its first end, so that a second gap space is formed between the first secondary connecting rod (40) and the door and window connector (10).

9. A folding door, characterized in that, The device includes a door and window frame (200), a first door and window sash (300), a second door and window sash (400), and a folding door and window connecting mechanism (100) as described in any one of claims 1-8. The first door and window sash (300) is hinged to the second door and window sash (400). The door and window connector (10) is fixed to the end of the first door and window sash (300) away from the second door and window sash (400). The door and window frame (200) is provided with a door and window frame slide groove (201). The second end of the second main connecting rod (30) is pivotally slidable in the door and window frame slide groove (201) through a pulley assembly (202).

10. A folding door according to claim 9, characterized in that, A pivot assembly (203) is also provided between the second door / window sash (400) and the door / window frame (200). The pivot assembly (203) includes a first fixing member (204) fixed in the sliding groove (201) of the door / window frame and a second fixing member (205) fixed on the second door / window sash (400). The first fixing member (204) and the second fixing member (205) are pivotally connected.

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