Folding chair frame and folding chair

Abstract

A folding chair frame and a folding chair. The folding chair frame comprises a seat frame (500), chair leg assemblies (100), a footrest tube assembly (200) and a linkage driving assembly (300). The linkage driving assembly (300) comprises a driving rod assembly (310) and a linkage member (320) which are hinged to each other, and the linkage member (320) is hinged to the footrest tube assembly (200). The driving rod assembly (310) has an operating end (311). The driving rod assembly (310) is hinged to a corresponding chair leg assembly (100). When the operating end (311) is subjected to a first operating force, the linkage driving assembly (300) can drive the linkage member (320) to lift the footrest tube assembly (200) to a predetermined position and lock same; when the operating end (311) is subjected to a second operating force and the footrest tube assembly (200) is unlocked, the linkage driving assembly (300) can drive the linkage member (320) to drive the footrest tube assembly (200) to move in the direction away from the predetermined position, the direction of the second operating force being opposite to the direction of the first operating force. The footrest can be independently controlled, and thus, in cooperation with a backrest, can satisfy different requirements of users for footrest and backrest positions in different usage scenarios.

Description

A folding chair frame and a folding chair

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 202421205358.3, filed on May 29, 2024, entitled “A Folding Chair Frame and a Folding Chair Thereof,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of folding chair technology, specifically to a folding chair frame and a folding chair thereof. Background Technology

[0004] In related technologies, traditional folding chair designs typically consist of a backrest and a footrest. These chairs are designed to allow for a mechanical linkage between the backrest and footrest to simplify the folding mechanism. Specifically, when the backrest tilts backward from an upright position to a flat position, this linkage causes the footrest to automatically rise. Conversely, when the backrest is raised forward from a flat position to a non-flat, upright position, the footrest is linked to the backrest and lowers accordingly, rather than remaining in the raised position.

[0005] However, this linkage mechanism introduces certain limitations in practical applications. For example, when a user sits on a folding chair with the backrest upright, the lifting of the footrest is synchronized with the tilting of the backrest, preventing the user from using the raised footrest unless they adjust the backrest to a flat position. Similarly, when a user chooses to lie down on a folding chair with the backrest flat, their feet can only be placed on the footrests raised by the linkage mechanism, and they cannot bend their feet and place them on the bottom surface. This limits user comfort and the chair's usability to some extent.

[0006] Therefore, those skilled in the art need to develop a folding chair frame and folding chair in which the footrest can be detached from the backrest and controlled independently to meet the different needs of users for the footrest position in different usage scenarios.

[0007] Public content

[0008] This disclosure aims to address, to a certain extent, one of the technical problems in related technologies. To this end, embodiments of this disclosure provide a folding chair frame and a folding chair thereof, capable of independent control of the footrest, combined with a backrest, to meet the different needs of users for the positions of the footrest and backrest in various usage scenarios.

[0009] To achieve the above objectives, this disclosure provides a folding chair frame, including a seat frame, chair leg assemblies mounted on the left and right sides of the seat frame for support, and a footrest tube assembly hinged to the front side of the seat frame; the folding chair frame further includes at least one linkage drive assembly; at least one side of the chair leg assembly corresponds to the linkage drive assembly;

[0010] The linkage drive assembly includes a drive rod assembly and a connecting rod that are hinged together; one end of the connecting rod away from the drive rod assembly is hinged to the footrest tube assembly; the drive rod assembly has an operating end; the drive rod assembly and the corresponding chair leg assembly are hinged such that the operating end and the other end of the connecting rod can rotate about the hinge.

[0011] When the operating end is subjected to a first operating force away from the footrest tube assembly, the linkage drive assembly can drive the linkage to lift the footrest tube assembly to a predetermined position and lock it.

[0012] When the operating end is subjected to a second operating force and the footrest tube assembly is unlocked, the linkage drive assembly can drive the linkage to move the footrest tube assembly away from the predetermined position; wherein, the direction of the second operating force is opposite to the direction of the first operating force.

[0013] Optionally, the drive rod assembly includes a drive rod; one end of the drive rod is hinged to the connecting rod, and the other end of the drive rod forms the operating end away from the connecting rod; the middle part of the drive rod assembly is hinged to the corresponding chair leg assembly; when the footrest tube assembly reaches the predetermined position, the portion connected between the drive rod and the connecting rod extends continuously in the length direction.

[0014] Optionally, the drive rod assembly further includes a hinge; the drive rod and the connecting rod are hinged together by the hinge; the hinge includes two hinged connecting parts, each connecting part is provided with a receiving groove, and the two receiving grooves are respectively connected to the ends of the corresponding drive rod and the connecting rod; in the locked state of the foot support tube assembly, the main body end formed by the drive rod and the corresponding connecting part is connected to the main body end formed by the connecting rod and the corresponding connecting part.

[0015] Optionally, one end of the connecting part is provided with two opposing side ears, and the receiving groove is located between the two side ears; the two side ears on one connecting part are disposed between the two side ears on the other connecting part, and the side ears of the two connecting parts are hinged together by a through pin.

[0016] Optionally, the connecting portion is bent to form a U-shaped receiving groove; the side ear is integrally formed with the connecting portion and extends outward from the receiving groove.

[0017] Optionally, the hinge further includes a sheath, wherein one of the connecting portions is at least partially embedded inside the sheath; the sheath is fixed to the end of one of the drive rod assembly and the connecting rod.

[0018] Optionally, the sheath is fixed to the end of the corresponding drive rod assembly or the connecting rod by through screws and / or rivets.

[0019] Optionally, when the footrest assembly is in a predetermined position, an angle of 170° to 180° is formed between the extension direction of the drive rod assembly and the extension direction of the connecting rod, with the hinge as the center.

[0020] Optionally, at least one of the two ends of the drive rod assembly and the connecting rod that are in contact with each other has an angle between its extension direction and its end face that is between 80° and 90°.

[0021] Optionally, the drive rod is L-shaped, with its corner hinged to the chair leg assembly, one end of the drive rod hinged to the connecting rod, and the other end of the drive rod serving as the operating end.

[0022] Optionally, the folding chair frame further includes a backrest support assembly; both the backrest support assembly and the seat frame include a left support portion and a right support portion arranged opposite each other in the left-right direction, the left support portion of the backrest support assembly is hinged to the left support portion of the seat frame, and the right support portion of the backrest support assembly is hinged to the right support portion of the seat frame; a folding member is provided between the left support portion and the right support portion of one of the backrest support assembly and the seat frame, the folding member being able to bring the left support portion and the right support portion of the seat frame closer together when folded, and the folding member being able to be stored between the left support portion and the right support portion.

[0023] Optionally, the footrest assembly includes a left footrest and a right footrest, and a foldable connecting rod with its two ends connected to the left footrest and the right footrest respectively. When folded, the foldable connecting rod allows the left footrest and the right footrest to come together and be stored between the left footrest and the right footrest.

[0024] Optionally, the foldable connecting rod includes two hinged first folding tubes and a second folding tube, wherein the end of the first folding tube away from the second folding tube is hinged to the free end of the left footrest tube, and the end of the second folding tube away from the first folding tube is hinged to the free end of the right footrest tube.

[0025] Optionally, when the operating end is subjected to a second operating force, the linkage drive assembly can unlock the footrest assembly by retracting the drive rod assembly and the linkage.

[0026] Optionally, the chair leg assembly is provided with a retractable elastic limiting member or a magnetic limiting member. When the linkage drive assembly drives the linkage to lift the footrest tube assembly to a predetermined position, the elastic limiting member or magnetic limiting member extends from the chair leg assembly and abuts against the drive linkage to limit the rotation of the drive linkage.

[0027] Optionally, the chair leg assembly is provided with a retractable elastic limiting member, which is a spring plunger, and the exposed end of the spring plunger is a hemispherical surface.

[0028] Optionally, the footrest assembly includes a first segment and a second segment connected together; the first segment of the footrest assembly is hinged to the front end of the seat frame; when the footrest assembly is raised to a predetermined position, the first segment of the footrest assembly is located in the extending direction of the front end of the seat frame; the second segment of the footrest assembly bends toward the chair leg assembly.

[0029] Optionally, the other end of the drive rod assembly is bent away from the chair leg assembly to form the operating end; the operating end is rotated about the hinge in the middle of the drive rod assembly to a position close to the chair leg assembly, so that a gap for a hand to pass through can be formed between the operating end and the chair leg assembly.

[0030] Furthermore, this disclosure also provides a folding chair, which includes a folding chair frame as described in any of the foregoing embodiments and a fabric disposed on the folding chair frame to provide support, the fabric being arranged on the seat frame. The reasoning process for the beneficial effects of the folding chair provided in this disclosure embodiment is similar to that of the aforementioned folding chair frame, and will not be repeated here.

[0031] Compared with existing technologies, the beneficial effects of the embodiments of this disclosure include, for example:

[0032] The folding chair frame includes a seat frame, leg assemblies, footrest tube assemblies, and a linkage drive assembly. The linkage drive assembly includes a hinged drive rod assembly and a connecting rod. One end of the connecting rod is hinged to the footrest tube assembly. The drive rod assembly has an operating end. The drive rod assembly and the corresponding leg assembly are hinged. When the operating end is subjected to a first operating force, the linkage drive assembly can drive the connecting rod to lift the footrest tube assembly to a predetermined position and lock it. When the operating end is subjected to a second operating force and the footrest tube assembly is unlocked, the linkage drive assembly can drive the connecting rod to move the footrest tube assembly away from the predetermined position. The direction of the second operating force is opposite to the direction of the first operating force. This folding chair frame allows for independent control of the footrest, working in conjunction with the backrest to meet the different needs of users for the position of the footrest and backrest in different usage scenarios.

[0033] These features and advantages of this disclosure will be disclosed in detail in the following specific embodiments and accompanying drawings. The best embodiments or means of this disclosure will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this disclosure. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar construction or function. Attached Figure Description

[0034] The present disclosure will be further explained below with reference to the accompanying drawings:

[0035] Figure 1 is a schematic diagram of the folding chair provided in the embodiment of this disclosure in the left-right direction, wherein the footrest tube assembly is not raised.

[0036] Figure 2 is a structural schematic diagram of the folding chair provided in an embodiment of this disclosure, wherein the footrest tube assembly is not raised.

[0037] Figure 3 is a schematic diagram of the structure of the folding chair provided in the embodiment of this disclosure in the left-right direction, wherein the footrest tube assembly is raised to a predetermined position.

[0038] Figure 4 is a partial enlarged view of the folding chair provided in the embodiments of this disclosure at the drive rod assembly, connecting rod, and hinge.

[0039] Figure 5 is a bottom view of the folding chair described in this embodiment, showing the gap between the operating end and the footrest tube assembly.

[0040] Figure 6 is a structural schematic diagram of the folding chair provided in an embodiment of this disclosure.

[0041] Figure 7 is a cross-sectional view along the E-E direction in Figure 6, showing the cross-section of the drive rod and connecting rod.

[0042] Among them, 100 is the chair leg assembly; 200 is the footrest tube assembly; 201 is the first section; 202 is the second section; 210 is the left footrest tube; 220 is the right footrest tube; 230 is the foldable connecting rod; 300 is the linkage drive assembly; 310 is the drive rod assembly; 311 is the operating end; 312 is the gap; 320 is the connecting rod; 330 is the hinge; 331 is the connecting part; 332 is the side lug; 340 is the protective cover; 400 is the backrest support assembly; 410 is the folding component; and 500 is the seat frame. Detailed Implementation

[0043] The embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this disclosure and should not be construed as limiting it.

[0044] In the description of this disclosure, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0045] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0046] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0047] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this disclosure. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0048] In a first aspect, the present disclosure provides a folding chair frame, as shown in Figures 1, 2 and 3. The folding chair frame includes the following parts: a backrest support assembly 400 that provides back support, a seat frame 500 that forms the main body of the seat, and chair leg assemblies 100 that are installed on the left and right sides of the seat frame 500 to provide support. In addition, in order to enhance the comfort and convenience during use, a footrest tube assembly 200 is specially provided that is hinged to the front side of the seat frame 500.

[0049] Specifically, the backrest support assembly 400 is a key component of the entire folding chair frame. It not only provides necessary back support for the user, but its structural design also directly affects the stability and durability of the folding chair frame. The seat frame 500 is the main load-bearing component when the user is sitting or lying down. It is horizontally positioned when the folding chair is fully extended to ensure the user's comfort.

[0050] With the folding chair fully extended and in a reclining position, the seat frame 500 has a horizontal layout. Optionally, considering ergonomic principles, the front of the seat frame 500 is slightly higher than the rear to more naturally adapt to a sitting posture and reduce pressure on the legs and back.

[0051] Regarding folding methods, this folding chair frame offers flexible options. Depending on the user's specific needs and usage scenarios, the seat frame 500 can be folded conveniently in a left-right folding manner and / or efficiently in a front-back flipping manner, facilitating storage and deployment in different directions. This design does not impose any restrictions on specific folding methods, aiming to provide maximum flexibility in use.

[0052] The lower ends of the backrest support assembly 400 are hinged to the rear ends of the seat frame 500. An armrest assembly is provided between the backrest support assembly 400 and the leg assembly 100. The middle sections of the left and right sides of the backrest assembly are linked to the leg assembly 100 via the armrest assembly. For example, the middle sections of the left and right sides of the backrest assembly are hinged to the rear ends of the corresponding armrest assemblies. The armrest assembly can be horizontally positioned, or its front end can be slightly higher than its rear end, or it can even be parallel to the seat frame 500. The middle section of the armrest assembly is hinged to the top of the leg assembly 100.

[0053] Optionally, the armrest assembly has multiple hinge slots at its lower part, and the chair leg assembly 100 has a hinge shaft at its top that can be adapted to the hinge slots. By selecting one of the hinge slots and the hinge shaft to combine, the connection between the armrest assembly and the chair leg assembly 100 can be disassembled, thereby adjusting the angle of the backrest assembly.

[0054] Furthermore, when the chair leg assembly 100 is folded, the backrest support and the chair leg assembly 100 can be linked through the armrest assembly, causing the upper end of the backrest support assembly 400 to tilt forward and approach the front of the seat frame 500.

[0055] The folding chair frame also includes at least one linkage drive assembly 300, with at least one linkage drive assembly 300 corresponding to one side of the chair leg assembly 100. This means that a linkage drive assembly 300 can be installed on either side of the chair leg assembly 100 of the seat frame 500, or one linkage drive assembly 300 can be installed on each side of the chair leg assembly 100, so that the user can choose to use one of them.

[0056] Optionally, the chair leg assemblies 100 on both sides of the seat frame 500 consist of a front chair leg and a rear chair leg hinged at their upper ends. Taking one side of the chair leg assembly 100 as an example, the front chair leg of this side has two mounting holes running from top to bottom along the left-right direction of the folding chair, namely the first mounting hole and the second mounting hole. The middle part of the seat frame 500 is pivotally hinged to the first mounting hole via a rivet, bolt, or nut. The rear chair leg of this side also has a third mounting hole and a fourth mounting hole running along the left-right direction of the folding chair at its middle part. The lower ends of both sides of the backrest assembly, the rear side of the seat frame 500, and the third mounting hole are hinged together by an L-shaped hinge. The L-shaped hinge has three shaft holes arranged in a triangle. Two of these holes are fixed to their corresponding mounting holes using anchors, while the third hole is hinged via a pivot to one of the lower ends of the backrest assembly on both sides or the rear side of the seat frame 500, for example, using a rivet, bolt, or nut. The hinge points between the lower ends of the backrest assembly on both sides and the rear side of the seat frame 500 are also near the pivot of the L-shaped hinge.

[0057] Optionally, the linkage drive assembly 300 includes a drive rod assembly 310 and a connecting rod 320 hinged together. One end of the connecting rod 320, away from the drive rod assembly 310, is hinged to the footrest tube assembly, and the opposite end of the connecting rod 320 is hinged to the drive rod assembly 310. The drive rod assembly has an operating end that is away from the other end of the connecting rod. The middle portion of the drive rod assembly is hinged to a corresponding chair leg assembly, allowing the operating end and the other end of the connecting rod to rotate about the hinge point.

[0058] Optionally, the drive rod assembly 310 includes a drive rod and a hinge at one end of the drive rod. One end of the drive rod is hinged to one end of a connecting rod via the hinge, and the other end of the drive rod is away from the connecting rod, forming the operating end. The middle part of the drive rod and the second mounting hole on the front chair leg in the chair leg assembly 100 are connected by a pivot, such as a rivet, bolt, or nut.

[0059] In this embodiment, the hinge position between the connecting rod 320 and the footrest tube assembly 200 is located in the middle of the footrest tube assembly 200, a distance away from the hinge point between the footrest tube assembly 200 and the front side of the seat frame 500. This allows the other end of the connecting rod 320 to drive the footrest tube assembly 200 to rotate around the front side of the seat frame 500. Of course, the hinge position between the connecting rod 320 and the footrest tube assembly 200 can also be located at other positions on the footrest tube assembly 200, such as at the end of the footrest tube assembly 200 away from the seat frame 500. As long as the connecting rod 320 can drive the footrest tube assembly 200 to rotate around the front side of the seat frame 500, the hinge position is not limited here.

[0060] For ease of explanation, as shown in Figure 1, in this embodiment, point A is the hinge axis between the middle of the drive rod assembly 310 and the front chair leg of the chair leg assembly 100; point B is the hinge axis between the other end of the connecting rod 320 and the middle of the footrest tube assembly 200; point C is the hinge axis between the drive rod assembly 310 and the connecting rod 320 (located on the side lug 332 of the hinge member 330); and point D is the hinge axis between the front side of the seat frame assembly and the footrest tube assembly 200.

[0061] When a first operating force is applied to the operating end 311 away from the footrest tube assembly 200, the footrest tube assembly 200 can be lifted and reach a predetermined position. At this predetermined position, the angle between the footrest tube assembly 200 and the seat frame 500 is opened to its maximum, or in other words, the footrest tube assembly 200 is raised to a set highest position. Simultaneously, the footrest tube assembly 200 is locked, causing the drive rod assembly 310 and the connecting rod 320 to extend continuously in the length direction. That is, after the footrest tube assembly 200 is opened to its maximum angle, the force exerted by the footrest tube assembly 200 on the connecting rod drive assembly 300 is mainly transmitted along its length direction and acts at the hinge point between the drive rod assembly 310 and the front seat leg. The connecting rod 320 experiences almost no torque in its corresponding vertical plane.

[0062] When a second operating force is applied to the operating end 311, the footrest tube assembly 200 is unlocked, and the footrest tube assembly 200 moves away from a predetermined position. That is, the angle between the footrest tube assembly 200 and the seat frame 500 is minimized, or the free end of the footrest tube assembly 200 is placed at its lowest position, for example, the free end hangs vertically and falls to the ground. Simultaneously, the drive rod assembly 310 and the connecting rod 320 are folded between the footrest tube assembly 200 and the seat frame 500. Here, with reference to the operating end, the direction of the second operating force is opposite to the direction of the first operating force.

[0063] Optionally, as shown in Figure 4, the hinge 330 includes two hinged connecting portions 331, each having a receiving groove configured to connect with the end of one of the drive rod assembly 310 and the connecting rod 320. The ends of the drive rod assembly 310 and the connecting rod 320 are inserted into their respective receiving grooves and connected by through screws. In the locked state of the footrest assembly, the end of the main body formed by the drive rod assembly and the corresponding connecting portion abuts and fits against the end of the main body formed by the connecting rod and the corresponding connecting portion, allowing the force on the connecting rod 320 to pass through the mating surface. Simultaneously, by designing a suitable angle on the mating surface, self-locking is achieved between the drive rod assembly 310 and the connecting rod 320, thereby locking the footrest assembly.

[0064] Optionally, the hinge includes two side ears 332 disposed opposite to each end of each connecting portion 331, with the receiving groove located between the two side ears 332. The two side ears 332 on one connecting portion 331 are disposed between the two side ears 332 on the other connecting portion 331, and the side ears 332 of the two connecting portions 331 are hinged together by a through pin. In this embodiment, the connecting portion 331 is formed by bending a sheet metal part, i.e., by bending to form a U-shaped receiving groove. The side ears 332 are integrally formed with the connecting portion 331 and extend outward beyond the receiving groove by a certain distance, so as to avoid motion interference when installing the end of the drive rod assembly 310 or the connecting rod 320, and when the two rotate relative to each other.

[0065] Optionally, the hinge 330 further includes a sleeve 340, with one of the connecting portions 331 at least partially embedded inside the sleeve 340. Specifically, the sleeve 340 is also formed by bending a sheet metal part. The size of the U-shaped groove formed when the sleeve 340 is bent is precisely adapted to the surface of the connecting portion 331. By providing a sleeve 340 on the surface of the connecting portion 331, the connection is strengthened and stabilized. Of course, the sleeve 340 can also be designed as a hollow cylinder and fitted onto the connecting portion 331. In addition, the sleeve can be designed with other shapes and structures, which are not limited here. As needed, one or more sleeves 340 can be provided outside the two connecting portions 331. The sleeve 340 can be provided outside one of the connecting portions 331 or simultaneously outside both connecting portions 331. Similarly, the sleeve 340 is fixed to the end of the corresponding drive rod assembly and connecting rod by through screws and / or rivets. Of course, the sheath 340 can also be fixed to the end of the corresponding drive rod assembly and connecting rod by welding or using other detachable connection methods such as snap-fit, which is not limited here.

[0066] Optionally, as shown in Figure 3, when the footrest assembly 200 is raised to a predetermined position, the drive rod assembly 310 and the connecting rod 320 extend to both sides of the main body, forming an angle of 170° to 180° with the hinge 330 as the center. The figure uses 176° as an example. The angle between the extension directions of the drive rod assembly 310 and the connecting rod 320 can be 170°, 171°, 172°, 173°, 174°, 175°, 176°, 177°, 178°, 179°, or 180°. Of course, the angle between them can also be designed to other angles, depending on the application, and is not limited here. Even if the extension direction of the drive rod assembly 310 and the extension direction of the connecting rod 320 form an angle of 170° to 180° in the vertical plane corresponding to the linkage drive assembly 300, the connecting rod 320 can still have almost no torque or very little torque in its corresponding vertical plane. However, the torque can also be reduced by increasing the width of the connecting rod 320, as shown by d in the figure.

[0067] Optionally, at least one of the two ends of the drive rod assembly 310 and the connecting rod 320 that are connected together has an angle between its extension direction and its end face that is between 80° and 90°. For example, to make the extension direction of the drive rod assembly 310 and the extension direction of the connecting rod 320 form an angle of 176°, the angle between the end face of the drive rod assembly 310 and its extension direction can be 90°, and the angle between the end face of the connecting rod 320 and its extension direction can be 86°; similarly, they can be interchanged. Alternatively, the angle between the end face of the drive rod assembly 310 and its extension direction can be 88°, and the angle between the end face of the connecting rod 320 and its extension direction can also be 88°. Of course, the angle between the end face of the connecting rod 320 and its extension direction can also be designed to other angles, depending on the application, and is not limited here. In some alternative embodiments, the two ends may also be the ends of the main body composed of the drive rod assembly and the corresponding connecting part, and the ends of the main body composed of the connecting rod and the corresponding connecting part, which will not be described in detail here.

[0068] For locking the footrest assembly, besides creating a mechanical dead zone or dead point by forming a specific angle between the drive rod assembly 310 and the connecting rod 320 during docking, thereby achieving self-locking and fixing of the footrest assembly, other additional components can be used to achieve locking. For example, a retractable elastic limiter or magnetic limiter can be installed on the chair leg assembly 100. When the connecting rod drive assembly 300 drives the connecting rod 320 to lift the footrest assembly 200 to a predetermined position, the elastic limiter or magnetic limiter extends from the chair leg assembly 100 and abuts or contacts the drive connecting rod 320 to restrict the rotation of the drive connecting rod 320, thus effectively fixing and locking the footrest assembly and providing additional stability and safety for the folding chair frame.

[0069] As shown in Figures 6 and 7, the drive rod is L-shaped and hinged to the chair leg assembly 100 at the corner. One end of the drive rod is hinged to the connecting rod 320, and the other end is the operating end 311. In this embodiment, the elastic limiting member is a spring plunger, and the exposed end of the spring plunger is hemispherical. Of course, other elastic limiting members or magnetic limiting members can also be used, which are not limited here. When the connecting rod drive assembly 300 drives the connecting rod 320 to lift the footrest tube assembly 200 to a predetermined position, the operating end 311 approaches the chair leg assembly 100, and the spring plunger provided in the chair leg assembly 100 can cooperate with the limiting part on the surface of the drive rod to achieve locking. The mating part can be a recess or a through hole on the surface of the tube. When unlocking, the operating end 311 of the drive rod is bent outward. After the drive rod elastically deforms, the mating part will slightly disengage from the end of the spring plunger. In some alternative embodiments, the elastic limiting member can also be provided at the hinge axis between the drive rod and the chair leg assembly 100, which will not be described in detail here.

[0070] Optionally, both the backrest support assembly 400 and the seat frame 500 include a left support portion and a right support portion arranged opposite to each other in the left-right direction. The left support portion and the right support portion only indicate the difference in orientation and do not mean that the left support portion structure of the backrest support assembly 400 and the seat frame 500 are the same, or that the right support portion structure of the two is the same.

[0071] The left support portion of the backrest support assembly 400 is hinged to the left support portion of the seat frame 500. The right support portion of the backrest support assembly 400 is hinged to the right support portion of the seat frame 500. A folding member 410 is provided between the left and right support portions of one of the backrest support assembly 400 and the seat frame 500. When folded, the folding member 410 allows the left and right support portions of the backrest support assembly 400 and the seat frame 500 to come together, and the folding member can be stored between the left and right support portions. That is to say, the folding member 410 can be disposed between the left and right support portions of the backrest support assembly 400 and connect the two respectively, or the folding member 410 can be disposed between the left and right support portions of the seat frame 500 and connect the two respectively, or two folding members 410 can be provided, with the two folding members 410 respectively disposed between the left and right support portions of the backrest support assembly 400 and between the left and right support portions of the seat frame 500. Those skilled in the art can flexibly configure it according to the situation, and no limitation is made here. In this embodiment, the folding member 410 is only described as being disposed between the left and right support portions of the backrest support assembly 400.

[0072] Optionally, the footrest assembly 200 includes a left footrest 210 and a right footrest 220 arranged in parallel, and a foldable connecting rod 230 with its two ends connected to the left footrest 210 and the right footrest 220 respectively. When folded, the foldable connecting rod allows the left footrest 210 and the right footrest 220 to come together and be stored between the left footrest 210 and the right footrest 220.

[0073] Optionally, the foldable connecting rod 230 includes two hinged first folding tubes and second folding tubes, the other end of the first folding tube is hinged to the free end of the left footrest tube 210, and the other end of the second folding tube is hinged to the free end of the right footrest tube 220.

[0074] Optionally, the left footrest tube 210 and right footrest tube 220 of the footrest tube assembly 200 each include a connected first segment 201 and a second segment 202. The first segment 201 of the footrest tube assembly 200 is hinged to the front end of the seat frame 500. As shown in FIG3, when the footrest tube assembly 200 is raised to a predetermined position, the first segment 201 of the footrest tube assembly 200 is located in the extending direction of the front end of the seat frame 500. The second segment 202 of the footrest tube assembly 200 bends toward the leg assembly 100.

[0075] Optionally, as shown in Figure 5, the drive rod includes a rod body, the operating end of which is bent and connected to the rod body. One end of the rod body is hinged to one end of the connecting rod, the middle of the rod body is hinged to the chair leg assembly, and the other end of the rod body is bent away from the chair leg assembly to form the operating end 311. When the operating end 311 is rotated around its central hinge point to a position close to the chair leg assembly 100, a gap 312 for a hand to pass through can be formed between the operating end 311 and the chair leg assembly 100, as shown in the dotted area in the figure.

[0076] Furthermore, this disclosure also provides a folding chair, which includes a folding chair frame in the first aspect and a fabric, such as Oxford cloth, disposed on the folding chair frame to provide support. The Oxford cloth is cut into a shape that adapts to the backrest support assembly 400, the seat frame 500 and the footrest tube assembly 200, and then sewn on the left and right sides to allow the tubes of the backrest support assembly 400, the seat frame 500 and the footrest tube assembly 200 to pass through.

[0077] The reasoning process for the beneficial effects of the folding chair provided in this embodiment is similar to that of the aforementioned folding chair frame, and will not be repeated here.

[0078] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Those skilled in the art should understand that this disclosure includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this disclosure will be included within the scope of the claims. Industrial applicability

[0079] In summary, the present disclosure provides a folding chair frame and a folding chair thereof, which enables independent control of the footrest and, together with the backrest, meets the different needs of users for the position of the footrest and backrest in different usage scenarios.

Claims

1. A folding chair frame comprising a seat frame, a chair leg assembly mounted to the seat frame on both left and right sides of the seat frame in a configuration to support, and a foot rest tube assembly hinged to the front side of the seat frame; characterized in that, The folding chair frame further comprises at least one connecting rod driving assembly; at least one side of the chair leg assembly corresponds to the connecting rod driving assembly; The connecting rod driving assembly comprises a driving rod assembly and a connecting rod; one end of the connecting rod away from the driving rod assembly is hinged with the foot rest pipe assembly; the driving rod assembly has an operating end; the driving rod assembly and the corresponding chair leg assembly are hinged so that the operating end and the other end of the connecting rod can rotate around the hinge; When the operating end is subjected to a first operating force away from the foot rest pipe assembly, the connecting rod driving assembly can drive the connecting rod to lift the foot rest pipe assembly to a predetermined position and lock; When the operating end is subjected to a second operating force and the foot rest pipe assembly is unlocked, the connecting rod driving assembly can drive the connecting rod to move the foot rest pipe assembly away from the predetermined position; wherein the direction of the second operating force is opposite to that of the first operating force.

2. The folding chair frame of claim 1, wherein, The driving rod assembly comprises a driving rod; one end of the driving rod is hinged with the connecting rod, and the other end of the driving rod away from the connecting rod forms the operating end; the middle part of the driving rod assembly is hinged with the corresponding chair leg assembly; when the foot rest pipe assembly reaches the predetermined position, the part connected between the driving rod and the connecting rod continuously extends in the length direction.

3. The folding chair frame of claim 2, wherein, The driving rod assembly further comprises a hinge; the driving rod and the connecting rod are hinged through the hinge; the hinge comprises two hinged connecting parts, each of which is provided with a receiving groove, and the two receiving grooves are connected with the end parts of the corresponding driving rod and connecting rod respectively; in the locked state of the foot rest pipe assembly, the main body end formed by the driving rod and the corresponding connecting part and the main body end formed by the connecting rod and the corresponding connecting part are mutually butted.

4. The folding chair frame of claim 3, wherein, One end of the connecting part is provided with two opposite side ears, and the receiving groove is located between the two side ears; the two side ears on one connecting part are arranged between the two side ears on the other connecting part, and the side ears of the two connecting parts are hinged through a penetrating pin shaft.

5. The folding chair frame of claim 4, wherein, The connecting part is bent to form the receiving groove in the shape of "U"; the side ear is integrally formed with the connecting part and extends out of the receiving groove.

6. A folding chair frame according to any one of claims 3-5, c h a r a c t e r i s e d i n that The hinge further comprises a sheath, and one connecting part is at least partially embedded in the sheath; the sheath is fixed to the end part of one of the driving rod assembly and the connecting rod.

7. The folding chair frame of claim 6, wherein, The sheath is fixed to the end part of the corresponding driving rod assembly or connecting rod through a penetrating screw and / or rivet.

8. A folding chair frame according to any one of claims 3-7, c h a r a c t e r i z e d in that In the case that the foot rest pipe assembly is in the predetermined position, the extension direction of the driving rod assembly and the extension direction of the connecting rod form an included angle of 170° to 180° with the hinge as the center.

9. The folding chair frame of claim 8, wherein, In the two end parts of the driving rod assembly and the connecting rod, the included angle between the extension direction of at least one end part and the end face of the end part is between 80° and 90°.

10. A folding chair frame according to claims 2-9, characterized in that The driving rod is L-shaped, and the corner of the driving rod is hinged to the chair leg assembly, one end of the driving rod is hinged to the connecting rod, and the other end of the driving rod is the operation end.

11. The folding chair frame of any of claims 1-10, wherein, The folding chair frame further comprises a backrest support assembly; the backrest support assembly and the seat frame each comprise left and right support portions arranged opposite to each other in the left-right direction, the left support portion of the backrest support assembly is hinged to the left support portion of the seat frame, and the right support portion of the backrest support assembly is hinged to the right support portion of the seat frame; the left and right support portions of one of the backrest support assembly and the seat frame are provided with a folding member, which can make the left and right support portions of the backrest support assembly and the seat frame close to each other when folding and can be accommodated between the left and right support portions.

12. The folding chair frame of claim 11, wherein, The footrest pipe assembly comprises left and right footrest pipes and a foldable connecting rod connected to the left and right footrest pipes at two ends, and the foldable connecting rod can make the left and right footrest pipes close to each other when folding and can be accommodated between the left and right footrest pipes.

13. The folding chair frame of claim 12, wherein, The foldable connecting rod comprises two hinged first and second folding pipes, one end of the first folding pipe away from the second folding pipe is hinged to the free end of the left footrest pipe, and one end of the second folding pipe away from the first folding pipe is hinged to the free end of the right footrest pipe.

14. The folding chair frame of any of claims 1-13, wherein, When the operation end is subjected to a second operation force, the connecting rod driving assembly can unlock the footrest pipe assembly by folding the driving rod assembly and the connecting rod.

15. The folding chair frame of any of claims 1-14, wherein, The chair leg assembly is provided with a telescopic elastic or magnetic limiting member, when the connecting rod driving assembly drives the connecting rod to lift the footrest pipe assembly to a predetermined position, the elastic or magnetic limiting member extends from the chair leg assembly and abuts against the driving connecting rod to limit the rotation of the driving connecting rod.

16. The folding chair frame of claim 15, wherein, The chair leg assembly is provided with a telescopic elastic limiting member, the elastic limiting member adopts a spring plunger, and the exposed end of the spring plunger is a hemispherical surface.

17. The folding chair frame of any of claims 1-16, wherein, The footrest pipe assembly comprises first and second segments connected to each other; the first segment of the footrest pipe assembly is hinged to the front end of the seat frame; when the footrest pipe assembly is lifted to a predetermined position, the first segment of the footrest pipe assembly is located in the extension direction of the front end of the seat frame; and the second segment of the footrest pipe assembly is bent towards the chair leg assembly.

18. The folding chair frame of any of claims 1-16, wherein, The other end of the driving rod assembly is bent away from the chair leg assembly to form the operation end; the operation end is rotated about the hinge at the middle of the driving rod assembly to a position close to the chair leg assembly, and a gap for the hand to pass through is formed between the operation end and the chair leg assembly.

19. A folding chair comprising a folding chair frame as claimed in any one of claims 1-18, characterized in that, The folding chair further comprises a fabric arranged on the folding chair frame to provide support, and the fabric is arranged on the seat frame.

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