Folding chair frame and folding chair thereof

Abstract

The utility model discloses a folding chair frame and a folding chair thereof, and relates to the technical field of folding chairs, the folding chair frame comprises a seat frame, a chair leg assembly, a footrest pipe assembly and a connecting rod driving assembly; the connecting rod driving assembly comprises a driving rod assembly and a connecting rod piece which are hinged. One end of the connecting rod is hinged with the footrest pipe assembly; the driving rod assembly is provided with an operation end. The driving rod assemblies are hinged to the corresponding chair leg assemblies; under the condition that the operation end is subjected to a first operation force, the connecting rod driving assembly can drive the connecting rod piece to lift the footrest pipe assembly to a preset position and lock the footrest pipe assembly; under the condition that the operation end is subjected to second operation force and the footrest pipe assembly is unlocked, the connecting rod driving assembly can drive the connecting rod piece to drive the footrest pipe assembly to move in the direction away from the preset position; wherein the direction of the second operating force is opposite to that of the first operating force; independent control of the footrest can be realized, and different requirements of a user on the positions of the footrest and the backrest in different use scenes can be met by matching with the backrest.

Description

Technical Field

[0001] The utility model relates to the technical field of folding chairs, in particular to a folding chair frame and a folding chair. Background Art

[0002] In the prior art, the traditional folding chair design usually includes two parts: a backrest and a footrest. These chairs are designed to allow a mechanical linkage relationship between the backrest and the footrest to simplify the folding mechanism of the chair. Specifically, when the backrest is tilted backward from the vertical state to the lying flat state, this linkage mechanism will automatically lift the footrest. Conversely, when the backrest is lifted forward from the lying flat state to the non-lying vertical state, the footrest will form a linkage with the backrest and fall down accordingly, instead of remaining in the raised position.

[0003] This linkage structure brings certain limitations in practical applications. For example, when a user sits on a folding chair with the backrest in an upright position, the lifting of the footrest is synchronized with the tilting of the backrest, so the user cannot use 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 lying flat, their feet can only be placed on the footrest raised by the linkage mechanism, and they cannot bend and place their feet on the bottom surface, which limits the user's comfort and the use scenario of the chair to a certain extent.

[0004] In view of this, technicians in this field need to develop a folding chair frame and a folding chair in which the footrest can be separated from the backrest and can be independently controlled to meet the different needs of users for the footrest position in different usage scenarios. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model provides a folding chair frame and a folding chair thereof, which can realize independent control of the footrest and cooperate with the backrest to meet the different needs of users for the footrest and backrest positions in different usage scenarios.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a folding chair frame, comprising a seat frame, a chair leg assembly installed on the left and right sides of the seat frame for support, and a footrest tube assembly hinged on the front side of the seat frame; the folding chair frame also includes at least one connecting rod drive assembly; at least one side of the chair leg assembly corresponds to the connecting rod drive assembly;

[0007] The connecting rod driving assembly comprises a driving rod assembly and a connecting rod member which are hinged to each other; one end of the connecting rod member which is away from the driving rod assembly is hinged to the footrest tube assembly; the driving rod assembly has an operating end; the driving rod assembly and the corresponding chair leg assembly are hinged to enable the operating end and the other end of the connecting rod member to rotate around the hinge;

[0008] When the operating end is subjected to a first operating force away from the footrest tube assembly, the connecting rod driving assembly can drive the connecting rod member to lift the footrest tube assembly to a predetermined position and lock it;

[0009] When the operating end is subjected to a second operating force and the footrest tube assembly is unlocked, the connecting rod driving assembly can drive the connecting rod to drive the footrest tube assembly to move away from the predetermined position; wherein the direction of the second operating force is opposite to the direction of the first operating force.

[0010] Optionally, the driving rod assembly includes a driving rod; one end of the driving rod is hinged to the connecting rod member, and the other end of the driving rod is away from the connecting rod member to form the operating end; the middle part of the driving rod assembly is hinged to the corresponding chair leg assembly; when the footrest tube assembly reaches the predetermined position, the portion connected between the driving rod and the connecting rod member extends continuously in the length direction.

[0011] Optionally, the driving rod assembly also includes a hinge; the driving rod and the connecting rod are hingedly connected via 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 corresponding ends of the driving rod and the connecting rod; when the footrest tube assembly is locked, the main body end composed of the driving rod and the corresponding connecting part is butted against the main body end composed of the connecting rod and the corresponding connecting part.

[0012] Optionally, two opposite side ears are provided at one end of the connecting part, and the accommodating 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 hingedly connected by a pin shaft.

[0013] Optionally, the hinged member further comprises a sheath, wherein one connecting portion is at least partially embedded in the sheath; the sheath is fixed to an end of one of the driving rod assembly and the connecting rod member.

[0014] Optionally, when the footrest tube assembly is in a predetermined position, with the hinge as the center, an angle of 170° to 180° is formed between the extension direction of the driving rod assembly and the extension direction of the connecting rod.

[0015] Optionally, among the two ends of the driving rod assembly and the connecting rod member that are connected to each other, at least one end has an angle between its end surface and the end face of the end in the extension direction of its length ranging from 80° to 90°.

[0016] Optionally, the folding chair frame also includes a backrest support assembly; the backrest support assembly and the seat frame both include a left support portion and a right support portion arranged relative 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; 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, and the folding member can bring the left support portion and the right support portion of the backrest support assembly and the seat frame closer together when folded, and the folding member can be stored between the left support portion and the right support portion.

[0017] Optionally, the footrest tube assembly includes a left footrest tube and a right footrest tube, and a foldable connecting rod with two ends respectively connecting the left footrest tube and the right footrest tube, wherein the foldable connecting rod can bring the left footrest tube and the right footrest tube closer together and can be stored between the left footrest tube and the right footrest tube when folded.

[0018] Optionally, when the operating end is subjected to a second operating force, the connecting rod driving assembly can unlock the footrest tube assembly by folding the driving rod assembly and the connecting rod member.

[0019] Optionally, the chair leg assembly is provided with a retractable elastic limiter or a magnetic limiter. When the connecting rod driving assembly drives the connecting rod to lift the footrest tube assembly to a predetermined position, the elastic limiter or the magnetic limiter extends from the chair leg assembly and abuts against the driving connecting rod to limit the rotation of the driving connecting rod.

[0020] Optionally, the footrest tube assembly includes a first section and a second section that are connected; the first section of the footrest tube assembly is hinged to the front end of the seat frame; when the footrest tube assembly is lifted to a predetermined position, the first section of the footrest tube assembly is located in the extension direction of the front end of the seat frame; the second section of the footrest tube assembly is bent in a direction close to the chair leg assembly.

[0021] Optionally, the other end of the driving rod assembly is bent in a direction away from the chair leg assembly to form the operating end; the operating end is rotated to a position close to the chair leg assembly with the hinge in the middle of the driving rod assembly as the center, and a gap for a hand to pass through can be formed between the operating end and the chair leg assembly.

[0022] In addition, the present invention also provides a folding chair, the folding chair comprising any of the above-mentioned folding chair frames and a fabric provided on the folding chair frame for providing support, the fabric being arranged on a seat frame. The reasoning process of the beneficial effects of the folding chair provided by the present invention and the above-mentioned folding chair frame is similar, and will not be repeated here.

[0023] These features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. The best implementation or means of the utility model will be fully presented in conjunction with the drawings, but it is not a limitation of the technical solution of the utility model. In addition, these features, elements and components appearing in each of the following texts and drawings are multiple, and are marked with different symbols or numbers for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a schematic structural diagram of the folding chair of the utility model in the left-right direction, wherein the footrest tube assembly is not raised.

[0026] Figure 2 It is a schematic diagram of the structure of the folding chair of the utility model, wherein the footrest tube assembly is not raised.

[0027] Figure 3 It is a schematic structural diagram of the folding chair of the utility model in the left-right direction, wherein the footrest tube assembly is lifted to a predetermined position.

[0028] Figure 4 It is a partial enlarged view of the folding chair of the utility model at the driving rod assembly, the connecting rod member, and the hinge member.

[0029] Figure 5 This is a bottom view of the folding chair described in this embodiment, showing the gap between the operating end and the footrest tube assembly.

[0030] Figure 6 Schematic diagram of the structure of the folding chair in some embodiments.

[0031] Figure 7 for Figure 6 The sectional view along the E-E direction shows the cross-section of the driving rod and the connecting rod.

[0032] Among them, 100, chair leg assembly; 200, footrest tube assembly; 201, first section; 202, second section; 210, left footrest tube; 220, right footrest tube; 230, foldable connecting rod; 300, connecting rod drive assembly; 310, drive rod assembly; 311, operating end; 312, gap; 320, connecting rod member; 330, hinge; 331, connecting part; 332, side ear; 340, cover; 400, backrest support assembly; 410, folding member; 500, seat frame. DETAILED DESCRIPTION

[0033] The following is a detailed description of embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0037] References to "one embodiment" or "an example" or "an example" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment disclosed in the present utility model. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0038] Example:

[0039] As a first aspect of the present invention, a folding chair frame is provided. Figure 1 , Figure 2 and Figure 3 As shown, the folding chair frame includes the following parts: a backrest support assembly 400 for providing back support, a seat frame 500 forming the seat body, and a chair leg assembly 100 installed on the left and right sides of the seat frame 500 for supporting. In addition, in order to enhance the comfort and convenience during use, a footrest tube assembly 200 hinged on the front side of the seat frame 500 is specially provided.

[0040] Specifically, the backrest support assembly 400 is a key part of the entire folding chair frame. It not only provides the 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 part when the user sits or lies down. When the folding chair is fully opened, it is set horizontally as a whole to ensure the user's comfortable experience.

[0041] When the folding chair is fully opened and can be used for sitting or lying, the seat frame 500 is arranged horizontally as a whole. In a preferred embodiment, considering the principle of ergonomics, the front side of the seat frame 500 is slightly higher than the rear side, so as to adapt to the sitting posture more naturally and reduce the pressure on the legs and back.

[0042] As for the folding method, the folding chair frame provides flexible and varied options. According to the specific needs and usage scenarios of the user, the seat frame 500 can be folded in a convenient left-right folding method and / or an efficient front-back flipping method to facilitate storage and deployment in different directions. The design does not limit the specific folding method, and aims to provide maximum flexibility of use.

[0043] The two ends of the lower side of the backrest support assembly 400 are respectively hinged to the two ends of the rear side of the chair frame 500. An armrest assembly is provided between the backrest support assembly 400 and the chair leg assembly 100. The middle parts of the left and right sides of the backrest assembly can be linked with the chair leg assembly 100 through the armrest assembly. For example, the middle parts of the left and right sides of the backrest assembly are respectively connected to the rear ends of the corresponding armrest assemblies through hinges, and the armrest assembly as a whole can be set horizontally, or the front end can be slightly higher than the rear end, and can even be kept parallel to the chair frame 500. The middle section of the armrest assembly is connected to the top of the chair leg assembly 100 through a hinge.

[0044] In some embodiments, a plurality of hinge grooves are provided at the bottom of the armrest assembly, and a hinge shaft that can be matched with the hinge grooves is provided at the top of the leg assembly 100. By selecting one of the hinge grooves to be combined with the hinge shaft, the connection between the armrest assembly and the leg assembly 100 can be disassembled, thereby adjusting the angle of the backrest assembly.

[0045] In addition, when the chair leg assembly 100 is folded, the back support and the chair leg assembly 100 can be linked via the armrest assembly, so that the upper end of the back support assembly 400 tilts forward and approaches the front of the seat frame 500 .

[0046] The folding chair frame further includes at least one connecting rod driving assembly 300, and at least one of the chair leg assemblies 100 on one side corresponds to the connecting rod driving assembly 300. This means that among the chair leg assemblies 100 on both sides of the chair frame 500, the connecting rod driving assembly 300 can be installed on the chair leg assemblies 100 on either side, or one connecting rod driving assembly 300 can be installed on each of the chair leg assemblies 100 on both sides, so that the user can choose to use one of them.

[0047] In some embodiments, the chair leg assembly 100 on both sides of the chair frame 500 is composed of a front chair leg and a rear chair leg hinged at the upper end, and the chair leg assembly 100 on one side is taken as an example for explanation. In the chair leg assembly 100 on this side, the middle position of the front chair leg is sequentially provided with two mounting holes that penetrate along the left and right direction of the folding chair from top to bottom, which are the first mounting hole and the second mounting hole. The middle position of the chair frame 500 is hinged to the first mounting hole through a pivot, such as a rivet, a bolt and a nut. In the chair leg assembly 100 on this side, the middle position of the rear chair leg is provided with a third mounting hole and a fourth mounting hole that penetrate along the left and right direction of the folding chair. 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 through an L-shaped hinge. The L-shaped hinge has three axial holes, which are distributed in a triangular shape, two of which are fixed to the corresponding mounting holes by anchors, and the other axial hole is hinged to the lower ends of the two sides of the backrest assembly and one of the rear sides of the seat frame 500 by a pivot, such as rivets, bolts and nuts. The hinge between the lower ends of the two sides of the backrest assembly and the rear side of the seat frame 500 is also near the pivot of the L-shaped hinge.

[0048] In some embodiments, the connecting rod driving assembly 300 includes a driving rod assembly 310 and a connecting rod member 320 that are hinged to each other. One end of the connecting rod member 320 away from the driving rod assembly 310 is hinged to the footrest tube assembly, and the other end of the connecting rod member 320 opposite to the driving rod assembly 310 is hinged to the driving rod assembly 310. The driving rod assembly has an operating end and the operating end is away from the other end of the connecting rod. The middle part of the driving rod assembly is hinged to the corresponding chair leg assembly, so that the operating end and the other end of the connecting rod member can rotate around the hinge.

[0049] Specifically, the driving rod assembly 310 includes a driving rod and a hinged member disposed at one end of the driving rod, wherein the one end of the driving rod is hinged to one end of the connecting rod through the hinged member, and the other end of the driving rod is away from the connecting rod to form the operating end. The middle portion of the driving rod and the second mounting hole on the front leg of the chair leg assembly 100 are connected by a pivot, such as a rivet, a bolt, or a nut.

[0050] In this embodiment, the hinge position between the connecting rod member 320 and the footrest tube assembly 200 is located in the middle of the footrest tube assembly 200, and is a distance away from the hinge position between the footrest tube assembly 200 and the front side of the seat frame 500, so that the other end of the connecting rod member 320 can drive the footrest tube assembly 200 to rotate around the front side of the seat frame 500.

[0051] For the convenience of explanation, Figure 1 As shown, in this embodiment, point A is the hinge axis between the middle of the driving rod assembly 310 and the front leg in the chair leg assembly 100, point B is the hinge axis between the other end of the connecting rod member 320 and the middle of the footrest tube assembly 200, point C is the hinge axis between the driving rod assembly 310 and the connecting rod member 320 (located on the side ear 332 of the hinge 330); point D is the hinge axis between the front side of the seat frame assembly and the footrest tube assembly 200.

[0052] When a first operating force away from the footrest tube assembly 200 is applied to the operating end 311, the footrest tube assembly 200 can be lifted and reach a predetermined position, where the angle between the footrest tube assembly 200 and the seat frame 500 is opened to the maximum, or the footrest tube assembly 200 is lifted to the set highest position, and the footrest tube assembly 200 is locked, so that the drive rod assembly 310 and the connecting rod member 320 extend continuously in the length direction. That is, after the footrest tube assembly 200 is opened to the maximum angle, the force of the footrest tube assembly 200 on the connecting rod drive assembly 300 is mainly transmitted along its length direction and acts on the hinge between the drive rod assembly 310 and the front chair leg. The connecting rod member 320 has almost no torque on its corresponding vertical plane.

[0053] When the second operating force is applied to the operating end 311, the footrest tube assembly 200 can be unlocked, and the footrest tube assembly 200 moves away from the predetermined position, that is, the angle between the footrest tube assembly 200 and the seat frame 500 is closed to the minimum, or the free end of the footrest tube assembly 200 is placed at the lowest position, for example, the free end hangs vertically and falls on the ground, and at the same time, the driving rod assembly 310 and the connecting rod member 320 are folded between the footrest tube assembly 200 and the seat frame 500. Here, with the operating end as a reference, the direction of the second operating force is opposite to the direction of the first operating force.

[0054] In some embodiments, Figure 4As shown, the hinge 330 includes two hinged connection parts 331, and each connection part 331 has a receiving groove for connecting with the end of one of the driving rod assembly 310 and the connecting rod member 320. The ends of the driving rod assembly 310 and the connecting rod member 320 are inserted into their respective corresponding receiving grooves and connected by screws. When the footrest tube assembly is locked, the end of the main body composed of the driving rod assembly and the corresponding connection part and the end of the main body composed of the connecting rod member and the corresponding connection part are butted and fitted with each other, so that the force applied to the connecting rod member 320 can pass through the fitting surface, and at the same time, the self-locking between the driving rod assembly 310 and the connecting rod member 320 is achieved by designing a suitable angle of the fitting surface, thereby putting the footrest tube assembly in a locked state.

[0055] In some embodiments, the hinged member includes two side ears 332 disposed opposite to each other at one end of each connecting portion 331, and the receiving groove is 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 by a pin. In this embodiment, the connecting portion 331 is formed by bending a sheet metal part, that is, a U-shaped receiving groove is formed by bending, and the side ears 332 are formed integrally with the connecting portion 331 and extend outward from the receiving groove for a distance, so as to avoid motion interference when installing the end of the driving rod assembly 310 or the connecting rod member 320, and when the two rotate relative to each other.

[0056] In some embodiments, the hinge 330 further includes a sheath 340, wherein one of the connecting parts 331 is at least partially embedded in the sheath 340. Specifically, the sheath 340 is also formed by bending a sheet metal part, and the size of the U-shaped groove formed by the sheath 340 when bending is just enough to fit the surface of the connecting part 331. By setting a sheath 340 on the surface of the connecting part 331, the connection is strengthened and stabilized. As required, one or more sheaths 340 outside the two connecting parts 331 can be set. The sheath 340 can be set outside one of the connecting parts 331, or the sheath 340 can be set outside both connecting parts 331 at the same time. Similarly, the sheath 340 is fixed to the ends of the corresponding drive rod assembly and the connecting rod by screws and / or rivets.

[0057] In some embodiments, Figure 3As shown, when the footrest tube assembly 200 is lifted to a predetermined position, the main body formed by the driving rod assembly 310 and the connecting rod member 320 extends to both sides respectively, with the hinge 330 as the center, and the extending direction of the driving rod assembly 310 and the extending direction of the connecting rod member 320 form an angle of 170° to 180°, and 176° is used as an example in the figure. On the vertical plane corresponding to the connecting rod driving assembly 300, even if the extending direction of the driving rod assembly 310 and the extending direction of the connecting rod member 320 form an angle of 170° to 180°, the connecting rod member 320 can have almost no torque or less torque on its corresponding vertical plane. However, the torque can also be reduced by increasing the width of the connecting rod member 320, and the width is shown as d in the figure.

[0058] In some embodiments, at least one of the two ends of the drive rod assembly 310 and the connecting rod 320 connected to each other has an angle between the end face of the end in the direction of its length extension and 80° to 90°. For example, to form an angle of 176° between the extension direction of the drive rod assembly 310 and the extension direction of the connecting rod 320, the angle between the end face of the drive rod assembly 310 and the direction of its length extension can be 90°, and the angle between the end face of the connecting rod 320 and the direction of its length extension can be 86°. Similarly, the two can also be interchangeable. Alternatively, the angle between the end face of the drive rod assembly 310 and the direction of its length extension is 88°, and the angle between the end face of the connecting rod 320 and the direction of its length extension is also 88°. In some alternative embodiments, the above two ends can also be the end of the main body composed of the drive rod assembly and the corresponding connecting part and the end of the main body composed of the connecting rod and the corresponding connecting part, which will not be described one by one here.

[0059] Regarding the locking method of the footrest tube assembly, in addition to creating a mechanical dead zone or dead point by forming a specific angle between the driving rod assembly 310 and the connecting rod member 320 when docking, thereby realizing self-locking of the driving rod assembly 310 and the connecting rod member 320 and fixing the footrest tube assembly, other additional components can also 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 driving assembly 300 drives the connecting rod member 320 to lift the footrest tube assembly 200 to a predetermined position, the elastic limiter or magnetic limiter extends from the chair leg assembly 100, abuts or contacts the driving connecting rod member 320 to limit the rotation of the driving connecting rod member 320, which can also achieve effective fixation and locking of the footrest tube assembly, providing additional stability and safety for the folding chair frame.

[0060] like Figure 6 and Figure 7As shown, the driving rod is L-shaped, which is hinged to the chair leg assembly 100 at the corner, one end of the driving rod is hinged to the connecting rod 320, and the other end is the operating end 311. The elastic limiter adopts a spring plunger, and the exposed end of the spring plunger is a hemispherical surface. When the connecting rod driving assembly 300 drives the connecting rod 320 to lift the footrest tube assembly 200 to a predetermined position, the operating end 311 is close to the chair leg assembly 100, and the spring plunger arranged in the chair leg assembly 100 can cooperate with the limiting part on the surface of the driving rod to achieve locking. The matching part can be a recessed part or a through hole on the surface of the pipe. When unlocking, let the operating end 311 of the driving rod bend outward, and after the driving rod is elastically deformed, the matching part will be slightly separated from the end of the spring plunger. In some alternative embodiments, the elastic limiter can also be arranged at the hinge axis of the driving rod and the chair leg assembly 100, which will not be described one by one here.

[0061] In some embodiments, the backrest support assembly 400 and the seat frame 500 both include a left support portion and a right support portion that are disposed opposite to each other in the left-right direction. The left support portion and the right support portion only represent the difference in orientation, and do not mean that the left support portion structures of the backrest support assembly 400 and the seat frame 500 are the same, or the right support portion structures of the two are the same.

[0062] 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 support portion and the right support portion of one of the backrest support assembly 400 and the seat frame 500, and the folding member 410 can bring the left support portion and the right support portion of the backrest support assembly 400 and the seat frame 500 closer together when folded, and the folding member can be stored between the left support portion and the right support portion. That is to say, the folding member 410 can be arranged between the left support part and the right support part of the backrest support assembly 400 and connect the two respectively, or the folding member 410 can be arranged between the left support part and the right support part of the seat frame 500 and connect the two respectively, or two folding members 410 are provided, and the two folding members 410 are respectively arranged between the left support part and the right support part of the backrest support assembly 400 and between the left support part and the right support part of the seat frame 500. The staff in this field can flexibly arrange it according to the situation, and it is not limited here. In this embodiment, the folding member 410 is only described by taking the way of being arranged between the left support part and the right support part of the backrest support assembly 400 as an example.

[0063] In some embodiments, the footrest tube assembly 200 includes a left footrest tube 210 and a right footrest tube 220 arranged in parallel, and a foldable connecting rod 230 with two ends respectively connecting the left footrest tube 210 and the right footrest tube 220. The foldable connecting rod can bring the left footrest tube 210 and the right footrest tube 220 closer together and can be stored between the left footrest tube 210 and the right footrest tube 220 when folded.

[0064] Specifically, the foldable connecting rod 230 includes two hinged first 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 .

[0065] In some embodiments, the left footrest tube 210 and the right footrest tube 220 of the footrest tube assembly 200 each include a first section 201 and a second section 202 connected to each other. The first section 201 of the footrest tube assembly 200 is hinged to the front end of the seat frame 500. Figure 3 As shown, when the footrest tube assembly 200 is lifted to a predetermined position, the first section 201 of the footrest tube assembly 200 is located in the extension direction of the front end of the chair frame 500. The second section 202 of the footrest tube assembly 200 is bent toward the direction close to the chair leg assembly 100.

[0066] In some embodiments, as shown in FIG. 5 , the driving rod includes a rod body, the operating end 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 in a direction away from the chair leg assembly to form the operating end 311. When the operating end 311 rotates to a position close to the chair leg assembly 100 with the hinge in the middle as the center, 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.

[0067] In addition, the utility model also provides a folding chair, which includes a folding chair frame according to the first aspect and a fabric arranged on the folding chair frame for providing support, such as Oxford cloth, the Oxford cloth is cut into a shape that is compatible with the back support assembly 400, the seat frame 500 and the footrest tube assembly 200, and then a cloth cover is sewn on the left and right sides to allow the pipes of the back support assembly 400, the seat frame 500 and the footrest tube assembly 200 to pass through.

[0068] The reasoning process of the beneficial effects of the folding chair provided by the present invention and the aforementioned folding chair frame is similar, and will not be repeated here.

[0069] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention shall be included in the scope of the claims.

Claims

1. A folding chair frame, comprising a seat frame, a chair leg assembly mounted on the left and right sides of the seat frame for support, and a footrest tube assembly hinged on 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 member which are hinged to each other; one end of the connecting rod member which is away from the driving rod assembly is hinged to the footrest tube assembly; the driving rod assembly has an operating end; the driving rod assembly and the corresponding chair leg assembly are hinged to enable the operating end and the other end of the connecting rod member to rotate around the hinge; When the operating end is subjected to a first operating force away from the footrest tube assembly, the connecting rod driving assembly can drive the connecting rod member 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 connecting rod driving assembly can drive the connecting rod to drive the footrest tube assembly to move away from the predetermined position; wherein the direction of the second operating force is opposite to the direction of the first operating force.

2. The folding chair frame according to claim 1, characterized in that: The driving rod assembly includes a driving rod; one end of the driving rod is hinged to the connecting rod member, and the other end of the driving rod is away from the connecting rod member to form the operating end; the middle part of the driving rod assembly is hinged to the corresponding chair leg assembly; when the footrest tube assembly reaches the predetermined position, the part connected between the driving rod and the connecting rod member extends continuously in the length direction.

3. The folding chair frame according to claim 2, characterized in that: The driving rod assembly also includes a hinge; the driving rod and the connecting rod are hingedly connected via 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 corresponding ends of the driving rod and the connecting rod; when the footrest tube assembly is locked, the main body end composed of the driving rod and the corresponding connecting part is butted against the main body end composed of the connecting rod and the corresponding connecting part.

4. The folding chair frame according to claim 3, characterized in that: One end of the connection part is provided with two opposite side ears, and the accommodating groove is located between the two side ears; the two side ears on one connection part are arranged between the two side ears on the other connection part, and the side ears of the two connection parts are hinged by a pin shaft.

5. The folding chair frame according to claim 3, characterized in that: The hinged member further comprises a sheath, wherein one connecting portion is at least partially embedded in the sheath; the sheath is fixed to an end of one of the driving rod assembly and the connecting rod member.

6. The folding chair frame according to claim 3, characterized in that: When the footrest tube assembly is in a predetermined position, with the hinge as the center, an angle of 170° to 180° is formed between the extending direction of the driving rod assembly and the extending direction of the connecting rod.

7. The folding chair frame according to claim 6, characterized in that: Among the two ends of the driving rod assembly and the connecting rod member that are connected to each other, at least one end has an angle between its end surface and the end face of the end in the extension direction of its length that is between 80° and 90°.

8. The folding chair frame according to claim 1, characterized in that: The folding chair frame also includes a backrest support assembly; the backrest support assembly and the seat frame both include a left support portion and a right support portion that are relatively arranged 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, and the folding member can bring the left support portion and the right support portion of the backrest support assembly and the seat frame closer together when folded, and the folding member can be stored between the left support portion and the right support portion.

9. The folding chair frame according to claim 8, characterized in that: The footrest tube assembly includes a left footrest tube and a right footrest tube, and a foldable connecting rod with two ends respectively connecting the left footrest tube and the right footrest tube. When folded, the foldable connecting rod can bring the left footrest tube and the right footrest tube closer together and can be stored between the left footrest tube and the right footrest tube.

10. The folding chair frame according to claim 1, characterized in that: In the case where the operating end is subjected to a second operating force, the connecting rod driving assembly can unlock the footrest tube assembly by folding the driving rod assembly and the connecting rod member.

11. The folding chair frame according to claim 1, characterized in that: The chair leg assembly is provided with a retractable elastic limiter or a magnetic limiter. When the connecting rod driving assembly drives the connecting rod to lift the footrest tube assembly to a predetermined position, the elastic limiter or the magnetic limiter extends from the chair leg assembly and abuts against the driving connecting rod to limit the rotation of the driving connecting rod.

12. The folding chair frame according to any one of claims 1 to 11, characterized in that: The footrest tube assembly includes a first section and a second section that are connected; the first section of the footrest tube assembly is hinged to the front end of the seat frame; when the footrest tube assembly is lifted to a predetermined position, the first section of the footrest tube assembly is located in the extension direction of the front end of the seat frame; the second section of the footrest tube assembly is bent in a direction close to the chair leg assembly.

13. The folding chair frame according to any one of claims 1 to 11, characterized in that: The other end of the driving rod assembly is bent in a direction away from the chair leg assembly to form the operating end; the operating end is rotated to a position close to the chair leg assembly with the hinge in the middle of the driving rod assembly as the center, and a gap for a hand to pass through can be formed between the operating end and the chair leg assembly.

14. A folding chair, comprising a folding chair frame according to any one of claims 1 to 13, characterized in that: The folding chair also includes a fabric disposed on the folding chair frame for providing support, wherein the fabric is arranged on a seat frame.

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