Supporting mechanism and folding chair

Abstract

The utility model discloses a supporting mechanism and a folding chair, the supporting mechanism comprises a connecting rod, a lower supporting rod and an upper supporting rod, the lower supporting rod and the connecting rod are hinged to form a first hinge point, a containing groove is formed in the lower supporting rod, and the upper supporting rod and the lower supporting rod are hinged to form a second hinge point; the upper supporting rod and the lower supporting rod can rotate in the same plane, when the supporting mechanism is folded, the upper supporting rod rotates and is folded into the containing groove, the upper supporting rod and the lower supporting rod are attached to the connecting rod together, and the first hinge point and the second hinge point are located at the same end of the lower supporting rod. The rotating folding direction of the lower supporting rod relative to the connecting rod is the same as the rotating folding direction of the upper supporting rod relative to the connecting rod. In the unfolding and folding process of the supporting mechanism, a user only needs to rotate the upper supporting rod and the lower supporting rod, the upper supporting rod and the lower supporting rod do not need to be assembled and disassembled, and the supporting mechanism is convenient and rapid to unfold and fold.

Description

Technical Field

[0001] The present application relates to the technical field of folding chairs, and in particular to a support mechanism and a folding chair. Background Art

[0002] A folding chair is a seat designed for easy carrying and storage. It has a foldable structure and a chair cloth. The folding chair can be unfolded for users to lie down or sit and rest, and can also be folded up to save space and be easy to carry and store. Folding chairs are widely used in various occasions, including outdoor activities, emergency rescue, temporary seating needs, camping, travel, etc.

[0003] However, the existing folding chairs have the following defects: some folding chairs have a large volume after being stored due to their large number of frames during use, and the storage space occupied is also relatively large; other folding chairs are small in volume after being folded and stored, but need to be reassembled when folded and unfolded, and the assembly steps are cumbersome, resulting in the folding chairs taking a long time to assemble before or after use. Chinese utility model patent CN216961941U discloses a moon chair, including a seat and a bracket, the bracket includes a support ring and a support base, the seat and the support ring are fixedly connected, the support base and the support ring are detachably connected, the support base includes a front support frame, a connecting rod and a rear support frame, the front support frame and one end of the connecting rod are detachably connected, and the rear support frame and the other end of the connecting rod are detachably connected, and then the support ring and the support base can be disassembled, so that the folded chair occupies less space. Summary of the invention

[0004] One object of the present application is to provide a support mechanism that does not require assembly or disassembly.

[0005] Another object of the present application is to provide a folding chair that is convenient and quick to unfold and fold, so as to solve the problem that the existing folding chairs need to be assembled and disassembled when unfolded or folded.

[0006] To achieve the above objectives, the technical solution adopted in the present application is: a support mechanism, including a connecting rod, a lower support rod and an upper support rod, the lower support rod and the connecting rod are hinged to form a first hinge point, and the lower support rod is provided with a accommodating groove, the upper support rod and the lower support rod are hinged to form a second hinge point, the upper support rod and the lower support rod can rotate in the same plane, so that when the support mechanism is folded, the upper support rod is rotated and folded into the accommodating groove and fits against the connecting rod together with the lower support rod, the first hinge point and the second hinge point are located at the same end of the lower support rod, so that the rotation and folding direction of the lower support rod relative to the connecting rod is the same as the rotation and folding direction of the upper support rod relative to the connecting rod.

[0007] Preferably, the connecting rod includes a supporting cross bar and a connecting seat, the connecting seat includes a first end extending in a horizontal direction and a second end extending obliquely downward, an obtuse angle is formed between the first end and the second end, the supporting cross bar is connected to the first end, and the lower support rod is hinged to the second end, and when the supporting mechanism is folded, the lower support rod and the upper support rod can be rotated inward and folded under the supporting cross bar and fit with the supporting cross bar.

[0008] As another preference, a limiting boss is provided on the second end portion, and the limiting boss is suitable for abutting against the lower support rod to limit its maximum expanded position, so that when the lower support rod is in the maximum expanded position, the lower support rod and the second end portion are located on the same straight line.

[0009] Furthermore, a limiting groove is provided on the second end portion, and the shape of the limiting groove is adapted to the shape of the upper support rod. When the upper support rod is rotated to the maximum expanded position, the upper support rod is suitable for being embedded in the limiting groove and abutting against the limiting groove to limit the maximum expanded position of the upper support rod.

[0010] Furthermore, the upper support rod may be configured as a single-tube structure with a fixed length; or, the upper support rod may be configured as a multi-tube structure with an adjustable length.

[0011] Furthermore, a buckle is provided on the lower support rod, and a snap-in protrusion is provided on the buckle, and the snap-in protrusion is suitable for detachably engaging with the upper support rod to keep the upper support rod in the accommodating groove when the external force does not exceed a preset value.

[0012] On the other hand, the present application also provides a folding chair, comprising a chair cloth, a folding mechanism and at least two supporting mechanisms as described in any one of claims 1 to 7, wherein the folding mechanism comprises a fixed part and a movable part that are rotatably connected to each other, the supporting mechanisms are respectively connected to the fixed part and the movable part, the movable part can be circumferentially rotated relative to the fixed part to a folded dead point shape or an unfolded dead point shape so that each of the supporting mechanisms can be folded into a straight-line structure or unfolded to support the chair cloth, a limiting groove is provided on the movable part, and a limiting block is movably provided on the fixed part, and the limiting block is suitable for being embedded in the limiting groove to circumferentially limit the movable part when the movable part is in the folded dead point shape or the unfolded dead point shape, so as to maintain the folding mechanism in the folded dead point shape or the unfolded dead point shape.

[0013] Furthermore, a mounting part is provided on the chair cloth. When the folding mechanism is in the unfolding dead point form and each supporting mechanism is unfolded, each mounting part is detachably connected to each upper support rod and is provided on each supporting mechanism, and the chair cloth is suitable for applying a force to the connecting end of each upper support member to keep the upper support rod in the maximum unfolded position.

[0014] Furthermore, the chair fabric includes a seat cushion portion and a backrest portion, and the seat cushion portion and the backrest portion are both provided with the mounting parts. The upper support rod connected to the mounting parts on the seat cushion portion is configured as a single-tube structure with a fixed length, and the upper support rod connected to the mounting parts on the backrest portion is configured as a multi-tube structure with adjustable length. The maximum expansion length of the upper support rod of the multi-tube structure is greater than that of the upper support rod of the single-tube structure.

[0015] Furthermore, the length D of the lower support rod, the length L of the upper support rod of the single-tube structure, and the minimum length S of the upper support rod of the multi-tube structure are not greater than the distance M between the two first hinge points in the two support mechanisms symmetrically arranged at both ends of the folding mechanism when each of the support mechanisms is in a straight-line structure, that is, D≤M, L≤M, S≤M.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] The support mechanism of the present application includes a connecting rod, a lower supporting rod and an upper supporting rod arranged in the same plane, the lower supporting rod is hinged to the connecting rod, the upper supporting rod is hinged to the lower supporting rod, and the lower supporting rod is also provided with a receiving groove for accommodating the upper supporting rod. When the support mechanism is folded, the upper supporting rod can be rotated and folded into the receiving groove, and further rotated and folded together with the lower supporting rod to fit with the connecting rod. The entire support mechanism has a simple structure and a small number of parts, which simplifies the manufacturing process and reduces the manufacturing cost. The folded support mechanism is small and compact, and the space required is also small, which is convenient for users to carry and store. When the user unfolds or folds the support mechanism, it only needs to rotate the upper supporting rod and the lower supporting rod, and there is no need to disassemble or install the upper supporting rod and the lower supporting rod, which improves the convenience of use of the support mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the folding chair of this application.

[0019] Figure 2 This is a schematic diagram of the structure of the folding chair (excluding the chair fabric) of the present application when unfolded.

[0020] Figure 3 This is a structural schematic diagram of the folding chair (excluding the seat fabric) of the present application in the intermediate folding state.

[0021] Figure 4This is a schematic diagram of the structure of the folding chair (excluding the chair cloth) of the present application when folded.

[0022] Figure 5 This is a front view of the folding chair (excluding the chair fabric) of this application.

[0023] Figure 6 It is a schematic diagram of the exploded structure of the folding mechanism in this application.

[0024] Figure 7 It is a schematic diagram of the partial explosion structure of the folding mechanism and the supporting mechanism in this application.

[0025] Figure 8 It is a top view of the folding mechanism in the present application when it is in the unfolded dead point state.

[0026] Fig. 9 It is a top view of the folding mechanism in the present application when it is in the folded dead point state.

[0027] Fig.10 It is a cross-sectional view of the folding mechanism in this application.

[0028] Fig.11 It is a cross-sectional view of the folding mechanism in another state in this application.

[0029] Fig.12 It is a schematic diagram of the structure when the support mechanism in this application is unfolded;

[0030] Fig.13 This is a schematic diagram of the structure when the support mechanism in this application is folded;

[0031] Fig.14 This is a schematic diagram of the structure of the chair cloth in this application.

[0032] In the figure: 1, folding chair; 100, folding mechanism; 110, fixed part; 111, chassis; 112, vertical protrusion; 113, fixed connection block; 114, recessed groove; 120, movable part; 121, plug-in part; 122, horizontal protrusion; 123, rotating connection block; 130, limit groove; 140, limit block; 141, pressing part; 142, limit part; 143, connection part; 150, elastic member; 160, cover plate; 161, yielding opening; 200 , supporting mechanism; 210, connecting rod; 211, supporting cross bar; 212, connecting seat; 2121, first end; 2122, second end; 2123, hinge groove; 2124, limiting boss; 2125, limiting groove; 220, lower supporting rod; 221, receiving groove; 222, buckle; 230, upper supporting rod; 240, first hinge point; 250, second hinge point; 300, chair cloth; 310, mounting piece; 320, seat cushion; 330, backrest. DETAILED DESCRIPTION

[0033] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0034] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application 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 cannot be understood as limiting the specific scope of protection of the present application.

[0035] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0036] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0037] like Figure 1-4 As shown, the present application provides a folding chair 1, which includes a folding mechanism 100, a supporting mechanism 200 and a chair cloth 300, wherein the supporting mechanism 200 is connected to the folding mechanism 100, and the chair cloth 300 is detachably connected to the supporting mechanism 200, and the folding mechanism 100 can rotate between an unfolded dead point form and a folded dead point form, so that each supporting mechanism 200 is in an X-shaped unfolded state or a straight-line folded state, thereby realizing the unfolding or folding of the folding chair 1.

[0038] Specifically, Figure 5-11As shown, the folding mechanism 100 includes a fixed portion 110 and a movable portion 120 that are rotatably connected to each other. The movable portion 120 can rotate circumferentially relative to the fixed portion 110. The movable portion 120 is hollow inside to form an accommodation space. A limiting groove 130 is provided on the movable portion 120. The limiting groove 130 is connected to the accommodation space. A limiting block 140 is also movably provided on the fixed portion 110. The limiting block 140 is located in the accommodation space and can be vertically rotated relative to the fixed portion 110 and the movable portion 120. The movable part 120 can be circumferentially limited by sliding up and down in the vertical direction to make the limiting block 140 embedded in or out of the limiting groove 130. When the limiting block 140 is embedded in the limiting groove 130, the limiting block 140 cooperates with the limiting groove 130 to limit the circumferential position of the movable part 120 and limit the relative rotation of the movable part 120 and the fixed part 110. When the limiting block 140 is out of the limiting groove 130, the limiting block 140 does not cooperate with the limiting groove 130, and the movable part 120 can rotate circumferentially relative to the fixed seat and the limiting block 140. The user can flexibly control whether the fixed part 110 and the movable part 120 can rotate relative to each other by changing the position of the limiting block 140, so as to stably control whether the folding mechanism 100 can be folded.

[0039] The horizontal projections of the limiting block 140 and the limiting groove 130 are in a matching square shape, so that when the movable part 120 rotates relative to the fixed part 110 so that the limiting block 140 and the limiting groove 130 are aligned, the limiting block 140 can be inserted into the limiting groove 130, and once the limiting block 140 is inserted into the limiting groove 130, the limiting block 140 and the limiting groove 130 cooperate to achieve circumferential positioning of the movable part 120. Therefore, the position of the limiting groove 130 can be preset so that the limiting block 140 and the limiting groove 130 are aligned only when the movable part 120 rotates relative to the fixed part 110 to the unfolded dead point form or the folded dead point form, and the limiting block 140 can be inserted into the limiting groove 130 and cooperate with the limiting groove 130 to achieve circumferential positioning of the movable part 120, thereby maintaining the folding mechanism 100 in the unfolded dead point form or the folded dead point form.

[0040] It is worth mentioning that the shape and structure of the limiting block 140 and the limiting groove 130 are not limited. Figure 6 In the illustrated embodiment, the limit block 140 and the limit groove 130 are of a square structure, while in other embodiments, the limit block 140 and the limit groove 130 may also be of a polygonal structure such as a rectangle, triangle, trapezoid or an elliptical structure.

[0041] exist Figure 6In the illustrated embodiment, the folding mechanism 100 further includes an elastic member 150, which is disposed between the fixing portion 110 and the limiting block 140. The elastic member 150 can drive the limiting block 140 to move upward, so that when the limiting block 140 and the limiting groove 130 are aligned, the limiting block 140 can be embedded in the limiting groove 130 under the action of the elastic member 150 to achieve circumferential limiting of the movable block, and the limiting block 140 can also be pressed to move downward to compress the elastic member 150 and disengage from the limiting groove 130 to release the circumferential limiting of the movable block. The elastic member 150 can be selected to be any material that has elastic energy storage and can push the limiting block 140 upward after the pressing force of the limiting block 140 is removed, such as elastic rubber, elastic spring, etc. Preferably, the elastic member 150 is a compression spring, one end of which is connected to the fixed portion 110, and the other end of which is connected to the limit block 140. When the user presses the limit block 140, the limit block 140 moves downward and disengages from the limit slot 130, and the compression spring is compressed and deformed. When the user releases the pressing block, the compression spring recovers its deformation to push the limit block 140 upward, and when the limit block 140 and the limit slot 130 are aligned, the limit block 140 is pushed and embedded into the limit slot 130. The above structure can effectively realize the automatic locking function of the limit block 140: once the movable portion 120 rotates relative to the fixed portion 110 to the extended dead point form or the retracted dead point form so that the limit slot 130 and the limit slot 130 are aligned, the limit block 140 can automatically be embedded in the limit slot 130, and the folding mechanism 100 is maintained in the extended dead point form or the retracted dead point form.

[0042] Furthermore, if Figure 6As shown, in some preferred embodiments, the limit block 140 specifically includes a limit portion 142 and a pressing portion 141 located at the upper end of the limit portion 142 and a connecting portion 143 at the lower end of the limit portion 142, the connecting portion 143 is a cylindrical structure and is hollow inside to form a cavity for accommodating the elastic member 150, the elastic member 150 is connected to the cavity of the connecting portion 143 to increase the connection stability between the elastic member 150 and the limit block 140, the limit portion 142 is suitable for being embedded in the limit groove 130 and cooperating with the limit groove 130, and the pressing portion 141 is suitable for being pressed or released to make the limit portion 142 move down to disengage from the limit groove 130 or move up to be embedded in the limit groove 130. The folding mechanism 100 also includes a cover plate 160, which is fixedly mounted on the upper end of the fixing portion 110. A clearance opening 161 is opened on the cover plate 160, and the shape of the clearance opening 161 is adapted to the pressing portion 141. In the limit block 140, only the pressing portion 141 can pass through the clearance opening 161 and extend to the top of the cover plate 160 to be pressed or released by the user. The cover plate 160 and the clearance opening 161 can limit the limit block 140. The cover plate 160 can prevent the limit block 140 from moving further upward after the limit portion 142 is embedded in the limit groove 130, so as to prevent the limit block 140 from moving further upward under the action of the elastic member 150, causing the limit portion 142 to detach from the limit groove 130 and fail to limit the movable portion 120.

[0043] In addition, the shapes of the pressing portion 141 and the clearance opening 161 are compatible polygonal structures such as squares, rectangles, and ellipses, and the outer wall of the pressing portion 141 abuts against the inner wall of the clearance opening 161, so that the limit block 140 can only slide in the vertical direction relative to the cover plate 160, the movable portion 120 and the fixed portion 110, and the limit block 140 cannot rotate in the vertical direction or slide in the horizontal direction. Therefore, when the movable part 120 rotates relative to the fixed part 110, the limit groove 130 will also rotate synchronously relative to the limit block 140, and the limit part 142 is misaligned with the limit groove 130. The limit part 142 cannot be embedded in the limit groove 130 to cooperate with the limit groove 130 for limiting. Only when the movable part 120 rotates to the expanded dead point form or the retracted dead point form, the limit part 142 is aligned with the limit groove 130 again, and the limit part 142 can be embedded in the limit groove 130 to limit the movable part 120. In other words, the limit block 140 only performs circumferential limiting on the movable part 120 in the expanded dead point form and the retracted dead point form.

[0044] Furthermore, the folding mechanism 100 also includes a fixed connecting block 113 and a rotating connecting block 123, which are used to connect with the supporting mechanism 200. The fixed connecting block 113 has two and is installed on the fixed part 110, and the rotating connecting block 123 has two and is installed on the movable part 120. The two fixed connecting blocks 113 and the two rotating connecting blocks 123 are symmetrically arranged. When the movable part 120 rotates to the expanded dead point shape relative to the fixed part 110, the two fixed connecting blocks 113 and the two rotating connecting blocks 123 are in an X-shaped structure. When the movable part 120 rotates to the folded dead point shape relative to the fixed part 110, the two fixed connecting blocks 113 and the two rotating connecting blocks 123 are in a straight line structure. When the folding mechanism 100 is in the unfolded dead point form, the two fixed connecting blocks 113 and the two rotating connecting blocks 123 are in an X-shaped structure, which can make each supporting mechanism 200 also be arranged in an X-shape, thereby improving the structural stability and reliability of each supporting mechanism 200; when the folding mechanism 100 is in the folded dead point form, the two fixed connecting blocks 113 and the two rotating connecting blocks 123 are in a straight line structure, which can make each supporting structure also be arranged in a straight line, so that the folded supporting mechanism 200 has a compact structure and occupies a small space.

[0045] Further preferably, the fixed part 110 includes a chassis part 111, and a vertical protrusion 112 extending upward is provided on the outer edge of the chassis part 111. The movable part 120 includes a plug-in part 121, and a horizontal protrusion 122 extending outward is provided on the outer side wall of the plug-in part 121. The plug-in part 121 is rotatably mounted on the chassis part 111. When the plug-in part 121 rotates relative to the chassis part 111, the horizontal protrusion 122 approaches or moves away from the vertical protrusion 112. The above structure is simple and compact, ingeniously designed, and highly stable.

[0046] like Figure 8 -, when the vertical protrusion 112 and the horizontal protrusion 122 abut against each other, the vertical protrusion 112 and the horizontal protrusion 122 cooperate to limit the relative rotation of the chassis 111 and the plug-in portion 121, and at this time the folding structure is in the unfolding dead point form or the folding dead point form, the limit block 140 is aligned with the limit groove 130 and is embedded in the limit groove 130 to circumferentially limit the movable part 120. In other words, when the folding mechanism 100 is in the unfolding dead point form or the folding dead point form, the vertical protrusion 112 and the horizontal protrusion 122 are just in abutting state, so that in addition to the limit block 140 and the limit groove 130 cooperating to limit the movable part 120, the vertical protrusion 112 and the horizontal protrusion 122 abut against each other to limit the movable part 120, thereby improving the limiting effect and the stability of the structure.

[0047] The chassis portion 111 is provided with two vertical protrusions 112, each of which is provided with a fixed connection block 113, and the plug-in portion 121 is provided with two horizontal protrusions 122, each of which is provided with a rotating connection block 123. Figure 8 As shown, when in the deployed dead point configuration, the two fixed connection blocks 113 are respectively located at the front and rear ends of the chassis portion 111, and the two rotating connection blocks 123 are respectively located at the left and right ends of the chassis portion 111, thereby forming an X-shaped structure; Fig. 9 As shown, when in the folded dead point configuration, the two fixed connection blocks 113 are respectively located at the left and right ends of the chassis 111, and the two rotating connection blocks 123 are also respectively located at the left and right ends of the chassis 111, thereby forming a straight-line structure. The above structure reliably forms the folding mechanism 100 in an X-shaped unfolding dead point configuration and a straight-line folded dead point configuration.

[0048] It is worth mentioning that in some preferred embodiments, a recessed groove 114 is provided on the chassis 111, and the horizontal projections of the recessed groove 114 and the plug-in portion 121 are in a matching perfect circle, and the lower end of the plug-in portion 121 can be embedded in the recessed groove 114, thereby realizing a rotatable connection between the plug-in portion 121 and the chassis 111. The above structure is used to realize the rotatable connection between the chassis 111 and the plug-in portion 121, and the overall structure is simple and easy to install and disassemble.

[0049] like Figure 1-14 As shown, the folding chair 1 has four support mechanisms 200, each support mechanism 200 includes a connecting rod 210, a lower support rod 220 and an upper support rod 230 arranged in the same plane, two of the four support mechanisms 200 are arranged on the fixed part 110 through the connection and cooperation between the connecting rod 210 and the fixed connection block 113, and the other two of the four support mechanisms 200 are arranged on the movable part 120 through the connection and cooperation between the connecting rod 210 and the rotating connection block 123, and then the movable part 120 rotates relative to the fixed part 110 so that each support mechanism 200 is in an X-shaped structure when the folding mechanism 100 is in the unfolded dead point form, and each support mechanism 200 is in a straight line structure when the folding mechanism 100 is in the folded dead point form. Each support mechanism 200 is arranged in an X-shaped shape, which can provide a more stable and reliable support effect after each support mechanism 200 is unfolded; each support mechanism 200 is arranged in a straight line, which can provide a more compact and small volume after each support mechanism 200 is folded.

[0050] The support mechanism 200 itself can also be folded and unfolded, the lower support rod 220 is hinged to the connecting rod 210, the upper support rod 230 is hinged to the lower support rod 220, and a receiving groove 221 is provided on the lower support rod 220. The lower support rod 220 and the upper support rod 230 are suitable for rotating relative to the connecting rod 210 in the same plane. When the support mechanism 200 is folded, the upper support rod 230 is folded into the receiving groove 221, and folded together with the lower support rod 220 to the bottom of the connecting rod 210 and fit the connecting rod 210.

[0051] Further, the lower support rod 220 is hinged with the connecting rod 210 to form a first hinge point 240, and the upper support rod 230 is hinged with the lower support rod 220 to form a second hinge point 250. The first hinge point 240 and the second hinge point 250 are arranged at the same end of the lower support rod 220, so that the rotation and folding direction of the lower support rod 220 relative to the connecting rod 210 is the same as the folding direction of the upper support rod 230 relative to the connecting rod 210, and the rotation and unfolding direction of the lower support rod 220 relative to the connecting rod 210 is the same as the rotation and unfolding direction of the upper support rod 230 relative to the connecting rod 210. For example, Fig.12 As shown, the lower support rod 220 and the upper support rod 230 rotate and fold in the clockwise direction, and rotate and unfold in the counterclockwise direction. The lower support rod 220 and the upper support rod 230 are folded or unfolded in the same direction.

[0052] Specifically, the connecting rod 210 includes a supporting cross bar 211 and a connecting seat 212. The connecting seat 212 includes a first end 2121 extending in a horizontal direction and a second end 2122 extending obtusely downward. An obtuse angle is formed between the first end 2121 and the second end 2122. The supporting cross bar 211 is connected to the first end 2121, and the lower support rod 220 is hinged to the second end 2122. The lower support rod 220 and the upper support rod 230 can be rotated inward and folded to the bottom of the supporting cross bar 211 and fit with the supporting cross bar 211.

[0053] Preferably, Figure 11-13 In the illustrated embodiment, the support cross bar 211 is implemented as a square tube structure, the lower support bar 220 is implemented as a U-shaped tube structure, and the upper support bar 230 is implemented as a round tube structure. One end of the support cross bar 211 is connected to the fixed connection block 113 or the rotating connection block 123, and the other end of the support cross bar 211 is connected to the first end 2121 of the connection seat 212, and the support cross bar 211 and the first end 2121 are arranged on the same straight line, and the second end 2122 of the connection seat 212 is provided with a hinge groove 2123, and the middle part of the hinge groove 2123 is provided with a hinge hole, and the top end of the lower support bar 220 is hinged in the hinge groove 2123 by screws and the hinge hole, forming a first hinge point 240.

[0054] The width of the hinge slot 2123 is the same as that of the lower support rod 220, so that the lower support rod 220 can only rotate in the hinge slot 2123, but cannot slide in the hinge slot 2123. The hinge slot 2123 is provided with a limiting boss 2124 below the hinge hole. The limiting boss 2124 is suitable for abutting against the lower support rod 220 to limit the maximum unfolding position of the lower support rod 220. When the lower support rod 220 rotates to the maximum unfolding position, the lower support rod 220 abuts against the limiting boss 2124, and the lower support rod 220 is limited to the maximum unfolding position to prevent the lower support rod 220 from further rotating. Preferably, a limiting member for limiting the lower support rod 220 in the folding position, such as a block, a magnetic member, etc., is provided in the hinge slot 2123 to prevent the lower support rod 220 from rotating and unfolding when the folding chair 1 is in the folded state.

[0055] The lower support rod 220 is a U-shaped tube structure, and the lower support rod 220 has a receiving groove 221. The upper support rod 230 is hinged on the lower support rod 220 to form a second hinge point 250. The second hinge point 250 and the first hinge point 240 are arranged at the same end of the lower support rod 220. When the support mechanism 200 is folded, the upper support rod 230 can be rotated and folded into the receiving groove 221. When the support mechanism 200 is unfolded, the upper support rod 230 is rotated and unfolded to the outside of the receiving groove 221. The second end 2122 of the connecting seat 212 is provided with a limiting groove 2125 at the side end of the limiting boss 2124. The shape of the limiting groove 2125 is adapted to the shape of the upper support rod 230. When the upper support rod 230 is rotated to the maximum unfolded position, the upper support rod 230 is suitable for being embedded in the limiting groove 2125 and cooperating with the limiting groove 2125 to limit the lower support rod 220 to the maximum unfolded position.

[0056] Further, the first end 2121 and the second end 2122 of the connecting seat 212 are integrally connected, and an angle of 110° is formed between the first end 2121 and the second end 2122. The support cross bar 211 and the first end 2121 are arranged on the same straight line, and the lower support bar 220 is arranged on the same straight line with the second end 2122 when it is in the maximum unfolding position. Then, when the support mechanism 200 is unfolded, the lower support bar 220 rotates to the maximum unfolding angle, and an angle of 110° is formed between the lower support bar 220 and the support cross bar 211. The limiting groove 2125 extends upward obliquely, and the upper support bar 230 rotates to the maximum unfolding position, and the upper support bar 230 and the lower support bar 220 form an angle of 125°, and the upper support bar 230 supports the chair fabric 300. Based on the above structure, when the folding chair 1 is unfolded, each support mechanism 200 cooperates with each other to form a trapezoidal structure, and the trapezoidal structure has good structural strength and can ensure the stability of the support.

[0057] The four corners of the chair fabric 300 are provided with mounting parts 310. When the folding mechanism 100 is in the unfolded four-point configuration and each supporting mechanism 200 is unfolded, each mounting part 310 is detachably connected to the free end of each upper supporting rod 230 and is arranged on each supporting mechanism 200. When the chair fabric 300 is unloaded or loaded, the chair fabric 300 will exert a force in the unfolding rotation direction on the free end of the upper supporting rod 230, thereby keeping the upper supporting rod 230 in the maximum unfolded position to ensure the structural stability of the supporting mechanism 200. In addition, a protrusion, a magnetic attraction part, etc. can be arranged in the limiting groove 2125 to pre-fix the upper supporting rod 230.

[0058] The chair fabric 300 includes a seat cushion portion 320 and a backrest portion 330, both of which are provided with mounting members 310. The upper support rod 230 connected to the mounting member 310 on the seat cushion portion 320 is configured as a single-tube structure with a fixed length, and the upper support rod 230 connected to the mounting member 310 on the backrest portion 330 is configured as a multi-tube structure with an adjustable length, so that the chair fabric 300 has a structure with a low seat cushion portion 320 and a high backrest portion 330 after being connected. Preferably, the upper support rod 230 of the multi-tube structure is configured as a telescopic tube structure, with multiple tubes being sequentially sleeved and telescopically connected by spring buckles. When the support mechanism 200 is unfolded, it can be adjusted to a maximum length to support the chair fabric 300, and when the support mechanism 200 is folded, it can be adjusted to a minimum length and folded into the receiving groove 221.

[0059] In some other embodiments, the multi-tube structure can also be configured as a folding tube structure, a tube and elastic rope combination structure, etc., but after the folding tube structure, the tube and elastic rope structure are adjusted to the minimum length, there will be multiple tubes arranged side by side, which are larger in size, and the required accommodating groove 221 is also larger. After the telescopic tube structure is adjusted to the minimum length, there is only one tube, which is compact in size, so that the overall volume of the support mechanism 200 is even smaller after being folded.

[0060] Furthermore, if Figure 5 As shown, the length D of the lower support rod 220, the length L of the upper support rod 230 of the single-tube structure, and the minimum length S of the upper support rod 230 of the multi-tube structure are all no greater than the distance M between the two first hinge points 240 shown in the two support mechanisms 200 symmetrically arranged at both ends of the folding structure when each support mechanism 200 is in a straight line structure, that is, D≤M, L≤M, S≤M, thereby ensuring that the lower support rod 220 and the upper support rod 230 can be flipped to the bottom of the folding mechanism 100 and the support cross bar 211, and fit with the folding mechanism 100 and the support cross bar 211.

[0061] In this embodiment, the length of the upper support rod 230 of the single-tube structure and the minimum length of the upper support rod 230 of the multi-tube structure are greater than the length of the lower support rod 220, and when the support mechanism 200 is folded, the upper support rod 230 will partially extend outside the receiving groove 221 of the lower support rod 220, and the free end of the lower support rod 220 is provided with a buckle 222, which is suitable for contacting with the placement plane to play the role of an anti-slip foot pad, and the buckle 222 can limit the upper support rod 230. Specifically, a clamping protrusion is provided on the buckle 222, and the clamping protrusion is suitable for detachably clamping with the upper support rod 230, so as to keep the upper support rod 230 in the receiving groove 221 when the external force does not exceed a preset value. Of course, if the length of the upper support rod 230 is smaller than the length of the lower support rod 220, the buckle 222 can be set in the middle of the lower support rod 220 so that it can cooperate with the upper support rod 230, and a foot pad is set at the free end of the lower support rod 220. The setting position of the buckle 222 can be freely adjusted according to the length of the upper support rod 230.

[0062] The folding steps of the folding chair of the present application are as follows:

[0063] S1, removing the chair cloth 300 from the supporting mechanism 200;

[0064] S2, pressing the pressing portion 141 of the limiting block 140, the limiting block 140 moves downward under the action of external force and compresses the elastic member 150, so that the limiting portion 142 is separated from the limiting groove 130, and the movable portion 120 is unlocked;

[0065] S3, rotating the movable part 120 to the dead point of the retraction, so that each support mechanism 200 is located at both ends of the fixed part 110 in a straight line structure, the limiting part 142 is aligned with the limiting groove 130, the limiting block 140 moves upward under the action of the elastic member 150, and the limiting part 142 is automatically embedded in the limiting groove 130, so as to re-lock the movable part 120;

[0066] S4, fold the support mechanisms 200 at both ends of the fixing portion 110, and rotate and fold the upper support rods 230 and the lower support rods 220 at both ends to the bottom of the support cross bar 211 and the folding mechanism 100 in turn and fit with the support cross bar 211 and the folding mechanism 100, thereby completing the folding of the folding chair 1.

[0067] The unfolding steps of the folding chair of this application are as follows:

[0068] S1. Press the pressing portion 141 of the limiting block 140. The limiting block 140 moves downward under the action of an external force and compresses the elastic member 150, so that the limiting portion 142 is separated from the limiting groove 130, and the movable portion 120 is unlocked;

[0069] S2, rotating the movable part 120 to expand the dead point shape, so that each support mechanism 200 is located at both ends of the fixed part 110 in an X-shaped structure, the limiting part 142 is aligned with the limiting groove 130, the limiting block 140 moves upward under the action of the elastic member 150, and the limiting part 142 is automatically embedded in the limiting groove 130, so as to re-lock the movable part 120;

[0070] S3, unfolding the support mechanisms 200 at both ends of the fixing portion 110, and rotating and folding the upper support rods 230 and the lower support rods 220 at both ends to the maximum unfolded position in sequence;

[0071] S4, installing the chair cloth 300 onto the supporting mechanism 200, and completing the unfolding of the folding chair 1.

[0072] During the unfolding and folding process of the folding chair 1, the user only needs to perform three operations: pressing the limit block 140, rotating the movable part 120, and rotating the upper support rod 230 and the lower support rod 220. No external tools such as screwdrivers and wrenches are required, and there is no need to disassemble and install the rods. The entire operation process is simple and convenient. The folded folding chair 1 has a straight-line structure, which is compact and small, and requires very little space, making it convenient for users to carry and store. The unfolded folding chair 1 has an X-shaped structure, which is stable and reliable, and can provide users with a sitting or lying rest space.

[0073] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A support mechanism, characterized in that: The folding mechanism is a complex structure, and the folding mechanism is a complex structure. The folding mechanism is a complex structure, and the folding mechanism is a complex structure. The folding mechanism is a complex structure, and the folding mechanism is a complex structure. The folding mechanism is a complex structure, and the folding mechanism is a complex structure. The folding mechanism is a complex structure, and the folding mechanism is a complex structure.

2. The support mechanism according to claim 1, characterized in that: The connecting rod includes a supporting cross bar and a connecting seat, the connecting seat includes a first end extending in a horizontal direction and a second end extending obliquely downward, an obtuse angle is formed between the first end and the second end, the supporting cross bar is connected to the first end, and the lower supporting rod is hinged to the second end, and when the supporting mechanism is folded, the lower supporting rod and the upper supporting rod can be rotated inward and folded under the supporting cross bar and fit with the supporting cross bar.

3. The support mechanism according to claim 2, characterized in that: A limiting boss is provided on the second end portion, and the limiting boss is suitable for abutting against the lower support rod to limit its maximum expansion position, so that when the lower support rod is in the maximum expansion position, the lower support rod and the second end portion are located on the same straight line.

4. The support mechanism according to claim 2, characterized in that: A limiting groove is provided on the second end portion, and a shape of the limiting groove is adapted to a shape of the upper support rod. When the upper support rod is rotated to a maximum expanded position, the upper support rod is adapted to be embedded in the limiting groove and abut against the limiting groove to limit the maximum expanded position of the upper support rod.

5. The support mechanism according to claim 1, characterized in that: The upper support rod may be configured as a single-tube structure with a fixed length; or, the upper support rod may be configured as a multi-tube structure with adjustable length.

6. The support mechanism according to claim 1, characterized in that: The lower support rod is also provided with a buckle, and the buckle is provided with a clamping protrusion, and the clamping protrusion is suitable for detachably engaging with the upper support rod, so as to keep the upper support rod in the accommodating groove when the external force does not exceed a preset value.

7. A folding chair, characterized in that: It includes a chair cloth, a folding mechanism and at least two supporting mechanisms as described in any one of claims 1 to 6, wherein the folding mechanism includes a fixed part and a movable part which are rotatably connected to each other, the supporting mechanism is respectively connected to the fixed part and the movable part, the movable part can be circumferentially rotated relative to the fixed part to a folded dead point shape or an unfolded dead point shape so that each of the supporting mechanisms can be folded into a straight-line structure or unfolded to support the chair cloth, a limiting groove is provided on the movable part, and a limiting block is movably provided on the fixed part, and the limiting block is suitable for being embedded in the limiting groove to circumferentially limit the movable part when the movable part is in the folded dead point shape or the unfolded dead point shape, so as to maintain the folding mechanism in the folded dead point shape or the unfolded dead point shape.

8. The folding chair according to claim 7, characterized in that: The chair cloth is provided with mounting parts. When the folding mechanism is in the unfolding dead point form and each supporting mechanism is unfolded, each mounting part is detachably connected to each upper supporting rod and is arranged on each supporting mechanism, and the chair cloth is suitable for applying a force to the connecting end of each upper supporting part to keep the upper supporting rod in the maximum unfolding position.

9. The folding chair according to claim 8, characterized in that: The chair fabric includes a seat cushion portion and a backrest portion, and the seat cushion portion and the backrest portion are both provided with the mounting parts. The upper support rod connected to the mounting parts on the seat cushion portion is configured as a single-tube structure with a fixed length, and the upper support rod connected to the mounting parts on the backrest portion is configured as a multi-tube structure with adjustable length. The maximum expansion length of the upper support rod of the multi-tube structure is greater than that of the upper support rod of the single-tube structure.

10. The folding chair according to claim 9, characterized in that: The length D of the lower support rod, the length L of the upper support rod of the single-tube structure, and the minimum length S of the upper support rod of the multi-tube structure are all no greater than the distance M between the two first hinge points in the two support mechanisms symmetrically arranged at both ends of the folding mechanism when each of the support mechanisms is in a straight-line structure, that is, D≤M, L≤M, S≤M.

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