Support mechanism and folding chair

Abstract

To provide a supporting mechanism which does not require assembly and removal.SOLUTION: The supporting mechanism includes 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, the lower supporting rod is provided with an accommodating groove, the upper supporting rod and the lower supporting rod are hinged to form a second hinge point and are rotatable in a same plane, when the supporting mechanism is folded, the upper supporting rod is rotated to be accommodated in the accommodating groove and is in close contact with the connecting rod together with the lower supporting rod, and the first hinge point and the second hinge point are located at a same end of the lower supporting rod, so that a folding rotation direction of the lower supporting rod relative to the connecting rod is the same as a folding rotation direction of the upper supporting rod relative to the connecting rod. During the unfolding and folding process of the supporting mechanism, the user rotates the upper supporting rod and the lower supporting rod without installing or removing the upper supporting rod and the lower supporting rod.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present application relates to the technical field of folding chairs, and more particularly to support mechanisms and folding chairs. [Background technology]

[0002] A folding chair is a chair designed for easy transport and storage, and has a foldable structure and chair fabric. The folding chair can be unfolded to allow users to lie down or sit for rest, or folded to save space and make transport and storage easier. Folding chairs are widely used in a variety of situations, including outdoor activities, emergency rescue, temporary seating needs, camping, travel, etc.

[0003] However, conventional folding chairs have the following drawbacks: some folding chairs require a large frame when in use, resulting in a large volume after storage and occupying a large storage space; other folding chairs have a small volume after folding and storage, but must be reassembled when folding or unfolding, which requires complicated assembly steps and requires a lot of time to assemble the folding chair before or after use. Chinese utility model patent CN216961941U discloses a moon chair including a seat and a stand, wherein the stand includes a support ring and a support base, the seat and the support ring are fixedly connected, and 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, one end of the front support frame and the connecting rod are detachably connected, and the other end of the rear support frame and the connecting rod are detachably connected, so that the support ring can be removed from the support base to reduce the space occupied by the chair after folding. Summary of the Invention [Problem to be solved by the invention]

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

[0005] Another object of the present application is to provide a folding chair that is convenient and quick to unfold and fold, in order to solve the problem that conventional folding chairs need to be assembled and disassembled when unfolding for use or folding for storage. [Means for solving the problem]

[0006] To achieve the above object, the technical means of the present application are as follows: a support mechanism includes a connecting rod, a lower support rod, and an upper support rod, the lower support rod and the connecting rod are hingedly connected to form a first hinge point, an accommodating groove is formed in the lower support rod, the upper support rod and the lower support rod are hingedly connected to form a second hinge point and are rotatable within the same plane, when the support mechanism is folded, the upper support rod rotates and is accommodated in the accommodating groove and is in close contact with the connecting rod together with the lower support rod, and the first hinge point and the second hinge point are located at the same end of the lower support rod, so that the direction of rotation of the lower support rod relative to the connecting rod when folding is the same as the direction of rotation of the upper support rod relative to the connecting rod.

[0007] In a preferred embodiment, the connecting rod includes a support cross rod and a connecting seat, the connecting seat having a first end extending horizontally and a second end extending diagonally downward, an obtuse angle being formed between the first end and the second end, the support cross rod being connected to the first end, and the lower support rod being hingedly connected to the second end, and when the support mechanism is folded, the lower support rod and the upper support rod rotate inward and are stored below the support cross rod, coming into close contact with the support cross rod.

[0008] In another preferred embodiment, a position limiting boss is provided on the second end, and the position limiting boss abuts against the lower support rod to limit the maximum extended position of the lower support rod, so that when the lower support rod is in the maximum extended position, the lower support rod and the second end are positioned on the same straight line.

[0009] Furthermore, a position limiting groove is formed at the second end, and the shape of the position limiting groove is matched with the shape of the upper support rod. When the upper support rod rotates to the maximum extension position, the upper support rod is fitted into the position limiting groove and abuts against the position limiting groove, thereby limiting the maximum extension position of the upper support rod.

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

[0011] Furthermore, a buckle is provided on the lower support rod, and an engaging protrusion is provided on the buckle, which is detachably engaged with the upper support rod and holds the upper support rod in the accommodating groove when the external force does not exceed a predetermined value.

[0012] On the other hand, the present application further provides a folding chair including a chair upholstery, a folding mechanism, and at least two support mechanisms according to any one of claims 1 to 6, wherein the folding mechanism includes a fixed part and a movable part rotatably connected to each other, the support mechanism is connected to the fixed part and the movable part, respectively, the movable part rotates circumferentially relative to the fixed part to a storage dead center form or an expansion dead center form to fold each of the support mechanisms into a straight structure or expand each of the support mechanisms to support the chair upholstery, a position limiting groove is formed in the movable part, and a position limiting block is movably provided on the fixed part, and when the movable part is in the storage dead center form or the expansion dead center form, the position limiting block fits into the position limiting groove to limit the position of the movable part in the circumferential direction, thereby maintaining the folding mechanism in the storage dead center form or the expansion dead center form.

[0013] Furthermore, the chair cloth is provided with an attachment member, and when the folding mechanism is in the deployed dead center form and each support mechanism is deployed, each attachment member is detachably connected to each upper support rod and provided on each support mechanism, and the chair cloth applies force to the connection end of each upper support rod to hold the upper support rod in the maximum deployed position.

[0014] Furthermore, the chair upholstery includes a seat cushion portion and a backrest portion, and the mounting members are provided on both the seat cushion portion and the backrest portion, the upper support rod connected to the mounting member of the seat cushion portion is arranged as a single-tube structure with a fixed length, and the upper support rod connected to the mounting member of the backrest portion is arranged as a multi-tube structure with an adjustable length, and the maximum deployed 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 a single-tube structure, and the minimum length S of the upper support rod of a multi-tube structure are all less than the distance M between the two first hinge points of the two support mechanisms symmetrically arranged at both ends of the folding mechanism when each support mechanism has a linear structure, i.e., D≦M, L≦M, S≦M. [Effects of the Invention]

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The support mechanism of the present application includes a connecting rod, a lower support rod, and an upper support rod arranged in the same plane, the lower support rod is hingedly connected to the connecting rod, the upper support rod is hingedly connected to the lower support rod, and the lower support rod is provided with an accommodation groove for accommodating the upper support rod, when the support mechanism is folded, the upper support rod rotates to be accommodated in the accommodation groove and then further rotates together with the lower support rod until it is accommodated closely against the connecting rod, the entire support mechanism has a simple structure, a small number of parts, a simplified manufacturing process, and reduced manufacturing costs, the support mechanism after folding is small in volume, compact, and requires little space, making it convenient for users to carry and store, and when the user unfolds or folds the support mechanism, they only need to rotate the upper support rod and the lower support rod without removing or attaching the upper support rod and the lower support rod, improving the convenience of use of the support mechanism. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a structural schematic diagram of a folding chair according to the present invention; [Figure 2] 1 is a schematic diagram of the structure of the folding chair (excluding the chair fabric) of the present application when unfolded. [Figure 3] 1 is a structural schematic diagram of the folding chair (not including the chair fabric) of the present application in the middle of folding. [Figure 4] 1 is a structural diagram of the folding chair (excluding the chair fabric) of the present application when folded. [Figure 5] FIG. 1 is a front view of the folding chair (not including the chair fabric) of the present application. [Figure 6] FIG. 2 is an exploded structural schematic diagram of the folding mechanism of the present application. [Figure 7] FIG. 2 is a partial exploded structural schematic diagram of the folding mechanism and the support mechanism of the present application. [Figure 8] FIG. 2 is a plan view of the folding mechanism of the present application in the deployed dead center configuration. [Figure 9] FIG. 2 is a plan view of the folding mechanism of the present application in a dead center storage configuration. [Figure 10] FIG. 2 is a cross-sectional view of the folding mechanism of the present application. [Figure 11] FIG. 10 is a cross-sectional view of the folding mechanism of the present application in another state. [Figure 12] FIG. 2 is a structural schematic diagram of the support mechanism of the present application when deployed. [Figure 13] FIG. 2 is a structural schematic diagram of the support mechanism of the present application when folded. [Figure 14] 1 is a schematic diagram of the structure of the chair upholstery of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present application will be further described below with reference to specific embodiments. It should be noted that, provided there is no contradiction, the embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0020] In the description of the present application, it should be explained that, with regard to orientation terms, the orientations and positional relationships indicated by the terms "center," "lateral," "longitudinal," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," etc. are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate and simplify the description of the present application, and do not indicate or suggest that the devices or components shown must have a specific orientation, be configured and operate in a specific orientation, and therefore should not be understood to limit the specific protection scope of the present application.

[0021] It should be understood that the terms "first," "second," etc. in the specification and claims of this application are intended to distinguish between similar objects and not necessarily to describe a particular order or priority.

[0022] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or apparatus comprising a series of steps or units is not limited to the steps or units expressly stated, but may include other steps or units that are not expressly stated or inherent to those processes, methods, products or apparatus.

[0023] As shown in Figures 1 to 4, the present application provides a folding chair 1, which includes a folding mechanism 100, a support mechanism 200, and a chair cloth 300, wherein the support mechanism 200 is connected to the folding mechanism 100, and the chair cloth 300 is detachably connected to the support mechanism 200, and the folding mechanism 100 rotates between an unfolded dead center form and a stored dead center form, whereby each support mechanism 200 assumes an X-shaped unfolded state or a straight-folded state, thereby enabling the folding chair 1 to be unfolded or folded.

[0024] Specifically, as shown in FIGS. 5 to 11, the folding mechanism 100 includes a fixed part 110 and a movable part 120 rotatably connected to each other, the movable part 120 can rotate in a circumferential direction relative to the fixed part 110, an accommodation space is formed in a hollow position inside the movable part 120, a position limiting groove 130 is formed in the movable part 120, and the position limiting groove 130 communicates with the accommodation space, and a position limiting block 140 is also movably provided on the fixed part 110, and the position limiting block 140 is located within the accommodation space and can slide up and down in a direction perpendicular to the fixed part 110 and the movable part 120. When the position limiting block 140 is fitted into the position limiting groove 130, the position limiting block 140 cooperates with the position limiting groove 130 to restrict the position of the movable part 120 in the circumferential direction and restricts the relative rotation between the movable part 120 and the fixed part 110. When the position limiting block 140 is disengaged from the position limiting groove 130, the position limiting block 140 does not cooperate with the position limiting groove 130, and the movable part 120 can rotate in the circumferential direction relative to the fixed part and the position limiting block 140. By changing the position of the position limiting block 140, the user can flexibly control whether the fixed part 110 and the movable part 120 can rotate relative to each other, thereby stably controlling whether the folding mechanism 100 can be folded.

[0025] Since the horizontal projections of the position limiting block 140 and the position limiting groove 130 are aligned in a square, the position limiting block 140 can be fitted into the position limiting groove 130 only when the movable part 120 rotates relative to the fixed part 110 and the position limiting block 140 is aligned with the position limiting groove 130, and after the position limiting block 140 is fitted into the position limiting groove 130, the position limiting block 140 and the position limiting groove 130 work together to realize circumferential positional restriction for the movable part 120. Therefore, by setting the position of the position limiting groove 130 in advance, the position limiting block 140 is aligned with the position limiting groove 130 only when the movable part 120 rotates relative to the fixed part 110 to the deployment dead center form or the storage dead center form, and the position limiting block 140 is fitted into the position limiting groove 130 and cooperates with the position limiting groove 130 to realize a circumferential position limit for the movable part 120, thereby enabling the folding mechanism 100 to be maintained in the deployment dead center form or the storage dead center form.

[0026] It should be noted that the shape and structure of the position limiting block 140 and the position limiting groove 130 are not limited. In the embodiment shown in FIG. 6, the position limiting block 140 and the position limiting groove 130 have a square structure, and in some other embodiments, the position limiting block 140 and the position limiting groove 130 may have a polygonal structure such as a rectangle, a triangle, a trapezoid, or an elliptical structure.

[0027] 6 , the folding mechanism 100 further includes an elastic member 150 disposed between the fixed portion 110 and the position limiting block 140. The elastic member 150 can move the position limiting block 140 upward. When the position limiting block 140 aligns with the position limiting groove 130, the position limiting block 140 is fitted into the position limiting groove 130 under the action of the elastic member 150, thereby realizing the circumferential position limit for the movable block. The position limiting block 140 can also be pressed downward, compressing the elastic member 150 and disengaging from the position limiting groove 130, thereby releasing the circumferential position limit for the movable block. The elastic member 150 can be made of any material, such as elastic rubber or an elastic leaf spring, that can store elastic energy and push the position limiting block 140 upward after the pressing force on the position limiting block 140 is removed. Preferably, the elastic member 150 is a compression spring, one end of which is connected to the fixed part 110 and the other end of which is connected to the position limiting block 140. When the user presses the position limiting block 140, the position limiting block 140 moves downward and disengages from the position limiting groove 130, causing the compression spring to be compressed and deformed. When the user releases the pressing block, the compression spring recovers its deformation and pushes the position limiting block 140 upward, so that when the position limiting block 140 and the position limiting groove 130 align, the position limiting block 140 is pushed up and fitted into the position limiting groove 130. With the above structure, the automatic locking function of the position limiting block 140 can be effectively realized. When the movable part 120 rotates relative to the fixed part 110 to the deployed dead center configuration or the stored dead center configuration and the position limiting block 140 aligns with the position limiting groove 130, the position limiting block 140 automatically fits into the position limiting groove 130, thereby maintaining the folding mechanism 100 in the deployed dead center configuration or the stored dead center configuration.

[0028] Further, as shown in FIG. 6 , in some preferred embodiments, the position limiting block 140 specifically includes a position limiting portion 142, a pressing portion 141 located at the upper end of the position limiting portion 142, and a connecting portion 143 located at the lower end of the position limiting portion 142. The connecting portion 143 has a cylindrical structure and has a cavity formed therein for accommodating the elastic member 150. The elastic member 150 is connected to the cavity of the connecting portion 143, thereby improving the connection stability between the elastic member 150 and the position limiting block 140. The position limiting portion 142 is fitted into the position limiting groove 130 and cooperates with the position limiting groove 130. When the pressing portion 141 is pressed or released, the position limiting portion 142 moves downward to disengage from the position limiting groove 130 or moves upward to fit into the position limiting groove 130. The folding mechanism 100 further includes a cover plate 160, which is fixedly attached to the upper end of the fixed part 110. The cover plate 160 has an escape opening 161 formed therein. The escape opening 161 has a shape that matches the shape of the pressing part 141. The position limiting block 140 has only a space that allows the pressing part 141 to extend above the cover plate 160 through the escape opening 161 and be pressed or released by the user. The cover plate 160 and the escape opening 161 can serve to limit the position of the position limiting block 140. The cover plate 160 prevents the position limiting block 140 from moving further upward after the position limiting part 142 is fitted into the position limiting groove 130. This prevents the position limiting block 140 from moving further upward under the action of the elastic member 150, causing the position limiting part 142 to come out of the position limiting groove 130 and thereby fail to serve as a position limiting part for the movable part 120.

[0029] In addition, the shapes of the pressing part 141 and the evacuation opening 161 are combined into a polygonal structure such as a square or a rectangle and an oval, and the outer wall of the pressing part 141 abuts against the inner wall of the evacuation opening 161, so that the position limiting block 140 can only slide vertically relative to the cover plate 160, the movable part 120 and the fixed part 110, and cannot rotate along the vertical direction or slide along the horizontal direction. Therefore, when the movable part 120 rotates relative to the fixed part 110, the position limiting groove 130 also rotates synchronously relative to the position limiting block 140, causing the position limiting part 142 and the position limiting groove 130 to become misaligned, and the position limiting part 142 cannot fit into the position limiting groove 130 and cooperate with the position limiting groove 130 to limit the position; only when the movable part 120 rotates to the deployment dead center form or the storage dead center form does the position limiting part 142 align with the position limiting groove 130 again, and the position limiting part 142 fits into the position limiting groove 130 to limit the position of the movable part 120; that is, the position limiting block 140 can only limit the position of the movable part 120 in the deployment dead center form or the storage dead center form in the circumferential direction.

[0030] Furthermore, the folding mechanism 100 further includes a fixed connection block 113 and a rotating connection block 123, which are connected to the support mechanism 200. There are two fixed connection blocks 113, which are attached to the fixed part 110, and there are two rotating connection blocks 123, which are attached to the movable part 120. The two fixed connection blocks 113 and the two rotating connection blocks 123 are all arranged symmetrically. When the movable part 120 rotates to the deployment dead center form relative to the fixed part 110, the two fixed connection blocks 113 and the two rotating connection blocks 123 form an X-shaped structure, and when the movable part 120 rotates to the storage dead center form relative to the fixed part 110, the two fixed connection blocks 113 and the two rotating connection blocks 123 form a linear structure. When the folding mechanism 100 is in the unfolded dead center form, the two fixed connection blocks 113 and the two rotary connection blocks 123 have an X-shaped structure, which causes each support mechanism 200 to also have an X-shape, thereby improving the structural stability and reliability of each support mechanism 200. When the folding mechanism 100 is in the retracted dead center form, the two fixed connection blocks 113 and the two rotary connection blocks 123 have a linear structure, which causes each support mechanism 200 to also have a linear shape. This makes the retracted support mechanism 200 have a compact structure and occupies a small space.

[0031] More preferably, fixed part 110 includes a base part 111, the outer edge of which is provided with a vertical protrusion 112 extending upward, and movable part 120 includes an insertion part 121, the outer wall of which is provided with a horizontal protrusion 122 extending outward, and insertion part 121 is rotatably attached to base part 111, so that when insertion part 121 rotates relative to base part 111, horizontal protrusion 122 moves toward and away from vertical protrusion 112. The above structure is simple, compact, well designed, and highly stable.

[0032] 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 restrict the relative rotation between the base part 111 and the insertion part 121. At this time, when the folding structure is in the unfolded dead center form or the retracted dead center form, the position limiting block 140 is aligned with the position limiting groove 130 and is fitted into the position limiting groove 130 to restrict the position of the movable part 120 in the circumferential direction. That is, when the folding mechanism 100 is in the unfolded dead center form or the retracted dead center form, the vertical protrusion 112 and the horizontal protrusion 122 are in a state of exact abutment. As a result, not only the position limiting block 140 and the position limiting groove 130 cooperate to restrict the position of the movable part 120, but also the vertical protrusion 112 and the horizontal protrusion 122 abut against each other to restrict the position of the movable part 120, thereby improving the position limiting effect and the stability of the structure.

[0033] The base 111 is provided with two vertical protrusions 112, each of which is provided with a fixed connection block 113. The insertion portion 121 is provided with two horizontal protrusions 122, each of which is provided with a rotary connection block 123. As shown in FIG. 8, when the folding mechanism 100 is in the unfolded dead center configuration, the two fixed connection blocks 113 are located at the front and rear ends of the base 111, respectively, and the two rotary connection blocks 123 are located at the left and right ends of the base 111, respectively, forming an X-shaped structure. As shown in FIG. 9, when the folding mechanism 100 is in the retracted dead center configuration, the two fixed connection blocks 113 are located at the left and right ends of the base 111, respectively, and the two rotary connection blocks 123 are also located at the left and right ends of the base 111, respectively, forming a straight-line structure. This structure ensures that the folding mechanism 100 can be in the X-shaped unfolded dead center configuration and the straight-line retracted dead center configuration.

[0034] In some preferred embodiments, a recess 114 is formed in the base 111, and the horizontal projections of the recess 114 and the insertion part 121 are aligned to form a perfect circle, and the lower end of the insertion part 121 is fitted into the recess 114, thereby realizing a rotatable connection between the insertion part 121 and the base 111. The above structure realizes a rotatable connection between the base 111 and the insertion part 121, and the overall structure is simple, making installation and removal convenient.

[0035] As shown in FIGS. 1 to 14 , the folding chair 1 has four support mechanisms 200, each of which 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 connected to the fixed connection block 113 via the connecting rods 210 and are cooperatively mounted on the fixed part 110. The other two of the four support mechanisms 200 are connected to the rotary connection block 123 via the connecting rods 210 and are cooperatively mounted on the movable part 120. In this way, as the movable part 120 rotates relative to the fixed part 110, each support mechanism 200 assumes an X-shaped structure when the folding mechanism 100 is in the unfolded dead center configuration, and assumes a straight-line structure when the folding mechanism 100 is in the retracted dead center configuration. The X-shape of each support mechanism 200 provides a more stable and reliable support effect after unfolding, and the straight-line shape provides a more compact and smaller volume after folding.

[0036] The support mechanism 200 itself can also be folded and unfolded, and the lower support rod 220 is hingedly connected to the connecting rod 210, and the upper support rod 230 is hingedly connected to the lower support rod 220. An accommodation groove 221 is formed in the lower support rod 220, and the lower support rod 220 and the upper support rod 230 rotate relative to the connecting rod 210 in the same plane. In this way, when the support mechanism 200 is folded, the upper support rod 230 is stored in the accommodation groove 221 and folded back below the connecting rod 210 together with the lower support rod 220 to fit closely to the connecting rod 210.

[0037] Furthermore, the lower support rod 220 and the connecting rod 210 are hingedly connected to form a first hinge point 240, and the upper support rod 230 and the lower support rod 220 are hingedly connected to form a second hinge point 250, and the first hinge point 240 and the second hinge point 250 are located at the same end of the lower support rod 220, so that the rotation direction of the lower support rod 220 folding relative to the connecting rod 210 is the same as the rotation direction of the upper support rod 230 folding relative to the connecting rod 210, and the rotation direction of the lower support rod 220 unfolding relative to the connecting rod 210 is the same as the rotation direction of the upper support rod 230 unfolding relative to the connecting rod 210. For example, as shown in FIG. 12, the lower support rod 220 and the upper support rod 230 are folded by rotating clockwise, and the lower support rod 220 and the upper support rod 230 are unfolded by rotating counterclockwise, and the lower support rod 220 and the upper support rod 230 are folded and unfolded along the same direction.

[0038] Specifically, the connecting rod 210 includes a support horizontal rod 211 and a connecting seat 212. The connecting seat 212 includes a first end 2121 extending horizontally and a second end 2122 extending diagonally downward. An obtuse angle is formed between the first end 2121 and the second end 2122. The support horizontal rod 211 is connected to the first end 2121, and the lower support rod 220 is hingedly connected to the second end 2122. The lower support rod 220 and the upper support rod 230 rotate inward and are stored below the support horizontal rod 211, and are in close contact with the support horizontal rod 211.

[0039] 11 to 13, the support horizontal rod 211 is preferably realized as a square tube structure, the lower support rod 220 as a U-shaped tube structure, and the upper support rod 230 as a circular tube structure. One end of the support horizontal rod 211 is connected to the fixed connection block 113 or the rotary connection block 123, and the other end is connected to a first end 2121 of the connection seat 212. The support horizontal rod 211 and the first end 2121 are arranged on the same line. A hinge groove 2123 is formed in the second end 2122 of the connection seat 212, and a hinge hole is formed in the center of the hinge groove 2123. The top end of the lower support rod 220 is hinged in the hinge groove 2123 by engaging a screw with the hinge hole to form a first hinge point 240.

[0040] Because the width of the hinge groove 2123 is the same as the width of the lower support rod 220, the lower support rod 220 can only rotate within the hinge groove 2123, but cannot slide within the hinge groove 2123. A position limiting boss 2124 is provided below the hinge hole of the hinge groove 2123, and the position limiting boss 2124 abuts against the lower support rod 220 to limit the maximum extended position of the lower support rod 220. When the lower support rod 220 has rotated to the maximum extended position, the lower support rod 220 abuts against the position limiting boss 2124, limiting the position of the lower support rod 220 to the maximum extended position, thereby preventing further rotation of the lower support rod 220. Preferably, a position limiting member, such as a locking block or a magnetic attraction member, is provided within the hinge groove 2123 to limit the position of the lower support rod 220 to the folded position, in order to prevent the lower support rod 220 from rotating and unfolding when the folding chair 1 is in the folded state.

[0041] The lower support rod 220 has a U-shaped tubular structure and has a receiving groove 221. The upper support rod 230 is hingedly connected to the lower support rod 220 to form a second hinge point 250. The second hinge point 250 and the first hinge point 240 are located at the same end of the lower support rod 220. When the support mechanism 200 is folded, the upper support rod 230 rotates to be folded into the receiving groove 221. When the support mechanism 200 is unfolded, the upper support rod 230 rotates to be A position limiting groove 2125 is formed on the side end of the position limiting boss 2124, which is extended outside the accommodating groove 221 and located at the second end 2122 of the connecting seat 212. The shape of the position limiting groove 2125 is adapted to the shape of the upper support rod 230. When the upper support rod 230 rotates to the maximum extended position, the upper support rod 230 fits into the position limiting groove 2125 and cooperates with the position limiting groove 2125 to limit the position of the lower support rod 220 to the maximum extended position.

[0042] Furthermore, the first end 2121 and the second end 2122 of the connecting seat 212 are integrally molded and connected, forming a 110° angle between the first end 2121 and the second end 2122. The support cross rod 211 is aligned with the first end 2121 and aligned with the second end 2122 when the lower support rod 220 is in the fully extended position. In this way, when the support mechanism 200 is extended, the lower support rod 220 rotates to the fully extended position, forming a 110° angle between the lower support rod 220 and the support cross rod 211. The position limiting groove 2125 extends diagonally upward. The upper support rod 230 rotates to the fully extended position, forming a 125° angle between the upper support rod 230 and the lower support rod 220. The upper support rod 230 supports the chair upholstery 300. With the above structure, when the folding chair 1 is unfolded, each support mechanism 200 cooperates with each other to form a trapezoidal structure, which has good structural strength and can ensure the stability of the support.

[0043] Mounting members 310 are provided at the four corners of the seat cover 300. When the folding mechanism 100 is in the unfolded dead center mode and each support mechanism 200 is unfolded, each mounting member 310 is detachably connected to the free end of each upper support rod 230 and provided on each support mechanism 200. When the seat cover 300 is unloaded or under load, the seat cover 300 applies a force to the free end of the upper support rod 230 in the unfolded rotation direction, thereby holding the upper support rod 230 at the maximum unfolded position and ensuring the structural stability of the support mechanism 200. In addition, a protrusion, a magnetic attraction member, etc. may be provided in the position limiting groove 2125 to pre-fix the upper support rod 230.

[0044] The chair upholstery 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 of the seat cushion portion 320 is arranged as a single-tube structure with a fixed length, while the upper support rod 230 connected to the mounting member 310 of the backrest portion 330 is arranged as a multi-tube structure with an adjustable length, so that after connection, the chair upholstery 300 has a structure in which the seat cushion portion 320 is low and the backrest portion 330 is high. Preferably, the multi-tube upper support rod 230 is arranged as a telescopic tube structure, and multiple tube members are fitted externally in sequence and engaged telescopically by a spring buckle. The support mechanism 200 can be adjusted to a maximum length to support the chair upholstery 300 when unfolded, and can be adjusted to a minimum length to be stored in the storage groove 221 when folded.

[0045] In some other embodiments, the multi-tube structure may be arranged as a foldable tube structure, a combination structure of a tube member and a rubber rope, etc., but after the foldable tube structure or the combination structure of a tube member and a rubber rope is adjusted to its minimum length, it has multiple tube members arranged in parallel, has a large volume, and requires a large storage groove 221, while the telescopic tube structure, after adjusted to its minimum length, has only one tube member, has a small volume, and the overall volume is smaller after the support mechanism 200 is folded.

[0046] Furthermore, as shown in FIG. 5 , the length D of the lower support rod 220, the length L of the single-tube upper support rod 230, and the minimum length S of the multi-tube upper support rod 230 are all less than the distance M between the two first hinge points 240 of the two support mechanisms 200 symmetrically arranged at both ends of the folding structure when each support mechanism 200 has a linear structure, i.e., D≦M, L≦M, S≦M, which ensures that the lower support rod 220 and the upper support rod 230 can be inverted below the folding mechanism 100 and the horizontal support rod 211 to be in close contact with the folding mechanism 100 and the horizontal support rod 211.

[0047] 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. Thus, when the support mechanism 200 is folded, the upper support rod 230 partially extends outside the receiving groove 221 of the lower support rod 220. A buckle 222 is provided at the free end of the lower support rod 220. The buckle 222 not only contacts the supporting surface to act as an anti-slip mat, but also can restrict the position of the upper support rod 230. Specifically, the buckle 222 is provided with an engaging protrusion that can detachably engage with the upper support rod 230 and retains the upper support rod 230 in the receiving groove 221 unless an external force exceeds a predetermined value. Of course, if the length of the upper support rod 230 is shorter than that of the lower support rod 220, the buckle 222 may be provided in the middle of the lower support rod 220 so as to be able to engage with the upper support rod 230, and a separate mat may be provided at the free end of the lower support rod 220, and the position of the buckle 222 may be freely adjusted according to the length of the upper support rod 230.

[0048] The steps for storing the folding chair of the present invention are specifically as follows.

[0049] In S1, the chair upholstery 300 is removed from the support mechanism 200.

[0050] In S2, the pressing portion 141 of the position limiting block 140 is pressed, and the position limiting block 140 moves downward under the action of an external force, compressing the elastic member 150, separating the position limiting portion 142 from the position limiting groove 130, and unlocking the movable portion 120.

[0051] In S3, by rotating the movable part 120 to the storage dead center position, each support mechanism 200 is positioned at both ends of the fixed part 110 to form a straight line structure, the position limiting part 142 is aligned with the position limiting groove 130, the position limiting block 140 moves upward under the action of the elastic member 150, the position limiting part 142 is automatically fitted into the position limiting groove 130, and the movable part 120 is locked again.

[0052] In S4, the support mechanisms 200 at both ends of the fixed part 110 are folded, and the upper support rods 230 and lower support rods 220 at both ends are rotated in sequence to be folded back below the horizontal support rods 211 and folding mechanism 100 and brought into close contact with the horizontal support rods 211 and folding mechanism 100, thereby completing the storage of the folding chair 1.

[0053] The specific steps for unfolding the folding chair of the present application are as follows.

[0054] In S1, the pressing portion 141 of the position limiting block 140 is pressed, and the position limiting block 140 moves downward under the action of an external force, compressing the elastic member 150, separating the position limiting portion 142 from the position limiting groove 130, and unlocking the movable portion 120.

[0055] In S2, by rotating the movable part 120 to the deployed dead center form, each support mechanism 200 is positioned at both ends of the fixed part 110 to form an X-shaped structure, the position limiting part 142 is aligned with the position limiting groove 130, the position limiting block 140 moves upward under the action of the elastic member 150, the position limiting part 142 is automatically fitted into the position limiting groove 130, and the movable part 120 is locked again.

[0056] In S3, the support mechanisms 200 on both ends of the fixed part 110 are unfolded, and the upper support rods 230 and the lower support rods 220 on both ends are rotated in order to be folded back to the maximum unfolded position.

[0057] In S4, the chair cloth 300 is attached to the support mechanism 200, thereby completing the unfolding of the folding chair 1.

[0058] During the process of unfolding and storing the folding chair 1, the user only needs to perform three operations: pressing the position limiting block 140, rotating the movable part 120, and rotating the upper support rod 230 and the lower support rod 220. There is no need to use external tools such as a screwdriver or wrench, and there is no need to remove or install rod members. The entire operation process is simple and convenient. After folding, the folding chair 1 has a straight structure, is compact and small in volume, requires little space, and is convenient for users to carry and store. After unfolding, the folding chair 1 has an X-shaped structure, which is stable and reliable, and can provide a rest space where users can sit or lie down.

[0059] The above has described 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 to the above embodiments, and that what has been described in the above embodiments and the specification merely exemplifies the principles of the present application. The present application may incorporate various modifications and improvements without departing from the spirit and scope of the present application, and all such modifications and improvements are within the scope of the present application as claimed. The scope of protection claimed by the present application is defined by the appended claims and their equivalents. [Explanation of symbols]

[0060] 1 folding chair 100 Folding mechanism 110 Fixed part 111 Base 112 Vertical protrusion 113 Fixed Connection Block 114 Groove 120 Moving parts 121 Insertion part 122 Horizontal protrusion 123 Rotating Connection Block 130 Position limiting groove 140 Position Restriction Block 141 Pressing part 142 Position restriction section 143 Connection 150 Elastic member 160 Lid plate 161 Exit 200 Support mechanism 210 Connecting Rod 211 Support horizontal rod 212 Connection seat 2121 First end 2122 Second end 2123 Hinge groove 2124 Position Restriction Boss 2125 Position limiting groove 220 Lower support rod 221 Storage groove 222 Buckle 230 Upper support rod 240 First hinge point 250 Second hinge point 300 Chair fabric 310 Mounting parts 320 Seat cushion part 330 Backrest

Claims

1. A folding chair comprising a chair fabric, a folding mechanism, and at least two support mechanisms, Includes a connecting rod, a lower support rod and an upper support rod the lower support rod and the connecting rod are hingedly connected to form a first hinge point; The lower support rod has a receiving groove formed therein. The upper support rod and the lower support rod are hinged to form a second hinge point and are rotatable in the same plane; When folding the folding chair, the upper support rod is rotated and accommodated in the accommodation groove, and is accommodated below the connecting rod together with the lower support rod, and the first hinge point and the second hinge point are located at the same end of the lower support rod, so that the folding rotation direction of the lower support rod relative to the connecting rod is the same as the folding rotation direction of the upper support rod relative to the connecting rod; the folding mechanism includes a fixed part and a movable part rotatably provided on the fixed part, the support mechanisms are connected to the fixed part and the movable part, the connecting rod of the support mechanism connected to the fixed part and the connecting rod of the support mechanism connected to the movable part are provided so as to be positioned on the same plane perpendicular to the rotation axis of the movable part, the connecting rod includes a horizontal support rod having one end connected to the fixed part or the movable part and extending horizontally, and a connecting seat connected to the other end of the horizontal support rod; The lower support rod is hingedly connected to the connecting seat; When folding the folding chair, the movable part rotates relative to the fixed part, the two support mechanisms approach each other so as to be parallel to each other, the upper support rod of the support mechanism connected to the fixed part rotates and is stored below the horizontal support rod of the support mechanism connected to the fixed part and below the folding mechanism, and the upper support rod of the support mechanism connected to the movable part rotates and is stored below the horizontal support rod of the support mechanism connected to the movable part and below the folding mechanism. A folding chair characterized by:

2. The connecting seat includes a first end extending horizontally and a second end extending diagonally downward; An obtuse angle is formed between the first end and the second end, the support cross rod is connected to the first end; the lower support rod is hingedly connected to the second end; When the folding chair is folded, the lower support rod and the upper support rod rotate inward to be stored below the horizontal support rod and closely contact the horizontal support rod.

2. The folding chair according to claim 1.

3. The second end is provided with a position limiting boss, the position limiting boss abuts against the lower support rod to limit the maximum extended position of the lower support rod, so that when the lower support rod is in the maximum extended position, the lower support rod and the second end are positioned on the same straight line.

3. The folding chair according to claim 2.

4. A position limiting groove is formed in the second end portion, The shape of the position limiting groove is matched with the shape of the upper support rod; When the upper support rod rotates to the maximum extended position, the upper support rod is fitted into the position limiting groove and abuts against the position limiting groove, thereby limiting the maximum extended position of the upper support rod.

3. The folding chair according to claim 2.

5. The upper support rod may be arranged as a single tube structure with a fixed length or as a multi-tube structure with an adjustable length.

2. The folding chair according to claim 1.

6. The lower support rod is provided with a buckle, The buckle is provided with an engagement protrusion, The engaging protrusion is detachably engaged with the upper support rod, and holds the upper support rod in the receiving groove when an external force does not exceed a predetermined value.

2. The folding chair according to claim 1.

7. The movable part rotates in a circumferential direction relative to the fixed part to a stored dead center form or an expanded dead center form, and folds each of the support mechanisms into a straight structure or expands each of the support mechanisms to support the chair fabric, a position limiting groove is formed in the movable portion; A position limiting block is movably provided on the fixed portion, When the movable part is in the storage dead center configuration or the deployment dead center configuration, the position limiting block is fitted into the position limiting groove to limit the position of the movable part in the circumferential direction, thereby maintaining the folding mechanism in the storage dead center configuration or the deployment dead center configuration.

2. The folding chair according to claim 1.

8. The chair upholstery is provided with an attachment member, When the folding mechanism is in the deployment dead center configuration and each support mechanism is deployed, each mounting member is detachably connected to each upper support rod and provided on each support mechanism, and the seat upholstery applies force to the connection end of each upper support rod to hold the upper support rod in the maximum deployment position.

8. The folding chair according to claim 7.

9. The chair fabric includes a seat cushion portion and a backrest portion, The mounting member is provided on both the seat cushion portion and the backrest portion, The upper support rod connected to the mounting member of the seat cushion portion is arranged as a single pipe structure having a fixed length, The upper support rod connected to the mounting member of the backrest portion is arranged as a multi-tube structure with an adjustable length; The maximum deployed 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.

9. The folding chair according to claim 8.

10. 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 less than or equal to the distance M between the two first hinge points of the two support mechanisms symmetrically arranged at both ends of the folding mechanism when each support mechanism has a linear structure, i.e., D≦M, L≦M, S≦M.

10. The folding chair according to claim 9.

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