Folding chair

Abstract

The utility model discloses a folding chair, and relates to the technical field of folding chair structures, the folding chair comprises a first folding body, a second folding body and a supporting part, the first folding body and the second folding body are configured to be in openable connection through a first connecting assembly, and when the first folding body is turned over to a folded state relative to the second folding body, the supporting part is opened; the first connecting assembly enables the first folding body to be maintained in the folded state relative to the second folding body under the action of the pre-tightening force of the first connecting assembly, the supporting part comprises a third folding body and a fourth folding body, and the third folding body and the fourth folding body are configured to be connected with the first folding body in an opening and closing mode through the second connecting assembly. And when the third folding body or the fourth folding body is overturned to a folding state, the second connecting assembly provides pre-tightening force to act on the third folding body or the fourth folding body. According to the folding chair, under the condition that other locking structures are not additionally arranged, the chair in a folded state can be self-locked and is convenient to transport, and the use comfort is improved.

Description

Technical Field

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

[0002] In the existing folding chairs with soft upholstery, the backrest and the seat frame are mostly connected by Japanese buckles as functional parts. Although Japanese buckles can solve the opening and closing functions of folding chairs with soft upholstery, they cannot be locked after returning to their original position, that is, they cannot be self-locking after folding, and are easily turned into an open state during transportation. In addition, the legs of chairs with soft upholstered seat frames are mostly detachable because they need to be touched before assembling the legs. When the entire chair is lifted, the legs will fall down. In order to prevent falling and shaking, clips need to be installed to clamp them, but the operation is troublesome and affects the overall appearance of the product. Utility Model Content

[0003] The present application aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, the present application provides a folding chair, which enables the folded chair to be self-locking without adding other locking structures, facilitates transportation, and improves the comfort of use.

[0004] According to the folding chair described in the embodiment of the present application, it includes a first folding body, a second folding body and a supporting part. The first folding body and the second folding body are configured to be openably connected by a first connecting component. When the first folding body is flipped to a closed state relative to the second folding body, the first connecting component maintains the first folding body in the closed state relative to the second folding body under the action of its own preload. The supporting part includes a third folding body and a fourth folding body. The third folding body and the fourth folding body are configured to be openably connected to the first folding body by a second connecting component. When the third folding body or the fourth folding body is flipped to a folded state, the second connecting component provides a preload to act on the third folding body or the fourth folding body. In the closed state, the angle between the first folding body and the second folding body is in the range of 0° to 30°. In the folded state, the angle between the third folding body or the fourth folding body and the first folding body is in the range of 0° to 30°.

[0005] According to the folding chair described in the embodiment of the present application, the first connecting component includes a first connecting member and a second connecting member that are rotatably connected, the first connecting member is fixedly connected to the first folding body, the second connecting member is fixedly connected to the second folding body, the first connecting member is provided with a first self-locking structure, and the second connecting member is provided with a second self-locking structure, the first self-locking structure cooperates with the second self-locking structure to enable the first folding body and the second folding body to maintain the closed state.

[0006] According to the folding chair described in the embodiment of the present application, the first self-locking structure includes a first self-locking surface and a first self-locking part, the second self-locking structure includes a second self-locking surface and a second self-locking part, the movement path of the first self-locking part and the movement path of the second self-locking part interfere with each other, part of the first self-locking surface interferes with the movement path of the second self-locking part, and part of the second self-locking surface interferes with the movement path of the first self-locking part, wherein when one side of the second self-locking part rotates to abut against one side of the first self-locking part, the first folding body and the second folding body are in the open state, and when the other side of the second self-locking part rotates to abut against the other side of the first self-locking part, the first folding body and the second folding body are in the closed state, in the closed state, part of the first self-locking surface presses against the second self-locking part, and part of the second self-locking surface presses against the first self-locking part, and in the open state, the angle between the first folding body and the second folding body is greater than or equal to 90°.

[0007] According to the folding chair described in the embodiment of the present application, a side of the first self-locking portion facing the second connecting member is set as a first reference plane, and the first self-locking surface includes a first side and a second side opposite to each other. From the first side to the second side, the vertical distance between the first self-locking surface and the first reference plane gradually decreases, and in the closed state, the second side interferes with the second self-locking portion.

[0008] According to the folding chair described in the embodiment of the present application, a side of the second self-locking portion facing the first connecting member is set as a second reference plane, and the second self-locking surface includes a third side and a fourth side opposite to each other, and from the third side to the fourth side, a vertical distance between the second self-locking surface and the second reference plane gradually decreases, and in the closed state, the fourth side interferes with the first self-locking portion.

[0009] According to the folding chair described in the embodiment of the present application, a first notch is provided on the side of the first connecting member facing the second connecting member to form the first self-locking surface and the first self-locking portion; a second notch is provided on the side of the second connecting member facing the first connecting member to form the second self-locking surface and the second self-locking portion, the second self-locking portion is located in the first notch, and the first self-locking portion is located in the second notch.

[0010] According to the folding chair described in the embodiment of the present application, the extension lines of both sides of the first self-locking part intersect at the rotation center axis of the first connecting member, and the angle formed by the intersection of the extension lines of both sides of the first self-locking part is 180°, and the extension lines of both sides of the second self-locking part intersect at the rotation center axis of the second connecting member, and the angle formed by the intersection of the extension lines of both sides of the second self-locking part is 90°.

[0011] According to the folding chair described in the embodiment of the present application, the second connecting component includes a mounting portion and a limiting portion arranged on the mounting portion, the mounting portion is fixedly connected to the first folding body, the limiting portion made of a reboundable material includes a limiting groove, the third folding body or the fourth folding body is rotatably connected to the limiting groove, and in the folded state, the third folding body or the fourth folding body is flipped to be parallel to the first folding body, and a portion of the third folding body or the fourth folding body is embedded in the limiting groove.

[0012] According to the folding chair described in the embodiment of the present application, the width of the limiting groove gradually decreases from one end to the other end, the third folding body or the fourth folding body is rotatably connected to the end of the limiting groove with a larger width, and during the process of the third folding body or the fourth folding body being flipped to the folded state, the end of the limiting groove with a smaller width is widened.

[0013] According to the folding chair described in the embodiment of the present application, the limiting portion includes a first limiting piece and two symmetrically arranged second limiting pieces, the two second limiting pieces form a groove wall of the limiting groove, the two ends of the first limiting piece are respectively fixed to the ends of the two second limiting pieces, and the first limiting piece is located at the end with a larger width of the limiting groove, and when the third folding body or the fourth folding body is rotated to an expanded state, the third folding body or the fourth folding body resists the first limiting piece.

[0014] The above-mentioned folding chair has at least the following beneficial effects: the above-mentioned first folding body and the second folding body form the main body of the chair through the first connecting component, and due to the existence of the first connecting component, the main body of the chair has a closed state (that is, a folded state) and an open state, and it is also more convenient to switch the main body of the chair between the closed state and the open state. In addition, when the first folding body is flipped to the closed state compared with the second folding body, the first connecting component can provide a certain pre-tightening force to limit the rotation of the first folding body compared with the second folding body, thereby avoiding the first folding body and the second folding body from switching from the folding state to the open state under the action of gravity or other non-artificial external forces during transportation; further, the third folding body and the fourth folding body constitute the chair leg part under the action of the second connecting component, and the chair leg part has a folded state and an open state. When the third folding body or the fourth folding body is flipped to the folded state, the second connecting component provides a pre-tightening force to act on the third folding body or the fourth folding body, thereby avoiding the third folding body or the fourth folding body from switching from the folded state to the open state under the action of gravity or other non-artificial external forces during transportation. The folding chair of the present application enables the chair in the folded state to be self-locking without adding other locking structures, thereby facilitating transportation and improving comfort of use. At the same time, it effectively solves the problem that the folding chair in the portable state is switched from the folded state to the expanded state due to gravity or other non-human external forces during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present application is further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 This is a schematic diagram of the structure of the folding chair in the folded state according to the embodiment of the present application. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the structure of the folding chair in the folded state according to the embodiment of the present application. Figure 2 ;

[0018] Figure 3 is a schematic diagram of the structure when the first folding body and the second folding body are in an open state in an embodiment of the present application;

[0019] Figure 4 is a schematic structural diagram of the third folding body and the fourth folding body in a folded state in an embodiment of the present application;

[0020] Figure 5 is a structural schematic diagram of a folding chair in an embodiment of the present application in an open state;

[0021] Figure 6 is a schematic diagram of the structural change of the folding chair between the folding state and the unfolded state in the embodiment of the present application;

[0022] Figure 7 This is a schematic diagram of the structure when the first connecting component is in an open state in the embodiment of the present application. Figure 1 ;

[0023] Figure 8 This is a schematic diagram of the structure when the first connecting component is in an open state in the embodiment of the present application. Figure 2 ;

[0024] Fig. 9 This is a schematic diagram of the structure of the first connecting component in the closed state in the embodiment of the present application. Figure 1 ;

[0025] Fig.10 This is a schematic diagram of the structure of the first connecting component in the closed state in the embodiment of the present application. Figure 2 ;

[0026] Fig.11 This is a schematic diagram of the structure of the first connecting member in the embodiment of the present application. Figure 1 ;

[0027] Fig.12 This is a schematic diagram of the structure of the first connecting member in the embodiment of the present application. Figure 2 ;

[0028] Fig.13 yes Fig.12 Structural view along the A3 direction;

[0029] Fig.14 yes Fig.12 Structural view along direction A2;

[0030] Fig.15 yes Fig.12 Structural view along the A1 direction;

[0031] Fig.16 This is a schematic diagram of the structure of the second connecting member in the embodiment of the present application. Figure 1 ;

[0032] Fig.17 This is a schematic diagram of the structure of the second connecting member in the embodiment of the present application. Figure 2 ;

[0033] Fig.18 yes Fig.17 Structural view along B4 direction;

[0034] Fig.19 yes Fig.17 Structural view along B2 direction;

[0035] Fig. 20 yes Fig.17 Structural view along B1 direction;

[0036] Fig.21 yes Fig.17 Structural view along B3 direction;

[0037] Fig. 22 This is a schematic diagram of the structure of the second connecting member in the embodiment of the present application. Figure 1 ;

[0038] Fig.23 This is a schematic diagram of the structure of the second connecting member in the embodiment of the present application. Figure 2 ;

[0039] Fig.24 It is the docking portion where the third folding body and the fourth folding body are connected to the limiting portion in the embodiment of the present application. DETAILED DESCRIPTION

[0040] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0041] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 therefore should not be understood as a limitation on the present application.

[0042] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0043] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0044] Reference Figures 1 to 6 The folding chair of the embodiment of the present application includes a first folding body 100, a second folding body 200 and a supporting portion.

[0045] The first foldable body 100 and the second foldable body 200 are configured to be openably connected through the first connecting assembly 500. The openable connection of the present application means that the first foldable body 100 and the second foldable body 200 have an open state and a closed state. Figure 1 and 2 As shown, in the folded state, the angle between the first folding body 100 and the second folding body 200 is in the range of 0° to 30°. Figures 3 to 6 As shown, in the open state, the angle between the first folding body 100 and the second folding body 200 is greater than or equal to 90°. Specifically, the first folding body 100 and the second folding body 200 form the main body of the chair through the first connecting assembly 500, and due to the existence of the first connecting assembly 500, the main body of the chair has a closed state (i.e., a folded state) and an open state, and the main body of the chair is more convenient to switch between the closed state and the open state. When the first folding body 100 is flipped to the closed state relative to the second folding body 200, the first connecting assembly 500 maintains the first folding body 100 in the closed state relative to the second folding body 200 under the action of its own preload, that is, the first connecting assembly 500 can provide a certain preload to limit the rotation of the first folding body 100 relative to the second folding body 200, thereby avoiding the situation in which the first folding body 100 and the second folding body 200 are switched from the folded state to the open state under the action of gravity or other non-artificial external forces during transportation.

[0046] The support portion includes a third folding body 300 and a fourth folding body 400, and the third folding body 300 and the fourth folding body 400 are configured to be openably connected to the first folding body 100 through a second connecting component 600. The third folding body 300 and the fourth folding body 400 constitute the chair leg part under the action of the second connecting component 600, and the chair leg part has a folded state and an open state, such as Figure 1 and Figure 4 As shown, in the folded state, the angle between the third folding body 300 or the fourth folding body 400 and the first folding body 100 is in the range of 0° to 30°. Figure 5 and Figure 6 As shown, in the expanded state, the angle between the third folding body 300 or the fourth folding body 400 and the first folding body 100 is greater than or equal to 90°. When the third folding body 300 or the fourth folding body 400 is flipped to the folded state, the second connecting assembly 600 provides a preload force to act on the third folding body 300 or the fourth folding body 400 to limit the flipping of the third folding body 300 or the fourth folding body 400, thereby avoiding the situation in which the third folding body 300 or the fourth folding body 400 is switched from the folded state to the expanded state under the action of gravity or other non-artificial external forces during transportation.

[0047] The invention effectively solves the problem that the folding chair in a portable state is switched from the folding state to the unfolded state due to the action of gravity or other non-artificial external forces during transportation.

[0048] In the embodiment of the present application, the third folding body 300 and the fourth folding body 400 are respectively disposed at both ends of the second folding body 200 through the second connecting assembly 600, and the third folding body 300 and the fourth folding body 400 are folded toward each other or spread apart from each other under the action of the second connecting assembly 600. Specifically, the third folding body 300 and the fourth folding body 400 are both bent into a U-shaped member using a pipe fitting, and both ends of the U-shaped member are connected to the second folding body through the second connecting assembly 600.

[0049] In some embodiments, the end of the first folding body 100 and the end of the second folding body 200 are connected by a first connecting assembly 500. In the case where the main body of some folding chairs is covered with a soft bag, when the first folding body 100 and the second folding body 200 are in a folded state, space for the soft bag needs to be reserved, such as Figure 1 As shown, in order to enable the folding chair of the present application to adapt to the situation of being covered with a soft bag and also to be able to fold, the first folding body 100 and the second folding body 200 have a storage space 101 for placing the soft bag after being folded. Specifically, the end of the first folding body 100 is bent to have a connecting portion 110, and the end of the first folding body 100 is connected to the connecting portion 110 through a first connecting assembly 500. In the embodiment of the present application, the first folding body 100 and the second folding body 200 can also be made of pipe fittings to reduce the amount of material used, while still having a certain structural strength.

[0050] In some examples, such as Figures 7 to 10As shown, the first connecting component 500 includes a first connecting member 510 and a second connecting member 520 that are rotatably connected. The first connecting member 510 is fixedly connected to the first folding body 100, and the second connecting member 520 is fixedly connected to the second folding body 200. The first connecting member 510 is provided with a first self-locking structure, and the second connecting member 520 is provided with a second self-locking structure. The first self-locking structure cooperates with the second self-locking structure to maintain the first folding body 100 and the second folding body 200 in a closed state. Among them, the first connecting member 510 and the second connecting member 520 share a rotating shaft, and the first connecting member 510 and the second connecting member 520 can be connected by bolt locking or riveting to achieve the purpose of the first connecting member 510 and the second connecting member 520 rotating on a common rotating shaft. At the same time, the axial displacement of the first connecting member 510 and the second connecting member 520 can also be limited to a certain range by bolt locking or riveting, so that when the first connecting member 510 rotates compared to the second connecting member 520, the first self-locking structure and the second self-locking structure cooperate to generate a mutual pre-tightening force to limit the first connecting member 510 from rotating compared to the second connecting member 520, so that the first folding body 100 and the second folding body 200 maintain a closed state.

[0051] In some examples, such as Figures 11 to 21 As shown, the first self-locking structure includes a first self-locking surface 511 and a first self-locking portion 512, and the second self-locking structure includes a second self-locking surface 521 and a second self-locking portion 522; Figures 7 to 10 It is understood that the movement path of the first self-locking portion 512 interferes with the movement path of the second self-locking portion 522, part of the first self-locking surface 511 interferes with the movement path of the second self-locking portion 522, and part of the second self-locking surface 521 interferes with the movement path of the first self-locking portion 512. Figure 7 and Figure 8 As shown, when one side of the second self-locking portion 522 rotates to abut against one side of the first self-locking portion 512, the first folding body 100 and the second folding body 200 are in an open state. Fig. 9 and Fig.10 As shown, when the other side of the second self-locking portion 522 rotates to abut against the other side of the first self-locking portion 512, the first folding body 100 and the second folding body 200 are in a closed state. The cooperation between the second self-locking portion 522 and the first self-locking portion 512 limits the rotation range of the first folding body 100 compared to the second folding body 200.

[0052] In the closed state, part of the first self-locking surface 511 presses against the second self-locking part 522, and part of the second self-locking surface 521 presses against the first self-locking part 512. In the open state, the angle between the first folding body 100 and the second folding body 200 is greater than or equal to 90°. Because the first connecting member 510 and the second connecting member 520 share a rotating shaft, and the axial displacement of the first connecting member 510 and the second connecting member 520 is controllable, when slowly switching from the open state to the closed state, as the second self-locking part 522 slowly rotates, the second self-locking part 522 slowly interferes with part of the first self-locking surface 511, thereby driving the first connecting member 510 and the second connecting member 520 to have a tendency to move away from each other. However, because the axial displacement of the first connecting member 510 and the second connecting member 520 is controllable, as the closed state is completed, the second self-locking part 522 further interferes with the first self-locking surface 511, and the mutual preload force provided by the interference becomes larger and larger, thereby achieving self-locking; Similarly, when slowly switching from the open state to the closed state, as the first self-locking portion 512 slowly rotates, the first self-locking portion 512 slowly interferes with a portion of the second self-locking surface 521, thereby driving the first connecting member 510 and the second connecting member 520 to have a tendency to move away from each other, but because the axial displacement of the first connecting member 510 and the second connecting member 520 is controllable, as the closed state is completed, the first self-locking portion 512 further interferes with the second self-locking surface 521, and the mutual preload force provided by the interference becomes larger and larger, thereby achieving self-locking; in the absence of a large external force, the preload force provided by the interference can keep the first folding body 100 and the second folding body 200 in the closed state.

[0053] It should be noted that, in the open state, the first self-locking surface 511 does not contact the second self-locking portion 522, and the second self-locking surface 521 does not contact the first self-locking portion 512. When switching from the open state to the closed state, the first self-locking surface 511 never contacts the second self-locking portion 522, and slowly becomes a part of the first self-locking surface 511 interfering with the second self-locking portion 522, and the second self-locking surface 521 never contacts the first self-locking portion 512, and slowly becomes the second self-locking surface 521 interfering with the first self-locking portion 512. On the contrary, if it is from the closed state to the open state, it is a process from the interference state to the non-contact state. In this process, the first folding body 100 and the second folding body 200 can be opened smoothly without much effort, and the opening and closing are convenient.

[0054] Further, such as Figures 11 to 15As shown, a side of the first self-locking portion 512 facing the second connecting member 520 is set as a first reference plane, and the first self-locking surface 511 includes a first side 511a and a second side 511b opposite to each other. Specifically, the first side 511a and the second side 511b are symmetrically centered about the rotation center of the first connecting member 510. From the first side 511a to the second side 511b, the vertical distance between the first self-locking surface 511 and the first reference plane gradually decreases. In the closed state, the second side 511b interferes with the second self-locking portion 522. In the embodiment of the present application, the first side 511a and the second side 511b are respectively close to the two sides of the first self-locking portion 512. From the first side 511a to the second side 511b, the vertical distance between the first self-locking surface 511 and the first reference plane gradually decreases, so that the first self-locking surface 511 is an inclined surface compared to the first reference plane. Therefore, when the first connecting member 510 is rotatably connected with the second connecting member 520, the second side 511b is on the movement path of the second self-locking part 522, and the inclined first self-locking surface 511 also facilitates a smoother transition from non-contact to interference with the second self-locking part 522.

[0055] Further, such as Figures 16 to 21 As shown, a side of the second self-locking portion 522 facing the first connecting member 510 is set as a second reference plane, and the second self-locking surface 521 includes a third side 521a and a fourth side 521b opposite to each other. Specifically, the third side 521a and the fourth side 521b are symmetrical with the rotation center of the second connecting member 520. From the third side 521a to the fourth side 521b, the vertical distance between the second self-locking surface 521 and the second reference plane gradually decreases. In the closed state, the fourth side 521b interferes with the first self-locking portion 512. In the embodiment of the present application, from the third side 521a to the fourth side 521b, the vertical distance between the second self-locking surface 521 and the second reference plane gradually decreases, so that the second self-locking surface 521 is an inclined surface compared to the second reference plane. Therefore, when the first connecting member 510 is rotatably connected with the second connecting member 520, the fourth side 521b is on the movement path of the first self-locking portion 512, and the inclined second self-locking surface 521 also facilitates a smoother transition from non-contact to interference with the first self-locking portion 512.

[0056] In the preferred embodiment of the present application, Figures 7 to 21As shown, the first connecting member 510 can be an annular member with a certain thickness facing the second connecting member 520, and a first notch 513 is provided on the side of the first connecting member 510 facing the second connecting member 520 to form a first self-locking surface 511 and a first self-locking portion 512; a second notch 523 is provided on the side of the second connecting member 520 facing the first connecting member 510 to form a second self-locking surface 521 and a second self-locking portion 522, and the second self-locking portion 522 is located in the first notch 513, and the first self-locking portion 512 is located in the second notch 523, so that the rotation range of the first connecting member 510 and the second connecting member 520 can be adjusted, and the processing is also convenient.

[0057] Furthermore, the two side extension lines of the first self-locking part 512 intersect at the rotation center axis of the first connecting member 510, and the angle formed by the intersection of the two side extension lines of the first self-locking part 512 is 180°, and the two side extension lines of the second self-locking part 522 intersect at the rotation center axis of the second connecting member 520, and the angle formed by the intersection of the two side extension lines of the second self-locking part 522 is 90°. That is, under the above definition, the flipping range of the first connecting member 510 is 90° compared with the second connecting member 520.

[0058] In some other embodiments, such as Figure 22 to Figure 23 As shown, the second connecting assembly 600 includes a mounting portion 610 and a limiting portion provided on the mounting portion 610, the mounting portion 610 is fixedly connected to the first folding body 100, specifically, the first folding body 100 may be provided with a connecting member 120 for fixing the mounting portion 610 by bolts or welding, wherein the limiting portion made of a material capable of rebounding includes a limiting groove 621, and the third folding body 300 or the fourth folding body 400 is rotatably connected to the limiting groove 621, and the rotational connection here refers to the third folding body 300 or the fourth folding body 400 being fixed by bolts or The rotating shaft is rotatably connected to the limit groove, and the third folding body 300 or the fourth folding body 400 can be set to be in a state of contact and interference with both sides of the limit groove 621, so that when in the expanded state, under gravity or other non-artificial external forces, the third folding body 300 or the fourth folding body 400 cannot switch to the folded state by itself; the third folding body 300 or the fourth folding body 400 can also be set to a state without interfering with both sides of the limit groove 621. In this state, the third folding body 300 or the fourth folding body 400 can be quickly converted from the expanded state to the folded state.

[0059] In the folded state, the third folding body 300 or the fourth folding body 400 is turned over to be parallel to the first folding body 100, and part of the third folding body 300 or the fourth folding body 400 is embedded in the limiting groove 621. Here, the part of the third folding body 300 or the fourth folding body 400 refers to the part of the third folding body 300 or the fourth folding body 400 close to the limiting groove 621. The length of the part of the third folding body 300 or the fourth folding body 400 embedded in the limiting groove 621 is determined according to the length of the limiting groove 621. The embedding here means that the third folding body 300 or the fourth folding body 400 interferes with the limiting groove 621, that is, the third folding body 300 or the fourth folding body 400 is in an interference fit with the limiting groove 621. Since the main body of the third folding body 300 or the fourth folding body 400 is generally formed into various shapes by bending or assembling strips or columnar parts, there is no situation where the entire third folding body 300 or the fourth folding body 400 is embedded in the limiting groove.

[0060] The process of partially flipping the third folding body 300 or the fourth folding body 400 to be embedded in the limit groove 621 is a process of driving the limit groove 621 to expand and produce elastic deformation. Therefore, when the third folding body 300 or the fourth folding body 400 is partially embedded in the limit groove 621, the limit groove 621 provides a certain pre-tightening force to the part of the third folding body 300 or the fourth folding body 400 embedded in the limit groove 621 under the action of elastic potential energy, thereby preventing the third folding body 300 or the fourth folding body 400 from automatically detaching from the limit groove 621 under the action of a small external force or gravity.

[0061] Further, such as Fig.24 As shown, the third folding body 300 or the fourth folding body 400 is provided with a docking portion 630, and the portion of the third folding body 300 or the fourth folding body 400 embedded in the limiting groove 621 can be longer than the length of the docking portion 630, and the docking portion 630 has two symmetrical planes. The docking portion 630 is detachably connected to the limiting groove 621 by bolts, and the planes are in contact with the limiting groove 621. The distance between the two planes of the docking portion 630 can be greater than the width of the limiting groove 621, which is convenient for increasing the contact area between the docking portion 630 and the limiting groove 621 in the folded state, thereby increasing the static friction between the docking portion 630 and the limiting groove 621, and preventing the third folding body 300 or the fourth folding body 400 from automatically detaching from the limiting groove 621 under the action of a small external force or gravity.

[0062] Further, the width of the limiting groove 621 from one end to the other end gradually decreases, and the third folding body 300 or the fourth folding body 400 is rotatably connected to the end with the larger width of the limiting groove 621. When the third folding body 300 or the fourth folding body 400 is turned over to the folded state, the end with the smaller width of the limiting groove 621 is widened. Among them, the width of the two planes of the docking portion 630 should be greater than the minimum width of the limiting groove 621, so that when the third folding body 300 or the fourth folding body 400 is turned over to be parallel to the first folding body 100, the docking portion 630 expands the end with the smaller width of the limiting groove 621, so that part of the third folding body 300 or the fourth folding body 400 is embedded in the limiting groove 621. Since the limiting portion is made of a resilient material, the process of the limiting groove 621 being expanded is the process of generating elastic potential energy, that is, it can provide pre-pressure to act on the docking portion 630, so that the third folding body 300 or the fourth folding body 400 is maintained in the folded state. Furthermore, when the third folding body 300 or the fourth folding body 400 is converted from the folded state to the expanded state, it is a process of potential energy release. Therefore, the expansion of the third folding body 300 or the fourth folding body 400 is also faster.

[0063] Furthermore, the limiting portion includes a first limiting member 623 and two symmetrically arranged second limiting members 622, the two second limiting members 622 form a groove wall of the limiting groove 621, the two ends of the first limiting member 623 are respectively fixed to the ends of the two second limiting members 622, and the first limiting member 623 is located at the end with a larger width of the limiting groove 621. When the third folding body 300 or the fourth folding body 400 is rotated to the expanded state, the third folding body 300 or the fourth folding body 400 abuts against the first limiting member 623. The setting of the first limiting member 623 limits the expansion angle of the third folding body 300 or the fourth folding body 400. In the embodiment of the present application, in the expanded state, the angle between the third folding body 300 or the fourth folding body 400 and the first folding body 100 is greater than or equal to 90° and not more than 180°. In addition, the limiting portion of the present application can be made of steel, and the second limiting member 622 and the first limiting member 623 can be plate-like members, so that under the extrusion of external force, the two second limiting members 622 can be stretched apart, and after the external force disappears, the two second limiting members 622 can be restored to provide a pre-tightening force to act on the third folding body 300 or the fourth folding body 400 embedded in the limiting groove 621.

[0064] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A folding chair, characterized in that: The invention comprises a first folding body (100), a second folding body (200) and a supporting portion, wherein the first folding body (100) and the second folding body (200) are configured to be openably connected via a first connecting component (500), and when the first folding body (100) is flipped relative to the second folding body (200) to a closed state, the first connecting component (500) maintains the first folding body (100) relative to the second folding body (200) in the closed state under the action of its own pre-tightening force, and the supporting portion comprises a third folding body (300) and a fourth folding body (400), wherein the third folding body (300) and the fourth folding body (400) are The second connecting component (600) is configured to be openably connected to the first folding body (100), and when the third folding body (300) or the fourth folding body (400) is flipped to a folded state, the second connecting component (600) provides a pre-tightening force to act on the third folding body (300) or the fourth folding body (400), wherein, in the closed state, the angle between the first folding body (100) and the second folding body (200) ranges from 0° to 30°, and in the folded state, the angle between the third folding body (300) or the fourth folding body (400) and the first folding body (100) ranges from 0° to 30°.

2. The folding chair according to claim 1, characterized in that: The first connecting component (500) includes a first connecting member (510) and a second connecting member (520) that are rotatably connected, the first connecting member (510) is fixedly connected to the first folding body (100), and the second connecting member (520) is fixedly connected to the second folding body (200), the first connecting member (510) is provided with a first self-locking structure, and the second connecting member (520) is provided with a second self-locking structure, and the first self-locking structure cooperates with the second self-locking structure to enable the first folding body (100) and the second folding body (200) to maintain the closed state.

3. The folding chair according to claim 2, characterized in that: The first self-locking structure includes a first self-locking surface (511) and a first self-locking portion (512), and the second self-locking structure includes a second self-locking surface (521) and a second self-locking portion (522). The movement path of the first self-locking portion (512) and the movement path of the second self-locking portion (522) interfere with each other. A portion of the first self-locking surface (511) interferes with the movement path of the second self-locking portion (522), and a portion of the second self-locking surface (521) interferes with the movement path of the first self-locking portion (512). When one side of the second self-locking portion (522) rotates to abut against one side of the first self-locking portion (512), the The first folding body (100) and the second folding body (200) are in the open state, and when the other side of the second self-locking portion (522) rotates to abut against the other side of the first self-locking portion (512), the first folding body (100) and the second folding body (200) are in the closed state. In the closed state, part of the first self-locking surface (511) presses against the second self-locking portion (522), and part of the second self-locking surface (521) presses against the first self-locking portion (512). In the open state, the angle between the first folding body (100) and the second folding body (200) is greater than or equal to 90°.

4. The folding chair according to claim 3, characterized in that: The side of the first self-locking portion (512) facing the second connecting member (520) is set as a first reference plane, and the first self-locking surface (511) includes a first side (511a) and a second side (511b) opposite to each other. From the first side (511a) to the second side (511b), the vertical distance between the first self-locking surface (511) and the first reference plane gradually decreases. In the closed state, the second side (511b) interferes with the second self-locking portion (522).

5. The folding chair according to claim 3, characterized in that: The side of the second self-locking portion (522) facing the first connecting member (510) is set as a second reference plane, and the second self-locking surface (521) includes a third side (521a) and a fourth side (521b) opposite to each other. From the third side (521a) to the fourth side (521b), the vertical distance between the second self-locking surface (521) and the second reference plane gradually decreases. In the closed state, the fourth side (521b) interferes with the first self-locking portion (512).

6. The folding chair according to any one of claims 3 to 5, characterized in that: A first notch (513) is provided on a side of the first connecting member (510) facing the second connecting member (520) to form the first self-locking surface (511) and the first self-locking portion (512); a second notch (523) is provided on a side of the second connecting member (520) facing the first connecting member (510) to form the second self-locking surface (521) and the second self-locking portion (522), the second self-locking portion (522) being located in the first notch (513), and the first self-locking portion (512) being located in the second notch (523).

7. The folding chair according to claim 6, characterized in that: The extension lines on both sides of the first self-locking part (512) intersect at the rotation center axis of the first connecting member (510), and the angle formed by the intersection of the extension lines on both sides of the first self-locking part (512) is 180°. The extension lines on both sides of the second self-locking part (522) intersect at the rotation center axis of the second connecting member (520), and the angle formed by the intersection of the extension lines on both sides of the second self-locking part (522) is 90°.

8. The folding chair according to claim 1, characterized in that: The second connecting assembly (600) includes a mounting portion (610) and a limiting portion provided on the mounting portion (610), wherein the mounting portion (610) is fixedly connected to the first folding body (100), and the limiting portion made of a material capable of rebounding includes a limiting groove (621), and the third folding body (300) or the fourth folding body (400) is rotatably connected to the limiting groove (621). In the folded state, the third folding body (300) or the fourth folding body (400) is flipped to be parallel to the first folding body (100), and a portion of the third folding body (300) or the fourth folding body (400) is embedded in the limiting groove (621).

9. The folding chair according to claim 8, characterized in that: The width of the limiting groove (621) gradually decreases from one end to the other end, the third folding body (300) or the fourth folding body (400) is rotatably connected to the end of the limiting groove (621) with a larger width, and when the third folding body (300) or the fourth folding body (400) is turned over to the folded state, the end of the limiting groove (621) with a smaller width is widened.

10. The folding chair according to claim 9, characterized in that: The limiting portion includes a first limiting member (623) and two symmetrically arranged second limiting members (622), the two second limiting members (622) forming the groove wall of the limiting groove (621), the two ends of the first limiting member (623) being respectively fixed to the ends of the two second limiting members (622), and the first limiting member (623) being located at the end of the limiting groove (621) having a larger width, and when the third folding body (300) or the fourth folding body (400) is rotated and stretched, the third folding body (300) or the fourth folding body (400) abuts against the first limiting member (623).

Images