CN217218523U

CN217218523U - Joint connector, chair frame and portable folding chair

Info

Publication number: CN217218523U
Application number: CN202122993317.8U
Authority: CN
Inventors: 水田農潮
Original assignee: Shanghai Lianyou Lijia Trading Co ltd
Current assignee: Shanghai Lianyou Lijia Trading Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-08-19
Anticipated expiration: 2031-11-30

Abstract

The utility model provides a joint connecting piece, chair frame and portable folding chair. The portable folding chair comprises a chair frame and chair cloth, wherein the chair frame is formed by connecting joint connecting pieces, each joint connecting piece comprises two connecting pipe fittings which are rotationally symmetrically arranged, and a third connecting pipe fitting is arranged along a rotating shaft of the two connecting pipe fittings, and the three connecting pipe fittings are provided with a connector A, a connector B and a connector C for inserting external rod pieces; the joint connecting piece is integrally arranged in an X shape, and the first connecting pipe fitting, the second connecting pipe fitting and the third connecting pipe fitting are integrally formed. The joint connecting pieces adopted by the utility model are arranged in a rotational symmetry manner, so that the comparison part between the rod piece and the interface is reduced when the rod piece is inserted, and time and labor are saved; the integral forming of the joint connecting piece increases the structural strength of the joint connecting piece. The chair frame and the portable folding chair adopt the joint connecting piece, and have the advantages of time and labor saving in assembling and storing, high production efficiency, more stable structure, smaller size, portability and the like.

Description

Joint connecting piece, chair frame and portable folding chair

Technical Field

The application relates to the field of folding chairs, in particular to a joint connecting piece, a chair frame and a portable folding chair.

Background

In life, people often use a chair, which is daily life furniture and particularly needs to carry a portable and foldable chair to rest at any time and any place during activities such as camping, fishing or picnic.

In the related art, a folding chair mainly includes a chair frame and a chair seat. The chair frame consists of a plurality of supporting rods and joint connecting pieces. The common joint connecting piece is provided with a plurality of interfaces for inserting the rod pieces, and the rod pieces are inserted into the interfaces to form a chair frame with bearing capacity when in use; the chair cloth is sleeved on the rod piece of the chair frame to form a chair surface suitable for sitting.

When the folding chair is used, the chair frame needs to be assembled firstly; when assembling the chair frame, the rods need to be inserted into different interfaces of the joint connecting piece in different categories; when the chair frame is folded, the rod piece and the joint connecting piece are separated and stored. The inventor finds in practice that when people use the folding chair, the interfaces of the joint connecting pieces and the installation positions of the rod pieces need to be compared in advance, and then the rod pieces are inserted into the corresponding joint connecting pieces one by one to form a chair frame with bearing capacity; when the use is finished, the rod pieces and the joint connecting pieces need to be separated one by one and the rod pieces are collected; the assembling and storing process of the rod is complicated, time-consuming and labor-consuming.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems that assembly is troublesome and time and labor are wasted when people use folding chairs in daily life, the joint connecting piece is provided, and the joint connecting piece can play a role in reducing the time of inserting a rod piece into a joint through the rotationally symmetrical arrangement of connecting pipe fittings; based on the joint connecting piece, the application also provides a chair frame, which realizes the effects of saving time and labor when a user assembles and stores the chair frame; based on above-mentioned chair frame, this application has still provided one kind and a portable folding chair, and its installation is convenient and use comfort is high.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

a joint connecting piece comprises a first connecting pipe fitting and a second connecting pipe fitting which are arranged in a bending mode, wherein the first connecting pipe fitting and the second connecting pipe fitting are arranged in a rotational symmetry mode and fixedly connected with each other, and the whole joint connecting piece is in an X shape; the joint connecting piece also comprises a third connecting pipe fitting, and the third connecting pipe fitting is fixedly connected with one side of the first connecting pipe fitting and/or one side of the second connecting pipe fitting; the two end faces of the first connecting pipe fitting and the second connecting pipe fitting are respectively provided with a connector A and a connector B for the insertion of an external connecting rod, and at least one end face of the two end faces of the third connecting pipe fitting is provided with a connector C for the insertion of an external rod piece.

Through adopting above-mentioned technical scheme, first connection pipe fitting, second connection pipe fitting and third connection pipe fitting provide the interface that supplies outside member to peg graft, and three fixed connection, the joint connecting piece is whole to be rotational symmetry and sets up, such setting up when making outside member peg graft the interface on the joint connecting piece, no matter what turned angle the joint connecting piece is in, the user all need not to compare one by one interface and member and pairs, make things convenient for the equipment of joint connecting piece and outside connecting rod, labour saving and time saving.

Preferably, the third is connected the pipe fitting and is connected the axial setting of the rotational symmetry axle of pipe fitting along first connecting tube spare and second, and is connected the equal fixed connection of pipe fitting with first connecting tube spare and second.

Through above-mentioned technical scheme, the third is connected the pipe fitting and is connected the axial setting of the rotational symmetry axle of pipe fitting along first connecting pipe fitting and second, and the setting of third connection pipe fitting provides the interface that the pipe fitting is connected to first connecting pipe fitting of perpendicular to and second for joint connection spare, and the connection between a plurality of joint connection spare of being convenient for increases joint connection spare's usability when the member is pegged graft through joint connection spare more convenient.

Preferably, first connecting pipe fitting and second connecting pipe fitting all are the setting of L shape, form the connection space that supplies the third connecting pipe fitting to wear to establish between the corner of the two.

Through above-mentioned technical scheme, can realize the X-shaped setting of joint connection spare for the joint connection spare equipment is more simple and convenient, and such structure has higher stability.

Preferably, the interface A, the interface B and the interface C are respectively formed by slotting along the axial direction of the first connecting pipe fitting, the second connecting pipe fitting and the third connecting pipe fitting; the side walls of the first connecting pipe fitting and the second connecting pipe fitting, which are close to the connector A and the connector B, are respectively provided with an accommodating groove or a fixed connection accommodating pipe, and the openings of the accommodating grooves or the accommodating pipes are arranged towards the same side of the joint connecting piece.

Through above-mentioned technical scheme for the joint connecting piece is the equipment and accomodates integration setting, and the opening direction of accomodating the pipe or accomodating the groove is the same with the third connection pipe fitting axial, and such setting up makes the member peg graft in joint connecting piece accomodate the pipe or accomodate the groove when putting in order, and the assembly that forms is more regular, reduces the equipment simultaneously and puts in order the time of member, improves the efficiency of equipment support.

Preferably, the first connecting pipe fitting and the second connecting pipe fitting are provided with fastening strips protruding along the axial direction on the inner side walls close to the ports a and B for guiding the external connecting rod to be inserted into the ports.

Through above-mentioned technical scheme, when setting up of fastening strip makes the member peg graft in the interface of joint connection spare, utilize the above-mentioned fastening strip that has the guide effect, can guide the user with the quick accurate interface of inserting of outside connecting rod, shorten the time of equipment. Meanwhile, the fastening strips on the inner side wall of the interface are abutted to the outer side wall of the rod piece, so that the rod piece is more firmly spliced, and the stability of the assembled support structure is higher.

Preferably, the first connecting pipe fitting, the second connecting pipe fitting and the third connecting pipe fitting are integrally formed.

Through the technical scheme, the knuckle connecting piece can be integrally injection-molded during production and manufacturing, the production time cost is reduced, and the structural stability of the knuckle connecting piece is higher due to the arrangement of the integral molding.

Preferably, a reinforcing rib plate is integrally formed among the first connecting pipe fitting, the second connecting pipe fitting and the third connecting pipe fitting.

Through above-mentioned technical scheme, the setting up of reinforcing floor makes the structural stability of first connecting tube spare and second connecting tube spare higher, and can disperse the member and apply for connecting the axial pressure of pipe fitting edge connecting tube spare for joint connecting piece's life increases.

The utility model also provides a chair frame, the chair frame includes above-mentioned joint connecting piece, and two joint connecting pieces are symmetry setting in opposite directions. Further comprising:

the connecting rod structure comprises a cross rod which is used for being inserted between the interfaces C of the two joint connecting pieces;

the underframe structure comprises 4 supporting legs which are used for being in inserting fit with an interface A of a first connecting pipe fitting in the two joint connecting pieces;

the supporting structure comprises 4 supporting rods and is used for being matched with an interface B of a second connecting pipe fitting in the two joint connecting pieces in an inserting manner;

when the chair frame is in an unfolded state, 4 supporting legs are respectively inserted into the interface A, 4 supporting rods are respectively inserted into the interface B, and the cross rod is inserted between the interfaces C of the two joint connecting pieces;

when the chair frame is in a folded state, the supporting legs and the supporting rods are separated from the interface A and the interface B and are respectively inserted into the containing grooves or the containing pipes on the joint connecting pieces.

Through above-mentioned technical scheme, through joint connection's connection, the advantage that joint connection possesses appears in above-mentioned chair frame:

two ends of the cross rod are connected with two oppositely arranged joint connecting pieces, and the joint connecting pieces provide interfaces for inserting external rod pieces; the rod piece is inserted into the X-shaped bracket of the joint connecting piece to form a framework with bearing capacity and higher stability; the arrangement of the accommodating groove or the accommodating pipe enables the supporting legs and the supporting rods to be inserted into the joint connecting piece, the assembling and the accommodating can be realized by changing the supporting legs and the supporting rods, and the efficiency of assembling or accommodating the chair frame is greatly improved.

Preferably, the first connecting pipe fitting and the second connecting pipe fitting are obliquely arranged at an angle of 10-15 degrees with respect to a plane where rotating shafts of the first connecting pipe fitting and the second connecting pipe fitting are located.

Through above-mentioned technical scheme for landing leg and bracing piece are pegged graft when articular connection spare, and the two is radial setting towards the direction of keeping away from articular connection spare, and such setting up makes chassis structure and bearing structure's focus reduce, and the holistic stability of chair frame promotes greatly.

Preferably, a flexible connecting rope is arranged between the support leg and the support rod and between the first connecting pipe fitting and the second connecting pipe fitting.

Through the technical scheme, the landing leg and the bracing piece are connected with the joint connecting piece through the flexible connection rope, the landing leg and the bracing piece can be inserted into the corresponding interface through the connection rope when the chair frame is assembled, the time that a user assembles the chair frame to be spent is reduced, the connection rope is simultaneously connected with the joint connecting piece and the rod piece, and the probability that the rod piece is lost can be reduced.

Preferably, the first connecting pipe fitting and the second connecting pipe fitting are respectively provided with a first wire passing hole and a second wire passing hole for the flexible connecting rope to pass through; the flexible connecting rope in the first connecting pipe fitting penetrates through the first wire passing hole to connect the two support legs inserted into the connector A; and the flexible connecting rope in the second connecting pipe fitting penetrates through the second wire passing hole to connect the two support rods inserted into the interface B.

Through above-mentioned technical scheme, utilize and connect the rope and can let the user correspond landing leg and bracing piece and peg graft in the interface in the short time, reduce the step of comparing member and interface, promote chair frame packaging efficiency.

Preferably, the support rods comprise two seat surface support rods and two chair back support rods; the back of the chair bracing piece divide into folding first support section and second support section, and after first support section and second support section were folded, the length of back of the chair bracing piece equaled the seat face bracing piece.

Through above-mentioned technical scheme, back of the chair bracing piece is collapsible setting, and such setting makes the back of the chair bracing piece fold back and puts the assembly that forms more regular and the volume is littleer, and convenient to use person carries the chair frame.

The utility model also provides a portable folding chair, which comprises a chair surface and the chair frame; the chair surface comprises chair cloth and 4 corner bags arranged on the chair cloth;

when the portable folding chair is in an unfolded state, the chair frame is in an unfolded state, the corner bags are sleeved at the seat surface supporting rods of the chair frame and one end of the chair back supporting rod far away from the joint connecting piece, and the chair cloth is spread on the chair frame to form a seat surface suitable for sitting;

when the portable folding chair is in a folding state, the chair frame is in a folding state, the corner bags are separated from the seat surface supporting rods and the chair back supporting rods, and the chair cloth is separated from the chair frame.

Through above-mentioned technical scheme, above-mentioned portable folding chair possesses: when the user uses the portable folding chair, the assembly is convenient, and the time and the labor are saved; the portable folding chair is smaller in size and convenient to carry after being stored by a user; the chair frame structure is more stable when the user leans on the portable folding chair, and the seat is laminated the health structure settings such as user's back and buttock, and the comfort level is higher.

In summary, the present application includes at least one of the following beneficial technical effects:

the rotational symmetry of the joint connecting pieces enables the same support to be formed no matter how the pipe fittings are inserted, so that the time consumed for assembling the support through the joint connecting pieces is reduced, and the time and the labor are saved;

the joint connecting piece used by the chair frame integrates the assembling interface and the containing interface, so that the chair frame is convenient to assemble;

3. because the joint connecting piece is integrated into one piece setting, the joint connecting piece is higher in production machining efficiency, and joint connecting piece's structural strength is high, and the supporting structure through joint connecting piece formation is more stable.

Drawings

Fig. 1 is a front view of a joint connector according to an embodiment of the present invention.

Fig. 2 is a side view of an articulating component according to an embodiment of the invention.

Fig. 3 is a front view of the joint connecting member according to the embodiment of the present invention.

Fig. 4 is a schematic structural view of a chair frame according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a top plug according to an embodiment of the present invention.

Fig. 6 is a schematic structural view of a double-chair frame according to an embodiment of the present invention.

Fig. 7 is a schematic structural view of the portable folding chair according to the embodiment of the present invention.

Description of the reference numerals: 1. a joint connector; 11. a first connecting pipe fitting; 12. a second connecting pipe fitting; 13. a third connecting pipe fitting; 14. a storage tube or a storage groove; 15. fastening strips; 16. a reinforcing rib plate; 2. a connecting rod structure; 21. a cross bar; 3. a chassis structure; 31. a support leg; 32. a leg supporting sleeve; 4. a support structure; 41. seat surface support rods; 42. a chair back support bar; 43. buckling; 44. a top plug; 5. a chair surface; 51. a chair cloth; 52. corner bags; 6. a flexible connecting rope; 61. a first elastic cord; 62. a second elastic cord.

Detailed Description

The embodiments of the present invention will be more clearly and completely described with reference to the accompanying drawings 1-7.

The joint connecting piece 1 is mainly used for occasions that people need to build a support such as assembling chair frames, building tents and assembling folding wardrobes. Referring to fig. 1 and 2, the joint connector 1 is provided in an X-shape as a whole.

Detailed, joint connection spare 1 is including the first connecting tube spare 11 that is the setting of L font, be rotational symmetry with first connecting tube spare 11 and set up and with first connecting tube spare 11 integrated into one piece's second connecting tube spare 12 for first connecting tube spare 11 and second connecting tube spare need not pay attention to when using positive and negative, improve the efficiency of member grafting installation. The first connecting pipe fitting 11 of perpendicular to and the second connecting pipe fitting still are equipped with third connecting pipe fitting 13, and first connecting pipe fitting 11 and the second connecting pipe fitting junction are equipped with the connecting space that the cross-section was similar to the rhombus and sets up, and 13 one end of third connecting pipe fitting are pegged graft in above-mentioned connecting space.

In this embodiment, as shown in fig. 1 and fig. 2, the third connecting pipe 13 is opened on a single side to form a joint C, one end of the third connecting pipe 13 far from the joint C is inserted into the connecting space, and one end of the third connecting pipe 13 far from the joint C is closed. When the rod piece is inserted into the connector C, one end of the rod piece is abutted against the inner side wall of the third connecting pipe fitting 13, and the rod piece is axially arranged along the third connecting pipe fitting 13. According to the difference of the use scene, can establish the third and connect the pipe fitting 13 and all be equipped with the opening so that realize the member and run through the needs of pegging graft in the third and connect the pipe fitting 13 for two terminal surfaces.

As shown in fig. 1, the bending portions of the first connecting tube 11 and the second connecting tube are integrally formed with a reinforcing rib 16 to increase the structural strength of the first connecting tube 11 and the second connecting tube.

In order to further promote the efficiency and the structural strength of the production and processing of above-mentioned articular connection spare, the articular connection spare in this embodiment is integrative injection moulding.

The radial cross section of the reinforcing rib 16 in this embodiment is approximately fan-shaped, and may be triangular or trapezoidal according to actual requirements.

Referring to fig. 1, the plane of the first connecting pipe 11 and the plane of the second connecting pipe 12 are inclined, and the inclination angle between the first connecting pipe and the second connecting pipe can be set to meet different connection requirements according to different use scenes.

In this embodiment, since the joint connector 1 is used to connect the chair frame, preferably, the first connecting tube 11 is inclined at an angle of 10 ° to 30 ° and is disposed on the plane where the second connecting tube 12 is located, when the rod is inserted into the first connecting tube 11 and the second connecting tube 12, the rod is disposed radially along the axial direction of the connecting tubes in a direction away from the joint connector, so as to achieve the purpose of lowering the center of gravity of the chair frame and increase the structural stability of the chair frame.

In other embodiments, the tilt angle may be adjusted according to the actual requirements of the bracket.

Referring to fig. 1 and 2, the first connecting pipe 11 and the second connecting pipe 12 are respectively provided with a joint a and a joint B along the axial direction of the two arms; the third connecting pipe fitting 13 is provided with a joint C along the axial direction thereof; the interface A, the interface B and the interface C are all used for external rod piece insertion.

In this embodiment, the interface a, the interface B, and the interface C are all arranged in a shape with a radial cross section similar to a rectangle, and according to the requirement of the insertion rod member, the three interfaces can be arranged in a symmetrical pattern with a radial cross section similar to an equilateral triangle, a circle, a hexagon, or the like, so that the direction comparison step is omitted when the rod member is inserted, and the insertion efficiency of the rod member is improved.

Referring to fig. 1 and 2, the inner side walls of the interface a, the interface B and the interface C are provided with a plurality of fastening strips 15. Due to the guiding arrangement of the fastening strips, the time and labor are saved when the external rod piece is inserted into the interface A, the interface B or the interface C; meanwhile, the fastening strips 15 are abutted to the outer side wall of the rod piece, so that the stability between the rod piece and the interface is improved.

In this embodiment, the fastening strip 15 is trapezoidal along its axial cross section, and can also be set to have an inclination angle such as a triangle or a fillet on the axial cross section, so that the rod member can be inserted and connected more easily.

Referring to fig. 1 and 3, the receiving members are disposed on the same sides of the interface a and the interface B and the joint connection member 1, the receiving members may be configured as a receiving tube 141 or a receiving groove 142, and the opening direction of the receiving groove 142 or the receiving tube 141 is the same as that of the third connection tube 13, so as to insert an external rod and keep the axial direction of the external rod and the axial direction of the third connection tube 13 parallel, thereby facilitating the receiving.

In this embodiment, the receiving tubes 141 are preferably disposed on the same sides of the joints a and B and the joint connector 1, the receiving tubes 141 are disposed with radial cross sections similar to a rectangle, and the rod members adapted to different radial cross sections can be disposed in shapes corresponding to the radial cross sections, so that the rod members are not compared with the rod members to reduce the time for assembling the rod members.

Referring to fig. 1, the outer side wall surfaces of the first connecting pipe 11 and the second connecting pipe are provided with arrows along the axial directions of the two arms, the arrows point to the reinforcing rib plates 16, and the bottoms of the arrows are provided with numbers for guiding a user, so as to guide the plugging direction of the rod member, and improve the assembling efficiency of the pipes.

Referring to fig. 4, the chair frame includes two joint connectors 1 symmetrically arranged in opposite directions, referring to fig. 4, the chair frame further includes a connecting rod structure 2, a bottom frame structure 3 and a supporting structure 4. The link structure 2 comprises a cross bar 21; the undercarriage structure 3 comprises for 4 legs 31; the support structure 4 includes 4 support rods, which are divided into a seat support rod 41 for supporting a seat surface and a back support rod 42 for supporting a back of a chair.

Referring to fig. 1, the end surfaces of the first connecting pipe 11 and the second connecting pipe 12 close to the reinforcing rib 16 are both provided with a wire passing hole for passing through an external rope. The fillet breach that is used for the outside rope body of transition is offered with the shared lateral wall of accomodating pipe 141 to interface A and interface B, accomodates the breach that L font was all offered to the lateral wall of pipe 141 and interface A, interface B parallel and level, and both all are used for the wire-wrapping of the outside rope body to connect in order to reduce outside rope body direct exposure in the joint connecting piece outside, increase the life of the rope body.

In the connecting rod structure of this embodiment, two ends of the cross rod 21 are inserted into the third connecting pipe 13 of the two symmetrically arranged joint connecting members 1, so as to form an i-shaped arrangement. On one hand, the connecting rod structure 2 provides an interface A, an interface B and an interface C for inserting connection for the chassis structure 3 and the supporting structure 4; on the other hand, in the actual use process, the connecting rod structure 2 can form a support parallel to the contacted ground for the chair frame, so that the stability of the chair frame structure is higher.

In an actual use scene, a plurality of joint connectors 1 can be inserted into the cross rod 21 according to use requirements to form a required bracket. As shown in fig. 5, four articulated connecting pieces are inserted into the same cross bar to form two chair frames which are arranged side by side.

When the chair frame is in an unfolded state, as shown in fig. 4, the four legs 31 are respectively inserted into the upper joints a of the first connecting pipes 11 of the two joint connectors 1, so as to form an underframe structure which is in contact with the ground and has a bearing capacity.

Because the first connecting pipe fitting 11 is arranged obliquely, as shown in fig. 3, the four supporting legs 31 are radially arranged, and the radial cross sections of the supporting legs 31 are gradually increased towards the end, away from the joint connecting piece 1, of the supporting legs 31, the center of gravity of the underframe structure is reduced, and the stability of the underframe structure is improved.

The supporting leg 31 is internally provided with a cavity, and the end surface close to the interface is provided with a supporting leg hole. As shown in fig. 4, a first elastic rope 61 is connected through the leg 31 inserted into the first connecting pipe 11; the first elastic rope 61 is threaded through the wire passing hole of the first connecting pipe 11, and two ends of the first elastic rope are respectively and fixedly connected to the leg holes in the legs 31, so that the legs 31 can be stretched and inserted into the first connecting pipe 11. The leg 31 is more firmly inserted into the interface a by the tension of the first elastic rope 61, and the leg 31 is also firmly inserted into the interface a.

The supporting legs 31 in this embodiment are arranged in a radial cross section similar to a rectangle, and can also be arranged in a practical use scene as a symmetrical figure similar to an equilateral triangle, a circle or a hexagon; the number of legs 31 may also be determined according to the actual number of frames to be formed.

The end of the leg 31 remote from the joint connector 1 is sleeved with a leg sleeve 32. Referring to fig. 4, the supporting leg 31 is in a prism shape with an opening on one side, a plurality of dents convenient for taking off the supporting leg 31 are arranged on the outer side wall of the supporting leg sleeve 32 in a circumferential array, one end of the supporting leg 31, far away from the supporting leg 31, is arranged in an approximate dome shape, and a plurality of convex blocks are arranged on the edge of the dome in a circumferential array; the domes and bumps form micro-mounts to allow the legs 31 to be more stably attached to the ground.

In this embodiment, the supporting structure is provided with four supporting rods with cavities therein and openings on two sides, and referring to fig. 4, the supporting rods are respectively inserted into the joints B of the second connecting pipe 12 of the joint connecting member 1. The support rods are divided into a seat support rod 41 for supporting a seat and a backrest support rod 42 for supporting the backrest, and the seat support rod 41 is shorter than the backrest support rod 42.

In this embodiment, the backrest support bar 42 is divided into a first section and a second section, and the first section and the second section are connected by a second elastic cord 62 in a stretchable manner. The length of the chair back support rod 42 is twice that of the seat surface support rod 41, so that the chair back can be conveniently folded and stored, and the chair back can be longer, and can be more fit with the back and hip structures of a human body.

Referring to fig. 4, a buckle 43 is fixedly connected to the middle of the seat back support rod 42, and the buckle 43 includes a first portion with a closed side wall and a second portion with an opening on the side wall. When the chair back support rod 42 is in the unfolding state, the first section and the second section are in the same horizontal line; when the backrest support rod 42 is folded, the second section is folded and fastened to the second portion of the buckle. The length of the folded chair back support rod 42 is similar to that of the seat surface support rod 41, so that the chair frame is more regular when being stored, and is convenient for a user to carry.

The ends of the seat surface support bar 41 and the back support bar 42 far away from the joint connector 1 are respectively clamped with a top plug 44. Referring to fig. 5, the top plug 44 is arranged in a T shape, and has a cavity therein, an opening on a side wall thereof, and a top plug hole on a bottom thereof, forming a semi-closed cavity for clamping the second elastic cord 62. The inner cavities of the seat surface support rod 41 and the chair back support rod 42 are connected with a second elastic rope 62 in a penetrating way; the second elastic rope 62 is simultaneously connected with the wire passing hole on the bottom end surface of the second connecting pipe fitting 12 in a penetrating way; two ends of the second elastic cord 62 are respectively clamped to the seat surface support bar 41 and the top plug 44 of the chair back support bar 42; the seat support bar 41 and the backrest support bar 42 are connected to the second connecting tube 12 in a stretchable manner.

In this embodiment, when the chair frame is in the folded state, the leg 31 is separated from the interface a and is inserted into the receiving tube 141; the seat support rod 41 and the seat back support rod 42 are separated from the interface B and are inserted into the receiving tube 141. Since the opening direction of the receiving tube 141 is the same as the axial direction of the third connecting tube 13, the supporting legs 31 and the supporting rods 41 are both parallel to the cross bar 21, so as to form a regular combination, and the volume is smaller for carrying.

At this time, the first elastic string 61 and the second elastic string 62 are respectively wound around the notches of the first connecting tube 11 and the second connecting tube 12, and are received in the inner sidewall of the receiving tube 141 along with the supporting leg 31 and the supporting rod 41. Due to the arrangement, the first elastic rope 61 and the second elastic rope 62 are prevented from being exposed outside the joint connecting piece 1, the external friction of the elastic ropes is reduced, and the service life of the elastic ropes is prolonged.

The portable folding chair in this embodiment includes above-mentioned chair frame and seat. Referring to fig. 7, the seat 5 includes a seat cloth 51 and corner pockets 52 sewn to corners of the surface of the seat for fitting with the support rods 41. When in use, the chair frame is unfolded, the corner bag 52 is sleeved at one end of the supporting rod 41 far away from the joint connecting piece 1, and a chair surface 5 suitable for leaning is formed.

In this embodiment, as shown in fig. 7, the chair cloth 51 is preferably arranged to be longer, so that the chair cloth naturally hangs down to form a recess suitable for the user to sit on after the portable folding chair is assembled, the recess is adapted to the hip of the human body, and the chair back is adapted to the back of the user, thereby increasing the comfort level of using the folding chair.

The corner pockets 52 are provided in a triangular shape in this embodiment. As shown in FIG. 7, the corner of the corner pocket 52 is overlapped with the corner of the chair cloth 51, and the area of the opening cross section of the corner pocket 52 is larger than the radial cross section of the support rod 41, so that the support rod 41 can be conveniently inserted and connected.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. The joint connecting piece is characterized in that the joint connecting piece (1) comprises a first connecting pipe fitting (11) and a second connecting pipe fitting (12) which are arranged in a bending mode, the first connecting pipe fitting (11) and the second connecting pipe fitting (12) are arranged in a rotational symmetry mode and are fixedly connected, and the whole joint connecting piece is in an X shape;

the joint connecting piece also comprises a third connecting pipe fitting (13), and the third connecting pipe fitting (13) is fixedly connected with one side of the first connecting pipe fitting (11) and/or one side of the second connecting pipe fitting (12);

the connector A and the connector B for inserting an external connecting rod are respectively arranged on two end faces of the first connecting pipe fitting (11) and the second connecting pipe fitting (12), and the connector C for inserting an external rod piece is arranged on at least one end face of the two end faces of the third connecting pipe fitting (13).

2. A joint connection according to claim 1, characterised in that the third connecting tube (13) is arranged axially of the rotational symmetry axes of the first (11) and second (12) connecting tubes and is fixedly connected to both the first (11) and second (12) connecting tubes.

3. The joint connection piece according to claim 2, wherein the first connection pipe (11) and the second connection pipe (12) are both L-shaped, and a connection space for the third connection pipe (13) to pass through is formed between the corners of the first connection pipe and the second connection pipe.

4. The knuckle connection piece according to claim 1, characterized in that said ports a, B and C are respectively arranged along the axial slots of said first (11), second (12) and third (13) connecting pipes;

the side walls of the first connecting pipe fitting and the second connecting pipe fitting, which are close to the connector A and the connector B, are respectively provided with an accommodating groove or a fixed connection accommodating pipe (14), and the openings of the accommodating grooves or the accommodating pipes (14) are arranged towards the same side of the joint connecting piece (1).

5. Joint connection according to claim 2, characterized in that the first (11) and second (12) connecting tube pieces are provided with fastening strips (15) along their axial direction on their inner side walls close to the joints A, B for guiding the insertion of an external connecting rod into the joints.

6. Joint connection according to claim 4, characterized in that said first (11), said second (12) and said third (13) connection tube are provided in one piece.

7. The articulated connection of claim 6, characterized in that reinforcing ribs (16) are integrally formed between the first (11), second (12) and third connecting tubes.

8. A chair frame, comprising: two articulated coupling elements (1) according to any of claims 1 to 7, the two articulated coupling elements (1) being arranged symmetrically opposite each other; further comprising:

the connecting rod structure (2) comprises a cross rod (21) which is inserted between the joints C of the two joint connecting pieces (1);

the underframe structure (3) comprises 4 support legs (31) which are used for being in plug-in fit with the interfaces A of the first connecting pipe fittings (11) in the two joint connecting pieces (1);

the supporting structure (4) comprises 4 supporting rods and is used for being in inserting fit with the interfaces B of the second connecting pipe fittings (12) in the two joint connecting pieces (1);

when the chair frame is in an unfolded state, 4 supporting legs (31) are respectively inserted into the interface A, 4 supporting rods are respectively inserted into the interface B, and the cross rod (21) is inserted between the interfaces C of the two joint connecting pieces (1);

when the chair frame is in a folded state, the supporting legs (31) and the supporting rod are separated from the interface A and the interface B and are respectively inserted into the accommodating grooves or the accommodating pipes (14) on the joint connecting pieces.

9. A chair frame according to claim 8, characterized in that the first connecting tube (11) and the second connecting tube (12) are inclined in an angle of 10-15 ° to the plane of the axes of rotation of the first and second connecting tubes.

10. A chair frame according to claim 9, characterized in that flexible connecting lines (6) are arranged between the legs (31), the support bar and the first connecting tube (11) and the second connecting tube (12).

11. The chair frame according to claim 10, wherein the first connecting pipe (11) and the second connecting pipe (12) are respectively provided with a first thread passing hole and a second thread passing hole for the flexible connecting rope (6) to pass through;

the flexible connecting rope (6) in the first connecting pipe fitting (11) penetrates through the first wire passing hole to connect the two support legs (31) inserted into the connector A;

and a flexible connecting rope (6) in the second connecting pipe fitting (12) passes through the second wire passing hole to connect the two support rods inserted into the connector B.

12. A chair frame according to claim 11, characterised in that said support bars comprise two seat support bars (41) and two back support bars (42);

back of the chair bracing piece (42) divide into folding first support section and second support section, support after the section is folded to first support section and second, the length of back of the chair bracing piece (42) equals seat face bracing piece (41).

13. A portable folding chair, characterized in that it comprises a seat (5) and a frame according to any one of claims 9-12;

the chair surface (5) comprises chair cloth (51) and 4 corner bags (52) arranged on the chair cloth (51);

when the portable folding chair is in an unfolded state, the chair frame is in an unfolded state, the corner bags (52) are sleeved at one ends, away from the joint connecting piece (1), of the seat surface supporting rod (41) of the chair frame and the chair back supporting rod (42), and the chair cloth (51) is spread on the chair frame to form a seat surface suitable for sitting;

when the portable folding chair is in a folding state, the chair frame is in a folding state, the corner bag (52) is separated from the seat face supporting rod (41) and the chair back supporting rod (42), and the chair cloth (51) is separated from the chair frame.