Folding swivel chair bracket

Abstract

The present invention relates to a folding swivel chair bracket, comprising: a seat frame and a chair foot frame; wherein: the seat frame comprises a first support rod bent into a U shape, a second support rod and a seat cushion rod which are hinged to each other, and a foldable connection is formed by a turntable and an axle rod locked on the first support rod; the seat frame is inserted into a guide tube of the chair foot frame with the aid of the axle rod to form a docking position with the chair foot frame, and the turntable on the seat frame abuts against the support plate of the chair foot frame to form a rotatable load-bearing support.

Description

Technical field:

[0001] The invention belongs to the field of folding chairs, and in particular relates to a folding swivel chair bracket, which can realize upper and lower split folding and storage, and upper and lower relative rotation. Background technology:

[0002] Patent application number 201710831683.9 discloses a split folding furniture support device, including: an upper support part and a lower support part; wherein: the upper support part is inserted into the guide tube of the lower support part by means of a shaft rod to form a docking position with the lower support part; the lower end surface of the upper main plate abuts against the upper end surface of the lower main plate to form a load-bearing support. The support device can be used to make folding tables, high-waisted stools, and swivel backrest chairs, and has the functions of splitting, folding, and rotating. The structure provides a rotatable solution by simply docking the upper and lower parts, but the matching upper support part is relatively complex and is limited by the folding method, which limits the extension and change of the product, especially the diversified design of the seat part.

[0003] Patent application No. 201920569842.7 discloses a swivel chair with adjustable leg length, including a chair frame assembly, a seat-foot connection assembly and a leg assembly. The chair frame assembly is rotatably connected to the leg assembly through the seat-foot connection assembly. The leg assembly includes a bushing for installing the seat-foot connection assembly, an upper leg fixing seat, four upper leg connectors, two telescopic upper leg tubes, two locking mechanisms, two lower leg tubes, four universal foot pads, four tie rods, a tie rod seat, a tie rod seat fixing tube and two upper leg tubes with reduced openings. The back tube can be flipped and folded forward through a flip seat, the two telescopic upper leg tubes and the two upper leg tubes with reduced openings can be folded inward, and the lower leg tube can be extended and retracted up and down in the telescopic upper leg tube by unlocking and locking the locking mechanism. This structure provides useful inspiration for the back tube to flip and fold forward, but the chair frame assembly and the leg assembly need to be connected through the seat-foot connection assembly, which is undoubtedly an obvious defect.

[0004] How to overcome the shortcomings of the prior art and provide a split and foldable solution with a large seat frame expansion space has become the subject of the present invention. Summary of the invention:

[0005] The purpose of the present invention is to design a seat cushion rod supported by two support rods bent into a U shape, and a split seat frame with a folding connection formed by a turntable and an axle rod, and the axle rod enters the chair foot frame guide tube to form a folding swivel chair bracket that can be flexibly connected and relatively rotated.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A folding swivel chair bracket comprises: a seat frame and a chair foot frame;

[0008] The chair leg frame comprises: a support plate, a sliding plate, a support foot, a connecting rod and a guide tube; the ends of a plurality of support feet are hinged on the support plate, and a corresponding number of connecting rods have one end hinged on the support foot and the other end hinged on the sliding plate; the guide tube is locked on the through hole of the support plate and passes through the central hole of the sliding plate;

[0009] The chair foot frame forms a rotatable support for the seat frame through a support plate and a guide tube;

[0010] Features:

[0011] The seat frame includes a turntable, and a first support rod, a second support rod and a seat cushion rod bent into a U shape, and the seat cushion is supported by the seat cushion rod of the U-shaped structure; the two bent sections of the first support rod and the second support rod can be rotatably hinged on the two bent sections of the seat cushion rod to jointly form a support for the seat cushion rod; an axle rod is locked in the middle of the middle section of the first support rod, and the axle rod can pass through the reserved hole on the turntable, and the middle part of the middle section of the second support rod is hinged on the turntable, and the first support rod and the second support rod can be foldably connected by the turntable.

[0012] The seat frame is opened to the right position, the plane formed by the seat cushion rod bent into a U-shaped structure is close to the horizontal plane, the middle section of the seat cushion rod faces the front of the seat, and the two bent sections are located at both sides of the seat.

[0013] The two bent sections of the seat cushion rod are further bent at 10 to 20 degrees in a vertical direction near the middle section, so that the seat cushion rod forms two planes, and a fabric support strip is also connected to the further bending parts of the two bent sections.

[0014] The two ends of the second support rod hinged to the seat cushion rod are provided with upward second rod extension sections, and the backrest support is formed by the two second rod extension sections.

[0015] The two ends of the first support rod and the second support rod hinged to the seat cushion rod both have upward extension sections, namely the first rod extension section and the second rod extension section, and the backrest support is formed by the two second rod extension sections; an armrest rod is hinged between the end of the first rod extension section and the second rod extension section.

[0016] The handrail rod is provided with an articulated seat at the articulated position with the end of the first rod extension section. The articulated seat is provided with a transverse slot hole. The articulated rivet passes through the transverse slot hole and is fixed to the end of the first rod extension section.

[0017] A folding swivel chair bracket comprises: a seat frame and a chair foot frame;

[0018] The chair leg frame comprises: a support plate, a sliding plate, a support foot, a connecting rod and a guide tube; the ends of a plurality of support feet are hinged on the support plate, and a corresponding number of connecting rods have one end hinged on the support foot and the other end hinged on the sliding plate; the guide tube is locked on the through hole of the support plate and passes through the central hole of the sliding plate;

[0019] The chair foot frame forms a rotatable support for the seat frame through a support plate and a guide tube;

[0020] Features:

[0021] The seat frame includes a turntable, a seat cushion rod, and a first support rod and a second support rod bent into a U-shaped structure; the ends of the bent sections on the same side of the first support rod and the second support rod can be rotatably hinged on a seat cushion rod, a seat circle for supporting seat fabric is locked between the two seat cushion rods, and a connection between the two seat cushion rods is formed by means of a closed or open seat circle; an axial rod is locked in the middle of the middle section of the first support rod, and the axial rod can pass through the reserved hole on the turntable, and the middle part of the middle section of the second support rod is hinged on the turntable, and the first support rod and the second support rod can be foldably connected by the turntable.

[0022] The first support rod bending section is longer than the second support rod bending section, corresponding to supporting the rear part of the seat, raising the seat cushion rod and the rear part of the seat circle to form an inclined state with low front and high rear. An auxiliary rod is also hinged between the first support rod and the second support rod bending section, and extends out of the first support rod.

[0023] The shape of the seat circle is selected from the following structures: circular; oval; rectangular; triangular; pentagonal; hexagonal; octagonal; trapezoidal; gourd-shaped; bread-shaped with an upper circle and a lower part; the seat ring is a closed structure.

[0024] The seat circle is shaped in one of the following shapes: circular; oval; rectangular; triangular; pentagonal; hexagonal; octagonal; trapezoidal; gourd-shaped; or bread-shaped with a circle on the top and a bottom on the bottom. The seat circle has an opening, and the opening is located between the bent sections of the second support rods at the front of the seat.

[0025] The split seat frame of the present invention adopts an axle rod and a guide tube to cooperate with each other, and is abutted on a support plate by means of a turntable, which not only forms a connection and positioning between the seat frame and the chair foot frame, but also provides a rotation axis center for the rotation of the seat frame; the two U-shaped support rods supporting the seat cushion rod are connected through the turntable, and the folding and opening process relies on the axle rod for guidance without breaking the constraint of the turntable, so the operation is smoother; the seat cushion can be directly carried by the seat cushion rod to form a simple stool, and the two ends of a support rod extend upward to form a swivel chair with a backrest, which is further expanded to a swivel chair with armrests, and the seat cushion rods on both sides are used to support seat cushion rings of various shapes to form more diverse folding chairs with rotation function. Description of the drawings:

[0026] The present invention will be further described below in conjunction with specific illustrations:

[0027] Figure 1 A three-dimensional diagram of a stool support is shown

[0028] Figure 2 A schematic diagram showing the side view of the stool support

[0029] Figure 3 Shows the split diagram of the stool bracket

[0030] Figure 4 Shows a schematic diagram of a swivel chair support

[0031] Figure 5 Shows a schematic diagram of the side of the swivel chair support

[0032] Figure 6 Shows the schematic diagram of the split state of the backrest swivel chair bracket

[0033] Figure 7 Schematic diagram showing the folded state of the backrest swivel chair bracket

[0034] Figure 8 Schematic diagram of armrest swivel chair bracket

[0035] Fig. 9 Shows Figure 8 A partial enlarged schematic diagram

[0036] Fig.10 A schematic diagram showing the side view of a swivel armchair

[0037] Fig.11 Shows the schematic diagram of the armrest swivel chair bracket split folding

[0038] Fig.12 A schematic diagram showing a swivel chair bracket

[0039] Fig.13 A schematic diagram showing the side view of the swivel chair bracket

[0040] Fig.14 Shows the exploded diagram of the swivel chair bracket

[0041] Fig.15 Schematic diagram showing the modeling swivel chair

[0042] Fig.16 The seat circle is a schematic diagram of a gourd-shaped bracket.

[0043] Fig.17 A schematic diagram showing a triangular bracket for the seat circle

[0044] Fig.18 The schematic diagram of the support frame with a round upper part and a bread-shaped lower part is shown.

[0045] Fig.19 A schematic diagram showing a trapezoidal support for the seat circle

[0046] Fig. 20 A schematic diagram showing a pentagonal bracket with a seating circle

[0047] Fig.21 Schematic diagram showing a hexagonal bracket with a seating circle

[0048] Fig. 22 Schematic diagram showing an octagonal bracket with a seating circle

[0049] Fig.23 Shows a schematic diagram of the open seating ring bracket

[0050] Fig.24 Shows a schematic diagram of the use of string-woven elastic cushion fabric

[0051] Fig.25 A schematic diagram showing the use of a second string-knit elastic cushion fabric

[0052] Fig.26 A schematic diagram showing three uses of string-knitted elastic cushion fabric

[0053] Fig. 27 A schematic diagram showing the use of a string-knit elastic cushion fabric

[0054] in

[0055] 100—Seat frame

[0056] 1—first support rod 11—first rod extension section

[0057] 2—Second support rod 21—Second rod extension section

[0058] 3—seat rod 31—fabric support strip

[0059] 32 - Seating circle 33 - Auxiliary rod

[0060] 4—Axis 5—Turntable

[0061] 200—Chair tripod

[0062] 6—Support plate 7—Sliding plate

[0063] 8—Supporting feet 81—Universal wheels

[0064] 9—Connecting rod 10—Guide tube

[0065] 300 - seat cushion 301 - seat cushion part

[0066] 302—Backrest 303—Webbing

[0067] 400—handrail 401—hinged seat

[0068] 402 - transverse slot 403 - rivet

[0069] X—bending sectionY—middle section Specific implementation method:

[0070] Embodiment 1:

[0071] Reference Figure 1 , Figure 2 and Figure 3 , which is a stool or bar stool support, providing the most basic function of a swivel chair. It includes: a seat frame 100 and a chair foot frame 200, both of which are separate and independently foldable structures. It is particularly noted that this structure involves three U-shaped structural rods, which, in addition to their respective numbers, are represented by X representing the bent section in the U-shaped structure, and Y representing the middle section in the U-shaped structure; however, the U-shaped structure is only a figurative description, which includes equivalent solutions of semicircular arc or V-shaped structures.

[0072] The seat frame 100 includes a first support rod 1, a second support rod 2 and a seat cushion rod 3 bent into a U-shaped structure, as well as an axle rod 4 and a turntable 5; the two bent sections X of the first support rod 1 and the second support rod 2 can be rotatably hinged on the two bent sections X of the seat cushion rod 3, together forming a support for the seat cushion rod 3; the middle part of the middle section Y of the first support rod 1 is locked with an axle rod 4, the axle rod 4 can pass through the reserved hole 51 on the turntable 5, the middle part of the middle section Y of the second support rod 2 is hinged on the turntable 5, and the turntable 5 constitutes a foldable connection between the first support rod 1 and the second support rod 2.

[0073] The seat frame 100 is fully opened, and the plane formed by the seat cushion rod 3 bent into a U-shaped structure is close to the horizontal plane, and the middle section Y of the seat cushion rod 3 faces the front of the seat, and the two bent sections X are located on both sides of the seat, so that the seat cushion 300 is supported by the U-shaped seat cushion rod 3. Figure 1 In the direction of the arrow.

[0074] This solution is a special case of using a stool, that is, the plane of the seat rod 3 should be horizontal, so that it can be kept slightly tilted as a bar stool, with a direction for sitting. A hard seat cushion, such as a formed composite board or plastic seat cushion 300, can be directly locked on the seat rod 3. For a seat cushion 300 made of flexible fabric, such as Oxford cloth, a rod can be added to the U-shaped opening of the seat rod 3 to form a closure, or it can be directly bent into a closed ring structure, such as a rectangular ring and an elliptical ring, which can form a tight support around the flexible fabric and keep the stool seat flat; and in the solution for a hard seat cushion, the seat rod 3 itself can be understood as the edge of the hard seat cushion, or integrated into the seat cushion.

[0075] In the scheme where the seat cushion of the seat is inclined forward or horizontal, the two bent sections X of the seat cushion rod 3 are further bent vertically downward by 10 to 20 degrees near the middle section, so that the seat cushion rod 3 forms two planes, and a fabric support strip 31 is connected to the further bending parts of the two bent sections X to prevent the flexible fabric seat cushion 300 from sinking; and after the further bending, the middle section Y of the seat cushion rod 3 sinks slightly to prevent the thighs from directly resting on the middle section Y.

[0076] The chair tripod 200 includes: a support plate 6, a sliding plate 7, a support leg 8, a connecting rod 9 and a guide tube 10; the ends of a plurality of support legs 8 are hinged on the support plate 6, and a corresponding number of connecting rods 9 are hinged on the support leg 8 at one end and hinged on the sliding plate 7 at the other end; the guide tube 10 is locked on the through hole of the support plate 6 and passes through the central hole of the sliding plate 7. The sliding plate 7 can slide along the outer wall of the guide tube 10 as it is opened or folded. The chair tripod 200 is a prior art and is also similar to a tripod in photographic equipment, and its function is not described in detail.

[0077] The chair foot frame 200 forms a rotatable support for the seat frame 100 through the support plate 6 and the guide tube 10, and the seat frame 100 can also be easily removed from the chair foot frame 200. Both can be folded. The folded chair foot frame 200 is horizontally attached to the side of the seat cushion frame 100 and fastened with a webbing or elastic band to form a portable and collectible whole. Figure 7 .

[0078] Embodiment 2:

[0079] Reference Figure 4 , Figure 5 , Figure 6 and Figure 7 , is a swivel chair bracket with backrest, which is also the most basic type. It not only meets the needs of comfortable sitting, but also has the characteristics of lightness. The general structure is the same as the above example, except that the second support member 2 is extended. The details are as follows:

[0080] The two ends of the second support rod 2 hinged to the seat rod 3 have upward second rod extension sections 21, and the backrest support is formed by the two second rod extension sections 21. The upper backrest, such as a hard backrest or a flexible backrest material, can be directly fixed on the second rod extension sections 21.

[0081] like Figure 6The seat frame 100 with the seat cushion and backrest can be taken out from the foot frame 200; the seat frame 100 can be partially folded, and the middle section Y of the seat cushion rod 3 and the second rod extension section 21 can be swung toward each other and folded in half; when the foot frame 200 is folded, the sliding plate 7 can be lifted upward, or the connecting rod 9 and the open part of the supporting foot 8 can be held together. The split parts are folded into place, and the foot frame 200 is placed horizontally and attached to the seat frame 100, especially to the side of the seat cushion rod 3 and the first supporting rod 1, to fill the space occupied by the turntable 5, and then the folded foot frame 200 is fastened with the webbing or elastic band reserved at the bottom of the seat cushion rod 3 or the lower side of the seat cushion to form a whole for easy storage and carrying. Figure 7 .

[0082] Embodiment three:

[0083] Reference Figure 8 , Fig. 9 , Fig.10 and Fig.11 , is a swivel chair bracket with armrests, forming a folding swivel chair with more complete functions, and a universal wheel 81 can be configured on the support foot 8 to meet the requirements of more flexible business occasions. The specific structure is as follows:

[0084] Both ends of the first support rod 1 and the second support rod 2 hinged to the seat rod 3 have upward extension sections, namely the first rod extension section 11 and the second rod extension section 21, and the backrest support is formed by the two second rod extension sections 21; an armrest rod 400 is hinged between the end of the first rod extension section 11 and the second rod extension section 21.

[0085] Furthermore, the handrail 400 is provided with an articulated seat 401 at the hinged position with the end of the first rod extension section 11, and the articulated seat 401 is provided with a transverse slot 402, and the articulated rivet 403 passes through the transverse slot 402 and is fixed to the end of the first rod extension section 11, which not only forms a constraint but also avoids the position space required for opening and folding into place. Fig.11 .

[0086] Embodiment 4:

[0087] Reference Fig.12 , Fig.13 and Fig.14 , is a swivel chair support with a basic structure similar to that of the first embodiment, except that the plane of the seat rod 3 after opening has a larger angle with the horizontal plane, and the seat rod 3 is separated into two for the sake of styling, and a seat circle 32 with a styling structure is introduced to connect the seat rod 3. In addition, the seat circle 32 also provides a wider hand rest function. The chair foot frame 200 is a general structure and will not be described one by one. The seat frame 100 is specifically as follows:

[0088] The seat frame 100 also includes: a turntable 5, an axle rod 4, a seat cushion rod 3, and a first support rod 1 and a second support rod 2 bent into a U-shaped structure; the ends of the bent sections X on the same side of the first support rod 1 and the second support rod 2 can be rotatably hinged on a seat cushion rod 3, and a seat ring 32 for supporting the seat fabric is locked between the two seat cushion rods 3. The seat ring 32 is used to form a connection between the two split seat cushion rods 3, and the seat ring 32 can be a closed structure or an open structure. Since the seat ring 32 is fixedly connected to the seat cushion rod 3 as a whole, when the seat ring 32 adopts an open structure, it is the same as the above examples.

[0089] The middle part of the middle section Y of the first support rod 1 is locked with an axial rod 4, which can pass through the reserved hole on the turntable 5. The middle part of the middle section Y of the second support rod 2 is hinged on the turntable 5, and the turntable 5 constitutes a foldable connection between the first support rod 1 and the second support rod 2.

[0090] Furthermore, the bending section of the first support rod 1 is longer than that of the second support rod 2, corresponding to the rear part of the supported seat, and the rear part of the seat cushion rod 3 and the seat back circle 32 are raised to form an inclined state with the front lower and the back higher. An auxiliary rod 33 is also hinged between the bending sections X of the first support rod 1 and the second support rod 2, and the auxiliary rod 33 extends out of the first support rod 1. The auxiliary rod 33 not only serves to connect the first support rod 1 and the second support rod 2, improve the overall rigidity, and improve the smoothness of the opening and folding process, but also can use the hanging webbing between the auxiliary rods 33 on both sides to provide support for the seat cushion part to prevent the seat cushion part from sinking excessively after bearing weight. It should be noted that the matching seat cushion 300 is a flexible fabric with integrated seat and backrest, and has a one-piece seat cushion part and backrest, or a flat elastic fabric.

[0091] Reference Fig.15 The seat circle 32 of the swivel chair is a closed ellipse or circular circle. The seat cushion 300 includes a seat cushion portion 301 and a backrest portion 302, both of which are made of flexible fabrics, such as Oxford cloth, and are sewn into a molded seat shape, that is, a seat shape; the edge of the seat cushion 300 fabric is set on the seat circle 32, and the whole is in a suspended state; in order to improve the support strength of the seat, two webbings 303 are hung between the two auxiliary rods 33, one in front and one in the back, and the latter webbing 303 is hung on the auxiliary rod 33 extending out of the first support rod 1, so as to expand the distance between the two webbings 303, support the seat cushion portion 302 more widely, and achieve the maximum reinforcement effect. In addition, the webbing 303 can be fixed to the bottom of the seat cushion portion 301 by direct sewing or compounding procedures. The reinforcement scheme of the webbing 303 is particularly suitable for the structure with an opening at the front end of the seat circle 32.

[0092] This embodiment provides more expansion space for the foldable swivel chair, and in particular, by using the seat circle 32, the following different shapes can be designed:

[0093] like Fig.12 Oval, containing similar circles;

[0094] like Fig.16 Gourd-shaped;

[0095] like Fig.17 triangle;

[0096] like Fig.18 The upper circle and the lower part are bread-shaped;

[0097] like Fig.19 Trapezoids, containing similar rectangles;

[0098] like Fig. 20 pentagon;

[0099] like Fig.21 hexagon;

[0100] like Fig. 22 Octagon;

[0101] In the above Fig.12 , Figures 16 to 22 The closed seat circle 32 involved can be matched with a seat cushion with a molded seat cushion portion 301 and a backrest portion 302, and a complete swivel chair product such as Fig.15 ; You can also use Figure 24 to Figure 27 The flat seat cushion 300 made of elastic material is displayed. After sitting down, it is deformed by gravity and can wrap around the buttocks and back to form a support for sitting. The elastic seat cushion 300 has various weaving schemes, such as Figure 24 to Figure 27 , to meet different design options, which are not listed here one by one.

[0102] Reference Fig.23 , is an open seat circle with a round upper part and a bread-shaped lower part, and its opening is located between the bent sections X of the second support rod 2 at the front of the seat, corresponding to the position of the legs after sitting. Since the two sides of the seat circle 32 are parallel and overlapped with the seat cushion rod 3, the seat circle can be strengthened by riveting, or the two can be combined and omitted, that is, the seat cushion rod 3 bent into a U shape can be directly used, similar to Figure 2 The difference is that the first support rod 1 has a lengthened bent section X, and the backrest support is formed by the raised middle section Y of the seat cushion rod 3, and the direction of the seat is just right with Figure 2 The opposite scenario.

[0103] The advantage of the open seat ring 32 is that, in addition to saving a section of material, the fabric of the seat cushion 301 and the webbing 303 form a soft support for the legs after sitting down, avoiding the feeling of being resting on the rod, and providing better comfort. The open seat ring design is also applicable to any seat ring shape.

[0104] In summary, if the two sides of the seat circle 32 overlap with the two seat rods 3, they can be combined for reduction or overlapped for reinforcement; if they cannot overlap, the widened area formed by the seat rods 3 and the seat circle 32 forms an armrest for resting the arms, which improves comfort. The open seat circle 32 is still suitable for any seat circle shape such as round, oval, rectangular, triangular, pentagonal, hexagonal, octagonal, trapezoidal, gourd-shaped, etc. In addition, when the seat frame 100 is folded, it is only necessary to lift the seat circle 32 or the rear part of the seat rod 3 and pull the first support rod 1 and the shaft rod 4 upward.

[0105] It should also be noted that during assembly, considering the positional relationship, the first support rod 1 is hinged to the shaft rod 4, the second support rod 2 is rotatably hinged to the turntable 5, and the seat rod 3 is hinged to the seat circle 32, all of which use sheet metal parts for transition, which is a conventional practice.

Claims

1. A folding swivel chair bracket, comprising: Seat frames and chair legs; The chair leg frame comprises: a support plate, a sliding plate, a support foot, a connecting rod and a guide tube; the ends of a plurality of support feet are hinged on the support plate, and a corresponding number of connecting rods have one end hinged on the support foot and the other end hinged on the sliding plate; the guide tube is locked on the through hole of the support plate and passes through the central hole of the sliding plate; The chair foot frame forms a rotatable support for the seat frame through a support plate and a guide tube; Features: The seat frame includes a turntable, and a first support rod, a second support rod and a seat cushion rod bent into a U shape, and the seat cushion is supported by the seat cushion rod of the U-shaped structure; the two bent sections of the first support rod and the second support rod can be rotatably hinged on the two bent sections of the seat cushion rod to jointly form a support for the seat cushion rod; an axle rod is locked in the middle of the middle section of the first support rod, and the axle rod can pass through the reserved hole on the turntable, and the middle part of the middle section of the second support rod is hinged on the turntable, and the first support rod and the second support rod can be foldably connected by the turntable.

2. A folding swivel chair bracket according to claim 1, characterized in that: The seat frame is fully opened, and the plane formed by the seat cushion rod bent into a U-shaped structure is close to the horizontal plane, and the middle section of the seat cushion rod faces the front of the seat, and the two bent sections are located at both sides of the seat.

3. The folding swivel chair bracket according to claim 2, characterized in that: The two bent sections of the seat cushion rod are further bent at 10 to 20 degrees in a vertical direction near the middle section, so that the seat cushion rod forms two planes, and a fabric support strip is connected to the further bending parts of the two bent sections.

4. A folding swivel chair bracket according to claim 1, 2 or 3, characterized in that: The two ends of the second support rod hinged to the seat cushion rod are provided with upward second rod extension sections, and the backrest support is formed by the two second rod extension sections.

5. A folding swivel chair bracket according to claim 1, 2 or 3, characterized in that: The first support rod and the second support rod are hinged at both ends with the seat rod, and both have upward extension sections, namely the first rod extension section and the second rod extension section, and the backrest support is formed by the two second rod extension sections; an armrest rod is hinged between the end of the first rod extension section and the second rod extension section.

6. The folding swivel chair bracket according to claim 5, characterized in that: The handrail rod is provided with an articulated seat at the articulated position with the end of the first rod extension section. The articulated seat is provided with a transverse slot hole. The articulated rivet passes through the transverse slot hole and is fixed to the end of the first rod extension section.

7. A folding swivel chair bracket, comprising: Seat frames and chair legs; The chair leg frame comprises: a support plate, a sliding plate, a support foot, a connecting rod and a guide tube; the ends of a plurality of support feet are hinged on the support plate, and a corresponding number of connecting rods have one end hinged on the support foot and the other end hinged on the sliding plate; the guide tube is locked on the through hole of the support plate and passes through the central hole of the sliding plate; The chair foot frame forms a rotatable support for the seat frame through a support plate and a guide tube; Features: The seat frame includes a turntable, a seat cushion rod, and a first support rod and a second support rod bent into a U-shaped structure; the ends of the bent sections on the same side of the first support rod and the second support rod can be rotatably hinged on a seat cushion rod, a seat circle for supporting seat fabric is locked between the two seat cushion rods, and a connection between the two seat cushion rods is formed by means of a closed or open seat circle; an axial rod is locked in the middle of the middle section of the first support rod, and the axial rod can pass through the reserved hole on the turntable, and the middle part of the middle section of the second support rod is hinged on the turntable, and the first support rod and the second support rod can be foldably connected by the turntable.

8. The folding swivel chair bracket according to claim 7, characterized in that: The first support rod bending section is longer than the second support rod bending section, corresponding to supporting the rear part of the seat, raising the seat cushion rod and the rear part of the seat back circle to form an inclined state with low front and high rear. An auxiliary rod is also hinged between the first support rod and the second support rod bending section, and extends out of the first support rod.

9. A folding swivel chair bracket according to claim 7 or 8, characterized in that: The shape of the seat circle is one of the following structures: round; oval; rectangular; triangular; pentagonal; hexagonal; octagonal; trapezoidal; gourd-shaped; bread-shaped with an upper circle and a lower part; the seat circle is a closed structure.

10. A folding swivel chair bracket according to claim 7 or 8, characterized in that: The shape of the seat circle is selected from the following structures: round; oval; rectangular; triangular; pentagonal; hexagonal; octagonal; trapezoidal; gourd-shaped; bread-shaped with a circle on the top and a bottom on the bottom; the seat circle is a structure with an opening, and the opening is located between the bent sections of the second support rods at the front of the seat.

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