Seat bracket and seat

Abstract

The present invention discloses a seat frame and a seat, comprising a support base and an expansion and folding assembly. The expansion and folding assembly comprises a longitudinal support member and a plurality of transverse rotating members, the plurality of transverse rotating members being arranged at intervals along the length of the support base. The transverse rotating members have a head end and a tail end along their length. The head end of the transverse rotating member is hinged to the support base, and the tail end of the transverse rotating member is hinged to the longitudinal support member. The transverse rotating member can rotate about its hinge point with the support base to drive the longitudinal support member to expand or retract relative to the support base along the width direction of the seat frame. When the longitudinal support member is retracted relative to the support base, the longitudinal support member moves closer to the support base; when the longitudinal support member is extended relative to the support base, the longitudinal support member moves away from the support base, and a support area is formed between the longitudinal support member and the support base. When the longitudinal support member is retracted relative to the support base, the overall width of the frame is significantly reduced, thereby reducing the overall volume of the frame for easier storage or transportation.

Description

Technical Field

[0001] The present invention relates to the field of seat furniture, and more particularly to a seat bracket and a seat. Background Art

[0002] Chairs are the most commonly used furniture. Traditionally, they are non-detachable, bulky, and heavy, leading to drawbacks such as inconvenient transportation and large storage space. To facilitate transportation, existing chairs typically separate the seat and backrest for separate storage or transportation. The seat and backrest are then reassembled when in use. Alternatively, the seat and backrest are rotatably connected, allowing them to rotate and fold for storage and transportation.

[0003] In a foldable, compact and easy-to-store leisure chair with application number "201922453253.5", a leisure chair is proposed, in which a groove is provided on the seat cushion frame, the backrest frame is rotatably connected to the seat cushion frame, and the backrest frame can be rotatably stored in the above-mentioned groove to achieve folding and storage.

[0004] However, when the seat and the backrest of the above-mentioned chair are rotated and folded to facilitate storage or folding, the width of the seat and the backrest remains unchanged, and the problem of being inconvenient to transport due to the large size still exists. Summary of the Invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a seat bracket that can adjust its own width and can be folded to the maximum limit to maximize the saving of packaging volume; further, the present invention provides a seat using the above seat bracket.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A seat bracket comprises a support seat and an expansion and closing assembly, wherein the expansion and closing assembly comprises a longitudinal support member and a plurality of transverse rotating members, wherein the plurality of transverse rotating members are arranged at intervals along the length direction of the support seat, and the transverse rotating member has a head end and a tail end along its own length direction, the head end of the transverse rotating member is hinged to the support seat, and the tail end of the transverse rotating member is hinged to the longitudinal support member, and the transverse rotating member can rotate around the hinge point with the support seat to drive the longitudinal support member to expand or retract relative to the support seat along the width direction of the seat bracket; when the longitudinal support member is retracted relative to the support seat, the longitudinal support member moves closer to the support seat; when the longitudinal support member is expanded relative to the support seat, the longitudinal support member moves away from the support seat, and a supporting area is formed between the longitudinal support member and the support seat.

[0008] In a further solution, the number of the unfolding and closing assemblies is two, and the two unfolding and closing assemblies are respectively arranged on both sides of the support seat, and the number of transverse rotating parts in the unfolding and closing assemblies on the same side of the support seat is at least two. When the longitudinal support member is unfolded relative to the support seat, the space between the longitudinal support members in the two unfolding and closing assemblies is the support area.

[0009] By providing two unfolding and folding components, which are respectively arranged on both sides of the support seat, the overall width of the seat bracket after unfolding is made larger, which is convenient for users to sit on.

[0010] In a further embodiment, a mesh is further included, which is laid on the supporting area. A slot is provided on the side wall of the longitudinal support member away from the support seat, and the slot extends along the length direction of the longitudinal support member. The opposite side edges of the mesh are wrapped with moldings, and the moldings are embedded in the slots. When the longitudinal support member is unfolded relative to the support seat, the mesh is tightened; when the longitudinal support member is retracted relative to the support seat, the mesh is folded.

[0011] The mesh is provided in the supporting area to form a support, and the mesh will be tightened or folded as the longitudinal support member is expanded or folded. In the process of expanding and closing the longitudinal support member, the mesh does not need to be disassembled, which is more convenient and quick.

[0012] By wrapping the two opposite edges of the mesh with fillets, the fillets are embedded in the slots on the longitudinal support members so that the mesh and the longitudinal support members are kept relatively fixed.

[0013] Traditional chairs use mesh inserts embedded in circular grooves to secure the mesh. This requires one person to hold one end of the mesh while another holds the other end to straighten it before inserting it into the circular groove. However, in this solution, the longitudinal support member can be extended or retracted relative to the support base via a transverse rotating member. The inserts on the edges of the mesh can be inserted into the slots while the longitudinal support member is retracted. The mesh can then be assembled while folded, allowing both ends to be inserted into the slots without requiring significant effort to straighten it. When the transverse rotating member is extended relative to the support base, it stretches the mesh, automatically straightening it and making installation more convenient.

[0014] At the same time, since the slot is located on the side wall of the longitudinal support member away from the support seat, when the longitudinal support member can be expanded relative to the support seat through the transverse rotating member, the strip is not easy to fall out of the slot, and there is no need to use nails to fix the mesh and the longitudinal support member, which saves costs, eliminates production steps, and improves production efficiency.

[0015] In addition, in this solution, since the upper and lower ends of the mesh do not need to be embedded in the slots on the longitudinal support members, the upper and lower ends of the mesh do not need to be wrapped with strips, which can save materials and avoid the problem that wrapping the upper and lower ends with strips will make the mesh difficult to fold.

[0016] In a further scheme, it also includes a baffle and a rotating shaft, the head end of the transverse rotating member is clamped between the baffle and the support seat, and the rotating shaft passes through the baffle, the transverse rotating member and the support seat in sequence; a limiting block is provided on one of the bottom end surface of the baffle and the top end surface of the transverse rotating member, and an arc-shaped limiting groove is provided on the other of the bottom end surface of the baffle and the top end surface of the transverse rotating member, the arc-shaped limiting groove is arranged coaxially with the rotating shaft, the limiting block is located in the arc-shaped limiting groove, and when the longitudinal support member is expanded to the end of the stroke relative to the support seat, the limiting block and the groove wall of the arc-shaped limiting groove are abutted.

[0017] By clamping the head end of the transverse rotating member between the baffle and the support base, the transverse rotating member is prevented from separating from the support base. Furthermore, by cooperating with the arc-shaped limiting groove and the limiting block, when the longitudinal support member is extended relative to the support base to the end of its travel, the limiting block abuts against the groove wall of the arc-shaped limiting groove, preventing the transverse rotating member from rotating without restriction.

[0018] In a further scheme, it also includes a baffle and a rotating shaft, the head end of the transverse rotating member is clamped between the baffle and the support seat, and the rotating shaft passes through the baffle, the transverse rotating member and the support seat in sequence; a limiting block is provided on one of the support seat and the transverse rotating member, and an arc-shaped limiting groove is provided on the other of the support seat and the transverse rotating member, the arc-shaped limiting groove is arranged cocentrically with the rotating shaft, the limiting block is located in the arc-shaped limiting groove, and when the longitudinal support member is expanded to the end of the stroke relative to the support seat, the limiting block and the groove wall of the arc-shaped limiting groove are abutted.

[0019] The present invention also proposes a chair, including the seat bracket in the above-mentioned scheme, wherein there are two seat brackets, namely a back bracket and a seat bracket, the back bracket having a head end and a tail end along its own length direction, and the seat bracket having a front end and a rear end along its own length direction, the back bracket is arranged longitudinally, the seat bracket is arranged horizontally, and the tail end of the back bracket is detachably connected to the rear end of the seat bracket, after the back bracket and the seat bracket are disassembled, the back bracket is stacked on top of the seat bracket, the support seat in the back bracket is offset against the support seat in the seat bracket, and the support seat in the back bracket is located between the two longitudinal support members in the seat bracket.

[0020] Since the tail end of the back support is detachably connected to the rear end of the seat support, when storage or transportation is required, the back support only needs to be removed from the seat support and stacked, which can greatly reduce the overall occupied space and facilitate storage and transportation of the chair.

[0021] By stacking the back support on top of the seat support, the support seat in the back support is located between the two longitudinal support members in the seat support, and the back support and the seat support partially overlap in the vertical direction, making the overall volume smaller and more convenient for transportation and storage.

[0022] In a further solution, a headrest assembly is also included, which includes a sleeve, which is arranged at the head end of the back bracket, a sliding support member is inserted into the sleeve, and a headrest is provided at the head end of the sliding support member. The sliding support member is provided with multiple grooves at intervals along its own length direction, a spring bead is provided on the support seat in the back bracket, and a through hole is provided on the sleeve, which is opposite to the spring bead. After the sliding support member slides along the sleeve to a specified height, the spring bead passes through the through hole and is embedded in the corresponding groove.

[0023] The headrest in the headrest assembly supports the user's head. The height of the headrest is adjusted by sliding the sliding support member within the sleeve. In addition, since the sliding support member is provided with multiple grooves spaced apart along its length, a spring bead is provided on the support seat in the back bracket, and a through hole is provided on the sleeve, which is directly opposite the spring bead. After the sliding support member slides along the sleeve to a specified height, the spring bead passes through the through hole and embeds into the corresponding groove. The spring bead limits the sliding support member to prevent it from moving up and down after sliding to the specified height. The spring bead also provides the user with a certain damping feeling, and the gear adjustment can be clearly felt when moving the sliding support member.

[0024] In a further solution, the sleeve is detachably connected to the support seat in the back bracket, and a locking member is provided on the transverse rotating member, and a step groove is provided on the locking member; when the sleeve and the support seat are in a disassembled state, the transverse rotating member can rotate around the hinge point between it and the support seat to drive the longitudinal support member to expand or retract relative to the support seat; when the longitudinal support member is expanded to the end of the stroke relative to the support seat, the sleeve can be inserted into the step groove and connected to the support seat, so that the transverse rotating member and the support seat remain relatively fixed.

[0025] The sleeve is detachably connected to the support base in the backrest. To rotate the transverse rotating member to extend or retract the longitudinal support member relative to the support base, the sleeve is removed. When the longitudinal support member reaches the end of its travel relative to the support base, the sleeve is inserted into the stepped groove of the locking member and connected to the support base, maintaining relative fixation between the transverse rotating member and the support base, preventing the transverse rotating member from automatically rotating downward due to gravity. This means the headrest serves both as a head support and a position limiter.

[0026] In a further embodiment, the seat support is further provided with an armrest, with a connecting seat formed at the bottom end of the armrest. The connecting seat, the transverse rotating member, and the longitudinal support member are fixed to each other at three points by bolts, thereby maintaining the transverse rotating member and the longitudinal support member relatively fixed. In other words, the armrest not only supports the human arm but also locks the seat support.

[0027] The present invention also proposes a seat, including the seat bracket in the above-mentioned scheme, wherein there are two seat brackets, namely a back bracket and a seat bracket, the back bracket having a head end and a tail end along its own length direction, and the seat bracket having a front end and a rear end along its own length direction, the back bracket is arranged longitudinally, the seat bracket is arranged horizontally, and the tail end of the back bracket is detachably connected to the rear end of the seat bracket; the head end of the back bracket is provided with a sleeve, a sliding support member is inserted into the sleeve, the head end of the sliding support member is provided with a headrest, and a protrusion is provided on the sleeve, and the protrusion is abutted against the baffle surface on the back bracket.

[0028] When the user's head rests on the headrest, it exerts a forward force on the rear end of the sliding support, and the protrusion on the sleeve abuts against the baffle surface on the back support, thereby offsetting the forward force and preventing the sliding support from bending.

[0029] Beneficial effects

[0030] 1. Since the head end of the transverse rotating member in the expansion and folding assembly is hinged to the support base, the transverse rotating member can drive the longitudinal support member to expand or retract relative to the support base along the width direction of the seat frame. When the longitudinal support member is retracted relative to the support base, the longitudinal support member moves closer to the support base, and the overall width of the frame is greatly reduced, thereby reducing the overall volume of the frame for easy storage or transportation.

[0031] 2. Since the tail end of the transverse rotating member is hinged to the longitudinal support member, when the transverse rotating member drives the longitudinal support member to expand or retract relative to the support seat along the width direction of the seat bracket, the longitudinal support member can also adjust its own angular position to avoid interference with the support seat or other components.

[0032] 3. The seat bracket is equipped with the above structure, which makes it easy to modularize. It can adapt to different sizes by simply changing the length of the horizontal rotating part. At the same time, changing the length of the longitudinal support part can meet the needs of people of different heights, making it easier for different people to use.

[0033] 4. Compared with the traditional method of fixing the seat by embedding the strips on the mesh through the circular groove, it requires two people to cooperate or use a special stretching machine to straighten the mesh strips before inserting them into the circular groove; the present invention wraps the opposite edges of the mesh with strips, and the strips are embedded in the grooves on the longitudinal support members so that the mesh and the longitudinal support members remain relatively fixed; and in this solution, since the longitudinal support members can be expanded or retracted relative to the support seat by the transverse rotating member, the strips on the edge of the mesh can be embedded in the grooves when the longitudinal support members are in the retracted or relaxed state, so the assembly is relatively easy, and the strips can be embedded in the grooves without forcibly stretching the mesh. When the transverse rotating member is expanded relative to the support seat, it will drive the mesh to stretch so that the mesh is automatically stretched, and the installation is more convenient.

[0034] At the same time, the mesh and the longitudinal support members do not need to be fixed with nails, which saves costs, eliminates production steps, and improves production efficiency.

[0035] 5. When the chair bracket of the present invention is used as a seat bracket, when the transverse rotating member is unfolded, an armrest is connected between it and the longitudinal support member. At this time, the armrest not only supports the human arm, but also locks the seat bracket, so that the transverse rotating member remains in an open state. At this time, the transverse rotating member and the longitudinal support member remain relatively fixed.

[0036] When the seat support of the present invention is used as a back support, when the lateral rotating parts are unfolded, the headrest is inserted between two adjacent lateral rotating parts, so that the two lateral rotating parts remain relatively fixed. At this time, the headrest not only supports the head, but also plays a role of limiting the position, which also kills two birds with one stone. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of a seat without a mesh in Example 1 in an unfolded state;

[0038] Figure 2 A partial structural diagram and a partial enlarged diagram of the seat support in Example 1;

[0039] Figure 3 Schematic diagram of the structure of the baffle in Example 1;

[0040] Figure 4 Schematic diagram of the structure of the transverse rotating member in Example 1;

[0041] Figure 5A schematic diagram and a partial enlarged view of the structure of the back support in Example 1;

[0042] Figure 6 A front view and a partially enlarged view of the seat with mesh fabric in Example 1;

[0043] Figure 7 For Example 1 Figure 6 Cross-sectional view of AA;

[0044] Figure 8 This is a schematic diagram of the structure of the seat support in the unfolded state in Example 1;

[0045] Figure 9 This is a schematic diagram of the structure of the seat support in the folded state in Example 1;

[0046] Figure 10 A top view of the seat support in the folded state in Example 1;

[0047] Figure 11 This is a schematic diagram of the structure of the seats after they are folded and stacked in Example 1;

[0048] Figure 12 A schematic diagram and a partial enlarged view of the structure of the back support in Example 2;

[0049] Figure 13 This is a structural diagram and a partial enlarged view of the back support in Example 2;

[0050] Figure 14 It is a structural schematic diagram and a partial enlarged view of the seat support in Example 2.

[0051] Explanation of the numbers in the schematic diagram:

[0052] 1-seat support, 2-back support, 3-support base, 4-unfolding assembly, 5-lateral rotation member, 6-longitudinal support member, 7-slot, 8-baffle, 9-limit block, 10-arc-shaped limit groove, 11-jack, 12-boss, 13-sleeve, 14-sliding support member, 15-headrest, 16-groove, 17-spring bead, 18-protrusion, 19-mesh, 20-inlay, 21-locking member, 22-step groove, 23-armrest, 24-connecting block, 25-connecting base. DETAILED DESCRIPTION

[0053] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and specific embodiments.

[0054] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0055] Example 1: Please refer to Figure 1-11 This embodiment provides a chair comprising two seat frames, namely a seat frame 1 and a back frame 2. The back frame 2 has a leading end and a trailing end along its length, while the seat frame 1 has a front end and a rear end along its length. The back frame 2 is arranged longitudinally, while the seat frame 1 is arranged horizontally. The trailing end of the back frame 2 is detachably connected to the rear end of the seat frame 1. For storage or transport, the back frame 2 can be removed from the seat frame 1 and stacked, significantly reducing the overall space required for storage and transport.

[0056] In this embodiment, both the seat support 1 and the back support 2 include a support base 3 and an unfolding assembly 4. The unfolding assembly 4 includes a longitudinal support member 6 and a plurality of transverse rotating members 5, and the plurality of transverse rotating members 5 are arranged at intervals along the length direction of the support base 3. The transverse rotating member 5 has a head end and a tail end along its own length direction. The head end of the transverse rotating member 5 is hinged to the support base 3, and the tail end of the transverse rotating member 5 is hinged to the longitudinal support member 6. The transverse rotating member 5 can rotate around its hinge point with the support base 3 to drive the longitudinal support member 6 to expand or retract relative to the support base 3 along the width direction of the seat support. As a preferred embodiment, in this embodiment, the number of unfolding assemblies 4 is two, and the two unfolding assemblies 4 are respectively arranged on both sides of the support base 3, and the number of transverse rotating members 5 in the unfolding assembly 4 located on the same side of the support base 3 is at least two.

[0057] When the user needs to use the seat for support, they only need to rotate the transverse rotating members 5 on both sides of the support base 3 in the seat frame. The transverse rotating members 5 drive the longitudinal support members 6 to expand relative to the support base 3, and the longitudinal support members 6 then move away from the support base 3. The overall width of the seat frame increases, and the space between the longitudinal support members 6 in the two expansion and contraction assemblies 4 forms a support area.

[0058] In order to facilitate users to lean or sit, a mesh 19 is laid on the support area, and the two ends of the mesh 19 are respectively fixed to the longitudinal support members 6 in the two unfolding components 4. Figure 6As shown, a slot 7 is provided on the sidewall of the longitudinal support member 6, away from the support base 3. This slot 7 extends along the length of the longitudinal support member 6. The mesh 19 is wrapped with strips 20 on opposite sides of the edge. These strips 20 fit into the corresponding slots 7 to maintain relative fixation between the mesh 19 and the longitudinal support member 6. When the transverse rotating member 5 drives the longitudinal support member 6 to expand relative to the support base 3, the longitudinal support member 6 also drives the mesh 19 to expand, keeping it taut for the user to lean on or sit on.

[0059] When the seat needs to be stored or transported, the lateral rotating members 5 on either side of the support base 3 in the seat frame need only be rotated in the opposite direction. This will cause the longitudinal support members 6 to retract relative to the support base 3. The longitudinal support members 6 will then move closer to the support base 3, and the mesh 19 will be folded. This will reduce the overall width of the seat frame, making it easier to store or transport the seat. Because the mesh 19 will tighten or fold as the longitudinal support members 6 are expanded or contracted, there is no need to disassemble or assemble the mesh 19 during the expansion and contraction process, making it more convenient and quicker.

[0060] At the same time, mesh 19 can be assembled by inserting the edge strips 20 of mesh 19 into the slots 7 while the longitudinal support member 6 is in the retracted position. Mesh 19 can be assembled while in its folded state, eliminating the need for the user to pull the mesh 19 forcefully to straighten it before inserting its ends into the slots 7. The mesh 19, in its folded state, first inserts the strips 20 into the slots 7 of the longitudinal support member 6. When the transverse rotating member 5 drives the longitudinal support member 6 to unfold relative to the support base 3, the longitudinal support member 6 naturally stretches the mesh 19, placing it in a taut position. Furthermore, because the slot 7 is located on the sidewall of the longitudinal support member 6 away from the support base 3, the strips 20 are unlikely to dislodge from the slot 7 during the process of the longitudinal support member 6 being unfolded relative to the support base 3 by the transverse rotating member 5. The mesh 19 and longitudinal support member 6 assembly does not require the use of nail guns for fastening, saving costs, eliminating production steps, and improving production efficiency. In addition, in this solution, the upper and lower ends of the mesh 19 do not need to be wrapped with the fillet strips 20, which can save materials and avoid the problem that wrapping the upper and lower ends with the fillet strips 20 will make the mesh 19 difficult to fold.

[0061] After folding the transverse rotating member 5, the seat frame 1 and back frame 2 can be separated as previously described, with the back frame 2 stacked on top of the seat frame 1. The bottom end surface of the support base 3 in the back frame 2 abuts against the top end surface of the support base 3 in the seat frame 1, and the support base 3 in the back frame 2 is located between the two longitudinal support members 6 in the seat frame 1. The back frame 2 and seat frame 1 partially overlap in the vertical direction, making the overall volume smaller and more convenient for transportation and storage.

[0062] Of course, it is also feasible to stack the seat support 1 on top of the back support 2. It is also feasible to first separate the seat support 1 and the back support 2, and then rotate the horizontal rotating member 5 to drive the longitudinal support member 6 to fold relative to the support base 3.

[0063] In order to accommodate the needs of people of different heights, or to meet the different seat width requirements of people of similar heights, the seat frame, equipped with the above structure, can be easily modularized. Simply by changing the length of the transverse rotating member 5, it can be adapted to the needs of different sizes. Simultaneously, by changing the length of the longitudinal support member 6, it can also be adapted to the needs of people of different heights, thereby facilitating use by different groups of people.

[0064] In this solution, the seat support further includes a baffle 8 and a rotation shaft, such as Figure 2 and Figure 3 As shown, the baffle 8 spans the width of the support base 3 and extends across the head ends of the transverse rotating members 5 in the two unfolding and closing assemblies 4. The head ends of the transverse rotating members 5 are sandwiched between the baffle 8 and the support base 3. The rotation axis passes through the baffle 8, the transverse rotating member 5, and the support base 3 in sequence, allowing the transverse rotating member 5 to rotate relative to the baffle 8 and the support base 3. The top surface of the transverse rotating member 5 is provided with an arc-shaped limit groove 10 that is concentric with the rotation axis, while the bottom surface of the baffle 8 is provided with a limit block 9, which is located within the arc-shaped limit groove 10. When the longitudinal support member 6 is unfolded to the end of its stroke relative to the support base 3, the limit block 9 abuts against the groove wall of the arc-shaped limit groove 10. This prevents the transverse rotating member 5 from rotating without restriction. Of course, it is also feasible to set the limit block 9 on the top surface of the transverse rotating member 5 and the arc-shaped limit groove 10 on the bottom surface of the baffle 8.

[0065] In another limiting scheme, see Figure 4 and Figure 5 The seat frame still includes a baffle 8 and a rotation shaft. The head end of the transverse rotation member 5 is sandwiched between the baffle 8 and the support base 3, and the rotation shaft sequentially passes through the baffle 8, the transverse rotation member 5, and the support base 3. The head end of the transverse rotation member 5 is provided with a socket 11, and a stopper 9 is disposed on the wall of the socket 11. The top surface of the support base 3 is provided with a boss 12, which is inserted into the socket 11. The outer wall of the boss 12 is partially recessed inward, and the recessed portion cooperates with the wall of the socket 11 to form an arcuate stopper groove 10, in which the stopper 9 is located. When the longitudinal support member 6 is extended to the end of its travel relative to the support base 3, the stopper 9 abuts against the wall of the arcuate stopper groove 10.

[0066] In addition, a headrest assembly is provided on the back support 2. Figure 7As shown, the headrest assembly includes a sleeve 13, which is arranged at the head end of the back bracket 2, and a sliding support 14 is inserted into the sleeve 13, and a headrest 15 is provided at the head end of the sliding support 14. The sliding support 14 is provided with a plurality of grooves 16 at intervals along its own length direction, and a spring bead 17 is provided on the support seat 3 in the back bracket 2. A through hole is provided on the sleeve 13, and the through hole is opposite to the spring bead 17. After the sliding support 14 slides along the sleeve 13 to a specified height, the spring bead 17 passes through the through hole and is embedded in the corresponding groove 16.

[0067] The headrest 15 in the headrest assembly supports the back of the user's head. The height of the headrest 15 can be adjusted by sliding the sliding support 14 within the sleeve 13. Furthermore, since the sliding support 14 has multiple grooves 16 spaced apart along its length, a spring bead 17 is provided on the support seat 3 in the back support 2, and a through hole is provided on the sleeve 13, which is aligned with the spring bead 17. After the sliding support 14 slides along the sleeve 13 to a specified height, the spring bead 17 passes through the through hole and engages with the corresponding groove 16. The spring bead 17 limits the sliding support 14, preventing it from moving up and down after sliding to the specified height. The spring bead 17 also provides the user with a certain damping effect, allowing the user to clearly feel the gear adjustment when moving the sliding support 14.

[0068] As is easy to understand, when the back of the user's head rests on the headrest 15, it exerts a forward force on the rear end of the sliding support member 14. In this embodiment, a protrusion 18 is provided on the outer wall of the sleeve 13, which abuts against the surface of the baffle 8 on the back support 2. This abutment between the protrusion 18 and the baffle 8 on the back support 2 offsets this forward force, thereby preventing the sliding support member 14 from bending.

[0069] Example 2: Please refer to Figure 12-14 The main difference between the chair of this embodiment and the first embodiment is that the sleeve 13 of this embodiment is detachably connected to the support base 3 of the back support 2. Specifically, the sleeve 13 and the support base 3 of the back support 2 are snap-fitted. Of course, a detachable connection can also be achieved using fasteners such as bolts.

[0070] In this embodiment, a locking member 21 is provided on the transverse rotating member 5. Specifically, the locking member 21 is disposed on the sidewall of the head end of the transverse rotating member 5, and its extension direction is perpendicular to the length of the transverse rotating member 5. When the transverse rotating member 5 needs to be rotated to drive the longitudinal support member 6 to expand or retract relative to the support base 3, the sleeve 13 is first removed to prevent interference between the sleeve 13 and the locking member 21. The locking member 21 is also provided with a stepped groove 22. When the longitudinal support member 6 is extended relative to the support base 3 to the end of its travel (i.e., when the longitudinal support member 6 is extended so that the mesh 19 is in a taut state), the sleeve 13 is installed and fixed to the support base 3. At this time, the sleeve 13 is inserted into the stepped groove 22 and is located in the rotation path of the locking member 21. When the transverse rotating member 5 intends to rotate about its hinge point with the support base 3, the sleeve 13 limits the groove wall of the stepped groove 22, thereby maintaining the transverse rotating member 5 relative to the support base 3. The transverse rotating member 5 cannot rotate relative to the support base 3, thereby preventing the transverse rotating member 5 from rotating due to the action of gravity or the force of the human back.

[0071] In addition, in this embodiment, the seat support 1 is also provided with an armrest 23, and a connecting seat 25 is formed at the bottom end of the armrest 23. When the transverse rotating member 5 on the seat support 1 drives the longitudinal support member 6 to expand relative to the support seat 3, the connecting seat 25 is fixed to the transverse rotating member 5 and the longitudinal support member 6 at three points via bolts. As a specific embodiment, the connecting seat 25 is provided with a slot, into which the transverse rotating member 5 is inserted and fixedly connected via bolts. At the same time, connecting blocks 24 are provided on both sides of the connecting seat 25. The connecting blocks 24 on both sides are inserted into bolts and connected to the longitudinal support member 6 to achieve three-point fixation. The longitudinal support member 6 and the transverse rotating member 5 are both fixed to the connecting seat 25 at the bottom end of the armrest 23, thereby preventing the transverse rotating member 5 from closing and rotating due to external forces when sitting.

[0072] Example 3: The chair in this embodiment differs primarily from Example 1 in that the head end of the transverse rotating member 5 is hingedly connected to a rotating block. The hinged connection between the transverse rotating member 5 and the rotating block is similar to the hinged connection between the transverse rotating member 5 and the support base 3 in Example 1, and therefore will not be described in detail here. The rotating block is also rotatably connected to the support base 3 via a universal joint. The universal joint enables the rotating block to drive the transverse rotating member 5 and the longitudinal support member 6 to rotate relative to the support base 3 from the sides of the support base 3 toward the center of the support base 3, thereby causing the longitudinal support members 6 in the two deployable and collapsible assemblies 4 to align or deploy.

[0073] When the seat frame needs to be deployed for seating, the universal joint is first rotated to deploy the longitudinal supports 6 in the two deployment assemblies 4. The transverse rotation member 5 is then rotated about its hinge point with the support base 3 to deploy the longitudinal supports 6 along the width of the seat frame relative to the support base 3. To ensure that the transverse rotation member 5 and the longitudinal supports 6 remain fixed relative to the support base 3 when deployed, the transverse rotation member 5 is provided with a socket (not shown) into which a bolt is inserted to threadably connect with the support base 3, maintaining relative fixation between the transverse rotation member 5 and the support base 3.

[0074] When the seat needs to be folded and stored, it is only necessary to remove the bolts, then rotate the transverse rotating member 5 to drive the longitudinal support member 6 to be retracted relative to the support seat 3 along the width direction of the seat bracket, and then rotate the universal joint to align the longitudinal support members 6 in the two unfolding assemblies 4 to complete the storage.

[0075] Example 4: The main difference between the seat in this embodiment and the above-mentioned Example 1 is that the transverse rotating members 5 in the two unfolding and closing assemblies 4 in the same seat frame in this embodiment are symmetrical to each other, and the head ends of the two symmetrical transverse rotating members 5 are connected to each other to form a transverse support rod. The transverse support rod is not connected to the support seat 3 by a hinge. In this solution, the transverse support rod and the support seat 3 are detachably connected by bolts. The two ends of the transverse support rod are respectively connected to the two longitudinal support members 6. When the seat needs to be folded and stored, the bolts on the transverse support rod are removed, and the transverse support rod, i.e., the longitudinal support member 6, can be removed from the support seat 3 to complete the storage.

[0076] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A seat, characterized in that: The foldable seat frame is a seat frame having a plurality of longitudinal supports and a plurality of transverse rotating members, wherein the plurality of transverse rotating members are arranged at intervals along the length direction of the support frame, the transverse rotating member has a head end and a tail end along its own length direction, the head end of the transverse rotating member is hinged to the support frame, and the tail end of the transverse rotating member is hinged to the longitudinal support, and the transverse rotating member can rotate around the hinge point between it and the support frame to drive the longitudinal support member to expand or retract relative to the support frame along the width direction of the seat frame; when the longitudinal support member is retracted relative to the support frame, the longitudinal support member moves closer relative to the support frame; when the longitudinal support member is expanded relative to the support frame, the longitudinal support member moves away from the support frame, and a supporting area is formed between the longitudinal support member and the support frame; the number of the seat frames is two, and the two seat frames are respectively a back frame and a seat frame, the back frame has a head end and a tail end along its own length direction, and the seat frame has a front end and a rear end along its own length direction, the back frame is longitudinally arranged, the seat frame is horizontally arranged, and the back frame The tail end of the bracket is detachably connected to the rear end of the seat bracket. After the back bracket and the seat bracket are detached, the back bracket is stacked on top of the seat bracket, the support seat in the back bracket is against the support seat in the seat bracket, and the support seat in the back bracket is located between the two longitudinal support members in the seat bracket; it also includes a headrest assembly, which includes a sleeve, which is arranged at the head end of the back bracket, a sliding support member is inserted in the sleeve, and a headrest is provided at the head end of the sliding support member, and the sleeve is detachably connected to the support seat in the back bracket. Then, a locking piece is provided on the transverse rotating piece, and the extension direction of the locking piece is perpendicular to the length direction of the transverse rotating piece; a step groove is provided on the locking piece; when the sleeve and the support seat are in a disassembled state, the transverse rotating piece can rotate around the hinge point between it and the support seat to drive the longitudinal support piece to expand or retract relative to the support seat; the sleeve is located on the rotation path of the locking piece, and when the longitudinal support piece is expanded to the end of the stroke relative to the support seat, the sleeve can be inserted into the step groove and connected to the support seat, so that the transverse rotating piece and the support seat remain relatively fixed.

2. The seat according to claim 1, characterized in that There are two unfolding and closing assemblies, which are arranged on both sides of the support seat. There are at least two transverse rotating parts in the unfolding and closing assemblies on the same side of the support seat. When the longitudinal support members are unfolded relative to the support seat, the space between the longitudinal support members in the two unfolding and closing assemblies is the supporting area.

3. The seat according to claim 2, characterized in that It also includes a mesh, which is laid on the supporting area. A slot is provided on the side wall of the longitudinal support member away from the support seat, and the slot extends along the length direction of the longitudinal support member. The opposite side edges of the mesh are wrapped with moldings, and the moldings are embedded in the slots; when the longitudinal support member is unfolded relative to the support seat, the mesh is tightened; when the longitudinal support member is retracted relative to the support seat, the mesh is folded.

4. The seat according to claim 1, characterized in that It also includes a baffle and a rotating shaft, the head end of the transverse rotating member is clamped between the baffle and the support seat, and the rotating shaft passes through the baffle, the transverse rotating member and the support seat in sequence; a limiting block is provided on one of the bottom end surface of the baffle and the top end surface of the transverse rotating member, and an arc-shaped limiting groove is provided on the other of the bottom end surface of the baffle and the top end surface of the transverse rotating member, the arc-shaped limiting groove is arranged cocentrically with the rotating shaft, the limiting block is located in the arc-shaped limiting groove, and when the longitudinal support member is expanded to the end of the stroke relative to the support seat, the limiting block is against the groove wall of the arc-shaped limiting groove.

5. The seat according to claim 1, wherein: It also includes a baffle and a rotating shaft, the head end of the transverse rotating member is clamped between the baffle and the support seat, and the rotating shaft passes through the baffle, the transverse rotating member and the support seat in sequence; a limiting block is provided on one of the support seat and the transverse rotating member, and an arc-shaped limiting groove is provided on the other of the support seat and the transverse rotating member, the arc-shaped limiting groove is arranged cocentrically with the rotating shaft, the limiting block is located in the arc-shaped limiting groove, and when the longitudinal support member is expanded to the end of the stroke relative to the support seat, the limiting block and the groove wall of the arc-shaped limiting groove are abutted.

6. The seat according to claim 1, wherein: The sliding support is provided with a plurality of grooves at intervals along its length direction, a spring bead is provided on the support seat in the back bracket, a through hole is provided on the sleeve, and the through hole is directly opposite to the spring bead. After the sliding support slides along the sleeve to a specified height, the spring bead passes through the through hole and is embedded in the corresponding groove.

7. The seat according to claim 1, characterized in that The seat bracket is also provided with an armrest, and the bottom end of the armrest is formed with a connecting seat. The connecting seat, the transverse rotating member and the longitudinal supporting member are fixed at three points by bolts, so that the transverse rotating member and the longitudinal supporting member remain relatively fixed.

8. The seat according to claim 4 or 5, characterized in that A protrusion is provided on the sleeve, and the protrusion abuts against the baffle surface on the back support.

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