An adjustable chair frame mechanism and a chair

Abstract

The present invention discloses an adjustable chair frame mechanism, comprising two chair frames arranged at intervals on the left and right, and at least one adjustment mechanism; the adjustment mechanism comprises a first support seat and a second support seat respectively supported on the two chair frames, a first adjustment tube arranged on the first support seat, and a second adjustment tube arranged on the second support seat; the first adjustment tube and the second adjustment tube extend left and right, and the two are in a sleeve relationship and the sleeve length is adjustable. The present invention also discloses a chair. The present invention has the beneficial effect of being easy to assemble and easy to adjust the tension of the seat surface.

Description

Technical Field

[0001] The invention relates to an adjustable chair frame mechanism and a chair. Background Art

[0002] The cost of chair manufacturing industry includes material cost, labor cost, manufacturing cost and transportation cost. A very important factor affecting transportation cost is the loading volume of chairs. For chairs that can be assembled and disassembled, the space they occupy before assembly is inversely proportional to the loading volume. Therefore, increasing the volume compression ratio of chairs when loading is an important means to save transportation cost.

[0003] For example, the patent application with publication number CN204336339U discloses a folding chair, including a backrest, a seat, a connecting piece and a locking piece. The backrest and the seat are connected by a connecting piece, and the backrest and the seat rotate around the connecting piece between a first position and a second position, wherein in the first position, the backrest is approximately in an upright position, and in the second position, the backrest is folded and is in a position that fits the seat, and the locking piece includes a first part and a second part, the first part is located on the backrest, and the second part is located on the seat, the first part and the second part of the locking piece cooperate, and the backrest can move relative to the seat in the direction of its rotation axis so that the first part and the second part are locked or disengaged, thereby preventing or allowing the backrest and the seat from rotating relative to each other. The chair has a large number of connecting pieces and locking pieces that realize the folding function of the backrest, and the structure is relatively complex. Since the folding and storage function is mainly used in the transportation process, the probability of use in actual use is low, so the cost of adding this part of the function is low in cost performance.

[0004] For example, the patent application with publication number CN201346027 discloses a chair that can be easily disassembled and folded without tools, especially a chair structure with foldable legs. It includes a chair backrest, a chair seat, and a chair leg frame on the left and right. The left and right sides of the chair backrest are symmetrically fixed with plugs; the head of each chair leg frame has a plug, and the plug can be tightly inserted into the plug; there is a crossbar on each chair leg frame, and the chair seat is movably connected to the crossbar. The above-mentioned folding chair structure can realize the folding function of the chair through a simple plug-in and pull-out action. Without any tools, the chair backrest and chair seat frame can be easily folded, thereby reducing space occupation and saving storage and transportation costs. Although the chair can better reduce space occupation, there are too many parts that need to be assembled, which is troublesome for users to assemble, especially users with poor hands-on ability.

[0005] In addition, for chairs used in office places, users sit for a long time, and the permeability of the user's buttocks and back is required to be higher. For example, the patent application with the publication number CN201509912U discloses a mesh chair, which includes chair legs, a chair frame, a seat and a chair back arranged in sequence from bottom to top. The seat includes a seat frame and a mesh cloth, and the mesh cloth is tightly installed on the upper edge of the seat frame. The chair back includes a back frame and a mesh cloth, and the mesh cloth is tightly installed on the periphery of the back frame. The two sides of the seat frame are hollowed out with staggered support rods. The mesh cloth has the characteristics of good air permeability and good elasticity. When people sit and lean on the mesh chair, the mesh cloth deforms with the weight of the human body's buttocks and back, and it is comfortable to use. After using it for a certain period of time, you only need to use a cleaning tool to wash the mesh cloth to achieve the purpose of cleaning the mesh cloth, which is convenient to clean. The staggered support rods hollowed out on both sides of the seat frame can increase the support force of the seat frame on the one hand, so that the force range of the seat frame is larger, and on the other hand, it can reduce the weight of the seat frame, so that the weight of the mesh chair is lighter. The chair keeps the mesh in a taut state, so the tension of the mesh increases sharply when the user sits down. After long-term use, the mesh is prone to reduced tension, partial relaxation, and damage at the connection between the edge of the mesh and the seat. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an adjustable chair frame mechanism and a chair, which are easy to assemble and easy to adjust the tension of the seat surface.

[0007] The present invention is achieved through the following technical solutions.

[0008] An adjustable chair frame mechanism includes two chair frames arranged at intervals on the left and right, and at least one adjustment mechanism; the adjustment mechanism includes a first support seat and a second support seat respectively supported on the two chair frames, a first adjustment tube arranged on the first support seat, and a second adjustment tube arranged on the second support seat; the first adjustment tube and the second adjustment tube extend left and right, and the two are in a socket relationship and the socket length is adjustable.

[0009] As a further improvement of the present invention, the first adjusting tube is sleeved on the second adjusting tube, or the second adjusting tube is sleeved on the first adjusting tube; the first adjusting tube and the second adjusting tube are threadedly matched; the first adjusting tube is movably connected to the first supporting seat and can rotate around its own axis.

[0010] As a further improvement of the present invention, the first adjusting tube is sleeved on the second adjusting tube, a rotating shaft is passed through the tube wall of the first adjusting tube, a part of the rotating shaft located in the first adjusting tube is fixedly sleeved with a gear, and the second adjusting tube is provided with a rack meshing with the gear; or, the second adjusting tube is sleeved on the first adjusting tube, a rotating shaft is passed through the tube wall of the second adjusting tube, a part of the rotating shaft located in the second adjusting tube is fixedly sleeved with a gear, and the first adjusting tube is provided with a rack meshing with the gear; the first adjusting tube is fixedly connected to the first support seat.

[0011] As a further improvement of the present invention, the second adjusting tube is fixedly connected to the second supporting seat.

[0012] As a further improvement of the present invention, the second support seat is provided with an adjustment cylinder extending left and right, the second adjustment tube penetrates into the adjustment cylinder and can slide left and right; an elastic reset structure for resetting the adjustment cylinder and the second adjustment tube is provided between the adjustment cylinder and the second adjustment tube.

[0013] As a further improvement of the present invention, a partition structure penetrated by the second adjusting tube is provided in the adjusting cylinder, a sleeve structure is provided on the tube body of the second adjusting tube, and the elastic reset structure is supported between the partition structure and the sleeve structure.

[0014] A chair comprises an adjustable chair frame structure, a chair foot frame, and a base mechanism connected to the chair foot frame; the two chair frames are detachably connected to the left and right ends of the base mechanism respectively.

[0015] As a further improvement of the present invention, the base mechanism includes a base and two adjustment seats that are detachably connected to corresponding chair frames; the two adjustment seats are rotatably connected to the left and right ends of the base respectively, and the rotation axes of both extend along the front-to-back direction.

[0016] As a further improvement of the present invention, the first support seat and the second support seat are both rotatably connected to the corresponding chair frames, and the rotation axes of the two support seats extend along the front-rear direction.

[0017] As a further improvement of the present invention, the first support seat and the second support seat are both detachable from the corresponding chair frames.

[0018] Beneficial effects of the present invention:

[0019] By adjusting the sleeve length of the first adjusting tube and the second adjusting tube, the seat surface layer can be tensioned to facilitate the assembly of the chair frame mechanism; by setting the elastic reset member and the adjusting cylinder, the tension of the seat surface layer can be dynamically adjusted, allowing the user to move around more comfortably. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0021] Figure 1 This is a schematic diagram of the structure of the chair frame mechanism of implementation case 1;

[0022] Figure 2 This is a schematic diagram of the structure of the regulating mechanism for implementation case 1;

[0023] Figure 3 This is a schematic diagram of the structure of the adjustment mechanism for implementation case 2;

[0024] Figure 4 It is a cross-sectional schematic diagram of the first regulating tube and the second regulating tube of implementation case 2;

[0025] Figure 5 This is a schematic diagram of the structure of the adjustment mechanism for implementation case 3;

[0026] Figure 6 It is a schematic diagram of the structure of the regulating mechanism of implementation case 4;

[0027] Figure 7 It is a cross-sectional schematic diagram of the second regulating tube and regulating cylinder of Example 4;

[0028] Figure 8 This is a schematic diagram of the structure of the chair in implementation case 5;

[0029] Fig. 9 This is a schematic diagram of the structure of the chair in implementation case 5 after the seat surface layer is removed;

[0030] Fig.10 This is a schematic diagram of the structure of the chair frame of implementation case 5;

[0031] Fig.11 This is a schematic diagram of the explosion of the chair frame of implementation case 5;

[0032] Fig.12 It is a schematic diagram of the structure of the skeleton of implementation case 5;

[0033] Fig.13 This is a schematic diagram of the structure of the connection frame for implementation case 5;

[0034] Fig.14 It is a structural diagram of the base structure of implementation case 5;

[0035] Fig.15 This is an exploded schematic diagram of the base mechanism of implementation case 5;

[0036] Fig.16 This is a schematic diagram of the rotation of the adjustment seat during the loading process of Example 5;

[0037] Fig.17Schematic diagram of the rotation of the adjustment seat during the left and right movement of the chair in Example 5. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below based on the accompanying drawings and implementation examples.

[0039] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0040] Implementation Case 1:

[0041] Reference Figure 1 , Figure 2 , an adjustable chair frame mechanism, including two chair frames 1 arranged at intervals on the left and right, and at least one adjustment mechanism 5.

[0042] The adjustment mechanism 5 comprises a first support seat 53 and a second support seat 54 respectively supported on the two chair frames 1, a first adjustment tube 51 arranged on the first support seat 53, and a second adjustment tube 52 arranged on the second support seat 54. The first adjustment tube 51 and the second adjustment tube 52 extend left and right, and are in a sleeve-connected relationship. In this embodiment, the first adjustment tube 51 is sleeved on the second adjustment tube 52, or the second adjustment tube 52 is sleeved on the first adjustment tube 51.

[0043] The first adjusting tube 51 is movably connected to the first supporting seat 53, and the first adjusting tube 51 can rotate around its own axis, and the first adjusting tube 51 and the second adjusting tube 52 are threadedly matched. The rotation of the first adjusting tube 51 can make the second adjusting tube 52 slide left and right relative to the first adjusting tube 51, that is, the sleeve length of the first adjusting tube 51 and the second adjusting tube 52 can be adjusted, so that the left and right distance between the first supporting seat 53 and the second supporting seat 54 can be adjusted.

[0044] In addition, for the convenience of adjustment, the first adjustment tube 51 is provided with a rotating sleeve handle 511 .

[0045] Implementation Case 2:

[0046] Reference Figure 3 , Figure 4 , an adjustable chair frame mechanism, except for the structural relationship between the first adjustment tube 51 and the second adjustment tube 52, the rest of the implementation case 1 is the same.

[0047] In this embodiment, the first adjusting tube 51 is fixedly connected to the first supporting seat 53, and the first adjusting tube 51 is sleeved on the second adjusting tube 52. The tube wall of the first adjusting tube 51 is penetrated with a rotating shaft 512, and the part of the rotating shaft 512 located outside the first adjusting tube 51 is provided with a rotating handle 513, and the part of the rotating shaft 512 located inside the first adjusting tube 51 is fixedly sleeved with a gear 514, and the part of the second adjusting tube 52 located inside the first adjusting tube 51 is provided with a rack 521, and the gear 514 and the rack 521 are meshed. The gear 514 can be driven to rotate by rotating the rotating handle 513, so that the transmission rack 521 drives the second adjusting tube 52 to slide left and right, that is, the sleeve length of the first adjusting tube 51 and the second adjusting tube 52 can be adjusted.

[0048] Of course, the second adjusting tube 52 may be sleeved on the first adjusting tube 51 , and the settings of the gear 514 and the rack 521 may be adjusted accordingly, which will not be described in detail here.

[0049] Implementation Case 3:

[0050] Reference Figure 5 , an adjustable chair frame mechanism, except for the structural relationship between the second adjustment tube 52 and the second support seat 54, the rest is the same as implementation case 1 or implementation case 2.

[0051] In this embodiment, the second adjustment tube 52 is fixedly connected to the second support seat 54. Therefore, the distance between the first support seat 53 and the second support seat 54 can only be adjusted manually by the user (rotating the rotating sleeve handle 511 of embodiment 1 or rotating the rotating handle 513 of embodiment 2).

[0052] Implementation Case 4:

[0053] Reference Figure 6 , Figure 7 , an adjustable chair frame mechanism, except for the structural relationship between the second adjustment tube 52 and the second support seat 54, the rest is the same as implementation case 1 or implementation case 2.

[0054] In this embodiment, the second support seat 54 is provided with an adjustment tube 55 extending left and right, and a partition structure 551 is provided in the middle of the adjustment tube 55. The partition structure 551 divides the adjustment tube 55 into two cylinders. The second adjustment tube 52 passes through the partition structure 551, penetrates into the cylinder of the adjustment tube 55 close to the second support seat 54, and can slide left and back. The shaft of the second adjustment tube 52 is provided with a sleeve structure 522, the diameter of the sleeve structure 522 is larger than the second adjustment tube 52, and the tube body of the second adjustment tube 52 is covered with an elastic reset structure 523, and the elastic reset structure 523 is preferably a reset spring. The elastic reset structure 523 is supported between the partition structure 551 and the sleeve structure 522, respectively, and the elastic reset structure 523 is used for resetting the adjustment tube 55 and the second adjustment tube 52. In addition, the sleeve structure 522 and the elastic reset structure 523 are both located in the cylinder of the adjustment tube 55 away from the second support seat 54, so as to play a protective role.

[0055] In this embodiment, the second adjustment tube 52 slides left and right relative to the adjustment tube 55, and maintains dynamic balance under the elastic force applied by the elastic reset structure 523, so that the tension of the seat surface layer 2 can be dynamically adjusted. In addition, by rotating the rotating sleeve handle 511 of embodiment 1 or rotating the rotating handle 513 of embodiment 2, the initial elastic force of the elastic reset structure 523 can be adjusted to meet the personalized needs of users.

[0056] Implementation Case 5:

[0057] A chair includes the chair frame mechanism of implementation case 3 or 4, and also includes a chair surface layer 2 fixed by two chair frames 1 and spread apart to the left and right, a chair foot frame 4, and a base mechanism 3 connected to the chair foot frame 4.

[0058] The chair frame includes a seat frame 11 extending substantially forward and backward, a back frame 12 extending substantially upward and downward, a connecting frame 13 connecting the rear end of the seat frame 11 and the bottom end of the back frame 12, and a frame 14. It should be noted that the seat frame 11 and the back frame 12 are not linear structures, but present a certain curvature based on ergonomics, but the overall extension direction of the two is forward and backward, and upward and downward.

[0059] The chair surface layer 2 is a surface structure with a certain degree of stretchability and can be tensioned. It can support the user's buttocks and the user's back. It is preferably made of mesh fabric, which has the characteristics of good air permeability, high friction and softness. It has excellent air permeability and resilience while ensuring load-bearing capacity.

[0060] The seat surface layer 2 includes a seat surface layer 21 fixed by the two seat seat frames 11 and spread out to the left and right, and a seat back layer 22 fixed by the two seat back frames 12 and spread out to the left and right.

[0061] The connecting frame 13 is made of elastic material, such as rubber, silicone, natural rubber and other rubber materials, and has strong performance of bending deformation under pressure and rebounding to restore the original shape. The frame 14 is made of rigid material, such as metal parts such as stainless steel, and has high structural strength. The connecting piece presents an arc-shaped segment structure, which naturally transitions the front-to-back extension direction of the seat frame 11 to the up-and-down extension direction of the seat back frame 12.

[0062] When the connecting frame 13 is not equipped with the frame 14, it can be bent and deformed so that the chair back frame 12 can be flipped forward, so that the chair back frame 12 and the seat frame 11 are folded and folded, so that the chair can compress the space occupied vertically, thereby increasing the cabinet loading capacity. When the frame 14 is assembled on the connecting frame 13, that is, after the chair is assembled, the frame 14 can support the connecting frame 13 so that the connecting frame 13 can maintain its original shape without deformation, so that the chair frame 1 becomes a firm and stable structure.

[0063] The seat frame 11 and the back frame 12 as the supporting body of the chair frame 1 need to have a certain rigidity, so that the chair frame 1 becomes a foldable structure that is soft and elastic only at its bending parts. Compared with other mechanical structures such as joints and hinges, it has fewer components and a simpler overall structure, so it is not easy to have mechanical failures, and the production cost is relatively lower.

[0064] Furthermore, one surface of the connecting frame 13 has a mounting groove 131 that is recessed inward and extends along the extending direction of the connecting frame 13, and the skeleton 14 is embedded in the mounting groove 131. The mounting groove 131 is preferably arranged on the inner side of the connecting frame 13, which can prevent the skeleton 14 from being exposed to the outside and affecting the appearance, and can also reduce the probability of the skeleton 14 being damaged by external environment such as collision. The skeleton 14 is an arc-shaped sheet structure in terms of structural shape. Of course, since the connecting frame 13 is made of elastic material and the skeleton 14 is made of rigid material, the skeleton 14 is slightly larger than the mounting groove 131 in size, so that the skeleton 14 is embedded in the mounting groove 131 with interference fit to prevent the skeleton 14 from loosening in the mounting groove 131. In addition, the width of the skeleton 14 and the mounting groove 131 should be increased as much as possible, so that the skeleton 14 has better supporting performance.

[0065] In order to further improve the structural strength and stability of the chair frame 1 after assembly, one surface of the seat frame 11 and the seat back frame 12 has an extension groove 132 connected to the mounting groove 131. Obviously, the surface where the extension groove 132 is located is also the inner side of the seat frame 11 and the seat back frame 12. The two ends of the frame 14 are respectively embedded in the corresponding extension grooves 132. Similarly, the frame 14 is slightly larger than the extension groove 132 in size.

[0066] The two ends of the frame 14 are detachably connected to the seat frame 11 and the back frame 12. Compared with the elastic material connecting frame 13, the frame 14 and the seat frame 11 and the back frame 12 are fixedly connected, which has better connection stability. The detachable connection method also facilitates the disassembly and installation of the chair frame 1. More specifically, the frame 14 and the seat frame 11 and the back frame 12 are fixedly connected using multiple fasteners.

[0067] In order to increase the shear stress load on the connecting frame 13 and improve the structural strength of the connecting frame 13 in the inner and outer width directions, the bottom of the installation groove 131 has at least one reinforcing groove 133 that is recessed inward and extends along the extension direction of the installation groove 131, and the surface of the frame 14 that is attached to the bottom of the installation groove 131 has a reinforcing structure 141 inserted into the reinforcing groove 133. More specifically, two reinforcing grooves 133 are provided at the intersection of the bottom of the installation groove 131 and the two groove walls, and correspondingly, the reinforcing structures 141 that are folded are provided on both sides of the frame 14.

[0068] The connecting frame 13 has a plurality of partition grooves 134 arranged at intervals along its extension direction, and the partition grooves 134 form notches at least on the inner curved surface of the connecting frame 13. In the present embodiment, the partition grooves 134 form notches on the inner side surface and the top surface (inner curved surface). During the gradual folding of the connecting member, the width of the partition grooves 134 will be continuously compressed, which plays a buffering role, thereby preventing the irreversible deformation damage caused by excessive local squeezing of the connecting frame 13 when the seat frame 11 and the back frame 12 are folded. At the same time, the partition grooves 134 can also make the connecting frame 13 easier to bend, which is more labor-saving when folding. The number, spacing, and width of the partition grooves 134 are determined according to the actual application.

[0069] Although the connecting frame 13 can be supported by the skeleton 14, and the connecting piece can be well connected to the seat frame 11 and the back frame 12, it is still easy to be misaligned between the two ends of the connecting frame 13 and the rear end of the seat frame 11 and the bottom end of the back frame 12. Therefore, a connecting piece 15 is provided between the two ends of the connecting frame 13 and the rear end of the seat frame 11 / the bottom end of the back frame 12, which is used to connect the two ends of the connecting piece and the rear end of the seat frame 11 / the bottom end of the back frame 12. Due to the characteristics of the connecting piece being made of elastic material, a part of the connecting piece 15 is embedded in the connecting frame 13, and the other part is fixed to the seat frame 11 / the back frame 12. The part of the connecting piece 15 embedded in the connecting frame 13 plays a role similar to the skeleton 14, supporting the end of the connecting frame 13, while the other part of the connecting piece 15 is fixedly connected to the seat frame 11 / the back frame 12, which can improve the connection stability.

[0070] More specifically, the connector 15 includes a first connector part 151 and a second connector part 152. Both the first part and the second connector part 152 are plate-like structures, and the two are in an angled relationship and are connected as one. The connector 15 is the same as the frame 14 and is also made of a rigid material. The bottom of the mounting groove 131 has an inwardly recessed embedding groove 135 near both ends. The first connector part 151 is embedded in the embedding groove 135. The first connector part 151 is also slightly larger than the embedding groove 135 in size, so that the first connector part 151 is not easy to loosen in the embedding groove 135. The second connector part 152 fits on the bottom of the mounting groove 131 and the extension groove 132. The frame 14 fits on the second connector part 152, so that the second connector part 152 is clamped between the bottom of the mounting groove 131 and the extension groove 132 and the frame 14, and the second connector part 152 and the extension groove 132 are fixed together. First, the connector 15 not only serves to connect the end of the connector and the rear end of the seat frame 11 / the bottom end of the backrest frame 12, but the first part 151 of the connector inserted in the embedding groove 135 can further increase the shear stress load on both ends of the connector; and the second part 152 of the connector is clamped between the bottom of the installation groove 131, the extension groove 132 and the frame 14 to improve the firmness of the connector on the seat frame 11 / backrest frame 12. In addition, the second part 152 of the connector and the extension groove 132 are also detachably fixedly connected using multiple fasteners.

[0071] The two chair seat frames 11 are detachably connected to the left and right ends of the base mechanism 3. When used in a cabinet, the two chair seat frames 11 can be compressed and folded left and right, and the seat surface layer 2 is also folded up at the same time, so that the chair can compress the space occupied horizontally.

[0072] By compressing the space that chairs can occupy in both horizontal and vertical directions, the loading capacity of chairs can be greatly increased, saving logistics and transportation costs.

[0073] It should be noted that, in order to prevent the seat surface layer 21 from collapsing directly when the user sits, the seat surface layer 21 is in a tensioned state after the chair is assembled, that is, the seat surface layer 21 is stretched to a certain extent to the left and right, so as to stably support the user's buttocks. However, when the seat surface layer 21 is naturally stretched to the left and right, the left and right spacing of the two seat frames 11 is smaller than the left and right spacing after the chair is assembled, which will cause a certain size deviation during installation, that is, the seat frame 11 and the base mechanism 3 need to be connected and installed in the state of stretching the seat surface layer 21 to the left and right. It is difficult for the user to maintain the seat surface layer 21 stretched during assembly without the help of tools, and it is also difficult to control the stretching range, which makes it difficult to align the seat frame 11 and the base mechanism 3.

[0074] Based on this technical problem, the base mechanism 3 includes a base 31, two adjustment seats 32 detachably connected to the corresponding seat frames 11, the two adjustment seats 32 are rotatably connected to the left and right ends of the base 31, and the rotation axes of the two extend along the front-to-back direction. The two adjustment seats 32 can be rotated in opposite directions to change the left-right spacing of the two seat frames 11. When the two adjustment seats 32 are flipped upward relative to the base 31 at the same time, the left-right spacing at the two ends of the base mechanism 3 can be reduced.

[0075] During assembly, the user can ignore whether the seat surface layer 21 is stretched, and first fix the two seat frames 11 to the corresponding adjustment seats 32 respectively, and then increase the left-right distance between the two seat frames 11 by operating the adjustment mechanism 5 .

[0076] If the adjustment mechanism 5 of implementation example 3 is used, the distance between the two chair frames 1 will not change after manual adjustment, and the tension of the seat surface layer 2 will not change.

[0077] If the adjustment mechanism 5 of implementation example 4 is used, the distance between the two chair frames 1 is in a dynamic equilibrium state after the user sits down, and the tension of the seat surface layer 2 is also dynamically adjusted.

[0078] Due to the rotational connection between the adjustment seat 32 and the base 31, the chair frame 1 rotates relative to the base 31, so the first support seat 53 and the second support seat 54 are rotationally connected to the corresponding chair frame 1, and similarly, the rotation axes of the first support seat 53 and the second support seat 54 extend along the front-to-back direction. In addition, considering the convenience of disassembly and cabinet installation, the first support seat 53, the second support seat 54 and the corresponding chair frame 1 are in a detachable relationship.

[0079] After the two adjustment seats 32 are flipped downward relative to the base 31 until the three are flush with each other, if they continue to flip downward, the left-right distance between the two chair frames 11 will be reduced. Therefore, the base 31 and the adjustment seat 32 respectively have a first limiting structure 311 and a second limiting structure 321 that can block each other, which are used to limit the maximum threshold of the left-right distance between the two chair frames 1. Therefore, the adjustment range of the adjustment mechanism 5 for the left-right distance between the two chair frames 1 is also limited by this.

[0080] Due to the self-weight of the seat frame 11 and the adjustment seat 32, in the absence of external forces, the adjustment seat 32 and the base 31 can be stably maintained in a state where the first limiting structure 311 and the second limiting structure 321 block each other. In addition, when the first limiting structure 311 and the second limiting structure 321 block each other, the adjustment seat 32 and the base 31 can be set to be flush, or the adjustment seat 32 can be set to be slightly tilted upward relative to the base 31.

[0081] The seat frame 11 and the adjustment seat 32 are respectively provided with a slot 111 and an insertion structure 322. The insertion structure 322 is inserted in the slot 111 to limit the relative position of the seat frame 11 and the adjustment seat 32. The seat frame 11 and the adjustment seat 32 are detachably connected using multiple fasteners. During assembly, the insertion structure 322 of the adjustment seat 32 is first inserted into the slot 111 of the seat frame 11, and then connected using fasteners, so as to facilitate finding the connection and installation position.

[0082] Since the position of the adjustment seat 32 is adjusted by rotation, it is difficult to ensure that the insertion structure 322 is completely aligned with the slot 111. Therefore, a gap is provided between the insertion structure 322 and the slot 111 to facilitate insertion, but it is easy to cause looseness between the two. Therefore, the adjustment seat 32 has a blocking structure 323, which abuts against the side of the seat frame 11 close to the base 31 to prevent the seat frame 11 and the adjustment seat 32 from moving relative to each other. Moreover, a groove is also formed between the insertion structure 322 and the blocking structure 323, so that the seat frame 11 and the adjustment seat 32 can be inserted into each other.

[0083] It should be noted that when using the adjustment mechanism 5 of implementation case 3, although the tension of the seat surface layer 2 cannot be changed, thereby improving the support for the user's buttocks, for users with heavier weight, when the user sits on the seat surface 21 quickly, the degree of tension surge will be aggravated, and this situation may easily cause irreversible tensile damage to the seat surface 21, shortening its service life, and easily causing damage to the edge of the seat surface 21 fixed to the seat frame 11.

[0084] When the adjustment mechanism 5 of implementation case 4 is used, due to the rotational connection between the adjustment seat 32 and the base 31, when the seat surface layer 2 is compressed, the sudden increase in the tension of the seat surface layer 21 will exert a force on the seat frame 11, so that the adjustment seat 32 will flip upward relative to the base 31, shortening the left and right distance between the two seat frames 11, thereby reducing the degree of the sudden increase in the tension of the seat surface layer 21, and playing a certain buffering role, which can reduce the damage to the seat surface layer 21 to extend its service life, and at the same time can also have a certain elastic buffer, reduce the stiffness of the user sitting on the seat surface layer 21, and improve the comfort.

[0085] The two adjustment seats 32 rotate in opposite directions (i.e., the two adjustment seats 32 flip up or flip down relative to the base 31 at the same time) so that the left-right spacing between the two chair frames 1 changes, and the two adjustment seats 32 rotate in the same direction (i.e., one adjustment seat 32 flips up relative to the base 31, and the other adjustment seat 32 flips down relative to the base 31) so that the left-right tilt range of the two seat surface layers 2 changes. When the user sits on the seat surface layer 21 and tilts the body to the left or right, the two adjustment seats 32 rotate in the same direction, so that the chair has the function of swinging left and right. Correspondingly, the first limiting structure 311 and the second limiting structure 321 that block each other can also be used to limit the maximum angle of the adjustment seat 32 flipping downward relative to the base 31, that is, to limit the maximum range of swinging left and right.

[0086] A first elastic reset member 3-1 is provided between the base 31 and the adjustment seat 32. The first elastic reset member 3-1 is used to drive the adjustment seat 32 to rotate and reset. Preferably, a spring is used. When the user stands up or sits upright, the auxiliary seat surface layer 21 and the base layer quickly return to a horizontal state.

[0087] A lumbar support 6 is provided between the two chair back frames 12 at a position corresponding to the user's waist. The left and right ends of the lumbar support 6 are respectively connected to the corresponding chair back frames 12, and can support the chair back layer 22. When the user's back is fully supported on the chair back layer 22, it can provide better support for the waist, meet ergonomic requirements, and improve comfort.

[0088] The base 31 is rotatably connected to the top of the chair leg frame 4, and its rotation axis extends in the left-right direction, so that the chair has the function of swinging forward and backward, and the two functions of swinging forward and backward and swinging left and right are independent of each other and do not interfere with each other. A second elastic reset member 3-2 is provided between the base 31 and the top of the chair leg frame 4, which is used to drive the base 31 to rotate and reset, and the second elastic reset member 3-2 is also preferably a spring.

[0089] An adjustment mechanism 5 is disposed between at least two seat seat frames 11 and in front of the base mechanism 3 , and an adjustment mechanism 5 may also be disposed between two seat back frames 12 .

[0090] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned implementation cases, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A chair, characterized in that: It includes an adjustable chair frame structure, a chair foot frame, and a base mechanism connected to the chair foot frame; the two chair frames are detachably connected to the left and right ends of the base mechanism respectively; the adjustable chair frame mechanism includes two chair frames arranged at intervals on the left and right, and at least one adjustment mechanism; the adjustment mechanism includes a first support seat and a second support seat respectively supported on the two chair frames, a first adjustment tube arranged on the first support seat, and a second adjustment tube arranged on the second support seat; the first adjustment tube and the second adjustment tube extend left and right, and the two are in a sleeve relationship and the sleeve length is adjustable; the base mechanism includes a base, two adjustment seats detachably connected to the corresponding chair frames, the base and the adjustment seat respectively have a first limiting structure and a second limiting structure that can block each other, which are used to limit the maximum threshold of the left and right spacing between the two chair frames; the two adjustment seats are rotatably connected to the left and right ends of the base respectively, and the rotation axes of the two extend along the front-to-back direction; the two adjustment seats rotate in opposite directions to change the left and right spacing between the two chair frames, and the two adjustment seats rotate in the same direction to change the left and right inclination amplitudes of the two seat surface layers.

2. The chair according to claim 1, characterized in that: The first support seat and the second support seat are both rotatably connected to the corresponding chair frames, and the rotation axes of the two support seats extend along the front-rear direction.

3. The chair according to claim 1, characterized in that: The first support seat and the second support seat are both detachable from the corresponding chair frames.

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