Folding chair

Abstract

The utility model belongs to the technical field of chairs, in particular to a folding chair, which comprises a chair frame and a cushion part arranged on the chair frame, the chair frame can be folded, backrest support rods are symmetrically arranged on the chair frame, each backrest support rod comprises a connecting rod and an adjusting rod movably connected with the connecting rod, a cushion connecting part is arranged on the adjusting rod, and the cushion connecting part is connected with the connecting rod. The seat cushion connecting part is connected with one end of the seat cushion part, the adjusting rod can move up and down relative to the connecting rod, a locking assembly is arranged on the adjusting rod, the locking assembly is connected with the connecting rod in a clamped mode, so that up-down movement of the adjusting rod is limited, the clamping state of the locking assembly and the adjusting rod is relieved, and at the moment, the adjusting rod can move up and down. The folding chair is simple in structure, the overall height of the folded chair can be reduced, the size of the chair can be reduced to the maximum extent, and the chair is convenient to store and carry when people go out.

Description

Technical Field

[0001] The utility model belongs to the technical field of chairs, in particular to a folding chair. Background Art

[0002] As people's living standards continue to improve, more and more people like to go out for an outing, and play in parks or the wild. They need outdoor chairs that are easy to carry and can be placed stably on the ground, such as moon chairs. The chairs on the market now include two major parts: a seat frame and a seat cushion. In order to make users use this chair more comfortably, a support rod for supporting the seat cushion is provided on the seat frame, but the height of the support rod is often higher than the overall height of the seat frame, so that the user's back can lean on the seat cushion of the support rod when sitting on the chair. The seat frames on the market now can basically be folded for the convenience of users to carry out, but due to the support rod, when the seat frame is folded, the support rod is higher than the seat frame, so that the overall height of the chair is still high, and the volume of the chair cannot be reduced to the greatest extent, which is not conducive to the storage and carrying of the chair. Summary of the invention

[0003] The utility model aims to provide a foldable chair with a simple structure and capable of reducing the overall height of the chair after folding, so that the volume of the chair can be reduced to the greatest extent, which is conducive to the storage and carrying of the chair.

[0004] The purpose of the utility model is achieved in this way:

[0005] A foldable chair comprises a chair frame and a seat cushion portion arranged on the chair frame, the chair frame being foldable, and the chair frame being symmetrically provided with backrest support rods, each of the backrest support rods comprising a connecting rod and an adjusting rod movably connected to the connecting rod, the adjusting rod being provided with a seat cushion connecting portion, the seat cushion connecting portion being connected to one end of the seat cushion portion, the adjusting rod being movable up and down relative to the connecting rod, the adjusting rod being provided with a locking assembly, the locking assembly being engaged with the connecting rod, thereby limiting the upward and downward movement of the adjusting rod, and the engaging state of the locking assembly and the adjusting rod being released, at which time the adjusting rod can move up and down.

[0006] Furthermore, the connecting rod is hollow to form an installation space, one end of the adjusting rod is arranged in the installation space, the locking assembly is arranged in the adjusting rod, the locking assembly includes an elastic member and a locking member arranged on the elastic member, the adjusting rod and the connecting rod are respectively provided with a pressing hole and a locking hole, the outer end of the locking member passes through the pressing hole and the locking hole to be exposed outside the connecting rod and is clamped with the connecting rod.

[0007] Furthermore, the number of the locking holes is at least three, and the three locking holes are adjacently opened on the connecting rod.

[0008] Furthermore, the elastic member includes a first elastic sheet and a second elastic sheet, the first elastic sheet and the second elastic sheet are in a "V" shape, and the inner end of the locking member is fixedly connected to the first elastic sheet.

[0009] Furthermore, the chair frame includes a symmetrically arranged front support foot, a rear support foot and a symmetrically arranged left support foot and right support foot, the front support foot, the rear support foot, the left support foot and the right support foot all include a first support rod and a second support rod, the middle part of the first support rod is hinged to the middle part of the second support rod, the two ends of the first support rod are hinged to the adjacent second support rod, the first support rod in the left support foot and the second support rod in the right support foot are both movably provided with a connecting sleeve, the connecting sleeve can slide along the first support rod or the second support rod, the bottom ends of the symmetrical backrest support rods are respectively hinged to the connecting sleeve on the first support rod and the connecting sleeve on the second support rod, the connecting sleeves are each provided with a limiting assembly, the limiting assembly is clamped with the first support rod and the second support rod, thereby limiting the sliding of the connecting sleeve, pressing the limiting assembly can release the clamping state of the limiting assembly and the first support rod or the second support rod, and at this time the connecting sleeve can slide.

[0010] Furthermore, the connecting sleeve is provided with an installation groove, the limit assembly is arranged in the installation groove, the limit assembly includes a clamping column and a push switch, the push switch is rotatably arranged in the installation groove, the clamping column is connected to the push switch, the bottom of the installation groove is provided with a through hole, the first support rod in the left supporting foot and the second support rod in the right supporting foot are provided with a plurality of clamping holes, the clamping column is arranged in the first support rod or the second support rod through the through hole and the clamping hole and is clamped with the first support rod or the second support rod.

[0011] Furthermore, a hinge hole is provided at the middle end of the push switch, mounting holes are provided on the inner walls on both sides of the mounting groove, mounting rods are provided at the mounting holes and the hinge holes, the clamping column is provided at the front end of the push switch, a spring column is provided at the rear end of the push switch, a groove is provided at the bottom of the mounting groove, a return spring is provided in the mounting groove, one end of the return spring is sleeved on the spring column, and the other end of the return spring is provided in the groove.

[0012] Furthermore, the connecting sleeves are symmetrically formed with hinge plates, the bottom end of the backrest support rod is arranged between the symmetrical hinge plates, the hinge plates are provided with plate holes, the bottom end of the backrest support rod is provided with a rod hole, and a rotating shaft is provided in the rod hole and the plate hole.

[0013] Furthermore, the first support rod is connected to the adjacent second support rod via a hinge seat, and both ends of the first support rod and the second support rod are respectively hinged to the hinge seats, wherein the two hinge seats above the two connecting sleeves are respectively sleeved on the symmetrical backrest support rods.

[0014] Furthermore, a first connecting member is provided on the cushion connecting part of the adjustment rod, and a second connecting member is provided at the top end of the first support rod and the second support rod in the front supporting foot, and both ends of the cushion part are respectively connected to the first connecting member and the second connecting member.

[0015] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0016] A foldable chair comprises a chair frame and a seat cushion portion arranged on the chair frame, the chair frame can be folded, the chair frame is also symmetrically provided with backrest support rods, the backrest support rods each comprise a connecting rod and an adjusting rod movably connected to the connecting rod, the adjusting rod is provided with a seat cushion connecting portion, the seat cushion connecting portion is connected to one end of the seat cushion portion, the adjusting rod can move up and down relative to the connecting rod, the adjusting rod is provided with a locking assembly, the locking assembly is engaged with the connecting rod, thereby limiting the upward and downward movement of the adjusting rod, and the engaging state of the locking assembly and the adjusting rod is released, at which time the adjusting rod can move up and down The chair frame is a common foldable chair frame on the market, which enables the chair to be folded, which is convenient for storage and carrying out, and the cushion connection part on the adjusting rod is connected to the cushion part, and the setting of the cushion part enables the user to sit on the chair normally, and the user can lean his back on the cushion part of the adjusting rod, which makes the user feel more comfortable and increases the user experience. Compared with the folding chairs on the market, in order to enable the user to lean his back on the cushion cloth of the support rod when sitting on the chair, the height of the support rod is often higher than the overall height of the seat frame. When the seat frame is folded, After the backrest is completed, the support rod is higher than the seat frame, so the overall height of the chair is still too high, which cannot reduce the volume of the chair to the greatest extent, and is not conducive to the storage and carrying of the chair. The number of backrest support rods of the utility model is two, so that the user's back is more stable when leaning on the cushion part between the backrest support rods, and the backrest support rod is composed of a connecting rod and an adjusting rod movably connected to the connecting rod, so that the adjusting rod can move up and down relative to the connecting rod to change the overall height of the backrest support rod, and the locking assembly on the adjusting rod is clamped with the connecting rod, thereby limiting the upward and downward movement of the adjusting rod, so that the adjusting rod cannot be arbitrarily The up and down movements will not affect the user's normal use of the chair. When the user has finished using the folding chair, the chair frame will be folded first. When the chair frame is folded, the height of the backrest support rod is higher than the height of the folded chair frame. The user can press the locking assembly to release the locking device and the connecting rod. At this time, the adjusting rod can move downward relative to the connecting rod to retract, so that the overall height of the backrest support rod is reduced to the same height as the folded chair frame, thereby reducing the overall height of the chair after folding, and minimizing the volume of the chair, which is convenient for users to carry and store the chair when going out. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a stereogram of the utility model.

[0018] Figure 2 It is a stereogram of the utility model.

[0019] Figure 3 It is a structural schematic diagram of a chair frame and a backrest support rod of the utility model.

[0020] Figure 4 It is an exploded view of the chair frame and the backrest support rod of the utility model.

[0021] Figure 5 It is a three-dimensional diagram of the backrest support rod of the utility model.

[0022] Figure 6 yes Figure 5 A partial enlarged view of point D in the middle.

[0023] Figure 7 It is a cross-sectional view of the backrest support rod of the utility model.

[0024] Figure 8 yes Figure 7 A partial enlarged view of point C in the middle.

[0025] Fig. 9 It is an exploded view of the connecting rod and the adjusting rod of the utility model.

[0026] Fig.10 yes Fig. 9 A partial enlarged view of point A in the middle.

[0027] Fig.11 It is a stereogram of the adjusting rod of the utility model.

[0028] Fig.12 yes Fig.11 A partial enlarged view of point B in the middle.

[0029] Fig.13 It is a stereoscopic diagram of the utility model in which the connecting sleeve is respectively installed on the first support rod and the second support rod.

[0030] Fig.14 It is a cross-sectional view of the connecting sleeve and the first supporting rod of the utility model.

[0031] Fig.15 yes Fig.14 A partial enlarged view of point E in the middle.

[0032] Fig.16 It is an exploded view of the connecting sleeve and the first support rod of the utility model.

[0033] Fig.17 It is a stereogram of the connecting sleeve of the utility model.

[0034] Fig.18It is one of the exploded views of the connecting sleeve and the limiting assembly of the utility model.

[0035] Fig.19 This is the second exploded view of the connecting sleeve and the limiting assembly of the utility model.

[0036] Fig. 20 It is a reference diagram of the state of the utility model after being folded.

[0037] Fig.21 This is a reference diagram of the state after the length of the backrest support rod of the utility model is adjusted.

[0038] Fig. 22 This is a reference diagram of the state after the angle of the backrest support rod of the utility model is adjusted.

[0039] The meaning of the symbols in the figure:

[0040] 1-chair frame; 2-seat cushion; 3-backrest support rod; 4-connecting rod; 5-adjusting rod;

[0041] 6-installation space; 7-elastic member; 8-locking member; 9-pressing hole; 10-locking hole;

[0042] 11-first elastic sheet; 12-second elastic sheet; 13-front supporting foot; 14-rear supporting foot;

[0043] 15-left supporting foot; 16-right supporting foot; 17-first supporting rod; 18-second supporting rod;

[0044] 19-connecting sleeve; 20-installation slot; 21-clamping column; 22-press switch; 23-perforation;

[0045] 24-card hole; 25-hinge hole; 26-mounting hole; 27-spring column; 28-groove;

[0046] 29-reset spring; 30-hinge plate; 31-plate hole; 32-rod hole; 33-hinge seat;

[0047] 34-first connecting member; 35-second connecting member. DETAILED DESCRIPTION

[0048] The present invention is further described below in conjunction with specific embodiments:

[0049] A foldable chair comprises a chair frame 1 and a cushion portion 2 arranged on the chair frame 1, wherein the chair frame 1 can be folded, and the chair frame 1 is also symmetrically provided with backrest support rods 3, each of which comprises a connecting rod 4 and an adjusting rod 5 movably connected to the connecting rod 4, wherein the adjusting rod 5 is provided with a cushion connecting portion, wherein the cushion connecting portion is connected to one end of the cushion portion 2, and the adjusting rod 5 can move up and down relative to the connecting rod 4, and wherein the adjusting rod 5 is provided with a locking assembly, wherein the locking assembly is engaged with the connecting rod 4, thereby limiting the upward and downward movement of the adjusting rod 5, and releasing the engaging state of the locking assembly with the adjusting rod 5, at which time the adjusting rod 5 is The adjusting rod 5 can be moved up and down; the chair frame 1 is a common foldable chair frame 1 on the market, which enables the chair to be folded, which is convenient for storage and carrying out of the chair, and the cushion connecting part on the adjusting rod 5 is connected to the cushion part 2, and the setting of the cushion part 2 enables the user to sit on the chair normally, and the user can lean his back on the cushion part 2 of the adjusting rod 5, making the user feel more comfortable and enhancing the user's using experience. Compared with the folding chairs currently on the market, in order to enable the user's back to lean on the cushion cloth of the support rod when sitting on the chair, the height of the support rod is often higher than the overall height of the seat frame. When the seat frame is folded, After folding, the support rods are higher than the seat frame, so that the overall height of the chair is still high, which cannot reduce the volume of the chair to the greatest extent, which is not conducive to the storage and carrying of the chair. The number of backrest support rods 3 of the utility model is two, so that the user's back is more stable when leaning on the cushion part 2 between the backrest support rods 3, and the backrest support rod 3 is composed of a connecting rod 4 and an adjusting rod 5 movably connected to the connecting rod 4, so that the adjusting rod 5 can move up and down relative to the connecting rod 4 to change the overall height of the backrest support rod 3, and the locking assembly on the adjusting rod 5 is clamped with the connecting rod 4, thereby limiting the upward and downward movement of the adjusting rod 5, so that the adjusting rod 5 cannot It can be moved up and down at will without affecting the user's normal use of the chair. When the user finishes using the folding chair, the chair frame 1 is folded first. When the chair frame 1 is folded, the height of the backrest support rod 3 is higher than the height of the folded chair frame 1. The user can press the locking assembly to release the locking device and the connecting rod 4. At this time, the adjusting rod 5 can move downward relative to the connecting rod 4 to retract, so that the overall height of the backrest support rod 3 is reduced to the same height as the folded chair frame 1, thereby reducing the overall height of the chair after folding, so that the volume of the chair can be minimized, which is beneficial for users to carry and store the chair when going out.

[0050] Preferably, the connecting rod 4 is hollow to form an installation space 6, one end of the adjusting rod 5 is arranged in the installation space 6, the locking assembly is arranged in the adjusting rod 5, the locking assembly includes an elastic member 7 and a locking member 8 arranged on the elastic member 7, the adjusting rod 5 and the connecting rod 4 are respectively provided with a pressing hole 9 and a locking hole 10, the outer end of the locking member 8 passes through the pressing hole 9 and the locking hole 10 to be exposed outside the connecting rod 4 and is engaged with the connecting rod 4; because the locking assembly includes the elastic member 7 and the locking member 8, and the locking assembly is arranged in the adjusting rod 5, one end of the adjusting rod 5 is arranged in the installation space 6 of the connecting rod 4, the pressing hole 9 on the adjusting rod 5 and the locking hole 10 on the connecting rod 4, the outer end of the locking member 8 in the adjusting rod 5 can smoothly pass through the pressing hole 9 and the locking hole 10 to be arranged outside the connecting rod 4, at this time, the locking member 8 and the connecting rod 4 are in an engaged state, so that the adjusting rod 5 cannot move up and down in the installation space 6 of the connecting rod 4, and when the user wants to adjust the entire backrest support rod 3 When the height of the chair body is lowered, the outer end of the locking piece 8 is pressed to move the locking piece 8 inwardly and release the engaging state with the connecting rod 4, and the user can pull the adjusting rod 5 to move downwardly. The structure is simple, fast and convenient. After the adjusting rod 5 moves downwardly, the outer end of the locking piece 8 will contact the inner wall of the installation space 6. When the user wants to pull it out from the adjusting rod 5 when using the chair, since the inner end of the locking piece 8 abuts against the elastic piece 7, the elastic piece 7 will be compressed during the inward movement of the locking piece 8, and the outer end of the locking piece 8 will contact the inner wall of the installation space 6. At this time, after the user pulls the adjusting rod 5 upwardly for a certain distance, when the outer end of the locking piece 8 reaches the locking hole 10 on the connecting rod 4, the compressed elastic piece 7 will push the locking piece 8 to move outwardly, so that the outer end of the locking piece 8 passes through the locking hole 10 again and is exposed outside the connecting rod 4, so that the locking piece 8 and the connecting rod 4 re-enter the engaging state. When the user uses the chair, the adjusting rod 5 will not automatically move downward, and will not affect the normal use of the chair by the user.

[0051] Preferably, the number of the locking holes 10 is at least three, and the three locking holes 10 are adjacently opened on the connecting rod 4; the number of the locking holes 10 can be set according to the actual needs of the user. When the number of the locking holes 10 is three, the three locking holes 10 are adjacently opened on the connecting rod 4 from high to low. Since the outer ends of the locking members 8 enter into different locking holes 10, the overall heights between the connecting rod 4 and the adjusting rod 5 are different. When a tall user sits on the chair, the back cannot be completely leaned against the seat between the symmetrical backrest support rods 3. When on the cushion part 2, the user can release the engagement state with the connecting rod 4 by pressing the locking piece 8. At this time, after pulling the adjusting rod 5 upward for a certain distance, the locking piece 8 is exposed from the connecting rod 4 through the higher locking hole 10 on the connecting rod 4, and re-engaged with the connecting rod 4. At this time, the overall height of the backrest support rod 3 is also increased, so that the user's back can be completely leaned on the cushion part 2, increasing the user's comfort. The setting of the three locking holes 10 enables the user to adjust the height of the backrest support rod 3 according to their actual needs, thereby increasing the practicality of the chair.

[0052] Preferably, the elastic member 7 includes a first elastic sheet 11 and a second elastic sheet 12, the first elastic sheet 11 and the second elastic sheet 12 are in a "V" shape, and the inner end of the locking member 8 is fixedly connected to the first elastic sheet 11; the elastic member 7 and the locking member 8 are composed of the "V"-shaped marbles commonly seen on the market, and the elastic member 7 is composed of the first elastic sheet 11 and the second elastic sheet 12, the elastic member 7 is installed in the adjusting rod 5, the top ends of the first elastic sheet 11 and the second elastic sheet 12 are in contact with the inner wall of the adjusting rod 5, and the bottom ends of the first elastic sheet 11 and the second elastic sheet 12 are connected. Since the inner end of the locking member 8 is fixedly connected to the first elastic sheet 11, the locking member 8 can be prevented from being separated from the locking hole 10 and the pressing hole 9.

[0053] Preferably, the chair frame 1 includes a symmetrically arranged front support foot 13, a rear support foot 14, and a symmetrically arranged left support foot 15 and a right support foot 16, the front support foot 13, the rear support foot 14, the left support foot 15 and the right support foot 16 all include a first support rod 17 and a second support rod 18, the middle part of the first support rod 17 and the middle part of the second support rod 18 are hinged, the two ends of the first support rod 17 are hinged to the adjacent second support rod 18, the first support rod 17 in the left support foot 15 and the second support rod 18 in the right support foot 16 are both movably sleeved with a connecting sleeve 19, the connecting sleeve 19 can slide along the first support rod 17 or the second support rod 18, the bottom ends of the symmetrical backrest support rods 3 are respectively connected to the first support rod 17 The connecting sleeve 19 and the connecting sleeve 19 on the second support rod 18 are hinged, and a limiting assembly is provided on the connecting sleeve 19, and the limiting assembly is clamped with the first support rod 17 and the second support rod 18, so as to limit the sliding of the connecting sleeve 19. Pressing the limiting assembly can release the clamping state of the limiting assembly and the first support rod 17 or the second support rod 18, and the connecting sleeve 19 can slide at this time; since the chair frame 1 includes a front supporting foot 13, a rear supporting foot 14, a left supporting foot 15 and a right supporting foot 16, and the front supporting foot 13, the rear supporting foot 14, the left supporting foot 15 and the right supporting foot 16 are all composed of the first support rod 17 and the second support rod 18, the middle parts of the first support rod 17 and the second support rod 18 are hinged, and the adjacent first support rods 17 and the second support rods 18 are hinged. The two ends of 18 are hinged, so that the chair frame 1 can be folded smoothly, and the first support rod 17 in the left support foot 15 and the second support rod 18 in the right support foot 16 are movably sleeved with a connecting sleeve 19, and the connecting sleeve 19 can slide along the first support rod 17 or the second support rod 18, and the bottom ends of the two backrest support rods 3 are respectively hinged with the two connecting sleeves 19. When the connecting sleeves 19 slide, the backrest support rod 3 will rotate relative to the connecting sleeves 19. At this time, the angle between the backrest support rod 3 and the chair frame 1 is changed. Since the two connecting sleeves 19 are respectively clamped with the first support rod 17 and the second support rod 18 through the limiting assembly, the situation in which the connecting sleeve 19 slides arbitrarily on the first support rod 17 or the second support rod 18 is limited. When the connecting sleeve 19 cannot slide, the angle between the back support rod 3 and the chair frame 1 will not change. When the user leans his back against the cushion part 2 between the two back support rods 3, the back support rod 3 will not rotate backwards, so that the user can use the chair normally and more safely. When the user wants to adjust the angle of the back support rod 3, he can press the limit assembly to release the engagement between the limit assembly and the first support rod 17 or the second support rod 18. At this time, the user adjusts the angle of the back support rod 3, increasing the practicality of the chair. After the angle adjustment of the back support rod 3 is completed, the limit assembly will be re-engaged with the first support rod 17 and the second support rod 18, so that the back support rod 3 cannot rotate, and the user can use the chair normally.

[0054] Preferably, the connecting sleeve 19 is provided with a mounting groove 20, the limiting assembly is arranged in the mounting groove 20, the limiting assembly includes a clamping column 21 and a push switch 22, the push switch 22 is rotatably arranged in the mounting groove 20, the clamping column 21 is connected to the push switch 22, a through hole 23 is provided at the bottom of the mounting groove 20, a plurality of clamping holes 24 are provided on the first support rod 17 in the left support foot 15 and the second support rod 18 in the right support foot 16, the clamping column 21 is arranged on the first support rod 17 through the through hole 23 and the clamping hole 24 or the second support rod 18 is snapped with the first support rod 17 or the second support rod 18; the setting of the mounting groove 20 on the connecting sleeve 19 enables the limit assembly to be smoothly installed on the connecting sleeve 19, and the limit assembly includes a snap-on column 21 and a push switch 22, and the push switch 22 is rotatably set in the mounting groove 20. When the snap-on column 21 passes through the through hole 23 at the bottom of the mounting groove 20 and the snap-on hole 24 of the first support rod 17 or the second support rod 18, the snap-on column 21 will be snapped with the first support rod 17 or the second support rod 18. At this time, the first support rod 17 and the second support rod 18 are snapped. The connecting sleeve 19 on the backrest cannot slide along the first support rod 17 and the second support rod 18, and the user can choose the number of the clamping holes 24 according to their actual needs. The number of the clamping holes 24 of the utility model is three. Since the first support rod 17 and the second support rod 18 are both inclined, the heights of the three clamping holes 24 on the first support rod 17 and the second support rod 18 from the ground are different. When the clamping column 21 enters the higher clamping hole 24, the angle between the backrest support rod 3 and the chair frame 1 is larger. When the user wants to adjust the backrest support When the angle of the support rod 3 is adjusted, the push switch 22 is first pressed to make the push switch 22 drive the clamping column 21 to disengage the clamping hole 24. At this time, the two connecting sleeves 19 can slide along the first support rod 17 and the second support rod 18 respectively. When the connecting sleeve 19 slides to a certain position, the through hole 23 at the bottom of the installation groove 20 will coincide with the position of the new clamping hole 24. At this time, the clamping column 21 can enter the new clamping hole 24 and re-enter the clamping state with the first support rod 17 or the second support rod 18, so that the backrest support rod 3 cannot be rotated, and the user can use the chair normally.

[0055] Preferably, a hinge hole 25 is provided at the middle end of the push switch 22, and mounting holes 26 are provided on the inner walls on both sides of the mounting groove 20. The mounting holes 26 and the hinge holes 25 are provided with mounting rods. The clamping column 21 is provided at the front end of the push switch 22, and a spring column 27 is also provided at the rear end of the push switch 22. A groove 28 is also provided at the bottom of the mounting groove 20. A return spring 29 is provided in the mounting groove 20, and one end of the return spring 29 is sleeved on the spring column 27, and the other end of the return spring 29 is arranged in the groove 28. The push switch 22 is rotatably installed in the mounting groove 20 by passing through the hinge hole 25 at the middle end of the push switch 22 and the mounting holes 26 on the inner walls on both sides of the mounting groove 20 through the mounting rod, so that the push switch 22 can rotate smoothly and will not fall out of the mounting groove 20. One end of the return spring 29 in the mounting groove 20 is sleeved on the spring column 27 of the push switch 22, and the return spring 29 is reset. The other end of the spring 29 is arranged in the groove 28 at the bottom of the mounting groove 20, and the clamping column 21 is arranged at the front end of the push switch 22, and the spring column 27 is arranged at the rear end of the push switch 22. When the user presses the rear end of the push switch 22, the return spring 29 will enter a compressed state, and the front end of the push switch 22 will smoothly tilt up, so that the clamping column 21 at the front end of the push switch 22 will be separated from the clamping hole 24. At this time, the two connecting sleeves 19 can slide along the first support rod 17 and the second support rod 18 respectively. When the connecting sleeve 19 slides to the corresponding position, the through hole 23 at the bottom of the mounting groove 20 will coincide with the position of the new clamping hole 24. At this time, the compressed return spring 29 will push the rear end of the push switch 22 to reset, so that the clamping column 21 at the front end of the push switch 22 can automatically re-enter the new clamping hole 24, which is convenient for users to adjust the angle between the backrest support rod 3 and the chair frame 1.

[0056] Preferably, the connecting sleeves 19 are symmetrically formed with hinge plates 30, the bottom ends of the backrest support rods 3 are arranged between the symmetrical hinge plates 30, the hinge plates 30 are provided with plate holes 31, the bottom ends of the backrest support rods 3 are provided with rod holes 32, and the rod holes 32 and the plate holes 31 are provided with rotating shafts; the backrest support rods 3 are rotatably connected to the hinge plates 30 through the rotating shaft passing through the rod holes 32 at the bottom ends of the backrest support rods 3 and the plate holes 31 on the hinge plates 30, so that the backrest support rods 3 can be smoothly rotated relative to the connecting sleeves 19, and the rotational connection between the backrest support rods 3 and the connecting sleeves 19 is more stable and firm.

[0057] Preferably, the first support rod 17 is connected to the adjacent second support rod 18 via a hinge seat 33, and the two ends of the first support rod 17 and the second support rod 18 are respectively hinged to the hinge seat 33, wherein the two hinge seats 33 above the two connecting sleeves 19 are respectively sleeved on the symmetrical backrest support rods 3; the setting of the hinge seat 33 enables the adjacent first support rod 17 and the second support rod 18 to be smoothly rotated and connected together through the hinge seat 33, and the two hinge seats 33 are respectively sleeved on the two backrest support rods 3, so that the backrest support rod 3 has better support, and the overall firmness and fixity of the chair are also better.

[0058] Preferably, a first connecting member 34 is provided on the seat cushion connecting portion of the adjusting rod 5, and a second connecting member 35 is provided at the top end of the first support rod 17 and the second support rod 18 in the front supporting foot 13, and the two ends of the seat cushion portion 2 are respectively connected to the first connecting member 34 and the second connecting member 35; the setting of the first connecting member 34 and the second connecting member 35 makes the seat cushion portion 2 more stably and firmly installed on the chair frame 1, and when the backrest support rod 3 adjusts the height or angle, it can drive the seat cushion portion 2 to be adjusted together.

[0059] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A foldable chair, comprising a chair frame (1) and a cushion portion (2) arranged on the chair frame (1), characterized in that: The chair frame (1) can be folded, and the chair frame (1) is also symmetrically provided with backrest support rods (3), and the backrest support rods (3) include connecting rods (4) and adjusting rods (5) movably connected to the connecting rods (4), and the adjusting rods (5) are provided with a cushion connecting part, and the cushion connecting part is connected to one end of the cushion part (2), and the adjusting rod (5) can move up and down relative to the connecting rod (4). The adjusting rod (5) is provided with a locking assembly, and the locking assembly is engaged with the connecting rod (4), so as to limit the upward and downward movement of the adjusting rod (5), and the engaging state between the locking assembly and the adjusting rod (5) is released, and the adjusting rod (5) can move up and down at this time.

2. A foldable chair according to claim 1, characterized in that: The connecting rod (4) is hollow to form an installation space (6), one end of the adjusting rod (5) is arranged in the installation space (6), the locking assembly is arranged in the adjusting rod (5), and the locking assembly includes an elastic member (7) and a locking member (8) arranged on the elastic member (7). The adjusting rod (5) and the connecting rod (4) are respectively provided with a pressing hole (9) and a locking hole (10), and the outer end of the locking member (8) passes through the pressing hole (9) and the locking hole (10) to be exposed outside the connecting rod (4) and is clamped with the connecting rod (4).

3. A foldable chair according to claim 2, characterized in that: The number of the locking holes (10) is at least three, and the three locking holes (10) are adjacently arranged on the connecting rod (4).

4. A foldable chair according to claim 2, characterized in that: The elastic member (7) comprises a first elastic piece (11) and a second elastic piece (12), the first elastic piece (11) and the second elastic piece (12) are in a "V" shape, and the inner end of the locking member (8) is fixedly connected to the first elastic piece (11).

5. A foldable chair according to any one of claims 1-2, characterized in that: The chair frame (1) comprises a symmetrically arranged front support leg (13), a rear support leg (14) and a symmetrically arranged left support leg (15) and right support leg (16); the front support leg (13), the rear support leg (14), the left support leg (15) and the right support leg (16) all comprise a first support rod (17) and a second support rod (18); the middle portion of the first support rod (17) and the middle portion of the second support rod (18) are hingedly connected; the two ends of the first support rod (17) are hingedly connected to the adjacent second support rod (18); the first support rod (17) in the left support leg (15) and the second support rod (18) in the right support leg (16) are both movable The sleeve is provided with a connecting sleeve (19), and the connecting sleeve (19) can slide along the first support rod (17) or the second support rod (18). The bottom ends of the symmetrical backrest support rods (3) are respectively hinged with the connecting sleeve (19) on the first support rod (17) and the connecting sleeve (19) on the second support rod (18). The connecting sleeves (19) are provided with limiting components, and the limiting components are clamped with the first support rod (17) and the second support rod (18), so as to limit the sliding of the connecting sleeve (19). Pressing the limiting components can release the clamping state of the limiting components and the first support rod (17) or the second support rod (18), and the connecting sleeve (19) can slide at this time.

6. A foldable chair according to claim 5, characterized in that: The connecting sleeve (19) is provided with a mounting groove (20), the limiting assembly is arranged in the mounting groove (20), the limiting assembly comprises a clamping column (21) and a push switch (22), the push switch (22) is rotatably arranged in the mounting groove (20), the clamping column (21) is connected to the push switch (22), a through hole (23) is provided at the bottom of the mounting groove (20), the first support rod (17) in the left support foot (15) and the second support rod (18) in the right support foot (16) are provided with a plurality of clamping holes (24), the clamping column (21) passes through the through hole (23) and the clamping hole (24) and is arranged in the first support rod (17) or the second support rod (18) to be clamped with the first support rod (17) or the second support rod (18).

7. A foldable chair according to claim 6, characterized in that: A hinge hole (25) is provided at the middle end of the push switch (22), and mounting holes (26) are provided on the inner walls of both sides of the mounting groove (20). The mounting holes (26) and the hinge holes (25) are provided with mounting rods. The clamping column (21) is arranged at the front end of the push switch (22), and a spring column (27) is also provided at the rear end of the push switch (22). A groove (28) is also provided at the bottom of the mounting groove (20), and a return spring (29) is provided in the mounting groove (20), one end of the return spring (29) is sleeved on the spring column (27), and the other end of the return spring (29) is arranged in the groove (28).

8. The foldable chair according to claim 5, characterized in that: The connecting sleeves (19) are symmetrically formed with hinge plates (30), the bottom ends of the backrest support rods (3) are arranged between the symmetrical hinge plates (30), the hinge plates (30) are provided with plate holes (31), the bottom ends of the backrest support rods (3) are provided with rod holes (32), and the rod holes (32) and the plate holes (31) are provided with rotation shafts.

9. The foldable chair according to claim 5, characterized in that: The first support rod (17) is connected to the adjacent second support rod (18) via a hinge seat (33), and the two ends of the first support rod (17) and the second support rod (18) are respectively hinged to the hinge seat (33), wherein the two hinge seats (33) above the two connecting sleeves (19) are respectively sleeved on the symmetrical backrest support rods (3).

10. The foldable chair according to claim 5, characterized in that: A first connecting member (34) is provided on the cushion connecting portion of the adjusting rod (5), a second connecting member (35) is provided at the top end of the first supporting rod (17) and the second supporting rod (18) in the front supporting foot (13), and two ends of the cushion portion (2) are respectively connected to the first connecting member (34) and the second connecting member (35).

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