CN210748185U

CN210748185U - Folding chair with adjustable height

Info

Publication number: CN210748185U
Application number: CN201921025966.5U
Authority: CN
Inventors: 周晓峰
Original assignee: Foshan Shijing Tourism Products Co ltd
Current assignee: Foshan Shijing Tourism Products Co ltd
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2020-06-16
Anticipated expiration: 2029-07-03

Abstract

The utility model discloses a folding chair with adjustable height, wherein the lower end of a backrest is hinged with the rear end of a chair seat, and the rear ends of armrests are hinged with the middle part of the backrest; the middle parts of the front legs are hinged with the middle parts of the side edges of the seat, and the upper ends of the front legs are connected with the armrests through the backrest adjusting devices; the upper ends of the rear legs are hinged with the rear end of the chair seat; the front legs and the rear legs are both tubular structures; the height adjusting device comprises a movable rod and a clamping assembly; the lower extreme of preceding leg with the lower extreme of back leg is equipped with respectively high adjusting device, the movable rod telescopically set up in the preceding leg the inside of back leg, clamping component fixed set up in the preceding leg the lower extreme of back leg, clamping component is pressing from both sides tightly and is unclamping change between the movable rod. The utility model discloses a but each preceding leg and back leg height-adjusting alone, it is applicable in complicated topography.

Description

Folding chair with adjustable height

Technical Field

The utility model relates to an outdoor tourism articles for use field especially relates to a folding chair of adjustable height.

Background

With the development of society, people often need to go out to camp on vacation in idle life after work, and the folding chair is the necessary equipment for camping vacation, and the folding chair can form a smaller storage space through folding, and is convenient to carry. However, since the length of the four legs of the existing folding chair cannot be independently adjusted, the folding chair cannot adapt to complicated terrains, and the folding chair cannot be stably placed on uneven ground.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a height-adjustable's folding chair to solve above-mentioned problem.

To achieve the purpose, the utility model adopts the following technical proposal:

a folding chair with adjustable height comprises a backrest, a chair seat, armrests, front legs, rear legs, a height adjusting device and a backrest adjusting device;

the lower end of the backrest is hinged with the rear end of the seat, and the rear end of the armrest is hinged with the middle of the backrest;

the middle parts of the front legs are hinged with the middle parts of the side edges of the seat, and the upper ends of the front legs are connected with the armrests through the backrest adjusting devices;

the upper ends of the rear legs are hinged with the rear end of the chair seat;

the front legs and the rear legs are both tubular structures;

the height adjusting device comprises a movable rod and a clamping assembly; the lower extreme of preceding leg with the lower extreme of back leg is equipped with respectively high adjusting device, the movable rod telescopically set up in the preceding leg the inside of back leg, clamping component fixed set up in the preceding leg the lower extreme of back leg, clamping component is pressing from both sides tightly and is unclamping change between the movable rod.

The device also comprises a first cross bar and a second cross bar; the lower ends of the front legs are connected with the first cross rod, and the near ends of the lower ends of the rear legs are connected with the second cross rod;

the clamping assembly comprises an L-shaped plate, a movable plate, an adjusting rod and a first elastic element;

the L-shaped plate is connected to the lower ends of the front legs/the rear legs in an inverted mode, one end of the movable plate is hinged to the lower end of the side face of the L-shaped plate, a locking hole is formed in the middle of the movable plate, the diameter of the locking hole is larger than that of the movable rod, and the lower end of the movable rod penetrates through the locking hole; the other end of the movable plate is hinged with the end part of the adjusting rod;

the first elastic element is connected between the adjusting rod and the first cross rod/the second cross rod, and the first elastic element tensions the adjusting rod towards the direction of the first cross rod/the second cross rod; when the first elastic element pulls up the adjusting rod, the other end of the movable plate rotates upwards, and the locking hole in the movable plate clamps the movable rod; when the adjusting rod is pressed down, the other end of the movable plate rotates downwards, and the locking hole in the movable plate loosens the movable rod.

And the outer wall of the movable rod is provided with transverse anti-slip lines.

The backrest adjusting device comprises a front foot seat, a handrail chute piece, a rack, a unidirectional rotating assembly and a positioning assembly;

the front foot seat is H-shaped, the upper end of the front foot seat is an adjusting part, and the lower end of the front foot seat is a connecting part; the connecting part is hinged with the upper end of the front leg; the adjusting part is provided with adjusting holes which penetrate through two side walls of the adjusting part;

the handrail sliding groove piece is in a shape of a Chinese character 'men', the top of the handrail sliding groove piece is fixed on the lower surface of the handrail, long sliding grooves are respectively arranged on two side walls of the handrail sliding groove piece, and the two long sliding grooves are oppositely arranged; the two side walls of the handrail sliding groove piece are positioned at the inner sides of the two side walls of the adjusting part of the front foot seat, and the long sliding groove is aligned with the adjusting hole;

the rack is arranged on the inner side of the upper wall of the handrail chute piece, and one side of the teeth of the rack faces downwards;

the positioning assembly penetrates through the adjusting hole and the long sliding groove and is fixed in the adjusting hole;

the unidirectional rotating assembly comprises a unidirectional bearing and a gear;

the gear is fixed on the outer side of an outer ring of the one-way bearing, and the one-way bearing is sleeved on the outer side of the positioning component;

the unidirectional rotating assembly is sleeved on the outer wall of the positioning assembly, the gear is meshed with the rack, the positioning assembly is clamped and loosened between the inner rings of the unidirectional bearing, and when the inner ring of the unidirectional bearing is clamped, the outer ring of the unidirectional bearing can rotate forwards in a unidirectional mode.

The inner ring of the one-way bearing is provided with a spline hole;

the positioning assembly comprises a pin shaft, a trigger and a second elastic element;

the pin shaft penetrates through the adjusting hole, trigger sliding grooves are formed in the two sides of the outer wall of the pin shaft along the length direction of the pin shaft, and a spring hole is formed in one end of the pin shaft;

the trigger is in a shape like a Chinese character 'ji', and the outer side of the tail part of the trigger is respectively provided with a first step and a second step matched with the spline hole; two sides of the trigger are respectively arranged in the trigger sliding groove in a sliding manner; the head of the trigger faces one end of the pin shaft;

the one-way bearing is sleeved on the pin shaft;

the second elastic element is compressed in the spring hole, one end of the second elastic element abuts against the bottom surface of the spring hole, and the other end of the second elastic element abuts against the trigger;

a positioning block is arranged in the adjusting hole at the other end of the pin shaft and clamped in the trigger sliding groove;

the second step is clamped in the spline hole, and the first step is abutted to one side, back to the spring hole, of the one-way bearing; when the trigger is pressed down, the first step is withdrawn from the spline hole, and the one-way bearing can rotate freely around the pin shaft.

The backrest adjusting device also comprises a roller sleeve and a roller, two side walls of the adjusting part are also provided with roller holes, two ends of the roller penetrate through the long sliding groove of the handrail sliding groove piece and are fixed in the roller holes, the roller sleeve is rotatably sleeved on the outer side of the roller, and the roller sleeve is positioned in the long sliding groove; the outer diameter of the roller is not smaller than the diameter of the pin shaft.

The positioning assembly further comprises a first clamp spring, a second clamp spring and a third clamp spring; the pin shaft is provided with a first positioning ring groove, a second positioning ring groove and a third positioning ring groove;

the first positioning ring groove and the second positioning ring groove are respectively positioned at the near ends of two ends of the pin shaft, the first clamp spring is clamped on the first positioning ring groove, the second clamp spring is clamped on the second positioning ring groove, and the first clamp spring and the second clamp spring axially fix the pin shaft in the adjusting hole;

and a limiting block is arranged on the side surface of the rack, the limiting block and the third positioning ring groove are respectively positioned on two sides of the one-way bearing, and the third clamp spring is clamped in the third positioning ring groove.

The chair seat and the backrest are of U-shaped structures, and the chair seat further comprises a chair surface, and the chair surface is wrapped on the chair seat and the backrest;

the backrest and the rear legs are respectively hinged with the seat through the hinge assemblies;

the hinge assembly comprises two hinge components and a sliding shaft which are mutually mirrored;

the hinge component comprises a fixing part and a hinge part, the hinge part is L-shaped, one end of the hinge part is connected with the fixing part, the extending direction of the other end of the hinge part is opposite to the extending direction of the fixing part, and the hinge part is obliquely provided with a hinge sliding groove;

the two hinge members are oppositely arranged, the fixed parts of the two hinge members are fixedly connected to the upper ends of the rear legs, a first hinge point is arranged at the near end of one end of the hinge part, the first hinge point is hinged with the near end of the rear end of the seat, and the near end of the other end of the hinge part is hinged with the lower end of the backrest;

the sliding shaft can be arranged in the hinge sliding groove in a sliding mode, when the folding chair is unfolded, the rear leg and the included angle between the chair seats are obtuse angles, and the sliding shaft slides to the uppermost end of the hinge sliding groove and abuts against the chair seats.

The chair seat is characterized by further comprising a connecting rod, one end of the connecting rod is hinged to the other end of the hinge, the other end of the connecting rod is hinged to the middle of the front leg, and the hinged point of the connecting rod and the front leg is located below the hinged point of the front leg and the chair seat.

The pillow also comprises an anti-skidding foot seat and a headrest, wherein the middle part of the anti-skidding foot seat is provided with a ball hole; the lower end of the movable rod is provided with a ball head, and the ball head is inserted into the ball hole;

the headrest comprises a hanging part, a pillow part and a fixing component, wherein the hanging part is in a shape of a Chinese character 'men', a long hole is formed in the lower end of the hanging part, the fixing component is in a U-shaped structure, the fixing component is fixed to the upper end of the backrest, a fixing shaft is arranged at an opening of the fixing component and is in sliding connection with the long hole, and the distance from the lowest end of the long hole to the lowest end of the hanging part is smaller than the distance from the fixing shaft to the backrest; the pillow part is fixed on the hanging part.

Drawings

The accompanying drawings are provided to further illustrate the present invention, but the content in the accompanying drawings does not constitute any limitation to the present invention.

FIG. 1 is a schematic view of a folding chair according to one embodiment of the present invention;

FIG. 2 is a schematic view of a portion of a folding chair according to one embodiment of the present invention;

FIG. 3 is a schematic view of a portion of a folding chair according to one embodiment of the present invention;

fig. 4 is a schematic structural view of a backrest adjustment assembly according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a backrest adjustment assembly according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of a unidirectional rotating assembly according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a hinge member according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a pin according to an embodiment of the present invention;

fig. 9 is a partially enlarged schematic view of one embodiment of the present invention;

in the drawing, the chair comprises a backrest 1, a seat 2, a handrail 3, a front leg 4, a rear leg 5, a height adjusting device 6, a movable rod 61, a ball head 611, a clamping assembly 62, a template 621-L, a movable plate 622, a locking hole 6221, an adjusting rod 623, a first elastic element 624, a backrest 7 adjusting device 71, a front foot rest 711, an adjusting part 7111, an adjusting hole 7112, a positioning block 7113, a roller hole 7113, a connecting part 712, a handrail sliding groove 72, a long sliding groove 721, a rack 73, a limiting block 731, a unidirectional rotating assembly 74, a unidirectional bearing 741, a spline hole 7411, a gear 742, a positioning assembly 75, a pin shaft 751-a pin shaft, a trigger chute 7511, a spring hole 7512, a first positioning ring groove 7514, a second positioning ring groove 7515, a third positioning ring groove 752-7521, a first step 22, a second step, a hinge joint part 7512, a spring hole 7513, a first positioning ring groove 2012, a second positioning groove 7514, a second positioning ring groove, a hinge groove 201, a hinge groove 510-a hinge joint part 401-20, a hinge joint part 401-a hinge joint part 510-a hinge joint part 401-5, a hinge joint part 401-5-a hinge joint part, a hinge joint part 401-5-hinge joint part, a hinge joint part and a hinge part.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

A folding chair with adjustable height of the present embodiment, as shown in fig. 1 and 3, includes a backrest 1, a seat 2, armrests 3, front legs 4, rear legs 5, a height adjusting device 6 and a backrest adjusting device 7;

the lower end of the backrest 1 is hinged with the rear end of the seat 2, and the rear ends of the armrests 3 are hinged with the middle part of the backrest 1;

the middle parts of the front legs 4 are hinged with the middle parts of the side edges of the seat 2, and the upper ends of the front legs 4 are connected with the armrests 3 through the backrest adjusting device 7;

the upper ends of the rear legs 5 are hinged with the rear end of the chair seat 2;

the front legs 4 and the rear legs 5 are both tubular structures;

the height adjusting device 6 comprises a movable rod 61 and a clamping assembly 62; the lower extreme of preceding leg 4 with the lower extreme of back leg 5 is equipped with respectively height-adjusting device 6, movable rod 61 telescopically set up in preceding leg 4 the inside of back leg 5, clamping component 62 fixed set up in preceding leg 4 the lower extreme of back leg 5, clamping component 62 is pressing from both sides tightly and is unclamping change between the movable rod 61.

The folding chair is characterized in that each front leg 4 and each rear leg 5 are respectively provided with a movable rod 61, when the height of the front leg 4/the rear leg 5 of the folding chair needs to be adjusted, the clamping assembly 62 can be loosened, the movable rods 61 can freely stretch out and draw back in the front leg 4/the rear leg 5 at the moment, each front leg 4 and each rear leg 5 of the folding chair can independently adjust the height of the folding chair, and the folding chair can be used in complex terrains; by adjusting the height of each of the front legs 4 and the rear legs 5, the folding chair can be stably placed in a relatively complex terrain, is not prone to toppling, and is more suitable and safer for people to sit on the folding chair.

The device also comprises a first cross bar 8 and a second cross bar 9; the lower ends of the front legs 4 are connected with the first cross rod 8, and the near ends of the lower ends of the rear legs 5 are connected with the second cross rod 9;

the clamping assembly 62 comprises an L-shaped plate 621, a movable plate 622, an adjusting rod 623 and a first elastic element 624;

the L-shaped plate 621 is connected to the lower ends of the front legs 4/the rear legs 5 in an inverted manner, one end of the movable plate 622 is hinged to the lower end of the side surface of the L-shaped plate 621, a locking hole 6221 is formed in the middle of the movable plate 622, the diameter of the locking hole 6221 is larger than that of the movable rod 61, and the lower end of the movable rod 61 penetrates through the locking hole 6221; the other end of the movable plate 622 is hinged with the end of the adjusting rod 623;

the first elastic element 624 is connected between the adjusting lever 623 and the first cross bar 8/the second cross bar 9, and the first elastic element 624 pulls the adjusting lever 623 in the direction of the first cross bar 8/the second cross bar 9; when the first elastic element 624 pulls up the adjusting rod 623, the other end of the movable plate 622 rotates upwards, and the locking hole 6221 on the movable plate 622 clamps the movable rod 61; when the adjustment lever 623 is pressed, the other end of the movable plate 622 rotates downward, and the locking hole 6221 of the movable plate 622 releases the movable lever 61.

When the adjusting lever 623 is pressed down, the adjusting lever 623 drives the two movable plates 622 of the front leg 4/the rear leg 5 to simultaneously rotate downwards, and during the downward rotation of the movable plates 622, the projection of the locking hole 6221 in the axial direction of the movable rod 61 gradually becomes larger until the locking hole 6221 releases the movable rod 61, and at this time, the movable rod 61 in the front leg 4/the rear leg 5 is extended under the action of gravity; when the movable rod 61 is adjusted to the right position, the adjusting rod 623 is released, the adjusting rod 623 returns upwards under the elastic action of the first elastic element 624, the projection of the locking hole 6221 in the axial direction of the movable rod 61 becomes smaller gradually, the locking hole 6221 clamps the movable rod 61 obliquely, the movable rod 61 cannot stretch or contract under the resistance of the locking hole 6221, and the movable rod 61 is locked. The arrangement of the adjusting rod 623 can simultaneously adjust the extending height of the movable rod 61 in the two front legs 4/the two rear legs 5, so that the adjusting efficiency is higher and the use is more convenient.

And the outer wall of the movable rod 61 is provided with transverse anti-slip lines.

The transverse anti-slip lines arranged on the outer wall of the movable rod 61 can obviously increase the resistance of the locking hole 6221 when the movable rod 61 is locked, solve the problem that the locking force between the locking hole 6221 and the movable rod 61 is insufficient to cause the retraction of the movable rod 61, and ensure that the folding chair is safer when being taken.

As shown in fig. 1, 4, 5 and 6, the backrest adjusting device 7 includes a front foot seat 71, an armrest chute member 72, a rack 73, a unidirectional rotation assembly 74 and a positioning assembly 75;

the front foot seat 71 is H-shaped, the upper end of the front foot seat 71 is provided with an adjusting part 711, and the lower end of the front foot seat is provided with a connecting part 712; the connecting part 712 is hinged with the upper end of the front leg 4; the adjusting part 711 is provided with an adjusting hole 7111, and the adjusting hole 7111 penetrates through two side walls of the adjusting part 711;

the handrail sliding groove piece 72 is in a shape of a Chinese character 'men', the top of the handrail sliding groove piece 72 is fixed on the lower surface of the handrail 3, two side walls of the handrail sliding groove piece 72 are respectively provided with a long sliding groove 721, and the two long sliding grooves 721 are oppositely arranged; both side walls of the armrest slide groove member 72 are located inside both side walls of the adjustment part 711 of the front foot seat 71, and the long slide groove 721 is aligned with the adjustment hole 7111;

the rack 73 is arranged on the inner side of the upper wall of the handrail chute piece 72, and the toothed surface of the rack 73 faces downwards;

the positioning component 75 passes through the adjusting hole 7111 and the long chute 721, and the positioning component 75 is fixed in the adjusting hole 7111;

the unidirectional rotation assembly 74 includes a unidirectional bearing 741 and a gear 742;

the gear 742 is fixed on the outer side of an outer ring of the one-way bearing 741, and the one-way bearing 741 is sleeved on the outer side of the positioning component 75;

the unidirectional rotation assembly 74 is sleeved on an outer wall of the positioning assembly 75, the gear 742 is engaged with the rack 73, the positioning assembly 75 is changed between clamping and releasing an inner ring of the unidirectional bearing 741, and when the inner ring of the unidirectional bearing 741 is clamped, an outer ring of the unidirectional bearing 741 can rotate forward in a unidirectional manner.

When the inner ring of the one-way bearing 741 is clamped by the positioning component 75, the one-way bearing 741 cannot rotate backwards, when a user leans against the backrest 1, the backrest 1 pulls the armrest 3 to be stressed backwards, the armrest 3 drives the rack 73 to be clamped backwards on the gear 742, and therefore the backrest 1 is fixed; when a user needs to adjust the backrest 1 backwards, the positioning assembly 75 is only needed to be operated to loosen the one-way bearing 741, the one-way bearing 741 freely rotates around the positioning assembly 75, then the armrest 3 is pulled backwards, the armrest 3 drives the backrest 1 to rotate backwards, meanwhile, the armrest 3 drives the rack 73 to move backwards, the one-way bearing 741 also rotates backwards, when the backrest 1 is adjusted in place, the positioning assembly 75 is operated to clamp the one-way bearing 741, at the moment, the inner ring of the one-way bearing 741 is locked, the outer ring cannot rotate backwards, and the backrest 1 is positioned; when the backrest 1 needs to be adjusted forwards, the outer ring of the one-way bearing 741 can rotate forwards in one direction relative to the inner ring, so that the armrest 3 can be pulled directly without operating the positioning assembly 75; when the backrest 1 is adjusted to the right position, the outer ring of the one-way bearing 741 cannot rotate backward, so that the positioning assembly 75 does not need to be operated, and the rack 73 is locked by the one-way bearing 741.

The angle of the backrest 1 is adjusted by the meshing of the gear and the rack between the armrest chute piece 72 and the front foot seat 71, so that the angle of the backrest 1 can be adjusted at will without being limited by gears, and compared with the traditional gear setting mode, the armrest chute piece has more adjusting space, so that a user can easily adjust the backrest 1 to the most comfortable angle.

The inner ring of the one-way bearing 741 is provided with a spline hole 7411;

the positioning assembly 75 comprises a pin 751, a trigger 752 and a second elastic element 753;

the pin 751 is arranged in the adjusting hole 7111 in a penetrating mode, trigger sliding grooves 7511 are formed in the two sides of the outer wall of the pin 751 along the length direction of the pin, and a spring hole 7512 is formed in one end of the pin 751;

the trigger 752 is shaped like a Chinese character 'ji', and the outer side of the tail part of the trigger 752 is respectively provided with a first step 7521 and a second step 7522 matched with the spline hole 7411; two sides of the trigger 752 are slidably disposed in the trigger slide grooves 7511, respectively; the head of the trigger 752 faces one end of the pin 751;

the one-way bearing 741 is sleeved on the pin 751;

the second elastic member 753 is compressed in the spring hole 7512, one end of the second elastic member 753 abuts against the bottom surface of the spring hole 7512, and the other end of the second elastic member 753 abuts against the trigger 752;

a positioning block 7112 is arranged in an adjusting hole 7111 at the other end of the pin shaft 751, and the positioning block 7112 is clamped in the trigger sliding groove 7511;

the second step 7522 is snapped into the spline hole 7411, and the first step 7521 abuts against a side of the one-way bearing 741 facing away from the spring hole 7512; when the trigger 752 is pressed, the first step 7521 is withdrawn from the splined hole 7411, and the one-way bearing 741 can rotate freely around the pin 751.

The positioning block 7112 has a limiting effect on the pin 751, so that the pin 751 cannot rotate in the adjusting hole 7111; the second elastic element 753 pushes the trigger tightly so that the second step 7522 of the trigger snaps into the splined hole 7411 and the trigger is positioned in the slide groove of the trigger, so that the inner ring of the one-way bearing 741 is clamped and the angle of the backrest 1 cannot be adjusted backwards; when the trigger is pressed, the trigger overcomes the elastic force of the second elastic member 753 and slides inward along the trigger groove until the second step 7522 is withdrawn from the splined hole 7411, and at this time, the inner ring and the outer ring of the one-way bearing 741 rotate around the pin 751 at the same time, and the user can pull the armrest 3 to adjust the angle of the backrest 1 backward/forward.

The backrest adjusting device 7 further comprises a roller 76 and a roller 77, two side walls of the adjusting part 711 are further provided with roller holes 7113, two ends of the roller 77 penetrate through the long chute 721 of the handrail chute member 72 and are fixed in the roller holes 7113, the roller 76 is rotatably sleeved outside the roller 77, and the roller 76 is located in the long chute 721; the outer diameter of the roller 76 is not smaller than the diameter of the pin 751.

When the handrail 3 is pulled, the roller 76 rolls in the long sliding groove 721 around the roller 77, and the outer diameter of the roller 76 is not smaller than the diameter of the pin 751, so that the roller 76 can reduce the abrasion of the pin 751 caused by the long sliding groove 721 and can play a good role in protecting the pin 751.

The positioning assembly 75 further comprises a first snap spring 754, a second snap spring 755, and a third snap spring 756; as shown in fig. 8, a first positioning ring groove 7513, a second positioning ring groove 7514, and a third positioning ring groove 7515 are formed on the pin 751;

the first retaining ring groove 7513 and the second retaining ring groove 7514 are respectively located at the proximal ends of the two ends of the pin 751, the first snap spring 754 is clamped on the first retaining ring groove 7513, the second snap spring 755 is clamped on the second retaining ring groove 7514, and the first snap spring 754 and the second snap spring 755 axially fix the pin 751 in the adjusting hole 7111;

a limiting block 731 is arranged on the side surface of the rack 73, the limiting block 731 and the third positioning ring groove 7515 are respectively located on two sides of the one-way bearing 741, and the third snap spring 756 is clamped in the third positioning ring groove 7515.

The first clamp spring 754 and the second clamp spring 755 play a role in axially positioning the pin 751, and the first clamp spring 754, the second clamp spring 755 and the positioning block 7112 are matched to completely position the pin 751 in the adjusting hole 7111 of the front foot seat 71; the third clamp spring 756 and the limiting block 731 are respectively located on two sides of the one-way bearing 741, and limit the one-way bearing 741, so as to limit the movement of the one-way bearing 741 along the axial direction of the pin 751, and keep the gear 742 engaged with the rack 73 at all times.

The chair seat 2 and the backrest 1 are both of a U-shaped structure, and the chair seat further comprises a chair surface 10, and the chair surface 10 is wrapped on the chair seat 2 and the backrest 1;

the backrest 1 and the rear legs 5 are respectively hinged with the seat 2 through the hinge assemblies 20;

the hinge assembly 20 comprises two hinge members 201 and a sliding shaft 202 which are mirror images of each other;

the folding and hinging member 201 comprises a fixing part 2011 and a hinging part 2012, wherein the hinging part 2012 is in an L shape, one end of the hinging part 2012 is connected with the fixing part 2011, the extending direction of the other end of the hinging part 2012 is opposite to the extending direction of the fixing part 2011, and the hinging part 2012 is obliquely provided with a folding and hinging chute 2013;

the two hinge members 201 are oppositely arranged, the fixed parts 2011 of the two hinge members 201 are fixedly connected to the upper ends of the rear legs 5, a first hinge point 2014 is arranged at the proximal end of one end of the hinge part 2012, the first hinge point 2014 is hinged with the proximal end of the rear end of the seat 2, and the proximal end of the other end of the hinge part 2012 is hinged with the lower end of the backrest 1;

the sliding shaft 202 is slidably disposed in the hinge sliding groove 2013, when the folding chair is unfolded, the included angle α between the rear leg 5 and the chair seat 2 is an obtuse angle, and the sliding shaft 202 slides to the uppermost end of the hinge sliding groove 2013 and abuts against the chair seat 2.

When taking the folding chair, the rear end of seat support 2 receives the overdraft, the rear end of seat support 2 transmits the atress to back leg 5 through first pin joint 2014 this moment, back leg 5 is under the condition of atress this moment, the degree grow of clamp of back leg 5 and seat support 2, back leg 5 drives the hinge and compresses tightly seat support 2 with sliding shaft 202, the atress dispersion of seat support 2 at the rear end this moment is on first pin joint 2014 and sliding shaft 202 and seat support 2's contact surface, avoid the long-term single-point atress of rear end of seat support 2 and damage, can effectively prolong the life-span of folding chair.

The chair seat is characterized by further comprising a connecting rod 30, wherein one end of the connecting rod 30 is hinged to the other end of the hinge, the other end of the connecting rod 30 is hinged to the middle of the front leg 4, and a hinge point of the connecting rod 30 and the front leg 4 is located below the hinge point of the front leg 4 and the chair seat 2.

When the folding chair is contracted from an unfolded state to a folded state, the front end of the chair seat 2 and the upper end of the backrest 1 are drawn close inwards, at the moment, the chair seat 2 rotates by taking a hinge point of the chair seat and the front leg 4 as a fulcrum, the connecting rod 30 pushes the other end of the hinge to rotate backwards around the first hinge point 2014, and at the moment, the hinge folds the rear leg 5 forwards; the same when unfolding the folding chair, the other end of connecting rod 30 pulling hinge is with forward rotation, make the hinge expand back leg 5, the setting can be when unfolding or packing up the folding chair like this, back leg 5 all can be unfolded automatically or pack up, it is more convenient to use, connecting rod 30 plays the effect of interlock when the folding chair expandes or folds, simultaneously when taking the folding chair, connecting rod 30 plays the effect of location to front leg 4, make the atress of folding chair more balanced, increase the bearing capacity of folding chair.

The pillow also comprises an anti-skidding foot seat 40 and a headrest 50, wherein a ball hole 401 is formed in the middle of the anti-skidding foot seat 40; the lower end of the movable rod 61 is provided with a ball head 611, and the ball head 611 is inserted into the ball hole 401;

as shown in fig. 1 and 9, the headrest 50 includes a hanging portion 510, a pillow portion 520 and a fixing member 530, the hanging portion 510 is "door" -shaped, a long hole 511 is formed at a lower end of the hanging portion 510, the fixing member 530 is U-shaped, the fixing member 530 is fixed to an upper end of the backrest 1, a fixing shaft 531 is disposed at an opening of the fixing member 530, the fixing shaft 531 is slidably connected to the long hole 511, and a distance from a lowest end of the long hole 511 to a lowest end of the hanging portion 510 is smaller than a distance from the fixing shaft 531 to the backrest 1; the pillow 520 is fixed to the hanging part 510.

When the folding chair is used on complicated terrains, the contact angle of each front leg 4 and each rear leg 5 is different from the contact angle of the ground, the anti-skid foot seats 40 are connected with the movable feet through the ball heads 611, and the anti-skid foot seats 40 can be adjusted in multiple directions through the arrangement, so that the folding chair can better meet the use requirements of the complicated terrains.

When the user sits on the folding chair, the head can lean against the headrest 50, so that the user can sit more comfortably; since the distance from the lowest end of the long hole 511 to the lowest end of the hanging part 510 is less than the distance from the fixing shaft 531 to the backrest 1, when the hanging part 510 is located at the highest point, the hanging part 510 can be folded backwards; the headrest 50 is designed to be folded backwards, so that the folding chair has smaller volume and is convenient to carry after being folded.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined in the appended claims.

Claims

1. A folding chair with adjustable height is characterized in that: comprises a backrest, a seat, armrests, front legs, rear legs, a height adjusting device and a backrest adjusting device;

the upper ends of the rear legs are hinged with the rear end of the chair seat;

the front legs and the rear legs are both tubular structures;

2. An adjustable height folding chair as claimed in claim 1, wherein: the device also comprises a first cross bar and a second cross bar; the lower ends of the front legs are connected with the first cross rod, and the near ends of the lower ends of the rear legs are connected with the second cross rod;

3. An adjustable height folding chair as claimed in claim 2, wherein: and the outer wall of the movable rod is provided with transverse anti-slip lines.

4. An adjustable height folding chair as claimed in claim 1, wherein: the backrest adjusting device comprises a front foot seat, a handrail chute piece, a rack, a unidirectional rotating assembly and a positioning assembly;

5. An adjustable height folding chair as claimed in claim 4, wherein: the inner ring of the one-way bearing is provided with a spline hole;

the one-way bearing is sleeved on the pin shaft;

6. An adjustable height folding chair as claimed in claim 5, wherein: the backrest adjusting device also comprises a roller sleeve and a roller, two side walls of the adjusting part are also provided with roller holes, two ends of the roller penetrate through the long sliding groove of the handrail sliding groove piece and are fixed in the roller holes, the roller sleeve is rotatably sleeved on the outer side of the roller, and the roller sleeve is positioned in the long sliding groove; the outer diameter of the roller is not smaller than the diameter of the pin shaft.

7. An adjustable height folding chair as claimed in claim 6, wherein: the positioning assembly further comprises a first clamp spring, a second clamp spring and a third clamp spring; the pin shaft is provided with a first positioning ring groove, a second positioning ring groove and a third positioning ring groove;

8. An adjustable height folding chair as claimed in claim 1, wherein: the chair seat and the backrest are of U-shaped structures, and the chair seat further comprises a chair surface, and the chair surface is wrapped on the chair seat and the backrest;

9. An adjustable height folding chair as claimed in claim 8, wherein: the chair seat is characterized by further comprising a connecting rod, one end of the connecting rod is hinged to the other end of the hinge, the other end of the connecting rod is hinged to the middle of the front leg, and the hinged point of the connecting rod and the front leg is located below the hinged point of the front leg and the chair seat.

10. An adjustable height folding chair as claimed in claim 1, wherein: the pillow also comprises an anti-skidding foot seat and a headrest, wherein the middle part of the anti-skidding foot seat is provided with a ball hole; the lower end of the movable rod is provided with a ball head, and the ball head is inserted into the ball hole;