CN210218398U - Hinge assembly and folding chair and folding bed using same - Google Patents
Hinge assembly and folding chair and folding bed using same Download PDFInfo
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- CN210218398U CN210218398U CN201921025434.1U CN201921025434U CN210218398U CN 210218398 U CN210218398 U CN 210218398U CN 201921025434 U CN201921025434 U CN 201921025434U CN 210218398 U CN210218398 U CN 210218398U
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Abstract
The utility model discloses a hinge assembly, which is applied to a folding chair or a folding bed, and 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, the hinge part is obliquely provided with a hinge sliding groove, and the two hinge components are oppositely arranged; the sliding shaft is slidably arranged in the hinge sliding groove. Use the utility model discloses a folding chair can avoid the rear end single-point atress of seat support in the stress dispersion of first hinge point and the contact surface of sliding shaft and seat support.
Description
Technical Field
The utility model relates to the field of outdoor articles, especially, relate to a hinge subassembly and use its folding chair, folding bed.
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. Because folding chair is when taking, the most part weight of human body all falls in the rear end of seat support, and present folding chair is the single-point connection usually in the articulated department of back and seat support, and the seat support appears damaging easily under the condition of single-point hard for a long time, provides the connecting piece that can avoid the rear end single-point atress of seat support and is the problem that needs to solve at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a hinge subassembly and use its folding chair, folding bed to solve above-mentioned problem.
To achieve the purpose, the utility model adopts the following technical proposal:
a hinge assembly is applied to a folding chair or a folding bed and comprises two hinge components and a sliding shaft which are mutually mirror images;
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, the hinge part is obliquely provided with a hinge sliding groove, and the two hinge components are oppositely arranged;
the sliding shaft is slidably arranged in the hinge sliding groove.
The fixing part is arc-shaped.
The hinge assembly is made of aluminum alloy materials.
A use foretell folding chair of hinge subassembly which characterized in that: the chair also comprises a backrest, a chair seat, armrests, front legs, rear legs and a chair surface;
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 fixing parts of the two hinge components are fixedly connected to two sides of the upper end of the rear leg, 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 rear end of the seat, and the other end of the hinge part is hinged with the lower end of the backrest;
the rear end of the armrest is 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 hinged with the middle parts of the armrests;
when the folding chair is unfolded, the rear legs 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 is propped against the chair seats.
The foldable chair 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 foot, and a hinge point of the connecting rod and the front foot is located below the hinge point of the front foot and the chair seat.
The backrest adjusting device is also included;
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 gear, 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;
a limiting block is arranged on the side face of the rack, the limiting block and the third annular groove are respectively positioned on two sides of the one-way bearing, and the third clamp spring is clamped in the third positioning annular groove;
the device also comprises a first cross bar and a second cross bar; the two ends of the first cross rod are connected between the front legs, and the second cross rod is connected between the rear legs.
A folding bed using the hinge assembly.
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 structural view of a hinge member according to an embodiment of the present invention;
FIG. 2 is a schematic view of the hinge assembly of one embodiment of the present invention mounted on a folding chair;
FIG. 3 is a schematic view of a folding chair according to one embodiment of the present invention;
fig. 4 is a schematic structural view of a backrest adjusting device according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional view of a backrest adjusting device according to an embodiment of the present invention;
fig. 6 is a schematic structural view of a unidirectional rotating assembly according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a pin shaft according to an embodiment of the present invention;
in the attached drawings, the chair comprises a backrest 1, a seat 2, a handrail 3, a front leg 4, a rear leg 5, a backrest 7 adjusting device 71, a front foot seat 711, an adjusting part 7111, an adjusting hole 7112, a positioning block 7113, a roller hole 7113, a connecting part 712, a handrail 72, a sliding groove component 721, a long sliding groove 73, a rack 731, a limiting block 74, a unidirectional rotating component 741, a unidirectional bearing 7411, a spline hole 742, a gear 75, a positioning component 751, a pin shaft 7511, a trigger sliding groove 7512, a spring hole 7513, a first positioning ring groove 7514, a second positioning ring groove 7514, a third positioning ring groove 7515, a trigger 752, a first step 7521, a second step 7522, a second elastic element 753, a first elastic spring 754, a second roller 755, a third elastic spring 756, a rolling sleeve 76, a rolling sleeve 77-cross bar 8, a first cross bar 9-a second hinge part 10-2011, a connecting rod component 201-2011, a hinge joint 20-35202, a hinge joint angle-included angle component 2014- α, a hinge sliding groove 201-a hinge shaft 35202.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The hinge assembly 20 of the present embodiment is applied to the connection between the rear leg 5 and the seat 2 of a folding chair, and the hinge assembly 20 includes 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, the hinging part 2012 is obliquely provided with a folding and hinging chute 2013, and the two folding and hinging members 201 are arranged oppositely;
the sliding shaft 202 is slidably disposed in the hinge chute 2013.
The fixed parts 2011 of the two hinge members 201 are fixedly connected to the upper ends of the rear legs 5, the proximal end of one end of the hinge part 2012 is provided with a first hinge point 2014, 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;
when the folding chair is unfolded, the included angle α between the rear leg 5 and the chair seat 2 is obtuse, and the sliding shaft 202 slides to the uppermost end of the hinge chute 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 fixed portion 2011 has an arc shape.
The rear legs 5 of the folding chair are generally cylindrical, so that the fixing part 2011 is closely attached to the rear legs 5, and the fixing part 2011 can be better fixed on the rear legs 5.
The hinge assembly 20 is made of aluminum alloy.
The folding chair has higher strength and lower weight, can better meet the lightweight design of the folding chair on the premise of sufficient strength, and has excellent antirust performance and longer service life.
A folding chair using the hinge assembly 20 further comprises a backrest 1, a seat 2, armrests 3, front legs 4, rear legs 5 and a seat surface 10;
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 fixed parts 2011 of the two hinge members 201 are fixedly connected to two sides of the upper end of the rear leg 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 rear end of the seat 2, and the other end of the hinge part 2012 is hinged with the lower end of the backrest 1;
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 hinged with the middle parts of the armrests 3;
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 folding chair further comprises a connecting rod 30, wherein one end of the connecting rod 30 is hinged with the other end of the folding hinge, the other end of the connecting rod 30 is hinged with the middle part of the front foot, and the hinged point of the connecting rod 30 and the front foot is positioned below the hinged point of the front foot 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 folding chair atress more balanced, increase the bearing capacity of folding chair.
Also comprises a backrest adjusting device 7;
the backrest adjusting device 7 comprises a front foot seat 71, an armrest chute piece 72, a rack 73, a one-way rotating 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 the outer ring of the one-way gear 742, 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; the pin shaft 751 is provided with a first positioning ring groove 7513, a second positioning ring groove 7514 and a third positioning ring groove 7515;
the first snap spring 754 and the second snap spring 755, which are respectively located at the proximal ends of the two ends of the pin 751, of the first positioning ring groove 7513 and the second positioning ring groove 7514, are clamped on the first positioning ring groove 7513, the second snap spring 755 is clamped on the second positioning 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 ring groove 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 device also comprises a first cross bar 8 and a second cross bar 9; the two ends of the first cross rod 8 are connected between the front legs 4, and the second cross rod 9 is connected between the rear legs 5.
The strength of the folding chair can be improved by the arrangement, the two front legs 4 are connected with each other, the two rear legs 5 are connected with each other, and the front legs 4 and the rear legs 5 are not easy to be forked when the folding chair is stressed greatly.
A folding bed using the hinge assembly.
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 (10)
1. The utility model provides a hinge subassembly, is applied to folding chair or folding bed which characterized in that: 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, the hinge part is obliquely provided with a hinge sliding groove, a first hinge point is arranged at the near end of one end of the hinge part, and the two hinge components are oppositely arranged;
the sliding shaft is slidably arranged in the hinge sliding chute;
the first hinge point is used for being hinged with the seat, and the sliding shaft is used for being pressed on the seat.
2. A hinge assembly according to claim 1, wherein: the fixing part is arc-shaped.
3. A hinge assembly according to claim 1, wherein: the hinge assembly is made of aluminum alloy materials.
4. A folding chair using a hinge assembly according to any one of claims 1-3, wherein: the chair also comprises a backrest, a chair seat, armrests, front legs, rear legs and a chair surface;
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 fixing parts of the two folding and hinging components are fixedly connected to two sides of the upper end of the rear leg, the first hinging point is hinged with the rear end of the seat, and the other end of the hinging part is hinged with the lower end of the backrest;
the rear end of the armrest is 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 hinged with the middle parts of the armrests;
when the folding chair is unfolded, the rear legs 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 is propped against the chair seats.
5. A folding chair as claimed in claim 4, wherein: the foldable chair 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 foot, and a hinge point of the connecting rod and the front foot is located below the hinge point of the front foot and the chair seat.
6. A folding chair as claimed in claim 4, wherein: the backrest adjusting device is also included;
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 gear, 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.
7. A folding chair as claimed in claim 6, wherein: 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.
8. A folding chair as claimed in claim 7, 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.
9. A folding chair as claimed in claim 7, 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;
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;
a limiting block is arranged on the side face of the rack, the limiting block and the third annular groove are respectively positioned on two sides of the one-way bearing, and the third clamp spring is clamped in the third positioning annular groove;
the device also comprises a first cross bar and a second cross bar; the two ends of the first cross rod are connected between the front legs, and the second cross rod is connected between the rear legs.
10. A folding bed using a hinge assembly as claimed in any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921025434.1U CN210218398U (en) | 2019-07-03 | 2019-07-03 | Hinge assembly and folding chair and folding bed using same |
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| CN201921025434.1U CN210218398U (en) | 2019-07-03 | 2019-07-03 | Hinge assembly and folding chair and folding bed using same |
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| CN210218398U true CN210218398U (en) | 2020-03-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113230049A (en) * | 2021-03-29 | 2021-08-10 | 浙江英洛华康复器材有限公司 | Folding wheelchair |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113230049A (en) * | 2021-03-29 | 2021-08-10 | 浙江英洛华康复器材有限公司 | Folding wheelchair |
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