CN113349588A - Folding chair structure - Google Patents

Abstract

The invention relates to the technical field of furniture, in particular to a folding chair structure, which comprises a front chair body, a rear chair body and a folding deformation table for switching between two functions of a chair back and a table top body, wherein the folding deformation table comprises a deformation frame and a table board embedded and installed in the deformation frame, a left rear deformation connecting arm is fixed at the left side part of the deformation frame, a right rear deformation connecting arm is fixed at the right side part of the deformation frame, a part extending to the front chair body and close to one end far away from the deformation frame is hinged with a left front deformation connecting arm which can swing back and forth in the left area of the deformation frame and drag the front chair body to move back and forth after being fixed with the left side part of the front chair body, a part extending to the front chair body and close to one end far away from the deformation frame is hinged with a right front deformation connecting arm which can swing back and forth in the right area of the deformation frame and drag the front chair body to move back and forth after being fixed with the right part of the front chair body An arm.

Description

Folding chair structure

Technical Field

The invention relates to the technical field of furniture, in particular to a folding chair structure.

Background

The existing chairs are various in types and more diversified in functions and structures, wherein the folding chair is a chair which is very popular among people in the chairs used in the house, and the existing folding chair is also full of precious.

For example, chinese patent application No. 201220694184.2 discloses a folding chair, which includes a first back lever and a second back lever, which are used to mount a chair back and are arranged in parallel with each other; the first handrail rod is connected with the first backrest rod in a sliding way, and meanwhile, the folding chair can be clamped when in an open state; the second handrail rod is connected with the second backrest rod in a sliding way, and can be clamped when the folding chair is in an open state, wherein the first handrail rod and the second handrail rod are arranged in parallel and have the same structure;

also, for example, the chinese patent with application number 201721907245.8 discloses an aluminum alloy folding chair with adjustable backrest angle, which comprises main legs of the folding chair, a cup fixing opening, a head rest and a base of the folding chair, an auxiliary inclined strut is arranged above the main supporting leg of the folding chair, a handrail of the folding chair is arranged above the water cup fixing port, a folding chair main body is arranged above the back support rod, the head rest frame is connected above the folding chair main body, a folding chair limiter is arranged below the head leaning frame, an angle adjusting head is arranged below the folding chair limiter, a small hydraulic cylinder is communicated with the lower part of the angle adjusting head, the base of the folding chair is arranged below the small hydraulic cylinder, a base mounting groove is installed below a base of the folding chair, a protection bearing is installed below a back support rod, and a rotary adjusting head is installed below the protection bearing.

The existing folding chairs are convenient to fold, store and unfold for use, are generally used by one person, and are not optimized in the aspects of functions, applicability of users and the like.

Disclosure of Invention

The invention aims to provide a folding chair structure suitable for public places.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides a folding chair structure, includes the preceding chair body and the back chair body and be connected with between the preceding chair body and the back chair body and be used for the folding deformation platform that switches between two functions of the back of the chair and the desktop body, folding deformation platform is including can roll around the back chair body backward and drive the preceding chair body rebound coincide on the back chair body and roll forward and drive the preceding chair body forward move take off the deformation frame of back chair body and inlay the platen of installing in the deformation frame, deformation frame left side part be fixed with stretch to the back chair body and lean on the part of keeping away from deformation frame one end with can be in after the articulated back chair body left side part rear chair body left side part the regional swing back and forth left back deformation linking arm in back chair body left side, deformation frame right side part be fixed with stretch to the back chair body and lean on keep away from the part of deformation frame one end with after chair body right side part is articulated can be in the regional swing back and forth right back deformation linking arm in back chair body right side, the left side part of the deformation frame is also hinged with a left front deformation connecting arm which extends to the front chair body, is close to one end far away from the deformation frame, can swing back and forth in the left area of the deformation frame after being fixed with the left side part of the front chair body and drag the front chair body to move back and forth, and the right side part of the deformation frame is also hinged with a right front deformation connecting arm which extends to the front chair body, is close to one end far away from the deformation frame, can swing back and forth in the right area of the deformation frame after being fixed with the right side part of the front chair body and drag the front chair body to move back and forth.

Preferably, a left limiting bearing block which extends leftwards and is used for the left rear deformable connecting arm to swing backwards and then to be placed is fixed at the left side of the rear chair body, and a right limiting bearing block which extends rightwards and is used for the right rear deformable connecting arm to swing backwards and then to be placed is fixed at the right side of the rear chair body.

Preferably, the rear chair body comprises a left rear frame, a right rear frame and a rear chair seat which is erected and connected to the top of the left rear frame and the top of the right rear frame, and a splicing space which is positioned in front of the rear chair seat and used for enabling the front chair body to move backwards and be folded is formed in the upper area of the top of the left rear frame and the top of the right rear frame.

Preferably, the left rear frame includes a left rear top rod, and a left rear first support rod and a left rear second support rod which are fixed on the left rear top rod and are arranged at a distance from each other in a front-rear direction, the left rear top rod, the left rear first support rod and the left rear second support rod form an upright planar support frame, the right rear frame includes a right rear top rod, and a right rear first support rod and a right rear second support rod which are fixed on the right rear top rod and are arranged at a distance from each other in a front-rear direction, and the right rear top rod, the right rear first support rod and the right rear second support rod also form an upright planar support frame.

Preferably, the left rear deformable connecting arm is located in a left side area of the left rear frame, and the right rear deformable connecting arm is located in a right side area of the right rear frame.

Preferably, the deformation frame is formed by sequentially connecting and surrounding a front rod, a left rod, a rear rod and a right rod, the left front deformation connecting arm is positioned in the left area of the left rod and the left rear deformation connecting arm, and the right front deformation connecting arm is positioned in the right area of the right rod and the right rear deformation connecting arm.

Preferably, the front chair body comprises a left front frame, a right front frame and a front chair seat which is connected between the left front frame and the right front frame and can be placed in the splicing space.

Preferably, the left front frame includes a left front push rod, and a left front first support rod and a left front second support rod fixed to the left front push rod and spaced apart from each other in the front-to-back direction, the left front push rod, the left front first support rod, and the left front second support rod form an upright flat-type support frame, the right front frame includes a right front push rod, and a right front first support rod and a right front second support rod fixed to the right front push rod and spaced apart from each other in the front-to-back direction, and the right front push rod, the right front first support rod, and the right front second support rod also form an upright flat-type support frame.

Preferably, the left front transformable connecting arm is fixed to a rear portion of the top of the left front frame and is inclined rearward and upward, and the right front transformable connecting arm is fixed to a rear portion of the top of the right front frame and is inclined rearward and upward.

Preferably, a left L-shaped grab rail is fixedly connected between the left front deformable connecting arm and the top of the left front frame, and a right L-shaped grab rail is fixedly connected between the right front deformable connecting arm and the top of the right front frame.

The invention has the beneficial effects that: 1. the folding and unfolding switching device is more suitable for being used in public places, has better applicability, can switch between a single chair body and a double chair body through folding and unfolding actions, can switch a single chair to a table and chair complex which can be used by more people for eating, reading and the like, and has better flexibility of the number of people;

2. the operation is comparatively convenient, and the cooperation degree between the structure is better, uses comparatively smoothly.

Drawings

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

FIG. 2 is a perspective view of the right front perspective of the folding chair of FIG. 1;

FIG. 3 is a perspective view of the folding chair of FIG. 1 from a rear, upper perspective;

FIG. 4 is a perspective view of the folding chair of FIG. 1 during the process of folding back by deforming the frame;

FIG. 5 is a perspective view of the folding chair of FIG. 1 from a front left perspective;

fig. 6 is a perspective view of the foldable chair according to another embodiment of the present invention from a rear left perspective.

In the figure, a front chair body, b, a rear chair body, c, a folding deformation platform, d, a deformation frame, d0, a bedplate, e1, a left rear deformation connecting arm, e2, a right rear deformation connecting arm, e3, a left front deformation connecting arm, e4, a right front deformation connecting arm, b01, a left limit bearing block, b02, a right limit bearing block, b1, a left rear frame, b2, a right rear frame, b3, a rear chair seat, b30, a splicing space, b11, a left rear push rod, b12, a left rear first supporting rod, b12, a left rear second supporting rod, b12, a right rear push rod, b12, a right rear first supporting rod, b12, a right rear second supporting rod, d 12, a front supporting rod, d 12, a left front supporting rod, d 12, a rear supporting rod, a right front supporting rod, a12, a right front supporting rod, a12, a front supporting rod, a12, a right supporting rod, a front supporting rod, 12, a front supporting rod and a front supporting rod 12, a23, a right front second support rod, f1, a left L-shaped grab rail, f2 and a right L-shaped grab rail.

Detailed Description

The following specific examples are given by way of illustration only and not by way of limitation, and it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the examples without inventive faculty, and yet still be protected by the scope of the claims.

The folding chair of the embodiment adopts a structure that two chair bodies are connected, and can be changed into a folding chair body through folding, and the unfolding is a structural state that the two chair bodies are separated. In the unfolded state, the folding deformation table c can be connected between the two separated chair bodies and becomes a table top, at the moment, the front chair body a and the rear chair body b are in the separated state, and each chair body can be used by multiple people for dining, reading and the like; and under the state that the folding chair body is folded, the folding deformation table c becomes the chair back, the front chair body a and the rear chair body b are folded to become the chair body, and under the state, a row of people can sit on the folded chair body and lean against the chair back for use, so that the chair is in a more comfortable state for rest. The left and right lengths of the front chair body a and the rear chair body b determine the number of people sitting on each chair body, preferably the left and right lengths are more than one meter, so that each chair body can be used by more than two people independently, the folded chair body can also be used by more than two people, but it can be easily seen that the number of people sitting on the folded chair body is twice as many in the unfolded state, and the folded deformable table c with the functions of the chair back and the table top body switched is more suitable for public occasions such as dining halls, libraries and the like because the front chair body a and the rear chair body b which are more similar to the stools are arranged at a distance from each other in the unfolded state and connected with a table top in the middle, and it is emphasized that the front chair body a and the rear chair body b are in a structure without a backrest as much as possible, and preferably in a structure with two long stools, the specific structure will be described in detail later, and the chair can be similar to the existing fixed dining table stool conjoined structure used in canteens and libraries, and the difference lies in that the folding chair of the application can be folded to become a chair, especially in canteens and libraries of factories, for example, after eating rice and reading books, people want to sit and rest better, the front chair body a and the rear chair body b are folded to form an integral chair with a chair back in the true sense, so that the chair can not only reduce the volume to match with the requirements in logistics during transportation or storage, and more importantly, the chair can realize two distinct use functions through folding and unfolding. Specifically, the method comprises the following steps:

the folding deformation platform c comprises a deformation frame d which can roll backwards around a rear chair body b to drive a front chair body a to move backwards and overlap on the rear chair body b and roll forwards to drive the front chair body a to move forwards and separate from the rear chair body b, and a platform plate d0 embedded and installed in the deformation frame d, wherein the platform plate d0 is fixed in the deformation frame d as a bearing panel, the deformation frame d preferably adopts a rectangular frame, and in an unfolded state, the deformation frame d is in a flat-laid shape and is used as a table in order to enable the folding deformation platform c to be used as a table and to be unfolded to a folded state, the deformation frame d is realized by rolling backwards to an area behind the rear chair body b, so that the folding deformation platform c can be used as a chair back, of course, the folding deformation platform c can be overlapped on the rear chair body b by driving the front chair body a to move backwards while rolling backwards, and is recovered to the unfolded state from folding to roll forwards the deformation frame d, meanwhile, the chair back form of the folding deformation table c is switched to the table form, and the backward rolling angle of the deformation frame d from the horizontal state is preferably between 90 and 120 degrees, so that if the angle exceeds 90 degrees, the folding deformation table c can be inclined by 0 to 30 degrees after rolling, and the back of a human body is comfortable to lean on. To realize that the backward rolling angle of the deformed frame d from the horizontal state is preferably 90-120 degrees, the left rear deformed connecting arm e1 and the right rear deformed connecting arm e2 are required to be inclined forward and upward in the unfolded state, the left rear deformed connecting arm e1 and the right rear deformed connecting arm e2 are mentioned later, and when they are finally folded backward, they are preferably horizontal, that is, the included angle between the left rear deformed connecting arm e1 and the horizontal plane of the rear side is 90-120 degrees, and this included angle is exactly the angle of the deformed frame d which is turned backward from the horizontal, and the right rear deformed connecting arm e2 on the right side is also designed in the same way as on the left side, and is preferably in left-right mirror symmetry. In the unfolded state, the folding deformation table c is flatly laid at the position above the front and back intervals of the front chair body a and the back chair body b, and the folding deformation table c, the front chair body a and the back chair body b are in a triangular arrangement. Further, in order to realize the above-mentioned switching states, a left rear deformable connecting arm e1 is fixed to the left side of the deformable frame d, which extends toward the rear body b, a portion of the deformable frame d near one end of the deformable frame d is hinged to the left side of the rear body b, and can swing back and forth in the left area of the rear body b, a right rear deformable connecting arm e2 is fixed to the right side of the deformable frame d, which extends toward the rear body b, a portion of the deformable frame d near one end of the deformable frame d is hinged to the right side of the rear body b, and can swing back and forth in the right area of the rear body b, a left front deformable connecting arm e3 is hinged to the left side of the deformable frame d, which can swing back and forth in the left area of the deformable frame d and drag the front body a to move back and forth after a portion of the deformable frame a near one end of the deformable frame d is fixed to the left side of the front body a, the right side part of the deformation frame d is also hinged with a right front deformation connecting arm e4 which extends to the front chair body a, is fixed with the part of the right side part of the front chair body a, and can swing back and forth in the area of the right side of the deformation frame d and drag the front chair body a to move back and forth. The left rear deformable connecting arm e1 and the right rear deformable connecting arm e2 can swing around the rear chair body b, namely can rotate and roll back and forth in a vertical plane, so that a fixed deformable frame d can be driven to roll back and forth to adjust the position and the angle so as to deform, and due to the arrangement of the left front deformable connecting arm e3 and the right front deformable connecting arm e4, the front chair body a can be dragged backwards by the deformable frame d after the deformable frame d rolls backwards, and meanwhile, due to the design of hinging with the deformable frame d, the left rear deformable connecting arm e1 and the right rear deformable connecting arm e2 have a horizontal supporting form which can be always kept in a use state, so that the left rear deformable connecting arm e1 and the right rear deformable connecting arm e can be used independently in an unfolding state or can be folded on the rear chair body b in a folding state, and the use state can be kept for people to use.

On the premise of the frame structure, specific structural details can be further designed to achieve better effects.

A left limit bearing block b01 which extends leftwards and is used for the left rear transformable connecting arm e1 to swing backwards and to be placed is fixed at the left side part of the rear chair body b, and a right limit bearing block b02 which extends rightwards and is used for the right rear transformable connecting arm e2 to swing backwards and to be placed is fixed at the right side part of the rear chair body b. The left limit bearing block b01 and the right limit bearing block b02 enable the deformed frame d to be limited when being turned backwards, and the deformed frame d can be supported on the left limit bearing block b01 and the right limit bearing block b02 through the left rear deformation connecting arm e1 and the right rear deformation connecting arm e2 in the process of turning backwards the folding chair body, so that the deformed frame d can be well supported and is not easy to move upwards and downwards. The left and right lengths of the left limit bearing block b01 and the right limit bearing block b02 are not too large, so long as the left rear transformable connecting arm e1 and the right rear transformable connecting arm e2 can be used by touching, and the overlapping of the left and right side structures of the front chair body a can be influenced by too long length.

Further, the rear chair body b comprises a left rear frame b1, a right rear frame b2 and a rear chair seat b3 which is erected and connected on the top of the left rear frame b1 and the top of the right rear frame b2, and a split space b30 which is positioned in front of the rear chair seat b3 and used for enabling the front chair body a to move backwards and fold is further formed above the top of the left rear frame b1 and the top of the right rear frame b 2. That is, a portion of the top of the left rear frame b1 and the top of the right rear frame b2 is located so as to protrude forward beyond the rear seat b3, and the upper region of the protruding portion is the fitting space b30, so that the seat portion of the front body a can be placed backward in the fitting space b30 and supported on the top of the left rear frame b1 and the top of the right rear frame b 2. After the front chair body a is put into the splicing space b30, the frame parts of the left and right sides of the front chair body a can be just supported on the ground as far as possible, so that the weight of the chair and the bearing weight can be shared better by the frame parts of the left and right sides of the rear chair body b and the front chair body a, and the supporting performance can be better.

Specifically, the left rear frame b1 includes a left rear post bar b11, a left rear first support bar b12 and a left rear second support bar b13 fixed to the left rear post bar b11 at a distance from each other, a left rear first support bar b12 may be fixed to a front end of the left rear post bar b11, a left rear second support bar b13 may be fixed to a rear end of the left rear post bar b11, the left rear first support bar b12 and the left rear second support bar b13 extend downward for support, the left rear post bar b11, the left rear first support bar b12 and the left rear second support bar b13 form an upright planar support frame, the left rear first support bar b12 and the left rear second support bar b13 serve as left two legs, and the left rear post bar b11, the left rear first support bar b12 and the left rear second support bar b13 may be fixed by welding using square steel tubes. Generally, the left rear ejector pin b11 can be horizontally extended, and the left rear first supporting rod b12 and the left rear second supporting rod b13 are in a standing supporting state; the left rear first support bar b12 preferably inclines downward and the left rear second support bar b13 preferably inclines downward, so that the rear seat b can be raised in the front and rear support range to improve the stability without being completely vertically arranged. The structure of the planar support frame means that the left side surfaces of the left rear ejector rod b11, the left rear first support rod b12 and the left rear second support rod b13 are preferably coplanar, and the right side surfaces are also preferably coplanar, so that mainly more parts of the frame structure formed by the left rear ejector rod b11, the left rear first support rod b12 and the left rear second support rod b13 are located in the same vertical plane in the vertical direction to better support in the vertical direction, and the left side and the right side are kept flat, so that the planar support frame is made of square steel pipes with the same left and right dimensions. Similarly, the right rear frame b2 includes a right rear post rod b21, a right rear first support rod b22 and a right rear second support rod b23 fixed to the right rear post rod b21 and spaced apart from each other in the front-rear direction, a right rear first support rod b22 may be fixed to a front end portion of the right rear post rod b21, a right rear second support rod b23 may be fixed to a rear end portion of the right rear post rod b21, the right rear first support rod b22 and the right rear second support rod b23 may extend downward for support, and the right rear post rod b21, the right rear first support rod b22 and the right rear second support rod b23 may also form an upright planar support frame. The right rear frame b2 and the left rear frame b1 are in left-right mirror symmetry and can be made of square steel tubes. The left limit bearing block b01 can be welded and fixed on the left side surface of the left rear second support bar b13, or the left side surface of the left rear ejector pin b11, or the left side surface of the junction of the left rear second support bar b13 and the left rear ejector pin b11 by adopting a square steel pipe or a square steel block, and the left limit bearing block b01 is arranged at the rear part of the left rear frame b1, for example, at the upper end position of the left rear second support bar b 13; the right limit bearing block b02 can also be welded and fixed on the right side surface of the right rear second support bar b23, or the right side surface of the right rear ejector pin b21, or the right side surface of the junction of the right rear second support bar b23 and the right rear ejector pin b21 by adopting a square steel pipe or a square steel block, and the right limit bearing block b02 is positioned at the rear part of the right rear frame b2, for example, at the upper end position of the right rear second support bar b 23.

Further, the left rear tether arm e1 is located in the left side region of the left rear bezel b1, and the right rear tether arm e2 is located in the right side region of the right rear bezel b 2. The left rear transformable connecting arm e1 and the right rear transformable connecting arm e2 are preferably made of square steel tubes, in the unfolded state, the left rear transformable connecting arm e1 and the right rear transformable connecting arm e2 are in a downward extending state, the lower end part of the left rear transformable connecting arm e1 is preferably hinged with the front end part of the left rear first supporting rod b12 through a hinge shaft which penetrates through the left rear first supporting rod and the right rear first supporting rod from left to right and is positioned on the left side of the left rear frame b1, the left rear transformable connecting arm e1 can freely swing back and forth until the lower end part of the left rear transformable connecting arm e1 is limited by the continuous swinging of the left limiting bearing block b01 from back to bottom, of course, the lower end part of the left rear transformable connecting arm e1 can also be hinged with other parts of the left rear frame b1, and the left rear transformable connecting arm e1 can drive the transformable frame d to swing and deform back and forth by hinging with the front parts. In addition, in order to better limit and support the left rear transformable connecting arm e1 abutting against the left limit bearing block b01, the upper surface of the left limit bearing block b01 is kept as horizontal as possible, the hinged shaft of the left rear transformable connecting arm e1 and the left rear frame b1 is preferably arranged in the front upper part of the left limit bearing block b01, thus, the left rear deformation connecting arm e1 can be just flatly leaned on the left limit bearing block b01 when swinging backwards and keeping the horizontal state, the vertical distance between the center of the hinge shaft and the upper surface of the left limit bearing block b01 can be equal to the vertical distance between the center of the hinge shaft and the bottom surface of the left rear transformable connecting arm e1 when the left rear transformable connecting arm e1 is horizontally placed, the better leaning support can be realized, of course, the length of the left rear deformation connecting arm e1 can swing backwards to lean against the left limit bearing block b01, and after all, the deformation frame d is rolled to the rear side area of the rear chair body b. Similarly, the lower end portion of the right rear tether arm e2 is preferably hinged to the front end portion of the right rear first support rod b22 via a hinge shaft passing through the right and left side members and located on the right side of the right rear frame b2 and freely swingable back and forth until it is restrained by the right stopper bearing block b02 from continuing to swing back and down, so as to support the right rear tether arm e 2. Of course, the right rear deformable connecting arm e2 may be hinged to the other portion of the right rear frame b2 in the front direction, and the deformable frame d may be swung and deformed in the front-rear direction by being hinged to the front portion. Thus, the left rear tether arm e1 and the right rear tether arm e2 are deformed to bring the deforming frame d to an effective rolling motion at both left and right sides. The structural design of the right rear transformable connecting arm e2 and the right limit bearing block b02 can refer to the structures of the left rear transformable connecting arm e1 and the left limit bearing block b01 on the left and right, and the structural design is left-right mirror symmetry with the left structure, and mainly aims to enable the right rear transformable connecting arm e2 to swing better, and improve the stability of the limit static support, the avoidance performance during movement between structures and the like.

Furthermore, the deformed frame d is formed by sequentially connecting and surrounding a front side rod d1, a left side rod d2, a rear side rod d3 and a right side rod d4, the front side rod d1, the left side rod d2, the rear side rod d3 and the right side rod d4 can also be made of square steel pipes and are sequentially connected end to end through welding to form a rectangular frame structure, and the frame structure is also flat. And the left front tether arm e3 is located in the left side region of the left side bar d2 and the left rear tether arm e1, and the right front tether arm e4 is located in the right side region of the right side bar d4 and the right rear tether arm e2, which are similar to the linkage structure between the rear seat body and the tether frame d, but different from each other, specifically, the left side bar d2 and the left rear tether arm e1 are preferably formed in a planar L-shape or a structure similar to the L-shape, that is, the left and right sides are coplanar, the top end of the left rear tether arm e1 is preferably welded and fixed to the bottom surface of the rear end of the left side bar d2, so that the left front tether arm e3 can move freely in the left side region of the left side bar d2 and the left rear tether arm e1 without interference during folding or unfolding, and the left rear tether arm e1 is not interfered by the left rear frame b1, therefore, the left rear deformable connecting arm e1 and the left front deformable connecting arm e3 can move freely during folding and unfolding of the left side part of the chair. Similarly, the right rod d4 and the right rear tether arm e2 are preferably formed in a planar L-shape or a structure similar to the L-shape, i.e. the left and right sides are coplanar, and the top end of the right rear tether arm e2 is preferably welded and fixed to the bottom surface of the rear end of the right rod d4, also for the smooth movement of the tether. The flat or planar frame structure is not only non-interfering with the deformation, but is also a more stable structure to the forces applied to the structure itself.

The coplanar condition in the planar frame structure mentioned above or later is preferably at least that the parts of the left side structure and the right side structure of the chair are coplanar, for example, in the planar frame structure on the left side of the chair, the coplanar condition is ensured as much as possible because the outer part is the part where the deformation action will affect, and the optimization of the structure itself and the reduction of the action interference are all better.

The structure of the front side of the whole chair is as follows: the front chair body a comprises a left front frame a1, a right front frame a2, and a front chair seat a3 which is connected between the left front frame a1 and the right front frame a2 and can be placed in a split space b 30. More specifically, the left front frame a1 includes a left front post rod a11, a left front first support rod a12 and a left front second support rod a13 fixed to the left front post rod a11 and spaced apart from each other in the front-rear direction, the left front post rod a11, the left front first support rod a12 and the left front second support rod a13 form an upright planar support frame, the right front frame a2 includes a right front post rod a21, a right front first support rod a22 and a right front second support rod a23 fixed to the right front post rod a21 and spaced apart from each other in the front-rear direction, and the right front post rod a21, the right front first support rod a22 and the right front second support rod a23 also form an upright planar support frame. Each rod in the left front frame a1 and the right front frame a2 can also be made of square steel tubes and fixed by welding, and the structure can refer to the left rear frame and the right rear frame, and the difference lies in the connection mode of the left front deformation connecting arm e3 and the right front deformation connecting arm e 4: the left front morphing link arm e3 is fixed to the rear portion of the top of the left front frame a1 and tilted upward and rearward, the right front morphing link arm e4 is fixed to the rear portion of the top of the right front frame a2 and tilted upward and rearward, preferably, both the left front morphing link arm e3 and the right front morphing link arm e4 may be of a square steel tube structure, in the unfolded state, the lower end of the left front morphing link arm e3 may be welded and fixed to the rear end portion of the left front post rod a11 or welded and fixed to the upper end portion of the left front second post rod a13, specifically, in a manner that the rear end of the left front post rod a11 is fixedly welded to the upper portion of the front side of the left front second post rod a13, the left front second post rod a13 is in a standing state, the main body extends downward and the upper end portion exceeds the left front post rod a11 and is welded and fixed to the lower end portion of the left front morphing link arm e3, the left front tether arm e3 and the left and right side surfaces of the left front carrier bar a11 are preferably coplanar, i.e., the left front tether arm e3 and the left front frame a1 form a flat planar frame, so as to optimize the structure, the left front first supporting rod a12 can be welded and fixed to the front end of the left front carrier bar a11 through the upper portion of the rear side surface thereof, the left front first supporting rod a12 is also intended to extend downward, and the front first supporting rod a12 and the left front second supporting rod a13 serve as two legs on the left side of the front seat body. Preferably, in the unfolded state of the entire chair, the upper end portion of the left front tether e3 is positioned to the left of the left rod d2 and is hinged by means of a hinge shaft passing through both the upper end portion of the left front tether e3 and the front end portion of the left rod d2 in the left-right direction. The structure of the left front deformable linking arm e3 that is inclined is also of special significance and preferably to a greater extent than the left rear deformable linking arm e1, the angle between the left front deformable linking arm e3 and the front horizontal plane is preferably between 120 and 150 degrees, which is also understood to be the angle between the left front deformable linking arm e3 and the left front carrier rod a11 towards the front, while the left front deformable linking arm e3 and the left front frame a1 are fixed structures so that the angle is always fixed, unlike the left rear deformable linking arm e1, the left rear deformable linking arm e1 is the main driving part for rolling, and is inclined in the unfolded state but becomes horizontal in the folded state by rolling backwards. The left front deformable connecting arm e3 is inclined such that there is a horizontal space between the front seat a3 and the front rod d1 of the deformable frame d, when the two chair bodies are used independently in the unfolded state of the whole chair, the user can have enough space to enter the front chair body, when the two chair bodies are folded, the deformable frame d can be wound around the rear side of the rear seat b3, the rear seat is better between the front seat a3 and the deformable frame d, that is, after the front seat a3 is filled into the splicing space b30, the three can keep better horizontal contact state, when the chair is unfolded, the rear seat side has the splicing space b30, so that all users can conveniently enter the rear chair body for comfortable use, therefore, the left rear deformable connecting arm e1 is not inclined too much or not inclined in the unfolded state, if there is an inclination, the deformable frame d is inclined backwards to have a certain inclination for leaning on the back, the foregoing has been mentioned in this regard. While the connection of left front tether arm e3 has been described in detail in this paragraph, right front tether arm e4 is fully described with reference to left front tether arm e3, i.e., the right side relates to the connection of right front tether arm e4, and may be configured to be left-hand and preferably mirror-symmetrical to the left-hand, and of course to operate synchronously with the left-hand during use or adjustment of the chair.

It is important to note that the heights of the hinge axes of the left front transformable connecting arm e3 and the left rod d2 and the hinge axes of the right front transformable connecting arm e4 and the right rod d4 are the same in the unfolded state and the folded state of the chair, that is, the heights of the hinge axes are not changed before and after the transformation frame is turned over, so as to ensure that the front chair body only moves horizontally and does not move vertically, thereby ensuring that the front chair body is better used, based on the structure, taking the left side structure of the chair as an example, the vertical height difference between the upper surface and the lower surface of the left limiting bearing block b01 in the unfolded state of the hinge axes of the left front transformable connecting arm e3 and the left rod d2 is equal to the vertical distance between the hinge axes of the left front transformable connecting arm e3 and the left rod d2 in the unfolded state and the rear side of the left transformable connecting arm e1, and the right side of the chair is designed with reference to the left side, the hinged shaft at the position can ensure that the front chair body does not move up and down when the hinged shaft is unfolded to be overturned and folded forwards.

Preferably, the hinge axis j of the upper end portion of the left front transformable connecting arm e3 and the front end portion of the left rod d2 is located at the rear side of the front end face of the left rod d2, so that the left rod d2 forms a left overlapped lifting section d200 between the hinge axis and the front end face of the left rod d2, the front portion of the right rod d4 forms a corresponding right overlapped lifting section d400, the left front transformable connecting arm e3 is preferably welded and fixed with a left limit support lifting rod d201 extending to the right, the right front transformable connecting arm e4 is preferably welded and fixed with a right limit support lifting rod d401 extending to the left, in the unfolded use state of the chair, the left limit support lifting rod d201 is preferably located below the left rod d2 and right abuts against the left rod d2, and the right limit support lifting rod d401 is preferably located below the right rod d4 and right abuts against the right rod d4, in the unfolded use state of the left rod 2 and the right rod d4, therefore, on one hand, the vertical support of the hinge shafts on two sides can be shared; on one hand, the deformation frame d can be limited to continuously roll forwards to cause the forward movement or the easy movement of the front chair body under the condition that a person sits, so that the structure is not stable enough, and the backward rolling is needed to lift the front chair body, so that the person is not easy to move under the condition that the person sits, and the limitation structure is not needed; on the other hand, it is important that when the chair needs to be folded, the front chair body can be lifted first, the front chair body supports the deformed frame d by the left limit support lifting rod d201 and the right limit support lifting rod d401, and is lifted upwards and backwards, so that the deformed frame d is turned backwards by the left rear deformable connecting arm e1 and the right rear deformable connecting arm e2, thus a lever force is very labor-saving, when the left rear deformable connecting arm e1 and the right rear deformable connecting arm e2 are located, namely reach a backward horizontal position, then the deformed frame d is located correspondingly, especially when the left limit bearing block b01 and the right limit bearing block b02 are present, the left rear deformable connecting arm e1 and the right rear deformable connecting arm e2 can be located better, thus the chair is folded by half, and then the lifted front chair body is turned downwards by the hinge shaft j of the left front deformable connecting arm e3 and the right front deformable connecting arm e4 and the deformed frame d and the hinge shaft j of the front seat 3 are put into the front seat space 30 b 78 b Can be prepared.

In a more preferable design of the chair structure, a left rear bottom reinforcing rod b14 extending forward and backward and located below the left rear top bar b11 is fixed between the left rear first supporting rod b12 and the left rear second supporting rod b13, the left rear bottom reinforcing rod b14 may be a square steel tube, and is welded and fixed at front and rear ends between the left rear first supporting rod b12 and the left rear second supporting rod b13, a right rear bottom reinforcing rod b24 extending forward and backward and located below the right rear top bar b21 is fixed between the right rear first supporting rod b22 and the right rear second supporting rod b23, and the right rear bottom reinforcing rod b24 may be a square steel tube, and is welded and fixed at front and rear ends between the right rear first supporting rod b22 and the right rear second supporting rod b 23. And the left rear bottom reinforcing rod b14 is a middle rear reinforcing bottom rod b124 which extends left and right between the front and rear middle parts of the left rear bottom reinforcing rod b14 and the front and rear middle parts of the right rear bottom reinforcing rod b24, the middle rear reinforcing bottom rod b124 can be welded between the left rear bottom reinforcing rod b14 and the right rear bottom reinforcing rod b24 by adopting a square steel tube, and the three parts of the reinforcing structure are in a T shape, so that the strength of the rear chair body is enhanced, and particularly in the folding state of the chair, the rear chair body can play a more role of supporting the base. The front chair body does not need to adopt the T-shaped structure, on one hand, much support is supported by the rear chair body when the front chair body is folded, and in the folded state, the two chair bodies share the T-shaped reinforcing structure, on the other hand, the folding action can be influenced by the T-shaped reinforcing structure, and particularly, if the front chair body has a structure extending leftwards and rightwards like the middle rear reinforcing bottom rod b124, the downward action can be blocked when the front chair body is folded on the rear chair body.

It is also important to design the seat, wherein the rear seat b3 may include two rear seat reinforcing rods b31 spaced apart from each other and extending left and right, and a rear seat plate b32 extending left and right and fixed between the two rear seat reinforcing rods b31, the rear seat reinforcing rods b31 are preferably made of square steel tubes, and the lower surfaces of the left and right ends of the rear seat reinforcing rod b31 may be welded and fixed to the upper surface of the left rear push rod b11 and the upper surface of the right rear push rod b21, respectively, so that the rear seat reinforcing rod b31 is above the left rear push rod b11 and the right rear push rod b21, that is, the rear seat reinforcing rod b31 is higher than the left rear push rod b11 and the right rear push rod b21, and the rear seat plate b32 may be made of wood plate structure or wood-plastic plate structure, etc., so that the rear seat plate b32 and the rear seat reinforcing rod b31 may be fixed by passing through the through holes of the two and nuts, in addition, the rear seat plate b32 can be laid with more comfortable plate exterior elements such as soft pads and leather sleeves and a better rear seat plate b32 on the upper surface or the front surface of a base plate such as a wooden plate, however, the uppermost side of the rear seat plate b32 is preferably higher than the rear seat reinforcing rod b31 to ensure the sitting comfort. It can be seen from the above structure that the rear seat b3 is protruded from the upper side of the left rear lift bar b11 and the right rear lift bar b21 as a whole, and according to the design of the split space b30, the split space b30 is the stepped space structure of the front side of the rear seat b3, and the front seat a3 is to be integrated into it, so that the structural design has a better overall effect after being folded. The design of the front seat a3 is preferably different from that of the rear seat, the front seat a3 may include two front seat stiffening rods a31 spaced apart from each other and extending left and right, and a front seat plate a32 extending left and right and fixed between the front seat stiffening rods a31, the two front seat stiffening rods a31 are also preferably made of square steel tubes, and the left and right ends of the two front seat stiffening rods a31 may be welded and fixed to the right side surface of the left front push rod a11 and the left side surface of the right front push rod a21, respectively, the upper and lower thickness dimensions of the two front seat stiffening rods a31 and the left and right front push rods a11 and a21 are preferably equal and the upper and lower heights thereof are kept the same, so that a flat frame structure is formed, the front seat plate a32 is fixed in the frame structure, and the front seat plate a32 is mounted between the two front seat stiffening rods a31, the uppermost side of the front seat plate a32 is preferably higher than the two front seat reinforcing rods a31, and also for comfort, but the difference between the front seat a3 is that the two front seat reinforcing rods a31 are level with the left front ejector rod a11 and the right front ejector rod a21, unlike the aforementioned rear seat reinforcing rod b31 above the left rear ejector rod b11 and the right rear ejector rod b21, so that the rear seat b3 and the front seat a3 can be better stacked on the left rear ejector rod b11 and the right rear ejector rod b21 and can be more level when they are folded, and the overall effect after folding is better, so the upper and lower heights of the rear seat b3 and the front seat a3 are kept as consistent as much as possible. In addition, based on this structure, the height of the left front push rod a11 and the right front push rod a21 is higher than the height of the left rear push rod b11 and the right rear push rod b21, which is advantageous in that, when the front-rear length of the left front push rod a11 and the right front push rod a21 is left and right, the rear portion of the left front push rod a11 and the right front push rod a21 can cover the end portions of the left and right ends of at least a portion of the rear seat reinforcing rod b31 in the horizontal left-right direction, and the exposed end portions are reduced in the folded state, of course, the two ends of the two front seat reinforcing rods a31 are also fixed and covered by the left front push rod a11 and the right front push rod a21 in the left-right direction, and the rear one front seat reinforcing rod a31 of the two front seat reinforcing rods a31 is preferably located at a distance in front of the rear end surfaces of the left front push rod a11 and the right front push rod a21, for example, at a position of 10cm around the rear end surfaces of the left front push rod a11 and the right front push rod a21, has better use effect.

Further, a left L-shaped grab bar f1 is fixedly connected between the left front transformable connecting arm e3 and the top of the left front frame a1, and a right L-shaped grab bar f2 is fixedly connected between the right front transformable connecting arm e4 and the top of the right front frame a 2. The left L-shaped grab rail f1 and the right L-shaped grab rail f2 may be structural rods formed by bending square steel pipes and may be fixed by welding. On the one hand, the structural strength of the front chair body can be enhanced, and on the other hand, the front chair body can be really used as an armrest of the chair in a folding state.

In addition, the platen d0 embedded and fixed in the deformed frame d can be fixed by the existing bolt or screw, the platen d0 can be a wood plate as the base plate, but the upper side of the base plate in the unfolded state of the chair is preferably polished and waxed for some surface treatment, and the lower side is preferably covered with some cushion and leather sheath structure, because in the unfolded state, the upper side of the platen d0 is the use surface, and in the folded state of the chair, the lower side of the platen d0 in the unfolded state becomes the use surface facing forward for the human body to lean against.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A folding chair structure is characterized by comprising a front chair body (a), a rear chair body (b), a folding deformation table (c) connected between the front chair body (a) and the rear chair body (b) and used for switching between two functions of a chair back and a table top body, wherein the folding deformation table (c) comprises a deformation frame (d) which can roll backwards around the rear chair body (b) to drive the front chair body (a) to move backwards and overlap on the rear chair body (b) and roll forwards to drive the front chair body (a) to move forwards and separate from the rear chair body (b) and a table plate (d 0) embedded in the deformation frame (d), the left side part of the deformation frame (d) is fixedly provided with a left rear deformation connecting arm (e 1) which extends towards the rear chair body (b) and is hinged to a part far away from one end of the deformation frame (d) and the left side part of the rear chair body (b) and can swing forwards and backwards in the left side area of the rear chair body (b), a right rear deformation connecting arm (e 2) which extends to the rear chair body (b) and is hinged with the right side part of the rear chair body (b) and can swing back and forth in the right side area of the rear chair body (b) is fixed at the right side part of the deformation frame (d), the left side part of the deformation frame (d) is also hinged with a left front deformation connecting arm (e 3) which extends to the front chair body (a), is close to one end far away from the deformation frame (d), can swing back and forth in the left side area of the deformation frame (d) after being fixed with the left side part of the front chair body (a) and drag the front chair body (a) to move back and forth, the right side part of the deformation frame (d) is also hinged with a right front deformation connecting arm (e 4) which extends to the front chair body (a), is close to one end far away from the deformation frame (d), is fixed with the right side part of the front chair body (a), and can swing back and forth in the right side area of the deformation frame (d) and drag the front chair body (a) to move back and forth.

2. A folding chair structure, according to claim 1, characterized in that said rear chair body (b) has a left stop bearing block (b 01) fixed to its left side portion, extending leftwards, for said left rear transformable connecting arm (e 1) to swing rearwards and a right stop bearing block (b 02) fixed to its right side portion, extending rightwards, for said right rear transformable connecting arm (e 2) to swing rearwards and to rest.

3. A folding chair structure as claimed in claim 1, wherein said rear chair body (b) comprises a left rear frame (b 1) and a right rear frame (b 2), and a rear chair seat (b 3) mounted and connected on the top of said left rear frame (b 1) and the top of said right rear frame (b 2), and a splicing space (b 30) located in front of said rear chair seat (b 3) and used for enabling said front chair body (a) to move backwards and fold is formed above the top of said left rear frame (b 1) and the top of said right rear frame (b 2).

4. A folding chair structure according to claim 3, characterized in that the left rear frame (b 1) comprises a left rear top bar (b 11) and a left rear first support bar (b 12) and a left rear second support bar (b 13) fixed on the left rear top bar (b 11) and arranged at a distance from each other in the front-rear direction, the left rear top bar (b 11), the left rear first support bar (b 12) and the left rear second support bar (b 13) form an upright plane type support frame, the right rear frame (b 2) comprises a right rear top bar (b 21) and a right rear first support bar (b 22) and a right rear second support bar (b 23) fixed on the right rear top bar (b 21) and arranged at a distance from each other in the front-rear direction, and the right rear top bar (b 21), the right rear first support bar (b 22) and the right rear second support bar (b 23) also form an upright plane type support frame.

5. A folding chair structure according to claim 4, characterized in that the rear left deformable connecting arm (e 1) is located in the left area of the rear left frame (b 1) and the rear right deformable connecting arm (e 2) is located in the right area of the rear right frame (b 2).

6. A folding chair structure, according to claim 3, characterized in that said deformable frame (d) is formed by the successive connection and encirclement of a front side bar (d 1), a left side bar (d 2), a rear side bar (d 3) and a right side bar (d 4), said left front deformable linking arm (e 3) being located in the left side area of said left side bar (d 2) and said left rear deformable linking arm (e 1), and said right front deformable linking arm (e 4) being located in the right side area of said right side bar (d 4) and said right rear deformable linking arm (e 2).

7. A folding chair structure according to claim 6, characterized in that the front chair body (a) comprises a left front frame (a 1) and a right front frame (a 2) and a front seat (a 3) connected between the left front frame (a 1) and the right front frame (a 2) and capable of being placed in the split space (b 30).

8. The folding chair structure according to claim 7, wherein the left front frame (a 1) comprises a left front top bar (a 11) and a left front first support bar (a 12) and a left front second support bar (a 13) fixed on the left front top bar (a 11) and spaced back and forth, the left front top bar (a 11), the left front first support bar (a 12) and the left front second support bar (a 13) form an upright planar support frame, the right front frame (a 2) comprises a right front top bar (a 21) and a right front first support bar (a 22) and a right front second support bar (a 23) fixed on the right front top bar (a 21) and spaced back and front first support bar (a 21), right front first support bar (a 22) and right front second support bar (a 23) also form an upright planar support frame.

9. The folding chair structure as claimed in claim 8, wherein said left front tether (e 3) is fixed to the rear top portion of the left front frame (a 1) and inclined rearwardly and upwardly, and said right front tether (e 4) is fixed to the rear top portion of the right front frame (a 2) and inclined rearwardly and upwardly.

10. A folding chair structure, according to claim 9, characterized in that between said left front articulated arm (e 3) and the top of said left front frame (a 1) there is fixedly connected a left L-shaped grab bar (f 1), and between said right front articulated arm (e 4) and the top of said right front frame (a 2) there is fixedly connected a right L-shaped grab bar (f 2).

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