Multifunctional chair frame structure

Abstract

The utility model discloses a multifunctional chair frame structure and a function conversion method thereof. The multifunctional chair frame structure comprises a chair seat frame, a chair ring, a chair back frame, a gear shifting bracket, a connecting rod bracket, a first chair leg frame and a second chair leg frame, the chair ring is detachably and rotatably connected with the front end of the chair seat frame; the bottom end of the chair back frame is detachably and rotatably connected with the rear end of the chair seat frame; the chair back frame is detachably spliced with the rear end of the chair ring; when the backrest is in a semi-lying state, the chair back frame and the chair ring are disconnected, the supporting points at the bottom of the chair ring are supported on two side frames of the chair seat frame, and the chair back frame leans against the rear part of the chair ring; the seat frame is rotationally connected with the gear shifting bracket; the gear shifting bracket is inserted into the connecting rod bracket; the front end and the rear end of the connecting rod bracket are rotationally connected with the first chair leg frame and the second chair leg frame respectively; when the first chair leg frame and the second chair leg frame are folded, the bottoms of the chair legs are supported on the ground to form a sitting state, when the first chair leg frame and the second chair leg frame are unfolded to form a rocking chair state, and the bottoms of the arc-shaped rockers are supported on the ground and are in rolling contact with the ground.

Description

Technical Field

[0001] The invention relates to the technical field of multifunctional chairs, in particular to a multifunctional chair frame structure and a function conversion method thereof. Background Art

[0002] Chairs are one of the essential furniture items in human life. There are countless types and structures of chairs with various functions. Especially for long-term office work and home study, a chair that can meet people's different sitting posture needs is indispensable. Nowadays, there are endless creative multifunctional chairs on the market. Many chairs can adjust the sitting posture, including folding chairs, study chairs, cross chairs, step stools, lunch break chairs, square stools, rocking chairs, etc. The sitting form is relatively single, and long-term sitting can easily cause fatigue. However, due to the limitations of indoor space, it is not possible to prepare various styles of chairs for backup.

[0003] For example, a Chinese patent application with publication number CN 113768305A discloses a multifunctional leisure chair frame structure and a supporting sitting method, comprising a back support, a seat support, a footrest and a support seat; a first connecting rod bracket and a tilting rod are provided between the rear end of the seat support and the back support and the support seat; a second connecting rod bracket is provided between the seat support and the support seat; a third connecting rod bracket is also provided between the seat support, the footrest and the support seat; when the back support is pushed back, the seat support is lifted around the support seat under the support of the tilting rod and the linkage action of the first connecting rod bracket, and the footrest is flipped forward under the linkage action of the third connecting rod bracket; when the back support stops moving, the back support, the seat support and the footrest remain relatively fixed in a force balance state; when the footrest is subjected to a downward thrust, it moves in the opposite direction to retract, the seat support falls and drives the back support to tilt forward, and when the footrest stops moving, the back support, the seat support and the footrest also remain relatively fixed.

[0004] The multifunctional chair can achieve a natural sitting or lying posture without the need for an electric device. Its structure is relatively complex, and most of its components are metal parts. The range of materials for its production is small, and it is not suitable for displaying the style of traditional Chinese furniture. The range of sitting posture adjustment is limited to the shape adjustment of a natural sitting or lying posture, and its function is limited to a leisure chair. It lacks the functional transformation of a rocking chair and a square stool, and its functional range is still insufficient. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a multifunctional chair frame structure with simple operation and good stability. When in use, the chair leg portion can be converted into a sitting state and a rocking chair state by folding and unfolding the first leg frame and the second leg frame. The backrest angle can be converted into a sitting state and a semi-lying state by adjusting the seat ring and the back frame. The seat ring and the back frame can be disassembled so that the whole can be in a square stool state. The height and pitch angle of the seat can be adjusted by changing the connection between the shift bracket and the connecting rod bracket in different gears. When the first leg frame and the second leg frame are in the folded state, the inclination of the chair legs can be fixed by the angle locking block. The simple adjustment and combination realizes The functional conversion of armchairs, square stools, reclining chairs, rocking chairs, and leisure chairs meets the needs of various usage scenarios such as learning, office, dining, lunch breaks, and leisure. Compared with the prior art, the technical solution of the present invention has significant advantages. First, the present invention has comprehensive functions, simple structure, easy and safe operation. Users can easily adjust their sitting posture and convert functions without using complicated tools or techniques. Secondly, the choice of manufacturing materials is more extensive, not limited to raw materials such as wood, metal, and plastic, which provides greater flexibility for production. In addition, the appearance design of the present invention is flexible and changeable, and can fully reflect the artistic style of Chinese furniture and modern furniture, meeting the aesthetic needs of different users.

[0006] Furthermore, the present invention provides a method for converting the functions of the multifunctional chair frame structure.

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

[0008] A multifunctional chair frame structure, comprising a seat frame, a seat ring, a seat back frame, a shift bracket, a connecting rod bracket, a first chair leg frame, and a second chair leg frame; the seat ring and the seat back frame are installed on the upper part of the seat frame, and the seat ring is detachably and rotatably connected to the front end of the seat frame by a pivot connection piece; the bottom end of the seat back frame is detachably and rotatably connected to the rear end of the seat frame by a pivot connection piece; when the backrest is in a sitting state, the seat back frame and the rear end of the seat ring are detachably plugged in, and the seat back frame forms a support for the rear end of the seat ring; when the backrest is in a semi-lying state, the connection between the seat back frame and the seat ring is disconnected, and the seat ring is flipped backward until the fulcrum at the bottom of the seat ring is supported on the frames on both sides of the seat frame, and the seat back frame is flipped backward and leans on the rear end of the seat ring, and the rear end of the seat ring forms a support for the seat back frame; the lower part of the seat frame is respectively connected to the front and rear two shift brackets. The shift bracket is rotatably connected, and the lower end of the shift bracket is respectively plugged into the connecting rod brackets on the left and right sides and locked by a locking block. The connecting rod bracket is provided with a plurality of gear slots, and the height and pitch angle of the seat can be adjusted by changing the connection between the shift bracket and the different gear slots of the connecting rod bracket; the front end and the rear end of the connecting rod bracket are respectively rotatably connected to the first chair leg frame and the second chair leg frame, and the connecting rod bracket is symmetrical on the left and right; the installation position of the first chair leg frame and the second chair leg frame is at the lower part of the connecting rod bracket, and when the first chair leg frame and the second chair leg frame are folded, the bottom of the chair leg is supported on the ground to form a sitting shape, and when they are unfolded, a rocking chair shape is formed, and the bottom of the arc-shaped rocker is supported on the ground and forms a rolling contact with the ground, and is locked by an angle locking block in both the rocking chair shape and the sitting shape.

[0009] Preferably, the front and rear ends of the seat frame are provided with a plurality of pivot connectors embedded in the frame and capable of being flipped over, and the front and rear ends of the bottom are symmetrically provided with axle seats for connecting the shift bracket. The axis lines of the pivot connectors at the front and rear ends of the seat frame are parallel to each other, and the pivot connectors are provided with mortises and pin holes, and the mortises are matched with the tenons of the connected components. The pivot connectors include locking pins, which are locked when inserted into the pin holes and unlocked when pulled out, so that the connected chair ring and chair back frame can be quickly disassembled, and the pivot connectors adopt a pin hole locking form.

[0010] Preferably, the bottom end of the chair back frame is detachably and rotatably connected to the rear end of the seat frame via a pivot connection; the chair back frame is provided with a tenon matched with the pivot connection and a tenon matched with the mortise at the rear of the seat ring; the chair back frame is plugged into the pivot connections on both sides of the rear end of the seat frame and can be locked or unlocked by a locking pin.

[0011] Preferably, both sides of the front portion of the chair circle extend downward respectively and have tenons matched with the pivot connecting parts at the ends. The middle portion of the chair circle is bent downward, and the bottoms of the downwardly bent parts in the middle of both sides serve as the fulcrum of the chair circle when in the rocking chair form. The rear end is provided with mortise holes matched with the tenons on the upper part of the chair back frame. The chair circle is detachably and rotatably connected to the front end of the seat frame through a pivot connecting part, and the tenons on both sides of the front portion of the chair circle are plugged into the pivot connecting part at the front end of the seat frame.

[0012] Preferably, the chair ring and chair back frame are installed above the seat frame. When the chair back frame is connected to the chair ring, the backrest is formed into a sitting shape. When the chair ring and chair back frame are disconnected, they are flipped backwards until the bottom fulcrum supports the seat frame. The rear end of the chair ring supports the chair back frame, and the chair back frame is flipped backwards to lean against the rear end of the chair ring, so that the backrest is formed into a semi-lying shape.

[0013] Preferably, the connecting rod bracket includes an outer plate, an inner plate, a locking block, and a spring, and mounting holes are respectively provided at both ends of the outer plate and the inner plate, the outer plate is provided with a plurality of gear slots, positioning pins, and spring positioning pins, the inner plate can slide axially along the positioning pins, and the spring provides a continuous outward thrust for the inner plate so that the inner plate can automatically fit with the outer plate; the transverse axes at the upper ends of the first chair leg frame and the second chair leg frame are respectively rotatably connected to the locking block, and the locking block is provided with a groove, and is in an unlocked state when the locking block groove is aligned with the positioning pin on the transverse axis, and rotating the locking block can push the inner plate to fit with the outer plate and lock the connection with the shift bracket.

[0014] Preferably, the shift bracket is composed of a swing arm shaft and swing arms fixedly connected at both ends, and is rotatably connected to the front and rear axle seats at the bottom of the seat frame through the swing arm shaft, and can be flipped forward and backward along the axis of the axle seat. The lower end of the shift bracket is detachably connected to any group of gear slots of the connecting rod bracket and locked by a locking block.

[0015] Preferably, the first chair leg frame is a symmetrical structure, with chair legs, arc-shaped rockers and connecting rods on the left and right sides respectively, the upper and lower ends of the chair legs are fixedly connected to the connecting rod and the front end of the arc-shaped rocker respectively, and the rear end of the arc-shaped rocker is fixedly connected to the rear end of the connecting rod, and the arc-shaped rockers, connecting rods and chair legs on the left and right sides are fixedly connected to form a symmetrical frame structure, and the top, rear and lower parts of the frame structures on both sides are fixedly connected to the horizontal axis, the clamping axis and the foot pedal respectively; a locking groove is provided at the junction of the arc-shaped rocker and the connecting rod, and a plurality of angle positioning grooves are provided on the inner side of the middle part of the arc-shaped rocker, and are used to adjust and fix the inclination of the chair legs when the first chair leg frame and the second chair leg frame are folded.

[0016] Preferably, the second chair leg frame is a symmetrical structure, with chair legs, arc-shaped rockers and connecting rods on the left and right sides respectively, the upper and lower ends of the chair legs are fixedly connected to the connecting rod and the rear end of the arc-shaped rocker respectively, and the front end of the arc-shaped rocker is fixedly connected to the front end of the connecting rod. The arc-shaped rockers, connecting rods and chair legs on the left and right sides are fixedly connected to form a symmetrical frame structure, and are fixedly connected by the top and lower horizontal axes and the foot pedal, and the front part is rotatably connected to the locking shaft; a locking groove is provided at the junction of the arc-shaped rocker and the connecting rod, and a positioning hole and an angle locking block are provided in the middle of the arc-shaped rocker; the angle locking blocks are respectively embedded in the positioning holes and can be plugged in, pulled out and rotated.

[0017] Preferably, when the first leg frame and the second leg frame are cross-folded, the inclination of the chair legs can be adjusted by connecting the corresponding positioning grooves and positioning holes of the two leg frames using an angle locking block, and the connection can be locked by rotating the angle locking block; when the first leg frame and the second leg frame are fully unfolded, the clamping shaft at the rear of the first leg frame falls into the locking groove of the second leg frame, and both ends of the locking shaft of the second leg frame fall into the locking groove of the first leg frame, and rotating the locking shaft can lock the connection or release the connection between the two leg frames; when the first leg frame and the second leg frame are fully unfolded, the leg part forms a rocking chair shape, and when the first leg frame and the second leg frame are folded, the leg part forms a sitting shape.

[0018] Preferably, the seat frame, back frame, first leg frame and second leg frame are all frame structures. The backrest refers to the seat ring, back frame and their accessories, the seat refers to the seat frame and its accessories, the leg part refers to the first leg frame, second leg frame and connecting rod bracket and their accessories, and the locking mechanism refers to the components with locking function including: locking block, locking shaft, angle locking block, locking pin and its matching mechanism.

[0019] A function conversion method based on the above multifunctional chair frame structure is as follows:

[0020] The multifunctional chair has a backrest angle that can be converted into a sitting position or a semi-lying position, a chair leg part that can be converted into a sitting position or a rocking position, a detachable chair ring and a chair back frame, an adjustable height and pitch angle of the chair seat, and an adjustable inclination of the chair legs. Through simple adjustment and combination, the chair can be converted into an armchair, a square stool, a reclining chair, a rocking chair, and a leisure chair.

[0021] When the backrest frame is connected to the seat ring, the backrest forms a sitting position; when the seat ring and the backrest frame are disconnected, they are flipped backwards until the bottom fulcrum supports the seat frame, and the rear end of the seat ring can support the backrest frame, and the backrest frame is flipped backwards to lean against the rear end of the seat ring, so that the backrest forms a semi-lying position;

[0022] The first chair leg frame and the second chair leg frame are folded together, the positioning grooves and the positioning holes are aligned, the angle locking block is inserted, and the angle locking block is rotated and locked, and the chair leg part is formed into a sitting position; after the first chair leg frame and the second chair leg frame are fully unfolded, the clamping shaft at the rear of the first chair leg frame falls into the locking groove of the second chair leg frame, and the two ends of the locking shaft of the second chair leg frame fall into the locking groove of the first chair leg frame, and the locking shaft is rotated to lock the connection between the two chair leg frames, and the chair leg part is formed into a rocking chair shape;

[0023] Lift the rear end of the seat ring upwards to pull out the tenon on the upper part of the seat back frame from the rear end of the seat ring, pull out the locking pins of all the pivot connectors in the connected state, and then pull out the seat ring and seat back frame connected to them from the pivot connectors respectively, and turn the hole of the pivot connector to the inside to complete the disassembly of the seat ring and the seat back frame;

[0024] The lower end of the shift bracket is plugged into any group of gear slots of the connecting rod bracket and locked by a locking block. By changing the connection between the shift bracket and different gear slots of the connecting rod bracket, the height and pitch angle of the seat can be adjusted;

[0025] When the first chair leg frame and the second chair leg frame are crossed and folded, the angle locking block is used to connect the corresponding positioning grooves and positioning holes of the two chair leg frames. By connecting different positioning grooves and positioning holes, the inclination of the chair legs can be adjusted and the angle locking block can be rotated to lock the connection;

[0026] Through adjustment and combination, the functions of armchair, square stool, reclining chair, rocking chair and leisure chair can be converted. When the backrest angle and the chair legs are in a sitting state, the whole is in an armchair state. The chair ring and the backrest frame can be removed and the pivot connection piece can be rotated until the hole is hidden inside to convert it into a square stool state; when the backrest angle is in a semi-reclining state and the chair legs are in a sitting state, the whole is converted into a reclining chair state; when the backrest angle is in a semi-reclining state and the chair legs are in a rocking chair state, the whole is converted into a rocking chair state; when the backrest angle is in a sitting state and the chair legs are in a rocking chair state, the whole is converted into a leisure chair state.

[0027] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0028] 1. The multifunctional chair frame structure of the present invention can be flipped, supported and quickly disassembled through the pivot connections at the front and rear ends of the seat frame, so that the chair ring and the chair back frame can be flipped and quickly disassembled; that is, when the user disconnects the chair back frame and the chair ring, the chair ring and the chair back frame can be flipped backwards, thereby quickly switching to a semi-lying posture; the user can choose to disassemble the chair ring and the chair back frame to make the whole into a square stool state, and the pivot connection can be rotated to hide the hole on the inside. The structure is ingenious and can bring users a good operating experience.

[0029] 2. The user can adjust the height and pitch angle of the seat by adjusting the connection between the shift bracket and the different gear slots of the connecting rod bracket. The user can adjust the height and pitch angle of the seat according to his or her height requirements so that the seat can be tilted horizontally and forward and backward to meet the needs of users in different scenarios and physical conditions such as office, study, work, leisure, and dining.

[0030] 3. In order to realize the functional conversion from the sitting and standing use state to the rocking chair use state, the technical scheme combines the upright chair legs with the arc-shaped rocker and forms two sets of front and rear symmetrical chair leg frames through the connecting rod. When the two sets of chair leg frames are crossed and folded, the lower ends of the chair legs touch the ground. When the two sets of chair leg frames are fully unfolded, the locking grooves of the two sets of chair leg frames are intersected and the bottom surfaces of the two arc-shaped rocker arms form a continuous arc. In order to solve the problem of the firm connection between the two arc-shaped rocker arms in the rocking chair state, the scheme adopts a cross-clamping structure. The clamping shaft at the rear end of the first chair leg frame presses the locking groove of the second chair leg frame, and the locking shaft of the second chair leg frame presses the locking groove of the first chair leg frame to form a firm connection, which can keep the arc-shaped bottom surface of the connection between the two arc-shaped rocker arms smooth and stable.

[0031] 4. The main components of this technical solution adopt relatively independent modular structures and traditional component forms. The backrest and armrest parts, the seat part, and the leg frame part can be quickly disassembled, so that the combination form is relatively flexible and changeable during the use of the multifunctional chair, which is convenient for product upgrades and function conversions. The use of traditional component forms can improve the reliability and service life of the product, while reducing the difficulty of production and processing. 5. This technical solution adopts a one-chair-multiple-purpose technical solution, so that users do not need to change seats when they need different sitting postures during use to meet their sitting posture needs, thereby reducing the occupation of indoor space due to multiple different forms of seat needs, making this technical solution more humane and conducive to wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional structural schematic diagram of the multi-functional chair in an armchair state in an embodiment of the present invention;

[0033] Figure 2 is a three-dimensional structural schematic diagram of the multi-functional chair in the embodiment of the present invention in a rocking chair state;

[0034] Figure 3 for Figure 2 A magnified view of the part A in the middle;

[0035] Figure 4 A bottom view of the three-dimensional structure of the multi-functional chair in the embodiment of the present invention in the armchair state;

[0036] Figure 5is a three-dimensional structural schematic diagram of the multi-functional chair in a reclining state in an embodiment of the present invention;

[0037] Figure 6 It is a three-dimensional structural schematic diagram of the multi-functional chair in the embodiment of the present invention in a square stool state;

[0038] Figure 7 It is a schematic diagram of the three-dimensional structure of the seat frame, the seat ring, the seat back frame and the shift bracket in the embodiment of the present invention;

[0039] Figure 8 It is a bottom view of the three-dimensional structure of the seat frame, the seat ring, the seat back frame and the shift bracket in the embodiment of the present invention;

[0040] Fig. 9 is an enlarged view of the pivot connection member in an embodiment of the present invention;

[0041] Fig.10 It is a schematic diagram of the exploded three-dimensional structure of the connecting rod bracket of the multi-functional chair in the embodiment of the present invention;

[0042] Fig.11 An enlarged view of a locking block in an embodiment of the present invention;

[0043] Fig.12 An enlarged view of the angle locking block in the embodiment of the present invention;

[0044] Fig.13 It is a side view of the multi-functional chair in an embodiment of the present invention, in which the seat is in a tilted state and the tilt angle of the chair legs is adjusted backward.

[0045] Fig.14 Schematic diagram of the three-dimensional structure of the first leg frame of the multi-functional chair in an embodiment of the present invention;

[0046] Fig.15 It is a schematic diagram of the exploded three-dimensional structure of the second leg frame of the multi-functional chair in an embodiment of the present invention;

[0047] Fig.16 A side view of the multifunctional chair in the embodiment of the present invention when the seat is in the lowest position when the chair is in the armchair state;

[0048] Fig.17 A side view of the multifunctional chair in the embodiment of the present invention when the seat is in the highest position when the chair is in the armchair state;

[0049] Fig.18 A side view of the multifunctional chair in the embodiment of the present invention when it is in a leisure chair state;

[0050] Fig.19 is a schematic diagram of the three-dimensional structure of a chair leg module in an embodiment of the present invention;

[0051] Fig. 20 is a schematic diagram of the three-dimensional structure of the seat module in an embodiment of the present invention;

[0052] Fig.21 Schematic diagram of the three-dimensional structure of the chair ring in the embodiment of the present invention;

[0053] Fig. 22 It is a side view of the multi-functional chair in the embodiment of the present invention in the rocking chair state.

[0054] The figures are marked as follows: seat frame 1; pivot connection 101; shaft seat 102; seat ring 2; fulcrum 201; seat back frame 3; shift bracket 4; swing arm shaft 401; swing arm 402; connecting rod bracket 5; outer plate 501; inner plate 502; locking block 503; first chair leg frame 6; angle positioning groove 601; second chair leg frame 7; positioning hole 701; angle locking block 702; mortise 11; locking pin 12; tenon 13; mounting hole 14; chair leg 15; arc rocker 16; connecting rod 17; horizontal axis 18; foot pedal 19; clamping shaft 20; locking shaft 21; locking groove 22; pin hole 23; shallow groove 24; gear slot 25; positioning pin 26; spring 27; spring positioning pin 28. DETAILED DESCRIPTION

[0055] The preferred embodiments of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0056] In the description of the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0057] The present invention is further described in detail below with reference to the accompanying drawings and implementation examples. The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the respective drawings, and the words "inside" and "outside" refer to the directions toward or away from the geometric center of the seat, respectively, which are relative concepts, and therefore these or other directional terms should not be interpreted as restrictive terms.

[0058] The specific implementation methods of the present invention are as follows:

[0059] Reference Figure 1-22 The present invention provides a multifunctional chair frame structure, including a seat frame 1, a seat ring 2, a seat back frame 3, a shift bracket 4, a connecting rod bracket 5, a first chair leg frame 6, and a second chair leg frame 7; Fig. 20 As shown, the seat frame 1 is rotatably connected to the shift bracket 4 and forms a set of independent seat modules that can be separated from the main body; Fig.19As shown, the connecting rod bracket 5 is rotatably connected with the first chair leg frame 6 and the second chair leg frame 7 to form a set of independent chair leg modules that can be separated from the main body; the chair ring 2 and the chair back frame 3 are installed above the seat frame 1, and the chair ring 2 and the chair back frame 3 are detachably rotatably connected with the seat frame 1 through the pivot connection member 101; Fig.18 When the backrest is in a sitting position, the seat ring 2 is plugged into the seat back frame 3, and the seat back frame 3 supports the rear of the seat ring 2; Fig. 22 When the backrest is in a semi-reclining state, the seat ring 2 is disconnected from the seat back frame 3 and flipped backward until the bottom fulcrum 201 of the seat ring 2 is supported on the frames on both sides of the seat frame 1, and the seat back frame 3 flips backward and leans on the rear part of the seat ring 2, and the rear part of the seat ring 2 supports the seat back frame 3; Fig.13 When the chair leg part is in a sitting state: the first chair leg frame 6 and the second chair leg frame 7 are in a folded state; Fig. 22 When the chair leg part is in the rocking chair state: the first chair leg frame 6 and the second chair leg frame 7 are in a fully expanded state, the bottom of the arc-shaped rocker 16 is supported on the ground and forms a rolling contact with the ground, and can be locked by the locking mechanism in both the rocking chair state and the sitting state.

[0060] Reference Fig.18 , 7 , 8, 22, such as Figure 8 As shown, the chair back frame 3 is a frame structure, provided with a tenon 13 adapted to the pivot connection 101 and a tenon 13 adapted to the mortise 11 at the rear of the seat ring 2; the bottom end of the chair back frame 3 forms a detachable rotatable connection with the seat frame 1 through the pivot connection 101; the chair back frame 3 and the pivot connection 101 at the rear end of the seat frame 1 are in a plug-in form, and can be locked or unlocked by a locking pin 12, which is locked when the locking pin 12 is inserted and unlocked when it is pulled out. The chair back frame 3 maintains left-right balance during use and restricts the chair ring 2 from sliding left-right. The user can quickly switch to a sitting position or a semi-lying position by inserting and pulling out the connection between the upper part of the chair back frame 3 and the rear of the seat ring 2.

[0061] Reference Figure 1 , 21 The front sides of the chair circle 2 extend downward respectively and are provided with tenons 13 at the ends, and are adapted to the pivot connection piece 101 at the front end of the seat frame 1. The middle part of the chair circle 2 is bent downward, and the bottom of the bent part in the middle serves as the fulcrum 201 of the chair circle 2 in a semi-lying state, and the rear end is provided with a mortise 11 adapted to the tenon 13 on the upper part of the seat back frame 3; the chair circle 2 is detachably connected to the seat frame 1 through the pivot connection pieces 101 on both sides of the front end of the seat frame 1; the tenons 13 on both sides of the front part of the chair circle 2 are in a plug-in form with the pivot connection piece 101, and can be locked or unlocked by a locking pin 12, which is locked when the locking pin 12 is inserted and unlocked when it is pulled out.

[0062] Reference Figure 1 , 16 22, when the backrest is in a sitting position, the rear portion of the seat ring 2 and the upper portion of the seat back frame 3 are in a plug-in state, and the seat back frame 3 supports the rear portion of the seat ring 2; Fig. 22 As shown, when the seat ring 2 and the chair back frame 3 are disconnected, they are flipped backwards until the fulcrum 201 at the bottom is supported on the frames on both sides of the seat frame 1. The rear end of the seat ring 2 can be used as a support for the chair back frame 3. The chair back frame 3 is flipped backwards and leans against the rear end of the seat ring 2, forming a semi-lying position.

[0063] Reference Figure 7 , 8 20. The seat frame 1 is a frame structure, and the hollow part can be used to install ropes, seat panels, seat cushions or other supporting parts for supporting the seat cushion. Corresponding holes and grooves can be opened in the frame according to different seat support forms. The front and rear ends of the seat frame 1 are provided with a plurality of pivot connectors 101 embedded in the frame and capable of flipping, and the front and rear ends of the bottom are respectively provided with shaft seats 102 connected to the shift bracket 4; the axis lines of the pivot connectors 101 at the front and rear ends of the seat frame 1 are parallel to each other, and the pivot connectors 101 adopt an embedded connection method to make the shape close to the seat frame 1 as a whole, and after disassembling the corresponding connectors, the connection holes can be rotated to the inside to be hidden, so that the shape of the seat frame 1 remains smooth and beautiful.

[0064] Reference Figure 8 , 10 , 17, 20, the lower part of the seat frame 1 is rotatably connected to the front and rear shift brackets 4 respectively, and both ends of the swing arm shaft 401 of the shift bracket 4 can be rotatably embedded in the shaft seat 102 at the lower part of the seat frame 1, so that the shift bracket 4 can swing back and forth relative to the axis of the shaft seat 102.

[0065] Reference Figure 1 , 2 , 6, 9, the pivot connector 101 is provided with a mortise 11 and a pin hole 23, the pivot connector 101 includes a locking pin 12, the mortise 11 is slidably matched with the tenon 13 of the connected component, the locking pin 12 is slidably matched with the pin hole 23, and this method allows the user to quickly pull out the connected component without additional tools, the pin hole 23 is provided with a shallow groove 24 for removing the locking pin 12, the locking pin 12 is locked when inserted and unlocked when pulled out, so that the connected chair ring 2 and chair back frame 3 can be quickly disassembled, the pivot connector 101 adopts a pin hole locking form, such as Figure 2 As shown, the opening of the pin hole 23 is in a hidden state when the backrest is in a sitting state and the whole is in a square stool state, and the opening faces upward when the backrest is in a semi-lying state. This method can prevent the locking pin 12 from slipping during use.

[0066] Reference Figure 7 , 8 , 16, 13, the shift bracket 4 is composed of a swing arm shaft 401 and swing arms 402 on both sides, and is rotatably connected to the front and rear axle seats 102 at the bottom of the seat frame 1 through the swing arm shaft 401, and can be flipped forward and backward along the axis of the axle seat 102. The lower end of the shift bracket 4 is detachably connected to any group of gear slots 25 of the connecting rod bracket 5 and locked by a locking block 503. By changing the connection between the shift bracket 4 and different gear slots 25 of the connecting rod bracket 5, the height and pitch angle of the seat can be adjusted. The swing arm 402 is provided with a protrusion that matches the gear slot 25 of the connecting rod bracket 5 to prevent the connecting rod bracket 5 from being accidentally pulled out.

[0067] Reference Fig.10 , 19 , 11, the connecting rod bracket 5 includes an outer plate 501, an inner plate 502, a locking block 503, and a spring 27. The outer plate 501 and the inner plate 502 are respectively provided with mounting holes 14 at both ends. The outer plate 501 is provided with a plurality of gear slots 25 and positioning pins 26. The inner plate 502 can slide axially along the positioning pins 26. The spring 27 is located between the inner plate 502 and the spring positioning pins 28 to provide a continuous thrust for the inner plate 502 to move outward, so that the inner plate 502 can automatically fit with the outer plate 501; Fig.10 , 16 , 17, 13, the front end and the rear end of the connecting rod bracket 5 are respectively rotatably connected to the upper ends of the first chair leg frame 6 and the second chair leg frame 7, and the connecting rod bracket 5 is bilaterally symmetrical; the locking blocks 503 are respectively rotatably connected to the transverse axis 18 at the upper ends of the first chair leg frame 6 and the second chair leg frame 7, such as Fig.11 As shown, the locking block 503 is provided with a groove, and when the groove of the locking block 503 is aligned with the positioning pin on the horizontal axis 18, it is in an unlocked state. Rotating the locking block 503 can push the inner plate 502 and the outer plate 501 to fit together and lock the connection with the shift bracket 4.

[0068] Reference Fig.16 , 22 The first chair leg frame 6 and the second chair leg frame 7 are installed at the lower part of the connecting rod bracket 5, and when the first chair leg frame 6 and the second chair leg frame 7 are folded, the bottom of the chair leg 15 is supported on the ground, and when the first chair leg frame 6 and the second chair leg frame 7 are unfolded, the bottom of the arc rocker 16 is supported on the ground and forms a rolling contact with the ground.

[0069] Reference Figure 2 , 14The first chair leg frame 6 is a bilaterally symmetrical structure, with chair legs 15, arc-shaped rockers 16 and connecting rods 17 on the left and right sides respectively. The upper and lower ends of the chair legs 15 are fixedly connected to the connecting rod 17 and the front end of the arc-shaped rocker 16 respectively, and the rear end of the arc-shaped rocker 16 is fixedly connected to the rear end of the connecting rod 17. The arc-shaped rockers 16, connecting rods 17 and chair legs 15 on the left and right sides are fixedly connected to form a symmetrical frame structure. The top, rear and lower parts of the frame structures on both sides of the first chair leg frame 6 are fixedly connected to the horizontal axis 18, the clamping axis 20 and the foot pedal 19 respectively; locking grooves 22 are provided at the intersection of the arc-shaped rockers 16 and the connecting rods 17 on both sides of the first chair leg frame 6, and multiple angle positioning grooves 601 are provided on the inner side of the middle part of the arc-shaped rockers 16 on both sides of the first chair leg frame 6.

[0070] Reference Fig.15 , 12 3. The second chair leg frame 7 is a bilaterally symmetrical structure, with chair legs 15, arc-shaped rocker arms 16 and connecting rods 17 on the left and right sides respectively. The upper and lower ends of the chair legs 15 are fixedly connected to the connecting rod 17 and the rear ends of the arc-shaped rocker arms 16 respectively, and the front end of the arc-shaped rocker arms 16 is fixedly connected to the front end of the connecting rod 17. The arc-shaped rocker arms 16, connecting rods 17 and chair legs 15 on the left and right sides are fixedly connected to form a symmetrical frame structure. The top and lower parts of the frame structures on both sides of the second chair leg frame 7 are fixedly connected to the transverse axis 18 and the foot pedal 19 respectively, and the front part is rotatably connected to the locking shaft 21; locking grooves 22 are provided at the intersections of the arc-shaped rocker arms 16 and the connecting rods 17 on both sides of the second chair leg frame 7, and a plurality of positioning holes 701 and angle locking blocks 702 are provided in the middle of the arc-shaped rocker arms 16 on both sides of the second chair leg frame 7; the angle locking blocks 702 are respectively embedded in the positioning holes 701 and can be plugged in and out and rotated, such as Fig.12 The angle locking block 702 shown is provided with a protrusion matching the positioning hole 701 to prevent accidental pulling out.

[0071] Reference Figure 2 , 3 When the first chair leg frame 6 and the second chair leg frame 7 are fully unfolded, the clamping shaft 20 at the rear of the first chair leg frame 6 falls into the locking groove 22 of the second chair leg frame 7, and the two ends of the locking shaft 21 of the second chair leg frame 7 fall into the locking groove 22 of the first chair leg frame 6. The locking shaft 21 is rotated so that the arc surfaces at both ends fit with the arc surfaces of the locking groove 22 of the first chair leg frame 6 to achieve a locking connection.

[0072] Reference Figure 4 , 1713. When the first chair leg frame 6 and the second chair leg frame 7 are cross-folded, the angle locking block 702 is used to connect the corresponding positioning grooves 601 and positioning holes 701 of the two chair leg frames and lock the connection. Connecting different positioning grooves 601 and positioning holes 701 can change the folding angle of the first chair leg frame 6 and the second chair leg frame 7, thereby realizing the adjustment of the chair leg angle. Specifically, it means that the user cross-folds the first chair leg frame 6 and the second chair leg frame 7, aligns any positioning grooves 601 and positioning holes 701 on both sides, and then inserts the angle locking blocks 702 on both sides and rotates to lock.

[0073] The seat frame 1, the back frame 3, the first leg frame 6, and the second leg frame 7 are all frame structures. The backrest refers to the seat ring 2, the back frame 3 and their accessories, the seat refers to the seat frame 1 and its accessories, and the leg part refers to the first leg frame 6, the second leg frame 7 and the connecting rod bracket 5 and their accessories. The locking mechanism refers to the locking block 503, the locking shaft 21, the angle locking block 702, the locking pin 12 and their matching mechanism.

[0074] In summary, when the multifunctional chair frame structure is subsequently used, the function conversion method is as follows:

[0075] Reference Figure 1-22 The multifunctional chair has the following characteristics: the backrest angle can be converted into a sitting state or a semi-lying state, the chair leg part can be converted into a sitting state and a rocking chair state, the chair ring 2 and the chair back frame 3 are detachable, the height and pitch angle of the seat can be adjusted, and the inclination of the chair leg 15 can be adjusted. Through simple adjustment and combination, the use states of an armchair, a square stool, a reclining chair, a rocking chair, and a leisure chair can be switched.

[0076] Reference Fig.16 , 22 The function conversion method of the backrest angle from the sitting position to the semi-lying position is as follows: Fig.16 As shown, after the backrest frame 3 is connected to the seat ring 2, the backrest angle forms a sitting position, specifically, the tenon 13 at the upper part of the backrest frame 3 is plugged into the mortise 11 at the rear part of the seat ring 2, the tenons 13 at both sides of the front part of the seat ring 2 are respectively plugged into the pivot connector 101 at the front end of the seat frame 1, and the tenons 13 at both sides of the lower end of the backrest frame 3 are plugged into the pivot connector 101 at the rear end of the seat frame 1; Fig. 22 As shown, when the seat ring 2 and the seat back frame 3 are disconnected and flipped backward to the bottom fulcrum 201 to support the seat frame 1, the rear end of the seat ring 2 supports the seat back frame 3, and the seat back frame 3 is flipped backward to lean against the rear end of the seat ring 2, the backrest angle forms a semi-lying state.

[0077] Reference Figure 2 , 3 , 4, 19, the function conversion method of the chair leg part between the sitting form and the rocking form: Fig.19As shown, the first chair leg frame 6 and the second chair leg frame 7 are folded together, the positioning groove 601 and the positioning hole 701 are aligned, the angle locking block 702 is inserted, and the angle locking block 702 is rotated and locked, so as to form a sitting posture; Figure 2 As shown, after the first leg frame 6 and the second leg frame 7 are fully unfolded, the clamping shaft 20 at the rear of the first leg frame 6 falls into the locking groove 22 of the second leg frame 7, and both ends of the locking shaft 21 of the second leg frame 7 fall into the locking groove 22 of the first leg frame 6, and the locking shaft 21 is rotated to lock the connection between the two leg frames, thereby forming a rocking chair shape; in the rocking chair shape, the user can make the seat rock back and forth through slight body movements during use.

[0078] Reference Fig.18 , 6 22. Method for disassembling the seat ring 2 and the seat back frame 3: lift the rear end of the seat ring 2 upwards to pull out the tenon 13 on the upper part of the seat back frame 3 from the rear end of the seat ring 2, pull out the locking pins 12 of all the pivot connectors 101 in a connected state, and then pull out the seat ring 2 and seat back frame 3 connected thereto from the pivot connector 101 respectively, and turn the hole of the pivot connector 101 to the inside to complete the disassembly.

[0079] Reference Fig.10 , 13 20. Method for adjusting the height and pitch angle of the seat: plug the lower end of the shift bracket 4 into any group of gear slots 25 of the connecting rod bracket 5, and rotate the locking block 503 to lock the connection. By changing the connection between the shift bracket 4 and the different gear slots 25 of the connecting rod bracket 5, the height and pitch angle of the seat can be adjusted.

[0080] Reference Figure 4 , 14 , 15, 13, method for adjusting the inclination of the chair leg 15: when the first chair leg frame 6 and the second chair leg frame 7 are crossed and folded, an angle locking block 702 is used to connect the corresponding positioning grooves 601 and positioning holes 701 of the two chair leg frames. By connecting different positioning grooves 601 and positioning holes 701, the inclination of the chair leg 15 can be adjusted and the angle locking block 702 can be rotated to lock the connection.

[0081] Reference Figure 1-22 Through adjustment and combination, the functions of armchair, square stool, recliner, rocking chair and leisure chair can be transformed. Figure 1 As shown in FIG. 1 , when the backrest angle and the chair legs are in a sitting position, the whole chair is in an armchair usage state, such as Figure 6 As shown, the chair ring 2 and the chair back frame 3 are removed and the pivot connection member 101 is rotated until the hole is hidden inside to convert the chair into a square stool. Figure 5 As shown, the backrest is in a semi-reclining position, and the chair legs are in a sitting position, and the whole chair is converted into a reclining position; Fig. 22 As shown, the backrest is in a semi-lying position, and the chair legs are in a rocking chair position, and the whole chair is converted into a rocking chair state; Fig.18 As shown, the backrest is angled in a sitting position, and the chair legs are in a rocking position, so that the whole is converted into a leisure chair.

[0082] The above is a schematic description of the present invention and its implementation methods, which is not restrictive. The drawings show only one implementation method of the present invention, and the actual structure and function are not limited thereto. Therefore, if a person skilled in the art is inspired by it and, without departing from the purpose of the invention, designs a structure and an implementation method similar to the technical solution without creativity, they should all fall within the protection scope of the present invention.

Claims

1. A multifunctional chair frame structure, characterized in that: The invention comprises a seat frame, a seat ring, a seat back frame, a shift bracket, a connecting rod bracket, a first chair leg frame and a second chair leg frame; the seat ring and the seat back frame are installed on the upper part of the seat frame, and the seat ring is detachably and rotatably connected to the front end of the seat frame by a pivot connection piece; the bottom end of the seat back frame is detachably and rotatably connected to the rear end of the seat frame by a pivot connection piece; when the backrest is in a sitting state, the seat back frame and the rear end of the seat ring are detachably plugged in, and the seat back frame forms a support for the rear part of the seat ring; when the backrest is in a semi-lying state, the connection between the seat back frame and the seat ring is disconnected, and the seat ring is flipped backward until the fulcrum at the bottom of the seat ring is supported on the frames on both sides of the seat frame, and the seat back frame is flipped backward and leans on the rear part of the seat ring, and the rear part of the seat ring forms a support for the seat back frame; the lower part of the seat frame is respectively rotated with the front and rear two shift brackets The lower end of the shift bracket is respectively plugged into the connecting rod brackets on the left and right sides and locked by a locking block. The connecting rod bracket is provided with a plurality of gear slots. The height and pitch angle of the seat can be adjusted by changing the connection between the shift bracket and the different gear slots of the connecting rod bracket; the front end and the rear end of the connecting rod bracket are respectively rotatably connected to the first chair leg frame and the second chair leg frame, and the connecting rod bracket is symmetrical on the left and right; the installation position of the first chair leg frame and the second chair leg frame is at the lower part of the connecting rod bracket, and when the first chair leg frame and the second chair leg frame are folded, the bottom of the chair leg is supported on the ground to form a sitting shape, and when they are unfolded, a rocking chair shape is formed, the bottom of the arc-shaped rocker is supported on the ground and forms a rolling contact with the ground, and is locked by an angle locking block in both the rocking chair shape and the sitting shape.

2. The multifunctional chair frame structure according to claim 1, characterized in that: The front and rear ends of the seat frame are provided with a plurality of pivot connectors embedded in the frame and capable of being flipped over. The front and rear ends of the bottom are symmetrically provided with axle seats for connecting the shift bracket. The axis center lines of the pivot connectors at the front and rear ends of the seat frame are parallel to each other. The pivot connectors are provided with mortises and pin holes, and the mortises are matched with the tenons of the connected components. The pivot connectors include locking pins, which are locked when inserted into the pin holes and unlocked when pulled out, so that the connected chair ring and chair back frame can be quickly disassembled. The pivot connectors adopt a pin hole locking form.

3. The multifunctional chair frame structure according to claim 1, characterized in that: The bottom end of the chair back frame is detachably and rotatably connected to the rear end of the seat frame through a pivot connection piece; the chair back frame is provided with a tenon matched with the pivot connection piece and a tenon matched with the mortise at the rear of the seat ring; the chair back frame is plugged into the pivot connections on both sides of the rear end of the seat frame and can be locked or unlocked by a locking pin.

4. The multifunctional chair frame structure according to claim 1, characterized in that: The two sides of the front part of the chair circle extend downward respectively and the ends are provided with tenons adapted to the pivot connecting parts. The middle part of the chair circle is bent downward, and the bottom of the downward bent parts in the middle of both sides serves as the fulcrum of the chair circle when in the rocking chair form. The rear end is provided with mortise eyes adapted to the tenons on the upper part of the chair back frame. The chair circle is detachably and rotatably connected to the front end of the seat frame through the pivot connecting part, and the tenons on both sides of the front part of the chair circle are plugged into the pivot connecting part at the front end of the seat frame.

5. The multifunctional chair frame structure according to claim 1, characterized in that: The chair ring and the chair back frame are installed above the seat frame. When the chair back frame is connected to the chair ring, the backrest is formed into a sitting shape. When the chair ring and the chair back frame are disconnected, they are flipped backwards until the bottom fulcrum supports the seat frame. The rear end of the chair ring supports the chair back frame. The chair back frame is flipped backwards to lean against the rear end of the chair ring, so that the backrest is formed into a semi-lying shape.

6. The multifunctional chair frame structure according to claim 1, characterized in that: The connecting rod bracket includes an outer plate, an inner plate, a locking block, and a spring, and mounting holes are respectively provided at both ends of the outer plate and the inner plate. The outer plate is provided with a plurality of gear slots, positioning pins, and spring positioning pins. The inner plate can slide axially along the positioning pins, and the spring provides a continuous outward thrust for the inner plate so that the inner plate can automatically fit with the outer plate; the transverse axes at the upper ends of the first chair leg frame and the second chair leg frame are respectively rotatably connected to the locking block, and the locking block is provided with a groove, which is in an unlocked state when the locking block groove is aligned with the positioning pin on the transverse axis. Rotating the locking block can push the inner plate to fit with the outer plate and lock the connection with the shift bracket.

7. The multifunctional chair frame structure according to claim 1, characterized in that: The shift bracket is composed of a swing arm shaft and swing arms fixedly connected at both ends, and is rotatably connected to the front and rear axle seats at the bottom of the seat frame through the swing arm shaft, and can be flipped forward and backward along the axis of the axle seat. The lower end of the shift bracket is detachably plugged into any group of gear slots of the connecting rod bracket and locked by a locking block.

8. The multifunctional chair frame structure according to claim 1, characterized in that: The first chair leg frame is a symmetrical structure, with chair legs, arc-shaped rockers and connecting rods on the left and right sides respectively. The upper and lower ends of the chair legs are fixedly connected to the connecting rod and the front end of the arc-shaped rocker respectively, and the rear end of the arc-shaped rocker is fixedly connected to the rear end of the connecting rod. The arc-shaped rockers, connecting rods and chair legs on the left and right sides are fixedly connected to form a symmetrical frame structure, and the top, rear and lower parts of the frame structures on both sides are fixedly connected to the horizontal axis, the clamping axis and the foot pedal respectively; a locking groove is provided at the junction of the arc-shaped rocker and the connecting rod, and a plurality of angle positioning grooves are provided on the inner side of the middle part of the arc-shaped rocker, and are used to adjust and fix the inclination of the chair legs when the first chair leg frame and the second chair leg frame are folded.

9. The multifunctional chair frame structure according to claim 1, characterized in that: The second chair leg frame is a symmetrical structure, with chair legs, arc-shaped rockers and connecting rods on the left and right sides respectively. The upper and lower ends of the chair legs are fixedly connected to the connecting rod and the rear end of the arc-shaped rocker respectively, and the front end of the arc-shaped rocker is fixedly connected to the front end of the connecting rod. The arc-shaped rockers, connecting rods and chair legs on the left and right sides are fixedly connected to form a symmetrical frame structure, and are fixedly connected by the top and lower transverse axes and the foot pedal, and the front is rotatably connected to the locking shaft; a locking groove is provided at the junction of the arc-shaped rocker and the connecting rod, and a positioning hole and an angle locking block are provided in the middle of the arc-shaped rocker; the angle locking blocks are respectively embedded in the positioning holes and can be plugged in, pulled out and rotated.

10. The multifunctional chair frame structure according to claim 1, characterized in that: When the first chair leg frame and the second chair leg frame are cross-folded, the inclination of the chair legs can be adjusted by connecting the corresponding positioning grooves and positioning holes of the two chair leg frames using an angle locking block, and the angle locking block can be rotated to lock the connection; when the first chair leg frame and the second chair leg frame are fully unfolded, the clamping shaft at the rear of the first chair leg frame falls into the locking groove of the second chair leg frame, and the two ends of the locking shaft of the second chair leg frame fall into the locking groove of the first chair leg frame, and rotating the locking shaft can lock the connection or release the connection between the two chair leg frames; when the first chair leg frame and the second chair leg frame are fully unfolded, the chair leg part forms a rocking chair shape, and when the first chair leg frame and the second chair leg frame are folded, the chair leg part forms a sitting shape.

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