Back support connection structure, and chair

Abstract

A back support connection structure and a chair. The back support connection structure comprises a chair back connection portion (1), and a transverse portion (3) configured to be connected to a seat frame (4) in a manner of sliding forwards and backwards, wherein the transverse portion (3) is connected to left and right symmetrical support arms (2) on the chair back connection portion (1) by means of screws. By means of designing such a split structure, the transverse portion (3) can be connected to the seat frame (4) in a sliding manner in advance. Thus, when the back support connection structure is applied to the chair, the chair back connection portion (1) of the back support connection structure can be individually packaged and transported, and meanwhile, the transverse portion (3) can also be connected to the seat frame (4) in a sliding manner in advance as a whole prior to being packaged and transported, thereby reducing the size and cost of the chair during packaging and transportation. Moreover, the chair back connection portion (1) can be mounted to the transverse portion (3) only needing a user to simply assemble screws, thereby completing the assembly of the chair, such that the assembly difficulty of the chair is reduced, thus the use experience of the chair is improved.

Description

A back support connection structure and a seat Technical Field

[0001] This invention relates to the field of seating, and particularly to a backrest support and a seat. Background Technology

[0002] As a seating device that accompanies children in their studies, the study chair plays an important role in children's growth and learning process. Study chairs usually have the function of adjusting the seat depth, so that the chair can be used by children of different ages.

[0003] An existing type of study chair uses a sliding backrest support to adjust the distance between the backrest and the front edge of the seat. The seat includes a seat frame and a cushion mounted on the seat frame. The backrest includes a back support and a backrest bracket for connecting to the back support. This chair's structural design is achieved through symmetrical connecting parts extending from the left and right sides of the backrest bracket. The two connecting parts extend towards each other in the left-right direction and insert into the left and right sides of the seat frame, and slide in the front-back direction inside the seat frame. When the seat depth needs to be adjusted, the sliding connecting parts can change the distance between the backrest and the front edge of the seat frame to achieve seat depth adjustment. However, this structural design has shortcomings.

[0004] Before the chair leaves the factory, if workers insert the corresponding connecting parts into the seat for sliding connection and assembly, and then install the seat cushion to assemble the back support and seat into a whole, the back support will extend too far upwards, making the chair take up too much space and increasing the transportation cost. Therefore, it is necessary to separate the back support and seat frame and pack them separately. Although packing the back support and seat frame for transportation saves transportation costs, when the user receives the chair, the back support and seat frame are in a separate state. For the user, reinstalling the back support on the seat requires removing the seat cushion from the seat frame again and then sliding it together. This operation is difficult and the installation process is cumbersome, affecting the user experience of the chair. Technical issues

[0005] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a back support connection structure, wherein the back support and the lateral part are separate and can be disassembled and assembled by screws. This separate structure design allows the lateral part to be pre-slidably connected to the seat frame.

[0006] Furthermore, a seat is provided in which the backrest support connection structure is applied. The backrest connection part of the backrest support connection structure can be packaged and transported separately, while the lateral part can also be pre-slidably connected to the seat frame as a whole before being packaged and transported, saving the volume and cost of packaging and transporting the seat. Moreover, the user only needs to install the backrest connection part on the lateral part with simple screw assembly to complete the assembly of the seat, reducing the assembly difficulty of the seat and improving the user experience of the seat. Technical solutions

[0007] The technical solution of this invention is implemented as follows:

[0008] A back support connection structure, comprising:

[0009] The backrest connection has symmetrical support arms that extend forward and downward.

[0010] The transverse section is configured as a transition carrier for sliding connection between the support arm and the seat frame;

[0011] The back support connection structure has an assembled state and a disassembled state; when the back support connection structure is in the disassembled state, the lateral part is separated from the corresponding support arm; when the back support connection structure is in the assembled state, the end of the lateral part facing the support arm is connected to the extension end position of the corresponding support arm by screws.

[0012] Preferably, the end of the support arm facing the lateral part has a first mating surface, and the end of the lateral part facing the support arm has a second mating surface. The first mating surface is provided with a screw hole, and the second mating surface is provided with a through hole. The screw passes through the through hole and is screwed into the screw hole to connect the support arm and the lateral part.

[0013] Preferably, the first mating surface is provided with at least one positioning pin perpendicular to the first mating surface, and the second mating surface is provided with a pin hole corresponding to the position of the positioning pin. When the transverse part is connected to the support arm by screws, the positioning pin is inserted into the pin hole. The positioning pin and pin hole design can play a positioning role when the transverse part is connected to the support arm, so that the through hole and the screw hole can be quickly aligned, improving assembly efficiency.

[0014] Preferably, both the first and second mating surfaces are horizontal; the horizontal design allows the two mating surfaces to be quickly connected, facilitating worker assembly and improving assembly efficiency.

[0015] Preferably, the end of the horizontal part facing the support arm is provided with a positioning notch, and the end of the support arm facing the horizontal part is provided with a corresponding positioning block. When the horizontal part and the support arm are connected by screws, the positioning block is inserted into the positioning notch. The design of the positioning block and the positioning notch can serve as a positioning mark in appearance, so that the through hole and the screw hole can be quickly aligned, further improving assembly efficiency.

[0016] Preferably, the end of the lateral portion facing the support arm has a countersunk hole concentric with the through hole and used to accommodate the screw head, so as to hide the screw connection marks on the back bracket.

[0017] Preferably, when the back support connection structure is in the assembled state, one end of the support arm stands downwards at one end of the horizontal part. This allows the screws to be installed from bottom to top without being exposed.

[0018] A seat, comprising the aforementioned back support, and:

[0019] The seat frame has sliding clearance grooves that run through the left and right sides and extend in the front and back directions on both sides.

[0020] One end of the horizontal part is pre-inserted into the sliding clearance groove and then slidably connected to the seat frame in the front-to-back direction, so that the horizontal part and the seat frame are integrated into a seat frame assembly; the other end of the horizontal part protrudes outside the seat frame.

[0021] The seat has a disassembled state and an assembled state; when the seat is disassembled, the backrest connecting part on the backrest support connecting structure is separated from the seat frame assembly; when the seat is assembled, the two support arms on the backrest connecting part are connected to the end of the corresponding transverse part exposed in the seat frame by screws, so that the backrest support connecting structure and the seat frame are slidably connected in the front-back direction.

[0022] Preferably, inside the seat frame, the two horizontal parts extend towards each other and are connected as a whole at one end inserted into the seat frame; this allows the two horizontal parts on the left and right sides of the seat frame to slide synchronously; and the two horizontal parts connected as a whole can be assembled into place in one go inside the seat frame, improving the assembly efficiency of the seat frame and the horizontal parts.

[0023] Preferably, the bottom of the seat frame is provided with symmetrical sliding grooves along the left and right directions, and the sliding grooves extend along the front and back directions. At least two inserts are provided at one end of the transverse part that are inserted into the seat frame and spaced apart along the front and back directions. The inserts pass downward through the sliding grooves, and the end of the inserts that passes through the sliding grooves is connected to a limit screw, so that the transverse part and the seat frame are slidably connected in the front and back directions. Beneficial effects

[0024] This invention provides a back support connection structure and a seat, which offer advantages over existing technologies:

[0025] The split design of the back support connection structure provides a basic structure for the separate packaging of the seat frame and the back support. This allows the horizontal part of the back support to be integrated with the seat frame assembly, which is pre-connected to the seat frame. The seat frame assembly can be packaged and transported together with the backrest connection part of the back support connection structure, saving on the volume and cost of seat transportation. After receiving the seat, the user does not need to remove the seat cushion from the seat frame. The seat can be assembled simply by screwing the backrest connection part onto the horizontal part exposed on the seat frame. The operation is simple and convenient, improving the user experience of the seat. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the back support connection structure;

[0027] Figure 2 is an enlarged view of the countersunk hole on the horizontal part after the back support connection structure is assembled;

[0028] Figure 3 is an enlarged view of the support arm structure;

[0029] Figure 4 is a schematic diagram of the structure pre-installed into the seat frame in the horizontal part;

[0030] Figure 5 is a cross-sectional view of the lateral part at the sliding connection position within the seat frame;

[0031] Figure 6 is a cross-sectional view of the control assembly between the transverse section and the seat frame;

[0032] Figure 7 is an exploded view of the control components;

[0033] Figure 8 is a schematic diagram of the back support connection structure fully assembled on the seat frame assembly;

[0034] The reference numerals in the attached drawings are as follows: 1-backrest connection, 2-support arm, 3-lateral part, 4-seat frame, 5-limiting screw, 6-seat cushion, 7-positioning control component, 21-positioning pin, 22-screw hole, 23-positioning block, 24-first mating surface, 31-pin hole, 32-through hole, 33-positioning notch, 34-second mating surface, 35-countersunk hole, 36-slide rod, 37-vertical plate, 41-sliding clearance groove, 42-gear tooth, 43-slide groove, 71-handle, 72-pull rod, 73-spring, 74-accommodating groove, 75-slot, 76-upright plate. Embodiments of the present invention

[0035] The specific implementation of this invention is as follows:

[0036] As shown in Figures 1-8, the present invention provides a back support connection structure, comprising:

[0037] The backrest connection 1 has symmetrical support arms 2 that extend forward and downward, giving the entire backrest connection 1 a U-shaped structure in appearance.

[0038] The transverse part 3 is configured as a transition carrier for sliding connection between the support arm 2 and the seat frame 4;

[0039] The back support connection structure has an assembled state and a disassembled state; when the back support connection structure is in the disassembled state, the transverse part 3 is separated from the corresponding support arm 2; when the back support connection structure is in the assembled state, the end of the transverse part 3 facing the support arm 2 is connected to the extension end position of the corresponding support arm 2 by screws.

[0040] Furthermore, in the assembled state, the support arm 2 and the transverse part 3 are connected as follows: the end of the support arm 2 facing the transverse part 3 has a first mating surface 24, and the end of the transverse part 3 facing the support arm 2 has a second mating surface 34. The first mating surface 24 has a screw hole 22, and the second mating surface 34 has a through hole 32. A screw passes through the through hole 32 and is screwed into the screw hole 22, thus connecting the support arm 2 and the transverse part 3. In this embodiment, the support arm 2 is a plate-like body, and the transverse part 3 is also a plate-like body. When the back support connection structure is in the assembled state, one end of the support arm 2 stands downwards on one end of the transverse part 3. This allows the screws to be installed from bottom to top without being exposed.

[0041] Furthermore, in order to enable the screws to be quickly aligned with the corresponding mounting holes, at least one positioning pin 21 perpendicular to the first mating surface 24 is provided on the first mating surface 24, and a pin hole 31 corresponding to the position of the positioning pin 21 is provided on the second mating surface 34. When the transverse part 3 and the support arm 2 are connected by screws, the positioning pin 21 is inserted into the pin hole 31. The design of the positioning pin 21 and the pin hole 31 can play a positioning role when the transverse part 3 is connected to the support arm 2, so that the through hole 32 and the screw hole 22 can be quickly aligned, thereby improving assembly efficiency.

[0042] Furthermore, to facilitate assembly by workers, both the first mating surface 24 and the second mating surface 34 are horizontal surfaces. Compared to a design that sets the two mating surfaces to be inclined, the horizontal design allows the two mating surfaces to be quickly mated, making it easier for workers to operate and assemble, thereby improving assembly efficiency.

[0043] Furthermore, to further improve assembly efficiency, the end of the transverse part 3 facing the support arm 2 is provided with a positioning notch 33, and the end of the support arm 2 facing the transverse part 3 is provided with a corresponding positioning block 23. When the transverse part 3 and the support arm 2 are connected by screws, the positioning block 23 is inserted into the positioning notch 33. Under the premise that the positioning pin 21 and the pin hole 31 form a single positioning fit, the design of the positioning block 23 and the positioning notch 33 can serve as a positioning mark in appearance, so that the through hole 32 is aligned with the screw hole 22 and forms a second positioning fit.

[0044] Furthermore, the end of the transverse portion 3 facing the support arm 2 is provided with a countersunk hole 34 concentric with the through hole 32 and used to accommodate the screw head; so as to hide the connection marks of the screw on the back bracket.

[0045] Furthermore, a seat is provided, comprising:

[0046] The aforementioned back support connection structure, and:

[0047] The seat frame 4 has sliding clearance grooves 41 that run through the left and right sides and extend in the front and back direction on both sides. A seat cushion 5 is usually installed on the seat frame 4.

[0048] One end of the transverse part 3 is pre-inserted into the sliding clearance groove 41 and then slidably connected to the seat frame 4 in the front-to-back direction, forming a seat frame assembly that integrates the transverse part 3 and the seat frame 4; the other end of the transverse part 3 protrudes outside the seat frame 4.

[0049] The seat has a disassembled state and an assembled state. When the seat is disassembled, the backrest connecting part 1 in the backrest support connecting structure is separated from the seat frame assembly. At this time, the seat frame assembly, which is integrated as one piece, can be packaged separately, and the backrest connecting part 1 in the backrest support connecting structure can also be packaged separately. When the seat is assembled, the two support arms 2 on the backrest connecting part 1 and the end of the corresponding transverse part 3 that protrudes from the seat frame 4 are connected by screws, so that the backrest support connecting structure and the seat frame 4 are slidably connected in the front-back direction. The sliding connection between the backrest support connecting structure and the seat frame 4 can be completed without removing the seat cushion 5 on the seat frame 4.

[0050] Furthermore, the end of the transverse part 3 inside the seat frame 4 is slidably connected to the seat frame 4 as follows: the bottom of the seat frame 4 is provided with symmetrical sliding grooves 43 in the left-right direction, the sliding grooves 43 extend in the front-back direction, and the end of the transverse part 3 inserted into the seat frame 4 is provided with at least two inserts 36 spaced apart in the front-back direction. The inserts 36 pass downward through the sliding grooves 43, and the end of the inserts 36 passing through the sliding grooves 43 is connected to a limit screw 5, so that the transverse part 3 and the seat frame 4 are slidably connected in the front-back direction.

[0051] Furthermore, inside the seat frame 4, the two transverse parts 3 extend towards each other and connect as a whole, allowing the two transverse parts 3 on the left and right sides of the seat frame 4 to slide synchronously. The two connected transverse parts 3 can be assembled into place in one go within the seat frame 4, improving the assembly efficiency of the seat frame 4 and the transverse parts 3. Specifically, if the two transverse parts 3 are not connected, during assembly, one transverse part 3 needs to be removed first, then the insert 36 on the transverse part 3 needs to be placed in the slide groove 43, and then the limiting screw 5 needs to be installed. After installation, the next transverse part 3 needs to be removed and installed, and the above steps repeated. However, when the two transverse parts 3 are connected, they only need to be removed once, the insert 36 on both transverse parts 3 needs to be placed in the corresponding slide groove 43, and then the limiting screw 5 needs to be installed in place at once. It is easy to see that the design of the two transverse parts 3 being connected into one piece achieves two goals at once and is ingeniously designed.

[0052] Furthermore, after the backrest is slidably connected to the seat frame 4, the seat depth can be adjusted by sliding back and forth. After the seat depth is adjusted to the correct position, the backrest connection structure and the chair back connected to the backrest connection structure need to be positioned back and forth for easy sitting. Therefore, a positioning control component 7 is also provided between the transverse part 3 and the seat frame 4. This component can lock or unlock the transverse part 3 that is slidably connected to the seat frame 4. The positioning control component 7 includes a resiliently resettable pull rod 72. A handle 71 is connected to the outside of the pull rod 72. A slot 75 is provided at the inner end of the pull rod 72. The seat frame 4 has multiple evenly distributed front and rear stop teeth 42 at the end facing the slot 75. One of the stop teeth 42 is locked in the slot 75. Pulling the handle 71 will separate the stop tooth 42 from the slot 75, at which point the lock is released and the backrest can slide back and forth. Releasing the handle 71 will reset the pull rod 72. At this time, the corresponding stop tooth 42 will engage with the slot 75, allowing the backrest to switch to the positioning state.

[0053] Furthermore, the elastic reset of the pull rod 72 is achieved as follows: the pull rod 72 has a receiving groove 74 on its body, one end of the receiving groove 74 has a vertical plate 76, and the bottom of the horizontal part 3 has a vertical plate 37. The vertical plate 37 is inserted into the other end of the receiving groove 74. A spring 73 is provided in the receiving groove 74. One end of the spring 73 abuts against the vertical plate 76, and the other end abuts against the vertical plate 37, thereby providing elastic reset force for the pull rod 72. For other specific structures, please refer to the seat depth adjustment control mechanism patent with Chinese patent application number CN2024211156135, which will not be repeated here.

Claims

1. A back support connection structure, characterized in that, include: The backrest connection part (1) has a support arm (2) that is symmetrical on the left and right and extends forward and downward. The transverse part (3) is configured as a transition carrier for sliding connection between the support arm (2) and the seat frame (4); The back support connection structure has an assembled state and a disassembled state; when the back support connection structure is in the disassembled state, the transverse part (3) is separated from the corresponding support arm (2); when the back support connection structure is in the assembled state, the end of the transverse part (3) facing the support arm (2) is connected to the extension end position of the corresponding support arm (2) by screws.

2. The back support connection structure according to claim 1, characterized in that: The support arm (2) has a first mating surface (24) at one end facing the transverse part (3), and the transverse part (3) has a second mating surface (34) at one end facing the support arm (2). The first mating surface (24) has a screw hole (22), and the second mating surface (34) has a through hole (32). The screw passes through the through hole (32) and is screwed into the screw hole (22) to connect the support arm (2) with the transverse part (3).

3. The back support connection structure according to claim 2, characterized in that: The first mating surface (24) is provided with at least one positioning pin (21) perpendicular to the first mating surface (24), and the second mating surface (34) is provided with a pin hole (31) corresponding to the position of the positioning pin (21). When the transverse part (3) and the support arm (2) are connected by screws, the positioning pin (21) is inserted into the pin hole (31).

4. The back support connection structure according to claim 2, characterized in that: Both the first docking surface (24) and the second docking surface (34) are horizontal.

5. The back support connection structure according to claim 1, characterized in that: The horizontal part (3) has a positioning notch (33) at one end facing the support arm (2), and the support arm (2) has a corresponding positioning block (23) at one end facing the horizontal part (3). When the horizontal part (3) and the support arm (2) are connected by screws, the positioning block (23) is inserted into the positioning notch (33).

6. The back support connection structure according to claim 1, characterized in that: The transverse part (3) has a countersunk hole (34) concentric with the through hole (32) at one end facing the support arm (2) for accommodating the screw head.

7. The back support connection structure according to claim 2, characterized in that: When the back support connection structure is in the assembled state, one end of the support arm (2) stands downward on one end of the horizontal part (3).

8. A type of seat, characterized in that, Including the back support connection structure as described in claim 1, and: The seat frame (4) has sliding clearance grooves (41) that are through to the left and right and extend in the front and back directions on both sides of the seat frame (4). One end of the transverse part (3) is pre-inserted into the sliding clearance groove (41) and then slidably connected to the seat frame (4) in the front-back direction, so that the transverse part (3) and the seat frame (4) are integrated into a seat frame assembly; the other end of the transverse part (3) protrudes outside the seat frame (4); The seat has a disassembled state and an assembled state; when the seat is disassembled, the backrest connecting part (1) in the backrest connecting structure is separated from the seat frame assembly; when the seat is assembled, the two support arms (2) on the backrest connecting part (1) and the corresponding transverse part (3) are connected to the end of the seat frame (4) by screws, so that the backrest and the seat frame (4) are slidably connected in the front-back direction.

9. A seat according to claim 8, characterized in that: Inside the frame (4), the two transverse parts (3) are inserted into one end of the frame (4) and extend towards each other to form a whole.

10. A seat according to claim 8, characterized in that: The bottom of the seat frame (4) is symmetrically provided with a sliding groove (43) in the left-right direction. The sliding groove (43) extends in the front-back direction. At least two inserts (36) are provided at one end of the transverse part (3) inserted into the seat frame (4) in the front-back direction. The inserts (36) pass through the sliding groove (43) downwards, and the end of the inserts (36) passing through the sliding groove (43) is connected to a limit screw (5), so that the transverse part (3) and the seat frame (4) are slidably connected in the front-back direction.

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