Seat

Abstract

The utility model discloses a seat. The seat comprises a chassis support and a seat body, the back connecting bracket is arranged at the rear end of the chassis bracket and is rotatably connected with the chassis bracket through a first rotating shaft which extends along the left and right directions; the backrest framework is fixed on the back connecting bracket; the driving mechanism is rotatably connected with the chassis support through a second rotating shaft extending in the left-right direction, the driving mechanism comprises a push rod capable of stretching out and drawing back in the front-back direction, the rear end of the push rod is rotatably connected with the back connecting support through a third rotating shaft extending in the left-right direction, and the driving mechanism drives the back connecting support to rotate through the push rod; the angle of the backrest framework is adjusted. According to the seat disclosed by the utility model, the rotation angle of the backrest framework can be effectively adjusted, and the operation is convenient and fast, so that the use requirements of users are effectively met, and the comfort of the seat is effectively improved. In addition, the structure of the seat is simple, so that the convenience of installation and maintenance can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a seating system. Background Technology

[0002] A chair typically consists of three parts: a base, a seat, and a backrest. The backrest supports the occupant's back. Traditional chair backrests are generally either fixed or adjustable. Adjustable backrests allow for different reclining angles to provide varying support and accommodate different seating needs.

[0003] In existing adjustable backrest seats, mechanical gear assemblies are typically used for angle adjustment. However, these gear adjustment assemblies are often complex in structure and usually require users to manually adjust the backrest angle, which affects the comfort of the seat and consequently the user experience. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a seat that can effectively adjust the rotation angle of the backrest frame and is easy to operate, thereby effectively improving the comfort of the seat. Furthermore, the seat has a simple structure, thus effectively improving the convenience of installation and maintenance.

[0005] The seat according to this utility model includes: a chassis support; a backrest connecting support, the backrest connecting support being disposed at the rear end of the chassis support and rotatably connected to the chassis support via a first rotating shaft extending left and right; a backrest frame, the backrest frame being fixed to the backrest connecting support; and a drive mechanism, the drive mechanism being rotatably connected to the chassis support via a second rotating shaft extending left and right, the drive mechanism including a push rod retractable in a front-rear direction, the rear end of the push rod being rotatably connected to the backrest connecting support via a third rotating shaft extending left and right, the drive mechanism driving the backrest connecting support to rotate via the push rod to adjust the angle of the backrest frame.

[0006] The seat according to this utility model comprises a chassis support, a backrest connecting support, a backrest frame, and a drive mechanism. The backrest connecting support is located at the rear end of the chassis support and is rotatably connected to the chassis support via a first pivot extending left and right. The backrest frame is fixed to the backrest connecting support. The drive mechanism is rotatably connected to the chassis support via a second pivot extending left and right. The drive mechanism includes a push rod that is retractable in the front-rear direction. The rear end of the push rod is rotatably connected to the backrest connecting support via a third pivot extending left and right. The drive mechanism drives the backrest connecting support to rotate via the push rod, thereby adjusting the angle of the backrest frame. This effectively adjusts the rotation angle of the backrest frame and is easy to operate, thus effectively meeting the user's needs and improving the comfort of the seat. Furthermore, the seat has a simple structure, which effectively improves the convenience of installation and maintenance.

[0007] In some embodiments, the first rotating shaft and the third rotating shaft are arranged at intervals in the vertical direction.

[0008] In some embodiments, the push rod includes a fixed section and a movable section that extend in both directions. The movable section is connected to the rear side of the fixed section and is movable relative to the fixed section in the forward and backward direction. The third pivot is located at the rear end of the movable section, and the second pivot is located at the front end of the fixed section.

[0009] In some embodiments, the chassis support includes: a first connecting frame, the first connecting frame being U-shaped with an opening, the front end of the fixed section extending into the inner side of the first connecting frame, a second shaft hole being formed on the portion of the fixed section extending into the first connecting frame, and a second rotating shaft passing through the second shaft hole and having both ends rotatably connected to the first connecting frame.

[0010] In some embodiments, the chassis support further includes: two first side plates, which are spaced apart in the left-right direction; a plurality of first crossbeams, which extend left and right and connect between the two first side plates; the plurality of first crossbeams are arranged vertically at intervals; and a support beam, which connects the first crossbeams and the first side plates, wherein the first connection is mounted on the support beam, and the rear end of the movable section passes between two adjacent first crossbeams and extends to connect with the back connection bracket.

[0011] In some embodiments, the support beam includes: a first support segment extending front to back, the rear end of the first support segment being fixedly connected to one of the first crossbeams; a second support segment connected to the front end of the first support segment and extending in a left-right direction, the second support segment being connected to at least one of the first side plates, wherein the first connecting frame is arranged on the lower side of the support beam and is U-shaped with an opening facing downwards, the upper end of the first connecting frame being connected to both the first support segment and the second support segment.

[0012] In some embodiments, the drive mechanism further includes a drive motor and a transmission assembly. The drive motor is disposed on the lower side of the fixed section and is connected to the push rod via the transmission assembly to drive the movable section to move.

[0013] In some embodiments, the back connection bracket includes two second side plates and a plurality of second crossbeams. The two second side plates are arranged at intervals in the left-right direction, and the plurality of second crossbeams extend left and right and are connected between the two second side plates. The plurality of second crossbeams are arranged at intervals in the up-down direction, and the rear end of the push rod is rotatably connected to one of the second crossbeams.

[0014] In some embodiments, the back connection bracket further includes: a second connection frame, the second connection frame being fixed to the second crossbeam and having a U-shape with an opening facing forward, the rear end of the push rod extending into the second connection frame and forming a third shaft hole that passes through the push rod radially, and the third rotating shaft passing through the third shaft hole and having its two ends respectively fixed to the second connection frame.

[0015] In some embodiments, the backrest frame is a single piece and includes: a seat plate portion and a back plate portion. The seat plate portion extends front to back, the front end of the seat plate portion is connected to the back connecting bracket, the back plate portion is connected to the rear end of the seat plate portion and extends upward, and a forward-extending flange is formed on the periphery of the back plate portion. The flange extends circumferentially along the back plate portion, and both ends of the flange in the circumferential direction of the back plate portion extend to connect with the seat plate portion.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a seat at one angle according to an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the seat according to another angle of an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the seat from another angle according to an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of a chassis support according to an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of the back connection bracket according to an embodiment of the present utility model;

[0022] Figure 6 This is a schematic diagram of the backrest frame according to an embodiment of the present utility model;

[0023] Figure 7 This is a schematic diagram of the drive mechanism according to an embodiment of the present utility model.

[0024] Figure label:

[0025] 100. Seats;

[0026] 10. Chassis bracket; 101. First shaft hole; 11. First connecting frame; 12. First side plate; 13. First crossbeam; 14. Support beam; 141. First support section; 142. Second support section;

[0027] 20. Back connecting bracket; 201. First connecting hole; 21. Second side plate; 22. Second crossbeam; 23. Second connecting frame;

[0028] 30. Backrest frame; 31. Seat plate; 310. Second connecting hole; 32. Back panel; 321. Flanged edge;

[0029] 40. Drive mechanism; 41. Push rod; 411. Fixed section; 412. Moving section; 42. Drive motor; 43. Control lever;

[0030] 50. Second pivot;

[0031] 60. Third pivot. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0033] The following is for reference. Figures 1-7 Describes a seat 100 according to an embodiment of the present utility model.

[0034] like Figures 1-7As shown, the seat 100 according to an embodiment of the present utility model includes: a chassis support 10, a backrest connecting support 20, a backrest frame 30, and a drive mechanism 40.

[0035] The back support bracket 20 is located at the rear end of the chassis bracket 10 and is rotatably connected to the chassis bracket 10 via a first rotating shaft extending left and right. The backrest frame 30 is fixed to the back support bracket 20. The drive mechanism 40 is rotatably connected to the chassis bracket 10 via a second rotating shaft 50 extending left and right. The drive mechanism 40 includes a push rod 41 that is telescopic in the front-back direction. The rear end of the push rod 41 is rotatably connected to the back support bracket 20 via a third rotating shaft 60 extending left and right. The drive mechanism 40 drives the back support bracket 20 to rotate via the push rod 41 to adjust the angle of the backrest frame 30.

[0036] In a specific example, such as Figures 1-5 As shown, the rear end of the chassis bracket 10 and the front end of the back connecting bracket 20 are both provided with a first shaft hole 101. The first rotating shaft extends in the left and right direction and is rotatably inserted in the first shaft hole 101. The front end of the back connecting bracket 20 is rotatably connected to the rear end of the chassis bracket 10 through the first rotating shaft. That is to say, the back connecting bracket 20 can rotate relative to the chassis bracket 10 about the first rotating shaft extending in the left and right direction.

[0037] Furthermore, such as Figure 5 and Figure 6 As shown, the back support bracket 20 has a first connection hole 201 at its rear end and a second connection hole 310 at its front end. The front end of the back support frame 30 is bolted to the rear end of the back support bracket 20 through the first connection hole 201 and the second connection hole 310. Thus, the back support frame 30 and the back support bracket 20 can be fixed together. In other words, the back support frame 30 and the back support bracket 20 can rotate relative to the chassis bracket 10 around a first pivot extending in the left-right direction.

[0038] In a specific example, such as Figures 1-3 As shown, the drive mechanism 40 is located on the lower side of the chassis support 10, and the front end of the push rod 41 of the drive mechanism is rotatably connected to the front end of the chassis support 10 via a second rotating shaft 50 extending in the left-right direction. In other words, the drive mechanism 40 can rotate relative to the chassis support 10 about the second rotating shaft 50 extending in the left-right direction.

[0039] Furthermore, the push rod 41 of the drive mechanism 40 is a pneumatic rod or an electric rod, and the rear end of the push rod 41 of the drive mechanism 40 is rotatably connected to the back connecting bracket 20 via a third rotating shaft 60 extending in the left-right direction. That is to say, the drive mechanism 40 can rotate relative to the back connecting bracket 20 about the third rotating shaft 60 extending in the left-right direction.

[0040] In a specific example, such as Figure 7 As shown, the drive mechanism 40 is also equipped with a lever 43. When the user needs to adjust the rotation angle of the backrest frame 30, the drive mechanism 40 can be adjusted by the lever 43, so that the push rod 41 can be extended or shortened, thereby driving the back connecting bracket 20 and the backrest frame 30 to rotate around the first rotating axis extending in the left and right direction, so that the backrest frame 30 can be rotated backward or forward to a suitable position.

[0041] In this embodiment, when the push rod 41 of the drive mechanism 40 extends or shortens, the entire drive mechanism 40 can rotate relative to the chassis bracket 10 around the second rotating shaft 50 extending in the left and right direction. Under the driving action of the push rod 41 of the drive mechanism 40, the back connecting bracket 20 and the backrest frame 30 can rotate around the first rotating shaft extending in the left and right direction. At this time, the push rod 41 of the drive structure will also rotate relative to the third rotating shaft 60 extending in the left and right direction of the back connecting bracket 20, thereby effectively adjusting the rotation angle of the backrest frame 30.

[0042] Therefore, the seat 100 of this application can effectively convert the fixed-axis rotational motion of the drive mechanism 40 and the linear extension and retraction motion of the push rod 41 of the drive mechanism 40 into the fixed-axis rotational motion of the backrest frame 30, thereby effectively adjusting the rotational position of the backrest frame 30 and simplifying the adjustment process of the backrest frame 30, thus facilitating user operation and effectively meeting user needs. Furthermore, the backrest connecting bracket 20 is rotatably connected to the chassis bracket 10 via a first rotating shaft, and the drive mechanism 40 is rotatably connected to the chassis bracket 10 and the backrest connecting bracket 20 via a second rotating shaft 50 and a third rotating shaft 60, respectively. This effectively simplifies the structure of the seat 100 and facilitates installation and maintenance.

[0043] According to an embodiment of the present invention, the seat 100 includes a chassis support 10, a backrest connecting support 20, a backrest frame 30, and a drive mechanism 40. The backrest connecting support 20 is located at the rear end of the chassis support 10 and is rotatably connected to the chassis support 10 via a first rotating shaft extending left and right. The backrest frame 30 is fixed to the backrest connecting support 20. The drive mechanism 40 is rotatably connected to the chassis support 10 via a second rotating shaft 50 extending left and right. The drive mechanism 40 includes a push rod 41 that is retractable in the front-rear direction. The rear end of the push rod 41 is rotatably connected to the backrest connecting support 20 via a third rotating shaft 60 extending left and right. The drive mechanism 40 drives the backrest connecting support 20 to rotate via the push rod 41, thereby adjusting the angle of the backrest frame 30. This effectively adjusts the rotation angle of the backrest frame 30 and is easy to operate, thus effectively meeting the user's needs and improving the comfort of the seat 100. Furthermore, the seat 100 has a simple structure, which effectively improves the convenience of installation and maintenance.

[0044] Preferably, both the chassis support 10 and the back connection support 20 can be made of Q235 steel. It should be noted that Q235 steel has good strength and toughness, capable of withstanding certain tensile, compressive, and bending loads. Furthermore, components made of Q235 steel are easy to weld, cut, and bend. Therefore, using Q235 steel for the chassis support 1010 and the back connection support 2020 can effectively improve structural strength and reduce processing difficulty.

[0045] Preferably, the backrest frame 30 can be made of aluminum alloy or plastic. It should be noted that aluminum alloy is an alloy material based on aluminum with one or more alloying elements added. By adding different alloying elements, the mechanical properties of aluminum can be significantly improved, such as increasing strength, hardness, and wear resistance, while maintaining its advantages of being lightweight and corrosion-resistant. Generally speaking, aluminum alloy has advantages such as high specific strength, light weight, low cost, easy processing, corrosion resistance, and recyclability. It should also be noted that plastic materials are relatively lightweight, thus reducing the overall weight of the seat 100. Furthermore, the manufacturing cost of plastic products is generally low, and they are easy to process and manufacture, thereby effectively reducing the cost of the seat 100.

[0046] In one embodiment of this utility model, such as Figures 1-3 As shown, the first and third rotating shafts 60 are arranged at intervals in the vertical direction. For example, the first rotating shaft is arranged above the third rotating shaft 60; or, for example, the first rotating shaft is arranged below the third rotating shaft 60. In a specific example, as... Figures 1-3 As shown, the first rotating shaft is arranged above the third rotating shaft 60.

[0047] When the user needs to adjust the backrest frame 30 to rotate forward, the drive mechanism 40 can be adjusted to extend the push rod 41, that is, the rear end of the push rod 41 moves backward, thereby driving the back connecting bracket 20 to rotate, and thus driving the backrest frame 30 to rotate forward; when the user needs to adjust the backrest frame 30 to rotate backward, the drive mechanism 40 can be adjusted to shorten the push rod 41, that is, the rear end of the push rod 41 moves forward, thereby driving the back connecting bracket 20 to rotate, and thus driving the backrest frame 30 to rotate backward.

[0048] In this embodiment, by arranging the first rotating shaft and the third rotating shaft 60 at intervals in the vertical direction, the lever arm of the push rod 41 driving the back connecting bracket 20 to rotate can be effectively increased, thereby enabling the force generated by the push rod 41 when it extends or retracts to be more effectively transmitted to the back connecting bracket 20, and thus effectively improving the working efficiency of the drive mechanism 40.

[0049] In one embodiment of this utility model, such as Figure 7As shown, the push rod 41 includes a fixed section 411 and a movable section 412 that extend in both directions. The movable section 412 is connected to the rear side of the fixed section 411 and is movable relative to the fixed section 411 in the forward and backward direction. The third rotating shaft 60 is located at the rear end of the movable section 412, and the second rotating shaft 50 is located at the front end of the fixed section 411.

[0050] In a specific example, such as Figure 7 As shown, the movable segment 412 is connected to the rear side of the fixed segment 411, and the movable segment 412 can extend and retract relative to the fixed segment 411 in the front-back direction. When the drive mechanism 40 drives the push rod 41 to extend, the fixed segment 411 remains stationary, and the movable segment 412 can move in the front-back direction toward the side away from the fixed segment 411; when the drive mechanism 40 drives the push rod 41 to retract, the fixed segment 411 remains stationary, and the movable segment 412 can move in the front-back direction toward the side closer to the fixed segment 411. In other words, the movable segment 412 can realize the extension and retraction function of the push rod 41 by moving relative to the fixed segment 411 in the front-back direction.

[0051] In this embodiment, a fixed section 411 and a movable section 412 extending in both directions are provided in the push rod 41. The movable section 412 is connected to the rear side of the fixed section 411 and can move in the front-back direction relative to the fixed section 411. The third rotating shaft 60 is located at the rear end of the movable section 412 and the second rotating shaft 50 is located at the front end of the fixed section 411. This not only effectively realizes the extension and retraction function of the push rod 41, but also effectively ensures the stability and reliability of the push rod 41 during extension and retraction.

[0052] In one embodiment of this utility model, such as Figure 3 As shown, the chassis support 10 includes: a first connecting frame 11, the first connecting frame 11 is a U-shaped structure with an opening, the front end of the fixing section 411 extends into the inner side of the first connecting frame 11, a second shaft hole is formed on the part of the fixing section 411 that extends into the first connecting frame 11, and a second rotating shaft 50 passes through the second shaft hole and is rotatably connected to the first connecting frame 11 at both ends.

[0053] In a specific example, the first connecting frame 11 is fixedly connected to the chassis support 10. Further, a second shaft hole is formed on the part of the front end of the fixed section 411 that extends into the first connecting frame 11, which is radially through the fixed section 411. Shaft holes are formed on the left and right side plates of the first connecting frame 11, which are through the side plates along the thickness direction of the side plates. The second rotating shaft 50 passes through the second shaft hole and the shaft holes on the left and right side plates of the first connecting frame 11.

[0054] In this embodiment, a first connecting frame 11 is provided in the chassis support 10. The first connecting frame 11 is U-shaped with an opening. The front end of the fixed section 411 extends into the inner side of the first connecting frame 11. A second shaft hole is formed on the part of the fixed section 411 that extends into the first connecting frame 11. The second rotating shaft 50 passes through the second shaft hole and its two ends are rotatably connected to the first connecting frame 11. This can effectively simplify the structural construction of the connection between the push rod 41 and the chassis support 10, and effectively improve the stability and reliability of the push rod 41 when it rotates around the second rotating shaft 50 relative to the chassis support 10.

[0055] In one embodiment of this utility model, such as Figures 1-4 As shown, the chassis support 10 also includes: two first side plates 12, multiple first crossbeams 13 and support beams 14.

[0056] Two first side plates 12 are arranged at intervals in the left and right direction. Multiple first crossbeams 13 extend left and right and connect between the two first side plates 12. Multiple first crossbeams 13 are arranged vertically at intervals. A support beam 14 connects the first crossbeams 13 and the first side plates 12. The first connecting frame 11 is provided on the support beam 14. The rear end of the movable section 412 passes between two adjacent first crossbeams 13 and extends to connect with the back connecting bracket 20.

[0057] For example, the number of first crossbeams 13 can be two, three, four, five, or more than six. In a specific example, such as Figure 4 As shown, there are two first crossbeams 13, which are arranged vertically at intervals. The left ends of both first crossbeams 13 are welded to the right side surface of the left first side plate 12, and the right ends of both first crossbeams 13 are welded to the left side surface of the right first side plate 12.

[0058] Furthermore, one end of the support beam 14 is welded to the front surface of the upper first crossbeam 13, and the other end of the support beam 14 is welded to the right surface of the left first side plate 12. The first connecting frame 11 is disposed on the lower surface of the support beam 14. The rear end of the movable section 412 passes through the two first crossbeams 13 and is rotatably connected to the back connecting bracket 20. The front end of the fixed section 411 is rotatably connected to the first connecting frame 11 through the second rotating shaft 50.

[0059] This embodiment provides two first side plates 12, multiple first crossbeams 13, and a support beam 14 in the chassis support 10. The two first side plates 12 are spaced apart in the left-right direction, and the multiple first crossbeams 13 extend left and right and connect between the two first side plates 12. The multiple first crossbeams 13 are arranged vertically at intervals, and the support beam 14 connects the first crossbeams 13 and the first side plates 12. The first connecting frame 11 is provided on the support beam 14, and the rear end of the movable section 412 passes between two adjacent first crossbeams 13 and extends to connect with the back connecting bracket 20. This effectively strengthens the structural strength and rigidity of the chassis support 10, thereby effectively improving the durability of the chassis support 10 and extending its service life.

[0060] In one embodiment of this utility model, such as Figures 1-4 As shown, the support beam 14 includes: a first support section 141 and a second support section 142.

[0061] The first support section 141 extends front and rear, and the rear end of the first support section 141 is fixedly connected to one of the first crossbeams 13; the second support section 142 is connected to the front end of the first support section 141 and extends in the left and right direction, and the second support section 142 is connected to at least one first side plate 12. The first connecting frame 11 is arranged on the lower side of the support beam 14 and is U-shaped with the opening facing downward. The upper end of the first connecting frame 11 is connected to both the first support section 141 and the second support section 142.

[0062] For example, the second support segment 142 is connected to one of the two first side plates 12; or the second support segment 142 is connected to both first side plates 12. In a specific example, such as Figure 4 As shown, the rear end of the first support section 141 is welded to the front surface of the upper first crossbeam 13, the right end of the second support section 142 is welded to the left side surface of the front end of the first support section 141, and the left end of the second support section 142 is welded to the right side surface of the left first side plate 12. Thus, the support beam 14 can be fixed on the chassis bracket 10.

[0063] Furthermore, the first connector is provided with a top plate. Part of the top plate of the first connector is welded to the first support section 141, and another part is welded to the second support section 142. Thus, the first connector can be fixed to the support beam 14, thereby enabling the first connector to provide a stable support point for the drive mechanism 40.

[0064] This embodiment provides a first support segment 141 and a second support segment 142 in the support beam 14. The first support segment 141 extends front to back, and its rear end is fixedly connected to one of the first crossbeams 13. The second support segment 142 is connected to the front end of the first support segment 141 and extends in the left-right direction. The second support segment 142 is connected to at least one first side plate 12. A first connecting frame 11 is arranged on the lower side of the support beam 14 and is U-shaped with its opening facing downward. The upper end of the first connecting frame 11 is connected to both the first support segment 141 and the second support segment 142. This effectively fixes the support beam 14 and the first connecting member, thereby enabling the first connecting member to provide a stable support point for the drive mechanism 40, thus effectively improving the stability of the drive mechanism 40.

[0065] In one embodiment of this utility model, such as Figure 7 As shown, the drive mechanism 40 also includes a drive motor 42 and a transmission assembly. The drive motor 42 is located below the fixed section 411 and is connected to the push rod 41 via the transmission assembly to drive the movable section 412 to move. When the user needs to adjust the rotation angle of the backrest frame 30, the drive motor 42 is controlled by adjusting the control lever 43. The drive motor 42 controls the extension and retraction of the push rod 41 via the transmission assembly, thereby effectively controlling the rotation of the backrest connecting bracket 20 and thus adjusting the rotation angle of the backrest frame 30.

[0066] In this embodiment, by setting a drive motor 42 and a transmission assembly in the drive mechanism 40, the drive motor 42 is arranged on the lower side of the fixed section 411. The drive motor 42 is connected to the push rod 41 through the transmission assembly to drive the movable section 412 to move. This not only optimizes the spatial arrangement of the drive mechanism 40, but also makes it easier for the user to adjust the push rod 41, thereby effectively improving the convenience of operation.

[0067] In one embodiment of this utility model, such as Figure 5 As shown, the back connecting bracket 20 includes two second side plates 21 and multiple second crossbeams 22. The two second side plates 21 are arranged at intervals in the left-right direction, and the multiple second crossbeams 22 extend left and right and are connected between the two second side plates 21. The multiple second crossbeams 22 are arranged at intervals in the up-down direction, and the rear end of the push rod 41 is rotatably connected to one of the second crossbeams 22.

[0068] For example, the number of second crossbeams 22 can be two, three, four, five, or more than six. In a specific example, such as... Figure 5As shown, there are two second crossbeams 22. The left ends of both second crossbeams 22 are welded to the right surface of the left second side plate 21, and the right ends of both second crossbeams 22 are welded to the left surface of the right second side plate 21. Furthermore, the two second crossbeams 22 are spaced apart in the vertical direction and also spaced apart in the front-back direction. The rear end of the push rod 41 is rotatably connected to the lower second crossbeam 22.

[0069] This embodiment provides two second side plates 21 and multiple second crossbeams 22 in the back connecting bracket 20. The two second side plates 21 are arranged at intervals in the left-right direction, and the multiple second crossbeams 22 extend left and right and connect between the two second side plates 21. The multiple second crossbeams 22 are arranged at intervals in the up-down direction. The rear end of the push rod 41 is rotatably connected to one of the second crossbeams 22. This effectively strengthens the structural strength and rigidity of the back connecting bracket 20, thereby effectively improving the durability of the back connecting bracket 20 and extending its service life.

[0070] In one embodiment of this utility model, such as Figure 5 As shown, the back connecting bracket 20 also includes: a second connecting bracket 23, which is fixed on the second crossbeam 22 and has a U-shape with the opening facing forward. The rear end of the push rod 41 extends into the second connecting bracket 23 and forms a third shaft hole that passes through the push rod 41 radially. The third rotating shaft 60 passes through the third shaft hole and is fixed at both ends to the second connecting bracket 23.

[0071] In a specific example, one end of the second connecting frame 23 is welded to the second crossbeam 22 on the lower side of the back connecting bracket 20. The left and right side plates of the second connecting frame 23 are each formed with shaft holes that penetrate the side plates along the thickness direction. The third rotating shaft 60 passes through the third shaft hole and the shaft holes on the left and right side plates of the second connecting frame 23, and both ends of the third rotating shaft 60 are fixedly connected to the second connecting frame 23.

[0072] In this embodiment, a second connecting frame 23 is provided in the back connecting bracket 20. The second connecting frame 23 is fixed on the second crossbeam 22 and is U-shaped with an opening facing forward. The rear end of the push rod 41 extends into the second connecting frame 23 and forms a third shaft hole that passes through the push rod 41 radially. The third rotating shaft 60 passes through the third shaft hole and is fixed at both ends to the second connecting frame 23. This can effectively simplify the structural construction of the connection between the push rod 41 and the back connecting bracket 20, and effectively improve the stability and reliability of the push rod 41 when it rotates around the third rotating shaft 60 relative to the back connecting bracket 20.

[0073] In one embodiment of this utility model, such as Figure 6As shown, the backrest frame 30 is a single piece and includes a seat plate portion 31 and a back plate portion 32. The seat plate portion 31 extends forward and backward, and the front end of the seat plate portion 31 is connected to the back connecting bracket 20. The back plate portion 32 is connected to the rear end of the seat plate portion 31 and extends upward. A forward-extending flange 321 is formed on the periphery of the back plate portion 32. The flange 321 extends along the circumference of the back plate portion 32, and both ends of the flange 321 in the circumferential direction of the back plate portion 32 extend to connect with the seat plate portion 31.

[0074] In a specific example, such as Figure 5 and Figure 6 As shown, the back support bracket 20 has a first connection hole 201 at its rear end and a second connection hole 310 at its front end. The backrest frame 30 and the back support plate can be fixed together through the first connection hole 201 and the second connection hole 310, so that the backrest frame 30 and the back support bracket 20 can rotate relative to the chassis bracket 10 around a first pivot extending in the left and right direction.

[0075] For example Figure 6 As shown, the flanges 321 on the left and right sides of the back panel 32 extend to connect with the seat panel 31, and the connection between the flanges 321 and the seat panel 31 is rounded. This effectively avoids stress concentration at the connection between the flanges 321 and the seat panel 31, thereby effectively improving the load-bearing capacity of the backrest frame 30.

[0076] In this embodiment, by setting the backrest frame 30 as a single piece and providing a seat plate portion 31 and a back plate portion 32 within the backrest frame 30, the seat plate portion 31 extends forward and backward, with its front end connected to the back connecting bracket 20, and the back plate portion 32 connected to the rear end of the seat plate portion 31 and extending upward, the assembly steps of the backrest frame 30 can be reduced, thus lowering the assembly difficulty of the backrest frame 30. By providing a forward-extending flange 321 around the periphery of the back plate portion 32, with the flange 321 extending circumferentially along the back plate portion 32 and extending to connect with the seat plate portion 31 at both ends of the flange 32 in the circumferential direction, the structural strength of the back plate portion 32 can be effectively improved, thereby effectively increasing the load-bearing capacity of the backrest frame 30.

[0077] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0079] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0081] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A seat, characterized in that, The utility model relates to a backrest adjusting mechanism of a chair, which comprises: a chassis support; a back connecting support arranged at the rear end of the chassis support and rotatably connected with the chassis support through a first rotating shaft extending in the left-right direction; a backrest framework fixed to the back connecting support; a driving mechanism rotatably connected with the chassis support through a second rotating shaft extending in the left-right direction, the driving mechanism comprising a push rod telescopically extending in the front-rear direction, the rear end of the push rod being rotatably connected with the back connecting support through a third rotating shaft extending in the left-right direction, the driving mechanism driving the back connecting support to rotate through the push rod to adjust the angle of the backrest framework.

2. The seat of claim 1, wherein The first rotating shaft and the third rotating shaft are arranged in the up-down direction.

3. The seat of claim 1, wherein The push rod comprises a fixed segment and a movable segment, both extending in the front-rear direction, the movable segment being connected to the rear side of the fixed segment and movable relative to the fixed segment in the front-rear direction, the third rotating shaft being arranged at the rear end of the movable segment, and the second rotating shaft being arranged at the front end of the fixed segment.

4. The seat of claim 3, wherein The chassis support comprises a first connecting support in the shape of a U-shaped structure with an opening, the front end of the fixed segment extending into the inner side of the first connecting support, a second shaft hole being formed on the part of the fixed segment extending into the first connecting support, the second rotating shaft being arranged in the second shaft hole and having two ends rotatably connected with the first connecting support.

5. The seat of claim 4, wherein, The chassis support further comprises: two first side plates arranged in the left-right direction, a plurality of first cross beams extending in the left-right direction and connected between the two first side plates, the plurality of first cross beams being arranged in the up-down direction, a support beam connected between the first cross beams and the first side plates, wherein the first connecting support is arranged on the support beam, the rear end of the movable segment extending through the two adjacent first cross beams and being connected with the back connecting support.

6. The seat of claim 5, wherein, The support beam comprises: a first support segment extending in the front-rear direction, the rear end of the first support segment being fixedly connected with one of the first cross beams; a second support segment connected to the front end of the first support segment and extending in the left-right direction, the second support segment being connected with at least one of the first side plates, wherein the first connecting support is arranged on the lower side of the support beam and in the shape of a U-shaped structure with an opening downward, the upper end of the first connecting support being connected with the first support segment and the second support segment.

7. The seat of claim 3, wherein The driving mechanism further comprises a driving motor and a transmission assembly, the driving motor being arranged on the lower side of the fixed segment, the driving motor being connected with the push rod through the transmission assembly to drive the movable segment to move.

8. The seat of any one of claims 1-7, wherein, The back connecting support comprises two second side plates arranged in the left-right direction and a plurality of second cross beams extending in the left-right direction and connected between the two second side plates, the plurality of second cross beams being arranged in the up-down direction, the rear end of the push rod being rotatably connected with one of the second cross beams.

9. The seat of claim 8, wherein, The back connecting support further comprises a second connecting support fixed to the second cross beam and in the shape of an open forward U, the rear end of the push rod extends into the second connecting support and is formed with a third shaft hole penetrating the push rod along the radial direction of the push rod, the third rotating shaft is arranged in the third shaft hole and both ends thereof are fixed to the second connecting support.

10. The seat of claim 1, wherein, The backrest framework is an integral piece and comprises a seat plate part and a back plate part, the seat plate part extends forward and backward, the front end of the seat plate part is connected to the back connecting support, the back plate part is connected to the rear end of the seat plate part and extends upward, The periphery of the back plate part is formed with a flange extending forward, the flange extends along the periphery of the back plate part, and both ends of the flange in the periphery of the back plate part extend to be connected to the seat plate part.

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