A chair for improved comfort

Abstract

The application provides a chair with improved comfort, which comprises an upper back piece, a lower back piece, a back support and a bottom plate, the back support is rotatably arranged on the bottom plate, the upper back piece is rotatably arranged on the back support, the lower back piece is rotatably connected with the upper back piece, a transmission rod and a transmission device are further arranged between the upper back piece and the bottom plate, and when the back support is inclined backward, the transmission rod moves relative to the back support and drives the upper back piece to rotate relative to the back support, so as to reduce the included angle between the upper back piece and the lower back piece to wrap the human back, realize the function of wrapping along the back bending and improve the comfort.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of furniture, in particular to a chair for improving comfort. BACKGROUND

[0002] With the improvement of people's quality of life, the requirements for such commonly used furniture as chairs are also getting higher and higher, mainly in terms of use comfort. There are many scenarios for using chairs, especially in the office, where people spend almost all their working time with the chair. Therefore, it is the goal of manufacturers to provide people with a high-comfort office chair.

[0003] The chairs with high comfort on the market are generally leisure chairs or sofas, which often have thick and soft padding and are more comfortable to sit on than office chairs. Moreover, due to their large size, they can have more structures or devices inside to improve comfort. These are all things that office chairs cannot do, especially in terms of padding. Therefore, designing clever structures on office chairs to increase comfort has become the focus of manufacturers.

[0004] There is a leisure chair on the market. When a user leans back and lies down, the chair back can not only be tilted back, but also has the function of bending to fit the curvature of the human spine, so that the chair back itself deforms and the upper and lower parts form an angle to provide a wrapping feeling for the user, thereby improving comfort. However, the leisure chair is large in size and occupies space, so it is not suitable for use by employees during work. Moreover, the leisure chair on the market is adjusted by setting a gas rod in the chair back, which is slow and not smooth in movement, has poor effect, is large in size, and requires higher cost. Therefore, how to cleverly transplant the functions of the above-mentioned leisure chair to an office chair through structural design has become a key problem for improving the comfort of office chairs. SUMMARY

[0005] To solve the above technical problems, the present application provides a chair for improving comfort, which comprises an upper back piece, a lower back piece, a back support and a bottom disc. The back support is rotatably arranged on the bottom disc, the upper back piece is rotatably arranged on the back support, and the lower back piece is rotatably connected with the upper back piece. A transmission rod and a transmission device are further arranged between the upper back piece and the bottom disc. When the back support is tilted back, the transmission rod moves relative to the back support, thereby driving the upper back piece to rotate relative to the back support, so as to reduce the angle between the upper back piece and the lower back piece to wrap the back of the human body, realize the function of wrapping with the back bending, and improve the comfort.

[0006] The technical solution of the present application is as follows:

[0007] The application discloses a chair with improved comfort, which comprises an upper back piece, a lower back piece, a back support and a bottom plate, the back support is rotatably arranged on the bottom plate, the upper back piece is rotatably arranged on the back support, and the lower back piece is rotatably connected with the upper back piece; a transmission rod and a transmission device are further arranged between the upper back piece and the bottom plate, the two ends of the transmission rod are rotatably connected with the upper back piece and the transmission device respectively; when the back support is tilted backward, the transmission rod moves relative to the back support under the action of the transmission device, the upper back piece is rotated forward relative to the back support under the action of the transmission rod, the lower end of the upper back piece is close to the back support, and the included angle between the upper back piece and the lower back piece is reduced to wrap the back of a human body.

[0008] The conventional single chair back is divided into an upper back and a lower back, i.e. the upper back piece and the lower back piece, the opening and closing movement between the upper back piece and the lower back piece is realized through the rotation of the upper back piece relative to the back support, and the upper back piece and the lower back piece are synchronously relatively rotated to reduce the included angle therebetween when the chair back is tilted backward (i.e. when the back support is tilted backward), so that the office chair achieves the wrapping effect of the back bending of the leisure chair, the user can feel the wrapping feeling given by the upper back piece and the lower back piece when lying backward on the chair, and the comfort is improved. The relative rotation of the upper back piece and the back support is realized through the transmission device and the transmission rod, the transmission device is configured to drive the transmission rod to move relative to the back support when the chair back is tilted backward, the transmission rod bypasses the back support and is connected with the upper back piece alone, and the transmission rod can synchronously drive the upper back piece to move relative to the back support when the transmission rod moves relative to the back support; the clever structure is reasonable, the wrapping function of the back bending of the leisure chair is realized through the connecting rod mechanism, the problem of realizing the function through the air rod is solved, the adjustment is rapid and smooth, the effect is better, the required volume is reduced, the cost is saved, and the back adjusting function of the leisure chair can be transplanted to the office chair through the above scheme.

[0009] Preferably, the lower end of the transmission rod is connected with the transmission device, the upper end of the transmission rod is rotatably connected with the lower end of the upper back piece, and the rotatable connection point of the transmission rod and the upper back piece is located in front of the rotatable connection point of the back support and the upper back piece; the lower end of the lower back piece is rotatably connected with the transmission rod, and the upper end of the lower back piece is rotatably connected with the lower end of the upper back piece; when the back support is tilted backward, the lower end of the transmission rod moves forward, the upper end of the transmission rod moves backward, the lower end of the upper back piece and the upper end of the lower back piece are close to the back support, and the lower end of the lower back piece is far away from the back support. The rotatable connection point of the transmission rod and the upper back piece is located in front of the rotatable connection point of the back support and the upper back piece, and the two rotatable points have a distance, so that the transmission rod can drive the upper back piece to rotate relative to the back support when the transmission rod moves relative to the back support; the transmission rod can drive the lower back piece to move relative to the back support in addition to driving the upper back piece to rotate relative to the back support, and the upper end of the lower back piece is close to the back support and the lower end of the lower back piece is far away from the back support, so that the bending and opening of the chair back can be further realized.

[0010] As preferred, the distributing rod comprises a main rod, a first connecting rod at the upper end of the main rod, and a second connecting rod at the lower end of the main rod, the first connecting rod and the second connecting rod both protrude forward from the main rod; the first connecting rod is connected with the upper end of the upper back piece, and the second connecting rod is connected with the lower end of the lower back piece. The distributing rod is not a straight rod, but an F-shaped rod; the first connecting rod is used to form a space between the connecting point of the upper back piece and the back support and the connecting point of the upper back piece and the distributing rod, and the second connecting rod is used to support the lower part of the lower back piece, so that the upper back piece and the lower back piece form a reasonable continuous contact surface for the human back to be attached.

[0011] As preferred, the first connecting rod is integrally formed with the main rod, and the first connecting rod is inclined upward and forward relative to the main rod; the second connecting rod is rotationally connected with the main rod, and the rotation range of the second connecting rod relative to the main rod is 8-10°. The second connecting rod is rotationally connected with the main rod, and the second connecting rod is also rotationally connected with the lower back piece, so that the lower back piece is relatively flexible relative to the main rod, and does not hinder the opening and closing movement of the upper back piece and the lower back piece.

[0012] As preferred, the transmission device comprises a rotating piece, the rotating piece is rotationally arranged relative to the back support, and the distributing rod is rotationally connected with the rotating piece; the rotating piece is configured to drive the distributing rod to move relative to the back support when the rotating piece rotates relative to the back support. The rotating piece is rotationally arranged relative to the back support, and the distributing rod is connected with the rotating piece, so that the distributing rod moves relative to the back support when the rotating piece rotates, which is a clever and simple implementation.

[0013] As preferred, the transmission device further comprises a first connecting rod, a second connecting rod, an intermediate seat, and a swing rod; the intermediate seat is fixed relative to the back support and rotates synchronously with the back support relative to the chassis; one end of the first connecting rod is rotationally connected with the chassis, the upper end of the second connecting rod is rotationally connected with the other end of the first connecting rod, the lower end of the second connecting rod is rotationally connected with the intermediate seat, the swing rod is rotationally connected with the upper end of the second connecting rod, the rotating piece is rotationally arranged on the intermediate seat, and the front end of the rotating piece is rotationally connected with the swing rod, and the rear end of the rotating piece is rotationally connected with the distributing rod; when the back support is tilted backward, the back support rotates downward and backward relative to the chassis, and the intermediate seat fixed with the back support also rotates synchronously, thereby driving the second connecting rod to move downward and forward, the second connecting rod drives the first connecting rod to rotate downward and backward relative to the chassis, at the same time, the swing rod is pulled to move forward and downward, the swing rod pulls the rotating piece to rotate forward relative to the intermediate seat, thereby driving the distributing rod to move relative to the intermediate seat and the back support. The specific structure and connection mode of the transmission device, the chassis, the intermediate seat, the first connecting rod, and the second connecting rod constitute a four-link mechanism, and the chassis is configured as the main support and remains relatively stationary; when the intermediate seat and the first connecting rod rotate relative to the chassis, the second connecting rod remains substantially vertical; the movement of the transmission device is driven by the backward tilting of the back support when the back of the chair is tilted backward, so that the tilting of the back of the chair and the bending and wrapping of the upper and lower back pieces are synchronously performed.

[0014] As preferred, the intermediate seat extends rearward with a connecting seat, the connecting seat is hollow and formed with a receiving groove, the rotating member is located in the receiving groove and is rotatably connected with the connecting seat through a rotating shaft.

[0015] As preferred, the rotating member is triangular in shape, and the three corners thereof are the three rotating connection points.

[0016] As preferred, the back support is an L-shaped frame structure, and the back support comprises a horizontal frame and a vertical frame, the intermediate seat is inserted into the horizontal frame from bottom to top and is connected with the horizontal frame through bolts.

[0017] As preferred, the base plate comprises a seat shell and a base, the seat shell is fixedly connected with the base, the intermediate seat and the back support are rotatably connected with the seat shell, and the first connecting rod is rotatably connected with the base. The seat shell is wrapped outside the base, the back support can be connected outside the seat shell, the first connecting rod is connected with the base inside the seat shell, and the two can be rotatably connected with the base plate without conflict, compact in the front-rear direction and avoiding each other in the left-right direction, and the space arrangement is more reasonable.

[0018] As preferred, the lower back member is a frame structure, and the upper back member comprises an upper back frame and an upper back support, the upper back frame is fixedly connected with the upper back support.

[0019] As preferred, the upper back support comprises a third connecting rod extending forward, the third connecting rod is fixedly connected with the upper back frame and is rotatably connected with the upper end of the distributing rod. The distributing rod and the back support are rotatably connected with the lower end of the upper back member, the connection points of the distributing rod and the upper back member and the connection points of the back support and the upper back member are separated through the third connecting rod, and the upper back member can be rotated relative to the back support under the action of the distributing rod.

[0020] The design starting point, concept and beneficial effects of the present application adopting the above technical scheme are as follows:

[0021] The conventional single chair back is divided into an upper back and a lower back, i.e. an upper back piece and a lower back piece, and the opening and closing movement between the upper back piece and the lower back piece is realized by the rotation of the upper back piece relative to the back support, and at the same time when the chair back is tilted backward (i.e. when the back support is tilted backward), the upper back piece and the lower back piece are synchronously rotated relative to each other, the included angle between the upper back piece and the lower back piece is reduced, and the office chair achieves the effect of wrapping the back of the leisure chair, which enables the user to feel the wrapping effect of the upper back piece and the lower back piece when lying backward on the chair, thereby improving the comfort. The relative rotation of the upper back piece and the back support is realized by a transmission device and a distribution rod, the transmission device is configured to drive the distribution rod to move relative to the back support when the chair back is tilted backward, and the distribution rod bypasses the back support and is connected with the upper back piece alone, and when the distribution rod and the back support move relative to each other, the upper back piece can be synchronously driven to move relative to the back support; the structure is ingenious and reasonable, the function of wrapping the back of the leisure chair is realized by the linkage mechanism, the problem of using the gas rod to realize is solved, the adjustment is rapid and smooth, the effect is better, the required volume is reduced, the cost is saved, and the back adjustment function of the leisure chair can be transplanted to the office chair through the above scheme. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 For the chair back of the chair in the embodiment of the present application when the chair back is not tilted backward Figure 1 ;

[0023] Figure 2 For the chair back of the chair in the embodiment of the present application when the chair back is not tilted backward Figure 2 ;

[0024] Figure 3 For the chair back of the chair in the embodiment of the present application when the chair back is not tilted backward Figure 3 ;

[0025] Figure 4 For the chair back of the chair in the embodiment of the present application when the chair back is not tilted backward

[0026] Figure 5 For the chair back of the chair in the embodiment of the present application when the chair back is tilted backward Figure 1 ;

[0027] Figure 6 For the chair back of the chair in the embodiment of the present application when the chair back is tilted backward Figure 2 ;

[0028] Figure 7 For the chair back of the chair in the embodiment of the present application when the chair back is tilted backward Figure 3 ;

[0029] Figure 8 For the chair back of the chair in the embodiment of the present application when the chair back is tilted backward

[0030] Figure 9 Fig. 1 is a schematic view of the chair of the present application in an embodiment showing the movement of the parts when the back of the chair is bent around a person.

[0031] The reference signs are as follows: upper back piece 1, upper back frame 101, upper back bracket 102, third connecting rod 103, lower back piece 2, back bracket 3, horizontal frame 31, vertical frame 32, base 4, seat shell 41, base 42, distribution rod 5, main rod 51, first connecting rod 52, second connecting rod 53, rotating piece 6, first connecting rod 7, second connecting rod 8, intermediate base 9, connecting base 91, accommodating groove 92, rotating shaft 93, swinging rod 10. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0033] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, the terms "first", "second", "third" and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0035] The specific embodiments of the present application are as follows:

[0036] As shown in Figure 9 The present application provides a chair with improved comfort, which comprises an upper back piece 1, a lower back piece 2, a back bracket 3 and a base 4, the back bracket 3 is rotatably arranged on the base 4, the upper back piece 1 is rotatably arranged on the back bracket 3, and the lower back piece 2 is rotatably connected with the upper back piece 1; a distribution rod 5 and a transmission device are further arranged between the upper back piece 1 and the base 4, both ends of the distribution rod 5 are rotatably connected with the upper back piece 1 and the transmission device respectively; when the back bracket 3 is tilted backward, the distribution rod 5 moves relatively with the back bracket 3 under the action of the transmission device, the upper back piece 1 is rotated forward relative to the back bracket 3 under the action of the distribution rod 5, the lower end of the upper back piece 1 is close to the back bracket 3, and the included angle between the upper back piece 1 and the lower back piece 2 is reduced to wrap around the back of a person.

[0037] The traditional single chair back is divided into an upper back and a lower back, i.e. an upper back piece 1 and a lower back piece 2, and the opening and closing movement between the upper back piece 1 and the lower back piece 2 is realized by the rotation of the upper back piece 1 relative to the back support 3, and at the same time when the chair back is tilted backward (i.e. when the back support 3 is tilted backward), the upper back piece 1 and the lower back piece 2 synchronously rotate relative to each other, reducing the included angle therebetween, so that the office chair achieves the effect of wrapping with the back bending of the leisure chair, which enables the user to feel the wrapping feeling of the upper back piece 1 and the lower back piece 2 when lying backward on the chair, thereby improving the comfort. The relative rotation of the upper back piece 1 and the back support 3 is realized by a transmission device and a distribution rod 5, the transmission device is configured to drive the distribution rod 5 to move relative to the back support 3 when the chair back is tilted backward, and the distribution rod 5 bypasses the back support 3 and is connected with the upper back piece 1 alone, so that when the distribution rod 5 moves relative to the back support 3, the upper back piece 1 is synchronously driven to move relative to the back support 3; the structure is ingenious and reasonable, and the function of wrapping with the back bending of the leisure chair is realized through the linkage mechanism, thereby solving the problem of using the air rod to realize the function, making the adjustment quick and smooth, achieving better effect, reducing the required volume, saving the cost, and transplanting the back adjusting function of the leisure chair to the office chair through the above scheme.

[0038] The logic of realizing the wrapping with the back bending of the chair is that the chair back is first divided into two plates, i.e. an upper back and a lower back, and the upper back and the lower back are given the ability to open and close; further, the opening and closing ability is realized by the distribution rod 5 driving the upper back piece 1, so the distribution rod 5 should be able to move relative to the back support 3; further, the linkage assembly of the transmission device can drive the distribution rod 5 to move relative to the back support 3; specifically:

[0039] As shown in Figures 1-3 , 5-7, the traditional chair back is divided into an upper back piece 1 and a lower back piece 2, the upper back piece 1 includes an upper back frame 101 and an upper back support 102, the upper back frame 101 is a frame structure, the upper end of the upper back frame 101 is inserted into the upper end of the upper back support 102 and is fixedly connected by screws, and the lower end of the upper back frame 101 is also inserted into the lower end of the upper back support 102, so that the two are fixedly connected together; further, the upper back support 102 includes a third connecting rod 103 extending forward, the third connecting rod 103 is located at the lower end of the upper back support 102, the third connecting rod 103 is inclined forward and downward, the front end of the third connecting rod 103 is connected with the upper back frame 101, and the rear end of the third connecting rod 103 is connected with the lower end of the upper back support 102, the back support 3 is rotationally connected with the lower end of the upper back support 102, and the third connecting rod 103 increases the distance between the lower end of the upper back frame 101 and the back support 3; the lower back piece 2 is a frame structure, the upper end of the lower back piece 2 is rotationally connected with the lower end of the upper back frame 101, and the two can rotate relative to each other about the axis in the left-right direction to realize the opening and closing movement.

[0040] The opening and closing movement of the upper back piece 1 and the lower back piece 2 needs to be driven by the distribution rod 5: the lower end of the distribution rod 5 is connected with the transmission device, the upper end of the distribution rod 5 is rotationally connected with the lower end of the upper back piece 1, and the rotation connection point of the distribution rod 5 and the upper back piece 1 is located in front of the rotation connection point of the back support 3 and the upper back piece 1. Specifically, the lower end of the upper back frame 101 is inserted with the front end of the third connecting rod 103, and the upper end of the distribution rod 5 is also inserted into the position, and is rotationally connected with the upper back piece 1 through a rotating shaft. The third connecting rod 103 is provided with a notch in front of and behind the upper end of the distribution rod 5, so as to provide space for the rotation of the distribution rod 5. Because the third connecting rod 103 increases the distance between the lower end of the upper back frame 101 and the back support 3, the distance between the two rotation connection points is provided, the distribution rod 5 and the back support 3 are rotationally connected with the lower end of the upper back piece 1, the third connecting rod 103 separates the connection point of the distribution rod 5 and the upper back piece 1 and the connection point of the back support 3 and the upper back piece 1, and then the upper back piece 1 can rotate relative to the back support 3 under the action of the distribution rod 5, that is, the upper back piece 1 and the back support 3 can rotate relative to the left-right direction axis.

[0041] The lower end of the lower back piece 2 is rotationally connected with the distribution rod 5, and the upper end of the lower back piece 2 is rotationally connected with the lower end of the upper back piece 1. When the back support 3 is tilted backward, the lower end of the distribution rod 5 moves forward, the upper end of the distribution rod 5 moves backward, the lower end of the upper back piece 1 moves backward to approach the back support 3, and the lower end of the lower back piece 2 moves forward to move away from the back support 3. The rotation connection point of the distribution rod 5 and the upper back piece 1 is located in front of the rotation connection point of the back support 3 and the upper back piece 1, and the distance between the two rotation points is provided, so that the distribution rod 5 can drive the upper back piece 1 to rotate relative to the back support 3 when moving relative to the back support 3. If the two connection points are located at the same position, the distribution rod 5 cannot drive the upper back piece 1 to rotate relative to the back support 3. In addition to driving the upper back piece 1 to rotate relative to the back support 3, the movement of the distribution rod 5 can also drive the lower back piece 2 to move relative to the back support 3, and the upper end of the lower back piece 2 approaches the back support 3, and the lower end moves away from the back support 3, which can further realize the bending and opening of the chair back.

[0042] Further, as shown in FIG. 6, Figure 4 , 8As shown, the distributing rod 5 comprises a main rod 51, a first connecting rod 52 at the upper end of the main rod 51, and a second connecting rod 53 at the lower end of the main rod 51, the first connecting rod 52 and the second connecting rod 53 both protrude forward from the main rod 51; the first connecting rod 52 is connected with the upper end of the upper back piece 1, and the second connecting rod 53 is connected with the lower end of the lower back piece 2; the distributing rod 5 is not a straight rod, but an approximately F-shaped rod; the first connecting rod 52 is used to be rotationally connected with the front end of the third connecting rod 103, and the two are cooperated to form a space between the connecting point of the upper back piece 1 and the back support 3 and the connecting point of the upper back piece 1 and the distributing rod 5, and the second connecting rod 53 is used to support the lower part of the lower back piece 2, so that the lower back piece 2 and the upper back piece 1 form a reasonable continuous contact surface for the human back to be attached; the first connecting rod 52 is integrally formed with the main rod 51, and the first connecting rod 52 is inclined upward and forward relative to the main rod 51, and the second connecting rod 53 is rotationally connected with the main rod 51, and the rotation range of the second connecting rod 53 and the main rod 51 is 8-10°; the second connecting rod 53 is rotationally connected with the main rod 51, and the second connecting rod 53 is also rotationally connected with the lower back piece 2, so that the lower back piece 2 and the main rod 51 are relatively flexible, and will not hinder the opening and closing movement of the upper back piece 1 and the lower back piece 2.

[0043] The transmission device can have various options, as long as it can drive the distributing rod 5 to rotate relative to the back support 3, in the embodiment, since it is a big problem to transplant the back bending and wrapping function to the office chair type chair, a simple and ingenious structure is preferentially selected: the transmission device comprises a rotating piece 6, the rotating piece 6 is rotationally arranged relative to the back support 3, the distributing rod 5 is rotationally connected with the rotating piece 6, and the rotating piece 6 is configured to drive the distributing rod 5 to move relative to the back support 3 when the rotating piece 6 rotates relative to the back support 3. Specifically:

[0044] As Figures 1-9As shown, the transmission device comprises the first connecting rod 7, the second connecting rod 8, the intermediate seat 9, the swing rod 10 and the rotating member 6, the intermediate seat 9 is fixedly connected with the back support 3, the intermediate seat 9 and the back support 3 are rotationally connected with the chassis 4, one end of the first connecting rod 7 is rotationally connected with the chassis 4, the upper end of the second connecting rod 8 is rotationally connected with the other end of the first connecting rod 7, the lower end of the second connecting rod 8 is rotationally connected with the intermediate seat 9, the chassis 4, the intermediate seat 9, the first connecting rod 7 and the second connecting rod 8 form a four-connecting-rod mechanism, and the chassis 4 is configured as a main support and keeps relatively static; when the intermediate seat 9 and the first connecting rod 7 rotate relative to the chassis 4, the second connecting rod 8 keeps substantially vertical; the swing rod 10 is rotationally connected with the upper end of the second connecting rod 8, the rotating member 6 is rotationally arranged on the intermediate seat 9, and the front end of the rotating member 6 is rotationally connected with the swing rod 10, and the rear end of the rotating member 6 is rotationally connected with the distributing rod 5; when the backrest is inclined backward, the back support 3 rotates downward and backward relative to the chassis 4, and the intermediate seat 9 fixedly connected with the back support 3 also synchronously rotates, thereby driving the second connecting rod 8 to move downward and forward, the second connecting rod 8 drives the first connecting rod 7 to rotate downward and backward relative to the chassis 4, simultaneously pulls the swing rod 10 to move forward and downward, the swing rod 10 pulls the rotating member 6 to rotate forward relative to the intermediate seat 9, thereby driving the distributing rod 5 to move relative to the intermediate seat 9 and the back support 3; the movement of each connecting rod in the transmission device is driven by the backward inclination of the back support 3 when the backrest is inclined backward, and the movement of the back support 3 causes the linkage of each connecting rod in the transmission device when the human body is inclined backward on the chair, thereby realizing the synchronous performance of the backward inclination of the backrest and the bending of the upper and lower back members 2, smooth action and more comfortable use.

[0045] In the four-connecting-rod mechanism composed of the chassis 4, the intermediate seat 9, the first connecting rod 7 and the second connecting rod 8, the configuration of the connection point positions and the distances between the connection points makes the second connecting rod 8 keep substantially vertical in the movement, thereby making the second connecting rod 8 play a role of pulling the swing rod 10.

[0046] The rotating member 6 is triangular in shape, and its three corners are exactly three rotational connection points, i.e., the upper end of the rotating member 6 is rotationally connected with the intermediate seat 9, the front end of the rotating member 6 is rotationally connected with the rear end of the swing rod 10, and the rear end of the rotating member 6 is rotationally connected with the lower end of the distributing rod 5; the intermediate seat 9 rearwardly extends a connecting seat 91, the connecting seat 91 is hollow and formed with a receiving groove 92, the rotating member 6 is located in the receiving groove 92 and rotationally connected with the connecting seat 91 through a rotating shaft 93; the connecting seat 91 is open in the up-down direction, the rotating member 6 is arranged in the receiving groove 92 of the connecting seat 91, the lower end of the distributing rod 5 is located in the receiving groove 92 and rotationally connected with the rotating member 6, and the connecting seat 91 rearwardly extends beyond the body of the intermediate seat 9, so that the distributing rod 5 has a movement space and does not interfere with the intermediate seat 9 when moving.

[0047] The back support 3 is an L-shaped frame structure, and comprises a horizontal frame 31 and a vertical frame 32. The intermediate seat 9 is inserted into the horizontal frame 31 from bottom to top and is connected by bolts. After the intermediate seat 9 is inserted into the back support 3, the two form an integral whole without damaging the integrity and aesthetics. The purpose of separate molding is to simplify the structure of the two and reduce the mold opening and production cost.

[0048] The chassis 4 comprises a seat shell 41 and a base 42. The seat shell 41 is fixedly connected with the base 42. The intermediate seat 9 and the back support 3 are rotatably connected with the seat shell 41. The first connecting rod 7 is rotatably connected with the base 42. The seat shell 41 is wrapped outside the base 42. The back support 3 can be connected outside the seat shell 41. The first connecting rod 7 is connected with the base 42 inside the seat shell 41. The two can be rotatably connected with the chassis 4 without conflict. In the front-rear direction, they are compact while avoiding each other in the left-right direction. The space arrangement is more reasonable.

Claims

1. A chair for enhanced comfort, characterized in that: The backrest comprises an upper back piece, a lower back piece, a back support and a base plate, the back support is rotatably arranged on the base plate, the upper back piece is rotatably arranged on the back support, and the lower back piece is rotatably connected with the upper back piece; a transmission rod and a transmission device are further arranged between the upper back piece and the base plate, two ends of the transmission rod are rotatably connected with the upper back piece and the transmission device respectively; when the back support is tilted backward, the transmission rod moves relative to the back support under the action of the transmission device, the upper back piece is tilted forward relative to the back support under the action of the transmission rod, the lower end of the upper back piece is close to the back support, the included angle between the upper back piece and the lower back piece is reduced to wrap the back of the human body; the lower end of the transmission rod is connected with the transmission device, the upper end of the transmission rod is rotatably connected with the lower end of the upper back piece, and the rotatable connection point between the transmission rod and the upper back piece is located in front of the rotatable connection point between the back support and the upper back piece; the lower end of the lower back piece is rotatably connected with the transmission rod, and the upper end of the lower back piece is rotatably connected with the lower end of the upper back piece; when the back support is tilted backward, the lower end of the transmission rod moves forward, the upper end of the transmission rod moves backward, the lower end of the upper back piece and the upper end of the lower back piece are close to the back support, and the lower end of the lower back piece is away from the back support.

2. The chair of claim 1, wherein: The transmission rod comprises a main rod, a first connecting rod arranged at the upper end of the main rod and a second connecting rod arranged at the lower end of the main rod, and the first connecting rod and the second connecting rod are both protruded forward from the main rod; the first connecting rod is connected with the upper end of the upper back piece, and the second connecting rod is connected with the lower end of the lower back piece.

3. The chair of claim 2, wherein: The first connecting rod is integrally formed with the main rod, the first connecting rod is inclined upward and forward relative to the main rod, the second connecting rod is rotatably connected with the main rod, and the rotation range of the second connecting rod relative to the main rod is 8-10°.

4. The chair of claim 1, wherein: The transmission device comprises a rotating piece, the rotating piece is rotatably arranged relative to the back support, the transmission rod is rotatably connected with the rotating piece, and the rotating piece is configured to drive the transmission rod to move relative to the back support when the rotating piece rotates relative to the back support.

5. The chair of claim 4, wherein: The transmission device further comprises a first connecting rod, a second connecting rod, an intermediate seat and a swing rod, the intermediate seat is fixed relative to the back support and synchronously rotates with the back support relative to the base plate; one end of the first connecting rod is rotatably connected with the base plate, the upper end of the second connecting rod is rotatably connected with the other end of the first connecting rod, the lower end of the second connecting rod is rotatably connected with the intermediate seat, the swing rod is rotatably connected with the upper end of the second connecting rod, the rotating piece is rotatably arranged on the intermediate seat, the front end of the rotating piece is rotatably connected with the swing rod, and the rear end of the rotating piece is rotatably connected with the transmission rod; when the back support is tilted backward, the back support is tilted downward and backward relative to the base plate, the intermediate seat fixed with the back support is also synchronously tilted, thereby driving the second connecting rod to move downward and forward, the second connecting rod drives the first connecting rod to tilt downward and backward relative to the base plate, simultaneously pulls the swing rod to move forward and downward, the swing rod pulls the rotating piece to rotate forward relative to the intermediate seat, thereby driving the transmission rod to move relative to the intermediate seat and the back support.

6. The chair of claim 5, wherein: The intermediate seat extends rearward to form a connecting seat, the connecting seat is hollow and forms a receiving groove, and the rotating piece is located in the receiving groove and is rotatably connected with the connecting seat through a rotating shaft.

7. The chair of claim 5, wherein: The shape of the rotating piece is triangular.

8. The chair of claim 5, wherein: The back support is an L-shaped frame structure, the back support comprises a horizontal frame and a vertical frame, and the intermediate seat is inserted into the horizontal frame from bottom to top and is connected through bolts.

9. The chair of claim 5, wherein: The base plate comprises a seat shell and a base, the seat shell is fixedly connected with the base, the intermediate seat and the back support are rotationally connected with the seat shell, and the first connecting rod is rotationally connected with the base.

10. The chair of claim 1, wherein: The lower back piece is a frame structure, and the upper back piece comprises an upper back frame and an upper back support, the upper back frame is fixedly connected with the upper back support; the upper back frame is a frame structure, and the upper back support is rotationally connected with the upper end of the back support.

11. The chair of claim 10, wherein: The upper back support comprises a third connecting rod extending forward, the third connecting rod is fixedly connected with the upper back frame and rotationally connected with the upper end of the distributing rod.

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