Chair with enhanced comfort

Abstract

To provide a chair that enhances comfort, a chair including: an upper backrest part; a lower backrest part; a backrest bracket; and a chassis.SOLUTION: A backrest bracket is rotatably set on a chassis; an upper backrest part is rotatably set on the backrest bracket; a lower backrest part is rotatably connected to the upper backrest part; and a transfer rod and a transmission are set between the upper backrest part and the chassis. Thereby, with the backrest bracket inclines backward, the transfer rod is relatively displaced for the backrest bracket; the upper backrest part is driven by the transfer rod to rotate for the backrest bracket; an angle between the upper backrest part and the lower backrest part decreases; and, in a manner that the back of a person is wrapped up, the curvature of the chair backrest and a function of the wrapping up are materialized, with comfort enhanced.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to the field of furniture, in particular to chairs that increase comfort. [Background technology]

[0002] As people's quality of life improves, the demands on chairs and other furniture that we use every day are getting higher and higher, mainly reflected in the comfort of sitting. Chairs are used in a wide variety of situations, especially in the office, where people spend almost all their time in their chairs, so providing people with highly comfortable office chairs is the goal that manufacturers pursue.

[0003] The most common high comfort chairs on the market are leisure chairs and sofas. They often use thick and soft fillings, and are more comfortable to sit on than office chairs. Also, because of their larger size, more structures and devices can be installed inside to improve comfort. These are things that office chairs cannot do, especially in terms of fillings, and therefore designing clever structures to add comfort-improving features to office chairs has become an important research direction for manufacturers.

[0004] In conventional leisure chairs, when the user leans back on the chair, in addition to the reclining function, the chair back also has the function of curving to match the curvature of the human spine. It also has the function of deforming the chair back itself. The chair back deforms itself and gives a feeling of being wrapped by angling the upper and lower parts, improving the sitting comfort. However, leisure chairs are large in size and take up space, so they are not suitable for use in offices. In addition, commercially available leisure chairs are adjusted by installing air rods on the chair back, which makes the adjustment slow, not smooth, less effective, large in volume, and expensive. Therefore, in order to improve the comfort of office chairs, it is an important issue how to successfully transfer the functions of the leisure chairs mentioned above to office chairs through structural design. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve the above technical problems, the present invention provides a chair with improved comfort, which includes an upper backrest, a lower backrest, a backrest bracket and a chassis. The backrest bracket is rotatably installed on the chassis, the upper backrest is rotatably installed on the backrest bracket, the lower backrest and the upper backrest are rotatably connected, and a transfer rod and a transmission device are installed between the upper backrest and the chassis. In addition, when the backrest bracket is tilted backward, the transfer rod moves relative to the backrest bracket, and the upper backrest is driven to rotate relative to the backrest bracket, so that the angle between the upper backrest and the lower backrest is reduced to wrap around the human back, thereby realizing the function of bending and wrapping with the back, and improving comfort. [Means for solving the problem]

[0006] The technical solution of the present invention is realized as follows: A chair for improving comfort includes an upper backrest portion, a lower backrest portion, a backrest bracket, and a chassis, the backrest bracket is rotatably installed on the chassis, the upper backrest portion is rotatably installed on the backrest bracket, the lower backrest portion and the upper backrest portion are rotatably connected, and a transfer rod and a transmission device are installed between the upper backrest portion and the chassis. Both ends of the transfer rod are rotatably connected to the upper backrest portion and the transmission device, respectively. When the backrest bracket is tilted backward, the transfer rod and the backrest bracket move relative to each other under the action of the transmission device, and the upper backrest portion rotates forward relative to the backrest bracket under the action of the transfer rod. The lower end of the upper backrest portion moves backward and approaches the backrest bracket, reducing the angle between the upper backrest portion and the lower backrest portion, and enveloping the back.

[0007] A conventional single backrest is divided into an upper part and a lower part, that is, an upper backrest part and a lower backrest part. The rotation of the upper backrest part relative to the backrest bracket realizes the opening and closing action between the upper backrest part and the lower backrest part. When the backrest of the chair is tilted backward (i.e., when the backrest bracket is tilted backward), the upper backrest part and the lower backrest part rotate relatively at the same time, and the angle between them becomes small, so that the office chair can obtain an enveloping effect by the curve of the backrest like a leisure chair. This effect provides a feeling of being enveloping by the upper backrest part and the lower backrest part when lying on one's back, improving comfort. The relative rotation of the upper backrest part and the backrest bracket is achieved through a transmission device and a transfer rod, and the transmission device is configured to drive the transfer rod to move relative to the backrest bracket when the backrest of the chair is tilted backward. The transfer rod bypasses the backrest bracket and is connected solely to the upper backrest part. When the transfer rod and the backrest bracket move relative to each other, the upper backrest part is driven and can move relative to the backrest bracket at the same time. With its ingenious design and reasonable structure, the bending and wrapping function of the backrest of the leisure chair is realized by the interlocking mechanism. This solves the problem of using the air rod, makes the adjustment quick and smooth, improves the effect, reduces the required volume, and reduces the cost. In addition, the above solution allows the backrest adjustment function of the leisure chair to be transplanted to the office chair.

[0008] Preferably, the lower end of the transfer rod is connected to the transmission device, the upper end of the transfer rod is rotatably connected to the lower end of the upper backrest part, and the rotation connection point between the transfer rod and the upper backrest part is located forward of the rotation connection point between the backrest bracket and the upper backrest part. The lower end of the lower backrest part is rotatably connected to the transfer rod, and the upper end of the lower backrest part is rotatably connected to the lower end of the upper backrest part. When the backrest bracket is tilted backward, the lower end of the transfer rod moves forward, the upper end of the transfer rod moves backward, the lower end of the upper backrest part and the upper end of the lower backrest part move backward and approach the backrest bracket, and the lower end of the lower backrest part moves forward and away from the backrest bracket. The rotation connection point between the transfer rod and the upper backrest part is located forward of the rotation connection point between the backrest bracket and the upper backrest part. Since there is a distance between the two rotation points, when the transfer rod moves relative to the backrest bracket, the upper backrest part is driven to rotate relative to the backrest bracket. The movement of the transfer rod can not only drive the upper backrest part to rotate relative to the backrest bracket, but also drive the lower backrest part to move relative to the backrest bracket. And since the upper end of the lower backrest part is close to the backrest bracket and the lower end is away from the backrest bracket, it can further realize the bending and opening / closing of the chair back.

[0009] Preferably, the transfer rod includes a main rod, a first connecting rod located at the upper end of the main rod, and a second connecting rod located at the lower end of the main rod, and both the first connecting rod and the second connecting rod protrude forward from the main rod. The first connecting rod is connected to the upper end of the upper backrest part, and the second connecting rod is connected to the lower end of the lower backrest part. The transfer rod is not a simple rod, but is shaped like an F. The purpose of the first connecting rod is to form a space between the connection point of the upper backrest part and the backrest bracket and the connection point of the upper backrest part and the transfer rod. The purpose of the second connecting rod is to support the lower part of the lower backrest part, and the lower backrest part and the upper backrest part form a suitable and continuous fitting surface for leaning against the back of the human body.

[0010] Preferably, the first connecting rod is integral with the main rod, the first connecting rod is inclined forward and upward with respect to the main rod, the second connecting rod is rotatably connected to the main rod, and the rotation range of the second connecting rod and the main rod is 8 to 10 degrees. Since the second connecting rod is rotatably connected to the main rod and also rotatably connected to the lower backrest portion, the space between the lower backrest portion and the main rod is flexible, and opening and closing operations of the upper backrest portion and the lower backrest portion are not hindered.

[0011] Preferably, the transmission device includes a rotating member, the rotating member is rotatably mounted relative to the backrest bracket, and the transfer rod is rotatably connected to the rotating member. When the rotating member rotates relative to the backrest bracket, the rotating member is configured to drive the transfer rod to move relative to the backrest bracket. Both the rotating member and the backrest bracket rotate, and the transfer rod is connected to the rotating member, whereby when the rotating member rotates, the transfer rod is driven to move relative to the backrest bracket. This implementation method is ingenious and simple.

[0012] Preferably, the transmission device further includes a first connecting rod, a second connecting rod, an intermediate seat, and a swing rod. The intermediate seat is fixed relative to the backrest bracket and rotates synchronously with the backrest bracket relative to the chassis. One end of the first connecting rod is rotatably connected to the chassis, an upper end of the second connecting rod is rotatably connected to the other end of the first connecting rod, a lower end of the second connecting rod is rotatably connected to the intermediate seat, the swing rod is rotatably connected to the upper end of the second connecting rod, a rotating member is rotatably attached to the intermediate seat, a front end of the rotating member is rotatably connected to the swing rod, and a rear end of the rotating member is rotatably connected to the transfer rod. When the backrest bracket tilts backward, the backrest bracket rotates downward and backward relative to the chassis, and the intermediate seat fixed to the backrest bracket also rotates synchronously, which drives 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 moves forward and downward, and the swing rod drives the rotating member to rotate forward relative to the middle seat, which in turn drives the transfer rod to move relative to the middle seat and backrest bracket. The specific structure and connection method of the transmission device is a four-rod linkage mechanism consisting of the chassis, the middle seat, the first connecting rod and the second connecting rod. The chassis is configured as the main support that remains relatively stationary. As the middle seat and the first connecting rod rotate relative to the chassis, the second connecting rod holds them approximately vertically. The backward tilt of the backrest bracket when tilting the chair backward drives the movement of the transmission device, and the chair tilts backward, and the upper and lower backrest parts are curved and wrapped at the same time.

[0013] Preferably, the intermediate sheet extends rearward and has a connecting base attached thereto. The connecting base is hollow and forms a receiving groove. The rotating member is disposed in the receiving groove and rotatably connected to the connecting base via a rotating shaft. The connecting base is open in the vertical direction, the rotating member is disposed in the receiving groove of the connecting base, the lower end of the transfer rod is located in the receiving groove and rotatably connected to the rotating member, and the connecting base extends rearward beyond the intermediate sheet body, so that there is sufficient room for the transfer rod to move and the transfer rod does not interfere with the intermediate sheet.

[0014] Preferably, the shape of the rotating member is triangular, the three corners of which are the three rotational connection points.

[0015] Preferably, the backrest bracket is an L-shaped frame structure including a horizontal frame and a vertical frame, and the intermediate sheet is inserted into the horizontal frame from bottom to top and connected by bolts. After the intermediate sheet and the backrest bracket are inserted, they form an integrated whole without compromising the integrity and aesthetics. The purpose of molding separately is to simplify the two structures and reduce the mold opening and manufacturing costs.

[0016] Preferably, the chassis includes a seat shell and a base, the seat shell is fixedly connected to the base, the middle seat and backrest bracket are rotatably connected to the seat shell, and the first connecting rod is rotatably connected to the base. The seat shell is covered by the outside of the base, the backrest bracket is connected to the outside of the seat shell, and the first connecting rod is connected to the base inside the seat shell. Both can be rotatably connected to the chassis without colliding. It is compact in the front-rear direction and can avoid each other in the left-right direction at the same time, and the space arrangement is more reasonable.

[0017] Preferably, the lower backrest is a frame structure, the upper backrest includes an upper backrest frame and an upper backrest bracket, the upper backrest frame and the upper backrest bracket are fixedly connected, and the lower end of the upper backrest frame is rotatably connected to the upper end of the backrest bracket.

[0018] Preferably, the upper backrest bracket includes a third connecting rod extending forward, the third connecting rod being fixedly connected to the upper backrest frame and rotatably connected to an upper end of the transfer rod. Both the transfer rod and the backrest bracket are rotatably connected to a lower end of the upper backrest. The third connecting rod separates a connection point between the transfer rod and the upper backrest from a connection point between the backrest bracket and the upper backrest. This allows the upper backrest to rotate relative to the backrest bracket under the action of the transfer rod. Effect of the Invention

[0019] The design starting point, concept and beneficial effects of the present invention adopting the above technical solutions are as follows:

[0020] A conventional single backrest is divided into an upper part and a lower part, that is, an upper backrest part and a lower backrest part. The rotation of the upper backrest part relative to the backrest bracket realizes the opening and closing action between the upper backrest part and the lower backrest part. When the backrest of the chair is tilted backward (i.e., when the backrest bracket is tilted backward), the upper backrest part and the lower backrest part rotate relatively at the same time, and the angle between them becomes small, so that the office chair can obtain an enveloping effect by the curve of the backrest like a leisure chair. This effect provides a feeling of being enveloping by the upper backrest part and the lower backrest part when lying on one's back, improving comfort. The relative rotation of the upper backrest part and the backrest bracket is achieved through a transmission device and a transfer rod, and the transmission device is configured to drive the transfer rod to move relative to the backrest bracket when the backrest of the chair is tilted backward. The transfer rod bypasses the backrest bracket and is connected solely to the upper backrest part. When the transfer rod and the backrest bracket move relative to each other, the upper backrest part is driven and can move relative to the backrest bracket at the same time. With its ingenious design and reasonable structure, the bending and wrapping function of the backrest of the leisure chair is realized by the interlocking mechanism. This solves the problem of using the air rod, makes the adjustment quick and smooth, improves the effect, reduces the required volume, and reduces the cost. In addition, the above solution allows the backrest adjustment function of the leisure chair to be transplanted to the office chair. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic diagram showing a three-dimensional structure of a chair when the backrest of the chair is not tilted backward in an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing a three-dimensional structure of a chair when the backrest of the chair is not tilted backward in the embodiment of the present invention. [Diagram 3] FIG. 3 is a schematic diagram showing a three-dimensional structure of a chair when the backrest of the chair is not tilted backward in the embodiment of the present invention. [Figure 4] 1 is a cross-sectional view of a chair in an embodiment of the present invention when the backrest of the chair is not tilted backward. [Diagram 5] 1 is a schematic diagram showing a three-dimensional structure of a chair when the backrest of the chair is tilted backward in an embodiment of the present invention. FIG. [Figure 6] FIG. 2 is a schematic diagram showing a three-dimensional structure of a chair when the backrest of the chair is tilted backward in the embodiment of the present invention. [Figure 7] FIG. 3 is a schematic diagram showing a three-dimensional structure of a chair when the backrest of the chair is tilted backward in the embodiment of the present invention. [Figure 8] 1 is a cross-sectional view of a chair when the backrest of the chair is tilted backward in an embodiment of the present invention. [Figure 9] 1A to 1C are schematic diagrams showing the movement of each part when the backrest of a chair in an embodiment of the present invention is curved and enveloping. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] In order to make the above objects, features and advantages of the present invention more clearly comprehensible, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless inconsistent, the embodiments and features of the embodiments in the present application can be combined with each other.

[0023] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention; however, the scope of protection of the present invention is not limited to the specific embodiments disclosed below, as the present invention may be practiced in ways other than those described herein.

[0024] In describing the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0025] Specific embodiments of the present invention are as follows:

[0026] As shown in FIG. 9, the present invention provides a chair for improving comfort, which includes an upper backrest part 1, a lower backrest part 2, a backrest bracket 3, and a chassis 4. The backrest bracket 3 is rotatably disposed on the chassis 4, the upper backrest part 1 is rotatably installed on the backrest bracket 3, and the lower backrest part 2 is rotatably connected to the upper backrest part 1. A transfer rod 5 and a transmission device are also installed between the upper backrest part 1 and the chassis 4, and both ends of the transfer rod 5 are rotatably connected to the upper backrest part 1 and the transmission device, respectively. When the backrest bracket 3 tilts backward, the transfer rod 5 and the backrest bracket 3 move relative to each other under the action of the transmission device. The upper backrest part 1 rotates forward relative to the backrest bracket 3 under the action of the transfer rod 5, and the lower end of the upper backrest part 1 tilts backward and moves closer to the backrest bracket 3. The angle between the upper backrest portion 1 and the lower backrest portion 2 is small so that the back is wrapped around.

[0027] A single backrest as in the past is divided into an upper part and a lower part, that is, into an upper backrest part 1 and a lower backrest part 2. The rotation of the upper backrest part 1 relative to the backrest bracket 3 realizes the opening and closing action between the upper backrest part 1 and the lower backrest part 2. When the backrest of the chair is tilted backward (i.e., when the backrest bracket 3 is tilted backward), the upper backrest part 1 and the lower backrest part 2 rotate relatively at the same time, and the angle between them becomes smaller, so that the office chair can obtain the backrest curve and the enveloping effect like a leisure chair, and when the user lies on his / her back, he / she can feel the enveloping sensation of the upper backrest part 1 and the lower backrest part 2, improving comfort. The relative rotation of the upper backrest part 1 and the backrest bracket 3 is performed via a transmission device and a transfer rod 5. The transmission device is configured to drive the transfer rod 5 to move relative to the backrest bracket 3 when the chair back is tilted backward, and the transfer rod 5 bypasses the backrest bracket 3 and is independently connected to the upper backrest part 1. Therefore, when the transfer rod 5 and the backrest bracket 3 move relative to each other, the upper backrest part 1 can be synchronously driven to move relative to the backrest bracket 3. With an original design and reasonable structure, the bending and wrapping function of the backrest of the leisure chair is realized by the interlocking mechanism. This solves the problem of using the air rod, makes the adjustment quick and smooth, improves the effect, reduces the required volume, and reduces the cost. In addition, the above solution allows the backrest adjustment function of the leisure chair to be transplanted to the office chair.

[0028] The mechanism of the chair back bending and enveloping function is firstly to divide the chair back into two parts, upper and lower, and to give the upper and lower parts of the back a function of opening and closing. Furthermore, the opening and closing function is realized by the upper back part 1 driven by the transfer rod 5, so that the transfer rod 5 can move relative to the back bracket 3. Furthermore, the transfer rod 5 moves relative to the back bracket 3 by driving the connecting rod assembly member of the transmission. Specifically, it is as follows.

[0029] As shown in Figures 1-3 and 5-7, the backrest of a conventional chair is divided into an upper backrest section 1 and a lower backrest section 2. The upper backrest section 1 includes an upper backrest frame 101 and an upper backrest bracket 102. The upper backrest frame 101 is a frame-type structure, and the upper end of the upper backrest frame 101 and the upper end of the upper backrest bracket 102 are connected by screws after being inserted, and the lower end of the upper backrest frame 101 and the lower end of the upper backrest bracket 102 are also inserted into each other, thus the two are fixedly connected to each other, and further, the upper backrest bracket 102 includes a third connecting rod 103 extending forward, and the third connecting rod 103 is located at the lower end of the upper backrest bracket 102. The third connecting rod 103 is inclined forward and downward, with its front end connected to the upper backrest frame 101 and its rear end connected to the lower end of the upper backrest bracket 102. The backrest bracket 3 is rotatably connected to the lower end of the upper backrest bracket 102, and the third connecting rod 103 increases the distance between the lower end of the upper backrest frame 101 and the backrest bracket 3. The lower backrest 2 has a frame structure, and the upper end of the lower backrest 2 is rotatably connected to the lower end of the upper backrest frame 101, and the two rotate relatively around the left and right axes to realize opening and closing operations.

[0030] The opening and closing operation of the upper backrest portion 1 and the lower backrest portion 2 needs to be driven by the transfer rod 5. The lower end of the transfer rod 5 is connected to the transmission device, and the upper end of the transfer rod 5 is connected to the lower end of the upper backrest portion 1. Furthermore, the rotation connection point between the transfer rod 5 and the upper backrest portion 1 is located forward of the rotation connection point between the backrest bracket 3 and the upper backrest portion 1. Specifically, the lower end of the upper backrest portion frame 101 is inserted and connected to the front end of the third connecting rod 103, and at the same time, the upper end of the transfer rod 5 is also inserted at this position and rotatably connected to the upper backrest portion 1 through the rotation shaft. The third connecting rod 103 in front of and behind the upper end of the transfer rod 5 is provided with a gap that provides a space for the rotation of the transfer rod 5. The third connecting rod 103 increases the distance between the lower end of the upper backrest portion frame 101 and the backrest bracket 3, so that there is a distance between the two rotation connection points. Both the transfer rod 5 and the backrest bracket 3 are rotatably connected to the lower end of the upper backrest portion 1. The connection point between the transfer rod 5 and the upper backrest portion 1 and the connection point between the backrest bracket 3 and the upper backrest portion 1 are separated via a third connecting rod 103. Therefore, the action of the transfer rod 5 allows the upper backrest portion 1 to rotate relatively to the backrest bracket 3. That is, the upper backrest portion 1 and the backrest bracket 3 are relatively rotatable around an axis in the left-right direction.

[0031] The lower end of the lower backrest part 2 is rotatably connected to the transfer rod 5, and the upper end of the lower backrest part 2 is rotatably connected to the lower end of the upper backrest part 1. When the backrest bracket 3 tilts backward, the lower end of the transfer rod 5 moves forward, the upper end of the transfer rod 5 moves backward, the lower end of the upper backrest part 1 and the upper end of the lower backrest part 2 move backward and approach the backrest bracket 3, and the lower end of the lower backrest part 2 moves forward and away from the backrest bracket 3. The rotation connection point between the transfer rod 5 and the upper backrest part 1 is located forward of the rotation connection point between the backrest bracket 3 and the upper backrest part 1, and there is a distance between the two rotation points. Therefore, when the transfer rod 5 moves relative to the backrest bracket 3, it can drive the upper backrest part 1 to rotate relative to the backrest bracket 3. Conversely, if the two connection points are in the same place, the transfer rod 5 cannot rotate the upper backrest portion 1 relative to the backrest bracket 3. The transfer rod 5 not only drives the upper backrest portion 1 to rotate relative to the backrest bracket 3, but also drives the lower backrest portion 2 to move relative to the backrest bracket 3. Then, the upper end of the lower backrest portion 2 approaches the backrest bracket 3 and its lower end moves away from the backrest bracket 3, which further realizes the bending and opening / closing of the backrest of the chair.

[0032] As shown in FIG. 4 and FIG. 8, the transfer rod 5 includes 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 to the upper end of the upper backrest part 1, and the second connecting rod is connected to the lower end of the lower backrest part 2. The transfer rod is not a simple rod, but has a shape close to an F. The purpose of the first connecting rod 52 is to be rotatably connected to the front end of the third connecting rod 103. Together, they form a space between the connection point of the upper backrest part 1 and the backrest bracket 3 and the connection point of the upper backrest part 1 and the transfer rod 5. The purpose of the second connecting rod 53 is to support the lower part of the lower backrest part, and the lower backrest part and the upper backrest part form a moderate and continuous fitting surface for leaning against the back of the human body. The first connecting rod 52 is formed integrally with the main rod 51 and is inclined forward and upward with respect to the main rod 51. The second connecting rod 53 is rotatably connected to the main rod 51, and the rotation range of the second connecting rod 53 and the main rod 51 is 8 to 10 degrees. The second connecting rod 53 is rotatably connected to the main rod 51, and is also rotatably connected to the lower backrest portion 2. The gap between the lower backrest portion 2 and the main rod 51 is more flexible, and no hindrance occurs when the upper backrest portion 1 and the lower backrest portion 2 are opened or closed.

[0033] The transmission device can rotate the transfer rod 5 relative to the backrest bracket 3. There are various options available, but in this embodiment, a simple and original structure is preferred because the bending and wrapping function of the backrest is transferred to the office chair. The transmission device includes a rotating member 6. The rotating member 6 is rotatably installed relative to the backrest bracket 3. The transfer rod 5 is rotatably connected to the rotating member 6. The rotating part 6 is arranged to drive the transfer rod 5 to move relative to the backrest bracket 3 when the rotating part 6 rotates relative to the backrest bracket 3. The details will be described below.

[0034] As shown in Figs. 1 to 9, the transmission device includes a first connecting rod 7, a second connecting rod 8, an intermediate seat 9, a swing rod 10, and a rotating member 6. The intermediate seat 9 is fixedly connected to the backrest bracket 3, and the intermediate seat 9 and the backrest bracket 3 are rotatably connected to the chassis 4. One end of the first connecting rod 7 is rotatably connected to the chassis 4, an upper end of the second connecting rod 8 is rotatably connected to the other end of the first connecting rod 7, and a lower end of the second connecting rod 8 is rotatably connected to the intermediate seat 9. A four-rod interlocking mechanism is formed by the chassis 4, the intermediate seat 9, the first connecting rod 7, and the second connecting rod 8. The chassis 4 is configured as a main support that remains relatively stationary. When the intermediate seat 9 and the first connecting rod 7 rotate relative to the chassis 4, the second connecting rod 8 remains approximately vertical. The swing rod 10 is rotatably connected to the upper end of the second connecting rod 8, the rotating member 6 is rotatably disposed on the intermediate seat 9, the front end of the rotating member 6 is rotatably connected to the swing rod 10, and the rear end of the rotating member 6 is rotatably connected to the transfer rod 5. When the backrest of the chair is tilted backward, the backrest bracket 3 rotates downward and backward relative to the chassis 4, and the intermediate seat 9 fixed to the backrest bracket 3 also rotates synchronously, and the second connecting rod 8 is driven to move downward and forward. The second connecting rod 8 rotates the first connecting rod 7 downward and backward relative to the chassis 4, and drives the swing rod 10 to move forward and downward. The swing rod 10 drives the rotating member 6 to rotate forward relative to the intermediate seat 9. Thereby, the transfer rod 5 is driven to move relative to the intermediate seat 9 and the backrest bracket 3. The movement of each rod of the transmission device is driven by the backward tilt of the backrest bracket 3 when the chair is tilted backward. When the human body lies on its back, the movement of the backrest bracket 3 realizes the interlocking of each connecting rod in the transmission device. The inclination of the chair backrest and the curvature and wrapping of the upper and lower parts of the backrest are simultaneously performed, making the movement smoother and more comfortable to use.

[0035] The four-rod linkage mechanism consisting of the chassis 4, intermediate seat 9, first connecting rod 7, and second connecting rod 8 has its connection points positioned and the distance between them arranged so that the second connecting rod 8 remains nearly vertical during movement, and therefore the second connecting rod 8 plays a role in driving the swing rod 10.

[0036] The shape of the rotating member 6 is a triangle, and its three corners are exactly three rotation connection points. The upper end of the rotating member 6 is rotatably connected to the intermediate sheet 9, the front end of the rotating member 6 is rotatably connected to the rear end of the swing rod 10, and the rear end of the rotating member 6 is rotatably connected to the lower end of the transfer rod 5. The intermediate sheet 9 extends rearward and has a connecting base 91 attached thereto. The connecting base 91 is hollow and forms an accommodation groove 92. The rotating member 6 is disposed in the accommodation groove 92 and rotatably connected to the connecting base 91 via a rotating shaft 93. The connecting base 91 is open in the vertical direction, the rotating member 6 is disposed in the accommodation groove 92 of the connecting base 91, the lower end of the transfer rod 5 is located in the accommodation groove 92 and rotatably connected to the rotating member 6, and the connecting base 91 extends rearward beyond the main body of the intermediate sheet 9, so that the transfer rod 5 has a sufficient movement margin and does not interfere with the intermediate sheet 9.

[0037] The backrest bracket 3 is an L-shaped frame structure including a horizontal frame 31 and a vertical frame 32. The intermediate sheet 9 is inserted into the horizontal frame 31 from bottom to top and connected by bolts. After the intermediate sheet 9 and the backrest bracket 3 are inserted, they form an integrated whole without compromising the integrity and aesthetics. The purpose of molding them separately is to simplify the two structures and reduce the mold opening and manufacturing costs.

[0038] The chassis 4 includes a seat shell 41 and a base 42. The seat shell 41 is fixedly connected to the base 42. The intermediate seat 9 and the backrest bracket 3 are both rotatably connected to the seat shell 41. The first connecting rod 7 is rotatably connected to the base 42. The seat shell 41 is covered by the outside of the base 42, the backrest bracket 3 is connected to the outside of the seat shell 41, and the first connecting rod 7 is connected to the base 42 inside the seat shell 41. Both can be rotatably connected to the chassis 4 without colliding. It is compact in the front-rear direction and can avoid each other in the left-right direction at the same time, and the space arrangement is more reasonable. [Explanation of symbols]

[0039] Upper backrest section 1; Upper backrest frame 101; Upper backrest bracket 102; 3rd connecting rod 103; Lower backrest section 2; Backrest bracket 3; Horizontal frame 31; Vertical frame 32; Chassis 4; Seat shell 41; Base 42; Transfer rod 5; Main rod 51; First connecting rod 52; Second connecting rod 53; Rotating member 6; 1st connecting rod 7; Second connecting rod 8; Middle seat 9; Consolidated basis 91; containment trench 92; Rotation axis 93; Swing Rod 10

Claims

1. 1. A chair including an upper back portion, a lower back portion, a back bracket, and a chassis, the backrest bracket is rotatably mounted on the chassis, the upper backrest portion is rotatably mounted on the backrest bracket, and the lower backrest portion is rotatably connected to the upper backrest portion; A transfer rod and a transmission device are provided between the upper backrest portion and the chassis, and both ends of the transfer rod are rotatably connected to the upper backrest portion and the transmission device, respectively; When the backrest bracket is tilted backward, the transfer rod and the backrest bracket move relative to each other under the action of the transmission device, the upper backrest portion is rotated forward with respect to the backrest bracket by the transfer rod, the lower end of the upper backrest portion moves backward and approaches the backrest bracket, and the angle between the upper backrest portion and the lower backrest portion decreases. A chair for improving comfort.

2. a lower end of the transfer rod is connected to the transmission device, an upper end of the transfer rod is rotatably connected to a lower end of the upper backrest portion, and a rotational connection point between the transfer rod and the upper backrest portion is located forward of a rotational connection point between the backrest bracket and the upper backrest portion; A lower end of the lower backrest portion is rotatably connected to the transfer rod, and an upper end of the lower backrest portion is rotatably connected to a lower end of the upper backrest portion; When the backrest bracket is tilted backward, the lower end of the transfer rod moves forward, the upper end of the transfer rod moves rearward, the lower end of the upper backrest portion and the upper end of the lower backrest portion move rearward and approach the backrest bracket, and the lower end of the lower backrest portion moves forward and away from the backrest bracket.

2. The comfort enhancing chair of claim 1.

3. The transfer rod includes a main rod, a first connecting rod located at an upper end of the main rod, and a second connecting rod located at a 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 to an upper end of the upper backrest portion, and the second connecting rod is connected to a lower end of the lower backrest portion; 3. The comfort enhancing chair of claim 2.

4. The first connecting rod is integrally formed with the main rod, the first connecting rod is inclined forward and upward with respect to the main rod, the second connecting rod is rotatably connected to the main rod, and a rotation range of the second connecting rod and the main rod is 8 to 10 degrees.

4. Comfort enhancing chair according to claim 3.

5. The transmission device includes a rotating member, the rotating member is rotatably mounted relative to the backrest bracket, and the transfer rod is rotatably connected to the rotating member; The rotating member is configured to drive the transfer rod to move relative to the backrest bracket when the rotating member rotates relative to the backrest bracket.

2. The comfort enhancing chair of claim 1.

6. The transmission device further includes a first connecting rod, a second connecting rod, an intermediate seat, and a swing rod; the intermediate seat and the backrest bracket are fixed relative to each other and rotate synchronously with the backrest bracket relative to the chassis; one end of the first connecting rod is rotatably connected to the chassis, an upper end of the second connecting rod is rotatably connected to the other end of the first connecting rod, a lower end of the second connecting rod is rotatably connected to the intermediate seat, the swing rod is rotatably connected to the upper end of the second connecting rod, the rotating member is rotatably disposed on the intermediate seat, a front end of the rotating member is rotatably connected to the swing rod, and a rear end of the rotating member is rotatably connected to the transfer rod, When the backrest bracket tilts backward, the backrest bracket rotates downward and backward relative to the chassis, and the intermediate seat fixed to the backrest bracket also rotates synchronously, and the second connecting rod is driven to move downward and forward, and therefore the second connecting rod drives the first connecting rod to rotate downward and backward relative to the chassis, and at the same time, drives the swing rod to move forward and downward, and further the swing rod drives the rotating member to rotate forward relative to the intermediate seat, thereby driving the transfer rod to move relatively to the intermediate seat and the backrest bracket.

6. Comfort enhancing chair according to claim 5.

7. The intermediate seat extends rearward and is provided with a connection base, the connection base is hollow and has an accommodation groove formed therein, the rotating member is disposed in the accommodation groove and is rotatably connected to the connection base via a rotating shaft. Comfort enhancing chair according to claim 6.

8. 7. The comfort enhancing chair of claim 6, wherein the rotating member is triangular in shape.

9. The backrest bracket is an L-shaped frame structure, and has a horizontal frame and a vertical frame, the horizontal frame is located on both the left and right sides of the rear of the chassis, and a front end of the horizontal frame is rotatably connected to a rear end of the chassis; A support is fixed to both the left and right sides of the upper end of the intermediate position of the horizontal frame, and the support is connected via a connecting beam. When the backrest bracket is rotated by pressing the connecting beam against the upper side of the intermediate seat, the horizontal frame can rotate simultaneously with the intermediate seat pressed against the connecting beam via the connecting beam. Comfort enhancing chair according to claim 6.

10. 7. The comfort enhancing chair of claim 6, wherein the chassis includes a seat shell and a base, the seat shell being fixedly connected to the base, the intermediate seat and the backrest bracket being rotatably connected to the seat shell, and the first connecting rod being rotatably connected to the base.

11. 2. The comfort enhancing chair of claim 1, wherein the lower backrest portion has a frame structure, the upper backrest portion includes an upper backrest portion frame and an upper backrest portion bracket, the upper backrest portion frame is fixedly connected to the upper backrest portion bracket, and a lower end of the upper backrest portion bracket is rotatably connected to an upper end of the backrest portion bracket.

12. 12. The comfort enhancing chair of claim 11, wherein the upper back bracket includes a third connecting rod extending forwardly therefrom, the third connecting rod being fixedly connected to the upper back frame and further rotatably connected to an upper end of the transfer rod.

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