Dynamic chassis

Abstract

The utility model provides a dynamic chassis which comprises a base serving as a main body support, a transverse movement seat arranged on the base through first rotating shafts arranged front and back, and a longitudinal movement seat arranged on the transverse movement seat through second rotating shafts arranged left and right. Gaps are formed between the transverse movement seat and the longitudinal movement seat as well as between the transverse movement seat and the base so as to provide space for swinging; the base is provided with a bottom plate, a longitudinal protruding part and a transverse protruding part which are distributed in different directions are arranged on the bottom plate upwards or downwards in a protruding mode, the longitudinal protruding part is used for providing additional support for left-right swing of the transverse movement seat, and the transverse protruding part is used for providing additional support for front-back swing of the longitudinal movement seat. The strength and the supporting capacity of the dynamic chassis are improved.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a dynamic chassis. Background Art

[0002] As one of the most common pieces of furniture, chairs accompany us for a large amount of time throughout the day, especially in offices where users spend most of their time sitting. However, people are also experiencing more and more comfort and health problems due to prolonged sitting. In terms of comfort, sitting in the same posture for a long time will make people feel more tired, with discomfort in the cervical spine and back, numbness in the buttocks and legs, etc. The discomfort makes it difficult for people to maintain a happy mood and focus on work. In terms of health issues, sitting in the same posture for a long time will cause compression of the lumbar spine and legs, which in turn leads to an increase in the incidence of diseases such as lumbar spondylosis.

[0003] To solve the above problems, manufacturers set up a dynamic chassis to enable the seat to move in multiple directions to accommodate users with more and freer sitting postures; however, the force conditions of the dynamic chassis are more complex than those of the traditional chassis, and it places a greater test on the strength and supporting capacity of the components. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the utility model provides a dynamic chassis, including a base as a main body support, a transverse motion seat arranged on the base through a first rotating shaft arranged front to back, and a longitudinal motion seat arranged on the transverse motion seat through a second rotating shaft arranged left to right. In the up and down directions, there are gaps between the transverse motion seat and the longitudinal motion seat, and between the transverse motion seat and the base to provide space for swinging; the base has a bottom plate, on which longitudinal protrusions and transverse protrusions with different distribution directions are protruded upward or downward, the longitudinal protrusions are used to provide additional support for the left and right swinging of the transverse motion seat, and the transverse protrusions are used to provide additional support for the front and back swinging of the longitudinal motion seat, so as to increase the strength and supporting capacity of the dynamic chassis.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] The cam is connected to the seat frame by a first rotation axis and a second rotation axis arranged along the left and right sides of the seat frame, and the cam is connected to the seat frame by a second rotation axis arranged along the right and left sides of the seat frame.

[0007] The cooperation of the lateral motion seat and the longitudinal motion seat enables the seat to swing in multiple directions. Compared with the traditional chassis, the seat is more flexible, the user can change the sitting posture at will, the comfort is higher, and it has dynamic characteristics; the gap between the lateral motion seat and the longitudinal motion seat and the gap between the lateral motion seat and the base provide space for swinging back and forth and left and right respectively; the setting of the protrusion is used to increase the strength of the base, and the base serves as the main support of the chassis for connecting the gas rod. Increasing its strength can ensure the structural strength and support stability of the chassis; since the chassis has a dynamic swing function, the force conditions in actual use are different from those of the traditional chassis The base is very different from the first base, and the base will therefore be subjected to forces in multiple directions, so the required strength requirement is higher, especially the requirement for forces in different directions: although the lateral motion seat only swings left and right, the seat connected to the longitudinal motion seat can produce movements in more directions when the first and longitudinal motion seats can swing freely. Simply setting up reinforcement ribs cannot meet the requirements, and the longitudinal protrusions and the lateral protrusions are set for the two swinging directions of the swing chassis, which decomposes the force when the seat produces movement in other directions into left and right directions and front and back directions for support, thereby simply and low-costly supporting the complex movement of the swing chassis.

[0008] Preferably, the longitudinal protrusion is perpendicular to the transverse protrusion, and the longitudinal protrusion is arranged in the front-to-back direction, and the transverse protrusion is arranged in the left-to-right direction. The longitudinal protrusion and the transverse protrusion intersect in a cross shape, and the intersection of the longitudinal protrusion and the transverse protrusion coincides with the center position of the bottom plate, and a socket for inserting the gas rod is provided in the center position of the bottom plate. The longitudinal protrusion and the transverse protrusion are arranged in different directions to increase the support strength when swinging in different directions. At the same time, the protrusion is in a cross shape as a whole, with a simple structure, which reduces the difficulty and cost of processing. The socket is located in the center of the bottom plate, that is, in the middle of the protrusion. When the base transmits force to the gas rod and the gas rod gives a reaction force to the base, the protrusion can also play a role in increasing the strength of the base, thereby ensuring the structural strength and service life.

[0009] Preferably, the intersection of the projections of the axes of the first and second rotating shafts on the bottom plate falls within the coverage of the socket, that is, the intersection of the projections of the axes of the first and second rotating shafts is also located in the middle of the protrusion, so as to achieve a more stable and balanced force effect.

[0010] Preferably, the base includes a bottom shell and an axle seat, the bottom shell including the bottom plate, the axle seat being disposed in the bottom shell, one end of the first rotating shaft being disposed on the axle seat and remaining relatively stationary with the axle seat, the other end of the first rotating shaft protruding outward from the bottom shell and rotatably connected to the transverse motion seat; a protrusion protruding downward from the bottom plate, a downwardly recessed positioning groove formed on the upper surface of the bottom plate at the position of the protrusion, a downwardly recessed positioning portion protruding downwardly from the lower end of the axle seat, the positioning portion being disposed in the positioning groove; a spring is also disposed in the positioning groove formed by the transverse protrusion, the spring being vertically disposed between the bottom plate and the transverse motion seat, one end of the spring abutting the bottom plate and the other end abutting the transverse motion seat, the spring being configured to provide swing cushioning and restoring force for the transverse motion seat. The protrusion is formed by stamping the bottom plate downward, which is less expensive than die-cutting; and, at the same time, means that all portions of the bottom of the base, except for the socket and the protrusion, are relatively recessed upward, thereby saving material costs; the positioning groove facilitates the installation and connection of the axle seat and the spring.

[0011] Preferably, the width of the longitudinal protrusion and the transverse protrusion ranges from 30 mm to 40 mm. The widths of the longitudinal protrusion and the transverse protrusion are both relatively wide, and the length and width of the base plate are generally 80 mm to 100 mm. The protrusions occupy a larger proportion of the base plate, and the overall force-bearing area of the protrusions is larger, thereby preventing stress concentration problems and increasing the strength-enhancing effect of the protrusions.

[0012] Preferably, a spring is provided between the lateral motion seat and the base, and there are at least two springs, which are symmetrically distributed on both sides of the first rotating shaft. The spring provides a buffer and a reset force for the movement of the lateral motion seat.

[0013] Preferably, the lower end of the spring abuts the base, and the upper end of the spring abuts the lateral motion seat; an opening is provided at the bottom of the base, the opening being coaxial with the spring, and the spring is positioned within the opening; an upwardly convex stopper is formed around the opening on the base, the stopper protruding upward until it enters the spring. The stopper is formed by stamping, and the opening is located on a protruding portion at the bottom of the base; the opening is provided at the bottom of the base, and a portion of the edge of the opening is stamped upward and enters the spring, providing positioning for the spring during installation and also serving as a stopper to prevent the spring from disengaging during use.

[0014] As an advantage, the lateral motion seat is provided with a back connector, which is configured to connect to the chair back and swing along with the swing of the lateral motion seat. This solution enables the chair back and the seat to swing left and right together.

[0015] Preferably, the front end of the back connector is rotatably connected to the transverse motion seat; the back connector and the longitudinal motion seat are linked via a linkage structure, wherein the linkage structure is configured such that when the back connector rotates on the transverse motion seat, the longitudinal motion seat swings back and forth. The back connector and the longitudinal motion seat are linked, so that when the backrest is reclined, the longitudinal motion seat can also swing back and tilt forward, thereby enhancing overall comfort. The back and forth swinging of the longitudinal motion seat can be directly applied to the seat-back linkage when the backrest is reclined.

[0016] Preferably, the linkage structure includes a sliding rotating member and a sliding rotating groove. A connecting seat extends obliquely downward from the rear of the longitudinal motion seat. The connecting seat is connected to the sliding rotating member. The sliding rotating member is arranged in the left-right direction. The sliding rotating groove is formed on the back connecting member. The sliding rotating member is inserted into the sliding rotating groove. When the back connecting member rotates on the transverse motion seat, the sliding rotating member and the sliding rotating groove move and rotate relative to each other, driving the longitudinal motion seat to swing back and forth. This solution realizes the linkage between the back connecting member and the longitudinal motion seat, and thus realizes the seat-back linkage, and the structure is simpler.

[0017] Preferably, there are two first rotating shafts, one protruding from the front and rear ends of the base, the other coaxial and spaced apart. The first rotating shaft is not a single rotating shaft extending through the base. The gap between the first rotating shaft and the second rotating shaft allows for the gas rod to be avoided. This prevents the chassis from being forced to increase in thickness due to the conflict between the gas rod and the first rotating shaft, resulting in a thinner overall structure and a smaller distance between the seat and the bottom of the chassis. This reduces the minimum seat height and enhances comfort. If the minimum seat height is too high, the front end of the seat may easily hit the thighs when the seat is tilted backward, thereby reducing comfort.

[0018] Preferably, the transverse motion seat comprises a main body and a support seat, the support seat protrudes from the upper surface of the main body, and a gap is provided between the longitudinal motion seat and the main body to allow the longitudinal motion seat to tilt forward and backward.

[0019] Preferably, the main body includes a horizontal supporting portion and a tilt supporting portion, and the support seat includes a first supporting protrusion and a second supporting protrusion. The horizontal supporting portion is arranged horizontally, and the tilt supporting portion is arranged downwardly inclined at the rear end of the horizontal supporting portion. The first supporting protrusion is arranged on the horizontal supporting portion and protrudes from the upper surface of the horizontal supporting portion, and the second supporting protrusion is arranged on the tilt supporting portion and protrudes from the upper surface of the tilt supporting portion. When the longitudinal motion seat is horizontal, it abuts against the first supporting protrusion; when the longitudinal motion seat is tilted backward, it abuts against the second supporting protrusion. The first supporting protrusion is located at the front end of the horizontal supporting portion, supporting and limiting the longitudinal motion seat below it when it is horizontal; the second supporting protrusion is located on the tilted tilt supporting portion and is also in an inclined state. When the longitudinal motion seat is tilted backward to the maximum, the second supporting protrusion supports and limits the longitudinal motion seat below it.

[0020] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0021] The cooperation of the lateral motion seat and the longitudinal motion seat enables the seat to swing in multiple directions. Compared with the traditional chassis, the seat is more flexible, the user can change the sitting posture at will, the comfort is higher, and it has dynamic characteristics; the gap between the lateral motion seat and the longitudinal motion seat and the gap between the lateral motion seat and the base provide space for swinging back and forth and left and right respectively; the setting of the protrusion is used to increase the strength of the base, and the base serves as the main support of the chassis for connecting the gas rod. Increasing its strength can ensure the structural strength and support stability of the chassis; since the chassis has a dynamic swing function, the force conditions in actual use are different from those of the traditional chassis The base is very different from the first base, and the base will therefore be subjected to forces in multiple directions, so the required strength requirement is higher, especially the requirement for forces in different directions: although the lateral motion seat only swings left and right, the seat connected to the longitudinal motion seat can produce movements in more directions when the first and longitudinal motion seats can swing freely. Simply setting up reinforcement ribs cannot meet the requirements, and the longitudinal protrusions and the lateral protrusions are set for the two swinging directions of the swing chassis, which decomposes the force when the seat produces movement in other directions into left and right directions and front and back directions for support, thereby simply and low-costly supporting the complex movement of the swing chassis. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the dynamic chassis in Example 1 of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the dynamic chassis in Example 1 of the present invention. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the base in Example 1 of the present invention. Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the three-dimensional structure of the base in Example 1 of the present invention. Figure 2 ;

[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the lateral motion seat arranged on the base in Example 1 of the present invention;

[0027] Figure 6 This is a side view of the lateral motion seat in Example 1 of the present utility model;

[0028] Figure 7 This is a schematic diagram of a three-dimensional structure in which a gap is provided between the longitudinal motion seat and the transverse motion seat in Example 1 of the present invention;

[0029] Figure 8 This is an exploded view of the dynamic chassis in Example 1 of the present utility model;

[0030] Figure 9 This is a schematic diagram of the three-dimensional structure in which the back connecting member is rotatably arranged on the transverse motion seat in Example 2 of the present utility model. Figure 1 ;

[0031] Figure 10 This is a schematic diagram of the three-dimensional structure in which the back connecting member is rotatably arranged on the transverse motion seat in Example 2 of the present utility model. Figure 2 .

[0032] The figures are marked as follows: base 1; lateral motion seat 2; longitudinal motion seat 3; first rotating shaft 4; second rotating shaft 5; spring 6; back connecting member 24; sliding rotating member 25; sliding rotating groove 26; connecting seat 27; bottom shell 28; bottom plate 281; shaft seat 29; socket 30; longitudinal protrusion 31; lateral protrusion 32; positioning groove 33; positioning portion 34; opening 35; limiting portion 36; main body 37; horizontal supporting portion 371; tilting supporting portion 372; first supporting protrusion 38; second supporting protrusion 39. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is 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 therein can be combined with each other without conflict.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0035] In the description of 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.

[0036] The specific implementation of the utility model is as follows: Example

[0037] like Figure 1-8 As shown, the present invention provides a dynamic chassis, including a base 1, a transverse motion seat 2 and a longitudinal motion seat 3. The base 1 is configured as a gas rod for connecting a seat and serves as the main support of the dynamic chassis; the transverse motion seat 2 is hinged to the base 1 through a first rotating shaft 4 arranged along the front and back, and the longitudinal motion seat 3 is hinged to the transverse motion seat 2 through a second rotating shaft 5 arranged along the left and right. In the up and down directions, there is a gap between the transverse motion seat 2 and the longitudinal motion seat 3, and there is a gap between the left and right ends of the transverse motion seat 2 and the base 1; the transverse motion seat 2 is configured to drive the longitudinal motion seat 3 to swing left and right on the base 1, and the longitudinal motion seat 3 is configured to connect the chair seat and swing back and forth on the transverse motion seat 2; the base 1 has a bottom plate 281 at the bottom, and a protrusion is protruded upward or downward on the bottom plate 281. The protrusion includes a longitudinal protrusion 31 and a transverse protrusion 32 extending in different directions. The longitudinal protrusion 31 is configured to provide support when the transverse motion seat 2 swings left and right, and the transverse protrusion 32 is configured to provide support when the longitudinal motion seat 3 swings back and forth.

[0038] The cooperation of the lateral motion seat 2 and the longitudinal motion seat 3 enables the seat to swing in multiple directions. Compared with the traditional chassis, the seat is more flexible and the user can change the sitting posture at will, which is more comfortable and dynamic. The gap between the lateral motion seat 2 and the longitudinal motion seat 3 and the gap between the lateral motion seat 2 and the base 1 provide space for swinging back and forth and left and right respectively. The setting of the protrusion is used to increase the strength of the base 1. The base 1 serves as the main support of the chassis for connecting the gas rod. Increasing its strength can ensure the structural strength and support stability of the chassis. Since the chassis has a dynamic swing function, the force conditions in actual use are different from those of the transmission The base 1 is very different from the traditional chassis, and the base 1 will therefore be subjected to forces in multiple directions, so the required strength requirements are higher, especially the requirements for forces in different directions: although the lateral motion seat 2 only swings left and right, the seat connected to the longitudinal motion seat 3 can produce movements in more directions when the first and longitudinal motion seats can swing freely. Simply setting up ribs for reinforcement cannot meet the requirements, and the longitudinal protrusions and the lateral protrusions are set for the two swinging directions of the swinging chassis, which decomposes the force when the seat produces movement in other directions into left and right directions and front and back directions for support, thereby simply and low-costly supporting the complex movements of the dynamic chassis.

[0039] Specifically, the base 1 includes a bottom shell 28 and an axle seat 29. The bottom shell 28 is a shell with an open top. The bottom shell 28 includes a bottom plate 281. The axle seat 29 is fixedly arranged in the bottom shell 28 and is located above the bottom plate 281. The axle seat 29 and the bottom shell 28 can be fixed by welding; one end of the first rotating shaft 4 is arranged on the axle seat 29 and remains relatively stationary with the axle seat 29, and the other end of the first rotating shaft 4 protrudes outward from the bottom shell 28 and is rotatably connected to the transverse motion seat 2; the first rotating shaft 4 and the axle seat 29 are formed by milling the end of the first rotating shaft 4 to form a special-shaped cross-section and opening a special-shaped hole on the axle seat 29 to achieve the rotation limit of the two; the first rotating shaft 4 has two, two first rotating shafts. A rotating shaft 4 is respectively protruded from the front and rear ends of the base 1. The two first rotating shafts 4 are coaxial and spaced apart. At the space, a socket 30 for inserting a gas rod is opened on the base 1, which is specifically opened from the bottom plate 281 to the through-shaft seat 29; the first rotating shaft 4 is not a single rotating shaft passing through the base 1. The gap between the two avoids the gas rod by itself, and the chassis will not be forced to increase in thickness due to the conflict between the gas rod and the position of the first rotating shaft 4, making the overall body thinner, and the distance between the seat surface and the bottom surface of the chassis is smaller, thereby reducing the minimum height of the seat surface and increasing comfort. If the minimum height of the seat surface is too high, the front end of the seat will easily hit the thigh when the seat tilts backward, thereby reducing comfort.

[0040] like Figure 2-4 As shown, the bottom of the base 1 is provided with a protrusion that protrudes upward or downward, which is specifically arranged on the bottom plate 281 of the bottom shell 28. In this embodiment, the protrusion protrudes downward on the bottom plate 281. Specifically, the protrusion includes a longitudinal protrusion 31 and a transverse protrusion 32. The longitudinal protrusion 31 is configured to provide support when the transverse motion seat 2 swings left and right, and the transverse protrusion 32 is configured to provide support when the longitudinal motion seat 3 swings back and forth; the setting of the protrusion is used to increase the strength of the base 1. The base 1 serves as the main support of the chassis for connecting the gas rod. Increasing its strength can ensure the structural strength and support stability of the chassis; since the chassis has a swing function, the force applied during actual use The situation is very different from that of a traditional chassis, and the base 1 will therefore be subjected to forces in multiple directions, so the required strength requirement is higher, especially the requirement for forces in different directions: although the lateral motion seat 2 only swings left and right, the seat connected to the longitudinal motion seat 3 can produce movements in more directions when the first and longitudinal motion seats 3 can swing freely. Simply setting up ribs for reinforcement cannot meet the requirements, and the longitudinal protrusions 31 and the lateral protrusions 32 are set for the two swinging directions of the swinging chassis, which decomposes the force when the seat produces movement in other directions into left and right and front and back forces for support, thereby supporting the complex movements of the dynamic chassis simply and at low cost.

[0041] The longitudinal protrusion 31 is arranged along the front-to-back direction, and the transverse protrusion 32 is arranged along the left-to-right direction. The longitudinal protrusion 31 and the transverse protrusion 32 intersect in a cross shape. The intersection of the longitudinal protrusion 31 and the transverse protrusion 32 coincides with the center position of the bottom plate 281, and the said socket 30 is opened at the center position of the bottom plate 281; the intersection point of the axis of the first rotating shaft 4 and the axis of the second rotating shaft 5 projected on the bottom plate 281 falls within the coverage range of the socket 30, that is, the intersection point of the projection of the axis of the first and second rotating shafts 4 and 5 is also located in the middle position of the protrusion, so as to achieve a more stable and balanced force effect.

[0042] The longitudinal protrusion 31 and the transverse protrusion 32 are extended in different directions to increase the support strength when swinging in different directions. At the same time, the protrusion is cross-shaped as a whole, with a simple structure, which reduces the difficulty and cost of processing; the socket 30 is located in the center of the bottom plate 281, that is, in the middle of the protrusion. When the base 1 transmits force to the gas rod and the gas rod gives a reaction force to the base 1, the protrusion can also increase the strength of the base 1, thereby ensuring the structural strength and service life.

[0043] Furthermore, the protrusion protrudes downward from the bottom plate 281, and a downwardly concave positioning groove 33 is formed on the upper surface of the bottom plate 281 at the position of the protrusion, and the positioning groove 33 is also cross-shaped; four positioning parts 34 are protruding downward from the lower end of the shaft seat 29, and the four positioning parts 34 are respectively arranged in the positioning grooves 33 in four directions; only a single spring 6 is provided on one side of the first rotating shaft 4, and the two springs 6 are symmetrically distributed. The spring 6 is vertically arranged in the positioning groove 33 formed by the horizontal protrusion 32, one end of the spring 6 abuts against the bottom plate 281, and the other end abuts against the horizontal motion seat 2. The spring 6 is configured to provide swing buffering and reset force for the horizontal motion seat 2; the bottom plate 281 is stamped downward to form the said protrusion, which is lower in cost than opening a mold; at the same time, it means that the other parts of the bottom of the base 1 except the socket 30 and the protrusion are relatively concave upward, thereby saving material costs; under the action of the positioning groove 33, the installation and connection of the shaft seat 29 and the spring 6 are more convenient.

[0044] The width range of the longitudinal protrusion 31 and the transverse protrusion 32 is 30mm-40mm; the width of the longitudinal protrusion 31 and the transverse protrusion 32 are both relatively wide, and the length and width of the bottom plate 281 are generally 80mm-100mm. The protrusion occupies a large proportion on the bottom plate 281, and the overall force-bearing area of the protrusion is larger, which prevents the problem of stress concentration and increases the effect of the protrusion in improving strength; in this embodiment, the width of the longitudinal protrusion 31 is 32mm, the width of the longitudinal protrusion 31 is 37mm, the length of the bottom plate 281 in the front-to-back direction is 85mm, and the length of the bottom plate 281 in the left-to-right direction is 98mm.

[0045] Furthermore, the lower end of the spring 6 abuts against the base 1, and the upper end of the spring 6 abuts against the lateral motion seat 2; an opening 35 is provided at the bottom of the base 1, and the opening 35 is coaxial with the spring 6. The spring 6 is arranged at the opening 35 and is located above the opening 35, and an anti-slip rod (not shown) can be inserted into the spring 6 from the opening 35 to prevent the upper and lower ends of the spring 6 from being disengaged from the abutment; the base 1 is formed with an upwardly convex limiting portion 36 around the opening 35, and the limiting portion 36 protrudes upward to enter the spring 6; the limiting portion 36 is stamped out at the same time as the opening 35, and the opening 35 is located on the protruding portion at the bottom of the base 1; an opening 35 is provided at the bottom of the base 1, and a portion of the edge of the opening 35 is stamped upward and enters the spring 6, giving the spring 6 a positioning when it is installed, and can also serve as a limit when in use to prevent the spring 6 from being disengaged.

[0046] In addition, if Figure 5-7 As shown, the lateral motion seat 2 includes a main body 37 and a support seat, the support seat protrudes from the upper surface of the main body 37, and there is a gap between the longitudinal motion seat 3 and the main body 37 to avoid the longitudinal motion seat 3 from tilting forward and backward. Specifically, the main body 37 includes a horizontal supporting portion 371 and a tilting supporting portion 372, and the support seat includes a first supporting protrusion 38 and a second supporting protrusion 39. The horizontal supporting portion 371 is horizontally arranged, and the tilting supporting portion 372 is tilted downward and arranged at the rear end of the horizontal supporting portion 371. The first supporting protrusion 38 is arranged on the horizontal supporting portion 371 and protrudes from the horizontal supporting portion 37. 1, the second supporting protrusion 39 is arranged on the upper surface of the tilting supporting portion 372 and protrudes from the upper surface of the tilting supporting portion 372; when the longitudinal motion seat 3 is horizontal, it abuts against the first supporting protrusion 38; when the longitudinal motion seat 3 tilts backward, it abuts against the second supporting protrusion 39; the first supporting protrusion 38 is located at the front end of the horizontal supporting portion 371, and supports and limits the longitudinal motion seat 3 below it when it is horizontal; the second supporting upper protrusion 39 is located on the inclined tilting supporting portion 372 and is also in an inclined state. When the longitudinal motion seat 3 tilts backward to the maximum, the second supporting protrusion 39 supports and limits the longitudinal motion seat 3 below it.

[0047] The dynamic chassis device retains the front and rear tilting while increasing the left and right tilting effect, and has low cost: only a swing seat and corresponding internal parts are added to the original basic chassis, without making major changes to other components of the chassis, and there is no need to add extension parts on the left and right sides to install the spring 6. The same effect can be achieved with smaller changes, and the mold opening cost and material cost are reduced.

[0048] Example 2: The difference between this example and Example 1 is that a back connector 24 is provided to realize seat-back linkage; specifically:

[0049] like Figure 9 、 10As shown, this solution enables the chair back and seat to swing left and right together: a back connector 24 is provided on the lateral motion seat 2, and the back connector 24 is configured to connect the chair back and swing with the swing of the lateral motion seat 2; the front end of the back connector 24 is rotatably connected to the lateral motion seat 2; the back connector 24 and the longitudinal motion seat 3 are linked by a linkage structure, and the linkage structure is configured to drive the longitudinal motion seat 3 to swing back and forth when the back connector 24 rotates on the lateral motion seat 2; the back connector 24 is linked with the longitudinal motion seat 3, and when the chair back is reclined, the longitudinal motion seat 3 can also swing backward and tilt up at the front, which makes the overall comfort stronger; the back and forth swinging of the longitudinal motion seat 3 can be directly applied to the seat-back linkage when the chair back is reclined.

[0050] Furthermore, the linkage structure includes a sliding rotating member 25 and a sliding rotating groove 26. A connecting seat 27 extends obliquely downward from the rear of the longitudinal motion seat 3. The connecting seat 27 is connected to the sliding rotating member 25. The sliding rotating member 25 is arranged in the left and right directions. The sliding rotating groove 26 is opened on the back connecting member 24. The sliding rotating member 25 is inserted into the sliding rotating groove 26. When the back connecting member 24 rotates on the transverse motion seat 2, the sliding rotating member 25 and the sliding rotating groove 26 move and rotate relative to each other, driving the longitudinal motion seat 3 to swing back and forth; this scheme is used to achieve the linkage between the back connecting member 24 and the longitudinal motion seat 3, thereby achieving the seat back linkage, and the structure is simpler.

Claims

1. A dynamic chassis, characterized by: The cam is hinged to the base via a first pivot axis arranged along the front and rear, and the longitudinal pivot axis is hinged to the base via a second pivot axis arranged along the left and right. In the up and down directions, there is a gap between the lateral motion seat and the longitudinal motion seat, and there is a gap between the left and right ends of the lateral motion seat and the base. The lateral motion seat is configured to drive the longitudinal motion seat to swing left and right on the base, and the longitudinal motion seat is configured to connect the seat and swing back and forth on the lateral motion seat. The base has a bottom plate at the bottom, and a protrusion is provided on the bottom plate protruding upward or downward. The protrusion includes a longitudinal protrusion and a transverse protrusion extending in different directions. The longitudinal protrusion is configured to provide support when the lateral motion seat swings left and right, and the transverse protrusion is configured to provide support when the longitudinal motion seat swings back and forth.

2. The dynamic chassis according to claim 1, characterized in that: The longitudinal protrusion is perpendicular to the transverse protrusion, and the longitudinal protrusion is arranged in the front-to-back direction, and the transverse protrusion is arranged in the left-to-right direction. The longitudinal protrusion and the transverse protrusion intersect in a cross shape. The intersection of the longitudinal protrusion and the transverse protrusion coincides with the center position of the base plate, and a socket for inserting the gas rod is opened at the center position of the base plate.

3. The dynamic chassis according to claim 1, characterized in that: An intersection point of the projections of the axes of the first rotating shaft and the second rotating shaft on the bottom plate falls within the coverage range of the insertion hole.

4. The dynamic chassis according to claim 2, characterized in that: The base includes a bottom shell and an axle seat. The bottom shell includes the bottom plate. The axle seat is arranged in the bottom shell. One end of the first rotating shaft is arranged on the axle seat and remains relatively stationary with the axle seat. The other end of the first rotating shaft protrudes outward from the bottom shell and is rotatably connected to the transverse motion seat. The protrusion protrudes downward from the bottom plate. A downwardly concave positioning groove is formed on the upper surface of the bottom plate at the position of the protrusion. A positioning portion protrudes downward at the lower end of the axle seat, and the positioning portion is arranged in the positioning groove. A spring is also provided in the positioning groove formed by the transverse protrusion. The spring is vertically arranged between the bottom plate and the transverse motion seat. One end of the spring abuts against the bottom plate, and the other end abuts against the transverse motion seat. The spring is configured to provide swing buffering and reset force for the transverse motion seat.

5. The dynamic chassis according to claim 1, characterized in that: The width of the longitudinal protrusion and the transverse protrusion ranges from 30 mm to 40 mm.

6. The dynamic chassis according to claim 1, characterized in that: Springs are arranged between the transverse motion seat and the base. There are at least two springs, and the springs are symmetrically distributed on both sides of the first rotating shaft.

7. The dynamic chassis according to claim 6, characterized in that: The lower end of the spring abuts against the base, and the upper end of the spring abuts against the lateral motion seat; an opening is provided at the bottom of the base, the opening is coaxial with the spring, and the spring is arranged at the opening; an upwardly convex limiting portion is formed around the opening on the base, and the limiting portion protrudes upward until it enters the spring.

8. The dynamic chassis according to claim 1, characterized in that: A back connecting piece is provided on the transverse motion seat. The back connecting piece is configured to be connected to the chair back and swing along with the swing of the transverse motion seat.

9. The dynamic chassis according to claim 8, characterized in that: The front end of the back connector is rotatably connected to the transverse motion seat; the back connector and the longitudinal motion seat are linked through a linkage structure, and the linkage structure is configured so that when the back connector rotates on the transverse motion seat, the longitudinal motion seat is driven to swing back and forth.

10. The dynamic chassis according to claim 9, characterized in that: The linkage structure includes a sliding rotating member and a sliding rotating groove. A connecting seat extends obliquely downward from the rear of the longitudinal motion seat. The connecting seat is connected to the sliding rotating member. The sliding rotating member is arranged in the left and right directions. The sliding rotating groove is opened on the back connecting member. The sliding rotating member is inserted into the sliding rotating groove. When the back connecting member rotates on the transverse motion seat, the sliding rotating member and the sliding rotating groove move and rotate relative to each other, driving the longitudinal motion seat to swing back and forth.

11. The dynamic chassis according to claim 1, characterized in that: There are two first rotating shafts, which are respectively protruded on the front and rear ends of the base. The two first rotating shafts are coaxial and spaced apart.

12. The dynamic chassis according to claim 1, characterized in that: The transverse motion seat comprises a main body and a support seat, the support seat protrudes from the upper surface of the main body, and a gap is provided between the longitudinal motion seat and the main body.

13. The dynamic chassis according to claim 12, characterized in that: The main body includes a horizontal supporting portion and a tilt supporting portion, and the support seat includes a first supporting protrusion and a second supporting protrusion. The horizontal supporting portion is arranged horizontally, and the tilt supporting portion is arranged at the rear end of the horizontal supporting portion and tilted downward. The first supporting protrusion is arranged on the horizontal supporting portion and protrudes from the upper surface of the horizontal supporting portion, and the second supporting protrusion is arranged on the tilt supporting portion and protrudes from the upper surface of the tilt supporting portion; when the longitudinal motion seat is horizontal, it abuts against the first supporting protrusion; when the longitudinal motion seat tilts backward, it abuts against the second supporting protrusion.

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