Swing seat base device

Abstract

The present invention provides a swing seat base device, comprising a base, a first swing seat, and a second swing seat; the first swing seat is hinged to the base by means of a first rotating shaft; the second swing seat is hinged to the first swing seat by means of a second rotating shaft; the second swing seat can swing in a forward-backward direction; the first swing seat can drive the second swing seat to swing in a left-right direction together; elastic buffer members for providing cushioning and restoring force are arranged between the first swing seat and the base; the base is adapted to be connected to a chair leg gas lift; under the action of the first swing seat, the first swing seat can swing in the left-right direction on the base, and the second swing seat can swing in the forward-backward direction on the first swing seat and can swing in the left-right direction together with the first swing seat under the driving of the first swing seat, so that a seat connected to the second swing seat can swing in both forward-backward and left-right directions.

Description

A swing chassis device Technical Field

[0001] The present invention relates to the field of furniture, in particular to a swing chassis device. 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] People have found that standing up after sitting for a long time can relieve fatigue, and changing sitting posture while sitting can also effectively eliminate fatigue and reduce the harm caused by sitting for a long time. Therefore, how to achieve greater flexibility in changing sitting posture and greater comfort when changing is the key to solving the above problems and achieving more comfortable and healthy sitting. Technical issues

[0004] In order to solve the above technical problems, the present invention provides a swing chassis device, including a base, a first swing seat and a second swing seat, the first swing seat being hinged on the base through a first rotating shaft, and the second swing seat being hinged on the first swing seat through a second rotating shaft, the second swing seat being able to swing back and forth, and the first swing seat being able to drive the second swing seat to swing left and right together, and an elastic buffering member providing buffering and reset force is provided between the first swing seat and the base; the base is used to connect the chair leg gas rod, and under the action of the first swing seat, the first swing seat can swing left and right on the base, and the second swing seat can swing back and forth on the first swing seat and can swing left and right together with the first swing seat under the drive of the first swing seat, so that the chair seat connected to the second swing seat can swing back and forth, left and right, thereby making the swinging flexibility higher, more flexible when changing sitting postures, adapting to more sitting postures, more free and more comfortable for users, and the elastic buffering member also further improves the comfort during swinging. Technical Solutions

[0005] A swing chassis device includes a base, a first swing seat and a second swing seat, the first swing seat is hinged on the base through a first rotating shaft arranged along the front and back, and the second swing seat is hinged on the first swing seat through a second rotating shaft arranged along the left and right, the first swing seat is configured to drive the second swing seat to swing left and right on the base, and the second swing seat is configured to connect to the seat and swing back and forth on the first swing seat; an elastic buffer is provided between the first swing seat and the base, and the elastic buffer is configured to provide swing buffering and reset force for the first swing seat. Beneficial effects

[0006] The base is used to connect the chair leg gas rod. Under the action of the first swing seat, the first swing seat can swing left and right on the base, and the second swing seat can swing back and forth on the first swing seat and can swing left and right together with the first swing seat under the drive of the first swing seat, so that the seat connected to the second swing seat can swing back and forth, left and right, thereby making the swinging more flexible, more flexible when changing sitting postures, adapting to more sitting postures, and allowing users to be more free and comfortable. The elastic buffer also improves the comfort during swinging.

[0007] The overall floating swing chassis (such as when springs are set at the four corners of the chassis) has poor dynamic capabilities; when there is a fixed main beam between the two components, and the components on both sides of the main beam can rotate relative to each other, and springs are set at the position between the two components, the flexibility will be better and the swing amplitude will also increase; taking the left and right swing function as an example, in the swing chassis device, the first rotating shaft is used as the main beam between the base and the first swing seat, and elastic buffers are set on both sides of the first rotating shaft. The first swing seat rotates relative to the base through the first rotating shaft, that is, the first swing seats on both sides of the first rotating shaft can swing relative to the base. Such a setting can be more flexible, the swing feeling is more obvious, and it can better meet the user's needs for switching sitting positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG1 is a schematic diagram of the three-dimensional structure of the swing chassis device in Example 1 of the present invention;

[0009] FIG2 is a second schematic diagram of the three-dimensional structure of the swing chassis device in Example 1 of the present invention;

[0010] FIG3 is an exploded view of the swing chassis device in Example 1 of the present invention;

[0011] FIG4 is a schematic diagram of the three-dimensional structure inside the base in Example 1 of the present invention;

[0012] FIG5 is a top view of the interior of the base in Example 1 of the present invention;

[0013] FIG6 is an exploded view of the swing chassis device in Example 2 of the present invention;

[0014] FIG7 is an exploded view of the swing chassis device in Example 3 of the present invention;

[0015] FIG8 is a top view of the interior of the base in Example 3 of the present invention;

[0016] FIG9 is a schematic diagram of the three-dimensional structure of the swing chassis device in Example 4 of the present invention;

[0017] FIG10 is an exploded view of the swing chassis device in Example 4 of the present invention;

[0018] FIG11 is a schematic diagram of the three-dimensional structure of the gear seat in Example 4 of the present invention;

[0019] FIG12 is a schematic diagram of a three-dimensional structure in which the back connecting member is rotatably disposed on the first swing seat in Example 5 of the present invention;

[0020] FIG13 is a second schematic diagram of the three-dimensional structure in which the back connecting member is rotatably disposed on the first swing seat in Example 5 of the present invention;

[0021] FIG14 is a first perspective structural diagram of the swing chassis device in Example 6 of the present invention;

[0022] FIG15 is a second schematic diagram of the three-dimensional structure of the swing chassis device in Example 6 of the present invention;

[0023] FIG16 is a first schematic diagram of the three-dimensional structure of the base in Example 6 of the present invention;

[0024] FIG17 is a second schematic diagram of the three-dimensional structure of the base in Example 6 of the present invention;

[0025] FIG18 is a schematic diagram of a three-dimensional structure in which the first swing seat is arranged on the base in Example 6 of the present invention;

[0026] FIG19 is a side view of the first swing seat in Example 6 of the present invention;

[0027] FIG20 is a schematic diagram of a three-dimensional structure in which a gap is provided between the second swing seat and the first swing seat in Example 6 of the present invention.

[0028] The reference numerals are: base 1; first swing seat 2; second swing seat 3; first rotating shaft 4; second rotating shaft 5; spring 6; first mounting hole 7; first locking hole 8; first locking member 9; operating lever 10; push-pull torsion spring 11; bent portion 12; protrusion 13; end plate 14; rotating groove 15; second locking hole 16; second locking member 18; second mounting hole 19; buffer return torsion spring 20; gear seat 21; gear member 22; gear groove 23 ; First gear position 231; Second gear position 232; Back connecting member 24; Sliding rotating member 25; Sliding rotating groove 26; Connecting seat 27; Bottom shell 28; Bottom plate 281; Axle seat 29; Insert hole 30; Longitudinal protrusion 31; Transverse protrusion 32; Positioning groove 33; Positioning portion 34; Opening 35; Limiting portion 36; Main body 37; Horizontal supporting portion 371; Tilt supporting portion 372; First supporting protrusion 38; Second supporting protrusion 39. Modes for Carrying Out the Invention

[0029] In order to more clearly understand the above-mentioned objects, 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, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0030] 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.

[0031] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] The specific implementation of the present invention is as follows: Example

[0033] As shown in Figures 1-3, the present invention provides a swing chassis device, including a base 1, a first swing seat 2 and a second swing seat 3. The first swing seat 2 is hinged to the base 1 through a first rotating shaft 4 arranged along the front and back, and the second swing seat 3 is hinged to the first swing seat 2 through a second rotating shaft 5 arranged along the left and right. The first swing seat 2 is configured to drive the second swing seat 3 to swing left and right on the base 1, and the second swing seat 3 is configured to connect to the seat and swing back and forth on the first swing seat 2; an elastic buffer is provided between the first swing seat 2 and the base 1, and the elastic buffer is configured to provide swing buffering and reset force for the first swing seat 2.

[0034] The base 1 is used to connect the chair leg gas rod. Under the action of the first swing seat 2, the first swing seat 2 can swing left and right on the base 1, and the second swing seat 3 can swing back and forth on the first swing seat 2 and can swing left and right together with the first swing seat 2 under the drive of the first swing seat 2, so that the seat connected to the second swing seat 3 can swing back and forth, left and right, thereby making the swinging more flexible, more flexible when changing sitting postures, adapting to more sitting postures, and allowing users to be more free and comfortable. The elastic buffer also improves the comfort during swinging.

[0035] Specifically, as shown in Figures 3-5, there are two first rotating shafts 4, which respectively hinge the front of the base 1 with the front of the first swing seat 2, and hinge the rear of the base 1 with the rear of the first swing seat 2; the elastic buffer is a spring 6, and there are four springs 6. The springs 6 are vertically arranged and symmetrically distributed on both sides of the first rotating shaft 4, that is, there are two springs 6 on each side, and the springs 6 on both sides are symmetrically distributed to maintain force balance.

[0036] A first mounting hole 7 is provided on the first swinging seat 2 or one of the bases 1, and a first locking hole 8 is provided on the other of the first swinging seat 2 or the base 1; in this embodiment, two first mounting holes 7 are provided on the base 1, and one first locking hole 8 is provided on the first swinging seat 2, the two first mounting holes 7 are coaxial and distributed in the left and right directions, and a first locking member 9 arranged in the left and right directions is inserted into the first mounting hole 7, the first locking member 9 is selectively slidably set on the base 1, and selectively enters or leaves the first locking hole 8; the first locking member 9 is configured to selectively enter the first locking hole 8 to lock the first swinging seat 2 and the base 1 or selectively leave the first locking hole 8 to unlock the first swinging seat 2 and the base 1.

[0037] The movement of the first locking member 9 is controlled by an operating rod 10, and the operating rod 10 is inserted into the base 1 in the left and right directions. The operating rod 10 and the first locking member 9 are connected by a push-pull torsion spring 11. When the operating rod 10 slides left and right on the base 1, it drives the push-pull torsion spring 11 to move, thereby driving the first locking member 9 to move; further, one of the torsion spring arms of the push-pull torsion spring 11 is fixed to the operating rod 10, and the other torsion spring arm of the push-pull torsion spring 11 is set on the first locking member 9. The push-pull torsion spring 11 is located inside the base 1 and the first swing seat 2. The push-pull torsion spring 11 has a bent portion 12, which is bent downward and abuts against the base 1. A convex portion 13 is provided on the base 1, and the convex portion 13 is set On the movement path of the push-pull torsion spring 11, when the operating rod 10 drives the push-pull torsion spring 11 and then drives the first locking piece 9 to slide, the push-pull torsion spring 11 abutting against the base 1 will pass through the convex portion 13. When the push-pull torsion spring 11 moves toward the first locking hole 8 and passes through the convex portion 13, the first locking piece 9 enters the locking hole. The cooperation between the push-pull torsion spring 11 and the convex portion 13 will give the user a tactile feedback of locking the first swing seat 2 and the base 1. Conversely, feedback can also be received when unlocking. In this way, the elasticity of the push-pull torsion spring 11 is combined with the convex portion 13 to enable the unlocking and locking operations to be completed in one step. Secondly, the completion of unlocking and locking can be fed back to the user, so that the user can clearly understand the status of the chassis device at this time.

[0038] In the above scheme, the pull-out operating lever 10 is easy for the user to operate to drive the first locking piece 9 to slide; the first locking piece 9 is slidably arranged on the first swinging seat 2 and the base 1, and the first locking piece 9 is inserted in the first mounting hole 7 and slides with the first mounting hole 7, and when the first locking piece 9 slides toward the first locking hole 8 and enters the first locking hole 8, it can lock the first swinging seat 2 and the base 1, so that the first swinging seat 2 cannot move on the base 1. Similarly, when the first locking piece 9 leaves the first locking hole 8, the first swinging seat 2 and the base 1 are unlocked, and the first swinging seat 2 can move on the base 1.

[0039] The second swing seat 3 includes two end plates 14 located on the left and right sides, the two ends of which protrude downward and are located on both sides of the first swing seat 2. The second swing seat 3, the first swing seat 2 and the base 1 are distributed in sequence from top to bottom; the second rotating shaft 5 is arranged in the middle of the end plate 14 and passes through the first swing seat 2 and the two end plates 14, one of the end plates 14 is provided with a rotating groove 15 on the side of the second rotating shaft 5, and the other end plate 14 is provided with a second locking hole 16; the first swing seat 2 and the second swing seat 3 are unlocked or locked by a second locking member 18 for relative rotation between the second swing seat 3 and the first swing seat 2, A second mounting hole 19 is formed on a swing seat 2, and a second locking member 18 is inserted into the rotation groove 15 and the second mounting hole 19. The second locking member 18 is selectively slidably arranged on the first swing seat 2 and the second swing seat 3 along the left and right directions. The second locking member 18 is configured to selectively enter the second locking hole 16 to lock the first swing seat 2 and the second swing seat 3 or selectively leave the second locking hole 16 to unlock the second swing seat 3 and the first swing seat 2; when the second locking member 18 leaves the second locking hole 16 and the second swing seat 3 rotates relative to the first swing seat 2, the second locking member 18 moves in the rotation groove 15.

[0040] In the up-down direction, there is a gap between the left and right ends of the first swing seat 2 and the base 1 , and the gap is for the first swing seat 2 to avoid when swinging left and right on the base 1 .

[0041] Example 2: The difference between this example and Example 1 is only the number of springs 6. Specifically:

[0042] As shown in FIG. 6 and FIG. 7 , in this embodiment, there are two springs 6 , which are vertically and symmetrically distributed on both sides of the first rotating shaft 4 .

[0043] Example 3: This example differs from Example 1 only in the elastic buffer and its arrangement. Specifically:

[0044] As shown in Figure 8, the elastic buffer member is a buffer return torsion spring 20, which is sleeved on the first rotating shaft 4; the number of the buffer return torsion springs 20 is at least an even number. In this embodiment, considering the cost, two buffer return torsion springs 20 are selected, and the two buffer return torsion springs 20 are respectively sleeved on the two first rotating shafts 4. The two torsion spring arms of the buffer return torsion spring 20 act on the base 1 and the first swing seat 2 respectively, and the two torsion spring arms of the two buffer return torsion springs 20 face opposite directions to maintain the force balance on the left and right sides of the first rotating shaft 4.

[0045] When more buffer return torsion springs 20 are selected, in order to maintain the force balance on the left and right sides of the first rotating shaft 4, the number of torsion spring arms on both sides of the first rotating shaft 4 is the same, that is, the number of buffer return torsion springs 20 with the torsion spring arms facing the left and the number of buffer return torsion springs 20 with the torsion spring arms facing the right are the same.

[0046] Example 4: This example differs from Example 1 in that the locking and unlocking operation modes of the first swing seat 2 and the base 1 are different; specifically:

[0047] As shown in Figures 9-11, this scheme drives the movement of the first locking member 9 through a rotating operating lever 10 to achieve locking and unlocking of the first swing seat 2. An operating lever 10 is provided on the first swing seat 2, and the operating lever 10 is selectively rotated; the operating lever 10 is arranged along the left and right directions, and the first locking member 9 is arranged along the front and back directions. The operating lever 10 is connected to the first locking member 9, and the operating lever 10 is configured so that the operating lever 10 rotates to drive the first locking member 9 to leave or enter the first locking hole 8; there are two first locking members 9, and the two first locking members 9 are symmetrically arranged on both sides of the first rotating shaft 4; since the first locking member 9 in this scheme is set to slide back and forth, when the left and right sides of the first swing seat 2 and the base 1 are both acted upon by the first locking member 9, they can maintain balance and stability when locked.

[0048] The operating rod 10 is provided with a push-pull torsion spring 11, one of the torsion spring arms of the push-pull torsion spring 11 is fixed to the operating rod 10, and the other torsion spring arm of the push-pull torsion spring 11 is provided on the first locking member 9. The push-pull torsion spring 11 is configured so that the operating rod 10 drives the first locking member 9 to move through the push-pull torsion spring 11; the push-pull torsion spring 11 can turn the rotation of the operating rod 10 into a sliding driving force for the first locking member 9; further, a gear seat 21 is provided on the first swing seat 2, and a gear member 22 that rotates synchronously is provided on the operating rod 10, and a gear seat 21 is provided The gear slot 23 has a first gear position 231 and a second gear position 232. A convex portion 13 is provided between the first gear position 231 and the second gear position 232. The convex portion 13 protrudes toward the inside of the gear slot 23. The gear member 22 switches between the first gear position 231 and the second gear position 232 over the convex portion 13. The convex portion 13 gives inertia during gear switching to increase the operating feel. The user can feel the completion of the gear switching and leave the gear member 22 in the current gear position after completing the gear switching.

[0049] Example 5: This example differs from Example 4 in that a back connector 24 is provided to achieve seat-back linkage; specifically:

[0050] As shown in Figures 12 and 13, this solution enables the chair back and seat to swing left and right together: a back connector 24 is provided on the first swinging seat 2, and the back connector 24 is configured to connect the chair back and swing with the swing of the first swinging seat 2; the front end of the back connector 24 is rotatably connected to the first swinging seat 2; the back connector 24 and the second swinging seat 3 are linked by a linkage structure, and the linkage structure is configured to drive the second swinging seat 3 to swing back and forth when the back connector 24 rotates on the first swinging seat 2; the back connector 24 is linked with the second swinging seat 3, and when the chair back is reclined, the second swinging 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 second swinging seat 3 can be directly applied to the seat-back linkage when the chair back is reclined.

[0051] 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 second swing 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 first swing seat 2, the sliding rotating member 25 and the sliding rotating groove 26 move and rotate relative to each other, driving the second swing seat 3 to swing back and forth; this scheme is used to achieve the linkage between the back connecting member 24 and the second swing seat 3, thereby achieving the seat-back linkage, and the structure is simpler.

[0052] Example 6: This example differs from Example 2 only in that the locking structure for the left and right swinging directions is removed, that is, the first locking hole 8, the first locking member 9, the operating lever 10, and the push-pull torsion spring 11 are removed, so that the first swing seat 2 can swing freely. At the same time, the structures of the base 1 and the first swing seat 2 are modified; specifically:

[0053] As shown in Figures 14-20, the base 1 includes a bottom shell 28 and a shaft seat 29. The bottom shell 28 is a shell with an open top. The bottom shell 28 includes a bottom plate 281. The shaft seat 29 is fixedly arranged in the bottom shell 28 and is located above the bottom plate 281. The shaft seat 29 and the bottom shell 28 can be fixed by welding; one end of the first rotating shaft 4 is arranged on the shaft seat 29 and remains relatively stationary with the shaft 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 first swing seat 2; the first rotating shaft 4 and the shaft seat 29 are formed with a special-shaped cross-section by milling the end of the first rotating shaft 4 and a special-shaped hole is opened on the shaft seat 29 to achieve the rotation limit of the two; the first rotating shaft 4 has two, The two first rotating shafts 4 are 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.

[0054] As shown in Figures 15-17, 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 first swing seat 2 swings left and right, and the transverse protrusion 32 is configured to provide support when the second swing 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, during actual use The stress conditions of the chassis are quite different from those of a 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 first swing seat 2 only swings left and right, the seat connected to the second swing seat 3 can produce movements in more directions when both the first and second swing seats 3 can swing freely. Simply setting up ribs for reinforcement cannot meet the requirements, and the longitudinal protrusions 31 and the transverse protrusions 32 are set for the two swinging directions of the swing chassis, decomposing the force when the seat produces movement in other directions into forces in the left and right directions and the front and back directions for support, thereby supporting the complex movements of the swing chassis simply and at low cost.

[0055] 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.

[0056] 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 to ensure structural strength and service life.

[0057] 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 portions 34 are protruding downward from the lower end of the shaft seat 29, and the four positioning portions 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 spring 6 is vertically arranged in the positioning groove 33 formed by the horizontal protrusion 32; 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, so as to save 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.

[0058] 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.

[0059] Furthermore, the lower end of the spring 6 abuts against the base 1, and the upper end of the spring 6 abuts against the first swing 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 positioning when installed, and can also serve as a limit when in use to prevent the spring 6 from being disengaged.

[0060] In addition, as shown in Figures 18-20, the first swing 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 second swing seat 3 and the main body 37 to avoid the second swing 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 371. The second support protrusion 39 is arranged on the upper surface of the supporting portion 371 and protrudes from the upper surface of the tilting supporting portion 372; when the second swinging seat 3 is horizontal, it abuts against the first support protrusion 38; when the second swinging seat 3 tilts backward, it abuts against the second support protrusion 39; the first support protrusion 38 is located at the front end of the horizontal supporting portion 371, and supports and limits the second swinging seat 3 below it when it is horizontal; the second support protrusion 39 is located on the inclined tilting supporting portion 372 and is also in an inclined state. When the second swinging seat 3 tilts backward to the maximum, the second support protrusion 39 supports and limits it below it.

[0061] The swing 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 through smaller changes, and the mold opening cost and material cost are reduced.

Claims

1. A swing chassis device, characterized in that: It includes a base, a first swing seat and a second swing seat. The first swing seat is hinged to the base through a first rotating shaft arranged along the front and back, and the second swing seat is hinged to the first swing seat through a second rotating shaft arranged along the left and right. The first swing seat is configured to drive the second swing seat to swing left and right on the base, and the second swing seat is configured to connect the chair seat and swing back and forth on the first swing seat; an elastic buffer is provided between the first swing seat and the base, and the elastic buffer is configured to provide swing buffering and reset force for the first swing seat.

2. The swing chassis device according to claim 1, characterized in that: A first mounting hole is provided on the first swing seat or one of the bases, a first locking hole is provided on the other of the first swing seat or the base, a first locking member is inserted into the first mounting hole, the first locking member is selectively slidably provided on the first swing seat and the base, and selectively enters or leaves the first locking hole; the first locking member is configured to selectively enter the first locking hole to lock the first swing seat and the base or selectively leave the first locking hole to unlock the first swing seat and the base.

3. The swing chassis device according to claim 2, characterized in that: The first locking piece is arranged along the left and right directions, and an operating rod arranged along the left and right directions is inserted on the base and the first swing seat. The operating rod is connected to the first locking piece, and the operating rod is configured to pull the operating rod to drive the first locking piece to leave or enter the first locking hole.

4. The swing chassis device according to claim 3, characterized in that: A push-pull torsion spring is sleeved on the operating rod, one of the torsion spring arms of the push-pull torsion spring is fixed on the operating rod, and the other torsion spring arm is arranged on the first locking piece. The push-pull torsion spring is configured so that the operating rod drives the first locking piece to move through the push-pull torsion spring.

5. The swing chassis device according to claim 4, characterized in that: The push-pull torsion spring has a bent portion that bends downward and abuts against the base. The base is provided with a convex portion that is configured so that when the operating rod moves, the bent portion passes over the convex portion to allow the first locking piece to enter or leave the first locking hole.

6. The swing chassis device according to claim 2, characterized in that: An operating rod is provided on the base or the first swing seat, and the operating rod is selectively rotated; the operating rod is arranged along the left and right directions, and the first locking member is arranged along the front and back directions. The operating rod is connected to the first locking member, and the operating rod is configured to rotate to drive the first locking member to leave or enter the first locking hole.

7. The swing chassis device according to claim 6, characterized in that: A push-pull torsion spring is sleeved on the operating rod, one of the torsion spring arms of the push-pull torsion spring is fixed on the operating rod, and the other torsion spring arm is arranged on the first locking piece. The push-pull torsion spring is configured so that the operating rod drives the first locking piece to move through the push-pull torsion spring.

8. The swing chassis device according to claim 6, characterized in that: A gear seat is provided on the base or the first swing seat, a synchronously rotating gear member is sleeved on the operating lever, a gear slot is provided on the gear seat, and the gear member is inserted into the gear slot; the gear slot has a first gear position and a second gear position, and a convex portion is provided between the first gear position and the second gear position, and the convex portion protrudes toward the gear slot, and the gear member switches between the first gear position and the second gear position by crossing the convex portion.

9. The swing chassis device according to claim 1, characterized in that: The second swing seat includes two end plates located on the left and right sides, the second rotating shaft is arranged in the middle of the end plate and passes through the first swing seat and the two end plates, one of the end plates is provided with a rotation groove beside the second rotating shaft, and the other end plate is correspondingly provided with a second locking hole; the first swing seat and the second swing seat are unlocked or locked by a second locking member to the relative rotation of the second swing seat and the first swing seat through a second locking member. The first swing seat is provided with a second mounting hole, and the second locking member is inserted in the rotating groove and the second mounting hole, and the second locking member is selectively slidably arranged on the first swing seat and the second swing seat along the left and right directions, and the second locking member is configured to selectively enter the second locking hole to lock the first swing seat and the second swing seat or selectively leave the second locking hole to unlock the second swing seat and the first swing seat; when the second locking member leaves the second locking hole and the second swing seat rotates relative to the first swing seat, the second locking member moves in the rotating groove.

10. The swing chassis device according to claim 1, characterized in that: The elastic buffer is a spring, there are at least two springs, and the springs are symmetrically distributed on both sides of the first rotating shaft; the lower end of the spring abuts against the base, and the upper end of the spring abuts against the first swing 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; the base is formed with an upward convex limiting portion around the opening, and the limiting portion protrudes upward until it enters the spring.

11. The swing chassis device according to claim 1, characterized in that: The elastic buffer is a buffer reset torsion spring, which is sleeved on the first rotating shaft.

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

13. The swing chassis device according to claim 12, characterized in that: The front end of the back connecting member is rotatably connected to the first swing seat; the back connecting member and the second swing seat are linked through a linkage structure, and the linkage structure is configured to drive the second swing seat to swing back and forth when the back connecting member rotates on the first swing seat.

14. The swing chassis device according to claim 13, 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 second swing 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 first swing seat, the sliding rotating member and the sliding rotating groove move and rotate relative to each other, driving the second swing seat to swing back and forth.

15. The swing chassis device according to claim 1, characterized in that: The base has a bottom plate at the bottom, with a protrusion protruding upward or downward on the bottom plate. The protrusion includes a longitudinal protrusion and a transverse protrusion. The longitudinal protrusion is configured to provide support when the first swing seat swings left and right, and the transverse protrusion is configured to provide support when the second swing seat swings back and forth.

16. The swing chassis device according to claim 15, characterized in that: The longitudinal protrusions are arranged along the front-to-back direction, and the transverse protrusions are arranged along the left-to-right direction. The longitudinal protrusions and the transverse protrusions intersect in a cross shape. The intersection of the longitudinal protrusions and the transverse protrusions 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.

17. The swing chassis device according to claim 16, 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.

18. The swing chassis device according to claim 16, 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 first swing seat. The protrusion protrudes downward from the bottom plate, and a downwardly concave positioning groove is formed on the upper surface of the bottom plate at the position of the protrusion. A positioning portion is protruded downward at the lower end of the axle seat, and the positioning portion is arranged in the positioning groove. The elastic buffer is a spring, and the spring is vertically arranged in the positioning groove formed by the transverse protrusion. The swing chassis device according to claim 17, characterized in that the width of the longitudinal protrusion and the transverse protrusion ranges from 30 mm to 40 mm.

19. The swing chassis device according to claim 1, characterized in that: The first swing seat comprises a main body and a supporting seat, the supporting seat protrudes from the upper surface of the main body, and a gap is provided between the second swing seat and the main body.

20. The swing chassis device according to claim 19, characterized in that: The main body includes a horizontal supporting portion and a tilting 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 tilting 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. The second supporting protrusion is arranged on the tilting supporting portion and protrudes from the upper surface of the tilting supporting portion. When the second swinging seat is horizontal, it abuts against the first supporting protrusion. When the second swing seat tilts backward, it abuts against the second supporting protrusion.

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