Swing Chassis Device

This application claims the priority benefit of China application serial no. 202420678320.1, filed on Apr. 3, 2024 and China application serial no. 202422597415.3 filed on Oct. 26, 2024. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

The disclosure relates to the field of furniture, and in particular, to a swing chassis device.

As one of the most common pieces of furniture, chairs accompany us for a large amount of time during the day. Especially in offices, users spend most of their day sitting on chairs. However, prolonged sitting has led to increasing comfort and health-related issues. In terms of comfort, maintaining the same sitting posture for extended periods may cause people to feel more fatigued, experience neck and back discomfort, and numbness in the buttocks and legs. This discomfort may make it difficult for people to keep a pleasant mood and focus on work. Regarding health issues, maintaining the same posture for long periods of sitting may lead to compression of the lumbar spine and legs, thereby increasing the incidence of diseases such as lumbar spine disorders.

People have found that standing up after prolonged sitting may alleviate fatigue, and while seated, changing sitting postures may also effectively eliminate fatigue and reduce the harmful effects of prolonged sitting. Therefore, how to achieve greater flexibility in changing postures and make the transition more comfortable is the key to solving the aforementioned problems and achieving a more comfortable and healthy sitting experience.

To solve the above technical problems, the disclosure provides a swing chassis device including a base, a first swing seat, and a second swing seat. The first swing seat is hinged onto the base through a first rotating shaft. The second swing seat is hinged onto the first swing seat through a second rotating shaft. The second swing seat swings back and forth. The first swing seat drives the second swing seat to swing left and right together. An elastic buffer member for providing buffering and a restoring force is disposed between the first swing seat and the base. The base is configured to be connected a chair leg air rod. Under the action of the first swing seat, the first swing seat swings left and right on the base, and the second swing seat swings back and forth on the first swing seat and swings left and right together with the first swing seat under the driving of the first swing seat. In this way, a chair seat connected to the second swing seat swings back and forth and left and right. Further, the flexibility of swinging is increased, a user can change his/her sitting posture flexibly and freely, and more sitting postures can be adapted, so the user is able to enjoy improved comfort. The elastic buffering member further enhances the comfort during swinging.

The technical solution of the disclosure is achieved in this way:

The disclosure provides a swing chassis device including a base, a first swing seat, and a second swing seat. The first swing seat is hinged onto the base through a first rotating shaft arranged in a front-rear direction. The second swing seat is hinged onto the first swing seat through a second rotating shaft arranged in a left-right direction. 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 be connected to a chair seat and swing back and forth on the first swing seat. An elastic buffer member is provided between the first swing seat and the base and is configured to provide swing buffering and a restoring force for the first swing seat.

The disclosure adopting the above technical solutions exhibits the following design starting point, concepts, and beneficial effects.

The base is configured to be connected a chair leg air rod. Under the action of the first swing seat, the first swing seat swings left and right on the base, and the second swing seat swings back and forth on the first swing seat and swings left and right together with the first swing seat under the driving of the first swing seat. In this way, a chair seat connected to the second swing seat swings back and forth and left and right. Further, the flexibility of swinging is increased, a user can change his/her sitting posture flexibly and freely, and more sitting postures can be adapted, so the user is able to enjoy improved comfort. The elastic buffering member further enhances the comfort during swinging.

An overall floating swing chassis (such as when springs are mounted at the four corners of the chassis) has less favorable dynamic capabilities. When there is a main beam fixed between two components, the components on both sides of the main beam are able to rotate relative to each other, and a spring is arranged between the two components, improved flexibility is provided, and the range of swing increases. Taking the function of swinging left and right 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. Elastic buffer members are disposed on both sides of the first rotating shaft, and 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 swing relative to the base. Such an arrangement brings improved flexibility, the swing feeling is more obvious, and it can better meet the user's needs to switch sitting postures.

To make the aforementioned more comprehensible, several embodiments accompanied with drawings are described in detail as follows.

The reference numerals in each accompanying drawing are: base, first swing seat, second swing seat, first rotating shaft, second rotating shaft, spring, first mounting hole, first locking hole, first locking member, operating rod, push-pull torsion spring, bent portion, convex portion, end plate, rotation slot, second locking hole, second locking member, second mounting hole, buffer restoring torsion spring, gear seat, gear member, gear slot, first gear, second gear, back connecting member, slidable rotating member, slidable rotating slot, connecting seat, bottom shell, bottom plate, shaft seat, insertion hole, longitudinal protruding portion, lateral protruding portion, positioning groove, positioning portion, opening, limiting portion, main body portion, horizontal supporting portion, tilt supporting portion, first support protruding seat, and second support protruding seat.

The specific embodiments of disclosure are as follows:

As shown into, the disclosure provides a swing chassis device including a base, a first swing seat, and a second swing seat. The first swing seatis hinged on the basethrough a first rotating shaftarranged in a front-rear direction, and the second swing seatis hinged on the first swing seatthrough a second rotating shaftarranged in a left-right direction. The first swing seatis configured to drive the second swing seatto swing left and right on the base, and the second swing seatis configured to be connected to a chair seat and swing back and forth on the first swing seat. An elastic buffer member is provided between the first swing seatand the baseand is configured to provide swing buffering and a restoring force for the first swing seat.

The baseis configured to be connected a chair leg air rod. Under the action of the first swing seat, the first swing seatmay swing left and right on the base, and the second swing seatmay swing back and forth on the first swing seatand may swing left and right together with the first swing seatunder the driving of the first swing seat. This allows the chair seat connected to the second swing seatto swing back and forth and left and right, and flexibility of swing is thereby improved. In this way, a user can change his/her sitting posture flexibly and freely, and more sitting postures can be adapted, so the user is able to enjoy improved comfort. The elastic buffering member further enhances the comfort during swinging.

To be specific, as shown into, there are two first rotating shafts, which hinged to a front portion of the basewith a front portion of the first swing seatand a rear portion of the basewith a rear portion of the first swing seat. The elastic buffering member is a spring, and there are four springsin total. The springsare vertically arranged and symmetrically distributed on both sides of the first rotating shafts, that is, there are two springson each side, and the springson both sides are symmetrically distributed to maintain the balance of force.

A first mounting holeis formed on one of the first swing seatand the base, and a first locking holeis formed on the other one of the first swing seatand the base. In this embodiment, two first mounting holesare formed on the base, one first locking holeis formed on the first swing seat, and the two first mounting holesare coaxial and distributed in the left-right direction. A first locking memberdisposed in the left-right direction is inserted in the first mounting hole. The first locking memberis selectively slidably disposed on the base, and selectively enters or leaves the first locking hole. The first locking memberis configured to selectively enter the first locking holeto lock the first swing seatand the baseor selectively leave the first locking holeto unlock the first swing seatand the base.

Movement of the first locking memberis controlled by an operating rod. The operating rodis inserted in the basein the left-right direction. The operating rodis connected to the first locking memberthrough a push-pull torsion spring. When the operating rodslides left and right on the base, the operating roddrives the push-pull torsion springto move, which in turn drives the first locking memberto move. Furthermore, one of torsion spring arms of the push-pull torsion springis fixed onto the operating rod, and the other torsion spring arm of the push-pull torsion springis disposed on the first locking member. The push-pull torsion springis located inside the baseand the first swing seat. The push-pull torsion springhas a bent portion, and the bent portionis bent downward and abuts against the base. A convex portionis disposed on the base, and the convex portionis disposed on a movement path of the push-pull torsion spring. When the operating roddrives the push-pull torsion springand thus drives the first locking memberto slide, the push-pull torsion springabutting against the basepasses through the convex portion. When the push-pull torsion springmoves towards the first locking holeand passes through the convex portion, the first locking memberenters the locking hole. The fitting between the push-pull torsion springand the convex portiongives the user a tactile feedback of locking the first swing seatand the base. Conversely, feedback can also be received when unlocking. In this way, through the combination of the elasticity of the push-pull torsion springand the convex portion, the unlocking and locking operations can be completed in one step, and the completion of unlocking and locking is fed back to the user, allowing the user to clearly understand the current state of the chassis device.

In the above solution, the pull-out operating rodis convenient for the user to operate, so as to drive the first locking memberto slide. The first locking membermay be slidably disposed on the first swing seatand the base, and the first locking memberis inserted in the first mounting holeand slidably fitted to the first mounting hole. Further, when the first locking memberslides towards the first locking holeand enters the first locking hole, it can lock the first swing seatwith the base, so the first swing seatis prevented from moving on the base. Similarly, when the first locking memberleaves the first locking hole, the first swing seatand the baseare unlocked, so the first swing seatis able to move on the base.

The second swing seatincludes two end plateslocated on the left and right sides, the two end plates protrude downward and are positioned on both sides of the first swing seat. The second swing seat, the first swing seat, and the baseare arranged from top to bottom in sequence. The second rotating shaftis disposed in the middle of the end platesand passes through the first swing seatand the two end plates. A rotation slotis formed on one of the end platesbeside the second rotating shaft, and a second locking holeis correspondingly formed on the other end plate. Relative rotation between the second swing seatand the first swing seatis unlocked or locked by a second locking member. A second mounting holeis provided on the first swing seat, and the second locking memberis inserted in the rotation slotand the second mounting hole. The second locking memberis selectively slidably disposed on the first swing seatand the second swing seatin the left-right direction. The second locking memberis configured to selectively enter the second locking holeto lock the first swing seatand the second swing seator selectively leave the second locking holeto unlock the second swing seatand the first swing seat. When the second locking memberleaves the second locking holeand the second swing seatrotates relative to the first swing seat, the second locking membermoves in the rotation slot.

In an up-down direction, there are gaps between both left and right ends of the first swing seatand the base, and these gaps allow clearance for the first swing seatto swing left and right on the base.

The difference between this embodiment and Embodiment 1 lies only in the number of springs, specifically as follows:

As shown inand, in this embodiment, there are two springsin total, and the two springsare vertically and symmetrically distributed on both sides of the first rotating shaft.

The difference between this embodiment and Embodiment 1 lies only in the elastic buffering member and its arrangement method, specifically as follows:

As shown in, the elastic buffering member is a buffering restoring torsion springsleeved on the first rotating shaft. The number of buffering restoring torsion springsis at least an even number. In this embodiment, considering the costs, two buffering restoring torsion springsare selected. The two buffering restoring torsion springsare sleeved on the two first rotating shafts. The two torsion spring arms of the buffering restoring torsion springact on the baseand the first swing seatand face opposite directions to maintain the force balance on both left and right sides of the first rotating shaft.

When more buffering restoring torsion springsare selected, in order to maintain the force balance on both left and right sides of the first rotating shaft, and to ensure that the number of torsion spring arms on both sides of the first rotating shaftis the same, the number of buffering restoring torsion springswith torsion spring arms facing the left side is equal to the number of buffering restoring torsion springswith torsion spring arms facing the right side.

The difference between this embodiment and Embodiment 1 lies in the locking and unlocking operation method between the first swing seatand the base, specifically as follows:

As shown into, this solution drives the movement of the first locking memberthrough the rotatable operating rodto achieve locking and unlocking of the first swing seat. The operating rodis provided on the first swing seatand is selectively rotatable. The operating rodis arranged in the left-right direction, the first locking memberis arranged in the front-rear direction. The operating rodis connected to the first locking memberand is configured so that the operating rodrotates to drive the first locking memberto leave or enter the first locking hole. There are two first locking membersin total, and the two first locking membersare symmetrically arranged on both sides of the first rotating shaft. Since the first locking memberin this solution is slidably arranged in the front-back direction, when both sides of the first swing seatand the baseare acted upon by the first locking members, balance and stability when locked is maintained.

The push-pull torsion springis sleeved on the operating rod. One of torsion spring arms of the push-pull torsion springis fixed onto the operating rod, and the other torsion spring arm of the push-pull torsion springis disposed on the first locking member. The push-pull torsion springis configured so that the operating roddrives the first locking memberto move via the push-pull torsion spring. The push-pull torsion springmay convert the rotation of the operating rodinto a sliding driving force for the first locking member. Further, a gear seatis provided on the first swing seat. The operating rodis provided with a synchronously rotating gear member. A gear slotis provided on the gear seat, and the gear memberis inserted into the gear slot. The gear slothas a first gearand a second gear. A convex portionprotruding toward the gear slotis provided between the first gearand the second gear. The gear member switches between the first gearand the second gearby crossing the convex portion. The convex portionprovides inertia during gear switching to enhance the operational feel. The user may sense the completion of gear switching, and after the gear switching is completed, the gear memberremains in the current gear position.

The difference between this embodiment and Embodiment 4 lies in the arrangement of a back connecting memberto achieve seat-back linkage, specifically as follows:

As shown inand, this solution allows a chair back and the chair seat to swing left and right together: A back connecting memberis provided on the first swing seatand is configured to be connected to the chair back and swing with the swing of the first swing seat. A front end of the back connecting memberis rotatably connected onto the first swing seat. The back connecting memberand the second swing seatare linked by a linkage structure configured to drive the second swing seatto swing back and forth when the back connecting memberrotates on the first swing seat. The back connecting memberis linked with the second swing seat, so that when the chair back reclines, the second swing seatmay also swing backward and tilt up at the front, and overall comfort is thereby enhanced. The back-and-forth swinging of the second swing seatmay be directly applied to the seat-back linkage when the chair back reclines.

Further, the linkage structure includes a slidable rotating memberand a slidable rotating slot. A connecting seatis extended obliquely downward from the rear of the second swing seat. The connecting seatis connected to the slidable rotating memberarranged in the left-right direction. The slidable rotating slotis provided on the back connecting member, and the slidable rotating memberis inserted into the slidable rotating slot. When the back connecting memberrotates on the first swing seat, the slidable rotating memberand the slidable rotating slotmove and rotate relative to each other and drive the second swing seatto swing back and forth. This solution achieves the linkage between the back connecting memberand the second swing seat, so seat-back linkage is achieved with a simpler structure.

The difference between this embodiment and Embodiment 2 lies only in the removal of the locking structure for the left-right swinging direction. That is, the first locking hole, the first locking member, the operating rod, and the push-pull torsion springare removed, allowing the first swing seatto swing freely. Meanwhile, the structures of the baseand the first swing seatare modified, specifically as follows:

As shown into, the baseincludes a bottom shelland a shaft seat. The bottom shellis an open-top shell body and includes a bottom plate. The shaft seatis fixedly disposed in the bottom shelland located above the bottom plate. The shaft seatmay be fixed to the bottom shellby welding. One end of the first rotating shaftis disposed on the shaft seatand remains stationary relative to the shaft seat, while the other end of the first rotating shaftprotrudes outward from the bottom shelland is rotatably connected to the first swing seat. The rotation limit between the first rotating shaftand the shaft seatis achieved by turning and milling the end portion of the first rotating shaftto form an irregular cross-section and creating a corresponding irregular hole on the shaft seat. There are two first rotating shafts, protruding from the front and rear ends of the base. The two first rotating shaftsare coaxial and spaced apart. At this interval, an insertion holefor inserting an air rod is formed on the base, specifically extending from the bottom platethrough the shaft seat. The first rotating shaftis not a single rotating shaft penetrating the base. The gap between the two shafts naturally avoids the air rod, preventing the chassis from being forced to increase in thickness due to conflicts between the air rod and the first rotating shaftpositions, making the overall structure thinner. A distance between a seat surface and a bottom surface of the chassis is reduced, and a lowest height of the seat surface is thus lowered, making it more comfortable. If the lowest height of the seat surface is excessively high, the front end of the chair seat may easily hit the thigh when the chair seat tilts backward, thereby reducing comfort.

As shown into, a bottom portion of the basehas a protruding portion protruding upward or downward, specifically disposed on the bottom plateof the bottom shell. In this embodiment, the protruding portion protrudes downward on the bottom plate. To be specific, the protruding portion includes a longitudinal protruding portionand a lateral protruding portion. The longitudinal protruding portionis configured to provide support when the first swing seatswings left and right, and the lateral protruding portionis configured to provide support when the second swing seatswings back and forth. The protruding portion is arranged to increase the strength of the base, and as the baseserves as the main support of the chassis for connecting the air rod, increasing its strength can ensure the structural strength and support stability of the chassis. Since this chassis has a swinging function, the stress conditions during actual use are different from a conventional chassis, and the baseconsequently is subjected to forces from multiple directions. Therefore, higher strength requirements are needed, especially for forces in different directions. Although the first swing seatonly swings left and right, the chair seat connected to the second swing seatproduces movements in more directions when both the first swing seatand the second swing seatswing freely. Simply setting up reinforcing ribs cannot meet the requirements. The longitudinal protruding portionand the lateral protruding portionare arranged for the two swinging directions of this swinging chassis, decomposing the forces generated when the chair seat moves in other directions into left-right and front-back forces for support, thus providing simple and low-cost support for the complex movements of the swing chassis.

The longitudinal protruding portionis arranged in the front-rear direction, and the lateral protruding portionis arranged in the left-right direction. The longitudinal protruding portionand the lateral protruding portionintersect to form a cross shape. The intersection of the longitudinal protruding portionand the lateral protruding portioncoincides with a center position of the bottom plate. The insertion holeis opened at the center position of the bottom plate. An intersection point of projections of axes of the first rotating shaftand the second rotating shafton the bottom platefalls within a coverage of the insertion hole. That is, the intersection point of the projections of the axes of the first rotating shaftand second rotating shaftis also located at the middle position of the protruding portion, to achieve a more balanced effect of force stability.

The longitudinal protruding portionand the lateral protruding portionachieve increased support strength for swinging in different directions through their different extension arrangement directions. Meanwhile, the protruding portion as a whole forms a cross shape, which simplifies the structure and reduces manufacturing difficulty and costs. The insertion holeis located at the center of the bottom plate, which is also at the middle of the protruding portion. When the basetransmits force to the air rod or receives a reaction force from the air rod, the protruding portion can also serve to increase the strength of the base, so structural strength and service life are ensured.

Further, the protruding portion protrudes downward from the bottom plate, and a positioning grooveis formed on an upper surface of the bottom plateat a position of the protruding portion. The positioning grooveis also cross-shaped. The lower end of the shaft seatis provided with four downwardly protruding positioning portionsdisposed in the positioning groovesin four directions. Only a single springis disposed on one side of the first rotating shaft, and the springis vertically arranged in the positioning grooveformed by the lateral protruding portion. The bottom plateis stamped downward to form the protruding portion, which is more cost-effective than mold-making. Further, this means that except for the insertion holeand the protruding portion, other parts of the bottom of the baseare relatively recessed upward, so material costs are saved. With the function of the positioning groove, the installation and connection of the shaft seatand the springare more convenient.

Widths of the longitudinal protruding portionand the lateral protruding portionrange from 30 mm to 40 mm. The widths of the longitudinal protruding portionand the lateral protruding portionare both relatively wide, while a length and a width of the bottom plateare generally between 80 mm to 100 mm. The protruding portion occupies a large proportion on the bottom plate, resulting in a larger overall force-bearing area of the protruding portion, so stress concentration problems are prevented and the strength-increasing effect of the protruding portion is improved. In this embodiment, the width of the longitudinal protruding portionis 32 mm, the width of the lateral protruding portionis 37 mm, the length of the bottom platein the front-back direction is 85 mm, and the length of the bottom platein the left-right direction is 98 mm.

Further, a lower end of each springabuts against the base, and an upper end of each springabuts against the first swing seat. A bottom portion of the baseis provided with an opening, and the openingis coaxial with the spring. The springis disposed at the openingand is located above the opening. An anti-detachment rod (not shown) may be inserted into the springthrough the openingto prevent the upper and lower ends of the springfrom detaching. The baseis formed with an upwardly protruding limiting portionaround the opening, and the limiting portionprotrudes upwardly to enter the spring. The limit portionis formed by stamping simultaneously with the opening, and the openingis located on the protruding portion at the bottom portion of the base. The openingis disposed at the bottom of the base, and the part around the edge of the openingis stamped upward and enters the spring, providing positioning for the mounting of the springand also serving as a limit during use to prevent the springfrom detaching.

In addition, as shown into, the first swing seatincludes a main body portionand a support seat protruding from an upper surface of the main body portion. A gap is provided between the second swing seatand the main body portionfor accommodating the forward and backward tilt of the second swing seat. To be specific, the main body portionincludes a horizontal supporting portionand a tilt supporting portion. The support seat includes a first support protruding seatand a second support protruding seat. The horizontal supporting portionis arranged horizontally, and the tilt supporting portionis arranged at a rear end of the horizontal supporting portionin a downwardly inclined manner. The first support protruding seatis disposed on the horizontal supporting portionand protrudes from an upper surface of the horizontal supporting portion. The second support protruding seatis disposed on the tilt supporting portionand protrudes from an upper surface of the tilt supporting portion. When the second swing seatis horizontal, it abuts against the first support protruding seat. When the second swing seattilts backward, it abuts against the second support protruding seat. The first support protruding seatis located at a front end of the horizontal supporting portion, supporting and limiting the second swing seatunderneath when it is horizontal. The second support protruding seatis located on the inclined tilt supporting portionand is also in an inclined state. When the second swing seattilts backward to the maximum, the second support protruding seatsupports and limits it underneath.

Under the premise of retaining the front and rear tilting, the left and right tilting effect is added to the swing chassis device, and the required cost is low. Only one swing seat and the corresponding internal parts are added to the original basic chassis. There is no need to make major changes to other components of the chassis, and there is no need to add extended parts on the left and right sides to mount the spring. The same effect is achieved through less changes, and both mold opening costs and material costs are reduced.

It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents.