Swing structure for movable seat unit and seat unit

Abstract

The present application relates to a swing structure for a movable seat unit. The seat unit comprises a fixed base, a linkage structure and a swing structure, wherein the swing structure can enable the linkage structure to swing in a front-back direction of the seat unit relative to the fixed base. The swing structure comprises: a swing actuating mechanism fixedly positioned relative to the fixed base; and an eccentric transmission mechanism, which comprises a crank and a transmission arm in pivotal connection with each other, wherein the eccentric transmission mechanism is coupled to the swing actuating mechanism at a rotation point by means of the crank thereof, and is coupled to the linkage structure at a transmission action point by means of the transmission arm thereof, such that a swing actuating moment generated by the swing actuating mechanism is transmitted to the linkage structure, and the coupling between the transmission arm and the linkage structure is achieved by means of a universal shaft device. The present application further relates to a seat unit comprising the swing structure.

Description

Rocking structure for movable seat unit and seat unit

[0001] This application claims priority to Chinese Patent Application No. 2023226629832 filed on September 28, 2023, and the contents of the above-mentioned Chinese patent application disclosure are hereby incorporated by reference in their entirety as part of this application. Technical Field

[0002] The present application relates to a rocking structure for a movable seat unit and a seat unit comprising the rocking structure. Background Art

[0003] Various movable seating units are known in the prior art, such as sofas or chairs with multi-position switching capabilities. As people's living standards improve, the demand for comfort in sofas and chairs is also increasing. In known designs, movable seating units typically include a mechanical extension mechanism that allows them to be switched between a sitting position, a leisure position (or TV position), and a reclining position. When the seating unit switches from the sitting position to the leisure position, the footrest of the seating unit extends forward, and the angle between the backrest and the seat remains essentially unchanged. When the seating unit switches from the leisure position to the reclining position, the footrest is raised further forward and upward than in the leisure position, and the backrest reclines significantly. Furthermore, these types of movable seats typically also have a swinging function, meaning that the mechanical extension mechanism of the seating unit can swing back and forth as a whole relative to the base or the ground. The aforementioned position switching and swinging functions between the sitting position, leisure position, and reclining position can be accomplished electrically.

[0004] However, the disadvantage of the known design is that the swing amplitude of the seat unit is too small and the swing frequency is too fast, so that the user often does not get a satisfactory comfort experience and may even feel dizzy. In addition, the connection method between the swing structure used to swing the seat unit back and forth and other components of the seat unit is not very reasonable, resulting in excessive wear of the components of the swing structure, shortening its service life.

[0005] Summary of the Invention

[0006] The technical problem to be solved by the present application is to provide a seat unit with optimized structure and higher comfort.

[0007] To solve the above technical problems, the present application provides a rocking structure for a movable seat unit, wherein the seat unit includes a fixed base, two mirror-symmetrical and mutually parallel linkage structures, and a rocking structure coupled between the fixed base and the linkage structures, wherein the rocking structure enables the linkage structures to rock relative to the fixed base in the front-rear direction of the seat unit, wherein the rocking structure includes:

[0008] a rocking actuating mechanism fixedly disposed relative to the fixed base;

[0009] An eccentric transmission mechanism includes a crank and a transmission arm pivotally connected to each other, wherein the eccentric transmission mechanism is coupled to the rocking actuator mechanism by means of its crank, and is coupled to the linkage structure by means of its transmission arm, thereby transmitting the rocking actuator torque generated by the rocking actuator mechanism to the linkage structure, and wherein the coupling between the transmission arm and the linkage structure is achieved through a universal joint device.

[0010] In this embodiment, preferably, the crank is coupled to the rocking actuating mechanism at a rotation point, and the transmission arm is coupled to the linkage structure (3) at a transmission action point.

[0011] Compared to a system where the swing actuator and the linkage structure rely solely on a one-piece eccentric transmission mechanism (e.g., an integrated eccentric wheel), the eccentric transmission device according to the present application includes a crank and a transmission arm connected to the crank. In this multi-piece, for example, two-piece, eccentric transmission device, by adjusting the length of the crank coupled to the power source, i.e., the swing actuator, a larger eccentric distance is provided, thereby significantly increasing the swing stroke, allowing the entire linkage structure to swing back and forth with a larger amplitude, providing a more comfortable experience for the user. In addition, the transmission arm is coupled to the linkage structure via a universal joint device. This effectively avoids any possible motion jamming caused by assembly tolerances or dimensional tolerances, providing better mechanical properties, and also provides better wear resistance, thereby increasing the service life.

[0012] In a preferred embodiment, the rocking structure can realize the alternating transformation of the seat unit between a first rocking posture (rearward swing limit posture) and a second rocking posture (forward swing limit posture). In the first rocking posture, the distance between the rotation point and the transmission action point is the largest, and in the second rocking posture, the distance between the rotation point and the transmission action point is the smallest.

[0013] In this embodiment, when the transmission action point is located at the rear of the seat unit, the seat unit achieves the rearward swing limit posture in the first swing posture, and the seat unit achieves the forward swing limit posture in the second swing posture; accordingly, when the transmission action point is located at the front of the seat unit, the seat unit achieves the forward swing limit posture in the first swing posture, and the seat unit achieves the rearward swing limit posture in the second swing posture.

[0014] In a preferred embodiment, the transmission arm is coupled to a transverse rod which is directly or indirectly connected to the linkage structure.

[0015] In this embodiment, the transverse rod can be directly coupled to the linkage structure by means of welding, riveting, threaded connection, etc., or can be a component integrally constructed with the components of the linkage structure; optionally, the transverse rod can also be indirectly coupled to the components of the linkage structure by means of other intermediate connecting parts, such as connecting rods.

[0016] In this embodiment, the cardan shaft arrangement particularly preferably includes a drive arm ball head formed on the end of the drive arm and a ball head receptacle fixedly disposed on the transverse rod. The ball head receptacle may be a recess directly formed in the transverse rod itself and capable of forming a cardanic connection with the drive arm ball head in a form-fitting manner. Alternatively and preferably, a separate component may be provided on the transverse rod, fixedly connected, for example, by welding, riveting, or screwing, and having a ball head receptacle adapted for the drive arm ball head.

[0017] To solve the above technical problems, the present application further provides a movable seat unit comprising: a fixed base; a rocking structure; and two mirror-symmetrical and parallel linkage structures. The linkage structure comprises a seat support, a backrest assembly pivotally connected to the rear of the seat support, a leg extension device pivotally connected to the front of the seat support, and a transmission connecting rod fixedly connected to the seat support. The rocking structure is coupled between the fixed base and the linkage structure and is capable of causing the linkage structure to swing relative to the fixed base in the front-to-back direction of the seat unit. The rocking structure comprises:

[0018] a rocking actuating mechanism fixedly disposed relative to the fixed base;

[0019] An eccentric transmission mechanism includes a crank and a transmission arm pivotally connected to each other, wherein the eccentric transmission mechanism is coupled to the rocking actuator mechanism by means of its crank, and is coupled to the linkage structure by means of its transmission arm, thereby transmitting the rocking actuator torque generated by the rocking actuator mechanism to the linkage structure, and wherein the coupling between the transmission arm and the linkage structure is achieved through a universal joint device.

[0020] In this embodiment, preferably, the crank is coupled to the rocking actuating mechanism at a rotation point, and the transmission arm is coupled to the linkage structure (3) at a transmission action point.

[0021] In a preferred embodiment, the rocking structure realizes the alternating transformation of the seat unit between a first rocking posture and a second rocking posture. In the first rocking posture, the distance between the rotation point and the transmission action point is the largest, and in the second rocking posture, the distance between the rotation point and the transmission action point is the smallest.

[0022] In a preferred embodiment, the transmission arm is coupled to a transverse rod which is directly or indirectly connected to the linkage structure.

[0023] In a preferred embodiment, the cardan shaft arrangement comprises a drive arm ball head formed on the end of the drive arm and a ball head receptacle fixedly arranged on the transverse rod.

[0024] The advantages described above with respect to the rocking structure also apply accordingly to the seat unit comprising the rocking structure.

[0025] In a preferred embodiment, the swing structure further comprises a swing base fixedly connected to the fixed base, a front swing lever and a rear swing lever pivotally connected between the swing base and the linkage structure, wherein the front swing lever is pivotally connected to the front end of the swing base by means of its upper end, and the rear swing lever is pivotally connected to the rear end of the swing base by means of its upper end, and the lower end of the front swing lever and the lower end of the rear swing lever are pivotally connected to the transmission connecting rod respectively. Thus, by means of the actuation of the transverse rod by the swing actuating mechanism, the front swing lever and the rear swing lever "hang" the transmission connecting rod together with the seat bracket fixedly connected thereto, and even the entire linkage structure, on the swing base. The swinging of the front swing lever and the rear swing lever causes the linkage structure to swing back and forth.

[0026] In a preferred embodiment, the transverse bar is a rear transverse bar, wherein both ends of the rear transverse bar are fixedly connected to the backrest assembly.

[0027] In this embodiment, the backrest assembly preferably includes a backrest bracket, a backrest connector, and a rear connector, wherein the backrest bracket is pivotally connected at its front end to the rear portion of the seat bracket, the rear end of the backrest bracket is pivotally connected to the upper end of the rear connecting rod via the backrest connector, and the lower end of the rear connecting rod is pivotally connected to the transmission connecting rod, wherein the rear cross bar is fixedly connected to the rear connecting rod at its two ends. Of course, as an alternative, the rear cross bar may also be fixedly connected to other components of the backrest assembly, such as the backrest bracket or the backrest connector.

[0028] In an alternative embodiment, the rocking structure further includes a rocking base, the top surface of which is fixedly connected to the rocking mounting plate of the linkage structure, and the bottom surface of which is arcuately configured and rockably supported on the fixed base, wherein the rocking mounting plate is fixedly connected to the transmission connecting rod. Unlike the embodiment having a front rocking rod and a rear rocking rod, in this embodiment, the rocking base is used to achieve the forward and backward rocking of the linkage structure.

[0029] In a preferred embodiment, the transverse rod is a rocking transverse rod, wherein the rocking transverse rod is fixedly connected to the rocking mounting plate at both ends. Thus, by actuating the rocking transverse rod by the rocking actuating mechanism, the rocking mounting plate is rocked back and forth on the fixed base by means of the arc-shaped bottom surface of the rocking base, thereby driving the linkage structure fixed to the rocking mounting plate to rock back and forth.

[0030] In a preferred embodiment, the fixed base includes two base longitudinal beams extending parallel to each other and a base transverse beam transversely connected between the base longitudinal beams.

[0031] Preferably, the fixed base is supported directly on the ground.

[0032] In an alternative embodiment, the seat unit further comprises a swivel support, wherein the fixed base is rotatably connected above the swivel support, and the swivel support is directly supported on the ground with its bottom, thereby realizing a rotatable seat unit.

[0033] In a preferred embodiment, the chair unit further comprises a seat attached to the seat frame, a footrest attached to the leg extension, and a backrest attached to the backrest assembly, wherein the linkage structure enables the chair unit to be transformed between a sitting position and a TV position and / or a reclining position. In the sitting position, the footrest is folded under the seat; in the TV position, the footrest is located in front of the seat, and the angle between the seat and the backrest remains substantially the same as in the sitting position; in the reclining position, the angle between the seat and the backrest is increased relative to that in the TV position. This provides further comfort for the user.

[0034] In this embodiment, preferably, the seat unit further comprises a linkage actuating mechanism, which is used to drive the linkage structure, thereby enabling the seat unit to be transformed between a sitting position and a TV position and / or a lying position. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The embodiments of the present application are explained in detail below with reference to the accompanying drawings.

[0036] FIG1 shows a perspective view of a movable seat unit according to a first embodiment of the present application;

[0037] FIG2 shows another perspective view of the seat unit shown in FIG1 ;

[0038] FIG3 shows another perspective view of the seat unit shown in FIG1 ;

[0039] FIG4 shows a partial perspective view of a rocking structure according to the present application;

[0040] FIG5 shows a partial side view of the rocking structure shown in FIG4 ;

[0041] FIG6 shows a side view of the seat unit shown in FIG1 , in a neutral position in which pivoting has not yet occurred;

[0042] FIG7 shows a side view of the seat unit shown in FIG6 , in a first swing position;

[0043] FIG8 shows a side view of the seat unit shown in FIG6 , in a second swing position;

[0044] FIG9 shows a perspective view of a movable seat unit according to a second embodiment of the present application;

[0045] FIG10 shows a partial perspective view of a movable seat unit according to a third embodiment of the present application; and

[0046] FIG. 11 shows a side view of the seating unit shown in FIG. 10 . DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] The terms "one embodiment" or "embodiment" herein refer to specific features, structures, or characteristics that may be included in at least one implementation of the present application. In the description of this application, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicating positions or locations, are based on the positions or locations shown in the accompanying drawings and are intended solely for ease of description and simplification. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific manner, and are therefore not to be construed as limiting the present application. It should also be noted that the terms "fore-and-aft direction" or "fore-and-aft direction of the seat unit" refer to the directions of the seat unit's backrest and footrest relative to the seat portion, where the direction "rear" refers to the direction toward the backrest, and the direction "fore-and-aft" refers to the direction toward the footrest. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features designated "first" or "second" may explicitly or implicitly include one or more of such features. Furthermore, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can be implemented in orders other than those illustrated or described herein.

[0049] First, a seat unit according to a first embodiment of the present application is illustrated by way of example with reference to Figures 1 to 8 . The seat unit comprises a base unit 1, a rocking structure 2, and a linkage structure 3, wherein the rocking structure 2 is disposed between the base unit 1 and the linkage structure 3, and the linkage structure 3 is swingably supported above the base unit 1 by means of the rocking structure 2. The seat unit also comprises a seat portion attached to the linkage structure, a backrest located behind the seat portion, and a footrest located in front of the seat portion. For the sake of clarity, these components are not shown in the figures. The rocking structure 2 enables the linkage structure 3 to swing forward and backward relative to the base unit 1.

[0050] The base unit 1 includes a rotating base directly supported on the ground and a fixed base rotatably supported above the rotating base. The rotating base includes a circular base 11 and a rotating support 12 rotatably coupled to the circular base 11. The fixed base includes two base longitudinal beams 13 extending parallel to each other and a base cross beam 14 connected between the base longitudinal beams 13. The circular base 11 is supported on the ground at its bottom, while the fixed base is fixedly mounted on the rotating support 12, allowing the fixed base to rotate relative to the ground.

[0051] As shown in FIG1 , the seat unit is provided with two mutually parallel linkage structures 3 on the left and right sides in a mirror-symmetrical manner. The linkage structure 3 includes a multi-link mechanism, and the linkage structure 3 is constructed so that the seat unit can be transformed between a sitting position and a lying position. However, the present application is not limited to this. In other embodiments not shown, the seat unit can also be transformed only between a sitting position, a TV position and a lying position, or only between a sitting position and a TV position. For the sake of clarity, the linkage structure on one side is respectively omitted in FIG2 and FIG3 .

[0052] The linkage structure 3 includes a seat assembly 31, a backrest assembly 32, and a leg extension device 33. By means of the linkage actuation mechanism 4, the linkage structure 3 can be transformed between a sitting position, a TV position, and / or a lying position by moving the backrest assembly 32 and the leg extension device 33 relative to the seat assembly 31.

[0053] In this embodiment, the seat assembly 31 includes a seat bracket 311 and a transmission connecting rod 312 fixedly connected to the seat bracket 311, wherein the front end of the transmission connecting rod 312 is fixedly connected to the seat bracket 311, and the transmission connecting rod 312 first extends backward and downward from its front end, and then extends backward approximately horizontally, and an inclined fixed support rod 313 is also fixedly connected between the rear end of the transmission connecting rod 312 and the seat bracket 311, thereby forming a stable and firm frame structure through the seat bracket 311, the transmission connecting rod 312 and the fixed support rod 313.

[0054] The backrest assembly 32 includes a backrest bracket 321, a backrest connector 322, and a rear connector 323. The backrest bracket 321 is generally L-shaped, comprising a horizontal section extending generally horizontally in the sitting position and a vertical section extending generally vertically. The front end of the backrest bracket 321 is pivotally connected to the rear of the seat bracket 311, and the rear end of the backrest bracket 321 is pivotally connected to the rear connecting rod 323 via the backrest connector 322. The backrest connector 322 is constructed as a crank member, wherein the first end of the backrest connector 322 is pivotally connected to the rear end of the backrest bracket 321, the second end of the backrest connector 322 is pivotally connected to the upper end of the rear connecting rod 323, and the lower end of the rear connecting rod 323 is pivotally connected to the rear end of the transmission connecting rod 312.

[0055] The leg extension device 33 includes a first leg link 331, a second leg link 332, a footrest support plate 333, and a plurality of links pivotally connected therebetween. The rear ends of the first leg link 331 and the second leg link 332 are pivotally connected to the seat bracket 311, respectively.

[0056] Optionally, a linkage link 314 is further provided between the backrest assembly 22 and the leg extension device 33 , wherein one end of the linkage link 312 is pivotally connected to the second leg link 332 , and the other end is pivotally connected to the third end of the backrest connector 322 .

[0057] The seat unit also includes a linkage actuation mechanism 4 for shifting the seat unit between a sitting position, a TV position, and / or a reclining position. To install the linkage actuation mechanism 4, a front crossbar 34 is fixedly connected between the leg extension devices 33, for example, between the first leg links 331 in the embodiment shown in FIG. 2 , and a seat crossbar 35 is fixedly connected between the seat supports 311 via fixing tabs 315. In this embodiment, the linkage actuation mechanism 40 is configured as a linear motor unit and includes a motor head 41, a motor rail 42 connected to the motor head 41, and a motor slider 43 slidable relative to the motor rail 42. The motor head 41 is pivotally connected to the front crossbar 34, and the motor slider 43 is pivotally connected to the seat crossbar 35. Therefore, when the motor head 41 moves longitudinally back and forth along the motor guide rail 42 relative to the motor slider 43, the front crossbar 34 drives the leg extension device 33 to extend forward or retract backward through the first leg link 331, and further drives the backrest connector 322 to rotate through the linkage link 314, thereby causing the backrest bracket 321 to tilt backward or forward around its pivot point with the seat bracket 311. In this way, the seat unit can be transformed between a sitting position and a lying position.

[0058] According to the first embodiment shown in Figures 1 to 8, the swing structure 2 includes a swing base 21, a front swing rod 22, a rear swing rod 23, a swing actuator 25 and an eccentric transmission mechanism 26, and optionally, also includes a front swing rod cross beam 24 connected between the front swing rods 22.

[0059] The swing base plate 21 is fixedly connected to the fixed base of the base unit 1 with its bottom surface, and the swing base plate 21 is pivotally connected to the upper end of the front swing rod 22 with its top front end, and the swing base plate 21 is pivotally connected to the upper end of the rear swing rod 23 with its top rear end. The lower end of the front swing rod 22 and the lower end of the rear swing rod 23 are respectively pivotally connected to the longitudinally extending transmission connecting rod 312, so that the transmission connecting rod and the linkage structure 3 fixedly connected thereto are "suspended" on the swing base plate 21.

[0060] The swing actuator 25 comprises a swing electric drive 251 and a drive bracket 252 that is fixedly connected to the swing electric drive 251 relative to the fixed base position. In this embodiment, the swing electric drive 251 is configured as a belt-driven motor, but of course the swing electric drive 251 can also be configured as other types of motors.

[0061] The eccentric transmission mechanism 26 includes a crank 261 coupled to the oscillating electric drive 251, a transmission arm 262, and a connecting seat 263 coupled to the linkage structure 3. As shown in Figures 4 and 5, the crank 261 is coupled to the output shaft of the oscillating electric drive 251 with its crank proximal end 2611 in a torsionally fixed manner, so that the crank 261 can rotate about a rotation point 2611a under the drive of the oscillating electric drive 251. The crank distal end 2612 of the crank 261 is pivotally connected to the transmission arm proximal end 2621 of the transmission arm 262. A transmission arm ball head 2622 is configured at the transmission arm distal end opposite the transmission arm proximal end 2621 to form a universal joint device with a shape-matched ball head receptacle configured in the connecting seat 263.

[0062] In this embodiment, a rear crossbar 36 is further provided for mounting the rocking structure 2. The rear crossbar 36 is fixedly connected at both ends to the lower portion of the rear connecting member 323. The connecting seat 263 is fixedly connected to the rear crossbar 36. Accordingly, the transmission arm ball head 2622 is form-fittingly received in the ball head receiving portion of the connecting seat 263, and rotates about the transmission action point 2622a.

[0063] The crank 261 is rotated about a rotation point 2611a by the oscillating electric drive 251. Given the eccentric arrangement of the pivot point between the crank distal end 2612 and the transmission arm proximal end 2621 relative to the rotation point 2611a, the distance between the rotation point 2611a and the transmission action point 2622a changes as the crank 261 rotates. Thus, the eccentric transmission mechanism 26 is able to transmit the rocking actuation torque generated by the oscillating electric drive 251 to the rear connecting member 323 of the linkage structure 3. Under the action of the rocking actuation torque, the rear connecting member 323 tends to rock back and forth, with the rocking of the front and rear rocking arms 22 and 23 causing the linkage structure 3 to swing back and forth.

[0064] As shown in Figures 6 to 8, when the seat unit is in the neutral position shown in Figure 6, the seat unit has not yet swung. When the first electric actuator 251 rotates until the distance between the pivot point 2611a and the transmission action point 2622a is maximized, as shown in Figure 7, the seat unit reaches its first swung position, also known as the rearward swing limit position. When the crank 261 continues to rotate until the distance between the pivot point 2611a and the transmission action point 2622a is minimized, as shown in Figure 8, the seat unit reaches its second swung position, also known as the forward swing limit position. This causes the seat unit to alternate between the first and second swung positions.

[0065] Figure 9 shows a second embodiment of the present application. Unlike the first embodiment, the base unit 1 includes two base longitudinal beams 13 extending parallel to each other in the front-rear direction of the seat unit and a base cross beam 14 connected between the base longitudinal beams 13, thereby forming a fixed base directly supported on the ground.

[0066] Figures 10 and 11 schematically illustrate a third embodiment of the present application. The seat unit comprises a base unit 1, a rocking structure 2, and a linkage structure 3. For clarity, the linkage structure 3 on one side is omitted in Figure 10.

[0067] The base unit 1 includes two base longitudinal beams 13 extending parallel to each other in the front-to-rear direction of the seat unit, and a base cross beam 14 connected between the base longitudinal beams 13, thereby forming a fixed base supported directly on the ground. The rocking structure 2 is connected between the base unit 1 and the linkage structure 3. Unlike the second embodiment, the rocking structure 2 has a different configuration.

[0068] As shown in Figures 10 and 11, the rocking structure 2 includes a rocking base 27, the top surface of which is fixedly connected to the rocking mounting plate 37 of the linkage structure 3. The bottom surface of the rocking base 27 is arcuately configured and rockably supported on the top surface of the base longitudinal beam 13 of the fixed base. The rocking mounting plate 37 is fixedly connected to the transmission connecting rod 312, thereby allowing the linkage structure 3 to be rockably mounted on the fixed base relative to the base unit 1.

[0069] Similarly, the rocking structure 2 also includes a rocking actuator 25 and an eccentric transmission mechanism 26 (not shown in detail). The rocking actuator 25 includes an electric rocking drive 251 and a drive bracket 252. The eccentric transmission mechanism 26 includes a crank 261 coupled to the electric rocking drive 251, a transmission arm 262, and a connecting base 263 coupled to the linkage structure 3. The crank 261 is coupled to the output shaft of the electric rocking drive 251 at its proximal crank end 2611 in a torque-proof manner, allowing the crank 261 to rotate about a rotation point 2611a when driven by the electric rocking drive 251. The crank distal end 2612 of the crank 261 is pivotally connected to the proximal transmission arm end 2621 of the transmission arm 262. A transmission arm ball head 2622 is formed at the distal transmission arm end, opposite the proximal transmission arm end 2621, to form a universal joint with a shape-matched ball head receptacle formed in the connecting base 263.

[0070] In this embodiment, a rocking crossbar 38 is also provided for mounting the rocking structure 2. The rocking crossbar 38 is fixedly connected at both ends between the rocking mounting plates 37. The electric rocking actuator 251 (not shown) is fixedly mounted on a fixed base via an actuator bracket. A connecting base 263 (also not shown) is fixedly connected to the rocking crossbar 38. Accordingly, the transmission arm ball head 2622 is received in a form-fitting manner in the ball head receiving portion of the connecting base 263, allowing it to rotate about a transmission action point 2622a.

[0071] The crank 261 is rotated about a pivot point 2611a by the swing electric actuator 251. Because the pivot point between the crank distal end 2612 and the transmission arm proximal end 2621 is eccentrically positioned relative to the pivot point 2611a, the distance between the pivot point 2611a and the transmission action point 2622a changes as the crank 261 rotates. Consequently, the eccentric transmission mechanism 26 transmits the rocking actuation torque generated by the swing electric actuator 251 to the rocking crossbar 38 of the linkage structure 3, causing the rocking mounting plate 37 to rock back and forth on the fixed base via the curved bottom surface of the rocking base 27, thereby driving the linkage structure 3, which is fixedly mounted on the rocking mounting plate 37, to rock back and forth. When the first electric actuator 251 rotates until the distance between the pivot point 2611a and the transmission action point 2622a is maximized, the seat unit reaches its first rocking position. And when crank 261 continues to rotate to reach the minimum distance between rotation point 2611a and transmission action point 2622a, then reaches the second swinging posture of seat unit. Make seat unit alternately reciprocate between the first swinging posture and the second swinging posture thus.

[0072] Optionally, a damping device is further provided between the rocking crossbar 38 and the base crossbeam 14. In this embodiment, the damping device 28 is constructed as a spring member for cushioning excessive vibration caused by the forward and backward swinging of the linkage structure 3 to improve the comfort of the user.

[0073] The above description fully discloses the specific embodiments of this application. It should be noted that any changes made by those skilled in the art to the specific embodiments of this application do not depart from the scope of the claims of this application. Accordingly, the scope of the claims of this application is not limited to the aforementioned specific embodiments.

[0074] LIST OF REFERENCE NUMERALS 1 Base unit 11 Round base 12 Rotating support 13 Base longitudinal beam 14 Base transverse beam 2 Rocking structure 21 Rocking base plate 22 Front rocking arm 23 Rear rocking arm 24 Front rocking arm transverse beam 25 Rocking actuator 251 Rocking electric drive 252 Drive bracket 26 Eccentric transmission mechanism 261 Crank 2611 Crank proximal end 2612 Crank distal end 2611a Rotation point 262 Transmission arm 2621 Transmission arm proximal end 2622 Transmission arm ball head 2622a Transmission action point 263 Connecting seat 27 Rocking base 28 Damping device 3 Linkage structure 31 Seat assembly 311 Seat bracket 312 Transmission connecting rod 313 Fixed strut 314 Linkage connecting rod 315 Fixed tab 32 Backrest assembly 321 Backrest bracket 322 Backrest connecting piece 323 Rear connecting member 33 Leg extension device 331 First leg connecting rod 332 Second leg connecting rod 333 Footrest support plate 34 Front cross bar 35 Seat cross bar 36 Rear cross bar 37 Rocking mounting plate 38 Rocking cross bar 4 Linkage actuating mechanism 41Motor head 42 Motor slide rail 43 Motor slider.

Claims

1. A swing structure for a movable seat unit, the seat unit comprising a fixed base, two mirror-symmetrical and mutually parallel linkage structures, and a swing structure coupled between the fixed base and the linkage structures, wherein: The swing structure can make the linkage structure swing relative to the fixed base along the front-rear direction of the seat unit, wherein the swing structure includes: a swing actuating mechanism, which is fixedly disposed relative to the fixed base; An eccentric transmission mechanism comprises a crank and a transmission arm pivotally connected to each other, wherein the eccentric transmission mechanism is coupled to the rocking actuating mechanism by means of its crank, and is coupled to the linkage structure by means of its transmission arm, so as to transmit the rocking actuating torque generated by the rocking actuating mechanism to the linkage structure, and wherein the coupling between the transmission arm and the linkage structure is achieved by a universal joint device.

2. The swing structure according to claim 1, characterized in that: The crank is coupled to the rocking actuation mechanism at a rotation point, and the transmission arm is coupled to the linkage structure at a transmission action point.

3. The swing structure according to claim 2, characterized in that: The rocking structure enables the seat unit to alternately switch between a first rocking posture and a second rocking posture. In the first rocking posture, the distance between the rotation point and the transmission point is the largest, and in the second rocking posture, the distance between the rotation point and the transmission point is the smallest.

4. The swing structure according to claim 1, characterized in that: The transmission arm is coupled to a transverse rod that is directly or indirectly connected to the linkage structure.

5. The swing structure according to claim 4, characterized in that: The cardan shaft device comprises a drive arm ball head which is formed on the end of the drive arm and a ball head receptacle which is fixedly arranged on the transverse rod.

6. A movable seat unit, comprising: Fixed base; Swing structure; and Two mirror-symmetrical and mutually parallel linkage structures, the linkage structures comprising a seat support, a backrest assembly pivotally connected to the rear of the seat support, a leg extension device pivotally connected to the front of the seat support, and a transmission connecting rod fixedly connected to the seat support; The swing structure is coupled between the fixed base and the linkage structure, and can make the linkage structure swing relative to the fixed base along the front-rear direction of the seat unit. The pendulum structure includes: a swing actuating mechanism, which is fixedly disposed relative to the fixed base; An eccentric transmission mechanism comprises a crank and a transmission arm pivotally connected to each other, wherein the eccentric transmission mechanism is coupled to the rocking actuating mechanism by means of its crank, and is coupled to the linkage structure by means of its transmission arm, so as to transmit the rocking actuating torque generated by the rocking actuating mechanism to the linkage structure, and wherein the coupling between the transmission arm and the linkage structure is achieved by a universal joint device.

7. The seating unit according to claim 6, wherein: The crank is coupled to the rocking actuation mechanism at a rotation point, and the transmission arm is coupled to the linkage structure at a transmission action point.

8. The seating unit according to claim 7, wherein: The rocking structure enables the seat unit to alternately transform between a first rocking posture and a second rocking posture. In the first rocking posture, the distance between the rotation point and the transmission point is the largest, and in the second rocking posture, the distance between the rotation point and the transmission point is the smallest.

9. The seating unit according to claim 6, wherein: The transmission arm is coupled to a transverse rod that is directly or indirectly connected to the linkage structure.

10. The seating unit according to claim 9, wherein: The cardan shaft device comprises a drive arm ball head which is formed on the end of the drive arm and a ball head receptacle which is fixedly arranged on the transverse rod.

11. The seating unit of claim 9, wherein: The swing structure also includes a swing base fixedly connected to the fixed base, a front swing rod and a rear swing rod pivotally connected between the swing base and the linkage structure, wherein the front swing rod can be pivotally connected to the front end of the swing base by means of its upper end, and the rear swing rod can be pivotally connected to the rear end of the swing base by means of its upper end, and the lower end of the front swing rod and the lower end of the rear swing rod are pivotally connected to the transmission connecting rod respectively.

12. The seating unit of claim 11, wherein: The transverse bar is a rear transverse bar, wherein the rear transverse bar is fixedly connected to the backrest assembly at both ends thereof.

13. The seating unit of claim 12, wherein: The backrest assembly includes a backrest bracket, a backrest connecting member and a rear connecting member, wherein the backrest bracket is pivotally connected to the rear of the seat bracket with its front end, the rear end of the backrest bracket is pivotally connected to the upper end of the rear connecting rod through the backrest connecting member, the lower end of the rear connecting rod is pivotally connected to the transmission connecting rod, and the rear cross bar is fixedly connected to the rear connecting rod at both ends.

14. The seating unit of claim 9, wherein: The rocking structure also includes a rocking base, the top surface of which is fixedly connected to the rocking mounting plate of the linkage structure, and the bottom surface of which is arc-shaped and rockably supported on the fixed base, wherein the rocking mounting plate is fixedly connected to the transmission connecting rod.

15. The seating unit of claim 14, wherein: The transverse bar is a rocking cross bar, wherein the rocking cross bar is fixedly connected to the rocking mounting plate at both ends thereof.

16. The seating unit of claim 6, wherein: The fixed base includes two base longitudinal beams extending parallel to each other and a base transverse beam transversely connected between the base longitudinal beams.

17. The seating unit of claim 16, wherein: The fixed base is supported directly on the ground.

18. The seating unit of claim 16, wherein: The seat unit further comprises a rotating base, wherein the fixed base is rotatably connected above the rotating base, and the rotating base is directly supported on the ground with its bottom.

19. The seating unit of claim 6, wherein: The chair unit also includes a seat portion attached to the seat support, a footrest attached to the leg extension device and a backrest attached to the backrest assembly, wherein the linkage structure enables the chair unit to be transformed between a sitting position and a TV position and / or a lying position, in which the footrest is folded under the seat portion; in the TV position, the footrest is located in front of the seat portion, and the angle between the seat portion and the backrest remains basically the same as in the sitting position; in the lying position, the angle between the seat portion and the backrest is increased relative to that in the TV position.

20. The seating unit of claim 19, wherein: The seat unit further comprises a linkage actuating mechanism, which is used to drive the linkage structure so as to transform the seat unit between a sitting position and a TV position and / or a lying position.

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