Mechanical extension structure, seat unit, sofa, sofa control method, and electronic device

Abstract

A mechanical extension structure (1), comprising a base (11), a chassis (12), two backrest assemblies (13), two leg assemblies (14), a connecting structure (153) and a first driving device (15), the connecting structure (153) being fixedly connected to the two leg assemblies (14), and the connecting structure (153) comprising a swing plate (1531) rotatably connected to the first driving device (15). The mechanical extension structure (1) further comprises two sliding mechanisms (16), each of which comprises at least two guide members (161) and at least two tracks (162), wherein one of the guide member (161) and the corresponding track (162) is fixedly connected to the base (11), and the other is fixedly connected to the chassis (12); the guide member (161) is inserted into the track (162); at least a portion of the track (162) forms a clearance fit with the guide member (161); and during a transition of the mechanical extension structure (1) between a seated position and a reclined position, the guide member (161) is slidable along a first guide surface (16221) or a second guide surface (16222). Further provided are a seat unit, a sofa, a control method, and an electronic device. The problem that a seat unit cannot meet the requirements of both reliability and manufacturing costs is solved.

Description

Mechanical extension structure, seat unit, sofa, sofa control method and electronic equipment Technical Field

[0001] This application relates to a mechanical extension structure, a seat unit, a sofa, a sofa control method, and an electronic device. Background Technology

[0002] In the prior art, a seat unit includes a leg assembly, a base, a seat base, and at least one drive device, wherein the leg assembly is movably disposed on the base; the seat unit preferably has one or two drive devices, and the drive device is typically a motor, wherein:

[0003] When the seat unit includes a motor, rollers are installed on the base. One end of the motor is located on the leg assembly, and the other end is located on the base. After the motor drives the leg assembly to move, the leg assembly drives the base to move, so that the base rolls along the base via the rollers. The disadvantages of this solution are: 1. The rollers are prone to generating noise during the rolling process; 2. If foreign matter adheres to the roller surface, the rollers are prone to vibration during the rolling process; 3. If the roller surface has cracks or damage, the rollers are prone to eccentric rolling during the rolling process.

[0004] When the seat unit includes two motors, one end of the first motor is located on the leg assembly, and the other end is located on the base. The first motor drives the leg assembly to move relative to the base. One end of the second motor is located on the base, and the other end is located on the seat base. The second motor drives the base to slide relative to the seat base. The disadvantages of this solution are: the manufacturing cost of two motors is high, and each motor requires a separate on / off switch for control.

[0005] Therefore, existing seat units cannot balance reliability and manufacturing cost. Summary of the Invention

[0006] The technical problem to be solved by this application is to provide a mechanical extension structure, a seat unit, a sofa, a control method for the sofa, and an electronic device, so as to achieve both reliability and manufacturing cost of the seat unit.

[0007] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0008] The mechanical extension structure includes a base, a base, two sets of backrest assemblies, two sets of leg assemblies, a connecting structure, and a first drive device. The backrest assemblies are movably disposed behind the base, the leg assemblies are movably disposed in front of the base, and the connecting structure is fixedly connected to the two sets of leg assemblies. The connecting structure includes a swing plate that is rotatably connected to the first drive device.

[0009] The mechanical extension structure has a sitting position and a lying position. During the process of changing the mechanical extension structure from the sitting position to the lying position, the first drive device drives the base to move forward through the leg assembly, so that the leg assembly extends in front of the base and the backrest assembly tilts backward relative to the base. During the process of changing the mechanical extension structure from the lying position to the sitting position, the first drive device drives the base to move backward through the leg assembly, so that the leg assembly retracts under the base and the backrest assembly returns to its original position relative to the base.

[0010] The mechanical extension structure also includes two sets of sliding mechanisms. Each set of sliding mechanisms includes at least two guides and at least two rails. One of the guides and rails is fixedly connected to the base, and the other is fixedly connected to the base. The guides are inserted into the rails, and at least part of the rails are in clearance fit with the guides. During the process of changing between a sitting position and a lying position, the guides can slide along the first guide surface or the second guide surface.

[0011] In this application, the guide slides along a first or second guide surface. The advantages of sliding the guide along a track include: 1. The guide is fixedly connected to the base or seat, therefore, during the sliding process, movement noise is unlikely to occur between the guide and the base (or seat); 2. The surface of the guide (the surface in contact with the base) is shielded by the track, therefore, foreign objects are unlikely to actively fall onto its surface, meaning foreign objects are unlikely to adhere to the surface of the guide in contact with the base; 3. The guide's gravity is downward, and even after damage, the gravity of the guide remains downward. Therefore, regardless of whether the guide is damaged, its center of gravity will not shift during the sliding process. In other words, the "guide sliding" technology effectively overcomes problems such as rolling noise, foreign object adhesion, and eccentric rolling, thereby improving the user experience, especially during the operation of the seat unit (the seat unit's operation is the process of the base moving back and forth relative to the seat).

[0012] In this application, the mechanical extension structure includes a first drive unit that drives the base to slide along a track via a leg assembly. This structure reduces the manufacturing cost of the seat unit by "reducing the number of first drive units and reducing the number of on / off switches".

[0013] In this application, the driving force required for the movement of the leg assembly is significantly reduced by "at least part of the track and guide fitting with a clearance". After the driving force required for the movement of the leg assembly is reduced, the seat unit can adopt a single first drive device.

[0014] In this application, both reliability and manufacturing cost are balanced by using a method where "the guide slides along the first guide surface or the second guide surface" and "the seat unit adopts a mode with a single first drive device".

[0015] Preferably, when the mechanical extension structure is in a seated position, the track and the guide are in clearance fit; and / or, when the mechanical extension structure is in a reclining position, the track and the guide are in clearance fit.

[0016] When the mechanical extension structure is in a seated position with a clearance fit between the track and the guide, the initial driving force required for the leg assembly to extend can be significantly reduced. When the mechanical extension structure is in a reclining position with a clearance fit between the track and the guide, the initial driving force required for the leg assembly to retract can be significantly reduced.

[0017] Preferably, each sliding mechanism includes a first guide, a second guide, a first track, and a second track. When the mechanical extension structure is in a seated position, the first guide is inserted into the first track and the second guide is inserted into the second track, wherein at least a portion of the second track is located below the first track, and / or at least a portion of the second guide is located below the first guide.

[0018] Since at least part of the second guide is located below the first guide, the orientation of the front of the base can be adjusted when the mechanical extension structure is in a seated position. Preferably, the front of the base can be tilted slightly downward, which makes it convenient for both young and old users to get up from the seat.

[0019] Preferably, the two sets of sliding mechanisms are mirror images of each other on both sides of the base, and the base and / or the second track are provided with a first limiting structure to prevent the second guide from sliding outside the second track and separating from the second track; when the mechanical extension structure is in the seated position, the second guide abuts against the first limiting structure.

[0020] In this application, when the mechanical extension structure is in a seated position and the second guide abuts against the first limiting structure, the initial position of the first driving device is always determined, so as to reduce the probability of accumulated error of the first driving device.

[0021] Preferably, the second track is provided with a buffer pad, the hardness of which is less than that of the first limiting structure. When the mechanical extension structure is in a sitting position, the second guide does not abut against the buffer pad; when the mechanical extension structure is in a lying position, the second guide abuts against the buffer pad, and the buffer pad is located between the second guide and the first limiting structure.

[0022] The seat unit includes a backrest structure and a seat cushion structure. During the mechanical extension structure's transition from a sitting to a reclining position, the seat cushion structure continuously compresses the backrest structure. Therefore, when the mechanical extension structure is in the sitting position, even if the second guide impacts the first limiting structure, the user's perception will not be very noticeable. However, during the mechanical extension structure's transition from a reclining to a sitting position, the seat cushion structure moves away from the backrest structure. Therefore, when the mechanical extension structure is in the reclining position, the second guide impacts the first limiting structure through the cushioning pad, thus reducing the user's perception.

[0023] Preferably, the first track and the second track are inclined, and the angle between the first track and the horizontal plane is less than the angle between the second track and the horizontal plane;

[0024] The first and second tracks have the same tilt direction.

[0025] Currently, seat units are developing towards comfort and zero back rubbing. To achieve this goal, it is usually necessary to slow down the rate of increase in the vertical height difference between the front and rear of the base. "The angle between the first track and the horizontal plane is less than the angle between the second track and the horizontal plane, and the first track and the second track have the same tilt direction" can effectively improve the problem of the rapid increase in the vertical height difference during the movement of the base relative to the base.

[0026] Preferably, when the mechanical extension structure is in a seated position, the angle between the upper surface of the base and the horizontal plane is -10° to 12°. Elderly users of different ages can adjust the angle between the upper surface of the base and the horizontal plane according to their physical condition to reduce the difficulty of getting up.

[0027] Preferably, the guide element is in contact with the track surface. "The guide element is in contact with the track surface" is used to further increase the stability of the guide element during sliding and to increase the wear resistance of the guide element, thereby effectively extending the service life of a single guide element.

[0028] Preferably, the guide is fixedly connected to the base, and the guide is detachably mounted on the base. As a vulnerable component, the guide can be replaced by disassembly and assembly.

[0029] Preferably, the guide is threaded to the base, and / or, when the guide is fixedly connected to the base, an annular gasket is clamped between the guide and the base.

[0030] When the guide is threadedly connected to the base, it facilitates easy assembly and disassembly. When the guide is threadedly connected to the base and in contact with the track surface, the "surface contact between the guide and the track" prevents the guide from rotating relative to the base during sliding. To ensure the reliability of the threaded connection between the guide and the base, a clearance fit is used between the guide and the track.

[0031] The annular gasket in "the annular gasket sandwiched between the guide and the base" is used to increase the connection strength between the guide and the base.

[0032] Preferably, the guide has an arc surface that contacts the track, and the connecting force between the guide and the base is greater than the sliding friction force generated by the guide sliding along the track.

[0033] Preferably, when an annular gasket is held between the guide and the base, the radial width of the annular gasket is greater than the width of the guide;

[0034] During the transition of the mechanical extension structure from a seated position to a reclining position, the annular pad can slide along the track or base.

[0035] The radial width of the annular gasket is greater than the width of the guide, allowing the annular gasket to slide along the track or base. This structure effectively prevents the base from being scratched by the base or track. Since the base surface is usually coated, the coating increases the base's corrosion resistance and oxidation resistance. Therefore, the ability of the annular gasket to slide along the track or base effectively extends the service life of the base.

[0036] Preferably, the guide and the base are fixedly connected by at least two first fasteners. The two first fasteners increase the connection strength between the guide and the base and reduce the probability of the guide moving relative to the base, thereby improving the operational reliability of the mechanical extension structure.

[0037] Preferably, at least one first fastener can slide along the guide and / or base to change the spacing between two adjacent first fasteners. By changing the spacing between two adjacent first fasteners, the connection strength between the guide and the base is adjusted so that guides of different specifications can be adapted to bases of different specifications; that is, the versatility of the guide and base is increased.

[0038] Preferably, the guide includes a slide bar with a first tapered section whose diameter gradually decreases along the axial direction of the slide bar and can abut against the track; and / or, the track has a second tapered section that is inclined along the axial direction of the guide and can abut against the guide.

[0039] When the guide has a first tapered section and the track has a second tapered section, the first tapered section abuts against the second tapered section. The first and second tapered sections are used to increase the stability of the slide rod during sliding and to define the position of the base relative to the base in the axial direction of the slide rod.

[0040] The seat unit includes a backrest structure, a seat cushion structure, and a mechanical extension structure as described in any of the above technical solutions. The backrest assembly is located on the backrest structure, and the seat cushion structure is located above the base.

[0041] When the mechanical extension structure is in a seated position, the backrest assembly compresses the seat cushion structure, which then undergoes elastic deformation and indents inward.

[0042] When the mechanical extension structure is in the seated position and the backrest assembly is pressing against the seat cushion structure, the backrest assembly will prevent the user's hand from reaching between the backrest assembly and the base from top to bottom. This structure effectively reduces the probability of the user's hand being pinched by the seat unit.

[0043] Preferably, when the mechanical extension structure is in a reclining position, the backrest assembly compresses the seat cushion structure, and the seat cushion structure undergoes elastic deformation and then indents inward; or, when the mechanical extension structure is in a reclining position, there is a gap between the backrest assembly and the seat cushion structure.

[0044] When the mechanical extension structure is in a reclining position and the backrest assembly is pressing against the seat cushion structure, the backrest assembly can prevent the user's hand from reaching between the backrest assembly and the base from top to bottom in the reclining position; while when the mechanical extension structure is in a reclining position and there is a gap between the backrest assembly and the seat cushion structure, the gap can reduce the probability that the backrest assembly will puncture the seat cushion structure in the sitting position.

[0045] Preferably, the base includes four connecting rods, which are connected end to end to form a quadrilateral. At least one connecting rod includes a first angle iron, a second angle iron, and a mounting plate. The first angle iron includes a first horizontal plate and a first vertical plate. The second angle iron includes a second horizontal plate and a second vertical plate. The first horizontal plate is fixedly connected to the second vertical plate, and the second horizontal plate is fixedly connected to the first vertical plate.

[0046] The height of the first vertical plate is greater than the height of the second vertical plate. When the first horizontal plate is fixedly connected to the second vertical plate and the second horizontal plate is fixedly connected to the first vertical plate, the inner side of the first vertical plate and the outer side of the second vertical plate are fixedly connected to the mounting plate.

[0047] The mechanical extension structure also includes a first drive device, and the mounting plate is directly or indirectly rotatably connected to the first drive device.

[0048] When the inner side of the first vertical plate and the outer side of the second vertical plate are fixedly connected to the mounting plate, the deformation resistance of the connecting rod will be improved; and at least one connecting rod including the first angle iron and the second angle iron effectively improves the applicable scenarios of the connecting rod.

[0049] Preferably, the first driving device includes a first driver and a first driving rod disposed on the first driver. The first driver is rotatably connected to the rear of the base, and the first driving rod is rotatably connected to the swing plate.

[0050] The connecting structure also includes a connecting rod, which is rotatably connected to the base, and the swing plate and leg assembly are fixedly connected to the connecting rod respectively.

[0051] In the prior art, the mechanical extension structure is provided with two sets of leg components, which are connected by a connecting structure. The connecting structure is rotatably connected to the first drive rod on the first driver. However, the existing connecting structure is not rotatably connected to the base. That is to say, during the process of the leg components extending in front of the base (or the leg components retracting below the base), the connecting structure is suspended in the air throughout. At this time, the force required for the leg components to move relative to the base is directly provided by the connecting structure.

[0052] The leg assembly is fixedly connected to the connecting rod. During the transition between the sitting and lying positions, the first drive rod drives the connecting rod to rotate relative to the base via the swing plate, so that the connecting rod drives the leg assembly to extend in front of the base or retract below the base.

[0053] In this application, because the connecting rod is rotatably connected to the base, the base provides support for the connecting rod throughout the entire process of the leg assembly extending in front of the base (or retracting under the base). This means that during the process of the leg assembly extending in front of the base (or retracting under the base), the base can reduce at least part of the torque required for the connecting rod to drive the leg assembly. This structure is used to solve the vibration problem that may occur when the connecting rod drives the leg assembly.

[0054] Preferably, a bearing is provided between the connecting rod and the base; and / or, a lubricant is provided at the rotatable connection between the connecting rod and the base. Both the bearing and the lubricant are used to reduce the frictional resistance encountered by the connecting rod during rotation relative to the base.

[0055] Preferably, the base is provided with at least one support block, and at least one connecting rod is located below the support block, and the base can abut against the connecting rod through the support block; and / or, at least part of the support block is located between the side wall of the base and the side wall of the connecting rod.

[0056] After the base is impacted by an external force, the base can transfer part of the impact force to the connecting rod through the support block, thereby improving the base's resistance to deformation. If the connecting rod is located below the support block, it can absorb the impact force from above the base; if the connecting rod is located on the side wall of the base, it can absorb the impact force from the side of the base. This structure is used to reduce the deformation amplitude of the base after being impacted by an external force.

[0057] Preferably, the base has flanges on both sides, and the flanges and the base together form a receiving groove, with at least part of the support block located within the receiving groove. This structure ensures the base's resistance to deformation while reducing its thickness.

[0058] Preferably, the base has a hook on its front side and a hooking channel on its rear side. The mechanical extension structure also includes a seat cushion elastic element, with one end of the seat cushion elastic element located on the hook and the other end of the seat cushion elastic element located on the hooking channel.

[0059] The mounting channel is open at both ends and circumferentially closed, while the hook is open at both ends and circumferentially open. The circumferentially closed mounting channel can increase the deformation resistance of the rear of the base, especially since the mounting channel is located at the rear of the base, and the rear of the base is rotatably connected to the first actuator. When the mounting channel is set at the rear of the base, the hook is set at the front of the base to reduce the installation difficulty of the seat cushion elastic element.

[0060] Preferably, the backrest structure includes a backrest frame, a backrest filler, and a backrest decorative cover. The backrest filler is disposed on the backrest decorative cover, and the backrest decorative cover is disposed on the backrest frame. The front of the backrest filler has an inwardly recessed decorative groove, and the backrest decorative cover is detachably inserted into the decorative groove.

[0061] In the prior art, the backrest decorative cover uses stitching to create an inwardly recessed decorative seam on the front of the backrest structure. However, stitching increases the assembly time required for the backrest structure.

[0062] In this application, an inwardly recessed decorative groove is directly provided on the front of the backrest filling, and the backrest decorative cover is inserted into the decorative groove to directly form the decorative seam required for the backrest structure.

[0063] Preferably, the backrest decorative cover and the decorative groove are fixedly connected by Velcro, and the backrest decorative cover is detachably mounted on the backrest frame;

[0064] And / or, the decorative groove includes inclined groove walls, and the cross-sectional area of ​​the groove opening is less than the cross-sectional area of ​​the groove bottom.

[0065] When the backrest decorative cover and the decorative groove are fixedly connected by Velcro, and the backrest decorative cover is detachably installed on the backrest frame, the backrest decorative cover can be cleaned, removed, and installed without the need for other tools.

[0066] When the decorative groove includes inclined groove walls and the cross-sectional area of ​​the groove opening is less than the cross-sectional area of ​​the groove bottom, the connection strength between the backrest decorative cover and the decorative groove will be increased to prevent the backrest decorative cover from easily separating from the backrest filling due to friction on the user's back.

[0067] Preferably, the mechanical extension structure further includes two sets of swing mechanisms, with a set of leg components, a base and a base respectively movably connected to a set of swing mechanisms, and a support rod provided below the base;

[0068] When the mechanical extension structure is in a seated position, the distance between the lowest point of the swing mechanism and the lower end face of the support rod is ≥8cm; and / or, when the mechanical extension structure is in a reclining position, the distance between the lowest point of the swing mechanism and the lower end face of the support rod is ≥8cm.

[0069] Because "the first driver is rotatably connected to the rear of the base, and the first drive rod is rotatably connected to the swing plate," when a set of leg assemblies, the base, and the base are movably connected to a set of swing mechanisms, the leg assemblies can drive the base to slide relative to the base through the swing mechanisms. Of course, in this application, when the first driver is rotatably connected to the base, the swing mechanism is not required.

[0070] The height of a robotic vacuum cleaner is around 8cm. When the distance between the lowest point of the swing mechanism and the lower end of the support rod is ≥8cm, most robotic vacuum cleaners can directly enter under the seat unit.

[0071] Preferably, the swing mechanism includes a first link, a second link, and a third link. One end of the first link is rotatably connected to the base, and the other end of the first link is rotatably connected to one end of the second link. One end of the third link is rotatably connected to the leg assembly, and the other end of the third link is rotatably connected to the other end of the second link.

[0072] The eccentric position of the second link is rotatably connected to the base.

[0073] The eccentric position of the second link is rotatably connected to the base, which, in conjunction with the first drive device, is used to adjust the sliding speed of the base relative to the base; to match the adjustment speed of the seat unit for users of different ages, the adjustment speed being the speed at which the mechanical extension structure switches back and forth between the sitting and reclining positions.

[0074] Preferably, the base has a recessed groove from the outside in, and the leg assembly is rotatably connected to the base located in the groove by a second fastener;

[0075] At least part of the second fastener is located within the groove.

[0076] The groove is used to reduce the probability that the second fastener will collide with foreign objects during the transportation of the seat unit.

[0077] Preferably, a first elastic element is provided between the base and the base plate; and / or, a second elastic element is provided between the base and the leg assembly.

[0078] The first elastic element is used to increase the stability of the base during its movement relative to the base, and the second elastic element is used to increase the stability of the leg assembly during its movement relative to the base.

[0079] The sofa includes the seating unit described in any of the above technical solutions, with the seat cushion structure located on the base; wherein the track is detachably located on the base, or the track is integrated with the base.

[0080] The track can be detachably installed on the base to meet replacement requirements; or it can be integrated with the base to meet strength requirements.

[0081] Preferably, the first driving device includes a first driver, a first transmission mechanism and a first driving rod. The first driver is disposed on a base or a base, and a first output shaft is provided on the first driver. The first output shaft is connected to the first driving rod through the first transmission mechanism, and the first driving rod is rotatably connected to the swing plate.

[0082] The axis of the first output shaft coincides with the axis of the first drive rod. After the first driver drives the first output shaft to rotate, the first output shaft drives the first drive rod to move along its axis through the first transmission mechanism.

[0083] In the prior art, the first output shaft of the first driver is perpendicular to the first drive rod, which causes the first driver to be located on one side of the first drive rod, that is, the center of gravity of the first driver is not on the axis of the first drive rod.

[0084] In this application, since the axis of the first output shaft coincides with the axis of the first drive rod, the first driver and the first drive rod are located on the same straight line. This structure overcomes the problem of the first drive device driving the first drive rod to rotate axially under its own weight by overcoming the eccentric setting of the first drive device.

[0085] Preferably, the seat unit further includes a control switch, which includes two first switches and a switch base. The switch base is provided with two first common terminals, two first normally closed terminals and two first normally open terminals. Each first switch connects one of the first common terminals and one of the first normally closed terminals, or the first switch connects one of the first common terminals and one of the first normally open terminals.

[0086] In this configuration, one of the first common terminals is electrically connected to the positive terminal of the first driving device, and the other first common terminal is electrically connected to the negative terminal of the first driving device. Both first normally closed terminals are connected to the negative terminal of the power supply, and both first normally open terminals are connected to the positive terminal of the power supply. During the transition of the mechanical extension structure from a sitting to a lying position, one first switch connects one of the first common terminals to one of the first normally open terminals, and the other first switch connects the other first common terminal to the other first normally closed terminal. Similarly, during the transition of the mechanical extension structure from a lying to a sitting position, one first switch connects one of the first common terminals to one of the first normally closed terminals, and the other first switch connects the other first common terminal to the other first normally open terminal. This structure simplifies the circuit structure of the first driving device.

[0087] Preferably, the backrest structure includes a backrest frame, a headrest, and a second drive device. The headrest is movably disposed on the backrest frame, one end of the second drive device is disposed on the backrest frame, and the other end of the second drive device is movably disposed on the headrest, and is used to drive the headrest to move relative to the backrest frame.

[0088] The control switch also includes two second switches. The switch base is also provided with two second common terminals, two second normally closed terminals and two second normally open terminals. Each second switch connects one of the second common terminals and one of the second normally closed terminals, or the second switch connects one of the second common terminals and one of the second normally open terminals.

[0089] In this design, one of the second common terminals is electrically connected to the positive terminal of the second driving device, and the other second common terminal is electrically connected to the negative terminal of the second driving device. Both second normally closed terminals are connected to the negative terminal of the power supply, and both second normally open terminals are connected to the positive terminal of the power supply. During the process of the second driving device moving the headrest away from the backrest frame, one second switch connects one second common terminal to one second normally open terminal, and the other second switch connects the other second common terminal to the other second normally closed terminal. During the process of the second driving device moving the headrest closer to the backrest frame, one first switch connects one first common terminal to one first normally closed terminal, and the other first switch connects the other first common terminal to the other first normally open terminal. This structure simplifies the circuit structure of the second driving device, allowing the first and second switches to be integrated into a single switch socket.

[0090] Preferably, the backrest structure further includes a backrest filler and a backrest decorative cover. The backrest filler is disposed on the backrest decorative cover, and the backrest decorative cover is disposed on the backrest frame. The backrest filler is provided with an air guide channel. The air guide channel is provided with an air intake and at least one air outlet. The air guide channel is provided with a fan. The fan is provided with an air inlet and an air outlet. The gas passes through the air intake, air inlet, air outlet and air outlet in sequence in the air guide channel.

[0091] Wherein, the cross-sectional area of ​​at least one air outlet is less than the cross-sectional area of ​​the air guide channel located between the air outlet and the air outlet.

[0092] The requirement that "the cross-sectional area of ​​at least one air outlet is less than the cross-sectional area of ​​the air guide channel located between the air outlet and the air outlet" is used to increase the air velocity at the air outlet, while the air guide channel enables the ventilation function of the backrest structure.

[0093] When the backrest cover is made of cowhide, air vents are provided on the backrest cover to connect with the air outlet; when the backrest cover is made of technical fabric, the backrest cover can also be left without vents, allowing ventilation through the gaps in the technical fabric.

[0094] Preferably, the air outlet and the air vent are offset.

[0095] And / or, the air guide channel between the air outlet and the air vent has a bend. This structure is used to reduce the noise transmitted from the fan to the outside of the backrest structure during operation.

[0096] Preferably, a heater is installed in the air guide channel between the air outlet and the air vent, and the air discharged from the air outlet flows through the heater to the air vent. The heater enables the sofa to provide heat to the user in winter.

[0097] Preferably, the backrest structure includes a backrest filling and a backrest decorative cover. The backrest filling is disposed on the backrest decorative cover, and the backrest decorative cover is disposed on the backrest frame. The backrest filling is provided with an air guide channel. The air guide channel is provided with an air inlet and at least one air outlet. The air guide channel is provided with a fan. The fan is provided with an air inlet and an air outlet. The gas passes through the air inlet, air inlet, air outlet and air outlet in sequence in the air guide channel.

[0098] The backrest filling has at least one massage airbag connected to an air outlet. When gas enters the massage airbag without passing through the air outlet, the massage airbag does not protrude from the backrest filling. After the gas enters the massage airbag through the air outlet and deforms it, the massage airbag protrudes from the backrest filling. This structure enables the sofa to perform a massage function.

[0099] In addition to the massage airbags, eccentric wheels can also be installed on the backrest padding of the sofa to provide users with a massage function.

[0100] Preferably, the second driving device includes a second driver, a second transmission mechanism, and a second driving rod. The second driver is disposed on the backrest frame, and a second output shaft is provided on the second driver. The second output shaft is connected to the second driving rod through the second transmission mechanism, and the second driving rod is rotatably connected to the headrest.

[0101] The axis of the second output shaft coincides with the axis of the second drive rod. After the second driver drives the second output shaft to rotate, the second output shaft drives the second drive rod to move along its axis through the second transmission mechanism.

[0102] Preferably, the seat cushion structure includes a seat cushion filler and a seat cushion cover. The seat cushion cover has an opening through which the seat cushion filler is placed. The seat cushion cover has a sealing structure at the opening, which includes one of a straight zipper, an arc-shaped zipper, and a snap-on structure. This structure facilitates cleaning, disassembly, and installation of the seat cushion cover.

[0103] The sofa control method includes the sofa described in any of the above technical solutions, and the sofa further includes:

[0104] The control switch is electrically connected to the first drive unit;

[0105] The signal acquisition module is used to collect control signals;

[0106] The controller, control switch, and signal acquisition module are electrically connected through the controller;

[0107] Sofa control methods include:

[0108] The signal acquisition module transmits the acquired control signals to the controller. Based on the control signals, the controller controls the first drive device through a control switch, so that the first drive device adjusts the position of the base relative to the base.

[0109] This structure allows the base to be adjusted relative to the base using voice signals (or wireless signals, which can come from remote controls, mobile phones, iPads, computers, etc.).

[0110] Preferably, the control switch is connected to the second drive device, and the signal acquisition module transmits the acquired control signal to the controller. Based on the control signal, the controller controls the second drive device through the control switch so that the second drive device adjusts the position of the headrest relative to the backrest frame.

[0111] This structure allows for adjustment of the headrest's position relative to the backrest frame using voice or wireless signals.

[0112] Preferably, the signal acquisition module includes a voice acquisition module and / or an invalid signal receiving module.

[0113] Preferably, the control switch is connected to the fan, and the signal acquisition module transmits the acquired control signal to the controller. Based on the control signal, the controller controls the fan via the control switch to start or stop the fan. This structure enables the sofa's ventilation function to be controlled by voice or wireless signals.

[0114] Preferably, the control switch is connected to the ambient light, and the signal acquisition module transmits the acquired control signal to the controller. Based on the control signal, the controller controls the ambient light via the control switch to turn the ambient light on or off. This structure enables voice or wireless signal control of the sofa's ambient light, especially for illuminating the sofa at night.

[0115] The sofa control method includes the sofa described in any of the above technical solutions, and the sofa further includes:

[0116] The control switch is electrically connected to the first drive unit;

[0117] The first sensor is used to collect the first real-time electrical signal of the first driving device;

[0118] The controller, control switch and first sensor are electrically connected through the controller;

[0119] The controller presets a first reference electrical signal. When the first real-time electrical signal received by the controller is less than the first reference electrical signal, the controller controls the first drive device through the control switch so that the first drive device drives the leg assembly to move forward of the base.

[0120] This structure uses a first sensor to calibrate the position of the first drive unit in order to avoid the accumulation of errors in the first drive unit.

[0121] Preferably, when the mechanical extension structure is in a lying position, the first sensor acquires the limit electrical signal of the first drive device; when the mechanical extension structure is in the lying position again, the first sensor acquires a first real-time electrical signal. If the first real-time electrical signal received by the controller is not equal to the limit electrical signal, an alarm signal is output. This structure enables the first sensor to calibrate the limit position of the first drive device.

[0122] The sofa control method includes the sofa described in any of the above technical solutions, and the sofa further includes:

[0123] The control switch is electrically connected to the second drive unit.

[0124] The second sensor is used to collect the second real-time electrical signal of the second drive device;

[0125] The controller, control switch and second sensor are electrically connected through the controller;

[0126] The controller presets a second reference electrical signal. When the second real-time electrical signal received by the controller is less than the second reference electrical signal, the controller controls the second drive device through the control switch so that the second drive device drives the headrest to move away from the backrest frame.

[0127] This structure uses a second sensor to calibrate the position of the second drive unit in order to avoid the accumulation of errors in the second drive unit.

[0128] The sofa control method includes the sofa described in any of the above technical solutions, and the sofa further includes:

[0129] The control switch is electrically connected to the first drive unit;

[0130] The third sensor is used to collect the first real-time position signal of the first drive device;

[0131] The controller, control switch and third sensor are electrically connected through the controller;

[0132] Sofa control methods include:

[0133] The controller presets a first designated position signal. The third sensor transmits the first real-time position signal it collects to the controller. After comparing the first real-time position signal with the first designated position signal, the controller drives the first drive device through a control switch so that the first drive device adjusts the position of the base relative to the base.

[0134] In the prior art, various seat units are disclosed. The seat unit includes a backrest structure, a seat cushion structure, a leg rest structure, a mechanical extension structure, and a control switch. The mechanical extension structure has a sitting position and a reclining position. When the control switch controls the mechanical extension structure to change from a sitting position to a reclining position, the leg rest structure extends forward toward the seat cushion structure, and the backrest structure reclines backward. When the control switch controls the mechanical extension structure to change from a reclining position to a sitting position, the leg rest structure retracts downward toward the seat cushion structure, and the backrest structure returns to its original position.

[0135] However, existing mechanical extension structures require continuous button pressing to adjust the seat unit to the desired position; that is, mechanical extension structures cannot adjust to the user's desired position with a single button press.

[0136] In this application, the third sensor, in conjunction with the controller, enables the base to be adjusted to the user-preset position with a single click.

[0137] Preferably, the sofa further includes a fourth sensor, which is connected to the second drive device and is used to acquire the second real-time position signal of the second drive device;

[0138] The controller presets a second designated position signal, and the fourth sensor transmits the collected second real-time position signal to the controller. After comparing the second real-time position signal with the second designated position signal, the controller drives the second drive device through a control switch to adjust the position of the headrest relative to the backrest frame.

[0139] In this application, the fourth sensor, in conjunction with the controller, enables the headrest to be adjusted to the user's preset position with a single click.

[0140] Electronic devices include:

[0141] A memory and a processor, wherein the processor is used to run a program stored in the memory, wherein the program executes the sofa control method of any of the above-described technical solutions when it runs. Attached Figure Description

[0142] Figure 1 is a perspective view of the first type of mechanical extension structure in this application;

[0143] Figure 2 is a perspective view of the first structure of the sliding mechanism in this application;

[0144] Figure 3 is a front view of the seat unit in this application (the first mechanical extension structure is located in the sitting position);

[0145] Figure 4 is a front view of the first type of mechanical extension structure in this application (the mechanical extension structure is in a lying position);

[0146] Figure 5 is a perspective view of the second type of mechanical extension structure in this application;

[0147] Figure 6 is a front view of the second type of mechanical extension structure in this application (the mechanical extension structure is located in a seated position);

[0148] Figure 7 is a perspective view of the first type of mechanical extension structure in this application (the mechanical extension structure is located in a lying position);

[0149] Figure 8 is a cross-sectional view of the first structure of the sliding mechanism in this application;

[0150] Figure 9 is a cross-sectional view of the second structure of the sliding mechanism in this application;

[0151] Figure 10 is a cross-sectional view of the connecting rod, support block, and part of the base in this application;

[0152] Figure 11 is a cross-sectional view of the third structure of the sliding mechanism in this application;

[0153] Figure 12 is a structural schematic diagram of the backrest structure in this application;

[0154] Figure 13 is a schematic diagram of the structure of the first driving device, some control switches and external power supply in this application;

[0155] Figure 14 is a schematic diagram of the second drive device, some control switches and external power supply in this application;

[0156] Figure 15 is a schematic diagram of the circuit connection of the sofa in this application. Detailed Implementation

[0157] The present application will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0158] As shown in Figures 5 and 7, this application discloses a mechanical extension structure 1, including a base 11, a base 12, two sets of backrest assemblies 13, two sets of leg assemblies 14, a connecting structure 153, and a first driving device 15. The backrest assemblies 13 are movably disposed behind the base 11, and the leg assemblies 14 are movably disposed in front of the base 11. The connecting structure 153 is fixedly connected to the two sets of leg assemblies 14. The connecting structure 153 includes a swing plate 1531 that is rotatably connected to the first driving device 15.

[0159] The mechanical extension structure has a sitting position and a lying position, as shown in Figures 3 and 5. The mechanical extension structure 1 is in the sitting position; as shown in Figures 4 and 7, the mechanical extension structure 1 is in the lying position. During the process of changing the mechanical extension structure 1 from the sitting position to the lying position, the first drive device 15 drives the base 11 to move forward through the leg assembly 14, so that the leg assembly 14 extends in front of the base 11 and the backrest assembly 13 tilts backward relative to the base 11. During the process of changing the mechanical extension structure 1 from the lying position to the sitting position, the first drive device 15 drives the base 11 to move backward through the leg assembly 14, so that the leg assembly 14 retracts under the base 11 and the backrest assembly 13 returns to its original position relative to the base 11.

[0160] The mechanical extension structure 1 also includes two sets of sliding mechanisms 16. Each set of sliding mechanisms includes at least two guides 161 and at least two tracks 162. One of the guides 161 and the tracks 162 is fixedly connected to the base 11, and the other is fixedly connected to the base 12. The guides 161 are inserted into the tracks 162, and at least part of the tracks 162 are clearance-fitted with the guides 161. During the process of changing between a sitting position and a lying position, the guides 161 can slide along the first guide surface 16221 or the second guide surface 16222.

[0161] In this application, the mechanical extension structure 1 further includes a guide 161 and a track 162. The guide 161 is inserted into the track 162. During the transition between a sitting position and a lying position, the guide 161 slides along the first guide surface 16221 or the second guide surface 16222, thereby replacing the "roller rolling" technology in the prior art with the "guide sliding" technology. The advantages of the guide 161 sliding along the track 162 include: 1. The guide 161 is fixedly connected to the base 11 or the base 12, therefore, during the sliding process of the guide 161 along the track 162... 1. Movement noise is unlikely to be generated between the guide 161 and the base 11 (or the base 12); 2. The surface of the guide 161 (the surface of the guide 161 that contacts the base 11) is covered by the track 162, so foreign objects are unlikely to fall onto its surface, that is, foreign objects are unlikely to adhere to the surface of the guide 161 that contacts the base 11; 3. The gravity of the guide 161 is downward, and the gravity of the damaged guide 161 is still downward. Therefore, regardless of whether the guide 161 is damaged, its center of gravity will not shift during the sliding process of the guide 161 along the track 162. In other words, the "guide 161 sliding" technology effectively overcomes problems such as rolling noise, foreign object adhesion, and eccentric rolling, so as to improve the user experience, especially the user experience during the operation of the seat unit (the operation of the seat unit is the process of the base 11 moving back and forth relative to the base 12).

[0162] In this application, the mechanical extension structure includes a first drive unit 15, which drives the base 11 to slide along the track 162 via the leg assembly 14. This structure reduces the manufacturing cost of the seat unit by "reducing the number of first drive units and reducing the number of on / off switches".

[0163] In this application, the driving force required for the movement of the leg assembly 14 is significantly reduced by "at least a portion of the track 162 engaging with the guide 161 with a clearance fit". After the driving force required for the movement of the leg assembly 14 is reduced, the seat unit can adopt a single first drive unit 15.

[0164] In this application, reliability and manufacturing cost are balanced by "the guide 161 sliding along the first guide surface 16221 or the second guide surface 16222" and "the seat unit adopting a single first drive device 15".

[0165] Figure 5 shows the mechanical extension structure 1 in a seated position; Figure 7 shows the mechanical extension structure 1 in a reclining position; Figure 6 shows the position of the guide 161 on the track 162 when the mechanical extension structure 1 is in a seated position and when the mechanical extension structure 1 is in a reclining position. Therefore, two guides 161 are provided on one track 162. The left side of the track 162 shows the position of the guide 161 on the track 162 when the mechanical extension structure 1 is in a reclining position, and the right side of the track 162 shows the position of the guide 161 on the track 162 when the mechanical extension structure 1 is in a seated position.

[0166] As shown in Figure 6, when the mechanical extension structure 1 is in a seated position, the guide 161 is located at position P1 on the right side of the track 162; when the mechanical extension structure 1 is in a reclining position, the guide 161 is located at position P2 on the left side of the track 162.

[0167] The rotatable connection between the swing plate 1531 and the first drive rod 152 is the first transition point 30. When the mechanical extension structure 1 is in a seated position, the first transition point 30 is located at P3, as shown in Figures 1, 3, 5 and 6; when the mechanical extension structure 1 is in a reclining position, the first transition point 30 is located at P4, as shown in Figures 4 and 7; the straight-line distance between P1 and P2 is less than the straight-line distance between P3 and P4.

[0168] It is not difficult to conclude from the fact that “the straight-line distance between P1 and P2 is less than the straight-line distance between P3 and P4” that the length of the track 162 and the length of the swing plate 1531 determine the extension length of the leg assembly 14.

[0169] As shown in Figure 6, the track 162 is fixedly connected to the base 12. The track 1622 is provided with a sliding groove 1622. The guide 161 can be inserted into the sliding groove 1622. The sliding groove 1622 includes a first guide surface 16221 and a second guide surface 16222 corresponding to the first guide surface 16221. During the process of changing between the sitting position and the lying position, the guide 161 can slide along the first guide surface 16221 or the second guide surface 16222, so that the base 11 slides along the base 12.

[0170] In this application, each track segment 162 is provided with a first guide surface 16221 and a second guide surface 16222. Each guide member 161 is located between the first guide surface 16221 and the second guide surface 16222 of a track segment 162. At least a portion of the track 162 and the guide member 161 are in clearance fit. During the transition between a sitting position and a lying position, the guide member 161 can move along the first guide surface 16221 or the second guide surface 16222 of the mechanical extension structure 1. Based on the statement that "during the transition between a sitting position and a lying position, the guide member 161 can slide along the first guide surface 16221 or the second guide surface 16222 of the mechanical extension structure 1," it is easy to conclude that at least a portion of the guide member 161 is in clearance fit with the slide groove 1622, as shown in Figure 8. That is, during the transition between a sitting position and a lying position, the guide member 161 will not be in full interference fit with the track 162. This structure can effectively reduce the friction of the guide member 161 during its movement along the track 162.

[0171] Of course, the most preferred option is that the guide 161 does not have an interference fit with the track 162 throughout the entire process.

[0172] When the guide 161 is located at the arc transition between the inclined section and the straight section, and the guide 161 and the track 162 are in an interference fit, the arc transition between the inclined section and the straight section can physically forcefully change the movement trajectory of the guide 161 to prevent the guide 161 from separating from the track 162.

[0173] In this context, the horizontal plane is the front-to-back direction in Figure 2; the inclined segment uses either its centerline or its upper end face as the measurement reference to measure the angle between the inclined segment and the upper end face 113 of the base 11; the straight segment uses either its centerline or its upper end face as the measurement reference to measure the angle between the straight segment and the upper end face 113 of the base 11; and the first track 1601 uses either its centerline or its upper end face as the measurement reference to measure the angle between the first track 1601 and the upper end face 113 of the base 11.

[0174] In existing technologies, mechanical extension structures include guides, typically sliders, with a track on the base. The guide is inserted into the track and has an interference fit with it. During the transition between a sitting and reclining position, the guide slides along the track, allowing the base to move back and forth relative to the seat. While the interference fit between the guide and the track increases stability during this movement, it also increases friction during the guide's sliding motion. Increased friction along the track slows down the guide's movement, potentially negatively impacting the user experience of the seat unit.

[0175] As shown in Figure 5, at least two tracks 162 are respectively the first track 1601 and the second track 1602, and the first track 1601 and the second track 1602 are respectively provided on both sides of the base 11. In Figure 5, the first track 1601 is not connected to the second track 1602; however, in this application, the first track 1601 can also be connected to the second track 1602 according to actual needs.

[0176] Preferably, in this application, when the mechanical extension structure 1 is in a seated position, the track 162 and the guide 161 are in a clearance fit; when the mechanical extension structure 1 is in a reclining position, the track 162 and the guide 161 are in a clearance fit. When the mechanical extension structure 1 is in a seated position and the track 162 and the guide 161 are in a clearance fit, the initial driving force required for the leg assembly 14 to extend can be significantly reduced. When the mechanical extension structure 1 is in a reclining position and the track 162 and the guide 161 are in a clearance fit, the initial driving force required for the leg assembly 14 to retract can be significantly reduced.

[0177] However, this application does not exclude the choice between "when the mechanical extension structure 1 is in a seated position, the track 162 and the guide 161 are in clearance fit" and "when the mechanical extension structure 1 is in a reclining position, the track 162 and the guide 161 are in clearance fit".

[0178] In this application, each set of sliding mechanisms 16 includes a first guide, a second guide, a first track 1601, and a second track 1602; wherein, as shown in FIG5, the guide 161 located in the first track 1601 is the first guide, and the guide 161 located in the second track 1602 is the second guide; when the mechanical extension structure 1 is in a seated position, the first guide is inserted into the first track 1601 and the second guide is inserted into the second track 1602, wherein at least a portion of the second track 1602 is located below the first track 1601, and / or at least a portion of the second guide is located below the first guide.

[0179] As shown in Figure 6, "at least part of the second track 1602 is located below the first track 1601" means that the second track 1602 on the side closer to the first track 1601 is located below the first track 1601. It can also be seen in Figure 6 that at least part of the second guide is located below the first guide.

[0180] Since at least part of the second guide is located below the first guide, the orientation of the front of the base 11 can be adjusted when the mechanical extension structure 1 is in a seated position. Preferably, the front of the base 11 can be tilted slightly downward, which makes it convenient for young and old users to get up from the seat.

[0181] Preferably, the two sets of sliding mechanisms 16 are mirror images of each other on both sides of the base 11. The base 11 and / or the second track 1602 are provided with a first limiting structure 1621 for preventing the second guide from sliding outside the second track 1602 and separating from the second track 1602. When the mechanical extension structure 1 is in a seated position, the second guide abuts against the first limiting structure 1621.

[0182] In this application, when the mechanical extension structure 1 is in a seated position and the second guide abuts against the first limiting structure 1621, the initial position of the first driving device 15 is determined to reduce the probability of accumulated error of the first driving device 15.

[0183] Furthermore, in the prior art, to prevent the guide from sliding outside the track, the length of the track can be increased; however, in this application, a first limiting structure 1621 is provided on the second track 1602 (or the first limiting structure 1621 is provided on the base 11, or the first limiting structure 1621 is provided on the base 11 and the second track 1602). The first limiting structure 1621 is used to prevent the guide 161 from sliding outside the track 162 and separating from the track 162; that is, the first limiting structure 1621 uses a physical structure to prevent the guide 161 from derailing, thereby improving the reliability of the seat unit during operation.

[0184] In this application, a buffer pad is provided on the second track 1602. The hardness of the buffer pad is less than that of the first limiting structure. The buffer pad is preferably made of flexible materials such as sponge or foam board, which are common and easy to understand. Therefore, the buffer pad is not shown in the attached drawings. When the mechanical extension structure 1 is in a sitting position, the second guide does not abut against the buffer pad. When the mechanical extension structure 1 is in a lying position, the second guide abuts against the buffer pad, and the buffer pad is located between the second guide and the first limiting structure 1621.

[0185] As shown in Figures 6 and 7, a buffer pad is provided on the second track 1602 on the side away from the first track 1601, and the first limiting structure 1621 on the side away from the first track 1601 fits the buffer pad.

[0186] Preferably, the cushioning pad is detachably mounted on the second track 1602. This structure facilitates the replacement of the cushioning pad and prevents it from losing its elasticity and failing to provide cushioning.

[0187] This application discloses two mechanical extension structures 1, wherein Figures 1-4 disclose one type of mechanical extension structure, and Figures 5-7 disclose the other type of mechanical extension structure. That is, the guide 161 includes two structures, the first type of guide 161 is shown in Figure 2, and the second type of guide 161 is shown in Figure 5.

[0188] As shown in Figure 2, the first type of guide 161 includes a fixed rod 1611 and a sliding rod 1612. The fixed rod 1611 is fixedly connected to the base 11, and the track 162 is fixedly connected to the base 12. The fixed rod 1611 and the track 162 are slidably connected to the sliding rod 1612. During the process of changing between a sitting position and a lying position, the fixed rod 1611 slides along the track 162 through the sliding rod 1612. The sliding rod 1612 is provided with a limiting part 16121 that can be used to abut against the first limiting structure 1621. The hardness of the limiting part 16121 is different from the hardness of the first limiting structure 1621.

[0189] Preferably, the track 162 is made of metal, and the first limiting structure 1621 is a first limiting block extending inward from the track 162, as shown in Figure 2; the sliding rod 1612 is made of plastic, and there are two sliding rods 1612. Of course, the sliding rod in this application can be a single rod, and the limiting part of the sliding rod can be made of plastic.

[0190] In addition, the first limiting structure 1621 can be integrally formed with the track 162, as shown in Figure 6.

[0191] Since the hardness of the limiting part 16121 is different from that of the first limiting structure 1621, during the process of the limiting part 16121 abutting against the first limiting structure 1621, the limiting part 16121 is used to dissipate part of the impact force of the sliding rod 1612 hitting the first limiting structure 1621, so as to further improve the user's experience during the operation of the seat unit.

[0192] As shown in Figure 2, the fixed rod 1611 is provided with a second limiting structure 16111 to prevent the sliding rod 1612 from sliding outside the fixed rod 1611 and separating from the fixed rod 1611.

[0193] When the guide 161 includes a fixed rod 1611 and a sliding rod 1612, the sliding rod 1612 is used to increase the range of motion of the base 11 relative to the base 12; while the second limiting structure 16111 is used in conjunction with the first limiting structure 1621 to limit the maximum distance that the guide 161 can move relative to the track 162.

[0194] In this application, the hardness of the second limiting structure 16111 is different from that of the limiting part 16121. When the fixed rod 1611 and the track 162 are slidably connected to the sliding rod 1612, the limiting part 16121 can be clamped between the first limiting structure 1621 and the second limiting structure 16111.

[0195] When the limiting part 16121 is clamped between the first limiting structure 1621 and the second limiting structure 16111, it can be observed whether the guide 161 and the track 162 are assembled according to the specifications.

[0196] Since the hardness of the limiting part 16121 is different from that of the second limiting structure 16111, during the process of the limiting part 16121 abutting against the second limiting structure 16111, the limiting part 16121 is used to dissipate part of the impact force of the sliding rod 1612 hitting the second limiting structure 16111, so as to further improve the user's experience during the operation of the seat unit.

[0197] Preferably, the second limiting structure 16111 is a second limiting block formed by the downward extension of the fixing rod 1611.

[0198] The seat unit includes a backrest structure 100 and a seat cushion structure 200. During the process of the mechanical extension structure 1 changing from a sitting position to a reclining position, the seat cushion structure 200 continuously compresses the backrest structure 100, meaning that the seat cushion structure 200 and the backrest structure 100 partially overlap in the vertical direction. Therefore, when the mechanical extension structure 1 is in the sitting position, even if the second guide impacts the first limiting structure 1621, the user's perception will not be very obvious. However, during the process of the mechanical extension structure 1 changing from a reclining position to a sitting position, the seat cushion structure 200 moves away from the backrest structure 100. Therefore, when the mechanical extension structure 1 is in the reclining position, the second guide impacts the first limiting structure 1621 through the buffer pad, thereby reducing the user's perception.

[0199] As shown in Figures 5 and 6, the first track 1601 and the second track 1602 are set at an angle, and the angle between the first track 1601 and the horizontal plane is less than the angle between the second track 1602 and the horizontal plane.

[0200] The first track 1601 and the second track 1602 have the same tilt direction.

[0201] As shown in Figure 6, the "angle between the first track 1601 and the horizontal plane" is the angle between the first guide surface 16221 (or the second guide surface 16222) of the first track 1601 and the horizontal plane; similarly, the "angle between the second track 1602 and the horizontal plane" is the angle between the first guide surface 16221 (or the second guide surface 16222) of the second track 1602 and the horizontal plane.

[0202] Currently, seat units are developing towards comfort and zero back rubbing. To achieve this goal, it is usually necessary to slow down the rate of increase in the vertical height difference between the front and rear of the base 11. "The angle between the first track 1601 and the horizontal plane is less than the angle between the second track 1602 and the horizontal plane, and the tilt directions of the first track 1601 and the second track 1602 are the same" effectively improves the problem of the rapid increase in the vertical height difference during the movement of the base 11 relative to the base 12.

[0203] As shown in Figure 5, when the mechanical extension structure 1 is in a seated position, the angle between the upper end face 113 of the base 11 and the horizontal plane is -10°≤12°. Elderly users of different ages can adjust the angle between the upper end face 113 of the base 11 and the horizontal plane according to their physical condition to reduce the difficulty of getting up.

[0204] As shown in Figure 5, the second track 1602 includes an inclined section 168 and a straight section 169. The inclined section 168 and the straight section 169 are connected by an arc. When the mechanical extension structure 1 is in a seated position, 5° < the angle between the inclined section 168 and the upper end face 113 of the base 11 < 45°; when the mechanical extension structure 1 is in a reclining position, 3° ≤ the angle between the upper end face 113 of the base 11 and the horizontal plane < 10°.

[0205] Among them, the horizontal plane is the front-back direction of Figure 3 and the horizontal plane is the front-back direction of Figure 6; the inclined segment 168 uses one of its center line and upper end face as the measurement reference to realize the angle between the inclined segment 168 and the upper end face 113 of the base 11.

[0206] Extensive market research has shown that the most comfortable angle for a user to lie on the seat unit is when the angle between the upper surface 113 of the base 11 and the horizontal plane is less than 10° (3° ≤ 10°). Since the movement distance of the guide 161 is controlled by the swing plate 1531, in order to allow the base 11 to move to the most comfortable angle of the seat unit within the limited travel of the track 162, the track 162 of this application includes an inclined section 168. The inclined section 168 is set to a specific inclined angle (specific inclined angle: 5° < angle between the inclined section 168 and the upper surface 113 of the base 11 < 45°), so that the base 11 can move to the most comfortable angle of the seat unit within the limited travel of the track 162.

[0207] Preferably, 7cm < swing plate 1531 < 30cm, and during the transition between the sitting and reclining positions, the swing plate 1531 is positioned above the lower end face 121 of the base 12. This structure reduces the probability of the swing plate 1531 colliding with external objects during transportation, especially when the seat unit has removed the support rod 18.

[0208] The angle between the inclined segment 168 and the horizontal plane is greater than the angle between the straight segment 169 and the horizontal plane. This "angle between the inclined segment 168 and the horizontal plane is greater than the angle between the straight segment 169 and the horizontal plane" allows the user to experience a certain degree of weightlessness and zero gravity in the initial stage of changing from a sitting position to a lying position in the mechanical extension structure 1, so as to meet the user's need to quickly adjust the seat posture.

[0209] The guide 161 has an arc surface that contacts the track 162, as shown in Figure 6. The outer contour of the guide 161 is circular, and in this case, the guide 161 is in line contact with the track 162. Of course, the outer contour of the guide 161 can also be elliptical, or the outer contour of the guide 161 can consist of only a segment of an arc.

[0210] In this application, the guide 161 can also contact the surface of the track 162, that is, at least one sliding surface is provided on the guide 161, and the sliding surface abuts against the track 162. Of course, the outer contour of the guide 161 can also be polygonal. The "contact between the guide 161 and the surface of the track 162" is used to further increase the stability of the guide 161 during the sliding process and to increase the wear resistance of the guide 161, so as to effectively extend the service life of a single guide 161.

[0211] In this application, the guide 161 is fixedly connected to the base 11, and the guide 161 is detachably disposed on the base 11. As a vulnerable component, the guide 161 can be replaced by disassembly and assembly.

[0212] Preferably, the guide 161 is threadedly connected to the base 11, and / or, when the guide 161 is fixedly connected to the base 11, an annular gasket 1614 is clamped between the guide 161 and the base.

[0213] When the guide 161 is threadedly connected to the base 11, the guide 161 is easy to install and remove; when the guide 161 is threadedly connected to the base 11 and the guide 161 is in surface contact with the track 162, the "surface contact between the guide 161 and the track 162" is used to prevent the guide 161 from rotating relative to the base 11 during the sliding process.

[0214] When the guide 161 comes into contact with the track 162, in order to ensure the reliability of the threaded connection between the guide 161 and the base 11, the guide 161 and the track 162 are fitted with a clearance fit.

[0215] In this application, the guide 161 has an arc surface that contacts the track 162. The connecting force between the guide 161 and the base 11 is greater than the sliding friction generated during the sliding of the guide 161 along the track 162. When the guide 161 is threadedly connected to the base 11, the "connecting force between the guide 161 and the base 11" is the threaded connection force between the guide 161 and the base 11, that is, the threaded connection force between the guide 161 and the base 11 is greater than the sliding friction generated during the sliding of the guide 161 along the track 162. This structure prevents the guide 161 from rotating relative to the base 11 during the sliding of the guide 161 along the track 162; "rotation of the guide 161 relative to the base 11" would cause the guide 161 to separate from the base 11.

[0216] The annular gasket 1614 in "the annular gasket 1614 sandwiched between the guide 161 and the base 11" is used to further increase the connection strength between the guide 161 and the base 11.

[0217] As shown in Figure 8, the base 12 is provided with an installation port 120, and an extension ring 121 is provided around the installation port 120. The hardness of the track 162 is less than the hardness of the extension ring 121. The track 162 is inserted into the extension ring 121 through the installation port 120. When the track 162 is inserted into the extension ring 121, the track 162 penetrates the extension ring 121.

[0218] The extension ring 121 increases the contact area between the base 12 and the track 162, thereby improving the connection strength between the track 162 and the base 12. Furthermore, since the hardness of the track 162 is lower than that of the extension ring 121, the track 162 can deform during installation, reducing the difficulty of installing the track 162.

[0219] As shown in Figure 8, the guide 161 includes a slide rod 1613, the hardness of the annular gasket 1614 is less than the hardness of the extension ring 121, and the slide rod 1613 passes through the track 162 and the annular gasket 1614 in sequence and is fixedly connected to the base 11.

[0220] When the slide bar 1613 passes through the track 162 and the annular gasket 1614 in sequence and is fixedly connected to the base 11, the annular gasket 1614 can abut against the track 162.

[0221] The advantages of the annular gasket 1614 include: 1. The annular gasket 1614 increases the connection strength between the slide rod 1613 and the base 11; 2. When the slide rod 1613 passes through the track 162 and the annular gasket 1614 in sequence and is fixedly connected to the base 11, the annular gasket 1614 prevents the track 162 from directly contacting the base 11, thereby scratching the base 11; 3. The annular gasket 1614 has low replacement cost; 4. The annular gasket 1614 and the track 162 are plastic parts, which can reduce the assembly accuracy requirements of the base 11 and the base 12; even if the annular gasket 1614 and the track 162 are not plastic parts, since "the hardness of the track 162 is less than the hardness of the extension ring 121" and "the hardness of the annular gasket 1614 is less than the hardness of the extension ring 121", the annular gasket 1614 and the track 162 can still reduce the assembly accuracy requirements of the base 11 and the base 12.

[0222] Preferably, the slide rod 1613 is threadedly connected to the base 11; and / or, the outer periphery of the track 162 is provided with several outwardly protruding ribs, and the track 162 is inserted into the base 12. When the track 162 is inserted into the base 12, the track 162 abuts against the base 12 through the ribs. The threaded connection between the slide rod 1613 and the base 11 facilitates the disassembly and replacement of the slide rod 1613. The presence of several ribs on the outer periphery of the track 162 effectively solves the problem of the track 162 being unable to be properly assembled due to its varying material thickness.

[0223] More preferably, when the slide rod 1613 is threadedly connected to the base 11, the threaded connection between the slide rod 1613 and the base 11 is filled with adhesive; and / or, when the slide rod 1613 is threadedly connected to the base 11, the slide rod 1613 is in contact with the surface of the track 162.

[0224] The adhesive is used to further increase the connection strength between the slide rod 1613 and the base 11, preventing the slide rod 1613 from loosening after rotating relative to the base 11. The contact between the slide rod 1613 and the track 162 surface effectively prevents the slide rod 1613 from rotating relative to the base 11.

[0225] As shown in Figure 9, the base 12 is provided with an installation port 120, and an extension ring 121 is provided around the installation port 120. The hardness of the track 162 is less than the hardness of the extension ring 121. The track 162 is inserted into the extension ring 121 through the installation port 120. When the track 162 is inserted into the extension ring 121, the track 162 does not penetrate the extension ring 121.

[0226] Since the track 162 does not pass through the extension ring 121, the extension ring 121 located within the track 162 will not collide with the base 11; that is, during the back-and-forth movement of the base 11, this structure effectively reduces the probability of the base 11 colliding with the track 162, thereby reducing the probability of the track 162 being displaced relative to the base 12.

[0227] As shown in Figure 9, the guide 161 includes a slide rod 1613 and an annular gasket 1614. The hardness of the annular gasket 1614 is less than the hardness of the extension ring 121. The slide rod 1613 passes through the track 162 and the annular gasket 1614 in sequence and is then fixedly connected to the base 11.

[0228] When the slide bar 1613 passes through the track 162 and the annular gasket 1614 in sequence and is fixedly connected to the base 11, the annular gasket 1614 can abut against the extension ring 121.

[0229] The annular gasket 1614 is used to protect the base 11 and prevent the base 11 from being scratched by the extension ring 121.

[0230] Preferably, the slide rod 1613 is threadedly connected to the base 11; and / or, the outer periphery of the track 162 is provided with a plurality of outwardly protruding ribs, the track 162 is inserted into the base 12, and when the track 162 is inserted into the base 12, the track 162 abuts against the base 12 through the ribs.

[0231] Preferably, in this application, the track 162 is snap-fitted to the base 12; and / or, the track 162 is connected to the base 12 by a third fastener, which can be one of a screw, bolt, or pin. This structure facilitates the assembly and disassembly of the track.

[0232] Of course, the first and second fasteners can also be one of screws, bolts, or pins.

[0233] In this application, when the annular gasket 1614 is held between the guide 161 and the base 11, the radial width of the annular gasket 1614 is greater than the width of the guide 161; during the process of the mechanical extension structure 1 changing from a sitting position to a lying position, the annular gasket 1614 can slide along the track 162 or the base 12.

[0234] "Radial width of annular gasket 1614" refers to the vertical length of annular gasket 1614, and "width of guide 161" refers to the vertical length of guide 161. As shown in Figures 8, 9 and 12, the vertical length of annular gasket 1614 is greater than the vertical length of guide 161.

[0235] The radial width of the annular gasket 1614 is greater than the width of the guide 161, allowing the annular gasket 1614 to slide along the track 162 or the base 12. This structure effectively prevents the base from being scratched by the base or track. Since the base surface is usually coated, the coating increases the base's corrosion resistance and oxidation resistance. Therefore, the ability of the annular gasket to slide along the track or base effectively improves the service life of the base.

[0236] In this application, one connection method for the guide 161 in the description of "guide 161 being fixedly connected to base 11 and detachably disposed on base 11" is: the guide 161 and base 11 are threadedly connected. Another connection method for the guide 161 in the description of "guide 161 being fixedly connected to base 11 and detachably disposed on base 11" is: the guide 161 and base 11 are fixedly connected by at least two first fasteners. The two first fasteners further increase the connection strength between the guide 161 and base 11 and reduce the probability of movement of the guide 161 relative to base 11, thereby improving the operational reliability of the mechanical extension structure 1.

[0237] When the guide 161 and the base 11 are fixedly connected by at least two first fasteners, at least one first fastener can slide along the guide 161 and / or the base 11 to change the spacing between two adjacent first fasteners. To allow the first fastener to slide along the guide 161, a horizontal guide groove is provided on the guide 161; to allow the first fastener to slide along the base 11, a horizontal guide groove is provided on the base 11. By changing the spacing between two adjacent first fasteners, the connection strength between the guide 161 and the base 11 is adjusted, so that guides 161 of different specifications can be adapted to bases 11 of different specifications; that is, the versatility of the guide 161 and the base 11 is increased.

[0238] In this application, the outer contour of the guide 161 can be circular or conical; when the outer contour of the guide 161 is conical, the guide 161 includes a slide rod, the slide rod has a first tapered section, the diameter of the first tapered section gradually decreases along the axial direction of the slide rod, and the first tapered section can abut against the track 162; and / or, the track 162 has a second tapered section, the second tapered section is inclined along the axial direction of the guide 161, and the second tapered section can abut against the guide 161;

[0239] When the guide 161 has a first tapered section and the track 162 has a second tapered section, the first tapered section abuts against the second tapered section. The first tapered section and the second tapered section are used to increase the stability of the slide bar during the sliding process and to limit the position of the base 11 relative to the base 12 in the axial direction of the slide bar.

[0240] The seat unit includes a backrest structure 100, a seat cushion structure 200, and the mechanical extension structure 1 described in this embodiment. The backrest assembly 13 is disposed on the backrest structure 100, and the seat cushion structure 200 is disposed above the base 11.

[0241] When the mechanical extension structure 1 is in a seated position, the backrest assembly 13 compresses the seat cushion structure 200, which undergoes elastic deformation and then indents inward.

[0242] When the mechanical extension structure 1 is in a seated position and the backrest assembly 13 presses against the seat cushion structure 200, the backrest assembly 13 will prevent the user's hand from reaching between the backrest assembly 13 and the base 11 from top to bottom. This structure effectively reduces the probability of the user's hand being pinched by the seat unit.

[0243] In this application, when the mechanical extension structure 1 is in a reclining position, the backrest assembly 13 presses against the seat cushion structure 200, and the seat cushion structure 200 undergoes elastic deformation and then indents inward; or, when the mechanical extension structure 1 is in a reclining position, there is a gap between the backrest assembly 13 and the seat cushion structure 200.

[0244] When the mechanical extension structure 1 is in a reclining position and the backrest assembly 13 presses against the seat cushion structure 200, the backrest assembly 13 can prevent the user's hand from reaching between the backrest assembly 13 and the base 11 from top to bottom in the reclining position; and when the mechanical extension structure 1 is in a reclining position and there is a gap between the backrest assembly 13 and the seat cushion structure 200, the gap can reduce the probability that the backrest assembly 13 will puncture the seat cushion structure 200 in the sitting position.

[0245] Preferably, when the mechanical extension structure 1 is in a seated position, the backrest front support 132 and the seat cushion structure 200 are in a clearance fit; and / or, when the mechanical extension structure 1 is in a reclining position, the backrest front support 132 and the seat cushion structure 200 are in a clearance fit. This structure prevents the backrest front support 132 from scratching the seat cushion decorative cover (which may be made of leather or technical fabric) on the seat cushion structure 200. When one end of the linkage support 134 is rotatably connected to the side wall of the base 11, and the backrest front support 132 and the seat cushion structure 200 are in a clearance fit, the linkage support 134 blocks the backrest front support 132, as shown in Figures 4 and 7. Therefore, unless the user intentionally inserts their hand between the linkage support 134 and the backrest front support 132, their hand will not be trapped between the backrest front support 132 and the base 11.

[0246] This application includes two types of seat cushion structures 200: 1. A seat cushion structure 200 includes a seat cushion elastic element, a seat cushion filler, and a seat cushion decorative cover. The seat cushion filler is disposed inside the seat cushion decorative cover, and the seat cushion decorative cover is disposed on a base 11. The seat cushion elastic element is disposed on the base 11 to provide elastic support for the seat cushion decorative cover. 2. A seat cushion structure 200 includes a seat cushion frame, a seat cushion elastic element, a seat cushion filler, and a seat cushion decorative cover. The seat cushion filler is disposed inside the seat cushion decorative cover, and the seat cushion decorative cover is disposed on the seat cushion frame, which is disposed on the base 11. The seat cushion elastic element is disposed on the seat cushion frame to provide elastic support for the seat cushion decorative cover.

[0247] Preferably, the seat cushion decorative cover is provided with a second sealing structure, and the second sealing structure is provided with a second zipper. The second zipper is used to open or close the second sealing structure. After the second zipper opens the second sealing structure, the seat cushion filling can enter the seat cushion decorative cover from the second sealing structure.

[0248] Preferably, when the seat cushion decorative cover is located on the base 11, the seat cushion decorative cover is hung on the base 11; when the seat cushion decorative cover is located on the seat cushion frame, the seat cushion decorative cover is hung on the seat cushion frame.

[0249] Preferably, the base 11 includes four connecting rods, which are connected end to end to form a quadrilateral. At least one connecting rod includes a first angle iron, a second angle iron, and a mounting plate. The first angle iron and the second angle iron are L-shaped. The first angle iron includes a first horizontal plate and a first vertical plate. The second angle iron includes a second horizontal plate and a second vertical plate. The first horizontal plate is fixedly connected to the second vertical plate, and the second horizontal plate is fixedly connected to the first vertical plate.

[0250] The height of the first vertical plate is greater than the height of the second vertical plate. When the first horizontal plate is fixedly connected to the second vertical plate and the second horizontal plate is fixedly connected to the first vertical plate, the inner side of the first vertical plate and the outer side of the second vertical plate are fixedly connected to the mounting plate.

[0251] The mechanical extension structure also includes a first drive device 15, and the mounting plate is directly or indirectly rotatably connected to the first drive device 15.

[0252] When the inner side of the first vertical plate and the outer side of the second vertical plate are fixedly connected to the mounting plate, the deformation resistance of the connecting rod will be improved; and at least one connecting rod including the first angle iron and the second angle iron effectively improves the applicable scenarios of the connecting rod.

[0253] As shown in Figures 5 and 7, the first driving device 15 includes a first driver 151 and a first driving rod 152 disposed on the first driver 151. The first driver 151 is rotatably connected to the rear of the base 11, and the first driving rod 152 is rotatably connected to the swing plate 1531.

[0254] The connecting structure 153 also includes a connecting rod, which is rotatably connected to the base 11. The swing plate 1531 and the leg assembly 14 are respectively fixedly connected to the connecting rod 153.

[0255] As shown in Figures 1 and 5, the first driving device 15 is movably disposed on the base 11; of course, the first driving device 15 of this application can also be movably disposed on the base 12.

[0256] As shown in Figures 1 and 5, the first driving device 15 includes:

[0257] The first driver 151 is movably disposed on the base 11 or the base 12;

[0258] The first drive rod 152 is movably mounted on the first driver 151;

[0259] The connecting structure 153 is fixedly connected to the leg assembly 14 and rotatably connected to the base 11. The connecting structure 153 includes a swing plate 1531 rotatably connected to the first drive rod 152. During the process of the mechanical extension structure 1 changing between a sitting position and a lying position, the first drive rod 152 drives the connecting structure 153 to rotate relative to the base 11 through the swing plate 1531.

[0260] In the prior art, the mechanical extension structure is provided with two sets of leg components, which are connected by a connecting structure. The connecting structure is rotatably connected to the first drive rod on the first driver. However, the existing connecting structure is not rotatably connected to the base. That is to say, during the process of the leg components extending in front of the base (or the leg components retracting below the base), the connecting structure is suspended in the air throughout. At this time, the force required for the leg components to move relative to the base is directly provided by the connecting structure.

[0261] The connecting structure 153 is fixed to the leg assembly 14 (i.e., the leg assembly 14 is fixedly connected to the connecting rod). During the process of the mechanical extension structure 1 changing between the sitting position and the lying position, the first drive rod 152 drives the connecting structure 153 to rotate relative to the base 11 through the swing plate 1531, so that the connecting structure 153 drives the leg assembly 14 to extend in front of the base 11 or retract below the base 11.

[0262] In this application, since the connecting mechanism 153 is rotatably connected to the base 11, the base 11 provides support for the connecting mechanism 153 throughout the process of the leg assembly 14 extending in front of the base 11 (or the leg assembly 14 retracting below the base 11). This means that during the process of the leg assembly 14 extending in front of the base 11 (or the leg assembly 14 retracting below the base 11), the base 11 can reduce at least part of the torque required for the connecting mechanism 153 to drive the leg assembly 14.

[0263] As shown in Figures 1 and 5, the first driving device 15 is located at an eccentric position on the base 11. The structure of "the connecting mechanism 153 being rotatably connected to the base 11" provides an eccentric basis for "the first driving rod being located at an eccentric position on the connecting structure".

[0264] In the prior art, the first drive rod of the seat unit is located in the middle of the base; a serpentine spring is provided on the base to support the seat cushion structure, and at least part of the seat cushion structure is provided above the serpentine spring. When a user sits on the seat cushion structure, the seat cushion structure transfers the user's weight to the serpentine spring, causing the serpentine spring to elastically deform. However, users have found that when the first drive rod of the seat unit is located in the middle of the base, the elastically deformed serpentine spring may come into contact with the first drive rod. Therefore, this application places the first drive device 15 at an eccentric position on the base 11 to further reduce the probability of the serpentine spring contacting the first drive rod 152.

[0265] In this application, since the connecting rod is rotatably connected to the base 11, the base 11 provides support for the connecting rod throughout the entire process of the leg assembly 14 extending in front of the base 11 (or retracting below the base 11). This means that during the process of the leg assembly 14 extending in front of the base 11 (or retracting below the base 11), the base 11 can reduce at least part of the torque required for the connecting rod to drive the leg assembly 14. This structure is used to solve the problem of vibration that may occur when the connecting rod drives the leg assembly 14.

[0266] Preferably, a bearing is provided between the connecting rod and the base 11; and / or, a lubricant is provided at the rotatable connection between the connecting rod and the base 11. Both the bearing and the lubricant are used to reduce the frictional resistance encountered by the connecting rod during its rotation relative to the base 11.

[0267] As shown in Figure 10, the base 11 is provided with at least one support block 114, and at least one connecting rod is located below the support block 114. The base 11 can abut against the connecting rod through the support block 114; and / or, at least part of the support block 114 is located between the side wall of the base 11 and the side wall of the connecting rod 153.

[0268] After the base 11 is impacted by an external force, the base 11 can transfer part of the impact force to the connecting rod through the support block 114, thereby improving the deformation resistance of the base 11. If the connecting rod is located below the support block 114, it can absorb the impact force from above the base 11. If the connecting rod is located on the side wall of the base 11, it can absorb the impact force from the side of the base 11. This structure is used to reduce the deformation amplitude of the base 11 after being impacted by an external force.

[0269] In this application, the connecting structure 153 may include a connecting rod, and the two sets of leg assemblies 14 are connected by the connecting rod, as shown in Figures 1 and 7; in this application, the connecting structure 153 may also include two connecting rods, each connecting rod connecting a set of leg assemblies 14, and each connecting rod being fixedly connected to the swing plate 1531.

[0270] In this application, the hardness of the support block 114 is less than the hardness of the base 11, the hardness of the support block 114 is less than the hardness of the connecting rod, and the distance between the support block 114 and the connecting rod is less than the vertical length of the connecting rod. Since the connecting rod in this application is circular, the vertical length of the connecting rod is the diameter of the connecting rod.

[0271] Preferably, the base 11 is made of metal, the support block 114 is made of plastic, and the connecting rod is made of metal.

[0272] When the hardness of the support block 114 is less than the hardness of the base 11, and when the hardness of the support block 114 is less than the hardness of the connecting rod, the support block 114 can absorb part of the impact force from external objects through its own deformation, thereby further reducing the deformation amplitude of the base 11 after being impacted by external forces. When the hardness of the support block 114 is less than the hardness of the base 11, and when the hardness of the support block 114 is less than the hardness of the connecting rod, after being impacted by external forces, the deformation of the support block 114 precedes the deformation of the connecting rod, and the deformation of the support block 114 precedes the deformation of the base 11.

[0273] As shown in Figure 10, the connecting rod is a circular connecting rod, and the support block 114 has an arc-shaped groove corresponding to the connecting rod, with at least part of the connecting rod inserted into the arc-shaped groove. The arc-shaped groove is used to define the position of the connecting rod on the support block 114 and to increase the contact area between the connecting rod and the support block 114; this structure prevents the support block 114 from sliding along the connecting rod and separating from the connecting rod after the base 11 is impacted by external force; that is, it ensures the reliability of the operation of the support block 114.

[0274] As shown in Figure 10, the base 11 has flanges 116 on both sides, and the flanges 116 on both sides and the base 11 form a receiving groove 117, with at least part of the support block 114 located in the receiving groove 117. This structure ensures the deformation resistance of the base 11 while reducing its thickness.

[0275] As shown in Figure 7, a hook 112 is provided on the front side of the base 11 and another hook 112 is provided on the rear side of the base 11. However, in this application, it is preferred that the hook 112 is provided on the front side of the base 11 and a hooking channel is provided on the rear side of the base 11. The mechanical extension structure 1 also includes a seat cushion elastic member, one end of which is provided on the hook 112 and the other end of which is provided on the hooking channel.

[0276] The mounting channel is open at both ends and circumferentially closed, while the hook 112 is open at both ends and circumferentially open. The circumferentially closed mounting channel can increase the deformation resistance of the rear of the base 11, especially since the mounting channel is located at the rear of the base 11, and the rear of the base 11 is rotatably connected to the first driver 151. When the mounting channel is set at the rear of the base 11, in order to reduce the installation difficulty of the seat cushion elastic element, the hook 112 is set at the front of the base 11.

[0277] In this application, the backrest structure 100 includes a backrest frame 1001, a backrest filler 1004, and a backrest decorative cover 1005. The backrest filler 1004 is disposed on the backrest decorative cover 1005, and the backrest decorative cover 1005 is disposed on the backrest frame 1001. The front of the backrest filler 1004 is provided with an inwardly recessed decorative groove, and the backrest decorative cover 1005 is detachably inserted into the decorative groove.

[0278] In the prior art, the backrest decorative cover uses stitching to create an inwardly recessed decorative seam on the front of the backrest structure. However, stitching increases the assembly time required for the backrest structure.

[0279] In this application, an inwardly recessed decorative groove is directly provided on the front of the backrest filling 1004, and the backrest decorative cover 1005 is inserted into the decorative groove, thus directly forming the decorative seam required for the backrest structure 100.

[0280] Preferably, in this application, the backrest decorative cover 1005 and the decorative groove are fixedly connected by Velcro. The Velcro includes two parts: a hook and a loop. The loop is glued to the hook so that the backrest decorative cover 1005 can be detachably mounted on the backrest frame.

[0281] And / or, the decorative groove includes inclined groove walls, and the cross-sectional area of ​​the groove opening is less than the cross-sectional area of ​​the groove bottom.

[0282] When the backrest decorative cover 1005 is fixedly connected to the decorative groove by Velcro, and the backrest decorative cover 1005 is detachably mounted on the backrest frame 1001, the backrest decorative cover 1005 can be cleaned, disassembled, and installed without the aid of other tools.

[0283] When the decorative groove includes an inclined groove wall and the cross-sectional area of ​​the groove opening is less than the cross-sectional area of ​​the groove bottom, the connection strength between the backrest decorative cover 1005 and the decorative groove will be increased to prevent the backrest decorative cover 1005 from easily separating from the backrest filling 1004 under the friction of the user's back.

[0284] In this application, the backrest structure 100 also includes a backrest elastic member, which is disposed on the backrest frame 1001 and is used to provide elastic support for the backrest decorative cover 1005.

[0285] Preferably, the backrest cover 1005 has a second sealing structure with a second zipper. The second zipper is used to open or close the second sealing structure. After the second zipper opens the second sealing structure, the backrest filling can enter the backrest cover through the second sealing structure. This structure, combined with Velcro, allows the backrest filling to be removed from the backrest cover without the need for any tools.

[0286] In this application, four preferred structures for the backrest assembly are:

[0287] The first type of backrest assembly includes a backrest panel, a front backrest bracket, a rear backrest bracket, and a backrest drive rod. The backrest panel is located on the backrest structure. One end of the front backrest bracket is rotatably connected to the backrest panel, and the other end of the front backrest bracket is rotatably connected to the base. One end of the rear backrest bracket is rotatably connected to the backrest panel, and the rear backrest bracket is rotatably connected to the base. One end of the backrest drive rod is rotatably connected to the other end of the rear backrest bracket, and the other end of the backrest drive rod is rotatably connected to the base.

[0288] The second structure includes a backrest panel, a front backrest bracket, a rear backrest bracket, and a backrest drive rod. The backrest panel is located on the backrest structure. One end of the front backrest bracket is rotatably connected to the backrest panel, and the other end of the front backrest bracket is fixedly connected to the base. One end of the rear backrest bracket is rotatably connected to the backrest panel, and the rear backrest bracket is rotatably connected to the base. One end of the backrest drive rod is rotatably connected to the other end of the rear backrest bracket, and the other end of the backrest drive rod is rotatably connected to the base.

[0289] The third type of backrest assembly includes a backrest panel, a front backrest bracket, a rear backrest bracket, a backrest connecting bracket, and a backrest drive rod. The backrest panel is located on the backrest structure. One end of the front backrest bracket is rotatably connected to the backrest panel, and the other end of the front backrest bracket is rotatably connected to the base. One end of the rear backrest bracket is rotatably connected to the backrest panel, and the other end of the rear backrest bracket is rotatably connected to one end of the backrest connecting bracket. The backrest connecting bracket is also rotatably connected to the base. One end of the backrest drive rod is rotatably connected to the other end of the backrest connecting bracket, and the other end of the backrest drive rod is rotatably connected to the base.

[0290] The fourth type of backrest assembly includes a backrest panel, a front backrest bracket, and a rear backrest bracket. The backrest panel is located on the backrest structure. One end of the front backrest bracket is rotatably connected to the backrest panel, and the other end of the front backrest bracket is rotatably connected to the base. One end of the rear backrest bracket is rotatably connected to the backrest panel, and the rear backrest bracket is rotatably connected to the base.

[0291] The fifth type of backrest assembly 13 is shown in Figures 1 and 3. The backrest assembly 13 includes a backrest panel 131, a front backrest bracket 132, a rear backrest bracket 133, and a linkage bracket 134. The backrest panel 131 is disposed on the backrest structure 100. One end of the front backrest bracket 132 and one end of the rear backrest bracket 133 are respectively rotatably connected to the backrest panel 131. The other end of the front backrest bracket 132 and the other end of the rear backrest bracket 133 are respectively rotatably connected to the base 12.

[0292] One end of the linkage bracket 134 is rotatably connected to the base 11, and the other end of the linkage bracket 134 is rotatably connected to the back support bracket 133, as shown in Figure 3.

[0293] The first type of backrest assembly, the second type of backrest assembly, the third type of backrest assembly, and the fourth type of backrest assembly: During the transition between a sitting position and a reclining position, the mechanical extension structure 1 can compress the side wall of the seat cushion structure, and the seat cushion structure undergoes elastic deformation and then indents inward.

[0294] In this application, during the transition between a sitting and reclining position, the front support of the backrest can separate from the side wall of the seat cushion structure; when the mechanical extension structure is in the sitting position, the front support of the backrest separates from the side wall of the seat cushion structure. This structure reduces the probability of the front support of the backrest puncturing the seat cushion structure.

[0295] In this application, the backrest structure 100 and the seat cushion structure 200 are prior art, therefore, the backrest structure and the seat cushion structure are not shown in the detailed drawings.

[0296] In this application, the backrest structure 100 includes a backrest frame 1001, a backrest filler 1004, and a backrest decorative cover 1005. The backrest filler 1004 is disposed inside the backrest decorative cover 1005, and the backrest decorative cover 1005 is disposed in the backrest frame 1001.

[0297] As shown in Figure 3, the support rod 18 is located below the base 12 to support the seat unit. The vertical length of the support rod 18 is L2, which is greater than or equal to 8cm.

[0298] As shown in Figures 5 and 7, the mechanical extension structure 1 also includes two sets of swing mechanisms 17. A set of leg components 14, base 11 and base 12 are movably connected to a set of swing mechanisms 17 respectively. A support rod 18 is provided below the base 12.

[0299] When the mechanical extension structure 1 is in a seated position, the distance between the lowest point of the swing mechanism 17 and the lower end face of the support rod 18 is ≥8cm; and / or, when the mechanical extension structure 1 is in a reclining position, the distance between the lowest point of the swing mechanism 17 and the lower end face of the support rod 18 is ≥8cm.

[0300] During the transition between a sitting and reclining position, at least a portion of the swing mechanism 17 can move below the base 12. This structure increases the range of motion of the base 11 relative to the base 12 within a limited space (especially within a limited front-to-back length of the seat unit) by increasing the length of the swing mechanism 17.

[0301] Because "the first driver 151 is rotatably connected to the rear of the base 11, and the first drive rod 152 is rotatably connected to the swing plate 1531," when a set of leg assemblies 14, the base 11, and the base 12 are respectively movably connected to a set of swing mechanisms 17, the leg assembly 14 can drive the base 11 to slide relative to the base 12 through the swing mechanism 17. Of course, in this application, when the first driver 151 is rotatably connected to the base 12, the swing mechanism 17 is not required.

[0302] In existing technologies, when a user sits or lies on top of a seat unit, some seat units are unable to be properly accessed by the robot vacuum cleaner to clean the floor underneath due to insufficient height of the support rod or mechanical extension structure.

[0303] The height of a robotic vacuum cleaner is around 8cm. When the distance between the lowest point of the swing mechanism and the lower end of the support rod is ≥8cm, most robotic vacuum cleaners can directly enter under the seat unit.

[0304] As shown in Figures 5 and 7, the swing mechanism 17 includes a first link 171, a second link 172 and a third link 173. One end of the first link 171 is rotatably connected to the base 12, one end of the third link 173 is rotatably connected to the leg assembly 14, the other end of the first link 171 is rotatably connected to one end of the second link 172, and the other end of the third link 173 is rotatably connected to the other end of the second link 172.

[0305] The second link 172 is rotatably connected to the base 11, wherein the eccentric position of the second link 172 is rotatably connected to the base 11.

[0306] The eccentric position of the second link 172 is rotatably connected to the base 11. This is used in conjunction with the first drive device 15 to adjust the sliding speed of the base 11 relative to the base 12. This is to match the adjustment speed of the seat unit for users of different ages. The adjustment speed is the speed at which the mechanical extension structure 1 switches back and forth between the sitting position and the reclining position.

[0307] Of course, in this application, in order to avoid the three-link structure of the swing mechanism 17, the swing mechanism 17 can also have four or more links. For example, the first link can be replaced with at least two links, the second link can be replaced with at least two links, and the third link can be replaced with at least two links. The swing mechanism and the base, base, and leg assembly can also rotate with slight sliding engagement within the limiting groove.

[0308] Preferably, the distance between the rotatable connection point of the second link 172 and the base 11 and the rotatable connection point of the first link 171 and the second link 172 is greater than the distance between the rotatable connection point of the second link 172 and the base 11 and the rotatable connection point of the third link 173 and the second link 172. The distance between the rotatable connection point of the second link 172 and the base 11 and the rotatable connection point of the first link 171 and the second link 172 is greater than the distance between the rotatable connection point of the second link 172 and the base 11 and the rotatable connection point of the third link 173 and the second link 172. This distance is used to adjust the extension difficulty of the leg assembly 14. When the distance between the rotatable connection point of the second link 172 and the base 11 and the rotatable connection point of the first link 171 and the second link 172 is greater than the distance between the rotatable connection point of the second link 172 and the base 11 and the rotatable connection point of the third link 173 and the second link 172, the movement speed of the leg assembly 14 during the transition from a sitting position to a lying position in the mechanical extension structure 1 will slow down by utilizing the lever principle. This structure allows the user to easily adjust the seat unit to a suitable angle.

[0309] Preferably, the base 11 has a groove that is recessed from the outside to the inside, and the leg assembly 14 is rotatably connected to the base 11 located in the groove by a second fastener.

[0310] At least part of the second fastener is located within the groove.

[0311] The groove is used to reduce the probability that the second fastener will collide with foreign objects during the transportation of the seat unit.

[0312] Preferably, a first elastic element is provided between the base 11 and the base 12; and / or, a second elastic element is provided between the base 11 and the leg assembly 14.

[0313] The first elastic element is used to increase the stability of the base 11 during movement relative to the base 12, and the second elastic element is used to increase the stability of the leg assembly 14 during movement relative to the base 11.

[0314] In this application, the first driving device 15 can be a different driving source.

[0315] The first type of drive source is a motor in the first drive device 15; and / or, during the process of the mechanical extension structure 1 changing from a sitting position to a lying position, the first guide member moves only along the second guide surface 16222 of the first track 1601, and the second guide member moves only along the second guide surface 16222 of the inclined section 168 and the second guide surface 16222 of the straight section 169. The motor provides a power source for the mechanical extension structure; "the first guide member moves only along the second guide surface 16222 of the first track 1601, and the second guide member moves only along the second guide surface 16222 of the inclined section 168 and the second guide surface 16222 of the straight section 169" so that the second guide surface 16222 of the first track 1601 provides support for the first guide member, and the second guide surface 16222 of the inclined section 168 and the second guide surface 16222 of the straight section 169 provide support for the second guide member. This structure effectively improves the smoothness of the mechanical extension structure 1 changing from a sitting position to a lying position.

[0316] The second guide is fixedly connected to the base 11 and is detachably mounted on the base 11. During the transition of the mechanical extension structure 1 from a sitting position to a lying position, the second guide can slide along the second guide surface 16222 of the inclined section 168, and the second guide can also slide along the second guide surface 16222 of the straight section 169. The fixed connection between the second guide and the base 11 increases the smoothness of the movement of the second guide on the inclined section 168 (or the straight section 169). In this application, the second guide can also be rotatably connected to the base 11 and is detachably mounted on the base 11. During the transition of the mechanical extension structure 1 from a sitting position to a lying position, the second guide can roll along the second guide surface 16222 of the inclined section 168, and the second guide can also roll along the second guide surface 16222 of the straight section 169. The rotatable connection between the second guide and the base 11 further reduces the frictional force of the second guide moving along the inclined section 168.

[0317] The second type of drive source is a cylinder in the first drive device 15. During the process of the mechanical extension structure 1 changing from a lying position to a sitting position, the cylinder retracts to provide assistance for the retraction of the leg assembly 14; and / or, during the process of the mechanical extension structure 1 changing from a lying position to a sitting position, the first guide moves only along the first guide surface 16221 of the first track 1601, and the second guide moves only along the first guide surface 16221 of the inclined section 168 and the first guide surface 16221 of the straight section 169. The cylinder provides auxiliary power to the mechanical extension structure 1; "the first guide moves only along the first guide surface 16221 of the first track 1601, and the second guide moves only along the first guide surface 16221 of the inclined section 168 and the first guide surface 16221 of the straight section 169" so that the first guide surface 16221 of the first track 1601 provides support for the first guide, and the first guide surface 16221 of the inclined section 168 and the first guide surface 16221 of the straight section 169 provide support for the second guide. This structure effectively improves the stability of the mechanical extension structure 1 when changing from a lying position to a sitting position.

[0318] The second guide is fixedly connected to the base 11 and is detachably mounted on the base 11. During the transition of the mechanical extension structure 1 from a lying position to a sitting position, the second guide can slide along the first guide surface 16221 of the inclined section 168, and the second guide can also slide along the first guide surface 16221 of the straight section 169. The fixed connection between the second guide and the base 11 further enhances the stability of the second guide's movement on the inclined section 168 (or the straight section 169).

[0319] In this application, the mechanical extension structure 1 disclosed in Figures 5-7 includes a first guide, a second guide, a first track 1601, and a second track 1602 in each sliding mechanism 16. When the mechanical extension structure 1 is in a sitting or lying position, the first guide is inserted into the first track 1601, and the second guide is inserted into the second track 1602. The angle between the second track 1602 and the upper end face 113 of the base 11 is greater than the angle between the first track 1601 and the upper end face 113 of the base 11. During the transition between the sitting and lying positions, the second guide moves only on the second track 1602, further increasing the stability of the second guide during movement.

[0320] The mechanical extension structure 1 disclosed in Figures 5-7 has a first drive device 15 that can be a motor; and / or, during the process of changing the mechanical extension structure 1 from a sitting position to a lying position, the first guide 161 moves only along the second guide surface 16222 of the first track 1601, and the second guide moves only along the second guide surface 16222 of the second track 1602. The motor provides a power source for the mechanical extension structure 1; the fact that "the first guide moves only along the second guide surface 16222 of the first track 1601, and the second guide moves only along the second guide surface 16222 of the second track 1602" means that the second guide surface 16222 of the first track 1601 provides support for the first guide, and the second guide surface 16222 of the second track 1602 provides support for the second guide. This structure effectively improves the smoothness of the mechanical extension structure 1 when changing from a sitting position to a lying position.

[0321] The mechanical extension structure 1 disclosed in Figures 5-7 has a first preferred structure in which a second guide member is fixedly connected to a base 11 and is detachably disposed on the base 11; during the process of the mechanical extension structure 1 changing from a sitting position to a lying position, the second guide member slides along the second guide surface 16222 of the second track 1602. The fixed connection between the second guide member and the base 11 further increases the smoothness of the movement of the second guide member on the second track 1602.

[0322] The mechanical extension structure 1 disclosed in Figures 5-7 has a second preferred structure: the second guide is rotatably connected to the base 11, and the second guide is detachably disposed on the base 11; during the process of changing the mechanical extension structure 1 from a sitting position to a lying position, the second guide rolls along the second guide surface 16222 of the second track 1602. This structure facilitates the replacement of the second guide.

[0323] The mechanical extension structure 1 disclosed in Figures 5-7 may also have a first drive device 15 that is a cylinder. During the transition from a lying to a sitting position, the cylinder retracts to assist in the retraction of the leg assembly 14; and / or, during the transition, the first guide moves only along the first guide surface 16221 of the first track 1601, and the second guide moves only along the first guide surface 16221 of the second track. The cylinder provides auxiliary power to the mechanical extension structure 1; the fact that "the first guide moves only along the first guide surface 16221 of the first track 1601, and the second guide moves only along the first guide surface 16221 of the second track 1602" ensures that the first guide surface 16221 of the first track 1601 provides support for the first guide, and the first guide surface 16221 of the second track provides support for the second guide. This structure effectively improves the smoothness of the mechanical extension structure 1 during the transition from a lying to a sitting position. Preferably, the second guide is fixedly connected to the base 11, and the second guide is detachably disposed on the base 11; during the process of the mechanical extension structure 1 changing from a lying position to a sitting position, the second guide slides along the first guide surface 16221 of the second track 1602.

[0324] The sofa includes the seat unit described in this embodiment, with a seat cushion structure 200 disposed on the base 11; wherein, the track 162 is detachably disposed on the base 12, or the track 162 is integrated with the base 12.

[0325] In this application, the track 162 is detachably mounted on the base 12 for replacement purposes; and the track 162 is integrated with the base 12 for strength requirements.

[0326] As shown in Figure 1, the first driving device 15 includes a first driver 151, a first transmission mechanism and a first driving rod 152. The first driver 151 is mounted on the base 11 or the base 12. The first driver 151 is provided with a first output shaft. The first output shaft is connected to the first driving rod 152 through the first transmission mechanism. The first driving rod 152 is rotatably connected to the swing plate 1531.

[0327] Wherein, the first driver 151 is the first motor, the first output shaft is the output shaft mounted on the first motor, and the first drive rod 152 moves axially relative to the first output shaft; the axis of the first output shaft coincides with the axis of the first drive rod 152, and after the first driver 151 drives the first output shaft to rotate, the first output shaft drives the first drive rod to move along its axis through the first transmission mechanism.

[0328] In this application, the structures of the first transmission mechanism and the first drive rod can be modified according to actual needs. For example, in the first structure, the first transmission mechanism is a bevel gear sleeved on the first output shaft, and the first drive rod is a rack meshing with the bevel gear; in the second structure, the first transmission mechanism includes at least three gears, one of which is located on the first output shaft, another gear is located on the drive rod, and the remaining gear is used to connect one of the gears with the other gear. In this case, the structure of the drive rod can refer to the telescopic rod of the existing sofa motor.

[0329] The purpose of this application is to ensure that the first driver 151 is not eccentrically positioned on the first drive rod 152, and the first drive device 15 can be adjusted according to actual needs.

[0330] The design concept of the "second transmission mechanism and second drive rod" is consistent with that of the "first transmission mechanism and first drive rod".

[0331] In the prior art, the first output shaft of the first driver is perpendicular to the first drive rod, which causes the first driver to be located on one side of the first drive rod, that is, the center of gravity of the first driver is not on the axis of the first drive rod.

[0332] In this application, since the axis of the first output shaft coincides with the axis of the first drive rod 152, the first driver 151 and the first drive rod 152 are located on the same straight line. This structure overcomes the eccentric setting of the first drive device 15, thereby improving the problem of the first drive device 15 driving the first drive rod 152 to rotate axially under its own gravity.

[0333] As shown in Figure 13, the seat unit also includes a control switch 3. The control switch 3 includes one first switch 31, another first switch 32, and a switch base. The switch base is provided with one first common terminal 311, another first common terminal 321, one first normally closed terminal 313, another first normally closed terminal 323, one first normally open terminal 312, and another first normally open terminal 322. One first switch 31 is connected to one first common terminal 311 and one first normally closed terminal 313, or one first switch 31 is connected to one first common terminal 311 and one first normally open terminal 312. The other first switch 32 is connected to another first common terminal 321 and another first normally closed terminal 323, or another first switch 32 is connected to another first common terminal 321 and another first normally open terminal 322.

[0334] In this configuration, one of the first common terminals 311 is electrically connected to the positive terminal of the first driving device 15, and the other first common terminal 321 is electrically connected to the negative terminal of the first driving device 15. One first normally closed terminal 313 and the other first normally closed terminal 323 are both connected to the negative terminal of the power supply 4, and one first normally open terminal 312 and the other first normally open terminal 322 are both connected to the positive terminal of the power supply 4. During the transition of the mechanical extension structure 1 from a sitting position to a lying position, one first switch 31 connects one first common terminal 311 to one first normally open terminal 312, and another first switch 32 connects the other first common terminal 321 to the other first normally closed terminal 323. Similarly, during the transition of the mechanical extension structure 1 from a lying position to a sitting position, one first switch 31 connects one first common terminal 311 to one first normally closed terminal 313, and the other first switch 32 connects the other first common terminal 321 to the other first normally open terminal 322. This structure simplifies the circuit structure of the first driving device 15.

[0335] As shown in Figure 12, the backrest structure 100 includes a backrest frame 1001, a headrest 1003, and a second drive device 1002. The headrest 1003 is movably disposed on the backrest frame 1001. One end of the second drive device 1002 is disposed on the backrest frame 1001, and the other end of the second drive device 1002 is movably disposed on the headrest 1003, and is used to drive the headrest 1003 to move relative to the backrest frame 1001.

[0336] As shown in Figure 14, the control switch 3 also includes one second switch 33 and another second switch 34. The switch base is provided with one second common terminal 331, another second common terminal 341, one second normally closed terminal 333, another second normally closed terminal 343, one second normally open terminal 332, and another second normally open terminal 342. One second switch 33 connects one second common terminal 331 and one second normally closed terminal 333, or one second switch 33 connects one second common terminal 331 and one second normally open terminal 332. The other second switch 34 connects another second common terminal 341 and another second normally closed terminal 343, or another second switch 34 connects another second common terminal 341 and another second normally open terminal 342.

[0337] In this configuration, one of the second common terminals 331 is electrically connected to the positive terminal of the second drive device 1002, and the other second common terminal 341 is electrically connected to the negative terminal of the second drive device 1002. One of the second normally closed terminals 333 and the other second normally closed terminal 343 are both connected to the negative terminal of the power supply 4, and one of the second normally open terminals 332 and the other second normally open terminal 342 are both connected to the positive terminal of the power supply 4. During the process of the mechanical extension structure 1 changing from a sitting position to a lying position, one of the second switches 33 connects one of the second common terminals 331 and one of the second normally open terminals 332, and another second switch 34 connects the other second common terminal 341 and the other second normally closed terminal 343. During the process of the mechanical extension structure 1 changing from a lying position to a sitting position, one of the second switches 33 connects one of the second common terminals 331 and one of the second normally closed terminals 333, and another first second switch 34 connects the other second common terminal 341 and the other second normally open terminal 342.

[0338] In Figure 12, the second drive device 1002 and the headrest 1003 have solid line positions and dashed line positions, which indicate that the second drive device 1002 and the headrest 1003 are movable.

[0339] This application preferably includes a backrest structure 100 with ventilation function: the backrest structure 100 also includes a backrest filler 1004 and a backrest decorative cover 1005. The backrest filler 1004 is disposed on the backrest decorative cover 1005, the backrest decorative cover 1005 is disposed on the backrest frame 1001, the backrest filler 1004 is provided with an air guide channel, the air guide channel is provided with an air intake and at least one air outlet, the air guide channel is provided with a fan, the fan is provided with an air inlet and an air outlet, and the gas passes through the air intake, air inlet, air outlet and air outlet in sequence in the air guide channel;

[0340] Wherein, the cross-sectional area of ​​at least one air outlet is less than the cross-sectional area of ​​the air guide channel located between the air outlet and the air outlet.

[0341] "The cross-sectional area of ​​at least one air outlet is less than the cross-sectional area of ​​the air guide channel located between the air outlet and the air outlet" is used to increase the air velocity at the air outlet, while the air guide channel enables the ventilation function of the backrest structure 100.

[0342] When the backrest cover 1005 is made of cowhide, an air vent is provided on the backrest cover 1005 to connect with the air outlet; when the backrest cover 1005 is made of technical fabric, the backrest cover 1005 may also be left without an air vent, allowing ventilation through the gaps in the technical fabric.

[0343] In this application, the air outlet hole and the air outlet are preferably misaligned;

[0344] And / or, the air guide channel between the air outlet and the air vent has a bend. This structure is used to reduce the noise transmitted from the fan to the outside of the backrest structure during operation.

[0345] This application preferably includes a backrest structure 100 with a heating function: a heater is installed in the air guide channel between the air outlet and the air vent, and the gas discharged from the air outlet flows through the heater to the air vent. The heater enables the sofa to provide heat to the user in winter.

[0346] This application preferably includes a backrest structure 100 with a massage function: the backrest structure 100 includes a backrest filling 1004 and a backrest decorative cover 1005. The backrest filling 1004 is disposed on the backrest decorative cover 1005, and the backrest decorative cover 1005 is disposed on the backrest frame 1001. The backrest filling 1004 is provided with an air guide channel, the air guide channel is provided with an air inlet and at least one air outlet, and the air guide channel is provided with a fan, the fan is provided with an air inlet and an air outlet. The gas passes through the air inlet, air inlet and air outlet in sequence in the air guide channel.

[0347] The backrest filling 1004 is equipped with at least one massage airbag connected to an air outlet. When gas enters the massage airbag without passing through the air outlet, the massage airbag does not protrude from the backrest filling 1004. After the gas enters the massage airbag through the air outlet and causes the massage airbag to deform, the massage airbag protrudes from the backrest filling 1004. This structure enables the sofa to perform a massage function.

[0348] In addition to the massage airbags, eccentric wheels can also be installed on the backrest filling 1004 of the sofa to provide users with a massage function.

[0349] Preferably, the second driving device 1002 includes a second driver, a second transmission mechanism and a second driving rod. The second driver is disposed on the backrest frame 1001. The second driver is provided with a second output shaft. The second output shaft is connected to the second driving rod through the second transmission mechanism. The second driving rod is rotatably connected to the headrest 1003.

[0350] The axis of the second output shaft coincides with the axis of the second drive rod. After the second driver drives the second output shaft to rotate, the second output shaft drives the second drive rod to move along its axis through the second transmission mechanism.

[0351] In this application, the structure of the second drive device 1002 can be referenced from the structure of the first drive device 15.

[0352] Preferably, the seat cushion structure 200 includes a seat cushion filler and a seat cushion decorative cover. The seat cushion decorative cover has an opening through which the seat cushion filler is placed. The seat cushion decorative cover has a first sealing structure at the opening, which includes one of a straight zipper, an arc zipper, and a snap-on structure. This structure facilitates cleaning, disassembly, and installation of the seat cushion decorative cover.

[0353] The sofa includes the seat unit described in this embodiment. The leg assembly 14 includes a main leg mounting plate 145, a front leg rotating plate 144, a rear leg rotating plate 143, a front leg connecting plate 141, and a rear leg connecting plate 142. One end of the front leg rotating plate 144 and one end of the rear leg rotating plate 143 are rotatably connected to the main leg mounting plate 145, the other end of the front leg rotating plate 144 is rotatably connected to one end of the front foot connecting plate 141, the other end of the rear leg rotating plate 143 is rotatably connected to one end of the rear leg connecting plate 142, the front foot connecting plate 141 is rotatably connected to the rear leg rotating plate 143, and the other ends of the front leg connecting plate 141 and the rear leg connecting plate 142 are rotatably connected to the base 11.

[0354] Preferably, the leg assembly 14 further includes a secondary leg rest mounting plate 147 and a front leg rest extension plate 146. The secondary leg rest mounting plate 147 is movably connected to the main leg rest mounting plate 145 through the front leg rest extension plate 146. The secondary leg rest mounting plate 147 is also rotatably connected to the front leg rest rotating plate 144.

[0355] As shown in Figures 1, 3 and 5, the backrest assembly 13 includes a backrest panel 131, a front backrest bracket 132, a rear backrest bracket 133 and a linkage bracket 134. The backrest panel 131 is disposed on the backrest structure 100. One end of the front backrest bracket 132 and one end of the rear backrest bracket 133 are respectively rotatably connected to the backrest panel 131. The other end of the front backrest bracket 132 and the other end of the rear backrest bracket 133 are respectively rotatably connected to the base 12.

[0356] One end of the linkage bracket 134 is rotatably connected to the base 11, and the other end of the linkage bracket 134 is rotatably connected to the front support bracket 132 of the backrest, as shown in Figure 1; or, the other end of the linkage bracket 134 is rotatably connected to the back support bracket 133 of the backrest, as shown in Figure 5.

[0357] As shown in Figure 5, the backrest support 133 includes a widened portion 1331, the length of which is ≥5cm. The other end of the linkage support 134 is rotatably connected to the backrest support 133. The length of the widened portion 1331 refers to the length of the widest part of the widened portion 1331.

[0358] The widened portion 1331 is used to increase the installation space of the linkage bracket 134 on the backrest bracket 133, so as to avoid the deformation resistance of the backrest bracket 133 being severely weakened after the linkage bracket 134 and the backrest bracket 133 are rotatably connected.

[0359] When the other end of the linkage bracket 134 is rotatably connected to the backrest bracket 133, the rotatable connection point between the other end of the linkage bracket 134 and the backrest bracket 133 is the second transition point 20, and the rotatable connection point between one end of the backrest bracket 133 and the backrest plate 131 is the third transition point 10.

[0360] When the mechanical extension structure 1 is in a seated position, the second transition point 20 is located below the third transition point 10, as shown in Figure 5; when the mechanical extension structure 1 is in a reclining position, the second transition point 20 is located above the third transition point 10, as shown in Figure 7. When the mechanical extension structure 1 is in a reclining position, by raising the height of the second transition point 20, the linkage bracket 134 is raised relative to the backrest bracket 133; this structure effectively improves the stability of the backrest assembly 13 when the mechanical extension structure 1 is in a reclining position.

[0361] Preferably, one end of the linkage bracket 134 is rotatably connected to the side wall of the base 11. This structure increases the deformation resistance of the base 11.

[0362] As shown in Figure 1, when the other end of the linkage bracket 134 is rotatably connected to the front backrest bracket 132, the rotatable connection point between the other end of the linkage bracket 134 and the front backrest bracket 132 is the fourth transition point, and the rotatable connection point between one end of the front backrest bracket 132 and the backrest panel 131 is the fifth transition point.

[0363] When the mechanical extension structure 1 is in a sitting position, the fourth transition point is below the fifth transition point; when the mechanical extension structure 1 is in a reclining position, the fourth transition point is above the fifth transition point. When the mechanical extension structure 1 is in a reclining position, raising the height of the fourth transition point increases the connection between the linkage bracket 134 and the front backrest bracket 132; this structure effectively improves the stability of the backrest assembly 13 when the mechanical extension structure 1 is in a reclining position.

[0364] Preferably, one end of the linkage bracket 134 is rotatably connected to the side wall of the base 11. This structure further increases the deformation resistance of the base 11 and prevents the linkage bracket 134 from extending below the base 11.

[0365] As shown in Figure 5, the thickness of the backrest panel 131 is less than 3 mm, and the backrest panel 131 has several outwardly extending protrusions 1311, the thickness of which is greater than 3 mm. This structure ensures the deformation resistance of the backrest panel 131 while reducing its manufacturing cost.

[0366] In this application, the backrest assembly 13 may also include a third structure: the backrest assembly includes a backrest panel, a front backrest bracket, a rear backrest bracket, and a linkage bracket. The backrest panel is disposed on the backrest structure. One end of the front backrest bracket and one end of the rear backrest bracket are respectively rotatably connected to the backrest panel. The other end of the rear backrest bracket is rotatably connected to the base. The front backrest bracket is also rotatably connected to the base. One end of the linkage bracket is rotatably connected to the other end of the front backrest bracket, and the other end of the linkage bracket is rotatably connected to the rear backrest bracket.

[0367] As shown in Figure 1, the base 11 is provided with a hook-on portion 112 and a mounting structure 111 for engaging the seat cushion structure. The mounting structure 111 is located outside the hook-on portion 112, and a clearance space 110 is provided between the mounting structure 111 and the base 11. Part of the seat cushion structure can enter the clearance space 110. The seat cushion structure entering the clearance space 110 is usually a hook provided on the seat cushion structure. The mounting structure 111 is located outside the hook-on portion 112, which allows the mounting structure 111 to replace part of the function of the base 11; that is, without reducing the supporting strength of the base 11, the size of the base 11 can be reduced, thereby reducing the manufacturing cost of the seat unit.

[0368] As shown in Figures 1, 2, and 3, the mounting structure 111 includes a mounting member disposed on the base 11. The mounting member has at least two mounting rods 1111. At least one mounting rod 1111 is disposed on the base 11 and forms a clearance space 110 with the base 11. The seat cushion structure can be hung on any one of the mounting rods 1111. The at least two mounting rods 1111 provide at least two mounting positions for the seat cushion structure. The base 11 has multiple mounting positions, allowing the base 11 to accommodate seat cushion structures of different sizes.

[0369] As shown in Figure 15, the sofa control method includes the sofa described in this embodiment, and the sofa further includes:

[0370] Control switch 3 is electrically connected to the first drive device 15;

[0371] Signal acquisition module 41 is used to collect control signals;

[0372] Controller 4, control switch 3 and signal acquisition module 41 are electrically connected through controller 4;

[0373] Sofa control methods include:

[0374] The signal acquisition module 41 transmits the acquired control signal to the controller 4. Based on the control signal, the controller 4 controls the first drive device 15 through the control switch 3 so that the first drive device 15 adjusts the position of the base 11 relative to the base 12.

[0375] This structure enables the adjustment of the position of the base 11 relative to the base 12 by voice signals (or wireless signals, which can come from terminals such as remote controls, mobile phones, iPads, and computers).

[0376] Preferably, in this application, the control switch 3 is connected to the second drive device 1002, and the signal acquisition module 41 transmits the acquired control signal to the controller 4. Based on the control signal, the controller 4 controls the second drive device 1002 through the control switch 3 so that the second drive device 1002 adjusts the position of the headrest 1003 relative to the backrest frame 1001.

[0377] This structure allows for adjustment of the position of the headrest 1003 relative to the backrest frame 1001 using voice or wireless signals.

[0378] Preferably, the signal acquisition module 41 of this application includes a voice acquisition module and / or an invalid signal receiving module.

[0379] Preferably, the control switch 3 includes transistors, MOSFETs, relays, etc., and one of the transistors, MOSFETs, and relays is electrically connected to the signal acquisition module 41 through the controller 4.

[0380] Preferably, in this application, the control switch 3 is connected to the fan, and the signal acquisition module 41 transmits the acquired control signal to the controller 4. Based on the control signal, the controller 4 controls the fan through the control switch 3 to start or stop the fan. This structure enables the ventilation function of the sofa to be controlled by voice or wireless signals.

[0381] Preferably, in this application, the control switch 3 is connected to the ambient light, and the signal acquisition module 41 transmits the acquired control signal to the controller 4. Based on the control signal, the controller 4 controls the ambient light through the control switch 3 to turn the ambient light on or off. This structure enables voice or wireless signal control of the sofa's ambient light, especially enabling the sofa to be illuminated at night.

[0382] As shown in Figure 15, the sofa control method includes the sofa described in this embodiment, and the sofa further includes:

[0383] Control switch 3 is electrically connected to the first drive device 15;

[0384] The first sensor 42 is used to collect the first real-time electrical signal of the first driving device 15;

[0385] Controller 4, control switch 3 and first sensor 42 are electrically connected through controller 4;

[0386] The controller 4 presets a first reference electrical signal. After the first real-time electrical signal received by the controller 4 is less than the first reference electrical signal, the controller 4 controls the first drive device 15 through the control switch 3 so that the first drive device 15 drives the leg assembly 14 to move in front of the base 11.

[0387] The maximum travel of the first drive rod 152 is fixed. Therefore, the position of the first drive device 15 is calibrated by the first sensor 42 to avoid the accumulation of errors in the first drive device 15.

[0388] Preferably, in this application, when the mechanical extension structure 1 is in a lying position, the first sensor 42 collects the limit electrical signal of the first drive device 15; when the mechanical extension structure 1 is in the lying position again, the first sensor 42 collects a first real-time electrical signal. If the first real-time electrical signal received by the controller 4 is not equal to the limit electrical signal, an alarm signal is output. This structure enables the first sensor 42 to calibrate the limit position of the first drive device 15.

[0389] As shown in Figure 15, the sofa control method includes the sofa described in this embodiment, and the sofa further includes:

[0390] Control switch 3 is electrically connected to the second drive device 1002;

[0391] The second sensor 43 is used to collect the second real-time electrical signal of the second drive device 1002;

[0392] Controller 4, control switch 3 and second sensor 43 are electrically connected through controller 4;

[0393] The controller 4 presets a second reference electrical signal. After the second real-time electrical signal received by the controller 4 is less than the second reference electrical signal, the controller 4 controls the second drive device 1002 through the control switch 3 so that the second drive device 1002 drives the headrest 1003 to move away from the backrest frame 1001.

[0394] The maximum travel of the second drive rod is fixed. Therefore, the position of the second drive device 1002 is calibrated by the second sensor 43 to avoid the accumulation of errors in the second drive device 1002.

[0395] As shown in Figure 15, the sofa control method includes the sofa described in this embodiment, and the sofa further includes:

[0396] Control switch 3 is electrically connected to the first drive device 15;

[0397] The third sensor 44 is used to collect the first real-time position signal of the first driving device 15;

[0398] Controller 4, control switch 3 and third sensor 44 are electrically connected through controller 4;

[0399] Sofa control methods include:

[0400] The controller 4 presets a first designated position signal. The third sensor 44 transmits the first real-time position signal it has collected to the controller 4. After comparing the first real-time position signal with the first designated position signal, the controller 4 drives the first drive device 15 through the control switch 3 so that the first drive device 15 adjusts the position of the base 11 relative to the base 12.

[0401] In the prior art, various seat units are disclosed. The seat unit includes a backrest structure, a seat cushion structure, a leg rest structure, a mechanical extension structure, and a control switch. The mechanical extension structure has a sitting position and a reclining position. When the control switch controls the mechanical extension structure to change from a sitting position to a reclining position, the leg rest structure extends forward toward the seat cushion structure, and the backrest structure reclines backward. When the control switch controls the mechanical extension structure to change from a reclining position to a sitting position, the leg rest structure retracts downward toward the seat cushion structure, and the backrest structure returns to its original position.

[0402] However, existing mechanical extension structures require continuous button pressing to adjust the seat unit to the desired position; that is, mechanical extension structures cannot adjust to the user's desired position with a single button press.

[0403] In this application, the third sensor 44, in conjunction with the controller 4, enables the base 11 to be adjusted to the user-preset position with a single click.

[0404] Preferably, the sofa further includes a fourth sensor 45, which is connected to the second drive device 1002 and is used to collect the second real-time position signal of the second drive device 1002.

[0405] The controller 4 presets a second designated position signal, and the fourth sensor 45 transmits the collected second real-time position signal to the controller 4. After comparing the second real-time position signal with the second designated position signal, the controller 4 drives the second drive device 1002 through the control switch 3 so that the second drive device 1002 adjusts the position of the headrest 1003 relative to the backrest frame 1001.

[0406] In this application, the fourth sensor, in conjunction with the controller, enables the headrest to be adjusted to the user's preset position with a single click.

[0407] In this application, when the sofa includes a third sensor 44 and / or a fourth sensor 45, the control switch 3 can be controlled by a physical switch, or the control switch 3 can be controlled by a signal acquisition module 41.

[0408] Electronic devices include:

[0409] The system includes a memory and a processor, wherein the processor is configured to run a program stored in the memory, wherein the program executes the sofa control method described in this embodiment.

[0410] In this application, the up, down, front, and rear orientations of the seat unit are based on the directions indicated by the arrows in Figures 3 and 6.

[0411] In this application, "and / or" means either one or both.

[0412] In this application, the front-back direction in Figures 3 and 6 is the direction of the horizontal plane (also referred to as the horizontal direction), and the up-down direction in Figures 3 and 6 is the vertical direction (also referred to as the vertical direction).

[0413] The above description is only of the preferred embodiment of this application and should not be construed as limiting the claims. This application is not limited to the above embodiments, and all variations made within the scope of protection of the independent claims of this application are within the scope of protection of this application.

Claims

1. A mechanical extension structure, comprising a base, a base, two sets of backrest assemblies, two sets of leg assemblies, a connecting structure, and a first drive device, wherein the backrest assemblies are movably disposed at the rear of the base, the leg assemblies are movably disposed at the front of the base, the connecting structure is fixedly connected to the two sets of leg assemblies, and the connecting structure includes a swing plate rotatably connected to the first drive device. The mechanical extension structure has a sitting position and a lying position. During the process of changing the mechanical extension structure from the sitting position to the lying position, the first drive device drives the base to move forward through the leg assembly, so that the leg assembly extends in front of the base and the backrest assembly tilts backward relative to the base. During the process of changing the mechanical extension structure from the lying position to the sitting position, the first drive device drives the base to move backward through the leg assembly, so that the leg assembly retracts under the base and the backrest assembly returns to its original position relative to the base. characterized in that The mechanical extension structure also includes two sets of sliding mechanisms. Each set of sliding mechanisms includes at least two guides and at least two rails. One of the guides and rails is fixedly connected to the base, and the other is fixedly connected to the base. The guides are inserted into the rails, and at least part of the rails are in clearance fit with the guides. During the process of changing between a sitting position and a lying position, the guides can slide along the first guide surface or the second guide surface.

2. The mechanical expanse structure of claim 1, wherein, When the mechanical extension structure is in a seated position, the track and guide are in clearance fit; and / or, when the mechanical extension structure is in a reclining position, the track and guide are in clearance fit.

3. The mechanical expanse structure of claim 2, wherein, Each sliding mechanism includes a first guide, a second guide, a first track, and a second track. When the mechanical extension structure is in a seated position, the first guide is inserted into the first track, and the second guide is inserted into the second track. At least a portion of the second track is located below the first track, and / or at least a portion of the second guide is located below the first guide.

4. The mechanical expanse structure of claim 3, wherein, Two sets of sliding mechanisms are mirror images of each other on both sides of the base. The base and / or the second track are provided with a first limiting structure to prevent the second guide from sliding outside the second track and separating from the second track. When the mechanical extension structure is in the sitting position, the second guide abuts against the first limiting structure.

5. The mechanical expanse structure of claim 4, wherein, The second track is equipped with a buffer pad, the hardness of which is less than that of the first limiting structure. When the mechanical extension structure is in a sitting position, the second guide does not abut against the buffer pad; when the mechanical extension structure is in a lying position, the second guide abuts against the buffer pad, and the buffer pad is located between the second guide and the first limiting structure.

6. The mechanical expanse structure of claim 3, wherein, The first and second tracks are set at an angle, with the angle between the first track and the horizontal plane being less than the angle between the second track and the horizontal plane; The first and second tracks have the same tilt direction.

7. The mechanical stretch structure according to any of claims 1-6, characterized in that When the mechanical extension structure is in a seated position, -10° ≤ the angle between the upper end face of the base and the horizontal plane ≤ 12°.

8. The mechanical stretch structure according to any one of claims 1 to 6, wherein The guide component contacts the track surface.

9. The mechanical stretch structure according to any one of claims 1 to 6, wherein The guide is fixedly connected to the base, and the guide is detachably mounted on the base.

10. The mechanical expanse structure of claim 9, wherein, The guide is threaded to the base, and / or, when the guide is fixedly connected to the base, an annular gasket is clamped between the guide and the base.

11. The mechanical expanse structure of claim 10, wherein, The guide has an arc surface that contacts the track, and the connecting force between the guide and the base is greater than the sliding friction force generated by the guide sliding along the track.

12. The mechanical expanse structure of claim 10, wherein, When an annular gasket is clamped between the guide and the base, the radial width of the annular gasket is greater than the width of the guide. During the transition of the mechanical extension structure from a seated position to a reclining position, the annular pad can slide along the track or base.

13. The mechanical expanse structure of claim 9, wherein, The guide and the base are fixedly connected by at least two first fasteners.

14. The mechanical expanse structure of claim 13, wherein, At least one first fastener may slide along the guide and / or base to change the spacing between two adjacent first fasteners.

15. The mechanical spanning structure according to any of claims 1-6, characterized in that The guide includes a slide rod with a first tapered section, the diameter of which gradually decreases along the axial direction of the slide rod, and the first tapered section can abut against the track; and / or, the track has a second tapered section, which is inclined along the axial direction of the guide and can abut against the guide. When the guide is provided with a first tapering section and the track is provided with a second tapering section, the first tapering section abuts against the second tapering section.

16. A seat unit characterized by It includes a backrest structure, a seat cushion structure, and a mechanical extension structure as described in any one of claims 1-15, wherein the backrest assembly is disposed on the backrest structure, and the seat cushion structure is disposed above the base; When the mechanical extension structure is in a seated position, the backrest assembly compresses the seat cushion structure, which then undergoes elastic deformation and indents inward.

17. The seating unit of claim 16, wherein, When the mechanical extension structure is in a reclining position, the backrest assembly compresses the seat cushion structure, causing the seat cushion structure to elastically deform and indent inward; or, when the mechanical extension structure is in a reclining position, there is a gap between the backrest assembly and the seat cushion structure.

18. The seating unit of claim 17, wherein, The base includes four connecting rods, which are connected end to end to form a quadrilateral. At least one connecting rod includes a first angle iron, a second angle iron, and a mounting plate. The first angle iron includes a first horizontal plate and a first vertical plate. The second angle iron includes a second horizontal plate and a second vertical plate. The first horizontal plate is fixedly connected to the second vertical plate, and the second horizontal plate is fixedly connected to the first vertical plate. The height of the first vertical plate is greater than the height of the second vertical plate. When the first horizontal plate is fixedly connected to the second vertical plate and the second horizontal plate is fixedly connected to the first vertical plate, the inner side of the first vertical plate and the outer side of the second vertical plate are fixedly connected to the mounting plate. The mechanical extension structure also includes a first drive device, and the mounting plate is directly or indirectly rotatably connected to the first drive device.

19. The seating unit of claim 16, wherein, The first driving device includes a first driver and a first driving rod disposed on the first driver. The first driver is rotatably connected to the rear of the base, and the first driving rod is rotatably connected to the swing plate. The connecting structure also includes a connecting rod, which is rotatably connected to the base, and the swing plate and leg assembly are fixedly connected to the connecting rod respectively.

20. The seating unit of claim 19, wherein, A bearing is provided between the connecting rod and the base; and / or, a lubricant is provided at the rotatable connection between the connecting rod and the base.

21. The seating unit of claim 19, wherein, The base has at least one support block, and at least one connecting rod is located below the support block. The base can abut against the connecting rod through the support block; and / or, at least part of the support block is located between the side wall of the base and the side wall of the connecting rod.

22. The seating unit of claim 21, wherein, The base has flanges on both sides, and the flanges on both sides and the base form a receiving groove, with at least part of the support block located in the receiving groove.

23. The seating unit of claim 19, wherein, The base has a hook on its front side and a hooking channel on its rear side. The mechanical extension structure also includes a seat cushion elastic element, with one end of the seat cushion elastic element located on the hook and the other end of the seat cushion elastic element located on the hooking channel.

24. The seating unit of claim 17, wherein, The backrest structure includes a backrest frame, a backrest filling, and a backrest decorative cover. The backrest filling is located on the backrest decorative cover, and the backrest decorative cover is located on the backrest frame. The front of the backrest filling has an inwardly recessed decorative groove, and the backrest decorative cover is detachably inserted into the decorative groove.

25. The seating unit of claim 24, wherein, The backrest decorative cover and the decorative groove are fixedly connected by Velcro, and the backrest decorative cover is detachably mounted on the backrest frame; And / or, the decorative groove includes inclined groove walls, and the cross-sectional area of ​​the groove opening is less than the cross-sectional area of ​​the groove bottom.

26. The seating unit of claim 19, wherein, The mechanical extension structure also includes two sets of swing mechanisms. A set of leg components, a base, and a base are movably connected to a set of swing mechanisms, and a support rod is provided under the base. When the mechanical extension structure is in a seated position, the distance between the lowest point of the swing mechanism and the lower end face of the support rod is ≥8cm; and / or, when the mechanical extension structure is in a reclining position, the distance between the lowest point of the swing mechanism and the lower end face of the support rod is ≥8cm.

27. The seating unit of claim 26, wherein, The swing mechanism includes a first link, a second link, and a third link. One end of the first link is rotatably connected to the base, and the other end of the first link is rotatably connected to one end of the second link. One end of the third link is rotatably connected to the leg assembly, and the other end of the third link is rotatably connected to the other end of the second link. The eccentric position of the second link is rotatably connected to the base.

28. The seating unit of claim 17, wherein, The base has a recessed groove that extends from the outside in, and the leg assembly is rotatably connected to the base located in the groove by a second fastener; At least part of the second fastener is located within the groove.

29. The seating unit of claim 17, wherein, A first elastic element is provided between the base and the base plate; and / or, a second elastic element is provided between the base and the leg assembly.

30. A sofa characterized by The seat unit includes any one of claims 16-29, wherein the seat cushion structure is disposed on the base; wherein the track is detachably disposed on the base, or the track is integrated with the base.

31. The sofa of claim 30, wherein, The first driving device includes a first driver, a first transmission mechanism and a first driving rod. The first driver is mounted on a base or a base, and the first driver is provided with a first output shaft. The first output shaft is connected to the first driving rod through the first transmission mechanism, and the first driving rod is rotatably connected to the swing plate. The axis of the first output shaft coincides with the axis of the first drive rod. After the first driver drives the first output shaft to rotate, the first output shaft drives the first drive rod to move along its axis through the first transmission mechanism.

32. The sofa of claim 30, wherein, The seat unit also includes a control switch, which includes two first switches and a switch base. The switch base is provided with two first common terminals, two first normally closed terminals and two first normally open terminals. Each first switch connects one of the first common terminals and one of the first normally closed terminals, or the first switch connects one of the first common terminals and one of the first normally open terminals. In this configuration, one of the first common terminals is electrically connected to the positive terminal of the first driving device, and the other first common terminal is electrically connected to the negative terminal of the first driving device. Both first normally closed terminals are connected to the negative terminal of the power supply, and both first normally open terminals are connected to the positive terminal of the power supply. During the process of the mechanical extension structure changing from a sitting position to a lying position, one of the first switches connects one of the first common terminals to one of the first normally open terminals, and the other first switch connects the other first common terminal to the other first normally closed terminal. During the process of the mechanical extension structure changing from a lying position to a sitting position, one of the first switches connects one of the first common terminals to one of the first normally closed terminals, and the other first switch connects the other first common terminal to the other first normally open terminal.

33. The sofa of claim 32, wherein, The backrest structure includes a backrest frame, a headrest, and a second drive device. The headrest is movably disposed on the backrest frame, one end of the second drive device is disposed on the backrest frame, and the other end of the second drive device is movably disposed on the headrest, and is used to drive the headrest to move relative to the backrest frame. The control switch also includes two second switches. The switch base is also provided with two second common terminals, two second normally closed terminals and two second normally open terminals. Each second switch connects one of the second common terminals and one of the second normally closed terminals, or the second switch connects one of the second common terminals and one of the second normally open terminals. One of the second common terminals is electrically connected to the positive terminal of the second driving device, and the other second common terminal is electrically connected to the negative terminal of the second driving device. Both second normally closed terminals are connected to the negative terminal of the power supply, and both second normally open terminals are connected to the positive terminal of the power supply. During the process of the second driving device driving the headrest away from the backrest frame, one of the second switches connects one of the second common terminals to one of the second normally open terminals, and the other second switch connects the other second common terminal to the other second normally closed terminal. During the process of the second driving device driving the headrest closer to the backrest frame, one of the first switches connects one of the first common terminals to one of the first normally closed terminals, and the other first switch connects the other first common terminal to the other first normally open terminal.

34. The sofa of claim 33, wherein, The backrest structure also includes a backrest filling and a backrest decorative cover. The backrest filling is located on the backrest decorative cover, and the backrest decorative cover is located on the backrest frame. The backrest filling is provided with an air guide channel. The air guide channel is provided with an air intake and at least one air outlet. The air guide channel is provided with a fan. The fan is provided with an air inlet and an air outlet. The gas passes through the air intake, air inlet, air outlet and air outlet in sequence in the air guide channel. Wherein, the cross-sectional area of ​​at least one air outlet is less than the cross-sectional area of ​​the air guide channel located between the air outlet and the air outlet.

35. The sofa of claim 34, wherein, The air outlet and air vent are misaligned. And / or, the air guide channel located between the air outlet and the air hole is provided with a bend.

36. The sofa of claim 35, wherein, A heater is installed in the air guide channel between the air outlet and the air outlet hole. The gas discharged from the air outlet flows through the heater to the air outlet hole.

37. The sofa of claim 33, wherein, The backrest structure includes a backrest filling and a backrest decorative cover. The backrest filling is located on the backrest decorative cover, which is located on the backrest frame. The backrest filling is provided with an air guide channel. The air guide channel is provided with an air inlet and at least one air outlet. The air guide channel is provided with a fan. The fan is provided with an air inlet and an air outlet. The gas passes through the air inlet, air inlet, air outlet and air outlet in sequence in the air guide channel. The backrest filling is provided with at least one massage airbag connected to the air outlet. When the gas enters the massage airbag without the air outlet, the massage airbag does not protrude from the backrest filling. After the gas enters the massage airbag through the air outlet and causes the massage airbag to deform, the massage airbag protrudes from the backrest filling.

38. The sofa of claim 33, wherein, The second drive device includes a second driver, a second transmission mechanism, and a second drive rod. The second driver is located on the backrest frame and has a second output shaft. The second output shaft is connected to the second drive rod through the second transmission mechanism, and the second drive rod is rotatably connected to the headrest. The axis of the second output shaft coincides with the axis of the second drive rod. After the second driver drives the second output shaft to rotate, the second output shaft drives the second drive rod to move along its axis through the second transmission mechanism.

39. The sofa of claim 30, wherein, The seat cushion structure includes a seat cushion filling material and a seat cushion decorative cover. The seat cushion decorative cover has an opening, through which the seat cushion filling material is placed into the seat cushion decorative cover. The seat cushion decorative cover has a sealing structure at the opening, which includes one of a straight zipper, an arc zipper, and a buckle structure.

40. A control method of a sofa, characterized by, The sofa includes any one of claims 30-39, and the sofa further includes: The control switch is electrically connected to the first drive unit; The signal acquisition module is used to collect control signals; The controller, control switch, and signal acquisition module are electrically connected through the controller; Sofa control methods include: The signal acquisition module transmits the acquired control signals to the controller. Based on the control signals, the controller controls the first drive device through a control switch, so that the first drive device adjusts the position of the base relative to the base.

41. The method of claim 40, wherein: The control switch is connected to the second drive device. The signal acquisition module acquires the control signal and transmits it to the controller. Based on the control signal, the controller controls the second drive device through the control switch so that the second drive device adjusts the position of the headrest relative to the backrest frame.

42. The method of claim 41, wherein the sofa is controlled. The signal acquisition module includes a voice acquisition module and / or an invalid signal receiving module.

43. The method of claim 40, wherein the sofa is controlled by a remote control. The control switch is connected to the fan, and the signal acquisition module transmits the acquired control signals to the controller. Based on the control signals, the controller controls the fan through the control switch to start or stop the fan.

44. The method of claim 40, wherein the sofa is controlled. The control switch is connected to the ambient light. The signal acquisition module transmits the acquired control signal to the controller. Based on the control signal, the controller controls the ambient light through the control switch to turn the ambient light on or off.

45. A control method of a sofa, characterized by, The sofa includes any one of claims 30-39, and the sofa further includes: The control switch is electrically connected to the first drive unit; The first sensor is used to collect the first real-time electrical signal of the first driving device; The controller, control switch and first sensor are electrically connected through the controller; The controller presets a first reference electrical signal. When the first real-time electrical signal received by the controller is less than the first reference electrical signal, the controller controls the first drive device through the control switch so that the first drive device drives the leg assembly to move forward of the base.

46. The method of claim 45, wherein: When the mechanical extension structure is in a lying position, the first sensor collects the limit electrical signal of the first drive device; when the mechanical extension structure is in a lying position again, the first sensor collects the first real-time electrical signal. If the first real-time electrical signal received by the controller is not equal to the limit electrical signal, an alarm signal is output.

47. A control method of a sofa, characterized by, The sofa includes any one of claims 30-39, and the sofa further includes: The control switch is electrically connected to the second drive unit. The second sensor is used to collect the second real-time electrical signal of the second drive device; The controller, control switch and second sensor are electrically connected through the controller; The controller presets a second reference electrical signal. When the second real-time electrical signal received by the controller is less than the second reference electrical signal, the controller controls the second drive device through the control switch so that the second drive device drives the headrest to move away from the backrest frame.

48. A control method of a sofa, characterized by, The sofa includes any one of claims 30-39, and the sofa further includes: The control switch is electrically connected to the first drive unit; The third sensor is used to collect the first real-time position signal of the first drive device; The controller, control switch and third sensor are electrically connected through the controller; Sofa control methods include: The controller presets a first designated position signal. The third sensor transmits the first real-time position signal it collects to the controller. After comparing the first real-time position signal with the first designated position signal, the controller drives the first drive device through a control switch so that the first drive device adjusts the position of the base relative to the base.

49. The control method of claim 48, wherein, The sofa also includes a fourth sensor, which is connected to the second drive unit and is used to acquire the second real-time position signal of the second drive unit. The controller presets a second designated position signal, and the fourth sensor transmits the collected second real-time position signal to the controller. After comparing the second real-time position signal with the second designated position signal, the controller drives the second drive device through a control switch to adjust the position of the headrest relative to the backrest frame.

50. An electronic device, comprising include: A memory and a processor, the processor being configured to run a program stored in the memory, wherein the program, when running, executes the control method for the sofa according to claims 40-49.

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