Seat unit and sofa

Abstract

The utility model relates to a kind of seat unit and sofa, solve the problem of poor user experience feeling.Seat unit includes backrest structure, seat cushion structure and mechanical extension structure, mechanical extension structure further includes two groups of sliding mechanism, each group of sliding mechanism includes at least two guides and at least two tracks, one of guide and track is located in base, the other is located in base, each track is equipped with first guide surface and second guide surface, each guide is located between the first guide surface and the second guide surface of a track, at least part of track and guide clearance fit, in the process of transformation between sitting position and lying position of mechanical extension structure, guide can move along first guide surface or second guide surface, to make base move along base.

Description

Technical Field

[0001] This utility model relates to a seat unit and a sofa. Background Technology

[0002] The seat unit includes a base, a pedestal, and a mechanical extension structure. The mechanical extension structure has a sitting position and a reclining position. During the transition between the sitting and reclining positions, the pedestal moves back and forth relative to the base.

[0003] The mechanical extension structure includes a guide, typically a slider, and a track on the base. The guide is inserted into the track with an interference fit. During the transition between a seated and a reclining position, the guide slides along the track, allowing the base to move back and forth relative to the base. While the interference fit between the guide and the track increases stability during the back-and-forth movement of the base relative to the base, it also increases friction during the sliding process of the guide relative to the track.

[0004] However, as the friction increases during the sliding of the guide along the track, it slows down the speed at which the base moves back and forth relative to the base. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a seat unit and sofa that solves the problem of slow back-and-forth movement speed of the base relative to the seat.

[0006] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method: The seat unit includes a backrest structure, a seat cushion structure, and a mechanical extension structure. The mechanical extension structure includes a base, a base, two sets of backrest assemblies, two sets of leg assemblies, and a drive mechanism. The seat cushion structure is located above the base, the backrest structure is movably located behind the base via the backrest assemblies, the leg assemblies are movably located in front of the base, the drive mechanism is located in the leg assemblies, and the drive mechanism is also movably located in the base or base. The mechanical extension structure has a sitting position and a reclining position. During the process of changing the mechanical extension structure from the sitting position to the reclining position, the 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 reclining position to the sitting position, the 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. 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 located on the base, and the other is located on the base. Each rail has a first guide surface and a second guide surface. Each guide is located between the first guide surface and the second guide surface of a rail. At least part of the rail is in clearance fit with the guide. During the transition between the sitting position and the lying position of the mechanical extension structure, the guide can move along the first guide surface or the second guide surface, so that the base moves along the base.

[0007] In this invention, each track segment is provided with a first guide surface and a second guide surface, and each guide member is located between the first guide surface and the second guide surface of a track segment. At least part of the track and the guide member are in clearance fit. During the transition between the sitting and lying positions of the mechanical extension structure, the guide member can move along the first guide surface or the second guide surface. Because of the clearance fit between "at least part of the track and the guide member" and "the guide member can move along the first guide surface or the second guide surface", the guide member will not be in interference fit with the track throughout the transition between the sitting and lying positions of the mechanical extension structure.

[0008] The structure where the guide component does not have a full interference fit with the track reduces the squeezing force between the guide component and the track, thereby reducing the friction of the guide component as it moves along the track. With reduced friction, the base's forward and backward movement relative to the base can be increased, thus solving the problem of slow forward and backward movement of the base relative to the base.

[0009] Furthermore, the mechanical extension structure includes two sets of sliding mechanisms, mirrored on both sides of the base. Since each set of sliding mechanisms includes at least two guides and at least two rails, at least two rails are located on one side of the base (or on the base itself). The base can provide support through the at least two guides. This structure ensures the stability of the base during its movement along the base.

[0010] This invention solves the problem of slow forward and backward movement of the base relative to the base by using "the base to provide support for the base through at least two guides" and "at least part of the track to be in clearance fit with the guides", while ensuring the smooth movement of the base.

[0011] Preferably, each sliding mechanism includes a first guide, a second guide, a first track, a second track, and a third track connected to the 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; when the mechanical extension structure is in a reclining position, the first guide is inserted into the first track and the second guide is inserted into the third track. Among them, the angle between the second track and the upper surface of the base is greater than the angle between the third track and the upper surface of the base, the length of the first track is greater than the length of the second track, and the length of the first track is greater than the length of the third track.

[0012] Based on extensive questionnaires, the majority of usage scenarios for the seat unit are users sitting or lying on top of it. To enable users to quickly change from a sitting to a reclining position, the angle between the second track and the upper surface of the base is greater than the angle between the third track and the upper surface of the base. In the initial stage of the mechanical extension structure changing from a sitting to a reclining position, because the angle between the second track and the upper surface of the base is greater than the angle between the third track and the upper surface of the base, users experience a certain degree of weightlessness and zero gravity to meet their need for quickly adjusting their seat posture.

[0013] In order to match the seat unit with the personalized needs of different users (personalized needs include height, weight, and reclining angle), the angle between the third track and the upper surface of the base is less than the angle between the second track and the upper surface of the base.

[0014] Preferably, at least a portion of the second track is located below the first track, and when the mechanical extension structure is in a seated position, at least a portion of the second guide is located below the first guide; Among them, the angle between the second track and the upper surface of the base is greater than the angle between the first track and the upper surface of the base.

[0015] Since at least part of the second guide is located below the first guide, the front of the base can tilt slightly downward when the mechanical extension structure is in a seated position, which makes it easier for the user to get up from the seat.

[0016] 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 ≤5°. This structure ensures that the user can easily get up while preventing the user from easily slipping off the seat cushion structure.

[0017] Preferably, the driving device is a motor; and / or, during the process of the mechanical extension structure changing from a sitting position to a lying position, the first guide moves only along the lower end face of the first track, and the second guide moves only along the lower end faces of the second track and the third track. The motor provides a power source for the mechanical extension structure; the phrase "the first guide moves only along the lower end face of the first track, and the second guide moves only along the lower end faces of the second track and the third track" ensures that the lower end face of the first track provides support for the first guide, and the lower end faces of the second and third tracks provide support for the second guide. This structure effectively improves the smoothness of the mechanical extension structure changing from a sitting position to a lying position.

[0018] Preferably, the second guide is fixedly connected to the base, and the second guide is detachably mounted on the base; during the process of the mechanical extension structure changing from a sitting position to a lying position, the second guide can slide along the lower end surface of the second track, and the second guide can also slide along the lower end surface of the third track. The fixed connection between the second guide and the base increases the stability of the movement of the second guide on the second track (or the third track).

[0019] Preferably, the second guide is rotatably connected to the base, and the second guide is detachably mounted on the base; during the process of the mechanical extension structure changing from a sitting position to a lying position, the second guide can roll along the lower end surface of the second track, and the second guide can also roll along the lower end surface of the third track. The rotatable connection between the second guide and the base can further reduce the frictional force of the second guide moving along the second track.

[0020] Preferably, the driving device is a cylinder. During the transition of the mechanical extension structure from a lying position to a sitting position, the cylinder retracts to assist in the retraction of the leg assembly; and / or, during the transition of the mechanical extension structure from a lying position to a sitting position, the first guide moves only along the upper surface of the first track, and the second guide moves only along the upper surfaces of the second and third tracks. The cylinder provides auxiliary power to the mechanical extension structure; the phrase "the first guide moves only along the upper surface of the first track, and the second guide moves only along the upper surfaces of the second and third tracks" ensures that the upper surface of the first track provides support for the first guide, and the upper surfaces of the second and third tracks provide support for the second guide. This structure effectively improves the stability of the mechanical extension structure during the transition from a lying position to a sitting position.

[0021] The preferred cylinder is a gas spring, which is an existing technology. For details, please refer to the gas springs in automobiles. Gas springs require external tension when the mechanical extension structure changes from a sitting position to a reclining position; while gas springs can recover by their own weight when the mechanical extension structure changes from a reclining position to a sitting position.

[0022] Preferably, the second guide is fixedly connected to the base, and the second guide is detachably mounted on the base; during the process of the mechanical extension structure changing from a lying position to a sitting position, the second guide can slide along the upper surface of the second track, and the second guide can also slide along the upper surface of the third track. The fixed connection between the second guide and the base further increases the stability of the movement of the second guide on the second track (or the third track).

[0023] 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 sitting or lying position, the first guide is inserted into the first track, and the second guide is inserted into the second track. Specifically, the angle between the second track and the upper surface of the base is greater than the angle between the first track and the upper surface of the base. During the transition between a seated and a reclining position, the second guide moves only on the second track, further enhancing the stability of the second guide during movement.

[0024] Preferably, the driving device is a motor; and / or, during the process of the mechanical extension structure changing from a sitting position to a lying position, the first guide member moves only along the lower end face of the first track, and the second guide member moves only along the lower end face of the second track. The motor provides a power source for the mechanical extension structure; the phrase "the first guide member moves only along the lower end face of the first track, and the second guide member moves only along the lower end face of the second track" ensures that the lower end face of the first track provides support for the first guide member, and the lower end face of the second track provides support for the second guide member. This structure effectively improves the smoothness of the mechanical extension structure changing from a sitting position to a lying position.

[0025] Preferably, the second guide is fixedly connected to the base, and the second guide is detachably disposed on the base; during the process of the mechanical extension structure changing from a sitting position to a lying position, the second guide slides along the lower end surface of the second track. The fixed connection between the second guide and the base further increases the smoothness of the movement of the second guide on the second track.

[0026] Preferably, the second guide is rotatably connected to the base, and the second guide is detachably mounted on the base; during the transition of the mechanical extension structure from a sitting position to a lying position, the second guide rolls along the lower end face of the second track. This structure facilitates the replacement of the second guide.

[0027] Preferably, the driving device is a cylinder. During the transition of the mechanical extension structure from a lying position to a sitting position, the cylinder retracts to assist in the retraction of the leg components; and / or, during the transition of the mechanical extension structure from a lying position to a sitting position, the first guide moves only along the upper surface of the first track, and the second guide moves only along the upper surface of the second track. The cylinder provides auxiliary power to the mechanical extension structure; the phrase "the first guide moves only along the upper surface of the first track, and the second guide moves only along the upper surface of the second track" ensures that the upper surface of the first track provides support for the first guide, and the upper surface of the second track provides support for the second guide. This structure effectively improves the stability of the mechanical extension structure during the transition from a lying position to a sitting position.

[0028] Preferably, the second guide is fixedly connected to the base, and the second guide is detachably disposed on the base; during the process of the mechanical extension structure changing from a lying position to a sitting position, the second guide slides along the upper end surface of the second track. The fixed connection between the second guide and the base increases the stability of the movement of the second guide on the second track.

[0029] Preferably, the base is provided with a hook-on portion and a mounting structure for engaging the seat cushion structure. The mounting structure is located outside the hook-on portion, and a clearance space is provided between the mounting structure and the base, allowing part of the seat cushion structure to enter the clearance space. The mounting structure's location outside the hook-on portion allows it to replace part of the base's function; that is, without reducing the base's support strength, the size of the base can be reduced, thereby lowering the manufacturing cost of the seat unit.

[0030] Preferably, the mounting structure includes a mounting member disposed on the base, the mounting member having at least two mounting rods, at least one mounting rod being disposed on the base and forming a clearance space with the base, and the seat cushion structure being able to be hung on any of the mounting rods. The at least two mounting rods can provide at least two mounting positions for the seat cushion structure, and the base has multiple mounting positions, allowing the base to be matched with seat cushion structures of different sizes.

[0031] Preferably, a fixing plate is provided below the base, and a mounting plate is provided between the fixing plate and the lower end face of the base, with the drive device rotatably connected to the mounting plate. The fixing plate and the mounting plate are used to further increase the connection strength between the drive device and the base.

[0032] Preferably, the mounting portion includes a mounting channel and a hook, and the seat unit also includes an elastic element, with one end of the elastic element mounted on the mounting channel and the other end mounted on the hook. Compared to setting a hook on the base, setting a mounting channel on the base can effectively reduce the impact of the mounting portion on the base's resistance to deformation.

[0033] Preferably, the drive device is located at an off-center position on the base.

[0034] In existing technology, the 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 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 drive rod. Therefore, this invention places the drive rod at an off-center position in the base to further reduce the probability of the serpentine spring contacting the drive rod.

[0035] 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.

[0036] In existing technology, decorative seams are provided on the front of the backrest cover to enhance the aesthetics of the backrest structure. These seams are typically created using stitching, tensioning, or tying strips. This invention, however, presents the decorative seam on the front of the backrest cover by creating decorative grooves in the backrest filling.

[0037] 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; 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.

[0038] When the backrest cover is detachably mounted on the backrest frame, it can be removed from the backrest frame without any tools. Usually, the backrest cover is equipped with a zipper. When the backrest cover and the decorative groove are fixedly connected by Velcro, the backrest filling can be removed from the backrest cover without any tools.

[0039] The phrase "the decorative groove includes inclined groove walls, and the cross-sectional area of ​​the decorative groove opening is less than the cross-sectional area of ​​the decorative groove bottom" is used to increase the difficulty of removing the Velcro, thereby improving the user experience of the seat unit.

[0040] Preferably, the track includes an inclined section and a straight section, with an arc transition between the inclined section and the straight section. When the guide is located at the arc transition between the inclined section and the straight section, the guide is in an interference fit with the track. Specifically, when the mechanical extension structure is in a seated position, 5° < the angle between the inclined section and the upper surface of the base < 45°; when the mechanical extension structure is in a lying position, 3° ≤ the angle between the upper surface of the base and the horizontal plane < 10°.

[0041] When the guide is located at the arc transition between the inclined section and the straight section, and the guide is in interference fit with the track, the arc transition between the inclined section and the straight section can physically forcefully change the movement trajectory of the guide to prevent the guide from separating from the track.

[0042] Extensive market research revealed that the most comfortable angle for a user to lie on the seat unit is when the angle between the upper surface of the base and the horizontal plane is less than 10° (≤ 3°). Since the movement distance of the guide is controlled by the swing plate, to ensure the base moves to the most comfortable angle for the seat unit within a limited track travel distance, the track of this invention includes an inclined section. This inclined section is set to a specific inclination angle (specific inclination angle: 5° < angle between the inclined section and the upper surface of the base < 45°), thus enabling the base to move to the most comfortable angle for the seat unit within a limited track travel distance.

[0043] Preferably, the angle between the first track 1601 and the upper end face 113 of the base 11 is ≤8°, with a range of 1° ≤ 8°. This structure avoids gaps between the seat cushion structure and the backrest structure by raising the height of the rear of the base 11.

[0044] The sofa includes the seating unit described in any of the above technical solutions, and the driving device includes: The driver is movably mounted on the base or pedestal; A drive lever, which is movably mounted on the driver; The connecting structure is fixedly connected to the leg assembly and rotatably connected to the base. The connecting structure includes a swing plate that is rotatably connected to the drive rod. During the transformation of the mechanical extension structure between a sitting position and a lying position, the drive rod drives the connecting structure to rotate relative to the base through the swing plate.

[0045] 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 drive rod on the actuator. 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.

[0046] The connecting structure is fixed to the leg assembly. During the transition between the sitting and lying positions, the drive rod drives the connecting structure to rotate relative to the base via a swing plate, so that the connecting structure can extend the leg assembly in front of the base or retract it below the base.

[0047] In this invention, since the connecting mechanism is rotatably connected to the base, the base provides support for the connecting mechanism throughout the process of the leg assembly extending in front of the base (or the leg assembly retracting below the base). This means that during the process of the leg assembly extending in front of the base (or the leg assembly retracting below the base), the base can reduce at least part of the torque required for the connecting mechanism to drive the leg assembly.

[0048] Preferably, the connection structure includes at least one connecting rod rotatably connected to the base, and the swing plate is fixedly connected to the connecting rod; 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.

[0049] 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.

[0050] Preferably, the hardness of the support block is less than the hardness of the base, the hardness of the support block is less than the hardness of the connecting rod, and the distance between the support block and the connecting rod is less than the width of the connecting rod.

[0051] When the hardness of the support block is less than the hardness of the base, and when the hardness of the support block is less than the hardness of the connecting rod, the support block can absorb some of the impact force from external objects through its own deformation, thereby further reducing the deformation amplitude of the base after being impacted by external forces. When the hardness of the support block is less than the hardness of the base, and when the hardness of the support block is less than the hardness of the connecting rod, after being impacted by external forces, the deformation of the support block precedes the deformation of the connecting rod, and the deformation of the support block precedes the deformation of the base.

[0052] The rule that "the distance between the support block and the connecting rod should be less than the width of the connecting rod" is used to prevent the base from breaking before the support block has made contact with the connecting rod.

[0053] Preferably, the connecting rod is a circular connecting rod, and the support block has an arc-shaped groove corresponding to the connecting rod, with at least a portion 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 and to increase the contact area between the connecting rod and the support block; this structure prevents the support block from sliding along the connecting rod and separating from the connecting rod after the base is impacted by external force; that is, it ensures the reliability of the support block's operation.

[0054] Preferably, the mechanical extension structure further includes a swing mechanism, and the leg assembly, base, and base are movably connected to the swing mechanism. When the mechanical extension structure is in a sitting position, the swing plate and the swing mechanism are both located above the lower end face of the base; when the mechanical extension structure is in a lying position, the swing plate and the swing mechanism are both located above the lower end face of the base. The base is equipped with a support rod, the height of which is ≥8mm. The robot vacuum can easily access and clean the area under the sofa, whether the user is sitting or lying down.

[0055] 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.

[0056] Preferably, the backrest assembly includes a backrest panel, a front backrest bracket, a rear backrest bracket, and a backrest drive rod. The backrest panel is disposed 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. Alternatively, the 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 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. Alternatively, the 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. Alternatively, the 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.

[0057] Preferably, the thickness of the backrest panel is <3mm, and the backrest panel has several outwardly extending protrusions, the thickness of which is >3mm. This structure ensures the deformation resistance of the backrest panel while reducing its manufacturing cost.

[0058] Preferably, during the transition between a sitting and lying position, the front support of the backrest can compress the side wall of the seat cushion structure, causing the seat cushion structure to deform elastically and inward.

[0059] In the prior art, during the process of changing from a sitting position to a reclining position, if the user's hand accidentally reaches between the front support of the backrest and the base, the user's hand will be trapped between the front support of the backrest and the base.

[0060] In this invention, because the backrest front support presses against the side wall of the seat cushion structure during the process of the mechanical extension structure changing from a sitting position to a lying position, the user can receive a clear signal when their hand is placed between the backrest front support and the base, thus reminding the user of the risk of hand pinching.

[0061] Preferably, 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. Attached Figure Description

[0062] Figure 1 This is a perspective view of the second type of mechanical extension structure in this utility model; Figure 2 This is a front view of the second type of mechanical extension structure in this utility model (the mechanical extension structure is located in a seated position). Figure 3 This is a perspective view of the first type of mechanical extension structure in this utility model (the mechanical extension structure is located in a lying position). Figure 4 This is a cross-sectional view of the first structure of the sliding mechanism in this utility model; Figure 5 This is a cross-sectional view of the second structure of the sliding mechanism in this utility model; Figure 6 This is a cross-sectional view of the third structure of the sliding mechanism in this utility model; Figure 7 This is a cross-sectional view of the connecting rod, support block, and part of the base in this utility model. Detailed Implementation

[0063] The present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings: like Figure 1 and Figure 3 As shown, this utility model discloses a seat unit including a backrest structure, a seat cushion structure, and a mechanical extension structure 1. The mechanical extension structure 1 includes a base 11, a base 12, two sets of backrest assemblies 13, two sets of leg assemblies 14, and a drive device 15. The seat cushion structure is located above the base 11, the backrest structure is movably located behind the base 11 via the backrest assembly 13, the leg assembly 14 is movably located in front of the base 11, and the drive device 15 is located on the leg assembly 14. The drive device 15 is movably located on the base 11 or the base 12. The mechanical extension structure 1 has a sitting position and a lying position. During the process of changing the mechanical extension structure 1 from the sitting position to the lying position, the 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 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. The mechanical extension structure 1 also includes two sets of sliding mechanisms 16. Each set of sliding mechanisms 16 includes at least two guides 161 and at least two sections of track 162. One of the guides 161 and the track 162 is located on the base 11, and the other is located on the base 12. Each section of track 162 is provided with a first guide surface 16221 and a second guide surface 16222. Each guide 161 is located between the first guide surface 16221 and the second guide surface 16222 of a section of track 162. At least part of the track 162 is clearance-fitted with the guide 161. During the process of changing between a sitting position and a lying position, the guide 161 can move along the first guide surface 16221 or the second guide surface 16222, so that the base 11 moves along the base 12.

[0064] In this invention, 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. Because of the clearance fit between "at least a portion of the track and the guide member" and the movement of "the guide member 161 along the first guide surface 16221 or the second guide surface 16222", the guide member 161 will not be in full interference fit with the track 162 during the transition between a sitting position and a lying position.

[0065] The structure that "guide 161 will not be in an interference fit with track 162 throughout the entire movement" reduces the squeezing force between guide 161 and track 162, thereby reducing the friction of guide 161 during its movement along track 162. With the reduced friction of guide 161 during its movement along track 162, the forward and backward movement speed of base 11 relative to base 12 can be correspondingly increased, thus solving the problem of slow forward and backward movement speed of base 11 relative to base 12.

[0066] like Figure 2As shown, each track 162 is provided with a groove 1622, and a first guide surface 16221 and a second guide surface 16222 are provided in the groove 1622.

[0067] 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.

[0068] Furthermore, the mechanical extension structure 1 includes two sets of sliding mechanisms 16, which are mirror images of each other on both sides of the base 11. Since each set of sliding mechanisms 16 includes at least two guides 161 and at least two rails 162, at least two rails 162 are provided on one side of the base 12. The base 12 can provide support to the base 11 through the at least two guides 161. Figure 1 and Figure 3 As shown. This structure ensures the stability of the base 11 during its movement along the base 12.

[0069] In other words, this utility model solves the problem of slow forward and backward movement of the base 11 relative to the base 12 by having "the base 12 provide support for the base 11 through at least two guides 161" and "at least part of the track 162 is in clearance fit with the guides 161", while ensuring the smooth movement of the base 11.

[0070] The track 162 includes an inclined section and a straight section, with the inclined section and the straight section transitioning to an arc. When the guide 161 is located at the arc transition between the inclined section and the straight section, the guide 161 and the track 162 are interference-fitted. When the mechanical extension structure 1 is in a seated position, 5° < the angle between the inclined section and the upper end face 113 of the base 11 < 45°; when the mechanical extension structure 1 is in a lying position, 3° ≤ the angle between the upper end face 113 of the base 11 and the horizontal plane < 10°.

[0071] 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.

[0072] Among them, the horizontal plane is Figure 2 The front and rear directions; the inclined segment uses its centerline and 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 its centerline and 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; the first track 1601 uses its centerline and 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.

[0073] 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, to ensure that the base 11 moves to the most comfortable angle of the seat unit within the limited travel of the track 162, the track 162 of this invention includes an inclined section. This inclined section is set to a specific inclination angle (specific inclination angle: 5° < the angle between the inclined section and the upper surface 113 of the base 11 < 45°), thus enabling the base 11 to move to the most comfortable angle of the seat unit within the limited travel of the track 162.

[0074] In this utility model, the sliding mechanism 16 includes two structures. The first structure of the sliding mechanism 16 is as follows: Figure 1 As shown, each sliding mechanism 16 includes a first guide, a second guide, a first track 1601, a second track 168, and a third track 169 connected to the second track 168. 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 168; when the mechanical extension structure 1 is in a reclining position, the first guide is inserted into the first track 1601, and the second guide is inserted into the third track 169. Among them, the included angle between the second track 168 and the upper end face 113 of the base 11 is greater than the included angle between the third track 169 and the upper end face 113 of the base 11, the length of the first track 1601 is greater than the length of the second track 168, and the length of the first track 1601 is greater than the length of the third track 169.

[0075] In this utility model, the first guide is a guide 161 located on the first track 1601, and the second guide is a guide 161 located on the second track 168 or the third track 169; the second track 168 and the third track 169 are connected to form a complete track 1602, wherein the inclined section is the second track 168 and the straight section is the third track 169.

[0076] Based on extensive questionnaire surveys, the majority of usage scenarios for the seat unit are users sitting or lying on top of the seat unit. To enable users to quickly change from a sitting to a lying position, the angle between the second track 168 and the upper surface 113 of the base 11 is greater than the angle between the third track 169 and the upper surface 113 of the base 11. In the initial stage of the mechanical extension structure 1 changing from a sitting to a lying position, because the angle between the second track 168 and the upper surface 113 of the base 11 is greater than the angle between the third track 169 and the upper surface 113 of the base 11, users experience a certain degree of weightlessness and zero gravity to meet their need to quickly adjust their seat posture.

[0077] In order to match the seat unit with the personalized needs of different users (personalized needs include height, weight, and reclining angle), the angle between the third track 169 and the upper end face 113 of the base 11 is less than the angle between the second track 168 and the upper end face 113 of the base 11.

[0078] Preferably, at least a portion of the second track 168 is located below the first track 1601, and when the mechanical extension structure 1 is in a seated position, at least a portion of the second guide is located below the first guide; Wherein, the angle between the second track 168 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.

[0079] Since at least part of the second guide is located below the first guide, the base 11 can tilt slightly downwards when the mechanical extension structure 1 is in a seated position, which makes it easier for the user to get up from the seat.

[0080] Preferably, the angle between the first track 1601 and the upper end face 113 of the base 11 is ≤8°, with a range of 1° ≤ 8°. This structure avoids gaps between the seat cushion structure and the backrest structure by raising the height of the rear of the base 11.

[0081] In this invention, 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 ≤5°. This structure ensures that the user can easily get up while preventing the user from easily slipping off the seat cushion structure when sitting on it.

[0082] In this invention, "and / or" means that one of the two can be selected, or both can be selected.

[0083] like Figure 1 , Figure 2 and Figure 4 As shown, the drive device 15 is a motor; 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 lower end face 16222 of the first track 1601, and the second guide member moves only along the lower end face 16222 of the second track 168 and the lower end face 16222 of the third track 169. The motor provides a power source for the mechanical extension structure; the fact that "the first guide member moves only along the lower end face 16222 of the first track 1601, and the second guide member moves only along the lower end face 16222 of the second track 168 and the lower end face 16222 of the third track 169" means that the lower end face 16222 of the first track 1601 provides support for the first guide member, and the lower end faces 16222 of the second track 168 and the lower end faces 16222 of the third track 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.

[0084] like Figure 4 and Figure 5 As shown, 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 lower end face 16222 of the second track 168, and can also slide along the lower end face 16222 of the third track 169. The fixed connection between the second guide and the base 11 increases the stability of the second guide's movement on the second track 168 (or the third track 169). In this invention, 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 lower end face 16222 of the second track 168, and can also roll along the lower end face 16222 of the third track 169. The rotatable connection between the second guide and the base 11 further reduces the frictional force of the second guide moving along the second track 168.

[0085] like Figure 6 As shown, the drive device 15 can also be a cylinder, which retracts to assist the retraction of the leg assembly 14 during the process of the mechanical extension structure 1 changing from a lying position to a sitting position; 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 upper end surface 16221 of the first track 1601, and the second guide moves only along the upper end surface 16221 of the second track 168 and the upper end surface 16221 of the third track 169. The cylinder provides auxiliary power to the mechanical extension structure 1; "the first guide moves only along the upper end face 16221 of the first track 1601, and the second guide moves only along the upper end face 16221 of the second track 168 and the upper end face 16221 of the third track 169" so that the upper end face 16221 of the first track 1601 provides support for the first guide, and the upper end face 16221 of the second track 168 and the upper end face 16221 of the third track 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.

[0086] like Figure 6 As shown, 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 upper end surface 16221 of the second track 168, and can also slide along the upper end surface 16221 of the third track 169. The fixed connection between the second guide and the base 11 further enhances the stability of the second guide's movement on the second track 168 (or the third track 169).

[0087] In this invention, the sliding mechanism 16 includes two structures. The second structure of the sliding mechanism 16 includes a first guide, a second guide, a first track, and a second track. When the mechanical extension structure 1 is in a sitting or lying position, the first guide is inserted into the first track, and the second guide is inserted into the second track. The angle between the second track and the upper surface of the base is greater than the angle between the first track and the upper surface of the base. During the transition between the sitting and lying positions, the second guide only moves on the second track, further increasing the stability of the second guide during movement.

[0088] The second type of sliding mechanism can be driven by a motor; and / or, during the transition of the mechanical extension structure from a seated position to a reclining position, the first guide moves only along the lower end face of the first track, and the second guide moves only along the lower end face of the second track. The motor provides the power source for the mechanical extension structure; the phrase "the first guide moves only along the lower end face of the first track, and the second guide moves only along the lower end face of the second track" ensures that the lower end face of the first track provides support for the first guide, and the lower end face of the second track provides support for the second guide. This structure effectively improves the smoothness of the mechanical extension structure as it transitions from a seated position to a reclining position.

[0089] The second type of sliding mechanism, in its first preferred structure, involves a second guide member fixedly connected to the base, and the second guide member being detachably mounted on the base. During the transition of the mechanical extension structure from a seated position to a reclining position, the second guide member slides along the lower end face of the second track. The fixed connection between the second guide member and the base further enhances the smoothness of the second guide member's movement on the second track.

[0090] The second type of sliding mechanism, in its second preferred configuration, involves a second guide member rotatably connected to the base, and the second guide member being detachably mounted on the base. During the transition of the mechanical extension structure from a seated position to a reclining position, the second guide member rolls along the lower end face of the second track. This configuration facilitates the replacement of the second guide member.

[0091] The sliding mechanism of the second structure can also be driven by a cylinder. During the transition from a lying to a sitting position, the cylinder retracts to assist in the retraction of the leg assembly; and / or, during the transition, the first guide moves only along the upper surface of the first track, and the second guide moves only along the upper surface of the second track. The cylinder provides auxiliary power to the mechanical extension structure; the phrase "the first guide moves only along the upper surface of the first track, and the second guide moves only along the upper surface of the second track" ensures that the upper surface of the first track provides support for the first guide, and the upper surface of the second track provides support for the second guide. This structure effectively improves the smoothness of the transition from a lying to a sitting position. Preferably, the second guide is fixedly connected to the base, and the second guide is detachably mounted on the base; during the transition, the second guide slides along the upper surface of the second track. The second guide is fixedly connected to the base to increase the smoothness of the movement of the second guide on the second track.

[0092] like Figure 1 As shown, 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.

[0093] like Figure 1 , Figure 2 and Figure 3 As shown, the mounting structure 111 includes a mounting member disposed on the base 11. The mounting member is provided with 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 can provide at least two mounting positions for the seat cushion structure. The base 11 has multiple mounting positions, which allows the base 11 to match seat cushion structures of different sizes.

[0094] like Figure 3 As shown, a fixing plate 115 is provided below the base 11, and a mounting plate is provided between the fixing plate 115 and the lower end face of the base 11. The drive device 15 is rotatably connected to the mounting plate. The fixing plate 115 and the mounting plate are used to further increase the connection strength between the drive device 15 and the base 11.

[0095] Preferably, the mounting portion 112 includes a mounting channel and a hook, and the seat unit also includes an elastic element, one end of which is mounted on the mounting channel and the other end of which is mounted on the hook. Compared to setting a hook on the base, setting a mounting channel on the base 11 can effectively reduce the impact of the mounting portion on the deformation resistance of the base 11.

[0096] like Figure 1 As shown, the drive device 15 is located at an eccentric position on the base 11.

[0097] In the prior art, the 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 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 drive rod. Therefore, this invention places the drive device 15 at an eccentric position on the base 11 to further reduce the probability of the serpentine spring contacting the drive device 15.

[0098] like Figure 1 and Figure 3 As shown, the drive device 15 includes a driver 151 and a drive rod 152. The driver 151 is rotatably connected to the base 11, and the drive rod 152 is rotatably connected to the swing rod 1531.

[0099] The sofa includes the seating unit described in this embodiment, and the drive device 15 includes: A driver 151 is movably disposed on a base 11 or a base 12; Drive rod 152, drive rod 152 is movably mounted on driver 151; 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 drive rod 152. During the process of the mechanical extension structure 1 changing between a sitting position and a lying position, the drive rod 152 drives the connecting structure 153 to rotate relative to the base 11 through the swing plate 1531.

[0100] 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 drive rod on the actuator. 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.

[0101] The connecting structure 153 is fixed to the leg assembly 14. During the process of changing between the sitting position and the lying position, the 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.

[0102] In this invention, 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.

[0103] Preferably, the connecting structure 153 includes at least one connecting rod rotatably connected to the base 11, such as... Figure 3 As shown, the swing plate 153 is fixedly connected to the connecting rod; like Figure 7 As shown, 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.

[0104] 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.

[0105] In this invention, the connecting structure 153 may include a connecting rod, and the two sets of leg assemblies 14 are connected by the connecting rod, such as... Figure 3 As shown; in this utility model, the connecting structure 153 may also include two connecting rods, each connecting rod is connected to a set of leg components 14, and each connecting rod is fixedly connected to the swing plate 1531.

[0106] In this invention, 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 width of the connecting rod. Since the connecting rod of this invention is circular, the width of the connecting rod is equal to the diameter of the connecting rod.

[0107] Preferably, the base 11 is made of metal, the support block 114 is made of plastic, and the connecting rod is made of metal.

[0108] 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.

[0109] like Figure 7 As shown, 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 a portion 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.

[0110] Figure 2 To facilitate the demonstration of 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, 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.

[0111] like Figure 1 , Figure 2 and Figure 3 The mechanical extension structure 1 also includes a swing mechanism 17. The leg assembly 14, the base 11, and the base 12 are movably connected to the swing mechanism 17. When the mechanical extension structure 1 is in a sitting position, the swing plate 1531 and the swing mechanism 17 are both located above the lower end face 121 of the base 12. When the mechanical extension structure 1 is in a lying position, the swing plate 1531 and the swing mechanism 17 are both located above the lower end face 121 of the base 12. The base 12 is equipped with a support rod, the height of which is ≥8mm. The robot vacuum can easily access and clean the area under the sofa, whether the user is sitting or lying down.

[0112] In the prior art, when a user sits on 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 below the seat unit due to insufficient height of the support rod or mechanical extension structure 1.

[0113] like Figure 1 and Figure 3 As shown, 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 second link 172 is rotatably connected to the base 11, 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.

[0114] Of course, in order to avoid the three-link structure of the swing mechanism 17 in this utility model, 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, the base, and the leg assembly can also rotate with slight sliding cooperation within the limiting groove.

[0115] In this utility model, the backrest assembly preferably has four structures: 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. 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. 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. 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. The fifth type of backrest assembly 13, as shown Figure 1 and Figure 3 As shown, 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. 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 133. Figure 3 As shown.

[0116] The fifth type of backrest component 13, such as Figure 1 As shown, the backrest support 133 includes a widened portion 1331, the length of which is ≥5cm, and the other end of the linkage support 134 is rotatably connected to the backrest support 133; wherein, the length of the widened portion 1331 refers to the length of the widest part of the widened portion 1331.

[0117] Preferably, the thickness of the backrest panel 131 is less than 3 mm, and the backrest panel 131 has a plurality of 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 the manufacturing cost of the backrest panel 131.

[0118] 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.

[0119] In the prior art, during the process of changing from a sitting position to a reclining position, if the user's hand accidentally reaches between the front support of the backrest and the base, the user's hand will be trapped between the front support of the backrest and the base.

[0120] In this invention, because the backrest front support presses against the side wall of the seat cushion structure during the process of the mechanical extension structure changing from a sitting position to a lying position, the user can receive a clear signal when their hand is placed between the backrest front support and the base, thus reminding the user of the risk of hand pinching.

[0121] In this invention, 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.

[0122] In this invention, the backrest structure and seat cushion structure are existing technologies; therefore, the backrest structure and seat cushion structure are not shown in the accompanying drawings.

[0123] In this utility model, 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.

[0124] Preferably, the backrest structure includes a backrest frame, a backrest elastic element, a backrest filler, and a backrest decorative cover. The backrest panel is inserted into the backrest frame, the backrest filler is disposed inside the backrest decorative cover, the backrest decorative cover is disposed in the backrest frame, and the backrest elastic element is disposed in the backrest frame to provide elastic support for the backrest decorative cover.

[0125] In existing technology, decorative seams are provided on the front of the backrest cover to enhance the aesthetics of the backrest structure. These seams are typically created using stitching, tensioning, or tying strips. This invention, however, presents the decorative seam on the front of the backrest cover by creating decorative grooves in the backrest filling.

[0126] In this invention, 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. Of course, the backrest decorative cover being hung on the decorative groove, and the snap-fit ​​connection between the backrest decorative cover and the decorative groove, is also detachable.

[0127] When the backrest cover is detachably mounted on the backrest frame, it can be removed from the backrest frame without any tools. Usually, the backrest cover is equipped with a zipper. When the backrest cover and the decorative groove are fixedly connected by Velcro, the backrest filling can be removed from the backrest cover without any tools.

[0128] The phrase "the decorative groove includes inclined groove walls, and the cross-sectional area of ​​the decorative groove opening is less than the cross-sectional area of ​​the decorative groove bottom" is used to increase the difficulty of removing the Velcro, thereby improving the user experience of the seat unit.

[0129] Preferably, the backrest cover has a first sealing structure with a first zipper. The first zipper is used to open or close the first sealing structure. After the first zipper opens the first sealing structure, the backrest filling can enter the backrest cover from the first sealing structure. This structure, in conjunction with Velcro, allows the backrest filling to be removed from the backrest cover without the need for any tools.

[0130] Preferably, the backrest decorative cover is hung on the backrest frame. Of course, in the prior art, the backrest decorative cover can also be fixedly connected to the backrest frame.

[0131] In the existing technology, the backrest decorative cover can also fix the backrest filling inside by stitching or buckle, but this structure can also adopt the Velcro of this utility model.

[0132] This utility model includes two types of seat cushion structures: 1. A seat cushion structure comprising 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, the seat cushion decorative cover is disposed on a base, and the seat cushion elastic element is disposed on the base to provide elastic support for the seat cushion decorative cover. 2. A seat cushion structure comprising 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, the seat cushion decorative cover is disposed on the seat cushion frame, the seat cushion frame is disposed on a base, and the seat cushion elastic element is disposed on the seat cushion frame to provide elastic support for the seat cushion decorative cover.

[0133] Preferably, the seat cushion cover has a second sealing structure, and the second sealing structure has 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 cover from the second sealing structure.

[0134] Preferably, when the seat cushion cover is located on the base, the seat cushion cover is hung on the base; when the seat cushion cover is located on the seat cushion frame, the seat cushion cover is hung on the seat cushion frame.

[0135] In this embodiment, the up, down, front, and rear positions of the seat unit are... Figure 2 The direction indicated by the middle arrow shall prevail.

[0136] The above description only illustrates the preferred embodiment of this utility model and should not be construed as limiting the claims. This utility model is not limited to the above embodiments, and all variations made within the scope of the independent claims of this utility model are within its protection scope.

Claims

1. A seat unit, including a backrest structure, a seat cushion structure and a mechanical extension structure, wherein the mechanical extension structure includes a base, a base, two sets of backrest assemblies, two sets of leg assemblies and a drive device, the seat cushion structure is located above the base, the backrest structure is movably located behind the base via the backrest assemblies, the leg assemblies are movably located in front of the base, the drive device is located in the leg assemblies, and the drive device is also movably located in the base or the base. The mechanical extension structure has a sitting position and a reclining position. During the process of changing the mechanical extension structure from the sitting position to the reclining position, the 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 reclining position to the sitting position, the 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. Its features are, 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 located on the base, and the other is located on the base. Each rail has a first guide surface and a second guide surface. Each guide is located between the first guide surface and the second guide surface of a rail. At least part of the rail is in clearance fit with the guide. During the transition between the sitting position and the lying position of the mechanical extension structure, the guide can move along the first guide surface or the second guide surface, so that the base moves along the base.

2. The seat unit according to claim 1, characterized in that, Each sliding mechanism includes a first guide, a second guide, a first track, a second track, and a third track connected to the 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; when the mechanical extension structure is in a reclining position, the first guide is inserted into the first track and the second guide is inserted into the third track. Among them, the angle between the second track and the upper surface of the base is greater than the angle between the third track and the upper surface of the base, the length of the first track is greater than the length of the second track, and the length of the first track is greater than the length of the third track.

3. The seat unit according to claim 2, characterized in that, At least a portion of the second track is located below the first track, and when the mechanical extension structure is in a seated position, at least a portion of the second guide is located below the first guide; Among them, the angle between the second track and the upper surface of the base is greater than the angle between the first track and the upper surface of the base.

4. The seat unit according to claim 3, characterized in that, When the mechanical extension structure is in a seated position, the angle between the upper end face of the base and the horizontal plane is ≤5°.

5. The seat unit according to claim 2, characterized in that, The drive device is a motor; and / or, during the process of the mechanical extension structure changing from a sitting position to a lying position, the first guide moves only along the lower end face of the first track, and the second guide moves only along the lower end face of the second track and the lower end face of the third track.

6. The seat unit according to claim 5, characterized in that, The second guide is fixedly connected to the base and is detachably mounted on the base; during the process of the mechanical extension structure changing from a sitting position to a lying position, the second guide can slide along the lower end surface of the second track, and the second guide can also slide along the lower end surface of the third track.

7. The seat unit according to claim 5, characterized in that, The second guide is rotatably connected to the base and is detachably mounted on the base; during the process of the mechanical extension structure changing from a sitting position to a lying position, the second guide can roll along the lower end face of the second track, and the second guide can also roll along the lower end face of the third track.

8. The seat unit according to claim 2, characterized in that, The drive device is a cylinder. During the process of the mechanical extension structure changing from a lying position to a sitting position, the cylinder retracts to assist in the retraction of the leg assembly; and / or, during the process of the mechanical extension structure changing from a lying position to a sitting position, the first guide moves only along the upper surface of the first track, and the second guide moves only along the upper surfaces of the second track and the upper surfaces of the third track.

9. The seat unit according to claim 8, characterized in that, The second guide is fixedly connected to the base and is detachably mounted on the base; during the process of the mechanical extension structure changing from a lying position to a sitting position, the second guide can slide along the upper surface of the second track, and the second guide can also slide along the upper surface of the third track.

10. The seat unit according to claim 1, characterized in that, 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 sitting or lying position, the first guide is inserted into the first track, and the second guide is inserted into the second track. Among them, the angle between the second track and the upper surface of the base is greater than the angle between the first track and the upper surface of the base.

11. The seat unit according to claim 10, characterized in that, The drive device is a motor; and / or, during the process of the mechanical extension structure changing from a sitting position to a lying position, the first guide moves only along the lower end face of the first track, and the second guide moves only along the lower end face of the second track.

12. The seat unit according to claim 11, characterized in that, The second guide is fixedly connected to the base, and the second guide is detachably mounted on the base; during the process of the mechanical extension structure changing from a sitting position to a lying position, the second guide slides along the lower end surface of the second track.

13. The seat unit according to claim 11, characterized in that, The second guide is rotatably connected to the base, and the second guide is detachably mounted on the base; during the process of the mechanical extension structure changing from a sitting position to a lying position, the second guide rolls along the lower end face of the second track.

14. The seat unit according to claim 10, characterized in that, The drive device is a cylinder, and during the process of the mechanical extension structure changing from a lying position to a sitting position, the cylinder retracts to assist in the retraction of the leg assembly; and / or, during the process of the mechanical extension structure changing from a lying position to a sitting position, the first guide moves only along the upper surface of the first track, and the second guide moves only along the upper surface of the second track.

15. The seat unit according to claim 14, characterized in that, The second guide is fixedly connected to the base, and the second guide is detachably mounted on the base; during the process of the mechanical extension structure changing from a lying position to a sitting position, the second guide slides along the upper surface of the second track.

16. The seat unit according to any one of claims 1-15, characterized in that, The base is provided with a hook-on part and an installation structure for snapping the seat cushion structure. The installation structure is located on the outside of the hook-on part, and there is a clearance space between the installation structure and the base. Part of the seat cushion structure can enter the clearance space.

17. The seat unit according to claim 16, characterized in that, The mounting structure includes a mounting component on the base, and the mounting component is provided with at least two mounting rods. At least one mounting rod is located on the base and forms a clearance space with the base. The seat cushion structure can be hung on any of the mounting rods.

18. The seat unit according to claim 16, characterized in that, A fixing plate is provided below the base, and an mounting plate is provided between the fixing plate and the lower end face of the base. The drive device is rotatably connected to the mounting plate.

19. The seat unit according to claim 16, characterized in that, The mounting section includes a mounting channel and a hook, and the seat unit also includes an elastic element, one end of which is mounted on the mounting channel and the other end of which is mounted on the hook.

20. The seat unit according to any one of claims 1-15, characterized in that, The drive unit is located at an eccentric position on the base.

21. The seat unit according to any one of claims 1-15, characterized in that, 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.

22. The seat unit according to claim 21, characterized in that, 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.

23. The seat unit according to any one of claims 1-15, characterized in that, The track includes inclined sections and straight sections, with a circular arc transition between the inclined and straight sections. When the guide is located at the circular arc transition between the inclined and straight sections, the guide is interference-fitted with the track. Specifically, when the mechanical extension structure is in a seated position, 5° < the angle between the inclined section and the upper surface of the base < 45°; when the mechanical extension structure is in a lying position, 3° ≤ the angle between the upper surface of the base and the horizontal plane < 10°.

24. The seat unit according to any one of claims 2-15, characterized in that, 1°≤The angle between the first track and the upper surface of the base≤8°.

25. A sofa, characterized in that, The seat unit includes any one of claims 1-24, and the drive device includes: The driver is movably mounted on the base or pedestal; A drive lever, which is movably mounted on the driver; The connecting structure is fixedly connected to the leg assembly and rotatably connected to the base. The connecting structure includes a swing plate that is rotatably connected to the drive rod. During the transformation of the mechanical extension structure between a sitting position and a lying position, the drive rod drives the connecting structure to rotate relative to the base through the swing plate.

26. The sofa according to claim 25, characterized in that, The connecting structure includes at least one connecting rod rotatably connected to the base, and the swing plate is fixedly connected to the connecting rod; 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.

27. The sofa according to claim 26, characterized in that, The hardness of the support block is less than the hardness of the base, the hardness of the support block is less than the hardness of the connecting rod, and the distance between the support block and the connecting rod is less than the width of the connecting rod.

28. The sofa according to claim 26, characterized in that, The connecting rod is a circular connecting rod, and the support block has an arc-shaped groove corresponding to the connecting rod, with at least part of the connecting rod inserted into the arc-shaped groove.

29. The sofa according to claim 25, characterized in that, The mechanical extension structure also includes a swing mechanism. The leg assembly, base, and base are movably connected to the swing mechanism. When the mechanical extension structure is in a sitting position, the swing plate and the swing mechanism are both located above the lower end face of the base. When the mechanical extension structure is in a lying position, the swing plate and the swing mechanism are both located above the lower end face of the base. The base is equipped with a support rod, the height of which is ≥8mm.

30. The sofa according to claim 25, characterized in that, The 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. Alternatively, the 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 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. Alternatively, the 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. Alternatively, the 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.

31. The sofa according to claim 30, characterized in that, The thickness of the backrest panel is less than 3mm, and the backrest panel has several outwardly extending protrusions, the thickness of which is greater than 3mm.

32. The sofa according to claim 30, characterized in that, During the transition between a sitting and reclining position, the front support of the backrest can compress the side wall of the seat cushion structure, causing the seat cushion structure to deform elastically and indent inward.

33. The sofa according to claim 32, characterized in that, 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.

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