Seat unit and sofa

Abstract

The utility model relates to a seat unit and a sofa, and solves the problem of poor user experience. The seat unit comprises a backrest structure, a seat cushion structure and a mechanical stretching structure, the mechanical stretching structure comprises a base, a base, two backrest assemblies, two leg assemblies and a driving device, the seat cushion structure is fixedly connected with the base, the backrest structure is movably arranged behind the base through the backrest assemblies, the leg assemblies are movably arranged in front of the base, and the driving device is fixedly connected with the base. The driving device is arranged on the leg component; the mechanical stretching structure has a sitting posture position and a lying posture position; the mechanical stretching structure further comprises a guide piece and a rail, one of the guide piece and the rail is fixedly connected with the base, the other one is fixedly connected with the base, and the guide piece is inserted into the rail. The base and / or the track are / is provided with a first limiting structure which is used for preventing the guiding piece from sliding out of the track and is separated from the track, and the guiding piece slides along the track in the process that the mechanical stretching structure is switched between the sitting posture position and the lying posture position.

Description

Technical Field

[0001] The utility model relates to a seat unit and a sofa. Background Art

[0002] The seat unit includes a base, a pedestal and a mechanical extension structure, the mechanical extension structure having a sitting position and a lying position, and during the transformation of the mechanical extension structure between the sitting position and the lying position, the pedestal moves forward and backward relative to the pedestal.

[0003] The mechanical extension structure includes a roller, which is rotatably connected to the base. When the mechanical extension structure changes between a sitting position and a lying position, the roller rolls along the base to realize the forward and backward movement of the base relative to the base. When the roller is rotatably connected to the base, the seat unit has the following disadvantages: 1. The roller is prone to make noise when rolling along the base; 2. When foreign matter adheres to the surface of the roller, the roller is prone to vibrate when rolling along the base; 3. When there are cracks or damage on the surface of the roller, the roller is prone to eccentric rolling when rolling along the base.

[0004] The above problems may result in a poor user experience of the seat unit during the forward and backward movement of the base relative to the base. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a seat unit and a sofa, which solves the problem of poor user experience.

[0006] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] The seat unit comprises a backrest structure, a cushion structure and a mechanical extension structure, wherein the mechanical extension structure comprises a base, a base, two sets of backrest components, two sets of leg components and a driving device, wherein the cushion structure is fixedly connected to the base, the backrest structure is movably arranged at the rear of the base through the backrest component, the leg component is movably arranged at the front of the base, and the driving device is arranged at the leg component;

[0008] The mechanical extension structure has a sitting position and a lying position. When the mechanical extension structure is changed from the sitting position to the lying position, the driving device drives the base to move forward through the leg assembly, so that the leg assembly is extended in front of the base and the backrest assembly is tilted back relative to the base; when the mechanical extension structure is changed from the lying position to the sitting position, the driving device drives the base to move backward through the leg assembly, so that the leg assembly is folded under the base and the backrest assembly is returned to the normal position relative to the base.

[0009] The mechanical extension structure also includes a guide and a track, one of which is fixedly connected to the base, and the other is fixedly connected to the base, and the guide is inserted into the track; the base and / or the track is provided with a first limiting structure for preventing the guide from sliding out of the track and separating from the track, and the guide slides along the track during the transformation of the mechanical extension structure between a sitting position and a lying position.

[0010] In the utility model, the mechanical extension structure further comprises a guide member and a track, wherein the guide member is inserted into the track, and when the mechanical extension structure is transformed between a sitting position and a lying position, the guide member slides along the track.

[0011] The advantages of the guide sliding along the track include: 1. The guide is fixedly connected to the base or the pedestal, so it is difficult for the guide and the pedestal (or the pedestal) to generate movement noise during the guide sliding along the track; 2. The surface of the guide (the guide surface is the surface of the guide in contact with the pedestal) is shielded by the track, so it is difficult for foreign objects to actively fall onto its surface, that is, it is difficult for foreign objects to adhere to the surface of the guide in contact with the pedestal; 3. The gravity of the guide is downward, and the gravity of the damaged guide is still downward, so regardless of whether the guide is damaged, its center of gravity will not shift during the guide sliding along the track. In other words, the "guide sliding" technology effectively overcomes problems such as rolling noise, foreign object attachment, and eccentric rolling, so as to improve the user experience, especially the user experience during the operation of the seat unit (the operation of the seat unit is the process of the base moving back and forth relative to the pedestal).

[0012] In the prior art, in order to prevent the guide member from sliding out of the track, the length of the track can be increased; while the utility model chooses to set a first limiting structure on the track (or chooses to set a first limiting structure on the base, or chooses to set a first limiting structure on the base and the track), and the first limiting structure is used to prevent the guide member from sliding out of the track and separating from the track; that is, the first limiting structure uses a physical structure to prevent the guide member from derailing, so as to improve the reliability of the seat unit during operation.

[0013] Preferably, the guide member includes a fixed rod and a sliding rod, the fixed rod is fixedly connected to the base, the track is fixedly connected to the base, the fixed rod and the track are respectively slidably connected to the sliding rod, and during the transformation of the mechanical extension structure between a sitting position and a lying position, the fixed rod slides along the track through the sliding rod, and the sliding rod is provided with a limiting portion that can be used to abut against the first limiting structure, and the hardness of the limiting portion is different from that of the first limiting structure.

[0014] Since the hardness of the limiting part is different from that of the first limiting structure, when the limiting part abuts against the first limiting structure, the limiting part is used to remove part of the impact force of the sliding rod hitting the first limiting structure, so as to further improve the user experience during the operation of the seat unit.

[0015] Preferably, a second limiting structure is provided on the fixing rod to prevent the sliding rod from sliding out of the fixing rod and separating from the fixing rod.

[0016] When the guide member includes a fixed rod and a sliding rod, the sliding rod is used to increase the range of motion of the base relative to the base; and the second limiting structure is used in conjunction with the first limiting structure to limit the maximum distance that the guide member can move relative to the track.

[0017] Preferably, the hardness of the second limiting structure is different from that of the limiting portion, and when the fixed rod and the track are respectively slidably connected to the sliding rod, the limiting portion can be clamped between the first limiting structure and the second limiting structure.

[0018] When the limiting portion is clamped between the first limiting structure and the second limiting structure, it can be observed whether the guide member and the track are assembled according to the specification.

[0019] Since the hardness of the limiting part is different from that of the second limiting structure, when the limiting part abuts against the second limiting structure, the limiting part is used to remove part of the impact force of the sliding rod hitting the second limiting structure, so as to further improve the user experience during the operation of the seat unit.

[0020] Preferably, the track is fixedly connected to the base, a slide groove is provided on the track, the guide member can be inserted into the slide groove, the slide groove includes a first guide surface and a second guide surface corresponding to the first guide surface, and during the transformation of the mechanical extension structure between a sitting position and a lying position, the guide member can slide along the first guide surface or the second guide surface to make the base slide along the base.

[0021] According to the fact that “the guide member can slide along the first guide surface or the second guide surface during the transformation of the mechanical extension structure between the sitting position and the lying position”, it is not difficult to conclude that at least part of the guide member is clearance-matched with the slide groove; that is, during the transformation of the mechanical extension structure between the sitting position and the lying position, the guide member will not have an interference fit with the track throughout the entire process. This structure can effectively reduce the friction of the guide member during the movement of the guide member along the track.

[0022] In the prior art, the mechanical extension structure includes a guide, which is usually a slider. The base is provided with a track, and the guide is inserted into the track. The guide and the track are interference fit. When the mechanical extension structure changes between the sitting position and the lying position, the guide slides along the track to achieve the forward and backward movement of the base relative to the base. Although the "interference fit between the guide and the track" increases the stability of the base during the forward and backward movement relative to the base; however, the "interference fit between the guide and the track" also increases the friction during the sliding of the guide relative to the track.

[0023] Preferably, a mounting opening is provided on the base, and an extension ring is provided on the base around the mounting opening. The hardness of the track is less than the hardness of the extension ring. The track is inserted into the extension ring through the mounting opening. When the track is inserted into the extension ring, the track passes through the extension ring.

[0024] The extension ring increases the contact area between the base and the track to improve the connection strength between the track and the base. In addition, since the hardness of the track is lower than that of the extension ring, the track can be deformed during the installation process to reduce the difficulty of installing the track.

[0025] Preferably, the guide member includes a slide bar and an annular gasket, the hardness of the annular gasket is less than the hardness of the extension ring, and the slide bar sequentially passes through the track and the annular gasket and is fixedly connected to the base;

[0026] When the slide bar passes through the track and the annular gasket in sequence and is fixedly connected to the base, the annular gasket can abut against the track.

[0027] The advantages of the annular gasket include: 1. The annular gasket increases the connection strength between the sliding rod and the base; 2. When the sliding rod passes through the track and the annular gasket in sequence and is fixedly connected to the base, the annular gasket prevents the track from directly contacting the base and thereby scratching the base; 3. The replacement cost of the annular gasket is low; 4. The annular gasket and the track are plastic parts, and both can reduce the assembly accuracy requirements between the base and the base; even if the annular gasket and the track are not plastic parts, since "the hardness of the track is less than the hardness of the extension ring" and "the hardness of the annular gasket is less than the hardness of the extension ring", the annular gasket and the track can also reduce the assembly accuracy requirements between the base and the base.

[0028] Preferably, the slide rod is threadedly connected to the base; and / or, a plurality of convex ribs protruding outward are provided on the outer peripheral side of the track, and the track is inserted into the base. When the track is inserted into the base, the track abuts against the base through the convex ribs.

[0029] The slide bar is threadedly connected to the base, which is convenient for disassembly and replacement. The outer circumference of the track is provided with a number of convex ribs, which can effectively solve the problem that the track cannot be assembled in place due to different material thickness.

[0030] Preferably, when the slide rod is threadedly connected to the base, the threaded connection between the slide rod and the base is filled with adhesive; and / or, when the slide rod is threadedly connected to the base, the slide rod contacts the track surface.

[0031] The adhesive is used to further increase the connection strength between the slide bar and the base to prevent the slide bar from loosening after rotating relative to the base. The contact between the slide bar and the track surface effectively prevents the slide bar from rotating relative to the base.

[0032] Preferably, a mounting opening is provided on the base, and an extension ring is provided on the base around the mounting opening, the hardness of the track is less than the hardness of the extension ring, and the track is inserted into the extension ring through the mounting opening. When the track is inserted into the extension ring, the track does not penetrate the extension ring.

[0033] Since the track does not pass through the extension ring, the extension ring located in the track will not collide with the base; that is, during the forward and backward movement of the base, this structure effectively reduces the probability of the base hitting the track, thereby reducing the probability of the track being displaced relative to the base.

[0034] Preferably, the guide member includes a slide bar and an annular gasket, the hardness of the annular gasket is less than the hardness of the extension ring, and the slide bar sequentially passes through the track and the annular gasket and is fixedly connected to the base;

[0035] When the slide bar passes through the track and the annular gasket in sequence and is fixedly connected to the base, the annular gasket can abut against the extension ring.

[0036] The ring gasket is used to protect the base and prevent the base from being scratched by the extension ring.

[0037] Preferably, the slide rod is threadedly connected to the base; and / or, a plurality of convex ribs protruding outward are provided on the outer peripheral side of the track, and the track is inserted into the base. When the track is inserted into the base, the track abuts against the base through the convex ribs.

[0038] Preferably, the drive device is movably arranged on the base or the chassis.

[0039] Preferably, the driving device comprises:

[0040] A driver, the driver being movably disposed on a base or a chassis;

[0041] A driving rod, the driving rod is movably disposed on the driver;

[0042] A connecting structure, the connecting structure is fixedly connected to the leg assembly, the connecting structure is rotatably connected to the base, and the connecting structure includes a swing plate rotatably connected to the driving rod; during the transformation of the mechanical extension structure between a sitting position and a lying position, the driving rod drives the connecting structure to rotate relative to the base through the swing plate.

[0043] In the prior art, the mechanical extension structure is provided with two groups of leg assemblies, and the two groups of leg assemblies are connected by a connecting structure. The connecting structure is rotatably connected to the driving rod on the driver, but the existing connecting structure is not rotatably connected to the base. That is to say: in the process of the leg assembly extending in front of the base (or the leg assembly being retracted under the base), the connecting structure is suspended in the air throughout the process; at this time, the force required for the leg assembly to move relative to the base is directly provided by the connecting structure.

[0044] The connecting structure is fixed to the leg assembly. During the transformation of the mechanical extension structure between the sitting position and the lying position, the driving rod drives the connecting structure to rotate relative to the base through the swing plate, so that the connecting structure drives the leg assembly to extend in front of the base or to be retracted under the base.

[0045] In the utility model, since the connecting mechanism is rotatably connected to the base, the base provides support force for the connecting mechanism throughout the process of the leg assembly extending in front of the base (or the leg assembly being retracted under the base); this means that, during the process of the leg assembly extending in front of the base (or the leg assembly being retracted under the base), the base can weaken at least part of the torque required for the connecting mechanism to drive the leg assembly.

[0046] 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;

[0047] At least one supporting block is disposed on the base, at least one connecting rod is located below one supporting block, and the base can abut against the connecting rod through the supporting block; and / or at least part of the supporting block is located between the side wall of the base and the side wall of the connecting rod.

[0048] When the base is hit by an external force, the base can transfer part of the impact force to the connecting rod through the support block to improve the base's ability to resist deformation; if the connecting rod is located below the support block, the connecting rod can absorb the impact force from the top of the base; if the connecting rod is located on the side wall of the base, the connecting rod 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 hit by an external force.

[0049] 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 spacing distance between the support block and the connecting rod is less than the width of the connecting rod.

[0050] When the hardness of the support block is less than the hardness of the base, and the hardness of the support block is less than the hardness of the connecting rod, the support block can absorb part of the impact force from the external object through its own deformation, thereby further reducing the deformation amplitude of the base after being hit by the external force. When the hardness of the support block is less than the hardness of the base, and the hardness of the support block is less than the hardness of the connecting rod, after being hit by the external force, 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.

[0051] Preferably, the connecting rod is a circular connecting rod, and the supporting block is provided with an arc-shaped groove corresponding to the connecting rod, and at least part of the connecting rod is inserted into the arc-shaped groove. The arc-shaped groove is used to limit the position of the connecting rod on the supporting block and increase the contact area between the connecting rod and the supporting block; this structure prevents the supporting block from sliding along the connecting rod and separating from the connecting rod after the base is hit by an external force, that is, ensuring the reliability of the working of the supporting block.

[0052] Preferably, when the mechanical extension structure is in the sitting position, the guide member is located at P1; when the mechanical extension structure is in the lying position, the guide member is located at P2;

[0053] The rotational connection between the swing plate and the driving rod is the first transfer point. When the mechanical extension structure is in a sitting position, the first transfer point is located at P3; when the mechanical extension structure is in a lying position, the first transfer point is located at P4; the straight-line distance between P1 and P2 is less than the straight-line distance between P3 and P4.

[0054] It is not difficult to infer that “the straight-line distance between P1 and P2 is less than the straight-line distance between P3 and P4”: the length of the track 162 and the length of the swing plate determine the extended length of the leg assembly.

[0055] Preferably, the track includes an inclined section and a straight section, and the inclined section and the straight section have an arc transition. When the mechanical extension structure is in a sitting position, the angle between the inclined section and the upper end surface of the base is 5°<45°; when the mechanical extension structure is in a lying position, the angle between the upper end surface of the base and the horizontal plane is 3°≤10°.

[0056] After a lot of market research, it is concluded that when 3°≤the angle between the upper end surface of the base and the horizontal plane is <10°, the angle at which the user lies on the seat unit is most comfortable. Since the movement distance of the guide is controlled by the swing plate, in order to enable the base to move to the most comfortable angle of the seat unit within a limited track travel, the track of the utility model includes an inclined section, and the inclined section is set to a specific inclined angle (specific inclined angle: 5°<the angle between the inclined section and the upper end surface of the base<45°), so as to enable the base to move to the most comfortable angle of the seat unit within a limited track travel.

[0057] Preferably, 7 cm < swing plate < 30 cm, and the swing plate is located above the lower end surface of the base during the mechanical extension structure changes between the sitting position and the lying position. This structure reduces the probability of the swing plate colliding with external objects during transportation, especially when the seat unit is removed from the support rod, wherein the support rod is arranged below the base to support the seat unit.

[0058] Preferably, the mechanical extension structure further comprises a swing mechanism, and the leg assembly, the base and the base are respectively movably connected to the swing mechanism. When the leg assembly, the base and the base are respectively movably connected to the swing mechanism, the leg assembly can drive the base to move relative to the base through the swing mechanism.

[0059] Preferably, during the transformation of the mechanical extension structure between the sitting position and the lying position, at least part of the swing mechanism can move to the bottom of the base. This structure increases the length of the swing mechanism to increase the range of motion of the base relative to the base within a limited space of the seat unit (especially within a limited front-to-back length of the seat unit).

[0060] Preferably, the swing mechanism includes a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod is rotatably connected to the base, one end of the third connecting rod is rotatably connected to the leg assembly, the second connecting rod is rotatably connected to the base, the other end of the first connecting rod is rotatably connected to one end of the second connecting rod, and the other end of the third connecting rod is rotatably connected to the other end of the second connecting rod. This structure simplifies the swing mechanism.

[0061] Preferably, the distance between the second link and the base rotation connection and the first link and the second link rotation connection is greater than the distance between the second link and the base rotation connection and the third link and the second link rotation connection. "The distance between the second link and the base rotation connection and the first link and the second link rotation connection is greater than the distance between the second link and the base rotation connection and the third link and the second link rotation connection" is used to adjust the difficulty of extending the leg assembly. When the distance between the second link and the base rotation connection and the first link and the second link rotation connection is greater than the distance between the second link and the base rotation connection and the third link and the second link rotation connection, the movement speed of the leg assembly during the mechanical extension structure changes from a sitting position to a lying position will slow down. This structure makes it convenient for users to adjust the seat unit to a suitable angle.

[0062] The sofa includes a seat unit described in any of the above technical solutions, and the leg assembly includes a main legrest mounting plate, a front legrest rotating plate, a rear legrest rotating plate, a front legrest connecting plate and a rear legrest connecting plate, one end of the front legrest rotating plate and one end of the rear legrest rotating plate are respectively rotatably connected to the main legrest mounting plate, the other end of the front legrest rotating plate is rotatably connected to one end of the front footrest connecting plate, the other end of the rear legrest rotating plate is rotatably connected to one end of the rear legrest connecting plate, the front footrest connecting plate is rotatably connected to the rear legrest rotating plate, and the other end of the front legrest connecting plate and the other end of the rear legrest connecting plate are respectively rotatably connected to the base.

[0063] Preferably, the backrest assembly comprises a backrest plate, a backrest front bracket, a backrest rear bracket and a linkage bracket, the backrest plate is arranged on the backrest structure, one end of the backrest front bracket and one end of the backrest rear bracket are respectively rotatably connected to the backrest plate, and the other end of the backrest front bracket and the other end of the backrest rear bracket are respectively rotatably connected to the base;

[0064] One end of the linkage bracket is rotatably connected to the base, and the other end of the linkage bracket is rotatably connected to the front bracket of the backrest or the rear bracket of the backrest.

[0065] Preferably, the rear support bracket includes a widened portion, the length of the widened portion is ≥5cm, and the other end of the linkage bracket is rotatably connected to the rear support bracket.

[0066] The widened portion is used to increase the installation space of the linkage bracket on the rear backrest bracket to avoid that the deformation resistance of the rear backrest bracket is seriously weakened after the linkage bracket is rotatably connected with the rear backrest bracket.

[0067] Preferably, when the other end of the linkage bracket is rotatably connected to the backrest bracket, the rotational connection point between the other end of the linkage bracket and the backrest bracket is the second transfer point, and the rotational connection point between one end of the backrest bracket and the backrest board is the third transfer point;

[0068] When the mechanical extension structure is in the sitting position, the second transfer point is located below the third transfer point; when the mechanical extension structure is in the lying position, the second transfer point is located above the third transfer point.

[0069] Preferably, one end of the linkage bracket is rotatably connected to the side wall of the base. This structure increases the anti-deformation strength of the base.

[0070] Preferably, when the other end of the linkage bracket is rotationally connected to the front backrest bracket, the rotation connection point between the other end of the linkage bracket and the front backrest bracket is the fourth transfer point, and the rotation connection point between one end of the front backrest bracket and the backrest board is the fifth transfer point;

[0071] When the mechanical extension structure is in the sitting position, the fourth transfer point is located below the fifth transfer point; when the mechanical extension structure is in the lying position, the fourth transfer point is located above the fifth transfer point.

[0072] Preferably, one end of the linkage bracket is rotatably connected to the side wall of the base.

[0073] Preferably, when the mechanical extension structure is in the sitting position, the backrest front bracket and the cushion structure are in clearance fit; and / or, when the mechanical extension structure is in the lying position, the backrest front bracket and the cushion structure are in clearance fit. This structure prevents the backrest front bracket from scratching the cushion decoration cover (the cushion decoration cover includes cowhide and technological cloth) on the cushion structure; when one end of the linkage bracket is rotatably connected to the side wall of the base, and the backrest front bracket and the cushion structure are in clearance fit, since the linkage bracket blocks the top of the backrest front bracket, the user's hand will not be clamped between the backrest front bracket and the base unless the user intentionally puts the hand deep between the linkage bracket and the backrest front bracket.

[0074] Preferably, the thickness of the backrest board is less than 3 mm, and a plurality of protrusions extending outward are provided on the backrest board, and the thickness of the protrusions is greater than 3 mm. This structure ensures the anti-deformation strength of the backrest board while reducing the manufacturing cost of the backrest board.

[0075] Preferably, the backrest assembly includes a backrest plate, a front backrest bracket, a backrest bracket and a linkage bracket, the backrest plate is arranged on the backrest structure, one end of the front backrest bracket and one end of the backrest bracket are respectively rotatably connected to the backrest plate, the other end of the backrest bracket is rotatably connected to the base, the front backrest bracket is also rotatably connected to the base, one end of the linkage bracket is rotatably connected to the other end of the front backrest bracket, and the other end of the linkage bracket is rotatably connected to the backrest bracket.

[0076] Preferably, the driving device is arranged at an eccentric position of the base.

[0077] In the prior art, the driving rod of the seat unit is located in the middle of the base; a serpentine spring is arranged on the base, and the serpentine spring is used to support the cushion structure. At least part of the cushion structure is arranged above the serpentine spring. After the user sits on the cushion structure, the cushion structure transmits the user's gravity to the serpentine spring to cause the serpentine spring to elastically deform. However, the user found that when the driving rod of the seat unit is located in the middle of the base, the elastically deformed serpentine spring may abut against the driving rod. Therefore, the utility model arranges the driving device at an eccentric position of the base to further reduce the probability of the serpentine spring contacting the driving rod.

[0078] Preferably, the track is snap-connected to the base; and / or the track is connected to the base via fasteners.

[0079] Preferably, a buffer pad is provided on the track, the hardness of the buffer pad is less than the hardness of the first limiting structure, and when the mechanical extension structure is in the sitting position, the guide member does not abut against the buffer pad; when the mechanical extension structure is in the lying position, the buffer pad is sandwiched between the guide member and the first limiting structure;

[0080] During the transformation of the mechanical extension structure from the lying position to the sitting position, the seat cushion structure abuts against the backrest structure, and the seat cushion structure and / or the backrest structure undergo elastic deformation.

[0081] Since the seat cushion structure squeezes the backrest structure during the process of the mechanical extension structure changing from a lying position to a sitting position; therefore, when the mechanical extension structure is in the sitting position, the first limiting structure does not need to remove the force of the guide member, and the backrest structure has already removed the force of the guide member; that is, when the mechanical extension structure is in the sitting position, the guide member does not need to counteract the buffer pad; wherein, the force of the guide member is generated during the guide member sliding along the track. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 It is a three-dimensional diagram of the first structure of the mechanical extension structure in the utility model;

[0083] Figure 2 It is a three-dimensional diagram of the first structure of the sliding mechanism in the utility model;

[0084] Figure 3 It is a front view of the seat unit in the utility model (the first mechanical extension structure is located in the sitting position);

[0085] Figure 4 It is a front view of the first structure of the mechanical extension structure in the utility model (the mechanical extension structure is located in a lying position);

[0086] Figure 5 It is a three-dimensional diagram of the second structure of the mechanical extension structure in the utility model;

[0087] Figure 6 It is a front view of the second structure of the mechanical extension structure in the utility model (the mechanical extension structure is located in a sitting position);

[0088] Figure 7 It is a three-dimensional diagram of the first structure of the mechanical extension structure in the utility model (the mechanical extension structure is located in a lying position);

[0089] Figure 8 It is a cross-sectional view of the first structure of the sliding mechanism in the utility model;

[0090] Fig. 9 It is a cross-sectional view of the second structure of the sliding mechanism in the utility model;

[0091] Fig.10 It is a cross-sectional view of the connecting rod, the supporting block and part of the base in the utility model. DETAILED DESCRIPTION

[0092] The present invention is further described in detail below through specific implementation examples and in conjunction with the accompanying drawings:

[0093] like Figure 1 and Figure 5 As shown, the utility model discloses a seat unit including a backrest structure 100, a cushion structure 200 and a mechanical extension structure 1, wherein the mechanical extension structure 1 includes a base 11, a base 12, two groups of backrest components 13, two groups of leg components 14 and a driving device 15, the cushion structure 200 is fixedly connected to the base 11, the backrest structure 100 is movably arranged at the rear of the base 11 through the backrest component 13, the leg component 14 is movably arranged at the front of the base 11, and the driving device 15 is arranged at the leg component 14;

[0094] The mechanical extension structure 1 has a sitting position and a lying position, such as Figure 3 and Figure 6 As shown, the mechanical extension structure 1 is in a sitting position; Figure 4 and Figure 7As shown, the mechanical extension structure 1 is in a lying position. When the mechanical extension structure 1 is transformed from a sitting position to a lying position, the driving device 15 drives the base 11 to move forward through the leg assembly 14, so that the leg assembly 14 is extended in front of the base 11 and the backrest assembly 13 is tilted back relative to the base 11; when the mechanical extension structure 1 is transformed from a lying position to a sitting position, the driving device 15 drives the base 11 to move backward through the leg assembly 14, so that the leg assembly 14 is folded under the base 11 and the backrest assembly 13 is straightened relative to the base 11.

[0095] like Figure 1 and Figure 5 As shown, the mechanical extension structure 1 also includes a guide 161 and a track 162, one of which is fixedly connected to the base 11, and the other is fixedly connected to the base 12, and the guide 161 is inserted into the track 162; the base 11 and / or the track 162 is provided with a first limiting structure 1621 for preventing the guide 161 from sliding out of the track 162 and separating from the track 162, and when the mechanical extension structure 1 is transformed between a sitting position and a lying position, the guide 161 slides along the track 162.

[0096] In the utility model, the mechanical extension structure 1 also includes a guide member 161 and a track 162. The guide member 161 is inserted into the track 162. When the mechanical extension structure 1 is transformed between a sitting position and a lying position, the guide member 161 slides along the track 162 to replace the "roller rolling" technology in the prior art with the "guide member sliding" technology.

[0097] The advantages of the guide member 161 sliding along the track 162 include: 1. The guide member 161 is fixedly connected to the base 11 or the base 12. Therefore, during the sliding of the guide member 161 along the track 162, it is difficult for movement noise to be generated between the guide member 161 and the base 11 (or the base 12); 2. The surface of the guide member 161 (the surface of the guide member 161 is the surface of the guide member 161 in contact with the base 11) is shielded by the track 162. Therefore, it is difficult for foreign objects to actively fall onto its surface, that is, it is difficult for foreign objects to adhere to the surface of the guide member 161 in contact with the base 11; 3. The gravity of the guide member 161 is downward, and the gravity of the damaged guide member 161 is still downward. Therefore, regardless of whether the guide member 161 is damaged, its center of gravity will not shift during the sliding of the guide member 161 along the track 162. In other words, the "guide 161 sliding" technology effectively overcomes problems such as rolling noise, attachment of foreign matter, and eccentric rolling, so as to improve the user experience, especially the user experience during the operation of the seat unit (the operation of the seat unit is the process in which the base moves back and forth relative to the base).

[0098] In the prior art, in order to prevent the guide member from sliding out of the track, the length of the track can be increased; while the present invention chooses to set a first limiting structure 1621 on the track 162 (or chooses to set the first limiting structure 1621 on the base 11, or chooses to set the first limiting structure 1621 on the base 11 and the track 162). The first limiting structure 1621 is used to prevent the guide member 161 from sliding out of the track 162 and separating from the track 162; that is, the first limiting structure 1621 uses a physical structure to prevent the guide member 161 from derailing, so as to improve the reliability of the seat unit during operation.

[0099] In the present invention, the sliding mechanism 16 includes a guide 161 and a track 162, wherein the guide 161 includes two structures. The guide 161 of the first structure is as follows: Figure 2 As shown, the guide member 161 of the second structure is as follows Figure 5 shown.

[0100] like Figure 2 As shown, the first guide member 161 includes a fixed rod 1611 and a sliding rod 1612. The fixed rod 1611 is fixedly connected to the base 11, and the track 162 is fixedly connected to the base 12. The fixed rod 1611 and the track 162 are respectively slidably connected to the sliding rod 1612. During the transformation of the mechanical extension structure 1 between a sitting position and a lying position, the fixed rod 1611 slides along the track 162 through the sliding rod 1612. The sliding rod 1612 is provided with a limiting portion 16121 that can be used to abut against the first limiting structure 1621. The hardness of the limiting portion 16121 is different from the hardness of the first limiting structure 1621.

[0101] Preferably, the track 162 is made of metal, and the first limiting structure 1621 is a first limiting block extending inward from the track 162. Figure 2 As shown, the sliding rod 1612 is made of plastic, and there are two sliding rods 1612. Of course, the sliding rod of the utility model can be one, and the limiting part of the sliding rod is made of plastic.

[0102] In addition, the first limiting structure 1621 can be integrally formed with the track 162, such as Figure 6 shown.

[0103] Since the hardness of the limiting portion 16121 is different from the hardness of the first limiting structure 1621, when the limiting portion 16121 abuts against the first limiting structure 1621, the limiting portion 16121 is used to remove part of the impact force of the sliding rod 1612 hitting the first limiting structure 1621, so as to further improve the user experience during the operation of the seat unit.

[0104] like Figure 2As shown, the fixing rod 1611 is provided with a second limiting structure 16111 for preventing the sliding rod 1612 from sliding out of the fixing rod 1611 and separating from the fixing rod 1611 .

[0105] When the guide member 161 includes a fixed rod 1611 and a sliding rod 1612, the sliding rod 1612 is used to increase the range of motion of the base 11 relative to the base 12; and the second limiting structure 16111 is used in conjunction with the first limiting structure 1621 to limit the maximum distance that the guide member 161 can move relative to the track 162.

[0106] In the present invention, the hardness of the second limiting structure 16111 is different from that of the limiting portion 16121 . When the fixing rod 1611 and the track 162 are respectively slidably connected to the sliding rod 1612 , the limiting portion 16121 can be clamped between the first limiting structure 1621 and the second limiting structure 16111 .

[0107] When the limiting portion 16121 is clamped between the first limiting structure 1621 and the second limiting structure 16111 , it can be observed whether the guide member 161 and the track 162 are assembled according to the specification.

[0108] Since the hardness of the limiting portion 16121 is different from the hardness of the second limiting structure 16111, when the limiting portion 16121 abuts against the second limiting structure 16111, the limiting portion 16121 is used to remove part of the impact force of the sliding rod 1612 hitting the second limiting structure 16111, so as to further improve the user experience during the operation of the seat unit.

[0109] Preferably, the second limiting structure 16111 is a second limiting block formed by the fixing rod 1611 extending downward.

[0110] like Figure 6 As shown, the track 162 is fixedly connected to the base 12, and a slide groove 1622 is provided on the track 162. The guide member 161 can be inserted into the slide groove 1622. The slide groove 1622 includes a first guide surface 16221 and a second guide surface 16222 corresponding to the first guide surface 16221. When the mechanical extension structure 1 is transformed between a sitting position and a lying position, the guide member 161 can slide along the first guide surface 16221 or the second guide surface 16222 to make the base 11 slide along the base 12.

[0111] According to “the guide member 161 can slide along the first guide surface 16221 or the second guide surface 16222 during the transformation of the mechanical extension structure 1 between the sitting position and the lying position”, it is not difficult to conclude that at least part of the guide member 161 is in clearance fit with the slide groove 1622, such as Figure 8As shown; that is, during the transformation of the mechanical extension structure 1 between the sitting position and the lying position, the guide member 161 will not have an interference fit with the track 162 throughout the entire process.

[0112] The structure that "the guide member 161 will not be in interference fit with the track 162 throughout the entire process" reduces the extrusion force between the guide member 161 and the track 162, thereby reducing the friction force during the movement of the guide member 161 along the track 162. After the friction force during the movement of the guide member 161 along the track 162 is reduced, the speed of the base 11 moving forward and backward relative to the base 12 can be correspondingly improved, thereby solving the problem of the slow forward and backward movement speed of the base 11 relative to the base 12.

[0113] In the prior art, the mechanical extension structure includes a guide, which is usually a slider. The base is provided with a track, and the guide is inserted into the track. The guide and the track are interference fit. When the mechanical extension structure changes between the sitting position and the lying position, the guide slides along the track to achieve the forward and backward movement of the base relative to the base. Although the "interference fit between the guide and the track" increases the stability of the base during the forward and backward movement relative to the base; however, the "interference fit between the guide and the track" also increases the friction during the guide sliding relative to the track; however, when the friction during the guide sliding along the track becomes larger, the speed of the base moving forward and backward relative to the base will be slowed down.

[0114] like Figure 8 As shown, a mounting opening 120 is provided on the base 12, and an extension ring 121 is provided on the base 12 around the mounting opening 120, the hardness of the track 162 is less than the hardness of the extension ring 121, and the track 162 is inserted into the extension ring 121 through the mounting opening 120. When the track 162 is inserted into the extension ring 121, the track 162 passes through the extension ring 121.

[0115] The extension ring 121 increases the contact area between the base 12 and the track 162 to improve the connection strength between the track 162 and the base 12. In addition, since the hardness of the track 162 is lower than that of the extension ring 121, the track 162 can be deformed during the installation process to reduce the difficulty of installing the track 162.

[0116] like Figure 8 As shown, the guide member 161 includes a slide bar 1613 and an annular gasket 1614. The hardness of the annular gasket 1614 is less than the hardness of the extension ring 121. The slide bar 1613 sequentially passes through the track 162 and the annular gasket 1614 and is fixedly connected to the base 11.

[0117] When the sliding rod 1613 passes through the track 162 and the annular gasket 1614 in sequence and is fixedly connected to the base 11 , the annular gasket 1614 can abut against the track 162 .

[0118] The advantages of the annular gasket 1614 include: 1. The annular gasket 1614 increases the connection strength between the slide bar 1613 and the base 11; 2. When the slide bar 1613 sequentially passes through the track 162 and the annular gasket 1614 and is fixedly connected to the base 11, the annular gasket 1614 prevents the track 162 from directly contacting the base 11, thereby scratching the base 11; 3. The replacement cost of the annular gasket 1614 is low; 4. The annular gasket 1614 and the track 162 are plastic parts, and the two can reduce the assembly accuracy requirements of the base 11 and the base 12; even if the annular gasket 1614 and the track 162 are not plastic parts, since "the hardness of the track 162 is less than the hardness of the extension ring 121" and "the hardness of the annular gasket 1614 is less than the hardness of the extension ring 121", the annular gasket 1614 and the track 162 can also reduce the assembly accuracy requirements of the base 11 and the base 12.

[0119] In the present invention, the concept of "and / or" means: choose one of the two, or choose both.

[0120] Preferably, the slide bar 1613 is threadedly connected to the base 11; and / or, the outer peripheral side of the track 162 is provided with a plurality of convex ribs (not marked) protruding outward, and the track 162 is inserted into the base 12. When the track 162 is inserted into the base 12, the track 162 abuts against the base 12 through the convex ribs. The slide bar 1613 is threadedly connected to the base 11, and this structure facilitates the disassembly and replacement of the slide bar 1613. The outer peripheral side of the track 162 is provided with a plurality of convex ribs, and this structure can effectively solve the problem that the track 162 cannot be assembled in place due to the different thickness of its own material.

[0121] More preferably, when the slide rod 1613 is threadedly connected to the base 11 , the threaded connection between the slide rod 1613 and the base 11 is filled with adhesive; and / or, when the slide rod 1613 is threadedly connected to the base 11 , the slide rod 1613 is in surface contact with the track 162 .

[0122] The adhesive is used to further increase the connection strength between the slide bar 1613 and the base 11 to prevent the slide bar 1613 from loosening after rotating relative to the base 11. The slide bar 1613 is in surface contact with the track 162, which effectively prevents the slide bar 1613 from rotating relative to the base 11.

[0123] like Fig. 9 As shown, a mounting opening 120 is provided on the base 12, and an extension ring 121 is provided on the base 12 around the mounting opening 120, the hardness of the track 162 is less than the hardness of the extension ring 121, and the track 162 is inserted into the extension ring 121 through the mounting opening 120. When the track 162 is inserted into the extension ring 121, the track 162 does not penetrate the extension ring 121.

[0124] Since the track 162 does not pass through the extension ring 121, the extension ring 121 located in the track 162 will not collide with the base 11; that is, during the forward and backward movement of the base 11, this structure effectively reduces the probability of the base 11 colliding with the track 162, thereby reducing the probability of the track 162 being displaced relative to the base 12.

[0125] like Fig. 9 As shown, the guide member 161 includes a slide bar 1613 and an annular gasket 1614. The hardness of the annular gasket 1614 is less than the hardness of the extension ring 121. The slide bar 1613 sequentially passes through the track 162 and the annular gasket 1614 and is fixedly connected to the base 11.

[0126] When the sliding rod 1613 passes through the track 162 and the annular gasket 1614 in sequence and is fixedly connected to the base 11 , the annular gasket 1614 can abut against the extension ring 121 .

[0127] The annular gasket 1614 is used to protect the base 11 and prevent the base 11 from being scratched by the extension ring 121 .

[0128] Preferably, the slide rod 1613 is threadedly connected to the base 11; and / or, a plurality of outwardly protruding ribs are provided on the outer peripheral side of the track 162, and the track 162 is inserted into the base 12. When the track 162 is inserted into the base 12, the track 162 abuts against the base 12 through the ribs.

[0129] like Figure 1 and Figure 5 As shown, the driving device 15 is movably disposed on the base 11 ; of course, the driving device 15 of the utility model can also be movably disposed on the base 12 .

[0130] like Figure 1 and Figure 5 As shown, the driving device 15 includes:

[0131] A driver 151, the driver 151 is movably disposed on the base 11 or the base 12;

[0132] A driving rod 152, the driving rod 152 is movably disposed on the driver 151;

[0133] The connecting structure 153 is fixedly connected to the leg assembly 14, and the connecting structure 153 is rotatably connected to the base 11. The connecting structure 153 includes a swing plate 1531 rotatably connected to the driving rod 152. During the transformation of the mechanical extension structure 1 between the sitting position and the lying position, the driving rod 152 drives the connecting structure 153 to rotate relative to the base 11 via the swing plate 1531.

[0134] In the prior art, the mechanical extension structure is provided with two groups of leg assemblies, and the two groups of leg assemblies are connected by a connecting structure. The connecting structure is rotatably connected to the driving rod on the driver, but the existing connecting structure is not rotatably connected to the base. That is to say: in the process of the leg assembly extending in front of the base (or the leg assembly being retracted under the base), the connecting structure is suspended in the air throughout the process; at this time, the force required for the leg assembly to move relative to the base is directly provided by the connecting structure.

[0135] The connecting structure 153 is fixed to the leg assembly 14. When the mechanical extension structure 1 changes between a sitting position and a lying position, the driving 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 to be retracted under the base 11.

[0136] In the present invention, since the connection mechanism 153 is rotatably connected to the base 11, the base 11 provides support force for the connection mechanism 153 throughout the process of the leg assembly 14 extending in front of the base 11 (or the leg assembly 14 being folded under the base 11); this means that the base 11 can weaken at least part of the torque required by the connection mechanism 153 to drive the leg assembly 14 during the process of the leg assembly 14 extending in front of the base 11 (or the leg assembly 14 being folded under the base 11). The structure of "the connection mechanism 153 is rotatably connected to the base 11" provides an eccentric basis for "the driving rod is arranged at an eccentric position of the connection structure".

[0137] Preferably, the connecting structure 153 includes at least one connecting rod rotatably connected to the base 11, such as Figure 1 and Figure 6 As shown, the swing plate 1531 is fixedly connected to the connecting rod;

[0138] like Fig.10 As shown, at least one support block 114 is provided on the base 11, at least one connecting rod is located below one support block 114, and 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.

[0139] 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 to improve the anti-deformation ability of the base 11; if the connecting rod is located below the support block 114, the connecting rod can absorb the impact force from the top of the base 11; if the connecting rod is located on the side wall of the base 11, the connecting rod 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.

[0140] In the present invention, the connection structure 153 may include a connecting rod, and the two sets of leg assemblies 14 are connected by the connecting rod. Figure 1 and Figure 7 As shown; in the utility model, the connecting structure 153 may also include two connecting rods, each connecting rod is connected to a group of leg components 14, and each connecting rod is fixedly connected to the swing plate 1531.

[0141] In the present 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 spacing distance between the support block 114 and the connecting rod is less than the width dimension of the connecting rod. Since the connecting rod of the present invention is circular, the width dimension of the connecting rod is the diameter of the connecting rod.

[0142] Preferably, the base 11 is made of metal, the support block 114 is made of plastic, and the connecting rod is made of metal.

[0143] When the hardness of the support block 114 is less than the hardness of the base 11, and 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 the external object through its own deformation, thereby further reducing the deformation amplitude of the base 11 after being impacted by the external force. When the hardness of the support block 114 is less than the hardness of the base 11, and the hardness of the support block 114 is less than the hardness of the connecting rod, after being impacted by the external force, 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.

[0144] like Fig.10 As shown, the connecting rod is a circular connecting rod, and an arc groove corresponding to the connecting rod is provided on the support block 114, and at least part of the connecting rod is inserted into the arc groove. The arc groove is used to limit the position of the connecting rod on the support block 114 and 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 hit by an external force; that is, the reliability of the support block 114 is ensured.

[0145] Figure 6 In order to conveniently display the position of the guide 161 on the track 162 when the mechanical extension structure 1 is in the sitting position, and the position of the guide 161 on the track 162 when the mechanical extension structure 1 is in the lying position, two guides 161 are arranged on one track 162, wherein the position of the guide 161 on the left side of the track 162 when the mechanical extension structure 1 is in the lying position, and the position of the guide 161 on the right side of the track 162 when the mechanical extension structure 1 is in the sitting position.

[0146] like Figure 6 As shown, when the mechanical extension structure 1 is in the sitting position, the guide member 161 is located at the position P1 on the right side of the track 162; when the mechanical extension structure 1 is in the lying position, the guide member 161 is located at the position P2 on the left side of the track 162;

[0147] The rotation connection between the swing plate 1531 and the driving rod 152 is the first transfer point 30. When the mechanical extension structure 1 is in the sitting position, the first transfer point 30 is located at P3. Figure 1 , Figure 3 , Figure 5 and Figure 6 When the mechanical extension structure 1 is in a lying position, the first transfer point 30 is located at P4, as Figure 4 and Figure 7 As shown; the straight-line distance between P1 and P2 is less than the straight-line distance between P3 and P4.

[0148] It is not difficult to conclude that “the straight-line distance between P1 and P2 is less than the straight-line distance between P3 and P4”: the length of the track 162 and the length of the swing plate 1531 determine the extended length of the leg assembly 14 .

[0149] like Figure 5 As shown, the base 11 has two tracks 162 on one side, and the two tracks 162 are respectively a first track 1601 and a second track 1602 . The first track 1601 and the second track 1602 are respectively arranged on both sides of the base 11 .

[0150] Preferably, the track 162 includes an inclined section 168 and a straight section 169, and the inclined section 168 and the straight section 169 have an arc transition. When the mechanical extension structure 1 is in a sitting position, the angle between the inclined section 168 and the upper end surface 113 of the base 11 is 5°<45°; when the mechanical extension structure 1 is in a lying position, the angle between the upper end surface 113 of the base 11 and the horizontal plane is 3°≤10°.

[0151] The horizontal plane is Figure 3 The front and rear directions, and the horizontal plane are Figure 6 inclined section 168 with its center line and one of the upper end surfaces as a measurement reference, in order to achieve the measurement of the angle between the inclined section 168 and the upper end surface 113 of the base 11.

[0152] After a lot of market research, it is found that when 3°≤the angle between the upper end surface 113 of the base 11 and the horizontal plane is <10°, the angle at which the user lies on the seat unit is most comfortable. Since the movement distance of the guide 161 is controlled by the swing plate 1531, in order to enable the base 11 to move to the most comfortable angle of the seat unit within the limited travel of the track 162, the track 162 of the utility model includes an inclined section 168, and the inclined section 168 is set to a specific inclined angle (specific inclined angle: 5°<the angle between the inclined section 168 and the upper end surface 113 of the base 11<45°), so as to enable the base 11 to move to the most comfortable angle of the seat unit within the limited travel of the track 162.

[0153] Preferably, 7 cm < swing plate 1531 < 30 cm, and during the transformation of the mechanical extension structure 1 between the sitting position and the lying position, the swing plate 1531 is located above the lower end surface 122 of the base 12. This structure reduces the probability of the swing plate 1531 colliding with external objects during transportation, especially when the seat unit removes the support rod 18, wherein the support rod 18 is arranged below the base 12 for supporting the seat unit, and the height dimension of the support rod 18 is L2, and L2 is greater than or equal to 8 cm.

[0154] like Figure 5 As shown, the mechanical extension structure 1 further includes a swing mechanism 17, and the leg assembly 14, the base 11 and the base 12 are respectively movably connected to the swing mechanism 17. When the leg assembly 14, the base 11 and the base 12 are respectively movably connected to the swing mechanism 17, the leg assembly 14 can drive the base 11 to move relative to the base 12 through the swing mechanism 17.

[0155] Preferably, during the transformation of the mechanical extension structure 1 between the sitting position and the lying position, at least part of the swing mechanism 17 can move to the bottom of the base 12. This structure increases the length of the swing mechanism 17 to increase the range of motion of the base 11 relative to the base 12 within a limited space (especially within a limited front-to-back length distance) of the seat unit.

[0156] like Figure 5 and Figure 7 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.

[0157] Of course, in the present invention, in order to avoid the three-link structure of the swing mechanism 17, the swing mechanism 17 can also be four or more links, for example: the first link is replaced by at least two links, the second link is replaced by at least two links, and the third link is replaced by at least two links. The swing mechanism and the base, the base, and the leg assembly can also be slightly slidably matched and rotated in the limit groove.

[0158] Preferably, the distance between the rotational connection between the second link 172 and the base 11 and the rotational connection between the first link 171 and the second link 172 is greater than the distance between the rotational connection between the second link 172 and the base 11 and the rotational connection between the third link 173 and the second link 172 . “The distance between the second link 172 and the base 11 rotation connection and the first link 171 and the second link 172 rotation connection> the distance between the second link 172 and the base 11 rotation connection and the third link 173 and the second link 172 rotation connection” is used to adjust the extension difficulty of the leg assembly 14. When the distance between the second link 172 and the base 11 rotation connection and the first link 171 and the second link 172 rotation connection> the distance between the second link 172 and the base 11 rotation connection and the third link 173 and the second link 172 rotation connection, the movement speed of the leg assembly 14 will be slowed down during the transformation of the mechanical extension structure 1 from the sitting position to the lying position by using the lever principle. This structure facilitates the user to adjust the seat unit to a suitable angle.

[0159] The sofa includes the seat unit described in the present embodiment, and the leg assembly 14 includes a main leg rest mounting plate 145, a front leg rest rotating plate 144, a rear leg rest rotating plate 143, a front leg rest connecting plate 141 and a rear leg rest connecting plate 142, one end of the front leg rest rotating plate 144 and one end of the rear leg rest rotating plate 143 are respectively rotatably connected to the main leg rest mounting plate 145, the other end of the front leg rest rotating plate 144 is rotatably connected to one end of the front foot rest connecting plate 141, the other end of the rear leg rest rotating plate 143 is rotatably connected to one end of the rear leg rest connecting plate 142, the front foot rest connecting plate 141 is rotatably connected to the rear leg rest rotating plate 143, and the other end of the front leg rest connecting plate 141 and the other end of the rear leg rest connecting plate 142 are respectively rotatably connected to the base 11.

[0160] Preferably, the leg assembly 14 also includes an auxiliary leg rest mounting plate 147 and a front leg rest extension plate 146 . The auxiliary leg rest mounting plate 147 is movably connected to the main leg rest mounting plate 145 via the front leg rest extension plate 146 . The auxiliary leg rest mounting plate 147 is also rotatably connected to the front leg rest rotating plate 144 .

[0161] like Figure 1 , Figure 3 and Figure 5 As shown, the backrest assembly 13 includes a backrest plate 131, a backrest front bracket 132, a backrest rear bracket 133 and a linkage bracket 134. The backrest plate 131 is arranged on the backrest structure 100, one end of the backrest front bracket 132 and one end of the backrest rear bracket 133 are respectively rotatably connected to the backrest plate 131, and the other end of the backrest front bracket 132 and the other end of the backrest rear bracket 133 are respectively rotatably connected to the base 12;

[0162] 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 backrest front bracket 132. Figure 1 or, the other end of the linkage bracket 134 is rotatably connected to the backrest bracket 133, such as Figure 5 shown.

[0163] like Figure 5 As shown, the backrest bracket 133 includes a widened portion 1331, the length of the widened portion 1331 is ≥5 cm, and the other end of the linkage bracket 134 is rotatably connected to the backrest bracket 133; wherein, the length of the widened portion 1331 refers to the length of the widened portion 1331 at its widest point.

[0164] The widened portion 1331 is used to increase the installation space of the linkage bracket 134 on the backrest rear bracket 133 to avoid that the anti-deformation strength of the backrest rear bracket 133 is seriously weakened after the linkage bracket 134 is rotatably connected with the backrest rear bracket 133 .

[0165] When the other end of the linkage bracket 134 is rotatably connected to the backrest bracket 133, the rotational connection point between the other end of the linkage bracket 134 and the backrest bracket 133 is the second transfer point 20, and the rotational connection point between one end of the backrest bracket 133 and the backrest board 131 is the third transfer point 10;

[0166] When the mechanical extension structure 1 is in the sitting position, the second transfer point 20 is located below the third transfer point 10. Figure 5 When the mechanical extension structure 1 is in a lying position, the second transfer point 20 is located above the third transfer point 10, as shown Figure 7 When the mechanical extension structure 1 is in the lying position, the second transfer point 20 is raised to increase the height of the linkage bracket 134 relative to the backrest bracket 133; this structure effectively improves the stability of the backrest assembly 13 when the mechanical extension structure 1 is in the lying position.

[0167] Preferably, one end of the linkage bracket 134 is rotatably connected to the side wall of the base 11. This structure increases the anti-deformation strength of the base 11.

[0168] like Figure 1 As shown, when the other end of the linkage bracket 134 is rotatably connected to the backrest front bracket 132, the rotation connection point between the other end of the linkage bracket 134 and the backrest front bracket 132 is the fourth transfer point, and the rotation connection point between one end of the backrest front bracket 132 and the backrest plate 131 is the fifth transfer point;

[0169] When the mechanical extension structure 1 is in the sitting position, the fourth transfer point is below the fifth transfer point; when the mechanical extension structure 1 is in the lying position, the fourth transfer point is above the fifth transfer point. When the mechanical extension structure 1 is in the lying position, the height of the fourth transfer point is raised to increase the linkage bracket 134 relative to the backrest front bracket 132; this structure effectively improves the stability of the backrest assembly 13 when the mechanical extension structure 1 is in the lying position.

[0170] Preferably, one end of the linkage bracket 134 is rotatably connected to the side wall of the base 11. This structure further increases the anti-deformation capability of the base 11 and prevents the linkage bracket 134 from extending below the base 11.

[0171] Preferably, when the mechanical extension structure 1 is in a sitting position, the backrest front bracket 132 and the cushion structure 200 are in a clearance fit; and / or, when the mechanical extension structure 1 is in a lying position, the backrest front bracket 132 and the cushion structure 200 are in a clearance fit. This structure prevents the backrest front bracket 132 from scratching the cushion decoration cover (the cushion decoration cover includes cowhide and technological cloth) on the cushion structure 200; when one end of the linkage bracket 134 is rotatably connected to the side wall of the base 11, and the backrest front bracket 132 and the cushion structure 200 are in a clearance fit, since the linkage bracket 134 blocks the backrest front bracket 132, as shown in FIG. Figure 4 and Figure 7 As shown, therefore, as long as the user does not intentionally put his hand deep into between the linkage bracket 134 and the backrest front bracket 132 , the user's hand will not be clamped between the backrest front bracket 132 and the base 11 .

[0172] like Figure 5 As shown, the thickness of the backrest board 131 is less than 3 mm, and a plurality of protrusions 1311 extending outward are provided on the backrest board 131 , and the thickness of the protrusions 1311 is greater than 3 mm. This structure ensures the anti-deformation strength of the backrest board 131 while reducing the manufacturing cost of the backrest board 131 .

[0173] In the utility model, the backrest assembly 13 can also include a third structure: the backrest assembly includes a backrest plate, a front backrest bracket, a backrest rear bracket and a linkage bracket, the backrest plate is arranged on the backrest structure, one end of the front backrest bracket and one end of the backrest rear bracket are respectively rotatably connected to the backrest plate, the other end of the backrest rear bracket is rotatably connected to the base, the front backrest bracket is also rotatably connected to the base, one end of the linkage bracket is rotatably connected to the other end of the front backrest bracket, and the other end of the linkage bracket is rotatably connected to the backrest rear bracket.

[0174] like Figure 1 and Figure 5 As shown, the driving device 15 is arranged at an eccentric position of the base 11 .

[0175] In the prior art, the driving rod of the seat unit is located in the middle of the base; a serpentine spring is provided on the base, and the serpentine spring is used to support the cushion structure. At least part of the cushion structure is provided above the serpentine spring. After the user sits on the cushion structure, the cushion structure transmits the user's gravity to the serpentine spring to cause the serpentine spring to undergo elastic deformation. However, the user discovered that when the driving rod of the seat unit is located in the middle of the base, the elastically deformed serpentine spring may abut against the driving rod. Therefore, the utility model sets the driving device 15 at an eccentric position of the base 11 to further reduce the probability of the serpentine spring contacting the driving rod 152.

[0176] Preferably, the track 162 is snap-connected to the base 12; and / or, the track 162 is connected to the base 12 via a fastener, which may be a screw, a bolt, or a pin. This structure facilitates assembly and disassembly of the track.

[0177] Preferably, a cushion pad (not marked) is provided on the track 162, the hardness of the cushion pad is less than the hardness of the first limiting structure 1621, and when the mechanical extension structure 1 is in the sitting position, the guide member 161 does not abut against the cushion pad; when the mechanical extension structure 1 is in the lying position, the cushion pad is sandwiched between the guide member 161 and the first limiting structure 1621;

[0178] When the mechanical extension structure 1 is transformed from the lying position to the sitting position, the seat cushion structure 200 abuts against the backrest structure 100 , and the seat cushion structure 200 and / or the backrest structure 100 undergo elastic deformation.

[0179] Since the seat cushion structure 200 squeezes the backrest structure 100 during the process of the mechanical extension structure 1 changing from a lying position to a sitting position; therefore, when the mechanical extension structure 1 is in the sitting position, the first limiting structure 1621 does not need to remove the force of the guide member 161, and the backrest structure 100 has already removed the force of the guide member 161; that is, when the mechanical extension structure 1 is in the sitting position, the guide member 161 does not need to counteract the buffer pad; wherein, the force of the guide member 161 is generated during the sliding of the guide member 161 along the track 162.

[0180] In the utility model, the backrest structure 100 includes a backrest frame, a backrest elastic member, a backrest filler and a backrest decorative cover. The backrest board is inserted into the backrest frame, the backrest filler is arranged in the backrest decorative cover, the backrest decorative cover is arranged in the backrest frame, and the backrest elastic member is arranged in the backrest frame to provide elastic support force for the backrest decorative cover.

[0181] 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 with the backrest frame.

[0182] In the utility model, the backrest decorative cover is fixedly connected to the decorative groove by Velcro, and the backrest decorative cover is detachably arranged on the backrest frame; and / or the decorative groove includes an inclined groove wall, and the cross-sectional area of ​​the decorative groove opening is less than the cross-sectional area of ​​the decorative groove bottom.

[0183] In the prior art, the backrest decorative cover can also fix the backrest filler inside by means of stitching or buckling, but this structure can also adopt the Velcro of the utility model.

[0184] Preferably, a first sealing structure is provided on the backrest decorative cover, and a first zipper is provided on the first sealing structure, and the first zipper is used to open or close the first sealing structure, and after the first zipper opens the first sealing structure, the backrest filler can enter the backrest decorative cover from the first sealing structure. This structure cooperates with Velcro to realize that the backrest filler can be removed from the backrest decorative cover without the aid of any tools.

[0185] In the present invention, there are two kinds of seat cushion structures 200: 1. The seat cushion structure includes a seat cushion elastic part, a seat cushion filler and a seat cushion decorative cover, the seat cushion filler is arranged in the seat cushion decorative cover, the seat cushion decorative cover is arranged on the base, and the seat cushion elastic part is arranged on the base to provide elastic support force for the seat cushion decorative cover. 2. The seat cushion structure includes a seat cushion frame, a seat cushion elastic part, a seat cushion filler and a seat cushion decorative cover, the seat cushion filler is arranged in the seat cushion decorative cover, the seat cushion decorative cover is arranged on the seat cushion frame, the seat cushion frame is arranged on the base, and the seat cushion elastic part is arranged on the seat cushion frame to provide elastic support force for the seat cushion decorative cover.

[0186] Preferably, the seat cushion decorative cover is provided with a second sealing structure, and the second sealing structure is provided with a second zipper, the second zipper is used to open or close the second sealing structure, and after the second zipper opens the second sealing structure, the seat cushion filling can enter the seat cushion decorative cover from the second sealing structure.

[0187] Preferably, when the seat cushion decoration cover is arranged on the base, the seat cushion decoration cover is hung on the base; when the seat cushion decoration cover is arranged on the seat cushion frame, the seat cushion decoration cover is hung on the seat cushion frame.

[0188] In this embodiment, the upper, lower, front and rear positions of the seat unit are Figure 3 and Figure 6 The direction indicated by the arrow is the standard.

[0189] The above is only an explanation of the best embodiment of the utility model, which cannot be understood as a limitation of the claims. The utility model is not limited to the above embodiments, and all changes made within the protection scope of the independent claims of the utility model are within the protection scope of the utility model.

Claims

1. A seat unit, comprising a backrest structure, a seat cushion structure and a mechanical extension structure, wherein the mechanical extension structure comprises a base, a base, two sets of backrest components, two sets of leg components and a driving device, wherein the seat cushion structure is fixedly connected to the base, the backrest structure is movably arranged at the rear of the base through the backrest component, the leg component is movably arranged at the front of the base, and the driving device is arranged at the leg component; The mechanical extension structure has a sitting position and a lying position. When the mechanical extension structure is changed from the sitting position to the lying position, the driving device drives the base to move forward through the leg assembly, so that the leg assembly is extended in front of the base and the backrest assembly is tilted back relative to the base; when the mechanical extension structure is changed from the lying position to the sitting position, the driving device drives the base to move backward through the leg assembly, so that the leg assembly is folded under the base and the backrest assembly is returned to the normal position relative to the base. It is characterized in that The mechanical extension structure also includes a guide and a track, one of which is fixedly connected to the base, and the other is fixedly connected to the base, and the guide is inserted into the track; the base and / or the track is provided with a first limiting structure for preventing the guide from sliding out of the track and separating from the track, and the guide slides along the track during the transformation of the mechanical extension structure between a sitting position and a lying position.

2. The seat unit according to claim 1, characterized in that The guide member includes a fixed rod and a sliding rod. The fixed rod is fixedly connected to the base, the track is fixedly connected to the base, the fixed rod and the track are respectively slidably connected to the sliding rod. During the transformation of the mechanical extension structure between a sitting position and a lying position, the fixed rod slides along the track through the sliding rod. The sliding rod is provided with a limiting portion that can be used to abut against the first limiting structure, and the hardness of the limiting portion is different from that of the first limiting structure.

3. The seat unit according to claim 2, characterized in that The fixing rod is provided with a second limiting structure which prevents the sliding rod from sliding out of the fixing rod and separating from the fixing rod.

4. The seat unit according to claim 3, characterized in that The hardness of the second limiting structure is different from that of the limiting portion. When the fixed rod and the track are slidably connected to the sliding rod respectively, the limiting portion can be clamped between the first limiting structure and the second limiting structure.

5. The seating unit according to claim 1, wherein: The track is fixedly connected to the base, and a slide groove is provided on the track. The guide member can be inserted into the slide groove. The slide groove includes a first guide surface and a second guide surface corresponding to the first guide surface. During the transformation of the mechanical extension structure between a sitting position and a lying position, the guide member can slide along the first guide surface or the second guide surface to make the base slide along the base.

6. The seating unit according to claim 5, characterized in that The base is provided with a mounting opening, and an extension ring is provided on the base around the mounting opening. The hardness of the track is less than the hardness of the extension ring. The track is inserted into the extension ring through the mounting opening. When the track is inserted into the extension ring, the track passes through the extension ring.

7. The seating unit according to claim 6, characterized in that The guide member includes a slide bar and an annular gasket, the hardness of the annular gasket is less than the hardness of the extension ring, and the slide bar passes through the track and the annular gasket in sequence and is fixedly connected to the base; When the slide bar passes through the track and the annular gasket in sequence and is fixedly connected to the base, the annular gasket can abut against the track.

8. The seating unit according to claim 7, wherein: The slide rod is threadedly connected to the base; and / or, a plurality of convex ribs protruding outward are provided on the outer peripheral side of the track, and the track is inserted into the base. When the track is inserted into the base, the track abuts against the base through the convex ribs.

9. The seating unit according to claim 8, characterized in that When the slide rod is threadedly connected to the base, the threaded connection between the slide rod and the base is filled with adhesive; and / or, when the slide rod is threadedly connected to the base, the slide rod contacts the track surface.

10. The seating unit of claim 5, wherein: The base is provided with a mounting opening, and an extension ring is provided on the base around the mounting opening. The hardness of the track is less than the hardness of the extension ring. The track is inserted into the extension ring through the mounting opening. When the track is inserted into the extension ring, the track does not penetrate the extension ring.

11. The seating unit according to claim 10, wherein: The guide member includes a slide bar and an annular gasket, the hardness of the annular gasket is less than the hardness of the extension ring, and the slide bar passes through the track and the annular gasket in sequence and is fixedly connected to the base; When the slide bar passes through the track and the annular gasket in sequence and is fixedly connected to the base, the annular gasket can abut against the extension ring.

12. The seat unit according to any one of claims 1 to 11, characterized in that: The driving device is movably arranged on the base or the pedestal.

13. The seating unit of claim 12, wherein: The drive unit includes: A driver, the driver being movably disposed on a base or a chassis; A driving rod, the driving rod is movably arranged on the driver; A connecting structure, the connecting structure is fixedly connected to the leg assembly, the connecting structure is rotatably connected to the base, and the connecting structure includes a swing plate rotatably connected to the driving rod; during the transformation of the mechanical extension structure between a sitting position and a lying position, the driving rod drives the connecting structure to rotate relative to the base through the swing plate.

14. The seating unit of claim 13, wherein: 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; At least one supporting block is disposed on the base, at least one connecting rod is located below one supporting block, and the base can abut against the connecting rod through the supporting block; and / or at least part of the supporting block is located between the side wall of the base and the side wall of the connecting rod.

15. The seating unit of claim 14, wherein: 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.

16. The seating unit of claim 14, wherein: The connecting rod is a circular connecting rod, and the supporting block is provided with an arc-shaped groove corresponding to the connecting rod, and at least a part of the connecting rod is inserted into the arc-shaped groove.

17. The seating unit of claim 13, wherein: When the mechanical extension structure is in the sitting position, the guide is located at P1; when the mechanical extension structure is in the lying position, the guide is located at P2; The rotational connection between the swing plate and the driving rod is the first transfer point, and when the mechanical extension structure is in the sitting position, the first transfer point is located at P3; When the mechanical extension structure is in the lying position, the first transfer point is located at P4; the straight-line distance between P1 and P2 is less than the straight-line distance between P3 and P4.

18. The seating unit of claim 17, wherein: The track includes an inclined section and a straight section, and the inclined section and the straight section have an arc transition. When the mechanical extension structure is in a sitting position, the angle between the inclined section and the upper end surface of the base is 5°<45°; when the mechanical extension structure is in a lying position, the angle between the upper end surface of the base and the horizontal plane is 3°≤10°.

19. The seating unit of claim 18, wherein: 7cm<swing plate<30cm, when the mechanical extension structure is transformed between the sitting position and the lying position, the swing plate is located above the lower end surface of the base.

20. The seating unit according to any one of claims 1 to 11, characterized in that The mechanical extension structure also includes a swing mechanism, and the leg assembly, the base and the base are movably connected to the swing mechanism respectively.

21. The seating unit of claim 20, wherein: During the transformation of the mechanical extension structure between the sitting position and the lying position, at least part of the swing mechanism can be moved below the base.

22. The seating unit of claim 20, wherein: The swing mechanism includes a first connecting rod, a second connecting rod and a third connecting rod. One end of the first connecting rod is rotatably connected to the base, one end of the third connecting rod is rotatably connected to the leg assembly, the second connecting rod is rotatably connected to the base, the other end of the first connecting rod is rotatably connected to one end of the second connecting rod, and the other end of the third connecting rod is rotatably connected to the other end of the second connecting rod.

23. The seating unit of claim 22, wherein: The distance between the rotational connection point between the second connecting rod and the base and the rotational connection point between the first connecting rod and the second connecting rod is greater than the distance between the rotational connection point between the second connecting rod and the base and the rotational connection point between the third connecting rod and the second connecting rod.

24. A sofa, characterized in that A seat unit comprising any one of claims 1-23, wherein the leg assembly comprises a main legrest mounting plate, a front legrest rotating plate, a rear legrest rotating plate, a front legrest connecting plate and a rear legrest connecting plate, one end of the front legrest rotating plate and one end of the rear legrest rotating plate are respectively rotatably connected to the main legrest mounting plate, the other end of the front legrest rotating plate is rotatably connected to one end of the front footrest connecting plate, the other end of the rear legrest rotating plate is rotatably connected to one end of the rear legrest connecting plate, the front footrest connecting plate is rotatably connected to the rear legrest rotating plate, and the other end of the front legrest connecting plate and the other end of the rear legrest connecting plate are respectively rotatably connected to the base.

25. The sofa according to claim 24, characterized in that: The backrest assembly includes a backrest plate, a backrest front bracket, a backrest rear bracket and a linkage bracket. The backrest plate is arranged on the backrest structure. One end of the backrest front bracket and one end of the backrest rear bracket are respectively rotatably connected to the backrest plate, and the other end of the backrest front bracket and the other end of the backrest rear bracket are respectively rotatably connected to the base. One end of the linkage bracket is rotatably connected to the base, and the other end of the linkage bracket is rotatably connected to the front bracket of the backrest or the rear bracket of the backrest.

26. The sofa according to claim 25, characterized in that: The backrest bracket includes a widened portion, the length of the widened portion is ≥5cm, and the other end of the linkage bracket is rotatably connected to the backrest bracket.

27. The sofa according to claim 26, characterized in that: When the other end of the linkage bracket is rotatably connected to the backrest bracket, the rotation connection point between the other end of the linkage bracket and the backrest bracket is the second transfer point, and the rotation connection point between one end of the backrest bracket and the backrest board is the third transfer point; When the mechanical extension structure is in the sitting position, the second transfer point is located below the third transfer point; When the mechanical extension structure is in the lying position, the second transition point is located above the third transition point.

28. The sofa according to claim 27, characterized in that: One end of the linkage bracket is rotatably connected to the side wall of the base.

29. The sofa according to claim 25, characterized in that: When the other end of the linkage bracket is rotationally connected to the front backrest bracket, the rotation connection point between the other end of the linkage bracket and the front backrest bracket is the fourth transfer point, and the rotation connection point between one end of the front backrest bracket and the backrest board is the fifth transfer point; When the mechanical extension structure is in the sitting position, the fourth transfer point is located below the fifth transfer point; When the mechanical extension structure is in the lying position, the fourth transition point is located above the fifth transition point.

30. The sofa according to claim 24, characterized in that: When the mechanical extension structure is in the sitting position, the front bracket of the backrest and the seat cushion structure are loosely matched; and / or, when the mechanical extension structure is in the lying position, the front bracket of the backrest and the seat cushion structure are loosely matched.

31. The sofa according to claim 25, characterized in that: The thickness of the backrest board is less than 3mm, and a plurality of protrusions extending outward are arranged on the backrest board, and the thickness of the protrusions is greater than 3mm.

32. The sofa according to claim 24, characterized in that: The backrest assembly includes a backrest plate, a front backrest bracket, a backrest rear bracket and a linkage bracket. The backrest plate is arranged on the backrest structure. One end of the front backrest bracket and one end of the backrest bracket are respectively rotatably connected to the backrest plate, and the other end of the backrest bracket is rotatably connected to the base. The front backrest bracket is also rotatably connected to the base. One end of the linkage bracket is rotatably connected to the other end of the front backrest bracket, and the other end of the linkage bracket is rotatably connected to the backrest bracket.

33. The sofa according to claim 24, characterized in that: The driving rod is arranged at an eccentric position of the connecting structure.

34. The sofa according to claim 24, characterized in that: The track is connected to the base by snap-fit; and / or, the track is connected to the base by fasteners.

35. The sofa according to claim 24, characterized in that: A buffer pad is provided on the track, the hardness of the buffer pad is less than the hardness of the first limiting structure, when the mechanical extension structure is in the sitting position, the guide member does not abut against the buffer pad; when the mechanical extension structure is in the lying position, the buffer pad is sandwiched between the guide member and the first limiting structure; During the transformation of the mechanical extension structure from the lying position to the sitting position, the seat cushion structure abuts against the backrest structure, and the seat cushion structure and / or the backrest structure undergo elastic deformation.

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