Seat unit and sofa

Abstract

The utility model relates to a seat unit and a sofa, and solves the problem that fingers of a user are easily pinched by the seat unit. The seat unit comprises a backrest structure, the backrest assembly comprises a backrest plate, a backrest front support and a backrest rear support, the backrest plate is detachably inserted into the mounting part, the upper end of the backrest front support is rotationally connected with the backrest plate, the lower end of the backrest front support is rotationally connected with the base, the upper end of the backrest rear support is rotationally connected with the backrest plate, and the backrest rear support is rotationally connected with the base; wherein the backrest front support and the backrest rear support are located in the projection of the backrest structure on the horizontal plane, when the backrest plate is inserted into the installation part, the backrest front support and the backrest decoration cover abut against the seat cushion decoration cover, and the length distance between the front face of the backrest decoration cover and the front face of the backrest frame is larger than the height size, located above the base, of the backrest front support. The length distance between the upper end face of the seat cushion decoration cover and the upper end face of the seat cushion frame is larger than the height of the backrest front support located above the base.

Description

Technical Field

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

[0002] In the prior art, a variety of seat units are disclosed, which include a backrest structure, a cushion structure and a mechanical extension structure, wherein the user's buttocks can sit on the cushion structure and the user's back can lean against the front of the backrest structure, wherein the mechanical extension structure has a sitting position and a lying position.

[0003] The mechanical extension structure includes a backrest assembly, which is installed on the backrest assembly. When the mechanical extension structure is transformed from a sitting position to a lying position, the backrest assembly will drive the backrest structure to lean back relative to the seat cushion structure; when the mechanical extension structure is transformed from a lying position to a sitting position, the backrest assembly will drive the backrest structure to return to the original position relative to the seat cushion structure.

[0004] However, during the movement of the backrest structure relative to the seat cushion structure, the backrest assembly will also move relative to the backrest structure, which may cause the user's fingers to be pinched during the movement of the backrest assembly. 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 that the seat unit easily pinches the fingers of users.

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

[0007] The seat unit includes a backrest structure, a seat cushion structure and a mechanical extension structure, wherein the mechanical extension structure includes a base for mounting the seat cushion structure and a backrest assembly for mounting the backrest structure;

[0008] The backrest structure includes a backrest frame, a backrest filler, a backrest decorative cover and a backrest elastic member. The backrest frame is provided with a mounting member, the backrest elastic member is arranged on the backrest frame, the backrest filler is arranged on the backrest decorative cover, and the backrest decorative cover is arranged on the backrest frame. When the backrest device cover is arranged on the backrest frame, the backrest elastic member abuts against the backrest decorative cover and provides elastic support force for the backrest device cover.

[0009] The seat cushion structure includes a seat cushion frame, a seat cushion filler, a seat cushion decorative cover and a seat cushion elastic member, wherein the seat cushion elastic member is arranged on the seat cushion frame, the seat cushion filler is arranged on the seat cushion decorative cover, and the seat cushion decorative cover is arranged on the seat cushion frame. When the seat cushion decorative cover is arranged on the seat cushion frame, the seat cushion elastic member is arranged on the seat cushion frame and provides elastic support force for the seat cushion decorative cover.

[0010] The backrest assembly includes a backrest plate, a front backrest bracket, and a backrest bracket. The backrest plate is detachably inserted into the mounting member. The upper end of the front backrest bracket is rotatably connected to the backrest plate, the lower end of the front backrest bracket is rotatably connected to the base, the upper end of the backrest bracket is rotatably connected to the backrest plate, and the backrest bracket is rotatably connected to the base.

[0011] Among them, the front bracket of the backrest and the rear bracket of the backrest are located within the projection of the backrest structure on the horizontal plane. When the backrest plate is inserted into the mounting part, the front bracket of the backrest and the backrest decorative cover respectively abut against the seat cushion decorative cover. The length distance between the front face of the backrest decorative cover and the front face of the backrest frame is greater than the height dimension of the front bracket of the backrest above the base. The length distance between the upper end face of the seat cushion decorative cover and the upper end face of the seat cushion frame is greater than the height dimension of the front bracket of the backrest above the base.

[0012] In the utility model, a backrest cavity is provided on the backrest frame, a mounting piece is provided on the wall of the backrest cavity, and the backrest board is detachably inserted into the mounting piece. When the backrest board is inserted into the mounting piece, since the mounting piece is located in the backrest cavity, at least part of the backrest board is located in the backrest cavity. This structure prevents the user's fingers from extending into the gap between the backrest board and the mounting piece, so as to achieve the purpose of anti-pinch of the seat unit.

[0013] When the front support and the rear support of the backrest are located within the projection of the backrest structure on the horizontal plane, the backrest assembly will not be exposed from the backrest structure. This structure reduces the probability of direct contact between the user's fingers and the backrest assembly to achieve the purpose of anti-pinching of the seat unit.

[0014] When the backrest plate is inserted into the mounting part and the backrest decorative cover abuts the seat cushion decorative cover, it is more difficult for the user's fingers to pass through the gap between the backrest decorative cover and the seat cushion decorative cover. When the backrest plate is inserted into the mounting part and the backrest front bracket abuts the seat cushion decorative cover, it is more difficult for the user's fingers to enter the gap between the backrest front bracket and the seat cushion decorative cover.

[0015] When the length distance between the front of the backrest decorative cover and the front of the backrest frame is greater than the height dimension of the backrest front bracket above the base, no matter how the backrest front bracket rotates relative to the base, the backrest front bracket will not move in front of the front of the backrest decorative cover; when the length distance between the upper end surface of the seat cushion decorative cover and the upper end surface of the seat cushion frame is greater than the height dimension of the backrest front bracket above the base, no matter how the backrest front bracket rotates relative to the base, the backrest front bracket will not move above the upper end surface of the seat cushion decorative cover. Since the backrest front bracket will not move in front of the front of the backrest decorative cover and will not move above the upper end surface of the seat cushion decorative cover, the backrest decorative cover and the seat cushion decorative cover have the function of preventing the user's fingers, back, and buttocks from contacting the backrest front bracket, so as to achieve the purpose of anti-pinch of the seat unit.

[0016] Preferably, the maximum deformation distance between the front of the backrest decorative cover and the front of the backrest frame is greater than the height of the backrest front bracket above the base, and the maximum deformation distance between the upper end surface of the seat cushion decorative cover and the upper end surface of the seat cushion frame is greater than the height of the backrest front bracket above the base.

[0017] In the utility model, the backrest filler and the seat cushion filler can be sponge, natural latex, down, artificial cotton, etc., that is, the backrest filler and the seat cushion filler can be deformed.

[0018] When the maximum deformation distance between the front of the backrest decorative cover and the front of the backrest frame is greater than the height dimension of the backrest front bracket above the base, the probability of the backrest front bracket piercing the backrest decorative cover during the rotation of the backrest front bracket relative to the base will be reduced; when the maximum deformation distance between the upper end surface of the seat cushion decorative cover and the upper end surface of the seat cushion frame is greater than the height dimension of the backrest front bracket above the base, the probability of the backrest front bracket piercing the seat cushion decorative cover during the rotation of the backrest front bracket relative to the base will be reduced. This structure makes the seat unit have an anti-pinch function, and the service life will also increase accordingly.

[0019] Preferably, after the backrest decorative cover is deformed, the length distance between the front face of the backrest decorative cover and the front face of the backrest frame is greater than the height dimension of the backrest front bracket above the base.

[0020] When the length distance between the front of the backrest decorative cover and the front of the backrest frame after deformation is greater than the height dimension of the backrest front bracket above the base, the back of the user will not touch the backrest front bracket even if the back of the user leans against the backrest decorative cover; when the length distance between the front of the backrest decorative cover and the front of the backrest frame after deformation is greater than the height dimension of the backrest front bracket above the base, the buttocks of the user will not touch the backrest front bracket even if the buttocks sit on the seat cushion decorative cover. Therefore, "the length distance between the front of the backrest decorative cover and the front of the backrest frame after deformation is greater than the height dimension of the backrest front bracket above the base" further enhances the anti-pinch effect of the seat unit.

[0021] Preferably, after the backrest decorative cover is deformed, the shortest distance between the front surface thereof and the backrest front bracket is ≥3 cm.

[0022] When the shortest distance between the front of the backrest decorative cover and the front bracket of the backrest after deformation is ≥3cm, the user will not feel the movement of the front bracket of the backrest even if the user's back is against the backrest decorative cover; when the shortest distance between the front of the backrest decorative cover and the front bracket of the backrest after deformation is ≥3cm, the user's buttocks will not feel the movement of the front bracket of the backrest even if the user's buttocks sit on the seat cushion decorative cover. Therefore, "the shortest distance between the front of the backrest decorative cover and the front bracket of the backrest after deformation is ≥3cm" further enhances the anti-pinch effect of the seat unit.

[0023] Preferably, the mechanical extension structure has a sitting position, a TV position and a lying position, and a limit rod is provided on the base. When the mechanical extension structure is in the sitting position, the back of the front bracket of the backrest abuts the limit rod. During the process of the mechanical extension structure changing from the TV position to the lying position, the backrest plate pushes the front bracket of the backrest to rotate clockwise, so that the front bracket of the backrest is separated from the limit rod and squeezes the seat cushion decorative cover.

[0024] When the mechanical extension structure is in the sitting position and the back of the front back bracket abuts the limit rod, the limit rod is used to prevent the front back bracket from rotating counterclockwise; since the limit rod prevents the front back bracket from rotating counterclockwise, the front back bracket cannot drive the backrest board to move away from the front back bracket. In other words, when the mechanical extension structure is in the sitting position, the front back bracket cannot drive the backrest board to move away from the front back bracket. This structure is preferably used to achieve zero wall-resting of the sofa unit.

[0025] When the mechanical extension structure changes from the TV posture position to the lying position, the backrest front bracket is separated from the limit rod, and the backrest front bracket presses the seat cushion decorative cover; because the seat cushion filler is arranged on the seat cushion decorative cover and the seat cushion filler can be deformed, the seat cushion filler deforms itself during the process of the backrest front bracket pressing the seat cushion decorative cover, so that the seat cushion decorative cover always abuts against the backrest front bracket. This structure effectively prevents the user's fingers or other parts of the body from accidentally extending into the gap between the backrest front bracket and the seat cushion decorative cover during the rotation of the backrest front bracket around the base, so as to achieve the purpose of anti-pinch of the seat unit.

[0026] Preferably, when the mechanical extension structure is in the lying position, the seat cushion decorative cover and the seat cushion filling are clamped between the backrest front bracket and the base.

[0027] When the seat cushion decoration cover and the seat cushion filler are sandwiched between the front bracket of the backrest and the base, it is difficult for the user's fingers to extend into the gap between the front bracket of the backrest and the base.

[0028] Preferably, the seat cushion decorative cover is detachably arranged on the seat cushion frame.

[0029] Since the seat cushion decorative cover and the seat cushion filler are clamped between the front bracket of the backrest and the base, when the seat cushion decorative cover is detachably arranged on the seat cushion frame, the user can remove the damaged seat cushion decorative cover (the seat cushion decorative cover is clamped by the front bracket of the backrest and the base) and replace the seat unit with a new seat cushion decorative cover.

[0030] Preferably, the limiting rod includes a base rod and a limiting sleeve arranged on the base rod, the base rod is fixedly connected to the base, and when the mechanical extension structure changes from a sitting position to a TV position, the back of the front bracket of the backrest abuts against the limiting sleeve; the hardness of the limiting sleeve is different from that of the front bracket of the backrest.

[0031] When the back side of the front bracket of the backrest abuts against the limiting sleeve and the hardness of the limiting sleeve is different from that of the front bracket of the backrest, there is no gap between the front bracket of the backrest and the limiting sleeve. This structure can prevent the user's fingers or other parts of the body from extending into the gap between the front bracket of the backrest and the limiting sleeve, so as to achieve the purpose of anti-pinch of the seat unit.

[0032] In addition, the limit sleeve can be replaced to increase the service life of the seat unit.

[0033] Preferably, a back limit groove matching the limit sleeve is provided on the back of the front back bracket, and when the back of the front back bracket abuts against the limit sleeve, the limit sleeve is inserted into the back limit groove and abuts against the groove wall of the back limit groove.

[0034] When the mechanical extension structure changes from a sitting position to a TV position, the backrest limit groove is used to prevent the limit sleeve from sliding relative to the front bracket of the backrest, so as to further improve the anti-pinch effect of the seat unit.

[0035] Preferably, the center point of the limit rod is A1, the center point of the rotation connection between the lower end of the backrest front bracket and the base is A2, the distance between A1 and A2 is greater than half the width of the backrest front bracket, and when the mechanical extension structure changes from the TV posture position to the lying position, the angle between the back of the backrest front bracket and the horizontal plane is less than 90°. This structure prevents the limit rod from interfering with the rotation of the backrest front bracket.

[0036] The center point of the rotational connection between the upper end of the front backrest bracket and the backrest plate is A3. When A2 and A3 are connected by a straight line, the width dimension between the straight line and the back of the front backrest bracket is one-half of the front backrest bracket.

[0037] Preferably, the backrest assembly further comprises a backrest drive rod, the upper end of which is rotatably connected to the lower end of the backrest bracket, and the mechanical extension structure further comprises a base, which is located below the base, and the lower end of the backrest drive rod is rotatably connected to the base;

[0038] Among them, when the mechanical extension structure is in a sitting position, the backrest drive rod is vertically arranged and tilted forward; when the mechanical extension structure changes from a sitting position to a TV position, the backrest drive rod rotates clockwise relative to the base; when the mechanical extension structure changes from a TV position to a lying position, the backrest support rotates clockwise relative to the backrest drive rod, and the backrest support pushes the base to move forward and upward.

[0039] One end of the driving device is rotatably connected to the base. When the mechanical extension structure is in a sitting position and the backrest driving rod is vertically arranged and tilted forward, the backrest driving rod rotates clockwise to control the movement direction of the driving device.

[0040] When the mechanical extension structure changes from a sitting position to a TV position, the backrest drive rod rotates clockwise relative to the base. This structure ensures that the backrest structure does not fall backwards during the change from a sitting position to a TV position, thereby achieving zero wall-retention of the seat unit.

[0041] Preferably, the mechanical extension structure also includes a tension spring, a hook is provided at the end of the tension spring, a mounting rod is provided on the backrest drive rod, and an annular groove cooperating with the hook is provided on the mounting rod. When the hook is inserted into the annular groove, the tension spring is hung on the mounting rod through the hook.

[0042] The annular groove is used to define the hooking position of the tension spring on the mounting rod, and prevents the hook on the tension spring from sliding relative to the mounting rod, so as to prevent the user's fingers or other parts of the body from extending into the gap between the hook and the mounting rod.

[0043] Preferably, the mechanical extension structure further comprises a tension spring, a tension hook is provided at the end of the tension spring, a mounting rod is provided on the base, and the tension spring is hung on the mounting rod through the tension hook.

[0044] Compared with the backrest driving rod, the base has the advantage of being fixed in position. Therefore, hanging the tension spring on the mounting rod of the base reduces variable factors that affect the operation of the tension spring and improves the reliability of the operation of the tension spring.

[0045] Preferably, a flexible silencer is provided on the outer wall of the draw hook, the hardness of the flexible silencer is less than the hardness of the draw hook, and when the tension spring is hung on the mounting rod through the draw hook, the flexible silencer is clamped between the draw hook and the groove wall of the annular groove.

[0046] When the hardness of the flexible silencer is less than the hardness of the pull ring and the flexible silencer is clamped between the pull hook and the groove wall of the annular groove, the flexible silencer further eliminates the gap between the pull hook and the groove wall of the annular groove through its own deformation; that is, the flexible silencer is used to further reduce the probability of the pull hook sliding relative to the mounting rod.

[0047] Preferably, the base includes two armrest boards and a crossbeam tube for connecting the sofa armrests, and the two armrest boards are directly or indirectly connected as a whole through the crossbeam tube; the mechanical extension structure also includes a driving device and a leg assembly, the driving device includes a driver, the driver is provided with a driving rod, the driver is rotatably connected to the crossbeam tube, and the leg assembly is rotatably connected to the driving rod.

[0048] Preferably, four flexible support rods are arranged on the metal base, and the height of at least two of the flexible support rods is ≥ 9 cm.

[0049] The height dimension of existing sweeping robots is usually 8cm-15mm. Therefore, when the height of at least two support rods is ≥9cm, the sweeping robot can enter the bottom of the seat unit without obstacles and clean the bottom space of the seat unit to avoid dust accumulation at the bottom of the seat unit.

[0050] Preferably, the height of the two support rods in front of the base is ≥9 cm, so that the sweeping robot can enter the bottom of the seat unit from the front of the seat unit. More preferably, the height of the four support rods in the base is ≥9 cm, so that the sweeping robot can enter the bottom of the seat unit from all directions of the seat unit.

[0051] Preferably, when the upper end of the front backrest bracket is rotationally connected to the backrest plate, a first sound-absorbing gasket is clamped between the upper end of the front backrest bracket and the backrest plate; and / or, when the lower end of the front backrest bracket is rotationally connected to the base, a second sound-absorbing gasket is clamped between the lower end of the front backrest bracket and the base.

[0052] Preferably, when the upper end of the rear bracket of the backrest is rotationally connected to the backrest plate, a third sound-absorbing gasket is clamped between the upper end of the rear bracket of the backrest and the backrest plate; and / or, when the rear bracket of the backrest is rotationally connected to the base, a fourth sound-absorbing gasket is clamped between the rear bracket of the backrest and the base.

[0053] The first, second, third and fourth noise-absorbing gaskets have the same function. Taking the first noise-absorbing gasket as an example, when the first noise-absorbing gasket is clamped between the upper end of the backrest front bracket and the backrest board, the first noise-absorbing gasket is used to increase the contact area between the backrest front bracket and the backrest board, reduce the noise during the rotation of the backrest front bracket relative to the backrest board, and reduce the gap between the backrest front bracket and the backrest board.

[0054] Preferably, a plurality of backrest hooks are provided on the backrest frame, and the ends of the backrest elastic members are hung on the backrest hooks. When the ends of the backrest elastic members are hung on the backrest hooks, a flexible backrest member is clamped between the ends of the backrest elastic members and the backrest hooks.

[0055] And / or, the seat cushion frame is provided with a plurality of seat frame hooks, and the ends of the seat cushion elastic members are hung on the seat frame hooks. When the ends of the seat cushion elastic members are hung on the seat frame hooks, a flexible seat frame member is clamped between the ends of the seat cushion elastic members and the seat frame hooks.

[0056] The flexible backrest member is used to reduce the probability of the end of the backrest elastic member sliding relative to the backrest hook, that is, the flexible backrest member prevents the user's fingers or other parts of the body from extending between the end of the backrest elastic member and the backrest hook, so as to achieve the purpose of anti-pinching of the seat unit.

[0057] The flexible seat frame member is used to reduce the probability of the end of the seat cushion elastic member sliding relative to the seat frame hook, that is, the flexible seat frame member prevents the user's fingers or other parts of the body from extending between the end of the seat cushion elastic member and the seat frame hook, so as to achieve the purpose of anti-pinching of the seat unit.

[0058] Preferably, the backrest hook and the backrest frame are integrally formed; or, a slide groove is provided on the backrest frame, and at least two hooks are connected as a whole to form a slider, and the slider can be slidably inserted in the slide groove.

[0059] The backrest hook and the backrest frame are integrally formed, and this structure can increase the connection strength between the backrest hook and the backrest frame; and at least two hooks are connected together to form a slider, and the slider can facilitate the replacement of sliders with different numbers of hooks on the backrest frame, that is, different seat units adopt different numbers of hooks to meet the needs of the backrest structure to support users of different weights.

[0060] Preferably, the backrest decorative cover is hung on the backrest frame, and the seat cushion decorative cover is hung on the seat cushion frame.

[0061] After the seat unit is used for a long time, the distribution of the backrest padding in the backrest decorative cover may become uneven, and the distribution of the seat cushion padding in the seat cushion decorative cover may also become uneven. Therefore, when the backrest decorative cover is hung on the backrest frame, the backrest decorative cover can be removed from the backrest frame and replaced; when the seat cushion decorative cover is hung on the seat cushion frame, the seat cushion decorative cover can be removed from the seat cushion frame and replaced.

[0062] Preferably, the backrest plate made of metal is snap-connected to the mounting piece made of metal, the backrest frame made of plastic is fixedly connected to the mounting piece by fasteners, and the width of the backrest hook made of plastic is three times or more of the width of the end of the backrest elastic piece.

[0063] The existing backrest frame is made of wood, while in the utility model, the backrest frame is made of plastic. Under the same volume and shape, the weight of the backrest frame made of plastic is less than the weight of the backrest frame made of wood; the backrest hook is made of plastic, and when the end of the backrest elastic member is hung on one of the backrest hooks, the backrest hook made of plastic can be deformed under the extrusion of the backrest elastic member; and "the width dimension of the backrest hook is three times or more of the width dimension of the end of the backrest elastic member" is used to improve the self-strength of the backrest hook to prevent the backrest hook from being broken by the backrest elastic member after the seat unit is used for a long time; considering the service life of the backrest hook, the service life of the backrest elastic member, the volume of the backrest hook, and the volume of the backrest elastic member, the width dimension of the backrest hook should be ≥3 times the width dimension of the end of the backrest elastic member to reduce the probability of the backrest hook being broken and the probability of the backrest elastic member being broken.

[0064] The backrest frame and the backrest hook can be made of ABS plastic, which is a terpolymer of three monomers: acrylonitrile (A), butadiene (B), and styrene (S). In addition, the backrest frame and the backrest hook can be made of PVC, which is polyvinyl chloride.

[0065] Preferably, the seat cushion frame is provided with a first mounting surface and a second mounting surface, and the base is provided with a mounting plate, which is located below the upper end surface of the base. When the seat cushion structure is installed on the base, the seat cushion frame is stacked above the mounting plate through the first mounting surface, and the seat cushion frame is stacked above the upper end surface of the base through the second mounting surface.

[0066] The first mounting surface and the second mounting surface are used to increase the connection strength between the seat cushion structure and the base, and the mounting plate is used to increase the contact area between the base and the seat cushion frame.

[0067] Preferably, the seat cushion elastic member comprises at least one serpentine spring and at least one elastic band, the two ends of the serpentine spring are arranged on the seat cushion frame, and the two ends of the elastic band are arranged on the seat cushion frame, wherein the serpentine spring and the elastic band are arranged on the seat cushion frame in a crisscross manner;

[0068] The elastic band is located below one of the serpentine springs; or, the elastic band is stretched and arranged in the middle position of one of the serpentine springs.

[0069] The serpentine spring provides support for the seat cushion cover and the seat cushion filler. Since the elastic force of the elastic belt is different from that of the serpentine spring, the elastic belt provides secondary support for the seat cushion cover and the seat cushion filler through the serpentine spring. This structure is used to increase the service life of the seat cushion structure.

[0070] The meaning of "the serpentine spring and the elastic band are arranged on the seat cushion frame in a crisscross manner" includes: one end of the serpentine spring is arranged on the front side of the seat cushion frame, the other end of the serpentine spring is arranged on the rear side of the seat cushion frame, one end of the elastic band is arranged on the left side of the seat cushion frame, and the other end of the elastic band is arranged on the right side of the seat cushion frame. In this solution, it is preferred that the elastic band is arranged below one of the serpentine springs.

[0071] The meaning of "the serpentine spring and the elastic band are arranged on the seat cushion frame in a crisscross manner" also includes: one end of the serpentine spring is arranged on the front side of the seat cushion frame, the other end of the serpentine spring is arranged on the rear side of the seat cushion frame, and the two ends of the elastic band are arranged on the left side of the seat cushion frame. In this solution, it is preferred that the elastic band is arranged in the middle position of one of the serpentine springs.

[0072] The sofa comprises at least two seat units according to any one of the above technical solutions, a frame is provided on the mechanical extension structure, and the frames on adjacent seat units are fixedly connected in a snap-fit ​​manner.

[0073] When the sofa includes two seat units, the frame is arranged on the armrest structure, and the armrest structures on adjacent seat units are fixedly connected by a snap-fit ​​manner; when the sofa includes three seat units, the frame of the leftmost seat unit is arranged on the armrest structure, the frame of the rightmost seat unit is arranged on the armrest structure, and the frame of the middle seat unit is not arranged on the armrest structure.

[0074] When the frames on adjacent seat units are fixedly connected in a snap-fit ​​manner, the sofa can be disassembled into seat units to reduce the difficulty of carrying the sofa; for example, a three-seat sofa can be carried by one porter, a three-seat sofa can enter an elevator, and a three-seat sofa can pass through a door.

[0075] When the sofa includes two seat units and is an armless structure, four flexible support rods are arranged under the base, that is, the support function of the armrest structure for the seat units is replaced by the flexible support rods.

[0076] Preferably, at least one frame is provided with a clamping block, at least one frame is provided with a clamping plate, the clamping plate is provided with a clamping groove with an upward opening, and the clamping block is inserted into the clamping groove to clamp the frames on adjacent seat units.

[0077] The sofa comprises at least two seat units described in any one of the above technical solutions, an armrest structure is provided on the mechanical extension structure, the armrest structure comprises an armrest frame, an armrest filler and an armrest decorative cover, the armrest filler is arranged on the armrest frame through the armrest decorative cover, when the armrest filler is arranged on the armrest frame through the armrest decorative cover, the upper width of the armrest structure is greater than the lower width of the armrest structure.

[0078] When the upper width of the armrest structure is greater than the lower width of the armrest structure, the contact area between the upper portion of the armrest structure and the user's arm can be increased to increase the comfort of the user when sitting on the seat unit.

[0079] Preferably, the armrest structure also includes a charging seat and a power cord, the charging seat is provided with a charging interface, the charging seat is fixedly connected to the armrest frame, the armrest frame is provided with a wire harness channel, and the power cord is electrically connected to the charging interface via the wire harness channel.

[0080] Preferably, a control switch structure corresponding to the armrest structure is provided on the seat cushion decorative cover, and the mechanical extension device includes a driving device electrically connected to the control switch structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Figure 1 It is a front view of the seat unit in the utility model;

[0082] Figure 2 It is a front view of the mechanical extension structure of the utility model in a sitting position;

[0083] Figure 3 It is a front view of the mechanical extension structure of the utility model in the TV posture position;

[0084] Figure 4 It is a front view of the mechanical extension structure of the utility model in a lying position;

[0085] Figure 5 It is a three-dimensional diagram of the mechanical extension structure of the utility model in a sitting position;

[0086] Figure 6 It is a three-dimensional diagram of the mechanical extension structure of the utility model in the TV posture position;

[0087] Figure 7It is a three-dimensional diagram of the mechanical extension structure of the utility model in a lying position. DETAILED DESCRIPTION

[0088] The present invention is further described in detail below through specific implementation examples and in conjunction with the accompanying drawings:

[0089] exist Figure 1 The utility model discloses a seat unit, which includes a backrest structure 200, a seat cushion structure 300 and a mechanical extension structure 100, wherein the mechanical extension structure 100 includes a base 1 for mounting the seat cushion structure 300 and a backrest assembly 2 for mounting the backrest structure 200;

[0090] The backrest structure 200 includes a backrest frame 2001, a backrest filler 2003, a backrest decorative cover 2004 and a backrest elastic member 2002. The backrest frame 2001 is provided with a mounting member, the backrest elastic member 2002 is arranged on the backrest frame 2001, the backrest filler 2003 is arranged on the backrest decorative cover 2004, and the backrest decorative cover 2004 is arranged on the backrest frame 2001. When the backrest device cover 2004 is arranged on the backrest frame 2001, the backrest elastic member 2002 abuts against the backrest decorative cover 2004 and provides elastic support force for the backrest device cover 2004.

[0091] The seat cushion structure 300 includes a seat cushion frame 3001, a seat cushion filler 3003, a seat cushion decorative cover 3004 and a seat cushion elastic member 3002. The seat cushion elastic member 3002 is arranged on the seat cushion frame 3001, the seat cushion filler 3003 is arranged on the seat cushion decorative cover 3004, and the seat cushion decorative cover 3004 is arranged on the seat cushion frame 3001. When the seat cushion decorative cover 3004 is arranged on the seat cushion frame 3001, the seat cushion elastic member 3002 is arranged on the seat cushion frame 3001 and provides elastic support force for the seat cushion decorative cover 3004.

[0092] The backrest assembly 2 includes a backrest plate 21, a backrest front bracket 22 and a backrest rear bracket 23. The backrest plate 21 is detachably inserted into the mounting member. The upper end of the backrest front bracket 22 is rotatably connected to the backrest plate 21, the lower end of the backrest front bracket 22 is rotatably connected to the base 1, the upper end of the backrest rear bracket 23 is rotatably connected to the backrest plate 21, and the backrest rear bracket 23 is rotatably connected to the base 1;

[0093] Among them, the front backrest bracket 22 and the rear backrest bracket 23 are located within the projection of the backrest structure 200 on the horizontal plane. When the backrest board 21 is inserted into the mounting part, the front backrest bracket 22 and the backrest decorative cover 2004 respectively abut against the seat cushion decorative cover 3004. The length distance between the front face of the backrest decorative cover 2004 and the front face of the backrest frame 2001 is L11. The height dimension of the front backrest bracket 22 above the base 1 is L3. The length distance between the upper end surface of the seat cushion decorative cover 3004 and the upper end surface of the seat cushion frame 3001 is L21. L11>L3, L21>L3.

[0094] Preferably, a backrest cavity is provided on the backrest frame 2001, and a mounting piece is provided on the wall of the backrest cavity of the backrest frame 2001, and the backrest board 21 is detachably inserted into the mounting piece. When the backrest board 21 is inserted into the mounting piece, since the mounting piece is located in the backrest cavity, at least a portion of the backrest board 21 is located in the backrest cavity. This structure prevents the user's fingers from extending into the gap between the backrest board 21 and the mounting piece to achieve the purpose of anti-pinching of the seat unit.

[0095] When the front backrest bracket 22 and the rear backrest bracket 23 are located within the projection of the backrest structure 200 on the horizontal plane, the backrest assembly 2 will not be exposed from the backrest structure 200. This structure reduces the probability of direct contact between the user's fingers and the backrest assembly 2 to achieve the purpose of anti-pinching of the seat unit.

[0096] When the backrest board 21 is inserted into the mounting part and the backrest decorative cover 2004 abuts against the seat cushion decorative cover 3004, it is more difficult for the user's fingers to pass through the gap between the backrest decorative cover 2004 and the seat cushion decorative cover 3004. When the backrest board 21 is inserted into the mounting part and the backrest front bracket 22 abuts against the seat cushion decorative cover 3004, it is more difficult for the user's fingers to enter the gap between the backrest front bracket 22 and the seat cushion decorative cover 3004.

[0097] When L11>L3, no matter how the backrest front bracket 22 rotates relative to the base 1, the backrest front bracket 22 will not move to the front of the front of the backrest decorative cover 2004; when L21>L3, no matter how the backrest front bracket 22 rotates relative to the base 1, the backrest front bracket 22 will not move above the upper end surface of the seat cushion decorative cover 3004. Since the backrest front bracket 22 will not move to the front of the front of the backrest decorative cover 2004 and will not move above the upper end surface of the seat cushion decorative cover 3004, the backrest decorative cover 2004 and the seat cushion decorative cover 3004 have the function of preventing the user's fingers, back, and buttocks from contacting the backrest front bracket 22, so as to achieve the purpose of anti-pinch of the seat unit.

[0098] exist Figure 1 In the embodiment, the maximum deformation distance between the front face of the backrest decorative cover 2004 and the front face of the backrest frame 2001 is L13, L13>L3, and the maximum deformation distance between the upper end face of the seat cushion decorative cover 3004 and the upper end face of the seat cushion frame 3001 is L23, L23>L3.

[0099] Among them, the "maximum deformation distance between the front of the backrest decorative cover 2004 and the front of the backrest frame 2001" is the length distance between the front of the backrest decorative cover 2004 and the front of the backrest frame 2001 when the backrest filler 2003 and the backrest elastic member 2002 are compressed to the limit position. The concept that the backrest filler 2003 and the backrest elastic member 2002 are compressed to the limit position is relatively vague. Since the weight of the user usually does not exceed 100kg (1 kilogram equals 1kg), therefore, in this embodiment, the "maximum deformation distance between the front of the backrest decorative cover 2004 and the front of the backrest frame 2001" is the length distance between the front of the backrest decorative cover 2004 and the front of the backrest frame 2001 after the backrest filler 2003 and the backrest elastic member 2002 are squeezed by 100kg of gravity.

[0100] The backrest filling 2003 and the seat cushion filling 3003 can be one of the materials such as sponge, natural latex, down, and artificial cotton, or the backrest filling 2003 and the seat cushion filling 3003 can be multiple materials such as sponge, natural latex, down, and artificial cotton, that is, the backrest filling 2003 and the seat cushion filling 3003 can be deformed.

[0101] When L13>L3, the probability of the backrest front bracket 22 piercing the backrest decorative cover 2004 will be reduced during the rotation of the backrest front bracket 22 relative to the base 1; when L23>L3, the probability of the backrest front bracket 22 piercing the seat cushion decorative cover 3004 will be reduced during the rotation of the backrest front bracket 22 relative to the base 1. This structure makes the seat unit have an anti-pinch function and its service life will be correspondingly increased.

[0102] Preferably, after the backrest decorative cover 2004 is deformed, its position can move from the first backrest position 20041 to the second backrest position 20042, and the length distance between the front of the backrest decorative cover 2004 at the second backrest position 20042 and the front of the backrest frame 2001 is L12, and L12>L3.

[0103] When L12>L3, even if the user leans against the backrest decorative cover 2004 at the second backrest position 20042, the user's back will not contact the backrest front bracket 22; after the seat cushion decorative cover 3004 is deformed, its position can move from the first seat cushion position 30041 to the second seat cushion position 30042. When L12>L3, even if the user sits on the seat cushion decorative cover 3004 at the second seat cushion position 30042, the user's buttocks will not contact the backrest front bracket 22. Therefore, "L12>L3" further enhances the anti-pinch effect of the seat unit.

[0104] More preferably, the shortest distance between the backrest decorative cover 2004 at the backrest second position 20042 and the backrest front bracket 22 is ≥3 cm.

[0105] When the shortest distance between the backrest decorative cover 2004 at the second backrest position 20042 and the backrest front bracket 22 is ≥3cm, the user's back will not feel the movement of the backrest front bracket 22 even if the user's back is against the backrest decorative cover 2004 at the second backrest position 20042; when the shortest distance between the backrest decorative cover 2004 at the second backrest position 20042 and the backrest front bracket 22 is ≥3cm, the user's buttocks will not feel the movement of the backrest front bracket 22 even if the user's buttocks sit on the cushion decorative cover 3004 at the second seat cushion position 30042. Therefore, "the shortest distance between the backrest decorative cover 2004 at the second backrest position 20042 and the backrest front bracket 22 is ≥3cm" further enhances the anti-pinch effect of the seat unit.

[0106] In the prior art, the thickness of the backrest filler 2003 and the seat cushion filler 3003 at different positions are different. Therefore, in this embodiment, when measuring values ​​such as length, distance, and shortest distance, the straight-line distance between the position of the backrest frame 2001 used for measurement and the seat cushion frame 3001 used for measurement and the front backrest bracket 22 shall not exceed 15 cm.

[0107] In the utility model, the mechanical extension structure has a sitting position, a TV position and a lying position. Figure 2 The mechanical extension structure 100 is in a sitting position, Figure 3 The mechanical extension structure 100 is in the TV posture, Figure 4 The mechanical extension structure 100 is in a lying position.

[0108] like Figure 1 and Figure 2 As shown, a limiting rod 11 is provided on the base 1. When the mechanical extension structure 100 is in a sitting position, the back of the backrest front bracket 22 abuts against the limiting rod 11; Figure 3 and Figure 4 As shown, when the mechanical extension structure 100 is transformed from the TV posture position to the lying position, the backrest plate 21 pushes the backrest front bracket 22 to rotate clockwise, so that the backrest front bracket 22 is separated from the limiting rod 11 and squeezes the seat cushion decorative cover 3004.

[0109] When the mechanical extension structure 100 is in the sitting position and the back of the front backrest bracket 22 abuts against the limit rod 11, the limit rod 11 is used to prevent the front backrest bracket from rotating counterclockwise; because the limit rod 11 prevents the front backrest bracket 22 from rotating counterclockwise, the front backrest bracket 22 cannot drive the backrest board 21 to continue moving, that is, when the mechanical extension structure 100 is in the sitting position, the front backrest bracket 22 cannot drive the backrest board 21 to continue moving. This structure is preferably used to achieve zero wall-bearing of the sofa unit.

[0110] During the transformation of the mechanical extension structure 100 from the TV posture position to the lying posture position, the backrest front bracket 22 is separated from the limiting rod 11, and the backrest front bracket 22 presses the cushion decoration cover 3004; since the cushion filler 3003 is arranged on the cushion decoration cover 3004 and the cushion filler 3003 can be deformed, during the process of the backrest front bracket 22 pressing the cushion decoration cover 3004, the cushion filler 3003 deforms itself, so that the cushion decoration cover 3004 always abuts against the backrest front bracket 22. This structure effectively prevents the user's fingers or other parts of the body from accidentally extending into the gap between the backrest front bracket 22 and the cushion decoration cover 3004 during the rotation of the backrest front bracket 22 around the base 1, so as to achieve the purpose of anti-pinch of the seat unit.

[0111] When the mechanical extension structure 100 is in the lying position, the seat cushion decoration cover 3004 and the seat cushion filler 3003 are sandwiched between the backrest front bracket 22 and the base 1. When the seat cushion decoration cover 3004 and the seat cushion filler 3003 are sandwiched between the backrest front bracket 22 and the base 1, it is difficult for the user's fingers to extend into the gap between the backrest front bracket 22 and the base 1.

[0112] Preferably, the seat cushion decoration cover 3004 is detachably provided on the seat cushion frame 3001, for example, the seat cushion decoration cover 3004 is hung on the seat cushion frame 3001, the seat cushion decoration cover 3004 is snap-connected to the seat cushion frame 3001, and the seat cushion decoration cover 3004 is connected to the seat cushion frame 3001 by screws.

[0113] Since the seat cushion decorative cover 3004 and the seat cushion filler 3003 are clamped between the front bracket 22 of the backrest and the base 1, when the seat cushion decorative cover 3004 is detachably provided on the seat cushion frame 3001, the user can remove the damaged seat cushion decorative cover 3004 (the seat cushion decorative cover 3004 is clamped by the front bracket 22 of the backrest and the base 1) and replace the new seat cushion decorative cover 3004 for the seat unit.

[0114] like Figure 4 As shown, the limiting rod 11 includes a base rod 111 and a limiting sleeve 112 which is sleeved on the base rod 111, and the base rod 111 is fixedly connected to the base 1. When the mechanical extension structure 100 changes from the sitting position to the TV position, the back of the backrest front bracket 22 abuts against the limiting sleeve 112; the hardness of the limiting sleeve 112 is different from the hardness of the backrest front bracket 22. Of course, in other embodiments, the limiting rod may also include only the base rod, and the hardness of the base rod is different from the hardness of the backrest front bracket.

[0115] When the back side of the front back support 22 abuts against the limiting sleeve 112, and the hardness of the limiting sleeve 112 is different from that of the front back support 22, there is no gap between the front back support 22 and the limiting sleeve 112. This structure can prevent the user's fingers or other parts of the body from extending into the gap between the front back support 22 and the limiting sleeve 112, so as to achieve the purpose of anti-pinching of the seat unit.

[0116] In addition, the limiting sleeve 112 can be replaced to increase the service life of the seat unit.

[0117] Preferably, the back of the backrest front bracket 22 is provided with a backrest limiting groove (not marked) matching the limiting sleeve 112. When the back of the backrest front bracket 22 abuts against the limiting sleeve 112, the limiting sleeve 112 is inserted into the backrest limiting groove and abuts against the groove wall of the backrest limiting groove. When the mechanical extension structure 100 changes from the sitting position to the TV position, the backrest limiting groove is used to prevent the limiting sleeve 112 from sliding relative to the backrest front bracket 22, so as to further improve the anti-pinch effect of the seat unit.

[0118] Preferably, the center point of the limit rod 11 is A1, the center point of the rotational connection between the lower end of the front backrest bracket 22 and the base 1 is A2, the interval distance between A1 and A2 is L4, the width dimension of half of the front backrest bracket 22 is L5, and L4>L5; when the mechanical extension structure changes from the TV position to the lying position, the angle between the back of the front backrest bracket and the horizontal plane is <90°.

[0119] The center point of the rotational connection between the upper end of the front back bracket 22 and the back plate 21 is A3. When A2 and A3 are connected by a dotted line, the width dimension between the dotted line and the back of the front back bracket 22 is one-half of the front back bracket 22.

[0120] In this embodiment, when the mechanical extension structure 100 is in a sitting position, the angle between the back of the front backrest bracket 22 and the horizontal plane is less than 90°. Of course, in other embodiments, when the mechanical extension structure is in a sitting position, the angle between the back of the front backrest bracket and the horizontal plane is greater than 90°; when the mechanical extension structure is in a sitting position, and the angle between the back of the front backrest bracket and the horizontal plane is greater than 90°, the limit rod is used to support the front backrest bracket to prevent the front backrest bracket from being difficult to rotate counterclockwise relative to the base; since the backrest frame is connected to the front backrest bracket through the backrest board, when the limit rod supports the front backrest bracket, the front backrest bracket will not drive the backrest frame to move backward through the backrest board; this structure effectively increases the reliability of the backrest structure supporting the user's back when the user sits in the seat unit (the mechanical extension structure of the seat unit is in a sitting position).

[0121] like Figure 3 and Figure 4As shown, when the mechanical extension structure 100 changes from the TV posture position to the lying posture position, when the angle between the back of the front backrest bracket 22 and the horizontal plane is less than 90°, the front backrest bracket 22 rotates clockwise and inevitably moves away from the limiting rod 11. This structure prevents the limiting rod 11 from interfering with the rotation of the front backrest bracket 22.

[0122] In this embodiment, the backrest assembly 2 further includes a backrest drive rod 24, the upper end of which is rotatably connected to the lower end of the backrest bracket 23, and the mechanical extension structure 100 further includes a base 3, which is located below the base 1, and the lower end of the backrest drive rod 24 is rotatably connected to the base 3;

[0123] When the mechanical extension structure 100 is in the sitting position, the backrest drive rod 24 is arranged vertically and tilted forward, such as Figure 5 Mechanical extension structure 100 changes from a sitting position to a TV position during the position, the backrest drive rod 24 rotates clockwise relative to the base 3, such as Figure 5 and Figure 6 During the mechanical extension structure 100 changes from the TV posture position to the lying position, the backrest bracket 23 rotates clockwise relative to the backrest drive rod 24, and the backrest bracket 23 pushes the base 1 forward and upward, such as Figure 6 and Figure 7 shown.

[0124] One end of the driving device 6 is rotatably connected to the base 3 . When the mechanical extension structure 100 is in a sitting position and the backrest driving rod 24 is vertically arranged and tilted forward, the backrest driving rod 24 rotates clockwise to control the movement direction of the driving device 6 .

[0125] When the mechanical extension structure 100 changes from a sitting position to a TV position, the backrest drive rod 24 rotates clockwise relative to the base 3. This structure ensures that the backrest structure 200 does not fall backwards during the change from a sitting position to a TV position, thereby achieving zero wall-retention of the seat unit.

[0126] In this embodiment, the mechanical extension structure 100 also includes a tension spring (not marked), a pull hook is provided at the end of the tension spring, a mounting rod 241 is provided on the backrest drive rod 24, and an annular groove 2411 is provided on the mounting rod 241 for cooperating with the pull hook. When the pull hook is inserted into the annular groove 2411, the tension spring is hung on the mounting rod 241 through the pull hook.

[0127] The annular groove 2411 is used to define the hooking position of the tension spring on the mounting rod 241 , and prevents the hook on the tension spring from sliding relative to the mounting rod 241 , thereby preventing the user's fingers or other parts of the body from extending into the gap between the hook and the mounting rod 241 .

[0128] In other embodiments, the mechanical extension structure further comprises a tension spring, a hook is provided at the end of the tension spring, a mounting rod is provided on the base, and the tension spring is hung on the mounting rod through the hook. Compared with the backrest driving rod, the base has the advantage of being fixed in position, so hanging the tension spring on the mounting rod of the base reduces the variable factors that affect the operation of the tension spring and improves the reliability of the operation of the tension spring.

[0129] Preferably, a flexible muffler (not marked) is provided on the outer wall of the draw hook, and the hardness of the flexible muffler is less than the hardness of the draw hook. When the tension spring is hung on the mounting rod 241 through the draw hook, the flexible muffler is clamped between the draw hook and the groove wall of the annular groove 2411, so that the flexible muffler reduces the noise generated during the matching process between the draw hook and the annular groove 2411. When the hardness of the flexible muffler is less than the hardness of the pull ring and the flexible muffler is clamped between the draw hook and the groove wall of the annular groove 2411, the flexible muffler further eliminates the gap between the draw hook and the groove wall of the annular groove 2411 through its own deformation; that is, the flexible muffler is used to further reduce the probability of the draw hook sliding relative to the mounting rod 241.

[0130] like Figure 7 As shown, the base 3 includes two armrest plates 31 and a crossbeam tube 32 for connecting the sofa armrests, and the two armrest plates 31 are directly or indirectly connected as a whole through the crossbeam tube 32; the mechanical extension structure 100 also includes a driving device 6 and a leg assembly 5, the driving device 6 includes a driver 61, and the driver 61 is provided with a driving rod 62, the driver 61 is rotatably connected to the crossbeam tube 32, and the leg assembly 5 is rotatably connected to the driving rod 62.

[0131] Preferably, four flexible support rods (not marked) are disposed on the base 3 made of metal, and the height of at least two of the flexible support rods is ≥ 9 cm.

[0132] The height dimension of existing sweeping robots is usually 8cm-15mm. Therefore, when the height of at least two support rods is ≥9cm, the sweeping robot can enter the bottom of the seat unit without obstacles and clean the bottom space of the seat unit to avoid dust accumulation at the bottom of the seat unit.

[0133] More preferably, when the base 3 is provided with four flexible support rods, the base 3 is an annular metal frame, for example, a quadrilateral metal frame, an elliptical metal frame, a hexagonal metal frame, etc.

[0134] Preferably, the height of the two support rods in front of the base 3 is ≥ 9 cm, so that the sweeping robot can enter the bottom of the seat unit from the front of the seat unit. More preferably, the height of the four support rods of the base 3 is ≥ 9 cm, so that the sweeping robot can enter the bottom of the seat unit from all directions of the seat unit.

[0135] In this embodiment, when the upper end of the front back bracket 22 is rotationally connected to the back plate 21, a first sound-absorbing gasket (unmarked) is clamped between the upper end of the front back bracket 22 and the back plate 21; and / or, when the lower end of the front back bracket 22 is rotationally connected to the base 1, a second sound-absorbing gasket (unmarked) is clamped between the lower end of the front back bracket 22 and the base 1.

[0136] In this embodiment, when the upper end of the backrest bracket 23 is rotationally connected to the backrest board 21, a third sound-absorbing gasket (unmarked) is clamped between the upper end of the backrest bracket 23 and the backrest board 21; and / or, when the backrest bracket 23 is rotationally connected to the base 1, a fourth sound-absorbing gasket (unmarked) is clamped between the backrest bracket 23 and the base 1.

[0137] The first, second, third and fourth noise-absorbing gaskets have the same functions. Taking the first noise-absorbing gasket as an example, when the first noise-absorbing gasket is clamped between the upper end of the backrest front bracket 22 and the backrest board 21, the first noise-absorbing gasket is used to increase the contact area between the backrest front bracket 22 and the backrest board 21, reduce the noise during the rotation of the backrest front bracket 22 relative to the backrest board 21, and reduce the gap between the backrest front bracket 22 and the backrest board 21.

[0138] In this embodiment, a plurality of backrest hooks (not marked) are provided on the backrest frame 2001, and the ends of the backrest elastic member 2002 are hung on the backrest hooks. When the ends of the backrest elastic member 2002 are hung on the backrest hooks, a flexible backrest member (not marked) is sandwiched between the ends of the backrest elastic member 2002 and the backrest hooks.

[0139] And / or, the seat cushion frame 3001 is provided with a plurality of seat frame hooks (not marked), and the ends of the seat cushion elastic members 3002 are hung on the seat frame hooks. When the ends of the seat cushion elastic members 3002 are hung on the seat frame hooks, a flexible seat frame member (not marked) is clamped between the ends of the seat cushion elastic members 3002 and the seat frame hooks.

[0140] The flexible backrest member is used to reduce the probability of the end of the backrest elastic member 2002 sliding relative to the backrest hook, that is, the flexible backrest member prevents the user's fingers or other parts of the body from extending between the end of the backrest elastic member 2002 and the backrest hook, so as to achieve the purpose of anti-pinching of the seat unit.

[0141] The flexible seat frame member is used to reduce the probability of the end of the seat cushion elastic member 3002 sliding relative to the seat frame hook, that is, the flexible seat frame member prevents the user's fingers or other parts of the body from extending between the end of the seat cushion elastic member 3002 and the seat frame hook, so as to achieve the purpose of anti-pinching of the seat unit.

[0142] In this embodiment, the backrest hook and the backrest frame 2001 are integrally formed; the backrest hook and the backrest frame 2001 are integrally formed, and this structure can increase the connection strength between the backrest hook and the backrest frame 2001. In other embodiments, a slide groove is provided on the backrest frame, at least two hooks are connected as a whole to form a slider, and the slider can be slidably inserted into the slide groove; at least two hooks are connected as a whole to form a slider, and the slider can facilitate the replacement of sliders with different numbers of hooks on the backrest frame, that is, different seat units use different numbers of hooks to meet the needs of the backrest structure supporting users of different weights.

[0143] In this embodiment, the backrest decoration cover 2004 is hung on the backrest frame 2001 , and the seat cushion decoration cover 3004 is hung on the seat cushion frame 3001 .

[0144] After the seat unit is used for a long time, the distribution of the backrest filler 2003 in the backrest decorative cover 2004 becomes uneven, and the distribution of the seat cushion filler 3003 in the seat cushion decorative cover 3004 also becomes uneven. Therefore, when the backrest decorative cover 2004 is hung on the backrest frame 2001, the backrest decorative cover 2004 can be removed from the backrest frame 2001 and replaced; when the seat cushion decorative cover 3004 is hung on the seat cushion frame 3001, the seat cushion decorative cover 3004 can be removed from the seat cushion frame 3001 and replaced.

[0145] Preferably, the backrest plate 21 made of metal is snap-connected to the mounting piece made of metal, the backrest frame 2001 made of plastic is fixedly connected to the mounting piece by fasteners (unmarked), and the width of the backrest hook made of plastic is three times or more of the width of the end of the backrest elastic piece 2002.

[0146] The existing backrest frame is made of wood, while in the utility model, the backrest frame 2001 is made of plastic. Under the same volume and shape, the weight of the backrest frame 2001 made of plastic is less than the weight of the backrest frame made of wood; the backrest hook is made of plastic, and when the end of the backrest elastic member 2002 is hung on one of the backrest hooks, the backrest hook made of plastic can be deformed under the extrusion of the backrest elastic member 2002; and "the width dimension of the backrest hook is three times or more of the width dimension of the end of the backrest elastic member 2002" is used to improve the self-strength of the backrest hook to prevent the backrest hook from being broken by the backrest elastic member 2002 after the seat unit is used for a long time; considering the service life of the backrest hook, the service life of the backrest elastic member 2002, the volume of the backrest hook, and the volume of the backrest elastic member 2002, the width dimension of the backrest hook should be ≥3 times the width dimension of the end of the backrest elastic member 2002, so as to reduce the probability of the backrest hook being broken and the probability of the backrest elastic member 2002 being broken.

[0147] In this embodiment, a decorative cover hook is provided on the backrest frame 2001, and the decorative cover hook is used to hang the backrest decorative cover 2004. In the prior art, a threaded hole needs to be opened on the wall of a backrest frame made of wood by an electric tool, and a fastener cooperates with the threaded hole to clamp the decorative cover hook. In this embodiment, since the backrest frame 2001 is made of plastic, the threaded hole can be integrally formed by the backrest frame. Even if the decorative cover hook is installed on the backrest frame 2001 made of plastic by other means, the difficulty of installing the decorative cover hook on the plastic backrest frame 2001 is much lower than that of installing the decorative cover hook on the wooden backrest frame 2001. Therefore, the backrest frame 2001 made of plastic will be the first choice for adapting the backrest frame to different seat units for a long time to come, especially the backrest frame 2001 used to hang the backrest decorative cover 2004.

[0148] The backrest frame 2001 and the backrest hook can be made of ABS plastic, which is a terpolymer of three monomers: acrylonitrile (A), butadiene (B), and styrene (S). In addition, the backrest frame 2001 and the backrest hook can also be made of PVC, which is polyvinyl chloride.

[0149] Preferably, the seat cushion frame 3001 is provided with a first mounting surface and a second mounting surface, and a mounting plate is provided on the base 1, and the mounting plate is located below the upper end surface of the base 1. When the seat cushion structure 300 is installed on the base 1, the seat cushion frame 3001 is stacked above the mounting plate through the first mounting surface, and the seat cushion frame 3001 is stacked above the upper end surface of the base 1 through the second mounting surface.

[0150] The first mounting surface and the second mounting surface are used to increase the connection strength between the seat cushion structure 300 and the base 1 , and the mounting plate is used to increase the contact area between the base 1 and the seat cushion frame 3001 .

[0151] In this embodiment, the seat cushion elastic member 3002 includes at least one serpentine spring (not marked) and at least one elastic band (not marked), the two ends of the serpentine spring are arranged on the seat cushion frame 3001, and the two ends of the elastic band are arranged on the seat cushion frame 3001, wherein the serpentine spring and the elastic band are arranged on the seat cushion frame 3001 in a crisscross manner;

[0152] The elastic band is located below one of the serpentine springs; or, the elastic band is stretched and arranged in the middle position of one of the serpentine springs.

[0153] The serpentine spring provides support for the cushion decoration cover 3004 and the cushion filler 3003. Since the elastic force of the elastic band is different from that of the serpentine spring, the elastic band provides secondary support for the cushion decoration cover 3004 and the cushion filler 3003 through the serpentine spring. This structure is used to increase the service life of the cushion structure 300.

[0154] The meaning of “the serpentine spring and the elastic band are arranged on the seat cushion frame 3001 in a crisscross manner” includes: one end of the serpentine spring is arranged on the front side of the seat cushion frame 3001, the other end of the serpentine spring is arranged on the rear side of the seat cushion frame 3001, one end of the elastic band is arranged on the left side of the seat cushion frame 3001, and the other end of the elastic band is arranged on the right side of the seat cushion frame 3001. In this solution, the elastic band is preferably located below one of the serpentine springs.

[0155] The meaning of “the serpentine spring and the elastic band are arranged on the seat cushion frame 3001 in a crisscross manner” also includes: one end of the serpentine spring is arranged on the front side of the seat cushion frame 3001, the other end of the serpentine spring is arranged on the rear side of the seat cushion frame 3001, and both ends of the elastic band are arranged on the left side of the seat cushion frame 3001. In this solution, it is preferred that the elastic band is arranged in the middle position of one of the serpentine springs.

[0156] The sofa comprises at least two seat units described in this embodiment. A frame is provided on the mechanical extension structure 100. The frames on adjacent seat units are fixedly connected in a snap-fit ​​manner.

[0157] When the sofa includes two seat units, the frame is arranged on the armrest structure, and the armrest structures on adjacent seat units are fixedly connected by a snap-fit ​​manner; when the sofa includes three seat units, the frame of the leftmost seat unit is arranged on the armrest structure, the frame of the rightmost seat unit is arranged on the armrest structure, and the frame of the middle seat unit is not arranged on the armrest structure.

[0158] When the frames on adjacent seat units are fixedly connected in a snap-fit ​​manner, the sofa can be disassembled into seat units to reduce the difficulty of carrying the sofa; for example, a three-seat sofa can be carried by one porter, a three-seat sofa can enter an elevator, and a three-seat sofa can pass through a door.

[0159] Preferably, at least one frame is provided with a clamping block, at least one frame is provided with a clamping plate, the clamping plate is provided with a clamping groove with an upward opening, and the clamping block is inserted into the clamping groove to clamp the frames on adjacent seat units.

[0160] The sofa includes at least two seat units described in this embodiment. An armrest structure is provided on the mechanical extension structure 100. The armrest structure includes an armrest frame, an armrest filler and an armrest decorative cover. The armrest filler is arranged on the armrest frame through the armrest decorative cover. When the armrest filler is arranged on the armrest frame through the armrest decorative cover, the upper width of the armrest structure is greater than the lower width of the armrest structure.

[0161] When the upper width of the armrest structure is greater than the lower width of the armrest structure, the contact area between the upper portion of the armrest structure and the user's arm can be increased to increase the comfort of the user when sitting on the seat unit.

[0162] Preferably, the armrest structure also includes a charging seat and a power cord, the charging seat is provided with a charging interface, the charging seat is fixedly connected to the armrest frame, the armrest frame is provided with a wire harness channel, and the power cord is electrically connected to the charging interface via the wire harness channel.

[0163] In this embodiment, a control switch structure (not marked) corresponding to the armrest structure is provided on the seat cushion decorative cover 3004, and the mechanical extension device includes a driving device electrically connected to the control switch structure, and the driving device is a driver. This structure hides the control switch structure to prevent the control switch structure from being accidentally touched and improves the aesthetics of the sofa.

[0164] In this embodiment, the upper, lower, front and rear positions of the seat unit are Figure 1 The direction indicated by the arrow is the standard.

[0165] 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 for mounting the seat cushion structure and a backrest assembly for mounting the backrest structure, wherein: The backrest structure includes a backrest frame, a backrest filler, a backrest decorative cover, and a backrest elastic member. The backrest frame is provided with a mounting member, the backrest elastic member is arranged on the backrest frame, the backrest filler is arranged on the backrest decorative cover, and the backrest decorative cover is arranged on the backrest frame. When the backrest device cover is arranged on the backrest frame, the backrest elastic member abuts against the backrest decorative cover and provides elastic support force for the backrest device cover. The seat cushion structure includes a seat cushion frame, a seat cushion filler, a seat cushion decorative cover, and a seat cushion elastic member, wherein the seat cushion elastic member is arranged on the seat cushion frame, the seat cushion filler is arranged on the seat cushion decorative cover, and the seat cushion decorative cover is arranged on the seat cushion frame. When the seat cushion decorative cover is arranged on the seat cushion frame, the seat cushion elastic member is arranged on the seat cushion frame and provides elastic support force for the seat cushion decorative cover. The backrest assembly includes a backrest plate, a front backrest bracket, and a backrest bracket. The backrest plate is detachably inserted into the mounting member. The upper end of the front backrest bracket is rotatably connected to the backrest plate, the lower end of the front backrest bracket is rotatably connected to the base, the upper end of the backrest bracket is rotatably connected to the backrest plate, and the backrest bracket is rotatably connected to the base. Among them, the front bracket of the backrest and the rear bracket of the backrest are located within the projection of the backrest structure on the horizontal plane. When the backrest plate is inserted into the mounting part, the front bracket of the backrest and the backrest decorative cover respectively abut against the seat cushion decorative cover. The length distance between the front face of the backrest decorative cover and the front face of the backrest frame is greater than the height dimension of the front bracket of the backrest above the base. The length distance between the upper end face of the seat cushion decorative cover and the upper end face of the seat cushion frame is greater than the height dimension of the front bracket of the backrest above the base.

2. The seat unit according to claim 1, characterized in that The maximum deformation distance between the front of the backrest decorative cover and the front of the backrest frame is greater than the height dimension of the backrest front bracket above the base, and the maximum deformation distance between the upper end surface of the seat cushion decorative cover and the upper end surface of the seat cushion frame is greater than the height dimension of the backrest front bracket above the base.

3. The seating unit according to claim 1, wherein: After the backrest decorative cover is deformed, the length distance between the front face of the backrest decorative cover and the front face of the backrest frame is greater than the height dimension of the backrest front bracket above the base.

4. The seat unit according to claim 3, characterized in that After the backrest decorative cover is deformed, the shortest distance between its front face and the backrest front bracket shall be ≥3cm.

5. The seating unit according to claim 1, wherein: The mechanical extension structure has a sitting position, a TV position and a lying position. A limit rod is provided on the base. When the mechanical extension structure is in the sitting position, the back of the front bracket of the backrest abuts against the limit rod. During the process of the mechanical extension structure changing from the TV position to the lying position, the backrest plate pushes the front bracket of the backrest to rotate clockwise, so that the front bracket of the backrest is separated from the limit rod and squeezes the seat cushion decorative cover.

6. The seating unit according to claim 5, characterized in that When the mechanical extension structure is in the lying position, the seat cushion trim cover and the seat cushion filling are sandwiched between the backrest front bracket and the base.

7. The seating unit according to claim 6, characterized in that The seat cushion decorative cover is detachably arranged on the seat cushion frame.

8. The seating unit according to claim 6, wherein: The limiting rod includes a base rod and a limiting sleeve arranged on the base rod. The base rod is fixedly connected to the base. When the mechanical extension structure changes from a sitting position to a TV position, the back of the front bracket of the backrest abuts against the limiting sleeve. The hardness of the limiting sleeve is different from that of the front bracket of the backrest.

9. The seating unit according to claim 8, characterized in that The back of the front backrest bracket is provided with a backrest limiting groove matching the limiting sleeve. When the back of the front backrest bracket abuts against the limiting sleeve, the limiting sleeve is inserted into the backrest limiting groove and abuts against the groove wall of the backrest limiting groove.

10. The seating unit of claim 5, wherein: The center point of the limit rod is A1, the center point of the rotation connection between the lower end of the front backrest bracket and the base is A2, the interval distance between A1 and A2 is greater than half the width of the front backrest bracket, and when the mechanical extension structure changes from the TV position to the lying position, the angle between the back of the front backrest bracket and the horizontal plane is less than 90°.

11. The seating unit according to claim 5, wherein: The backrest assembly also includes a backrest drive rod, the upper end of which is rotatably connected to the lower end of the backrest rear bracket, and the mechanical extension structure also includes a base, which is located below the base, and the lower end of the backrest drive rod is rotatably connected to the base; Among them, when the mechanical extension structure is in a sitting position, the backrest drive rod is vertically arranged and tilted forward; when the mechanical extension structure changes from a sitting position to a TV position, the backrest drive rod rotates clockwise relative to the base; when the mechanical extension structure changes from a TV position to a lying position, the backrest support rotates clockwise relative to the backrest drive rod, and the backrest support pushes the base to move forward and upward.

12. The seating unit of claim 11, wherein: The mechanical extension structure also includes a tension spring, a hook is provided at the end of the tension spring, a mounting rod is provided on the backrest driving rod, and an annular groove matching the hook is provided on the mounting rod. When the hook is inserted into the annular groove, the tension spring is hung on the mounting rod through the hook.

13. The seating unit of claim 11, wherein: The mechanical extension structure also includes a tension spring, a tension hook is arranged at the end of the tension spring, a mounting rod is arranged on the base, and the tension spring is hung on the mounting rod through the tension hook.

14. A seating unit according to claim 12 or 13, characterised in that A flexible muffler is arranged on the outer wall of the draw hook, the hardness of which is less than the hardness of the draw hook. When the tension spring is hung on the mounting rod through the draw hook, the flexible muffler is clamped between the draw hook and the groove wall of the annular groove.

15. The seating unit of claim 11, wherein: The base includes two armrest plates and a crossbeam tube, and the two armrest plates are directly or indirectly connected as a whole through the crossbeam tube; the mechanical extension structure also includes a driving device and a leg assembly, the driving device includes a driver, and the driver is provided with a driving rod, the driver is rotatably connected to the crossbeam tube, and the leg assembly is rotatably connected to the driving rod.

16. The seating unit of claim 11, wherein: The base is made of metal and is provided with four detachable flexible support rods, and the height of at least two of the flexible support rods is greater than or equal to 9 cm.

17. The seating unit of claim 1, wherein: When the upper end of the front backrest bracket is rotationally connected to the backrest plate, a first silencer gasket is clamped between the upper end of the front backrest bracket and the backrest plate; and / or, when the lower end of the front backrest bracket is rotationally connected to the base, a second silencer gasket is clamped between the lower end of the front backrest bracket and the base.

18. The seating unit of claim 1, wherein: When the upper end of the rear bracket of the backrest is rotationally connected to the backrest plate, a third silencer gasket is clamped between the upper end of the rear bracket of the backrest and the backrest plate; and / or, when the rear bracket of the backrest is rotationally connected to the base, a fourth silencer gasket is clamped between the rear bracket of the backrest and the base.

19. The seating unit of claim 1, wherein: The backrest frame is provided with a plurality of backrest hooks, and the ends of the backrest elastic members are hung on the backrest hooks. When the ends of the backrest elastic members are hung on the backrest hooks, a flexible backrest member is clamped between the ends of the backrest elastic members and the backrest hooks. And / or, the seat cushion frame is provided with a plurality of seat frame hooks, and the ends of the seat cushion elastic members are hung on the seat frame hooks. When the ends of the seat cushion elastic members are hung on the seat frame hooks, a flexible seat frame member is clamped between the ends of the seat cushion elastic members and the seat frame hooks.

20. The seating unit of claim 19, wherein: The backrest plate made of metal is snap-connected to the mounting piece made of metal, the backrest frame made of plastic is fixedly connected to the mounting piece by fasteners, and the width of the backrest hook made of plastic is three times or more of the width of the end of the backrest elastic piece.

21. The seating unit of claim 19, wherein: The backrest hook and the backrest frame are integrally formed; or, a slide groove is provided on the backrest frame, at least two hooks are connected as a whole to form a slider, and the slider can be slidably inserted in the slide groove.

22. The seating unit of claim 1, wherein: The backrest decoration cover is hung on the backrest frame, and the seat cushion decoration cover is hung on the seat cushion frame.

23. The seating unit of claim 1, wherein: The seat cushion frame is provided with a first mounting surface and a second mounting surface, and the base is provided with a mounting plate, which is located below the upper end surface of the base. When the seat cushion structure is installed on the base, the seat cushion frame is stacked above the mounting plate through the first mounting surface, and the seat cushion frame is stacked above the upper end surface of the base through the second mounting surface.

24. The seating unit of claim 1, wherein: The seat cushion elastic member includes at least one serpentine spring and at least one elastic band, the two ends of the serpentine spring are arranged on the seat cushion frame, and the two ends of the elastic band are arranged on the seat cushion frame, wherein the serpentine spring and the elastic band are arranged on the seat cushion frame in a crisscross manner; The elastic band is located below one of the serpentine springs; or, the elastic band is stretched and arranged in the middle position of one of the serpentine springs.

25. A sofa, characterized in that The invention comprises at least two seat units as claimed in any one of claims 1 to 24, wherein a frame is provided on the mechanical extension structure, and the frames on adjacent seat units are fixedly connected by snap-fitting.

26. A sofa, characterized in that The invention comprises at least two seat units as described in any one of claims 1 to 24, wherein an armrest structure is provided on the mechanical extension structure, the armrest structure comprises an armrest frame, an armrest filler and an armrest decorative cover, the armrest filler is arranged on the armrest frame through the armrest decorative cover, when the armrest filler is arranged on the armrest frame through the armrest decorative cover, the upper width of the armrest structure is greater than the lower width of the armrest structure.

27. The sofa according to claim 26, characterized in that: A control switch structure corresponding to the armrest structure is arranged on the seat cushion decorative cover, and the mechanical extension device comprises a driving device electrically connected to the control switch structure.

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