CN116035378A

CN116035378A - Leg centering type support structure and seat support

Info

Publication number: CN116035378A
Application number: CN202211132992.4A
Authority: CN
Inventors: 蔡赛军; 李晓鸿; 吴启明; 张小强
Original assignee: Ruimai Technology Co ltd
Current assignee: Ruimai Technology Co ltd
Priority date: 2022-09-16
Filing date: 2022-09-16
Publication date: 2023-05-02
Also published as: WO2024055847A1

Abstract

The invention relates to a leg centering support structure and a seat support, which comprises leg components and a transmission component, wherein the transmission component is used for being connected between two seat components of a seat, and comprises a driving cross rod and a transmission cross rod; the leg assembly comprises a leg transmission rod and a leg driving rod, the leg transmission rod is connected between two end parts of the transmission cross rod, and the leg driving rod is connected between two end parts of the driving cross rod; the middle part of the driving cross rod is used for being connected with the output end of the driving assembly and driven by the driving assembly to rotate forwards or backwards so as to drive the leg assembly to stretch out and draw back. The leg centering support structure provided by the invention can hide the leg component in the middle, so that the leg component can be prevented from being clamped to foreign matters in the telescoping process, the overall structure of the seat is stronger, the safety of the seat is improved, and the appearance aesthetic property of the seat is improved.

Description

Leg centering type support structure and seat support

Technical Field

The invention relates to the technical field of sofa supports, in particular to a leg centering support structure and a seat support.

Background

With the improvement of living standard of people, functional sofas and seats are more and more common in life. As functional seats include lounges, armchairs, sofas, combination seats, cinema seats and seating units with moving seats. The functional seat with the telescopic device can be adjusted among the sitting position, the leisure position and the lying position through the telescopic device.

The existing seating units have the following drawbacks: the leg of the traditional iron frame is required to be connected with the side plates on two sides to realize movement, is not detachable, and can be completely seen from the side edges after being packaged on a sofa, the leg is not matched with the sofa in integral color, and the risk of clamping hands when the leg stretches out and draws back.

Disclosure of Invention

In view of the foregoing problems of the prior art, it is an object of the present invention to provide a leg centering support structure and a seat support, in which a leg assembly is detachably mounted on a transmission assembly, the leg assembly moves centering, there is no risk of pinching hands during movement, the structure of the leg assembly cannot be observed on the side of a seat after mounting, and the overall structure of the seat is stronger and looks more beautiful.

In order to solve the above-mentioned problems, the present invention provides, in a first aspect, a leg centering bracket structure including a leg assembly and a transmission assembly for connection between two side seat assemblies of a seat, the transmission assembly including a drive rail and a transmission rail;

the leg assembly comprises a leg transmission rod and a leg driving rod, the leg transmission rod is connected between two ends of the transmission cross rod, and the leg driving rod is connected between two ends of the driving cross rod; the middle part of the driving cross rod is used for being connected with the output end of the driving assembly and driven by the driving assembly to rotate forwards or backwards so as to drive the leg assembly to stretch out and draw back.

Further, the drive rail is disposed parallel to the drive rail and proximate the front end of the seat assembly, the drive rail is connected to the leg drive bar at a first fixed point, and the drive rail is connected to the leg drive bar at a second fixed point.

Further, the leg assembly further includes a first intermediate bar and a second intermediate bar;

the first middle rod is hinged with the leg transmission rod, a first hinge point and a second hinge point are arranged on the second middle rod, the second middle rod is hinged with the leg driving rod at the first hinge point, the second middle rod is crossed and hinged with the middle part of the leg transmission rod at the second hinge point, and the connecting lines of the first hinge point, the second hinge point, the first fixed point and the second fixed point form a quadrangle.

Further, the included angle between the connecting line of the first fixed point and the second fixed point and the horizontal plane is not smaller than 0 degree.

Further, a limiting piece is arranged on the second middle rod, a first limiting surface matched with the limiting piece is arranged at the lower edge of the leg transmission rod, and when the first limiting surface is in contact with the limiting piece, the current position of the leg assembly is the limit position of the leg assembly stretching.

Further, the vertical distance from the plane of the second middle rod to the inner side face of the seat frame of the seat assembly at both sides is not less than 150mm.

Further, the leg assembly further includes a main foot rest, and ends of the first and second intermediate bars remote from the leg transfer bar and the leg drive bar are hinged with the main foot rest, respectively.

Further, the leg assembly further comprises a secondary foot rest and a foot rest connecting rod, the secondary foot rest is hinged with the main foot rest, one end of the foot rest connecting rod is hinged with the middle part of the secondary foot rest, and the other end of the foot rest connecting rod is hinged with the first middle rod.

The second aspect of the invention also provides a seat support, which comprises a seat assembly and the leg centering support structure, wherein the seat assembly comprises a seat frame, a first connecting leg rod, a second connecting leg rod and a seat linkage assembly, the seat linkage assembly is rotatably connected between the seat frame and a seat armrest, and the seat linkage assembly is used for supporting and driving the seat frame to move relative to the seat armrest;

one end of the first connecting rod is hinged with the front end of the seat frame at a first end point, and the other end of the first connecting rod is connected with the transmission cross rod at a second end point; one end of the second leg connecting rod is hinged with the front end of the seat frame at a third end point, the other end of the second leg connecting rod is connected with the driving cross rod at a fourth end point, and connecting lines of the first end point, the second end point, the fourth end point and the third end point form a quadrangle.

Further, the seat linkage assembly comprises a seat frame linkage assembly, and the seat frame linkage assembly comprises a first connecting frame rod, a middle linkage piece and a second connecting frame rod which are sequentially hinged;

the first connecting frame rod and the second connecting frame rod are hinged to the seat frame, and the first connecting frame rod, the middle linkage piece, the second connecting frame rod and the seat frame form a four-bar mechanism.

Further, the seat assembly further includes a leg link having one end hinged to the second leg link and the other end hinged to the intermediate link.

Further, the seat linkage assembly further comprises a translation link assembly and a side plate mounting piece, wherein the translation link assembly is rotatably connected between the seat frame linkage assembly and the side plate mounting piece, and the side plate mounting piece is used for being connected with a seat armrest.

Further, the translating link assembly includes a first rocker, a first intermediate link, a second intermediate link, and a second rocker;

the first rocker and the second rocker are both hinged to the side plate mounting piece, and the first middle connecting rod and the second middle connecting rod are hinged between the first rocker and the second rocker.

Further, the translation connecting rod assembly further comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the first rocker, the other end of the first connecting rod is hinged to the middle linkage member, one end of the second connecting rod is respectively hinged to the first middle connecting rod and the second rocker, and the other end of the second connecting rod is hinged to the middle linkage member.

Due to the technical scheme, the invention has the following beneficial effects:

the leg components are connected with the transmission component and are arranged between the seat components at two sides of the seat and arranged in the middle of the seat support, the leg components are far away from the side face of the seat, interference with the seat components at the side face is avoided, risks of clamping foreign matters or clamping hands and the like in the extending and retracting process can be avoided, and safety is improved.

The four-bar extending structure of the leg component is arranged below the transmission component, when the seat is stressed, the double-cross-bar structure of the transmission component has better stability and support, so that the leg component can be prevented from being deformed under stress, and the leg component is hidden below the seat bracket in the middle, so that the structure and the movement of the leg component can not be seen at all on the side surface of the seat, the whole structure of the finished seat is stronger, and the appearance of the seat is more attractive.

The leg component is connected with the cross bar type transmission component, so that the leg component is convenient to mount, position and detach, and the leg component is convenient to package and transport the seat support after being detached.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the following description will make a brief introduction to the drawings used in the description of the embodiments or the prior art. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic view of a seat support according to an embodiment of the present invention;

FIG. 2 is a top view of a seat support according to an embodiment of the present invention;

FIG. 3 is a schematic view of an extended seat support according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of an axis-side recumbent position of a seat support according to an embodiment of the present invention;

FIG. 5 is a schematic illustration of the construction of a translating link assembly and side plate mount according to an embodiment of the invention;

fig. 6 is a side view of a seat support according to an embodiment of the invention.

Wherein, the reference numerals are as follows: 1-leg assembly, 11-leg drive rod, 12-leg drive rod, 13-first intermediate rod, 14-second intermediate rod, 15-primary foot rest, 16-secondary foot rest, 17-foot rest link, 111-first stop surface, 121-second stop surface, 141-first hinge point, 142-second hinge point, 143-stop, 2-drive assembly, 21-drive crossbar, 22-drive crossbar, 221-first fixed point, 211-second fixed point, 3-seat assembly, 31-seat frame, 32-first leg link, 33-second leg link, 34-seat linkage assembly, 321-first end point, 322-second end point, 331-third end point, 332-fourth end point, 341-seat frame linkage assembly, 3411-first frame bar, 3412-intermediate linkage, 3413-second frame bar, 342-translating link assembly, 343-side plate mount, 3421-first rocker, 3422-first intermediate link, 3423-second intermediate link, 3424-second rocker, 3425-first connecting bar, 3426-second connecting bar, 35-leg linkage, 4-drive assembly, 41-linear pusher, 42-spindle, 5-connecting bar, 6-drive securing bar, 7-back assembly, 71-back mount, 72-seat frame connection, 73-back connector, 74-back limiter.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the feature, either explicitly or implicitly. Moreover, the terms "first," "second," and the like, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally attached; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Examples

The seat of the embodiment can be adjusted among sitting posture, stretching posture and lying posture positions, the seat is adjusted from the sitting posture to the stretching posture to be in a first adjusting stage, and the seat is adjusted from the stretching posture to the lying posture to be in a second adjusting stage. In a first adjustment phase, the seat back angle remains substantially unchanged and the leg assembly extends forward to an extreme position; during the second adjustment phase, the leg assembly and the seat frame are moved in an overall incline upward, the seat back is rotated rearward, and the angle between the back and the seat frame is increased until adjusted to the final reclined position. In this embodiment, the opposite side of the seat frame between the opposing seat assemblies is the "inboard" side, the opposite side is the "outboard" side, the leg assemblies extend in the "forward" direction, and the opposite side is the "rearward" direction.

As shown in fig. 1-6, the present embodiment provides a leg centering bracket structure, which comprises a leg assembly 1 and a transmission assembly 2, wherein the transmission assembly 2 is used for being connected between two side seat assemblies 3 of a seat, and the transmission assembly 2 comprises a driving cross rod 21 and a transmission cross rod 22; the leg assembly 1 comprises a leg transmission rod 11 and a leg driving rod 12, wherein the leg transmission rod 11 is connected between two ends of a transmission cross rod 22, and the leg driving rod 12 is connected between two ends of a driving cross rod 21; the middle part of the driving cross bar 21 is used for being connected with the output end of the driving assembly 4, and is driven by the driving assembly 4 to rotate forward or backward to drive the leg assembly 1 to stretch and retract.

Specifically, the seat assemblies 3 of the seat in the present embodiment are two groups and are disposed opposite to each other at both ends of the transmission assembly 2. The leg assemblies 1 are a group, and the leg assemblies 1 are arranged at the middle part or near the middle part of the transmission assembly 2, so that the supporting points of the legs are centered, and the stress and the support stability on the two sides of the leg assemblies are kept. The leg component 1 is far away from the seat component 3 on the side surface of the seat, interference with the side seat component 3 in telescopic movement can be avoided, and after the footrest and the soft seat bag are installed, the leg component is arranged in the middle, a user cannot touch the leg component below the soft bag, risks of clamping foreign matters or clamping hands and the like in the telescopic process can be avoided, and safety is improved.

Specifically, the transmission cross bar 22 is disposed parallel to the driving cross bar 21 and near the front end of the seat assembly 3, a second fixing point 211 is disposed on the driving cross bar 21, a first fixing point 221 is disposed on the transmission cross bar 22, the transmission cross bar 22 is connected with the leg transmission rod 11 at the first fixing point 221, and the driving cross bar 21 is connected with the leg driving rod 12 at the second fixing point 211. As shown in fig. 6, the included angle between the line connecting the first fixing point 221 and the second fixing point 211 and the horizontal plane is not less than 0 °. Preferably, the angle may be 15 °, 20 °, 25 °, 28 °, 30 °,33 °,35 °, or a period. In this embodiment, the line connecting the first fixing point 221 and the second fixing point 211 forms an angle of 28 ° with the horizontal plane. The two fixing points of the transmission component 2 and the leg component 1 are not on the same horizontal plane, so that the transmission component 2 can drive the leg component 1 to extend and retract obliquely forward smoothly during driving, and the transmission component does not interfere with a seat frame.

The driving cross bar 21 is used for rotating forward or backward under the driving of the driving component 4 and driving the driving cross bar 22 to move and the leg component 1 to extend or retract through the connecting structure of the leg component 1 and the driving cross bar 22. The transmission assembly 2 of the present embodiment is detachably mounted in cooperation with the leg assembly 1 at the first fixing point 221 and the second fixing point 211 by fasteners such as bolts and nuts, screws or rivets. The double-cross-bar transmission assembly 2 is arranged between the seat assemblies on two sides, has better stability and structural strength, and is positioned at the front end of the seat frame when the seat is stressed, and has a supporting function, so that the leg assemblies are prevented from being excessively deformed due to the sinking of the seat cushion. The leg assembly 1 is connected with the cross bar type transmission assembly, so that the leg assembly is more convenient to mount, position and detach, and the leg assembly and the transmission assembly can not be assembled before leaving the factory, and the small-size seat support after the leg assembly is detached is more convenient to package and transport.

Specifically, the leg assembly 1 further includes a first intermediate lever 13 and a second intermediate lever 14, the first intermediate lever 13 is hinged to the leg transmission lever 11, a first hinge point 141 and a second hinge point 142 are provided on the second intermediate lever 14, the second intermediate lever 14 is hinged to the leg driving lever 12 at the first hinge point 141, the second intermediate lever 14 is cross-hinged to the middle portion of the leg transmission lever 11 at the second hinge point 142, and the connection lines of the first hinge point 141, the second hinge point 142, the first fixing point 221 and the second fixing point 211 are quadrangular. Specifically, the leg transmission rod 11, the leg driving rod 12, the first middle rod 13 and the second middle rod 14 of the leg assembly 1 are telescopic connecting rod structures which are hinged in a crossed mode, and the quadrilateral telescopic structure formed by connecting lines of the first hinge point 141, the second hinge point 142, the first fixed point 221 and the second fixed point 211 enables the leg assembly 1 to extend or shrink relative to the transmission assembly 2, the telescopic structure is simple and stable in movement, the quadrilateral telescopic structure is arranged below the transmission assembly 2, and when the seat is stressed, the leg assembly can be prevented from being stressed and deformed because of better stability and support of the double cross rod structure of the transmission assembly.

Specifically, the second intermediate lever 14 is provided with a limiting member 143, the lower edge of the leg transmission lever 11 is provided with a first limiting surface 111 that is matched with the limiting member 143, and when the first limiting surface 111 is in contact with the limiting member 143, the current position of the leg assembly 1 is the limit position of the leg assembly 1 extending. The edge of the leg driving rod 12 is provided with a second limiting surface 121, and when the second limiting surface 121 is in contact with the limiting piece 143, the current position of the leg assembly 1 is the limit position of the contraction of the leg assembly 1. The limiting piece 143 is matched and abutted with the first limiting surface 111 or the second limiting surface 121 to play a role in limiting and preventing the foot rest from loosening. On one hand, the leg assembly 1 can be limited and prevented from transiting to extend or retract, so that the leg assembly cannot be smoothly retracted or extended; on the other hand, the foot rest and the foot rest are prevented from being easily released without being contracted to the predetermined limit positions. Specifically, as shown in fig. 2, the vertical distance H from the plane of the second intermediate lever 14 to the inner side surface of the seat frame 31 of the both-side seat assembly 3 is not less than 150mm. Preferably, it may be 150mm, 170mm, 180mm, 185mm, 190mm, 200mm or a distance therebetween. In this embodiment, the vertical distance from the plane of the second intermediate lever to the inner side surface of one of the side frames 31 is 178mm. The vertical distance of the plane of the second intermediate bar to the inner side of the frame 31 on both sides of the seat limits the specific position of the leg assembly 1 in the transmission assembly 2 to a position at or near the middle. When the seat is used, the compression direction of the leg assembly is positioned in the middle of the seat, so that the leg assembly is arranged in the middle, and the balance of the seat bracket is kept.

Specifically, as shown in fig. 3, the leg assembly 1 further includes a main foot rest 15, and ends of the first and second

intermediate levers

13 and 14 remote from the leg transmission lever 11 and the leg driving lever 12 are hinged to the main foot rest 15, respectively. Leg assembly 1 further comprises a secondary foot rest 16 and a foot rest link 17, the secondary foot rest 16 being hinged to the primary foot rest 15, one end of the foot rest link 17 being hinged to the middle of the secondary foot rest 16 and the other end being hinged to the first intermediate lever 13. In this embodiment, the primary foot rest 15 is for connection with a primary foot rest of the seat and the secondary foot rest 16 is for connection with a secondary foot rest of the seat. The auxiliary footrest 16 is folded and contracted under the leg assembly when in the sitting position, and the auxiliary footrest 16 is extended to the front of the main footrest 15 in a first adjustment stage of the seat from the sitting position to the extended position and in a second adjustment stage to the lying position.

The present embodiment also provides a seat support, including a seat assembly 3 and a leg centering support structure, where the seat assembly 3 includes a seat frame 31, a first leg link 32, a second leg link 33, and a seat linkage assembly 34, the seat linkage assembly 34 is rotatably connected between the seat frame 31 and a seat armrest, and the seat linkage assembly 34 is used for supporting and driving the seat frame 31 to move relative to the seat armrest; one end of the first connecting leg rod 32 is hinged with the front end of the seat frame 31 at a first end point 321, and the other end of the first connecting leg rod is connected with the transmission cross rod 22 at a second end point 322; the second leg link 33 has one end hinged to the front end of the seat frame 31 at a third end 331 and the other end connected to the driving rail 21 at a fourth end 332, and the connection lines of the first end 321, the second end 322, the fourth end 332 and the third end 331 are quadrangular. Specifically, two quadrilateral telescopic structures formed by two ends of the transmission assembly 2 and the seat frame 31, the first connecting leg rod 32 and the second connecting leg rod 33 respectively cooperate with a quadrilateral telescopic structure formed by the middle part of the transmission assembly 2 and the leg assembly 1 to realize telescopic movement of the leg assembly between sitting and lying positions.

In this embodiment, the mounting heights of the first end point 321 and the third end point 331 are lower than the mounting surface of the seat frame 31, so as to avoid the first leg link 32 and the second leg link 33 interfering with the mounting surface of the seat frame during rotation. The distance from the first end point 321 to the second end point 322 and the distance from the third end point 331 to the fourth end point 332 are each 60mm-80mm, preferably may be 60mm, 65mm, 70mm, 80mm or a distance therebetween. The distance from the first end point 321 to the second end point 322 and the distance from the third end point 331 to the fourth end point 332 in this embodiment are beneficial to compressing the space occupied by the bracket structure in the vertical direction while satisfying the rotational space of the first leg link 32 and the second leg link 33.

Specifically, as shown in fig. 4 and 5, the seat link assembly 34 includes a seat frame link assembly 341, the seat frame link assembly 341 including a first frame rod 3411, an intermediate link 3412, and a second frame rod 3413, which are sequentially hinged; the first frame rod 3411 and the second frame rod 3413 are both hinged to the seat frame 31, and the first frame rod 3411, the intermediate link 3412, the second frame rod 3413 and the seat frame 31 form a four-bar mechanism.

Specifically, the seat assembly 3 further includes a leg link 35, one end of the leg link 35 being hinged to the second leg link 33, and the other end being hinged to the intermediate link 3412. The leg link 35 connects the leg unit 1 and the seat link 34. When the leg assembly 1 is extended forwards, the seat frame 31 and the seat linkage assembly 34 are simultaneously driven to move forwards. In the first adjustment phase, the intermediate linkage 3412 remains stationary and the bezel 31 translates forward with extension of the leg assembly 1 to full extension of the leg assembly 1 by rotation of the first and

second frame links

3411, 3413.

Specifically, the seat linkage assembly 34 further includes a translating link assembly 342 and a side plate mount 343, the translating link assembly 342 being rotatably connected between the seat frame linkage assembly 341 and the side plate mount 343, the side plate mount 343 being for connection with the seat armrest. Translating linkage assembly 342 includes a first rocker 3421, a first intermediate linkage 3422, a second intermediate linkage 3423, and a second rocker 3424; first and

second rockers

3421 and 3424 are both hinged to the side plate mount 343, and first and second

intermediate links

3422 and 3423 are hinged between the first and

second rockers

3421 and 3424.

Specifically, the translating linkage assembly 342 further includes a first connecting rod 3425 and a second connecting rod 3426, one end of the first connecting rod 3425 is hinged to the first rocking rod 3421, the other end is hinged to the intermediate linkage 3412, one end of the second connecting rod 3426 is respectively hinged to the first intermediate connecting rod 3422 and the second rocking rod 3424, and the other end is hinged to the intermediate linkage 3412. In the second adjustment phase, the bezel linkage assembly 341 is translated obliquely forward and upward by movement of the translating linkage assembly 342.

Specifically, the seat bracket of the present embodiment further includes a backrest assembly 7, and the backrest assembly 7 is rotatably connected between the seat frame 31 and the side plate mount 343. The backrest assembly 7 is adapted to be coupled to a seat back for adjusting the seat back angle. The backrest assembly 7 includes a backrest mount 71, a seat frame connection 72, a backrest connection 73, and a backrest stop 74; the middle part of the seat frame connecting part 72 is connected with the seat frame 31, two ends of the seat frame connecting part 72 are respectively hinged with the backrest mounting part 71 and the backrest limiting part 74, one end of the backrest connecting part 73 is hinged with the middle part of the backrest mounting part 71, the other end of the backrest connecting part is hinged with the backrest limiting part 74, and the backrest limiting part 74 is hinged with the rear end of the side plate mounting part 343 through a connecting rod; during the second adjustment phase, the leg assembly and the seat frame integrally move obliquely upward, and the backrest limiting member 74 and the backrest connecting member 73 drive the backrest mounting member 71 to rotate rearward while the seat frame connecting portion 72 moves obliquely upward with the seat frame 31.

Specifically, the rear end of the side plate mount 343 of the seat link assembly 34 is provided with a drive fixing lever 6, and the drive assembly 4 is disposed between the drive cross bar 21 and the drive fixing lever 6. The driving assembly 4 comprises a linear pushing member 41, a link member 5 is arranged in the middle of the driving cross bar 21, and the linear pushing member 41 is rotationally connected with the link member 5 through a rotating shaft 42. The linear pushing member 41 may be a linear slider or a push rod. The driving component 4 of this embodiment is a push rod motor, the linear pushing member 41 is a linear push rod, the motor end of the driving component 4 is connected to the middle part of the driving fixed rod 6, and the motor of the driving component 4 drives the linear pushing member 41 to move in a telescopic manner, so as to drive the transmission component 2, the leg component 1, the seat component 3 and the backrest component 7 to move. In other embodiments, the drive assembly 4 may be a slider motor and the linear pusher 41 a linear slider. The seat unit of the embodiment can realize three positions of a sitting position, an extending position and a lying position under the driving of the driving component 4, and the leg component 1 and the backrest component are contracted to the limit positions in the sitting position; when the leg assembly 1 is in the extended posture position, the leg assembly is extended forwards to the limit position, and the included angle between the backrest assembly and the seat frame 31 is kept the same as the sitting posture position; when the chair is in the lying position, the leg telescopic assembly stretches to the limit position, and the backrest assembly rotates backwards to the limit position.

The present embodiment also provides a seat, including a seat back, seat armrests and a seat support, the seat support is fixedly connected with the inner side surfaces of the seat armrests through side plate mounting pieces 343 on both sides, and the seat back is connected with a backrest component 7 of the seat support.

The seat support with the leg assembly of the embodiment can be applied to a seat with a floor type seat armrest, the existing sofa seat with the armrest on the floor is mostly used for household use, the business is mostly used, and the requirements on the structural stability of the seat, the appearance of the seat and the safety are high. According to the embodiment, the leg components are connected with the transmission components and are arranged in the middle of the seat support, and when the seat is stressed, the leg components are prevented from being stressed and deformed due to the fact that the double cross rod structure of the transmission components has better stability and support. The structure of leg part subassembly is all hardly observed and touched from both sides face to this embodiment seat, can effectively avoid leg part subassembly to produce the risk of pressing from both sides foreign matter or hand in the motion in-process, and the leg part subassembly is hidden in the middle of the seat support below in the flexible in-process for finished product seat wholeness is stronger, and the seat outward appearance is more pleasing to the eye. The leg component and the cross bar type transmission component are connected, so that the leg component is convenient to mount, position and detach, and the leg component is convenient to package and transport the seat support after being detached.

The foregoing description has fully disclosed specific embodiments of this invention. It should be noted that any modifications to the specific embodiments of the invention may be made by those skilled in the art without departing from the scope of the invention as defined in the appended claims. Accordingly, the scope of the claims of the present invention is not limited to the foregoing detailed description.

Claims

1. A leg centering support structure, characterized by comprising a leg assembly (1) and a transmission assembly (2), the transmission assembly (2) being for connection between two side seat assemblies (3) of a seat, the transmission assembly (2) comprising a drive crossbar (21) and a transmission crossbar (22);

the leg assembly (1) comprises a leg transmission rod (11) and a leg driving rod (12), wherein the leg transmission rod (11) is connected between two ends of the transmission cross rod (22), and the leg driving rod (12) is connected between two ends of the driving cross rod (21); the middle part of the driving cross rod (21) is used for being connected with the output end of the driving assembly (4) and driven by the driving assembly (4) to rotate forwards or backwards to drive the leg assembly (1) to stretch.

2. A leg centering support structure as claimed in claim 1, wherein said drive rail (22) is arranged parallel to said drive rail (21) and near the front end of said seat assembly (3), said drive rail (22) being connected to said leg drive bar (11) at a first fixed point (221), said drive rail (21) being connected to said leg drive bar (12) at a second fixed point (211).

3. A leg centering support structure as claimed in claim 1, wherein the leg assembly (1) further comprises a first intermediate bar (13) and a second intermediate bar (14);

the first middle rod (13) is hinged with the leg transmission rod (11), a first hinge point (141) and a second hinge point (142) are arranged on the second middle rod (14), the second middle rod (14) is hinged with the leg transmission rod (12) at the first hinge point (141), the second middle rod (14) is hinged with the middle part of the leg transmission rod (11) at the second hinge point (142), and the connecting lines of the first hinge point (141), the second hinge point (142), the first fixed point (221) and the second fixed point (211) form a quadrangle.

4. A leg centering support structure according to claim 2, characterized in that the line connecting the first and second fixing points (221, 211) is at an angle of not less than 0 ° to the horizontal.

5. A leg centering bracket structure according to claim 3, characterized in that the second intermediate lever (14) is provided with a limiting member (143), the lower edge of the leg transmission lever (11) is provided with a first limiting surface (111) cooperating with the limiting member (143), and when the first limiting surface (111) abuts against the limiting member (143), the current position of the leg assembly (1) is the extreme position of the leg assembly (1) stretching.

6. A leg centering support structure according to claim 3, characterized in that the vertical distance from the plane of the second intermediate lever (14) to the inner side of the seat frame (31) of the seat assembly (3) on both sides is not less than 150mm.

7. A leg centering support structure as claimed in claim 3, wherein the leg assembly (1) further comprises a main foot rest (15), and wherein the ends of the first and second intermediate bars (13, 14) remote from the leg transmission bar (11) and leg drive bar (12) are hinged to the main foot rest (15), respectively.

8. A leg centering support structure as claimed in claim 7, wherein the leg assembly (1) further comprises a secondary foot rest (16) and a foot rest link (17), the secondary foot rest (16) being hinged to the primary foot rest (15), one end of the foot rest link (17) being hinged to a central portion of the secondary foot rest (16) and the other end being hinged to the first intermediate lever (13).

9. A seat support, characterized by comprising a seat assembly (3) and a leg centering support structure according to any one of claims 1-8, the seat assembly (3) comprising a seat frame (31), a first leg link (32), a second leg link (33) and a seat linkage assembly (34), the seat linkage assembly (34) being rotatably connected between the seat frame (31) and a seat armrest, the seat linkage assembly (34) being adapted to support and drive the seat frame (31) to move relative to the seat armrest;

one end of the first connecting rod (32) is hinged with the seat frame (31) at a first end point (321), and the other end of the first connecting rod is connected with the transmission cross rod (22) at a second end point (322); one end of the second leg connecting rod (33) is hinged with the front end of the seat frame (31) at a third end point (331), the other end of the second leg connecting rod is connected with the driving cross rod (21) at a fourth end point (332), and connecting lines of the first end point (321), the second end point (322), the fourth end point (332) and the third end point (331) form a quadrangle.

10. The seat support according to claim 9, wherein the seat linkage assembly (34) comprises a seat frame linkage assembly (341), the seat frame linkage assembly (341) comprising a first frame bar (3411), a middle linkage (3412) and a second frame bar (3413) hinged in sequence;

the first connecting frame rod (3411) and the second connecting frame rod (3413) are hinged on the seat frame (31), and the first connecting frame rod (3411), the middle linkage piece (3412), the second connecting frame rod (3413) and the seat frame (31) form a four-bar mechanism.

11. A seat support according to claim 10, wherein the seat assembly (3) further comprises a leg linkage (35), the leg linkage (35) being hinged at one end to the second leg linkage (33) and at the other end to the intermediate linkage (3412).

12. The seat support according to claim 11, wherein the seat linkage assembly (34) further comprises a translating link assembly (342) and a side plate mount (343), the translating link assembly (342) being rotatably connected between the seat frame linkage assembly (341) and the side plate mount (343), the side plate mount (343) being for connection with a seat armrest.

13. The seat support according to claim 12, wherein the translating link assembly (342) comprises a first rocker (3421), a first intermediate link (3422), a second intermediate link (3423) and a second rocker (3424);

the first rocker (3421) and the second rocker (3424) are both hinged on the side plate mounting (343), and the first intermediate link (3422) and the second intermediate link (3423) are hinged between the first rocker (3421) and the second rocker (3424).

14. A seat support according to claim 13, wherein the translating link assembly (342) further comprises a first connecting link (3425) and a second connecting link (3426);

one end of the first connecting rod (3425) is hinged with the first rocker (3421), the other end of the first connecting rod is hinged with the middle linkage piece (3412), one end of the second connecting rod (3426) is respectively hinged with the first middle connecting rod (3422) and the second rocker (3424), and the other end of the second connecting rod is hinged with the middle linkage piece (3412).