CN214631100U

CN214631100U - Seat back linkage mechanism

Info

Publication number: CN214631100U
Application number: CN202022752309.XU
Authority: CN
Inventors: 陈永春; 黄忠良; 陆成龙; 李文才; 李立波
Original assignee: UE Furniture Co Ltd
Current assignee: UE Furniture Co Ltd
Priority date: 2020-07-02
Filing date: 2020-11-24
Publication date: 2021-11-09
Anticipated expiration: 2030-11-24
Also published as: WO2022000968A1; CN214631129U; CN113768305A; CN113768305B

Abstract

The utility model discloses a seat back linkage mechanism, which comprises a back support piece, a seat support piece and a support seat; a first connecting rod mechanism which can enable the back support piece to tilt relative to the seat support piece is arranged between the back support piece and the seat support piece; the sitting support piece is arranged above the supporting seat, the sitting support piece is obliquely arranged relative to the horizontal plane, the front end of the sitting support piece is higher than the rear end of the sitting support piece, and a second connecting rod mechanism which enables the sitting support piece to be capable of being lifted relative to the supporting seat is arranged between the sitting support piece and the supporting seat; the tilting rod can enable the first connecting rod mechanism and the second connecting rod mechanism to be linked; one end of the tilting rod is hinged to the supporting seat, and the other end of the tilting rod is hinged to the first connecting rod mechanism or the back supporting piece; when the sitting support piece bears a user and the back support piece leans backwards under the thrust of the user, the sitting support piece synchronously lifts up around the supporting seat under the linkage action of the tilting rod and the first connecting rod mechanism; the seat and the back of the seat are linked, and the seat is simple and reliable in structure and ingenious in design.

Description

Seat back linkage mechanism

Technical Field

The utility model relates to a thing to sit on field, in particular to seat back of body link gear.

Background

When people entertain indoors and outdoors, the leisure chair is frequently used; the back rest of a typical leisure chair is inclined backwards to provide an optimal relaxation position.

At present, the man-machine size matching relationship between a backrest and a seat surface of many leisure chairs is not studied, when a user leans upward, the backrest, particularly a waist rest of a chair is separated from the waist of a human body, and the backrest and the waist rest of the chair directly form a suspension gap, so that the chair loses support for the waist of the human body in a leaning state, which is commonly called as 'waist running', the spine of the human body cannot be effectively supported, and a plurality of health problems of long sitting cannot be caused, and the user cannot well relax; meanwhile, when a user leans on the back, the hip and the seat surface are relatively fixed, and the backrest of the seat rubs upwards relative to the back of the human body, so that discomfort caused by rubbing the back and pulling clothes is caused, and the user feels unattractive.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model aims to provide a seat back linkage mechanism which is simple in operation, good in stability and in accordance with human engineering, when in use, the first connecting rod mechanism and the second connecting rod mechanism can be linked through the supporting action of the tilting rod, so that the back support piece of the seat can be tilted backwards, and simultaneously, the seat support piece can be lifted synchronously; the seat and the chair back of the chair can always fit with the human body without relative displacement, so that the back rubbing and waist running are prevented; furthermore, the force transmission is formed through the link mechanisms, when a user sits on the seat to recline and reaches a desired reclining angle, the self gravity of the user is dispersedly applied to the sitting support piece and the back support piece, and the gravity applied to the sitting support piece is transmitted to the back support piece through the first link mechanism to just form opposition with the gravity applied to the back support piece by the user and reach the force balance, so that the user can be in a natural lying state; the structural design is ingenious, so that the seat is more humanized in use.

The technical scheme of the utility model is realized like this:

a seat-back linkage mechanism comprises a back support piece, a seat support piece and a support seat; a first connecting rod mechanism which can enable the back support piece to incline relative to the seat support piece is arranged between the back support piece and the seat support piece; the sitting support piece is arranged above the supporting seat, the sitting support piece is obliquely arranged relative to the horizontal plane, the front end of the sitting support piece is higher than the rear end of the sitting support piece, and a second connecting rod mechanism which enables the sitting support piece to be lifted relative to the supporting seat is arranged between the sitting support piece and the supporting seat; the tilting rod can enable the first connecting rod mechanism and the second connecting rod mechanism to be linked; one end of the tilting rod is hinged to the supporting seat, and the other end of the tilting rod is hinged to the first connecting rod mechanism or the back supporting piece; when the sitting support piece bears a user and the back support piece leans backwards under the thrust of the user, the sitting support piece is synchronously lifted around the supporting seat under the linkage action of the tilting rod and the first connecting rod mechanism.

Preferably, the first link mechanism comprises a first guide rod and a second guide rod, a rotating support part is arranged at the lower end of the back support part, two ends of the first guide rod and the second guide rod are respectively hinged with the rotating support part and the seat support part, and a four-link mechanism is formed among the rotating support part, the first guide rod, the second guide rod and the seat support part; in the process of inclining the back support piece, the first connecting rod mechanism deforms and drives the back support piece to move forwards and downwards or upwards and backwards. The back support piece moves through the deformation of the four-bar linkage mechanism, so that the back support piece moves stably and has high structural strength.

Preferably, two sides of the rotating support part are provided with rotating side rods in a mirror image manner; the supporting seat comprises supporting side plates arranged at two sides in a mirror image manner; two ends of the warping rod are respectively hinged to the rotating side plate and the supporting side plate; and the hinge point of the warping rod on the rotating side plate is positioned between the first guide rod and the second guide rod. The linkage between the back support piece and the seat support piece is realized through the supporting function of the tilting rod, and when a user uses the chair to tilt backwards, the back support piece tilts backwards; the first connecting rod mechanism drives the warping rod to rotate around a hinge point on the supporting side plate; the tilting rod provides a reverse supporting force for the back support piece in the movement process in the rotation process, and the reverse supporting force is transmitted to the seat support piece through the first connecting rod mechanism so as to drive the seat support piece to correspondingly move.

Preferably, one end of the seesaw rod is hinged to the support base, and the other end of the seesaw rod is hinged to any one of the first guide rod, the second guide rod or the back support member. The other end of the tilting rod can be hinged on other connecting rods of the four-bar mechanism besides the rotating side plate.

Preferably, the rotating side plate extends downwards and forwards to the lower part of the sitting support so as to be staggered with the sitting support; when the back support member is tilted backwards, the rotating side plates synchronously move downwards. When the back support piece is tilted backwards, the rotating side plates move synchronously, so that the interval between the back support piece and the seat support piece is eliminated, and the back rubbing feeling is eliminated.

Preferably, the second link mechanism comprises a first rocker and a second rocker, two ends of the first rocker are respectively hinged with the front part of the seat support member and the front part of the support seat, and two ends of the second rocker are respectively hinged with the rear part of the seat support member and the rear part of the support seat; a four-bar linkage is formed among the first rocker, the second rocker, the seat support piece and the support seat; in the process that the sitting support piece is lifted relative to the supporting seat, the second connecting rod mechanism deforms to realize the upwarping and integral backward movement of the front end of the sitting support piece. The front end of the sitting support piece is tilted upwards and moves backwards integrally, so that the user can more relax when leaning; in the leisure chair, the length of the foot rest under the seat support member can be correspondingly lengthened, so that the feet of a user can be placed more comfortably.

Preferably, the seat back linkage mechanism further comprises an elastic member for applying damping when the back support is linked with the seat support. So that the user has good damping feeling in the process of using the chair.

Preferably, the elastic member is a gas spring, one end of the gas spring is hinged to the support base, and the other end of the gas spring is hinged to any one of the seat support member and the back support member.

Preferably, the gas spring is a constant force gas compression spring. The constant-force gas spring can provide fixed elastic force all the time when a user uses the seat to tilt, so that the back support piece of the seat can keep stable damping feeling when the back support piece tilts backwards at any angle, and the use is smoother and more stable.

Preferably, the back support and the seat support are both in a frame structure. The back support is a back support of the seat, and the sitting support is a sitting support of the seat.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

1. the seat back linkage mechanism of the utility model can realize linkage between the back support piece and the seat support piece through the support action of the first link mechanism, the second link mechanism and the warping rod; namely, when a user applies back thrust to the back support, the seat support can be lifted synchronously around the support seat; therefore, when a user uses the seat, the back support piece can be always attached to the back of the human body without displacement, and the seat can play a role in supporting the waist of the human body; avoid the back support piece to lean backwards to rub the back and run the waist; the structure design is ingenious and accords with human engineering mechanics.

2. Only one tilting rod is designed, namely, the motion between the first link mechanism and the second link mechanism is related; when the user lies back using the chair, the back support is reclined backwards; the first connecting rod mechanism drives the warping rod to rotate around a hinge point on the supporting side plate; the tilting rod provides a reverse supporting force for the back support piece in the movement process in the rotation process, and the reverse supporting force is transmitted to the seat support piece through the first connecting rod mechanism so as to drive the seat support piece to correspondingly move. The transmission in the pole realization is warp, and simple structure is reliable, design benefit.

3. Further, when the seat is in use by a user; when the back support piece is at a certain backward-leaning angle, the user does not actively apply back thrust any more, at the moment, the gravity applied on the sitting support piece by the user is transmitted to the back support piece through the tilting rod and the first connecting rod mechanism to form a back restoring force, and the back restoring force just forms an opposition with the gravity applied on the back support piece by the user and keeps a relative balance state of the force; so that the back support can be easily stopped at any angle; enabling the user to be in a natural lying position; the same applies to the back support at other backward angles; the structural stress is skillfully applied, so that the use of the seat is more humanized; and other kinds of seats adopt locking mechanical system or electric mechanism for reaching this effect usually like leisure chaise longue, the utility model discloses an above-mentioned structure sets up and reaches equivalent effect, practices thrift the cost, has simplified the structure.

4. The air spring with constant force is arranged, so that when the seat tilts forward, the air spring is stretched, and the damping provided by the air spring enables a user to smoothly operate in order no matter whether the user tilts backward or forward when using the seat; the chair has good damping feeling when in use, and meanwhile, when a user leaves the chair, the air spring provides resetting elasticity, so that the back support piece and the seat support piece can reset automatically, and the body feeling of the user is more comfortable; still further, the presence of the gas spring avoids the situation where the seat is triggered at will when empty.

5. The back support piece and the seat support piece on the seat move by adopting the mutually independent four-bar linkage, so that most of the acting points do not interfere in the use process of the seat, the operation is stable, and the reliability and the service life of the product are improved.

6. When the user uses the chair to lean backwards, the second connecting rod mechanism is deformed to enable the seat supporting piece to be lifted relative to the supporting seat; the front end of the sitting support piece can be tilted; so that for some leisure chairs provided with a foot rest on the sitting support; the length of the foot rest can be designed to be longer, and the foot rest is ensured not to wipe the bottom feet and the ground in the extending process; meanwhile, when the footrest frame is unfolded, the whole seat supporting piece can move backwards, so that the occupation of the front space is reduced, the front furniture or objects are not interfered, and the design is more reasonable.

Drawings

Fig. 1 is a schematic perspective view of the lower side surface of the leisure chair in the folded position according to the embodiment of the present invention;

fig. 2 is a schematic perspective view of the top of the leisure chair in the folded position according to the embodiment of the present invention;

fig. 3 is a schematic perspective view of the lower side surface of the leisure chair in the folded position according to the embodiment of the present invention;

fig. 4 is a schematic perspective view of the lower bottom of the leisure chair in the folded position according to the embodiment of the present invention;

fig. 5 is a schematic perspective view illustrating a connection between a back support and a seat support according to an embodiment of the present invention;

fig. 6 is a schematic perspective view of the first link mechanism in the embodiment of the present invention when the leisure chair is in the folded position;

fig. 7 is a schematic perspective view of the first link mechanism in the unfolded position of the leisure chair according to the embodiment of the present invention;

fig. 8 is a schematic perspective view of the second link mechanism in the embodiment of the present invention when the leisure chair is in the folded position;

fig. 9 is a schematic perspective view of the second linkage mechanism in the unfolded position of the leisure chair according to the embodiment of the present invention;

fig. 10 is a schematic perspective view illustrating the connection between the seat support and the foot rest according to the embodiment of the present invention;

FIG. 11 is an enlarged view of portion A of FIG. 10;

fig. 12 is a schematic top perspective view of the embodiment of the leisure chair of the present invention in the unfolded position;

fig. 13 is a schematic perspective view illustrating a connection relationship between the first and second foot rests and the telescopic mechanism according to the embodiment of the present invention;

fig. 14 is a schematic perspective view of the telescoping mechanism of the footrest in the embodiment of the present invention;

fig. 15 is a schematic perspective view of the back support and the rotation support in the embodiment of the present invention;

fig. 16 is an enlarged view of a portion B in fig. 15.

The figures are numbered: a seat support 1; a support base 2; a support base plate 2 a; a support side plate 2 b; a mounting hole 2 c; a chair leg component a; a vertical support rod b; a back support 3; a footrest frame 4; a first foot rest 5 a; a second foot rest 5 b; a front cross bar 6 a; a rear cross bar 6 b; a left vertical bar 7 a; a right vertical bar 7 b; connecting the longitudinal rod 8; a second link mechanism 9; a first rocker 10; a second rocker 11; a limit pin 12; a first footrest 13; a connecting vertical plate 14; rotating the connecting plate 15; a third rocker 16; the second link mechanism 17; a second footrest 18; a supporting vertical plate 19; a slide mechanism 20; a guide rail 2 a; a slider 20 b; a telescopic mechanism 21; a gimbal link 22; a first link 23; a second link 24; an upper link 24 a; a lower link 24 b; a connecting diagonal rod 24 c; a ball joint 25; a mounting plate 26; a rotation support portion 28; a support rail 28 a; the side lever 28b is rotated; a connecting frame 29; a left link 30; a right link 31; a lower cross bar 32; a mount 33; a mounting back plate 33 a; a mounting side plate 33 b; a flap 34; a holding frame 35; a clamping plate 36; the first link mechanism 37; a first guide bar 38; a second guide bar 39; a connecting plate 40; hinged vertical plate 41; a seesaw lever 42; a gas spring 43; the first connecting lug 44 a; a second engaging lug 44 b; an armrest frame 45.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present embodiment relates to reference orientations of parts, such as front, rear, etc., in a state where a user is positioned in front of the multifunctional leisure chair and facing the leisure chair.

The specific implementation manner of the utility model is as follows:

as shown in fig. 1-16, the present invention provides a seat back linkage mechanism, especially for a leisure chair used in daily life; the leisure chair as a whole will be described in detail as follows:

the leisure chair comprises a seat support part 1, a support seat 2, a back support part 3 and a chair leg component a, wherein the support seat 2 is fixedly connected with the upper end of the chair leg component a; and a foot rest 4 is also arranged on the seat support member 1 of the leisure chair.

As shown in fig. 2-5, the supporting base 2 includes a supporting bottom plate 2a and a supporting side plate 2b, the supporting side plate 2b is formed by extending along two sides of the supporting bottom plate 2a in a direction obliquely forward and upward, a mounting hole 2c is formed in the middle of the supporting bottom plate 2a, a vertical supporting rod b is disposed in the middle of the chair leg assembly a, the vertical supporting rod b can be an air rod, and the supporting bottom plate 2a and the chair leg assembly a are rotatably inserted and matched through the mounting hole 2 c.

As shown in fig. 1-4 and 8-9, the sitting support member 1 is located above the supporting seat 2, the sitting support member 1 is disposed in an inclined manner relative to the horizontal plane, the front end of the sitting support member is higher than the rear end of the sitting support member, the sitting support member 1 is a frame shaped like a Chinese character kou, the sitting support member 1 includes front and rear cross bars 6a and 6b, left and right longitudinal bars 7a and 7b, and a connecting longitudinal bar 8, the connecting longitudinal bar 8 is located between the left and right longitudinal bars 7a and 7b, and two ends of the connecting longitudinal bar 8 are respectively connected and fixed to the front and rear cross bars 6a and 6 b; as shown in fig. 8 and 9, a second link mechanism 9 is arranged between the seat support 1 and the support seat 2; the second connecting rod mechanism 9 comprises a first rocker 10 and a second rocker 11, the first rocker 10 is arranged between the front part of the sitting support member 1 and the front end position of the support side plate 2b, and two ends of the first rocker 10 are respectively hinged with the connecting longitudinal rod 8 and the support side plate 2b on the sitting support member 1; the second rocker 11 is arranged between the rear part of the seat support member 1 and the rear end position of the support side plate 2b, and two ends of the second rocker 11 are also hinged with the connecting longitudinal rod 8 on the seat support member 1 and the support side plate 2b respectively; thus, a four-bar linkage is formed among the first rocker 10, the second rocker 11, the seat support 1 and the support seat 2, namely the second linkage 9 is a four-bar linkage; the seat support 1 can be lifted backwards relative to the support base 2 by the second link mechanism 9, specifically: the leisure chair has a folding position and an unfolding position, wherein in the folding position, as shown in fig. 8, the first rocker 10 and the second rocker 11 are both inclined towards the front, and the front inclination angle of the first rocker 10 is larger than that of the second rocker 11; in the unfolded position, as shown in fig. 9, the second linkage 9 is deformed, so that the first rocker 10 and the second rocker 11 both rotate to tilt backward; the seat supporting piece 1 is tilted relative to the front end of the supporting seat 2 and moves backwards integrally; the front and rear positions of the supporting side plate 2b are respectively and correspondingly provided with a limit pin shaft 12, and when the first rocker 10 and the second rocker 11 rotate backwards to be abutted against the limit pin shaft 12; the sitting support 1 moves backward to the maximum distance.

As shown in fig. 1-4 and 10-13, the footrest 4 includes a first footrest 5a and a second footrest 5b, the first footrest 5a includes a first footrest 13 and connecting vertical plates 14 respectively connected to the left and right sides of the first footrest 13, the connecting vertical plates 14 are sheet metal members, and have high strength and economy, a rotating connecting plate 15 is correspondingly arranged at the front end of the connecting longitudinal rod 8 of the sitting support 1, and the connecting vertical plates 14 and the rotating connecting plate 15 are hinged to each other, so that the first footrest 5a can be turned around the front end of the sitting support 1; a third rocker 16 is connected between the vertical connecting plate 14 and the front part of the supporting side plate 2b, the upper end of the third rocker 16 is hinged with the vertical connecting plate 14, and the hinged position of the third rocker 16 and the vertical connecting plate 14 is positioned in front of the rotary connecting position of the vertical connecting plate 14 and the rotary connecting plate 15; the lower end of the third rocker 16 is hinged with the supporting side plate 2b, and the hinged position is positioned in front of the hinged position of the first rocker 10 and the supporting side plate 2 b; namely, a third link mechanism 17 is formed among the first rocker 10, the seat supporting piece 1, the third rocker 16, the first foot rest 5a and the supporting seat 2, and the third link mechanism 17 is a five-link mechanism; the third linkage 17 also comprises a first rocker 10, which in turn allows a linkage between the second linkage 9 and the third linkage 17.

As shown in fig. 13 and 14, the second footrest 5b is stacked on the first footrest 5a, the second footrest 5b includes a second footrest 18, and a pair of supporting vertical plates 19 disposed at intervals are disposed on two sides of the second footrest 18; the second foot rest 5b is in sliding fit with the first foot rest 5a through a sliding mechanism 20, specifically: the sliding mechanism 20 comprises a guide rail 20a and a sliding block 20b, the guide rail 20a is fixedly connected to the connecting vertical plate 14, the guide rail 28 is made of plastic materials and can reduce production cost, the sliding block 20b is strip-shaped, the sliding block 20b is fixed on two sides below the second footrest 18, the sliding block 20b is clamped and fixed between the two supporting vertical plates 19, and the supporting vertical plates 19 provide transverse supporting force for the sliding block 20b, so that the second footrest 5b can be stably unfolded and retracted along the first footrest 5a in a sliding manner.

A telescopic mechanism 21 is further arranged below the seat support member 1, the first foot rest 5a and the second foot rest 5b, the telescopic mechanism 21 can control the sliding and stretching of the second foot rest 5b, and the telescopic mechanism 21 comprises a universal joint connecting rod 22, a first connecting rod 23 and a second connecting rod 24; the first connecting rod 23 and the second connecting rod 24 are in running fit, and the first connecting rod 23 and the first foot rest 5a, and the second connecting rod 24 and the second foot rest 5b are in running fit, specifically: the first footrest 5a comprises a front footrest 13 and a rear footrest 13 which are arranged at intervals, the first connecting rod 23 is positioned below the front footrest 13, and the middle part of the first connecting rod 23 is rotationally connected with the first footrest 13 at the front end; the second connecting rod 24 comprises an upper connecting rod 24a and a lower connecting rod 24b which are staggered in height, the upper connecting rod 24a and the lower connecting rod 24b are connected through a connecting diagonal rod 24c, the upper connecting rod 24a is rotatably connected to the middle position of the front end of the second footrest 18, the lower connecting rod 24b and the first connecting rod 23 are positioned on the same horizontal plane, and the rear end of the lower connecting rod 24b is rotatably connected with the front end of the first connecting rod 23. The two ends of the universal joint connecting rod 22 are respectively connected to the first connecting rod 23 and the front cross rod 6a of the seat support member, the two ends of the universal joint connecting rod 22 are both ball joints 25, the front end of the universal joint connecting rod 22 is in rotating and swinging fit with the rear end of the first connecting rod 23, the front cross rod 6a of the seat support member is provided with a downward mounting plate 26, and the rear end of the universal joint connecting rod 22 is in rotating and swinging fit with the mounting plate 26.

As can be seen from the above, the second link mechanism 9 and the third link mechanism 17 both include the first rocker 10, that is, the two mechanisms share the first rocker 10, that is, when the second link mechanism 9 and the third link mechanism 17 deform, the first rocker 10 participates in the deformation process, so that the deformation between the second link mechanism 9 and the third link mechanism 17 generates linkage, specifically: when the sitting support piece 1 is stressed and tilts backwards relative to the supporting seat 2 through the second connecting rod mechanism 9, the sitting support piece 1 moves backwards, the upper ends of the first rocker 10 and the second rocker 11 rotate backwards around the supporting side plate 2b to a pulling-up position, and the front end of the sitting support piece 1 is lifted up and tilted upwards after the first rocker 10 is pulled up; when sitting support piece 1 front end upwarp and the motion of wholly shifting backward, third link mechanism 17 deformation makes to sit support piece 1 and can drive first foot rest 5a and overturn forward simultaneously, specifically indicates: because a five-bar linkage mechanism is formed among the sitting support member 1, the first rocker 10, the third rocker 16, the first foot rest 5a and the support seat 2, when the front end of the sitting support member 1 tilts and moves backwards, the upper end of the first rocker 10 rotates backwards, the rotating connecting plate 15 connected with the front end of the longitudinal rod 8 in the sitting support member pulls the first foot rest 5a backwards, and the third rocker 16 rotates backwards around the hinged point of the third rocker and the support side plate 2b simultaneously, so that the first foot rest 5a is driven to turn forwards relative to the sitting support member 1; meanwhile, when the first footrest 5a is turned over forwards, the universal joint connecting rod 22 rotates forwards around the mounting plate 26, the connecting end of the universal joint connecting rod 22 and the first connecting rod 23 pulls the first connecting rod 23 backwards to enable the first connecting rod 23 to rotate around the hinge point of the first connecting rod 23 and the front first footrest 13, the first connecting rod 23 rotates and drives the second connecting rod 24 to rotate, and the second connecting rod 24 rotates to enable the second footrest 5b to slide and unfold along the first footrest 5 a; when the first rocker 10 and the second rocker 11 rotate to abut against the limit pin shaft, the front end of the seat supporting piece 1 tilts upwards to the maximum height, the first connecting rod 23 and the second connecting rod 24 are in the same straight line state, the first foot rest 5a turns forwards to the maximum angle relative to the seat supporting piece 1, and the second foot rest 5b completely slides out relative to the first foot rest 5 a.

Through the linkage between the second link mechanism 9 and the third link mechanism 17, in the use process of the leisure chair, the front end of the seat support member 1 is forced to upwarp and the whole seat support member 1 moves backwards, the first foot rest 5a can form linkage with the seat support member 1, the first foot rest 5a simultaneously turns forwards, and the telescopic mechanism 21 simultaneously controls the second foot rest 5b to slide and unfold along the first foot rest 5a due to the turning of the first foot rest 5 a; the opening and closing of the footrest 4 can be completed only by controlling the movement of the sitting support piece 1, and the operation is convenient; in addition, in the process of turning and unfolding the first and second leg rest 5a, 5b, the front end of the seat support part 1 can be upwarped and lifted for a certain height, so that the foot rest 4 can be ensured not to wipe the feet and the ground in the process of extending out under the condition that the leg rest 4 is designed to be long enough; and after the footrest 4 overturns and expands, the seat support piece 1 can move backwards as a whole, so that the occupation of the front space after the footrest stretches out can be reduced, the furniture is prevented from being interfered, and the integral design is very reasonable and humanized.

As shown in fig. 1, 2, 15 and 16, the lower end of the back support 3 is connected to the seat support 1, the back support 3 is of a frame structure, a rotation support 28 is provided at the lower end of the back support 3, and the back support 3 is connected and fixed to the rotation support 28; the rotation support part 28 comprises a support cross bar 28a and rotation side bars 28b respectively connected to two sides of the support cross bar 28a, the rotation side bars 28b are formed by extending along two sides of the support cross bar 28a in a diagonal forward and downward direction, a downwardly protruding connecting frame 29 shaped like a Chinese character 'kou' is arranged at the middle position of the lower end of the back support 3, the connecting frame 29 is fixedly connected to the support cross bar 28a, and the specific connection mode is as follows: the connecting frame 29 comprises left and right connecting rods 30, 31 and a lower cross bar 32, a mounting seat 33 is correspondingly arranged at the middle position of the supporting cross bar 28a, the mounting seat 33 includes a mounting back plate 33a and mounting side plates 33b connected to both sides of the mounting back plate 33a, the mounting back plate 33a is welded at the middle position of the supporting cross bar 28a, a folded plate 34 which can cover the connecting frame 29 extends from one end of the mounting side plate 33b far away from the supporting cross bar 28a along the inner side direction, and the left and right connecting rods 30, 31 are respectively provided with a clamping frame 35, clamping plates 36 are arranged at the front and back of the clamping frame 35 to clamp the front and back ends of the left and right connecting rods 30, 31, when the device is installed, firstly, the clamping frame 35 is fixed on the left and right connecting rods 30 and 31 through screws, the connecting frame 29 is then placed in the mounting seat 33 and is connected and fixed with the mounting back plate 33a through bolts.

As shown in fig. 1 to 7, a first link mechanism 37 is disposed between the back support 3 and the seat support 1, the first link mechanism 37 includes a first guide rod 38 and a second guide rod 39, two ends of each of the first and second guide rods 38 and 39 are respectively hinged to the rotating side rod 28b and the connecting longitudinal rod 8, specifically: a vertically downward connecting plate 40 is arranged on the connecting longitudinal rod 8, and the connecting plate 40 is fixed at the rear end of the connecting longitudinal rod 8 through screw connection; a hinged vertical plate 41 extends downwards from the front end of the connecting plate 40, when the connecting plate is installed, the lower end of the first guide rod 38 is hinged with the front end of the rotating side rod 28b, and the upper end of the first guide rod 38 is hinged with the lower end of the hinged vertical plate 41; the lower end of the second guide rod 39 is hinged with the rear end of the support side plate 38b, the upper end of the second guide rod 39 is hinged with the rear end of the connecting plate 40, a limit pin shaft 12 is further arranged on the second guide rod 39, and the limit pin shaft 12 is abutted with the rotating side rod 28b to limit the rotating angle of the back support 3 relative to the support part 1; a four-bar linkage mechanism is formed among the first guide rod 38, the second guide rod 39, the seat support part 1 and the rotation support part 28 on the back support part, namely the first linkage mechanism 37 is a four-bar linkage mechanism; the back support 3 can be tilted with respect to the sitting support 1 by deformation of the first linkage 37.

As shown in fig. 1-3, when the user is in a normal sitting position, i.e. the leisure chair is in a folded position, the back support 3 approaches to the upright state of the backrest, the lower ends of the first and second guide rods 38, 39 are both inclined to the rear, and the inclination angle of the second guide rod 39 is larger; when the user reclines backward, a backward back thrust is applied to the back support 3, and the back support 3 is forced to recline, so that the rotation support 28 moves forward; the first link mechanism 37 formed between the rotating side lever 28b on the rotating support 28 and the first and second guide rods 32 and 33 and the seat support 1 is deformed, and the rotating side lever 28b moves forward to make the lower ends of the first and second guide rods 32 and 33 rotate forward around the connecting plate 40; in the process, the back support 3 connected to the rotating support part 28 tilts backwards, the angle between the back support 3 and the seat support 1 is increased, and meanwhile, the height of the lower end of the back support 3 is reduced and the back support 3 moves forwards relative to the seat support 1, so that the height of the back support 3 can be actively reduced and the back support can move forwards to fit a user in the process of tilting backwards, the 'back rubbing feeling' is eliminated, and the user can feel more comfortable; when the back support 3 is tilted backward to the full-unfolded position of the leisure chair, as shown in fig. 3 and 7, the lower ends of the first and second guide rods 32 and 33 are driven by the rotating side rod 28b to rotate forward around the first and second connecting upright plates 36a and 36b to a maximum angle, and at this time, a maximum limited angle is reached between the back support 3 and the seat support 1.

As shown in fig. 1-7, a tilting rod 42 is further disposed between the rotating side rod 28b and the supporting side plate 2b of the supporting seat 2, and the tilting rod 42 can realize the synchronous backward tilting of the back support 3 and the lifting of the seat support 1; the method specifically comprises the following steps: one end of the tilted rod 42 is hinged to the rotating side rod 28b, and a hinge point of the tilted rod 42 is located between a hinge point of the first guide rod 38 and the rotating side rod 28b and a hinge point of the second guide rod 39 and the rotating side rod 28 b; the other end of the tilting rod 42 is hinged on the supporting side rod 2 b; as shown in fig. 6 to 7, when the user lies backward using the leisure chair, the back support 3 is rotated backward by the leaning force of the user, and the first link mechanism 37 is deformed; so that the rotation support portion 28 of the lower end of the back support 3 rotates forward and moves downward; the rotating support part 28 drives the tilting rod 42 to rotate the tilting rod 42 backwards around the support side plate 2 b; the tilting rod 42 provides a reverse supporting force for the rotation supporting part 28 in the movement process in the rotation process, and the reverse supporting force is transmitted to the seat supporting part 1 through the first connecting rod mechanism 37, so that the seat supporting part 1 has a tendency of being lifted relative to the supporting seat 2, the second connecting rod mechanism 9 is correspondingly deformed, and the front end of the seat supporting part 1 tilts and integrally moves backwards; simultaneously, the third link mechanism 17 is deformed, and the leg rest 4 is turned forward and unfolded; namely, under the supporting action of the tilting rod 42, the first link mechanism 37 and the second link mechanism 9 are deformed synchronously, so that the back support member 3 tilts backwards and the seat support member 1 is lifted backwards synchronously; in the process of the movement of the seat supporting part 1, the third connecting rod mechanism 17 is driven to deform, and the foot rest 4 is synchronously turned forwards and opened; finally, the linkage of the seat, the back and the foot rest of the leisure chair is realized, so that the user only needs to apply acting force to the back-to-back support 3 by leaning backwards in the use process, and the stable transformation of the leisure chair from sitting posture, leisure posture to lying posture can be realized; when the leisure chair needs to be restored again, the leg rest 4 is pushed downwards; the operation is convenient, and various requirements of sitting posture, leisure, sleeping and the like are met; convenient to use, the body is felt better. The movement of the back support piece 3, the movement of the seat support piece 1 and the movement of the foot rest 4 all adopt mutually independent four-bar motion, so that the leisure chair runs stably in the use process, no interference exists among all acting points, the running is stable, the reliability of the product is improved, and the service life of the product is prolonged; thereby reducing unnecessary waste of the product.

One of the more important designs is: through the design of the link mechanism, when a user uses the leisure chair, the leisure chair can stay at any position between the furling position (namely the initial position) and the unfolding position (namely the final position of backward leaning), the user can sit or lie naturally at the position, and the leisure chair cannot shake. Specifically, the method comprises the following steps: when the leisure chair is in the initial folding position, if the back of the user is not in contact with the back support piece, the gravity of the user downwards acts on the sitting support piece 3, and the sitting support piece 3 is inclined at the initial position and is relatively fixed with the supporting seat 2, so that the leisure chair cannot be changed at the moment, and the leisure chair can be used by the user in a normal sitting posture state. When a user needs to lie, the back actively leans backwards on the back support 3, so that the back support 3 leans backwards, and meanwhile, the sitting support 1 is lifted and the foot rest 4 is turned forwards to open the legs; when the back support piece 3 reaches the backward-leaning angle desired by the user, the user does not exert back thrust on the back support piece 3 any more, the movement of the back support piece 3 stops, the self gravity of the user is exerted on the leisure chair at the moment, and the back support piece 3, the sitting support piece 1 and the foot rest 4 are in a stress balance state, so that the leisure chair can stay at the position and enable the user to be in a natural lying state; the method specifically comprises the following steps: at the moment, a user lies on the leisure chair, the sitting support 1 is in a lifting state, and the gravity applied to the front end of the sitting support 1 and the foot rest 4 by the user enables the leisure chair to have a folding trend; the weight force exerted by the user on the rear end of the seat support 1 and the back support 3 causes the leisure chair to tend to remain unfolded; the two are mutually resisted and are balanced in stress, so that a user can recline the leisure chair to a required reclining angle when using the leisure chair, and the use is more humanized; the comfort is higher.

As shown in fig. 1 to 4 and 12, the supporting side plates 2b on the two sides are further respectively provided with armrest frames 45, and when the user uses the leisure chair, the user can rest his hands on the armrest frames 45; the hand holding the handrail frame 45 is easier to lean backwards, so that the use is more convenient; an elastic part for applying damping when the back support part 3, the seat support part 1 and the foot rest 4 are linked is further arranged between the seat support part 1 and the support seat 2, the elastic part is an air spring 43, and specifically: a first connecting lug 44a and a second connecting lug 44b are correspondingly arranged on the front cross bar 6a and the mounting backboard 44a on the seat support member 1, the first connecting lug 44a faces downwards, the upper end of the first connecting lug 44a is fixedly connected on the front cross bar 6a, the second connecting lug 44b faces downwards, the bottom of the second connecting lug 44b is fixedly connected on the mounting backboard 44a, the head of the gas spring 43 is hinged with the first connecting lug 44a, and the tail of the gas spring 43 is hinged with the second connecting lug 44 b; the air spring 43 is a constant-force air pressure spring, and the air spring 43 is stretched in the unfolding process of the leisure chair to provide the reset elastic force of the seat support 1, so that a user can feel good damping adjustment feeling when using the leisure chair; when the leisure chair is reset, the user can be assisted to reduce the acting force on the foot rest 4; in addition, the constant-force gas spring 43 always provides fixed elastic force, so that the leisure chair can provide damping feeling with the same effect at any position in the using process, and can run more stably; the user feels better, and the use travelling comfort is higher.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. A seat back linkage mechanism is characterized in that: comprises a back support part, a seat support part and a support seat; a first connecting rod mechanism which can enable the back support piece to incline relative to the seat support piece is arranged between the back support piece and the seat support piece; the sitting support piece is arranged above the supporting seat, the sitting support piece is obliquely arranged relative to the horizontal plane, the front end of the sitting support piece is higher than the rear end of the sitting support piece, and a second connecting rod mechanism which enables the sitting support piece to be lifted relative to the supporting seat is arranged between the sitting support piece and the supporting seat; the tilting rod can enable the first connecting rod mechanism and the second connecting rod mechanism to be linked; one end of the tilting rod is hinged to the supporting seat, and the other end of the tilting rod is hinged to the first connecting rod mechanism or the back supporting piece; when the sitting support piece bears a user and the back support piece leans backwards under the thrust of the user, the sitting support piece is synchronously lifted around the supporting seat under the linkage action of the tilting rod and the first connecting rod mechanism.

2. The seat back linkage of claim 1, wherein: the first connecting rod mechanism comprises a first guide rod and a second guide rod, a rotating support part is arranged at the lower end of the back support part, two ends of the first guide rod and the second guide rod are respectively hinged with the rotating support part and the seat support part, and a four-connecting-rod mechanism is formed among the rotating support part, the first guide rod, the second guide rod and the seat support part; in the process of inclining the back support piece, the first connecting rod mechanism deforms and drives the back support piece to move forwards and downwards or upwards and backwards.

3. The seat back linkage mechanism of claim 2, wherein: rotating side rods are arranged on two sides of the rotating supporting part in a mirror image mode; the supporting seat comprises supporting side plates arranged at two sides in a mirror image manner; two ends of the warping rod are respectively hinged to the rotating side plate and the supporting side plate; and the hinge point of the warping rod on the rotating side plate is positioned between the first guide rod and the second guide rod.

4. The seat back linkage mechanism of claim 2, wherein: one end of the tilting rod is hinged on the supporting seat, and the other end of the tilting rod is hinged on any one of the first guide rod, the second guide rod or the back support piece.

5. A seat back linkage according to claim 3, wherein: the rotating side plate extends downwards and forwards to the lower part of the sitting support part so as to be staggered with the sitting support part; when the back support member is tilted backwards, the rotating side plates synchronously move downwards.

6. The seat back linkage of claim 1, wherein: the second connecting rod mechanism comprises a first rocker and a second rocker, two ends of the first rocker are respectively hinged with the front part of the sitting support piece and the front part of the supporting seat, and two ends of the second rocker are respectively hinged with the rear part of the sitting support piece and the rear part of the supporting seat; a four-bar linkage is formed among the first rocker, the second rocker, the seat support piece and the support seat; in the process that the sitting support piece is lifted relative to the supporting seat, the second connecting rod mechanism deforms to realize the upwarping and integral backward movement of the front end of the sitting support piece.

7. The seat back linkage of claim 1, wherein: the seat back linkage mechanism also comprises an elastic piece for applying damping when the back support piece is linked with the seat support piece.

8. The seat back linkage of claim 7, wherein: the elastic part is a gas spring, one end of the gas spring is hinged with the supporting seat, and the other end of the gas spring is hinged with any one of the seat supporting part or the back supporting part.

9. The seat back linkage of claim 8, wherein: the air spring is a constant force air pressure spring.

10. The seat back linkage of claim 1, wherein: the back support piece and the seat support piece are both in frame type structures.