WO2015066943A1

WO2015066943A1 - Rotatable multi-link stretching mechanism for electric movable sofa and operating method therefor

Info

Publication number: WO2015066943A1
Application number: PCT/CN2013/087163
Authority: WO
Inventors: 奚如忠; 柯建峰; 高恒
Original assignee: 江苏舒意达机械有限公司
Priority date: 2013-11-11
Filing date: 2013-11-14
Publication date: 2015-05-14
Also published as: CN104622084A

Abstract

A multi-link stretching mechanism for an electric movable sofa, with slower leg lifting and back laying actions of the sofa and higher comfortability in use, comprises a foot plate support (v), a foot rest (w), a backrest piece (m), a stretching mechanism for driving the foot plate support (v) and the foot rest (w) to move towards the front and upper direction and then driving the backrest piece (m) to tip backwards, and an electrical driving mechanism (k) for driving the stretching mechanism. The electrical driving mechanism (k) is connected between an upper rotating rod and a lower rotating rod (s, j) and is used for controlling the upper rotating rod and the lower rotating rod (s, j) to rotate relatively and expanding the space therebetween thus driving the stretching mechanism, so as to drive the foot plate support (v) and the foot rest (w) to move towards the front and upper direction and then drive the backrest piece (m) to tip backwards. Hence, the leg lifting and back laying actions of the sofa are slower in speed and stable, so that the comfortability in use is higher.

Description

Rotatable multi-link stretching mechanism for electric activity sofa and working method thereof

The invention relates to a rotatable multi-link stretching mechanism for an electric activity sofa, wherein the stretching mechanism adopts electric control, so that the lifting leg and the back movement of the sofa are more soothing and the use comfort is higher.

China Patent Notice No. CN 202014873 U discloses a multifunctional sofa mechanical stretching and rotating device comprising a stretching mechanism, a rotating mechanism, a rocking mechanism, a traction mechanism, a footrest bracket, a footrest, a backrest member and the like. The rotating mechanism comprises two square plates and a circular base frame; and two rotating plates are arranged between the two square plates, and the two square plates are installed in the middle of the circular base frame. It realizes the combination of mechanical stretching and rotation.

The shortcoming of the above prior art is that the sofa realizes the action of lifting the leg and backing, and the action of the stretching mechanism driven by the spring is required to be touched by the handle. This causes the leg lift and back movement of the sofa to be faster and unstable, so the use comfort is lower.

The technical problem to be solved by the present invention is to provide a multi-link stretching mechanism for a motorized sofa with a simple structure, a lifting leg and a backing action of the sofa, and a high comfort.

In order to solve the above technical problem, the present invention provides a multi-link stretching mechanism for an electric activity sofa, comprising: a foot plate bracket v, a footrest w, and a backrest member m for driving the foot plate bracket v and the footrest w forward An extension mechanism for displacing the upper portion of the backrest member m, and for driving the extension mechanism, the electric drive mechanism k for driving the extension mechanism; the extension mechanism includes: a chassis a, and the left and right sides of the chassis a are fixedly provided with a vertical The inner side plate b, the front and rear ends of the inner side plates b are respectively movably connected with the front and rear swinging pieces c, d, and the inner limiting rods e are respectively connected between the two front swinging pieces c and the two rear swinging pieces d, The bottom ends of the front and rear swinging pieces c and d on the same inner side panel b are respectively hinged on the bottom edge of an L-shaped bottom rod g, and the center of the bottom side of each L-shaped bottom rod g is respectively associated with a first transmission plate z1. The bottom end is movably connected, and the top end of the first transmission plate z1 is movably connected to the bottom end of a second transmission plate z2; each of the first transmission plates z1 is fixedly connected to both ends of the lower rotation rod j through a transition plate i; The top end of the drive plate z2 is movably connected to the middle rear portion of the first link r1, the first link The rear end of r1 has a waist hole r7 which is movably connected with the free end of the front side of the bottom edge of the L-shaped back plate m, and the front end of the first link r1 and the vertical end of the L-shaped bottom bar g are movable. Connecting, the middle portion of the first link r1 is movably connected with the middle portion of the mounting side plate h for mounting the sofa frame, and the rear end of the mounting side plate h is movably connected with the middle upper edge of the back plate m, and the middle lower edge of the back plate m Connected to the top end of a limiting plate n, the middle and lower parts of the limiting plate n are provided with a waist-shaped limiting hole n1, an end angle of a triangular connecting block q and a rear end of an arc-shaped connecting rod p are simultaneously provided at the same The two sides of the waist-shaped limiting hole n1 are spliced by a rivet passing through the waist-shaped limiting hole n1, and the other end of the triangular connecting block q is movably connected with the corner end of the L-shaped backrest member m, and the triangular connecting block The third end of the q is movably connected to the top end of the sixth connecting rod r6, and the bottom end of the sixth connecting rod r6 is movably connected with the free end of the bottom side of the bottom edge of the L-shaped bottom rod g, and the two sixth connecting rods r6 are fixedly connected. At both ends of the outer positioning rod f, the front end of the curved connecting rod p is movably connected with the corner end of a 7-shaped second connecting rod r2, and the second connecting rod r2 The short side end is movably connected with the bottom front edge of the mounting side plate h, the front end of the mounting side plate h is movably connected with the rear end of a third link r3, and the front end of the second link r2 and a fourth link The rear end of the r4 is movably connected, the middle front portion of the third link r3 is movably connected to the middle rear portion of the fourth link r4, and the front end of the third link r3 is movably connected to the bottom end of a fifth link r5. The middle portion of the five-bar linkage r5 is movably connected to the bottom end of the foot plate bracket v, the middle portion of the foot plate bracket v is movably connected with the middle portion of the fourth link r4, and the fourth link r4 and the top end of the fifth link r5 are respectively movably connected. At the bottom of a footrest w, the middle of the two second links r2 is fixedly connected to both ends of an upper rotating rod s through a transition connecting block; on the mounting side plate h, adjacent to both ends of the first connecting rod r1 The upper and lower portions are respectively provided with first and second limiting posts t1 and t2 extending inwardly. When the multi-link stretching mechanism is in a contracted state, the pair of limiting posts respectively act adjacent to the first connecting rod r1. a limit notch u at the upper and lower edges of the two ends; the electric drive mechanism k is coupled to the upper and lower rotating rods s, j For controlling the relative rotation of the upper and lower rotating rods s, j and expanding the spacing to drive the stretching mechanism to move the foot plate bracket v and the footrest w first to move forward and upward, and then to drive the backrest member m to After dumping.

Further preferably, the central upper edge of the bottom edge of the L-shaped bottom bar g is movably connected to the front end of an inverted V-shaped positioning piece x, and the rear end of the positioning piece x is movably connected with a free end of a V-shaped transmission block y. The other free end of the transmission block y is movably connected to the middle rear portion of the curved link p, and the positioning pin d1 is provided at the lower end of the U-shaped positioning groove x1 at the center bottom of the positioning piece x and at the center of the rear swing piece d For engaging with the U-shaped positioning groove x1; when the backrest member m starts to tilt backward, the positioning pin d1 on the swinging piece d starts to be embedded in the U-shaped positioning groove x1 of the positioning piece x. That is, the lock is formed to prevent the sofa from swaying before and after the backrest member m is dumped and after the dumping is completed, thereby ensuring the comfortable use of the lying state.

Further preferably, the electric drive mechanism k is an electric screw mechanism, comprising: a motor base k2 hinged on the hinge seat at the bottom of the upper rotating rod s, a motor k3 on the motor base k2, and one end connected to the motor base The screw sleeve k4 on k2, the screw sleeve k4 is provided with grooves on both sides thereof, and the screw sleeve k4 is provided with a screw matched with the motor k3; the hinge seat of the lower rotation rod j is hinged with a pair of swinging pieces k5, the swinging piece k5 A slider k6 which is screwed with the screw is fixed between the screw k6, and the inner side of the slider k6 has a protrusion which is engaged with the screw thread in the two slots embedded in the screw sleeve k4; the motor seat k2 is provided There is a controller, and both ends of the screw sleeve k4 are respectively provided with a limit switch connected to the controller; when the slider k6 touches the limit switch, the controller controls the motor k3 to stop working.

Further preferably, the chassis a is disposed on a rotating mechanism, and the rotating mechanism is fixed to a chassis 8.

The working method of the multi-link stretching mechanism described above is characterized by:

When the multi-link stretching mechanism is in the contracted state, that is, the sofa is in the sitting state, the motor k3 is turned on to drive the screw to rotate, and the corresponding torque is generated on the upper and lower rotating rods s, j under the cooperation of the screw and the slider k6. And the spacing is gradually increased, the torsion generated on the lower rotating rod j is transmitted to the first connecting rod r1 via the transition plate i, the first transmission plate z1 and the second transmission plate z2, due to the first and second on the mounting plate h The limit columns t1 and t2 respectively act on the corresponding limit notches u, and the movable connection point of the first transmission plate z1 and the first link r1 is between the contraction first and second limit columns t1 and t2, so The first link r1 is temporarily inoperable; at this time, only the upper rotating lever s rotates and moves forward and upward;

The upper rotating rod s drives the foot plate bracket v, the footrest plate w to extend forward and upward, while lifting the mounting plate h from the front end;

When the stretching operation of the foot plate bracket v and the footrest plate w is completed, the distance between the upper and lower rotating rods s and j of the motor k3 is continuously increased, and the first and second limiting columns t1 and t2 are respectively separated from the corresponding limits. The notch u, in turn, raises the first link r1 to drive the backrest member m to tilt backwards until reaching a preset limit angle, that is, the multi-link stretching mechanism reaches a fully extended state, that is, the sofa is lying .

When the backrest member m starts to tilt backward, the positioning pin d1 on the swinging piece d starts to be embedded in the U-shaped groove of the positioning piece x, that is, the locking is formed to prevent the sofa from falling during the dumping of the backrest member m Shake before and after completion.

The rotating mechanism includes: upper and lower casings, a plurality of balls disposed between the upper and lower casings, and a ball cage for limiting the balls, disposed between the upper and lower casings and at a brush assembly in the center of the ball cage; the brush assembly comprises: upper and lower annular bodies, at least one pair of upper and lower symmetrical annular grooves are distributed on adjacent end faces of the upper and lower annular bodies, and one of the lower end faces of the upper annular body A plurality of conductive contacts are distributed in the annular groove, and the conductive contacts in the same annular groove are connected to a single power line; a pair of annular grooves on the upper end surface of the lower ring body are respectively connected to an external power line Ring metal ring.

As a preferred solution, the conductive contacts in the same annular groove are elastic metal sheets adapted to contact the annular metal ring below them and are evenly distributed.

As a further preferred solution, the ball cage is disposed coaxially with the brush assembly, and the upper and lower casings are fixed up and down by the center bolt.

The beneficial effects of the present invention are embodied in:

In the multi-link stretching mechanism for an electric activity sofa according to the present invention, the electric driving mechanism is coupled between the upper and lower rotating rods for controlling the relative rotation of the upper and lower rotating rods and expanding the spacing to drive the stretching. The action of the mechanism causes the foot plate bracket and the footrest to be displaced upward and upward, and then the backrest member is tilted backward. Further, the lifting leg and the backing movement speed of the sofa are relatively gentle and the movement is stable, so the use comfort is high;

2 In the rotating mechanism, the brush assembly is used to realize the rotation cooperation of the power source, specifically, the conductive contacts in the pair of annular grooves on the upper annular body and the annular metal in the pair of annular grooves on the lower annular body respectively. The active cooperation of the circle keeps the power supply always on, thereby avoiding the entanglement of the power supply cable under the continuous 360° rotation of the sofa, which is convenient for the user to use, and improves the comfort and reliability of the product use;

In the present invention, under the action of the front and rear swinging pieces on the two inner side plates, when the sofa is in the sitting position, the front and rear shaking can be realized, and the rocking chair function can be realized. Each limit rod, the upper and lower rotating rods, can prevent the left and right multi-link assemblies from shaking left and right, ensuring the stability of the sofa and the comfort of use.

In order to clarify the detailed structure of the multi-functional sofa stretching mechanism and the technical advantages of the prior art, one possible embodiment will be explained below by means of a non-limiting example of applying the principle by means of the drawings. In the picture:

1 is a schematic view showing the internal structure of the rotating mechanism for the electric activity sofa;

2 is a schematic structural view of an upper casing in the rotating mechanism;

Figure 3 is a cross-sectional structural view of the upper annular body in the rotating mechanism;

Figure 4 is an assembled structural view of the upper and lower annular bodies in the rotating mechanism;

Figure 5 is a structural schematic view showing the rotatable multi-link stretching mechanism of the electric activity sofa in a contracted state, that is, the sofa is in a sitting state;

Figure 6 is a side structural view of the multi-link stretching mechanism in a semi-stretched state;

Figure 7A is a side structural view of the multi-link stretching mechanism in a fully extended state;

Figure 7B is a partial structural view of the multi-link stretching mechanism;

Figure 8 is a perspective structural view of the multi-link stretching mechanism in a fully extended state;

Figure 9 is a plan view of the Figure 7A;

Figure 10 is a structural view of the inner side surface of the multi-link stretching mechanism of Figure 5;

Figure 11 is a perspective view of the Figure 10;

Figure 12 is a structural view showing the inner side surface of the multi-link stretching mechanism of Figure 6;

Figure 13 is a perspective view of the Figure 12;

Figure 14 is a structural view showing the inner side surface of the multi-link stretching mechanism of Figure 7;

Fig. 15 is a perspective view of the same as Fig. 14;

As shown in FIGS. 5 to 15, the multi-link stretching mechanism of the present embodiment includes a foot plate bracket v, a footrest w, and a backrest member m for driving the foot plate bracket v and the footrest w to be displaced forward and upward, and then driving the backrest member m. a stretching mechanism for backward tilting, an electric driving mechanism k for driving the stretching mechanism; the stretching mechanism includes: a chassis a, and a vertical inner side plate b fixed to the left and right sides of the chassis a, each inner side The front and rear ends of the plate b are respectively movably connected with the front and rear swinging pieces c and d, and the inner limiting rods e are respectively connected between the two front swinging pieces c and the two rear swinging pieces d, and the front side of the same inner side plate b is The bottom ends of the rear swinging pieces c and d are respectively hinged on the bottom edge of an L-shaped bottom rod g, and the center of the bottom edge of each L-shaped bottom rod g is movably connected to the bottom end of a first transmission plate z1, respectively. The top end of the plate z1 is movably connected to the bottom end of a second transmission plate z2; each of the first transmission plates z1 is fixedly connected to both ends of the lower rotating rod j through a transition plate i; the top end of the second transmission plate z2 is first The middle rear portion of the connecting rod r1 is movably connected, and the rear end of the first connecting rod r1 has a waist hole r7, and the waist hole r7 and the L shape The free end of the front side of the bottom edge of the back plate m is movably connected, and the front end of the first link r1 is movably connected with the top end of the vertical edge of the L-shaped bottom bar g, and the middle portion of the first link r1 and the mounting side for mounting the sofa frame The middle portion of the plate h is movably connected, and the rear end of the mounting side plate h is movably connected with the central upper edge of the back plate m. The middle lower edge of the back plate m is movably connected with the top end of a limiting plate n, and the lower middle portion of the limiting plate n a waist-shaped limiting hole n1 is provided, an end corner of a triangular connecting block q and a rear end of a curved connecting rod p are simultaneously disposed on both sides of the waist-shaped limiting hole n1, and pass through the waist shape The rivet of the limiting hole n1 is spliced by the rivet, and the other end of the triangular connecting block q is movably connected with the corner end of the L-shaped backrest member m, and the third end of the triangular connecting block q is movably connected with the top end of a sixth connecting rod r6, The bottom end of the sixth connecting rod r6 is movably connected with the free end of the bottom side of the bottom edge of the L-shaped bottom rod g, and the two sixth connecting rods r6 are fixedly connected at both ends of the outer positioning rod f, the front end of the curved connecting rod p and a 7-shaped shape The angled end of the second link r2 is movably connected, and the short side end of the second link r2 and the bottom front edge of the mounting side plate h are movable. The front end of the mounting side plate h is movably connected to the rear end of a third connecting rod r3, and the front end of the second connecting rod r2 is movably connected to the rear end of a fourth connecting rod r4, and the front part of the third connecting rod r3 Connected to the middle rear portion of the fourth link r4, the front end of the third link r3 is movably connected to the bottom end of a fifth link r5, and the middle portion of the fifth link r5 is movably connected to the bottom end of the foot plate bracket v The middle portion of the foot plate bracket v is movably connected to the middle portion of the fourth link r4, and the top ends of the fourth link r4 and the fifth link r5 are movably connected to the bottom of the footrest w, respectively, and the middle of the two second links r2 The first and second limits extending inward are respectively disposed on the mounting side plate h and above and below the two ends of the first connecting rod r1 through the transition connecting block Positioning bars t1, t2, when the multi-link stretching mechanism is in a contracted state, the pair of limiting posts respectively act in the limiting notches u at the upper and lower edges of the two ends adjacent to the first connecting rod r1; An electric drive mechanism k is connected between the upper and lower rotating rods s, j for controlling the relative rotation of the upper and lower rotating rods s, j And expanding the spacing to drive the action of the stretching mechanism, so that the foot plate bracket v and the footrest w are driven to move forward and upward, and then the backrest member m is tilted backward.

When the backrest member m starts to tilt backward, the positioning pin d1 on the swinging piece d starts to be embedded in the U-shaped groove of the positioning piece x, that is, the locking is formed to prevent the backrest member m from being dumped and the pouring is completed. The back sofa swayed before and after.

As shown in FIG. 5, when the multi-link stretching mechanism is in a contracted state, that is, the sofa is in a sitting state; the distance between the lower rotating lever j and the upper rotating lever s is at a minimum state; since the slider k6 is hinged to the lower rotating lever through the connecting block k5 On the hinged seat of j, the top end of the motor base k2 is hinged on the hinge seat of the upper rotating rod s, and the motor k3 is turned on to drive the screw to rotate. Under the cooperation of the screw and the slider k6, the lower rotating rod j and the upper rotating rod s When the distance between the two is gradually increased, corresponding torques are generated on the upper and lower rotating rods, and the torque generated on the lower rotating rod j is transmitted to the first connecting rod r1 via the transition plate i, the first transmission plate z1 and the second transmission plate z2. The first limit post t1 and the second limit post t2 on the mounting plate h respectively act on the limit notch u at the upper and lower edges of the two ends adjacent to the first link r1, because the first drive plate z1 The movable connection point with the first link r1 is between the contraction first limit column t1 and the second limit column t2, so that the limit action of the pair of limit notches u makes the first link r1 temporarily inoperable; Therefore, at this time, only the upper rotating lever s is rotated and displaced upward and upward; The moving rod s drives the foot board bracket v and the footrest board w to extend forward and upward while lifting the mounting board h from the front end; when the stretching operation of the foot board bracket v and the footrest board w is completed, the motor k3 drives the lower rotating rod j, The distance between the upper rotating rods s continues to increase, and the first limiting column t1 and the second limiting column t2 are respectively separated from the corresponding limiting notches u, so that the first connecting rod r1 is raised to drive the backrest member m backward. Pour until the preset limit angle is reached, ie the entire multi-link stretching mechanism reaches the fully extended state, as shown in Figure 7-9. At this time, the positioning pin d1 on the swinging piece d is embedded in the U-shaped groove of the positioning piece x, that is, the locking is formed, so as to prevent the sofa from swaying back and forth, there are three stress points on the swinging piece d at this time, so The swinging piece d cannot swing freely, so the sofa cannot be shaken back and forth.

As shown in FIGS. 1 to 4, the rotating mechanism includes: an upper casing 1, a lower casing 2, a plurality of balls disposed between the upper and lower casings, and a ball cage 3 for limiting the balls, A brush assembly 4 between the upper and lower casings and in the center of the ball cage 3.

The brush assembly 4 includes an upper annular body 41 and a lower annular body 42. At least one pair of upper and lower symmetrical annular grooves 43 are distributed on adjacent end faces of the upper and lower annular bodies, and a pair of rings on the lower end surface of the upper annular body 41 A plurality of conductive contacts are distributed in the slot, and the conductive contacts in the same annular slot are connected to a single power line 7; a pair of annular slots on the upper end surface of the lower annular body 42 are respectively provided with an external power line 6 The connected annular metal ring is preferably a conductive ring made of a copper ring or a graphite material.

The conductive contacts in the same annular groove are resilient metal sheets which are adapted to contact the annular metal ring below them, preferably elastic copper sheets, and are evenly distributed.

The ball cage 3 is disposed coaxially with the brush assembly 4, and the upper and lower casings are vertically fixed by the center bolt 5.

The brush assembly is used to realize the rotating cooperation of the power source, so that the conductive contacts in the pair of annular grooves on the upper annular body are respectively matched with the activities of the annular metal rings in the pair of annular grooves on the lower annular body, so that the power supply is always maintained. The state of being turned on, thereby avoiding the entanglement of the power supply cable in the case of continuous 360° rotation of the sofa, is convenient for the user to use, and improves the comfort and reliability of the product use.

It is apparent that the above-described embodiments are merely illustrative of the invention and are not intended to limit the embodiments of the invention. Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust all of the implementations. Obvious changes or variations that come within the spirit of the invention are still within the scope of the invention.

Claims

A multi-link stretching mechanism for an electric movable sofa, comprising: a foot plate bracket v, a footrest w, and a backrest member m for driving the foot plate bracket v and the footrest w to be displaced forward and upward, and then driving the backrest member m a stretching mechanism that is tilted backward, an electric drive mechanism k for driving the action of the stretching mechanism;

The stretching mechanism includes: a bottom frame a, and a vertical inner side plate b fixed to the left and right sides of the bottom frame a. The front and rear ends of each inner side plate b are movably connected with front and rear swinging pieces c and d, respectively. An inner limiting rod e is respectively connected between the swinging pieces c and the two rear swinging pieces d, and the bottom ends of the front and rear swinging pieces c and d on the same inner side plate b are respectively hinged to the bottom of an L-shaped bottom rod g On the side, the center of the bottom edge of each L-shaped bottom rod g is movably connected to the bottom end of a first transmission plate z1, and the top end of the first transmission plate z1 is movably connected with the bottom end of a second transmission plate z2; The drive plate z1 is fixedly connected to both ends of the lower rotating rod j through a transition plate i;

The top end of the second transmission plate z2 is movably connected to the middle rear portion of the first link r1, and the rear end of the first link r1 has a waist hole r7, and the waist hole r7 and the bottom side of the L-shaped back plate m The free end is movably connected, the front end of the first link r1 is movably connected to the top end of the vertical end of the L-shaped bottom bar g, and the middle portion of the first link r1 is movably connected with the middle portion of the mounting side plate h for mounting the sofa frame, and is mounted. The rear end of the side plate h is movably connected with the middle upper edge of the back plate m. The middle lower edge of the back plate m is movably connected to the top end of a limiting plate n, and the middle and lower portions of the limiting plate n are provided with a waist-shaped limiting hole n1. An end angle of a triangular connecting block q and a rear end of a curved connecting rod p are simultaneously disposed on both sides of the waist limiting hole n1, and are riveted by a rivet passing through the waist limiting hole n1. The other end of the triangular connecting block q is movably connected with the folded end of the L-shaped backrest member m. The third end of the triangular connecting block q is movably connected with the top end of a sixth connecting rod r6, and the bottom end of the sixth connecting rod r6 is The free end of the bottom side of the bottom edge of the L-shaped bottom rod g is movably connected, and the two sixth connecting rods r6 are fixedly connected at both ends of the outer positioning rod f, the curved connecting rod p The front end of the second link r2 is movably connected to the corner end of the second link r2, and the short end of the second link r2 is movably connected to the bottom front edge of the mounting side plate h, and the front end of the side plate h is mounted The rear end of the third link r3 is movably connected, the front end of the second link r2 is movably connected to the rear end of a fourth link r4, and the middle front portion of the third link r3 and the middle rear portion of the fourth link r4 The movable connection, the front end of the third link r3 is movably connected with the bottom end of a fifth link r5, and the middle of the fifth link r5 is movably connected to the bottom end of a small leg v, the lower middle and the fourth of the small v The middle portion of the connecting rod r4 is movably connected, and the top ends of the fourth connecting rod r4 and the fifth connecting rod r5 are respectively movably connected to the bottom of the big foot board w, and the middle portions of the two second connecting rods r2 pass through the transition connecting block and an upper rotating rod s Fixed connection at both ends;

Provided on the mounting side plate h, above and below the two ends of the first connecting rod r1, first and second limiting posts t1, t2 extending inwardly, respectively, when the multi-link stretching mechanism is in contraction In the state, the pair of limiting posts respectively act on the limiting notch u at the upper and lower edges of the two ends adjacent to the first connecting rod r1;

The electric driving mechanism k is connected between the upper and lower rotating rods s, j for controlling the relative rotation of the upper and lower rotating rods s, j and expanding the spacing to drive the stretching mechanism to drive the foot bracket v and the footrest w are first displaced forward and upward, and then the backrest member m is tilted backward.
The multi-link stretching mechanism according to claim 1, wherein a center edge of a bottom edge of the L-shaped bottom bar g is movably connected to a front end of an inverted V-shaped positioning piece x, and a rear end of the positioning piece x is A free end of a V-shaped transmission block y is movably connected, and the other free end of the transmission block y is movably connected to the middle rear portion of the curved link p, at the lower end of the U-shaped positioning groove x1 at the center bottom of the positioning piece x and at The center of the rear swinging piece d is provided with a positioning pin d1 for cooperating with the U-shaped positioning groove x1;

When the backrest member m starts to tilt backward, the positioning pin d1 on the swinging piece d starts to be embedded in the U-shaped positioning groove x1 of the positioning piece x, that is, the locking is formed to prevent the backrest member m from being dumped. After the neutralization is completed, the sofa will shake back and forth.
The multi-link stretching mechanism according to claim 1 or 2, wherein the electric drive mechanism k is an electric screw mechanism comprising: a motor base k2 whose front side is hinged to a hinge seat at the bottom of the upper rotating lever s The motor base k2 is provided with a motor k3, one end is connected to the screw sleeve k4 on the motor base k2, the screw sleeve k4 is provided with slots on both sides, and the screw sleeve k4 is provided with a screw matched with the motor k3;

A pair of swinging pieces k5 are fixed on the hinge seat of the lower rotating rod j, and a slider k6 which is screwed with the screw is fixed between the swinging pieces k5, and the inner side of the sliding block k6 has two grooves embedded in the screw sleeve k4 a protrusion that cooperates with the screw thread;

a controller is disposed in the motor base k2, and a limit switch connected to the controller is disposed at each end of the screw sleeve k4; when the slider k6 touches the limit switch, the controller controls the Motor k3 stops working.
The multi-link stretching mechanism according to claim 1, wherein the chassis a is disposed on a rotating mechanism, and the rotating mechanism comprises: upper and lower casings 1, 2, and is disposed on the upper and lower casings. a plurality of balls between 1, 2, a ball cage 3 for limiting the balls, a brush assembly 4 disposed between the upper and lower casings 1, 2 and in the center of the ball cage 3;

The brush assembly 4 includes upper and lower annular bodies 41, 42. At least one pair of upper and lower symmetrical annular grooves 43 are distributed on adjacent end faces of the upper and lower annular bodies 41, 42, and one of the lower end faces of the upper annular body 41 A plurality of conductive contacts are distributed in the annular groove, and the conductive contacts in the same annular groove are connected to a single power line; a pair of annular grooves on the upper end surface of the lower annular body 42 are respectively provided with an external power line Connected ring metal rings.
The multi-link stretching mechanism according to claim 4, wherein said rotating mechanism is fixed to a chassis 8.
The multi-link stretching mechanism according to claim 4, wherein the conductive contacts in the same annular groove are elastic metal sheets adapted to be in contact with the underlying annular metal ring and are evenly distributed.
The multi-link stretching mechanism according to claim 6, wherein the ball cage 3 is disposed coaxially with the brush assembly 4, and the upper and lower casings 1, 2 are vertically fixed by the center bolt 5.
The method of operating a multi-link stretching mechanism according to claim 3, comprising:

When the multi-link stretching mechanism is in the contracted state, that is, the sofa is in the sitting state, the motor k3 is turned on to drive the screw to rotate, and the corresponding torque is generated on the upper and lower rotating rods s, j under the cooperation of the screw and the slider k6. And the spacing is gradually increased, the torsion generated on the lower rotating rod j is transmitted to the first connecting rod r1 via the transition plate i, the first transmission plate z1 and the second transmission plate z2, due to the first and second on the mounting plate h The limit columns t1 and t2 respectively act on the corresponding limit notches u, and the movable connection point of the first transmission plate z1 and the first link r1 is between the contraction first and second limit columns t1 and t2, so The first link r1 is temporarily inoperable; at this time, only the upper rotating lever s rotates and moves forward and upward;

The upper rotating rod s drives the foot plate bracket v, the footrest plate w to extend forward and upward, while lifting the mounting plate h from the front end;

When the stretching operation of the foot plate bracket v and the footrest plate w is completed, the distance between the upper and lower rotating rods s and j of the motor k3 is continuously increased, and the first and second limiting columns t1 and t2 are respectively separated from the corresponding limits. The notch u, in turn, raises the first link r1 to drive the backrest member m to tilt backwards until reaching a preset limit angle, that is, the multi-link stretching mechanism reaches a fully extended state, that is, the sofa is lying .
The working method of the multi-link stretching mechanism according to claim 8, characterized in that: when the backrest member m starts to tilt backward, the positioning pin d1 on the swinging piece d starts to be embedded in the U of the positioning piece x In the groove, a lock is formed to prevent the sofa from swaying before and after the backrest member m is dumped and after the dumping is completed.