CN217565435U - Headrest angle adjusting mechanism and sofa headrest - Google Patents

Abstract

The utility model discloses a headrest angle adjusting mechanism and sofa headrest, including upset connecting piece, lifting unit, interlock subassembly and elastic component, lifting unit includes moving part and fixed subassembly, and the upset connecting piece is used for being connected with the moving part rotation, and the both ends of elastic component are connected upset connecting piece and moving part respectively; one end of the fixed component is provided with a limiting deflection piece, a limiting surface matched with the limiting deflection piece is arranged on the overturning connecting piece, the moving piece is used for driving the overturning connecting piece to move relative to the fixed component, and the limiting deflection piece is used for enabling the overturning connecting piece to deflect and adjust; the linkage assembly comprises a lifting rod and a fixed rod, the fixed rod is used for being connected with the fixed assembly, the lifting rod is used for being connected with the moving part, and the middle of the lifting rod is used for being connected with the sliding block of the driving source. Adopt the utility model has the advantages of improve the drive stability, reduce the volume and reduce back thickness.

Description

Headrest angle adjusting mechanism and sofa headrest

Technical Field

The utility model relates to a sofa headrest technical field especially relates to a headrest angle adjustment mechanism and sofa headrest.

Background

The smart home appliances are increasingly popularized in life as part of smart home appliances, and a plurality of smart furniture are provided with an angle automatic adjusting mechanism. For example, the functional sofa has the functions of adjusting the posture and changing the form, and can adjust the angles and the heights of different parts such as legs, a backrest, a headrest, a waist and the like so as to adapt to different people and different sitting postures, find the most comfortable angle of the body and relax the body.

The prior sofa with the backrest angle adjusting function can not adjust the headrest part alone, or the adjustment of the headrest by manual adjustment is not convenient enough. Some backrest frames can meet the requirement of convenient adjustment, but have complex adjustment structure, poor driving stability and larger volume, and need thicker backrest frames for installation, thereby influencing the attractiveness of the backrest.

Disclosure of Invention

The utility model aims to solve the technical problem that the angle adjusting mechanism of the existing sofa headrest has complicated structure and poor driving stability, and has large volume, increases the thickness of the backrest, and influences the problem of the attractive appearance of the backrest.

In order to solve the technical problems, the present application provides a headrest angle adjusting mechanism, which includes a flip connecting member, a lifting assembly, a linkage assembly and an elastic member, wherein the lifting assembly includes a moving member and a fixing assembly, the flip connecting member is used for being rotatably connected with the moving member, and two ends of the elastic member are respectively connected with the flip connecting member and the moving member;

the fixed component is provided with a limiting deflection piece, the overturning connecting piece is provided with a limiting surface matched with the limiting deflection piece, the moving piece is used for driving the overturning connecting piece to move relative to the fixed component, and after the limiting surface is contacted with the limiting deflection piece, the moving piece continues to move so that the overturning connecting piece rotates relative to the moving piece under the resistance of the limiting deflection piece;

the linkage assembly comprises a lifting rod and a fixing rod, the fixing rod is used for being connected with the fixing assembly, the lifting rod is used for being connected with the moving part, and the middle of the lifting rod is used for being connected with a sliding block of the driving source.

Further, the driving source comprises a driving motor, a driving guide rail and a sliding block, and the driving motor is used for driving the sliding block to drive the lifting rod to slide along the driving guide rail.

Furthermore, a slider connecting piece is arranged on the lifting rod and used for connecting the lifting rod and the slider.

Further, the turnover connecting piece comprises a limiting surface and an adjusting plate connecting surface, wherein the limiting surface is perpendicular to the adjusting plate connecting surface, and the adjusting plate connecting surface is used for being connected with the headrest plate.

Furthermore, the limiting surface comprises a guide inclined surface, and the guide inclined surface is connected with the limiting deflection piece in a sliding mode in the rotating process of the turnover connecting piece.

Preferably, the tail end of the guide inclined plane is provided with an arc contact surface, and the arc contact surface is used for contacting and moving with the limiting deflection piece to enable the turnover connecting piece to rotate at a constant speed.

Furthermore, the limiting deflection piece is a limiting pin, and a rotating bushing is sleeved on the limiting pin.

Further, fixed subassembly includes fixed part and installation department, the fixed part with installation department integrated into one piece, fixed connection or components of a whole that can function independently set up, spacing deflection piece sets up on the installation department.

Furthermore, one end of the movable part connected with the turnover connecting part is provided with a limiting part, and the limiting part is used for matching with the bottom surface of the turnover connecting part to limit the rotation angle of the turnover connecting part.

Preferably, a guide rail groove body is arranged on the fixed component, a sliding groove body matched with the guide rail groove body is arranged on the movable component, and the sliding groove body is in sliding connection with the guide rail groove body.

Furthermore, a lifting connecting piece is arranged on the moving piece, one end of the lifting connecting piece is hinged to the overturning connecting piece, and the other end of the lifting connecting piece is connected with the lifting rod.

Preferably, the movable member is provided with a guide chute, the fixed assembly is provided with at least two guide members matched with the guide chute, and the guide chute is connected with the guide members in a sliding manner.

Furthermore, the movable piece is provided with a lifting connecting part, and the lifting connecting part is used for being connected with the lifting rod.

The application still provides a sofa headrest, including headrest board, back frame and angle adjustment mechanism, the headrest board with the upset connecting piece is connected in order to adjust the headrest angle, angle adjustment mechanism passes through fixed subassembly sets up back frame is inboard, lifting unit drives the biggest lift distance of headrest board is 100mm-170mm, simultaneously the biggest angle of adjustment of headrest board is 40-70.

Furthermore, the backrest frame comprises two opposite installation side plates, and the width of each installation side plate is 50-70 mm.

Implement the embodiment of the utility model provides a, following beneficial effect has:

the utility model discloses a lifter drives both ends guide rail or direction spout structure in step and realizes the slip lift, and lifting unit simple structure and both sides lifting unit's synchronous stability is good, and lifting unit realizes the angle modulation of upset connecting piece with the cooperation of spacing deflection piece, adjusts the structure simple and easy, greatly reduced occupation space and cost, is favorable to reducing back frame thickness, improves the outward appearance pleasing to the eye degree of sofa back.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of an angle adjusting mechanism according to embodiment 1;

FIG. 2 is an isometric view of a partial structure of the angle adjustment mechanism of embodiment 1;

FIG. 3 is another directional view of the angle adjustment mechanism of FIG. 1;

FIG. 4 is a schematic view showing the structure of the flip connector according to embodiment 1;

FIG. 5 is a schematic structural view of the lifting assembly of embodiment 1;

FIG. 6 is a schematic structural view of the headrest for sofa according to embodiment 1;

FIG. 7 is a side view of the sofa headrest according to embodiment 1;

fig. 8 is a schematic structural view of the sofa headrest according to embodiment 2.

Wherein the reference numbers in the figures correspond to: 1-turnover connecting piece, 11-limiting surface, 12-adjusting plate connecting surface, 111-guiding inclined surface, 2-lifting assembly, 21-moving piece, 211-sliding groove body, 212-lifting connecting piece, 213-guiding sliding groove, 214-lifting connecting part, 22-fixing assembly, 22 a-fixing part, 22 b-mounting part, 221-limiting deflection piece, 2211-rotating bush, 222-guide rail groove body, 223-guiding piece, 23-limiting piece, 3-lifting rod, 31-sliding block connecting piece, 4-fixing rod, 5-linkage assembly, 50-driving source, 51-driving motor, 52-driving guide rail, 53-sliding block, 6-elastic piece, 7-headrest plate, 8-backrest frame and 81-mounting side plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In addition, in the present invention, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" and the like are to be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The utility model provides a headrest angle adjustment mechanism can be used to the angular adjustment of partial structure for the body among the common furniture, for example, can install on the sofa body for the angle of the relative sofa body in positions such as the shank of adjustment sofa, back, headrest or waist. In the embodiment of the application, the turnover adjusting mechanism is arranged on the sofa backrest frame and is used for adjusting the angle of the sofa headrest.

Example 1

As shown in fig. 1-5, the present embodiment 1 provides a headrest angle adjusting mechanism, which includes a flip connecting member 1, a lifting assembly 2, a linking assembly 5 and an elastic member 6, wherein the lifting assembly 2 includes a movable member 21 and a fixed member 22, the flip connecting member 1 is used for being rotatably connected to the movable member 21, and two ends of the elastic member 6 are respectively connected to the flip connecting member 1 and the movable member 21;

specifically, the fixed component 22 is provided with a limiting deflection piece 221, the overturning connecting piece 1 is provided with a limiting surface 11 matched with the limiting deflection piece 221, the moving piece 21 is used for driving the overturning connecting piece 1 to move relative to the fixed component 22, and after the limiting surface 11 is contacted with the limiting deflection piece 221, the moving piece 21 continues to move so that the overturning connecting piece 1 rotates relative to the moving piece 21 under the resistance of the limiting deflection piece 221;

specifically, the linkage assembly 5 includes a lifting rod 3 and a fixing rod 4, the lifting rod 3 is disposed below the fixing rod 4, the fixing rod 4 is used for being connected with the fixing assembly 22, the lifting rod 3 is used for being connected with the movable member 21, and the middle portion of the lifting rod 3 is used for being connected with the linear output end of the driving source 50.

Specifically, the driving source 50 includes a driving motor 51, a driving rail 52 and a slider 53, and the driving motor 51 is used for driving the slider 53 to drive the lifting rod 3 to slide along the driving rail 52. In other possible embodiments, the driving source 50 may also be a linear push rod motor, a driving cylinder, a hydraulic cylinder, or other linear driving structure capable of driving the lifting rod to move up and down. The fixed end of the driving structure can be connected with the fixed rod 4 or the top frame of the backrest frame, and the linear output end of the driving structure is connected with the lifting rod 3.

Specifically, the lifting rod 3 is provided with a slider connecting piece 31, and the slider connecting piece 31 is used for connecting the lifting rod 3 and the slider 53. In some embodiments, the slider may be hinged to a slider connector 31, and the slider connector 31 is fixedly connected to the lifting rod 3. In other embodiments, the sliding block can be fixedly connected with the quick connecting piece, the left and right synchronization stability of the lifting rod is better under the condition, and the linear movement direction of the driving motor driving the sliding block is consistent with the movement direction of the sliding rail.

Specifically, the turnover connecting piece comprises a regulating plate connecting surface 12 and a limiting surface 11, wherein the limiting surface 11 is perpendicular to the regulating plate connecting surface 12, and the regulating plate connecting surface 12 is used for being connected with a headrest plate. In the present embodiment, the adjusting plate connecting surface 12 and the limiting surface 11 are integrally formed by bending. The limiting surface 11 comprises a guiding inclined surface 111, and during the rotation process of the turnover connection piece 1, the guiding inclined surface 111 is connected with the limiting deflection piece 221 in a sliding manner.

Preferably, the tail end of the guide inclined plane can be provided with an arc contact surface, when the overturning connecting piece rotates, the limiting deflection piece is in contact with the arc contact surface, so that the rotating speed of the overturning connecting piece can be prevented from suddenly changing, the overturning connecting piece can keep rotating at a constant speed, and the adjusting process is more stable.

Specifically, still include elastic component 6, elastic component 6 one end is connected with upset connecting piece 1, and the other end is connected with the moving part through a connecting piece. In this embodiment, the elastic member 6 is a spring member, and because of the elasticity of the spring, a certain elastic restoring force is maintained between the flip connector 1 and the movable member. When the driving turnover connecting piece 1 rotates and retracts, because of the elastic force of the elastic piece 6, the recovery force of the turnover connecting piece is smaller than the recovery force generated by the linkage component driving the lifting rod and the moving piece under the driving of the driving source, therefore, in the process of recovering the turnover connecting piece driving the headrest plate, the clamping force of the headrest plate clamping the hand or the object can be greatly reduced, and because the elastic force of the elastic piece can easily pull the headrest plate open, the gap between the headrest plate and the backrest frame is enlarged, the clamped object is taken out, and the anti-clamping effect is achieved.

Specifically, the limit deflection member 221 is a limit pin on which a rotating bushing 2211 is sleeved. In this embodiment, the fixing assembly 22 includes a fixing portion 22a and a mounting portion 22b, the limit deflecting member 221 is disposed on the mounting portion 22b, and the fixing portion 22a and the mounting portion 22b are fixedly connected and fixedly connected to the backrest frame by a fastener such as a bolt, a screw, or a rivet. Specifically, when the movable element 21 drives the roll-over connection member 1 to move along the fixing element 22 until the roll-over connection member 1 abuts against the limit deflection member 221, the rotating bushing 2211 is in rolling connection with the guiding inclined plane 111. In some embodiments, the fixing portion 22a may be provided separately from the mounting portion 22b and fixed to the backrest frame, respectively. In other embodiments, the fixing portion 22a may be integrally formed with the mounting portion 22 b.

Specifically, one end of the movable member 21 connected to the flip connection member 1 is provided with a limiting member 23, and the limiting member 23 is used for cooperating with the bottom surface of the flip connection member 1 to limit the rotation angle of the flip connection member 1. Specifically, the bottom surface of the turnover connecting piece 1 is provided with two contact planes which are matched with the limiting piece and can be opened and closed at different heights. The limiting part 23 can be limiting devices such as limiting rivets, limiting pins and limiting blocks, and the rotating angle of the turnover connecting piece 1 is limited so that the turnover connecting piece can be prevented from being normally retracted and the comfort level of the turnover connecting piece is reduced due to the influence of excessive adjustment.

Specifically, in the present embodiment, the fixed component 22 is provided with a guide rail groove 222, the movable component 21 is provided with a sliding groove 211 matched with the guide rail groove 222, and the sliding groove 211 and the guide rail groove 222 are matched to slide so that the movable component 21 slides relative to the fixed component 22. In this embodiment, the rail groove body 222 slides in a sleeved manner with the sliding groove body 211, the sliding groove body 22 is further provided with a rolling element and an embedded frame for enabling the sliding groove body 211 to slide smoothly, the rolling elements are uniformly distributed on the embedded frame, a sliding surface of the sliding groove body 211 contacts with the rolling element, friction force in a power transmission process is reduced through a rolling manner, power transmission efficiency is improved, and the guide rail is high in guide precision, portable and stable in movement and good in wear resistance. In practical applications, the movable member 21 moves up and down relative to the fixed member 22 and includes, but is not limited to, the movable member moving up and down relative to the fixed member by sliding through a sliding slot, a threaded rotating structure, a sliding sleeve, a linear push rod, or a sliding rail.

Specifically, in the present embodiment, the movable member 21 is provided with a lifting connection member 212, one end of the lifting connection member 212 is hinged to the turnover connection member 1, and the other end of the lifting connection member 212 is used for being connected to the lifting rod 3. Specifically, the lifting connecting piece 212 is fixed on the movable piece 21 through fasteners such as screws, bolts, rivets and the like or welding modes, one end of the lifting connecting piece 212 is rotatably connected with the turnover connecting piece 1 through a rotatable hinge piece, the other end of the lifting connecting piece 212 is provided with a bending connecting part, the bending connecting part is connected with the lifting rod 3, the lifting rod 3 is arranged between the two lifting connecting pieces 212, and the two movable pieces 21 on the two sides are synchronously driven to move.

The present embodiment further provides a sofa headrest, as shown in fig. 6 to 7, comprising a headrest plate 7, a backrest frame 8 and an angle adjusting mechanism, wherein the headrest plate 7 is used for connecting with the turning connecting member 1 to adjust the angle of the headrest, and the turning adjusting mechanism is disposed inside the backrest frame 8 through a fixing component 22. Specifically, the lifting assembly 2 drives the headrest plate 7 to move up and down by a maximum distance of 100mm-170mm, and the maximum adjustment angle of the headrest plate 7 is 40-70 degrees. The driving source 50 drives the lifting rod 3 to move, so as to drive the lifting assembly 2 to move up and down and turn over the connecting piece 1. Preferably, the maximum sliding distance of the movable member 21 is 130mm to 170mm. In this embodiment, the maximum lifting distance of the lifting assembly 2 driving the headrest plate 7 may be 100mm, 110mm, 120mm, 130mm, 150mm, 160mm or 170mm, and the maximum adjustment angle of the flipping connecting member 1 driving the headrest plate 7 may be 40 °, 45 °,50 °, 55 °, 60 ° or 70 °. The sofa backrest with the headrest angle adjusting mechanism can adjust the headrest angle and can realize the height conversion of the sofa backrest.

In some embodiments, the headrest plate 7 may include first and second hinged adjustment plates, the first adjustment plate being rotatable relative to the second adjustment plate. Specifically, in practical application, first regulating plate is connected with the upset connecting piece, and the second regulating plate can rotate for first regulating plate, and the second regulating plate makes user's head can lean back slightly for keep suitable curvature between head and the neck, relax the cervical vertebra. A limiting component for limiting the rotation angle of the first adjusting plate can be arranged between the first adjusting plate and the second adjusting plate so as to limit the maximum rotation angle of the second adjusting plate.

The backrest frame 8 of the present embodiment includes two opposite mounting side plates 81, and the width of the mounting side plates 81 is 50mm-70mm, and preferably, the maximum width of the mounting side plates may be 50mm, 55mm, 60mm, 65mm, 68mm or 70mm. Compare in traditional sofa back, the curb plate width is narrower in this application installation, and the thickness of sofa back frame is thinner, is favorable to reducing the back volume, improves the pleasing to the eye degree of sofa outward appearance, realizes ultra-thin type sofa design. This application angle adjustment mechanism realizes the angle modulation of headrest board through the spacing deflection piece of the lifting unit cooperation that can slide, and lifting unit is small, occupation space is little for this embodiment back frame width size reduces, and the size of back thickness direction reduces promptly, improves the pleasing to the eye degree of sofa back outward appearance.

In this embodiment, when adjusting the angle of the sofa headrest, the driving motor 51 drives the sliding block 53 to slide along the driving guide rail 52, and the driving lifting rod 3 drives the two-side moving members 21 to slide upward relative to the fixed component 22, so as to drive the turning connecting member 1 and the headrest plate 7 to move upward, and after the limiting surface 11 of the turning connecting member 1 contacts with the limiting deflection member 221 arranged at one end of the fixed component 22, based on the force of the turning connecting member 1 continuing to move upward, the rotating bushing 2211 of the limiting deflection member 221 rolls along the limiting surface 11, and blocks to make the turning connecting member 1 drive the headrest plate to deflect and adjust to one side of the backrest frame. Be provided with elastic component 6 between upset connecting piece 1 and the lift connecting piece 212, keep the elasticity restoring force between upset connecting piece and the moving part through the elastic component, make the upset connecting piece withdraw along with the moving part smoothly, and even under the circumstances that the headrest board presss from both sides the hand, rely on the elastic component to enlarge the movable scope of headrest board, even make the headrest board pull open to play the effect of preventing pressing from both sides the hand.

Example 2

As shown in fig. 8, the lifting assembly 2 of embodiment 2 is different from embodiment 1, and the lifting assembly 2 of embodiment 2 is different from embodiment 1 in that a fixing portion 22a and an installation portion 22b are integrally formed, a guide sliding groove 213 is provided on a movable member 21, at least two guide members 223 matched with the guide sliding groove 213 are provided on the fixing assembly 22, and the guide sliding groove 213 is slidably connected with the guide members 223. Specifically, at least two guide members 223 are used to slide the guide runner 213 along a straight line defined thereby. In embodiment 2, the guide member 223 is a sliding pin, at least two sliding pins are fixed on the fixed component 22, the sliding pin is installed in the guide sliding groove 213, and the guide sliding groove 213 is slidably connected with the sliding pin so that the movable member 21 can slide relative to the fixed component 22.

Specifically, in the present embodiment, the movable member 21 is directly hinged to one end of the flipping connecting member 1, the other end of the flipping connecting member 1 is connected to the headrest plate 7, and the movable member 21 drives the flipping connecting member 1 and the headrest plate 7 to slide along the fixing member 22. The movable member 21 is provided with a lifting connection portion 214, and the lifting connection portion 214 is used for being connected with the lifting rod 3. Specifically, the middle part of the movable member 21 is provided with a lifting connection portion 214 bent inward relative to the movable member 21, the lifting rod 3 is fastened and connected to the lifting connection portion 214 by a fastening member such as a bolt or a screw, and the movable member 21 is driven to move by the movement of the lifting rod 3.

In this embodiment, driving motor 51 drives slider 53 and drives lifter 3 to move along drive rail 52, and slider 53 can be connected with lifter 3 fixed connection, also can adopt pivot or the mode of bolt connection to be connected with lifter 3, simple to operate, and the slider is good along the gliding driving motor drive stability of slide rail for the regulation of headrest board is more smooth-going.

This application upset adjustment mechanism realizes the rotation of upset connecting piece and the angular adjustment of sofa headrest through slip lifting unit and spacing deflection piece cooperation, compares in the headrest structure that adopts complicated link mechanism to carry out the angle modulation, and this application simple structure, motion are lightly steady, manufacturing and installation steps reduce, have greatly reduced space and cost demand. The adjusting mechanism is small in size, can be applied to angle and headrest adjustment of the thin sofa backrest, and improves the appearance attractiveness of the sofa backrest.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims (15)

1. The headrest angle adjusting mechanism is characterized by comprising a turnover connecting piece (1), a lifting assembly (2), a linkage assembly (5) and an elastic piece (6), wherein the lifting assembly (2) comprises a moving piece (21) and a fixed assembly (22), the turnover connecting piece (1) is used for being rotatably connected with the moving piece (21), and two ends of the elastic piece (6) are respectively connected with the turnover connecting piece (1) and the moving piece (21);

the fixed component (22) is provided with a limiting deflection piece (221), the overturning connecting piece (1) is provided with a limiting surface (11) matched with the limiting deflection piece (221), the moving piece (21) is used for driving the overturning connecting piece (1) to move relative to the fixed component (22), and when the limiting surface (11) is contacted with the limiting deflection piece (221), the moving piece (21) continues to move to enable the overturning connecting piece (1) to rotate relative to the moving piece (21) under the resistance of the limiting deflection piece (221);

the linkage assembly (5) comprises a lifting rod (3), the lifting rod (3) is used for being connected with the movable piece (21), and the middle of the lifting rod (3) is used for being connected with a linear output end of the driving source (50).

2. The headrest angle adjustment mechanism according to claim 1, wherein the drive source (50) includes a drive motor (51), a drive rail (52), and a slider (53), the drive motor (51) being configured to drive the slider (53) to slide the lifter bar (3) along the drive rail (52).

3. A headrest angle adjustment mechanism according to claim 1, characterized in that a slider link (31) is provided on the lifter bar (3), the slider link (31) being for connecting the lifter bar (3) and the slider (53).

4. A headrest angle adjustment mechanism according to claim 1, characterized in that said flip connection member (1) comprises a limiting surface (11) and an adjustment plate connection surface (12), said limiting surface (11) being perpendicular to said adjustment plate connection surface (12), said adjustment plate connection surface (12) being adapted for connection with a headrest plate.

5. The headrest angle adjusting mechanism as claimed in claim 4, wherein said stopper surface (11) includes a guide slope (111), said guide slope (111) being slidably coupled with said stopper deflector (221) during rotation of said tumble link (1).

6. The headrest angle adjusting mechanism according to claim 5, characterized in that the tail end of the guiding inclined surface (111) is provided with an arc-shaped contact surface, and the arc-shaped contact surface is used for contacting with the limit deflection piece (221) to move so as to enable the overturning connecting piece (1) to rotate at a constant speed.

7. The headrest angle adjusting mechanism as claimed in claim 6, wherein the limit deflector (221) is a limit pin on which a rotation bushing (2211) is fitted.

8. The headrest angle adjustment mechanism according to claim 7, wherein the fixing member (22) includes a fixing portion (22 a) and a mounting portion (22 b), the fixing portion (22 a) and the mounting portion (22 b) are integrally formed, fixedly connected, or separately provided, and the position restricting deflection member (221) is provided on the mounting portion (22 b).

9. The headrest angle adjusting mechanism according to claim 1, wherein a limiting member (23) is disposed at one end of the movable member (21) connected to the flip connecting member (1), and the limiting member (23) is configured to cooperate with a bottom surface of the flip connecting member (1) to limit a rotation angle of the flip connecting member (1).

10. The headrest angle adjusting mechanism according to claim 1, wherein a guide rail groove body (222) is arranged on the fixing component (22), a sliding groove body (211) matched with the guide rail groove body (222) is arranged on the movable member (21), and the sliding groove body (211) is connected with the guide rail groove body (222) in a sliding manner.

11. The headrest angle adjusting mechanism according to claim 10, wherein a lifting link member (212) is provided on the movable member (21), one end of the lifting link member (212) is hinged to the roll-over link member (1), and the other end of the lifting link member (212) is connected to the lifting rod (3).

12. The headrest angle adjustment mechanism according to claim 1, wherein a guide sliding groove (213) is formed on the movable member (21), at least two guide members (223) engaged with the guide sliding groove (213) are formed on the fixed member (22), and the guide sliding groove (213) is slidably coupled to the guide members (223).

13. The headrest angle adjustment mechanism according to claim 12, wherein a lifting connection portion (214) is provided on the movable member (21), the lifting connection portion (214) being adapted to be connected to the lifting rod (3).

14. A sofa headrest, characterized in that it comprises a headrest plate (7), a backrest frame (8) and an angle adjusting mechanism according to claims 1-13, said headrest plate (7) is connected with said turning connector (1) to adjust the headrest angle, said angle adjusting mechanism is arranged inside said backrest frame (8) by means of a fixing assembly (22), the lifting assembly (2) drives the maximum lifting distance of said headrest plate (7) to be 100-170 mm, and the maximum adjustment angle of said headrest plate (7) is 40-70 °.

15. The sofa headrest according to claim 14, wherein the backrest frame (8) comprises two oppositely arranged side mounting plates (81), the side mounting plates (81) having a width of 50mm-70mm.

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