Seat headrest adjusting mechanism

Abstract

The utility model belongs to the technical field of office furniture, and particularly relates to a seat headrest adjusting mechanism which comprises a headrest frame and an adjusting connecting piece, a height adjusting sliding rail is longitudinally arranged on a headrest portion of the headrest frame, two ends of the height adjusting sliding rail are connected with the headrest frame, and the adjusting connecting piece is arranged on the headrest frame. One end of the adjusting connecting piece is rotationally connected with an angle follow-up sliding block, and the angle follow-up sliding block slides up and down in the range of the pillow cushion part by leaning on the height adjusting sliding rail. The height adjusting sliding rail used for height adjustment is directly arranged at the position of the headrest cushion of the headrest frame, so that the structural strength of the headrest frame is improved, the distance between the height adjusting structure and the headrest frame is shortened, and the adjusting process is more labor-saving and convenient. Meanwhile, the height adjusting sliding rail is arranged on the back face of the pillow cushion in a hidden mode by reasonably applying the space, and the situation that movable parts stretch out of the seat is reduced, so that the structure of the seat is more compact.

Description

Technical Field

[0001] The utility model belongs to the technical field of office furniture, and particularly relates to a seat headrest adjustment mechanism. Background Art

[0002] A headrest is provided on a chair to support the user's head while using the chair, making the user feel more comfortable. To improve the applicability of the chair to people of different heights, the headrest is often adjustable, that is, the distance between the headrest and the chair can be adjusted to achieve the purpose of supporting the heads of users of different heights.

[0003] Patent CN217337933U discloses an adjustable headrest for a seat, which relates to a seat headrest structure comprising a connecting block for fixing to the seat and a headrest body slidably connected to the connecting block. The connecting block is fixed with several positioning devices, which include positioning beads and elastic members, the elastic members being fixed between the positioning beads and the connecting block. The connecting block is provided with a slide groove, and the headrest body has a sliding rod that matches the slide groove. The sliding rod has several positioning grooves that match the positioning beads evenly arranged along the length of the sliding rod, and the positioning beads are placed in the positioning grooves and locked with the positioning grooves. This utility model can quickly and conveniently adjust the headrest to the appropriate height, reduce the complexity of the adjustment operation, increase the adjustment speed, and thus enhance the user experience.

[0004] In the above scheme, although the comprehensive adjustment function of the headrest is realized by the sliding connection between the connecting block and the headrest body and the rotating structure on the connecting block, the sliding connection and the rotating structure are too far away from the headrest body that is directly subjected to the force, and the resulting force arm is too long, which makes the adjustment operation of the adjustable part more laborious, and the sliding rod will also take up more additional space. Utility Model Content

[0005] The purpose of this utility model is to provide a seat headrest adjustment mechanism that can solve the above technical problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The seat headrest adjustment mechanism includes a headrest frame and an adjustment connecting piece. A height adjustment slide rail is longitudinally arranged on the pillow portion of the headrest frame. Both ends of the height adjustment slide rail are connected to the headrest frame. One end of the adjustment connecting piece is rotatably connected to an angle follow-up slider. The angle follow-up slider is horizontally arranged and passes through the slide rail through-hole on the height adjustment slide rail, and the angle follow-up slider slides up and down in the slide rail through-hole. A position locking component is provided between the angle follow-up slider and the height adjustment slide rail, which fixes the angle follow-up slider relative to the slide rail through-hole when the angle follow-up slider is raised or lowered.

[0008] In the seat headrest adjustment mechanism, the height adjustment slide rail includes a slide rail plate whose two ends are respectively connected to the upper and lower sides of the headrest frame and a positioning plate covering the slide rail plate. The angle follower slider slides up and down between the slide rail plate and the positioning plate, and the above-mentioned slide rail through hole is formed between the slide rail plate and the positioning plate.

[0009] In the seat headrest adjustment mechanism, the fixed slide plate is provided with positioning plate support protrusions at both ends close to the headrest frame, and the positioning plate rests on the positioning plate support protrusions, so that the gap between the slide plate and the positioning plate forms a guide rail for the angle follower slider to move.

[0010] In the seat headrest adjustment mechanism, a positioning rib is provided at the connection between the slide plate and the headrest frame, and the positioning rib longitudinally abuts against a positioning groove provided on the positioning plate.

[0011] In the seat headrest adjustment mechanism, hinge columns are symmetrically arranged on both sides of the angle follower slider, one axial end face of the hinge column is rotatably connected to the adjustment connecting piece, and the other axial end face of the hinge column abuts against the side of the height adjustment slide rail.

[0012] In the seat headrest adjustment mechanism, a rotation stop block is radially arranged on the axial end face of the hinge column close to the adjustment connecting piece, and a fan-shaped sliding groove is provided on the connecting surface of the adjustment connecting piece and the hinge column for the rotation stop block to rotate and move.

[0013] In the seat headrest adjustment mechanism, a U-shaped support structure is provided at the end of the adjustment connection member, and two ends of the U-shaped support structure are distributed on both sides of the height adjustment slide rail and are rotationally connected to the angle follower slider.

[0014] In the seat headrest adjustment mechanism, the position locking assembly includes a spring bead and several locking grooves arranged longitudinally, the spring bead is engaged with any one of the locking grooves, and any one of the spring bead and the locking groove is provided on the angle follow-up slider, and the remaining one is provided on the height adjustment slide rail; a guide protrusion is provided on the angle follow-up slider, and the guide protrusion slides in cooperation with the guide groove longitudinally opened in the height adjustment slide rail.

[0015] In the seat headrest adjustment mechanism, the end of the adjustment connector away from the angle follower slider is hinged to the fixed connector through an axially movable angle locking shaft, and the angle locking shaft is circumferentially abutted against the fixed connector and the adjustment connector at the same time in the locked position.

[0016] In the seat headrest adjustment mechanism, the angle locking shaft is axially provided with an elastic member that pushes the angle locking shaft to the locking position, and the angle locking shaft is provided with an unlocking pressing portion extending out of the adjustment connecting member at one end away from the elastic member.

[0017] The advantages of the utility model are:

[0018] The height adjustment rail is located directly on the headrest frame's cushion, improving the structural strength of the headrest frame while reducing the distance between the height adjustment structure and the headrest frame, making adjustment easier and more convenient. Furthermore, by making optimal use of space, the height adjustment rail is hidden behind the cushion, reducing the amount of moving parts protruding from the seat and resulting in a more compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0020] Figure 2 This is a schematic diagram of the headrest frame structure of the present utility model.

[0021] Figure 3 This is a schematic diagram of the positioning plate structure of the utility model.

[0022] Figure 4 This is a structural diagram of the angle follower slider of the utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the adjusting connector of the utility model.

[0024] Figure 6 This is a schematic diagram of the lockable angle adjustment structure of the utility model.

[0025] In the figure, the headrest frame 1, the positioning groove 15, the adjustment connecting part 2, the angle follower slider 21, the hinge column 22, the rotation stop block 23, the fan slide groove 24, the guide protrusion 25, the height adjustment slide rail 3, the slide rail plate 31, the positioning plate 32, the positioning plate support protrusion 33, the positioning rib 34, the guide groove 35, the angle locking shaft 36, the fixed connecting part 4, the position locking assembly 5, the spring bead 51, and the locking groove 52. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the utility model and the accompanying drawings to further describe the technical solution of the utility model, but the utility model is not limited to these embodiments.

[0027] like Figures 1-6 As shown, the seat headrest adjustment mechanism includes a headrest frame 1 and an adjustment connecting member 2. A height adjustment slide rail 3 is longitudinally arranged on the pillow portion of the headrest frame 1. Both ends of the height adjustment slide rail 3 are connected to the headrest frame 1. One end of the adjustment connecting member 2 is rotatably connected to an angle follower slider 21. The angle follower slider 21 is horizontally arranged and passes through the slide rail through hole on the height adjustment slide rail 3, and the angle follower slider 21 slides up and down in the slide rail through hole. A position locking component 5 is provided between the angle follower slider 21 and the height adjustment slide rail 3, which fixes the angle follower slider 21 relative to the slide rail through hole when the angle follower slider 21 is raised or lowered.

[0028] Specifically, the height adjustment rail 3 is located directly on the headrest cushion of the headrest frame 1. This not only improves the structural strength of the headrest frame 1 but also reduces the distance between the height adjustment structure and the headrest frame 1, making the adjustment process more labor-saving and convenient. Furthermore, by making rational use of space, the height adjustment rail 3 is hidden behind the cushion, reducing the amount of moving parts protruding from the seat and making the seat structure more compact.

[0029] In this embodiment, the height adjustment slide rail 3 includes a slide rail plate 31 whose two ends are respectively connected to the upper and lower sides of the headrest frame 1 and a positioning plate 32 covering the slide rail plate 31. The angle follower slider 21 slides up and down between the slide rail plate 31 and the positioning plate 32, and the above-mentioned slide rail through hole is formed between the slide rail plate 31 and the positioning plate 32.

[0030] The height adjustment slide rail 3 is composed of a slide rail plate 31 and a positioning plate 32. The two ends of the slide rail plate 31 are directly fixed to the headrest frame 1. The positioning plate 32 is attached to the slide rail plate 31 by bolt connection with the headrest frame 1. The angle follower slider 21 is arranged between the two plates, so that the angle follower slider 21 can slide up and down along the slide rail plate 31 in the area covered by the pillow pad.

[0031] When the adjustment connector 2 is fixedly connected to the seat, the height adjustment rail 3 can be moved under the support of the angle follower slider 21 to achieve the lifting and lowering adjustment of the seat headrest.

[0032] Preferably, the slide plate 31 is provided with positioning plate support protrusions 33 at both ends close to the headrest frame 1, and the positioning plate 32 rests on the positioning plate support protrusions 33, so that the gap between the slide plate 31 and the positioning plate 32 forms a guide rail for the angle follower slider 21 to move.

[0033] There needs to be a suitable gap between the slide plate 31 and the positioning plate 32 to ensure the movement of the angle follower slider 21. Therefore, positioning plate support protrusions 33 are set at both ends of the slide plate 31 to limit the distance between the two plates and also serve as blocking blocks for the upper and lower limit positions of the angle follower slider 21.

[0034] Preferably, a positioning rib 34 is provided at the connection between the slide rail plate 31 and the headrest frame 1 , and the positioning rib 34 longitudinally abuts against the positioning groove 15 provided on the positioning plate 32 .

[0035] Reinforcing ribs are provided along the inner circle of the headrest frame 1 to increase the structural strength. The reinforcing ribs extend all the way to the slide rail plate 31 to become positioning ribs 34 protruding from the slide rail plate 31, and the positioning plate 32 is provided with a positioning groove 15 corresponding to the positioning rib 34. When the slide rail plate 31 and the positioning plate 32 are assembled, the positioning rib 34 is just embedded in the positioning groove 15 to once again determine the position of the positioning plate 32 on the slide rail plate 31, and the positioning rib 34 and the side wall of the positioning groove 15 are mainly in longitudinal abutment, which can well stabilize the positioning plate 32 from the friction when the angle follower slider 21 moves up and down.

[0036] In this embodiment, hinge columns 22 are symmetrically provided on both sides of the angle follower slider 21 , one axial end face of the hinge column 22 is rotatably connected to the adjustment connecting member 2 , and the other axial end face of the hinge column 22 rests on the side of the height adjustment slide rail 3 .

[0037] The two ends of the angle follower slider 21 exposed from the gap between the slide rail plate 31 and the positioning plate 32 are fixedly connected to the hinge column 22, and the hinge column 22 is rotatably connected to the adjustment connecting member 2 to achieve the change of the pillow support angle of the headrest frame 1.

[0038] At the same time, the axial end faces of the two hinged columns 22 are abutted against the two sides of the height adjustment slide rail 3, and the hinged columns 22 form a track with the width of the height adjustment slide rail 3, so that the angle follower slider 21 will not deflect when moving up and down, ensuring the vertical neutral state of the headrest frame 1.

[0039] Preferably, a rotation stop block 23 is radially provided on the axial end face of the hinge column 22 close to the adjustment connector 2, and a fan-shaped groove 24 for the rotation stop block 23 to rotate and move is provided on the connecting surface of the adjustment connector 2 and the hinge column 22.

[0040] The cooperation between the rotation stop block 23 and the sector sliding groove 24 can limit the upper and lower limits of the angle adjustment of the headrest frame 1, especially the setting of the elevation angle to prevent the headrest frame 1 from flipping to the rear side.

[0041] There is no locking device between the hinge column 22 and the adjustment connector 2 , so the headrest frame 1 can be adaptively adjusted according to the user's neck angle.

[0042] In this embodiment, a U-shaped support structure is provided at the end of the adjustment connecting member 2 , and two ends of the U-shaped support structure are distributed on both sides of the height adjustment slide rail 3 and are rotatably connected to the angle follower slider 21 .

[0043] The two ends of the U-shaped support structure connected to the hinge column 22 can extend into both sides of the height adjustment slide rail 3 without blocking the up and down adjustment, and allow the headrest frame 1 to have more margin when adjusting the angle to prevent the height adjustment slide rail 3 and the adjustment connection member 2 from colliding.

[0044] In this embodiment, a position locking assembly 5 is provided between the angle follower slider 21 and the height adjustment rail 3. This assembly secures the angle follower slider 21 relative to the rail's through-hole when the slider 21 is raised or lowered. The position locking assembly 5 includes a spring bead 51 and a plurality of longitudinally arranged locking grooves 52. The spring bead 51 engages with any one of the locking grooves 52. Either the spring bead 51 or the locking groove 52 is located on the angle follower slider 21, while the remaining one is located on the height adjustment rail 3. The spring bead 51 can be understood as a glass screw. A guide protrusion 25 is provided on the angle follower slider 21, which slides in conjunction with a guide groove 35 longitudinally defined in the height adjustment rail 3.

[0045] As the angle following slider 21 moves up and down, the guide protrusion 25 also slides in the guide groove 35 , further increasing the stability of the movement of the angle following slider 21 .

[0046] Specifically, the spring bead 51 is provided on the angle follower slider 21 and faces the slide plate 31, and the slide plate 31 also has longitudinally arranged locking grooves 52. The spring bead 51 is engaged with any one of the locking grooves 52 to fix the angle follower slider 21 at this height.

[0047] In this embodiment, the end of the adjusting connector 2 away from the angle follower slider 21 is hinged to the fixed connector 4 through an axially movable angle locking shaft 36. The angle locking shaft 36 is circumferentially pressed against both the fixed connector 4 and the adjusting connector 2 in the locked position.

[0048] In addition to height adjustment and angular follow-up adjustment, a lockable angle adjustment mechanism is also provided between the adjustable connector 2 and the fixed connector 4. The adjustable connector 2 and the fixed connector 4 are hingedly connected via an angle locking shaft 36. A portion of the curved surface of the angle locking shaft 36 is provided with concave and convex teeth that engage with the axial holes of the adjustable connector 2 and the fixed connector 4. When the angle locking shaft 36 is moved axially, the angle locking shaft 36 engages with the axial holes of the adjustable connector 2 and the fixed connector 4 simultaneously, preventing the adjustable connector 2 and the fixed connector 4 from swinging relative to each other into a locked state. Conversely, when the angle locking shaft 36 is moved so that it only engages with the adjustable connector 2 or the fixed connector 4, the adjustable connector 2 and the fixed connector 4 can swing relative to each other into an unlocked state.

[0049] Preferably, the angle locking shaft 36 is axially provided with an elastic member for pushing the angle locking shaft 36 to the locking position, and the angle locking shaft 36 is provided with an unlocking pressing portion extending out of the adjustment connector 2 at one end away from the elastic member.

[0050] Angle locking shafts 36 are symmetrically arranged at the shaft holes on both sides of the hinge part. The two angle locking shafts 36 are connected by springs, so that the angle locking shafts 36 are always engaged with the adjusting connector 2 and the fixed connector 4 at the same time and are in a locked state. When unlocking is required, the unlocking pressing parts on both sides are pressed relatively to make the adjusting connector 2 and the fixed connector 4 swing.

[0051] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A seat headrest adjustment mechanism, comprising a headrest frame (1) and an adjustment connector (2), characterized in that: A height adjustment slide rail (3) is longitudinally arranged on the pillow portion of the headrest frame (1), and both ends of the height adjustment slide rail (3) are connected to the headrest frame (1). One end of the adjustment connector (2) is rotatably connected to an angle follower slider (21), and the angle follower slider (21) is horizontally arranged and passes through the slide rail through hole on the height adjustment slide rail (3), and the angle follower slider (21) slides up and down in the slide rail through hole. A position locking component (5) is provided between the angle follower slider (21) and the height adjustment slide rail (3), which fixes the angle follower slider (21) relative to the slide rail through hole when the angle follower slider (21) is raised or lowered.

2. The seat headrest adjustment mechanism according to claim 1, characterized in that: The height adjustment slide rail (3) comprises a slide rail plate (31) whose two ends are respectively connected to the upper and lower sides of the headrest frame (1) and a positioning plate (32) covering the slide rail plate (31); the angle follower slider (21) slides up and down between the slide rail plate (31) and the positioning plate (32); and the above-mentioned slide rail through hole is formed between the slide rail plate (31) and the positioning plate (32).

3. The seat headrest adjustment mechanism according to claim 2, characterized in that: Positioning plate support protrusions (33) are provided at both ends of the slide rail plate (31) close to the headrest frame (1), and the positioning plate (32) abuts against the positioning plate support protrusions (33), so that the gap between the slide rail plate (31) and the positioning plate (32) forms a guide rail for the angle follower slider (21) to move.

4. The seat headrest adjustment mechanism according to claim 2, characterized in that: A positioning rib (34) is provided at the connection between the slide rail plate (31) and the headrest frame (1), and the positioning rib (34) is longitudinally abutted against a positioning groove (15) provided on the positioning plate (32).

5. The seat headrest adjustment mechanism according to claim 1, characterized in that: Hinge columns (22) are symmetrically provided on both sides of the angle follower slider (21), one axial end face of the hinge column (22) is rotatably connected to the adjustment connecting member (2), and the other axial end face of the hinge column (22) abuts against the side of the height adjustment slide rail (3).

6. The seat headrest adjustment mechanism according to claim 5, characterized in that: A rotation stop block (23) is radially provided on the axial end face of the hinge column (22) on the side close to the adjustment connection member (2), and a fan-shaped sliding groove (24) for the rotation stop block (23) to rotate and move is provided on the connection surface between the adjustment connection member (2) and the hinge column (22).

7. The seat headrest adjustment mechanism according to claim 1, characterized in that: A U-shaped support structure is provided at the end of the adjustment connecting member (2), and two ends of the U-shaped support structure are distributed on both sides of the height adjustment slide rail (3) and are rotationally connected to the angle follower slider (21).

8. The seat headrest adjustment mechanism according to claim 1, characterized in that: The position locking assembly (5) includes a spring bead (51) and a plurality of locking grooves (52) arranged longitudinally, the spring bead (51) is engaged with any one of the locking grooves (52), and any one of the spring bead (51) and the locking groove (52) is provided on the angle follower slider (21), and the remaining one is provided on the height adjustment slide rail (3); a guide protrusion (25) is provided on the angle follower slider (21), and the guide protrusion (25) slides in cooperation with a guide groove (35) longitudinally provided in the height adjustment slide rail (3).

9. The seat headrest adjustment mechanism according to claim 1, characterized in that: The end of the adjusting connection member (2) away from the angle follower slider (21) is hinged to the fixed connection member (4) via an axially movable angle locking shaft (36), and the angle locking shaft (36) is circumferentially abutted against the fixed connection member (4) and the adjusting connection member (2) at the same time in the locking position.

10. The seat headrest adjustment mechanism according to claim 9, characterized in that: The angle locking shaft (36) is axially provided with an elastic member for pushing the angle locking shaft (36) to a locking position, and the angle locking shaft (36) is provided with an unlocking pressing portion extending outside the adjusting connecting member (2) at one end away from the elastic member.

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