WO2023207090A1

WO2023207090A1 - Headrest mechanism capable of being adjusted front and back and up and down

Info

Publication number: WO2023207090A1
Application number: PCT/CN2022/135748
Authority: WO
Inventors: 钱觉慧
Original assignee: 安吉瑞宝家具有限公司
Priority date: 2022-04-25
Filing date: 2022-12-01
Publication date: 2023-11-02
Also published as: CN217337932U

Abstract

Disclosed in the present invention is a headrest mechanism capable of being adjusted front and back and up and down, comprising a connecting frame provided at the top end of a chair back frame, and a headrest provided on the connecting frame. The connecting frame comprises a base frame fixed at the top end of the chair back frame, and a flipping frame hinged to the base frame and rotatably adjusted front and back; the headrest comprises a headrest frame and a support frame connected to the top and the bottom of the headrest frame; the support frame is provided with an adjustment slot which extends in the length direction of the support frame and runs through the left side and the right side of the support frame; the flipping frame is provided with a rotating shaft which extends in the left-right direction and is inserted into the adjustment slot; and the rotating shaft can be rotatably adjusted around the central axis of the rotating shaft, and can be slidably adjusted in the length direction of the adjustment slot relative to the support frame. The beneficial effects of the present invention are that: adjustment can be performed in height and front-back dimensions, and the adaptability is improved.

Description

A headrest mechanism that can be adjusted forward and backward in height

Technical field

The present invention relates to a headrest mechanism, in particular to a headrest mechanism that can be adjusted forward and backward in height.

Background technique

Most of the existing office chairs have a headrest mechanism on the top of the chair back frame to provide support for the user's head or neck. In order to expand the user's adaptability, an adjustment function is provided on the headrest mechanism. to adjust the position of the headrest.

For example, the patent application with publication number CN209883542U discloses an office chair with an adjustable headrest height, which includes a chassis structure, a backrest structure, and a headrest structure. The chassis structure is fixedly connected to the lower end of the backrest structure, and the headrest structure is arranged on the backrest structure. The upper end; the headrest structure includes a headrest main body and a height adjustment mechanism; the height adjustment mechanism includes a headrest connecting rod and a headrest connecting part. The upper end of the headrest connecting rod is connected to the headrest main body, and the lower end of the headrest connecting rod is connected to the headrest. The headrest connection part is arranged on the back of the backrest structure; a tooth part is provided on one side of the headrest connecting rod, and the tooth part is distributed along the length direction of the headrest connecting rod; the headrest connection part includes a gear part, and the gear part is connected to the backrest structure. Teeth mesh.

For another example, the patent application with publication number CN213640255U discloses an office chair headrest adjustment device, which includes a headrest, a headrest connector, a headrest and backrest connection sleeve, a backrest moving part, and a backrest tube. The headrest is inserted into the headrest. The upper end of the pillow connector, the headrest connector is connected to the headrest back connection sleeve, the headrest back connection sleeve is sleeved in the middle of the backrest moving piece, the backrest moving piece is sleeved on the backrest tube, and the backrest tube The upper end contains telescopic buckles on the left and right sides, and the top of the backrest tube is connected to the backrest frame of the office chair body through a stop. The office chair headrest adjusting device can adjust the height of the headrest by moving the backrest moving part up and down, and adjust the state of the headrest by changing the tightness of the hexagonal screw on the headrest backrest connection sleeve.

technical problem

The above two headrest mechanisms can only adjust the height of the headrest to cope with users of different heights or users with different needs for support parts (head, neck). However, they cannot adjust the front and rear positions of the headrest and cannot adjust the depth of support. Make adjustments.

Technical solutions

The technical problem to be solved by the present invention is to provide a headrest mechanism that can be adjusted in both height and front and rear dimensions, thereby expanding the adaptability.

The present invention is achieved through the following technical solutions.

A headrest mechanism that can be adjusted forward and backward in height, including a connecting frame arranged on the top of the chair back frame, and a headrest arranged on the connecting frame; the connecting frame includes a base frame fixed on the top of the chair back frame, and a base frame hinged on the base frame. a flip frame that can be adjusted upward and forward and backward; the headrest includes a headrest frame and a support frame connecting the top and bottom of the headrest frame; the support frame has an adjustment groove extending along its length direction and penetrating the left and right sides of the support frame, The flip frame is provided with a rotating shaft extending in the left and right directions and inserted in the adjusting slot; the rotating shaft can be rotated and adjusted around its central axis, and the rotating shaft can be slid and adjusted relative to the support frame along the length direction of the adjusting slot.

As a further improvement of the present invention, the groove wall of the adjustment groove is provided with a plurality of positioning holes arranged at intervals up and down, and the rotating shaft is provided with positioning parts; or the groove wall of the adjustment groove is provided with a plurality of up and down intervals. The positioning member is arranged, and the rotating shaft is provided with a positioning hole; the positioning hole and the positioning member are snap-fitted.

As a further improvement of the present invention, the groove wall of the adjustment groove is provided with a guide structure extending along its length direction, and the rotating shaft is provided with a matching structure; the guide structure and the matching structure are slidingly connected.

As a further improvement of the present invention, the rotating shaft has two contact planes, which are respectively attached to the two groove walls of the adjustment groove; the positioning holes, positioning parts, and matching structures are placed on the contact planes.

As a further improvement of the present invention, the support frame includes a support plate and a cover plate connecting the top and bottom of the headrest frame; the support plate has a groove, and the bottom of the groove forms a groove wall of the adjustment groove; the cover plate It is fixedly connected to the support plate through fasteners, and its surface facing the support plate forms another groove wall of the adjustment groove.

As a further improvement of the present invention, the front part of the flip frame has two bifurcated structures spaced left and right, and the left and right ends of the rotating shaft are respectively rotatably connected to the ends of the two bifurcated structures; the ends of the rotating shaft, The ends of the bifurcated structure respectively have a first rotation adjustment rack and a second rotation adjustment rack arranged annularly around the central axis of the rotation shaft. The first rotation adjustment rack and the second rotation adjustment rack mesh with each other and at least one of them is made of elastic material. .

As a further improvement of the present invention, the end of the rotating shaft is provided with a first limiting groove, and the end of the bifurcated structure is provided with a first limiting structure; or, the end of the rotating shaft is provided with a first limiting structure, A first limiting groove is provided at the end of the bifurcated structure; the first limiting structure is limited in the first limiting groove to limit the rotation range of the rotating shaft around its central axis.

As a further improvement of the present invention, a first base and a second base are respectively provided on the left and right sides of the top of the base frame, and a fixed shaft is connected between the first base and the second base; the flip frame has The casing structure is rotated and sleeved on the fixed shaft; the inner end surface of the first base is provided with a rotation adjustment gear, and the corresponding end surface of the casing structure has an annular arrangement of rotation adjustment tooth slots. The rotation adjustment gear and the rotation adjustment gear are arranged in an annular manner. The adjusting tooth slots mesh with each other and at least one of them is made of elastic material.

As a further improvement of the present invention, a second limiting groove is provided on the inner end surface of the second base, and a second limiting structure is provided on the end surface corresponding to the casing structure; or, the second limiting groove is provided on the inner end surface of the second base. A second limiting structure is provided on the end surface, and a second limiting groove is provided on the corresponding end surface of the casing structure; the second limiting structure is limited in the second limiting groove to limit the front and rear movement of the flip frame. Rotation range.

As a further improvement of the present invention, the rotation adjustment gear is sleeved on the fixed shaft and the two are threadedly matched; the inner end surface of the first base is provided with a receiving groove for partially engaging the rotation adjustment gear; One end of the fixed shaft passes through the second base and is threadedly connected with a screw cap, which is attached to the outer end surface of the second base.

beneficial effects

The present invention can adjust the height position of the headrest through the sliding adjustment of the rotating shaft along the adjustment groove, and can adjust the front and rear position of the headrest through the forward and backward rotational adjustment of the flip frame and the rotational adjustment of the rotating shaft around its central axis, thereby realizing the headrest. Regulatory function in two dimensions.

Description of the drawings

The preferred embodiments of the present invention will be described in detail below through the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

Figure 1 is a side view of the headrest mechanism;

Figure 2 is a cross-sectional view of the headrest and rotating shaft;

Figure 3 is a schematic diagram of the disassembly of the headrest and rotating shaft;

Figure 4 is the second disassembly diagram of the headrest and shaft;

Figure 5 is a schematic structural diagram of the rotating shaft;

Figure 6 is a schematic structural diagram of the flip frame;

Figure 7 is a schematic diagram 2 of the structure of the flip frame;

Figure 8 is a schematic structural diagram of the base frame;

Figure 9 is the second structural diagram of the base frame.

Embodiments of the invention

The present invention will be further described in detail below based on the accompanying drawings and implementation examples.

The terms "upper, lower, left, right, front, back, front, back, top, bottom, etc." mentioned or possibly mentioned in this specification are defined relative to the structure shown in each drawing. The words " "Inside" and "outside" refer to the direction toward or away from the geometric center of a specific component respectively. They are relative concepts, and therefore may change accordingly according to their different locations and different usage states. Therefore, these or other directional terms should not be construed as restrictive terms.

Referring to Figures 1 to 9, a headrest mechanism that can be adjusted forward and backward in height includes a connecting frame 1 and a headrest 2. The connecting frame 1 is arranged on the top of the chair back frame 3, and the headrest 2 is arranged on the connecting frame 1. .

The connecting frame 1 includes a base frame 11 and a flip frame 12. The middle and lower part of the base frame 11 has a claw structure 115. The claw structure 115 is buckled on the top beam of the chair back frame 3, so that the connecting frame 1 Fixed connection with the top of the chair back frame 3. The rear end of the flip frame 12 is hinged to the top of the base frame 11 so that the flip frame 12 can be rotated and adjusted forward and backward. The flip frame 12 vertically extends upward from the rear end, and then bends forward to extend to its front end.

The headrest 2 includes a headrest frame 21 and a support frame 22. A pillow surface (not shown in the figure) is provided in the headrest frame 21. The edge of the pillow surface is fixed on the inner edge of the headrest frame 21 for support. The user’s head and neck. The headrest frame 21 is gradually bent forward from the middle to the left and right sides, so that the two sides of the headrest can wrap around both sides of the head and neck. The support frame 22 has a linear structure, and its top end and bottom end are respectively connected to the middle position of the top and bottom of the headrest frame 21, and avoids two sides of the headrest. The support frame 22 has an adjustment slot 221 extending along its length direction and penetrating the left and right sides of the support frame 22 . The flip frame 12 is provided with a rotating shaft 121 that extends in the left and right direction and is inserted into the adjusting slot 221 . The rotating shaft 121 It can be rotated and adjusted around its central axis, and the rotating shaft 121 can be slid and adjusted relative to the support frame 22 along the length direction of the adjustment groove 221 .

It should be noted that the front and rear rotation adjustment of the flip frame 12, the rotation adjustment of the rotating shaft 121 around its central axis, and the sliding adjustment of the rotating shaft 121 along the adjustment groove 221 are all performed after the lock is unlocked and rotated to a certain extent and moved a certain distance. Relock.

The user can adjust the height of the headrest 2 by sliding the headrest frame 21 up and down so that the rotating shaft 121 slides and adjusts relative to the support frame 22 along the length direction of the adjustment groove 221 . The user adjusts the flip frame 12 by rotating it forward and backward to change the front and rear position of the headrest 2, and then rotates the adjustment shaft 121 around the central axis to adjust the orientation of the headrest 2, thereby adjusting the headrest 2 front and back. Through double adjustment of height and front and rear, it can be suitable for the needs of different heights, different support parts, and different support depths.

The groove wall of the adjustment groove 221 is provided with a plurality of positioning holes 2211 arranged at intervals up and down. The rotating shaft 121 is provided with positioning parts 1211. The positioning holes 2211 and the positioning parts 1211 engage in a snap fit. Furthermore, the positioning member 1211 is configured as a spherical structure formed on the surface of the rotating shaft 121 , and the positioning hole 2211 is configured as a concave spherical surface that matches the shape of the positioning member 1211 . The positioning member 1211 can be configured as an elastic structure. When the rotating shaft 121 slides along the adjustment groove 221, the positioning member 1211 is extruded and compressed and comes out of the current positioning hole 2211. After the adjustment is completed, the positioning member 1211 is inserted into the corresponding positioning hole 2211. An elastic member, such as a return spring, can also be provided between the positioning member 1211 and the rotating shaft 121. When the rotating shaft 121 slides along the adjustment groove 221, the elastic member is compressed so that the positioning member 1211 comes out of the current positioning hole 2211. After the adjustment is completed, the elastic member The elastic force makes the positioning member 1211 snap into the corresponding positioning hole 2211.

In addition, positioning holes can also be provided on the rotating shaft 121, and a plurality of positioning members spaced up and down can be provided on the groove wall of the adjustment groove 221. The effect is the same, but from a cost perspective, the above solution is still the optimal solution.

When the headrest frame 21 is slid up and down for height adjustment, in order to prevent the rotating shaft 121 and the headrest frame 21 from being displaced in the left and right directions, a groove extending along the length direction of the groove wall of the adjustment groove 221 is provided. The guide structure 2212 is provided with a matching structure 1212 on the rotating shaft 121, and the guide structure 2212 and the matching structure 1212 are slidingly connected. More specifically, the guide structure 2212 is formed on the groove wall and extends along the length direction of the adjustment groove 221, and the matching structure 1212 is formed on the rotating shaft 121 and is adapted to the shape of the concave slide. Matching plug structure or insert structure. In addition, the guide structure 2212 can be provided on one of the groove walls, or can be provided on both groove walls at the same time.

Furthermore, the rotating shaft 121 has two contact planes 121a and 121b, which are respectively attached to the two groove walls of the adjusting slot 221, so that the part of the rotating shaft 121 inserted in the adjusting slot 221 has a flat structure. On the one hand, the contact area between the rotating shaft 121 and the two groove walls can be increased, thereby improving the mutual support stability of the two; on the other hand, the width of the adjustment groove 221 can be reduced, making the overall structure of the support frame 22 more compact and saving space. Avoid interference with both sides of the headrest. In addition, the positioning hole 2211 or the positioning member 1211 and the matching structure 1212 are placed on the contact plane.

The support frame 22 includes a support plate 22-1 and a cover plate 22-2, wherein the top and bottom ends of the support plate 22-1 are respectively connected to the top and bottom of the headrest frame 21, and the support plate 22-1 has a concave surface. The bottom of the groove forms a groove wall of the adjustment groove 221. The cover plate 22-2 is fixedly connected to the support plate 22-1 through fasteners, and its surface facing the support plate 22-1 forms an adjustment groove. Another tank wall of 221. The support frame 22 becomes a detachable structure through the support plate 22-1 and the cover plate 22-2, which can facilitate the split packaging after production by the manufacturer, and is also more convenient to assemble. In addition, it is assembled through fasteners. The clamping strength of the adjusting groove 221 on the rotating shaft 121 can be adjusted, and the user can freely adjust the tightness of the sliding support frame 22 accordingly.

Regarding the connection relationship between the flip frame 12 and the rotating shaft 121, the front part of the flip frame 12 has two bifurcated structures 122 spaced left and right. The two bifurcated structures 122 are left and right symmetrical, and the left and right ends of the rotating shaft 121 are respectively connected by rotation. at the ends of the two bifurcated structures 122 . More specifically, the end of the rotating shaft 121 and the end of the bifurcated structure 122 respectively have a first rotation adjustment rack h1 and a second rotation adjustment rack h2 arranged annularly around the central axis of the rotation shaft 121. The rack h1 and the second rotation adjustment rack h2 mesh with each other, and at least one of the first rotation adjustment rack h1 and the second rotation adjustment rack h2 is made of elastic material. When the user holds the headrest frame 21 and rotates it around the central axis of the rotating shaft 121, the first rotational adjustment rack h1 and the second rotational adjustment rack h2 rotate relative to each other, allowing for more precise adjustment.

Furthermore, the end of the rotating shaft 121 is provided with a first limiting groove h3. The first limiting groove h3 is sector-shaped and is surrounded by the first rotation adjustment rack h1. The end of the bifurcated structure 122 is provided with a first limiting structure h4. The first limiting structure h4 is a strip structure and is limited in the first limiting groove h3. When the rotating shaft 121 rotates around its central axis, the first limiting structure h4 is The first limiting structure h4 moves in the first limiting groove h3. When the first limiting structure h4 abuts both sides of the first limiting groove h3, the rotating shaft 121 cannot continue to rotate, thereby limiting the rotation of the rotating shaft 121 around its central axis. The range of rotation prevents the user from over-adjusting the rotation.

Regarding the connection relationship between the base frame 11 and the flip frame 12, a first base 111 and a second base 112 are respectively provided on the left and right sides of the top of the base frame 11. The first base 111 and the second base 112 are formed by the base. The top of the frame 11 is formed by protruding upward. A fixed shaft 113 is connected between the first base 111 and the second base 112. The rear end of the flip frame 12 has a sleeve structure 123, and the sleeve structure 123 is rotatably sleeved on the fixed shaft 113. Among them, the inner end surface of the first base 111 is provided with a rotation adjustment gear j1, and the corresponding end surface of the casing structure 123, that is, the end surface of the first base 111 facing the first base 111 has an annular arrangement of rotation adjustment gear slots j2. The adjustment gear j1 and the rotation adjustment tooth slot j2 mesh with each other, and at least one of them is made of elastic material, so that a more precise rotation adjustment of the flip frame 12 can be achieved.

A second limiting groove j3 is provided on the inner end surface of the second base 112. The second limiting groove j3 is in a fan-shaped shape. A second limiting structure j4 is provided on the corresponding end surface of the casing structure 123. The two limiting structures j4 are in the form of a plug-in structure inserted in the second limiting slot j3 and are limited in the second limiting slot j3. The flip frame 12 is rotated back and forth so that the second limiting structure j4 is against the second limiting slot j3. When the two sides of the limiting groove j3 are located, the flip frame 12 cannot continue to rotate, thereby limiting the forward and backward rotation range of the flip frame 12.

In order to facilitate the assembly and disassembly of the flip frame 12 and the base frame 11, the rotation adjustment gear j1 is sleeved on the fixed shaft 113 and the two are threadedly matched. The inner end surface of the first base 111 is provided with a partially embedded Rotate the accommodation groove 1111 of the adjustment gear j1. One end of the fixed shaft 113 passes through the second base 112 and is threadedly connected to the screw cap 114. The screw cap 114 fits on the outer end surface of the second base 112.

Finally, it should be noted that the above implementation examples are only used to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing implementation examples, those of ordinary skill in the art should understand that it can still be used Modifications are made to the technical solutions recorded in the foregoing embodiments, or equivalent substitutions are made to some of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions in each embodiment of the present invention.

Claims

A headrest mechanism that can be adjusted forward and backward in height, including a connecting frame arranged on the top of the chair back frame, and a headrest arranged on the connecting frame; characterized in that the connecting frame includes a base frame fixed on the top of the chair back frame, A flip frame that is hinged on the base frame and can be rotated forward and backward; the headrest includes a headrest frame and a support frame connecting the top and bottom of the headrest frame; the support frame has a structure that extends along its length and runs through the left and right sides of the support frame The turning frame is provided with a rotating shaft extending in the left and right directions and inserted in the adjusting slot; the rotating shaft can be rotated and adjusted around its central axis, and the rotating shaft can be slid and adjusted relative to the support frame along the length direction of the adjusting slot.
The headrest mechanism that can be adjusted forward and backward according to claim 1, wherein the groove wall of the adjustment groove is provided with a plurality of positioning holes spaced up and down, and the rotating shaft is provided with positioning parts; or, The groove wall of the adjustment groove is provided with a plurality of positioning parts arranged at intervals up and down, and the rotating shaft is provided with positioning holes; the positioning holes and the positioning parts fit in a snap fit.
The headrest mechanism that can be adjusted forward and backward according to claim 2, wherein the groove wall of the adjustment groove is provided with a guide structure extending along its length direction, and the rotating shaft is provided with a matching structure; The guide structure and the matching structure are slidingly connected.
The headrest mechanism that can be adjusted forward and backward according to claim 3, characterized in that the rotating shaft has two contact planes, which are respectively attached to the two groove walls of the adjustment groove; the positioning hole or positioning member , the matching structure is placed on the contact plane.
The headrest mechanism according to claim 4, wherein the support frame includes a support plate and a cover plate connecting the top and bottom of the headrest frame; the support plate has a groove, and the groove of the groove is The bottom forms one groove wall of the adjustment groove; the cover plate is fixedly connected to the support plate through fasteners, and its surface facing the support plate forms another groove wall of the adjustment groove.
The headrest mechanism that can be adjusted forward and backward according to claim 1, characterized in that the front part of the flip frame has two bifurcated structures separated to the left and right, and the left and right ends of the rotating shaft are respectively rotatably connected to the two bifurcated structures. The end of the fork structure; the end of the rotating shaft and the end of the bifurcated structure respectively have a first rotation adjustment rack and a second rotation adjustment rack arranged annularly around the central axis of the rotation shaft, and the first rotation adjustment rack and the third rotation adjustment rack The two rotating adjustment racks mesh with each other and at least one of them is made of elastic material.
The headrest mechanism that can be adjusted forward and backward according to claim 6, wherein the end of the rotating shaft is provided with a first limiting groove, and the end of the bifurcated structure is provided with a first limiting structure; or, The end of the rotating shaft has a first limiting structure, and the end of the bifurcated structure is provided with a first limiting groove; the first limiting structure is limited in the first limiting groove to limit the rotation of the rotating shaft. The rotation range of the axis.
The headrest mechanism according to claim 1, wherein the first base and the second base are respectively provided on the left and right sides of the top of the base frame. A fixed shaft is connected between the seats; the flip frame has a sleeve structure that is rotated and sleeved on the fixed shaft; a rotation adjustment gear is provided on the inner end surface of the first base, and the corresponding end surface of the sleeve structure has a There are annularly arranged rotation adjustment tooth slots, the rotation adjustment gear and the rotation adjustment gear slot mesh with each other, and at least one of them is made of elastic material.
The headrest mechanism according to claim 8, wherein the inner end surface of the second base is provided with a second limiting groove, and the corresponding end surface of the sleeve structure is provided with a second limiting groove. a limiting structure; or, a second limiting structure is provided on the end surface of the second base, and a second limiting groove is provided on the end surface corresponding to the casing structure; the second limiting structure is limited to the first The second limit slot is used to limit the forward and backward rotation range of the flip frame.
The headrest mechanism that can be adjusted forward and backward according to claim 9, characterized in that the rotation adjustment gear is sleeved on the fixed shaft and the two are threadedly matched; the inner end surface of the first base is provided with a partial The accommodating groove of the rotation adjustment gear is engaged; one end of the fixed shaft passes through the second base and is threadedly connected with a screw cap, and the screw cap fits on the outer end surface of the second base.