Headrest height adjusting structure and child safety seat

Abstract

The utility model relates to the field of automobile safety supplies, and discloses a headrest height adjusting structure and a child safety seat, the headrest height adjusting structure comprises a seat back and a headrest assembly which are mutually connected in an up-down moving mode, the headrest assembly comprises a tooth pressing plate and a shaft sleeve connected with the tooth pressing plate in an abutting mode, and a rack matched with the tooth pressing plate is arranged on the seat back. One side end, far away from the rotating shaft, of the shaft sleeve is a pushing end; when the shaft sleeve rotates around the central axis of the rotating shaft and the pushing end pushes the tooth pressing plate to move backwards to be engaged with the rack, the position of the headrest assembly is fixed; when the shaft sleeve rotates around the central axis of the rotating shaft and the pushing end is far away from the tooth pressing plate, the tooth pressing plate moves forwards under the action of external force and is separated from the rack, and at the moment, the headrest assembly moves up and down. Any height adjustment of the headrest assembly is achieved through cooperation of the shaft sleeve, the tooth pressing plate and the rack, so that vibration and stagnation are avoided when the height is adjusted, the number of parts is small, cost is low, and operation is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile safety products, in particular to a headrest height adjustment structure and a child safety seat. Background Art

[0002] The height of the headrest of a child safety seat can generally be adjusted up and down to accommodate children of all ages. However, most of the headrests currently on the market have stepless adjustment structures that are complex, costly, and difficult to operate. Utility Model Content

[0003] In order to solve at least one aspect of the above problems, the utility model first provides a headrest height adjustment structure, including a seat back and a headrest assembly connected to each other for vertical movement, the headrest assembly including a toothed plate and a shaft sleeve abutting and connected to the toothed plate, the seat back is provided with a rack matched with the toothed plate, the shaft sleeve is eccentrically mounted with a rotating shaft, and the side end of the shaft sleeve away from the rotating shaft is a pushing end; when the shaft sleeve is rotated around the central axis of the rotating shaft and the pushing end pushes the toothed plate to move backward until the toothed plate is engaged with the rack, the position of the headrest assembly is fixed; when the shaft sleeve is rotated around the central axis of the rotating shaft and the pushing end is away from the toothed plate, the toothed plate moves forward under the action of external force and is separated from the rack, and at this time the headrest assembly can move up and down relative to the seat back.

[0004] Optionally, the shaft sleeve is provided with a through hole penetrating in the up-down direction, the rotating shaft is penetrated through the through hole, and when the rotating shaft is rotated, the shaft sleeve rotates synchronously with the rotating shaft.

[0005] Optionally, the headrest assembly further includes a headrest, the shaft portion is passed through the headrest, a handle portion extends from the upper end of the shaft, and the handle portion is located above the headrest.

[0006] Optionally, a guide groove is provided on the tooth-pressing plate, and when the rack and the tooth-pressing plate are engaged with each other, the pushing end abuts against the guide groove.

[0007] Optionally, the cross-section of the sleeve is elliptical or egg-shaped.

[0008] Optionally, the headrest assembly also includes a headrest, which is recessed with a mounting groove, the tooth pressure plate and the sleeve are both installed in the mounting groove, an opening is provided on a side of the mounting groove close to the rack, and the tooth pressure plate is slidably connected to the opening in the front-to-back direction.

[0009] Optionally, a mounting column is protruding from one side of the mounting slot close to the tooth-pressing plate, a spring is sleeved on the mounting column, a mounting portion cooperating with the mounting column is provided on the tooth-pressing plate, and two ends of the spring respectively abut against the mounting slot and the tooth-pressing plate.

[0010] Optionally, a limit block is provided in the installation groove, and the shaft sleeve is always abutted between the limit block and the tooth-pressing plate, and the limit block is used to limit the rotation position of the shaft sleeve.

[0011] Optionally, a guide block is provided in the mounting groove, and a guide opening which is slidably matched with the guide block in the front and rear directions is provided on the tooth-pressing plate.

[0012] Compared with the prior art, the headrest height adjustment structure in the utility model drives the pressure tooth plate to move backward by rotating the shaft sleeve, so that the pressure tooth plate and the rack are engaged to achieve the height fixation of the headrest assembly. When the pressure tooth plate is separated from the rack, the headrest assembly can move up and down to adjust the height. In this way, there will be no vibration or stagnation when adjusting the height, and stepless adjustment can be achieved to complete the adjustment of the headrest assembly to any height. The number of parts is small, the cost is low, and the operation is simple.

[0013] In addition, the utility model provides a child safety seat, comprising the headrest height adjustment structure as described above.

[0014] Compared with the prior art, the child safety seat described in the present invention and the above-mentioned headrest height adjustment structure have the same advantages over the prior art, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a child safety seat according to an embodiment of the present utility model;

[0016] Figure 2 It is a schematic diagram of the headrest assembly moving upward according to an embodiment of the utility model;

[0017] Figure 3 An exploded view of a child safety seat according to an embodiment of the present utility model;

[0018] Figure 4 for Figure 3 A magnified view of middle;

[0019] Figure 5 A schematic diagram of a headrest assembly according to an embodiment of the present utility model;

[0020] Figure 6 for Figure 5 Enlarged view of middle B;

[0021] Figure 7 It is a cross-sectional view of the embodiment of the utility model in which the pressure tooth plate and the rack are separated;

[0022] Figure 8 for Figure 7 Enlarged view of middle C;

[0023] Fig. 9 for Figure 7 Enlarged view of middle D;

[0024] Fig.10 A cross-sectional view of the engagement between the tooth pressing plate and the rack according to an embodiment of the utility model;

[0025] Fig.11 for Fig.10 Enlarged view of E in the middle;

[0026] Fig.12 for Fig.10 Enlarged view of F.

[0027] Description of reference numerals:

[0028] 1. Chair back; 11. Rack; 2. Headrest assembly; 21. Pressing plate; 211. Mounting portion; 212. Guide opening; 213. Guide groove; 22. Rotating shaft; 221. Handle portion; 23. Bushing; 231. Through hole; 232. Push end; 24. Headrest; 25. Mounting groove; 251. Opening; 252. Mounting column; 253. Spring; 254. Limit block; 255. Guide block; 26. Limit screw. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] In the description of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate positions or location relationships that are based on the positions or location relationships when the product is in normal use.

[0031] The terms "first" and "second" are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. The drawings of the embodiments of the present utility model are provided with a coordinate system XYZ, wherein the positive direction of the X-axis represents the left, the reverse direction of the X-axis represents the right, the positive direction of the Y-axis represents the front, the reverse direction of the Y-axis represents the back, the positive direction of the Z-axis represents the top, and the reverse direction of the Z-axis represents the bottom.

[0032] The utility model provides a headrest height adjustment structure, combined with Figures 1 to 12As shown, it includes a chair back 1 and a headrest assembly 2 which are connected to each other for vertical movement, the headrest assembly 2 including a toothed plate 21 and a sleeve 23 which is abutted against the toothed plate 21, the chair back 1 is provided with a rack 11 which is adapted to the toothed plate 21, a rotating shaft 22 is eccentrically mounted on the sleeve 23, and a side end of the sleeve 23 which is away from the rotating shaft 22 is a pushing end 232; when the sleeve 23 is rotated around the central axis of the rotating shaft 22 and the pushing end 232 pushes the toothed plate 21 to move backward until the toothed plate 21 is engaged with the rack 11, the position of the headrest assembly 2 is fixed; when the sleeve 23 is rotated around the central axis of the rotating shaft 22 and the pushing end 232 is away from the toothed plate 21, the toothed plate 21 moves forward under the action of an external force and is separated from the rack 11, and at this time the headrest assembly 2 can move up and down relative to the chair back 1.

[0033] like Figure 8 As shown, in this embodiment, the pressure plate 21 is provided with a first wave tooth, and the rack 11 is provided with a second wave tooth, and the first wave tooth is adapted to the second wave tooth. The first wave tooth and the second wave tooth are engaged to achieve the fixation between the pressure plate 21 and the rack 11.

[0034] The sleeve 23 can be fixed in the headrest assembly 2 by rotating the upper and lower ends. Since the rotating shaft 22 is eccentrically arranged on the sleeve 23, when the sleeve 23 is rotated, the pushing end 232 will gradually approach the tooth-pressing plate 21 during the rotation process, and at the same time push the tooth-pressing plate 21 to move backward, so that the tooth-pressing plate 21 is engaged with the rack 11. At this time, the position between the tooth-pressing plate 21 and the rack 11 is fixed, and the position between the headrest assembly 2 and the seat back 1 is also fixed.

[0035] When the shaft sleeve 23 is rotated in the same direction or reverse direction again, the pushing end 232 gradually moves away from the tooth pressure plate 21, and the thrust exerted by the pushing end 232 on the tooth pressure plate 21 gradually disappears. At this time, the tooth pressure plate 21 is brought back to its original position by external force or the elastic force of the spring 253, so that the tooth pressure plate 21 is separated from the rack 11. The headrest assembly 2 can move up and down without rubbing against the rack 11 during movement, eliminating the vibration and stagnation during movement, so as to complete the adjustment of the headrest assembly 2 to any height, with a small number of parts, low cost and simple operation.

[0036] like Figure 5 and 6 As shown, the shaft sleeve 23 is provided with a through hole 231 penetrating in the up-down direction, and the rotating shaft 22 is penetrated in the through hole 231 . When the rotating shaft 22 is rotated, the shaft sleeve 23 rotates synchronously with the rotating shaft 22 .

[0037] The cross section of the rotating shaft 22 is circular, and the cross section of the through hole 231 is also circular. The size of the through hole 231 is adapted to the size of the rotating shaft 22 .

[0038] In this embodiment, a limit screw 26 is fixed to the lower end of the rotating shaft 22 to limit the upward displacement of the rotating shaft 22. When the rotating shaft 22 moves upward, the limit screw 26 abuts against other parts in the headrest assembly 2 to limit the upward movement of the rotating shaft 22. Similarly, a limit screw 26 can also be fixed to the upper end of the rotating shaft 22 to limit the downward displacement of the rotating shaft 22. That is, the positions of the rotating shaft 22 and the headrest assembly 2 in the up and down directions are fixed to each other. When the pressure plate 21 and the rack 11 are engaged with each other, when the rotating shaft 22 is moved in the up and down directions, it can drive the headrest assembly 2 to move up and down synchronously relative to the chair back 1, so that the position change process of the headrest assembly 2 is more reliable.

[0039] Preferably, Fig. 9 and 12 As shown, the headrest assembly 2 further includes a headrest 24 , the shaft 22 is partially inserted into the headrest 24 , a handle portion 221 extends from the upper end of the shaft 22 , and the handle portion 221 is located above the headrest 24 .

[0040] The handle 221 is located above the headrest assembly 2, so that the user can rotate the shaft 22 through the handle 221 to drive the sleeve 23 to rotate synchronously with the shaft 22, which makes it more convenient for the user to rotate the sleeve 23. Part of the shaft 22 is accommodated inside the headrest 24, which can be more beautiful and save space.

[0041] In this embodiment, the rotating shaft 22 is in an inverted L shape, and the transverse portion of the inverted L shape is the handle portion 221. Fig. 9 As shown, when the plane where the inverted L shape is located is nearly perpendicular to the plane where the rack 11 is located, the tooth pressing plate 21 is separated from the rack 11, and at this time the headrest assembly 2 can move up and down relative to the seat back 1; Fig.12 As shown, when the plane where the inverted L shape is located is approximately parallel to the plane where the rack 11 is located, the tooth pressing plate 21 is engaged with the rack 11 , and at this time, the headrest assembly 2 is fixed relative to the seat back 1 .

[0042] The handle 221 can be arranged to facilitate the user to rotate while observing the rotation state of the rotating shaft 22, and when the tooth-pressing plate 21 is separated from the rack 11, the user can drive the entire headrest assembly 2 to move upward or downward through the handle 221. In other embodiments, the handle 221 can also be arranged in a knob shape or an arch shape.

[0043] Preferably, the cross section of the shaft sleeve 23 is elliptical or egg-shaped. The elliptical or egg-shaped structure can make the rotation of the shaft 22 smoother. The direction of rotating the shaft sleeve 23 is affected by the shape of the shaft sleeve 23. Figure 6 As shown, in this embodiment, the cross section of the shaft sleeve 23 is egg-shaped, and the two ends of the egg shape are divided into a rounded end and a pointed end. The rotating shaft 22 is arranged at the rounded end, and the pointed end is the pushing end 232. When the shaft sleeve 23 is rotated around the central axis of the rotating shaft 22, the pointed end pushes the tooth-pressing plate 21 to move backward, so that the tooth-pressing plate 21 is engaged with the rack 11; then, the shaft sleeve 23 is continuously rotated in the same direction or in the opposite direction to make the pointed end away from the tooth-pressing plate 21. After the tooth-pressing plate 21 loses the pressure of the pointed end, it returns to the original position by external force or the elastic force of the spring 253, and the tooth-pressing plate 21 is separated from the rack 11. When the rotating shaft 22 is arranged at the pointed end, the rounded end is the pushing end 232, and its working principle is as described above, which will not be repeated here.

[0044] When the cross section of the shaft sleeve 23 is an ellipse, the rotating shaft 22 can be arranged at the center of the ellipse, and both ends of the ellipse can be the pushing ends 232. When the rotating shaft 22 is arranged at any end of the ellipse, the other end is the pushing end 232. The working principle is as described above and will not be repeated here.

[0045] Preferably, if Figure 4 As shown, a guide groove 213 is provided on the tooth pressing plate 21 . When the rack 11 and the tooth pressing plate 21 are engaged with each other, the pushing end 232 abuts against the guide groove 213 .

[0046] The cross section of the guide groove 213 is approximately arc-shaped, and the arc-shaped setting provides a guide for the rotation of the sleeve 23. The lowest end of the arc is suitable for abutting the pushing end 232 to fix the position of the sleeve 23, so as to achieve the bite fixation between the pressure plate 21 and the rack 11. When the user rotates the rotating shaft 22 to drive the sleeve 23 to rotate, the sleeve 23 gradually moves away from the guide groove 213 along the arc-shaped guide structure under the action of external force, so as to end the pushing of the pressure plate 21.

[0047] like Figure 4 and 6 As shown, the headrest assembly 2 also includes a headrest 24, which is recessed with a mounting groove 25, in which the tooth-pressing plate 21 and the shaft sleeve 23 are both mounted, and an opening 251 is provided on one side of the mounting groove 25 close to the rack 11, and the tooth-pressing plate 21 is slidably connected to the opening 251 in the front-to-back direction.

[0048] In this embodiment, the toothed portion of the toothed plate 21 extends out of the opening 251 so as to engage with the rack 11. The user can directly rotate the shaft sleeve 23 by inserting his hand into the mounting groove 25, or directly push the toothed plate 21 forward and backward by external force. Preferably, the toothed plate 21 is provided with a pull block or a pull ring (not shown) for the convenience of the user to pull, and the user can pull the toothed plate 21 through the pull block or the pull ring to move the toothed plate 21 forward and separate from the rack 11.

[0049] In this embodiment, the sleeve 23 is fixed on the shaft 22 and abuts against the bottom wall of the mounting groove 25 due to gravity, and the limit screw 26 at the bottom of the shaft 22 is arranged below the bottom wall, so the sleeve 23 limits the downward displacement of the shaft 22, and the limit screw 26 limits the upward displacement of the shaft 22. With the cooperation of the sleeve 23 and the limit screw 26, the shaft 22 is fixed relative to the headrest assembly 2 in the up and down direction.

[0050] Preferably, if Figure 4 and 6 As shown, a mounting column 252 is protruded on one side of the mounting groove 25 close to the tooth-pressing plate 21, and a spring 253 is sleeved on the mounting column 252. The tooth-pressing plate 21 is provided with a mounting portion 211 that cooperates with the mounting column 252, and the two ends of the spring 253 respectively abut the mounting groove 25 and the tooth-pressing plate 21.

[0051] The spring 253 provides a rebound force for the tooth pressing plate 21. Fig.11 As shown, the shaft sleeve 23 is rotated to push the tooth-pressing plate 21 to move backward, at which time the spring 253 is squeezed, and the tooth-pressing plate 21 is engaged with the rack 11; Figure 8 As shown, when the shaft sleeve 23 continues to rotate so that the pushing end 232 gradually moves away from the tooth-pressing plate 21 , the tooth-pressing plate 21 returns to its original position under the elastic force of the spring 253 , and the tooth-pressing plate 21 is separated from the rack 11 .

[0052] In this embodiment, two mounting posts 252, two springs 253 and two mounting portions 211 are provided. The mounting portions 211 are provided at oblique symmetrical angles of the tooth pressing plate 21, so that the elastic force of the springs 253 on the tooth pressing plate 21 is more uniform and the restriction on the rotation trajectory of the shaft sleeve 23 is reduced.

[0053] like Figure 6 , Figure 8 , Fig.11 As shown, a limit block 254 is provided in the installation groove 25 , and the shaft sleeve 23 is always abutted between the limit block 254 and the tooth-pressing plate 21 . The limit block 254 is used to limit the rotation position of the shaft sleeve 23 .

[0054] The limit block 254 is arranged in front of the shaft sleeve 23 so that the shaft sleeve 23 is limited between the tooth pressing plate 21 and the limit block 254. At the same time, because the shaft sleeve 23 abuts against the tooth pressing plate 21, the limit block 254 also indirectly limits the forward movement distance of the tooth pressing plate 21.

[0055] When the tooth pressing plate 21 moves forward under the elastic force of the spring 253 , because the shaft sleeve 23 abuts against the limit block 254 , the tooth pressing plate 21 abuts against the shaft sleeve 23 , thereby indirectly limiting the forward movement distance of the tooth pressing plate 21 .

[0056] The sleeve 23 is rotated so that when the push end 232 abuts against the guide groove 213, the other end of the sleeve 23 away from the push end 232 abuts against the limit block 254. Under the action of the limit block 254 and the guide groove 213, the sleeve 23 is limited between the limit block 254 and the guide groove 213.

[0057] Preferably, if Figure 4 and 6 As shown, a guide block 255 is provided in the installation groove 25 , and a guide opening 212 which is slidably matched with the guide block 255 in the front and rear directions is provided on the tooth pressing plate 21 .

[0058] In this embodiment, the guide blocks 255 are protrudingly arranged on the left and right side walls of the mounting slot 25, and the left and right ends of the tooth pressing plate 21 are also provided with the guide openings 212 at the corresponding positions. The guide blocks 255 provide a guide for the shaft sleeve 23 to push the tooth pressing plate 21 backward, and the guide blocks 255 also provide a guide for the spring 253 to rebound and push the tooth pressing plate 21 forward.

[0059] Another embodiment of the utility model provides a child safety seat, comprising the headrest height adjustment structure as described above.

[0060] Although the disclosure is as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A headrest height adjustment structure, characterized in that: The invention comprises a chair back (1) and a headrest assembly (2) which are connected to each other so as to move up and down, the headrest assembly (2) comprising a toothed plate (21) and a shaft sleeve (23) which is connected to the toothed plate (21), the chair back (1) is provided with a rack (11) which matches the toothed plate (21), a rotating shaft (22) is eccentrically mounted on the shaft sleeve (23), and a side end of the shaft sleeve (23) which is away from the rotating shaft (22) is a pushing end (232); when the shaft sleeve (23) is rotated around the central axis of the rotating shaft (22), and the pushing end (232) pushes the tooth-pressing plate (21) to move backward until the tooth-pressing plate (21) engages with the rack (11), and the position of the headrest assembly (2) is fixed; when the shaft sleeve (23) is rotated around the central axis of the rotating shaft (22), and the pushing end (232) is moved away from the tooth-pressing plate (21), the tooth-pressing plate (21) moves forward under the action of an external force and separates from the rack (11), and at this time the headrest assembly (2) can move up and down relative to the chair back (1).

2. The headrest height adjustment structure according to claim 1, characterized in that: The shaft sleeve (23) is provided with a through hole (231) penetrating in the up-down direction, and the rotating shaft (22) is penetrated through the through hole (231). When the rotating shaft (22) is rotated, the shaft sleeve (23) rotates synchronously with the rotating shaft (22).

3. The headrest height adjustment structure according to claim 1, characterized in that: The headrest assembly (2) also includes a headrest (24), the rotating shaft (22) is partially inserted into the headrest (24), a handle portion (221) extends from the upper end of the rotating shaft (22), and the handle portion (221) is located above the headrest (24).

4. The headrest height adjustment structure according to claim 1, characterized in that: The tooth-pressing plate (21) is provided with a guide groove (213), and when the rack (11) and the tooth-pressing plate (21) are engaged with each other, the pushing end (232) abuts against the guide groove (213).

5. The headrest height adjustment structure according to claim 1, characterized in that: The cross section of the shaft sleeve (23) is oval or egg-shaped.

6. The headrest height adjustment structure according to any one of claims 1 to 5, characterized in that: The headrest assembly (2) also includes a headrest (24), the headrest (24) is recessed with a mounting groove (25), the tooth-pressing plate (21) and the shaft sleeve (23) are both mounted in the mounting groove (25), an opening (251) is provided on a side of the mounting groove (25) close to the rack (11), and the tooth-pressing plate (21) is slidably connected to the opening (251) in the front-rear direction.

7. The headrest height adjustment structure according to claim 6, characterized in that: A mounting column (252) is protrudingly provided on one side of the mounting groove (25) close to the tooth-pressing plate (21); a spring (253) is sleeved on the mounting column (252); a mounting portion (211) cooperating with the mounting column (252) is provided on the tooth-pressing plate (21); and two ends of the spring (253) respectively abut against the mounting groove (25) and the tooth-pressing plate (21).

8. The headrest height adjustment structure according to claim 6, characterized in that: A limit block (254) is provided in the installation groove (25), the shaft sleeve (23) is always in contact between the limit block (254) and the tooth-pressing plate (21), and the limit block (254) is used to limit the rotation position of the shaft sleeve (23).

9. The headrest height adjustment structure according to claim 6, characterized in that: A guide block (255) is provided in the installation groove (25), and a guide opening (212) is provided on the tooth pressing plate (21) for front-rear sliding cooperation with the guide block (255).

10. A child safety seat, characterized in that: It comprises a headrest height adjustment structure as described in any one of claims 1 to 9.

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