Backrest height adjusting mechanism and lunch break chair

Abstract

The utility model provides a back height adjusting mechanism and noon break class chair. Back height adjusting mechanism includes back, guide rod and limit slide, is provided with guide hole and stroke groove on the back, stroke groove has two groove side walls, is provided with a plurality of positioning slot on each groove side wall, limit slide is fixed in guide rod, and is slidably arranged in stroke groove, and the opposite surface of limit slide in left and right directions is provided with elastic protrusion, and elastic protrusion cooperates with positioning slot, is used for limiting the movement of limit slide in stroke groove, and then limit the movement of guide rod in guide hole. When the height of back needs to be adjusted, upward or downward force is applied to the back, under the action of external force, elastic protrusion removes from positioning slot, limit slide moves in stroke groove, guide rod moves in guide hole, thereby making the back move up and down, realize the adjustment of back height, and the structure is simple, and convenient processing preparation.

Description

Technical Field

[0001] This utility model relates to the field of school chairs, and in particular to a backrest height adjustment mechanism and a lunch break school chair. Background Technology

[0002] Students vary considerably in height, and using chairs with a uniform backrest height during lunch breaks would not meet the comfort needs of all students. To accommodate students of different heights, the chair backrests need to be designed with an adjustable height. However, existing height-adjustable mechanisms are complex and inconvenient to assemble. Utility Model Content

[0003] This utility model provides a backrest height adjustment mechanism and a lunch break chair, which has a simple structure and is easy to assemble.

[0004] On the one hand, this utility model provides a backrest height adjustment mechanism, including a backrest, a guide rod and a limiting slider;

[0005] The backrest is provided with a guide hole and a travel groove. The guide rod is slidably inserted into the guide hole along its own axis. The travel groove is a strip-shaped groove arranged along the axis of the guide rod. The travel groove connects the hole wall of the guide hole with the back side of the backrest. The travel groove has two groove sidewalls, which are arranged opposite each other in the left-right direction. Each groove sidewall is provided with multiple positioning grooves, which are arranged along the axis of the guide rod.

[0006] The limiting slider is fixed to the guide rod and slidably disposed in the stroke groove. The limiting slider has elastic protrusions on its two opposite surfaces in the left-right direction. The elastic protrusions cooperate with the positioning groove to limit the movement of the limiting slider in the stroke groove, thereby limiting the movement of the guide rod in the guide hole.

[0007] The limiting slider includes two mounting parts and two limiting strips; the two mounting parts are arranged along the axial direction of the guide rod and are fixedly connected to the guide rod; the two ends of each limiting strip are respectively connected to the two mounting parts, the two limiting strips are arranged in the left-right direction and are spaced apart, and the elastic protrusion is located at the middle position of the length direction of the limiting strip.

[0008] The mounting part is provided with a positioning post, and the guide rod is provided with a positioning hole. The positioning post is inserted into the positioning hole.

[0009] The mounting part is also provided with a through hole, and a screw is inserted in the through hole. The screw is threadedly connected to the guide rod. The through hole on the same mounting part is close to another mounting part relative to the positioning post.

[0010] The mounting portion has its side facing the guide rod in contact with the outer wall of the guide rod; the limiting strip is spaced apart from the guide rod.

[0011] The backrest has a guide post on its back, and the guide hole is coaxially disposed inside the guide post; the travel groove is located in the upper part of the guide post.

[0012] The elastic protrusion is convex arc-shaped, and the corresponding positioning groove is concave arc-shaped.

[0013] The backrest also has a receiving groove on its back, which surrounds the outer periphery of the travel groove; the receiving groove has multiple mounting holes.

[0014] The backrest height adjustment mechanism also includes a cover plate, on the side of the cover plate facing the backrest, a plurality of mounting posts are provided, the mounting posts are inserted into the mounting holes, the cover plate is disposed in the receiving groove, and the cover plate covers the travel groove.

[0015] The guide rod, the stroke groove, the limiting slider, and the guide hole are all in pairs; the backrest is also provided with a handle hole, which is located at the middle of the top of the two guide rods.

[0016] On the other hand, this utility model also provides a lunch break chair, including a base and the aforementioned backrest height adjustment mechanism, wherein the bottom end of the guide rod is connected to the base.

[0017] The limiting slider is fixed to the guide rod and slidably disposed in the stroke groove. The limiting slider has elastic protrusions on its two opposite surfaces in the left-right direction. The elastic protrusions cooperate with the positioning groove to limit the movement of the limiting slider in the stroke groove, thereby limiting the movement of the guide rod in the guide hole.

[0018] The backrest height adjustment mechanism and lunch break chair provided by this utility model allow for backrest height adjustment by applying an upward or downward force to the backrest. Under the action of the external force, the elastic protrusion moves out of the positioning groove, the limiting slider moves in the stroke groove, and the guide rod moves in the guide hole, thereby allowing the backrest to move up and down to adjust the backrest height. When the backrest moves to the appropriate position, the elastic protrusion re-enters another positioning groove to fix the backrest position, preventing it from moving up and down without external force. The structure is simple and easy to manufacture. The stroke groove connects the hole wall of the guide hole with the back of the backrest, allowing the limiting slider to be inserted into the stroke groove at the back of the backrest and fixedly connected to the guide rod, facilitating assembly. Attached Figure Description

[0019] Figure 1A schematic diagram of the structure of the lunch break chair provided in a preferred embodiment of this utility model;

[0020] Figure 2 yes Figure 1 A schematic diagram of the backrest height adjustment mechanism of the lunch break chair;

[0021] Figure 3 yes Figure 2 Enlarged view of point A in the image;

[0022] Figure 4 yes Figure 2 A schematic diagram of the limit slider of the backrest height adjustment mechanism. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] In the diagram, units with similar structures are represented by the same labels.

[0025] Please see Figure 1 and Figure 2 This utility model provides a lunch break chair, which includes a base 200 and a backrest height adjustment mechanism 100. The backrest height adjustment mechanism 100 includes a backrest 1, a guide rod 2, and a limiting slider 3. The bottom end of the guide rod 2 is connected to the base 200, the backrest 1 is installed on the guide rod 2, and the two slide along the axial direction of the guide rod 2. The limiting slider 3 limits the relative position of the backrest 1 and the guide rod 2 to adjust the height of the backrest 1.

[0026] like Figure 2 and Figure 3 As shown, the backrest 1 is provided with a guide hole 101 and a travel groove 102. The guide rod 2 is slidably inserted into the guide hole 101 along its own axis so that the backrest 1 can slide relative to the guide rod 2, change the position of the backrest 1 on the guide rod 2, and thus realize the height adjustment of the backrest 1 to adapt to the use of students of different heights and improve the comfort of use.

[0027] The travel groove 102 is a strip-shaped section arranged along the axial direction of the guide rod 2. The travel groove 102 connects the wall of the guide hole 101 with the back of the backrest 1, allowing the limiting slider 3 to be inserted into the travel groove 102 from the back of the backrest 1. The travel groove 102 has two sidewalls 1021, which are arranged opposite each other in the left-right direction. Each sidewall 1021 has multiple positioning grooves 1022, which are arranged along the axial direction of the guide rod 2. The limiting slider 3 is fixed to the guide rod 2 and slidably disposed in the travel groove 102. The limiting slider 3 has elastic protrusions 30 on both opposite surfaces in the left-right direction. The elastic protrusions 30 cooperate with the positioning grooves 1022 to limit the movement of the limiting slider 3 in the travel groove 102, thereby limiting the movement of the guide rod 2 in the guide hole 101. It can be understood that the left-right direction referred to in this invention refers to the direction when the user is normally sitting on the afternoon nap chair.

[0028] When the height of the backrest 1 needs to be adjusted, an upward or downward force is applied to the backrest 1. Under the action of the external force, the elastic protrusion 30 moves out of the positioning groove 1022, the limiting slider 3 moves in the stroke groove 102, and the guide rod 2 moves in the guide hole 101, so that the backrest 1 can move up and down to adjust the height of the backrest 1. When the backrest 1 moves to the appropriate position, the elastic protrusion 30 enters another positioning groove 1022 to fix the position of the backrest 1, and it will not move up and down without the action of external force. This structure is simple, easy to process and manufacture, and has a low cost.

[0029] The travel groove 102 connects the wall of the guide hole 101 with the back of the backrest 1, allowing the limiting slider 3 to be inserted into the travel groove 102 from the back of the backrest 1 and fixedly connected to the guide rod 2, facilitating assembly. During assembly, the guide rod 2 can be inserted into the guide hole 101 first, with its upper part exposed through the travel groove 102. The limiting slider 3 is then inserted into the travel groove 102 and fixedly connected to the guide rod 2. Assembly is convenient and quick.

[0030] like Figure 3 and Figure 4 As shown, the limiting slider 3 includes two mounting parts 31 and two limiting strips 32. The two mounting parts 31 are arranged along the axial direction of the guide rod 2 and are fixedly connected to the guide rod 2. The two ends of each limiting strip 32 are respectively connected to the two mounting parts 31. The two limiting strips 32 are arranged in the left-right direction and are spaced apart, so that the two mounting parts 31 and the two limiting strips 32 are connected to form a block structure with a through hole in the middle.

[0031] The elastic protrusion 30 is positioned at the midpoint of the length of the limiting strip 32, allowing the limiting strip 32 to deform in the left-right direction due to its length. When the elastic protrusion 30 moves from the positioning groove 1022 to abut against the side wall 1021 of the groove, it facilitates the movement of the two elastic protrusions 30 closer together. Furthermore, when the elastic protrusion 30 corresponds to the positioning groove 1022 in the left-right direction, it can enter the positioning groove 1022, thus limiting the position of the limiting slider 3. The limiting slider 3 has a simple overall structure and low cost. In other embodiments, the elastic protrusion can also be made of elastic materials such as silicone or rubber, utilizing its own deformation to generate elastic resistance; or the elastic protrusion can be made of other structures such as an elastic positioning pin.

[0032] The elastic protrusion 30 is convex arc-shaped, and the corresponding positioning groove 1022 is concave arc-shaped, so that the elastic protrusion 30 can enter and exit the positioning groove 1022, which is conducive to the cooperation between the two.

[0033] The limiting strip 32 and the guide rod 2 are spaced apart so that they will not come into contact and the deformation of the limiting strip 32 will not be affected by the guide rod 2.

[0034] Combination Figure 3 and Figure 4 As shown, the mounting part 31 is provided with a positioning post 311, and the guide rod 2 is provided with a positioning hole 211. The positioning post 311 is inserted into the positioning hole 211. By utilizing the cooperation between the positioning post 311 and the positioning hole 211, the limiting slider 3 can be easily installed at the designated position of the guide rod 2.

[0035] The mounting part 31 is also provided with a through hole 312, and a screw 4 is inserted through the through hole 312. The screw 4 is threadedly connected to the guide rod 2, thereby firmly fixing the mounting part 31 to the guide rod 2 and ensuring that the limit slider 3 is firmly and reliably connected to the guide rod 2.

[0036] like Figure 4 As shown, the through hole 312 on the same mounting part 31 is closer to another mounting part 31 than the positioning post 311, so that the fixing position of the screw 4 is relatively close to the limiting strip 32. The deformation of the limiting strip 32 will not cause the mounting part 31 to move, further ensuring that the limiting slider 3 and the guide rod 2 are firmly and reliably connected.

[0037] The side of the mounting part 31 facing the guide rod 2 is fitted against the outer wall of the guide rod 2 to ensure a firm connection. In this embodiment, the guide rod 2 is round, and the side of the mounting part 31 facing the guide rod 2 is concave to allow them to fit together. Of course, in other embodiments, the guide rod 2 can also be square, and the side of the mounting part 31 facing the guide rod 2 can be flat.

[0038] like Figure 1 and Figure 2As shown, a guide post 11 is provided on the back of the backrest 1, and a guide hole 101 is coaxially disposed within the guide post 11. The guide post 11 facilitates the placement of the guide hole 101, allowing for better accommodation of the guide post 11 and reducing the overall material consumption of the backrest 1. The stroke groove 102 is located in the upper part of the guide post 11. When the limiting slider 3 is at the lowest end of the stroke groove 102, most of the guide rod 2 remains within the guide post 11, enabling effective support of the backrest 1 using the guide rod 2.

[0039] The guide post 11 is square-shaped, and the guide hole 101 is cylindrical, which can improve the structural strength of the guide post 11. The guide post 11 can also improve the structural strength of the backrest 1. The corresponding guide rod 2 is also cylindrical.

[0040] like Figure 3 As shown, the backrest 1 also has a receiving groove 103 on its back, which surrounds the outer periphery of the travel groove 102; the receiving groove 103 has multiple mounting holes 104. The height adjustment mechanism 100 of the backrest 1 also includes a cover plate 5, on the side of the cover plate facing the backrest 1, multiple mounting posts 51 are provided, the mounting posts 51 are inserted into the mounting holes 104, the cover plate 5 is set in the receiving groove 103, and the cover plate 5 covers the travel groove 102. The cover plate 5 can cover the travel groove 102, avoid interference from external objects on the sliding of the limiting slider 3, ensure the reliability of the movement of the backrest 1, and make the back of the backrest 1 simple, beautiful and easy to clean. The insertion and cooperation of the mounting posts 51 and the mounting holes 104 can facilitate the installation of the cover plate 5 and improve the installation efficiency.

[0041] There are two guide rods 2, and correspondingly, there are two stroke grooves 102, two limit sliders 3, two guide holes 101, two guide posts 11, and two cover plates 5, to ensure the stability of the backrest 1 during movement and to further improve the support force of the guide rods 2 on the backrest 1. The backrest 1 is also provided with a handle hole 105, which is located at the top center of the two guide rods 2. The handle hole 105 allows the user to easily access their hand to lift the backrest 1, improving ease of use.

[0042] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A backrest height adjustment mechanism, characterized in that, Includes backrest, guide rod, and limit slider; The backrest is provided with a guide hole and a travel groove. The guide rod is slidably inserted into the guide hole along its own axis. The travel groove is a strip-shaped groove arranged along the axis of the guide rod. The travel groove connects the hole wall of the guide hole with the back side of the backrest. The travel groove has two groove sidewalls, which are arranged opposite each other in the left-right direction. Each groove sidewall is provided with multiple positioning grooves, which are arranged along the axis of the guide rod. The limiting slider is fixed to the guide rod and slidably disposed in the stroke groove. The limiting slider has elastic protrusions on its two opposite surfaces in the left-right direction. The elastic protrusions cooperate with the positioning groove to limit the movement of the limiting slider in the stroke groove, thereby limiting the movement of the guide rod in the guide hole.

2. The backrest height adjustment mechanism of claim 1, wherein The limiting slider includes two mounting parts and two limiting strips; the two mounting parts are arranged along the axial direction of the guide rod and are fixedly connected to the guide rod; both ends of each limiting strip are respectively connected to the two mounting parts, the two limiting strips are arranged in the left-right direction and are spaced apart, and the elastic protrusion is located at the middle position of the length direction of the limiting strip.

3. The backrest height adjustment mechanism of claim 2, wherein, The mounting part is provided with a positioning post, and the guide rod is provided with a positioning hole, and the positioning post is inserted into the positioning hole.

4. The backrest height adjustment mechanism of claim 3, wherein, The mounting part is also provided with a through hole, and a screw is inserted in the through hole. The screw is threadedly connected to the guide rod. The through hole on the same mounting part is close to another mounting part relative to the positioning post.

5. The backrest height adjustment mechanism of claim 2, wherein, The side of the mounting part facing the guide rod is in contact with the outer wall of the guide rod; the limiting strip is spaced apart from the guide rod.

6. A backrest height adjustment mechanism according to any one of claims 1 to 5, characterised in that, The backrest has a guide post on its back, and the guide hole is coaxially disposed inside the guide post; the travel groove is located in the upper part of the guide post.

7. A backrest height adjustment mechanism according to any one of claims 1 to 5, characterised in that, The elastic protrusion is convex arc-shaped, and the corresponding positioning groove is concave arc-shaped.

8. A backrest height adjustment mechanism according to any one of claims 1 to 5, characterised in that, The backrest is also provided with a receiving groove, which surrounds the outer periphery of the travel groove; the receiving groove is provided with a plurality of mounting holes. The backrest height adjustment mechanism also includes a cover plate, on the side of the cover plate facing the backrest, a plurality of mounting posts are provided, the mounting posts are inserted into the mounting holes, the cover plate is disposed in the receiving groove, and the cover plate covers the travel groove.

9. A backrest height adjustment mechanism according to any one of claims 1-5, characterized in that There are two of each of the guide rod, the stroke groove, the limiting slider, and the guide hole; the backrest is also provided with a handle hole, which is located at the middle position of the top of the two guide rods.

10. A lunch break chair, characterized in that It includes a base and a backrest height adjustment mechanism as described in any one of claims 1 to 9, wherein the bottom end of the guide rod is connected to the base.

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