Backrest height stepless adjusting mechanism and noon break chair

Abstract

The utility model provides a backrest height stepless adjusting mechanism and noon break class chair. Backrest height stepless adjusting mechanism includes backrest, guide rod and limit slide, is provided with guide hole and stroke slot on backrest, and guide rod is along the self axial sliding and is inserted in guide hole, stroke slot is the strip shape along the axial arrangement of guide rod, stroke slot has two slot side walls, limit slide is fixed in guide rod and is slidingly arranged in stroke slot, and the two surfaces of limit slide are provided with elastic convex in the opposite direction, and elastic convex can be elastically contacted with corresponding slot side wall. Because elastic convex can be contacted with slot side wall, the friction between the both can overcome the gravity of backrest, so that backrest will not slide down along guide rod under the action of no external force, when the height of backrest needs to be adjusted, the upward or downward force is applied to backrest, the friction between elastic convex and slot side wall is overcome, and the stepless adjustment of backrest height is realized, the structure is simple, and it is favorable to assembly.

Description

Technical Field

[0001] This utility model relates to the field of school chairs, and in particular to a backrest height stepless 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 stepless 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 stepless 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 to each other in the left-right direction.

[0006] The limiting slider is fixed to the guide rod and slidably disposed in the stroke groove. The limiting slider has elastic protrusions on two opposing surfaces in the left-right direction. The elastic protrusions can elastically abut against the corresponding sidewall of the 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] Each of the grooves has a clearance groove on its sidewall; the top of the guide hole is closed; when the top of the guide rod abuts against the top of the guide hole, the elastic protrusion is located in the clearance groove.

[0008] The elastic protrusion is convex arc-shaped, and the corresponding clearance groove is concave arc-shaped.

[0009] 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 limiting strips are spaced apart from the guide rod; the elastic protrusion is located at the middle position of the length direction of the limiting strip.

[0010] 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.

[0011] 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.

[0012] 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.

[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 stepless backrest height adjustment mechanism also includes a cover plate. The side of the cover plate facing the backrest is provided with a plurality of mounting posts. The mounting posts are inserted into the mounting holes. The cover plate is disposed in the receiving groove and 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 stepless backrest height adjustment mechanism, wherein the bottom end of the guide rod is connected to the base.

[0017] This utility model provides a stepless backrest height adjustment mechanism and a lunch break chair. Because the elastic protrusions abut against the side wall of the groove, the friction between them overcomes the weight of the backrest, preventing it from sliding down the guide rod without external force. When the backrest height needs adjustment, an upward or downward force is applied to the backrest. Under this force, the friction between the elastic protrusions and the side wall of the groove is overcome, causing the limiting slider to move in the stroke groove and the guide rod to move in the guide hole, thus allowing the backrest to move up and down, achieving stepless height adjustment. After the external force is removed, the backrest position is fixed and will not move up or down without external force. The structure is simple, easy to manufacture, and low in cost. The limiting slider has elastic protrusions on both sides in the left-right direction, which increases friction and reliably positions the backrest at a certain height for easy use. The stroke groove connects the guide hole wall to the back of the backrest, allowing the limiting slider to be inserted into the stroke groove from the back of the backrest and fixedly connected to the guide rod, facilitating assembly. Attached Figure Description

[0018] Figure 1A schematic diagram of the structure of the lunch break chair provided in a preferred embodiment of this utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of the stepless adjustment mechanism for the backrest height of the classroom chair during lunch break;

[0020] Figure 3 yes Figure 2 Enlarged view of point A in the image;

[0021] Figure 4 yes Figure 2 A schematic diagram of the backrest adjusted to its lowest position;

[0022] Figure 5 yes Figure 4 Enlarged view of point B in the image;

[0023] Figure 6 yes Figure 2 A schematic diagram of the limit slider of the stepless height adjustment mechanism for the backrest. Detailed Implementation

[0024] 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.

[0025] In the diagram, units with similar structures are represented by the same labels.

[0026] Please see Figure 1 and Figure 2 This utility model provides a lunch break chair, which includes a base 200 and a stepless backrest height adjustment mechanism 100. The stepless 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.

[0027] 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.

[0028] 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. The limiting slider 3 is fixed to the guide rod 2 and slidably disposed in the travel groove 102. Both opposing surfaces of the limiting slider 3 in the left-right direction are provided with elastic protrusions 30, which elastically abut against the corresponding sidewalls 1021 to restrict the movement of the limiting slider 3 in the travel groove 102, thereby restricting 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 lunch break chair.

[0029] Since the elastic protrusion 30 can abut against the side wall 1021 of the groove, the friction between the two can overcome the weight of the backrest 1, so that the backrest 1 will not slide down the guide rod 2 without the action of external force.

[0030] 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 friction between the elastic protrusion 30 and the side wall 1021 of the groove is overcome, causing the limiting slider 3 to move in the stroke groove 102 and the guide rod 2 to move in the guide hole 101, thereby allowing the backrest 1 to move up and down, realizing stepless adjustment of the height of the backrest 1. After the external force is removed, the position of the backrest 1 is fixed and will not move up and down without the action of external force. This structure is simple, easy to process and manufacture, and has low cost. The limiting slider 3 has elastic protrusions 30 on both sides in the left and right directions, which can increase the friction and make the backrest 1 reliably positioned at a certain height position for easy use.

[0031] 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, and then the limiting slider 3 can be inserted into the travel groove 102 and fixedly connected to the guide rod 2. Assembly is convenient and quick.

[0032] like Figure 3 , Figure 4 , Figure 5As shown, the top of the guide hole 101 is closed to prevent foreign objects from entering the guide hole. A clearance groove 1022 is provided on the side wall 1021. When the top of the guide rod 2 abuts against the top of the guide hole 101, the elastic protrusion 30 is located in the clearance groove 1022. During installation, the guide rod 2 can be inserted into the guide hole 101 first. The backrest 1 slides down along the guide rod 2 under gravity until the top of the guide rod 2 abuts against the contact part, i.e., the backrest 1 moves downward to its lowest position. At this point, the elastic protrusion 30 of the limiting slider is aligned with the clearance groove 1022 and then inserted into the stroke groove 102. Due to the clearance groove, the elastic protrusion 30 does not need to deform at this position, making it easy to insert the limiting slider 3 into the stroke groove 102, facilitating the assembly of the limiting slider 3. Then, the limiting slider 3 is fixedly connected to the guide rod 2.

[0033] If the nap chair is not used for an extended period, such as during winter or summer vacation, the backrest 1 can slide directly to its lowest point, allowing the elastic protrusion 30 to be positioned within the recess 1022. This prevents the elastic protrusion 30 from being in a deformed state for a prolonged period, thus affecting its deformation capacity and extending its service life. Figure 3 and Figure 6 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.

[0034] 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. This enables the elastic protrusion 30 to elastically abut against the side wall 1021 of the groove, providing sufficient friction to overcome the weight of the backrest. The limiting strip 32 and the guide rod 2 are spaced apart to prevent contact, and the deformation of the limiting strip 32 is not affected by the guide rod 2. 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 abutment; or the elastic protrusion can be made of other structures such as an elastic positioning pin.

[0035] The elastic protrusion 30 is convex arc-shaped, and the corresponding clearance groove 1022 is concave arc-shaped, so that the elastic protrusion 30 can enter and exit the clearance groove 1022, which is conducive to the cooperation between the two.

[0036] Combination Figure 3 and Figure 6As 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] like Figure 1 and Figure 2 As 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.

[0041] 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.

[0042] like Figure 3As 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 stepless height adjustment mechanism 100 for the backrest 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, preventing external objects from interfering with the sliding of the limiting slider 3, ensuring the reliability of the movement of the backrest 1, and making the back of the backrest 1 simple, beautiful, and easy to clean. The insertion and cooperation of the mounting posts 51 with the mounting holes 104 can facilitate the installation of the cover plate 5 and improve installation efficiency.

[0043] 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.

[0044] 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 mechanism for stepless adjustment of the height of a backrest, 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 to each other in the left-right direction. The limiting slider is fixed to the guide rod and slidably disposed in the stroke groove. The limiting slider has elastic protrusions on two opposing surfaces in the left-right direction. The elastic protrusions can elastically abut against the corresponding sidewall of the 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 mechanism according to claim 1, characterized in that Each of the grooves has a clearance groove on its sidewall; the top of the guide hole is closed; when the top of the guide rod abuts against the top of the guide hole, the elastic protrusion is located in the clearance groove.

3. The mechanism according to claim 2, characterized in that The elastic protrusion is convex arc-shaped, and the corresponding clearance groove is concave arc-shaped.

4. The mechanism according to any one of claims 1-3, characterized in that 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 limiting strips are spaced apart from the guide rod; the elastic protrusion is located at the middle position of the length direction of the limiting strip.

5. The mechanism according to claim 4, characterized in that 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.

6. The mechanism according to claim 5, characterized in that 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.

7. The backrest height stepless adjustment mechanism according to any one of claims 1-3, characterized 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.

8. The mechanism according to any one of claims 1-3, characterized 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 stepless backrest height adjustment mechanism also includes a cover plate. The side of the cover plate facing the backrest is provided with a plurality of mounting posts. The mounting posts are inserted into the mounting holes. The cover plate is disposed in the receiving groove and covers the travel groove.

9. The mechanism according to any one of claims 1-3, 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 of the top of the two guide rods.

10. A lunch break chair, characterized in that It includes a base and a stepless 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.

Images