Up-down lifting type chair back front-back adjusting mechanism

Abstract

The utility model discloses an up-and-down lifting type chair back front-and-back adjusting mechanism which comprises a chair support connected with a fixing part, and is characterized in that the fixing part is connected with a telescopic part in a sliding manner, a chair back connecting seat is fixed on the telescopic part, the upper end of the fixing part is hinged with a locking buckle capable of swinging up and down, and the upper end of the fixing part is hinged with a locking buckle capable of swinging up and down. A positioning piece is formed at the upper end of the telescopic part, the locking buckle is a hollow shell, an embedding groove is formed in the inner wall of the locking buckle and comprises a horizontal groove and a plurality of lower grooves, the lower grooves are formed in the lower end of the horizontal groove, and the positioning piece is inserted into the lower grooves and used for fixing the position of the telescopic part. The positioning piece is inserted into the lower groove to position the position of the telescopic part, so that the telescopic position of the telescopic part is adjusted, the front-back position of the chair back is further controlled, and the chair back is attached to the back of a user and supports the back during use.

Description

Technical Field

[0001] The utility model relates to the technical field of learning chairs, in particular to a front-back adjustment mechanism for an up-and-down liftable backrest. Background Technique

[0002] The existing children's sitting posture correction chairs are generally designed starting from the adjustable seat height, and the seat height can be manually adjusted according to the height of children, so that children can maintain the correct sitting posture. However, when the existing seats are used for children to do homework at a desk, the backrest cannot fit against the back to support the back. Such long-term desk work will cause waist fatigue, further easily lead to lumbar spine deformation, and also form bad habits such as hunchback. Moreover, the existing backrest adjustment mechanisms are too complex and the production cost is high. Therefore, a front-back adjustment mechanism for an up-and-down liftable backrest is designed to simplify the structure and make the adjustment more convenient. Content of the Utility Model

[0003] The purpose of the utility model is to provide a front-back adjustment mechanism for an up-and-down liftable backrest. By setting a fixed part and a telescopic part that are sleeved with each other, a lock catch that can swing up and down is hinged on the fixed part, and a positioning part is formed on the telescopic part. The telescopic position of the telescopic part is positioned by inserting the positioning part into the lock catch, so as to further control the front-back position of the backrest, make the backrest fit against the user's back during use, and support the back.

[0004] The utility model provides the following technical solution: a front-back adjustment mechanism for an up-and-down liftable backrest, including a seat bracket, a fixed part is connected to the seat bracket, a telescopic part is slidably connected to the fixed part, a backrest connection seat is fixed on the telescopic part, a lock catch that can swing up and down is hinged to the upper end of the fixed part, a positioning part is formed at the upper end of the telescopic part, the lock catch is a hollow shell, and an embedding groove is formed on the inner wall of the lock catch. The embedding groove includes a horizontal groove and a plurality of lower grooves, and the plurality of lower grooves are all opened at the lower end of the horizontal groove. The positioning part is inserted into the lower groove for fixing the position of the telescopic part.

[0005] In order to facilitate the telescopic movement of the telescopic part sleeved on the fixed part, the fixed part and the telescopic part are mutually inserted sleeves, and the telescopic part is sleeved on the outer surface of the fixed part.

[0006] In order to enhance the connection strength between the positioning part and the lock catch, the entrance at the upper end of the lower groove is in close fit with the positioning part, and the size of the lower end of the lower groove is larger than the entrance size.

[0007] In order to make the telescopic part automatically reset, a spring limiting groove is formed at one end inside the telescopic part, a spring installation groove is formed at one end inside the fixed part, a spring positioning shaft is fixed at the center of the spring installation groove, and a spring is installed between the spring installation groove and the spring limiting groove.

[0008] In order to guide the telescopic movement of the telescopic part, a plug-in groove is formed on the outer wall of the fixed part, and a plug-in part is formed on the inner wall of the telescopic part. The plug-in part is inserted into the plug-in groove.

[0009] In order to install the fixed part on the seat bracket, a waist-shaped hole is formed on the seat bracket. A locking knob is connected to one side of the waist-shaped hole, and the fixed part is connected to the other end of the locking knob. The fixed part is located on the other side of the waist-shaped hole.

[0010] In order to facilitate the movement of the seat, a bracket grip is connected to the upper end of the seat bracket.

[0011] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0012] (1) By providing a fixed part and a telescopic part that are sleeved with each other, a locking buckle is hinged on the fixed part, and a positioning part is formed on the telescopic part. The positioning part is inserted into the lower groove to position the telescopic part, thereby adjusting the telescopic position of the telescopic part and further controlling the front-back position of the backrest, so that the backrest can fit the back during use. At the same time, the mechanism has a simple structure, low production cost, and convenient operation;

[0013] (2) Springs are arranged in the fixed part and the telescopic part to enable the telescopic part to automatically reset;

[0014] (3) A waist-shaped hole is formed on the seat bracket, and the fixed part is connected to the waist-shaped hole, so that the fixed part can move up and down along the waist-shaped hole and be fixed, realizing the adjustment of the height of the backrest to meet the usage requirements of students of different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0016] Figure 1 is a three-dimensional view of the overall structure of the present utility model;

[0017] Figure 2 is a three-dimensional view of the overall structure of the present utility model from another perspective;

[0018] Figure 3 is a schematic internal structure view of the fixed part of the present utility model;

[0019] Figure 4 is a side view of the fixed part of the present utility model;

[0020] Figure 5 is a side view of the telescopic part of the present utility model;

[0021] Figure 6 This is a sectional view of the locking buckle of the present utility model;

[0022] In the figure: 1. Telescopic part; 11. Spring limiting groove; 12. Plug-in part; 13. Positioning part; 14. Backrest connecting seat; 2. Fixed part; 21. Spring installation groove; 211. Spring positioning shaft; 22. Plug-in groove; 23. Locking buckle connecting block; 3. Locking buckle; 31. Embedded groove; 311. Horizontal groove; 312. Lower groove; 32. Lifting plate; 4. Bracket grip; 5. Locking knob; 6. Seat bracket; 61. Waist hole. Specific implementation mode

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Embodiment 1

[0025] Please refer to Figure 1 Figs. 1, 2, 4 and 6. The present utility model provides a technical solution: a front-back adjustment mechanism for the up-and-down lift type backrest, including a seat bracket 6. A fixed part 2 is connected to the seat bracket 6 through fasteners. A telescopic part 1 is slidably connected to the outer surface of the fixed part 2. A backrest connecting seat 14 is fixed on the telescopic part 1. A locking buckle connecting block 23 is formed at the upper end of the fixed part 2. A vertically swingable locking buckle 3 is hinged on the locking buckle connecting block 23. A lifting plate 32 is formed on the upper surface of the locking buckle 3. The lifting plate 32 can conveniently lift the locking buckle 3 to realize the vertical swing of the locking buckle 3. A positioning part 13 is formed at the upper end of the telescopic part 1. The locking buckle 3 is a rotatable hollow shell. An embedded groove 31 is formed in the locking buckle 3. The embedded groove 31 includes a horizontal groove 311 and a plurality of lower grooves 312. The plurality of lower grooves 312 are all opened at the lower end of the horizontal groove 311. The positioning part 13 is embedded in different lower grooves 312 to fix the sliding position of the telescopic part 1. When the positioning part 13 is in the horizontal groove 311, the telescopic position of the telescopic part 1 can be adjusted arbitrarily. First, move the positioning part 13 into the horizontal groove 311 so that the telescopic part 1 can move and stretch arbitrarily to adjust the position of the backrest. Then, lift the locking buckle 3 upward so that the positioning part 13 moves into the lower groove 312 to fix the position of the telescopic part 1, enabling the backrest to support the back and improving the comfort of the seat.

[0026] As shown in Figure 3 and 5As shown, the fixed part 2 and the telescopic part 1 are nested sleeves. The telescopic part 1 is sleeved on the outer surface of the fixed part 2. The sleeve size of the telescopic part 1 is larger than that of the fixed part 2, facilitating the sliding of the telescopic part 1 on the surface of the fixed part 2.

[0027] The entrance at the upper end of the lower groove 312 is in close fit with the positioning part 13. The size of the lower end of the lower groove 312 is larger than that of the entrance. This structure can facilitate the snapping of the positioning part 13 into the lower groove 312. At the same time, the close fit can avoid misoperation and ensure stable operation.

[0028] A spring limit groove 11 is formed at one end inside the telescopic part 1, and a spring installation groove 21 is formed at one end inside the fixed part 2. A spring positioning shaft 211 is fixed at the center of the spring installation groove 21. A spring is installed between the spring installation groove 21 and the spring limit groove 11. The spring is sleeved on the spring positioning shaft 211 to limit the deformation of the spring, enabling the spring to deform only along the spring positioning shaft 211. At the same time, the elastic force generated after the spring deforms can exert pressure on the telescopic part 1 to achieve automatic reset of the telescopic part 1.

[0029] As Figure 3 and 5 shown, a plug-in groove 22 is formed on the outer wall of the fixed part 2, and a plug-in part 12 is formed on the inner wall of the telescopic part 1. The plug-in part 12 is two parallel plug plates. The plug-in part 12 is plugged into the plug-in groove 22, enabling the telescopic part 1 to telescopically move back and forth along the plug-in groove 22 to guide the telescopic direction of the telescopic part 1.

[0030] As Figure 2 shown, a waist-shaped hole 61 is formed on the seat bracket 6. One side of the waist-shaped hole 61 is connected to a locking knob 5, and the other end of the locking knob 5 is connected to the fixed part 2. The fixed part 2 is located on the other side of the waist-shaped hole 61. The locking knob 5 also includes a screw. The height position of the fixed part 2 is adjusted by the up and down movement of the screw in the waist-shaped hole 61. Subsequently, by rotating the locking knob 5, the distance between the locking knob 5 and the fixed part 2 is reduced, clamping the seat bracket 6 between the locking knob 5 and the fixed part 2 to fix the height of the fixed part 2 and achieve fine adjustment of the height of the seat backrest.

[0031] As Figure 1 and 2 shown, a bracket grip 4 is connected to the upper end of the seat bracket 6. By providing the bracket grip 4, it is convenient for the hand to reach into the seat bracket 6 to move the position of the seat.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An up-and-down lifting type seat back front-and-rear adjustment mechanism comprises a seat bracket, to which a fixing portion is connected, characterized in that: The fixed part is slidably connected with a telescopic part, and a chair back connecting seat is fixed on the telescopic part. The upper end of the fixed part is hinged with a locking buckle that can swing up and down. A positioning piece is formed on the upper end of the telescopic part. The locking buckle is a hollow shell. An embedding groove is formed on the inner wall of the locking buckle. The embedding groove includes a horizontal groove and multiple lower grooves. The multiple lower grooves are all opened at the lower end of the horizontal groove. The positioning piece is inserted into the lower groove to fix the position of the telescopic part.

2. The up-and-down lifting chair back front-and-rear adjustment mechanism according to claim 1, characterized in that: The fixed part and the telescopic part are sleeves which are plugged into each other, and the telescopic part is sleeved on the outer surface of the fixed part.

3. The up-and-down lifting chair back front-and-rear adjustment mechanism according to claim 1, characterized in that: The inlet at the upper end of the lower groove is tightly matched with the positioning piece, and the size of the lower end of the lower groove is larger than the size of the inlet.

4. The up-and-down lifting chair back front-and-rear adjustment mechanism according to claim 1, characterized in that: A spring limiting groove is formed on one end of the telescopic part, a spring installation groove is formed on one end of the fixed part, a spring positioning shaft is fixed at the center of the spring installation groove, and a spring is installed between the spring installation groove and the spring limiting groove.

5. The up-and-down lifting chair back front-and-rear adjustment mechanism according to claim 2, characterized in that: An inserting groove is formed on the outer wall of the fixing part, and an inserting piece is formed on the inner wall of the telescopic part, and the inserting piece is inserted into the inserting groove.

6. The up-and-down lifting chair back front-and-rear adjustment mechanism according to claim 1, characterized in that: A waist hole is provided on the seat support, one side of the waist hole is connected with a locking knob, the fixing part is connected to the other end of the locking knob, and the fixing part is located on the other side of the waist hole.

7. The up-and-down lifting chair back front-and-rear adjustment mechanism according to claim 1, characterized in that: The upper end of the seat bracket is connected with a bracket handle.

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