Back-and-forth adjusting mechanism for chair back

Abstract

The utility model discloses a back-back front-back adjusting mechanism which comprises a seat support, a fixing part is connected to the seat support, a telescopic part is arranged on the fixing part in a sleeved mode, a sliding rail is connected to the upper end of the fixing part, a sliding groove is formed in one side face of the sliding rail, and a plurality of positioning grooves are formed in the other side face of the sliding rail. A sliding sleeve is fixed to the telescopic part and arranged on the sliding rail in a sleeving mode, a control button is inserted into the sliding sleeve and moves in the sliding sleeve, the control button is also arranged on the sliding rail in a sleeving mode, and a positioning piece and a guiding piece are formed on the inner walls of the two sides of the control button respectively. The control button moves to enable the guiding piece to be inserted into the sliding groove or enable the positioning piece to be inserted into the positioning groove so as to adjust the position of the telescopic part, and the control button moves leftwards and rightwards to enable the positioning piece to be inserted into the positioning groove or enable the guiding piece to be inserted into the sliding groove so as to adjust or lock the position of the telescopic part.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a backrest front-back adjustment mechanism. Background Art

[0002] The existing children's sitting posture correction chairs are generally designed starting from the adjustable seat height, and can manually adjust the seat height according to the height of children, so that children can maintain a 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. Prolonged sitting at a desk like this will cause lumbar fatigue, which is further likely to lead to lumbar 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 backrest front-back adjustment mechanism 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 backrest front-back adjustment mechanism. By forming a sliding sleeve on the telescopic part and a sliding rail on the fixed part, using the left-right movement of the control button in the sliding sleeve, when the guiding part slides in the sliding groove, the telescopic part can slide along the fixed part to adjust the front-back position of the backrest. When the positioning part is inserted into the positioning groove, the position of the telescopic part is fixed, and the front-back position of the backrest is fixed, so as to adjust the front-back position of the backrest and make the backrest support the back.

[0004] The utility model provides the following technical solution: A backrest front-back adjustment mechanism, including a seat bracket, a fixed part is connected to the seat bracket, a telescopic part is sleeved on the fixed part, the telescopic part slides on the fixed part, a backrest connecting seat is connected to the telescopic part, a sliding rail is connected to the upper end of the fixed part, a sliding groove is formed on one side surface of the sliding rail, and a plurality of positioning grooves are formed on the other side surface. A sliding sleeve is fixed on the telescopic part, the sliding sleeve is sleeved on the sliding rail, a control button is inserted into the sliding sleeve, the control button moves left and right in the sliding sleeve, the control button is also sleeved on the sliding rail, a positioning part and a guiding part are respectively formed on the inner walls of both sides of the control button. When the control button moves and the guiding part is inserted into the sliding groove, the telescopic part can expand and contract along the fixed part. When the positioning part is inserted into the positioning groove, the telescopic part is locked on the fixed part.

[0005] The sliding rail includes a bottom plate and a top plate, a partition is formed between the bottom plate and the top plate, the sliding groove is formed on one side of the partition, and a plurality of the positioning grooves are evenly formed on the partition.

[0006] In order to facilitate the fixation of the sliding rail, the length of the bottom plate is greater than that of the top plate, and a connection hole is formed on the extended part of the bottom plate. The connection hole is used to install the sliding rail on the fixed part.

[0007] In order to limit the sliding stroke of the sliding groove, a sealing plate is connected to one end of the top plate and the bottom plate, and the sealing plate is also located at one end of the partition plate.

[0008] In order to make the telescopic part automatically reset, a spring fixing groove is formed at one end inside the telescopic part, a spring installation groove is formed at one end inside the fixing part, and a spring is installed between the spring installation groove and the spring fixing groove.

[0009] In order to guide the sliding of the telescopic part, a slot recessed inward is formed on the outer surface of the fixing part, and a plugging edge is formed on the inner wall of the telescopic part, and the plugging edge cooperates with the slot.

[0010] In order to adjust the height position of the fixing part, a kidney-shaped hole is formed on the seat bracket, a locking knob is connected to one side of the kidney-shaped hole, the fixing part is connected to the other end of the locking knob, the fixing part and the locking knob are connected by a screw rod, and the fixing part is located on the other side of the kidney-shaped hole.

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

[0012] (1) By forming a sliding sleeve on the telescopic part and a sliding rail on the fixing part, when the control button inside the sliding sleeve moves left and right and the guiding part slides in the sliding groove, the telescopic part can slide along the fixing part to adjust the front and back positions of the backrest. Also, the positioning part can be inserted into the positioning groove to fix the position of the telescopic part, fix the front and back positions of the backrest, support the back, and improve the comfort of the seat. This structure makes the adjustment of the telescopic part convenient, and at the same time, the structure is simple, reducing the production cost.

[0013] (2) By arranging a sealing plate at one end of the sliding rail to limit the stroke of the sliding groove and restrict the moving stroke of the telescopic part, preventing the telescopic part from slipping off the fixing part. Description of the Drawings

[0014] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0015] Figure 1 is a perspective view of the overall structure of the present utility model;

[0016] Figure 2 is an exploded view of the telescopic part and the fixing part of the present utility model;

[0017] Figure 3 is an exploded view of the telescopic part and the fixing part of the present utility model from another perspective;

[0018] Figure 4 is a sectional view of the sliding sleeve and the sliding rail of the present utility model;

[0019] Figure 5 is a schematic internal structure diagram of the telescopic part of the present utility model;

[0020] Figure 6 is a schematic internal structure diagram of the fixed part of the present utility model;

[0021] Figure 7 is a schematic structure diagram of the slide rail of the present utility model;

[0022] In the figure: 1. Fixed part; 11. Connecting block; 12. Socket; 13. Spring installation groove; 2. Telescopic part; 21. Backrest connecting seat; 22. Insertion edge; 23. Spring fixing groove; 3. Slide rail; 31. Sliding groove; 32. Positioning groove; 33. Top plate; 34. Bottom plate; 341. Connecting hole; 35. Partition; 36. Sealing plate; 4. Sliding sleeve; 41. Through hole; 5. Control button; 51. Positioning part; 52. Guide part; 6. Seat bracket; 61. Kidney-shaped hole; 7. Locking knob; 8. Backrest. Detailed implementation manners

[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. Embodiment

[0024] Please refer to Figures 1 to 3, the present utility model provides a technical solution: a backrest front and rear adjustment mechanism, including a seat bracket 6, a fixing part 1 is connected to the seat bracket 6 through a fastener, a telescopic part 2 is sleeved on the fixing part 1, the telescopic part 2 slides on the fixing part 1, both the telescopic part 2 and the fixing part 1 are sleeves inserted into each other, backrest connection seats 21 are connected to both sides of the telescopic part 2, and the backrest connection seats 21 are used to connect with the backrest. A connecting block 11 is formed on the upper end of the fixing part 1, a slide rail 3 is fixed to the upper end of the connecting block 11, a sliding groove 31 is formed on one side surface of the slide rail 3, and a plurality of positioning grooves 32 are formed on the other side surface. A sliding sleeve 4 is fixed to the telescopic part 2, and the sliding sleeve 4 is sleeved on the slide rail 3. By moving the sliding sleeve 4 sleeved on the slide rail 3, the sliding of the telescopic part 2 on the fixing part 1 is guided. A through hole 41 is formed on the side surface of the sliding sleeve 4, a control button 5 is inserted into the through hole 41, the control button 5 moves left and right in the sliding sleeve 4, and the control button 5 is also sleeved on the slide rail 3. Positioning members 51 and guiding members 52 are respectively formed on the inner walls of both sides of the control button 5. By moving the control button 5, the guiding member 52 or the positioning member 51 is inserted into the slide rail 3. When the guiding member 52 is inserted into the sliding groove 31, the telescopic part 2 can extend and retract along the fixing part 1. When the positioning member 51 is inserted into the positioning groove 32, the telescopic part 2 is locked on the fixing part 1. By moving the control button 5 left and right, the guiding member 52 is inserted into the sliding groove 31, facilitating the front and rear movement of the slide rail 3, adjusting the telescopic length of the telescopic part 2, controlling the front and rear position of the backrest 8, or inserting the positioning member 51 into different positioning grooves 32 to position the position of the telescopic part 2 on the slide rail 3, thereby fixing the telescopic position of the telescopic part 2 and positioning the position of the backrest 8 to prevent the backrest 8 from sliding. At the same time, after the front and rear positions of the backrest 8 are fixed, the back of the user can be supported, improving the comfort of the seat.

[0025] As Figure 4 and 7 shown, the slide rail 3 includes a bottom plate 34 and a top plate 33. A partition 35 is formed between the bottom plate 34 and the top plate 33. By providing the partition 35, the partition 35, the bottom plate 34, and the top plate 33 form a sliding groove 31. The sliding groove 31 is formed on one side of the partition 35, and a plurality of positioning grooves 32 are evenly formed on the other side surface of the partition 35. The sliding groove 31 on one side of the partition 35 is used to insert the guiding member 52 to guide the sliding of the telescopic part 2, and the positioning grooves 32 on the other side are used to insert the positioning member 51 to fix the position of the telescopic part 2.

[0026] As Figure 3 and 7 shown, the length of the bottom plate 34 is greater than that of the top plate 33. A connection hole 341 is formed on the protruding part of the bottom plate 34, and the connection hole 341 is used to install the slide rail 3 on the fixing part 1 through a fastener.

[0027] As Figure 7As shown, a sealing plate 36 is connected to one end of the top plate 33 and the bottom plate 34. The sealing plate 36 is also located at one end of the partition plate 35. The sealing plate 36 closes one side of the sliding groove 31 to limit the sliding of the guiding member 52. The sealing plate 36 also closes the other side of the partition plate 35 to limit the moving stroke of the positioning member 51.

[0028] As Figure 5 and 6 shown, a spring fixing groove 23 is formed at one end inside the telescopic part 2, and a spring installation groove 13 is formed at one end inside the fixing part 1. A spring is installed between the spring installation groove 13 and the spring fixing groove 23. By setting the spring, when the telescopic part 2 slides on the fixing part 1, the spring will be compressed. Using the elastic force generated by the deformation of the spring, the telescopic part 2 can achieve automatic reset.

[0029] An inwardly concave slot 12 is formed on the outer surface of the fixing part 1, and a plugging rib 22 is formed on the inner wall of the telescopic part 2. The plugging rib 22 cooperates with the slot 12. Through the plugging of the plugging rib 22 and the slot 12, the sliding between the fixing part 1 and the telescopic part 2 is guided, making the sliding of the telescopic part 2 smoother.

[0030] As Figure 1 shown, a waist-shaped hole 61 is formed in the seat bracket 6. One side of the waist-shaped hole 61 is connected with a locking knob 7. The fixing part 1 is connected to the other end of the locking knob 7. A screw rod is connected between the locking knob 7 and the fixing part 1. The screw rod and the locking knob 7 rotate together. The fixing part 1 is threadedly connected to the screw rod. The screw rod is inserted into the waist-shaped hole 61. The fixing part 1 is located on the other side of the waist-shaped hole 61. By rotating the locking knob 7, the distance between the fixing part 1 and the locking knob 7 is adjusted, so that the fixing part 1 and the locking knob 7 clamp the seat bracket 6, thereby positioning the height of the fixing part 1 and further adjusting the height of the backrest 8 to meet the usage requirements of people with different heights.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A seat back forward and backward adjustment mechanism, comprising a seat bracket, the seat bracket being connected to a fixing portion, characterized in that: The fixed part is sleeved with a telescopic part, and the telescopic part slides on the fixed part. The telescopic part is connected to a chair back connecting seat, and the upper end of the fixed part is connected to a slide rail. A sliding groove is provided on one side surface of the slide rail, and a plurality of positioning grooves are provided on the other side surface. A sliding sleeve is fixed to the telescopic part, and the sliding sleeve is sleeved on the slide rail. A control button is inserted in the sliding sleeve, and the control button moves left and right in the sliding sleeve. The control button is also sleeved on the slide rail. Positioning parts and guide parts are respectively formed on the inner walls on both sides of the control button. When the control button moves, when the guide part is inserted into the sliding groove, the telescopic part can be telescoped along the fixed part, and when the positioning part is inserted into the positioning groove, the telescopic part is locked on the fixed part.

2. The seat back forward and backward adjustment mechanism according to claim 1, characterized in that: The slide rail comprises a bottom plate and a top plate, a partition plate is formed between the bottom plate and the top plate, the sliding groove is formed on one side of the partition plate, and a plurality of positioning grooves are evenly arranged on the partition plate.

3. The seat back forward and backward adjustment mechanism according to claim 2, characterized in that: The length of the bottom plate is greater than that of the top plate, and a connecting hole is provided on the protruding portion of the bottom plate, and the connecting hole is used to install the slide rail on the fixing part.

4. The seat back forward and backward adjustment mechanism according to claim 2, characterized in that: A sealing plate is connected to one end of the top plate and the bottom plate, and the sealing plate is also located at one end of the partition plate.

5. The seat back forward and backward adjustment mechanism according to claim 1, characterized in that: A spring fixing groove is formed on one end of the telescopic part, a spring installation groove is formed on one end of the fixing part, and a spring is installed between the spring installation groove and the spring fixing groove.

6. The seat back forward and backward adjustment mechanism according to claim 1, characterized in that: An inwardly recessed slot is formed on the outer surface of the fixing portion, and an inserting edge is formed on the inner wall of the telescopic portion, and the inserting edge cooperates with the slot.

7. The seat back forward and backward adjustment mechanism according to claim 1, characterized in that: The seat support is provided with a waist hole, 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, the fixing part and the locking knob are connected by a screw, and the fixing part is located on the other side of the waist hole.

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