A fine-tunable automatic locking seat pipe structure

Abstract

The utility model discloses a kind of fine adjustment automatic locking seat pipe structure, it includes frame middle pipe, seat pipe, locking rod, cone seat and two wedge blocks, the lower end of the seat pipe is inserted in the upper end opening of the frame middle pipe, two through holes that are mutually symmetrical are opened on the lateral wall of the seat pipe, the thickness of the wedge block gradually decreases from top to bottom, two wedge blocks are respectively passed through two through holes, the cone seat is located between two wedge blocks, and the outer wall of the cone seat and the inner wall of two wedge blocks abutment cooperation, the locking rod passes through the cone seat, and the upper end of the locking rod and the threaded hole of the seat pipe upper end are screwed, the nut of the locking rod lower end and the bottom of the cone seat abutment cooperation, by the nut exerting torsion and drive the cone seat, two wedge blocks and the inner wall of the frame middle pipe are in turn abutting tightly. The utility model not only reliable fixed relationship, but also can hide locking mechanism, overall appearance is more simple.

Description

Technical Field

[0001] This utility model relates to bicycles, and more particularly to a finely adjustable automatic locking seat post structure. Background Technology

[0002] In existing technology, after the seatpost is inserted into the frame's bottom tube, a quick-release clip is typically used to secure it to the outside of the bottom tube. A 5mm wide groove is cut at the rear of the bottom tube to allow for slight deformation and inward retraction of the bottom tube during the locking process. This solves the problem of the seatpost being locked inside the frame's bottom tube. However, this locking method has many drawbacks. The quick-release clip is usually located externally at the top of the frame's bottom tube, and the quick-release handle is outside the frame's bottom tube. During riding, the quick-release clip may scrape against external objects, causing the handle to loosen and the seatpost to drop, posing a certain risk to the rider. In addition, the quick-release method is easily damaged, such as being easily lost. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a finely adjustable automatic locking seat tube structure that has a hidden locking mechanism, a simple appearance, and a reliable fixing relationship, in order to address the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0005] An adjustable automatic locking seat post structure includes a frame center tube, a seat post, a locking rod, a cone seat, and two wedge blocks. The lower end of the seat post is inserted into the upper opening of the frame center tube. Two symmetrical through holes are provided on the side wall of the seat post. The thickness of the wedge blocks gradually decreases from top to bottom. The two wedge blocks pass through the two through holes respectively. The cone seat is located between the two wedge blocks, and the outer wall of the cone seat abuts against the inner walls of the two wedge blocks. The locking rod passes through the cone seat, and the upper end of the locking rod is screwed into a screw hole at the upper end of the seat post. The nut at the lower end of the locking rod abuts against the bottom of the cone seat. By applying torque to the nut, the cone seat, the two wedge blocks, and the inner wall of the frame center tube are sequentially pressed together.

[0006] Preferably, an inner stepped ring is formed on the inner side of the seat tube, the locking rod passes through the inner stepped ring, and both through holes are located below the inner stepped ring.

[0007] Preferably, a spring is provided on the inner side of the cone seat, and an inner edge is formed at the lower end of the cone seat, with the spring sandwiched between the inner step ring and the inner edge.

[0008] Preferably, the inner wall of the wedge-shaped block is an arc surface.

[0009] Preferably, the wedge-shaped block is a "convex" block including an inner step portion and an outer step portion, the outer step portion passing through the through-hole, and the inner step portion being engaged with the inner side of the seat tube.

[0010] Preferably, the outer side of the outer step portion has a friction surface.

[0011] Preferably, a seat support is formed at the upper end of the seat tube, and seat cushion spring clips are fixed on both sides of the seat support.

[0012] In the micro-adjustable automatic locking seat tube structure disclosed in this utility model, two wedge-shaped blocks pass through the two openings of the seat tube respectively. After the lower end of the seat tube is inserted into the upper opening of the frame tube, the conical seat is installed between the two wedge-shaped blocks. The locking rod passes through the conical seat from bottom to top and engages with the screw hole at the upper end of the seat tube. During micro-adjustment and locking, a wrench is inserted through the lower opening of the frame tube, and torque is applied to the nut using the wrench. As the conical seat moves slightly upward, it applies a lateral thrust to the two wedge-shaped blocks, thereby causing the two wedge-shaped blocks to abut against the inner wall of the frame tube. This method not only ensures a reliable fixing relationship but also conceals the locking mechanism, resulting in a simpler overall appearance. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the locking seat post and seat cushion;

[0014] Figure 2 For the breakdown of this utility model Figure 1 ;

[0015] Figure 3 For the breakdown of this utility model Figure 2 ;

[0016] Figure 4 This is a sectional view of the seat tube;

[0017] Figure 5 This is a structural diagram of two wedge-shaped blocks. Detailed Implementation

[0018] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments.

[0019] This utility model discloses a finely adjustable automatic locking seat tube structure, combined with Figures 1 to 5As shown, it includes a frame center tube 1, a seat tube 2, a locking rod 3, a cone seat 4, and two wedge blocks 5. The lower end of the seat tube 2 is inserted into the upper opening of the frame center tube 1. Two symmetrical through holes 20 are opened on the side wall of the seat tube 2. The thickness of the wedge blocks 5 gradually decreases from top to bottom. The two wedge blocks 5 pass through the two through holes 20 respectively. The cone seat 4 is located between the two wedge blocks 5, and the outer wall of the cone seat 4 abuts against the inner wall of the two wedge blocks 5. The locking rod 3 passes through the cone seat 4, and the upper end of the locking rod 3 is screwed into the screw hole 21 at the upper end of the seat tube 2. The nut 30 at the lower end of the locking rod 3 abuts against the bottom of the cone seat 4. By applying torque to the nut 30, the cone seat 4, the two wedge blocks 5, and the inner wall of the frame center tube 1 are driven to abut against each other in sequence.

[0020] In the above structure, two wedge blocks 5 pass through the two openings 20 of the seat tube 2, and the lower end of the seat tube 2 is inserted into the upper opening of the frame tube 1. The cone seat 4 is then installed between the two wedge blocks 5. The locking rod 3 passes through the cone seat 4 from bottom to top and engages with the screw hole 21 at the upper end of the seat tube 2. During fine-tuning and tightening, a wrench is inserted through the lower opening of the frame tube 1, and torque is applied to the nut 30 using the wrench. As the cone seat 4 moves slightly upward, it applies a lateral thrust to the two wedge blocks 5, thereby causing the two wedge blocks 5 to abut against the inner wall of the frame tube 1. This method not only ensures a reliable fixing relationship but also conceals the locking mechanism, resulting in a simpler overall appearance.

[0021] To ensure that the locking rod 3 is straight and avoids bending under stress, in this embodiment, an inner stepped ring 22 is formed on the inner side of the seat tube 2, and the locking rod 3 passes through the inner stepped ring 22, with both through holes 20 located below the inner stepped ring 22.

[0022] As a preferred embodiment, a spring 6 is provided on the inner side of the cone seat 4, and an inner edge 40 is formed at the lower end of the cone seat 4. The spring 6 is sandwiched between the inner stepped ring 22 and the inner edge 40. Under the elastic force applied by the spring 6, a good reaction force can be maintained between the cone seat 4 and the locking rod 3, preventing loosening or detachment.

[0023] In order to better match the cone seat 4, in this embodiment, the inner wall of the wedge block 5 is further curved.

[0024] In this embodiment, please refer to Figure 3 and Figure 5The wedge-shaped block 5 is a "convex" block including an inner step portion 50 and an outer step portion 51. The outer step portion 51 passes through the through-hole 20, and the inner step portion 50 is engaged with the inner side of the seat tube 2. The through-hole 20 has a restrictive effect on the inner step portion 50.

[0025] To improve the locking effect, in this embodiment, the outer side of the outer step portion 51 has a friction surface 52.

[0026] For ease of use with a wrench, the nut 30 in this embodiment is an internal hex nut.

[0027] In a preferred embodiment, a seat support 23 is formed at the upper end of the seat tube 2, and seat cushion spring clips 24 are fixed on both sides of the seat support 23. The seat cushion spring clips 24 are used to install the seat cushion 25.

[0028] In the adjustable automatic locking seat post structure disclosed in this utility model, the inner bevel of the wedge block and the outer bevel of the cone seat fit together. Using the spring force, the wedge block is pushed to be squeezed by rotating the nut, extending out of the seat post cutout. This pushes the wedge block to form a squeezing friction with the inner wall of the frame's center tube. By rotating the locking nut, the rider's requirements for adjusting the saddle height and sitting posture can be met, as well as the requirement for locking the seat post to the frame's center tube.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. All modifications, equivalent substitutions or improvements made within the technical scope of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A finely adjustable automatic locking seat tube structure, characterized in that, The system includes a frame center tube (1), a seat tube (2), a locking rod (3), a cone seat (4), and two wedge blocks (5). The lower end of the seat tube (2) is inserted into the upper opening of the frame center tube (1). Two symmetrical through holes (20) are provided on the side wall of the seat tube (2). The thickness of the wedge blocks (5) gradually decreases from top to bottom. The two wedge blocks (5) pass through the two through holes (20) respectively. The cone seat (4) is located between the two wedge blocks (5). The outer wall of the cone seat (4) abuts against the inner wall of the two wedge blocks (5). The locking rod (3) passes through the cone seat (4), and the upper end of the locking rod (3) is screwed into the screw hole (21) at the upper end of the seat tube (2). The nut (30) at the lower end of the locking rod (3) abuts against the bottom of the cone seat (4). By applying torque to the nut (30), the inner wall of the cone seat (4), the two wedge blocks (5), and the frame tube (1) are driven to abut against each other in sequence.

2. The adjustable automatic locking seat tube structure as described in claim 1, characterized in that, An inner stepped ring (22) is formed on the inner side of the seat tube (2), and the locking rod (3) passes through the inner stepped ring (22). Both through holes (20) are located below the inner stepped ring (22).

3. The adjustable automatic locking seat tube structure as described in claim 2, characterized in that, A spring (6) is provided on the inner side of the cone seat (4), and an inner edge (40) is formed at the lower end of the cone seat (4). The spring (6) is sandwiched between the inner step ring (22) and the inner edge (40).

4. The adjustable automatic locking seat tube structure as described in claim 1, characterized in that, The inner wall of the wedge block (5) is an arc surface.

5. The adjustable automatic locking seat tube structure as described in claim 1, characterized in that, The wedge block (5) is a "convex" block including an inner step portion (50) and an outer step portion (51). The outer step portion (51) passes through the through hole (20), and the inner step portion (50) is engaged with the inside of the seat tube (2).

6. The adjustable automatic locking seat tube structure as described in claim 5, characterized in that, The outer side of the outer step portion (51) has a friction surface (52).

7. The adjustable automatic locking seat tube structure as described in claim 1, characterized in that, The upper end of the seat tube (2) is formed with a seat support base (23), and seat cushion spring clips (24) are fixed on both sides of the seat support base (23).

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