Bicycle seat stem structure

Abstract

This invention relates to a bicycle saddle seat tube structure, comprising: a seat tube and a tool head. The seat tube extends along an axial direction and defines a mounting end and a connecting end at opposite ends. The mounting end is for assembling a saddle, and the connecting end is provided with a first fixing part. The tool head is provided with a second fixing part and a swivel part at opposite ends. The second fixing part is for movably assembling and disassembling with the first fixing part. The maximum outer diameter of one of the tool heads is smaller than the outer diameter of one of the seat tubes, so that when the tool head is assembled at the connecting end, its radial dimension is limited to the range of the outer diameter of the seat tube, thereby allowing the tool head to be smoothly stored inside the inner tube of a bicycle frame along with the seat tube. This invention has the advantages of high maintainability and expandability, stable structural strength, high safety, and convenient storage.

Claims

1. A bicycle saddle seat post structure, comprising: a post (10) extending along an axial direction and having a seat end (11) and a connecting end (12) defined at opposite ends, the seat end (11) for assembling a saddle (30), the connecting end (12) having a first fixing part (13), and the post (10) having a post outer diameter (D1); and a tool head (20) having a second fixing part (21) and a turning part (22) at opposite ends, the second fixing part (21) being movably assembled and disassembled with the first fixing part (13), and the tool head (20) having a maximum outer diameter (D2); wherein, The maximum outer diameter (D2) of the tool head (20) is smaller than the outer diameter (D1) of the riser (10) so that the tool head (20) can be housed in the inner tube of a bicycle frame along with the riser (10).

2. The bicycle seat post structure as described in claim 1, wherein the first fixing part (13) is a non-circular inner hole, and the second fixing part (21) is a non-circular positioning part corresponding to the geometry of the first fixing part (13). By engaging the second fixing part (21) with the first fixing part (13), the tool head (20) and the post post (10) generate circumferential geometric interference to transmit the turning torque.

3. The bicycle seat post structure as described in claim 1 further includes a locking element (40) and at least one clamping member (50), wherein the tool head (20) has a through hole (23) at its center, the locking element (40) passes through the through hole (23) and is screwed onto the clamping member (50), and the clamping member (50) is forced to abut against the inner wall of the post post (10) by means of the axial tension during locking.

4. The bicycle seat post structure as described in claim 1, wherein the second fixing part (21a) of the tool head (20a) is provided with a receiving groove, a spring (61) and a steel ball (62) are provided in the receiving groove, and the inner wall surface of the first fixing part (13a) of the post (10a) is provided with an annular groove (14), and the steel ball (62) is elastically embedded in the annular groove (14) to provide a quick positioning effect.

5. The bicycle seat post structure as described in claim 1 further includes an elastic block (70) and a locking element (40b), wherein the elastic block (70) is radially expanded by the axial compression of the locking element (40b), and then rubs against the inner wall of the post (10b).

6. The bicycle seat post structure as described in claim 1, wherein a fixing block (80) is welded to the inside of the first fixing part (13c) of the post (10c), the fixing block (80) is provided with a screw hole (81), and the tool head (20c) is locked by screwing a locking element (40c) into the screw hole (81) of the fixing block (80).

7. The bicycle seat post structure as described in claim 2, wherein the non-circular inner hole of the first fixing part (13) and the non-circular positioning part of the second fixing part (21) are elliptical, square, hexagonal or plum blossom-shaped cross-section structures corresponding to each other.

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