Handlebar Stem System

Abstract

A handlebar stem system for bicycle handlebars includes a steerer tube and a handlebar stem tube. The handlebar stem tube protrudes into the steerer tube. By means of a clamping device arranged within the steerer tube, is it possible to clampingly connect handlebar stem tube and steerer tube. According to the disclosure, the clamping device includes a clamping means, such as a screw, which protrudes into the steerer tube through an insertion opening therethrough.

Claims

1. A handlebar stem system, in particular for racing bicycle handlebars, comprising a steerer tube, a handlebar stem tube protruding into the steerer tube, and a clamping device for clampingly connecting handlebar stem tube and steerer tube, wherein the clamping device comprises a clamping means protruding into the steerer tube through an insertion opening thereof.

2. The handlebar stem system according to claim 1, wherein the insertion opening is arranged in a circumferential surface of the steerer tube.

3. The handlebar stem system according to claim 1, wherein the insertion hole is arranged in a mounted state in a front area and in longitudinal direction of the steerer tube in a central area of the steerer tube.

4. The handlebar stem system according to claim 1, wherein the steerer tube comprises a receiving opening opposite the insertion opening for the clamping means.

5. The handlebar stem system according to claim 4, wherein in an area of the receiving opening, in particular in the receiving opening, a fixing element for the clamping means is provided.

6. The handlebar stem system according to claim 1, wherein the clamping means comprises a screw and that the fixing element is formed as an inner thread.

7. The handlebar stem system according to claim 1, wherein the handlebar stem tube comprises an opening which protrudes into the clamping means and is particularly guided therethrough.

8. The handlebar stem system according to claim 7, wherein the opening is provided for height adjustment of the handlebar stem tube as an oblong hole.

9. The handlebar stem system according to claim 1, wherein between the handlebar stem tube and the steerer tube at least one intermediate element is provided.

10. The handlebar stem system according to claim 9, wherein the at least one intermediate element is arranged in an intermediate space between the handlebar stem tube and the steerer tube.

11. The handlebar stem system according to claim 9, wherein two opposite intermediate elements are provided, each of which is arranged between the steerer tube and the handlebar stem tube.

12. The handlebar stem system according to claim 1, wherein the handlebar stem tube comprises a cross-sectional shape which differs from the cross-sectional shape of the steerer tube.

13. The handlebar stem system according to claim 12, wherein the handlebar stem tube comprises a non-circular cross-sectional shape.

14. The handlebar stem system according to claim 1, wherein the mounted state the steerer tube is arranged in a fork tube of a bicycle frame, wherein the fork tube comprises an access opening to the clamping means.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In the following, the disclosure is described in more detail by means of the preferred embodiment with reference to the attached drawings in which:

[0021] FIG. 1 shows a schematic partially sectioned side view of a handlebar stem system,

[0022] FIG. 2 shows a schematic sectional view along the line II-II in FIG. 1, and

[0023] FIG. 3 shows a section of the handlebar stem system in the area of the clamping device in the mounted state.

DESCRIPTION OF THE INVENTION

[0024] The handlebar stem system according to the disclosure comprises a steerer tube 10 which is connected via a fork bridge 12 with two fork legs 14, in particular integrally formed (FIG. 1). A handlebar stem tube 16 is arranged within steerer tube 10. The handlebar stem tube 16 is clampingly connected with steerer tube 10 via a clamping device 18 which substantially is also arranged within steerer tube 10.

[0025] The clamping device 18 comprises for this purpose a clamping means 20 which is designed in the shown exemplary embodiment as a screw, wherein the clamping means is arranged in an insertion opening 22. The insertion opening 22 is arranged in a circumferential surface 24 of steerer tube 10, in particular at a front side. Here, the front side is the side of the steerer tube which in the mounted state faces in the direction of travel 26.

[0026] The clamping means 20 protrudes through steerer tube 10 into an opposite receiving opening 28 which is also provided in steerer tube 10. The receiving opening 28 comprises in the shown exemplary embodiment an inner thread as a fixing element such that an outer thread of clamping means 20, which is designed as a screw, can be screwed into the inner thread.

[0027] For further improvement of the clamping connection between steerer tube 10 and handlebar stem tube 16, two intermediate elements 30, 32, such as clamping stones 30, 32, are arranged between steerer tube 10 and handlebar stem tube 16. The clamping stones 30, 32 preferably completely fill intermediate space 34 between the outer side of handlebar stem tube 16 and the inner side of steerer tube 10 (FIG. 2). For this purpose, it is also possible, as can be seen in FIG. 2, that the two intermediate elements are designed differently and that a, in the direction of travel, front intermediate element 32 is also arranged laterally adjacent to handlebar stem tube 16 or surrounds the handlebar stem tube in a U-shaped manner similar to a clamp.

[0028] Moreover, handlebar stem tube 16 comprises an opening 36 which is particularly designed as an oblong hole, wherein handlebar stem tube 16 can be designed, as illustrated, as a hollow profile. By designing opening 36 as an oblong hole in the longitudinal direction of handlebar stem tube 16, it is easily possible to adjust the height of the handlebar stem tube and thus of the handlebar stem or the handlebar, respectively. This can be realized by simply loosing screw 20 and displacing the handlebar stem tube in longitudinal direction 38. The fixation is then realized by simply tightening screw 20 and thus by clampingly holding handlebar stem tube 16 in steerer tube 10 via the two intermediate elements 30, 32.

[0029] For simple assembly, a fork tube or head tube 40 (FIG. 3) of the bicycle frame comprises an opening 42 which is also arranged in the front area of steerer tube 10. The front area is in turn the area of the steerer tube facing in the direction of travel 26. Through the opening, screw 20 can for example be loosened or fixed with a corresponding wrench. The opening 42 is closed with a plastic plug 44 or the like in order to avoid penetration of moisture.