초록 ▼

In a handle stem fixing device in a bicycle wherein a fork stem 10 is rotatably inserted into a head pipe 20 of a frame 2, the upper portion of the fork stem 10 projects out from the upper end of the head pipe 20 and, a stem-binding cylinder 30 is fixed on the upper portion of the fork stem 10 so as

In a handle stem fixing device in a bicycle wherein a fork stem 10 is rotatably inserted into a head pipe 20 of a frame 2, the upper portion of the fork stem 10 projects out from the upper end of the head pipe 20 and, a stem-binding cylinder 30 is fixed on the upper portion of the fork stem 10 so as not to rotate. Many small protrusions are formed on the outer surface of the fork stem 10 where is pressed by the stem-binding cylinder 30. The coefficient of friction between contact surfaces of the fork stem 10 and the stem-binding cylinder 30 increases because of the protrusions. The coupling power acting between the fork stem 10 and the stem-binding cylinder 30 can thus be improved.

대표청구항 ▼

In a device for fixing a handle stem of a bicycle to a fork stem of the bicycle, the fork stem being rotatably inserted into a head pipe of a frame of the bicycle, the head pipe having an upper end and the fork stem having an upper portion which projects out from the upper end of the head pipe, the

In a device for fixing a handle stem of a bicycle to a fork stem of the bicycle, the fork stem being rotatably inserted into a head pipe of a frame of the bicycle, the head pipe having an upper end and the fork stem having an upper portion which projects out from the upper end of the head pipe, the upper portion of the fork stem having an outer surface, the handle stem including a stem-binding cylinder having an inner surface, and the stem-binding cylinder being fixed on the upper portion of the fork stem, with the outer surface of the upper portion of the fork stem being pressed by the inner surface of the stem-binding cylinder so that the stem-binding cylinder does not rotate on the fork stem, an improvement wherein: the outer surface of the fork stem includes a plurality of ribs parallel to the fork stem, the ribs being located where the outer surface of the fork stem is pressed by the stem-binding cylinder; and the stem-binding cylinder includes mutually opposed tightening ears, the tightening ears being perforated by holes, the stem-binding cylinder further including a bolt penetrating the holes in the tightening ears such that an inner diameter of the stem-binding cylinder decreases as the bolt is tightened.