JPS5830587U

JPS5830587U - Bicycle back fork

Info

Publication number: JPS5830587U
Application number: JP12477581U
Authority: JP
Inventors: 金本　強; 奥田　照男; 実渡辺
Original assignee: 宮田工業株式会社
Priority date: 1981-08-25
Filing date: 1981-08-25
Publication date: 1983-02-28
Also published as: JPS6144948Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は自転車フレーム全体の側面図、第２図は要部の
横断面図、第３図はこの考案バックフォーク端部の形成
前における斜視図、第４図はシートピンの分解斜視図、
第５図は従来のバックフォーク端部の斜視図である。− １・・・バックフォーク本体パイプ、２・・・入子、３
・・・立パイプ、４・・・シートピン用孔、５・・・凹
座ぐり、７・・・シートピン、１２・・・シートポスト
。Figure 1 is a side view of the entire bicycle frame, Figure 2 is a cross-sectional view of the main parts, Figure 3 is a perspective view of this invention before the back fork end is formed, Figure 4 is an exploded perspective view of the seat pin,
FIG. 5 is a perspective view of the end of a conventional back fork. - 1...Back fork body pipe, 2...Insert, 3
...Vertical pipe, 4...Seat pin hole, 5...Concave counterbore, 7...Seat pin, 12...Seat post.

Claims

[Scope of utility model registration request]

In addition to providing a back fork whose end is filled and closed by inserting and welding the insert into the end of the back fork main body pipe,
After forming the end face into a curved surface that matches the outer peripheral surface of the vertical pipe, weld and connect it to the vertical pipe, and attach a seat pin with a recessed counterbore to the back fork end that penetrates the back fork main pipe and the insert from both outsides. A bicycle back fork with a hole that allows the seat post inside the pipe to be tightened with a seat pin.