CN1171349A

CN1171349A - Integral manufacture method for front fork of bicycle

Info

Publication number: CN1171349A
Application number: CN 97116322
Authority: CN
Inventors: 林文彦
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-08-11
Filing date: 1997-08-11
Publication date: 1998-01-28

Abstract

An integral forming method for the front fork of bicycle includes such technological steps as pressing the both ends of a tubular material to flatten, them, making an opening at each end respectively, directly bending it to become a U -shaped member, drilling a central hole on the member, inserting a vertical tube in the hole and welding them together, and features simple process, saving raw material and low cost.

Description

Integral manufacture method for front fork of bicycle

The present invention relates to a kind of attachments of a bicycle manufacture method, mainly refer to the integrated manufacture method of front fork of bicycle.

At present, the structure of standard bicycle antefurca as shown in Figure 1, comprises left and right two furcula 101a, 101b, and one fixes the joint 102 of this two furculas, one end and is fixed on vertical riser 103 on this joint 102; The high and steep structure of another kind of front fork as shown in Figure 2, comprises left and right two furcula 101a ', 101b ' and connects the joint 102 ' of these two furcula 101a ', a 101b ' end, connects the vertical riser 103 ' on this joint 102 ' in addition; After each member branch of above-mentioned two kinds of traditional antefurcas is made moulding in addition, fixing with the welding of welding manners such as brazing, argon arc welding again.So work programme complexity, and waste material can't cost-cuttings.

In view of this, the purpose of this invention is to provide a kind of integral manufacture method for front fork of bicycle, can become U type spare, simplify work programme, also saved work material with a bending pipes.

The object of the present invention is achieved like this: a kind of integral manufacture method for front fork of bicycle, and the step of its feature is:

1) the opening slotted eye is flattened and makes respectively at long tubing two ends;

2) tubing is directly curved U-shaped spare;

3) place gets out a circular hole in the middle of U-shaped spare;

4) again a vertical tube one end is inserted in the above-mentioned circular hole, and the antefurca product that is welded into a whole.

Above-mentioned antefurca is made up of a U-shaped spare and the vertical tube that welds on it.

Owing to adopt such scheme: reduce production costs greatly.

The present invention is further described below in conjunction with drawings and Examples.

A kind of structural representation of Fig. 1 standard bicycle furcula;

The another kind of structural representation of Fig. 2 standard bicycle antefurca;

The first operation scheme drawing of Fig. 3 exemplary embodiments manufacture method of the present invention;

The second operation scheme drawing of Fig. 4 exemplary embodiments manufacture method of the present invention;

The 3rd operation scheme drawing of Fig. 5 exemplary embodiments manufacture method of the present invention;

The finished product scheme drawing of Fig. 6 exemplary embodiments of the present invention;

At first, flattened respectively, and made open slot 1a, 1b as accommodating the front wheel spindle place, as shown in Figure 3 at the two ends of the tubing 1 (shown in imaginary line) of a suitable length;

Thereafter, the tubing 1 that adds two ends directly is bent to U-shaped spare 2, two 2a, the 2b of this U-shaped spare 2 are promptly as left and right two furculas of traditional antefurca, and two furcula spacings are suitable with the wheel spacing, and at the position, upper end of U-shaped spare 2, the place gets out a circular hole 3 in the centre, as shown in Figure 4; Insert vertical tube 5 at above-mentioned circular hole 3, as shown in Figure 5 again;

At last, be fixed on the U spare 2 through welding vertical tube 5, constitute antefurca, as shown in Figure 6, this antefurca comprises by the direct bending U-shaped spare 2 of a tubing, and a vertical tube 5 directly is inserted in the circular hole 3 of upper end, U-shaped spare 2 middle parts, and weld together is formed.

Claims

1, a kind of integral manufacture method for front fork of bicycle, the step of its feature is:

1) opening slotted eye (1a), (1b) are flattened and made respectively in a long tubing (1) two ends;

2) tubing (1) is directly curved U-shaped spare (2);

3) place gets out a circular hole (3) in the middle of U-shaped spare (2);

4) again a vertical tube (5) one ends are inserted in the above-mentioned circular hole (3), and the antefurca product that is welded into a whole.

2, by the described integral manufacture method for front fork of bicycle of claim 1, it is characterized in that: above-mentioned antefurca is made up of a U-shaped spare (2) and the vertical tube (5) that welds on it.