bicycle frame fittings

Abstract

This invention includes a first tube, a second tube, a first welded portion, a second welded portion, and a base material protrusion. The second tube is joined to the outer wall of the first tube by a bevel. The first welded portion surrounds the bevel and joins the first and second tubes. The second welded portion covers the first welded portion, surrounds the bevel, and is flush with the outer walls of the first and second tubes. The base material protrusion protrudes from the inner wall of the first tube and is distributed along the bevel. In this invention, the base material of the first and second tubes is melted to form the base material protrusion on the inner wall of the first tube, which increases the bonding strength. Furthermore, this invention smooths the second welded portion, making the appearance of each bicycle frame consistent, eliminating the need for grinding and polishing to remove solder, and retaining solder to increase bonding strength. This solves the problem of decreased bicycle frame strength caused by grinding and polishing some of the solder at the weld joints of tubes in existing bicycle frames, providing a bicycle frame tube that increases bonding strength and reduces manufacturing costs.

Claims

1. A bicycle frame fitting, comprising: a first fitting, which includes an inner tube wall and an outer tube wall; A second pipe fitting includes an inner pipe wall, an outer pipe wall, and a bevel; the bevel of the second pipe fitting is joined to the outer pipe wall of the first pipe fitting; a first welded portion is located between the first pipe fitting and the second pipe fitting, surrounds the bevel of the second pipe fitting, and joins the first pipe fitting and the second pipe fitting. And a second welded portion, which covers the first welded portion, surrounds the bevel of the second pipe fitting, and is flush with the outer wall of the first pipe fitting and the outer wall of the second pipe fitting; wherein, at least one base material protrusion protrudes from the inner wall of the first pipe fitting; the at least one base material protrusion is distributed along the bevel of the second pipe fitting.

2. The bicycle frame fitting as claimed in claim 1, wherein the first weld portion includes a plurality of spaced peaks and a plurality of troughs; the second weld portion fills the plurality of troughs of the first weld portion.

3. The bicycle frame fitting as described in claim 1 or 2, wherein the at least one base material protrusion is a plurality of base material protrusions.

Images