JP2575668Y2 - Head drag - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a bicycle headlugg.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a conventional head luggage. In the figure, 1 is a substantially cylindrical main body, 2 is a fitting portion provided on the main body 1, and an end of an upper pipe (not shown) is inserted into the fitting portion 2. Reference numeral 3 denotes a fitting portion provided on the main body 1, and an end of a lower pipe (not shown) is inserted into the fitting portion 3. Reference numeral 4 denotes a large-diameter portion provided on the inner surfaces of the fitting portions 2 and 3, and the large-diameter portion 4 is provided by cutting.

In this head lugg, since the large-diameter portion 4 is provided on the inner surfaces of the fitting portions 2 and 3, the amount of insertion of the ends of the upper pipe and the lower pipe into the fitting portions 2 and 3 is regulated. can do.

[0004]

However, in such a headlugg, since the large-diameter portion 4 is provided by cutting, the machining time becomes long, so that the manufacturing cost becomes high and the large-diameter portion becomes large. In some cases, stress concentration occurs at the corner 4a of the fourth member 4, and the fitting portions 2 and 3 may be damaged at the corner 4a.

The present invention has been made to solve the above-mentioned problem, and has as its object to provide a headlugg which is inexpensive to manufacture and does not break the fitting portion.

[0006]

In order to achieve this object, in the present invention, a projection is provided on an inner surface of the fitting portion in a head lugg provided with a fitting portion on a main body.

[0007]

In this headlugg, the processing time is shortened and no stress concentration occurs at the fitting portion.

[0008]

1 is a sectional view showing a headlugg according to the present invention. In the figure, reference numeral 5 denotes a projection provided on the inner surface of the lower part of the fitting portions 2 and 3. , The projections 5 are provided.

In this head lugg, the amount of insertion of the ends of the upper pipe and the lower pipe into the fitting portions 2 and 3 is regulated by the projections 5. And since the processing time of the projection 5 is short,
Since the manufacturing cost is reduced and stress concentration does not occur in the fitting portions 2, 3, the fitting portions 2, 3
Is not damaged.

FIG. 2 is a sectional view showing another headlugg according to the present invention. In the figure, reference numeral 6 denotes fitting portions 2, 3
The protrusion 6 is provided by attaching a hemispherical tool to the slide of the press machine and pressing the tip of the tool against the outer surface of the fitting portions 2, 3. I have.

In this head lugg, the amount of insertion of the ends of the upper pipe and the lower pipe into the fitting portions 2 and 3 is regulated by the projections 6. And since the processing time of the projection 6 is short,
Since the manufacturing cost is reduced and stress concentration does not occur in the fitting portions 2, 3, the fitting portions 2, 3
Is not damaged.

FIG. 3 is a sectional view showing another headlugg according to the present invention. In the drawing, reference numeral 7 denotes fitting portions 2, 3
The projections 7 are provided on the inner surface of the lower part of the projections, and the projections 7 are provided by half-pressing of a press machine.

In this head lugg, the amount of insertion of the ends of the upper pipe and the lower pipe into the fitting portions 2 and 3 is regulated by the projections 7. And since the processing time of the projection 7 is short,
Since the manufacturing cost is reduced and stress concentration does not occur in the fitting portions 2, 3, the fitting portions 2, 3
Is not damaged.

In the above embodiment, the protrusions 5 to 7
Is provided, but a plurality of protrusions 5 to 7 may be provided. In the above-described embodiment, the projections 5 to 7 are provided on the inner surfaces of the fitting portions 2 and 3. However, the projections may be provided on the inner surfaces of the fitting portions 2 and 3 by performing overlay welding. Further, the protrusions may be provided by applying an adhesive to the inner surfaces of the fitting portions 2 and 3. In the above-described embodiment, the projections 5 to 7 are provided on the inner surfaces of the lower portions of the fitting portions 2 and 3.
Protrusions may be provided on the inner surfaces of the fitting portions 2 and 3 such as the upper portion and side portions.

[0015]

As described above, in the head lugg according to the present invention, the processing time is shortened, the manufacturing cost is reduced, and no stress concentration occurs in the fitting portion. The joint is not damaged. Thus, the effect of this invention is remarkable.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a head lugg according to the present invention.

FIG. 2 is a cross-sectional view showing another headlugg according to the present invention.

FIG. 3 is a cross-sectional view showing another headlugg according to the present invention.

FIG. 4 is a sectional view showing a conventional headlugg.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main body 2 ... Fitting part 3 ... Fitting part 5 ... Projection 6 ... Projection 7 ... Projection

Claims (1)

(57) [Scope of request for utility model registration] 1. A head lugg having a fitting portion provided on a main body, wherein a projection is provided on an inner surface of the fitting portion.