JP3001318U - Bicycle tubing - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bicycle pipe material, which has a non-circular cross-section in the shape of the holes of the pipe material and is easy to bend without causing a problem of breakage during bending. In a bicycle pipe material formed as a long tubular pipe body 10 having a hole 20, a first side portion and a second side portion which are separated from the hole 20 by two points 11 and 12 facing each other. Are provided, and the wall thicknesses of the first side part and the second side part are formed to be thicker than the wall thicknesses of the two points 11 and 12 facing each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bicycle pipe material.

[0002]

[Prior art]

 The body of a bicycle is made up of pipe materials such as seat posts, handlebars, fork tubes, top tubes, and down tubes, and the hole shape of these pipe materials is circular.

[0003]

[Problems to be solved by the device]

 However, a pipe material having a circular cross-section with holes has a risk of being damaged (breakage, cracking, etc.) during bending, which makes the processing difficult.

The present invention has been made in order to solve this problem, and provides a bicycle pipe material that has a non-circular cross-section of the hole shape of the pipe material and does not cause a problem of breakage during bending work and is easy to bend. The purpose is to provide.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a bicycle pipe material according to the present invention is a bicycle pipe material formed as a long tubular body having a hole, wherein the first side is divided into the hole by two opposing points. It is characterized in that a portion and a second side portion are provided, and the thicknesses of the first side portion and the second side portion are made thicker than the thicknesses of the two points facing each other.

Further, while forming a convex portion projecting toward the center of the pipe material along the longitudinal direction of the inner surface of the first side portion, while forming a concave portion along the longitudinal direction of the inner surface of the second side portion, When bent along the first side portion and the second side portion, the convex portion and the concave portion can be engaged with each other at the bent portion.

Further, two ribs may be provided so as to project along the longitudinal direction of the inner surface of the second side portion, and the recess may be formed between these ribs.

[0008]

[Action]

 By constructing the bicycle pipe member in this way, the pipe member can be easily bent at the above-mentioned two points facing each other, and at the same time, the moment of inertia and bending rigidity of the pipe member are improved.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a bent state of a seat post as a bicycle pipe material according to the present invention, and FIGS. 2, 3, and 4 are II-II line and III- line in FIG. 1, respectively. It is sectional drawing which follows the III line and the IV-IV line.

As shown in FIGS. 1 to 4, a seat post as a bicycle pipe member is composed of a long tubular pipe body 10 having holes 20 therein. As shown in FIG. 1, the seat post has a bent portion 15 formed horizontally at the top of the tubular body 10. The bent portion 15 is provided with, for example, an elongated hole 16 for seat attachment.

As shown in FIGS. 2 and 3, the inner surface of the hole 20 is provided with a first side portion and a second side portion that are separated by two points 11 and 12 that face each other. A convex portion 30 that projects toward the center of the pipe material is formed along the longitudinal direction of, and a concave portion 40 is formed along the longitudinal direction of the inner surface of the second side portion. The recess 40 is provided relatively between the two ribs 41 and 42 projecting along the longitudinal direction of the inner surface of the second side portion.

The wall thickness of the tubular body 10 on the first side portion and the second side portion is formed to be slightly thicker than the wall thickness of the points 11 and 12 facing each other as described above. The compressive strength in the longitudinal direction of the body 10 is significantly improved as compared with the conventional true cylindrical pipe material. Moreover, since the wall thickness at the points 11 and 12 is thinner than the other parts, the points 11 and 12 can be bent more easily than the first and second side portions. You can

As shown in FIGS. 3 and 4, the material is deformed at the bent portion 15 of the tubular body 10. The wall thicknesses on the first side portion and the second side portion are made uniform, and the recess 40 is flattened as shown in FIG. Further, when the bent portion 15 is completely compressed, the convex portion 30 is engaged with the concave portion 40. Therefore, the cross-sectional shapes shown in FIGS. 2-4 are suitable for use in bicycle seat posts.

FIG. 5 shows a first modification of the sectional view shown in FIG. In FIG. 5, the circumferential length of the thin portion provided at points 11 and 12 is longer than that of the cross-sectional views shown in FIGS. Such a cross-sectional shape of the tube body 10 is suitable for use in a handlebar of a bicycle or the like where the length of the bent portion becomes long.

FIG. 6 shows a second modification of the sectional view shown in FIG. In FIG. 6, the tubular body 10 of the tubular material has an elliptical cross-sectional shape having thin portions at the points 11 and 12 facing each other, so that the moment of inertia and the rigidity against bending are dramatically improved. The pipe material shown in FIG. 6 is suitable for use as a top tube or a down tube of a bicycle. Further, since the points 11 and 12 of the pipe body 10 are more easily bent than the thick portion of the pipe body 10, this pipe material is also suitable for use in a bicycle seat post or a handlebar.

As described above, since the pipe material according to the present invention has the cross-sectional shape of various wall thicknesses including the two thin wall portions facing each other, it can be easily bent and has a high moment of inertia and bending rigidity.

[0018]

[Effect of device]

 INDUSTRIAL APPLICABILITY As described above, the bicycle pipe material according to the present invention is a bicycle pipe material formed as a long tubular body having a hole, wherein the hole has a first side portion and a first side portion which are divided by two opposing points. Two side portions are provided, and the wall thicknesses of the first side portion and the second side portion are made larger than the wall thicknesses at the two points facing each other.

Therefore, the pipe material is easily bent at the above-mentioned two points, there is no risk of damage during the bending work, and the moment of inertia and bending rigidity of the pipe material can be dramatically improved.

Also, the bicycle pipe material according to the present invention has a convex portion projecting toward the center of the pipe material along the longitudinal direction of the inner surface of the first side portion, while the convex portion is formed along the longitudinal direction of the inner surface of the second side portion. A recess is formed so that when the pipe member is bent along the first side part and the second side part, the convex part and the concave part can be engaged with each other at the bent part.

Therefore, the convex portion can improve the average wall thickness of the first side portion to increase the rigidity of the pipe material, and at the same time, the bent portion is compressed most so that the first side portion is crimped to the second side portion. In this case, the thickness of the bent portion can be reduced, which is suitable when another component is attached to the bent portion such as a seat post of a bicycle.

Furthermore, since two ribs are provided so as to project along the longitudinal direction of the inner surface of the second side portion and the above-mentioned concave portion is formed between these ribs, the convex portion of the first side portion and the second side portion are formed. It is possible to increase the wall thickness of the second side portion while enabling the engagement with the recessed portion, and to increase the rigidity of the pipe material.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a bicycle pipe material according to the present invention is bent.

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, showing an embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view taken along line II-II of FIG. 1, showing a first modification of the present invention.

FIG. 6 is a sectional view taken along line II-II of FIG. 1, showing a second modification of the present invention.

[Explanation of symbols]

 10 Tubular body 11,12 Two points which oppose 15 Bending part 16 Oblong hole 20 Void 30 Convex part 40 Recessed part 41, 42 Rib

Claims (3)

[Scope of utility model registration request] 1. A bicycle pipe material formed as a long tubular body having a hole, wherein the hole is provided with a first side portion and a second side portion which are divided by two opposing points. A bicycle pipe material, wherein the wall thicknesses of the first side portion and the second side portion are made larger than the wall thicknesses at the portions of the two points facing each other. 2. A convex portion projecting toward the center of the pipe material is formed along the longitudinal direction of the inner surface of the first side portion, while a concave portion is formed along the longitudinal direction of the inner surface of the second side portion, and the pipe material is first. The bicycle pipe material according to claim 1, wherein the convex portion and the concave portion can be engaged with each other when bent along the side portion and the second side portion. 3. The bicycle pipe material according to claim 2, wherein two ribs are provided so as to project along the longitudinal direction of the inner surface of the second side portion, and the concave portion is formed between these ribs.