JP2000168662A - Manufacture of v type frame for bicycle and of its design deformed reinforcing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a deformed reinforcing pipe, to display rigidity and to improve a product value by putting a designed deformed reinforcing pipe to display an aesthetic effect altering upper half and lower half shapes across a main pipe and a vertical pipe above a bracket lug and welding it. SOLUTION: A front end surface connected to a main pipe 3 is formed large in diameter by extending it to the outside and a front end flare is formed on the outside around a lower half as its center and a connected surface shape is enlarged on a design deformed reinforcing pipe 9. In the same way, a rear end part connected to a vertical pipe 5 is formed in a roughly slender shape by contracting it, a rear end flare curved to the outside is formed over an overall periphery on a rear end, overall strength is increased, a connected surface is extended, and welding such as brazing, etc., is facilitated. Additionally, an aesthetic effect is displayed by altering shapes of the front end and rear end and the upper half and lower half. A flat steel plate is punched by a press machine to manufacture the design deformed reinforcing pipes 9 at low cost and in large quantity, and a member for the design deformed reinforcing pipes is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a bicycle V-shaped frame and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a V-shaped frame for a bicycle has insufficient rigidity in terms of strength due to its shape. Auxiliary pipes and plates are attached to compensate for this lack of strength.

[0003]

As described in the previous section, auxiliary pipes and plates are attached to compensate for the lack of strength. However, taking advantage of the good point of the V-shaped frame which impairs the design. Not.

[0004] The present invention manufactures a design deformed reinforced pipe with excellent design at a low cost, reinforces the frame with this member, exhibits strong rigidity in terms of strength, and matches the V-shaped design. An object of the present invention is to provide a bicycle V-shaped frame that can increase the commercial value and can be used satisfactorily.

[0005]

A main pipe having a head pipe connected to a front end thereof is connected to a vertical pipe via a hanger lug, and a front half portion is provided in a V-shape, and a rear half portion is provided behind the vertical pipe. A main pipe and a vertical pipe above the hanger lug in a bicycle V-type frame that connects the chain stay from the hanger lug, and the backhawk from the vertical pipe, and connects the chain stay and the backhawk in a triangular shape at the end. In addition, there is provided a V-shaped frame for a bicycle, characterized in that a design deformed reinforcing pipe having an aesthetic effect due to a difference in shape between the upper half and the lower half is delivered and welded.

[0006] The design modified reinforcing pipe which is inserted and welded to the main pipe and the vertical pipe above the hanger lug has an upper half formed in a semi-circular shape, and a lower half formed above and below the pipe radius. The side width in the direction is longer than the required width, the tip is integrally connected corresponding to the V-shape, and the design variant reinforcing pipe has a cross section, the upper half of which is formed in a semi-circular shape, and the lower half of which is defined by the pipe radius. The required side width in the vertical direction is long,
The ends may be connected integrally corresponding to the V-shape.

[0007] The above-mentioned design deformed reinforcing pipe which is delivered to and welded to the main pipe and the vertical pipe above the hanger lug is formed such that the front end connected to the main pipe is expanded outward to have a large diameter and the lower half is formed. The flare is formed outside at the center to increase the rib effect and the connecting surface shape, and is narrowed down to the rear end connected to the opposite vertical pipe to form a small diameter, and the required length of the rear end is curved outward. To form
The strength may be increased, the connecting surface may be enlarged, welding such as brazing may be facilitated, and an aesthetic effect may be obtained.

[0008] A flat steel plate having a required thickness is punched out by a press machine, a member for a design deformed reinforcing pipe is provided, and the member for the design deformed reinforcing pipe is pressed by a press machine and curling is performed as required to sequentially change from a shallow curve to a deep curve. Finally, the upper half is formed into a semi-circular shape, and the opposite lower half is formed into a pipe shape having a required side width longer than the radius of the pipe and having a connected end corresponding to the V-shape. Are welded and integrated in strength, and the front end of the
A method of manufacturing a modified V-shaped frame for a bicycle, characterized in that a rear end portion of the V-shaped frame for a bicycle is cut so as to fit the vertical pipe.

[0009] A flat steel plate having a required thickness is punched by a press machine, and a member for a design deformed reinforcing pipe is provided. The member for the design deformed reinforcing pipe is pressed by a press machine, and curling is performed as required to sequentially change from a shallow curve to a deep curve. Finally, the upper half is formed into a semi-circular shape, and the opposite lower half is formed into a pipe shape having a required side width longer than the radius of the pipe and having a connected end corresponding to the V-shape. After welding, the front end and the rear end are subjected to open flaring, and then the front end and the rear end are cut to fit the main pipe and the upright pipe. In this case, a modified V-shaped frame for a bicycle may be manufactured to produce a modified reinforcing pipe.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A main pipe having a head pipe connected to a front end is connected to a vertical pipe via a hanger lug, and a side shape of a front half is provided with a V-shape, and a rear half is provided with a hanger lug behind the vertical pipe. Connect the chain stay from
In addition, in the V-type frame for bicycles that connects the backhawk from the standpipe and connects the chain stay and the backhawk in a triangle by the end, the main pipe and the standpipe above the hanger lug are at the front end and the rear end, The cross section is such that the upper half is formed in a semi-circular shape, the lower half is the required side width in the vertical direction longer than the pipe radius, the tips are connected integrally corresponding to the V-shape, the upper half and the lower half shape A V-shaped frame for a bicycle, which is formed by welding and welding a deformed reinforcing pipe having a different shape and exhibiting an aesthetic effect.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Referring to an embodiment shown in the drawings, reference numeral 1 denotes a bicycle V-shaped frame according to the present invention, in which a main pipe 3 having a front end connected to a head pipe 2 is connected to a standpipe 5 via a hanger lug 4, and A chain stay 6 is connected from the hanger lug 4 behind the standing pipe 5 and a back fork 7 is connected from the standing pipe 5, and the chain stay 6 and the back fork 7 are connected in a triangle by an end 8. I have.

A design variant reinforcing pipe 9 is inserted between the main pipe 3 and the upright pipe 5 above the hanger lug 4, and the front and rear ends of the design variant reinforcing pipe 9 are welded to the main pipe 3 and the upright pipe 5. Things.

The design variant reinforcing pipe 9 has a cross section whose upper half is formed in a semi-circular shape, and whose lower half has a side width longer than the pipe radius by a required width. ing.

The design deformed reinforcing pipe 9 further has a front end face connected to the main pipe 3 which is enlarged outward to have a large diameter, and further has a front end flare 10 centering on the lower half.
Is formed on the outside to enlarge the connecting surface shape, and similarly, the rear end portion connected to the standing pipe 5 is narrowed down to form a substantially thin shape, and the rear end flare 11 curving outward at the rear end.
Is formed on the entire circumference, increasing the overall strength, expanding the connecting surface, facilitating welding such as brazing, and changing the shape of the front and rear ends, the upper half and the lower half, and has an aesthetic effect It is like that.

As shown in FIG. 7, a flat steel plate 12 having a required thickness is punched out by a press to provide a member 13 for a design deformed reinforcing pipe in order to manufacture the design deformed reinforcing pipe 9 inexpensively and in large quantities.

The design deformed reinforcing pipe member 13 is pressed by a press machine to perform curling as shown in FIG. This curling is not one time as shown,
Pressing is performed several times from shallow to deep ones.

As described above, when the curling is carried out by pressing several times, as shown in FIG. 9, the upper half is formed into a semi-circular shape, and the lower half has a lateral width longer than the pipe radius by a required width. , V-shape is formed in a shape in which the ends are connected.

Thus, as shown in FIG. 10, the leading edge is subjected to TIG welding 14 to be integrated in strength.

After the TIG welding 14, an extra portion 15 at the front end and an extra portion 16 at the rear end are cut so as to fit along the main pipe 3 at the front end and the pipe 5 at the rear end. Then, finishing is performed.

After the TIG welding 14, the front-end flares 1 open outward as shown in FIG.
0 and rear end flare 11 and then main pipe 3
And extra part 1 at the front end to fit along the standpipe 5
5a and the extra portion 16a at the rear end may be cut and finished.

[0021]

As described above, the present invention makes it possible to manufacture inexpensively a design deformed reinforcing pipe having excellent design properties, and to reinforce a frame with this design deformed reinforcing pipe so as to be firm in strength. It is possible to provide a V-shaped frame for a bicycle that exhibits high rigidity, matches the V-shaped design, increases the commercial value, and can be used satisfactorily.

[Brief description of the drawings]

FIG. 1 is an overall side view of a bicycle V-shaped frame according to the present invention.

FIG. 2 is an enlarged side view of a design modified reinforcing pipe as a main part thereof.

FIG. 3 is a cross-sectional view of a central portion taken along line AA of FIG. 2;

FIG. 4 is a cross-sectional view of the front end taken along the line BB of FIG. 2;

FIG. 5 is a cross-sectional view of the rear end taken along the line CC of FIG. 2;

FIG. 6 is a longitudinal sectional view showing the shapes of a front end and a rear end of the modified deformed reinforcing pipe.

FIG. 7 is a plan view showing a first step of manufacturing a member for a design deformed reinforcing pipe by cutting a flat steel plate in a process of manufacturing a design deformed reinforcing pipe for a V-shaped frame for a bicycle according to the present invention.

FIG. 8 is a cross-sectional view showing one step of a curling step performed next.

FIG. 9 is a cross-sectional view showing a final state of the molding in the curling step.

[FIG. 10] The tip of the member for design deformed reinforcing pipe is TI.
It is a side view which shows the process of performing G welding.

FIG. 11 is a side view showing a state in which a front open end and a rear end of the member for design deformed reinforcing pipe are processed to open outwardly.

FIG. 12 is a side view showing a step of cutting the front end and the rear end subjected to the flaring process into shapes suitable for the corresponding in-pipe and vertical pipe, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 V-shaped frame for bicycles 2 Head pipe 3 Main pipe 4 Hanger lug 5 Standing pipe 6 Chain stay 7 Backhawk 8 End 9 Design deformed reinforcing pipe 10 Front flare 11 Rear flare 12 Flat steel plate 13 Member for deformed reinforcing pipe 14 TIG welding 15 Extra part at front end 15a Extra part at front end 16 Extra part at rear end 16a Extra part at rear end

Claims (5)

[Claims] 1. A main pipe having a head pipe connected to a front end thereof is connected to a vertical pipe via a hanger lug, and a side shape of a front half is provided in a V-shape, and a rear half of the main pipe is chained from a hanger lug behind the pipe. In the V-shaped frame for bicycles, where the stay is connected and the backhawk is connected from the standpipe and the chain stay and the backhawk are connected in a triangular shape by the end, the upper pipe is attached to the main pipe and the upright pipe above the hanger lug. A V-shaped frame for a bicycle, which is formed by welding and welding a deformed reinforcing pipe having a half shape and a lower half shape having different shapes and exhibiting an aesthetic effect. 2. A design deformed reinforcing pipe which is inserted into and welded to a main pipe and a vertical pipe above a hanger lug has an upper half formed in a semi-circular shape and a lower half formed from a pipe radius. The V-shaped frame for a bicycle according to claim 1, wherein a vertical side surface width is a required width, and a tip is integrally connected corresponding to a V-shape. 3. The design deformed reinforcing pipe which is inserted into and welded to the main pipe and the upright pipe above the hanger lug is formed such that a front end portion connected to the main pipe is enlarged outward to have a large diameter and a lower half. The flare is formed outwardly around the center to increase the rib effect and the connecting surface shape, narrowed down to the rear end connected to the opposite vertical pipe, and formed to a small diameter, and the required length of the rear end is curved outward Forming flares,
The V-shaped frame for a bicycle according to claim 1 or 2, wherein the strength is increased, the connecting surface is enlarged, welding such as brazing is facilitated, and an aesthetic effect is provided. 4. A flat steel plate having a required thickness is punched out by a press machine, a member for a design deformed reinforcing pipe is provided, and the member for a design deformed reinforcing pipe is pressed by a press machine to perform curling required times and sequentially from a shallow curve to a deep curve. Proceed to a curve, finally form the upper half into a semi-circular shape, the opposite lower half into a pipe shape with the required side width longer than the pipe radius, the tip of which is connected to correspond to the V shape, Weld the leading edge, unite with strength, and attach the front end to the main pipe,
A method for manufacturing a modified V-shaped frame for a bicycle, wherein a rear end portion of the V-shaped frame is cut so as to fit the pipe. 5. A flat steel plate having a required thickness is punched out by a press machine, a member for a design deformed reinforcing pipe is provided, and the member for the design deformed reinforcing pipe is pressed by a press machine to perform a required number of curlings and sequentially from a shallow curve to a deep curve. Proceed to a curve, finally form the upper half into a semi-circular shape, the opposite lower half into a pipe shape with the required side width longer than the pipe radius, the tip of which is connected to correspond to the V shape, The front edge is welded and integrated in strength, and after welding, the front end and the rear end are flared to open outward, and then the front and rear ends are adapted to the main pipe and the vertical pipe so that they fit. A method for manufacturing a modified reinforcing pipe for a V-shaped frame for a bicycle, characterized by cutting the pipe.