JP2627860B2 - Bicycle lugs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lug for a bicycle.

[0002]

2. Description of the Related Art Bicycle lugs are joined to a frame pipe by an inner lug method, an outer lug method, or the like.
Alternatively, there is known an internal / external screw method in which a separate inner lug is screwed into the outer lug and then the frame / pipe is joined. These lugs do not pose any particular problem when manufacturing bicycles of uniform shape, but in so-called bespoke bicycles that change the way the frame is assembled according to the individual's physique, the following steps are required to assemble the frame pipe. There was such a problem.

That is, in order to change the physique of an individual, for example, to construct a frame in accordance with the physical characteristics of the individual such as long legs and long hands, it is necessary to change the length of the frame pipe. By changing the length of the frame pipe,
Inevitably, the shape of the triangle forming the frame changes, and the angle of the triangle also changes. Accordingly, the angle of the joint (hereinafter, simply referred to as a joint) between the bicycle lug (hereinafter, simply referred to as a lug) and the frame pipe protruding from the head lug also changes.

As one of the countermeasures, it is conceivable to make several types of lugs in which the angle between the head lug and the joint is changed, and to use a lug having an optimum frame configuration for the individual as necessary. . But with this method,
A mold was required for each of several types of lugs having different angles, and the production of several expensive molds resulted in extremely high costs, which was not a commercially viable method.

Therefore, the thickness of the pipe-shaped joint is designed to be slightly thicker, and when it is necessary to adjust the angle, the joint is cut to a required angle. A method for obtaining a desired angle is conceivable. However, in the inner lug method, as shown in FIG. 4, since the thickness of the pipe-shaped cylindrical portion 24 is uniform, the joining portion 2
If cutting is performed so that the angle 3 is different from the angle protruding from the head lug 22, a thin portion A is formed on the base 26 side of the cylindrical portion 24. In particular, when the cutting angle is large, the thin portion A becomes very weak in strength, and the cylindrical portion 24 may be broken from this portion. Further, the step 25
In this case, the connection between the frame pipe 27 and the base 26 is not smooth, and there is a difference between the frame pipe 27 and the base 26 due to the thin portion A, which has a disadvantage that the appearance is unsightly. Was.

Also, in the outer lug method, as shown in FIG. 5, since the thickness of the cylindrical portion 34 in the shape of a pipe is uniform, the angle of the joint portion 33 is different from the angle protruding from the head lug 32. When the cutting is performed, a thin portion A is formed on the head lug 32 side of the cylindrical portion 34. When the cutting angle is large, the thin portion A becomes very weak in strength, and there is a possibility that the cylindrical portion 34 is broken from this portion. Further, a gap B may be formed between the frame pipe 37 and the cylindrical portion 34 in the step portion 35, and there is a disadvantage that the external appearance is uncertain.

In the inner lug method and the outer lug method as described above, the cylindrical portions 24 and 34 and the frame pipes 27 and 37 are used.
It is necessary to increase the amount of bonding between the cylindrical portions 24 and 34.
Had to be formed longer. Therefore,
There is a disadvantage that the thin portion A and the gap B are easily formed as described above. In order to solve these problems, the joint 2
Increasing the thickness of the cylindrical portions 24, 34 constituting the third, 33 has the disadvantage that the weight of the lugs 21, 31 themselves increases.

Therefore, if the inner and outer screw methods are adopted as shown in FIG. 6, both the inside and the outside of the frame pipe 47 can be adhered, and the bonding margin can be increased. It can be shortened, and it is harder to form a thin part than the inner lug method or the outer lug method. However, since the base 46 for screwing the separate inner lug 44 is required, there has been a problem that the base 46 becomes large and the weight increases, and the structure becomes complicated and manufacturing is difficult. Further, when this is cut, the inner lug 44 is not as good as the inner lug method or the outer lug method.
The thin part is formed in the
A gap was sometimes formed between the pipe 47 and the base 46.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a frame structure according to an individual's physical characteristics by changing the length of a frame pipe to achieve a head structure.
Even if the angle of the joint between the lug and the frame pipe that protrudes from the lug changes, it can be dealt with simply by cutting the part to the required angle. An object of the present invention is to provide a bicycle lug that does not easily break or has a step or a gap between the frame and the pipe at a step portion, thereby preventing the appearance of the lug. Further, a lug having the above characteristics is manufactured with a small number of molds, and is provided at low cost.

[0010]

According to the present invention, in order to solve the above-mentioned problem, a joint 3 of a bicycle lug 1 with a frame pipe is formed by a cylindrical portion 4 having a diameter larger than the inner diameter of the frame pipe. A base portion 6 having an outer diameter larger than the cylindrical portion 4, and a step portion 5 connecting the cylindrical portion 4 and the base portion 6,
The inside of the cylindrical portion 4 is formed in a mortar shape 8 whose inner diameter gradually decreases as it goes deeper, and a joining hole 9 for inserting the frame pipe from the step portion 5 toward the base 6.
At the same time as cutting the cylindrical portion 4 so as to match the inner diameter of the frame pipe.

[0011]

The present invention is constructed as described above.
Can be formed at an angle that is significantly different from the original angle formed by the head lug 2 and the joint 3. And since the inside of the cylindrical part 4 of the lug 1 is formed in a mortar shape 8, even if the joint hole 9 is drilled at an angle greatly different from the original angle formed by the head lug 2 and the joint part 3, Since the thin portion is not formed on the base 6 side of the cylindrical portion 4, the cylindrical portion 4 is not broken. Further, even if a thin portion A is formed at the end 10 of the cylindrical portion 4 on the opposite side to the base 6, since a large force is not applied to this portion unlike the base 6, the cylindrical portion 4 may be broken by the thin portion. There is nothing.

The amount of adhesion to the frame and pipe is the cylindrical portion 4
And the connection hole 9, that is, the inside and outside of the frame pipe, can be obtained, so that the length of the cylindrical portion 4 can be shortened, which leads to a reduction in the weight of the lug. Furthermore, since the joining hole 9 can be formed at a desired angle from the step portion 5, when the frame pipe is inserted, a step or a gap is formed between the frame pipe and the step portion 5, so that the appearance becomes irregular. Nothing is going to happen.

[0013]

FIG. 1 shows a lug 1 embodying the present invention, in which a joint 3 projects from a head lug 2. The projecting joint portion 3 is composed of a cylindrical portion 4 having a larger diameter than the inner diameter of the frame pipe, a base portion 6 having an outer diameter larger than the cylindrical portion 4, and a step portion 5 connecting the cylindrical portion 4 and the base portion 6. I have. Cylindrical part 4
Has a mortar shape 8 whose inner diameter gradually decreases toward the back. At this stage, the joining hole 9 has not been formed yet. In order to form the joint 3 of the lug 1 at an angle corresponding to the physical characteristics of the ordered individual, a joint hole 9 for inserting a frame pipe from the step 5 toward the base 6 is formed. At the same time, by cutting the outer surface of the cylindrical portion 4 having a larger diameter than the inner diameter of the frame pipe so as to match the inner diameter of the frame pipe, the frame pipe is connected to the cylindrical portion 4 and the joint hole 9. It will be able to be inserted into.

FIGS. 2 and 3 show the lug 1 of FIG. 1 after being drilled at an angle according to the physical characteristics of the individual receiving the order. As can be seen from this figure, even if the joining hole 9 is drilled at an angle significantly different from the original angle formed by the head lug 2 and the joining portion 3, the inside of the cylindrical portion 4 of the lug 1 has a mortar shape 8.
Therefore, no thin portion is formed on the base portion 6 side of the cylindrical portion 4. Also, the entire outer surface of the cylindrical portion 4 and the joint hole 9
Can be used as a bonding margin with the frame pipe. Furthermore, no matter how the joint hole 9 is opened, the existing hole is not expanded unlike the conventional inner lug method, outer lug method, or internal / external screw method.
There is no step or gap between the pipe and the step 5.

[0015]

According to the present invention, if one lug is formed, the joint hole 9 can be formed at an angle that is significantly different from the original angle formed by the head lug 2 and the joint 3. Therefore, it is not necessary to make a lot of lugs, so that the cost of the mold is small and the lugs can be provided at low cost. Further, since the inside of the cylindrical portion 4 of the lug 1 is formed in a mortar shape 8, even if the joint hole 9 is formed at an angle greatly different from the original angle formed by the head lug 2 and the joint portion 3, There is no thin portion on the base 6 side of the cylindrical portion 4 and the cylindrical portion 4 does not break.

The cost of bonding to the frame and pipe is
Therefore, the length of the cylindrical portion 4 can be reduced, and the weight of the lug 1 can be reduced. Further, a step or a gap is not formed between the frame pipe and the step portion 5, and the appearance is improved.

[Brief description of the drawings]

FIG. 1 is a side view of a lug before drilling a joint hole embodying the present invention.

FIG. 2 is a side view of the lug after forming a joint hole embodying the present invention.

FIG. 3 is a side view of the lug after forming a joint hole embodying the present invention.

FIG. 4 is a side view of a lug of a conventional inner lug type.

FIG. 5 is a side view of a conventional outer lug type lug.

FIG. 6 is a side view of a conventional lug of an internal / external screw type.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Lug 2 Head lug 3 Joining part 4 Cylindrical part 5 Step part 6 Base 8 Mortar 9 Joining hole 10 End part 21 Lug 22 Head lug 23 Joining part 24 Cylindrical part 25 Step part 26 Base 27 Frame pipe 31 Lug 32 Head / Lug 33 Joint 34 Cylindrical 35 Step 37 Frame / Pipe 41 Lug 42 Head / Lug 43 Joint 44 Cylindrical 45 Step 46 Base 47 Frame / Pipe A Thin section B Gap

Claims (1)

(57) [Claims] 1. A joint portion of a bicycle lug with a frame pipe is formed by forming a cylindrical portion having a larger diameter than the inner diameter of the frame pipe, a base having an outer diameter larger than the cylindrical portion, and the cylindrical portion and the base. A stepped portion to be connected, and the inside of the cylindrical portion is formed in a mortar shape in which the inner diameter gradually decreases toward the back, and a joining hole for inserting the frame pipe from the stepped portion toward the base portion is formed. A bicycle lug, wherein the cylindrical portion is cut to match the inner diameter of the frame pipe while being drilled.