JP2000158901A - Stepped spoke for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the twisting of a spoke wire in nipple connection of a stepped spoke by providing a flat part catchable by a spanner on the other end-side major diameter part for screwing the nipple of the stepped spoke. SOLUTION: A stepped spoke 1 comprises a head part 4 to be locked with a hub A through a neck bent part 3 on one end of a spoke wire 2 having major diameter in both ends and a small diameter in the middle, a screw part 5 on the other end, to which a nipple 6 for keeping it within the inner surface of a rim B is screw connected, and a flat part 7 near the other end. The flat part 7 is formed by crushing a part of the major diameter part by a press machine, and set to a size capable of inserting the spoke wire insert hole of the hub A, and two parallel planes of the flat part 7 are set vertical in the state where the head 4 is turned up. The nipple 6 is fastened in the state where a spanner is caught on the flat part 7 to prevent rotation of the other end-side major diameter part. According to this, the transfer of the rotating force of the nipple 6 to the middle part of the spoke wire 2 is resolved to prevent the twisting of the spoke wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stepped spoke of a bicycle.

[0002]

2. Description of the Related Art Stepped spokes are used in competitive bicycles and the like in which a middle portion of the spoke wire is made thin to reduce the weight. At one end of the spoke, a head is formed through a neck bending part. The strength of the head to be locked to the hub is about the strength of the straight part due to neck bending and the direction in which the impact force is applied during use. It falls to 70% or less. Therefore, in the stepped spoke, one end of the spoke wire has a large diameter (standard size) to maintain the required strength of the head, and the other end also has a large diameter (standard size) to obtain the required strength after threading. .

[0003]

In order to further reduce the weight of the bicycle, the stepped spoke tends to make the intermediate portion very narrow as long as the required strength is not impaired. When the nipple is screwed in, the middle part is twisted. When used with the twist remaining, fatigue is promoted and the life of the spoke is shortened, but it is extremely difficult to assemble without causing twist.
Further, even if the spoke wire is twisted, it is hardly distinguished from the appearance, and it is not easy to remove the generated twist.

[0004] Therefore, an object of the present invention is to make it possible to reliably prevent the spoke wire from being twisted when the nipple is connected to the stepped spoke.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a flat portion which can be hooked with a wrench is provided on the large-diameter portion on the other end side of the stepped spoke where the nipple is screwed. .

The flat portion has a fixed relationship between the orientation of the two opposing planes and the position of the head. In particular, when the head is in the upward state, the two parallel planes of the flat portion are oriented horizontally or vertically. Are preferred.

[0007]

The nipple is tightened in this state by applying a spanner to the flat portion to prevent the other end of the spoke wire from rotating at the large diameter.
In this case, the rotational force is not transmitted to the middle portion of the spoke wire, and the middle portion can be prevented from being twisted.

If the spanner is not fixed securely, the spoke wire may be slightly twisted due to the rotation of the spanner, but the relationship between the position of the spoke head and the direction of the flat portion is constant. When the spoke wire is twisted, the above-mentioned fixed relationship is broken, so that the occurrence of twist can be detected by collation based on the head, and the twist can be easily corrected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a stepped spoke 1 according to the present invention has a large diameter (standard spoke diameter) at one end and the other end, and a small diameter at an intermediate portion. A head 4 for locking to the hub A is provided via the neck bending portion 3, a nipple 6 to be retained on the inner surface of the rim B is screwed to a screw portion 5 at the other end, and a flattened end is provided at the other end of the spoke wire 2. Part 7
Is provided.

[0010] The flat portion 7 is formed by crushing a part of the large diameter portion of the spoke wire 2 by a press machine, and has a size that can pass through the spoke wire insertion hole of the hub A.

In addition, the flat portion 7 is, here, a head 4
In the state of FIG.
a and 7a are oriented vertically.

[0012] The stepped spoke 1 of the drawing configured as described above.
The other end is passed through the spoke wire insertion hole of the hub A shown in FIG. 1 and further passed through the hole of the rim B to lock the head 4 to the hub A as shown in FIG. Thereafter, the nipple 6 is lightly screwed into the screw portion 5, and as shown in FIG.
And the other end of the large-diameter portion is prevented from rotating by the spanner C. In this state, the nipple 6 is tightened using the driver D. Therefore, the rotational force of the nipple 6 is not transmitted to the intermediate portion of the spoke wire 2, and the spoke wire is prevented from being twisted.

If a slight twist occurs,
Since the direction of the flat portion 7 changes as shown by the dashed line in FIG. 2 and the positional relationship with the head 4 changes, the torsion can be visually confirmed and corrected by visual observation.

[0014]

As described above, in the stepped spoke of the present invention, the flat portion which can be wrenched is provided at the large diameter portion on the other end side of the spoke wire. It is possible to assemble without causing any adverse effects (such as deterioration of quality and shortened life of spoke wires) due to residual twist.

In the case where the relationship between the position of the head and the direction of the flat portion is fixed, the twist can be visually confirmed and corrected based on the deviation of the relationship between the two, and even a slight twist can be eliminated.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a stepped spoke of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of a state where a spanner is hung on a flat portion.

[Explanation of symbols]

 1 Stepped Spoke 2 Spoke Wire 3 Neck Bend 4 Head 5 Screw 6 Nipple 7 Flatbed 7a Flatbed Flat A Hub B Rim C Spanner D Driver

Claims (2)

[Claims] 1. A step formed by forming a head portion at one end of a spoke wire having a large diameter at one end and the other end and a small diameter at an intermediate portion via a neck bending portion, and screwing a nipple to the other end. A stepped spoke for a bicycle, wherein a flat portion that can be hooked with a spanner is provided at a large diameter portion on the other end side of the spoke wire. 2. The stepped spoke of a bicycle according to claim 1, wherein the relationship between the direction of the flat portion and the position of the head is constant.