JP2528932Y2 - Bicycle brake lever - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle brake lever integrally formed of a synthetic resin by inserting a metal insert.

[0002]

2. Description of the Related Art In recent years, bicycle brake levers made of synthetic resin have been manufactured in order to reduce the weight and enhance the appearance.

[0003] Brake levers made of synthetic resin have a large degree of freedom in shape and color, and are superior in softness to the touch as compared with metal brake levers, but have the problem that strength is lower than that of metal brake levers. To this end, after a hollow brake lever is molded with a resin, a reinforcing metal is inserted into the cavity, or a synthetic resin brake lever is integrally molded using a metal insert.

[0004]

However, the former brake lever has poor adhesion between the reinforcing metal and the outer resin, and both the former and the latter have a metal wire where the tip of the brake wire is fitted and connected. Therefore, if the metal portion is corroded during use, the sliding between the wire tip and the metal fitting portion becomes extremely poor. For this reason, when rotating the brake lever, bending stress is repeatedly generated in the brake wire,
There is a problem that the brake wire is easily broken by long-term use.

For this reason, the distal end of the brake wire is connected to the hole of the brake lever via a link member. However, this method requires a separate link member and increases the number of parts and the number of assembly steps. However, there is a problem that the manufacturing cost is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a good sliding of a locking hole for locking a tip end portion of a brake wire, a bending stress applied to a brake wire can be reduced, and a relatively small amount of bending stress is applied to the brake wire. It is an object of the present invention to provide a bicycle brake lever that can be manufactured at low cost.

[0007]

For this purpose, the bicycle brake lever of the present invention is formed integrally with a synthetic resin by inserting a metal insert, and has a locking hole for locking the tip of the brake wire. In a bicycle brake lever, a main body insert is disposed over substantially the entire length of the brake lever in a longitudinal direction, and an auxiliary insert is disposed around a locking hole in which a distal end of a brake wire is locked. The engagement hole is fixed by using a projection and a recess, and the inner peripheral surface of the locking hole is completely covered with a synthetic resin.

[0008]

The brake lever has its base portion inserted into a bracket having a predetermined shape, and a shaft supported by the bracket is inserted into a hole provided in the base portion so as to be swingably mounted. Then, the distal end of the brake wire is inserted and locked in the locking hole provided in the base of the brake lever.

When the brake is operated, the brake lever swings around the axis of its base to pull the brake wire. However, since the inner peripheral surface of the locking hole that holds the tip of the brake wire is covered with resin, it does not corrode like metal, and between the tip of the brake wire and the locking hole for a long time. Good sliding can be ensured. Therefore, even if the brake wire is used for a long time, a large bending stress is not applied to the brake wire, and breakage of the brake wire can be prevented.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a brake lever device, and FIG. 2 is a sectional view thereof. 10 is a brake lever, 2 is a bracket for supporting the brake lever 10,
Reference numeral 3 denotes a mounting band for mounting the bracket 2 to the handle. The outside of the bracket 2 and the mounting band 3 is covered with a cover 6 made of synthetic resin.

The bracket 2 is formed by bending a metal plate into a substantially U-shape, has a front surface and side surfaces following both sides thereof, and has a shape in which an upper portion, a rear portion, and a bottom portion are opened. A shaft 4 is horizontally supported on both side surfaces, and the shaft 4
The brake lever 10 is pivotally supported so as to swing.

A part of the front surface of the bracket 2 is bent inward to form a tightening washer 5, and a tightening screw 9 is inserted through the tightening washer 5 from below.

On the other hand, a screw hole member 3a having a screw hole is attached to the lower portion of the attachment band 3 so as to be fitted into the long holes on both sides. Then, the tip of the tightening screw 9 is screwed into the screw hole member 3a, and the mounting band 3 is mounted on the bracket 2.

Further, an adjusting screw 8 for adjusting the swing range of the brake lever 10 is provided on the front surface of the bracket 2.
Is screwed in, and a cutout hole 2a for locking the outer portion of the brake wire 7 and inserting the tip portion is provided below the screw hole.

As shown in FIGS. 3 and 4, the brake lever 10 is integrally formed of synthetic resin using a metal insert including a main body insert 11 and an auxiliary insert 12.

That is, as shown in FIGS. 5 and 6, the main body insert 11 is formed by punching a steel plate into a slightly smaller side shape of the brake lever, and the shaft 4 is inserted into the upper portion of the base. A shaft hole 11a is formed, and a holding hole 11b for holding an insert during molding is provided below the shaft hole 11a. Furthermore, in order to fit and fix the auxiliary insert 12, a fitting convex portion 11c and a fitting concave portion 11d on the opposite side are formed at the base of the main body insert 11.

On the other hand, the auxiliary insert 12 is formed by stamping into a shape substantially conforming to the shape of the base of the main body insert 11, and projects downward to reinforce the periphery of the locking hole at the base of the brake lever 10. Is provided with a notch hole 12a. Further, fitting protrusions 12c and fitting recesses 12d are provided on both sides of the auxiliary insert 12 at positions corresponding to the fitting protrusions 11c and the fitting recesses 11d. These fitting projections and fitting recesses can be easily formed by press working when punching a steel plate.

Therefore, at the time of manufacture, the body insert 11
The auxiliary insert 12 is fitted to one side of the base of the
By press-fitting the fitting recess 1d with the fitting recess 12d, a metal insert for the brake lever 10 can be easily manufactured with fewer processing steps than welding or the like.

In this embodiment, the right brake lever is illustrated and described. The left brake lever is formed symmetrically to the right and left, and in the left insert, when the auxiliary insert 12 is the right. On the other side, Figure 5
Is fixed to the back side of. However, since the fitting concave portion 11d is formed on the back surface side of the main body insert 11 in FIG. 5, the same auxiliary insert 12 can be fixed on the back surface side, and the left and right insert parts can be shared.

The metal insert thus formed is:
The insert is inserted into the cavity of the mold, and a pin for holding the insert is inserted into the shaft hole 11a and the holding hole 11b to hold the insert, and the synthetic resin material is injected into the cavity to perform injection molding.

At the time of molding, the notch hole 12 of the auxiliary insert 12
a is formed so as to cover the metal portion with a resin, and a locking hole 13 at the tip of the brake wire is formed.
A slit 14 for inserting a wire is formed from the lower part to the front.

In the brake lever device constructed as described above, the handle 16 is inserted into the mounting belt 3, and the tightening screw 9 in the bracket 2 is turned. The mounting band 3 having the screw hole member 3a is drawn into the bracket 2, and the handle 16
Is strongly in contact with the upper part of the bracket 2, and the bracket 2 is fixedly fastened to the handle 16.

The tip 7a of the brake wire 7
Is inserted into the locking hole 13 provided at the base of the brake lever 10 through the slit 14 and locked.

At the time of braking operation, the brake lever 10
It swings around the shaft 4 of the base part and acts so as to pull the brake wire 7 (inner wire). However, since the inner peripheral surface of the locking hole 13 in which the brake wire tip 7a is held is covered with resin, it does not corrode like metal,
Good sliding can be ensured between the brake wire tip 7a and the locking hole 13 for a long time. For this reason, even if the brake wire 7 is used for a long time, a large bending stress is not applied to the brake wire 7, and breakage of the brake wire can be prevented.

[0026]

As described above, according to the bicycle brake lever of the present invention, the main body insert is disposed over substantially the entire length of the brake lever in the longitudinal direction, and the locking hole in which the tip end of the brake wire is locked. Auxiliary inserts are arranged around the periphery, and the inner peripheral surface of the locking hole is completely covered with synthetic resin.Therefore, metal corrosion does not occur on the inner surface of the locking hole, and the brake wire tip and the Between the locking holes,
Good sliding can be ensured and even if used for a long time,
No large bending stress is applied to the brake wire,
Breakage of the brake wire can be prevented.

Further, since the auxiliary insert is fitted and fixed to the side of the main body insert by using the projection and the concave portion, the insert part can be shared by the left and right brake levers, and the process of increasing the number of steps such as welding becomes unnecessary. Therefore, the manufacturing cost can be reduced and the manufacturing can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a perspective view of a brake lever device.

FIG. 2 is a sectional view of the brake lever device.

FIG. 3 is a front view of the brake lever 10;

FIG. 4 is a bottom view of the brake lever.

FIG. 5 is a front view of the metal insert.

FIG. 6 is a bottom view of the insert.

[Explanation of symbols]

2-bracket, 3-mounting band, 4-axis, 7-brake wire, 10-brake lever, 11-body insert, 12-auxiliary insert, 13-locking hole.

Claims (1)

(57) [Scope of request for utility model registration] 1. A bicycle brake lever having a locking hole, into which a metal insert is inserted and integrally molded of synthetic resin, to which a tip end of a brake wire is locked, wherein a main body insert extends over substantially the entire length of the brake lever in the longitudinal direction. The auxiliary insert is disposed around a locking hole in which the distal end portion of the brake wire is locked, and the auxiliary insert is fitted and fixed to a side portion of the main body insert using a projection and a concave portion. A brake lever for a bicycle, wherein the inner peripheral surface of the hole is completely covered with a synthetic resin.