JPH023993Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a bicycle crank, and more particularly to a bicycle crank to which a pedal equipped with a toe strap is rotatably attached.

(Prior technology) Conventionally, this type of crank was
As described in Publication No. 57455, it consists of a metal crank body with a crankshaft fitting hole at one end and a pedal shaft attachment hole at the other end, and a synthetic resin covering the outer surface of the crank body. A crank consisting of a cover body made of

By screwing the pedal shaft of the pedal into the mounting hole of the crank body, the bicycle pedal is rotatably mounted to the crank.

Furthermore, the pedal is equipped with a band-shaped toe strap with a fastener at one end, and by fixing the foot placed on the tread to the pedal via the toe strap, the pedal can be operated with force. There is something.

(Problem to be solved by the invention) By the way, when a pedal with a toe strap is attached to a crank whose outer surface is covered with a synthetic resin cover as described above, the toe strap's fastener is metal. Since the cover body is made of synthetic resin, if the tightening tool of the toe strap interferes with the pedal mounting side of the crank body when the pedal is depressed, the The tightening tool of the toe strap came into contact with the cover body, causing scratches on the cover body, and these scratches significantly impaired the appearance of the bicycle crank.

The present invention was devised in view of the above-mentioned problems.The purpose of the present invention is to make the portion of the cover body facing the toe strap have a high surface scratch resistance, thereby preventing the cover body from being scratched. To provide a bicycle crank which can reliably prevent the bicycle from sticking.

(Means for Solving the Problems) The bicycle crank of the present invention is constructed as shown in Figs. It consists of a main body 1 and a synthetic resin cover body 3 that covers the outer surface of the crank main body 1, and is located on the side of the crank main body 1 where the pedal 2 is attached, and on the rotation locus of the toe strap provided on the pedal 2.
It is characterized in that a surface layer 4 having surface scratch resistance is formed so as to be exposed on the surface of the cover body 3.

(Function) If the toe strap fastener interferes with the crank body 1 when the pedal 2 is depressed, the toe strap fastener should be moved to the in contact with the surface layer 4,
This is done to prevent the cover body 3 from being scratched.

(Example) The bicycle crank of the present invention will be described below with reference to the embodiments shown in the drawings.

In the figure, reference numeral 1 denotes a crank body made of metal such as iron or aluminum in the shape of an elongated block, and has a fitting hole 11 for the crankshaft at one end in the length direction.
A lumen 13 with an internal thread 12 continuous with the fitting hole 11 is formed concentrically, and a mounting hole 15 with an internal thread 14 is formed at the other end of the crank body 1. By screwing the pedal shaft 21 into the internal thread 14 of the mounting hole 15, the pedal 2 having a tread surface is rotatably mounted to the crank body 1.

The outer surface of the crank body 1 is covered with a cover body 3 made of synthetic resin.
is integrally formed with the crank body 1 by insert molding.

A band-shaped toe strap 22 with a metal fastener at one end is attached to the pedal 2, and the toe strap 22 fixes the driver's foot on the tread surface, allowing the driver to press the pedal 2 strongly. It's like performing an operation.

In the bicycle crank as described above, the surface layer 4 having surface scratch resistance strength is applied to the rotation locus of the toe strap 22 provided on the pedal 2 on the side of the crank body 1 on which the pedal 2 is attached. It is formed so as to be exposed on the outer surface of the cover body 3.

That is, for example, when the crank body 1 is made of a hard material with high surface scratch resistance such as iron or stainless steel, as shown in FIGS. 1 and 2, the side of the crank body 1 on which the pedal 2 is attached Then, when the toe strap 22 is rotated, the part facing the toe strap 22, that is, the pedal shaft side of the mounting hole 15 in the crank body 1 is bulged outward from the side, and this bulge allows the cover to be closed. The surface layer 4 is formed flush with the outer surface of the body 3.

In the drawings, the surface layer 4 is formed from the rotation locus of the toe strap 22 to the area around the mounting hole 15, so that when the pedal is screwed into the mounting hole 15, the pedal shaft touches the surface of the cover body 3. I try not to come into contact with it.

In this way, when the tightening tool of the toe strap 22 interferes with the crank body 1 when the pedal 2 is depressed, the tightening tool of the toe strap 22 comes into contact with the surface layer 4 of the crank body 1. This is to prevent the cover body 3 from being scratched by the fastening tool of the toe strap 22.

Further, when the crank body 1 is made of a soft material such as aluminum, as shown in FIG. A plate P made of iron, stainless steel, etc. with high surface scratch resistance is integrally provided on the opposing part so as to be flush with the outer surface of the cover body 3, and the outer surface of the plate P 4 to prevent the cover body 3 from being scratched in the same way as in the case described above.

Further, when the crank body 1 is made of an aluminum material or the like, a hard coating treatment such as hard alumite treatment is applied to the portion of the material facing the toe strap 22 to form a surface layer with high surface scratch resistance. 4 may be formed.

Further, the illustrated crank has a circular collar 32 protruding around the outer circumference of the fitting hole 11 in the cover body 3, and this circular collar 32 closes the crank insertion hole of the chain case (not shown). It is done as it should be done.

In addition, in the figure, 31 indicates the inner cavity 1 of the cover body 3.
A holding hole 5 is formed in a portion opposite to 3, and 5 is a cap detachably attached to the holding hole 31.

(Effects of the invention) As explained above, in the bicycle crank of the invention, on the pedal attachment side of the crank body 1, the rotation locus of the toe strap 22 provided on the pedal 2 has a high surface scratch resistance. Since the surface layer 4 is formed so as to be exposed on the surface of the cover body 3, if the tightening tool of the toe strap 22 interferes with the crank body 1 when the pedal 2 is depressed, the toe strap 22 The tow strap 22 is attached to the cover body 3 by bringing a fastener into contact with the surface layer 4 having high surface scratch resistance.
This makes it possible to reliably prevent scratches caused by scratches caused by scratches, and to improve the appearance of the bicycle crank.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a bicycle crank according to the present invention, FIG. 2 is a front sectional view with a pedal attached, and FIG. 3 is a sectional view showing another embodiment. 1...Crank body, 15...Mounting hole, 2...
Pedal, 21... Pedal shaft, 22... Toe strap, 3... Cover body, 4... Surface layer.

Claims (1)

[Scope of utility model registration request] It consists of a metal crank body 1 having a pedal shaft attachment hole 15 at one end in the length direction, and a synthetic resin cover body 3 that covers the outer surface of the crank body 1. A bicycle crank characterized in that a surface layer 4 having surface scratch resistance is formed on the side and at the rotation locus of a toe strap provided on the pedal 2 so as to be exposed on the surface of the cover body 3. .