JPH08239080A - Pedal for bicycle, and its manufacture - Google Patents

Abstract

PURPOSE: To provide a pedal for a bicycle where a pedal body made of synthetic resin and a metallic pedal cage are coupled with each other without recourse to fastening by screws. CONSTITUTION: A coupling projection 3 projecting toward a pedal body 2 is made at the contact face with a pedal body 2 of a metallic pedal cage 1, and then the pedal cage 1 is mounted in a pedal body mold die, and next fused synthetic resin is filled up in the mold die, and the coupling projection 3 of the pedal cage is buried and fixed within the pedal body 2, thus a pedal for a bicycle is constituted. Hereby, the pedal body made of synthetic resin and the metallic pedal cage can be integrated without using screws.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle pedal in which a pedal body and a pedal cage are made of different materials.

[0002]

2. Description of the Related Art Bicycle pedals include a bicycle pedal integrally formed of the same material, and a pedal body and pedal cage made of different materials. In the latter case, the pedal body and the pedal cage are manufactured separately and then assembled. That is, a structure and a method are adopted in which a nut is inserted into a pedal body to fix the pedal cage with a screw, or a high frequency is used to press the screw into the pedal body to fix the pedal cage.

[0003]

The above-mentioned conventional structure and method have the following problems. First, in any of the above-described assembly structures and methods, the pedal cage is fixed to the pedal body by tightening using screws. Therefore, there is a possibility that the fastening state of the pedal cage to the pedal body may become unsatisfactory due to loosening of the screws or loosening of the screws due to vibration during use. Secondly, since the pedal body and the pedal cage are made up as separate members, they are assembled and joined and fixed, so that the assembly work is indispensable and not only the cost of the assembly process but also the proper tightening work. If the tightening strength cannot be obtained, defective products may occur, so it is necessary to pay sufficient attention to quality control. Furthermore, the cost of screws and nuts is high, which prevents a reduction in product cost.

[0004]

A bicycle pedal according to the present invention is a pedal formed by combining a synthetic resin pedal body and a metal pedal cage, wherein the pedal cage is provided on a contact surface of the pedal cage with the pedal body. A coupling protrusion protruding toward the body side is formed, and the coupling protrusion is embedded and fixed in the pedal body. It is preferable that a through hole is formed in the pedal cage, and a synthetic resin coating portion is formed on the outer surface of the pedal cage in the vicinity of the through hole by the synthetic resin flowing out through the through hole (claim 2). It is preferable that unevenness is formed at the edge of the coupling protrusion (claim 3).

Claims 4 and below relate to a method of manufacturing the pedal. A fourth aspect of the present invention is a method of manufacturing a pedal in which a synthetic resin body and a metal cage are combined, wherein a part of a contact surface of the pedal cage with the body is bent toward a pedal body at a plurality of locations. After forming the coupling protrusion, the pedal cage is mounted on a pedal body molding die, and then the molding die is filled with molten synthetic resin to integrally form the pedal cage and the pedal body. is there. According to a fifth aspect of the present invention, the molten synthetic resin is caused to flow out of the pedal cage through a through hole formed in the pedal cage by bending the coupling protrusion, and the vicinity of the through hole of the pedal cage is covered with the synthetic resin. Is an unevenness formed on the edge of the coupling protrusion.

[0006]

In the invention of claim 1, since the connecting projection of the pedal cage is embedded and fixed to the pedal body, the pedal cage is securely fixed to the pedal body without depending on the tightening of the screw. According to the second aspect of the present invention, the caulked state is obtained by the synthetic resin coating the outside of the pedal cage, and the coupled state between the pedal cage and the pedal body is strengthened. According to the invention of claim 3, the unevenness of the coupling protrusion enhances the coupling force between the coupling protrusion and the pedal body.

According to the fourth and subsequent aspects of the present invention, the pedal cage having the coupling projections is mounted on the mold, and the pedal body and the pedal cage are integrated when the pedal body is molded. The pedal in which the pedal cage and the pedal body are integrally connected can be obtained. In the invention of claim 5, the pedal cage can be crimped at the same time when the pedal body is molded, and in the invention of claim 6, the pedal body is molded with the concavities and convexities of the coupling projections locked.

[0008]

1 shows a bicycle pedal according to the present invention and a bicycle pedal obtained by the method according to the present invention. Here, connecting projections 3 bent toward the pedal body are formed at a total of four positions corresponding to the legs 2a of the pedal body 2 of the metal pedal cage 1, and these connecting projections 3 are formed. It is embedded and fixed to the leg portion 2a of the. As shown in FIGS. 2 and 3, the coupling projection 3 is formed by punching a predetermined position of the pedal cage 1 in a U shape and bending the punched portion, and the edge portion 3a is processed to be uneven. I am doing it. A through hole 4 is formed in the pedal cage 1 due to the bending of the coupling projection 3, and the synthetic resin of the pedal body 2 flows out of the cage through the through hole 4 and near the through hole 4 of the pedal cage 1. The synthetic resin coating portion 5 is formed.

In this embodiment, the pedal cage 1 and the pedal body 2 are fixed to each other by a coupling projection 3 embedded and fixed to a leg portion 2a of the pedal body 2 and a synthetic resin coating portion 5 in a caulked state. Reference numeral 6 in the figure is a hole for attaching the toe clip formed in the through hole 4. Also, if the reflector housing 10 is formed integrally with the body by enlarging the synthetic resin coating portion, the reflector that is conventionally fixed to the metal pedal cage by a method such as caulking is the same as a synthetic resin integrally molded pedal. Then, the reflector 11 can be fixed by pushing the reflector 11 into the reflector housing 10.

Next, the method of the present invention will be described. At a position corresponding to the leg portion 2a of the pedal body 2 of the metal pedal cage 1, a punching is performed in a U shape and the punching portion is bent toward the pedal body to form a coupling protrusion 3. At this time,
Punching is performed so that the edge portion 3a of the coupling protrusion is uneven. Next, the pedal cage 1 on which the coupling protrusion 3 is formed is mounted on the molding die 8 of the pedal body 2. This mold is provided in the vicinity of the corresponding portion of the through hole 4 so as to allow the molten synthetic resin to flow out of the pedal cage 1 through the through hole 4 formed in the pedal cage 1 by the formation of the coupling projection 3. A shallow recess 9 is formed.

When the mold 8 is filled with molten synthetic resin and cured, the metal pedal cage 1 and the synthetic resin pedal body 2 are integrated. At this time, a part of the molten synthetic resin flows through the through hole 4 of the pedal cage 1 to the outside of the pedal cage and collects in the recess 9 of the molding die 8. Recess 9
Since the pedal cage 1 is sandwiched between the pedal cage 1 and the synthetic resin coating portion 5 formed of the synthetic resin accumulated in the above, a crimped state is obtained. Further, by forming the concave portion 9 into a shape corresponding to the reflector housing 10, the reflector housing 1
0 can be integrally molded with the body 2.

In the above embodiment, the synthetic resin coating 5
Since the staking is formed to obtain the crimped state, the coupled state between the pedal cage 1 and the pedal body 2 becomes strong. In particular, since a large outward force is applied to the pedal cage when the pedal is used, the durability against the outward force is improved in combination with the concave and convex edges formed on the coupling projections 3, and the pedal cage is detached from the pedal body. To be prevented. However, the synthetic resin coating 5 is unnecessary when the bonding force of the bonding protrusion 3 is sufficiently large, and conversely, the concavo-convex of the bonding protrusion is unnecessary when the bonding strength of the synthetic resin coating is sufficiently large. Further, depending on the required design strength, the projections and depressions of the coupling protrusions 3 and the synthetic resin coating portion 5 may not always be necessary. Further, the hole 6 for attaching the toe clip and the reflector housing 10 are not essential.

[0013]

According to the bicycle pedal of the present invention, since the pedal cage and the pedal body are integrally formed, the mounting portion is rattled during use, and the pedal cage is different from the conventional screw-fastened product. There is no danger of coming off,
You get a durable bicycle pedal. Further, according to the configuration in which the synthetic resin coating is formed through the through hole of the pedal cage, the synthetic resin of the pedal body is exposed to the outside of the pedal cage even in the case of a metal pedal cage, so a reflector housing is provided here. As a result, the reflector can be attached by a method similar to that of the synthetic resin pedal without using caulking or the like.

According to the method of the present invention, the pedal cage and the pedal body can be integrated without performing a screwing operation, so that the workability is improved and the absence of the screwing causes the quality of the operator. It is possible to prevent the occurrence of defective products such as screw fixing defects.

[Brief description of drawings]

FIG. 1 is a sectional view of a pedal according to an embodiment of the present invention.

FIG. 2 is a partial front view of the pedal cage before the formation of the coupling protrusion.

FIG. 3 is a partial plan view of a pedal cage in which a coupling protrusion is also formed.

FIG. 4 is a front view of a pedal according to an embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a molding die used to carry out the present invention.

[Explanation of symbols]

 1 Pedal cage 2 Pedal body 3 Coupling protrusion 4 Through hole 5 Synthetic resin coating 10 Reflector housing

Claims (6)

[Claims] 1. In a pedal formed by combining a synthetic resin pedal body and a metal pedal cage, a coupling projection protruding toward the pedal body is formed on a contact surface of the pedal cage with the pedal body, Bicycle pedal characterized in that the coupling protrusion is embedded and fixed in the pedal body. 2. A through hole is formed on the contact surface of the pedal cage with the pedal body, and a synthetic resin coating is formed near the through hole on the outer surface of the pedal cage by the pedal body material flowing out from the through hole. Bicycle pedal according to 1. 3. The bicycle pedal according to claim 1, wherein the coupling protrusion has irregularities formed on an edge thereof. 4. A method of manufacturing a pedal in which a synthetic resin body and a metal cage are connected to each other, wherein a part of a contact surface of the pedal cage with the body is bent toward a pedal body at a plurality of points to form a connection protrusion. After the formation, the pedal cage is mounted on a pedal body molding die, and then the molding die is filled with a molten synthetic resin, and the coupling protrusion of the pedal cage is embedded and fixed in the pedal body. 5. A molten synthetic resin is caused to flow from the through hole of the pedal cage obtained by forming the coupling projection to the outside of the pedal cage, and the vicinity of the through hole on the outer surface of the pedal cage is covered with the synthetic resin. The method for manufacturing a bicycle pedal according to claim 4. 6. The method of manufacturing a bicycle pedal according to claim 4, wherein the connecting protrusion of the pedal cage is formed with unevenness on an edge portion.