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Bicycle pedal crank, intermediate product and method for manufactoring such a pedal crank

A bicycle and crank arm technology, applied in the field of bicycle crank arms, can solve problems such as wasting time

Inactive Publication Date: 2007-09-05
CAMPAGNOLO SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This disadvantage is related to the fact that the winding of the crank arm body with layers of woven structural fibers should be done manually, resulting in a significant waste of time

Method used

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  • Bicycle pedal crank, intermediate product and method for manufactoring such a pedal crank
  • Bicycle pedal crank, intermediate product and method for manufactoring such a pedal crank
  • Bicycle pedal crank, intermediate product and method for manufactoring such a pedal crank

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Embodiment Construction

[0111] Referring to FIG. 1 , the bicycle crank arm according to the present invention, especially the left crank arm is indicated by 1 as a whole.

[0112] The crank arm 1 comprises an elongated body 2 extending along a longitudinal axis X-X and having a first end 5 comprising a first base 38 for coupling to a bicycle bottom bracket assembly (not shown), including a first base 38 for coupling to a pedal A second end 10 of a second base 39 (not shown), and an intermediate portion 15 extending between the ends 5 , 10 . On the crank arm 1 , a front surface 91 is defined which faces outwards when fitted to a bicycle, and a rear surface 93 which faces towards the bicycle frame when fitted to a bicycle.

[0113] The elongated body 2 is made in a single piece of composite material comprising structural fibers incorporated in a polymeric material. Typically, the structural fibers are selected from the group consisting of carbon fibers, glass fibers, aramid fibers, ceramic fibers, bor...

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Abstract

A bicycle pedal crank is described, comprising an elongated body extending along a longitudinal axis X-X and having a first end portion comprising a first seat for coupling with a bottom bracket of the bicycle, a second end portion comprising a second seat for coupling with a pedal and an intermediate portion extending between said first end portion and said second end portion and comprising an inner portion substantially without structural strength and a first reinforcement structure. In accordance with the invention, the first reinforcement structure comprises a tubular structure arranged around said inner portion and extending longitudinally for a part not longer than the longitudinal extension of said intermediate portion. Such a tubular structure, advantageously, ensures uniform structural capabilities around the portion substantially without structural capability. The extension of the tubular element is limited to just the intermediate portion of the pedal crank, that is without involving the end portions and the respective coupling seats, allows the pedal crank to be manufactured in a simple and quick way in a completely automated manner.

Description

technical field [0001] The invention relates to a bicycle crank arm. [0002] The invention also relates to an intermediate product for the manufacture of such a crank arm and a method for the manufacture of said crank arm. Background technique [0003] Manufacturers of bicycles and / or bicycle components, especially racing bicycles, are always seeking to reduce the overall weight of the bicycle, and thus the weight of the various bicycle components, while ensuring, if not even improving, the structural strength properties of such components. [0004] In order to meet this requirement, bicycle components, especially crank arms, have been developed using composite materials comprising unidirectional continuous structural fibers, or fibers in the form of sheets or small sheets, randomly arranged and bonded in a polymeric material . The structural fibers, in fact, substantially contribute to the structural strength of the crank arm. [0005] Patent application US2005 / 0012298A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62M3/00B29C70/00G05G1/30
CPCB62M3/00Y10T74/2164F16C3/22
Inventor 加布里埃莱·恰瓦塔毛里·费尔特林
Owner CAMPAGNOLO SRL
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