Patent ID: 6761847
Filing Date: 2004-07-13
Classification: B29C,B29L,B60B,Y10T

Abstract:
A method for producing a bicycle wheel rim of the type presenting an inner peripheral wall, an outer peripheral wall, two lateral walls joining said peripheral walls, and two circumferential wings, for anchoring a tyre, which extend outwards from the two sides of the outer peripheral wall,wherein said method comprises the following steps: a. applying on an inner part of a mould a predetermined number of layers of structural fibre fabric incorporated in a plastic material matrix sufficient to form an inner wall, an outer wall, two lateral walls and wings; b. arranging an inflatable bag on the layers between the lateral walls; c. folding a first selected number of the predetermined layers on the inflatable bag, leasing the remaining predetermined number of layers free; d. applying a core over the folded layers; e. folding the remaining predetermined number of the layers over the core; f. applying an outer part of the mould to enclose the layers; g. inflating the inflatable bag to press the layers against the mould; h. increasing the temperature of the mould to a value sufficient to cause reticulation of the plastic material matrix; and i. removing the core from the product of step h, to obtain a bicycle wheel rim formed of a single piece of structural fibre material.