Patent ID: 8479553
Filing Date: 2013-07-09
Classification: B21D

Abstract:
1. A method for fabricating wings of bicycle pedals, comprising the steps of: stamping a plate to form a preformed body which includes an opening and a body surrounding the opening that contains a preset working surface, the working surface including a preset force receiving zone adjacent to the opening, the body further containing a first expanded portion, a second expanded portion and two arched portions bridging two sides of the first and second expanded portions respectively, wherein the first expanded portion, second expanded portion and two arched portions are on a same horizontal plane; applying a punching force to the force receiving zone to bend the first expanded portion, the second expanded portion and the arched portions such that the working surface on the first and second expanded portions to be opposite each other and the working surface on the arched portions are formed in curved surfaces opposing each other; and bending the arched portions to form vaulted portions, wherein each of the vaulted portions containing a first sloped section connecting to the first expanded portion, a second sloped section connecting to the second expanded portion and a straight section bridging the first sloped section and the second sloped section.