Patent ID: 9005060
Filing Date: 2015-04-14
Classification: B62K,B62M

Abstract:
1. A derailleur for moving a chain to different sized sprockets arranged between a range of sizes increasing from smallest to largest in a sprocket nest, the derailleur comprises: an angled pivot guide feed arm for directing the chain onto one of multiple sprockets within the sprocket nest, wherein the angled pivot guide feed arm is rotatably mounted over pivot end on a single angular pivot pin fixed on an inclined surface attached to a frame, the inclined surface being oriented at an angle equal to a tangent slope of the sprocket nest as measured by a straight line formed between the largest sprocket and the smallest sprocket and when the angled pivot guide feed arm pivot end rotates about the pivot pin, an opposite upper chain guide end of the angled pivot guide feed arm supports a chain guide roller and traces a fixed planar arcuate path along a sweep angle set and controlled by the rotation about said singular angular pivot pin; a chain slack take-up idler arm having a pair of take-up frame sides, the chain slack take-up idler arm for chain slack take-up being pivotally connected to the upper chain guide end of the angled pivot guide feed arm and extending to a chain take up roller at a bottom opposite end of the chain slack take up idler arm, both the chain guide roller and the chain take-up rollers being held between the take-up frame sides of the chain slack take-up idler arm; and, wherein the angled guide feed arm and the pivotally connected chain slack take-up idler arm use the chain guide roller at the upper end to both direct the chain onto one of the sprockets and to take up chain slack at the chain slack idler arm, when the chain slack take-up idler arm is moved centered on a middle sprocket the chain guide roller and the chain take up roller are both aligned parallel and in the same plane with the middle sprocket of the sprocket nest wherein the chain slack take-up idler arm when moved from alignment with the middle sprocket is canted on an angle at either extremes of the smallest and largest sprockets wherein the chain guide roller and chain take-up roller are not aligned parallel and in the same plane relative to the respective smallest or largest sprocket creating a twist in the chain which is straightened out by a movement of the guide roller and chain take-up roller by utilizing a gap or clearance between the take-up frame sides of the chain slack idler arm.