Adjustable Bicycle Suspension System April 5, 2022 Inventor: D'Arcy O'Connor Assignee: D'Arcy O'Connor and Ursa Bikes Abstract: A bicycle rear wheel suspension system includes an upper link and a lower link both pivotally attached to the frame and to a rear stay member. An instantaneous center of rotation of the rear stay member is defined at an intersection between an upper axis extending through first and second pivots of the upper link and a lower axis extending through third and fourth pivots of the lower link. The attachment point of the lower link onto the front triangle dictates whether the rear suspension is a "high pivot" or a "low pivot" suspension. A high pivot suspension requires the use of an idler pulley above the crankset chainring, which the tension side of the drive chain routes over top of the pulley and then around the crankset chainring to towards the rear of the bike. A "low pivot" suspension does not require a pulley since the rearward wheel trajectory is predominantly vertical or slightly forward of vertical, and thus does not pull on the chain enough to require an idler pulley. This suspension accommodates for both a "high pivot" suspension design layout that utilizes an idler pulley as well as a "low pivot" suspension design which does not require an idler pulley on the same frame. Such an adjustable suspension would allow for a bike to transform between a suspension layout that would be ideal for Downhill Mountain Bike riding and a suspension layout that is better suited for more level-ground riding. Claims: The invention as claimed is: 1. Claim 1 - A bicycle frame set comprising: a main frame including at least a seat tube, a top tube, a head tube, a down tube, and a bottom bracket; and a rear wheel suspension system pivotally attached to the main frame, the rear wheel suspension system comprising: an upper link pivotally attached to the main frame at a first pivot point; a rear stay member having an upper end pivotally attached to the upper link at a second pivot point and a lower end having a dropout receiving a rear wheel axle of the bicycle, the rear wheel axle defining an axle axis about which the rear wheel rotates when mounted to the dropout; a lower link pivotally attached to the main frame at a third pivot point, called the Main Pivot ("MP"), located on said main frame at a lower vertical elevation than the first-pivot point, and the lower link being pivotally attached to the rear stay member at a fourth pivot point located on said rear stay member below said upper end thereof; and a shock absorber having a first end pivotally connected to the upper link and a second end pivotally connected to the main frame; wherein an instantaneous center of rotation is defined at an intersection between an upper axis extending through the first and second pivots and a lower axis extending through the third and fourth pivots. Said intersection, or ICR, translates as the rear wheel compresses. 1 Date Recue/Date Received 2022-04-20


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    Title :

    ADJUSTABLE BICYCLE SUSPENSION SYSTEM


    Additional title:

    SYSTEME DE SUSPENSION DE VELO AJUSTABLE


    Contributors:

    Publication date :

    2023-10-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B62K Fahrräder , CYCLES



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