Bicycle Derailleur Mounting Device with Alignment Indicator

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Solution Overview

Problem

Users face difficulty in determining the optimal position for mounting a bicycle front derailleur relative to the chain's running direction, as the optimal position is manufacturer-specific and not easily identifiable by the user.

Innovation Solution

A mounting device with an adjustable mounting portion around the bicycle frame's bottom bracket and an indicator that aligns with the chain line, allowing for precise adjustment of the front derailleur's orientation using directional marks and slots for alignment with the chain's running direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the front derailleur is mounted at a predetermined optimal position, then chain movement efficiency is improved, but the user cannot easily determine this position

Engineering Contradiction:

Improvechain movement efficiencyVSAvoiduser ability to determine optimal position

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies preliminary action by pre-configuring the mounting device with indicators and directional marks that show the optimal mounting position before the user completes the installation. The indicator aligns with the chain line to preliminarily establish the correct orientation, eliminating the need for the user to calculate or determine the optimal position independently.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses an indicator as an intermediary element between the mounting device and the chain line. This indicator serves as a mediator that translates the complex geometric relationship between the derailleur and chain into a simple visual alignment task for the user, making the optimal position determination straightforward.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the mounting device includes adjustment mechanisms, then positioning precision is improved, but device complexity increases

Engineering Contradiction:

Improvemounting position precisionVSAvoidmounting device structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies dynamics by incorporating an adjustable mounting portion that can be rotated to different angular positions around the bottom bracket axis. The mounting device transitions from a fixed to a dynamic configuration, allowing the user to adjust the derailleur position while maintaining precision through the indicator alignment system.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent segments the mounting device into distinct functional components: a mounting portion for attachment to the frame, a connecting portion for attachment to the derailleur, and an indicator component. This segmentation allows each part to be optimized independently while simplifying the overall adjustment process.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9896157B2Mounting device for bicycle front derailleur

Publication Date: 2018.02.20 SHIMANO INC

AI summary

A mounting device for mounting a front derailleur to a bicycle frame. The mounting device includes a mounting portion that is adapted to be adjustably mounted such that it is positioned around an axis that is defined by a bottom bracket of the bicycle frame, and an indicator configured to indicate an orientation of the mounting portion relative to a predetermined direction.