Adjustable Bicycle Stem Assembly With Hidden Cable Routing

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Solution Overview

Problem

Existing bicycle stems do not allow for adjustable length and height modifications, and they often expose cables externally, which is aesthetically unpleasing and cumbersome.

Innovation Solution

An adjustable stem assembly comprising a base, support, and optional separator, allowing for four distinct configurations that change the handlebar's height and length, with integrated cable passages within the stem.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a rotatable connection is used to adjust handlebar position, then the handlebar position can be adjusted along a circular trajectory, but the stem length cannot be modified and remains constant

Engineering Contradiction:

Improvehandlebar position adjustmentVSAvoidstem length

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

The stem is divided into multiple separable components (first stem component, second stem component, and optional third stem component) that can be independently positioned and connected. This segmentation allows the stem length to be modified by selecting different combinations and arrangements of the components, thereby resolving the limitation of fixed stem length in traditional rotatable connections.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If cables are routed externally on the stem, then cable access is simplified, but the appearance becomes aesthetically unpleasing and cumbersome

Engineering Contradiction:

Improvecable routingVSAvoidaesthetic appearance

Core Design Contradiction:

Ease of manufactureVSShape

Solution Approach 1:

The stem components are designed with internal passages that accommodate and conceal the cables within the stem structure. The cables are nested inside the stem components rather than being exposed externally, which maintains the aesthetic appearance while still allowing for practical cable routing and access through the integrated passages.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Adaptability or versatility

If multiple stem components are used to achieve adjustable configurations, then handlebar positioning flexibility is improved, but device complexity increases

Engineering Contradiction:

Improvestem configuration optionsVSAvoidnumber of components

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The stem components are designed with universal features including standardized connection interfaces, integrated cable passages, and mounting options that allow the same components to serve multiple functions and be arranged in different configurations. This multi-functionality reduces the need for numerous specialized parts, thereby managing complexity while providing adjustable stem length and handlebar positioning options.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250382029A1Adjustable bicycle stem assembly and method for mounting said assembly

Publication Date: 2025.12.18 ORBEA

AI summary

The invention discloses an adjustable stem assembly (1) for a bicycle comprising: a base (2) configured for fixation to the fork (H) of a bicycle (B); a support (3) configured for fixation to the base (2) alternatively in two positions and having a handlebar fixation means (32); a separator (4) for optional fixation between the base (2) and the support (3). Thus, the assembly (1) alternates between four configurations referred to respectively as short high, short low, long high and long low, where the height of the handlebar fixation means (32) is different in each of said four configurations. The invention also discloses a method for installing said stem assembly (1).