Bottom Bracket Tool With Chain Whip Torque Engagement

Solution Overview

Problem

The removal and installation of bottom bracket assemblies on bicycle frames can be difficult due to seized threading from exposure to water, dirt, and mud, often requiring substantial manual torque, and existing tools are inadequate for efficient facilitation.

Innovation Solution

A bottom bracket tool with a rim body and connector portion designed to engage with the bottom bracket assembly, featuring teeth for a chain whip tool and a connector that aligns closely with the assembly, allowing for torque application through a chain whip tool, and optionally secured by a fastener to the spindle, facilitating easy removal and installation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If substantial manual torque is applied to unscrew seized bottom bracket assemblies, then the bottom bracket assembly can be removed, but the risk of damage to the assembly and frame increases

Engineering Contradiction:

Improveremoval of bottom bracket assemblyVSAvoiddamage to assembly and frame

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a specialized bottom bracket tool as an intermediary device between the user and the seized bottom bracket assembly. This tool features a connector portion that engages with the bottom bracket assembly and a rim body with teeth for a chain whip tool, allowing torque to be applied through a mechanical advantage system rather than direct manual force, thereby reducing the risk of damage while enabling removal of seized assemblies

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent extends the connection path from direct linear torque application to a multi-dimensional lever arm configuration. The rim body with teeth engages a chain whip tool that wraps around the rim, creating a rotational lever arm that multiplies applied force across a larger radius, converting limited manual torque into substantial removal force without concentrating stress on the bottom bracket assembly or frame

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If existing tools are used for bottom bracket removal, then some removal capability is provided, but the tools are inadequate for efficient facilitation and require substantial manual torque

Engineering Contradiction:

Improveefficiency of bottom bracket removalVSAvoidmanual torque requirement

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent extends the connection path from direct linear torque application to a multi-dimensional lever arm configuration. The rim body with teeth engages a chain whip tool that wraps around the rim, creating a rotational lever arm that multiplies applied force across a larger radius, converting limited manual torque into substantial removal force

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent introduces a specialized bottom bracket tool as an intermediary device between the user and the seized bottom bracket assembly. This tool features a connector portion that engages with the bottom bracket assembly and a rim body with teeth for a chain whip tool, allowing torque to be applied through a mechanical advantage system rather than direct manual force

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If the connector portion is positioned far from the rim body, then alignment flexibility is improved, but misalignment and torque concentration increase

Engineering Contradiction:

Improvealignment flexibilityVSAvoidmisalignment and torque concentration

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent optimizes the geometric parameter of the connector portion's axial distance from the rim body coplanar with the teeth to less than 1/2±1/16 inch. This parameter change ensures the connector is positioned close enough to minimize misalignment and torque concentration, while still providing sufficient engagement depth for secure connection to the bottom bracket assembly

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12454040B2Bottom bracket tool

Publication Date: 2025.10.28 UBHI JASWANT

AI summary

A bottom bracket tool is disclosed. The bottom bracket tool has a rim body having a plurality of teeth defined at an outer periphery thereof, the teeth configured for cooperating with a chain of a chain whip tool. The bottom bracket tool has a connector portion defining a coupling of the bottom bracket tool adapted to engage a correspondingly shaped coupling portion of the bottom bracket assembly. A method of removing a bottom bracket assembly from a bicycle frame is disclosed. The method comprises registering correspondingly shaped coupling portions of the bottom bracket assembly and of a bottom bracket tool, mounting a chain whip tool on teeth defined at an outer periphery of a rim body of the bottom bracket tool, and generating a torque on the bottom bracket tool mounted to the bottom bracket assembly via the chain whip tool.