Resilient Roller Cage for Reversible Ratchet Tool Stability

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Solution Overview

Problem

Conventional reversible ratchet tools face issues with instability and inability to operate in confined spaces due to roller tilt or sticking, and are unable to handle excessive loads, especially when the swing arc is less than 5 degrees.

Innovation Solution

A reversible ratchet tool design featuring a cage member with resilient members between fingers to maintain rollers upright and a magnetic reversing mechanism, allowing operation with a swing arc as small as 5 degrees, while preventing unintentional sticking and enhancing load-bearing capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the angular distance between each pair of fingers is minimized to prevent roller tilt, then roller stability is improved, but rollers may get stuck between fingers, driving body and driving member, preventing tool handle reversal

Engineering Contradiction:

Improveroller stabilityVSAvoidtool handle reversal

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The fingers are designed with resilient members that allow dynamic adjustment of the cage member structure. When rollers shift position, the resilient fingers can flex to accommodate the changing spatial requirements, preventing rollers from getting stuck while maintaining stability during operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The angular distance between fingers is optimized to a specific range that balances roller stability with reversal capability. The resilient members allow the effective spacing to change dynamically based on operational phase, providing tight spacing for stability during torque application and sufficient spacing for reversal.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the cage member structure is simplified to reduce complexity, then device complexity is reduced, but the ability to maintain rollers upright during shifting is compromised

Engineering Contradiction:

Improvecage member structureVSAvoidroller upright maintenance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The resilient members function as flexible elements within the cage member structure, providing the necessary support to maintain rollers upright during shifting without requiring complex rigid mechanisms. The flexibility of these members allows them to adapt to roller movement while maintaining proper orientation.

Inventive Principle:

Principle #30Flexible shells and thin films

3Adaptability or versatility

If the angular displacement is reduced to operate in confined spaces, then adaptability to confined spaces is improved, but the ability to overcome backlash and cumulative dimensional variations is reduced

Engineering Contradiction:

Improveconfined space operationVSAvoidbacklash compensation

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The magnetic reversing mechanism replaces traditional mechanical reversing systems, enabling reversal with minimal angular displacement. The magnetic field interaction allows for precise control and reversal without requiring the large angular movements needed by conventional mechanical ratchet systems to overcome backlash.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The design enables stable operation in confined spaces with reduced angular displacement, noiseless operation, and improved load-bearing capability without complex structures, enhancing the tool's performance and longevity.

Implementation Method 1

resilient members arranged in the cage spaces respectively... adapted to maintain the rollers upright in place within the cage spaces respectively while the rollers are being shifted

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

a magnetic reversing mechanism, allowing operation with a swing arc as small as 5 degrees

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentUS12434356B2Reversible ratchet tool

Publication Date: 2025.10.07 HANGZHOU UNI HOSEN ELECTROMECHANICAL TOOLS CO LTD

AI summary

A reversible ratchet tool includes a cage-type reversing mechanism including a cage member for shifting rollers from their first positions to their second positions. The structure and configuration of the cage member is improved with resilient members for preventing the rollers being stuck unintentionally when the rollers are positioned either in the corresponding first positions or the corresponding second positions, while being capable of maintaining and restricting the rollers upright in place when the rollers are shifted from the corresponding first positions to the corresponding second positions.