Ratcheting Open Wrench Three-Point Torque Application

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional open-end wrenches face issues with slippage and damage to fasteners due to spreading jaws under load, limited torque capability, and vulnerability of the second jaw to flex or fail, especially when operating on undersized or worn fasteners.

Innovation Solution

A ratcheting open-wrench with a unique head portion inner operating profile featuring three robust torque application points that engage the fastener drive flats, providing superior torque transmission while minimizing damage, and allowing 'face to face' or 'corner point to corner point' ratcheting without removing the wrench head from the fastener.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional open-end wrench jaws are made robust to prevent spreading, then torque capability is improved, but the wrench becomes unable to operate on undersized or worn fasteners

Engineering Contradiction:

Improvetorque capabilityVSAvoidability to operate on undersized or worn fasteners

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The wrench jaw is divided into multiple functional zones: a primary engagement surface for standard fasteners, and secondary protruding engagement surfaces that can contact undersized or worn fastener surfaces. This segmentation allows the single jaw structure to adapt to multiple fastener conditions without compromising overall strength.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the wrench jaw have different geometric properties optimized for specific functions. The primary engagement surface has a standard profile for normal operation, while secondary regions feature protruding surfaces with different geometry for engaging damaged or undersized fasteners, allowing local adaptation without redesigning the entire jaw.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If the second jaw of conventional open-end wrench is made full length to operate opposing fastener faces, then operational capability is improved, but the jaw becomes vulnerable to flex or fail at the distal end

Engineering Contradiction:

Improveability to operate opposing fastener facesVSAvoidstructural integrity of second jaw

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The second jaw incorporates a spring-loaded mechanism that allows dynamic adjustment of engagement force. The spring provides continuous pressure to maintain engagement with fastener faces while absorbing shock and preventing excessive stress concentration at the distal end, thereby maintaining both operational capability and structural integrity.

Inventive Principle:

Principle #15Dynamics

3Object-affected harmful factors

If open-end wrench jaws have smooth planar surfaces for snug fit, then fastener damage is reduced, but slippage occurs on worn or corroded fasteners

Engineering Contradiction:

Improvefastener head damageVSAvoidgrip reliability on worn or corroded fasteners

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The jaw surface features different local characteristics: smooth planar regions for engaging intact fastener surfaces to prevent damage, and protruding secondary engagement surfaces with different geometry for maintaining contact on worn or corroded fasteners. This local differentiation allows the jaw to adapt to varying fastener conditions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The wrench jaw is designed with pre-positioned protruding engagement surfaces that are ready to contact the fastener before full torque is applied. This preliminary contact ensures immediate grip establishment on worn or corroded surfaces, preventing slippage before damage occurs.

Inventive Principle:

Principle #10Preliminary action

4Device complexity

If conventional open-end wrench is designed as one-direction tool, then structural simplicity is maintained, but operational efficiency decreases when flipping is required

Engineering Contradiction:

Improvewrench head structureVSAvoidoperational speed

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The wrench jaw is designed with multiple engagement surfaces and geometric features that enable it to function effectively in both clockwise and counter-clockwise directions without requiring the wrench to be flipped. The symmetric or multi-faceted jaw geometry provides adequate contact surfaces for bidirectional operation, combining structural simplicity with enhanced versatility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20240335922A1Ratcheting Open Wrench

Publication Date: 2024.10.10 BUCHANAN NIGEL

AI summary

A compact three torque application point, ratcheting open-wrench, wherein the operated first and third torque application points are under tension gripping and pulling around their corresponding fastener driven half face whilst the second torque application point is under compression pushing its corresponding fastener driven half face. Contact with the worked fastener driven half faces being in generally the same point within each driven half face largely equalizing any lever arm force applied. The head portion fastener access being approximately at 90 degrees to the handle portion and the second torque application points radiused leading edge is incorporated near the extremely strong point of convergence between the handle portion and the head portion resulting in a far greater inherent ratcheting open-wrench torque capability as there is now no circumstance that the normally susceptible second jaw can either flex or fail as in effect there is no second jaw as such.