Wrench Connection Seat Segmentation for Stress Distribution

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Solution Overview

Problem

Conventional wrenches are prone to stress concentration and breakage when applying torsional force to screwing members due to the design of the handle and work head connection, which leads to potential collapse or failure during assembly and disassembly.

Innovation Solution

A wrench design featuring a connection seat with two seat bodies and a driving member, utilizing pivot portions and a dovetail structure for enhanced structural strength, allowing for easy assembly and disassembly while distributing force across a larger contact area to reduce stress concentration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the handle and work head are connected by a screw through drilled holes, then the wrench can be assembled and disassembled, but the screwing member concentrates stress on the holes causing collapse or breakage

Engineering Contradiction:

Improveassembly and disassembly capabilityVSAvoidstructural strength at connection points

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The connection seat is divided into two seat bodies with multiple arm portions, creating a segmented structure that distributes stress across multiple contact points rather than concentrating it at a single hole location. This segmentation allows the wrench to maintain assembly/disassembly capability while significantly improving structural strength at connection points.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention transitions from a single-point connection (screw through one hole) to a multi-point distributed connection (multiple arm portions contacting the rod member). This dimensional expansion from 1D to 2D/3D contact area distributes the torsional force across a larger volume, reducing stress concentration and preventing collapse.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Stability of the object's composition

If a screwing member is used to connect handle and work head, then the components can be joined, but the torsional force causes stress concentration that leads to collapse or breakage

Engineering Contradiction:

Improveconnection stabilityVSAvoidresistance to collapse and breakage

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

Multiple arm portions are merged into a single integrated connection seat structure that works together to support the rod member. This merging creates a unified load-bearing system where the combined strength of multiple arms provides both connection stability and resistance to torsional forces, eliminating the reliability issues of single-point connections.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The connection seat combines multiple structural elements (two seat bodies, multiple arm portions, pivot portions) into a composite structure that leverages the strengths of each component. This composite design distributes mechanical stresses across different material zones and geometric features, enhancing overall reliability while maintaining stable connection.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS11685024B2Wrench

Publication Date: 2023.06.27 CHANG WEN CHIEN

AI summary

A wrench is provided, including: a connection seat, including two seat bodies and a connection portion, the two seat bodies respectively including two first pivot portions; and a driving member, movably connected with the connection seat, the driving member including two second pivot portions, and the two second pivot portions being rotatably connected with the two first pivot portions.