Reinforced Digging Tool Shaft Joint Against Collar Breakage

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Solution Overview

Problem

Existing digging tools suffer from deformation or breakage at the connection point between the cutting means and the elongated handle or shaft due to applied forces, necessitating a solution to enhance structural integrity.

Innovation Solution

Incorporating a reinforcement means within the shaft's longitudinal aperture, with a portion located within the collar and another portion outside, to distribute stress and prevent breakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If an elongated handle or shaft is used to provide leverage for digging, then the digging capability is improved, but the shaft becomes susceptible to deformation or breakage at the connection point with the collar

Engineering Contradiction:

ImproveleverageVSAvoidshaft strength at connection point

Core Design Contradiction:

PowerVSStrength

Solution Approach 1:

The invention uses a composite structure combining wood (or plastic) shaft material with a metal reinforcement means (such as a steel pin or rod). This composite construction provides both the leverage of a long shaft and the strength of metal at the critical connection point, preventing deformation and breakage while maintaining the elongated handle's digging capability

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The shaft is divided into distinct functional segments: the main shaft body (wood or plastic) and the reinforcement means (metal pin or rod) located at the connection point. This segmentation allows each part to perform its specific function - the main shaft provides leverage while the reinforcement segment provides structural strength at the vulnerable joint area

Inventive Principle:

Principle #1Segmentation

2Length of moving object

If the shaft is made longer to increase leverage, then the mechanical advantage is improved, but the stress on the connection point increases leading to potential breakage

Engineering Contradiction:

Improveshaft lengthVSAvoidstress at connection point

Core Design Contradiction:

Length of moving objectVSForce

Solution Approach 1:

The reinforcement means is strategically positioned at the local area of highest stress (the connection point between collar and shaft) rather than throughout the entire shaft. This localized reinforcement provides the necessary strength to handle the increased forces generated by the longer shaft's leverage while maintaining the overall length and mechanical advantage

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP4684616A1Tool for digging

Publication Date: 2026.01.28 WESTLAND HORTICULTURE

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AI summary

A tool 1 for digging comprises a cutting means 2 comprising a blade 21 and a collar 22, a shaft 3 comprising a longitudinal aperture 31, a fastening means 4 for attaching the cutting means 2 to the shaft 3 and a reinforcement means 5 located within the longitudinal aperture 31 of the shaft 3. The cutting means 2 is attached to the shaft 3 such that a first portion 51 of the reinforcement means 4 is located within the collar 22 and a second portion 52 of the reinforcement means 4 is located outside the collar.