Metal Tube Spade Handle Resists Root Leverage Breakage

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Solution Overview

Problem

Conventional spades with wooden handles often break and metal spade blades deform when used in firm soils with heavy root systems, making them unsuitable for heavy-duty clearing work.

Innovation Solution

A spade with a continuous metal handle made from high-alloy steel and a spherical hardwood knob, combined with a thick, sharpened metal spade blade, providing flexibility and strength for levering and cutting through roots without handle breakage or blade deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a wooden handle is used, then the spade is lighter and easier to manufacture, but the handle breaks during leverage in firm soils

Engineering Contradiction:

Improvehandle strengthVSAvoidspade weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The handle material is changed from wood to metal (steel tube), fundamentally altering the physical parameters of the handle to achieve both high strength and appropriate weight for heavy-duty spading operations

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The spade combines a metal tube handle with a wooden grip section, creating a composite structure that leverages the strength of metal and the ergonomic properties of wood to resolve the contradiction between strength and weight

Inventive Principle:

Principle #40Composite materials

2Strength

If a thin spade blade is used, then the spade is lighter and easier to maneuver, but the blade deforms when penetrating root systems

Engineering Contradiction:

Improveblade strengthVSAvoidspade weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The blade thickness parameter is increased to 4-6mm, fundamentally changing the blade's physical properties to resist deformation during root penetration while maintaining maneuverability through optimized geometry

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If a rigid handle is used, then the handle provides stable leverage, but shock loads are transmitted to the user's hands and arms

Engineering Contradiction:

Improvehandle stabilityVSAvoidshock load transmission

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The metal tube handle acts as a flexible element that can bend and absorb shock loads during levering operations, protecting the user's hands and arms while maintaining structural stability for heavy-duty work

Inventive Principle:

Principle #30Flexible shells and thin films

4Ease of operation

If a conventional handle design is used, then the spade is easier to manufacture, but the spade is difficult to handle during levering operations

Engineering Contradiction:

Improvespade handlingVSAvoidhandle structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The spherical knob at the handle end provides ergonomic grip and leverage points that facilitate easy handling during levering operations, while the curved contour of the metal tube handle follows natural hand positions to reduce strain

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentEP3387889B1Spade

Publication Date: 2020.02.26 IDEALSPATEN BREDT GMBH & CO KG

Figure 1

AI summary

Spade with a handle (1), a grip (5) at the upper end of the handle and a metal spade blade (3) attached to the handle (1), characterized in that the handle (1) is formed entirely from a metallic tube (7), preferably a steel tube, and that the grip is preferably designed as a round knob (5), in particular made of hardwood, and is attached to the upper end of the handle (1), for which purpose the knob is preferably provided with a bolt-like plug (14) which can be inserted into the upper end of the tube, preferably fitting into position.