Edging Tool Blade Segmentation for Root Severing
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Solution Overview
Problem
Conventional tools are inefficient and unsafe for removing invasive vines like English ivy, as they are not specifically designed for cutting near the ground, often miss or cut vines multiple times, fail to address the root system, and require excessive effort, leading to incomplete removal and potential damage to surrounding flora and soil.
Innovation Solution
A manual tool with a shaft and blade configuration that includes a step for stability, a blade with multiple teeth for effective cutting, and a pivot mechanism for easy movement through soil, designed to sever roots and create a trench for efficient removal of vines without the need for toxic chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional tools (pruning loppers, hedge clippers, spades, brush axes) are used to cut vines, then cutting action is performed, but the tools are unsafe with exposed sharp edges and not meant for cutting near one's feet
Solution Approach 1:
The tool divides the cutting function into two separate components: a blade for cutting vines and a shaft for providing leverage and safety. The blade is positioned low to the ground while the shaft extends upward, keeping the operator's hands away from the cutting zone and eliminating the safety hazard of exposed sharp edges near the feet.
Solution Approach 2:
The shaft acts as an intermediary between the operator's hands and the blade. By extending the shaft upward and providing a handle at the top, the operator can apply force from a safe distance, with the shaft mediating the transmission of force while keeping hands away from the dangerous cutting area.
2Productivity
If conventional tools are used to cut vines, then cutting action is performed, but they cut inconsistently, missing individual vines or cutting them multiple times
Solution Approach 1:
The blade is segmented into multiple teeth rather than a single cutting edge. This multi-tooth configuration allows the blade to engage multiple vines simultaneously and provides consistent cutting action across different vine positions, eliminating the inconsistency of missing vines or requiring multiple cuts.
Solution Approach 2:
The cutting action is extended into the horizontal dimension by positioning the blade low to the ground and extending it laterally. This allows the blade to intercept vines at ground level as they emerge, ensuring consistent cutting of individual vines at their base rather than attempting to cut them above ground.
3Productivity
If conventional tools are used to remove vines, then cutting action is performed, but they either don't deal with the roots or cut them while underground (making broken pieces more difficult to detect and remove)
Solution Approach 1:
The blade cuts the vine roots at ground level before they extend underground. By severing the roots at their emergence point, the tool performs the cutting action preliminarily, making the root pieces visible and accessible for removal before they become buried and difficult to detect.
Solution Approach 2:
The blade extends slightly below ground level to ensure complete severing of roots at their base, performing a slight excessive action to guarantee that root pieces are cleanly separated and remain visible on the surface for easy removal, rather than being completely buried.
4Ease of operation
If conventional tools are used to cut vines, then cutting action is performed, but they require lots of effort per vine cut with operator in stooped over or uncomfortable positions
Solution Approach 1:
The tool segments the force application function from the cutting function. The shaft provides a long lever arm that allows the operator to apply force from an upright position, while the blade performs the cutting action. This segmentation eliminates the need for stooped positions by separating where force is applied (at handle height) from where cutting occurs (at ground level).
Solution Approach 2:
The operator's position is changed from a horizontal stooped posture to a vertical upright posture. By extending the shaft upward and providing a handle at top height, the cutting action is transferred to ground level while the operator remains in a comfortable vertical position, changing the dimensional orientation of force application.
Data Source
AI summary
A tool comprises a blade operatively connected to a shaft and also comprises a foot plate operatively connected to the blade or the shaft. The tool is adapted for applications including, but not limited to, trenching and edging. In particular, the tool is adapted so the blade can travel forward in an arc without coming completely out of the soil. The blade can be designed to cut through roots up to a limited size.