Slidably Mounted Fulcrum for Complete Weed Root Extraction
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Solution Overview
Problem
Existing hand-operated weeding tools often fail to completely remove weed roots, leading to regrowth, as they lack an effective mechanism for ensuring complete root extraction during the removal process.
Innovation Solution
A handheld weeding tool with a slidably mounted passively locking fulcrum that dynamically locks into place during use, utilizing a compression spring for static locking, allowing for precise adjustment and leverage to ensure complete root removal, featuring a shaft, handle, tip, and fulcrum with a slip-fit aperture for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed fulcrum position is used, then the device complexity is reduced, but the adaptability to different weed sizes and depths is worsened
Solution Approach 1:
The fulcrum is made dynamically adjustable along the shaft rather than fixed, allowing users to reposition it according to weed size and depth requirements. The slip-fit aperture enables smooth movement while the passive locking mechanism ensures secure positioning during use, resolving the contradiction between simplicity and adaptability.
Solution Approach 2:
The fulcrum mounting system is segmented into movable and locking components, allowing independent adjustment of position followed by secure locking. This segmentation enables the fulcrum to adapt to different positions without requiring a completely complex adjustable mechanism.
2Manufacturing precision
If an active locking mechanism is used, then the fulcrum positioning precision is improved, but the ease of operation is worsened due to deliberate engagement required
Solution Approach 1:
The locking mechanism is designed to engage automatically through passive locking, where the fulcrum's own movement and the spring force cause the locking action without requiring deliberate user engagement. This self-service approach maintains positioning accuracy while significantly improving ease of operation.
Solution Approach 2:
A spring-loaded intermediary mechanism mediates between the fulcrum position and the locking action, automatically engaging the lock as the fulcrum is moved into position. This intermediary enables precise positioning without requiring the user to perform separate locking actions.
3Ease of manufacture
If the fulcrum aperture diameter is made larger, then the ease of manufacture is improved, but the dynamic locking reliability is worsened
Solution Approach 1:
The aperture diameter is precisely controlled within a specific range (0.001-0.01 inches larger than shaft diameter) to optimize both manufacturability and locking reliability. This parameter optimization ensures the aperture is large enough for easy manufacturing and smooth movement, yet small enough to provide sufficient friction for dynamic locking.
Solution Approach 2:
The aperture incorporates a localized friction zone or biting edge at specific locations to enhance locking reliability without requiring the entire aperture to be precisely small. This localized quality approach maintains ease of manufacture while ensuring reliable dynamic locking at critical points.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tool effectively leverages user force to lock the fulcrum in place, ensuring complete weed root extraction and preventing regrowth by maintaining friction and positional stability during the prying motion, allowing for efficient removal of various types of weeds.
Implementation Method 1
a static locking mechanism is a compression spring that holds the fulcrum in a fixed position by biasing the distal end of the fulcrum towards the handle
Implementation Method 2
the fulcrum leverages the force of prying a weed from the ground
Implementation Method 3
the edge of the fulcrum's aperture bites into the shaft, holding it longitudinally against the shaft
Data Source
AI summary
A handheld weeding tool with a slidably mounted fulcrum which leverages the force of prying a weed from the ground. During use, the fulcrum becomes locked into a working position. In some embodiments a compression spring holds the fulcrum in a fixed position on the weeder's shaft.