Manhole Cover Tool Leverage Fulcrum Design
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Solution Overview
Problem
Existing tools for moving heavy objects like manhole covers are ineffective in providing safe, ergonomic, and efficient removal and relocation with minimal effort, often impeding access to the manhole.
Innovation Solution
A tool with a handle that includes a body with a toe and heal pad for leverage, and a fulcrum for pivot points, allowing secure and efficient lifting and relocation of manhole covers while maintaining access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing tools are used to move heavy objects like manhole covers, then the objects can be moved, but the tools are ineffective in providing safe, ergonomic, and efficient removal and relocation with minimal effort
Solution Approach 1:
The tool body is segmented into distinct functional zones: a toe portion for insertion under the manhole cover, a heal pad for foot placement, and a fulcrum for pivot points. This segmentation allows each part to perform its specific function optimally, enabling safe and ergonomic removal with minimal effort while maintaining high productivity.
Solution Approach 2:
The tool acts as an intermediary mechanism between the operator and the heavy manhole cover. By providing leverage points (fulcrum), insertion points (toe), and stable foot placement (heal pad), the tool mediates the interaction, reducing the direct physical effort required while maintaining operational efficiency and safety.
2Ease of operation
If existing tools are used to remove and relocate heavy objects, then movement is achieved, but access to the manhole is impeded
Solution Approach 1:
The tool incorporates a fulcrum that enables dynamic pivot movement, allowing the manhole cover to be rotated from a horizontal position (over the manhole) to a vertical position (against the manhole). This dynamic capability maintains access to the manhole while completing the removal operation, resolving the contradiction between ease of operation and accessibility.
3Productivity
If existing tools are used for moving heavy objects, then some movement is possible, but physical effort and ergonomic concerns remain high
Solution Approach 1:
The heal pad is designed with a curved bottom surface that matches the natural contour of the operator's foot. This curvature distributes pressure evenly across the foot during application, reducing localized stress and improving ergonomic comfort while maintaining high productivity through efficient leverage.
Solution Approach 2:
The tool changes the mechanical parameters of the lifting operation by introducing leverage through the fulcrum and heel pad. This transforms the direct lifting force into a mechanical advantage system, reducing the physical effort required while maintaining or improving productivity through more efficient force application.
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 enables safe and ergonomic movement of heavy manhole covers with reduced effort, ensuring consistent and reliable operation by providing enhanced leverage and access to the manhole.
Implementation Method 1
The back end of the body includes a heal pad extending away from the middle area with a first portion of the bottom edge defined by the heal pad being offset a first vertical distance from a second portion of the bottom edge defined by the middle area to create a heal gap between a bottom surface of the heal pad and an imaginary line formed by and extending parallel out from the second portion of the bottom edge defined by the middle area
Implementation Method 2
A fulcrum is joined to the body and defining a fulcrum portion of the bottom edge with the fulcrum projecting away from the top edge. The fulcrum portion is offset a second vertical distance from the second portion of the bottom edge defined by the middle area to create a fulcrum gap between a bottom surface of the fulcrum and the imaginary line formed by and extending parallel out from the middle area of the bottom edge
Data Source
AI summary
A tool joinable with a handle. The tool includes a body, the body includes a middle area configured to be joinable to the handle. The front end of the body includes a toe extending away from the middle area. The toe includes a first vertical thickness and a second vertical thickness less than the first vertical thickness for a length of the toe extending away from the middle area. The back end of the body can include a heal pad extending away from the middle area and to create a heal gap between a bottom surface of the heal pad and the second portion of the bottom edge defined by the middle area. The tool can include a fulcrum joined to the body and defining a fulcrum portion of the bottom edge with the fulcrum projecting away from the top edge.