Manhole Cover Lifting Device with Adjustable Carriage Hook
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Solution Overview
Problem
Conventional manhole cover removal tools are labor-intensive, require significant strength, and are ineffective for modern manhole covers with sealed pick hole slots, posing safety risks due to easy hook slippage and inability to efficiently lift heavy covers.
Innovation Solution
A manhole cover lifting device with an elongated member, adjustable carriage hook, and scraping hook, designed to reduce effort and enhance ergonomics, featuring a handle, adjustable mechanism, and self-adjusting capability for various cover sizes, allowing secure engagement with pick hole slots and reducing the need for excessive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manhole hooks are used to remove manhole covers, then the pick holes allow access to the cover, but the hooks easily slide out of the pick hole slots causing accident and injury
Solution Approach 1:
The patent introduces a specialized lifting device with a carriage hook and elongated member that acts as an intermediary between the operator and the manhole cover. The carriage hook engages with the pick hole slots more securely than conventional hooks, preventing slippage while maintaining access to the sealed pick hole slots.
2Ease of operation
If conventional manhole hooks are used to remove manhole covers, then the hooks can engage the pick holes, but the process requires significant strength and effort due to the weight of cast iron covers
Solution Approach 1:
The lifting device incorporates an adjustable carriage hook that can be positioned at different locations along the elongated member. This dynamic adjustment allows the operator to optimize the lifting mechanical advantage based on the specific cover weight and size, reducing the effort required to lift heavy cast iron covers.
Solution Approach 2:
The device extends the lifting action into a different dimensional space by using the elongated member to reach across the pick hole slots and provide leverage. This creates a mechanical advantage that reduces the force required at the handle while still generating sufficient lifting force.
3Object-affected harmful factors
If modern manhole covers have sealed pick hole slots to prevent gas escape, then odors and gases are contained, but conventional manhole hooks become ineffective for removal
Solution Approach 1:
The carriage hook serves as an intermediary that can engage with the sealed pick hole slots without compromising the seal. The design allows the hook to interface with the slot geometry while maintaining the integrity of the rubber seal, enabling removal of modern sealed covers without breaking the gas containment.
4Productivity
If conventional picks are used for removal, then the process can be completed, but it is very labor intensive and requires a lot of strength and effort
Solution Approach 1:
The adjustable carriage hook mechanism allows dynamic optimization of the lifting configuration. By adjusting the hook position along the elongated member, the operator can maximize mechanical advantage and minimize labor intensity, making the removal process more efficient and less physically demanding.
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 device significantly reduces the effort and risk associated with removing manhole covers, providing an ergonomic and efficient method for lifting various sized covers, including those with sealed pick hole slots, by distributing the force effectively and ensuring secure engagement.
Implementation Method 1
The scraping hook is positioned in the second pick hole slot... secure engagement with pick hole slots
Implementation Method 2
An adjustable member slides along the elongated member between a first stop and a second stop... self adjusting to various sized manhole covers
Data Source
AI summary
A manhole cover lifting device has an elongated member which extends a length between a first end and a second end. A handle is connected to the first end and a scraping hook is connected to the second end. An adjustable member slides along the elongated member between a first stop and a second stop. A carriage hook is adjustably connected to the adjustable member.