Marine Winch Handle Biasing Mechanism for Safe Tension Release
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Solution Overview
Problem
Manual marine winches often experience undesired handle movement during tension release, posing safety risks to operators due to accidental engagement of the handle with the gearing, especially when a cheater bar is left engaged, leading to violent and potentially injurious handle rotation.
Innovation Solution
A biasing mechanism, either a counterweight or spring, is selectively engaged by the handle to automatically bias it toward the stowed position when engaged with the drum, preventing rapid and violent rotation and ensuring safe tension release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is left engaged with the gearing during tension release, then the winch can be operated, but violent and potentially injurious handle rotation occurs
Solution Approach 1:
The spring mechanism applies a preliminary opposing force to the handle's rotational movement. When the handle is pulled from the stowed position, the spring immediately engages to provide counter-resistance, preventing the violent rotation that would otherwise occur during tension release. This preliminary anti-action neutralizes the harmful effect before it can manifest.
Solution Approach 2:
The spring acts as an intermediary element between the handle and the drum gearing. Instead of the handle directly engaging the gearing under high tension, the spring mediates the interaction by absorbing and controlling the forces involved, thereby preventing violent handle rotation while still allowing operational movement.
2Force
If a cheater bar is left engaged on the handle, then leverage is increased for tensioning, but injury risk increases during tension release
Solution Approach 1:
The spring mechanism provides preliminary counter-force that opposes any rapid rotation of the handle, including when a cheater bar is attached. This preliminary anti-action significantly reduces the leverage effect during tension release, preventing the cheater bar from acting as a weapon while maintaining its leverage benefit during controlled tensioning operations.
3Reliability
If the handle is automatically returned to stowed position, then safety is improved, but additional mechanism complexity is introduced
Solution Approach 1:
The spring mechanism is a self-service system that automatically returns the handle to the stowed position without requiring additional actuators, motors, or control systems. The spring stores energy during handle operation and automatically releases it to return the handle, providing safety functionality through a simple, self-contained mechanical system that adds minimal complexity.
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 biasing mechanism effectively prevents unintended handle movement, reducing the risk of injury and damage by automatically returning the handle to the disengaged position, thus enhancing safety and operational ease while maintaining the standard operation of the winch.
Implementation Method 1
A biasing mechanism, either a counterweight or spring, is selectively engaged by the handle to automatically bias it toward the stowed position when engaged with the drum
Implementation Method 2
A biasing mechanism, either a counterweight or spring, is selectively engaged by the handle to automatically bias it toward the stowed position when engaged with the drum
Data Source
AI summary
A manual marine winch includes a winch housing; a rotating drum assembly supported on the housing; a winch line selectively spooled and un-spooled on the drum; a manually actuated control for spooling and un-spooling the winch line including a handle for selectively tensioning the drum and moveable between a position engaged with the drum for winch line tensioning and stowed position wherein the handle is not engaged with the drum; a tension holding mechanism comprising at least one ratchet gear coupled to the drum, at least one pawl selectively engaged with at least one ratchet gear to hold tension on the winch line, and a knockout configured to selectively disengage each of the pawls to allow for release of tension on the winch; and a biasing mechanism selectively engaged by the handle and configured to bias the handle toward the stowed position when the handle is engaged with the drum.