Variable Direction Reversal Bars in Tensioning Ratchets
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Solution Overview
Problem
Existing tensioning ratchets face limitations in applying high tensioning forces without overstressing individual components, as they are constrained by user strength and regulatory limits on manual force, leading to uneven loading and potential damage.
Innovation Solution
A tensioning ratchet with variable circumferential faces of direction reversal bars that adjust under load, allowing for optimal coil formation and uniform loading, enabling higher tensioning forces while maintaining manageable weight and dimensions, achieved through adjustable mounting and cam-shaped designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If higher tensioning forces are applied to the winding-on shaft, then the pre-tensioning capability is improved, but the manual force required exceeds user strength and regulatory limits
Solution Approach 1:
The direction reversal bars are designed to be movable relative to each other along the winding-on shaft, allowing the system to dynamically adjust its geometry under load. This dynamic adjustment creates a mechanical advantage that multiplies the user's manual force, enabling high pre-tensioning forces to be applied without exceeding regulatory limits on manual force.
2Device complexity
If the direction reversal bars are fixed at identical positions, then the structural simplicity is maintained, but the loading becomes uneven and components are overstressed
Solution Approach 1:
The direction reversal bars are designed to be movable relative to each other along the winding-on shaft, allowing the system to dynamically adjust its geometry under load. This dynamic adjustment creates a mechanical advantage that multiplies the user's manual force, enabling high pre-tensioning forces to be applied without exceeding regulatory limits on manual force.
Solution Approach 2:
The position of the direction reversal bars along the winding-on shaft is changed from fixed to variable. Under tensioning load, the bars automatically adjust their positions to optimize the coil formation and distribute the mechanical stress evenly across all bars, preventing overstress while maintaining structural simplicity.
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 solution allows for higher pre-tensioning forces to be applied safely and efficiently, distributing loads evenly across all direction reversal bars, preventing overstress and ensuring compliance with manual force limits without requiring a reinforced construction.
Implementation Method 1
the circumferential faces, at least of the outer circumferential face of the direction reversal bars coming into contact with the tensioning means, is/are variable
Data Source
AI summary
A tensioning ratchet for tautening and holding tensioning means, such as webbings, extruded straps, ropes, chains and the like, includes a console, with a winding-on shaft, rotatably mounted in the console, which is formed by at least two direction reversal bars, delimiting a distance between one another, and with a tensioning lever for turning the winding-on shaft about an axis of rotation. The tensioning ratchet according to the invention withstands a higher load and enables high pre-tensioning forces to be applied while preventing inadmissible stress on the user. This is achieved by the fact that the position at least of the outer circumferential face of the direction reversal bars coming into contact with the tensioning means, is variable.