Spring-Release Ratchet Mechanism for Limiting Tension
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Solution Overview
Problem
Ratcheting tie-down mechanisms often apply excessive tension, which can damage cargo or the structure it is anchored to, and pose difficulties in achieving consistent tensioning, especially when securing child car seats.
Innovation Solution
A ratchet tensioning mechanism with a spring-release mechanism that limits torque to a predetermined level, allowing for adjustable tension settings through a pivotally attached handle with spring-biased plungers, preventing overtightening by disengaging from the ratchet spool when the preset tension is exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a ratcheting mechanism is used to apply tension to the strap, then the tensioning force is increased and mechanical advantage is achieved, but the tension may become excessive and damage the cargo or anchoring structure
Solution Approach 1:
The patent applies parameter changes by using a spring mechanism with a predetermined breakaway force that limits the maximum tension to a safe level. The spring's mechanical properties are specifically selected so that it breaks away when excessive force is applied, thereby changing the force parameter from unbounded to bounded at a predetermined safe value.
Solution Approach 2:
The patent implements beforehand cushioning by incorporating a spring element that absorbs and limits excessive force before it can reach the cargo or anchoring structure. The spring acts as a protective element that preemptively prevents damage by breaking away under excessive load conditions.
2Ease of operation
If a lever arm is used to turn the spool and provide mechanical advantage, then a large amount of tension can be applied by nearly any user, but the cargo can be crushed or the structure damaged
Solution Approach 1:
The patent changes the force parameter by introducing a spring with predetermined breakaway force that limits the maximum tension regardless of how much force the user applies through the lever arm. This ensures ease of operation while preventing excessive force from reaching the cargo.
Solution Approach 2:
The spring acts as an intermediary element between the user's applied force and the cargo. It mediates the force transmission by allowing controlled tension buildup while breaking away before excessive force can damage the cargo, thus protecting the cargo while maintaining user-friendly operation.
3Productivity
If the ratchet mechanism allows continuous winding of the strap, then the tension can be increased as needed, but it becomes difficult to achieve consistent tensioning and overtightening occurs
Solution Approach 1:
The spring provides beforehand cushioning by being pre-set to break away at a specific force level. This predetermined breakaway point ensures consistent tensioning by preventing overtightening, while still allowing rapid winding of the strap during normal operation.
Solution Approach 2:
The spring mechanism provides mechanical feedback through its breakaway action. When the predetermined tension level is reached, the spring breaks away, providing immediate feedback to the user that the correct tension has been achieved, thereby ensuring consistent tensioning without requiring user judgment or measurement.
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
Ensures consistent and proper tensioning without damaging the cargo or the anchoring structure, enhancing the reliability of securing child car seats and other cargo by preventing excessive force application.
Implementation Method 1
a spring release mechanism that limits the torque applied via the tensioning device to a predetermined level
Data Source
AI summary
The present disclosure provides a new method and apparatus for a ratchet tensioning mechanism. The apparatus uses a spring release mechanism to limit the torque applied via the tensioning device to a predetermined level. In an alternative configuration the limit of the tension could be adjusted by the user.