Crank Handle Pivot Locking for Cargo Strap Winding Drum
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Solution Overview
Problem
Existing cargo strap winding apparatuses lack a simple and reliable drum locking mechanism that is integral to the drum and crank, often relying on separate locking pins, ratchets, or tying the strap, which complicates the process of securing the strap in place.
Innovation Solution
A strap winding apparatus formed from three separate components - a crank, drum, and U-shaped frame - where the crank can pivot to engage the drum, providing a built-in locking mechanism by extending across the U-shaped frame to prevent drum rotation, utilizing a spring arrangement to bias the drum sections apart and a pivot coupling for secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate locking pins or ratchet arrangements are used for drum locking, then the drum can be locked in place, but the device complexity increases and ease of operation decreases
Solution Approach 1:
The locking function is merged with the crank handle itself. The crank handle is designed to pivot between an operational position (extending outward for gripping) and a locking position (engaging the U-shaped frame side wall). This integration eliminates the need for separate locking pins or ratchet arrangements, thereby reducing device complexity while maintaining reliable drum locking.
Solution Approach 2:
The crank handle serves multiple functions: it acts as both the operational handle for turning the drum and the locking mechanism for securing the drum in place. This multi-functionality reduces the number of components needed and simplifies the overall device structure while ensuring reliable drum locking.
2Reliability
If separate locking pins or ratchet arrangements are used for drum locking, then the drum can be locked in place, but the ease of operation deteriorates
Solution Approach 1:
The locking function is merged with the crank handle itself. The crank handle is designed to pivot between an operational position (extending outward for gripping) and a locking position (engaging the U-shaped frame side wall). This integration eliminates the need for separate locking pins or ratchet arrangements, thereby reducing device complexity while maintaining reliable drum locking.
Solution Approach 2:
The crank handle serves multiple functions: it acts as both the operational handle for turning the drum and the locking mechanism for securing the drum in place. This multi-functionality reduces the number of components needed and simplifies the overall device structure while ensuring reliable drum locking.
3Ease of operation
If the crank handle extends outwardly for gripping, then ease of operation is improved, but the drum locking capability is compromised
Solution Approach 1:
The crank handle is designed to be dynamic rather than static. It can pivot between two main positions: an operational position where it extends outwardly for easy gripping and turning, and a locking position where it engages with the U-shaped frame side wall to prevent drum rotation. This dynamic positioning allows the same component to fulfill both operational and locking functions effectively.
Solution Approach 2:
The crank handle serves multiple functions: it acts as both the operational handle for turning the drum and the locking mechanism for securing the drum in place. This multi-functionality reduces the number of components needed and simplifies the overall device structure while ensuring reliable drum locking.
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 easy handling and secure locking of the cargo strap, ensuring it remains in place without the need for additional locking mechanisms, enhancing convenience and reliability in securing cargo straps.
Implementation Method 1
a spring arrangement formed around a hole formed in U-shaped frame side wall that receives the drum end fitted therethrough, and which spring arrangement engages the drum sides, biasing the drum outer surface adjacent to the crank inwardly, allowing sections of the drum end to spread apart when the crank is pivoted
Data Source
AI summary
A strap winding apparatus consisting of three separate components that are formed in individual molds from a material that will exhibit some elasticity when joining the components together, which components include a crank, drum and U-shaped frame, where the crank includes a straight body with a handle extending outwardly from one end, and with the other body end formed with a pivot for fitting into a drum end that includes a longitudinal slot with a crossing round hole that the crank body pivot end is fitted into to provide a pivot coupling that allows the handle to pivot around the drum end, and the drum opposite end is arranged for fitting through aligned holes formed through first and second sides of the U-shaped frame forming a pivot coupling in the second side hole that allows for turning of the crank to wind a cargo strap onto the drum, and includes a wedge and/or a flat section of a double backed adhesive for mounting a web of the U-shaped frame onto a mounting plate of a cargo strap tightener or onto a cargo strap.