Retractable Tow Reel Shaft Design for Tool-Free Rope Replacement
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Solution Overview
Problem
Existing retractable tow line assemblies for off-road vehicles require time-consuming and tool-dependent processes to replace worn-out ropes, making them inconvenient for field use.
Innovation Solution
A tow reel assembly with a bracket, a two-piece reel, and a shaft that allows quick release and replacement of the tow rope without tools, featuring a diameter greater than the connecting shaft and a torsion spring for easy rope winding, enabling easy swapping of the rope in the field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shaft is permanently fixed to the drum ends, then the structural integrity and reliability are improved, but the time and complexity required for rope replacement increase significantly
Solution Approach 1:
The reel is divided into two separate pieces: the drum ends and the shaft. The shaft can be independently removed from the drum ends by pulling it through the drum hollows, allowing rope replacement without removing the entire reel assembly. This segmentation enables quick field maintenance while maintaining structural integrity during operation.
2Reliability
If the shaft is permanently fixed to the drum ends, then the reliability is improved, but the ease of repair deteriorates
Solution Approach 1:
The reel assembly is segmented into removable components (drum ends and shaft) that can be separated without tools. The shaft passes through hollows in the drum ends, allowing it to be pulled out and reinserted easily for rope replacement while maintaining secure attachment during normal operation.
3Ease of operation
If the entire reel assembly is removed for rope replacement, then the rope can be accessed, but the device complexity and time required increase
Solution Approach 1:
The reel is designed as two separate pieces (drum ends and shaft) that can be independently handled. The shaft can be removed from the drum ends by pulling it through the drum hollows, providing direct access to the rope without removing the entire reel assembly from the vehicle.
Solution Approach 2:
The shaft is extracted as a separate removable component from the drum ends. This extraction allows the rope to be accessed and replaced by working with only the shaft and rope, leaving the drum ends mounted on the vehicle bracket.
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
Facilitates rapid and tool-free replacement of the tow rope, enhancing convenience and efficiency in field operations by allowing quick release and reattachment of the rope ends, improving usability and reducing downtime.
Implementation Method 1
The assembly may include a winding bar to facilitate winding of the rope around the shaft. The assembly may be a retractable tow reel assembly, and may include a spring assembly to facilitate winding of the rope around the shaft. The spring may be a torsion spring.
Data Source
AI summary
A retractable tow reel assembly for an off-road vehicle, the assembly including a bracket having a pair of opposing uprights and mountable to an off-road vehicle, a reel adapted to be held by the bracket when mounted to the vehicle and effective for holding a tow rope, the reel including a shaft and a pair of opposing drum ends having a diameter greater than the diameter of the connecting shaft, and a tow rope having an eye end and a free end, where the eye end is threaded around the shaft, where the shaft has a first end and a second end, and where the first end of the shaft may be released from the first drum end and exposed to facilitate threading of the rope eye over the shaft without releasing the second end of the shaft from the second drum end.