Portable Capstan Winch with Rope Alignment Guide
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Solution Overview
Problem
Existing winch devices for pulling trees or objects are either large and expensive, requiring a tractor, or small and portable with limited pulling capacity and speed, making them inefficient for tasks like forest management and fire mitigation.
Innovation Solution
A portable winch system with a frame, wheels, and a motorized capstan drum that allows for easy transportation and use in difficult terrain, featuring a rope with unlimited length and adjustable speed, and safety features like steerable wheels and automatic shut-off, enabling efficient pulling of heavy loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If large tractor-mounted winches are used, then pulling capacity is sufficient for heavy loads, but portability and ease of transportation deteriorate
Solution Approach 1:
The winch system is separated into two independent components: a stationary anchor point that remains fixed, and a mobile capstan unit that can be transported to different locations. This segmentation allows the pulling function to be distributed, enabling heavy load capability without requiring the entire system to be transported.
Solution Approach 2:
A rope or cable acts as an intermediary element connecting the mobile capstan to the stationary anchor point and the load. This intermediary allows force transmission over distance, enabling the capstan to pull heavy objects without being physically connected to a fixed structure at the operating location.
2Weight of moving object
If small portable capstan winches are used, then portability is improved, but pulling capacity and speed deteriorate
Solution Approach 1:
By separating the capstan from the anchor point, the system allows the capstan to be small and portable while the anchor point provides the structural stability needed for high pulling capacity. The anchor point absorbs reaction forces that would otherwise require the portable unit to be much larger.
Solution Approach 2:
The stationary anchor point acts as a counterbalancing element that absorbs the reaction force generated during pulling operations. This allows the mobile capstan to exert high pulling force without requiring equal counterbalancing mass, thereby maintaining portability while achieving high pulling capacity.
3Device complexity
If fixed-size drums are used, then cable management is simplified, but cable length flexibility deteriorates
Solution Approach 1:
The drum is designed with variable diameter sections or adjustable configurations that allow it to accommodate different cable lengths and winding patterns. This dynamic adaptation enables the same drum to handle both short and long cable requirements without sacrificing management simplicity.
Solution Approach 2:
The drum's effective radius or winding configuration can be changed to accommodate different cable lengths. By varying the winding parameters (such as number of layers, winding diameter, or drum configuration), the system achieves cable length flexibility while maintaining organized cable management.
4Ease of operation
If manual alignment is required for capstan operation, then operational control is improved, but ease of operation deteriorates
Solution Approach 1:
The system incorporates self-aligning features such as guide rollers, tapered approaches, or automatic tracking mechanisms that enable the rope to automatically align with the capstan during operation. This reduces the need for manual intervention and frequent realignment operations.
Solution Approach 2:
Guide structures and alignment features are pre-configured in the system design to automatically direct the rope onto the capstan at the correct angle and position. This preliminary arrangement of alignment elements eliminates the need for manual alignment operations during use.
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
Enables efficient and safe pulling of several thousand-pound objects in challenging environments with reduced operator effort and increased versatility, overcoming limitations of size and capacity in existing winch technologies.
Implementation Method 1
induce friction between the capstan or drum and the section of the rope or cord that is wound about the capstan or drum
Data Source
AI summary
A portable winch system includes a frame, a pair of wheels, a motor that is secured to the frame; and a capstan that is secured to the frame and that is rotatable via the motor. A rope is wound about the capstan in a manner that enables a user to grasp a tail end of the rope and induce friction between the capstan and the portion of the rope that is wound about the capstan. A tow end of the rope is attachable to an object to be pulled by the winch. An input guide attached to the frame is configured to receive the rope and direct the rope toward the capstan as the object is pulled toward the winch. An alignment guide attached to the frame is configured to contact the rope and align the rope about the capstan as the rope is wound about the capstan.