Trunnion-Sheave Winch Cable Guide Prevents Binding
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Solution Overview
Problem
Current winch-cable devices often experience binding issues when recovering objects at angles, leading to inefficiencies, increased wear on cables, and safety hazards due to the inability to redirect the pulling force effectively.
Innovation Solution
The implementation of a trunnion-sheave winch-apparatus with paired trunnion-sheaves that maintain a minimum 90° contact with the winch-cable, redirecting the pulling force to prevent binding and allowing for smooth rewinding regardless of the object's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single dangling pulley is used to guide the winch-cable, then the device complexity is reduced, but the cable binding occurs when recovering objects at angles
Solution Approach 1:
The single pulley is segmented into two separate pulleys arranged in a specific configuration. Each pulley handles a portion of the cable path, allowing the system to manage cable tension and direction more effectively when recovering objects at various angles, thereby preventing cable binding while maintaining reasonable complexity
Solution Approach 2:
The pulley arrangement is extended from a single-point guidance system to a multi-point spatial configuration. By positioning pulleys at different locations and orientations, the system creates a three-dimensional cable path that accommodates angular recovery operations without causing cable binding
2Device complexity
If the winch-cable is allowed to bind on pulley pins, then the device structure remains simple, but the cable wear increases and safety hazards occur
Solution Approach 1:
Additional pulleys serve as intermediary elements between the winch-drum and the recovered object. These intermediaries redirect the cable path smoothly, preventing direct contact between the cable and pulley pins that would cause binding, wear, and potential cable failure
Solution Approach 2:
The cable path parameters are changed by introducing multiple pulleys at specific positions and angles. This modifies the cable's contact points and tension distribution, eliminating the conditions that lead to cable binding and excessive wear on simple structures
3Reliability
If repeated unwinding and rewinding cycles are performed to resolve cable binding, then the cable binding issue is temporarily resolved, but the loss of time and productivity increases
Solution Approach 1:
The pulley system is pre-configured in an optimal arrangement before recovery operations begin. This preliminary setup ensures that the cable path is designed to handle angular loads from the start, preventing binding issues before they occur and eliminating the need for repeated unwinding and rewinding cycles
Solution Approach 2:
The multi-pulley configuration enables continuous cable operation without interruptions. By maintaining smooth cable flow through properly positioned pulleys, the system ensures uninterrupted winding and unwinding actions, thereby maintaining high productivity throughout the recovery operation
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
This solution eliminates cable binding during recovery operations, reduces cable wear, and enhances safety by ensuring consistent contact and control over the winch-cable, allowing for efficient recovery without the need for repeated unwinding and rewinding cycles.
Implementation Method 1
the winch-cable binds on the pins of the pulley-head when the cable is pulling an object that is positioned so that the attached winch-cable is at an angle of 45° to 135° to the long axis of the front bumper-type support
Data Source
AI summary
A cable guide device, including a cable with one end attached to an unwinding/rewinding device, another end having structure for accepting applied force, with cable therebetween guided by a cable guide, wherein as force is applied to the cable, the cable guide causes redirection of the applied force eliminating cable binding as cable is rewound. One embodiment is a trunnion-sheave winch-apparatus for object recovery, including: a trunnion-sheave of a pair of sheaves with cable inserted therebetween, one cable end attached to a winch drum with a hook attached to its other end for connection to an object being recovered, wherein as the object is recovered the force applied to the cable is redirected by the trunnion-sheave causing said cable to be maintained at a minimum of 90° contact with the pair of sheaves regardless of the angle of force being applied to the cable causing elimination of cable binding.