Mechanical Overload Sensor for Planetary Winch
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Solution Overview
Problem
Existing overload sensors for winches, which rely on monitoring electric power draw, are prone to inaccuracies due to power supply issues and require complex circuits, making them unreliable for safe load measurement.
Innovation Solution
A mechanical overload sensor system that directly measures the load on a winch using a simple electric switch and biasing mechanism, where the switch opens to stop power to the motor when the load exceeds a preset limit, protected within the winch case and adaptable for both under-wound and over-wound configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric power draw monitoring is used to detect overload, then the winch can be controlled to stop when overloaded, but the measurement is inaccurate due to power supply issues and electrical connections
Solution Approach 1:
The patent replaces the electrical monitoring system with a direct mechanical sensing system. A mechanical sensor directly contacts the winch drum or gear mechanism to physically detect overload conditions through mechanical force or torque, eliminating the inaccuracies associated with electrical power draw measurements while maintaining the ability to reliably stop the winch when overloaded.
Solution Approach 2:
The patent introduces a mechanical intermediary element (such as a spring-loaded plunger or lever arm) that translates mechanical stress on the winch into a detectable position change or electrical signal. This intermediary provides a direct mechanical connection to the load, ensuring accurate overload detection independent of electrical power supply variations.
2Reliability
If electric power draw monitoring with complex circuits and microprocessors is used, then overload can be detected, but the system becomes complicated
Solution Approach 1:
The patent extracts and eliminates the complex microprocessor and circuit board components from the overload detection system. By using a simple mechanical sensor that directly responds to overload conditions through physical displacement or force, the system achieves reliable overload detection with minimal electronic components, significantly reducing device complexity.
Solution Approach 2:
The patent employs simple, inexpensive mechanical components (such as springs, plungers, or levers) instead of expensive electronic circuits and microprocessors. These mechanical elements are robust, easy to manufacture, and replace if needed, providing a cost-effective solution that maintains reliability while minimizing complexity.
3Measurement precision
If a mechanical overload sensor is used to directly measure load, then measurement accuracy improves, but the sensor is exposed to elements and physical abuse
Solution Approach 1:
The patent nests the mechanical sensor within the protected interior of the winch housing or gear case. The sensor is positioned inside the sealed enclosure, where it remains shielded from environmental elements such as water, dust, and corrosion, while still being mechanically connected to detect overload conditions through the gear train or drum mechanism.
Solution Approach 2:
The patent uses a protective intermediary structure (the winch housing and internal mounting bracket) that physically shields the mechanical sensor from direct exposure to harsh environments. The sensor remains inside the protected space, connected to the load through controlled mechanical linkages, thereby maintaining measurement accuracy while reducing vulnerability to physical abuse and environmental damage.
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
Provides a reliable and direct method for load measurement, preventing winch overload by interrupting power supply with high accuracy and simplicity, while being protected from environmental and physical damage.
Implementation Method 1
A switch is mounted in the gear case and has means for biasing the tab toward the switch. When the winch is reeling in the rope (i.e. pulling), the force of the pull causes the ring gear to want to rotate counter clockwise. If the force of the pull or load is too great, it will exceed the force being placed on the tab of the ring gear by the plunger.
Data Source
AI summary
A mechanical overload sensor system for a planetary winch having a biasing means that when overcome by the force on a ring gear, opens an electric switch which terminates power to the winch.