Tractor PTO Kill Switch Cord Actuation Mechanism
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Solution Overview
Problem
Existing lanyard kill switch devices for equipment like farm tractors with power take-off (PTO) are costly, complex, and may not function effectively when pulled at angles outside the predetermined range, leading to safety issues if the operator loses consciousness or is injured.
Innovation Solution
A kill switch system with a switch assembly and control element, including a cord and switch actuating element, that can be easily secured and released to generate a kill signal, allowing for safe shutdown of the equipment even when pulled at non-linear angles, featuring a flexible link member and a biasing element for reduced activation force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the lanyard kill switch is designed to be actuated only within a predetermined angle range, then the switch assembly structure is simplified, but the reliability decreases when pulled at angles outside the predetermined range
Solution Approach 1:
The patent applies the dynamics principle by making the actuating element movable along the cord rather than fixed at a specific angle. The actuating element can slide freely along the cord's length and respond to pulling forces from any direction, allowing the kill switch to be activated regardless of the pull angle. This dynamic configuration resolves the contradiction by maintaining simple structure while achieving reliable activation at various angles.
2Adaptability or versatility
If the release member is forcibly pried away at an acute angle from the switch assembly, then the lanyard can be pulled at any angle, but the force required increases significantly
Solution Approach 1:
The patent uses the cord as an intermediary element that transmits pulling forces from any direction to the actuating element. Instead of requiring direct angular contact between the lanyard and switch assembly, the cord mediates the force transmission, allowing the actuating element to be pulled from any angle with consistent force requirements. This resolves the contradiction by maintaining adaptability to various angles while keeping the activation force reasonable.
3Reliability
If existing lanyard kill switch devices are used, then the equipment can be shut down in emergency, but the cost and installation complexity increase
Solution Approach 1:
The patent segments the kill switch into two independent parts: a switch assembly that mounts to the equipment and a cord with actuating element that attaches to the operator. This segmentation allows each component to be simple and inexpensive while maintaining reliable emergency shutdown capability. The modular design reduces overall device complexity and installation cost compared to integrated commercial solutions.
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 provides a cost-effective, reliable, and safe means to shut down equipment by requiring minimal force to activate the kill switch, even when the equipment is not aligned directly with the tractor, thus enhancing operator safety.
Implementation Method 1
a biasing element, such as a spring, configured and sized for urging the actuating member towards the actuating member first position
Data Source
AI summary
A kill switch including a switch assembly. When the switch assembly moves from a switch first configuration to a switch second configuration with the switch assembly operatively connected to a controller of a tractor, a kill electrical signal is provided to the controller to stop the tractor powering a power take-off thereof. A cord is securable to the switch assembly and to the piece of machinery to extend along a rotary drive shaft between the tractor and the piece of machinery. A switch actuating element extends from the cord, the switch actuating element being removably securable to the switch assembly. In the switch first configuration with the switch actuating element secured to the switch assembly, the switch actuating element maintains the switch assembly in the switch first configuration. When the switch actuating element is removed from the actuating element receiving portion, the switch assembly moves to the switch second configuration.