Harness Interlock Circuit for Verified Fall-Arrest Attachment
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Solution Overview
Problem
Existing fall-arrest protection devices in warehouses and construction environments often fail due to user neglect, leading to potential injuries or fatalities as individuals forget to wear or secure the safety harnesses.
Innovation Solution
A safety interlock system comprising a safety harness with buckles, a safety attachment ring, a harness interlock circuit, and an equipment safety interlock circuit that uses current sensors and relays to ensure the harness is properly secured before allowing machine operation, and incorporates light sensors and antennas for additional attachment verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety harness with buckles is used, then fall protection is provided, but users may forget or neglect to use it properly
Solution Approach 1:
The system provides immediate feedback through an interlock circuit that detects whether the safety attachment ring is properly connected to the harness. The circuit includes a coil and switch that close only when the ring is securely attached, providing visual or audible confirmation to the user that the safety connection is established, thereby ensuring proper usage without relying on user memory
Solution Approach 2:
The safety system performs self-verification by automatically detecting through the interlock circuit whether the attachment ring is properly connected. The system monitors its own safety status without requiring external verification, and only permits machine operation when the safety connection is confirmed, making the compliance check automatic and eliminating reliance on user initiative
2Ease of operation
If the machine can operate without verifying harness attachment, then ease of operation is maintained, but safety is compromised
Solution Approach 1:
The interlock circuit is designed to verify safety conditions before allowing machine operation. The circuit checks whether the attachment ring is properly connected to the harness prior to enabling machine function, ensuring that safety protocols are established in advance rather than as a reactive measure, thus maintaining both safety and operational convenience
Solution Approach 2:
The interlock circuit acts as an intermediary between the safety harness system and the machine control system. It mediates the connection by detecting the proper attachment of the safety ring and only then permitting machine operation, thereby bridging the safety requirement with operational convenience without direct human intervention
3Measurement precision
If multiple verification methods (current sensors, light sensors, antennas) are implemented, then safety detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system combines multiple verification methods including current sensors, light sensors, and antennas into a single integrated interlock circuit system. These different sensing mechanisms work together to provide comprehensive verification of safety attachment, with the circuit design consolidating multiple functions into a unified system that improves detection accuracy while managing complexity through integration
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 system effectively prevents machine operation unless the safety harness is correctly secured, thereby reducing the risk of accidents by ensuring that users adhere to safety protocols.
Implementation Method 1
a harness interlock circuit including a harness coil (414) attached to the safety attachment ring (152)... an equipment safety interlock circuit (60) including a fall-arrest coil (600)
Implementation Method 2
an oscillator (412) electrically coupled to the battery (402), the oscillator configured to produce an oscillating signal that drives the harness coil (414)
Implementation Method 3
a light-sensor ring (1201) including a plurality of light emitters (1401) and a plurality of light sensors (1202)
Implementation Method 4
a harness antenna (1220) electrically coupled to the harness controller (1210)... an equipment safety antenna (1301) electrically coupled to the equipment controller (1310)
Data Source
AI summary
A safety interlock system includes a safety harness comprising a plurality of buckles to secure the harness to a user and a safety attachment ring. A fall-arrest belt clip is configured to be releasably attached to the safety attachment ring, the fall-arrest belt clip attached to a fall-arrest tether of a machine. The system further includes a safety interlock means for disabling an operation of the machine when the fall-arrest clip is detached from the safety attachment ring, the machine coupled to the fall-arrest tether.