Retractable Lifeline Spool Lock Assembly for Fall Safety
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Solution Overview
Problem
Retractable lifeline apparatuses used for providing linear anchor points face challenges in efficient deployment and secure locking mechanisms, which can lead to safety concerns during working at heights.
Innovation Solution
A spool lock assembly with a latch plate and lock arm configuration that can be selectively locked or unlocked, featuring a dual-action unlocking operation and secondary safety mechanism, allowing for secure deployment and retraction of the lifeline, and automatic locking in case of a fall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a retractable lifeline is deployed to provide a linear anchor point, then user safety is improved, but the complexity of the deployment and locking mechanism increases
Solution Approach 1:
The locking mechanism is divided into separate functional components: a latch plate for user interaction, a lock arm for engagement, and a spring for biasing. This segmentation allows each component to perform its specific function independently, making the overall system more reliable while maintaining manageable complexity
Solution Approach 2:
The spring-loaded lock arm automatically engages with the latch plate to secure the lifeline in place without requiring additional user action. The system serves itself by using the spring force to maintain the locked position, reducing the need for continuous user intervention while ensuring reliable locking
2Reliability
If a secure locking mechanism is implemented to prevent accidental deployment, then reliability is improved, but the ease of operation for deployment and retraction decreases
Solution Approach 1:
The critical locking function is extracted into a separate lock arm component that can be independently actuated by the latch plate. This allows the locking mechanism to be secured against accidental deployment while maintaining simple user operation through the latch plate interaction
Solution Approach 2:
The lock arm is designed to be dynamically controllable through the latch plate mechanism, allowing easy deployment when needed while maintaining secure locking when not in use. The spring provides dynamic biasing that automatically maintains the locked state without requiring continuous user effort
3Reliability
If automatic locking is implemented in case of a fall, then safety is improved, but the device complexity increases
Solution Approach 1:
The harmful force of a fall is converted into a beneficial automatic locking action. The impact or sudden movement during a fall causes the latch plate to engage with the lock arm, triggering the automatic locking mechanism that prevents further movement and ensures safety
Solution Approach 2:
The system automatically detects and responds to fall conditions through the spring-loaded lock arm that engages with the latch plate upon sudden movement. The mechanism serves itself by using the fall's own forces to trigger the locking action, providing safety without requiring additional sensors or complex control systems
Data Source
AI summary
Various embodiments are directed to a lifeline apparatus and method of using the same. In various embodiments, the lifeline apparatus comprises a spool lock assembly selectively configurable between a locked configuration and an unlocked configuration to facilitate selective deployment of a lifeline from within a housing, the spool lock assembly comprising: a latch plate configurable between a nominal position and an actuated position; a lock arm engaged with the latch plate and configured for arrangement between engaged and disengaged positions based on a latch plate position, wherein the engaged position of the lock arm is defined the lock arm being positioned to prevent the selective deployment of the lifeline by restricting rotation of one or more components operatively connected to the lifeline; wherein the configuration of the spool lock assembly between the locked and unlocked configurations is defined by the latch plate position between the nominal and actuated positions.