Disconnectable Self-Retracting Lifeline for Field Rope Replacement
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Solution Overview
Problem
Existing self-retracting lifelines require the entire device to be sent for repair or replacement when the lifeline becomes worn, which is inconvenient and may not be feasible in all situations, highlighting the need for a disconnectable lifeline that can be replaced in the field.
Innovation Solution
A self-retracting lifeline design featuring a housing, a drum, a lifeline, and a locking member that allows for the drum to be locked and unlocked, enabling the easy replacement of the lifeline by moving the locking member from an unlocked to a locked position, allowing the old lifeline to be disconnected and a new one to be installed without requiring the entire device to be sent for repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire self-retracting lifeline device is sent for repair or replacement when the lifeline becomes worn, then safety is maintained, but operational downtime increases and cost increases
Solution Approach 1:
The device is divided into separable components: a reusable housing containing the drum and brake assembly, and a replaceable lifeline. The lifeline can be independently removed and replaced without affecting the housing, allowing quick field maintenance that maintains safety while minimizing operational downtime.
Solution Approach 2:
The worn lifeline is discarded and replaced with a new one, while the housing and drum assembly are recovered and reused. This selective replacement approach maintains safety by removing worn components while avoiding the need to replace or send the entire device for repair.
2Reliability
If the entire self-retracting lifeline device is sent for repair when the lifeline becomes worn, then the lifeline is replaced, but repair complexity increases
Solution Approach 1:
The device structure is segmented into a housing and a lifeline system that can be independently accessed and replaced. The lifeline can be removed by simply unlocking the drum, without requiring disassembly of the housing or brake assembly, significantly reducing repair complexity.
Solution Approach 2:
The lifeline is extracted as a separate replaceable component from the housing. The replacement process involves only removing the old lifeline from the drum and installing a new one, leaving the complex housing and brake assembly intact and reusable.
3Stability of the object's composition
If the locking member is designed to securely lock the drum, then the drum remains fixed during operation, but the complexity of the locking mechanism increases
Solution Approach 1:
The locking mechanism is designed to be self-actuating through spring force. The spring automatically engages the locking member with the drum's external surface to prevent rotation during operation, and can be easily disengaged by applying force to the lifeline, providing secure locking without complex controls.
Solution Approach 2:
The locking mechanism uses simple, inexpensive components: a spring, a locking member with a simple geometric profile, and external surfaces on the drum. These basic elements provide reliable locking without requiring complex mechanisms or expensive components.
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 design allows for field replacement of the lifeline, enhancing convenience and safety by enabling workers to replace worn lifelines without needing to send the device for repair, thereby optimizing safety and reducing downtime.
Implementation Method 1
The drum is spring biased to pay out the lifeline as tension pulling the lifeline is applied and to retract the lifeline that has been unwound from the drum as the tension on the lifeline is reduced or released.
Implementation Method 2
The housing also includes a brake assembly for stopping rotation of the drum when the lifeline suddenly unwinds from the drum at a rate greater than a predetermined maximum angular velocity.
Implementation Method 3
Should a fall occur, the brake assembly within the device is automatically engaged by a centrifugal clutch assembly, which gradually and quickly stops the worker's fall by gradually and quickly stopping the rotation of the drum.
Data Source
AI summary
A self-retracting lifeline includes a replaceable lifeline and comprises a housing, a drum rotatably operatively connected to the housing, a lifeline, and a locking member operatively connected to the drum and moveable from an unlocked position to a locked position for locking the drum relative to the housing to assist in replacing the lifeline.