Polarized Deceleration Brake for Self-Retracting Devices
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Solution Overview
Problem
Existing safety lanyards and self-retracting devices (SRDs) often suffer from tangling, damage due to impacts, and whiplash issues during retraction, which compromise their effectiveness and safety.
Innovation Solution
A directionally polarized deceleration module (PDM) is introduced, featuring a shuttle coupled to a spring-biased spool and a dynamic braking member (DBM) that slows the lanyard's retraction while minimizing friction during extraction, preventing tangling and damage by controlling the lanyard's speed and reducing impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the lanyard is retracted quickly, then productivity is improved, but the lanyard becomes tangled and damaged
Solution Approach 1:
The patent employs a dynamic braking member that adjusts braking force based on retraction speed. The braking member is biased by a spring and can dynamically engage with the spool to provide variable resistance during retraction, allowing high-speed retraction when safe while preventing tangling and damage through controlled braking.
Solution Approach 2:
The system changes the friction parameter between the braking member and spool during operation. The braking member transitions from a low-friction state during normal extraction to a high-friction braking state during rapid retraction, controlled by the spring bias and engagement geometry with the spool flanges.
2Ease of operation
If the lanyard is extracted freely, then ease of operation is improved, but whiplash damage occurs
Solution Approach 1:
The braking member is pre-positioned and spring-biased to engage with the spool before whiplash occurs. This preliminary engagement creates resistance that prevents the lanyard from accelerating to dangerous speeds, thereby preventing whiplash damage before it can occur.
Solution Approach 2:
The spring-biased braking member acts as a cushioning element that absorbs excess kinetic energy during rapid extraction. The spring compresses to provide a cushioning force that limits maximum extraction speed and prevents impact damage to the SRD enclosure.
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 PDM effectively prevents tangling and damage to SRDs by controlling the lanyard's retraction speed and minimizing friction during extraction, enhancing the safety and reliability of personal protective equipment.
Implementation Method 1
a shuttle fixedly coupled to a spring-biased spool rotatably coupled to a module housing
Implementation Method 2
The DBM may be forced between the angled distal-end of the shuttle and an inner channel wall, for example, providing motional resistance to the tether
Data Source
AI summary
An apparatus and an associated method relates to a directionally polarized deceleration module (PDM) include a shuttle (125) fixedly coupled to a spring-biased spool (120) rotatable coupled to a module housing (115), a dynamic braking member (DBM) (130) and the shuttle (125) configured to travel inside a channel anchored to the module housing (115). A tether may be anchored on a proximal end to the spool (120). As the tether is retracted, the DBM (130) may be pushed by an angled distal-end of the shuttle (125). The DBM (130) may be forced between the angled distal-end of the shuttle (125) and an inner channel wall, providing motional resistance to the tether. As the tether is extracted, the DBM (130) may be pushed substantially normal to a proximal-end of the shuttle (125), providing minimal motional resistance to the tether. Various PDMs may decelerate safety lanyards in one direction to substantially avoid tangling and/or damage.