Fall Protection Shuttle With Angle-Responsive Secondary Braking
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Solution Overview
Problem
Existing fall protection devices lack effective redundant safety mechanisms to prevent premature activation of brake assemblies due to angled configurations, which can lead to malfunction or increased risk during falls.
Innovation Solution
A secondary brake assembly with a secondary brake lock arm that rotates independently of the shuttle housing to an engaged position, obstructing the secondary brake pawl from activating during angled configurations, supplemented by a first brake assembly for immediate stopping force during falls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a secondary brake assembly is added to provide redundant safety, then fall protection reliability is improved, but device complexity increases
Solution Approach 1:
The brake system is segmented into a first brake assembly and a secondary brake assembly, each with independent brake pawls and actuation mechanisms. This segmentation allows the secondary brake to provide redundant safety without requiring complete redesign of the primary brake system, thereby improving reliability while managing complexity through modular architecture.
Solution Approach 2:
The secondary brake assembly is pre-configured with a brake pawl and actuation mechanism that automatically engages under specific conditions (angled configurations). This preliminary preparation ensures that when a fall occurs, the secondary brake is already positioned to provide immediate redundant protection, enhancing reliability without requiring complex real-time decision systems.
2Measurement precision
If the secondary brake pawl is configured to rotate during fall instances, then fall detection capability is improved, but risk of premature activation increases
Solution Approach 1:
The secondary brake lock arm is pre-positioned to obstruct the secondary brake pawl during angled configurations, preventing premature activation. This preliminary counter-action blocks the harmful effect of unintended brake engagement while allowing the pawl to rotate freely during genuine fall instances, thus maintaining accurate fall detection capability.
Solution Approach 2:
The secondary brake lock arm is configured to dynamically adjust its position based on the angle of the guide member. During angled configurations, the lock arm rotates to obstruct the pawl; during vertical fall instances, the lock arm moves away to allow pawl rotation and brake activation. This dynamic behavior enables precise fall detection while preventing false activation.
3Reliability
If the secondary brake lock arm rotates independently to obstruct the pawl during angled configurations, then false activation prevention is improved, but device complexity increases
Solution Approach 1:
The secondary brake lock arm utilizes the gravitational force and geometric relationship with the guide member angle to automatically rotate into the obstructing position during angled configurations. This self-service mechanism prevents false activation without requiring external actuators, sensors, or control systems, thereby improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The secondary brake lock arm acts as an intermediary element between the guide member angle and the secondary brake pawl. It translates the angular position of the guide member into a mechanical obstruction that prevents pawl rotation during angled configurations, providing a simple yet effective solution to prevent false activation without complex control systems.
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 secondary brake assembly provides a redundant safety mechanism that prevents premature activation during angled configurations, ensuring reliable fall protection by maintaining the brake assembly in a disengaged position until a genuine fall event occurs, enhancing user safety.
Implementation Method 1
a lock arm center of gravity of the secondary brake lock arm may be defined at least substantially directly below the lock arm axis of rotation
Implementation Method 2
a secondary brake pawl configured to pivotably rotate about a secondary brake pawl pivot pin between a disengaged position and an activated position
Data Source
AI summary
Various embodiments are directed to shuttle apparatuses for fall protection and methods of using the same. In various embodiments, a shuttle apparatus comprises a shuttle housing configured for dynamic engagement relative to a guide member, a first brake assembly configured for activation during a fall instance, and a secondary brake assembly configured independent from the first brake assembly, the secondary brake assembly comprising: a secondary brake pawl configured to pivotably rotate between a disengaged position and an activated position, the secondary brake pawl configured to rotate toward the activated position during the fall instance; and a secondary brake lock arm configured to freely rotate independent of the shuttle housing such that the shuttle housing being arranged in an angled configuration causes the secondary brake lock arm to rotate to an engaged position to obstruct the secondary brake pawl from rotating, thereby preventing the secondary brake assembly from being activated.