Fall Arrest Device Restoring Spring Segmented Fixing Rod
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Solution Overview
Problem
Conventional fall arrest devices may experience unreliable operation due to the disengagement of the restoring spring from the fixing rod, leading to a loss of safety locking effect and inability to pull out the safety belt during falls.
Innovation Solution
The fall arrest device incorporates a brake wheel with a fixing rod having a first segment and a second segment, where the outer diameter of the first segment is greater than the inner diameter of the restoring spring's ring, ensuring the ring is restricted to the second segment and preventing disengagement from the fixing rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the restoring spring is connected to the fixing rod with a simple ring structure, then the device complexity is reduced, but the reliability deteriorates due to potential disengagement
Solution Approach 1:
The fixing rod is divided into two segments with different outer diameters: a first segment with a larger outer diameter and a second segment with a smaller outer diameter. The restoring spring's ring is configured to fit around the second segment. This segmentation prevents the ring from disengaging while maintaining structural simplicity.
Solution Approach 2:
Different portions of the fixing rod have different local qualities (different outer diameters). The first segment has a larger diameter for structural strength, while the second segment has a smaller diameter specifically for engaging the restoring spring ring. This local differentiation solves the disengagement problem without complicating the overall structure.
2Ease of operation
If the restoring spring is allowed to move freely on the fixing rod, then the ease of operation is improved for maintenance, but the reliability deteriorates due to shaking and potential disengagement during use
Solution Approach 1:
The fixing rod is segmented into two portions with different diameters. The restoring spring ring fits around the second segment, creating a secure fit that prevents shaking and disengagement during operation, while still allowing for maintenance when needed.
Solution Approach 2:
The second segment of the fixing rod acts as an intermediary element between the restoring spring ring and the first segment. It provides a specific engagement interface that secures the ring in place during operation while maintaining accessibility for maintenance purposes.
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 enhances the reliability of the fall arrest device by preventing the restoring spring from disengaging from the fixing rod, maintaining the safety locking effect and ensuring continuous operation during falls.
Implementation Method 1
a restoring spring (42) having a first end (422) connected to the brake wheel (30), and a second end (424) connected to the brake block (40), wherein the restoring spring (42) normally drives the brake block (40) to remain in a restoring position
Implementation Method 2
the stop portion (404) of the brake block (40) is spun out with a centrifugal force generated by a rotation of the brake wheel (30) to abut against the stopper (182a) so as to limit a rotation of the rotating member (24)
Data Source
AI summary
A fall arrest device includes a bracket, a rotating member rotatably mounted to the bracket, a safety belt wound around the rotating member, a brake wheel connected to the rotating member, a brake block pivotally connected to the brake wheel, and a restoring spring fitting around the second segment and having one end thereof terminating in a ring that has an inner diameter smaller than an outer diameter of the first segment. Another end of the restoring spring is connected to the brake block. The brake wheel has a fixed rod having a first segment and a second segment. An outer diameter of the first segment is greater than an outer diameter of the second segment. The restoring spring urges the brake block to be located in a restoring position. Thus, the restoring spring could be prevented from falling out of the fixing rod.