Pivotable Safety Ring with Limited Angle for Wall Protection
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Solution Overview
Problem
The existing safety systems with pivotably connected safety rings often cause snap hooks to damage or soil building walls due to improper orientation during use.
Innovation Solution
A safety eyelet design with a pivotable safety ring whose pivoting angle range is limited to less than 180°, specifically between ±60° and ±45°, using plastic stops that release the limitation under increased load, allowing the ring to pivot freely when a person's weight is applied, thus preventing wall contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the safety ring is made pivotable with a bearing axle to ensure correct loading, then the reliability of the safety system is improved, but the snap hook regularly contacts the building wall causing damage or soiling
Solution Approach 1:
The patent changes the parameter of pivoting angle range from unlimited (or >180°) to limited (less than 180°, specifically ±60° or ±45°). This parameter change resolves the contradiction by maintaining the safety ring's ability to pivot for correct loading while preventing excessive pivoting that causes wall contact. The stopping elements define the angular parameter limits to achieve both reliability and wall protection.
Solution Approach 2:
The safety ring maintains its dynamic pivotability feature but with constrained range. The bearing axle allows rotation while stopping elements create a dynamic system where the ring can move within safe angles but is prevented from moving into positions that cause wall damage. This dynamic constraint resolves the contradiction between needing movement for correct loading and preventing harmful contact.
2Object-affected harmful factors
If the pivoting angle range is limited to less than 180° to prevent wall contact, then the damage or soiling of building wall is reduced, but the safety ring may not always be correctly loaded
Solution Approach 1:
The patent establishes specific angular parameter ranges (±60° or ±45°) that are sufficient for correct loading while preventing wall contact. The stopping elements are positioned to define these parameters, ensuring the safety ring can achieve the necessary orientation for proper loading without exceeding angles that would cause harmful wall contact.
Solution Approach 2:
The patent provides more than the minimum required pivoting range (±60° or ±45° exceeds what would be minimally needed for correct loading) while still preventing harmful action. This partial action approach ensures reliable loading in all practical situations without granting excessive freedom that would cause wall damage.
3Object-affected harmful factors
If stops are used to limit the pivoting angle range, then the building wall is protected from damage, but the stops themselves may fail under increased load
Solution Approach 1:
The stopping elements are designed as inexpensive plastic components that can fail or be replaced if needed. They serve as sacrificial elements that protect the more valuable safety ring and building wall from damage. If the stops fail under extreme load, the loss is minimal compared to damage to the safety system or building structure.
Solution Approach 2:
The plastic stopping elements act as cushioning components that absorb or manage extreme loads before they can damage the safety ring or building wall. They provide a fail-safe mechanism that protects the system by being the weakest link, designed to fail safely rather than cause catastrophic damage.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Securing lug (1) having a bolt (3) and a securing ring (4) which is connected pivotably to the bolt, as a result of which the pivoting-angle range of the securing ring (4) is limited to less than 180°.