Roofing Panel Retaining Clip with Segmented Hook Elements
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Solution Overview
Problem
Existing retaining clips for roofing panels pose risks of injury during handling due to pointed projections and cause damage to the panels over time due to wind-induced movement, leading to inadequate holding and potential material grooving.
Innovation Solution
A retaining clip with a second leg featuring a hook area angled more than 90°, forming a long contact edge with slots dividing it into multiple hook elements, which adapt to the panel's underside, eliminating sharp points and ensuring secure attachment without damaging the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pointed projections are used on the second leg to prevent removal of the retaining clip, then the holding security is improved, but the risk of injury to the assembler and damage to the roofing panel increases
Solution Approach 1:
The second leg is divided into multiple hook elements (at least two) spaced apart along its length, transforming a single pointed projection into multiple distributed contact points. This segmentation maintains holding security through distributed engagement while eliminating concentrated sharp points that cause injury and damage.
Solution Approach 2:
Instead of using pointed projections extending outward from the second leg, the invention inverts the approach by creating hook elements that bend toward the web, forming a hook area angled more than 90°. This inversion transforms harmful sharp points into safe, rounded contact surfaces that engage the roofing panel underside without causing injury or damage.
2Reliability
If pointed projections are used to secure the retaining clip, then the initial attachment is improved, but long-term reliability deteriorates due to material grooving and bending
Solution Approach 1:
The second leg is divided into multiple hook elements (at least two) spaced apart along its length, transforming a single pointed projection into multiple distributed contact points. This segmentation maintains holding security through distributed engagement while eliminating concentrated sharp points that cause injury and damage.
Solution Approach 2:
Instead of using pointed projections extending outward from the second leg, the invention inverts the approach by creating hook elements that bend toward the web, forming a hook area angled more than 90°. This inversion transforms harmful sharp points into safe, rounded contact surfaces that engage the roofing panel underside without causing injury or damage.
3Device complexity
If a single continuous second leg is used, then the structural simplicity is maintained, but the adaptability to panel irregularities is reduced
Solution Approach 1:
The second leg is divided into multiple hook elements (at least two) spaced apart along its length, transforming a single pointed projection into multiple distributed contact points. This segmentation maintains holding security through distributed engagement while eliminating concentrated sharp points that cause injury and damage.
Solution Approach 2:
The hook elements are formed with a hook area angled more than 90° relative to the second leg, allowing them to flex and adapt to irregularities in the roofing panel underside. This dynamic configuration enables the retaining clip to accommodate panel variations while maintaining secure engagement.
Data Source
Figure 1~4
Figure 5~6
Figure 7
AI summary
The clamp (1) has a bracket (4) with a hook region, which is aligned with two ends towards a connecting rod. The hook region forms an elongate installation edge for installation at a lower side of a roof cover plate, where the edge corresponds to breadth of the bracket. The hook region is subdivided into hook elements (10-12) by a slot (9), which is opened towards free hook ends and is aligned parallel to margin edges of the bracket. The slot runs over entire length of the hook region and over a length of the bracket up to the rod. The clamp is made of a sheet metal strip.