Roofing Clip With Triangular Constraint Resists Wind Suction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing metal clips used for fastening roofing panels and tiles are prone to loosening and detachment due to wind suction forces, and face difficulties in assembly, especially in narrow gaps between the roof batten and formwork or underlay.
Innovation Solution
The clip design features a U-shaped first end part with a free leg supported on the roof batten's side surface, and a V-shaped bend leading to a coaxial second area, ensuring a secure fit by preventing rotation and allowing easy assembly by pulling the bending arm parallel to the batten, even in gaps up to 24 mm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional clip with a bending arm is used to fasten roofing panels, then the clip can be attached to the roof batten, but wind suction forces cause the roof panels to be lifted off and the clip to detach from the batten
Solution Approach 1:
The first end part of the clip is divided into multiple contact regions: a base area for the underside of the batten, a free leg for one side surface, and another leg for the opposite side surface. This segmentation distributes the wind suction forces across multiple attachment points, preventing detachment while maintaining reliable fastening.
Solution Approach 2:
The clip transitions from a single-plane bending arm design to a three-dimensional configuration where the first end part extends in multiple directions (base area, free leg, and other leg) to contact different surfaces of the batten. This dimensional expansion allows the clip to resist wind suction forces from multiple angles simultaneously.
2Device complexity
If a conventional clip design is used, then the structure is simple, but assembly is difficult in narrow gaps between formwork/underlay and roof batten (24 mm or less)
Solution Approach 1:
The clip's first end part is designed with flexible legs that can dynamically adjust their position and orientation during assembly. The free leg and other leg can pivot and bend to navigate through narrow gaps, allowing the installer to attach the clip even in constrained spaces of 24 mm or less, while maintaining structural integrity once assembled.
3Ease of operation
If a conventional clip with considerable play between the batten and first end part is used, then the clip can be easily assembled, but the hooking becomes loose and the clip rotates around the batten under load
Solution Approach 1:
Different regions of the first end part have specialized functions: the base area provides a stable foundation on the batten underside, the free leg creates a triangular constraint on one side, and the other leg constrains the opposite side. This local differentiation of qualities ensures both easy assembly and stable, rotation-resistant connection under load.
Solution Approach 2:
The triangular free space formed by the base and free leg预先 creates a geometric constraint that prevents rotation before loads are applied. The other leg further reinforces this anti-rotation mechanism, so that when wind suction forces act on the roofing panel, the clip cannot rotate or become loose around the batten.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The clip (1) is made of metal, for e.g. metal sheet, particularly made of wire. A U-shape end part (4) is provided with a base (7), which underneath a dimensioned roof slat (3) in an assembly of a lower side (10). A triangular free space is provided in the corner area between the base and a bracket (8). Two areas (12,15) of the assembly are lying at a side surface (17) of the roof slat over its entire length.