Bevel Tip Fixing Part for Membrane Penetration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fixing parts for insulating and waterproofing membranes in building roofs face difficulties in penetrating the membrane without causing deformations and ensuring proper welding, due to the resistance of the membrane and the dense nature of insulation materials, leading to potential leaks and costly replacements.
Innovation Solution
A fixing part with a radially extending retaining head and a tubular shaft featuring a beveled tip and outer ribs, which facilitates clean cuts in the membrane and reduces deformation, allowing easier penetration and subsequent welding without the need for pre-mounted screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the fixing part forces through the waterproofing membrane, then penetration is achieved, but strong deformations and permanent folds are created in the membrane
Solution Approach 1:
The fixing part is divided into multiple functional zones: a cutting zone with lateral edges for clean membrane cutting, a beveled zone for gradual insulation penetration, and a cylindrical zone for screw engagement. This segmentation allows different actions (cutting, piercing, expanding) to occur in sequence, preventing membrane deformation.
Solution Approach 2:
The lateral cutting edges perform a preliminary cutting action on the waterproofing membrane before the main body penetrates. This pre-cleaning of the membrane edge prevents folding and deformation during the subsequent penetration process, ensuring the membrane remains flat and weldable.
2Ease of manufacture
If the outer surface of the barrel is smooth, then manufacturing is simplified, but the fixing part rotates when screwing in the screw
Solution Approach 1:
The barrel surface has localized ribs protruding from its outer surface, creating local friction zones while maintaining overall surface simplicity. These ribs provide rotational stability through increased friction with the membrane, without requiring complex surface treatments or patterns across the entire barrel.
3Ease of operation
If the fixing part uses a pointed end to pierce the membrane, then penetration is facilitated, but the membrane resistance causes strong deformations
Solution Approach 1:
The pointed end is segmented into lateral cutting edges that run along the beveled surface. These edges perform a shearing cutting action rather than blunt forcing, enabling easy penetration while preserving membrane integrity and preventing folds.
Solution Approach 2:
The beveled surface creates a gradual transition in diameter from the cylindrical portion to the pointed end, changing the geometric parameters progressively. This gradual tapering reduces stress concentration and membrane deformation during penetration, while the lateral edges maintain cutting effectiveness.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention relates to a bevel part for an insulating material and a sealing membrane, to be used with a screw and comprising a holding head (4) which is provided with an axial opening and is fixed to a tubular shank (5) ending coaxially to said opening. The shank (5) is generally cylindrical, receives the screw used, and has an inner diameter which is at least equal to that of the head of the screw. It has an end (6) which is pointed in such a way as to pierce a sealing membrane and to penetrate a thermal, phonic, or other, insulating layer. The pointed form of the shank (5) is shaped into a bevel and therefore has a bevelled surface bordered by two cutting edges (17a, 17b) converging towards a convergence point located on the end of the pointed form of the shank. The shank comprises a main projecting rib (13a) extending from the holding head (4) to the convergence point of the two edges (17a, 17b).