Roofing Shingle Uneven Edge Cut Randomized Pattern
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Solution Overview
Problem
Conventional roofing shingles fail to effectively simulate the random appearance of natural wood shake shingles when assembled, particularly when viewed diagonally, due to periodicity in the pattern.
Innovation Solution
The development of a multitab roofing shingle with uneven edge profiles and non-aligned slots between complementary shingles, creating a segmented join line with symmetry elements, which allows for a more randomized and natural appearance when assembled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional strip shingles with multiple tabs of differing widths are used, then the appearance of random widths and lengths is improved, but periodicity in the pattern becomes detectable when viewed diagonally
Solution Approach 1:
The patent applies asymmetry by creating an uneven edge profile along the join line where tabs of adjacent shingles do not align. Specifically, the edge profile includes portions that extend beyond and recede from the adjacent shingle's edge, breaking the symmetry and periodicity that would otherwise be visible in diagonal views. This asymmetric design ensures that no regular pattern emerges when shingles are assembled in overlapping courses.
2Shape
If mirror image pairs of strip shingles are used to improve randomness, then the variety of shapes is increased, but the assembly complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies universality by designing a single shingle type that can be used in all positions and orientations within the roof assembly. The asymmetric edge profile and multiple tabs of differing widths are incorporated into a universal shingle design that does not require pairing with mirror image counterparts. This single versatile shingle design simplifies manufacturing and assembly while still achieving the desired random appearance when installed in overlapping courses.
3Shape
If multiple tabs of differing widths are incorporated along the lower exposed surface, then the simulation of natural slate or wood shingle appearance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by varying the dimensions of different tabs along the shingle's exposed surface. Each tab has different widths and lengths tailored to specific locations, creating a more realistic natural shingle appearance. The asymmetric edge profile also features local variations where portions extend and recede at different positions. This localized differentiation achieves high-fidelity simulation without requiring excessive manufacturing precision across the entire shingle.
Data Source
AI summary
A roofing shingle has side edges, an upper unexposed area, and a lower exposed area. The lower exposed area has a lower edge. The lower edge can include an uneven profile. The uneven profile can include a symmetry element. The symmetry element can only pertain to the course of the uneven profile.