Frusto-Pyramidal Vent Guard to Block Birds Without Lint Buildup
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Solution Overview
Problem
Existing bird guards for dryer vents are prone to lint and dirt buildup due to multiple support bars in the airflow path, which can block the vent, while widely spaced bars may not effectively prevent bird passage.
Innovation Solution
A guard with a frusto-pyramidal shape and parallel bars of smaller diameter, spaced to prevent bird passage and minimize lint and dirt accumulation, featuring a design with no cross bars to reduce surface area and facilitate airflow, allowing easy cleaning and preventing blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple support bars are used in the guard structure, then the guard strength and bird blocking capability are improved, but lint and dirt buildup increases on the guard surfaces
Solution Approach 1:
The patent removes cross bars from the guard structure, extracting only the essential longitudinal bars needed for bird blocking while eliminating the harmful cross bars that create lint traps. This leaves only the minimum necessary structural elements that do not interfere with lint and dirt flow.
Solution Approach 2:
The guard is divided into multiple longitudinal bars spaced at specific intervals, creating segmented openings that are sufficient to block birds while minimizing total surface area. The segmentation allows lint and dirt to pass through the gaps between bars without accumulating on large continuous surfaces.
2Object-generated harmful factors
If bars are widely spaced to reduce surface area, then lint and dirt buildup is minimized, but bird passage may not be effectively prevented
Solution Approach 1:
The patent optimizes the spacing parameter between bars to a specific range that simultaneously achieves two opposing goals: spacing is wide enough to minimize lint and dirt accumulation but narrow enough to effectively block bird passage. This parameter optimization resolves the contradiction between reducing buildup and maintaining blocking effectiveness.
3Strength
If bars of larger diameter are used, then the guard strength is improved, but the surface area for lint and dirt accumulation increases
Solution Approach 1:
The patent specifies optimal bar diameter parameters that provide sufficient structural strength while minimizing surface area. By carefully selecting the diameter parameter within a specific range, the guard achieves the necessary mechanical strength to maintain its shape and blocking capability while presenting minimal surface area for lint and dirt to accumulate.
Data Source
AI summary
An external guard for placement over a vent, having front, lateral and bottom sides each formed by a plurality of generally parallel bars or rods spaced apart to block passage of a bird between bars. The bars are shaped and positioned to define a frusto-pyramidal shape for the guard. The rear side of the guard opens toward the vent. The top side of the guard has a cover. There are no cross bars across the bars along the lateral sides, the side front and the bottom side of the guard and none at the intersection of the front and bottom sides of the guard.