Detectable Warning Mat with Tapered Holes

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Solution Overview

Problem

Existing detectable warnings on walking surfaces, such as truncated dome patterns, face challenges in uniformity and durability, particularly in areas where pedestrian paths merge with vehicular paths, requiring innovative methods for consistent and recognizable hazard alerts for individuals with vision impairments.

Innovation Solution

A method involving a mat with through holes of varying diameters is used to create raised detectable warnings on substrate surfaces by injecting a viscous substance that cures into a solid, forming truncated domes with inclined peripheral surfaces for enhanced durability and recognition, compliant with ADA Accessibility Guidelines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional methods are used to form detectable warnings, then the surface pattern can be created, but the uniformity and durability of the truncated dome pattern deteriorates

Engineering Contradiction:

Improveuniformity of truncated dome patternVSAvoiddurability of detectable warnings

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The mat is prepared in advance with precisely engineered through-holes arranged in the required truncated dome pattern. This preliminary preparation ensures that when the viscous substance is injected and the mat is removed, the detectable warnings are formed with consistent uniformity and geometry, directly addressing the uniformity requirement of ADA specifications.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The through-holes in the mat are designed with specific dimensional parameters - varying diameters at different depths to create the truncated dome shape. By controlling the hole dimensions, spacing, and depth, the method achieves precise geometric consistency in the formed warnings, improving manufacturing precision while ensuring durability through proper dimensional design.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If detectable warnings are formed on surfaces where pedestrian paths merge with vehicular paths, then hazard alerts are provided, but the durability deteriorates due to increased traffic and wear

Engineering Contradiction:

Improvehazard alert effectivenessVSAvoiddurability under traffic conditions

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The detectable warnings are formed with inclined peripheral surfaces that create a localized durable structure. The truncated dome geometry with inclined sides provides enhanced resistance to wear and damage in high-traffic areas where pedestrian and vehicular paths intersect, directly addressing the durability challenge in these critical locations.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The truncated dome pattern with curved inclined surfaces provides superior durability compared to flat or sharp-edged patterns. The curved geometry distributes stress more effectively and resists damage from traffic loads, making the warnings more durable in areas subject to heavy use and environmental exposure.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Measurement precision

If the upper mat opening is larger than the lower mat opening to form raised warnings, then the detectable warnings become more recognizable, but the manufacturing complexity increases

Engineering Contradiction:

Improverecognizability of hazard patternVSAvoidmat through hole structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The through-holes are segmented into upper and lower portions with different diameters. This segmentation allows the mat to be manufactured as a single piece with integrated varying hole geometries, achieving the raised truncated dome effect without requiring multiple separate components or complex assembly steps, thus managing manufacturing complexity while improving recognizability.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The method ensures consistent and durable detectable warnings that are recognizable under various conditions, providing effective hazard alerts for individuals with vision impairments while adhering to ADA specifications.

Implementation Method 1

injecting into the mat through holes a viscous substance having the ability to cure into a solid

Methodology Applied

Scientific EffectCuring: Phase Change

Data Source

PatentUS7799379B2Method of forming detectable warnings on surfaces and products thereof

Publication Date: 2010.09.21 VANGUARD ADA SYST OF AMERICA

AI summary

The present disclosure provides a method for producing detectable warnings (16) on substrate surfaces (14), which includes providing a mat (30) with a top surface (38) and a bottom surface (36) and a pattern of mat through holes (34) extending through the mat (30). The through holes (34) comprise a lower portion (44) defining a lower mat opening (33) and an upper portion (32) defining an upper mat opening (35), wherein the upper mat opening (35) is larger in transverse dimension than the lower mat opening (33). The method further includes placing the mat (30) on a substrate surface (14), wherein the bottom surface (36) of the mat (30) is adjacent the substrate surface (14), and injecting into the mat through holes (34) a viscous substance (40) having the ability to cure into a solid. The method further includes removing the mat (30) at the appropriate time to form raised detectable warnings (16) on the substrate surface (14).