Tactile Indicator Manufacturing via Plastic Deformation and Lathing
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Solution Overview
Problem
Existing tactile ground surface indicators lack efficient manufacturing methods that ensure secure anchorage and slip resistance, particularly for blind and vision-impaired pedestrians.
Innovation Solution
A method of manufacturing tactile ground surface indicators involving plastic deformation of metal plates to form dish-shaped pieces with a grip and a downwardly projecting stem, where the stem is interlocked with the head using a plug portion and void configuration, and a casing is applied to secure the indicator to the ground surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If plastic deformation and lathing methods are used to manufacture tactile ground surface indicators, then manufacturing precision and structural integrity are improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple manufacturing operations into an integrated process. The punch tool both cuts the circular section from the metal plate and simultaneously plastic deforms it into the dish-shaped head in one operation, merging cutting and forming processes. The lathing process then machines both the exterior profile and the grip features in a unified machining sequence, reducing the number of separate manufacturing steps while maintaining high precision.
Solution Approach 2:
The patent performs preliminary plastic deformation to form the dish-shaped head before final machining operations. By pre-forming the basic shape and structural features through deformation, the subsequent lathing operations only need to refine the exterior profile and add surface features, reducing the complexity and time of final precision machining.
2Ease of operation
If the head is made with a smooth inclined peripheral side face, then ease of cleaning is improved, but slip resistance is worsened
Solution Approach 1:
The patent applies different surface qualities to different regions of the head. The peripheral side face is machined smooth for ease of cleaning and aesthetic purposes, while the upper surface is lathed to create a grip pattern with enhanced friction characteristics. This local differentiation allows each surface to optimize its function: smooth sides for cleaning and asymmetric top surface for slip resistance.
Solution Approach 2:
The patent creates an asymmetric grip pattern on the upper surface through lathing operations. The grip features include concentric rings or radial patterns that are not symmetrically uniform, providing enhanced friction in multiple directions while maintaining a smooth inclined peripheral side face. The asymmetric machining pattern ensures slip resistance without compromising the cleanability of the peripheral surfaces.
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 provides secure anchorage and enhanced slip resistance, ensuring the indicator remains fixed over the ground surface while being easy to manufacture and comply with relevant standards.
Implementation Method 1
plastically deforming a section of metal plate to form a dish-shaped piece
Implementation Method 2
lathing an exterior of the dish-shaped piece whereby an external profile of said head is formed, the lathing comprising lathing an upper surface of said piece
Implementation Method 3
the element is configured with a plug portion (6A) which is formed at an upper end of said end portion and sized so as to be incapable of passing through said opening such that withdrawal of the downwardly projecting member from the head or piece in a direction from the plug portion to the opening is precluded
Implementation Method 4
the head or piece is plastically deformed such that material of which the head or piece is comprised flows into said void to occupy it
Implementation Method 5
tactile ground surface indicators comprise protuberances which are fixed over walking surfaces... to warn blind and vision-impaired pedestrians
Data Source
Figure 1~3A
Figure 3B~5
Figure 6~8
AI summary
There is disclosed a method of manufacturing a tactile ground surface indicator which comprises a head configured to lie fixed over a ground surface, the method comprising plastically deforming a section of metal plate to form a dish shaped piece and machining an exterior of the dish-shaped piece whereby an external profile of said head is formed. There is also disclosed a method of manufacturing a tactile ground surface indicator having a head and a downwardly projecting member connected to the head to be fixedly receivable by a cavity formed through the ground surface for anchoring the head over a ground surface, in which method an element defining the downwardly projecting member or from which that member is derived is positioned such that an end portion thereof extends through an opening formed through either the head or a piece from which is derived an exterior portion of the head arranged to be visibly exposed when the head is anchored, and plastic deformation of the end portion and/or piece is effected to create an interlock between the piece and element.