Hot-Melt Adhesive Stone Setting for Dimensional Tolerance
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Solution Overview
Problem
Conventional methods for setting stones, such as diamonds, in jewelry or timepieces require precise dimensional accuracy, making them incompatible with low-cost, serially produced stones that have higher precision cuts, as they cannot accommodate inevitable dimensional variations.
Innovation Solution
A method involving a hot-melt adhesive layer on a substrate, where the stone is positioned and heated to sink partially into the adhesive, allowing a metallic layer to be deposited around the girdle, enabling the stone to be mounted without pre-formed housings, thus accommodating dimensional variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional claw or bezel setting methods are used, then the stone can be securely mounted, but the method requires high dimensional accuracy (about 5/100) in stone cutting which is incompatible with serially produced stones
Solution Approach 1:
The invention changes the parameter of stone positioning from fixed-dimensional requirements to flexible thermal bonding. By using a hot-melt adhesive layer that can be heated and softened, the system accommodates dimensional variations in stones while maintaining secure mounting, thus resolving the contradiction between manufacturing precision requirements and serial production compatibility
Solution Approach 2:
The hot-melt adhesive layer acts as an intermediary between the stone and the mounting substrate. This intermediary material provides flexibility in accommodating dimensional variations of the stone while ensuring secure attachment, eliminating the need for high precision stone cutting dimensions
2Reliability
If pre-formed housings are created to receive stones, then the stone can be securely set, but the process becomes complex and cannot accommodate dimensional variations
Solution Approach 1:
The invention extracts the housing formation step from the traditional setting process. Instead of creating pre-formed housings to receive the stones, the method uses a hot-melt adhesive layer that directly bonds the stone to the substrate, simplifying the process while maintaining secure mounting
Solution Approach 2:
The hot-melt adhesive layer provides a dynamic bonding mechanism that can adapt to dimensional variations in stones. The layer can be heated to soften and then solidify around the stone, creating a flexible yet secure mounting without requiring rigid pre-formed housings
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
This method allows for flexible stone mounting without needing pre-formed housings, accommodating dimensional variations and enabling the use of stones with higher precision cuts, enhancing the adaptability and cost-effectiveness of stone setting in jewelry and timepieces.
Implementation Method 1
heating the hot-melt adhesive layer
Implementation Method 2
sufficiently softened hot-melt adhesive layer
Implementation Method 3
depositing a metallic layer in said peripheral free space by galvanic growth from the setting sheet
Implementation Method 4
providing a substrate comprising a hot-melt adhesive layer
Data Source
AI summary
A method for assembling a stone on to a mounting includes sinking the stone into an adhesive layer on a substrate and then positioning a setting sheet around the stone above the adhesive layer so as to form a peripheral free space between the setting sheet and the stone, at least at the level of the girdle and of areas of the crown and the pavilion adjacent to the girdle. Then, a metallic layer is deposited in the peripheral free space from the setting sheet, at least at the level of the girdle and of the areas of the crown and the pavilion adjacent to the girdle, such that the metallic layer and the setting sheet form the mounting.