Gemstone Adhesion to Leather Base Layer via Recess
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Solution Overview
Problem
Existing methods for gluing gemstones, particularly those with a pointed rear side, to leather are unsatisfactory as they rely on poorly adhering dressing, leading to potential detachment under stress, as the base layer of the leather is not strongly bonded to the finish.
Innovation Solution
A method involving punching a recess in the leather smaller than the stone's diameter, expanding it conically to match the stone's contour, and gluing the stone directly to the base layer, with additional reinforcement using hot-melt adhesive and a fabric piece to enhance adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stone is glued to the dressing layer of the leather, then the gluing process is simple, but the adhesion is poor and the stone may detach under stress
Solution Approach 1:
The invention extracts the stone from the dressing layer and places it directly into a recess in the base layer of the leather. The recess is created by removing material from the base layer, allowing the stone to be embedded and glued directly to the strong base layer rather than the weak dressing layer, thus extracting the stone from the problematic attachment situation.
Solution Approach 2:
The invention performs preliminary action by creating the recess in the base layer before applying the stone. This recess preparation includes removing material to expose the base layer and creating a cavity that will receive and secure the stone, ensuring proper positioning and adhesion before the actual gluing occurs.
2Ease of operation
If a recess is punched out larger than the stone, then the stone fits easily, but the adhesion strength is reduced
Solution Approach 1:
The invention applies local quality by creating a recess with specific dimensional characteristics: the opening is smaller than the stone's largest diameter to provide mechanical interference fit, while the bottom is enlarged to accommodate the stone's pointed rear side. This localized variation in recess geometry optimizes both insertion feasibility and adhesion strength at different locations within the recess.
Solution Approach 2:
The invention uses curvature by enlarging the bottom of the cylindrical recess to create a conical or rounded cavity that matches the pointed shape of the stone's rear side. This curved enlargement at the recess bottom allows the stone to sit firmly while maintaining a tight fit at the opening, optimizing both insertion and adhesion.
3Stability of the object's composition
If the dressing layer is preserved during preparation, then the leather surface remains intact, but the stone cannot be securely attached to the base layer
Solution Approach 1:
The invention segments the leather structure by creating a localized recess that penetrates through the dressing layer and finish to expose the base layer in a specific area, while preserving the integrity of the surrounding dressing layer. This segmentation allows selective access to the base layer for stone attachment without compromising the overall leather surface.
Solution Approach 2:
The invention applies local quality by creating a localized recess that exposes the base layer only in the specific area where the stone will be attached, while the rest of the dressing layer and finish remain intact. This localized modification allows secure stone attachment to the base layer without requiring removal or damage to the overall leather surface.
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 ensures secure adhesion of the stone to the leather, preventing detachment even under stress, by bypassing the poorly adhering dressing and directly bonding the stone to the base layer, while allowing for precise placement and pattern application.
Implementation Method 1
The stone and base are connected using a hot-melt adhesive, which is activated by ironing.
Implementation Method 2
the dressing is sanded down first. In the case of stones with a flat back (cf. US 2002/0117258 A1), it has also already been proposed to destroy the dressing using ultrasound
Data Source
Figure 1~2
Figure 3~5
Figure 6
AI summary
The invention relates to a method for gluing precious stones (1) comprising a tapered rear face, especially consisting of cut glass, to leather (2), whereby a recess (5) is stamped in the leather (2) in the fixing region for each stone (1), said recess being smaller than the largest diameter of the stone (1). The end of the recess (5) facing the stone is enlarged by stamping according to the contour of the stone (1). The stone (1) is then glued (7) in the enlarged recess (6) with the base layer (4) of the leather (2).