Laminated Glazing Mounting Plate Adhesive Bonding
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Solution Overview
Problem
Existing laminated glazing with through-holes is weakened, posing a risk of failure under stress, particularly in low-speed off-road vehicles where monolithic glass is commonly used due to cost considerations, and existing solutions have not adequately mitigated this weakness.
Innovation Solution
A laminated glazing design featuring aligned holes of the same size in glass plies with a mounting plate attached using adhesive in discrete areas around the periphery, minimizing stress on the glass and avoiding additional holes for mechanical fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a through-hole is introduced in laminated glass to accommodate equipment, then the glazing can support accessories or equipment, but the glass strength and safety are weakened
Solution Approach 1:
A mounting plate is introduced as an intermediary element between the through-hole and the equipment. The mounting plate is bonded to the glazing surface using adhesive in discrete areas, and the equipment is then attached to the mounting plate. This mediator allows equipment support while minimizing direct stress concentration on the glass around the hole.
Solution Approach 2:
The patent replaces mechanical fastening systems (screws, bolts, clips) that would require additional holes or create stress concentrations in the glass with an adhesive bonding system. The adhesive is applied in discrete elongate areas adjacent to the periphery of the mounting plate, providing secure attachment while minimizing the weakening effect on the glass structure.
2Adaptability or versatility
If multiple holes of different sizes are used in glass plies to accommodate equipment, then equipment can be mounted, but manufacturing complexity and stress distribution are worsened
Solution Approach 1:
The patent employs holes of the same size in both glass plies, creating a homogeneous and simplified configuration. This uniform hole design reduces manufacturing complexity compared to using holes of different sizes, while still effectively accommodating the equipment through the mounting plate system.
3Reliability
If mechanical fasteners are used to attach equipment to glazing, then secure attachment is achieved, but additional holes are required which further weaken the glass
Solution Approach 1:
The patent substitutes mechanical fastening systems with an adhesive bonding system. The adhesive is applied in discrete elongate areas adjacent to the periphery of the mounting plate, providing secure attachment equivalent to mechanical fasteners while avoiding the need for additional holes in the glass, thereby preserving glass integrity.
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 solution provides a durable and stress-reduced laminated glazing construction that maintains integrity and safety by minimizing the weakening effect of through-holes, improving impact resistance and reducing the risk of stress cracking.
Implementation Method 1
The mounting plate is attached to the surface of the glazing by adhesive
Data Source
AI summary
A laminated glazing comprises first and second plies of glass and a ply of interlayer, the ply of interlayer extending between the plies of glass. Each ply contains a hole, the holes in the plies being aligned to form a single continuous through-hole extending through the plies of glass and interlayer. The holes are of the same size and share the same outline. A member, such as a mounting plate, is attached to a surface of the glazing so as to occupy an area of that surface, the member being positioned on that surface so that the through-hole is within the area occupied by the member. Preferably, the member is a disc attached by adhesive in discrete beads extending along circular arcs adjacent the periphery of the disc. The member may carry a wiper assembly, a shaft of which passes through the hole.