In-Plane Window Socket Sealing for Variable Gap Openings

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Solution Overview

Problem

Existing window seals struggle to reliably seal against dimensional deviations in window openings, leading to unpredictable gaps and compromised sealing effectiveness, especially when profile seals are not commercially available or require complex, costly manufacturing.

Innovation Solution

A base seal design featuring flat seals that attach to the front surfaces of the window frame and sill, allowing for easy installation and adaptation to varying gap widths, using flat gaskets or self-adhesive materials to ensure a reliable seal, and optionally supplemented with pasty sealants for additional moisture barriers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If profile seals are used to seal against dimensional deviations, then sealing effectiveness is improved, but manufacturing complexity and cost increase

Engineering Contradiction:
Improvesealing effectivenessVSAvoidmanufacturing complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs flat seals in the form of thin, flexible films that can conform to varying gap dimensions. These flat seals are bonded to the base seal and window frame, creating an adaptable sealing solution that does not require complex profiled structures. The thin film nature allows easy manufacturing while maintaining sealing effectiveness against moisture penetration.

Inventive Principle:
Principle #30Flexible shells and thin films

2Reliability

If profile seals with complex cross-sections are manufactured, then sealing reliability is improved, but manufacturing cost increases

Engineering Contradiction:
Improvesealing reliabilityVSAvoidmanufacturing cost
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The invention replaces expensive, complex profile seals with inexpensive flat sealing films. These flat seals can be easily manufactured and applied, providing reliable sealing without the high manufacturing costs associated with precision-molded profile seals. The simplicity of the flat seal design makes it economically advantageous while maintaining functional effectiveness.

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

3Ease of manufacture

If flat seals are used instead of profile seals, then ease of manufacture and cost are improved, but adaptability to gap variations may worsen

Engineering Contradiction:
Improveease of manufactureVSAvoidadaptability to gap variations
Core Design Contradiction:
Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The flat seals are designed with dynamic adaptability through their bonding arrangement. The seals are bonded to both the base seal and the window frame, creating a flexible connection that can accommodate dimensional deviations and gap variations. This dynamic configuration allows the flat seal to adjust to different gap widths while maintaining sealing integrity, overcoming the static nature of traditional profile seals.

Inventive Principle:
Principle #15Dynamics

4Reliability

If seals are positioned close to the reveal surface, then sealing effectiveness is improved, but available installation space is reduced

Engineering Contradiction:
Improvesealing effectivenessVSAvoidinstallation space
Core Design Contradiction:
ReliabilityVSArea of stationary object

Solution Approach 1:

The invention transitions from positioning seals in the traditional lateral space next to the reveal to bonding flat seals directly to the front surfaces of the window frame and sill. This dimensional shift allows the sealing function to be achieved in a different spatial arrangement, maintaining effective sealing while minimizing interference with the reveal surface and maximizing available installation space.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

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 design provides a cost-effective, reliable seal that adapts to dimensional variations, ensuring effective moisture prevention without complex manufacturing, even in confined spaces, and maintains sealing integrity over time.

Implementation Method 1

flat seals that attach to the front surfaces of the window frame and sill

Methodology Applied
Scientific EffectAdhesive bonding: Adhesive

Implementation Method 2

using flat gaskets or self-adhesive materials to ensure a reliable seal

Methodology Applied
Scientific EffectSelf-adhesion: Adhesive

Data Source

PatentEP4365400B1In-plane socket sealing and window assembly
Publication Date: 2026.03.04 FUNKE KUNSTSTOFFE GMBH
  • EP4365400B1 patent drawingFigure 1
  • EP4365400B1 patent drawingFigure 2
  • EP4365400B1 patent drawingFigure 3a~3b

AI summary

In the case of a base seal (1) comprising a floor surface (3), a reveal surface (4), and a wall surface (5), and with a horizontal seal (2) on the wall surface (5) and an vertical seal (2) near the reveal surface (4), it is proposed that the two seals (2) are designed to seal in the same plane, this plane being parallel to the wall surface (5) of the base seal (1). Furthermore, a window assembly (100) with the base seal (1) and a method for mounting the window assembly (100) are proposed.