Caravan Window Adapter Frame With Gap-Locking Fixing Elements

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Solution Overview

Problem

Existing framed windows in caravanning vehicles are not reliably mounted and sealed, particularly under varying thermal conditions, and lack a visually appealing integration with the vehicle interior.

Innovation Solution

An adapter frame system with fixing elements that fit securely into the gap between the vehicle wall cutout and the frame window, using force-fit and form-fit mechanisms, allowing for tool-free assembly and adjustment, and incorporating a blackout system for aesthetic and functional enhancement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If Velcro or adhesive tape is used to fix the adapter frame, then the mounting process is simple, but the mounting reliability deteriorates under thermal influences

Engineering Contradiction:
Improvemounting simplicityVSAvoidmounting reliability
Core Design Contradiction:
Ease of manufactureVSReliability

Solution Approach 1:

The patent replaces the adhesive/Velcro fixing system with a mechanical fixing system using fixing elements that have a insertion portion inserted into the gap between the frame window and vehicle wall cutout, and a fixing portion that engages with the frame profile section. This mechanical engagement provides reliable mounting that is independent of temperature influences while maintaining ease of assembly through the snap-fit mechanism.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Stability of the object's composition

If the adapter frame is rigidly fixed to prevent movement, then mounting stability is improved, but adjustment capability deteriorates

Engineering Contradiction:
Improvemounting stabilityVSAvoidadjustment capability
Core Design Contradiction:
Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent implements a dynamic fixing system where the fixing elements allow the adapter frame to be adjusted in position during installation by sliding along the frame profile section, and then locked in place through the engagement of the fixing portion with the frame profile. This provides both adjustment capability during mounting and stability during operation.

Inventive Principle:
Principle #15Dynamics

3Device complexity

If traditional sealing methods are used, then manufacturing simplicity is maintained, but sealing reliability under thermal expansion deteriorates

Engineering Contradiction:
Improvesealing system complexityVSAvoidsealing reliability
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent addresses thermal expansion effects by designing the fixing elements and frame profile sections with appropriate clearance and engagement geometry that accommodates dimensional changes due to temperature variations. The gap between the frame window and vehicle wall cutout, combined with the mechanical engagement of the fixing elements, allows for thermal movement while maintaining reliable sealing.

Inventive Principle:
Principle #35Parameter changes

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

Ensures reliable mounting and sealing of framed windows, providing thermal insulation and a visually appealing integration with the vehicle interior, while allowing for easy adjustment and integration of blackout systems.

Implementation Method 1

the fixing element comprises a window mounting section with a plug-in web and at least two elastically movable barbs projecting from at least one side of the plug-in web

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 2

it can be inserted into a gap between the vehicle wall cutout and the frame window in a force-fit and/or form-fit manner

Methodology Applied
Scientific EffectForce-fit connection: Mechanical Force

Data Source

PatentEP4667251A1Adapter frame system for an assembly on the passenger compartment side of a frame window of a caravaning vehicle
Publication Date: 2025.12.24 BOS TECH SERVICES GMBH
  • EP4667251A1 patent drawingFigure 1
  • EP4667251A1 patent drawingFigure 2~3
  • EP4667251A1 patent drawingFigure 4

AI summary

1. Adapter frame system for an interior mounting on a framed window of a caravanning vehicle. 2.1 Such an adapter frame system is known, comprising an adapter frame with at least three frame profile sections connected to each other at their corners, and a fixing device for attaching the adapter frame relative to the framed window and relative to a vehicle wall opening in which the framed window is mounted. 2.2 According to the invention, at least one fixing element can be mounted on the rear side of each frame profile section of the adapter frame, designed such that the fixing element can be inserted into a gap between the vehicle wall opening and the framed window in a force-fit and/or form-fit manner.