Window and Door Fitting Assembly With Preloaded Guide Spring

Solution Overview

Problem

Existing window and door systems with lifting-off and shifting movements suffer from play and rotational issues during the guidance of the leaf away from the fixed frame, particularly perpendicular to the frame main plane.

Innovation Solution

A pre-tensioned spring element is introduced between the leaf-side and fixed-frame-side transverse guide parts to ensure play-free support, minimizing movement play and rotational issues by maintaining a constant tension during shifting and lifting-off movements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional guide system is used for lifting-off and shifting movements, then the leaf can be moved relative to the fixed frame, but play and rotational issues occur during guidance perpendicular to the frame main plane

Engineering Contradiction:

Improveguidance stabilityVSAvoidmovement smoothness

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The spring element is pre-tensioned before the lifting-off movement begins, establishing constant guidance tension throughout the entire movement range. This preliminary action ensures that the control link and link follower maintain continuous contact without play, resolving the guidance stability issue while enabling smooth operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The spring element's pre-tensioning force is optimized to provide sufficient guidance stability without creating excessive friction or resistance. By carefully adjusting the spring parameter (pre-tensioning force), the system achieves reliable guidance while maintaining ease of operation during the lifting-off and shifting movements.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the control link extends with increasing distance from the frame main plane during lift-off, then the lifting-off movement is achieved, but play occurs perpendicular to the frame main plane

Engineering Contradiction:

Improveguidance precisionVSAvoidcontrol link geometry

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The spring element acts as an intermediary between the control link and link follower, maintaining constant contact force throughout the movement. This mediator ensures that the varying geometry of the control link does not create play, as the spring continuously pushes the link follower against the control link surface, achieving precise guidance despite the complex link geometry.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If the transverse guide parts are movably connected for lifting-off movement, then the leaf can be lifted off from the fixed frame, but rotational movement and play occur during shifting

Engineering Contradiction:

Improvemovement capabilityVSAvoidguidance accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The spring element's pre-tensioning force is optimized to provide sufficient guidance stability without creating excessive friction or resistance. By carefully adjusting the spring parameter (pre-tensioning force), the system achieves reliable guidance while maintaining ease of operation during the lifting-off and shifting movements.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The spring element is pre-tensioned before the lifting-off movement begins, establishing constant guidance tension throughout the entire movement range. This preliminary action ensures that the control link and link follower maintain continuous contact without play, resolving the guidance stability issue while enabling smooth operation.

Inventive Principle:

Principle #10Preliminary action

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 play-free and reduced rotational movement, enhancing the guidance of the leaf relative to the fixed frame, ensuring smooth operation during lifting-off and shifting movements.

Implementation Method 1

A spring element provided between the leaf-side transverse guide part and the fixed-frame-side transverse guide part and pre-tensioned perpendicular to the frame main plane when the leaf is lifted off

Methodology Applied

Scientific EffectSpring pre-tensioning: Spring

Data Source

PatentUS12480344B2Fitting assembly for arranging between a fixed frame and a leaf of a window or door

Publication Date: 2025.11.25 ROTO FRANK FENSTER & TURTECHNOLOGIE GMBH

AI summary

A fitting assembly for arranging between a fixed frame and a leaf of a window or a door includes a transverse guide, a lift-off drive and a longitudinal guide. A leaf-side transverse guide part of the transverse guide can be moved into a lifting-off position by the lift-off drive, in a lifting-off direction running perpendicular to a frame main plane of the fixed leaf, relative to a fixed-frame-side transverse guide part. The fixed-frame-side transverse guide part is movably guided, as part of the longitudinal guide, on a longitudinal guide path of the longitudinal guide, along the frame main plane in a shifting direction. A spring element is arranged between the leaf-side transverse guide part and the fixed-frame-side transverse guide part, which spring element is pre-tensioned perpendicular to the frame main plane when the leaf-side transverse guide part is in the lifting-off position.