Window Fitting Eccentric Pin Adjustment Mechanism

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Solution Overview

Problem

Existing window and door fittings struggle with adjusting the blocking or latching force in tilted positions, especially when installed in tight spaces, making it difficult to prevent slamming, and require modifications to the upper sash rebate or seal for accessible adjustment.

Innovation Solution

A fitting with a replaceable elongated leaf spring and a wing bracket system featuring bent legs, an eccentric pin, and a slider mechanism that allows for easy adjustment of the latching force from the front or below, without modifying the upper sash rebate or seal, using a wing bracket with protruding legs and an eccentric pin that engages with a leaf spring for adjustable locking security.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the fitting is installed in tight spaces between the wing side and the ceiling, then the fitting can be used in various window constructions, but the adjustment of the blocking force becomes difficult or impossible from above

Engineering Contradiction:

Improveadaptability to various window constructionsVSAvoidadjustability of blocking force

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The adjustment mechanism is inverted from the conventional design by providing access from below rather than from above. The adjustment tool can be inserted through the guide rail opening at the bottom, allowing adjustment of the blocking force even when the fitting is installed in tight spaces between the wing side and ceiling.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The adjustment access is moved from the vertical dimension (from above) to the horizontal dimension (from the front/below through the guide rail opening). This dimensional change allows adjustment without requiring space above the sash.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Device complexity

If the adjustment mechanism is mounted above the sash or behind the sash rebate, then the fitting structure is compact, but the adjustment becomes very difficult or not possible at all from above

Engineering Contradiction:

Improvecompactness of fitting structureVSAvoidaccessibility of adjustment

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

Instead of mounting the adjustment mechanism above the sash, the invention inverts the access path by providing adjustment capability from below through the guide rail opening. The blocking force adjustment is achieved by inserting an adjustment tool through the opening at the bottom of the guide rail.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The guide rail serves as an intermediary structure that provides access to the adjustment mechanism. The adjustment tool passes through the guide rail opening to reach the blocking force adjustment component, enabling adjustment without direct access from above.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If the upper sash rebate or seal is modified or processed to enable adjustment, then the adjustment becomes accessible, but the installation process becomes more complex and time-consuming

Engineering Contradiction:

Improveaccessibility of adjustmentVSAvoidinstallation complexity

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The fitting is segmented into separate components: the wing bracket, the sash bracket, and the guide rail. The guide rail with its opening is designed as a separate element that provides adjustment access without requiring modification of the sash rebate or seal, simplifying installation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guide rail structure itself provides the adjustment access path through its opening. The system is designed to be self-sufficient, requiring no external modifications to the sash or frame for adjustment capability.

Inventive Principle:

Principle #25Self-service

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

Enables easy and accessible adjustment of the latching force to suit various sash sizes and weights, preventing slamming while maintaining secure locking without requiring modifications to the upper sash rebate or seal, and allowing for user-friendly operation from the front or below.

Implementation Method 1

an elongated leaf spring (7) which is arranged on the casement bracket (3) in a tensioned state

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

an eccentric pin (6) which can be articulated in a holder (6a) and which can be adjusted in the mounted state to change the blocking or latching force

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Data Source

PatentEP2573304B1Fitting for easy adjustment of a blocking force

Publication Date: 2017.09.20 HAUTAU

Figure 1~2
Figure 3~6
Figure 7a~7c

AI summary

The fitting (C) has a small arm which is connected to one end of large arm (4). An eccentric pin (6) is arranged at another end (5a) of small arm through a slot extending in the leg (3a) of hinge bracket (3). The eccentric pin during opening movement of large arm and swiveling of small arm is guided in the slot along the leaf spring (7) arranged at hinge bracket. An eccentric region of the eccentric pin is moved with opening movement of ridge (7a) and is locked between the slot end and ridge, before the end of slot is engaged by ridge of the leaf spring through the slit laterally. Independent claims are included for the following: (1) method for operating fitting; and (2) plate spring.