Window Sash Support Device with Axial Bolt and Pivoting Lever

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Solution Overview

Problem

Existing support devices for window sashes struggle with reliably pressing the sash against the frame without requiring tight tolerances and often have complex designs or are unsuitable for low seam heights.

Innovation Solution

A support device with a bolt element guided in an axially displaceable manner, pretensioned by one fitting part, and a pivoting lever with flanges for attachment, which includes a spring element for prestressing the sash against the frame, ensuring stability and ease of assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a support device uses a bolt element mounted on a resilient arm to prestress the sash against the frame, then the sash is pressed against the frame making it difficult to lever open, but the device requires tight tolerances and complex structural design

Engineering Contradiction:

Improvesash pressing reliabilityVSAvoidsupport device structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The support device is divided into two separate fitting parts: one with the bolt element and guide, another with the pivoted lever and bearing. This segmentation allows independent optimization of each component, simplifying manufacturing tolerances while maintaining reliable sash pressing through the coordinated action of the pretensioned bolt element and the pivoted lever mechanism.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of mounting the bolt element directly on a resilient arm as in prior art, the invention inverts the approach by guiding the bolt element axially in a fixed fitting part while using a separate pivoted lever with bearing to provide the prestressing action. This inversion simplifies the structural design by eliminating the need for tight tolerances in resilient arm mounting.

Inventive Principle:

Principle #13The other way round (Inversion)

2Force

If a support device uses a first support part with an edge supporting a second pivotable support part, then the device can support external pressure on the sash, but it requires a very large amount of space and is difficult to use with low seam heights

Engineering Contradiction:

Improveexternal pressure supportVSAvoidsupport device space

Core Design Contradiction:

ForceVSVolume of moving object

Solution Approach 1:

The pivoted lever is arranged parallel to the pivot bearing axis rather than perpendicular to it, utilizing the axial dimension of the pivot bearing. This dimensional reorientation allows the support device to provide external pressure support within the limited space of low seam heights, as the pivoted lever operates in the axial direction of the pivot bearing rather than requiring radial space.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Strength

If the pivoting lever is inclined in the closing direction of the sash, then forces of the bolt element are introduced into the pivoted lever and supported by the bearing making it difficult to pry open, but this may complicate the construction of the fitting part

Engineering Contradiction:

Improveresistance to pryingVSAvoidfitting part construction

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The fitting part with the pivoted lever is segmented into distinct functional elements: the pivoted lever itself, the bearing for supporting it, the stop for limiting movement, and the spring element for prestressing. This segmentation allows the inclined pivoted lever to effectively introduce bolt element forces into the bearing for prying resistance, while each component can be manufactured and assembled independently, simplifying overall construction.

Inventive Principle:

Principle #1Segmentation

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 effectively prevents the sash from being easily pried open, provides high prestressing forces, and is suitable for windows with small rebate clearances, while maintaining a simple and stable structure.

Implementation Method 1

one of the fitting parts has a spring element for prestressing the bolt element relative to a bearing of the pivoting lever

Methodology Applied

Scientific EffectSpring element prestressing: Spring

Implementation Method 2

the pivoting lever is supported on the bolt element when the sash is closed

Methodology Applied

Scientific EffectMechanical force transmission: Mechanical Force

Implementation Method 3

the bolt element is guided in an axially displaceable manner

Methodology Applied

Scientific EffectAxial guidance:

Implementation Method 4

the pivoting lever and the bolt element have concave and convex supporting surfaces which correspond to one another. In this way, possible snagging of the bolt element and the pivoting lever are also reliably avoided. The support surfaces are preferably part-circular and engage in one another in the manner of a bearing.

Methodology Applied

Scientific Effect Bearing engagement: Ball Bearing

Data Source

PatentEP2395187B1Additional lock for a leaf pivotable relative to the frame

Publication Date: 2016.02.10 WINKHAUS

Figure 1
Figure 2~3
Figure 4~5

AI summary

The supporting device (6) comprises a fitting (8) which has a bolt element (10), where the other fitting (7) is supported parallel to a rotary support (3). The fitting has a spring element for pre-stressing the bolt element relative to a bearing of a pivoting lever (9). The fitting has a pivoting lever which is supported at the bolt element during closure of a wing (2).