Deflection Device for Venetian Blind Reversing Gear

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Solution Overview

Problem

Existing external venetian blinds face challenges in adapting to non-standard curtain configurations, as reversing gears are typically available in specific versions, limiting their versatility in accommodating different curtain slat widths, shapes, and material orientations relative to lift tapes.

Innovation Solution

Equipping reversing gears with a deflection device that includes deflection means for elevator and turning belts, allowing these components to be deflected in various directions relative to the winding shaft, enabling their use with diverse curtain configurations without the need for additional perforations or guide bolts, and providing a clip attachment for easy integration with the head rail.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If reversing gears are available only in specific versions, then manufacturing standardization is improved, but adaptability to non-standard curtain configurations deteriorates

Engineering Contradiction:

ImprovestandardizationVSAvoidadaptability to non-standard configurations

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The reversing gear is equipped with deflection devices that can be adjusted to different positions and angles, allowing the mechanism to adapt dynamically to various curtain configurations including non-standard slat widths, shapes, and material orientations, while maintaining standardized manufacturing of the base reversing gear components

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The deflection devices allow changing the directional parameters of the lifting tape and turning belt paths, enabling the same standardized reversing gear to work with different curtain configurations by adjusting the deflection angles and positions rather than manufacturing different gear versions

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If deflection devices are added to reversing gears, then adaptability to diverse curtain configurations is improved, but device complexity increases

Engineering Contradiction:

Improveadaptability to diverse configurationsVSAvoidcomplexity of reversing gear

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The reversing gear system is segmented into the standardized base reversing gear and separate, modular deflection devices that can be independently adjusted and positioned, allowing adaptability without significantly increasing the complexity of the core reversing gear mechanism

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The deflection devices act as intermediary elements between the standardized reversing gear and the diverse curtain configurations, absorbing the complexity of adaptation while allowing the core reversing gear to remain simple and standardized

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If the blind is positioned closer to the building opening, then shading efficiency is improved, but lateral forces on the slat stack increase

Engineering Contradiction:

Improveshading efficiencyVSAvoidlateral forces on slat stack

Core Design Contradiction:

Object-affected harmful factorsVSForce

Solution Approach 1:

The deflection devices are configured with asymmetric positioning and orientation to counterbalance the lateral forces generated when the blind is positioned close to the building opening, allowing the blind to achieve optimal shading position while the deflection devices compensate for the resulting force imbalances on the slat stack

Inventive Principle:

Principle #4Asymmetry

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

This solution allows for the use of reversing gears with external venetian blinds having eccentrically perforated or non-standard slats, enhancing shading efficiency, wind stability, and visual appeal by enabling the blind to be closer to the building opening while minimizing lateral forces on the slat stack.

Implementation Method 1

a deflection device (32) is equipped on the reversing gears (30), which has deflection means (33, 34) for the elevator tape (3) and/or deflection means (34) for the at least one turning belt (2)

Methodology Applied

Scientific EffectMechanical guidance and deflection:

Data Source

PatentEP3048236B1Lamellar blind and deflection device for a reverse gear unit of the lamellar blind

Publication Date: 2017.08.09 D&M KG

Figure 1~2
Figure 3
Figure 4~3a

AI summary

The invention relates to a deflection device (32) for a reversing mechanism (30) of a venetian blind designed for shading a building opening, the blind having a lower end slat (4) and slats (1). The deflection device (32) guides the lifting tape (3) to a position that is shifted transversely to the winding shaft relative to a position located approximately vertically below the winding shaft (36), and/or at least one of the two reversing tapes (2) to a position that is shifted transversely to the winding shaft relative to a position located approximately vertically below the position where the reversing tape (2) is attached to the reversing element (36). The deflection device (32) has deflection means (33) for the lifting tape (3) and/or deflection means (34) for the at least one reversing tape.The invention is characterized in that the deflection device (32) is designed as a clip-on attachment (32) that can be fastened to the head rail (31) and/or as a cover that can be clipped onto the reversing mechanism, which carries these deflection means (33; 34). The invention also relates to a venetian blind in which each reversing mechanism (30) is provided with such a deflection device (32).