Roller Door Stiffening Ribs Nested in Curtain Pockets

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Solution Overview

Problem

Roller doors reinforced with struts often become thickened, leading to issues with winding on a shaft as they can run out of round or require excessive space, compromising their functionality under high wind pressure and space-saving requirements.

Innovation Solution

A roller door design featuring a flexible curtain with integrated stiffening ribs arranged at defined intervals, allowing for space-saving winding without overlapping, and a keder tube winding shaft with a hemstitch incorporating stiffening profiles, ensuring stability and ease of rolling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If reinforcement struts are added to increase rigidity, then wind resistance is improved, but the door thickness increases and winding space requirements increase

Engineering Contradiction:

Improvewind resistanceVSAvoidwinding space

Core Design Contradiction:

StrengthVSVolume of moving object

Solution Approach 1:

The reinforcement struts are integrated into pockets formed in the curtain material, with the struts nested within these pockets. This nesting approach allows the reinforcement elements to be contained within the curtain structure itself, minimizing additional thickness while maintaining rigidity for wind resistance.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The curtain is constructed with a flexible material that forms pockets to hold the reinforcement struts. This flexible film structure provides the necessary containment for rigid elements while maintaining the overall flexibility and thin profile required for space-saving winding operations.

Inventive Principle:

Principle #30Flexible shells and thin films

2Strength

If reinforcement struts are added to increase rigidity, then wind resistance is improved, but the winding shaft may run out of round

Engineering Contradiction:

Improvewind resistanceVSAvoidwinding shaft integrity

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The reinforcement struts are nested within pockets formed in the curtain, preventing them from protruding outward. This containment ensures that the winding shaft maintains a consistent circular profile during rotation, preventing it from running out of round while still providing the necessary wind resistance through the integrated struts.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Volume of moving object

If stiffening profiles are made thin to enable winding, then space-saving winding is achieved, but structural stability may be compromised

Engineering Contradiction:

Improvewinding spaceVSAvoidstructural stability

Core Design Contradiction:

Volume of moving objectVSStrength

Solution Approach 1:

The curtain assembly combines flexible curtain material with rigid reinforcement struts to create a composite structure. This composite construction allows the overall system to maintain thin dimensions for space-saving winding while the integrated rigid struts provide the necessary structural stability and wind resistance.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP1857628B1Roller gate

Publication Date: 2010.07.07 AGROTEL

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AI summary

The door has hollow seams and/or reinforcement ribs (42) and the distances (a,b,c,d) between the two are varied from top to the bottom and depends on the diameter of the winding shaft (30) and has value between 12 to 15 times the diameter of the winding shaft. The distance lying between the bottom and the upper reinforcing ribs has a value between 4 to 15 times the diameter of the winding shaft.