Roll Door Mounting Inversion for Safety and Fatigue Reduction

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Solution Overview

Problem

Roll doors used in machine guard enclosures pose risks of injury due to the gap between the door panel and roll bar being accessible, especially at low heights, and the protruding roll bar obstructing access and increasing the risk of head injuries and torque-related fatigue in connections.

Innovation Solution

The roll door design positions the top roll cover and roll bar behind the side frames, with mounting flanges attached vertically to supporting beams, eliminating the gap's accessibility and reducing torque forces on connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the roll bar and top roll cover are mounted on the front of the door, then the door structure is simple and easy to manufacture, but the gap between the door panel and roll bar becomes accessible creating injury risk

Engineering Contradiction:

Improvemounting simplicityVSAvoidinjury risk from accessible gap

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional mounting arrangement by positioning the top roll cover and roll bar behind the side frames instead of on the front. This inversion eliminates the accessible gap between the door panel and roll bar, preventing injury while maintaining structural simplicity through proper alignment with supporting beams.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the spatial dimension of the roll bar positioning from front-protruding to rear-set, moving it to another dimension relative to the side frames. This dimensional change eliminates the hazard while preserving the functional relationship between the roll bar and door panel.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If the roll bar and top roll cover project outside the enclosure, then mounting is simplified, but head injuries and access obstruction risks increase

Engineering Contradiction:

Improvemounting simplicityVSAvoidhead injury risk and access obstruction

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

Instead of mounting the roll cover on the front of the side frames causing protrusion, the patent inverts the arrangement by mounting it on the rear, causing the roll bar to be set back behind the side frames. This eliminates head injury risks and access obstruction while maintaining mounting simplicity.

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If mounting flanges are fitted to side frames without attachment to supporting beams, then installation is easier, but torque causes connection fatigue

Engineering Contradiction:

Improveinstallation easeVSAvoidconnection fatigue resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent segments the mounting system into two distinct attachment points: mounting flanges attached to side frames for easy installation, and additionally attached to supporting beams for structural support. This segmentation allows both easy installation and fatigue resistance to be achieved simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent merges the mounting function with the supporting beam structure by having the mounting flanges attach to both the side frames and the supporting beams. This combination provides both the ease of installation from side frame attachment and the fatigue resistance from beam attachment.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP3306026B1Roll door

Publication Date: 2019.06.19 NORDIC DOOR

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AI summary

A roll door (1) includes a flexible door panel (5), a roll bar, side frames (2), mounting flanges (10a) for mounting the roll bar on the side frames (2), a motor (6), and a top roll cover (3). The mounting flanges (10a) are arranged vertically above supporting beams (12a) supporting the side frames (2), respectively.