Fireproof Door Running Gear Axial Force Transmission

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Solution Overview

Problem

Existing fire protection gates and doors face limitations in lateral guidance, carrying capacity, and friction, leading to imprecise positioning and potential leaks or jamming, which compromise fire protection and safety.

Innovation Solution

A running gear system with two support rollers, one designed to transmit axial forces for precise positioning and the other not, allowing for self-adjustment and preventing jamming, combined with a guide roller on the underside for improved guidance and reduced friction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If both support rollers are designed with profiles that transmit axial forces to the running rail, then precise lateral guidance is achieved, but the risk of jamming increases and fire protection may be compromised

Engineering Contradiction:

Improvelateral guidance precisionVSAvoidfire protection reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies local quality by giving different profiles to the two support rollers: the first support roller has a profile that transmits axial forces to the running rail for precise lateral guidance, while the second support roller has a profile that does not transmit axial forces to prevent jamming. This differentiated local design allows each roller to fulfill its specific function optimally.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If contact surfaces in the running rail are arranged close to the support rollers, then precise positioning is achieved, but the risk of jamming increases

Engineering Contradiction:

Improvedoor positioning precisionVSAvoiddoor movement smoothness

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent implements local quality by creating different interaction characteristics between the support rollers and running rail: the first support roller engages with the running rail at contact surfaces close to the roller for precise positioning, while the second support roller engages in a manner that avoids jamming. This localized differentiation resolves the contradiction between precision and smooth operation.

Inventive Principle:

Principle #3Local quality

3Device complexity

If a single support roller design is used for both sides of the door, then device complexity is reduced, but lateral guidance precision and carrying capacity are limited

Engineering Contradiction:

Improverunning gear complexityVSAvoidlateral guidance precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by designing the two support rollers with different profiles suited to their respective functions: one optimized for lateral guidance precision and the other for preventing jamming. This differentiated design improves overall performance despite increased complexity, while still maintaining relatively simple construction.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the support roller function into two distinct rollers with different profiles rather than using a single unified design. This segmentation allows each roller to be optimized for its specific role, improving both lateral guidance precision and carrying capacity.

Inventive Principle:

Principle #1Segmentation

4Adaptability or versatility

If the door experiences lateral deflection during movement, then adaptability to movement variations is achieved, but restoring force builds up gradually leading to imprecise guidance

Engineering Contradiction:

Improvemovement adaptabilityVSAvoiddoor path precision

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary anti-action through the first support roller, which is designed to counteract lateral deflections before they become significant. The roller's profile and contact surface arrangement create restoring forces that actively prevent lateral path deviations, ensuring precise door guidance during movement.

Inventive Principle:

Principle #9Preliminary anti-action

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

Ensures precise lateral guidance, high load capacity, and reliable closure while preventing jamming, thereby guaranteeing good tightness and fire protection.

Implementation Method 1

the profile of the support roller is essentially a negative of the profile of the running rail... forces can be transferred in the direction of the supporting roller axis of rotation from the supporting roller to the running rail

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

at least two support rollers, which are arranged such that they can rotate about the same support roller axis of rotation or about axes that are parallel to one another

Methodology Applied

Scientific EffectRolling: Roller

Data Source

PatentEP1748135B1Fireproof door with carriage and guide rails

Publication Date: 2012.10.03 TORTEC BRANDSCHUTZTOR

Figure 1a
Figure 1b
Figure 2a~2c

AI summary

The assembly set comprises a carriage for a door panel with support roller (21) running in a track (27,28). The support roller and track each have a profile for transferring forces designed so that when the roller is mounted on the track they contact one another at two contact areas (37) demarcated from one another along the periphery of the roller. The roller can have a U or V shaped inwardly arched profile. A second roller can have a profile which transfers no forces in the direction of the roller rotational axis.