Driver Finger Radial Movement for Double-Leaf Revolving Door Sequence Control

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Solution Overview

Problem

Current closing sequence controls for double-leaf swing doors, particularly in fire protection doors, face challenges such as requiring the active leaf to be opened beyond a certain angle for proper operation, leading to space and visual issues due to protruding components like carrier flaps and driver fingers.

Innovation Solution

A linearly moved driver finger is attached to the active leaf, which engages with a counter-fitting on the fixed leaf during the closing movement, allowing for a flatter, immovable design that avoids space problems and is less visually intrusive, using a hook and spring mechanism for radial movement relative to the axis of rotation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a carrier flap is used for opening sequence control, then the active leaf can be opened sufficiently wide for proper closing sequence operation, but the carrier flap protrudes far beyond the fixed leaf when open and requires additional space near the vertical edge

Engineering Contradiction:

Improveopening angle of active leafVSAvoidspace occupied by carrier flap

Core Design Contradiction:

Ease of operationVSVolume of moving object

Solution Approach 1:

The driver finger is made movable relative to the active leaf, allowing it to extend radially outward during opening to engage the counter-fitting, then retract during closing to avoid obstruction. This dynamic positioning enables the mechanism to provide sufficient opening angle control while minimizing space occupation when not in use.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The driver finger is integrated into the active leaf structure rather than being a separate protruding component. It can be nested within or alongside other door components, reducing the overall space required and eliminating the need for additional external mounting space near the vertical edge.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of operation

If a driver finger with roller is used for opening sequence control, then linear movement is achieved, but the roller increases the overall height and makes the driver finger visually disturbing and space-consuming

Engineering Contradiction:

Improvelinear movement of driver fingerVSAvoidheight of driver finger

Core Design Contradiction:

Ease of operationVSLength of stationary object

Solution Approach 1:

The roller mechanism is replaced with a linear guide system that allows the driver finger to move radially without requiring a roller. This substitution eliminates the need for excessive height while maintaining smooth linear movement during engagement with the counter-fitting.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If the driver finger is arranged on the fixed leaf, then opening sequence control is achieved, but it obstructs the closing movement and requires significant space

Engineering Contradiction:

Improveopening sequence controlVSAvoidspace on fixed leaf

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

Instead of arranging the driver finger on the fixed leaf as in prior art, the invention inverts the arrangement by placing the driver finger on the active leaf and the counter-fitting on the fixed leaf. This inversion allows the mechanism to function effectively while using space on the moving component rather than the stationary component.

Inventive Principle:

Principle #13The other way round (Inversion)

4Reliability

If protruding components are used for opening sequence control, then proper engagement is achieved, but visual appearance is disturbed and space is wasted

Engineering Contradiction:

Improveengagement of opening sequence controlVSAvoidvisual appearance

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The driver finger is designed to protrude only locally and temporarily when needed for engagement with the counter-fitting during opening sequence control. During closing operations, it retracts to be flush with the active leaf surface, maintaining clean visual appearance while preserving reliable engagement functionality when required.

Inventive Principle:

Principle #3Local quality

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 proper locking sequence without obstructing the closing movement, maintaining door functionality while being discreetly integrated into the door frame, accommodating various door geometries and preventing excessive tilting moments.

Implementation Method 1

An elastic spring acts at least indirectly between the driver finger and the active leaf in such a way that it tends to move the driver finger radially to the axis of rotation of the active leaf

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP2085554B1Method for regulating the opening sequence of double-leafed revolving doors

Publication Date: 2016.03.16 DEGELSEGGER WALTER

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AI summary

The device has a catching finger (3) fixed to a movable wing (2) and is formed at fixed wing-sided end as hook (3.1) lying as in the plane of the swiveling motion of the movable wing. An open side of the hook is aligned to the closing direction of the movable wing and encompasses a counter-fitting (4) from the side with closed door wings. The side of the hook lies in the rear with the pivoting of the door wing. The counter-fitting is fixed to a fixed wing (1).