Translating Door Mechanism for Larger Aircraft Escape Slides

Solution Overview

Problem

Existing aircraft emergency egress doors with larger escape slides require longer hinge arms, which increase weight and reduce the width of the observation window, necessitating a door mechanism that accommodates larger slides without extending the hinge arm.

Innovation Solution

A door mechanism with an arm and arm-door interface that pivots the door lower portion more than the upper portion during translation, maintaining the door parallel to the opening, allowing for a larger escape slide without increasing hinge arm length.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a longer hinge arm is used to accommodate larger escape slides, then the door can be positioned further from the fuselage, but the weight of the door mechanism increases

Engineering Contradiction:

Improvespace for escape slideVSAvoidweight of hinge arm

Core Design Contradiction:

Volume of moving objectVSWeight of moving object

Solution Approach 1:

The door mechanism is segmented into multiple rigid links (first link, second link, third link) connected by joints, replacing a single long hinge arm. This segmentation allows the door to achieve the necessary movement range and positioning for larger escape slides while using shorter, lighter individual links.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The door mechanism transitions from simple rotation about a single hinge axis to a complex motion involving multiple links moving in three-dimensional space. The first link rotates about a first axis, the second link rotates about a second axis, and the third link rotates about a third axis, enabling the door to clear the fuselage without requiring a longer single hinge arm.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If a longer hinge arm is used to accommodate larger escape slides, then the door can be positioned further from the fuselage, but the width of the observation window is reduced

Engineering Contradiction:

Improvespace for escape slideVSAvoidwidth of observation window

Core Design Contradiction:

Volume of moving objectVSArea of stationary object

Solution Approach 1:

The door mechanism is segmented into multiple rigid links (first link, second link, third link) connected by joints, replacing a single long hinge arm. This segmentation allows the door to achieve the necessary movement range and positioning for larger escape slides while using shorter, lighter individual links.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The door mechanism transitions from simple rotation about a single hinge axis to a complex motion involving multiple links moving in three-dimensional space. The first link rotates about a first axis, the second link rotates about a second axis, and the third link rotates about a third axis, enabling the door to clear the fuselage without requiring a longer single hinge arm.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of operation

If the door is translated from closed to open position, then the door can be moved clear of the opening, but the door may no longer remain parallel to the opening

Engineering Contradiction:

Improvedoor translation capabilityVSAvoiddoor parallelism to opening

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The door mechanism is segmented into multiple rigid links (first link, second link, third link) connected by joints, replacing a single long hinge arm. This segmentation allows the door to achieve the necessary movement range and positioning for larger escape slides while using shorter, lighter individual links.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The door mechanism transitions from simple rotation about a single hinge axis to a complex motion involving multiple links moving in three-dimensional space. The first link rotates about a first axis, the second link rotates about a second axis, and the third link rotates about a third axis, enabling the door to clear the fuselage without requiring a longer single hinge arm.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

Enables larger escape slides by maintaining the door parallel to the opening, providing additional space for the slide without increasing weight or reducing the observation window width.

Implementation Method 1

rotating an arm about an arm-body hinge axis at an arm-body interface coupling the arm to a side of a door opening in a body

Methodology Applied

Scientific EffectRotation:

Implementation Method 2

pivoting, during rotation of the door, the arm-door lower joint about the arm-door upper joint in a manner causing a door lower portion to move in an outboard direction

Methodology Applied

Scientific EffectPivoting: Hinge

Data Source

PatentUS20250326478A1Door mechanism and method of opening a translating door

Publication Date: 2025.10.23 THE BOEING CO

AI summary

A door mechanism has an arm configured to be coupled to a side of a door opening in a body at an arm-body interface having an arm-body hinge axis about which the arm rotates. In addition, the door mechanism has an arm-door interface located on an end of the arm opposite the arm-body interface and which is configured to couple the arm to a door having a door lower portion and a door upper portion. The arm-door interface comprises an arm-door upper joint and an arm-door lower joint located below and inboard of the arm-door upper joint when the door is in a closed position. The arm-door lower joint is configured to pivot about the arm-door upper joint in a manner pivoting the door lower portion in an outboard direction to a greater extent than the door upper portion during translation of the door from the closed position to an open position.