Parallel-Moving Door Mechanism for Larger Aircraft Escape Slides

Solution Overview

Problem

Existing door mechanisms for large commercial aircraft with larger escape slides require longer hinge arms that are too long for standard door widths, leading to increased cost and weight, and negatively impact galley and lavatory locations.

Innovation Solution

A door mechanism with an arm-door interface featuring a spherical joint and an arm-door lower joint that pivots in an outboard direction, allowing the door to remain parallel to the opening while moving from a closed to an open position, accommodating larger escape slides without increasing hinge arm length.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If longer hinge arms are used to accommodate larger escape slides, then the door can be moved clear of the door opening and provide additional space for the slide bustle, but the hinge arms become too long to fit on standard width doors, increasing cost and weight

Engineering Contradiction:

Improvespace for slide bustleVSAvoidhinge arm length

Core Design Contradiction:

Volume of moving objectVSLength of moving object

Solution Approach 1:

The door mechanism is segmented into multiple components: a hinge arm with first and second ends, a door interface at the first end, and a body interface at the second end. The arm-door interface includes upper and lower joints that work together to achieve the desired motion. This segmentation allows each component to be optimized independently, enabling the mechanism to provide sufficient clearance for large escape slides while maintaining a compact hinge arm length suitable for standard door widths.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention introduces a vertical dimension to the door motion by incorporating a spherical joint at the arm-door upper joint and an arm-door lower joint positioned below it. When the door opens, the lower joint pivots about the spherical joint, causing the door lower portion to move in an outboard direction away from the body. This vertical/outboard motion component provides the necessary clearance for large escape slides without requiring proportionally longer hinge arms, thus resolving the contradiction between clearance space and hinge arm length.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If door width is increased to accommodate larger escape slides, then there is sufficient space for the slide bustle, but cost and weight increase and galley and lavatory locations are negatively impacted

Engineering Contradiction:

Improvespace for escape slideVSAvoiddoor weight

Core Design Contradiction:

Volume of moving objectVSWeight of moving object

Solution Approach 1:

The invention employs a dynamic door mechanism that changes the door's position and orientation during opening. The arm-door lower joint is positioned below and inboard of the arm-door upper joint, and pivots about the spherical joint to cause the door lower portion to move in an outboard direction. This dynamic motion provides variable clearance throughout the opening sequence, ensuring sufficient space for large escape slides while maintaining standard door dimensions and minimizing weight.

Inventive Principle:

Principle #15Dynamics

3Volume of moving object

If door width is increased to accommodate larger escape slides, then there is sufficient space for the slide bustle, but galley and lavatory locations are negatively impacted

Engineering Contradiction:

Improvespace for escape slideVSAvoidimpact on galley and lavatory locations

Core Design Contradiction:

Volume of moving objectVSAdaptability or versatility

Solution Approach 1:

The door mechanism is segmented into multiple components: a hinge arm with first and second ends, a door interface at the first end, and a body interface at the second end. The arm-door interface includes upper and lower joints that work together to achieve the desired motion. This segmentation allows each component to be optimized independently, enabling the mechanism to provide sufficient clearance for large escape slides while maintaining a compact hinge arm length suitable for standard door widths.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention introduces a vertical dimension to the door motion by incorporating a spherical joint at the arm-door upper joint and an arm-door lower joint positioned below it. When the door opens, the lower joint pivots about the spherical joint, causing the door lower portion to move in an outboard direction away from the body. This vertical/outboard motion component provides the necessary clearance for large escape slides without requiring proportionally longer hinge arms, thus resolving the contradiction between clearance space and hinge arm length.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20250326479A1Door mechanism and method of opening a door

Publication Date: 2025.10.23 THE BOEING CO

AI summary

A door mechanism has an arm, an arm-door interface, and an arm-body interface. The arm-body interface couples the arm to a door opening in a body in a manner allowing rotation of the arm about an arm-body hinge axis. The arm-door interface couples the arm to a door configured to remain parallel to the door opening when moved between closed and open positions. 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. The arm-door upper joint is a spherical joint. The arm-door lower joint is located inboard of the arm-door upper joint when the door is in the closed position. The arm-door lower joint pivots about the spherical joint in a manner causing a door lower portion to move in an outboard direction away from the body when the door is moved to the open position.