# US 8,146,863 B2 · Aircraft doorway

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- Number: US 8,146,863 B2
- Document ID: US8146863B2
- Status: Granted
- Kind: B2
- Application number: 12/376,085
- Filed: 2007-07-26
- Published: 2009-12-17
- Granted: 2012-04-03
- Earliest claimed: 2006-08-01
- Assignees: Airbus France
- Inventors: David Larcher
- Web page: https://patentgrep.com/patent/US8146863B2

## CPC

- B64C 1/1461: {Structures of doors or surrounding frames}
- B64C 1/062: {specially adapted to absorb crash loads}
- B64C: AEROPLANES; HELICOPTERS

## Abstract

The invention concerns a doorway in an aircraft fuselage comprising a door frame in which a door is mounted, this frame comprising an outer framework, an inner framework and a core placed between the inner framework and the outer framework, capable of absorbing energy from an impact, the core being a stiffener made of composite material having an accordion shape.

## Claims

### Claim 1

A doorway for an aircraft fuselage comprising a door frame inside which a door is mounted, the door frame comprising:
an outer framework,
an inner framework,
a core positioned between the inner framework and the outer framework and adapted to absorb energy from an impact,
wherein the core comprises a stiffener made of composite material having an accordion shape including a succession of V-shaped and inverted V-shapes bellows.

### Claim 2 (depends on 1)

The doorway as claimed in claim 1, wherein each bellows of the accordion-shaped stiffener has a rounded top.

### Claim 3 (depends on 1)

The doorway as claimed in claim 1, wherein the accordion-shaped stiffener is made of a single piece.

### Claim 4 (depends on 3)

The doorway as claimed in claim 3, wherein the accordion-shaped stiffener comprises four accordion-shaped sides connected by crenel-shaped corners.

### Claim 5 (depends on 1)

The doorway as claimed in claim 1, wherein the accordion-shaped stiffener comprises at least two independent stiffener components positioned end to end between the inner and outer frameworks.

### Claim 6 (depends on 5)

The doorway as claimed in claim 5, wherein the accordion-shaped stiffener comprises two vertical stiffener components and two horizontal stiffener components.

### Claim 7 (depends on 1)

The doorway as claimed in claim 1, wherein the stiffener is operably coupled to at least one of the outer framework and/or the inner framework by tops of the bellows.

### Claim 8 (depends on 1)

The doorway as claimed in any claim 1, wherein the composite material contains carbon fibers.

### Claim 9 (depends on 1)

An aircraft fuselage, comprising at least one doorway as claimed in claim 1.

### Claim 10 (depends on 1)

An aircraft, comprising at least one doorway as claimed in claim 1.