Perforated Seat Mount Straps for Aircraft Partition Deflection

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Solution Overview

Problem

Cabin attendant seats in aircraft are prone to failure during dynamic events due to increased loads, causing damage to both the seat and the aircraft partition, which are typically flexible and bend under such conditions.

Innovation Solution

A mount assembly for cabin attendant seats that includes straps with perforations allowing plastic deformation, enabling the straps to translate relative to fasteners, thereby absorbing energy and maintaining the seat's coupling to the support structure during dynamic events.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If rigid mounting components are used to securely attach the seat to the partition, then the seat coupling strength is improved, but the components are prone to failure during dynamic events due to increased loads

Engineering Contradiction:

Improveseat coupling strengthVSAvoidcomponent reliability during dynamic events

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The strap material properties are changed to allow plastic deformation at controlled stress levels. The yield strength of the strap is deliberately set below the ultimate strength of rigid components, allowing the strap to deform and absorb energy while maintaining connection integrity during dynamic events.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The potential harm of strap deformation is converted into a benefit by designing the strap to plastically deform in a controlled manner during dynamic events. This deformation absorbs excess energy and prevents catastrophic failure, transforming what would be a weakness into a protective mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Adaptability or versatility

If flexible partition structures are used to accommodate aircraft cabin requirements, then the adaptability is improved, but the partition and mating components experience increased loads during dynamic events

Engineering Contradiction:

Improvepartition flexibilityVSAvoiddynamic load on mating components

Core Design Contradiction:

Adaptability or versatilityVSForce

Solution Approach 1:

The mount assembly with deformable straps acts as an intermediary between the flexible partition and the rigid seat structure. The straps absorb and distribute dynamic loads, protecting both the partition and seat from excessive forces while maintaining the necessary flexibility of the partition structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If rigid fasteners are used to attach the strap to the seat, then the attachment strength is improved, but the strap cannot accommodate plastic deformation during dynamic events

Engineering Contradiction:

Improveattachment strengthVSAvoidstrap deformation capability

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The fastener system is designed to allow relative movement between the strap and the seat structure during dynamic events. The perforations and fastener configuration enable the strap to deform and translate while maintaining attachment, transforming a static rigid connection into a dynamic adaptive system.

Inventive Principle:

Principle #15Dynamics

4Adaptability or versatility

If the perforation length is increased to allow strap translation and deformation, then the adaptability during dynamic events is improved, but the attachment precision is reduced

Engineering Contradiction:

Improvestrap translation capabilityVSAvoidfastener alignment precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The attachment system is segmented into discrete components: the strap with perforations, the fasteners, and the seat structure. This segmentation allows each component to be optimized independently - the perforations provide deformation capability while the fasteners maintain precise attachment points, resolving the conflict between adaptability and precision.

Inventive Principle:

Principle #1Segmentation

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

The mount assembly effectively attenuates the deflection of the support structure, preventing separation of the seat from the partition and protecting both components from damage during events like crashes or rejected take-offs.

Implementation Method 1

The strap may include a perforation at each end for receiving a fastener to mount the strap to the cabin attendant seat. The perforations may be configured to allow the strap to translate relative to the fasteners during a plastic deformation of the strap.

Methodology Applied

Scientific EffectPlastic deformation: Plasticity

Data Source

PatentEP4253143B1Flexible wall mount for aircraft cabin seat

Publication Date: 2026.02.25 AMI IND INC

Figure 1A~1B
Figure 2
Figure 3A~3B

AI summary

A mount assembly (128) for mounting a cabin attendant seat (100) to a support structure (140) may comprise a first strap (150a) configured to plastically deform in response to a deflection of the support structure (140). The first strap (150a) may comprise a first perforation (160), a second perforation (162), and a third perforation (164) located between the first perforation (160) and the second perforation (162). The perforations (160, 162, 164) may be configured to allow the strap (150a) to plastically deform.