Overhead Bin Door Latch With Deflection-Tolerant Lock Indication

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Solution Overview

Problem

Existing locking devices for overhead luggage compartments in aircraft are unreliable in detecting incomplete closure due to deflection caused by tolerances or load, leading to potential accidents from falling luggage.

Innovation Solution

A locking device with a freely movable actuating handle and a hook design featuring an elongated hole or elastic spacer, allowing secure engagement and visible indicators even with slight handle deviations, ensuring reliable closure and easy detection of incomplete locking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the locking device uses a fixed indicator position on the handle, then the indicator is visible when the handle protrudes, but the indicator becomes unreliable when the compartment deflects under load

Engineering Contradiction:

Improvelocking indication reliabilityVSAvoidadaptability to compartment deflection

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The indicator is designed to move dynamically with the handle's angular position rather than being fixed. The indicator comprises a movable element that changes its position or visibility state based on the handle's rotation angle, allowing it to remain reliable even when the handle deflects under compartment load. This dynamic adaptation ensures the indicator continues to accurately represent the locking state regardless of structural deflection.

Inventive Principle:

Principle #15Dynamics

2Difficulty of detecting and measuring

If the indicator is placed on the side of the operating handle, then it is visible when the handle protrudes slightly, but it fails to indicate properly when deflection prevents handle protrusion

Engineering Contradiction:

Improveincomplete locking detectionVSAvoiddetection reliability under deflection

Core Design Contradiction:

Difficulty of detecting and measuringVSReliability

Solution Approach 1:

The indicator provides visual feedback about the locking state by changing its appearance or position in response to the handle's angular position. When the handle is not fully rotated to the locked position, the indicator becomes visible or changes color/shape to signal the incomplete locking state. This feedback mechanism remains effective even when compartment deflection prevents the handle from protruding, as it responds to the angular position rather than physical protrusion.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If the locking device allows handle deflection under load, then it accommodates compartment flexibility, but the indicator becomes less visible or unreliable

Engineering Contradiction:

Improveaccommodation of compartment deflectionVSAvoidindicator visibility

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

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 solution provides a secure and easily manufacturable locking mechanism that reliably indicates incomplete closure, preventing accidental opening of luggage compartments even under deflection, without electronic components.

Implementation Method 1

The hook can be resiliently mounted via a torsion spring, wherein the torsion spring is arranged such that it acts in the closing direction of the hook.

Methodology Applied

Scientific EffectTorsion spring: Torsion Spring

Implementation Method 2

the at least one hook can be resiliently mounted via a torsion spring

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP4568889B1Locking device for locking a pivotably mounted door of a container, in particular a luggage compartment door of an overhead luggage compartment, and overhead luggage compartment with a locking device of this type

Publication Date: 2026.02.11 FACC

Figure 1~2
Figure 3~4
Figure 5A~6B

AI summary

A locking device (1) for locking a pivotably mounted door (21) of a container (20) in the closed position, with a housing (2), at least one hook (3) for hooking into a holder shaft (26), and an actuating handle (4) for unlocking the hook (3), wherein the at least one hook (3) can be actuated by the actuating handle (4) via at least one driver (6) in such a way that, upon movement of the actuating handle (4), the at least one hook (3) is movable out of the closed position, wherein the actuating handle (4) is freely movable about a predefined angular range (Δα), before the at least one hook (3) can be unlocked, and with at least one display (5) for identifying an incompletely locked state of the door (21), and an overhead luggage compartment (22) with a locking device (1) of this type. The at least one display (5) is arranged on at least one lateral outer surface (15) of the actuating handle (4) and substantially perpendicularly with respect to the second rotational axis (D2) for the actuating handle (4).