Aircraft Cabin Reading Lamp Tool-Free Adjustment Mechanism

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Solution Overview

Problem

Existing reading lamps installed in aircraft cabin trim elements require a large adjustment force and a special tool to move the lamp housing relative to the installation frame, making them cumbersome and costly to produce.

Innovation Solution

A reading lamp design featuring a ring element with a flange and securing elements, a ball-shaped lamp housing, and a clamping ring connected by tension spring elements, allowing for adjustment and secure mounting without a special tool, with adjustable tension spring elements providing a constant adjustment force and friction-locking retention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a traditional ball and socket joint design is used to allow lamp housing adjustment, then the lamp housing can be moved relative to the installation frame, but a relatively large adjustment force is required and a special tool is needed

Engineering Contradiction:
Improveease of adjustmentVSAvoidadjustment force
Core Design Contradiction:
Ease of operationVSForce

Solution Approach 1:

The patent changes the mechanical parameters of the adjustment mechanism by introducing a cam element with an inclined surface. Instead of relying on direct manual manipulation of a ball and socket joint, the cam element converts a small linear movement into a rotational movement that adjusts the lamp housing position. This parameter transformation allows adjustment with minimal force and without special tools.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent replaces the traditional ball and socket joint mechanism with a cam-based adjustment mechanism. The cam element with its inclined surface substitutes for the direct mechanical manipulation previously required, enabling adjustment through a simpler, tool-free operation while maintaining the ball and socket joint's positioning capability.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If a traditional ball and socket joint design is used to allow lamp housing adjustment, then the lamp housing can be moved relative to the installation frame, but a special tool is required for adjustment

Engineering Contradiction:
Improveease of adjustmentVSAvoidcomplexity of adjustment mechanism
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The patent replaces the complex traditional ball and socket adjustment mechanism with a simpler cam-based system. The cam element with an inclined surface provides the adjustment function through a more straightforward mechanical action, eliminating the need for special tools and reducing overall mechanism complexity while maintaining adjustment functionality.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts the adjustment function from the complex ball and socket joint mechanism and implements it separately through a dedicated cam element. This separation allows the adjustment mechanism to be simpler and more specialized, reducing the complexity of the overall system while maintaining the positioning capabilities of the ball and socket joint.

Inventive Principle:
Principle #2Taking out (Extraction)

3Reliability

If securing elements are provided on the ring element to secure the installation frame on the cabin trim element, then the installation frame can be securely mounted, but the structure becomes more complex

Engineering Contradiction:
Improvemounting securityVSAvoidstructural complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the securing function with the existing ring element structure by providing securing elements directly on the ring element. This integration allows the installation frame to be securely mounted on the cabin trim element without adding separate, complex securing mechanisms, thereby maintaining structural simplicity while ensuring reliable mounting.

Inventive Principle:
Principle #5Merging (Combining)

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 simple, cost-effective production and installation of the reading lamp, allowing for easy adjustment and secure mounting on various cabin trim element thicknesses without the need for a special tool, while compensating for component tolerances and providing a predefined adjustment force.

Implementation Method 1

the clamping ring is connected to the installation frame by means of tension spring elements, such that the lamp housing is forced against the support surface by means of the clamping ring

Methodology Applied
Scientific EffectSpring force: Spring

Implementation Method 2

the lamp housing is held in a friction-locking manner in a predefined position relative to the installation frame by means of the tension spring elements

Methodology Applied
Scientific EffectFriction: Friction

Data Source

PatentUS9796474B2Reading lamp for installation in a cabin trim element of a vehicle
Publication Date: 2017.10.24 DIEHL AEROSPACE GMBH
  • US9796474B2 patent drawing
  • US9796474B2 patent drawing
  • US9796474B2 patent drawing

AI summary

The invention relates to a reading lamp for installation in a cabin trim element (4) of a vehicle, in particular of an aircraft, comprisingan installation frame (1) having a ring element (2),a lamp housing (7) having a mating support surface (8), anda clamping ring (9)wherein the clamping ring (9) is connected to the installation frame (1) by means of tension spring elements (10), such that the lamp housing (7) is forced against the support surface (6) of the inner surface of the ring element (2) by means of the clamping ring (9) and may be moved with respect to the installation frame (1) in the manner of a ball and socket joint.