Adjustable Panel Insert Assembly for Flush High-Strength Fastening
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Solution Overview
Problem
Existing fasteners for aircraft interior panels, such as flight deck doors, lack sufficient strength to withstand structural loadings and manufacturing variations, leading to stress concentrations and appearance issues due to inconsistent thickness.
Innovation Solution
A plug-and-sleeve insert system with a threaded insert, made from high-strength materials like stainless steel, featuring resilient beams and a retaining plate, which can accommodate varying panel thicknesses through sliding engagement and bonding, ensuring robust and flush installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional inserts are used to secure hardware to aircraft interior panels, then the installation process is simple, but the inserts lack sufficient strength to withstand structural loadings including sudden impacts
Solution Approach 1:
The insert is divided into two separate components: a plug component and a sleeve component. The plug component includes a head portion with an outer flange and a body portion with a cavity, while the sleeve component includes a cylindrical portion that fits into the cavity. This segmentation allows each component to be optimized for strength while maintaining ease of installation through a press-fit assembly process.
Solution Approach 2:
The insert components are made from high-strength materials such as stainless steel grade 15-5 PH (UNS S15500) or other high-strength alloys. This material selection provides robustness to withstand structural loadings including sudden impacts while maintaining the structural integrity of the aircraft interior panels.
2Adaptability or versatility
If standard inserts are used with panels of varying thickness, then inventory is reduced, but the inserts do not remain flush with panel surfaces causing appearance issues and stress concentrations
Solution Approach 1:
The insert design incorporates a dynamic adjustment mechanism where the sleeve component can be positioned at different depths within the plug's cavity. This allows the outer flange of the sleeve to remain flush with the panel surface regardless of panel thickness variations. The sleeve acts as an adjustable element that adapts to different thicknesses while maintaining precise flush installation.
Solution Approach 2:
The insert system accommodates panel thickness variations by changing the effective length parameter of the insert assembly. The sleeve component can be inserted to different depths into the plug's cavity, effectively adjusting the overall insert length to match different panel thicknesses while keeping the outer flange flush with the panel surface.
3Ease of operation
If floating threaded inserts are included to accommodate manufacturing variations, then ease of bolt installation is improved, but the insert complexity increases and strength is reduced
Solution Approach 1:
The floating threaded insert is nested within the cavity of the plug component, and the sleeve component is nested within the plug's outer flange. This nested arrangement allows the threaded insert to float freely within the cavity while being protected by the robust plug and sleeve structures, maintaining both strength and ease of bolt installation.
Solution Approach 2:
The plug and sleeve components act as intermediary structures that protect and support the floating threaded insert. The robust plug and sleeve maintain the structural strength required to withstand loadings, while the nested floating insert provides ease of bolt installation by accommodating manufacturing variations in panel thickness and hole positioning.
4Strength
If high-strength materials are used for the insert, then structural integrity is improved, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The insert is segmented into plug and sleeve components that can be manufactured separately using standard machining processes for high-strength materials. This segmentation allows for optimized manufacturing of each component while maintaining the structural integrity provided by materials like stainless steel grade 15-5 PH. The separate components can be pre-manufactured and then assembled through a simple press-fit process.
Solution Approach 2:
The plug and sleeve components are designed with universal features that accommodate various panel thicknesses and hardware types. The standardized high-strength material selection and modular design allow the same insert assembly to be used across different aircraft interior panel applications, reducing overall manufacturing complexity despite the use of high-strength materials.
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 insert system provides enhanced strength and adaptability to accommodate panels of varying thickness, improving structural integrity and appearance by ensuring proper flush installation and secure fastening, while reducing inventory and assembly time.
Implementation Method 1
a plurality of resilient beams, and a cavity extending through the central portion, the cavity adapted for receiving the distal end portion of the plug
Data Source
AI summary
A method of installing an insert in an aperture of a panel includes inserting a sleeve central portion into the aperture so that a sleeve flange opposes a first side of the panel. The sleeve central portion extends from the sleeve flange. The method further includes inserting a plug central portion into the aperture so that a plug flange opposes a second side of the panel. The plug central portion extends from the plug flange. The method also includes pressing at least one of the plug and sleeve into sliding engagement with the other until the plug and sleeve are installed. When installed, a distal end of the plug is received into a sleeve cavity and resilient beams defined by an extension of the sleeve central portion are elastically deflected by a wall of the plug central portion. The plug flange defines an aperture extending into a plug cavity.