Composite Threaded Standoff with Nub-Controlled Bond-Line Thickness
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Solution Overview
Problem
Conventional standoff units have complex assembly processes due to multiple components, increased weight due to excess adhesive, and lack features for achieving optimal bond-line thickness and reduced curing time, which is critical in aerospace and space-bound vehicles.
Innovation Solution
A composite standoff unit with a bottom platform, standoff column, and integrated threaded portion, featuring predefined nubs on the bonding surface and slotted channels for symmetrical design, allowing for a single-piece construction and controlled adhesive thickness without additional components or applicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple separate components are used for the standoff unit (base portion, threaded nut, plug), then the standoff unit can be assembled, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The patent combines the base portion, threaded nut, and plug into a single integrated standoff unit that is molded as one piece. The threaded portion is formed directly within the body of the standoff column, eliminating the need for separate threaded nuts and plugs. This merging of components directly resolves the technical contradiction by reducing device complexity while maintaining ease of manufacture through single-piece molding.
2Reliability
If excess adhesive is applied to ensure proper bonding, then the bonding reliability is improved, but the weight of the standoff unit increases
Solution Approach 1:
The patent incorporates protrusions on the bonding surface that perform the preliminary action of defining and controlling the adhesive layer thickness before the adhesive is even applied. These protrusions pre-establish the gap between the mounting surface and the standoff unit, ensuring that the adhesive layer maintains a consistent, optimal thickness. This preliminary structural feature eliminates the need to apply excess adhesive, thereby reducing weight while maintaining bonding reliability.
3Productivity
If adhesive is applied without controlled thickness, then the application process is simple, but the curing time cannot be optimized and bond-line thickness is inconsistent
Solution Approach 1:
The protrusions on the bonding surface perform the preliminary action of pre-defining the bond-line thickness. By having these structural features molded into the standoff unit before adhesive application, the system ensures consistent adhesive layer thickness without requiring complex application processes or controlled dispensing. This preliminary structural definition enables both optimized curing time and consistent bond-line thickness simultaneously.
4Manufacturing precision
If glass beads are added to adhesive to maintain thickness, then the adhesive properties are improved, but the adhesive curing time increases and the process becomes more complex
Solution Approach 1:
The patent extracts the thickness control function from the adhesive composition itself and transfers it to the structural design of the standoff unit through protrusions on the bonding surface. Instead of relying on glass beads embedded in the adhesive to maintain thickness, the thickness control is built into the rigid structure of the standoff unit. This extraction of the thickness control mechanism from the adhesive allows the use of faster-curing adhesives without glass beads, thereby reducing curing time while maintaining precise thickness control.
Data Source
Figure 1~3
AI summary
The present invention relates to a composite standoff unit (100) for attaching on a mounting surface. The composite standoff unit (100) comprises a bottom platform (104), a standoff column (102), and a threaded portion (116) formed within said standoff column (102). The bottom platform (104) comprises a bonding surface (106) configured to be attached with said mounting surface. The bonding surface (106) comprises a plurality of nubs (118) of predefined dimension disposed in a spaced apart manner. The nubs (118) define a bond-line thickness between said bonding surface (106) and said mounting surface. The standoff column (102) extends vertically from said bottom platform (104). The standoff column (102) is formed with an inner cavity (110) and has a proximal end (112) and a distal end (114). The proximal end (112) is formed adjacent to said bottom platform (104), and the threaded portion (116) is disposed adjacent to said distal end (114) on said inner cavity (110).