Composite Threaded Standoff With Nub-Controlled Adhesive Bond Line
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Solution Overview
Problem
Conventional standoff units have complex assembly processes, increased carbon footprint, and excess adhesive weight due to multiple components and inadequate adhesive application, which complicates structural integrity and weight management in aerospace and automotive applications.
Innovation Solution
A composite standoff unit with a molded threaded portion and bonding surface featuring predefined nubs for optimal adhesive thickness, reducing components and weight, and eliminating the need for additional applicators and glass beads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate components are used in conventional standoff units, then the threaded portion can be securely assembled, but the assembly process becomes complex and increases production time
Solution Approach 1:
The patent combines the standoff column and threaded portion into a single composite molded unit. The threaded portion is directly formed within the standoff column as an integrated feature, eliminating the need for separate threading operations and multiple component assemblies. This merging reduces assembly complexity while maintaining secure assembly through the monolithic structure.
Solution Approach 2:
The threaded portion is nested within the standoff column as an internal feature. The threading is formed inside the column body, allowing the clamp to be screwed onto the standoff unit in a single operation without requiring separate threading steps or additional components. This nesting approach simplifies the overall assembly process.
2Ease of manufacture
If adhesive is applied without controlled thickness, then application is simple, but excess adhesive increases weight
Solution Approach 1:
The patent incorporates protrusions on the bonding surface that pre-establish the desired adhesive thickness before adhesive application. These protrusions act as spacers that automatically control the bond line thickness, eliminating the need for manual thickness control while preventing excess adhesive application. The preliminary geometric feature ensures optimal adhesive用量 and weight.
3Manufacturing precision
If glass beads are added to adhesive for thickness control, then bond-line thickness is standardized, but the adhesive formulation becomes more complex and curing time increases
Solution Approach 1:
The patent replaces the chemical/mechanical approach of using glass beads for thickness control with a purely geometric mechanical feature. The protrusions on the bonding surface provide physical spacing that controls adhesive thickness without requiring any additives or modifications to the adhesive formulation. This substitution eliminates curing time extensions while maintaining precise thickness control.
Solution Approach 2:
The patent changes the approach from modifying adhesive properties (adding glass beads) to modifying the substrate geometry (adding protrusions). This parameter change shifts the thickness control mechanism from the adhesive side to the bonding surface side, allowing use of standard adhesive formulations with optimal curing characteristics while achieving precise bond-line thickness control.
4Reliability
If multiple molding and assembly steps are used, then the threaded portion can be properly formed, but production time and carbon footprint increase
Solution Approach 1:
The patent merges the molding of the standoff column and the formation of the threaded portion into a single composite molding operation. The threaded features are directly formed as integral parts of the column during the same molding cycle, eliminating separate threading steps and reducing the number of assembly operations. This maintains threaded portion quality through precise mold-based formation while significantly improving productivity.
Data Source
AI summary
A composite standoff unit for attaching on a mounting surface includes a bottom platform, a standoff column, and threaded portion formed within the standoff column. The bottom platform includes a bonding surface configured to be attached with the mounting surface. The bonding surface includes a plurality of nubs of predefined dimension disposed in a spaced apart manner. The nubs define a bond-line thickness between the bonding surface and the mounting surface. The standoff column extends vertically from bottom platform. The standoff column is formed with an inner cavity that has a proximal end and a distal end. The proximal end is formed adjacent to the bottom platform, and the threaded portion is disposed adjacent to the distal end on the inner cavity.