Self-Threading PCB Spacer for One-Sided Daughter Card Mounting
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Solution Overview
Problem
Existing modular electronic assemblies face challenges in easily replacing daughter modules of different sizes without damaging the modules or the board, as existing fixing arrangements require access from both sides and are not user-friendly for in-field changes.
Innovation Solution
A double-threaded connector or spacer that self-threads into the PCB mounting holes, allowing for the installation and replacement of modules of various sizes from one side, using a self-threading mechanism that deforms the PCB material to create matching threads, and can be unscrewed from the top for easy module exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solder in nut is installed using SMT soldering process, then the module can be securely mounted on the PCB, but the module cannot be easily exchanged or replaced in the field
Solution Approach 1:
The mounting system is divided into separate components: a spacer mounted on the PCB and a nut that attaches to the module. This segmentation allows the module to be removed and replaced without removing soldered components from the PCB, enabling field exchangeability while maintaining secure mounting.
Solution Approach 2:
A spacer acts as an intermediary component between the PCB and the module mounting hardware. The spacer is soldered to the PCB and provides threaded holes that receive nuts, allowing modules to be securely mounted and easily removed without affecting the soldered connection to the PCB.
2Ease of manufacture
If solder in nuts are provided in advance on the board, then modules can be mounted, but the nuts interfere with the location and positioning of modules
Solution Approach 1:
The system allows dynamic reconfiguration by enabling the removal and repositioning of spacers on the PCB. This flexibility allows the same PCB to accommodate modules of different sizes by moving spacers to appropriate locations, rather than having fixed, pre-positioned solder in nuts that interfere with module placement options.
3Ease of manufacture
If existing spacers and nuts are used, then modules can be mounted, but access from both sides of the carrier is required
Solution Approach 1:
Instead of requiring access from both sides of the PCB (traditional approach), the invention inverts the approach by providing a spacer with integrated threaded holes that can receive nuts from the same side as the module. This allows module mounting and removal to be performed from a single side, greatly improving user-friendliness for field operations.
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 adaptable and user-friendly post-factory installation and removal of daughter modules without damaging the modules or boards, facilitating the exchange of modules of different sizes without the need for solder removal or access from both sides.
Implementation Method 1
using a self-threading mechanism that deforms the PCB material to create matching threads
Data Source
Figure 1
Figure 2~3
Figure 4A~4E
AI summary
A double-threaded connector or spacer according may be self-threading such that insertion into a mounting hole in a PCB will cause the interior of the mounting hole to become threaded to match the double-threaded connector or spacer. The double-threaded connector or spacer installed in a mounting hole of a carrier. A "half circle" portion of daughter card is held in place between the double-threaded connector or spacer and screw. The half circle portion of the daughter card is plated to make electrical contact with the double-threaded connector or spacer, for example, to allow for grounding of the daughter card via the carrier, e.g., PCB.