Snap-Fit PCB Fastener for Screwless Mount Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The conventional use of screws for mounting printed circuit boards is complex, prone to misalignment, and results in material removal and increased production costs due to the need for specialized equipment and cleaning processes.
Innovation Solution
A snap-fit fastener and mount system that secures a circuit board without screws, utilizing snap-fit connections and engagement formations for resilient bracing, allowing for secure fixation and alignment without the drawbacks of screw-based systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are used to mount the circuit board, then secure fixation is achieved, but the process becomes complex and time-consuming requiring specialized equipment and cleaning
Solution Approach 1:
The patent replaces the screw-based mechanical fastening system with a snap-fit plastic fastener system. The fastener includes a mounting projection that snaps into a recess in the circuit board, eliminating threads, screwdrivers, and alignment requirements. This substitution maintains secure fixation while dramatically simplifying the mounting process and eliminating the need for specialized equipment.
Solution Approach 2:
The patent changes the mechanical parameters of the fastening system by transitioning from high-strength metal screws with threaded engagement to polymer fasteners with snap-fit engagement. The fastener uses elastic deformation of the mounting projection to create a secure connection, changing the engagement mechanism from friction-based threading to elasticity-based snapping, thereby simplifying the process.
2Strength
If screws are used for mounting, then fixation strength is achieved, but material is removed creating chips and particulates requiring cleaning
Solution Approach 1:
The patent replaces the thread-cutting screw mechanism with a snap-fit plastic fastener that engages with a molded recess. Instead of removing material through thread cutting, the fastener deforms elastically to snap into place, creating a secure connection without generating chips or particulates, thereby eliminating the need for cleaning operations.
3Reliability
If screws are used to mount the circuit board, then secure connection is achieved, but production cycle time increases due to alignment and cleaning requirements
Solution Approach 1:
The patent replaces the multi-step screw mounting process with a single snap-fit operation. The fastener's mounting projection is designed to align automatically with the recess, requiring minimal positioning effort. The snap-fit engagement occurs in one motion, eliminating the time required for thread engagement, torque application, and post-installation cleaning, thereby significantly reducing production cycle time.
Solution Approach 2:
The circuit board is pre-formed with a recess during the molding process, preparing the mounting location in advance. This preliminary action eliminates the need for post-assembly operations such as thread cutting and cleaning, allowing the fastener to be installed directly by snapping into the pre-prepared recess, thus accelerating production.
4Reliability
If screws are used for mounting, then fixation is achieved, but misalignment and damage risk increase due to complex alignment requirements
Solution Approach 1:
The patent replaces the precision alignment requirement of screw threads with a snap-fit recess geometry that guides the mounting projection into proper alignment. The recess acts as a self-aligning feature, tolerating greater positioning variations and eliminating the risk of mis-threading or cross-threading, thereby improving ease of operation while maintaining fixation reliability.
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 snap-fit system provides a secure, cost-effective, and efficient method for mounting circuit boards, reducing production cycle times and eliminating the need for specialized equipment, while allowing for easy replacement and flexible alignment with different mount configurations.
Implementation Method 1
the snap-fit connection formations provide a resiliently secured coupling
Data Source
AI summary
A coupling for connecting a circuit board to a mount with a fastener. The mount may be connected to a component. The fastener includes a first snap-fit connection formation for establishing a snap-fit connection with a second snap-fit connection formation provided on the mount. When connected, the fastener clamps the circuit board against the mount. The fastener further includes a first engagement formation configured to engage with a second engagement formation on the mount for bracing the snap-fit connection.