Rotary Locking Mounting Pin for Circuit Board Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional interface mounting structures for small-sized electronic devices lack structural strength and are inconvenient for manual installation, often resulting in damage to the mounting pin during connection with the circuit board's plughole due to the required radial compression and insertion force.
Innovation Solution
A mounting pin and plughole arrangement where the mounting pin is locked to the plughole through a rotary motion, featuring a shank with hooked portions that insert into border holes and locating blocks that engage retaining holes, allowing for secure locking without excessive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the mounting pin uses a small size (about 2 mm total length) to fit the small frame body, then the device size is reduced, but the installation becomes inconvenient and the mounting pin may be damaged due to excessive force required
Solution Approach 1:
The mounting pin incorporates a split shank design that allows radial compression during insertion, then expands to lock into the plughole. This dynamic transformation enables a small mounting pin to be installed without excessive force while maintaining secure fixation, resolving the contradiction between small size and ease of installation.
Solution Approach 2:
The mounting pin is divided into multiple functional segments: a split shank for compression and expansion, hooked portions for engagement, and locating blocks for positioning. This segmentation allows each part to perform its specific function, enabling easy installation of the small mounting pin into the plughole without damage.
2Reliability
If the mounting pin uses radial compression to insert hooked portions into the plughole, then the connection is achieved, but much more effort is required and the hooked portions may be damaged
Solution Approach 1:
The split shank design allows the mounting pin to dynamically compress radially during insertion and then expand to lock into the plughole. This dynamic behavior reduces the insertion force required while ensuring reliable connection, preventing damage to the hooked portions.
Solution Approach 2:
The mounting pin changes its physical parameters during installation: the split shank transitions from a compressed state during insertion to an expanded state for locking. This parameter change enables reliable connection with reduced insertion force, avoiding damage to the hooked portions.
3Strength
If the mounting pin is made longer to provide better engagement, then the connection strength is improved, but the device size increases and manual manipulation becomes more difficult
Solution Approach 1:
The mounting pin is segmented into functional zones: a short overall length for compact device size, with the split shank providing compression capability, hooked portions for engagement, and locating blocks for positioning. This segmentation achieves strong connection without increasing overall length, maintaining ease of manual manipulation.
Solution Approach 2:
Different parts of the mounting pin have specialized local qualities: the split shank for compression, hooked portions for engagement strength, and locating blocks for positioning. This local quality differentiation provides strong connection with a short mounting pin, avoiding increased device size while maintaining connection strength.
Data Source
AI summary
A mounting pin and plughole arrangement is disclosed include a plughole formed on a circuit board, and a mounting pin downwardly extending from a frame body and having a shank with two hooked portions for fastening to the plughole to lock the frame body to the circuit board by: inserting the shank of the mounting pin through the center of the plughole and then rotating the mounting pin through an angle to force top locating blocks of the hooked portions into engagement with retaining holes that form a part of the plughole.