Housing Post Dual Locking for Circuit Board Vibration
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Solution Overview
Problem
Existing electrical connector housings secured to circuit boards via press-fit connections often loosen due to vibrations, leading to instability and potential wear or damage over time.
Innovation Solution
The electrical assembly employs a mounting clip with a dual locking mechanism, including primary and secondary locking operations, where press-fit ribs provide an initial securement and staking of posts enhances the retention force, ensuring the housing remains firmly attached to the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If press-fit connection is used to secure housing to circuit board, then ease of manufacture is improved, but reliability deteriorates due to loosening under vibration
Solution Approach 1:
The connection mechanism is divided into multiple functional segments: press-fit ribs for initial positioning and electrical contact, and staking features for mechanical locking. This segmentation allows each feature to perform its specific function optimally while working together to solve the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The press-fit ribs perform a preliminary action by securing the housing to the circuit board during assembly, providing initial positioning and electrical contact. The staking features then perform a secondary locking action to prevent loosening under vibration, combining ease of initial assembly with long-term reliability.
2Device complexity
If simple press-fit connection is used, then device complexity is reduced, but stability deteriorates over time under vibration
Solution Approach 1:
Multiple connection features are merged into a single integrated housing structure: press-fit ribs, staking features, and alignment features are all formed as part of the housing. This merging maintains relatively simple device complexity while achieving enhanced stability through the combined action of these features.
Solution Approach 2:
The physical state and geometry of the posts are changed through the staking process, which deforms the posts to create interference-fit locking. This parameter change transforms the connection from a simple press-fit to a mechanically locked connection, improving stability without significantly increasing device complexity.
3Ease of operation
If housing is secured with press-fit connection, then ease of operation is improved during assembly, but durability deteriorates due to wear and damage from loosening
Solution Approach 1:
The press-fit ribs perform a preliminary securing action that is easy to execute during assembly, providing initial attachment and electrical contact. The staking features then perform a secondary action that locks the connection to prevent future loosening, thereby extending the duration of reliable operation.
Solution Approach 2:
The staking features provide beforehand cushioning against future vibration and stress by creating a mechanically locked connection before the housing is subjected to service conditions. This prevents wear and damage that would otherwise occur from loosening over time.
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
This configuration significantly improves the stability and security of the electrical assembly by providing a primary holding force through press-fit ribs and a secondary holding force through staking, effectively preventing loosening and maintaining a secure connection even under harsh conditions.
Implementation Method 1
press-fit ribs provide an initial securement
Implementation Method 2
press-fit ribs provide a primary holding force
Implementation Method 3
staking of posts enhances the retention force
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An electrical assembly (100) including a housing (102) extending between front and rear ends (126, 128). The housing (102) including a post (350) extending between a base end (352) and a free (354) that is loaded into a passage (136) of a circuit board (110) and engages the circuit board (110) in a primary locking operation such that the post (350) secures the housing (102) to the board (110) by a primary holding force. A contact (116) is received in the housing (102) and has a mating end (158) at the front end (126) of the housing (102) for mating with a mating electrical assembly (120) and a terminating end (160) at the rear end (128) of the housing (102) for electrical connection with the board (110). The free end (354) of the post (350) is locked to the rear side (132) of the board (110) by a secondary locking operation that secures the housing (102) to the board (110) by a secondary holding force that is greater than the primary holding force.