Connector Latching Arms for PCB Vibration Resistance
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Solution Overview
Problem
Existing connectors face challenges in securing the primary fuse to the printed circuit board, particularly under increased loads and vibration, while maintaining secure contact and tolerance compensation.
Innovation Solution
The connector design incorporates at least two latching arms with different geometries on the fuse cover, which extend to secure the contact carrier in place, providing orthogonal and sloping latching surfaces to ensure the primary fuse is locked onto the printed circuit board, preventing unintentional disconnection and accommodating board thickness variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single latching geometry is used on the primary fuse, then the structure is simple, but the connector cannot withstand higher loads and vibrations securely
Solution Approach 1:
The latching arm is divided into two distinct segments: a first latching geometry with a first latching surface and a second latching geometry with a second latching surface. Each geometry serves a specific function - one for basic retention and the other for enhanced security under load and vibration, allowing the system to achieve high reliability without requiring a completely different latching mechanism
Solution Approach 2:
Different regions of the latching arm are given different geometrical properties. The first latching geometry provides a specific surface orientation for initial attachment, while the second latching geometry provides a different surface orientation for securing under stress. This local differentiation of qualities allows the single latching arm to handle multiple operational conditions effectively
2Strength
If the connector is designed for secure fixing, then it can withstand higher loads, but removal becomes destructive
Solution Approach 1:
The latching arm is designed to be movable between a locked position (where both latching geometries engage with the circuit board) and an unlocked position (where the contact carrier can be removed). This dynamic capability allows the connector to provide strong, secure attachment during operation while enabling non-destructive removal when needed, simply by actuating the release mechanism to move the latching arm
3Ease of manufacture
If the latching arm structure is simplified, then manufacturing is easier, but tolerance compensation for board thickness variations is reduced
Solution Approach 1:
The first and second latching geometries are designed with asymmetric characteristics relative to each other, with different surface orientations and engagement characteristics. This asymmetry allows the latching arm to accommodate variations in circuit board thickness - the first geometry engages at one orientation while the second geometry engages at a different orientation, providing tolerance compensation without requiring complex adjustable mechanisms
Data Source
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AI summary
Described and illustrated is a connector, in particular a direct connector for contacting contact openings of a printed circuit board, with a contact carrier which may have coding means, in particular coding pins and a reverse polarity protection, in particular in the form of polarity projections, with conductor insertion channels formed by the contact carrier for receiving connecting conductors and with contact recesses for receiving plug contacts, with a retaining cover which surrounds the contact carrier, wherein the contact carrier is slidably movable in the retaining cover in the plugging direction of the connector between an assembly position and a pre-assembly position, with a primary locking device which holds the connector to the printed circuit board and which is part of the retaining cover, wherein the primary locking device is movable from a locked position to a released position.wherein the contact carrier, in its mounting position within the fuse hood, holds the primary fuse in its locked position.