Card Edge Connector Locking Arm Hook Design
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Solution Overview
Problem
Existing card edge connectors lack reliable locking mechanisms to prevent incorrect insertion and deformation, leading to unstable electrical connections between the connector and daughter PCBs.
Innovation Solution
The design incorporates resilient locking arms with a hook and restricting arm to prevent downward movement when the card is not inserted correctly, and a tab to limit deformation, ensuring proper alignment and stable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the locking arm uses a slant arc configuration for the handle, then the card can be easily inserted and locked, but the card can also be incorrectly pressed downward when not inserted to the predetermined position
Solution Approach 1:
The locking arm is segmented into distinct functional zones: the slant arc handle for easy operation, the engaging portion with pressing surface for locking, and the connecting arm with restricting portion for preventing incorrect insertion. Each segment performs a specific function to resolve the contradiction between ease of operation and reliability.
Solution Approach 2:
The restricting portion acts as an intermediary element between the connecting arm and the card. It mediates the interaction by providing a physical barrier that prevents the card from being pressed downward when not properly inserted, while allowing normal locking operation when the card is correctly positioned.
2Device complexity
If the connecting arm and restricting portion lack upward limitation, then the structure remains simple, but the restricting portion may be torsionally deformed when the card is incorrectly uplifted
Solution Approach 1:
The insulative housing provides preliminary anti-action by constraining the connecting arm within a defined space. This pre-established constraint prevents torsional deformation of the restricting portion when the card is incorrectly uplifted, while maintaining the overall simplicity of the locking arm structure.
Solution Approach 2:
The insulative housing is designed in advance to define a card-receiving slot with specific geometric constraints. This preliminary structural preparation ensures that the connecting arm and restricting portion are automatically positioned and constrained, preventing deformation before incorrect insertion can occur.
3Reliability
If the engaging portion presses against the card when installed, then the card is securely locked, but the card may be pressed downward even when not inserted to the predetermined position
Solution Approach 1:
The restricting portion serves as an intermediary barrier between the engaging portion's pressing action and the card. When the card is not properly inserted, the restricting portion blocks the pressing force, preventing harmful downward pressure while allowing secure locking when the card is correctly positioned.
Solution Approach 2:
The locking arm exhibits local quality differences: the engaging portion has pressing capability for secure locking, while the restricting portion has blocking capability to prevent incorrect insertion. This localized functional differentiation resolves the contradiction between reliable locking and prevention of harmful pressure.
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 solution provides foolproof locking and prevents deformation, ensuring stable electrical connections by resisting incorrect insertion and limiting movement, thus enhancing the reliability of the card edge connector.
Implementation Method 1
a resilient arm extending forwardly from the retaining portion. The resilient arm is deformable outwardly so as to lock or unlock with the card
Implementation Method 2
The engaging portion includes a downwardly inclined surface for guiding installation of the card
Data Source
AI summary
A card edge connector includes an insulative housing, a number of contacts and a pair of locking arms for holding a card. Each locking arm includes a retaining portion fixed to the insulative housing and a resilient arm extending forwardly from the retaining portion. The resilient arm is deformable outwardly so as to lock or unlock with the card. The resilient arm includes an engaging portion extending inwardly and a hook at a front of the engaging portion. The engaging portion includes a downwardly inclined surface for guiding installation of the card. The hook protrudes upwardly beyond the engaging portion so that when the card is not so inserted along a card-insertion direction, even if the card is downwardly pressed, a top edge of the hook resists against the card so as to prevent the card from further downward movement.