PCB Hook Retention Structure for Impact-Resistant Assembly
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Solution Overview
Problem
Electronic devices with hooks that fix printed circuit boards are prone to having the boards fall off due to external impacts causing the hooks to open.
Innovation Solution
An electronic device design featuring a housing with a fixing section including a movable hook and a fixed hook, where a movement restricting section is provided to limit the movement of the movable hook, preventing it from opening sufficiently to dislodge the electronic unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a movable hook is used to fix the electronic unit, then the assembly is simplified and the hook can accommodate position adjustments, but the hook may open due to external impacts causing the electronic unit to fall off
Solution Approach 1:
The fixing section is divided into two independent hooks: a movable hook for easy assembly and a fixed hook for reliable retention. The movable hook (71) can deflect to accommodate the electronic unit during assembly, while the fixed hook (72) remains stationary to prevent opening under impact, thus resolving the contradiction between ease of assembly and security of attachment.
Solution Approach 2:
Different hooks are assigned different functional properties: the movable hook has high flexibility for easy attachment, while the fixed hook has high rigidity for secure retention. This local differentiation of mechanical properties allows each hook to optimize its specific function, resolving the contradiction between ease of operation and reliability.
2Ease of operation
If the hook is made more flexible to ease assembly, then the hook can deflect during attachment, but the hook becomes more susceptible to opening under impact
Solution Approach 1:
The fixing function is segmented between two hooks with different mechanical properties. The movable hook (71) is designed with high flexibility to enable easy attachment by deflecting during assembly, while the fixed hook (72) is designed with high rigidity to resist impact forces and prevent opening, thus resolving the contradiction between ease of attachment and impact resistance.
Solution Approach 2:
Different local regions (hooks) are given different mechanical qualities: the movable hook has high elasticity for easy attachment, while the fixed hook has high strength for impact resistance. This spatial differentiation of material properties resolves the contradiction between ease of operation and strength.
3Reliability
If a fixed hook is used instead of a movable hook, then the attachment is more secure, but the assembly process becomes more difficult
Solution Approach 1:
The fixing system is segmented into two hooks with complementary functions: the movable hook (71) provides ease of assembly through its ability to deflect during attachment, while the fixed hook (72) provides security of attachment by remaining stationary and preventing opening under load, thus resolving the contradiction between reliability and ease of operation.
Solution Approach 2:
The fixing section merges the advantages of both movable and fixed hooks into a single integrated system. The movable hook contributes ease of assembly, while the fixed hook contributes security of attachment, and together they achieve both objectives simultaneously that neither could achieve alone.
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 design effectively prevents the electronic unit from falling off the hook when an impact is applied, ensuring secure attachment and easy assembly while minimizing the number of parts required.
Implementation Method 1
a fixing section provided to the housing and including a first hook that holds the electronic unit relative to the housing
Data Source
AI summary
An electronic device comprises a housing, an electronic unit attached to the housing, a fixing section provided to the housing and including a first hook that holds the electronic unit relative to the housing, and movement restricting section arranged relative to the first hook to restrict movement of the first hook.