Hook and Knob Printed Board Fixing Structure
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Solution Overview
Problem
Existing structures for fixing printed boards in electronic device units fail to prevent slippage during impact in the direction of removal and often complicate maintenance due to insufficient frictional resistance and complex disengagement mechanisms.
Innovation Solution
The structure incorporates hooks with recessed or protruding parts on the front face panel and engagement parts on the printed board housing body, along with knobs that allow for rotational engagement and easy release, enhancing impact resistance and facilitating maintenance by using a center part with a lower bending elastic modulus and V-shaped knobs for effective disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hooks are used for elastic engagement with engagement parts to fix the printed board, then the structure is simple and easy to operate, but the printed board may slip off when impact is exerted in the direction of removal
Solution Approach 1:
The engagement system is divided into two independent functional components: hooks for easy engagement/disengagement and protruding parts for impact resistance. The hooks provide elastic engagement for simple operation, while the protruding parts engage with recessed parts to prevent slippage during impact, resolving the contradiction between ease of operation and impact resistance
Solution Approach 2:
The invention merges two engagement mechanisms into a single integrated system: the elastic engagement of hooks with engagement parts provides easy operation, while the simultaneous engagement of protruding parts with recessed parts provides impact resistance. This combination allows both ease of operation and reliability to be achieved together
2Reliability
If recessed parts and protruding parts are used to prevent slippage during impact, then impact resistance is improved, but the printed board becomes difficult to remove during maintenance
Solution Approach 1:
The engagement system is segmented into two functional components: protruding parts that engage with recessed parts to prevent slippage during impact, and hooks with knobs that enable easy removal during maintenance. The protruding parts provide reliable impact resistance while the hooks with knobs provide ease of repair by allowing simple disengagement
Solution Approach 2:
The hooks are designed with elastic properties and knobs that allow dynamic engagement and disengagement. During normal operation, the hooks remain engaged with engagement parts. During maintenance, pinching the knobs allows the hooks to elastically deform and disengage from the engagement parts, enabling easy removal while maintaining impact resistance during normal use
3Device complexity
If frictional forces from elastic engagement are used to resist impact, then the structure is simple, but the frictional forces cannot withstand great magnitude impact
Solution Approach 1:
The force resistance system is segmented into two components: hooks that provide simple elastic engagement for structural simplicity, and protruding parts that engage with recessed parts to provide additional mechanical interlocking for withstanding great magnitude impact forces
Solution Approach 2:
The invention merges two force resistance mechanisms: the elastic frictional engagement of hooks and the mechanical interlocking of protruding parts with recessed parts. This combination maintains structural simplicity while significantly increasing the total force resistance capability to withstand great magnitude impact
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 effectively prevents the printed board from slipping off during impact and allows for easy removal by maintaining engagement until intentionally released, thereby improving both impact resistance and maintenance accessibility.
Implementation Method 1
a center part 3c that is located at general center of each of the knobs 3b and that is configured so as to have a bending elastic modulus lower than the other parts of the knob have
Implementation Method 2
forces arising from impact in the direction (direction of an arrow C in FIG. 3) of removal of the printed board 1 during transportation, for instance, as illustrated in FIG. 3, are received by the hooks 3a on the front face panel 3 that are in elastic engagement with the engagement parts 2d of the printed board housing body 2, however, there is fear that the impact of great magnitude might cause the hooks 3a to slide, since frictional forces caused by the elastic engagement could not withstand such an impact
Data Source
AI summary
An electronic device unit includes a printed board housing body, a printed board, and a front face panel to which the printed board is fixed. The front face panel is provided with hooks each having a tip provided with a recessed part and knobs for disengaging the hooks. The printed board housing body includes engagement parts each provided with a protruding part to fit with the recessed part of each hook. Pinching the knobs for removing the front face panel from the printed board housing body causes the hooks turn in directions such that engagement between the hooks and the engagement parts and fitting between the recessed parts and the protruding parts are released.