Circuit Board Fall-Out Prevention Structure
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Solution Overview
Problem
Circuit boards in devices like numerical control devices tend to fall out due to vibration, shock, or unintentional cable pulling, as existing insertion and extraction levers lack a locking mechanism, leading to instability during operations.
Innovation Solution
A circuit board fall-out prevention structure that includes a recess-protrusion mechanism between the insertion and extraction lever and the circuit board, allowing for secure engagement perpendicular to the insertion and extraction direction, preventing the board from falling out without increasing the number of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple insertion and extraction lever is used, then ease of operation is improved, but reliability deteriorates due to lack of locking mechanism causing circuit board to fall out during vibration or shock
Solution Approach 1:
The recess-protrusion structure is integrated within the insertion and extraction lever assembly, with the protrusion formed on the lever body and the recess formed on the circuit board. This nested configuration allows the locking mechanism to be contained within the existing lever structure without adding separate external components, thereby maintaining ease of operation while improving reliability through automatic locking engagement during vibration or shock conditions
2Reliability
If a locking mechanism is added to prevent circuit board fall-out, then reliability is improved, but device complexity increases due to additional parts
Solution Approach 1:
The locking function is merged with the existing insertion and extraction lever by forming the protrusion on the lever body and the corresponding recess on the circuit board. This integration combines the locking mechanism with the operational lever into a single unified structure, eliminating the need for separate locking components and reducing overall device complexity while maintaining improved reliability
Solution Approach 2:
The recess-protrusion structure enables automatic locking engagement through the mechanical interaction between the protrusion on the lever and the recess on the circuit board during normal insertion and extraction operations. The mechanism self-activates through the existing lever movement without requiring additional actuators, sensors, or control systems, thereby improving reliability while avoiding increases in device complexity
3Ease of operation
If the insertion and extraction lever is made flexible for easy operation, then ease of operation is improved, but stability deteriorates under vibration and shock
Solution Approach 1:
The recess-protrusion locking structure is nested within the lever-circuit board connection interface, with the protrusion formed on the lever body fitting into the recess on the circuit board. This nested configuration provides mechanical interlocking that stabilizes the connection during vibration and shock while maintaining the flexible lever's ease of operation, as the locking feature is integrated into the existing flexible structure rather than adding rigid external constraints
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
Effectively prevents circuit board ejection during vibrations or cable pulling by engaging the recess-protrusion mechanism, ensuring reliable retention without additional components, suitable for applications in machine tools and similar environments.
Implementation Method 1
a recess-protrusion 13 capable of being hooked between the insertion and extraction lever 12 and the circuit board 11
Data Source
AI summary
A circuit board fall-out prevention structure includes: a housing; a circuit board fitted to the housing in an insertable and extractable manner; an insertion and extraction lever supported with a shaft rotatably with respect to the circuit board and capable of being hooked on the housing to facilitate an insertion and extraction operation of the circuit board; and a recess-protrusion capable of being hooked between the insertion and extraction lever and the circuit board after insertion of the circuit board in a direction different from an insertion and extraction direction of the circuit board.