Switch Case Partitioned Passages Dustproof Design
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Solution Overview
Problem
Conventional switches that prevent dust from entering through terminal holes either increase manufacturing costs due to insert molding or suffer from operational failures due to excessive grease usage.
Innovation Solution
A switch design featuring a main body with a partition wall and a blocking terminal portion that minimizes dust entry, combined with a reduced amount of viscous material used to seal gaps, reducing manufacturing costs and enhancing dustproof performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If terminals are insert-molded in the housing to prevent dust entry, then dustproof performance is improved, but manufacturing cost increases
Solution Approach 1:
The housing is divided into multiple chambers by partition walls, creating separate dustproof compartments. The terminal housing is segmented into a first chamber containing the common terminal and a second chamber containing the fixed contact terminal, with partition walls creating additional compartments. This segmentation allows dustproof protection without requiring complex insert-molding processes.
2Object-affected harmful factors
If a large amount of grease is spread between terminal and housing to prevent dust entry, then dustproof performance is improved, but manufacturing cost increases and operational failures occur
Solution Approach 1:
The invention extracts and eliminates the need for excessive grease by using the blocking portion structure. The blocking portion of the terminal physically blocks the passage, making grease unnecessary for dustproofing. This removes the source of operational failures caused by grease adhering to contacts while maintaining dustproof performance.
3Object-affected harmful factors
If partition wall is formed to minimize dust entry route, then dustproof performance is improved, but device complexity increases
Solution Approach 1:
The partition walls and blocking portions are integrated into the terminal structure itself rather than being separate components. The blocking portion is formed as an integral part of the terminal, combining the functions of the terminal electrode and the dustproof blocking structure, thereby reducing overall device complexity.
Data Source
AI summary
A switch designed for dustproof performance by minimizing a route of entry of dust from a terminal portion, includes a plurality of terminals, a movable contact piece that is supported in a manner allowing displacement between a non-conduction position and a conduction position, and a contact actuating member that displaces the movable contact piece in response to an externally applied pressing force. A main body of the switch includes an opening communicating with the outside, partition walls formed between the opening and the movable contact piece, barrier walls formed between the opening and the movable contact piece, and passages formed by ends of the barrier walls and walls that are opposite the ends of the barrier walls. Each partition wall extends across the corresponding passage and each terminal includes a connection portion and a blocking portion that is bent from the connection portion and blocks the corresponding passage.