Trigger Switch Terminal Fixing Mechanism for Vibration Resistance
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Solution Overview
Problem
In power tools like electric screwdrivers, the limited space for housing a trigger switch leads to a decrease in fixing strength due to vibrations, causing contact failures and axial component detachment when using conventional fixing methods for components like diodes.
Innovation Solution
A trigger switch design featuring a housing with a contact mechanism, first and second terminals with plate shapes, and axial components with leads fixed using a combination of fixing and fall-off prevention portions on the terminals to secure the components externally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If axial components are fixed to terminals outside the housing to save space, then the space utilization is improved, but the fixing strength decreases due to vibrations causing contact failures
Solution Approach 1:
The terminal is divided into two distinct functional portions: a fixing portion for electrical connection and a fall-off prevention portion for mechanical retention. This segmentation allows each portion to optimize its specific function, with the fixing portion providing electrical connectivity and the fall-off prevention portion providing vibration resistance through a locking mechanism
Solution Approach 2:
The fall-off prevention portion acts as an intermediary locking mechanism between the axial component and the terminal. It includes a locking protrusion that engages with a corresponding groove on the axial component, creating an intermediate locking structure that prevents detachment while allowing the primary fixing portion to maintain electrical connection
2Device complexity
If axial components are fixed outside the housing, then the device complexity is reduced, but the reliability under vibration decreases due to contact failures
Solution Approach 1:
The fixing portion and fall-off prevention portion are merged into a single integrated terminal structure. This combining approach maintains device simplicity by using one component to perform both electrical connection and mechanical retention functions, eliminating the need for separate fixing mechanisms while ensuring reliable contact under vibration
Data Source
AI summary
A trigger switch includes a housing including a casing; a trigger coupled to the housing to be capable of approaching and separating from the housing; a contact mechanism including a fixed contact and a movable contact making contact with and separating from the fixed contact in conjunction with approaching and separating operation of the trigger with respect to the housing; a first terminal electrically connected to the contact mechanism; and a second terminal electrically connected to the contact mechanism. The first terminal includes a first fixing portion that connects and fixes the first lead, and a fall-off prevention portion that locks the first lead at a position different from the first fixing portion in an axial direction of the first lead to prevent the axial component from falling off. The second terminal includes a second fixing portion that connects and fixes the second lead.