Trigger Switch Terminal Externalization for Housing Miniaturization
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Solution Overview
Problem
The miniaturization of trigger switch housings for power tools is hindered by the space occupied by power connection terminals, making it difficult to reduce the size and weight of these tools.
Innovation Solution
The design includes a housing with a trigger that can approach and separate, a contact mechanism with fixed and movable contacts, and plate-shaped terminals extending from the housing, with wire connection portions located outside the housing, allowing for external wire connections and reducing the internal space required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If power connection terminals are provided inside the housing, then electrical connection is achieved, but the housing size cannot be reduced
Solution Approach 1:
The patent applies dimensionality change by moving the wire connection portions from the internal space of the housing to external locations on the terminal bodies. The terminals extend outward from the housing, and the wire connection portions are positioned at the external ends of these terminals, utilizing the external dimension rather than consuming internal housing volume. This resolves the contradiction by achieving electrical connection functionality without occupying housing space that would otherwise be available for miniaturization.
2Volume of moving object
If wire connection portions are located outside the housing, then housing space is reduced, but terminal structure becomes more complex
Solution Approach 1:
The patent merges the terminal body and wire connection portion into a single integrated component. The terminal body extends from the housing and incorporates the wire connection portion at its external end, eliminating the need for separate internal terminal structures and wire routing mechanisms. This merging simplifies the overall terminal structure while achieving the goal of reducing housing volume, as the combined structure requires fewer parts and assembly steps compared to traditional separate internal terminals.
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; a first terminal extending from outside of the housing to the casing; and a second terminal extending from outside of the housing to the casing and including a plate surface facing a plate surface of the first terminal. A first wire connection portion capable of connecting a conductor portion of a first wire is provided to an end of the first terminal located outside of the housing in an extending direction of the first terminal, and a second wire connection portion capable of connecting a conductor portion of a second wire is provided to an end of the second terminal located outside of the housing in an extending direction of the second terminal.