Trigger Switch Contact Layout to Suppress Sliding Electrode Wear
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Solution Overview
Problem
Existing trigger switches suffer from wear issues due to vibrations transmitted to the sliding electrode part when driving a device, leading to deteriorated contact reliability between the brush and electrode.
Innovation Solution
A trigger switch design where the sliding electrode part moves from an on-position contacting a fixed electrode to an off-position, releasing contact with a fixing member, thereby preventing wear by avoiding contact with the substrate during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the brush maintains contact with the resin surface during drive part operation, then the drive part can be driven, but the brush experiences wear due to vibrations and sliding
Solution Approach 1:
The patent extracts the harmful contact between the brush and resin surface by introducing a movable electrode that can be separated from the substrate. The brush contacts only the movable electrode, which is electrically connected to the fixed electrode through a flexible printed circuit board, thereby eliminating direct contact with the resin surface while maintaining electrical connectivity for drive part operation.
Solution Approach 2:
The patent introduces a movable electrode as an intermediary element between the brush and the fixed electrode. This movable electrode serves as a mediator that transfers electrical contact function from the brush-resin interface to the brush-movable electrode interface, while the flexible printed circuit board acts as another intermediary to maintain electrical connection to the fixed electrode without requiring brush contact with the resin surface.
2Reliability
If the brush contacts the resin surface during operation, then electrical connection is maintained, but wear occurs leading to deteriorated contact reliability
Solution Approach 1:
The patent extracts the brush from direct contact with the resin surface by introducing a movable electrode. The brush now contacts only the movable electrode, which is periodically separated from the fixed electrode during operation, thereby eliminating continuous sliding wear on the brush while maintaining electrical connection through the flexible printed circuit board.
Solution Approach 2:
The patent introduces dynamic separation between the movable electrode and fixed electrode during drive part operation. The movable electrode is positioned to contact the fixed electrode only when the drive part is stopped, and is separated when the drive part operates, creating a dynamic contact system that reduces wear while maintaining electrical connectivity through the flexible printed circuit board during operation.
Data Source
AI summary
A trigger switch capable of suppressing wear of a sliding electrode part and a device including the trigger switch are provided. A trigger switch includes a front sub-brush and a rear sub-brush that, when a drive part is driven by a movement of a trigger caused by a push-in operation to the trigger, move from an on-position where they contact a front sub-electrode and a rear sub-electrode on a substrate to an off-position where they do not contact the front sub-electrode and the rear sub-electrode. As the front sub-brush and the rear sub-brush move from the on-position to the off-position, a contact between the front sub-brush and the rear sub-brush and the substrate are released.