Link Unit Automates Speed Selection in Impact Driver Mode Switching
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Solution Overview
Problem
Conventional electric power tools require manual manipulation of both mode and speed switching members, leading to cumbersome operation and potential performance decreases, especially when switching to high-speed modes like vibration drill or impact modes, as users often forget to switch to high-speed mode, resulting in temporary stops to adjust settings.
Innovation Solution
A link unit is introduced between the mode switching member and the speed switching member, ensuring that the speed switching member is automatically set to high-speed mode when the mode switching member selects a predetermined operation mode, eliminating the need for separate speed switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mode switching member and a speed switching member are provided separately, then the speed can be selected in each operation mode, but the operation becomes cumbersome and user-friendliness decreases
Solution Approach 1:
The patent combines the mode switching member and speed switching member into a single integrated switching mechanism. The mode switching member simultaneously controls both operation mode selection and speed selection, eliminating the need for separate speed switching operations. This merging resolves the contradiction by maintaining adaptability (speed selection in each mode) while improving ease of operation (single member control).
Solution Approach 2:
The mode switching member is designed to perform multiple functions: selecting operation modes (drill, impact, vibration drill) and selecting speeds (high-speed, low-speed) within each mode. This multi-functionality allows the single switching member to provide comprehensive control, resolving the contradiction between versatility and operational simplicity.
2Adaptability or versatility
If separate mode switching and speed switching members are used, then comprehensive control is achieved, but productivity decreases due to temporary stops for adjustment
Solution Approach 1:
By merging mode switching and speed switching into a single integrated mechanism, the patent eliminates the need for separate adjustment operations. Users can switch modes and speeds simultaneously with one operation, preventing work interruptions and maintaining productivity while achieving comprehensive control.
Solution Approach 2:
The integrated switching mechanism performs both mode selection and speed selection in a single preliminary action. When the user operates the mode switching member, the speed is automatically set appropriately for the selected mode, eliminating the need for subsequent speed adjustments and preventing work interruptions.
3Adaptability or versatility
If two switching members are provided, then flexible operation mode selection is enabled, but device complexity increases
Solution Approach 1:
The patent merges two separate switching members into one integrated switching mechanism. This consolidation reduces the number of components and simplifies the overall structure while maintaining the flexibility to select different operation modes and speeds through the single unified interface.
Solution Approach 2:
The single switching member is designed with multi-functionality to handle both mode selection and speed selection. This universal design reduces device complexity by eliminating redundant components while preserving comprehensive control capabilities through intelligent functional integration.
Data Source
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AI summary
In an impact driver, a link unit (a link sleeve (63) and first and second elongated protrusions (88A, 88B)) is provided between the mode switching ring (64) for selecting an operation mode and the slide button (34) for selecting the rotation speed. With the link unit, a switching operation of a slide button (34) to the high-speed side is performed in coordination with a selecting operation of a mode switching ring (64) to an impact mode or a vibration drill mode and the rotation speed is held at high speed.