Linear Slide Switch Integrates Power and Speed Control
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Solution Overview
Problem
Rotary power tools require multiple swipes of a slide switch to cover the entire speed range and often necessitate a separate power switch for ON/OFF functionality, leading to high current draw and mechanical switching challenges.
Innovation Solution
A linear slide switch integrated into the power tool's housing, aligned with the longitudinal axis, provides variable speed control and ON/OFF functionality in a single smooth motion, eliminating the need for a separate power switch and using a low-power switch implementation with conductive traces to manage power efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional slide switch is used for variable speed control, then the tool can be operated at different speeds, but multiple swipes are required to cover the entire speed range and a separate power switch is needed for ON/OFF functionality
Solution Approach 1:
The patent combines the power switch and variable speed slide switch into a single integrated switch mechanism. The switch lever performs both power ON/OFF functionality and variable speed control in one continuous linear motion, eliminating the need for separate switches and reducing operational steps.
Solution Approach 2:
The single switch mechanism serves multiple functions: it acts as both a power switch and a variable speed controller. By integrating these functions into one component, the patent reduces device complexity while maintaining comprehensive control capabilities.
2Reliability
If a mechanical switch with contact points is used to handle high current draw, then the switch can turn the tool on and off, but the mechanical complexity and power requirements increase
Solution Approach 1:
The patent replaces the mechanical contact points with a Hall effect sensor-based detection system. The Hall effect sensor detects the position of a magnet on the switch lever and generates electrical signals accordingly, eliminating mechanical wear and reducing complexity while maintaining reliability.
Solution Approach 2:
The Hall effect sensor acts as an intermediary between the mechanical switch lever and the electrical circuit control. The sensor converts mechanical position into electrical signals without direct electrical contact, reducing mechanical complexity while ensuring reliable signal transmission.
3Shape
If a circumferential slide switch following the housing curvature is used, then the switch fits the cylindrical configuration, but the switch path becomes longer requiring multiple swipes
Solution Approach 1:
The patent changes the switch movement from a circumferential path following the housing curvature to a linear path along the longitudinal axis of the housing. This dimensional change shortens the switch travel distance, allowing the entire speed range to be covered in a single swipe while maintaining compatibility with the cylindrical housing configuration.
Data Source
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AI summary
A power tool includes a slide switch which is configured to provide variable speed control of the rotational velocity of a drive member as well as provide ON/OFF functionality for the tool 10 based on the position of the switch. The slide switch eliminates the need for a separate switch for turning the tool on and off.