Linear Slide Switch Actuator for Power Tool 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 have a separate switch for turning the tool on and off, which is inconvenient for users.
Innovation Solution
A linear slide switch with a slide potentiometer and actuator that provides variable speed control and ON/OFF functionality in a single smooth motion, eliminating the need for a separate ON/OFF switch and allowing seamless transition from OFF to maximum speed.
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 controlled to operate at different speeds, but multiple swipes of the dial are required to cover the entire speed range and a separate switch is needed for turning the tool on and off
Solution Approach 1:
The patent combines the ON/OFF switch and variable speed control into a single integrated slide switch mechanism. The actuator serves dual purposes: it controls power delivery through ON/OFF contacts while simultaneously adjusting motor speed through the slide potentiometer, eliminating the need for separate switches and reducing operational steps
Solution Approach 2:
The slide switch assembly performs multiple functions within a single component: it acts as both a power switch (ON/OFF) and a variable speed controller. The actuator mechanically engages both the ON/OFF lever arm for power control and the slide potentiometer for speed regulation, making the device universal for both switching and continuous speed adjustment
2Productivity
If a circumferential slide switch is used, then variable speed control is achieved, but the switch lever must follow the curvature of the cylindrical housing requiring multiple swipes
Solution Approach 1:
The patent inverts the traditional circumferential arrangement of the slide switch into a linear configuration. Instead of the actuator moving along a curved path following the cylindrical housing, the actuator moves linearly along the longitudinal axis, with the slide potentiometer and ON/OFF contacts arranged to engage during this linear motion, reversing the conventional design approach
3Adaptability or versatility
If a separate ON/OFF switch is provided in addition to the slide switch, then the tool can be turned on and off independently, but the device complexity increases
Solution Approach 1:
The patent merges the ON/OFF switching function and variable speed control into a single integrated mechanism. The actuator simultaneously controls both functions through its linear motion, eliminating the need for separate switches and reducing overall device complexity while maintaining full adaptability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables intuitive and efficient control of rotary power tools with a single motion, improving user experience by consolidating speed control and ON/OFF functions into a linear path aligned with the tool's longitudinal axis.
Implementation Method 1
a slide potentiometer that outputs the variable speed selection signal
Implementation Method 2
A variable speed motor is supported by the housing, and a drive member is coupled to the motor
Data Source
AI summary
A power tool includes a variable speed motor coupled to a drive member. A power circuit electrically connects the variable speed motor to a power source. A variable speed signal generator generates a variable speed control signal indicating an operating speed for the motor. The operating speed is dependent upon a value of a variable speed selection signal generated by a slide switch. The slide switch includes a linear slide potentiometer for generating the variable speed selection signal. An actuator slides along the potentiometer to control the value of the selection signal. The slide switch includes an ON/OFF contact and a lever arm that is movable into and out of contact with the ON/OFF contact. The actuator is configured to prevent the lever arm from contacting the ON/OFF contact when the actuator is in an OFF position in relation to the slide potentiometer thereby opening the power circuit.