Variable Speed Trigger Mechanism for Power Tools
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Solution Overview
Problem
Conventional power tools require separate triggers or levers for controlling motor speed and direction, which are costly to manufacture and inconvenient to use, as they necessitate additional switching actions.
Innovation Solution
A variable speed toggle switch mechanism that integrates mechanical interconnections to allow a single trigger to control both the rotational direction and power supply to a motor, enabling variable speed control without the need for a separate reversing lever.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate triggers or levers are used for controlling motor speed and direction, then the control functions are distinct and reliable, but the device complexity increases and manufacturing costs increase
Solution Approach 1:
The patent combines the reversing lever and variable speed trigger into a single integrated trigger mechanism. The trigger assembly includes a trigger body with a trigger finger that can be actuated in multiple directions: laterally for reversing motor direction and longitudinally for controlling motor speed. This merging of previously separate control functions into one unified mechanism reduces device complexity and manufacturing costs while maintaining reliable control functionality.
2Reliability
If separate triggers or levers are used for controlling motor speed and direction, then the control functions are distinct, but the ease of operation decreases due to additional switching actions
Solution Approach 1:
The single trigger assembly is designed to perform multiple functions: it can reverse motor direction by lateral actuation and control motor speed by longitudinal actuation. This multi-functional design eliminates the need for separate reversing levers and speed triggers, allowing users to control both direction and speed with one unified control mechanism, thereby improving ease of operation while maintaining reliable control functions.
3Manufacturing precision
If dual triggers or levers are used for direction and speed control, then the control precision is high, but the manufacturing cost increases
Solution Approach 1:
The patent integrates the reversing lever and variable speed trigger into a single trigger assembly, reducing the number of separate components that need to be manufactured and assembled. This merging approach maintains control precision through the mechanical interconnections within the unified trigger mechanism while significantly reducing manufacturing costs by eliminating redundant parts and assembly steps associated with separate control levers.
Data Source
AI summary
A variable speed trigger mechanism that allows a user to reverse a direction of a motor and supply variable amounts of power to the motor using a single trigger mechanism. In a first motion, the user can actuate the reversing module to change the direction of the motor coupled to the trigger mechanism. In a second motion, the user can actuate the same trigger and apply variable amounts of power to the motor.