Power Tool Electronic Mode Select Switch for Fastening Control
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Solution Overview
Problem
Existing power tools for fastening tasks, such as screwguns, often have limited speed and mode options, leading to damaged or broken fasteners, reduced productivity, and increased user fatigue due to the need for manual speed adjustment.
Innovation Solution
A power tool with a housing, motor, motor controller, transmission, and tool bit holder, featuring an electronic mode select switch that allows selection between multiple modes of operation, including manual high speed, manual low speed, push start mode, lock on mode, and rapid sequential modes, enabling more efficient and controlled fastening operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a power tool has one speed and one mode to cover all fastening variations, then the device complexity is reduced, but the reliability deteriorates due to damaged or broken fasteners
Solution Approach 1:
The power tool implements dynamic mode switching capability, allowing the motor to operate in multiple speeds and modes (e.g., high speed, low speed, rapid sequential, lock on) that can be changed during operation. This dynamic adaptability enables the tool to match different fastening requirements without increasing permanent structural complexity, thereby maintaining reliability across various fastening scenarios.
Solution Approach 2:
The system changes operational parameters (speed, mode) through electronic control rather than mechanical reconfiguration. The motor controller adjusts parameters based on selected modes, enabling the same physical hardware to deliver different performance characteristics. This parameter-based adaptability resolves the contradiction by providing multiple reliable operating states without increasing device complexity.
2Reliability
If a power tool has multiple speeds and modes, then the reliability improves to prevent damaged fasteners, but the device complexity increases
Solution Approach 1:
The power tool integrates multiple functions (high speed mode, low speed mode, rapid sequential mode, lock on mode) into a single device through electronic control. The same motor and transmission system serve all modes, with the motor controller managing different operational characteristics. This multi-functionality achieves high reliability across diverse fastening tasks without proportionally increasing device complexity.
Solution Approach 2:
The patent replaces mechanical speed control mechanisms (such as variable ratio gear systems or mechanical throttles) with electronic control. The motor controller uses electronic signals to regulate motor speed and mode, eliminating the need for complex mechanical transmission variations. This substitution maintains reliability while reducing mechanical device complexity.
3Reliability
If a user manually slows the screwgun down using partial trigger actuation, then the reliability improves to prevent damaged fasteners, but the productivity deteriorates due to reduced productivity and increased user fatigue
Solution Approach 1:
The power tool provides self-service speed control through automated mode selection. Instead of requiring the user to manually modulate trigger actuation, the system automatically selects appropriate speeds and modes (e.g., rapid sequential mode for multiple fasteners, lock on mode for single fasteners) based on the fastening task. This automation maintains reliability while eliminating the productivity penalty of manual speed adjustment.
Solution Approach 2:
The system incorporates feedback mechanisms that detect fastening progress and automatically adjust operation. Sensors or control logic monitor the fastening process and trigger mode changes accordingly (e.g., switching from high speed to low speed when resistance is detected). This feedback-based control maintains reliability without requiring continuous manual intervention, thereby preserving productivity.
4Adaptability or versatility
If an electronic mode select switch is added to provide multiple modes of operation, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The patent uses an electronic mode select switch that interfaces with the motor controller through electrical signals, replacing mechanical mode selection mechanisms (such as lever switches or position-dependent mechanical linkages). This electronic interface provides multiple adaptive modes (high speed, low speed, rapid sequential, lock on) with minimal mechanical complexity, as the electronic switch can be integrated into existing control circuits.
Solution Approach 2:
The mode selection function is merged with the existing motor control system. The electronic mode select switch does not operate independently but integrates with the motor controller and power switch, combining multiple control functions into a unified electronic control architecture. This merging approach enhances adaptability while minimizing additional device complexity by leveraging existing hardware components.
Data Source
AI summary
A power tool includes a housing, a motor disposed in the housing, a motor controller disposed in the housing and electrically coupled to the motor, and a transmission disposed in the housing and coupled to the motor. A tool bit holder is rotatably driven by the motor via the transmission and receives a tool bit for rotatably driving threaded fasteners. A power switch and an electronic model select switch are actuatable from outside the housing and are coupled to the motor controller. The power switch controls power delivery to the motor. The electronic mode select switch is configured to select between at least a first mode of operation in which power delivery to the motor is controlled by actuation of the power switch and an electronic lock on mode in which continuous power is delivered to the motor upon a single actuation and release of the power switch.