Power Tool Fastener Mode Control to Prevent Sheet Metal Stripping

Solution Overview

Problem

Existing power tools lack the ability to differentiate between forward and reverse operations for sheet metal fasteners, leading to inefficiencies and potential stripping of fasteners during use.

Innovation Solution

A power tool with a controller that adjusts operating parameters based on forward or reverse direction, using sensors to monitor and adjust motor speed, torque, and other parameters to prevent fastener stripping, and provides alerts when stripping occurs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the power tool uses the same operating parameters for both forward and reverse operations, then the control system is simple, but the fastener may be stripped during operation

Engineering Contradiction:

Improvefastener retentionVSAvoidcontrol system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The controller dynamically adjusts motor operating parameters based on the direction of rotation. When reverse operation is detected, the controller modifies parameters such as motor speed, torque limits, and ramp rates to prevent fastener stripping. This dynamic adaptation allows the system to maintain reliability without requiring overly complex manual intervention.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses sensors to detect the direction of motor rotation and provides feedback to the controller. Based on this feedback, the controller automatically selects appropriate operating parameters for forward or reverse operation, preventing fastener stripping while maintaining relatively simple overall system architecture.

Inventive Principle:

Principle #23Feedback

2Reliability

If the power tool uses different operating parameters for forward and reverse operations, then fastener stripping is prevented, but the control system becomes more complex

Engineering Contradiction:

Improvefastener retentionVSAvoidcontrol system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The controller dynamically adjusts motor operating parameters based on the direction of rotation. When reverse operation is detected, the controller modifies parameters such as motor speed, torque limits, and ramp rates to prevent fastener stripping. This dynamic adaptation allows the system to maintain reliability without requiring overly complex manual intervention.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses sensors to detect the direction of motor rotation and provides feedback to the controller. Based on this feedback, the controller automatically selects appropriate operating parameters for forward or reverse operation, preventing fastener stripping while maintaining relatively simple overall system architecture.

Inventive Principle:

Principle #23Feedback

3Object-affected harmful factors

If the power tool automatically detects fastener stripping, then user safety is improved, but the sensor system becomes more complex

Engineering Contradiction:

Improveuser safetyVSAvoidsensor system complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The system uses sensors to detect the direction of motor rotation and provides feedback to the controller. Based on this feedback, the controller automatically selects appropriate operating parameters for forward or reverse operation, preventing fastener stripping while maintaining relatively simple overall system architecture.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system replaces complex mechanical sensing mechanisms with electronic sensors and digital signal processing. This substitution allows for reliable fastener stripping detection through software algorithms that analyze motor current, torque, and rotation patterns, maintaining simplicity while improving safety.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enhances the efficiency of sheet metal fastener operations by preventing stripping and optimizing forward and reverse operations, providing user alerts for improved user experience and tool performance.

Implementation Method 1

The sensor may include at least one selected from a group consisting of a motor current sensor, a Hall effect sensor, a torque sensor, and a position sensor.

Methodology Applied

Scientific EffectHall effect: Hall Effect

Implementation Method 2

The sensor may include at least one selected from a group consisting of a motor current sensor, a Hall effect sensor, a torque sensor, and a position sensor.

Methodology Applied

Scientific EffectTorque: Torque

Data Source

PatentUS12623318B2Power tool with sheet metal fastener mode

Publication Date: 2026.05.12 MILWAUKEE ELECTRIC TOOL CORP

AI summary

A power tool includes a housing, a motor supported within the housing, the motor including a rotor, a drive assembly operably coupled to the rotor, the drive assembly including an output configured to rotate about an axis in a first direction in response to forward operation of the motor and in a second, opposite direction in response to reverse operation of the motor, a sensor, a controller in communication with the sensor and the motor, the controller configured to control a forward operation of the motor according to a first set of parameters, during the forward operation of the motor, receive feedback from the sensor and estimate a number of rotations of the output based on the feedback from the sensor, and after the forward operation of the motor, control a reverse operation of the motor according to a second set of parameters different from the first set of parameters.