Power Tool Brake Abort for Faster Driver Blade Retraction

Solution Overview

Problem

Existing power tools face challenges in balancing the need for increased operating cycle rate with reduced wear and tear, as braking sequences slow down the electric motor and increase current draw, affecting battery life.

Innovation Solution

An electronic control system that initiates a retraction cycle, determines the position of the driver blade, and selectively aborts the braking cycle based on trigger and safety switch activations, optimizing operating cycle rate and reducing current draw.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a braking sequence is initiated at the electric motor during the retraction cycle, then wear and tear is reduced, but the operating cycle rate decreases and current draw increases

Engineering Contradiction:

Improvewear reductionVSAvoidoperating cycle rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The braking sequence is made dynamic and conditional rather than static and fixed. The electronic controller dynamically adjusts whether to initiate braking based on real-time detection of trigger and safety switch activations, allowing the system to adapt between wear reduction and cycle rate optimization depending on operational context

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters of the braking sequence by selectively aborting it based on switch activation states. When triggers are activated, the braking sequence is aborted, changing the motor's operational state from braking to continuous operation, thereby optimizing cycle rate while maintaining wear reduction benefits during normal operation

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a braking sequence is initiated at the electric motor during the retraction cycle, then wear and tear is reduced, but current draw increases affecting battery life

Engineering Contradiction:

Improvewear reductionVSAvoidcurrent draw

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The braking sequence is made dynamic and conditional rather than static and fixed. The electronic controller dynamically adjusts whether to initiate braking based on real-time detection of trigger and safety switch activations, allowing the system to adapt between wear reduction and energy consumption depending on operational context

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters of the braking sequence by selectively aborting it based on switch activation states. When triggers are activated, the braking sequence is aborted, changing the motor's operational state from braking to continuous operation, thereby reducing current draw and extending battery life while maintaining wear reduction benefits during normal operation

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the electronic controller aborts the braking cycle in response to trigger and safety switch activations, then operating cycle rate increases and current draw decreases, but wear reduction is compromised

Engineering Contradiction:

Improveoperating cycle rateVSAvoidwear reduction

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system changes the operational parameters of the braking sequence by selectively aborting it based on switch activation states. When triggers are activated, the braking sequence is aborted, changing the motor's operational state from braking to continuous operation, thereby optimizing cycle rate while maintaining wear reduction benefits during normal operation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The braking sequence is made dynamic and conditional rather than static and fixed. The electronic controller dynamically adjusts whether to initiate braking based on real-time detection of trigger and safety switch activations, allowing the system to adapt between wear reduction and cycle rate optimization depending on operational context

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12539592B2Power tool brake abort

Publication Date: 2026.02.03 MILWAUKEE ELECTRIC TOOL CORP

AI summary

Power tools described herein include an electric motor, a driver blade, a trigger switch, a safety switch, and an electronic controller. The electronic controller is connected to the electric motor, the trigger switch, and the safety switch. The electronic controller is configured to initiate a retraction cycle by controlling the electric motor to move the driver blade from a first position to a second position, determine a position of the driver blade during the retraction cycle, initiate, in response to the position of the driver blade exceeding a first threshold, a braking cycle at the electric motor, and abort, in response to detecting a first activation of the trigger switch and a second activation of the safety switch, the braking cycle.