Impact Tool Hammer-Anvil Sensing For Specified Torque Tightening

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Solution Overview

Problem

Existing impact tools, particularly T-handle type impact wrenches, are limited in their ability to tighten fasteners to a specified range of torques, and no consideration has been given to other types of impact tools for this functionality.

Innovation Solution

An impact tool configuration that includes a housing, a motor, a hammer, an anvil, sensors, and a controller to detect and control tightening torque, allowing for precise torque application in various types of impact tools.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional impact tools are used, then fastening operations can be performed, but tightening torque cannot be controlled within a specified range

Engineering Contradiction:

Improvetightening torque precisionVSAvoidtool structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The impact tool integrates multiple functions by combining the impact mechanism with torque control capability, sensor detection, and electronic control systems. This allows the tool to both deliver impact forces for fastening operations and precisely control tightening torque within specified ranges, eliminating the need for separate torque control devices

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The tool incorporates sensors that detect operational parameters and provide feedback to the control unit. This feedback mechanism enables the control unit to monitor and adjust the impact frequency and torque in real-time, ensuring precise control within the specified torque range while maintaining the impact tool's core functionality

Inventive Principle:

Principle #23Feedback

2Measurement precision

If torque control is added to impact tools, then tightening precision is improved, but device complexity increases

Engineering Contradiction:

Improvetorque detection precisionVSAvoidsensor and control system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The tool replaces complex mechanical torque measurement mechanisms with electronic sensors and digital control systems. This substitution enables precise torque detection and control while reducing mechanical complexity, as electronic systems can provide accurate measurements with simpler physical structures compared to traditional mechanical torque indicators

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

Enables the tightening of fasteners such as bolts, nuts, and screws within a specified torque range across different types of impact tools, enhancing precision and consistency.

Implementation Method 1

a first sensor that detects rotation of the anvil

Methodology Applied

Scientific EffectRotation detection:

Implementation Method 2

a second sensor that detects movement of the hammer

Methodology Applied

Scientific EffectMovement detection:

Implementation Method 3

a controller that controls tightening torque based on the detection data of the first sensor and the second sensor

Methodology Applied

Scientific EffectTorque control:

Data Source

PatentUS20250289103A1Impact tool

Publication Date: 2025.09.18 MAKITA CORP

AI summary

An impact tool includes a housing, a motor housed in the housing, a hammer rotated by the motor, an anvil impacted in the direction of rotation by the hammer, a hammer case housing the hammer, a first sensor that detects rotation of the anvil, a second sensor that detects movement of the hammer, and a controller that controls tightening torque based on detection data output by the first and second sensors. The anvil has a bit hole into which a tool accessory is insertable.