Impact Tool Vibration Isolators for Handle Noise Reduction

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Solution Overview

Problem

Impact tools experience significant vibration and noise due to repeated impacts between the hammer and anvil, which are transmitted to the operator's hand and require additional hearing protection.

Innovation Solution

Incorporation of vibration isolators, such as O-rings, washers, and wave springs, strategically positioned throughout the impact tool to reduce vibration transmission and noise, using materials like metal and viscoelastic substances to dampen or deaden vibrations and sounds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If vibration isolators are added to reduce vibration transmission, then operator comfort and safety are improved, but device complexity increases

Engineering Contradiction:

Improvevibration transmission to operatorVSAvoidtool structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Vibration isolators are pre-installed at strategic locations within the tool housing to cushion and dampen vibrations before they propagate to the handle and operator's hand. The isolators are positioned between vibration-generating components (hammer, anvil, motor) and the handle structure to intercept and reduce vibration transmission paths.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

Vibration isolators serve as intermediary elements inserted between the vibration-generating impact mechanism and the handle structure. These isolators act as mediators that decouple the vibration paths, allowing the tool to maintain its impact function while reducing the transmission of harmful vibrations to the operator.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If vibration isolators are added to reduce noise, then operator hearing safety is improved, but device complexity increases

Engineering Contradiction:

Improvenoise levelVSAvoidtool structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Vibration isolators are pre-installed within the tool housing to cushion and dampen vibrations at their source and along transmission paths. By reducing vibration amplitude through the isolators, the noise generated by the impact mechanism is simultaneously reduced before it reaches the operator, providing dual protection against vibration and noise exposure.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Object-affected harmful factors

If multiple vibration isolators are positioned throughout the tool, then vibration reduction effectiveness is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvevibration transmissionVSAvoidassembly complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The vibration isolation system is segmented into multiple discrete isolators positioned at specific locations within the tool housing. Each isolator addresses vibration from particular components (hammer, anvil, motor), allowing for targeted vibration control. This segmentation enables modular assembly where isolators can be independently installed at key vibration transmission points.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Vibration isolators are extracted as separate, standalone components rather than being integrated into the housing structure itself. This allows the isolators to be independently selected, positioned, and installed at optimal locations for vibration reduction, simplifying both the design and assembly process while maintaining effectiveness.

Inventive Principle:

Principle #2Taking out (Extraction)

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

Effectively reduces operator-hand vibrations and noise levels, enhancing user comfort and safety in industrial settings.

Implementation Method 1

Isolators are also described for reducing vibration that is transmitted through the tool housing to the handle which are absorbed by the operator

Methodology Applied

Scientific EffectVibration isolation: Damping

Implementation Method 2

The isolators may also reduce noise created by the impact tool

Methodology Applied

Scientific EffectVibration damping: Damping

Implementation Method 3

using materials like metal and viscoelastic substances to dampen or deaden vibrations and sounds

Methodology Applied

Scientific EffectViscoelastic damping: Viscoelasticity

Implementation Method 4

Incorporation of vibration isolators, such as O-rings, washers, and wave springs

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS12447599B2Impact tool with vibration isolation

Publication Date: 2025.10.21 INGERSOLL RAND IND US INC

AI summary

An impact tool is provided with vibration isolators to reduce vibrations felt by the operator gripping the handle of the tool. The impact tool has a hammer and an anvil that impact against each other during use. The impacts create undesirable vibrations in the tool housing and noise in the work area. The isolators are useful in minimizing such vibrations and noise.