Power Tool Front Handle Sleeve for Vibration and Heat Isolation

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Solution Overview

Problem

Handheld power tools used for grinding, particularly in high-power applications, pose ergonomic challenges due to significant vibrations, which existing vibration-damping materials and designs fail to adequately address, leading to operator discomfort and fatigue.

Innovation Solution

A hand-held power tool design featuring a front handle portion with an outer gripping sleeve circumferentially supported by at least two vibration-absorbing resilient elements around an inner tubular structure, creating a circumferential gap to reduce vibration transmission and prevent heat transfer, along with additional features like axial and radial movement allowance and a rubber-coated steel pipe for enhanced grip and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high power and high RPM are delivered by the grinder, then grinding effectiveness is improved, but vibrations increase causing ergonomic problems

Engineering Contradiction:

Improvegrinding effectivenessVSAvoidvibrations

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The handle is divided into an inner tubular structure and an outer gripping sleeve as separate components, allowing independent vibration management for each part while maintaining structural integrity for high-power transmission

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Vibration-absorbing resilient elements are introduced as intermediary components between the inner tubular structure and outer gripping sleeve, acting as mediators that decouple vibration transmission while preserving the mechanical connection needed for high-power operation

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If resilient material is added to the handle, then vibration absorption is improved, but heat transfer from motor to handle increases

Engineering Contradiction:

ImprovevibrationsVSAvoidheat transfer

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The handle structure is segmented into inner and outer parts with resilient elements positioned to selectively absorb vibrations while maintaining thermal pathways that conduct heat away from the motor through the inner tubular structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the handle have different properties: the inner tubular structure provides thermal conduction pathways, while the resilient elements provide localized vibration absorption, creating optimal thermal and vibrational management in different zones

Inventive Principle:

Principle #3Local quality

3Strength

If the outer gripping sleeve is rigidly connected to the inner tubular structure, then structural strength is improved, but vibration transmission to the operator increases

Engineering Contradiction:

Improvestructural strengthVSAvoidvibrations

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The outer gripping sleeve is connected to the inner tubular structure through flexible resilient elements that maintain structural integrity and strength while providing vibration isolation, effectively using flexible components to resolve the contradiction between rigidity and vibration absorption

Inventive Principle:

Principle #30Flexible shells and thin films

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

The design significantly improves ergonomics by reducing vibrations and heat transfer, providing a more comfortable and robust handling experience while maintaining high RPM capabilities, with the resilient elements effectively damping vibrations and extending tool longevity.

Implementation Method 1

The outer gripping sleeve is circumferentially supported by at least two vibration absorbing resilient elements arranged around the inner tubular structure

Methodology Applied

Scientific EffectVibration absorption: Damping

Implementation Method 2

at least two vibration absorbing resilient elements arranged around the inner tubular structure

Methodology Applied

Scientific EffectResilience: Elasticity

Implementation Method 3

The at least two vibration absorbing resilient elements arranged around the inner tubular structure also prevents heat transfer from the inner tubular structure to the outer gripping sleeve

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentEP3990228B1Hand held power tool

Publication Date: 2023.06.14 ATLAS COPCO IND TECHNIQUE AB INTELLECTUAL PROPERTY DEPARTMENT

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AI summary

The present specification relates to a hand held power tool (1) comprising a housing (10), the housing (10) comprising a back handle portion (20) at a back end thereof. And a front handle (40) portion at a front end thereof, wherein a motor is arranged in the back handle portion (20) and coupled to an outgoing axle (50) extending through the front handle portion (40). Wherein the front handle portion (40) comprises an inner tubular structure (60) and an outer tubular gripping sleeve (70). The outer tubular gripping sleeve (70) is circumferentially supported by at least two vibration absorbing resilient elements (81, 82) arranged around the inner tubular structure (60), such that a circumferential gap is formed between the inner tubular structure (60) and the outer tubular gripping sleeve (70).