Vibration-Isolated Grinder Handle Sleeve With Thermal Gap

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Solution Overview

Problem

Handheld power tools used for grinding, particularly in high-power applications, cause significant vibrations that negatively impact operator ergonomics, as existing vibration-absorbing materials and designs are insufficient to mitigate these vibrations effectively.

Innovation Solution

A handheld power tool design featuring a front handle portion with an outer tubular gripping sleeve circumferentially supported by at least two vibration-absorbing resilient elements around an inner tubular structure, creating a circumferential gap to absorb vibrations and prevent heat transfer, while allowing for axial, circumferential, and radial movement to enhance ergonomic handling and tool robustness.

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 and ergonomics worsen

Engineering Contradiction:

Improvegrinding effectivenessVSAvoidvibrations

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The handle is divided into inner and outer tubular structures with resilient elements between them, creating segmented vibration isolation zones that allow the high-power motor to operate effectively while preventing vibration transmission to the user's hand

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Vibration-absorbing resilient elements are introduced as intermediary components between the inner tubular structure (connected to the motor) and the outer tubular gripping sleeve, acting as a mediator that absorbs vibrations generated by the high-power motor before they reach the user's hand

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 the motor increases

Engineering Contradiction:

ImprovevibrationsVSAvoidheat transfer

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The patent introduces a circumferential gap dimension between the inner and outer tubular structures, creating a three-dimensional vibration-absorbing resilient element arrangement that provides both vibration isolation and thermal insulation pathways, preventing heat transfer while absorbing vibrations

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The vibration-absorbing resilient elements serve as a thermal intermediary, creating thermal resistance between the inner tubular structure (hot) and the outer tubular gripping sleeve (cool), thereby reducing heat transfer to the user's hand while maintaining vibration absorption

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If the handle structure is made more complex with multiple components, then vibration absorption is improved, but device complexity increases

Engineering Contradiction:

ImprovevibrationsVSAvoidhandle structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The handle employs a nested structure where the inner tubular structure is placed inside the outer tubular gripping sleeve, with vibration-absorbing resilient elements positioned in the circumferential gap between them. This nested arrangement achieves effective vibration isolation while maintaining a compact and relatively simple overall design

Inventive Principle:

Principle #7Nested doll (Nesting)

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 reduces vibrations and heat transfer, improving operator ergonomics and tool durability, with the vibration-absorbing elements providing effective damping and a solid grip, even at high RPMs, thus enhancing user comfort and tool performance.

Implementation Method 1

at least two vibration absorbing resilient elements arranged around the inner tubular structure, such that a circumferential gap is formed between the inner tubular structure and the gripping sleeve

Methodology Applied

Scientific EffectVibration absorption: Damping

Implementation Method 2

the at least two vibration absorbing resilient elements are made of polyurethane

Methodology Applied

Scientific EffectResilient material damping: Viscoelasticity

Implementation Method 3

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

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS12115616B2Hand held power tool

Publication Date: 2024.10.15 ATLAS COPCO IND TECHNIQUE AB INTELLECTUAL PROPERTY DEPARTMENT

AI summary

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