Magnetic Functional Unit Attachment for Power Tools

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing hand-guided power tools, such as polishers and sanders, face difficulties in quickly and easily attaching and detaching functional units from the tool shaft due to complex threaded connections requiring separate tools and temporary fixing mechanisms.

Innovation Solution

The use of magnetic forces to attach and detach functional units from the tool shaft, allowing for easy and fast exchange without the need for separate tools, with a torque-proof attachment mechanism ensuring secure operation during use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a threaded connection is used to attach the functional unit to the tool shaft, then the attachment is secure and torque-proof, but the attachment and detachment process becomes complicated and time-consuming requiring separate tools and temporary fixing mechanisms

Engineering Contradiction:

Improvesecure attachmentVSAvoidattachment and detachment process

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the traditional mechanical threaded connection system with a magnetic field-based attachment system. The magnetic field acts between the tool shaft and functional unit to provide secure attachment without requiring threads, wrenches, or blocking mechanisms, thereby simplifying the attachment and detachment process while maintaining reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If a threaded connection is used to attach the functional unit to the tool shaft, then the attachment is secure, but the process requires separate tools and temporary fixing mechanisms increasing device complexity

Engineering Contradiction:

Improvesecure attachmentVSAvoidattachment mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the complex mechanical threaded connection system with a magnetic field-based attachment system. This eliminates the need for separate tools, blocking mechanisms, and temporary fixing devices, thereby reducing overall device complexity while maintaining secure attachment through magnetic forces

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary between the tool shaft and functional unit. This magnetic field acts as a mediator to provide secure attachment without requiring direct mechanical engagement through threads, simplifying the attachment mechanism and eliminating the need for additional tools and fixing mechanisms

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a threaded connection is used to attach the functional unit to the tool shaft, then the attachment is secure, but the attachment and detachment process takes more time reducing productivity

Engineering Contradiction:

Improvesecure attachmentVSAvoidfunctional unit exchange speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent replaces the time-consuming threaded connection system with a magnetic field-based attachment system. The magnetic force allows for rapid attachment by simply bringing the functional unit near the tool shaft and quick detachment by overcoming the magnetic force, significantly reducing the time required for functional unit exchange while maintaining secure attachment during operation

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 rapid and secure attachment and detachment of functional units, simplifying the process and reducing operational time, while maintaining torque transmission and precise guiding of the functional unit relative to the tool shaft.

Implementation Method 1

the first attachment member is adapted to releasably attach the base element of the functional unit to the tool shaft of the power tool by means of magnetic force

Methodology Applied

Scientific EffectMagnetic force: Magnetism

Data Source

PatentEP3854523A1Functional unit for a hand-guided power tool and power tool with such a functional unit

Publication Date: 2021.07.28 VALENTINI GUIDO (I) (IT)

Figure 1
Figure 2
Figure 3~4

AI summary

The invention refers to a functional unit (27) for a hand-guided power tool (1), in particular in the form of a polisher or a sander. The functional unit (27) comprises a base element (28), a first attachment member (29) for releasable attachment of the base element (28) to a motor driven tool shaft (23) of the power tool (1), a working element (11) adapted for working a surface of a workpiece during use of the power tool (1), and a second attachment member (30) for attachment of the working element (11) to the base element (28). In order to provide for a fast and easy replacement of a functional unit (27) against another functional unit (27) it is suggested that the first attachment member (29) is adapted to releasably attach the base element (28) of the functional unit (27) to the tool shaft (23) of the power tool (1) by means of magnetic force.