Magnetic Alignment in Hand-Held Tool-Change Magazine

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Solution Overview

Problem

Hand-guided screwdrivers with rotational tool receivers face challenges in achieving tilt-free and resistance-free insertion of screwdriver bits, leading to rotational play and reduced torque transfer, which affects the perceived quality and efficiency of the tool.

Innovation Solution

A hand-held machine tool with a tool receiver featuring an internal profile and a positioning device that includes a magnet for aligning the external profile of the insert tool, creating a form-locking connection free of rotational play, allowing for reliable and resistance-free insertion and improved torque transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a rotational tool receiver is used to receive insert tools from a tool magazine, then the tool receiver can accommodate multiple different insert tools, but the insertion process may experience tilt and resistance leading to rotational play

Engineering Contradiction:

Improvetool receiver accommodation capabilityVSAvoidinsertion accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent replaces mechanical alignment mechanisms (such as spring elements or cam-based rotational entrainers) with a magnetic positioning device. The magnet magnetically couples with the insert tool to actively guide and align it during insertion, eliminating the need for complex mechanical guidance systems while ensuring tilt-free and resistance-free insertion into the rotational tool receiver

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The magnetic positioning device acts as an intermediary between the tool magazine and the rotational tool receiver. It provides a magnetic field-based interaction that facilitates smooth transition and alignment of the insert tool, mediating the connection between the storage magazine and the active tool holder without direct mechanical contact or friction

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If mechanical components like spring elements are used for alignment, then the insert tool can be positioned, but the device complexity increases

Engineering Contradiction:

Improvealignment capabilityVSAvoidmechanical components quantity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent substitutes complex mechanical alignment components (spring elements, cam mechanisms, rotational entrainers with multiple longitudinal ribs) with a simple magnetic positioning device. The magnet provides alignment functionality through magnetic coupling with the insert tool, eliminating the need for numerous mechanical parts while maintaining ease of operation and tilt-free insertion

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If the form-locking connection has rotational play, then the insert tool can be easily inserted, but the maximum torque transferable is reduced

Engineering Contradiction:

Improveinsertion easeVSAvoidtorque transfer capability

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The magnetic positioning device performs preliminary alignment of the insert tool before it engages with the tool receiver. By pre-positioning the tool in the correct orientation and ensuring it is tilted-free during insertion, the system achieves both easy insertion and a form-locking connection with minimal rotational play, thereby maximizing torque transfer capability

Inventive Principle:

Principle #10Preliminary action

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

Ensures unfailingly tilt-free and resistance-free insertion of screwdriver bits, preventing rotational play, enhancing the perceived quality and increasing the maximum torque transferable, while maintaining alignment without mechanical components like springs, and allowing for intuitive tool-changing.

Implementation Method 1

The positioning device has at least one magnet which is provided to align the insert tool relative to the internal profile upon insertion of the insert tool into the internal receiver

Methodology Applied

Scientific EffectMagnetic alignment: Magnetism

Implementation Method 2

at least one radially inwardly directed magnetic surface of the at least one magnet and at least one polygon surface of the external polygon lie side by side in parallel

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentUS10759038B2Hand-held machine tool having a tool-change magazine

Publication Date: 2020.09.01 ROBERT BOSCH GMBH

AI summary

A hand-held machine tool having a tool receiver to receive an insert tool having an external profile, the tool receiver featuring an internal receiver provided at least sectionally with an internal profile, and having a tool housing assigned a tool-change magazine having at least one tool chamber for storing the insert tool, the tool chamber being alignable with the tool receiver to allow the insert tool to be transferred from the tool chamber into the internal receiver or from the internal receiver into the tool chamber, a positioning device being provided for the circumferential alignment of the external profile when transferring the insert tool from the tool chamber into the internal receiver of the tool receiver to produce a form-locking connection between the internal profile and the external profile that at least for the most part, is free of rotational play, the positioning device has at least one magnet.