Magnetic Punching Tool Assembly for Secure Mobile Stamping

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Solution Overview

Problem

Conventional stamping tools face issues with space requirements, limited material processing capability, and components falling off during operation, especially in mobile applications.

Innovation Solution

A stamping tool design utilizing magnetic means to secure the adapter, spacer, and die components, allowing for secure assembly and disassembly without components falling off, and enabling efficient material processing regardless of opening shape.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional mechanical fastening is used to connect components, then the connection is secure, but components can still fall off during positioning and guiding due to careless handling

Engineering Contradiction:
Improvecomponent retentionVSAvoidhandling safety
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces traditional mechanical fastening systems (screws, clips, or interference fits) with a magnetic field-based retention system. Magnets embedded in the cylinder and/or spacer bushing create magnetic attraction forces that hold components in place during positioning and guiding, eliminating the risk of components falling off due to careless handling while allowing easy assembly and disassembly when needed.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If magnetic means are used to hold components, then components cannot fall off during handling, but the assembly and disassembly process becomes more complex

Engineering Contradiction:
Improvecomponent retentionVSAvoidassembly structure
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent embeds magnets within existing structural components such as the cylinder or spacer bushing, nesting the magnetic retention system within the existing mechanical structure. This integration approach minimizes additional complexity while achieving reliable component retention, as the magnets become part of the existing assembly rather than adding separate retention mechanisms.

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

Ensures secure handling and efficient material processing across various shapes and sizes without component loss, facilitating easy waste removal and adaptability to existing tools.

Implementation Method 1

The spacer bushing (15) is held in a simple manner on the cylinder (11) by the first magnetic means (21)

Methodology Applied
Scientific EffectMagnetic attraction: Magnetism

Implementation Method 2

The die (17) is held on the spacer sleeve (15) by second magnetic means (23)

Methodology Applied
Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentEP4201548B1Punching tool
Publication Date: 2026.02.18 ALFRA GMBH
  • EP4201548B1 patent drawingFigure 1
  • EP4201548B1 patent drawingFigure 2

AI summary

The present invention relates to a stamping tool (1) for mobile use, comprising: - a cylinder (11), - an adapter (13a) with a fastening means (13b) attached thereto, wherein the adapter (13a) can be inserted at least partially into the cylinder (11) at its first end, - optionally a spacer sleeve (15) which has a receiving opening (151) for the adapter (13a) and a passage (153) for the fastening means (13b), - a die (17) which has a passage (173) for the fastening means (13b) and a cavity (171), and - a punch (19) which can be connected to the fastening means (13b), characterized in that optionally the spacer sleeve (15) or the die (17) is held on the cylinder (11) by first magnetic means (21).