Magnetic Holding Device for Concrete Formwork Anchors

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Solution Overview

Problem

Existing magnetic holding devices for transport anchors in concrete formworks are prone to wear and damage due to screw connections, which are time-consuming and often incorrectly loosened, leading to increased manufacturing costs and risks of flowable concrete penetrating into threaded sleeves during concreting.

Innovation Solution

A double or multi-sided permanent magnetic holding device with a base featuring a magnetic adhesive force on both sides, replacing screw connections with a plug connection held by magnetic forces, ensuring a secure and uniform fit, and allowing for easy detachment and reuse by leveraging equal magnetic forces on both sides.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If screw connections are used to attach transport anchors to magnetic holding devices, then the connection strength is improved, but the assembly time increases and the risk of wear and damage increases

Engineering Contradiction:

Improveconnection strengthVSAvoidassembly time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The patent replaces the mechanical screw connection system with a magnetic field-based holding system. The permanent magnet generates a magnetic field that directly attracts the magnetizable transport anchor, eliminating the need for threaded mandrels or bolts. This substitution reduces assembly time while maintaining connection strength through magnetic attraction force.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts the threading function from the holding device by using a magnetizable projection on the transport anchor that is attracted by the permanent magnet. The threaded connection is completely removed, leaving only the essential holding function achieved through magnetic attraction, thereby simplifying the assembly process.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If threaded mandrels are used for connecting transport anchors, then the connection reliability is improved, but the risk of breakage due to improper loosening increases

Engineering Contradiction:

Improveconnection reliabilityVSAvoidrisk of breakage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical threaded connection system with a magnetic field-based holding system. The permanent magnet generates a magnetic field that directly attracts the magnetizable transport anchor, eliminating the need for threaded mandrels or bolts. This substitution reduces assembly time while maintaining connection strength through magnetic attraction force.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs a magnetizable projection on the transport anchor that is specifically designed to be attracted by the permanent magnet. This projection serves as a disposable or single-use component that ensures reliable connection during the concrete pouring process without the risk of breakage associated with reusable threaded mandrels.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If push-fit connections are used during concreting, then the assembly speed is improved, but the risk of concrete penetration into threaded sleeves increases

Engineering Contradiction:

Improveassembly speedVSAvoidconcrete penetration risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical push-fit connection system with a magnetic field-based holding system. The permanent magnet generates a magnetic field that directly attracts the magnetizable transport anchor, eliminating the need for threaded mandrels or bolts. This substitution reduces assembly time while maintaining connection strength through magnetic attraction force.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Ease of manufacture

If one-sided magnetic holding devices are used, then the manufacturing cost is reduced, but the ease of operation for detachment is worsened

Engineering Contradiction:

Improvemanufacturing costVSAvoiddetachment ease

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The patent divides the magnetic holding function into two separate sides: one side with a permanent magnet for attaching to the formwork wall, and another side with a magnetizable projection for attracting the transport anchor. This segmentation allows each side to be optimized for its specific function while maintaining overall simplicity and cost-effectiveness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a magnetizable holding device that attracts a magnetic transport anchor, the patent inverts the approach by using a permanent magnet on the holding device that attracts a magnetizable projection on the transport anchor. This inversion simplifies the holding device construction while maintaining effective magnetic attraction.

Inventive Principle:

Principle #13The other way round (Inversion)

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

This solution simplifies and accelerates the assembly and disassembly of transport anchors, reduces manufacturing costs, and prevents concrete penetration into the holding device, enhancing the reliability and efficiency of the magnetic holding mechanism.

Implementation Method 1

a base which is wholly or partially covered with permanent magnetic material to generate a magnetic holding force

Methodology Applied

Scientific EffectMagnetic holding force: Magnetism

Implementation Method 2

to generate a magnetic holding force with the formwork wall by magnetizing the formwork wall

Methodology Applied

Scientific EffectMagnetizing: Magnetism

Data Source

PatentEP4006266B1Holding devices for transport anchors and transport anchors

Publication Date: 2024.09.04 WEIDNER GEORG

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AI summary

The invention relates to a double- or multi-sided permanent magnetic holding device (210, 220) for temporarily and/or releasably holding a magnetizable transport anchor (110, 120, 130) on a magnetizable formwork wall (300) of a formwork for producing a concrete part (301). The holding device has a base (211, 221) which is wholly or partially formed with permanent magnetic material to generate a magnetic holding force, wherein the base (211, 221) has a first side (211a, 221a) for forming a magnetic holding force with the formwork wall (300) and a second side (211b, 221b) facing away from or not associated with the formwork wall (300) for forming a magnetic holding force with the transport anchor (110, 120, 130).The second side (211b, 221b) of the base (211, 221) or the base (211, 221) has a projection (213, 223) or a recess, wherein the projection (213, 223) or the recess can be coupled to a recess (113, 123) or a projection of the transport anchor (110, 120, 130) to form a plug connection held together by a magnetic holding force.