Press Tool Jaw Hinge Overlap for Large Pipe Diameter

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Solution Overview

Problem

Existing pressing tools are limited in producing press connections for pipes with nominal diameters larger than 54 mm, as they cannot accommodate the increased diameter and require more complex and costly designs to compensate for reduced pressing forces, leading to increased manufacturing costs and time-consuming operations.

Innovation Solution

The pressing tool design incorporates depressions and projections on the outer surfaces of the rear ends of the pressing jaw halves, allowing for a larger opening angle without altering the course of the inlet contours, enabling the use of conventional pressing contours and maintaining structural simplicity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the leg length of the press jaw halves is lengthened to accommodate larger nominal diameters, then the opening angle is increased, but the pressing forces decrease significantly

Engineering Contradiction:

Improveopening angleVSAvoidpressing forces

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The invention introduces a new spatial dimension by allowing the rear ends of the press jaw halves to engage beyond the touching point of the inlet contours. The depressions and projections create an overlapping region that extends the opening angle capability without compromising the pressing force transmission path

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The inlet contour region is segmented into distinct functional zones: the original touching point area for force transmission, and the new overlapping area with depressions and projections for increased opening angle. This segmentation allows both requirements to be satisfied in different spatial regions

Inventive Principle:

Principle #1Segmentation

2Force

If the electrohydraulic drive is designed larger to compensate for reduced pressing forces, then the pressing forces are sufficient, but the manufacturing costs increase

Engineering Contradiction:

Improvepressing forcesVSAvoidmanufacturing costs

Core Design Contradiction:

ForceVSEase of manufacture

Solution Approach 1:

The geometric modification of the press jaw halves themselves (adding depressions and projections) creates a self-reinforcing structure that maintains pressing forces without requiring external compensation. The structure serves its own force transmission function more effectively, eliminating the need for oversized drives

Inventive Principle:

Principle #25Self-service

3Ease of operation

If a pressing tool with chain links is used for large nominal diameters, then the opening angle is sufficient, but the device complexity and manufacturing costs increase

Engineering Contradiction:

Improveopening angleVSAvoiddevice complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The modified press jaw halves with depressions and projections serve multiple functions: they maintain the original pressing force transmission capability while simultaneously providing the increased opening angle needed for large nominal diameters. This universal design eliminates the need for specialized chain link structures

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Instead of using a complex chain link structure to achieve large opening angles, the invention inverts the approach by modifying the rigid press jaw halves themselves to engage in a new configuration beyond the original inlet contour touching point, achieving the same effect with simpler components

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 design allows for the production of press connections with larger nominal widths while maintaining structural simplicity and using conventional pressing contours, enhancing the opening angle and ensuring effective force transmission, thus reducing manufacturing costs and operational complexity.

Implementation Method 1

the moving part of the pressing contour, when it is displaced in the longitudinal direction towards the front end of the pressing jaw halves, moves along the inlet contours and pushes them apart

Methodology Applied

Scientific EffectMechanical force: Mechanical Force

Implementation Method 2

the enclosed areas of the fitting, for example a bead and the parts adjacent to the bead, are then pressed together by closing the press jaw, so that the fitting and the pipe are deformed in the area of the press jaw

Methodology Applied

Scientific EffectCold forming: Cold-forming

Data Source

PatentEP1767313B1Press tool

Publication Date: 2010.01.27 VIEGA GMBH & CO KG

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AI summary

Press-tool for connecting pipes has jaws (2) whose rear ends (5) can overlap as they are opened. This allows them to be used on large diameter pipes.