Quick-Fit Connection Assembly With Anti-Rotation Washer Lock

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Solution Overview

Problem

Existing hydraulic connection assemblies struggle with installation accuracy on curved walls and high-pressure applications, often requiring soft seals and manual tightening, which is difficult to verify and prone to accidental breakage, and they lack effective anti-rotation mechanisms.

Innovation Solution

A connection assembly featuring a tubular connecting element with sliding portions and a washer with a nosepiece that engages with the connecting element, preventing rotation and allowing secure installation on flat or curved walls, even under high pressure, without the need for key sockets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the external thread extension is increased to allow manual tightening, then the rigidity of the connecting element decreases, but the ability to avoid accidental breakage improves

Engineering Contradiction:

Improverigidity of connecting elementVSAvoidmanual tightening capability

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The connecting element is divided into distinct functional zones: a threaded region for engagement, a central rigid body for structural strength, and an extended region for manual operation. This segmentation allows each portion to be optimized independently - the central body maintains rigidity while the extended region provides leverage for tightening

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The solution transitions from a one-dimensional thread extension problem to a three-dimensional structural solution by adding radial thickness and longitudinal extension to create a multi-zone connecting element that simultaneously achieves rigidity and operability

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of operation

If friction between seals and external wall is exploited for tightening, then installation is simplified, but the system is limited to flat walls and soft cup packings for low pressure applications

Engineering Contradiction:

Improveinstallation simplicityVSAvoidapplicability to curved walls and high pressure

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The solution replaces the friction-based sealing mechanism with a mechanical interlocking system using a profiled washer and corresponding profile on the connecting element. This mechanical engagement provides positive positioning and anti-rotation capability independent of wall flatness or seal hardness

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the fundamental mechanism from friction-dependent (soft seals on flat walls) to geometry-dependent (profiled mechanical engagement). This parameter change enables the system to function on curved walls and with harder seals suitable for high-pressure applications

Inventive Principle:

Principle #35Parameter changes

3Strength

If the external threaded portion is reduced to increase rigidity, then accidental breakage is avoided, but manual tightening and screwing means cannot be used

Engineering Contradiction:

Improverigidity of connecting elementVSAvoidmanual tightening capability

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

4Reliability

If seals with higher hardness are used for high pressure applications, then sealing performance improves, but the tightening torques necessary to deform the seal increase considerably

Engineering Contradiction:

Improvesealing performance at high pressureVSAvoidtightening torque

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4176194B1Quick-fit connection assembly

Publication Date: 2025.08.20 TROMBATORE GIUSEPPE

Figure 1~3A
Figure 4~6
Figure 7~8

AI summary

The present invention relates to a quick-fit connection assembly not affected by accidental rotations during the installation due to the presence of an innovative connecting element (1) which has, in the threaded external region, one or more sliding tracks (3) suitable for engaging with the nosepiece (91 ) of a corresponding washer (9).