Keyed Pipe Coupling to Prevent Rotational Unthreading

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional pipe connections in drop pipe assemblies are prone to unthreading due to rotational torque, and existing solutions like retaining clips or adhesives have drawbacks such as potential loss or permanent connections, respectively.

Innovation Solution

A keyed coupling member with internal key features engages corresponding keyed ends of adjacent pipe lengths, preventing rotational disengagement and allowing for fluid-tight connections using a combination of key members and alternative connection features.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If threaded joints are used to connect adjacent pipes, then the connection allows for assembly and disassembly, but the joint becomes unthreaded when rotational torque is applied

Engineering Contradiction:

Improveassembly and disassembly capabilityVSAvoidresistance to unthreading under rotational torque

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

A coupling member is introduced as an intermediary component between adjacent pipe lengths. This coupling member includes a keyed end that engages with keyed grooves on the pipe ends, preventing rotational disengagement while allowing the threaded connection to be assembled and disassembled when needed.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The coupling member features an asymmetric keyed design where the key protrusion on the coupling member fits into a corresponding keyed groove on the pipe end. This asymmetric geometry prevents rotation in one direction while maintaining the ability to assemble and disassemble the connection.

Inventive Principle:

Principle #4Asymmetry

2Reliability

If retaining clips or pins are used to secure the threaded joint, then unthreading is prevented, but the clips or pins can fall out and become obstacles

Engineering Contradiction:

Improveprevention of unthreadingVSAvoidloose clips or pins becoming obstacles

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The retaining function is extracted from separate clips or pins and integrated directly into the coupling member structure. The keyed end of the coupling member is an integral part of the coupling body, eliminating the risk of separate retaining elements becoming loose and creating obstacles.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The retaining function is merged with the coupling member structure itself. The keyed end and the coupling body form a single integrated component, combining the connection and retention functions into one unified element that cannot separate or become loose.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If adhesives are used at joint locations to prevent pipe separation, then pipe separation is prevented, but the connection becomes permanent and cannot be separated

Engineering Contradiction:

Improveprevention of pipe separationVSAvoidability to separate for lifting or removal

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The coupling member provides a dynamic connection that transitions from a loose threaded state to a locked state during assembly. The keyed end engages with the keyed groove to prevent rotation during operation, but the entire coupling can be disassembled by unscrewing the threaded portion, allowing for lifting or removal when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The connection is segmented into two functional parts: the threaded portion that allows assembly/disassembly and the keyed portion that prevents rotation during operation. This segmentation enables the connection to provide both security during use and separability when needed.

Inventive Principle:

Principle #1Segmentation

4Reliability

If a keyed coupling member is used to prevent rotation, then rotational disengagement is prevented, but the device complexity increases

Engineering Contradiction:

Improveprevention of rotational disengagementVSAvoidstructure of coupling member with key features

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The coupling member is designed to perform multiple functions: the threaded portion provides assembly and disassembly capability, the keyed end prevents rotation, and the coupling body provides structural support. This multi-functionality reduces the need for separate components, actually simplifying the overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12486928B2Anti-rotational pipe coupling

Publication Date: 2025.12.02 JOHNSON SCREENS INC

AI summary

Apparatus and related method for coupling adjacent pipe lengths, for example, a drop pipe assembly that utilize an intermediate coupling member to prevent rotational disengagement of adjacent pipe lengths under the influence of rotational torque. The coupling member can comprise an internal key feature that physically engages a keyed end on at least one end of a length of pipe. The internal key feature can include key members located on each coupling end of the coupling member such that the key members engage corresponding keyed ends of adjacent lengths of pipe such that the coupling member prevents rotation of the adjacent pipe length relative to each other.