Convertible Filter End Cap Assembly for Lower Inventory

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Solution Overview

Problem

Existing filter assemblies require separate inventory for filter elements with tapered and flat end caps, leading to inefficiencies in management and maintenance, particularly in hygienic environments like the processed food and beverage industry.

Innovation Solution

A filter element with an end cap arrangement that is selectively convertible from a tapered end cap to a flat end cap, utilizing a coupling mechanism such as a threaded connection or snap-fit, allowing for easy conversion and sealing between the two types.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate inventory is maintained for filter elements with tapered and flat end caps, then the correct configuration is available for specific uses, but inventory management complexity and costs increase

Engineering Contradiction:
Improveavailability of correct filter configurationVSAvoidinventory management complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The filter element is designed with a universal end cap arrangement that can be converted between tapered and flat configurations. The housing includes both a tapered portion and a flat portion, allowing the same filter element to function with either end cap type by simply rotating or repositioning the end cap, thereby eliminating the need for separate inventory of tapered and flat filter elements.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The end cap arrangement is made dynamically convertible between two states (tapered and flat configurations). The end cap can be rotated or repositioned within the housing to change its orientation, transforming the filter element from a static single-configuration component to a dynamic multi-configuration component that adapts to different mounting requirements.

Inventive Principle:
Principle #15Dynamics

2Adaptability or versatility

If a convertible end cap arrangement is implemented, then inventory needs are reduced and versatility is improved, but the structural complexity of the end cap increases

Engineering Contradiction:
Improveend cap configuration flexibilityVSAvoidend cap structural complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The end cap arrangement is segmented into distinct functional portions within the housing: a tapered portion for tapered end cap engagement and a flat portion for flat end cap engagement. This segmentation allows each portion to be optimized for its specific function while collectively providing versatile convertible functionality through the unified housing structure.

Inventive Principle:
Principle #1Segmentation

3Adaptability or versatility

If end caps are made convertible between tapered and flat configurations, then single filter elements can serve multiple uses, but the sealing and connection reliability may be compromised

Engineering Contradiction:
Improveend cap configuration convertibilityVSAvoidsealing and connection reliability
Core Design Contradiction:
Adaptability or versatilityVSReliability

Solution Approach 1:

Different portions of the housing are designed with locally optimized geometries: the tapered portion is specifically shaped for tapered end cap sealing and alignment, while the flat portion is designed for flat end cap engagement. Each local region maintains its specialized quality to ensure reliable sealing and connection for the corresponding end cap type, while the overall structure enables convertibility between configurations.

Inventive Principle:
Principle #3Local quality

Data Source

PatentEP4389252B1Filter element with convertible end cap and methods
Publication Date: 2025.09.03 DONALDSON CO INC
  • EP4389252B1 patent drawingFigure 1
  • EP4389252B1 patent drawingFigure 2~4
  • EP4389252B1 patent drawingFigure 5~6

AI summary

A filter element has an end cap arrangement selectively convertible from a tapered end cap to a flat end cap, and from the flat end cap to the tapered end cap. The conversion can include coupling, such as a threaded engagement; or, it can include a snap-fit engagement.