Axially Elongated Projections for Cleaning Sponge Roller Core

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Solution Overview

Problem

Conventional central cores for cleaning sponge rollers cause non-uniformity in cleaning due to the sponge roller twisting and shifting over time, leading to inconsistent cleaning results.

Innovation Solution

A cylindrical central core with axially elongated projections on its outer surface, featuring concave and convex portions that securely hold the sponge roller in place, preventing rotation and axial movement, ensuring uniform contact and cleaning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional smooth central core is used, then the structure is simple and easy to manufacture, but the sponge roller twists and shifts during operation causing non-uniform cleaning

Engineering Contradiction:

Improvecleaning uniformityVSAvoidcore structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The central core features localized axially elongated projections with concave and convex portions on its outer surface, while the rest of the core maintains a simple cylindrical structure. This local quality modification provides the necessary gripping function without significantly increasing overall structural complexity

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The outer surface of the central core is segmented into multiple axially elongated projections distributed around the circumference. Each projection acts as an independent gripping element that contacts the sponge roller, distributing the holding force uniformly and preventing twisting and shifting during rotation

Inventive Principle:

Principle #1Segmentation

2Reliability

If the sponge roller is held firmly to prevent twisting, then cleaning uniformity improves, but the sponge roller may become difficult to replace

Engineering Contradiction:

Improvecleaning uniformityVSAvoidsponge roller replacement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The gripping function is localized to specific axially elongated projections on the central core, while the rest of the interface between the core and sponge roller remains smooth and simple. This allows firm holding during operation while maintaining ease of assembly and disassembly

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of using a complex locking mechanism or interference fit that would make replacement difficult, the invention uses simple axial projections that provide holding force only in the radial direction during rotation. The sponge roller can be easily installed and removed by axial movement, inverting the typical approach where secure mounting mechanisms complicate assembly

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS8505145B2Central core for a cleaning sponge roller

Publication Date: 2013.08.13 AION CO LTD

AI summary

An approximately cylindrical central core for cleaning sponge roller having an axially extending internal hole and multiple small holes realizing communication from the internal hole to the circumferential external surface. The central core for cleaning sponge roller is characterized in that the external surface of the central core is provided in the circumferential direction with multiple axially slender projections and that the projections each has an axial section viewed from a direction perpendicular to the axial direction that is not flat.