Asymmetric Dust Filter Bag Structure for Flexible Vacuum Fit

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Solution Overview

Problem

Existing dust filter bags with symmetrical construction and internal fold seams face challenges in adapting to different vacuum cleaner models and are difficult to produce, limiting their versatility and geometry flexibility.

Innovation Solution

The dust filter bag design features a fold-in mechanism where one layer's fold member is larger, allowing it to be welded to the second layer's edge, eliminating internal weld seams and enabling the formation of various geometries like trapezoidal or triangular shapes, with the fold-in process occurring before welding to facilitate different configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a symmetrical construction with congruently large upper and lower walls is used, then the dust filter bag has structural stability, but it is difficult to adapt to different vacuum cleaner models and produces complex internal fold weld seams

Engineering Contradiction:

Improveadaptability to different vacuum cleaner modelsVSAvoidcomplexity of internal fold weld seams

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention applies asymmetry by making one fold member larger than the other, creating an asymmetric fold structure where the larger fold member forms a projection that extends beyond the edge of the second layer. This asymmetric design eliminates the need for complex internal fold weld seams while enabling adaptability to different vacuum cleaner models through variable fold geometries such as trapezoidal or triangular shapes.

Inventive Principle:

Principle #4Asymmetry

2Ease of manufacture

If the fold-in is produced by fold members formed by both upper and lower walls, then the fold structure is symmetrical, but the production process becomes difficult and requires welding within the fold

Engineering Contradiction:

Improveease of production processVSAvoidcomplexity of fold welding process

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The invention applies preliminary action by forming the fold structure before welding. The larger fold member is folded over the edge of the second layer to create a projection, and then welding is performed on the outer circumferential edge of this projection. This sequence eliminates the need for complex internal fold welding, as welding is performed on the external projection rather than within the folded structure.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If weld seams are present within the fold in the collapsed state, then the fold structure is sealed, but the geometry flexibility is limited and cannot produce various shapes

Engineering Contradiction:

Improvegeometry flexibilityVSAvoidsealing of fold structure

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The invention uses the projection formed by the larger fold member as an intermediary structure. The projection serves as both the sealing element (through welding on its outer edge) and the geometric adapter (by varying its shape to trapezoidal, triangular, or other forms). This intermediary projection enables geometry flexibility while maintaining sealing reliability, as the weld is performed on the external surface of the projection rather than within the fold.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8097054B2Dust filter bag

Publication Date: 2012.01.17 EUROLIFTERS HLDG NV

AI summary

A dust filter bag is in the shape of a flat bag for a vacuum cleaner, which is formed from a first layer and a second layer made of a weldable material. The layers are welded together circumferentially along the circumference thereof.