Airless Dispenser Piston With Single Sealing Line and Guide Points

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Solution Overview

Problem

Existing dispensers without air intake have visible and ungainly pistons that detract from the aesthetic appeal of cosmetic or pharmaceutical products, particularly when the reservoir is transparent or translucent.

Innovation Solution

A piston design featuring a central axis with sealing means forming a single external sealing line and guiding means with discrete external guide points, minimizing contact with the reservoir's inner wall, and utilizing materials with antimicrobial properties to enhance aesthetics and functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pistons with two sealing lips are used, then sealing function is ensured, but the piston becomes visible and ungainly through the transparent reservoir

Engineering Contradiction:

Improvesealing functionVSAvoidaesthetic appearance

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The piston is segmented into only two essential elements: a single sealing lip for sealing function and discrete guide points for guidance. This segmentation eliminates the bulky two-lip structure while maintaining functionality, making the piston invisible through the transparent reservoir.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention extracts only the necessary functional elements from the conventional piston design. The second sealing lip is removed entirely, and guiding surfaces are replaced with discrete guide points, leaving only the essential sealing and guidance functions visible through the reservoir.

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of operation

If the piston includes guiding surfaces, then guidance function is provided, but the contact surface with the reservoir wall increases making the piston more visible

Engineering Contradiction:

Improveguidance functionVSAvoidcontact surface area

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The guiding function is segmented from continuous surfaces into discrete guide points. These points are distributed around the piston circumference and provide sufficient guidance while minimizing the contact area with the reservoir wall, keeping the piston invisible.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guiding function is concentrated at specific local points rather than distributed across large surfaces. The guide points are strategically positioned to provide adequate guidance while maintaining minimal contact area, resolving the contradiction between guidance effectiveness and visibility.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20260028172A1Piston for a reservoir of a dispenser of a fluid product without air intake

Publication Date: 2026.01.29 SILGAN DISPENSING SYST LE TREPORT

AI summary

A piston for a reservoir of a dispenser of a fluid product without air intake and presenting a central axis X includes both sealing means and also guiding means. The sealing means extend in a plane orthogonal to the axis X and define a single external sealing line in a closed loop, distal from the axis X, capable of coming into contact with an inner wall of the reservoir 10. The guiding means include a base from which extends one or more tabs with free ends defining external guide points, distal from the axis X, capable of coming into contact with the inner wall of the reservoir.