Porous Tip Liquid Applicator Draw Fill Mechanism
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Solution Overview
Problem
Existing porous tip liquid applicators are often prefilled with liquid, limiting user flexibility and convenience, especially in applications where custom or site-specific liquids are needed, such as in wood finishing, where matching custom-mixed stains can be challenging for future repairs.
Innovation Solution
A porous tip liquid applicator with a draw fill mechanism, featuring a plunger and plunger handle that allows users to fill the applicator with selected liquids, including custom-mixed materials, by creating a partial vacuum to draw the liquid into the reservoir, and then disengaging for easy storage and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If porous tip liquid applicators are prefilled with liquid, then the applicator is ready for immediate use, but user flexibility and convenience are limited when custom or site-specific liquids are needed
Solution Approach 1:
The applicator is divided into separable components: a removable plunger assembly and a refillable reservoir. This segmentation allows the plunger to be extracted for refilling operations while the reservoir remains in place, providing user flexibility to refill with custom liquids without replacing the entire applicator.
Solution Approach 2:
The plunger is designed with dynamic engagement features including resilient biasing and movable sealing elements that adapt during insertion and removal. The plunger can be easily inserted and secured, then removed for refilling, and reinserted to restore sealing - providing dynamic flexibility for user refilling operations.
2Adaptability or versatility
If a plunger mechanism is added to enable refilling, then user flexibility improves, but the device complexity increases
Solution Approach 1:
The plunger mechanism serves multiple functions: it creates vacuum for drawing liquid into the reservoir, provides sealing to prevent leakage, and acts as a removable component for facilitating refilling. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The resilient plunger automatically biases to engage with the reservoir opening and create sealing without requiring additional actuation mechanisms. The plunger's own elasticity provides the necessary force for sealing and liquid drawing, eliminating the need for external springs or motorized components.
3Ease of operation
If the plunger handle extends through the end cap for operation, then ease of use improves, but the applicator requires reconfiguration after filling
Solution Approach 1:
The plunger handle is pre-configured with engagement features that automatically interface with corresponding features on the plunger body during insertion. This preliminary design of the engagement mechanism allows for quick connection and disconnection without requiring manual reconfiguration or adjustment after filling operations.
Solution Approach 2:
The plunger assembly is designed as a disposable or easily replaceable component. After use, the entire plunger assembly can be discarded or replaced without requiring disassembly or reconfiguration of the main applicator body, saving time on reconfiguration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables users to fill the applicator with specific liquids on-site, ensuring availability of the exact liquid for future touch-ups or repairs, avoiding color matching issues and providing a convenient, customizable solution for various flowable liquids beyond just ink.
Implementation Method 1
by creating a partial vacuum to draw the liquid into the reservoir
Data Source
AI summary
A liquid applicator includes an elongated cylindrical body having an end cap within which a plunger is slidably moveable. The cylindrical body defines a bore receiving a plunger seal and piston secured to the interior end of a sliding plunger handle. The remaining end of the cylindrical body is coupled to a porous nib having a flow control valve in communication therewith. The plunger is removable from the piston and sealing plunger following the liquid filling process.