Fountain Pen Internal Valve System for Ink Leakage Prevention
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Solution Overview
Problem
Conventional fountain pens suffer from ink leakage due to pressure changes and messy refilling procedures, where ink leaks out during changes in external pressure and the refilling process involves immersing the nib and ferrule in ink, leading to ink film coating and subsequent cleaning requirements.
Innovation Solution
A fountain pen design featuring an internal valve system with an elastomer joint and refill piston that selectively opens and closes the ink flow, preventing leaks by maintaining pressure equilibrium and allowing clean refilling by isolating the nib and ferrule from the ink supply during refilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the air hole is immersed in ink during refilling, then ink flows into the reservoir, but the nib and ferrule become coated with ink film requiring cleaning
Solution Approach 1:
The feed assembly is separated into a removable component that can be detached from the barrel. This segmentation allows the reservoir to be refilled independently while keeping the nib and ferrule isolated from the ink pool, preventing ink film coating on writing components.
Solution Approach 2:
The feed assembly containing the nib and ferrule is extracted from the ink refilling process. By removing the feed assembly before refilling and reconnecting it after, the writing components are taken out of harm's way and prevented from contacting the ink pool.
2Ease of operation
If the reservoir is open to allow refilling, then ink can be replenished, but ink leaks out during pressure changes
Solution Approach 1:
The feed assembly is removed before refilling takes place. This preliminary action ensures that the nib and ferrule are not present to become coated with ink, and the refilling process can occur cleanly without risk of leakage during reconnection.
Solution Approach 2:
The feed assembly acts as an intermediary component that connects the reservoir to the nib. By removing and reattaching this intermediary, the system allows clean refilling while preventing direct exposure of the nib to the ink pool.
3Ease of operation
If conventional refilling is used, then the procedure is simple, but it requires cleaning the nib and ferrule after refilling
Solution Approach 1:
By segmenting the feed assembly as a removable component, the invention enables refilling without cleaning. The separation allows the reservoir to be refilled independently while the nib and ferrule remain isolated, eliminating the time-consuming cleaning step entirely.
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
The internal valve system effectively prevents ink leakage during pressure changes and ensures a clean refilling process by maintaining ink flow control and keeping the writing components dry, thus enhancing user convenience and reducing ink stains.
Implementation Method 1
the central orifice is closable by expansion of the elastomer joint upon compression of the elastomer joint in a direction parallel to the longitudinal axis of the barrel body
Implementation Method 2
the refill piston is movable along the longitudinal axis of the barrel body between a first position, at which the volume of the reservoir is at a minimum, and a second position, at which the volume of the reservoir is at a maximum, forcing ink from the ink supply into the reservoir when moving from the first position to the second position
Implementation Method 3
Ink flows from the reservoir to the writing nib via capillary action
Data Source
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AI summary
A fountain pen having a barrel body (12) with a reservoir (14) and an open end (15). A valve (32) is disposed within the barrel body between the reservoir and the open end, the valve selectively opening and closing the open end. A feed assembly (17) includes a ferrule (18) and a nib support (34) that is slidably coupled to the ferrule. A valve opening mechanism (68) extends from one end of the nib support and the valve opening mechanism pushes the valve towards an open position in response to removal of a cap (22) from the feed assembly.