Fountain Pen Quick-Filling Coupling with Segmented Tanks
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Solution Overview
Problem
Fountain pens with piston tanks often experience ink leakage due to pressure differences at low altitudes, as the conventional large piston tanks are not effectively sealed, leading to ink loss during filling and use.
Innovation Solution
A fountain pen design featuring a quick-filling coupling with a main tank and a smaller writing tank, where the writing tank is directly connected to the nib assembly and can be refilled from the main tank, utilizing a system of sealing units controlled by a rotatable finial to manage ink flow and prevent leakage, and an ink feed device with air and ink channels for efficient filling and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large piston tank is used to store ink, then the ink supply capacity is improved, but ink leakage occurs due to pressure differences at low altitudes
Solution Approach 1:
The patent divides the single large piston tank into two separate tanks: a main tank for bulk ink storage and a writing tank for active ink supply to the nib. This segmentation isolates the writing tank (smaller volume) from the main tank, reducing the impact of pressure differences on the ink supply system and preventing leakage while maintaining adequate ink capacity.
2Reliability
If the writing tank volume is reduced, then the impact of low pressure is minimized, but the tank needs frequent refilling
Solution Approach 1:
The patent combines the main tank and writing tank into a unified system where the writing tank can be automatically refilled from the main tank through a connection passage. This merging allows the small writing tank to maintain pressure stability while eliminating frequent manual refilling, as the main tank continuously supplies ink to the writing tank.
3Ease of operation
If the coupling is exposed for filling, then the filling process is accessible, but the coupling is vulnerable to contamination
Solution Approach 1:
The patent extracts the filling function from the exposed coupling by introducing a separate filling valve that opens directly into the main tank. This allows users to refill the pen by activating the filling valve without exposing the coupling to contamination, as the filling process occurs through a protected pathway isolated from the external environment.
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 design significantly reduces ink leakage by allowing for selective control of fluid connections and refilling, maintaining ink supply to the nib assembly while minimizing the impact of low pressure, and enables easy cleaning and filling processes without exposing the coupling, enhancing user experience and pen functionality.
Implementation Method 1
a first sealing unit is arranged between the writing tank and the main tank, which first sealing unit can be selectively opened and closed for filling the writing tank via the main tank
Implementation Method 2
a second sealing unit is arranged between the writing tank and the nib assembly, which second sealing unit can be selectively opened and closed for supplying ink to the nib assembly
Implementation Method 3
a third sealing unit is arranged between the main tank and the coupling, which third sealing unit can be opened and closed for filling at least the main tank
Implementation Method 4
an ink feed device with air and ink channels for efficient filling and cleaning
Data Source
AI summary
A fountain pen with a quick-filling coupling includes a nib assembly, a housing with a main tank and a writing tank formed therein, a rotatable finial at an end of the fountain pen opposite from the nib assembly, and a coupling for placing the housing on an ink feed device. A first sealing unit, arranged between the writing tank and the main tank, can be selectively opened and closed for filling the writing tank via the main tank. A second sealing unit, arranged between the writing tank and the nib assembly, can be selectively opened and closed for supplying ink to the nib assembly. A third sealing unit, arranged between the main tank and the coupling, can be opened and closed for filling at least the main tank. The finial is operably coupled to the pen for controlling the opening state of the first and second sealing units.