Self-healing Seal Assembly for Retractable Writing Instruments
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Solution Overview
Problem
Retractable felt pens with self-healing films face system failures due to material build-up during nib extension and retraction, leading to seal failures and drying out issues, which complicates ink preservation and user convenience.
Innovation Solution
A writing instrument design featuring a tubular body with a seal assembly that includes a self-healing material and elastomeric supports to prevent dragging and restore sealing properties, allowing the nib to translate between retracted and extended positions without complex mechanisms, using elastomeric supports to stabilize and facilitate the self-healing material's function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a self-healing film is used to seal the nib when retracted, then ink evaporation is prevented and writing quality is maintained, but material build-up occurs at the penetration site during extension and retraction leading to system failure
Solution Approach 1:
The patent extracts the harmful interaction between the self-healing film and the nib by introducing a separate piercing mechanism. This mechanism pierces the film independently of the nib movement, preventing material build-up at the penetration site while maintaining the sealing function. The piercing mechanism is distinct from the nib assembly, allowing the film to be penetrated without direct contact between the nib and film during extension/retraction cycles.
Solution Approach 2:
The patent introduces a piercing mechanism as an intermediary element between the nib and the self-healing film. This intermediary performs the penetration function without causing material build-up issues, allowing the nib to move freely while the film is pierced at a controlled location. The intermediary mechanism resolves the conflict between sealing reliability and material build-up prevention.
2Reliability
If a complex mechanism is used to open and close the sealing chamber with each nib movement, then the nib can be properly sealed when retracted, but the device complexity increases
Solution Approach 1:
The self-healing film performs the sealing function automatically based on its material properties. When the nib is retracted, the film's elasticity causes it to conform to the nib surface and seal the chamber without requiring active control mechanisms. The film self-regulates its sealing state based on the nib position, eliminating the need for complex mechanical opening/closing systems.
Solution Approach 2:
The patent utilizes changes in the physical parameters of the self-healing film (elasticity, conformability) to achieve sealing. The film's ability to change its physical state based on mechanical deformation allows it to seal when the nib is retracted and allow penetration when pierced, providing a passive yet effective sealing mechanism that replaces complex active control systems.
3Ease of operation
If the self-healing film is penetrated by the nib during extension, then the nib can be extended for writing, but the film may not fully restore its sealing property leading to seal failure
Solution Approach 1:
The patent separates the penetration function from the nib by using a dedicated piercing mechanism. This extraction ensures that the film is pierced at a controlled location and manner that does not compromise its ability to restore sealing. The piercing mechanism creates a clean, controlled penetration that the film can effectively heal, unlike direct nib penetration which causes material build-up and sealing failure.
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 solution effectively prevents ink evaporation and maintains writing quality by ensuring the seal component can restore its sealing property quickly, reducing material build-up and extending the instrument's operational cycles while enhancing user convenience by eliminating the need for frequent recapping.
Implementation Method 1
The seal component may comprise a self-healing material. The seal component may be configured to at least partially restore its sealing property when the nib is retracted to the first retracted position.
Implementation Method 2
The seal assembly may comprise at least one elastomeric support. The at least one elastomeric support may be configured to prevent dragging of the self-healing material during the nib movement.
Data Source
AI summary
A writing instrument comprising a self-healing seal component to prevent drying out of the writing instrument and an elastomeric support to protect the self-healing seal component.