Retractable Writing Utensil Airtight Valve Sealing System
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Solution Overview
Problem
Existing writing utensils, such as markers and pens, face issues with cap loss leading to drying out and interference with eraser attachment, and prior solutions that eliminate caps hinder eraser application due to actuator placement on the back end, particularly for dry erase markers.
Innovation Solution
A retractable writing utensil design that incorporates a sealing system allowing the writing tip to extend and retract while maintaining a sealed, air-tight condition, and integrates an eraser on the body, eliminating the need for a cap and enabling convenient eraser use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a removable cap is used to cover the writing tip, then the tip is protected from drying out, but the cap can be lost during use and the design prevents attachment of an eraser to the back end
Solution Approach 1:
The patent removes the cap entirely and replaces it with a retractable tip mechanism featuring a sealed storage compartment. The writing tip extends through a sealing system only when needed, eliminating the cap while maintaining tip protection through the sealed compartment design.
Solution Approach 2:
The patent combines the eraser and actuator mechanisms into the back end of the marker body, integrating multiple functions into a single location that no longer requires a cap. This merging allows both eraser attachment and tip retraction control to coexist at the back end.
2Reliability
If an actuator is located on the back end to move the tip between positions, then the tip can be retracted into a sealed compartment, but the actuator prevents application of an eraser in this location
Solution Approach 1:
The patent merges the eraser and actuator mechanisms into a single integrated assembly at the back end of the marker. This allows both the eraser attachment and tip retraction control to occupy the same location without interfering with each other.
Solution Approach 2:
The back end of the marker is designed to serve multiple functions: housing the actuator mechanism for tip retraction, providing attachment for the eraser, and maintaining structural integrity. This multi-functional design eliminates the need to choose between actuator placement and eraser attachment.
3Reliability
If a sealing system is used to keep the writing tip retracted, then the tip does not dry out, but the system becomes more complex with additional components
Solution Approach 1:
The patent eliminates the need for separate sealing components by integrating the sealing function directly into the tip storage compartment design. The sealed compartment structure itself provides the sealing action, removing the need for additional sealing mechanisms.
Solution Approach 2:
The sealing system is designed to automatically seal the tip compartment when the tip is retracted, without requiring user intervention or complex active sealing mechanisms. The passive sealing design reduces complexity while maintaining moisture retention.
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 prevents tip drying out and allows for convenient eraser application on the back end, providing a capless writing instrument with an integrated eraser for dry erase markers, enhancing usability and functionality.
Implementation Method 1
using a ratchet mechanism and spring system to manage the tip's position
Implementation Method 2
using a ratchet mechanism and spring system to manage the tip's position
Implementation Method 3
A retractable writing utensil with an airtight valve... the writing tip can be extended out through the sealing system into a writing position, and then retracted back into the sealing system
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A writing utensil (10) having a distal end (12) and a proximal end (14) and extending generally along a longitudinal axis includes a casing (16) having a slot (28) extending generally along the longitudinal axis (A) adjacent the proximal end, an eraser (26) disposed on the proximal end of the casing, a valve (36) coupled to the casing adjacent the distal end and including a valve door (44), a writing tip (34) moveable between a stored position in which the tip is stored within the valve and a writing position in which the tip extends out of the valve, and an actuator (30) disposed in and slidable in the slot and operatively coupled to the writing tip such that movement of the actuator in the slot moves the writing tip between the stored position and the writing position.