Retractable Thermochromic Pen Layout for One-Handed Color Change
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Solution Overview
Problem
Conventional thermochromic writing instruments require two hands to switch between writing and storage states and have a friction body at the rear end, making it difficult to quickly change the color of handwriting with one hand.
Innovation Solution
A thermochromic writing instrument with a retractable pen tip and a friction portion on the barrel, allowing for one-handed operation and color change by positioning the friction portion on the outer surface, enabling easy switching between writing and storage states without reversing the barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the friction body is provided at the rear end of the barrel, then the structure is simple, but it is necessary to reverse the barrel and shift the holding part to change color, making it impossible to quickly shift to a rubbing-to-change-color operation
Solution Approach 1:
The friction body is inverted from the conventional rear-end placement to front-end placement on the barrel. This inversion allows the user to rub the handwriting with the friction body immediately after writing without reversing the barrel, thus quickly shifting to the rubbing-to-change-color operation while maintaining structural simplicity
2Adaptability or versatility
If the cap type structure is used, then the instrument can be stored with the pen tip retracted, but it is necessary to perform the attaching/detaching operation of the cap by using both hands, making it difficult to rapidly bring the instrument into a writing-capable state or a stored state
Solution Approach 1:
The cap is extracted from the barrel structure, and the pen tip is made movable by a projection/retraction mechanism. This allows the pen tip to be projected for writing or retracted for storage by operating the operation portion with one hand, eliminating the need for two-handed cap attaching/detaching operations while maintaining storage capability
Solution Approach 2:
The pen tip is made dynamic by providing a projection/retraction mechanism that allows it to move between projected and retracted states. This dynamic structure enables rapid switching between writing-capable state and stored state by operating the operation portion with one hand, improving the speed of state transitions
3Ease of operation
If the pen tip is made movable with a projection/retraction mechanism, then one-handed operation is enabled, but the device complexity increases
Solution Approach 1:
The projection/retraction mechanism is designed to be self-operating through the operation portion. The user's finger operation on the operation portion directly drives the pen tip projection/retraction without requiring complex control systems, thus enabling one-handed operation while minimizing device complexity
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 quick and easy switching between writing and storage states using one hand, allowing for efficient color change of handwriting without the need to reposition the instrument, enhancing user convenience.
Implementation Method 1
a friction portion (4) capable of thermally changing color of the handwriting of the thermochromic ink 83 by the frictional heat generated when the handwriting is rubbed with the friction portion 4
Implementation Method 2
a thermochromic writing instrument containing a thermochromic ink
Data Source
AI summary
A thermochromic writing instrument contains a thermochromic ink, wherein a writing body 8 is accommodated in a barrel 2 movably in a longitudinal direction, an operation portion 5 is provided on the outer surface of the barrel 2, and a pen tip 81 of the writing body 8 is constituted so as to be projectable/retractable from/into a front-end hole 31 of the barrel 2 by operating the operation portion 5. The thermochromic ink 83 is contained in the inside of the writing body 8, the pen tip 81 capable of ejecting the thermochromic ink 83 is provided at the front end of the writing tool, and a friction portion 4 capable of thermally changing the color of the handwriting of the thermochromic ink 83 by the frictional heat generated when the handwriting is rubbed with the friction portion 4 is provided on the outer surface of the barrel 2.