Knock Type Pen Locking Mechanism Prevents Ink Leakage
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Solution Overview
Problem
Conventional knock type pens are prone to ink leakage and staining when unintentionally pressed, especially with low viscosity ink, due to the nib being pushed out when the pen is carried on clothes or in bags.
Innovation Solution
A knock type pen design featuring a regulating element with a guide groove and a locking element that limits the downward movement of the knock element, preventing unintentional extension of the nib, even when subjected to unintended forces, using a locking mechanism that allows free extension but restricts retraction to prevent ink leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the knock type pen uses low viscosity ink to facilitate writing with small force, then writing smoothness is improved, but ink leakage increases when the nib is pushed out unintentionally
Solution Approach 1:
The patent introduces a locking element that preemptively prevents the knock element from being pushed down by unintentional forces. The locking element engages with the knock element to block downward movement, thereby preventing ink leakage before it can occur. This preliminary protective action allows the use of low viscosity ink without the risk of leakage from accidental knocks.
2Ease of operation
If the knock element is designed to extend freely for convenient writing, then ease of use is improved, but unintentional extension occurs when carried on clothes or in bags
Solution Approach 1:
The patent implements a dynamic locking mechanism where the locking element can engage or disengage from the knock element based on operational needs. During carrying, the locking element engages to prevent unintentional extension. During writing, the user can disengage the lock to allow free extension. This dynamic state change resolves the contradiction between ease of use and prevention of unintentional extension.
Solution Approach 2:
The locking element serves as an intermediary between the knock element and the housing. It mediates the interaction by selectively allowing or blocking the downward movement of the knock element. When engaged, it prevents unintentional extension during carrying; when disengaged, it allows free extension for writing, thus resolving the contradiction.
3Reliability
If a locking mechanism is added to prevent unintentional nib extension, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent divides the locking mechanism into separate, modular components: a locking element with a locking portion and a knock element with a corresponding engagement feature. This segmentation allows each component to be simple in design while collectively providing reliable locking functionality. The modular structure reduces overall complexity compared to a monolithic locking system.
Solution Approach 2:
The locking element acts as an intermediary component that adds minimal complexity to the system. Rather than redesigning the entire knock mechanism, a relatively simple locking element is introduced to mediate between the knock element and the housing, providing reliable prevention of unintentional extension with minimal increase in overall 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
Effectively prevents ink leakage and staining on clothes or bags by limiting the movement of the nib when the pen is not in use, applicable to both low and high viscosity inks, ensuring the nib remains retracted during unintended forces.
Implementation Method 1
a spring 21 is placed between the housing 11 and the lead 12 to apply an elastic force to the lead 12 in a direction in which the nib 13 retracts into the housing 11
Data Source
AI summary
A knock type pen including a housing, a lead which is received in the housing and has an end to which a nib is coupled, and a knock element which protrudes from top of the housing and is pushed, a regulating element which is rotatably installed on an outer circumference of the housing, and a locking element which is provided in the housing and moves up and down by rotation of the regulating element, wherein when the locking element moves up, a press of the knock element is limited by the locking element.