Knock-Type Pen Guide Groove Mechanism
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Solution Overview
Problem
Conventional knock-type pens often cause ink stains on clothing or bags due to unintended protrusion of the pen point when stored, especially with low-viscosity inks, leading to increased damage from ink flow.
Innovation Solution
A knock-type pen design featuring a housing with a '¬'-shaped guide groove and a rotating member with a 'l'-shaped slide groove, which prevents the pen point from protruding by fixing the moving protrusion when not in use, thereby preventing ink flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pen point is made to protrude easily by pressing the button unit, then the ease of operation is improved, but the reliability deteriorates because unintended pressing causes ink stains
Solution Approach 1:
The guide groove changes its constraint characteristics dynamically based on the position of the moving protrusion. In the initial position, it allows free movement for intentional button pressing. When the protrusion reaches a certain position during unintended pressing, the groove geometry changes to restrict further movement, thereby preventing ink stains while maintaining ease of operation.
2Ease of operation
If the guide groove is designed to allow free movement of the pressing member, then the ease of operation is improved, but the harmful effects worsen due to unintended pen point protrusion and ink flow
Solution Approach 1:
The guide groove transitions from a permissive state allowing free pressing member movement to a restrictive state that prevents excessive protrusion. This dynamic geometric constraint eliminates unintended ink stains while preserving the convenience of intentional button operation.
3Ease of operation
If the pen uses low-viscosity ink for easy writing, then the ease of operation is improved, but the object-affected harmful factors worsen due to increased ink flow and staining
Solution Approach 1:
The guide groove pre-establishes a geometric constraint that counteracts the harmful effect of low-viscosity ink flow. By restricting the pressing member's movement range before unintended pressing occurs, the system prevents ink stains even when using easy-flowing low-viscosity ink, thereby enabling the use of such ink without the associated staining problem.
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 from flowing out and causing stains on clothing or bags, regardless of ink viscosity, by restraining the pen point's protrusion during unintentional presses, thus protecting against ink contamination.
Implementation Method 1
a spring 21 is disposed between the housing 11 and the pen seam 12 to apply an elastic force to the pen seam 12 in a direction along which a pen point 13 retracts into the housing 11
Data Source
AI summary
Disclosed is a knock-type pen, which includes: a housing having a ‘¬’-shaped guide groove formed at a top end thereof; a pen seam accommodated in the housing; a pressing member having a moving protrusion provided at a lower end thereof and movably inserted into the guide groove; a rotating member rotatably coupled to an outer circumference of the top end of the housing and having a ‘l’-shaped slide groove into which an end of the moving protrusion inserted into the guide groove is movably inserted; and a knock unit disposed between the pressing member and the pen seam and configured to allow an end of the pen seam to move in and out at a lower end of the housing when the pressing member is pressed.