Pressurized Pen Elastic Cylinder Segmentation
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Solution Overview
Problem
Conventional pressurized pens require significant force for knocking due to insufficient sealing and high elastic coefficient of the loop-shaped elastic ring, leading to a poor writing experience.
Innovation Solution
A pressurized pen design featuring an elastic cylindrical pressurizing member with a large-diameter front cylinder and small-diameter rear cylinder, allowing for easy compression and decompression, which is driven by a cam mechanism to pressurize the ink containing tube with minimal force, enabling smooth ink flow and comfortable usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a loop-shaped elastic ring is used for sealing in the press pump mechanism, then sealing ability is improved, but the force required for knocking operation increases due to high elastic coefficient
Solution Approach 1:
The elastic cylindrical member is divided into two distinct cylindrical portions: a front cylinder portion with larger outer diameter for sealing, and a rear cylinder portion with smaller outer diameter for compression. This segmentation allows each portion to have optimized dimensions for its specific function, resolving the contradiction between sealing ability and knocking force.
Solution Approach 2:
Different portions of the elastic cylindrical member have different outer diameters tailored to their local functions. The front cylinder portion has a larger outer diameter to provide adequate sealing contact with the ink containing tube, while the rear cylinder portion has a smaller outer diameter to reduce the force needed for compression during knocking operation.
2Reliability
If the outer diameter of the loop-shaped elastic ring is increased to improve sealing, then sealing ability is improved, but the elastic coefficient increases requiring larger knocking force
Solution Approach 1:
The elastic cylindrical member is divided into two distinct cylindrical portions: a front cylinder portion with larger outer diameter for sealing, and a rear cylinder portion with smaller outer diameter for compression. This segmentation allows each portion to have optimized dimensions for its specific function, resolving the contradiction between sealing ability and knocking force.
Solution Approach 2:
Different portions of the elastic cylindrical member have different outer diameters tailored to their local functions. The front cylinder portion has a larger outer diameter to provide adequate sealing contact with the ink containing tube, while the rear cylinder portion has a smaller outer diameter to reduce the force needed for compression during knocking operation.
3Reliability
If a large design value of outer diameter is used for the elastic ring, then sealing ability is improved, but a spring with high elastic coefficient is required increasing knocking force
Solution Approach 1:
The elastic cylindrical member is divided into two distinct cylindrical portions: a front cylinder portion with larger outer diameter for sealing, and a rear cylinder portion with smaller outer diameter for compression. This segmentation allows each portion to have optimized dimensions for its specific function, resolving the contradiction between sealing ability and knocking force.
Solution Approach 2:
Different portions of the elastic cylindrical member have different outer diameters tailored to their local functions. The front cylinder portion has a larger outer diameter to provide adequate sealing contact with the ink containing tube, while the rear cylinder portion has a smaller outer diameter to reduce the force needed for compression during knocking operation.
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 design allows for an easy knocking operation with small force, maintaining a pressurized state within the pen, preventing ink leakage, and ensuring smooth writing even when the pen is used in an upward position.
Implementation Method 1
a pressurizing member which has a pressurizing chamber communicating with the inside of the medium containing tube and which is disposed on the rear opening portion of the medium containing tube so as to freely expand and contract in an axial direction
Implementation Method 2
the inside of the medium containing tube is pressurized by allowing the pressing member to press the rear cylinder portion into the front cylinder portion and compressing the elastic cylindrical member in the axial direction
Data Source
AI summary
A pressurized pen having excellent feeling of using it by allowing an easy knocking operation with small force is disclosed. The pressurizing member 18 includes an elastic cylindrical member 19. The elastic cylindrical member 19 has a large-diameter front cylinder portion of which a front end 20a in air-tight manner communicates directly with the rear opening portion 6b of an ink containing tube 6 and which forms the pressurizing chamber 22, and a small-diameter rear cylinder portion 21 which is coaxially connected to a rear end of the front cylinder portion 20 and in which the front end portion 17a of the pressing member 17 is pressed into a rear aperture 21a thereof. The inside of the ink containing tube 6 is pressurized by allowing the pressing member 17 to press the rear cylinder portion 21 into the front cylinder portion 20 and compressing the elastic cylindrical member 19 in the axial direction with the pressing chamber 22 air-tight.