Multi-End Retractable Writing Instrument with Independent Color Selection
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Solution Overview
Problem
Conventional multi-color writing instruments, such as four-color ballpoint pens, face issues with large body diameter making them difficult to grip, limited ink capacity due to short refill lengths, and the need to retract one color before selecting another, which complicates handling and usage, especially for children.
Innovation Solution
A four-color ballpoint pen design with two retractable nibs at each end, allowing independent selection and retraction of colors from separate ends, featuring a central guide for long ink refills and a symmetrical body with diametrically opposed selection fins for easy operation and balanced handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all tips come out of the same end of the body, then color selection is simple, but the body diameter becomes large making it difficult to grip
Solution Approach 1:
The pen body is divided into two ends, with two tips at each end. This segmentation allows the tips to be distributed along the length of the pen rather than concentrated at one end, reducing the required body diameter while maintaining simple color selection through laterally accessible fins.
Solution Approach 2:
The selection fins are positioned laterally on the pen body rather than requiring axial movement. This dimensional change allows users to select colors by pressing side fins, maintaining operational simplicity while accommodating multiple tips at different ends of the pen.
2Area of stationary object
If the body diameter is reduced for easier grip, then handling improves, but the ink refill length and capacity are limited
Solution Approach 1:
The four ink refills are arranged in two parallel pairs, with two refills at each end of the pen. This segmented arrangement allows each refill to extend the full length of the pen body, maximizing ink capacity within the reduced diameter constraints.
Solution Approach 2:
The refills are positioned in parallel planes rather than radially around the center. This dimensional arrangement allows refills to utilize the full length of the pen body without increasing diameter, thereby increasing ink capacity.
3Device complexity
If one color must be retracted before selecting another, then the mechanism is simple, but usage efficiency decreases
Solution Approach 1:
The pen is divided into two independent end sections, each with its own tips and selection fins. This segmentation allows independent operation of each end, enabling simultaneous selection of different colors at opposite ends without requiring retraction of previously selected tips.
Solution Approach 2:
Each end of the pen can independently switch between different color tips without affecting the other end. This dynamic independence allows users to have multiple colors ready for use simultaneously, improving usage efficiency while maintaining simple retraction mechanisms at each end.
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
The instrument has an elongated body (1) comprising ends (16, 17) respectively provided with openings (18, 19). Retractable writing points (29, 30) are located towards the end (16) and selectively released through the opening (18). Other retractable writing points (31, 32) are located towards the end (17) and selectively released through the opening (19). Selection wings (33, 34) select and release one of the points (29, 30). Other selection wings (35, 36) is independent from the wings (33, 34), and selects and releases one of the points (31, 32).