Rotary Solid Marker Core for Variable Line Thickness
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Solution Overview
Problem
Existing draw-out type solid markers have difficulty in varying line thickness, requiring multiple applications or sharpening to achieve different line widths, limiting the creation of various patterns.
Innovation Solution
A draw-out solid marker with a solid core having an elliptical, rectangular, or triangular cross-section, coupled with a rotary member and shell design that allows for adjustable line thickness by rotating the core within the shell, enabling easy change in line thickness without needing multiple cores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical or polygonal cylindrical solid core is used, then the structure is simple and easy to manufacture, but it is difficult to create various line thickness patterns
Solution Approach 1:
The solid core is designed with an asymmetric cross-sectional shape (elliptical, rectangular, or triangular) instead of a symmetric cylindrical shape. This asymmetric geometry allows the core to rotate within the shell, exposing different surface areas and angles to the writing surface, thereby enabling variation in line thickness without requiring multiple cores or sharpening operations.
Solution Approach 2:
The solid core is made rotatable within the shell through a rotary member mechanism. By rotating the core to different angular positions, the user can dynamically change the effective contact area and orientation of the core surface, thus varying the line thickness in real-time during writing or drawing operations.
2Ease of manufacture
If a cylindrical solid core is used, then the manufacturing is simple, but multiple applications or sharpening is required to draw lines with various thicknesses
Solution Approach 1:
The rotary member enables the solid core to be rotated to different angular positions, allowing the user to vary line thickness by changing the orientation of the core rather than requiring multiple applications or sharpening. This dynamic adjustment saves time and maintains manufacturing simplicity.
Solution Approach 2:
A single solid core with asymmetric cross-section serves multiple functions by being rotatable to different positions, replacing the need for multiple cores with different diameters or shapes. This multi-functionality reduces the time required for selecting, changing, or sharpening cores while maintaining ease of manufacture.
3Adaptability or versatility
If the solid core is made rotatable within the shell, then various line patterns can be created with a single core, but the device complexity increases
Solution Approach 1:
The rotary member is nested within the shell, with the solid core mounted on the rotary member. This nested arrangement allows the rotation mechanism to be compact and integrated within the existing marker structure, minimizing additional space and complexity while enabling line pattern variety.
Solution Approach 2:
The rotary member combines multiple functions: it supports the solid core, enables rotation, and may include threading for engagement with the shell. By merging these functions into a single component, the overall device complexity is reduced while still achieving various line patterns through rotation.
Data Source
AI summary
A draw-out solid marker includes a cylindrical shell, a rotary member thread-fastened to the rear end of the shell; a movable member thread-fastened to the rotary member in the shell to move forward/backward from the shell by rotating the rotary member; a cylindrical solid core connected to the front of the movable member to move forward/backward with the movable member and having an elliptical, rectangular, or triangular cross-sectional shape; and a cap coupled to the front end of the shell in order to apply various patterns in accordance with the position of the front end.