Centerless Drafting Tool Radius Adjustment Mechanism
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Solution Overview
Problem
Conventional compasses are inefficient and complex when drawing large arcs or circles, especially when the center is inaccessible or obstructed, and they often require excessive space.
Innovation Solution
A drafting compass with a housing, control dial, drive gear, adjustment gears, and wheels that allow for easy adjustment of radius by rotating the dial, enabling the compass to draw arcs and circles without needing to access the center and accommodating various radii through a simple dial-based mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional compasses are used to draw large arcs or circles, then the drawing function is achieved, but the device requires excessive space and center access that is often unavailable
Solution Approach 1:
Instead of having the compass center fixed at the origin and the arc drawn by rotation, this invention inverts the approach: the compass body is rotated along a fixed center point, allowing the arc to be drawn without requiring the center to be accessible or the workspace to be large. The wheel rotates on a fixed axis while the compass body follows the arc path.
Solution Approach 2:
The compass is divided into separate functional components: a fixed center point, a rotating wheel, and a compass body that follows the arc. This segmentation allows each component to perform its function independently, enabling large arc drawing without requiring the entire compass structure to be large or the center to be accessible.
2Ease of operation
If conventional compasses are used when the center is inaccessible or obstructed, then the drawing function is attempted, but the operation becomes complex and time-consuming
Solution Approach 1:
The invention eliminates the need for center access by inverting the conventional compass operation. Instead of the compass center being fixed at the origin, the wheel rotates on a fixed axis while the compass body follows the arc path, allowing drawing operations even when the traditional center point is inaccessible or obstructed.
Solution Approach 2:
The compass body automatically follows the arc path as the wheel rotates, eliminating the need for manual adjustment or complex operations. The device self-adjusts to maintain the correct arc geometry without requiring the user to manually position or reposition the center point.
3Productivity
If conventional compasses are used for large radius drawings, then the drawing function is achieved, but the device structure becomes complex and inefficient
Solution Approach 1:
The invention simplifies the compass structure for large radius drawings by inverting the conventional design. Instead of a complex mechanism to accommodate large radii, a simple rotating wheel on a fixed axis with a compass body that follows the arc path provides the same functionality with minimal structural complexity.
Solution Approach 2:
The invention extracts the essential function of arc drawing from the conventional compass structure, separating the wheel rotation mechanism from the compass body. This extraction allows the compass to be simpler and more efficient, as the wheel handles the rotational motion while the compass body simply follows the arc path without requiring complex adjustment mechanisms.
Data Source
AI summary
A compass, comprising: a housing; a control dial; a drive gear, wherein the drive gear is attached to the control dial; an adjustment gear, wherein the adjustment gear is in in communication with the driver gear; a first gear portion in communication with the driver gear; a second gear portion in communication with the adjustment gear; and a plurality of wheels, wherein the wheels are secured to the first and second gear portions.