Hole Saw Slot Geometry for Easier Plug Ejection
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Solution Overview
Problem
Existing hole saws often require manual removal of the plug, which can be trapped within the cylindrical body, necessitating user intervention.
Innovation Solution
The design incorporates a cylindrical body with axially extending slots and apertures, including a first slot portion, a second slot portion, and a connecting slot portion, allowing for tool access to remove plugs efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cylindrical body is designed with a solid structure, then the structural strength is improved, but the plug removal becomes difficult requiring manual intervention
Solution Approach 1:
The cylindrical body is segmented with multiple apertures (first aperture, second aperture, third aperture) distributed around its circumference, allowing the plug to be accessed and removed from multiple locations without compromising overall structural integrity
Solution Approach 2:
Apertures are extracted from the cylindrical body to provide direct access to the trapped plug, enabling removal tools to reach and extract the plug without manual disassembly of the entire hole saw
2Ease of operation
If apertures are added to the cylindrical body, then the plug removal capability is improved, but the structural integrity deteriorates
Solution Approach 1:
Multiple smaller apertures are distributed around the cylindrical body rather than one large opening, maintaining structural integrity while providing adequate access for plug removal tools
Solution Approach 2:
The apertures are strategically positioned at specific locations (first, second, and third apertures) where they provide maximum access to the plug while minimizing impact on overall structural strength
Data Source
AI summary
A hole saw includes a substantially cylindrical body defining a cutting end and an axis of rotation. The hole saw also includes first and second apertures formed through the body and spaced from the cutting end such that a portion of the body extends between the cutting end and both the first and second apertures. The first and second apertures are both configured to receive a tool for removing work piece plugs from within the cylindrical body. The first aperture is axially spaced from the cutting end a first distance. The second aperture is axially spaced from the cutting end a second distance that is greater than the first distance. The first aperture and the second aperture are separated by a portion of the body.