Hole Saw Sidewall Apertures for Tool-Assisted 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 side walls featuring multiple slots and apertures, including a first slot portion, a second slot portion, and connecting slot portions, allowing for tool access to facilitate easy removal of plugs without manual intervention.
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 slots (first slot portion, second slot portion, and connecting slot portion) that divide the solid structure into accessible sections. These slots allow plug removal tools to access and extract the plug without compromising the overall structural integrity of the hole saw during cutting operations.
Solution Approach 2:
The slots act as intermediaries between the plug trapped inside the cylindrical body and the external plug removal tool. By providing these access pathways, the design enables indirect interaction between the tool and plug, allowing removal without manual disassembly of the entire cylindrical body.
2Ease of operation
If the cylindrical body includes multiple slots and apertures, then the plug removal ease is improved, but the structural complexity increases
Solution Approach 1:
The slot system is segmented into distinct portions (first slot portion, second slot portion, connecting slot portion) with specific geometric relationships. Each portion serves a functional purpose in tool access while the overall segmentation follows a systematic pattern that manages complexity through modular design.
Solution Approach 2:
The slots are strategically positioned and dimensioned with specific local characteristics (axial offsets, orientations, connecting portions) only where needed for plug removal functionality. The rest of the cylindrical body maintains its simple solid structure, so complexity is localized to only the areas requiring plug extraction capability.
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.