Hole Saw Sidewall Apertures for Deep Plug Extraction
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Solution Overview
Problem
Existing hole saws often require manual removal of the plug or core, which can be cumbersome and inefficient, especially when dealing with deep or large plugs.
Innovation Solution
The design incorporates a cylindrical body with a side wall that extends from a cap end to a cutting end, featuring a plurality of cutting teeth and strategically positioned slot portions that allow for the easy removal of plugs using a tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual removal of plugs is required, then the hole saw structure remains simple, but the ease of operation deteriorates and productivity decreases
Solution Approach 1:
The side wall of the cylindrical body is segmented with multiple apertures (first aperture, second aperture, third aperture) positioned at different locations. These apertures divide the solid side wall into sections, allowing extraction tools to access and remove plugs from different depths and positions within the cylindrical body, significantly improving ease of plug removal.
Solution Approach 2:
The patent introduces extraction tools as intermediary devices that work through the apertures in the side wall. These tools serve as mediators between the user and the trapped plugs, enabling indirect access and removal of plugs without requiring disassembly of the entire hole saw structure.
2Productivity
If manual removal of plugs is required, then the device complexity remains low, but the productivity deteriorates due to time-consuming manual intervention
Solution Approach 1:
The side wall is divided into multiple access points (apertures) that enable simultaneous or sequential extraction of multiple plugs without removing the hole saw from the workpiece. This segmentation allows continuous operation and significantly improves productivity by eliminating the need to stop and manually extract plugs through disassembly.
Solution Approach 2:
The apertures are pre-positioned in the side wall during manufacturing, allowing extraction tools to be immediately inserted and used once cutting is complete. This preliminary preparation of access paths eliminates time-consuming manual intervention and maintains high productivity.
3Ease of operation
If the side wall is solid without apertures, then the structural strength is maintained, but the ease of operation deteriorates due to difficulty in plug removal
Solution Approach 1:
The side wall is segmented with apertures that provide access paths without compromising overall structural integrity. The apertures are positioned and sized to maintain sufficient wall strength while enabling tool access for plug extraction.
Solution Approach 2:
Instead of creating large openings that would weaken the side wall, the patent uses multiple small apertures distributed across the side wall surface. This dimensional distribution provides access in multiple locations while maintaining the overall strength and rigidity of the cylindrical body.
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.