Hole Saw Adapter Axial Groove Core Ejection
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Solution Overview
Problem
Existing hole saw adapters are cumbersome and require specialized tools or heavy components to remove drill cores, making the process inefficient and costly.
Innovation Solution
A universal hole saw adapter with a longitudinally running axial groove and a displaceable holding part that allows axial displacement of the central drill, equipped with a mechanical handle or spring for easy core removal, using standard drills and magnets for secure fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ejector ring is used to maintain the central drill and prevent rotation, then the drill is secured in position, but the device becomes very heavy to displace and requires specialized drills
Solution Approach 1:
The patent replaces the heavy mechanical ejector ring system with a magnetic field-based holding mechanism. Magnets embedded in the adapter body's groove replace the mechanical retention function of the ejector ring, eliminating the need for heavy displacement forces and specialized drills while maintaining secure drill positioning.
Solution Approach 2:
The patent introduces a spring mechanism that uses elastic potential energy storage and release to automatically push the central drill into the workpiece. This spring-driven system replaces manual displacement operations, automating the drill positioning process and eliminating the need for heavy manual handling.
2Ease of operation
If a piston connected to a drill is used to force out the core, then core removal is achieved, but the device complexity increases
Solution Approach 1:
The patent extracts the core removal function from the drilling process itself. After drilling, the central drill is pulled back into the adapter body, and the core is automatically ejected through the groove structure. This separates the core ejection function from the drilling operation, simplifying the overall device while maintaining effective core removal.
Solution Approach 2:
Instead of pushing the core out during drilling as in conventional systems, the patent inverts the approach by allowing the core to remain in place during drilling and then ejecting it afterward through a different mechanism. The groove structure enables backward ejection of the core after the drilling cycle completes.
3Ease of operation
If a slit is made in the hole saw to insert a screwdriver, then core removal is possible, but the hole saw structure is compromised
Solution Approach 1:
The patent introduces a central drill as an intermediary tool that performs the core removal function. Instead of modifying the hole saw structure with slits, the central drill penetrates through the material and pushes the core out through its own cutting action, preserving the integrity of the hole saw while achieving core removal.
Solution Approach 2:
The patent divides the drilling and core removal functions into separate operational phases. The hole saw performs the cutting function while the central drill performs the core ejection function. This segmentation allows each component to maintain its structural integrity while performing its specialized function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Simplifies the removal of drill cores with reduced production costs and ease of operation, allowing for efficient use with various hole saw types and materials.
Implementation Method 1
it can simply be equipped with a spring, hydraulic, compressed air or other means to drive out the core
Implementation Method 2
using standard drills and magnets for secure fastening
Data Source
Figure 1~4
Figure 5~8
Figure 9
AI summary
Hole saw adapter (10) comprised of an adapter body (12) with a first end equipped with a spindle (14) for fastening to a drive unit, such as a drilling machine, and a second end to receive a hole saw (32) and a central drill (34), in which the adapter body (12) is extended and equipped with a longitudinally running axial groove (16) where the longitudinally running axial groove (16) is at least partially formed as a cross-wise through-running open slit in the adapter body (12). The central drill (34) is fasten to the inner axially displaceable holding part (22) so that it can be made loose, said inner axially displaceable holding part (22) can be displaced in the longitudinally running axial groove (16) in the adapter body (12) and is fastened to an external displacement part (18), as the external displacement part (18) surrounds the adapter body (12) and is set up for a forced axial displacement of the axially displaceable holding part (22) and the central drill (34) in the longitudinally running axial groove (16) for the pushing out of a core (40) that remains in the hole saw (32) after drilling.