Counterbore Cup Ejector Wings for Jam-Free Debris Removal
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Solution Overview
Problem
Counterbore tools often trap shavings during drilling, leading to jamming and increased time for debris removal, especially when multiple holes are drilled consecutively, as the cup fills up with liberated material and becomes compacted.
Innovation Solution
A debris ejection mechanism within the cup that spins independently of the drill bit, featuring ramped or tapered wings to expel material through circumferential holes, allowing for efficient clearing of debris during and after drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a cup design is used to contain drilling material, then the counterbore depth can be accurately controlled, but the cup fills up with liberated material and becomes compacted, causing jamming and requiring periodic debris removal
Solution Approach 1:
The cup is segmented with circumferential holes and internal voids to divide the contained material into separate regions. This segmentation allows material to be contained for depth control while providing pathways for ejection, preventing compaction and jamming that would otherwise occur in a solid cup design.
Solution Approach 2:
The ejector mechanism is designed to rotate independently from the drill bit, creating dynamic motion that actively ejects material from the cup. This independent rotation allows the cup to maintain its depth-controlling function while the ejector dynamically clears material, resolving the contradiction between containment and ejection.
2Manufacturing precision
If the cup is designed to retain material for depth control, then accurate counterbore depth is achieved, but debris accumulates and must be periodically removed, increasing operational time
Solution Approach 1:
The ejector mechanism continuously rotates during the drilling operation to continuously eject material from the cup. This continuous action eliminates the need to stop drilling for debris removal, maintaining productivity while the cup retains material for depth control during the drilling process.
Solution Approach 2:
The ejector mechanism is driven by the drilling operation itself, using the rotation already present in the system to power the ejection function. The system serves itself by utilizing the drill's rotation to automatically clear the cup, eliminating the need for separate manual cleaning operations.
3Ease of operation
If material is allowed to exit during boring, then the hole remains clean, but the cup fills quickly with liberated material that is difficult to remove
Solution Approach 1:
The ejector mechanism acts as an intermediary between the contained material and the external environment. It mediates the ejection process by actively pushing material through the circumferential holes, creating a controlled exit path that maintains hole cleanliness while preventing the cup from filling with difficult-to-remove compacted material.
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
The solution effectively prevents jamming by continuously ejecting debris, maintaining hole cleanliness and ensuring accurate counterbore depth, thereby reducing operational time and effort.
Implementation Method 1
The ejection mechanism includes tapered wings with straight walls that push material trapped or compacted within the cup out of the cup through one or more holes around a circumferential portion of the cup
Data Source
AI summary
A debris ejector for a drilling tool is disclosed. In some cases, the ejector may be provided, for example, as part of a tool assembly (e.g., where ejector is coupled with bit, or both a bit and cup). In an example, a tool includes a cup and a drill bit passing through an internal void of the cup. The cutting end of the bit extends out the open end of the cup, while an attachment end of the bit extends out the back of the cup. The tool further includes an ejector within the cup. The ejector spins with the bit and independently of the cup. In one example, the ejector includes ramped or angled wings that eject material within the cup. In another example, the ejector includes tapered wings with straight and/or angled walls that push material out of the cup through one or more holes of the cup.