Concentric Bit Puller for Stuck Drill Bit Extraction
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Solution Overview
Problem
Existing methods for removing stuck drill bits from workpieces often result in damage to the bit or workpiece due to off-center extraction or complex tool mechanisms, and existing tools are cumbersome and difficult to use, especially when the bit is stuck at varying depths.
Innovation Solution
A bit puller system comprising an inner element with a central shaft and external threads, and an outer element with internal threads, allowing for concentric engagement and rotation to withdraw the drill bit along a longitudinal axis, enabling self-engagement and easy removal at any depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a prying device such as a claw hammer or pry bar is used to pull the drill bit, then the drill bit can be removed from the workpiece, but the drill bit is pulled off center which may damage or alter the hole or workpiece or break the drill bit off
Solution Approach 1:
The bit puller employs a nested structure where an inner element with external threads is inserted into an outer element with internal threads. The inner element engages the drill bit while the outer element engages the workpiece, creating a concentric extraction system that prevents off-center pulling and potential damage.
2Productivity
If the drill motor is run in reverse to back the drill bit out, then removal may be achieved, but this does not work for very stuck drill bits where removed material jams the flutes
Solution Approach 1:
The bit puller separates the extraction function into two distinct elements: an inner element that engages the drill bit and an outer element that engages the workpiece. This segmentation allows independent optimization of each engagement point, enabling reliable extraction even when material jams the drill bit flutes.
3Ease of manufacture
If a normal collet attachment is used to attach to the bit, then attachment is achieved, but the attachment point is proximate the end of the shaft which is spaced from the workpiece, causing undesirable bending torque to be exerted on the bit
Solution Approach 1:
The inner element acts as an intermediary between the drill bit and the outer element. It provides a direct engagement point on the bit while maintaining concentric alignment with the workpiece through threaded connection to the outer element, eliminating bending torques by serving as a force transmission mediator.
4Object-affected harmful factors
If existing extraction tools with jaws and screws are used, then on-center extraction is achieved, but the screws are difficult to access and time consuming to tighten and loosen
Solution Approach 1:
The bit puller employs self-adjusting threaded engagement where the inner element's external threads automatically engage with the outer element's internal threads during insertion. This self-service mechanism eliminates the need for manual screw tightening and loosening, significantly reducing operation time while maintaining on-center extraction.
5Object-affected harmful factors
If existing extraction tools with multiple components are used, then on-center extraction is achieved, but the tools are fairly complicated because they include several different components that need to work together
Solution Approach 1:
The bit puller merges the functions of bit engagement, workpiece engagement, and force transmission into a integrated two-element system. The inner element combines bit engagement features with threaded connection, while the outer element combines workpiece engagement with internal threading, reducing component count while maintaining on-center extraction capability.
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 system effectively extracts drill bits without damaging them or the workpiece, simplifying the process by allowing engagement at any depth and reducing the complexity of tool operation, while being applicable to various machine tools and implements.
Implementation Method 1
Internal threads in the outer element are adapted to engage the external threads of the base wherein rotation of the inner element with respect to the outer element withdraws the inner element along the longitudinal axis
Data Source
AI summary
A bit puller incorporates an inner element with a longitudinal axis and having a central shaft, a base with external threads and an engagement mechanism internal to the inner element adapted to engage a drill bit. An outer element is concentric with the inner element and has a foot portion for engaging a work piece. Internal threads in the outer element are adapted to engage the external threads of the base wherein rotation of the inner element with respect to the outer element withdraws the inner element along the longitudinal axis.