Pivoting-Wing Reamer Drill Bit for Easy Pipe-Hole Extraction
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Solution Overview
Problem
Existing drill bits leave the reamer at the bottom of the drilled hole when pulling out the casing pipe, necessitating complex and inefficient removal processes.
Innovation Solution
A drill bit design incorporating a pilot bit with rotatably pivoted wings that extend outside the outer circle during drilling and retract inside when removing, allowing for easy extraction without additional actuators, and featuring controlled flushing medium flow for efficient drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a ring bit is used to drill the outer circle of the hole, then the hole size can be accurately controlled, but the ring bit remains trapped at the bottom of the drilled hole when the casing pipe is pulled out
Solution Approach 1:
The reamer is designed with movable wings that can dynamically change their position between extending outside the pilot bit body during drilling and retracting inside during removal. This dynamic configuration allows the reamer to maintain its function of controlling hole size while enabling easy extraction without trapping in the hole bottom.
2Ease of operation
If movable wings are used as reamers, then the drill bit can be easily removed from the hole, but the structure becomes more complex
Solution Approach 1:
The reamer employs movable wings that pivot relative to the pilot bit body, allowing the structure to adapt between drilling and removal phases. This dynamic design achieves easy removal functionality while keeping the overall structure relatively simple through the use of basic pivoting mechanisms rather than complex actuation systems.
3Area of moving object
If the wing extends outside the outer circle of the pilot bit body during drilling, then the drilling surface area is increased, but the wing cannot be reliably positioned for easy removal
Solution Approach 1:
The wing is designed with rotational freedom relative to the pilot bit body, allowing it to dynamically adjust its position. During drilling, the wing extends outside the outer circle to maximize drilling surface area. During removal, the wing can be rotated to a retracted position inside the outer circle, ensuring reliable positioning and easy extraction without interference with the pipe.
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
Enables reliable and efficient hole drilling for pipe installation with easy removal of the drill bit from the hole, ensuring a clean exit and minimizing material loss.
Implementation Method 1
The wing comprises at least one bracket and an outer part such that the outer part of the wing is arranged to turn the flow of flushing medium
Data Source
AI summary
Here is presented a drill bit (1) which includes a pilot bit (2) and a reamer. The pilot bit (2) includes a body (3) and a drilling surface (4). The drill bit (1) is arranged to provide a hole for a pipe to be installed in the ground. The reamer comprises at least one wing (7) which is turnably pivoted to the body (3) of the pilot bit (2) such that the wing (7), when turned to a drilling position, extends outside the outer circle of the body (3) of the pilot bit (2) and, when turned to a position turned forwards from the drilling position, the wing (7) does not extend outside the outer circle of the body (3) of the pilot bit (2).