Drill Bit Retractable Reamer Wings for Pipe Extraction
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Solution Overview
Problem
Conventional drill bits often leave the ring bit and protective pipe in the drilled hole, necessitating additional steps for removal and increasing drilling time and costs.
Innovation Solution
The drill bit features reamer blade wings that extend beyond its largest outer diameter during drilling to enlarge the hole and accommodate the protective pipe, then retract to allow the bit to be pulled out, eliminating the need for any parts to be left in the hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the drill bit uses reamer blade wings that extend beyond the largest outer diameter during drilling, then the hole enlargement capability improves and protective pipe accommodation is achieved, but the device complexity increases due to movable blade mechanism
Solution Approach 1:
The reamer blade wings are designed to be movable relative to the drill bit body, allowing them to extend beyond the largest outer diameter during drilling operations to enlarge the hole and accommodate the protective pipe, then retract during withdrawal to reduce the overall diameter. This dynamic configuration enables the drill bit to adapt its dimensions based on operational requirements, resolving the contradiction between hole enlargement capability and device complexity by making the extended structure temporary and controllable rather than permanent
2Productivity
If conventional drill bits leave the ring bit in the drilled hole, then the drilling process is simplified, but additional removal steps are required and drilling time increases
Solution Approach 1:
Instead of leaving the ring bit in the hole as in conventional drilling, this invention enables the drill bit to completely withdraw from the hole by retracting the reamer blade wings during withdrawal. This inverted approach transforms the conventional practice of leaving components in place into a complete removal system, thereby eliminating additional removal steps and reducing overall drilling time while maintaining drilling efficiency
3Stability of the object's composition
If the reamer blade wings remain extended during withdrawal, then the hole maintains its enlarged size, but the drill bit cannot be pulled out through the protective pipe
Solution Approach 1:
The reamer blade wings are designed to change their radial position dynamically based on the operational phase: extended during drilling to maintain hole enlargement and accommodate the protective pipe, then retracted during withdrawal to reduce the drill bit's overall diameter below the protective pipe's inner diameter, enabling complete withdrawal. This dynamic adjustment resolves the contradiction between maintaining hole size consistency and facilitating drill bit withdrawal
Data Source
Figure 1~2
Figure 3~4
AI summary
A drill bit (1) comprises a body (2) of the drill bit (1) and at a distance from a face of the drill bit (1), reamer blade wings (21) moving outwards from a side (6) of the body (2) of the drill bit (1). When the drill bit (1) is rotated in the intended drilling direction, the reamer blade wings (21) are adapted to move outwards from the side (6) of the body (2) of the drill bit (1), extending outside the largest outer diameter of the body (2) of the drill bit (1) to enlarge the hole being drilled. When the drill bit (1) is rotated in the opposite direction, the reamer blade wings (21) are adapted to return inside the largest outer diameter of the body (2) of the drill bit (1) for pulling the drill bit (1) out of the hole being drilled.