Down-The-Hole Hammer Drill Bit Assembly
Patent No. EP3899189 (titled "Down-The-Hole Hammer Drill Bit Assembly") was filed by Sandvik Mining And Construction on Nov 27, 2019. The application was issued on Sep 13, 2023.
Patent Summary
A down-the-hole hammer drill bit assembly with improved flow distribution, comprising a drill bit connectable to the front end of the casing and provided with an anvil facing towards the piston for receiving the impacts of the piston, and an annular drive sub surrounding at least a portion of the shank and cooperating with the drill bit to form fluid passages extending length-wise along the shank. The drive sub comprises a concave arcuate groove extending circumferentially through the drive sub forming a chamber for collecting the fluid from the exhaust flow and redistributing the volume of the collected fluid to the flushing holes arranged in the drill bit.
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Date
Description
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EP3899189
- Application Number
- EP19808819A
- Filing Date
- Nov 27, 2019
- Status
- Granted And Under Opposition
- Aug 11, 2023
- Publication Date
- Sep 13, 2023
- External Links
- Slate, Register , Google Patents