Watermelon mill with replaceable cutting structure
US10081997B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2015 |
| Grant date | Sep 25, 2018 |
| Priority date | — |
| Expiry date | Oct 10, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/042
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A watermelon mill has a cutting structure mounted on a removable sleeve. The mandrel can be in two pieces threaded together to trap a ring or lug extending internally from the sleeve. Alternatively the sleeve can serve as a coupling holding together opposed threaded components that then make up the mandrel. The mandrel can have a radial external shoulder to act as a sleeve travel stop and another sleeve can be pushed into the first sleeve that has the cutting structure on it for proper axial fixation. The second sleeve that does not have cutting structure is pushed into position by making up an adjacent pin and box combination at a nearby connection to the cutting structure. What results is a flexible assembly that assembles without welding and retains greater flexibility in the larger sizes due to the assembly method. The sleeve can be tossed when the cutting structure is spent or redressed and remounted for another use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.