Kelly bar with locking feature, related system and method
US10890033B1 · kind B1 · utility
2Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2018 |
| Grant date | Jan 12, 2021 |
| Priority date | — |
| Expiry date | Feb 26, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/07
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A Kelly bar apparatus includes a plurality of concentric tubes in a telescoping arrangement having either a locking feature provided by a series of keys and notches that interlock selectively, or one or more blocking tabs that prevent complete telescopic extension of at least one of the tubes when the tubes and associated keys are in an unlocked position, or both. Related subterranean bore drilling systems and drilling methods are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.