Foundation drilling apparatus and method with continuously variable hydraulic differential rotary table
US7093679B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 2004 |
| Grant date | Aug 22, 2006 |
| Priority date | — |
| Expiry date | Dec 13, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2047/045
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A drilling machine drills foundation holes known as drilled shafts or bored piles with a drilling tool attached to an end of a kelly. The kelly is rotated with a rotary drive. The rotary drive has a first motor, a final drive gear coupled to the kelly so as to rotate with the kelly and a planetary gear set between the first motor and the final drive gear. A second motor is coupled to the ring gear on the planetary gear set. A clutch can also be connected to the ring gear. The rotary drive allows the drilling tool to be rotated at low drilling speeds and, without stopping rotation or shifting gears, removed from the hole and accelerated to high speeds to discharge spoil. A mid-range is also possible, wherein the drilling tool can process fluids in the hole. Another motor and planetary gear set can be coupled to the final drive gear and to the second motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.