Inverted direct drive feed system
US11603717B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2020 |
| Grant date | Mar 14, 2023 |
| Priority date | — |
| Expiry date | May 5, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/023
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An exemplary derrick assembly includes a frame, a hydraulic cylinder assembly, a drive assembly, and a hydraulic assembly. The hydraulic cylinder assembly is mounted to the frame, and includes a piston rod, a single-tube cylinder body, and a hydraulic chamber. The piston rod is secured to the frame, and the cylinder body is mounted to the piston rod for reciprocal movement between proximal and distal positions. The hydraulic chamber is defined in part by the piston rod and the cylinder body, and expands and contracts with movement of the cylinder body. The drive assembly is mounted to the cylinder body for movement with the cylinder body. The hydraulic assembly configured to charge hydraulic fluid into and out of the hydraulic chamber to cause the hydraulic chamber to expand and contract, thereby moving the cylinder body and the drive assembly between the proximal position and the distal position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.