Percussion boring device and method for reversing a percussion boring device
US11634949B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2016 |
| Grant date | Apr 25, 2023 |
| Priority date | — |
| Expiry date | Jul 2, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B4/145
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A percussion boring device comprising a casing, a guide tube fixed to the casing, and a control bushing axially displaceable on the guide tube. An impact piston of the device is axially displaceable on the control bushing and configured to be actuated in a reciprocating manner within the casing such that in a first switching position the impact piston strikes a front impact surface to actuate the percussion boring device in a first movement direction, and in a second switching position a rear impact surface to actuate the percussion boring device in a second movement direction. A pressure increasing means is provided and configured to generate a pressure for reversing the percussion bore device, wherein the generated pressure is higher than a pressure for moving the impact piston. The guide tube and the control bushing are configured to reverse movement directions of the impact piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.