Boring head method and boring head for a ground boring device
US7938205B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 2005 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Oct 13, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to a boring head for a ground-boring device displacing earth with a percussive action, comprising at least three boring head sections, of which the first section has a form optimized for the loosening and for guiding the device, the second section is optimized with regard to the radial displacement of the earth with low resistance to motion, and the third section has a fixed connection to the housing of the ground-boring device. Improved transmission of the advancing forces to the earth and consequently an improved advance of the ground-boring device can be achieved by at least two of the boring head sections being designed so as to be axially movable relative to one another in the longitudinal direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.