Self-propelled ram boring machine
US5010965A · kind A · utility
82Cited by
6References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1990 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Apr 4, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/0232
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a self-propelled ram boring machine, in particular for making earth bores, having a striking tool at the leading end of a cylindrical housing, a striking piston movable to subject said striking tool to ramming blows, said striking piston being driven with pulsating, translatory working strokes, the striking tool is mounted in the housing to rotate about the axis of rotation and comprises kinematic means cooperating with the housing to change a translatory movement following each blow of said striking piston into a gradual rotary movement, and pneumatically operable means for initiating or interrupting the rotary movement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.