Pushing or pulling apparatus for pipe, rod or the like
US4000879A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1974 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | Oct 23, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus for pushing or pulling a pipe, rod or the like through subterranean areas, such as beneath sidewalks, roadways, etc. It is lowered into a pit and braced against opposing walls thereof by jacking out an extensible frame. Once positioned within the pit, a motor and pump unit supplies hydraulic fluid under pressure to a hydraulic cylinder which reciprocates through a lever arm a gripping means slidably mounted on the frame. When moved in one direction, the gripping means grips the pipe or rod while when moved in the other direction it disengages from the pipe or rod. The pipe or rod is thereby driven longitudinally into the ground. To pull the pipe or rod, the gripping direction of the gripping means is reversed by shifting the gripping member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.