Pipe jack
US5048793A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1990 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Jun 14, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/086
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus is provided for handling a pipe to be used in a pipeline replacement operation or the like. The apparatus includes upper and lower semicircular pipe-gripping sections slidably received on a base and drive pistons connected to the lower pipe-gripping section for moving the pipe-gripping sections from a pipe-releasing position to a pipe-gripping position and then to extended positions in which the gripped pipe has been moved axially with respect to the base. The apparatus also includes a collar affixed to the base for receiving a pipe from the pipe-gripping sections. The collar includes offset cams movable between a first position allowing axial movement of the pipe in an axially forward direction and an axially rearward direction and a second position allowing movement only in the axially forward direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.