Mechanical excavating machines including rotary cutter and suction tube
US3930324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1974 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | May 6, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F9/24
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mechanical hole digging machine comprising a rotary cutting tool and a suction tube having an inlet opening adjacent to the cutting tool, a suction device for applying suction to the tube remote from the inlet opening to cause material cut away by the cutting tool to be sucked inwards through the inlet opening, the cutting tool and part at least of the suction tube being carried on a mounting by which they are movable upwards and downwards. An electromagnetic metal detector comprising three coils is mounted near the cutter head and adapted in use to give an indication of the presence of buried metal service pipe during a hole digging operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.