Cutter head for pit-boring machine
US4448269A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1981 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | Oct 27, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D1/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotatable cutter head for a pit boring machine used in reverse circulation drilling. The cutter head has cutter arrays including rotary cutters and drag cutters and disposed radially and circumferentially spaced positions on the cutter head, the drag cutters having the cutting ends lying generally in a conical plane having the axis coaxial with the axis of rotation of the cutter head. The rotary cutters each have cutting teeth around the circumference thereof and each tooth has an inclined side face lying in a further conical plane the central axis of which is coaxial with the axis of rotation of the rotary cutter, the inclined side face of each tooth facing generally along the inclination of the conical plane in which the cutting ends of the drag cutters lie, and the tip of each cutting tooth of each rotary cutter projecting beyond the plane in which the cutting ends of the drag cutters lie.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.