Cutting tool for breaking hard material, and a cutting cap therefor
US6270165A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1999 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Oct 22, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C35/188
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotatable tool for breaking hard material includes an elongated tool body and a cutting cap mounted on the tool body. The cutting cap includes a generally conical front tip having a maximum first diameter (d), and a rear base portion having an outer peripheral surface defining a maximum second diameter (D). An intermediate portion extends from the tip to the base, and at least a part of the intermediate portion has a concave outer peripheral surface. A longitudinal extent (H) of the cap extends from a front end of the tip to a rear end of the outer peripheral surface of the base. A ratio of d to D is equal to or greater than 0.7. A ratio of H to D is equal to or greater than 1.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.