Cold-headed and roll-formed pick type cutter body with carbide insert
US4627665A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 4, 1985 |
| Grant date | Dec 9, 1986 |
| Priority date | — |
| Expiry date | Apr 4, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C35/1837
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pick type bit is disclosed with an improved socket for a carbide insert. The cutter body of the bit is cold-headed from a steel blank to provide a cylindrical shank and a conical head with a socket in the forward end. The cylindrical shank is roll-formed to provide a retaining groove and an intermediate section is roll-formed to provide an extraction groove between the head and the shank. The cold-heading includes an initial step of squaring-up the forward end of the blank by cold-heading it into cylindrical shape with a flat forward end and then punching the socket. This provides a socket of densified work-hardened steel. The bit is completed by brazing the base of a carbide insert in mating relation with the socket in the head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.