Butterfly-type shim having semi-opened bottom and double sandwich braze joint produced therewith
US4817743A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1987 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | Mar 12, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/58
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Formation of a double sandwich braze joint between the steel body of a bit and a carbide insert tip disposed in a groove formed across the body is facilitated by a butterfly-type shim having a semiopened bottom placed within the groove between surfaces on the bit body defining the groove and adjacent surfaces on the insert tip. The shim has a pair of upstanding spaced side walls and a pair of spaced bottom webs extending between and interconnecting the side walls so as to dispose them between adjacent side surfaces of the bit body groove and insert tip, with lower edges of the shim side walls disposed generally above the bottom webs. The bottom webs rest on the bottom surface of the bit body groove and, in turn, elevate the shim side walls so that their lower edges are spaced above the groove bottom surface. The bottom webs also support the insert tip in spaced relation above the groove bottom surface so as to define a gap which extends across and above the groove bottom surface, below the insert tip bottom surface and the shim side wall lower edges, and between the opposite side surfaces of the bit body groove. The gap will allow relatively unrestricted molten braze alloy flow acr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.