Raise drill bit inboard cutter assembly
US4359114A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1980 |
| Grant date | Nov 16, 1982 |
| Priority date | — |
| Expiry date | Dec 10, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/28
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A raise bit (10) is constructed with a plurality of housings (30) secured to cutter carrier frame (14) and disposed about drive stem (12). Housings (30) include a rectangularly-shaped mounting box (48) for rotatably supporting an outboard roller cutter (28). Each housing (30) also includes an upright wall (34) having an upwardly tapered lug (40) extending along the upper edge portion thereof for seating within a correspondingly shaped groove (82) formed along the underside of shoulder section (78) of an L-shaped hanger bracket (68). A roller shell (72) is antifrictionally mounted on a spindle (70) extending outwardly from an upright section (76) of hanger bracket (68). Bracket (68) is held in hooked relationship over lug (40) by a pair of capscrews (74) extending downwardly through clearance holes formed in upright section (76) and engaging within a lower portion of upright wall (34).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.