US4520882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill head
Assignee: SKF Industrial Trading and Development Co BV
•
Filing: 1980-11-20
•
Granted: 1985-06-04
•
Expires: 2000-11-20
Abstract
Abstract A drill head having isostatically bonded therein the shank portions of hard, wear-resistant cutting elements. The drill head can include cutting elements of various shapes and contours. The varied shaped cutting elements result in additional resistance to forces encountered under operational conditions.
Inventors
- 👤 Hans B. van Nederveen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:54
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; E; E21; E21B; E21B10/00; E21B10/46; E21B10/50; E21B10/52; E21B10/56
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
In a drill head including a core and a plurality of hard wear-resistant cutting elements, the core comprising powder metal isostatically compacted in a compressible mold, and each of said cutting elements comprising a shank part having opposite ends with a cutting tip at one of said ends, a base part at the end of the shank part opposite from the cutting tip, said base part comprising a flange extending radially outward, said shank part and the base part being embedded in said core in a non-separable bond therewith, said shank part having a tapered shape becoming greater in the direction of said base part, said cutting element thereby fixedly positioned in said core in a manner inhibiting premature loosening of the cutting element from the core body, and said cutting tip extending from the exposed end of said shank part and projecting outward from the surface of said core part.
Claim 2
Dependent Claim
151 words
In a drill head including a core and a plurality of hard wear-resistant cutting elements, the core comprising powder metal isostatically compacted in a compressible mold, and each of said cutting elements comprising a shank part having opposite ends with a cutting tip at one of said ends, a base part at the end of the shank part opposite from the cutting tip, said base part comprising a flange extending radially outward, said shank part and the base part being embedded in said core in a non-separable bond therewith, said shank part having a tapered shape becoming greater in the direction of said base part, said cutting element thereby fixedly positioned in said core in a manner inhibiting premature loosening of the cutting element from the core body, and said cutting tip extending from the exposed end of said shank part and projecting outward from the surface of said core part.
Claim 3
Dependent Claim
40 words
A drill head according to claim 1 wherein each of said cutting elements has a central longitudinal axis, and a typical one of said cutting elements further comprising projection means extending transversely of said axis from said shank part thereof.
References Cited (Backward Citations)
US970002A
Cited
US3605923A
Cited
US4054449A
Cited
US3852874A
Cited
US3997011A
Cited
UST970002I4
Cited
US4098362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |