US4764255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cemented carbide tool
Assignee: Sandvik AB
•
Filing: 1987-03-13
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Granted: 1988-08-16
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Expires: 2007-03-13
Abstract
Abstract A tool or wear part comprises a cast iron or cast steel body (3) carrying one or more cast-in inserts (1). Each insert (1) comprises a cemented carbide cutting or wearing element partially embedded in the body (3), and an enclosure (2) completely surrounding the embedded portion of the element. The enclosure (2) is cast-in with respect to the body (3) and has a higher melting point than the body (3). The enclosure (2) is connected by a metallurgical bond to the body (3) and by a shrink-fit to the element.
Inventors
- 👤 Udo K. R. Fischer
- 👤 Erik T. Hartzell
- 👤 Mats G. Waldenstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:18
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/06; E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/62
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
Cemented carbide tool or wear part comprising a cast iron or cast steel body carrying a plurality of cast-in inserts, each said insert comprising: a cutting or wearing element of cemented carbide including an embedded portion extending into said body and a projecting portion extending beyond said body, and an enclosure cast-in with respect to said body and completely surrounding said embedded portion, said enclosure comprising a material having a higher melting point than said body and connected by a metallurgical bond to said body and by a shrink fit to said element.
Claim 2
Dependent Claim
93 words
Cemented carbide tool or wear part comprising a cast iron or cast steel body carrying a plurality of cast-in inserts, each said insert comprising: a cutting or wearing element of cemented carbide including an embedded portion extending into said body and a projecting portion extending beyond said body, and an enclosure cast-in with respect to said body and completely surrounding said embedded portion, said enclosure comprising a material having a higher melting point than said body and connected by a metallurgical bond to said body and by a shrink fit to said element.
Claim 3
Dependent Claim
40 words
Cemented carbide tool or wear part according to claim 1 in which the wall thickness of the enclosure is 0.5-10 mm and the melting point of the enclosure is more than 50° C. above the melting point of the body.
Claim 4
Dependent Claim
39 words
Cemented carbide tool or wear part according to claim 1 in which a surface of the body exposed to wear has thereon a layer with a thickness of less than 10 mm in which cemented carbide particles are dispersed.
Claim 5
Dependent Claim
34 words
Cemented carbide tool or wear part according to claim 1, wherein said tool or wear part comprises a rotary drill bit, said cutting or wearing element comprising a cutting button with a diamond layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |