Patent US3881837A successfully refreshed from Google Patents.
US3881837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed steel metal cutting tool with integral working surfaces substantially free of carbide particles
Assignee: Robert Bosch Tool Corp
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Filing: 1973-03-06
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Granted: 1975-05-06
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Expires: 1993-03-06
Abstract
Abstract The subject invention relates to high speed steel metal cutting tools generally, and discloses as a specific embodiment of the invention a twist drill of high speed steel of known physical form. The distinctive qualities of the tool are (1) the improved character of the surfaces of the cutting and chip forming and directing surfaces of the tool and (2) the increased ability to clear the chip in the case of a restricted chip passageway such as the flutes of a twist drill, reamer, tap, or like tool with a restricted chip directing passage.
Inventors
- 👤 Thomas A Novosel
- 👤 Donald O Erskine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:51
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/02; B; B23; B23B; B23B51/00; B23B51/02; B23B2222/00; B23B2222/32; Y; Y10; Y10S; Y10S76/00; Y10S76/11; Y10T; Y10T408/00; Y10T408/78
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A METAL CUTTING TOOL HAVING A BODY COMPOSED OF HIGH SPEED TOOL STEEL COMPRISING CARBIDE PARTICLES OF MINUTE SIZE DISPERSED THROUGH SAID BODY, SAID BODY HAVING WORKING SURFACE PORTIONS COMPRISING A CUTTING EDGE PORTION AND AN INTEGRAL CHIP-RAISING SURFACE PORTION EXTENDING FROM THE CUTTING EDGE PORTION, SAID CUTTING EDGE PORTION BEING ADAPTED TO SEVER A CHIP FROM A METAL WORKPIECE, AND THE CHIP-RAISING SURFACE PORTION BEING ADAPTED TO RAISE THE SEVERED CHIP FROM THE WORKPIECE, SAID CUTTING EDGE PORTION AND SAID CHIP-RAISING SURFACE PORTION BOTH BEING PARTS OF THE BODY OFF THE TOOL AND CONTAINING DISTRIBUTED CARBIDE PARTICLES AND HAVING THEIR ABOVESAID WORKING SURFACE PORTIONS SUBSTANTIALLY FREE OF EXPOSED CARBIDE PARTICLES.
Claim 2
Dependent Claim
111 words
A METAL CUTTING TOOL HAVING A BODY COMPOSED OF HIGH SPEED TOOL STEEL COMPRISING CARBIDE PARTICLES OF MINUTE SIZE DISPERSED THROUGH SAID BODY, SAID BODY HAVING WORKING SURFACE PORTIONS COMPRISING A CUTTING EDGE PORTION AND AN INTEGRAL CHIP-RAISING SURFACE PORTION EXTENDING FROM THE CUTTING EDGE PORTION, SAID CUTTING EDGE PORTION BEING ADAPTED TO SEVER A CHIP FROM A METAL WORKPIECE, AND THE CHIP-RAISING SURFACE PORTION BEING ADAPTED TO RAISE THE SEVERED CHIP FROM THE WORKPIECE, SAID CUTTING EDGE PORTION AND SAID CHIP-RAISING SURFACE PORTION BOTH BEING PARTS OF THE BODY OFF THE TOOL AND CONTAINING DISTRIBUTED CARBIDE PARTICLES AND HAVING THEIR ABOVESAID WORKING SURFACE PORTIONS SUBSTANTIALLY FREE OF EXPOSED CARBIDE PARTICLES.
Claim 3
Dependent Claim
83 words
A twist drill comprising a substantially cylindrical body with longitudinally extending spiral flutes separated by a web and terminating at the working end in approximately conical cutting lips joined by a chisel edge, the entire body being formed of high speed steel which contains minute carbide particles distributed throughout said body below the surface of the same, said carbide particles being separated from the cutting and chip-engaging surfaces by an integral layer of high speed steel which is substantially free of carbide particles.
Claim 4
Dependent Claim
83 words
A twist drill comprising a substantially cylindrical body with longitudinally extending spiral flutes separated by a web and terminating at the working end in approximately conical cutting lips joined by a chisel edge, the entire body being formed of high speed steel which contains minute carbide particles distributed throughout said body below the surface of the same, said carbide particles being separated from the cutting and chip-engaging surfaces by an integral layer of high speed steel which is substantially free of carbide particles.
Claim 5
Dependent Claim
70 words
A twist drill comprising a generally cylindrical body of high speed steel provided with helical flutes, with a web between them, and terminating in cutting lips and a point, said drill comprising a body of high speed steel alloy of iron, carbon, and carbide-forming metals, said body containing minute carbide particles distributed throughout the body with an inTegral surface layer of steel from which carbide particles have been substantially eliminated.
Claim 6
Dependent Claim
70 words
A twist drill comprising a generally cylindrical body of high speed steel provided with helical flutes, with a web between them, and terminating in cutting lips and a point, said drill comprising a body of high speed steel alloy of iron, carbon, and carbide-forming metals, said body containing minute carbide particles distributed throughout the body with an inTegral surface layer of steel from which carbide particles have been substantially eliminated.
Claim 7
Dependent Claim
18 words
The twist drill of claim 2 wherein the body of high speed steel is of the molybdenum type.
Claim 8
Dependent Claim
18 words
The twist drill of claim 2 wherein the body of high speed steel is of the tungsten type.
References Cited (Backward Citations)
US1803875A
Cited
US2698810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |