Patent US3781956A successfully refreshed from Google Patents.
US3781956A
Expired / Lapsed
US
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Cutting insert
Assignee: Kennametal Inc
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Filing: 1972-02-23
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Granted: 1974-01-01
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Expires: 1992-02-23
Abstract
Abstract A cutting insert, especially a molded cutting insert formed of a hard wear resistant material, such as a is super-chilled carbide. The insert comprises a body having parallel top and bottom faces and a peripheral wall and is polygonal when viewed perpendicular to the faces. Cutting edges are formed at the juncture of at least one of the faces and the peripheral wall and a recess is formed in the one face extending inwardly A heat the center and each recess is in the form of a skewed or helical plane to impart a shearing type cutting action to the insert when it is presented to a workpiece.
Inventors
- 👤 D Jones
- 👤 J Mccreery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:07
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/143; Y; Y10; Y10T; Y10T407/00; Y10T407/23; Y10T407/24; Y10T407/245
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
218 words
A cutting insert comprising: a body of hard wear resistant material having top and bottom faces in spaced parallel planes and a peripheral wall extending between said faces and perpendicular thereto, said faces being polygonal whereby said body has corners, cutting edge means at the juncture of said peripheral wall and at least one of said planes and extending from at least one corner of the insert toward a next adjacent corner thereof and disposed in its entirety in said one plane, and recess means extending longitudinally along said cutting edge means between the cutting edge means and the center of said body, said recess means when viewed in transverse cross section comprising an outer region adjacent the respective cutting edge means leading inwardly and downwardly in a direction away from said peripheral wall and an inner region remote from the respective cutting edge means and leading upwardly from the inner edge of said outer region to said one plane, said outer region when viewed in transverse cross section being disposed at an angle of inclination to said one plane which progressively changes in the same sense in the direction from one longitudinal end of said recess toward the other longitudinal end thereof whereby said outer region is substantially in the form of a skewed, or helical, plane.
Claim 2
Dependent Claim
218 words
A cutting insert comprising: a body of hard wear resistant material having top and bottom faces in spaced parallel planes and a peripheral wall extending between said faces and perpendicular thereto, said faces being polygonal whereby said body has corners, cutting edge means at the juncture of said peripheral wall and at least one of said planes and extending from at least one corner of the insert toward a next adjacent corner thereof and disposed in its entirety in said one plane, and recess means extending longitudinally along said cutting edge means between the cutting edge means and the center of said body, said recess means when viewed in transverse cross section comprising an outer region adjacent the respective cutting edge means leading inwardly and downwardly in a direction away from said peripheral wall and an inner region remote from the respective cutting edge means and leading upwardly from the inner edge of said outer region to said one plane, said outer region when viewed in transverse cross section being disposed at an angle of inclination to said one plane which progressively changes in the same sense in the direction from one longitudinal end of said recess toward the other longitudinal end thereof whereby said outer region is substantially in the form of a skewed, or helical, plane.
Claim 3
Dependent Claim
42 words
A cutting insert according to claim 1 in which the said change in the angle of inclination of said outer region of said recess means is in the positive sense when progressing from said one corner along the length of said recess.
Claim 4
Dependent Claim
42 words
A cutting insert according to claim 1 in which the said change in the angle of inclination of said outer region of said recess means is in the negative sense when progressing from said one corner along the length of said recess.
Claim 5
Dependent Claim
29 words
A cutting insert according to claim 1 in which the line of intersection of said inner region with said one plane is substantially parallel to said cutting edge means.
Claim 6
Dependent Claim
37 words
A cutting insert according to claim 1 in which said inner region is curved and blends with said outer region at the inner edge of the outer region while intersecting said one plane at a steep angle.
Claim 7
Dependent Claim
36 words
A cutting insert according tO claim 1 in which the outer edge of said outer region intersects said one plane adjacent said cutting edge means and forms a narrow land area along said cutting edge means.
Claim 8
Dependent Claim
45 words
A cutting insert according to claim 1 in which said cutting edge means comprises a cutting edge extending from each corner of the insert toward a next adjacent corner and said recess means comprises extending from each cutting edge toward the center of said body.
Claim 9
Dependent Claim
29 words
A cutting insert according to claim 1 in which at least said one corner of the insert when viewed in a direction perpendicular to said one plane is rounded.
Claim 10
Dependent Claim
26 words
A cutting insert according to claim 7 in which each corner of said insert when viewed in a direction perpendicular to said one plane is rounded.
Claim 11
Dependent Claim
28 words
A cutting insert according to claim 1 in which the included angle between said outer region and said peripheral wall varies upwardly from a minimum of about 75*.
Claim 12
Dependent Claim
44 words
A cutting insert according to claim 2 in which the included angle between said outer region and said peripheral wall varies from a maximum of about 90* near one end of said recess to a minimum of about 75* near the other end thereof.
References Cited (Backward Citations)
US3395434A
Cited
US3504413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |