US3875663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indexable cutting insert
Assignee: Seco Tools AB
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Filing: 1972-11-08
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Granted: 1975-04-08
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Expires: 1992-11-08
Abstract
Abstract An indexable insert for chip cutting machining has a chip breaking groove along each cutting edge on at least one broad face thereof. The inner edge of the chip breaking groove lies on a level with or ahead of (in the cutting direction) the cutting edge, and the broad face of the insert, inside of each cutting edge chip breaking groove, forms a substantially flat plane inclined downwardly from the groove edge towards the insert center, to thereby minimize the contact area between chip and insert, thereby reducing the transfer of heat from the chip to the insert and improving the service durability of the insert.
Inventors
- 👤 Manfred W Gustafson
- 👤 S Helge Wilback
- 👤 Rune Ljungqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/143; Y; Y10; Y10T; Y10T407/00; Y10T407/23; Y10T407/235
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A cutting insert of regular polygonal form having: broad top and bottom surfaces with interconnecting side faces; a cutting edge at the intersection of said side faces with at least one of said broad surfaces; and a chip breaker in the form of a groove provided for each said cutting edge, said chip breaker groove being in said at least one broad surface of the insert and extending longitudinally along the cutting edge between the cutting edge and the center of the insert; characterized in that: the central region of the insert being formed by and including a plurality of planar surfaces, each of which slopes downwardly toward the other of said broad surfaces from the inner edge of the chip breaker groove and extends to a central portion of the insert; and said planar surfaces extending between lines formed by the bisectors from the insert corners to the geometric center of the insert.
Claim 2
Dependent Claim
154 words
A cutting insert of regular polygonal form having: broad top and bottom surfaces with interconnecting side faces; a cutting edge at the intersection of said side faces with at least one of said broad surfaces; and a chip breaker in the form of a groove provided for each said cutting edge, said chip breaker groove being in said at least one broad surface of the insert and extending longitudinally along the cutting edge between the cutting edge and the center of the insert; characterized in that: the central region of the insert being formed by and including a plurality of planar surfaces, each of which slopes downwardly toward the other of said broad surfaces from the inner edge of the chip breaker groove and extends to a central portion of the insert; and said planar surfaces extending between lines formed by the bisectors from the insert corners to the geometric center of the insert.
Claim 3
Dependent Claim
31 words
Insert according to claim 1 characterized in that three of said downwardly sloping planar surfaces are formed in said central region and that said downwardly sloping planar surfaces form congruent triangles.
Claim 4
Dependent Claim
36 words
Insert according to claim 1, characterized in that a plurality of said downwardly sloping planar surfaces are formed in said central region and that said downwardly sloping planar surfaces form triangles which are congruent in pairs.
Claim 5
Dependent Claim
20 words
Insert according to claim 1 having a through hole extending through the center thereof and extending through said broad surfaces.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |