US3786540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting insert
Assignee: Sandvik AB
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Filing: 1972-10-17
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Granted: 1974-01-22
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Expires: 1992-10-17
Abstract
Abstract A cutting insert for use in the chip-forming machining of a metal work piece has at least one insert corner with one or more associated cutting edges provided with chip-breakers in the form of grooves in the broad sides of the cutting insert. According to the invention, the cutting edge is so formed that in the plane of the clearance or side face it describes a curve consisting of inward- or downward- directed parts from the insert corners and an interjacent outward- or upward turned part.
Inventors
- 👤 E Lundgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 22:37
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/143; B23B2200/00; B23B2200/20; B23B2200/202; Y; Y10; Y10T; Y10T407/00; Y10T407/23; Y10T407/235; Y10T407/24; Y10T407/245
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A cutting insert in the form of a regular polygon having parallel top and bottom faces and a peripheral surface extending between said faces, said peripheral surface comprising the sides of said regular polygon, sharp edges formed at the juncture of said faces and said sides, at least one of said faces having a chip controlling groove formed therein extending along and in contact with said edge, the width of said groove describing a compound curve such that the width varies along the length of said edge in such manner that the width of said groove at the midpoint of said edge is less than the width at points intermediate said midpoint and the ends of said edge.
Claim 2
Dependent Claim
118 words
A cutting insert in the form of a regular polygon having parallel top and bottom faces and a peripheral surface extending between said faces, said peripheral surface comprising the sides of said regular polygon, sharp edges formed at the juncture of said faces and said sides, at least one of said faces having a chip controlling groove formed therein extending along and in contact with said edge, the width of said groove describing a compound curve such that the width varies along the length of said edge in such manner that the width of said groove at the midpoint of said edge is less than the width at points intermediate said midpoint and the ends of said edge.
Claim 3
Dependent Claim
44 words
A cutting insert according to claim 1 in which the level of the cutting edge is determined by the width of said groove whereby as said width increases, the level of said cutting edge is lowered with respect to said face of said insert.
Claim 4
Dependent Claim
28 words
A cutting insert according to claim 2 in which the juncture of said groove and said side forms a straight line in a plane parallel to said face.
Claim 5
Dependent Claim
27 words
A cutting insert according to claim 2 in which the juncture of said groove and said side describes a compound curve in the plane of said side.
Claim 6
Dependent Claim
22 words
A cutting insert according to claim 1 in which said chip controlling groove extends in a closed path around said one face.
Claim 7
Dependent Claim
30 words
A cutting insert according to claim 1 in which said chip controlling groove is discontinuous so that there are portions of said edge to which said groove does not extend.
Claim 8
Dependent Claim
31 words
A cutting insert according to claim 6 in which said portions of said edge to which said groove does not extend are in the vicinity of the midpoint of said eDge.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |