Patent US2705036A successfully refreshed from Google Patents.
US3786541A
Expired / Lapsed
US
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Cutting inserts having two-stage chipbreaker
Assignee: Sandvik AB
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Filing: 1972-10-18
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Granted: 1974-01-22
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Expires: 1992-10-18
Abstract
Abstract The invention relates to a cutting insert having chip-breakers in two stages, and is characterized in that the cutting edge and the associated chip-breaker describe a curve composed of straight and/or arched parts in the plane of the clearance- or side face.
Inventors
- 👤 E Lundgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:07
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/143; B23B2200/00; B23B2200/20; B23B2200/202; B23B2200/32; B23B2200/323; B23B2200/36; B23B2200/3645; B23B2200/3654; B23B2200/3663; Y; Y10; Y10T; Y10T407/00; Y10T407/23; Y10T407/24; Y10T407/245
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
Cutting insert having at least one insert corner with associated cutting edges provided with chip-breakers in the shape of grooves in the broad- or chip faces of the insert, said grooves extending along the cutting edges, the inner or back boundary of the chip-breaker connecting with a central region of the cutting insert, said chip-breaker being shaped with two steps, in which cutting insert the cutting edge with associated chip-breaker describes A compound line composed of concave portions adjacent the outer extremities of the cutting edge and an intermediate portion which is arched, said compound line being in the plane of the clearance or side face, the first chipbreaker step having constant width and depth in relation to the cutting edge, while the width and depth of the second chipbreaker step vary with the position of the cutting edge in relation to the central region.
Claim 2
Dependent Claim
145 words
Cutting insert having at least one insert corner with associated cutting edges provided with chip-breakers in the shape of grooves in the broad- or chip faces of the insert, said grooves extending along the cutting edges, the inner or back boundary of the chip-breaker connecting with a central region of the cutting insert, said chip-breaker being shaped with two steps, in which cutting insert the cutting edge with associated chip-breaker describes A compound line composed of concave portions adjacent the outer extremities of the cutting edge and an intermediate portion which is arched, said compound line being in the plane of the clearance or side face, the first chipbreaker step having constant width and depth in relation to the cutting edge, while the width and depth of the second chipbreaker step vary with the position of the cutting edge in relation to the central region.
Claim 3
Dependent Claim
32 words
Cutting insert according to claim 1, charcterized in that the cutting edge with connecting chip-breaker consists of concave parts next to the corner radii of the insert and an interjacent convex part.
Claim 4
Dependent Claim
30 words
Cutting insert according to claim 1, wherein the cutting edges with associated chip-breaker consists of concave parts next to the corner radii of the insert and an interjacent straight part.
Claim 5
Dependent Claim
16 words
Cutting insert according to claim 1, wherein the outer portion of the concave parts is straight.
Claim 6
Dependent Claim
22 words
Cutting insert according to claim 1, wherein the downward part of the cutting edge starts at some distance into the cutting edge.
Claim 7
Dependent Claim
31 words
Cutting edge according to claim 1, wherein the curve which describes the cutting edge with associated chip-breaker extends from the insert corner at least to the middle of the cutting insert.
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 |