US4340324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting insert
Assignee: Kennametal Inc
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Filing: 1980-08-28
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Granted: 1982-07-20
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Expires: 2000-08-28
Abstract
Abstract A cutting insert for the metalworking industry is disclosed having a cutting edge, a land area, a descending wall and a sloping wall that joins a planar floor in the central portion of the insert. The cutting insert is polygonal when viewed in plan and has rounded corners joining the sides of the insert. The insert has at least two angularly related cutting edges defining a plane. The perpendicular distance between the plane defined by the cutting edges and the point where the descending wall joins the sloping floor is at a minimum in the corner areas and at a maximum intermediate the adjacent corners of the insert.
Inventors
- 👤 James F. McCreery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:19
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/22; B23B27/14; B23B27/141; B23B27/145; B23B2200/00; B23B2200/32; B23B2200/323; Y; Y10; Y10T; Y10T407/00; Y10T407/23; Y10T407/235
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
196 words
A cutting insert which comprises: a polygonal body having top and bottom faces and a peripheral wall with rounded corners joining said top and bottom faces; cutting edge means formed at the juncture of said peripheral wall and at least one of said top and bottom faces; said cutting edge means comprising at least two angularly related cutting edges defining a plane with said rounded corners joining said cutting edges to one another; a land area joining said cutting edge and extending inwardly of said polygonal body; a descending wall that extends away from, and is joined to said land area, forms a first acute included angle with the plane of said cutting edges and terminates in a sloping floor area that descends as said sloping floor extends inwardly of said body and forms a second acute included angle with said plane defined by said cutting edges, said first included angle being greater in said corner than in areas away from said corner, and the perpendicular distance from the plane of said cutting edges to the point where the descending wall joins the sloping floor being smallest in the corner and greatest intermediate the adjacent corners.
Claim 2
Dependent Claim
196 words
A cutting insert which comprises: a polygonal body having top and bottom faces and a peripheral wall with rounded corners joining said top and bottom faces; cutting edge means formed at the juncture of said peripheral wall and at least one of said top and bottom faces; said cutting edge means comprising at least two angularly related cutting edges defining a plane with said rounded corners joining said cutting edges to one another; a land area joining said cutting edge and extending inwardly of said polygonal body; a descending wall that extends away from, and is joined to said land area, forms a first acute included angle with the plane of said cutting edges and terminates in a sloping floor area that descends as said sloping floor extends inwardly of said body and forms a second acute included angle with said plane defined by said cutting edges, said first included angle being greater in said corner than in areas away from said corner, and the perpendicular distance from the plane of said cutting edges to the point where the descending wall joins the sloping floor being smallest in the corner and greatest intermediate the adjacent corners.
Claim 3
Dependent Claim
19 words
A cutting insert according to claim 1 wherein said second acute angle is smaller than said first acute angle.
Claim 4
Dependent Claim
30 words
A cutting insert according to claim 2 in which said first included angle is in the range of from 20 to 35 degrees in the corners of said polygonal body.
Claim 5
Dependent Claim
33 words
A cutting insert according to claim 2 in which said first included angle is 10 to 25 degrees in areas of the descending wall located away from said corners of said polygonal body.
Claim 6
Dependent Claim
35 words
A cutting insert according to claim 2 in which the perpendicular distance from the plane of the cutting edges to the plane of said planar floor is in the range of 0.008 to 0.030 inches.
Claim 7
Dependent Claim
42 words
A cutting insert according to claim 2 or 5 in which the perpendicular distance from the plane of said cutting edges to the point where the descending wall joins the sloping floor is in the range of from 0.003 to 0.030 inches.
Claim 8
Dependent Claim
38 words
A cutting insert according to claim 6 wherein in said corner area said perpendicular distance from the plane of said cutting edges to the point where the descending wall joins the sloping floor is 0.003 to 0.015 inches.
Claim 9
Dependent Claim
23 words
A cutting insert according to claim 2 wherein said descending wall meets said sloping floor along an arc-like line in said corner area.
Claim 10
Dependent Claim
35 words
A cutting insert according to claim 8 wherein said descending wall intermediate adjacent corners meets said sloping floor along a line which joins said arc-like line in said corner area in a substantially tangential manner.
Claim 11
Dependent Claim
38 words
A cutting insert according to claim 9 wherein said land area has a width within the range of 0.003 to 0.050 inches with the land width in the corners being narrower than the land width intermediate adjacent corners.
Claim 12
Dependent Claim
28 words
A cutting insert according to claim 2 wherein said sloping floor terminates in a planar floor that is substantially parallel to the plane defined by said cutting edges.
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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |