Patent US4159885A successfully refreshed from Google Patents.
US4159885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting tool
Assignee: Individual
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Filing: 1977-07-05
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Granted: 1979-07-03
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Expires: 1997-07-05
Abstract
Abstract A cutting tool, preferably in the form of a cutting insert of hard material, having a narrow land area or ledge along the cutting edge, and a top surface recessed below the ledge, the recess being deep enough to cause a continuous chip cut from a workpiece by the cutting edge to naturally flow into the recess without interference such as to promote the formation of a false cutting tip build-up during use of the cutting tool, the cutting tip build-up resulting from the transfer of material from the chip to the ledge surface. The invention further contemplates favoring the formation of cutting tip build-up by forming the ledge with a concave section and, in addition or in the alternative, by providing a plurality of diamond particles embedded in the ledge surface at least at the cutting tip of the tool.
Inventors
- 👤 Lawrence A. Schott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:00
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; B23B27/141; B23B27/143; B23B2200/00; B23B2200/08; B23B2200/085; B23B2200/20; B23B2200/201; B23B2226/00; B23B2226/31; B23B2228/00; B23B2228/10; Y; Y10; Y10T; Y10T407/00; Y10T407/23; Y10T407/235; Y10T407/24; Y10T407/245; Y10T407/26
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
147 words
A cutting tool for removing chips from a workpiece comprising a plate of a single hard material having a bottom surface, a top surface and a peripheral surface whereby said peripheral surface and at least said top surface form a cutting edge at their junction, a recess in at least said top surface, said recess having an edge extending proximate said cutting edge and forming a perimetric ledge of substantially constant width extending radially from said cutting edge to said recess edge, and said recess being of a depth sufficient to cause a continuous chip to flow from said cutting edge into said recess and said perimetric ledge being in the form of a shallow groove such as to promote the formation of a false cutting tip build-up during use of said cutting tool, said perimetric ledge providing an anchoring surface for said false cutting tip build-up.
Claim 2
Dependent Claim
147 words
A cutting tool for removing chips from a workpiece comprising a plate of a single hard material having a bottom surface, a top surface and a peripheral surface whereby said peripheral surface and at least said top surface form a cutting edge at their junction, a recess in at least said top surface, said recess having an edge extending proximate said cutting edge and forming a perimetric ledge of substantially constant width extending radially from said cutting edge to said recess edge, and said recess being of a depth sufficient to cause a continuous chip to flow from said cutting edge into said recess and said perimetric ledge being in the form of a shallow groove such as to promote the formation of a false cutting tip build-up during use of said cutting tool, said perimetric ledge providing an anchoring surface for said false cutting tip build-up.
Claim 3
Dependent Claim
18 words
The cutting tool of claim 1 wherein both said top and bottom surfaces are provided with said recess.
Claim 4
Dependent Claim
17 words
The cutting tool of claim 1 wherein said perimetric ledge is in the form of a V-groove.
Claim 5
Dependent Claim
15 words
The cutting tool of claim 1 wherein said perimetric ledge is curvilinear in radial section.
Claim 6
Dependent Claim
32 words
The cutting tool of claim 1 wherein at least the surface of said perimetric ledge at the cutting tip of said tool has a plurality of diamond particles embedded in said surface.
Claim 7
Dependent Claim
32 words
The cutting tool of claim 3 wherein at least the surface of said perimetric ledge at the cutting tip of said tool has a plurality of diamond particles embedded in said surface.
Claim 8
Dependent Claim
32 words
The cutting tool of claim 4 wherein at least the surface of said perimetric ledge at the cutting tip of said tool has a plurality of diamond particles embedded in said surface.
Claim 9
Dependent Claim
15 words
The cutting tool of claim 1 wherein said recess is at least 0.25 mm deep.
Claim 10
Dependent Claim
15 words
The cutting tool of claim 2 wherein said recess is at least 0.25 mm deep.
Claim 11
Dependent Claim
19 words
The cutting tool of claim 8 wherein said recess is in the range of 1 to 2 mm deep.
Claim 12
Dependent Claim
19 words
The cutting tool of claim 9 wherein said recess is in the range of 1 to 2 mm deep.
Claim 13
Dependent Claim
148 words
A cutting tool for removing chips from a workpiece comprising a plate of a single hard material having a bottom surface, a top surface and a peripheral surface whereby said peripheral surface and at least said top surface form a cutting edge at their junction, a recess in at least said top surface, said recess having an edge extending proximate said cutting edge and forming a flat perimetric ledge of substantially constant width extending radially from said cutting edge to said recess edge, and said recess being of a depth sufficient to cause a continuous chip to flow from said cutting edge into said recess, said flat perimetric ledge having a roughened surface such as to promote the formation of a false cutting tip build-up during use of said cutting tool, said roughened surface of said perimetric ledge providing an anchoring surface for said false cutting tip build-up.
Claim 14
Dependent Claim
148 words
A cutting tool for removing chips from a workpiece comprising a plate of a single hard material having a bottom surface, a top surface and a peripheral surface whereby said peripheral surface and at least said top surface form a cutting edge at their junction, a recess in at least said top surface, said recess having an edge extending proximate said cutting edge and forming a flat perimetric ledge of substantially constant width extending radially from said cutting edge to said recess edge, and said recess being of a depth sufficient to cause a continuous chip to flow from said cutting edge into said recess, said flat perimetric ledge having a roughened surface such as to promote the formation of a false cutting tip build-up during use of said cutting tool, said roughened surface of said perimetric ledge providing an anchoring surface for said false cutting tip build-up.
Claim 15
Dependent Claim
18 words
The cutting tool of claim 12 wherein both said top and bottom surfaces are provided with said recess.
Claim 16
Dependent Claim
26 words
The cutting tool of claim 12 wherein said perimetric ledge and said peripheral surface are mutually disposed at said cutting edge at a substantially 90° angle.
Claim 17
Dependent Claim
25 words
The cutting tool of claim 12 wherein said perimetric ledge and said peripheral surface are disposed at an angle comprised substantially between 90° and 110°.
Claim 18
Dependent Claim
12 words
The cutting tool of claim 12 wherein said perimetric ledge is flat.
Claim 19
Dependent Claim
17 words
The cutting tool of claim 12 wherein said perimetric ledge is in the form of a V-groove.
Claim 20
Dependent Claim
15 words
The cutting tool of claim 12 wherein said perimetric ledge is curvilinear in radial section.
Claim 21
Dependent Claim
32 words
The cutting tool of claim 12 wherein at least the surface of said perimetric ledge at the cutting tip of said tool has a plurality of diamond particles embedded in said surface.
Claim 22
Dependent Claim
32 words
The cutting tool of claim 14 wherein at least the surface of said perimetric ledge at the cutting tip of said tool has a plurality of diamond particles embedded in said surface.
Claim 23
Dependent Claim
32 words
The cutting tool of claim 15 wherein at least the surface of said perimetric ledge at the cutting tip of said tool has a plurality of diamond particles embedded in said surface.
Claim 24
Dependent Claim
32 words
The cutting tool of claim 16 wherein at least the surface of said perimetric ledge at the cutting tip of said tool has a plurality of diamond particles embedded in said surface.
Claim 25
Dependent Claim
32 words
The cutting tool of claim 17 wherein at least the surface of said perimetric ledge at the cutting tip of said tool has a plurality of diamond particles embedded in said surface.
Claim 26
Dependent Claim
32 words
The cutting tool of claim 18 wherein at least the surface of said perimetric ledge at the cutting tip of said tool has a plurality of diamond particles embedded in said surface.
Claim 27
Dependent Claim
15 words
The cutting tool of claim 12 wherein said recess is at least 0.25 mm deep.
Claim 28
Dependent Claim
15 words
The cutting tool of claim 13 wherein said recess is at least 0.25 mm deep.
Claim 29
Dependent Claim
19 words
The cutting tool of claim 25 wherein said recess is in the range of 1 to 2 mm deep.
Claim 30
Dependent Claim
19 words
The cutting tool of claim 26 wherein said recess is in the range of 1 to 2 mm deep.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |