US4273480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Throwaway tip
Assignee: Niterra Co Ltd
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Filing: 1978-10-16
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Granted: 1981-06-16
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Expires: 1998-10-16
Abstract
Abstract A throwaway tip for use in a lathe cutting tool. The tip has a cutting edge along the outer periphery and a succession of recesses are formed on the cutting surface. The recesses form a chip curling and cutting mechanism irrespective of the driving direction of the tip. The recesses may be of uniform diameter or preferably increase toward the center of the cutting edge line. The recesses may also be bevelled to facilitate entry and cutting of the chips.
Inventors
- 👤 Makoto Shirai
- 👤 Michinobu Ito
- 👤 Osamu Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:17
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/16; B23B27/1614; B23B27/1618; B23B2200/00; B23B2200/32; B23B2200/323; Y; Y10; Y10T; Y10T407/00; Y10T407/23; Y10T407/235
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
54 words
In a throwaway tip for use in a lathe cutting tool, having a cutting edge formed about the periphery of the tip and a chip breaker groove formed on a surface, the improvement comprising, said breaker groove formed by a plurality of generally spherical recesses disposed adjacent said cutting edge and contacting each other.
Claim 2
Dependent Claim
54 words
In a throwaway tip for use in a lathe cutting tool, having a cutting edge formed about the periphery of the tip and a chip breaker groove formed on a surface, the improvement comprising, said breaker groove formed by a plurality of generally spherical recesses disposed adjacent said cutting edge and contacting each other.
Claim 3
Dependent Claim
29 words
The tip of claim 1 wherein said recesses are formed with a predetermined radius of curvature whereby the radius of curvature defines an area of overlap between adjacent recesses.
Claim 4
Dependent Claim
40 words
The tip of claim 2 wherein said tip is generally triangular and said radius of curvature for each recess increases from apex portions of said tip to a central portion of said cutting edge for each side of the triangle.
Claim 5
Dependent Claim
20 words
The tip of claims 1 or 3 further comprising a surface inclined downwardly from the cutting edge to said recesses.
Claim 6
Dependent Claim
16 words
The tip of claims 1, 2, or 3 wherein said recesses are generally circular arcuate curves.
Claim 7
Dependent Claim
18 words
The tip of claim 5 further comprising a surface inclined downwardly from the cutting edge to said recesses.
Claim 8
Dependent Claim
17 words
The tip of claims 1, 2 or 3 wherein said recesses are formed as oval arcuate shapes.
Claim 9
Dependent Claim
16 words
The tip of claims 1, 2 or 3 wherein said recesses are formed as parabolic shapes.
Claim 10
Dependent Claim
65 words
In a throwaway generally triangular tip for use in a lathe cutting tool, having a cutting edge formed about the periphery of said tip and a chip breaker groove formed on a surface, the improvement comprising, said breaker groove formed by overlapping dimpled recesses extending about the circumference of said triangular tip, each of said recesses having an outer curved surface adjacent said cutting edge.
Claim 11
Dependent Claim
65 words
In a throwaway generally triangular tip for use in a lathe cutting tool, having a cutting edge formed about the periphery of said tip and a chip breaker groove formed on a surface, the improvement comprising, said breaker groove formed by overlapping dimpled recesses extending about the circumference of said triangular tip, each of said recesses having an outer curved surface adjacent said cutting edge.
Claim 12
Dependent Claim
40 words
The tip of claim 9, wherein said tip is generally triangular and said radius of curvature for each recess increases from apex portions of said tip to a central portion of said cutting edge for each side of the triangle.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |