US4560308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting tool
Assignee: GREENFIELD INDUSTRIES Inc A CORP OF DE
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Filing: 1984-08-13
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Granted: 1985-12-24
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Expires: 2004-08-13
Abstract
Abstract A rotary cutting tool of the type comprising an elongated cylindrical body having a central axis about which it is rotated for performing cutting or material removal operations during relative movement in directions perpendicular to its axis of rotation. The body includes a shank end portion and a cutting end portion. The cutting end portion includes a plurality of generally continuous cutting edges lying at a uniform radial distance from the axis and extending in generally parallel helical paths about the body. Each of the cutting edges is preferably of generally sinusoidal configuration along its respective helical path with spaced portions of each edge having alternating positive and negative radial rake.
Inventors
- 👤 David L. Deller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:54
CPC Classifications
B; B23; B23C; B23C5/00; B23C5/02; B23C5/10; B23C2210/00; B23C2210/08; B23C2210/088; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1946; Y10T407/1952; Y10T407/1962; Y10T407/1964; Y10T407/1966
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
69 words
In an end mill of the type comprising an elongated generally cylindrical body having a central axis, a shank, and a cutting end including a plurality of generally helically extending cutting edges located a uniform radial distance from said central axis the improvement wherein at least one of said cutting edges has a generally sinusoidal configuration and a cutting face with alternating portions of positive and negative radial rake.
Claim 2
Dependent Claim
69 words
In an end mill of the type comprising an elongated generally cylindrical body having a central axis, a shank, and a cutting end including a plurality of generally helically extending cutting edges located a uniform radial distance from said central axis the improvement wherein at least one of said cutting edges has a generally sinusoidal configuration and a cutting face with alternating portions of positive and negative radial rake.
Claim 3
Dependent Claim
25 words
The improvement as defined in claim 1 wherein said at least one cutting edge has a continuous generally sinusoidal configuration of alternate peaks and valleys.
Claim 4
Dependent Claim
35 words
The improvement as defined in claim 2 wherein said portions of negative radial rake are located at the peaks and said portions of positive radial rake are located at the valleys of said sinusoidal configuration.
Claim 5
Dependent Claim
48 words
The improvement as defined in claim 1 wherein all of said cutting edges have a generally sinusoidal configuration of alternate peaks and valleys with the portions of negative radial rake being located generally at said peaks and said portions of positive radial rake being located at said valleys.
Claim 6
Dependent Claim
33 words
The improvement as defined in claim 4 wherein said negative radial rake is in the range of up to 7° and said positive radial rake is in the range of up to 25°.
Claim 7
Dependent Claim
61 words
In an end mill of the type comprising an elongated generally cylindrical body having a central axis, a shank, and a cutting end including at least one helically extending cutting edge substantially all portions of which lay a uniform radial distance from said central axis the improvement wherein said cutting edge includes alternating spaced portions of positive and negative radial rake.
Claim 8
Dependent Claim
61 words
In an end mill of the type comprising an elongated generally cylindrical body having a central axis, a shank, and a cutting end including at least one helically extending cutting edge substantially all portions of which lay a uniform radial distance from said central axis the improvement wherein said cutting edge includes alternating spaced portions of positive and negative radial rake.
Claim 9
Dependent Claim
16 words
The improvement of claim 6 wherein said cutting edge is comprised of alternating peaks and valleys.
Claim 10
Dependent Claim
17 words
The improvement of claim 7 wherein said portions of negative radial rake are located on said peaks.
Claim 11
Dependent Claim
15 words
The improvement of claim 7 wherein said peaks and valleys have a generally sinusoidal shape.
Claim 12
Dependent Claim
24 words
The improvement of claim 9 wherein said peaks are spaced apart a distance in the range of 30-70% times the diameter of said body.
Claim 13
Dependent Claim
26 words
The improvement of claim 9 wherein the circumferential distance between said peaks and valleys is in the range of 1-20% of the diameter of said body.
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) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |