US3863316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary cutting tool and method of manufacturing same
Assignee: Individual
•
Filing: 1973-12-07
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Granted: 1975-02-04
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Expires: 1993-12-07
Abstract
Abstract An improved rotary cutting tool suitable for cutting and finishing workpiece surfaces. This tool prevents the formation of ragged edges on workpieces which normally result from edge cutting operations. The tool prevents the formation of burrs normally made by routers by including a second cutting edge for cutting at an angle substantially perpendicular to the first cutting edge. A cut is made inwardly from each surface of the workpiece, that is, one set of cutting edges cuts toward the tool tip and another set of cutting edges cuts toward the shank, with the crossover point between the two cutting edges being located between the workpiece surfaces.
Inventors
- 👤 Herbert G Yeo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:40
CPC Classifications
B; B23; B23C; B23C5/00; B23C5/02; B23C5/10; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1946; Y10T407/1948; Y10T408/00; Y10T408/89; Y10T408/909; Y10T408/9095; Y10T408/9097
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
198 words
An improved rotary cutting tool comprising: a shank portion; and a fluted portion; said fluted portion having a first double helical cutting edge means beginning at said shank portion and extending forward around said fluted portion in one direction to a point adjacent to but short of the end of said fluted portion and comprising first double helical parallel cutting edges on lands spaced by first double helical parallel flutes; said fluted portion having a second double helical cutting edge means extending around said fluted portion in the other direction from the end of said fluted portion toward said shank portion to a point closer to said shank than is the forward termination of said first double helical cutting edge means and comprising second double helical parallel cutting edges on lands spaced by second double helical parallel flutes; whereby the rearward end of said second double helical cutting edge means longitudinally overlaps the forward end of said first double helical cutting edge means; the flute of each of said second double helical cutting edge means extending through one cutting edge land and at least into the next cutting edge land of said first double helical cutting edge means.
Claim 2
Dependent Claim
198 words
An improved rotary cutting tool comprising: a shank portion; and a fluted portion; said fluted portion having a first double helical cutting edge means beginning at said shank portion and extending forward around said fluted portion in one direction to a point adjacent to but short of the end of said fluted portion and comprising first double helical parallel cutting edges on lands spaced by first double helical parallel flutes; said fluted portion having a second double helical cutting edge means extending around said fluted portion in the other direction from the end of said fluted portion toward said shank portion to a point closer to said shank than is the forward termination of said first double helical cutting edge means and comprising second double helical parallel cutting edges on lands spaced by second double helical parallel flutes; whereby the rearward end of said second double helical cutting edge means longitudinally overlaps the forward end of said first double helical cutting edge means; the flute of each of said second double helical cutting edge means extending through one cutting edge land and at least into the next cutting edge land of said first double helical cutting edge means.
Claim 3
Dependent Claim
41 words
The tool of claim 1 wherein the forward end of said fluted portion is formed with end facing radially disposed third cutting edges, the end of said tool being convex and having a depressed apex on the axis of said tool.
Claim 4
Dependent Claim
36 words
The tool of claim 2 wherein said second double helical cutting edges terminate at the forward end of said tool at a point common with the radial outer termination point of said respective third cutting edges.
Claim 5
Dependent Claim
49 words
The tool of claim 1 wherein said first double helical cutting edges are arranged at a 45* left hand angle with respect to the axis of said tool and wherein said second double helical cutting edges are arranged at a 45* right hand angle with respect to said axis.
Claim 6
Independent Claim
92 words
A method of manufacturing a rotary cutting tool comprising the steps of: forming first double helical parallel flutes and lands extending from the shank of said tool toward the tip helically in one direction; forming second double helical parallel flutes and lands extending from the tip of said tool rearwardly in the opposite helical direction, said second double helical flutes passing through at least the first intersection with said first double helical lands; and forming a cutting edge on the right hand edges of both said first and second double helical lands.
Claim 7
Independent Claim
92 words
A method of manufacturing a rotary cutting tool comprising the steps of: forming first double helical parallel flutes and lands extending from the shank of said tool toward the tip helically in one direction; forming second double helical parallel flutes and lands extending from the tip of said tool rearwardly in the opposite helical direction, said second double helical flutes passing through at least the first intersection with said first double helical lands; and forming a cutting edge on the right hand edges of both said first and second double helical lands.
Claim 8
Dependent Claim
23 words
the method recited in claim 5 wherein said second double helical flutes extend through the second intersection with said first double helical lands.
References Cited (Backward Citations)
US2377329A
Cited
US3058199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |