Patent US3798723A successfully refreshed from Google Patents.
US3798723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting tool
Assignee: GORHAM TOOL CO
•
Filing: 1972-07-27
•
Granted: 1974-03-26
•
Expires: 1992-07-27
Abstract
Abstract A roughing milling cutter having a plurality of spiral flutes defining the leading edges of the cutting teeth. The cutting teeth are formed as a series of stepped serrations, the circumferentially adjacent stepped serrations defining a helix extending axially around the periphery of the cutter. The helix angle of the serrations is substantially greater than the helix angle of the flutes and each serration defines an axially inclined surface terminating in a shoulder and having both radial and axial clearance.
Inventors
- 👤 E Czopor
- 👤 S Mazur
- 👤 J Newton
- 👤 R Cochrane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:05
CPC Classifications
B; B23; B23C; B23C5/00; B23C5/02; B23C5/10; C; C01; C01F; C01F5/00; C01F5/02; C01F5/04; B23C2210/00; B23C2210/08; B23C2210/088; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1946; Y10T407/1952; Y10T407/1956; Y10T407/1958
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
231 words
A milling cutter comprising a generally cylindrical body having a plurality of axially extending spiral flutes spaced around its periphery and forming therebetween a plurality of axially extending spiral teeth, each tooth having a spirally extending leading cutting edge defined by the intersection of a front rake face and an outer peripheral curved surface, said outer peripheral surface having a plurality of axially adjacent, circumferentially extending radially stepped serrations therein, each of said serrations comprising an axially extending circumferentially curved surface which is inclined to the axis of the cutter at an angle of about 5*-10* and which terminates in a radially outer crest defined by a radially extending shoulder which is inclined to the axis of the cutter so that the included angle at said crest is at least slightly greater than 100*, said crests at said cutting edges all being equally spaced radially from the axis of the cutter, said outer peripheral faces being radially relieved inwardly from the cutting edge of each tooth to the trailing edge thereof and each of said shoulders being axially relieved from said cutting edge of each tooth to the trailing edge thereof, said serrations imparting to said cutting edge of each tooth a saw tooth configuration wherein the distance between the axially adjacent crests is about at least ten times the radial distance between said crests and the roots of said serrations.
Claim 2
Dependent Claim
231 words
A milling cutter comprising a generally cylindrical body having a plurality of axially extending spiral flutes spaced around its periphery and forming therebetween a plurality of axially extending spiral teeth, each tooth having a spirally extending leading cutting edge defined by the intersection of a front rake face and an outer peripheral curved surface, said outer peripheral surface having a plurality of axially adjacent, circumferentially extending radially stepped serrations therein, each of said serrations comprising an axially extending circumferentially curved surface which is inclined to the axis of the cutter at an angle of about 5*-10* and which terminates in a radially outer crest defined by a radially extending shoulder which is inclined to the axis of the cutter so that the included angle at said crest is at least slightly greater than 100*, said crests at said cutting edges all being equally spaced radially from the axis of the cutter, said outer peripheral faces being radially relieved inwardly from the cutting edge of each tooth to the trailing edge thereof and each of said shoulders being axially relieved from said cutting edge of each tooth to the trailing edge thereof, said serrations imparting to said cutting edge of each tooth a saw tooth configuration wherein the distance between the axially adjacent crests is about at least ten times the radial distance between said crests and the roots of said serrations.
Claim 3
Dependent Claim
29 words
A milling cutter as called for in claim 1 whereIn each of said shoulders is inclined to the radial plane of the cutter at an angle of about 30*.
Claim 4
Dependent Claim
32 words
A milling cutter as called for in claim 1 wherein the axially extending curved surface of each serration is inclined to the axis of the cutter at an angle of about 5*.
Claim 5
Dependent Claim
29 words
A milling cutter as called for in claim 3 wherein each of said shoulders is inclined to the radial plane of the cutter at an angle of about 30*.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |