Patent US4093392A successfully refreshed from Google Patents.
US4093392A
Expired / Lapsed
US
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Milling cutter
Assignee: Valenite LLC
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Filing: 1975-04-10
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Granted: 1978-06-06
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Expires: 1995-04-10
Abstract
Abstract An indexable insert milling cutter having multiple round inserts located in staggered individual isolated pockets formed in the annular periphery of the cutter body. Each insert is trapped in its pocket with only a small fraction of the cutting edge projecting beyond the periphery of the body. A chip clearance wall extends outwardly from the cutting face of the insert to the periphery of the body.
Inventors
- 👤 David Alan Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:12
CPC Classifications
B; B23; B23C; B23C5/00; B23C5/16; B23C5/20; B23C5/22; B23C5/2204; B23C5/2208; B23C5/2213; B23C2200/00; B23C2200/04; B23C2200/045; B23C2200/36; B23C2200/361; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1906; Y10T407/1934; Y10T407/1936; Y10T407/1942; Y10T407/195; Y10T407/1952; Y10T407/1956; Y10T407/1958
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
157 words
An indexable insert milling cutter comprising an annular cylindrical body, a plurality of individual insert pockets formed in the cylindrical periphery of said body, each of said pockets having a seat for holding an insert with its cutting face in a substantially axial plane modified to the extent of any axial and radial rake angles which are the same for every insert, and a minor portion of its cutting edge projecting beyond said periphery, each pocket having a chip clearance wall associated therewith, said wall providing chip clearance space projecting from the entire cutting face to the periphery of said body, each pocket with its chip clearance wall being substantially isolated from every other pocket by surrounding cylindrical periphery of said body, and said insert pockets being uniformly spaced in overlapping cutting relationship in an axial direction and angularly spaced in a circumferential direction on a continuous helical path for progressive cutter entry in milling a workpiece.
Claim 2
Dependent Claim
157 words
An indexable insert milling cutter comprising an annular cylindrical body, a plurality of individual insert pockets formed in the cylindrical periphery of said body, each of said pockets having a seat for holding an insert with its cutting face in a substantially axial plane modified to the extent of any axial and radial rake angles which are the same for every insert, and a minor portion of its cutting edge projecting beyond said periphery, each pocket having a chip clearance wall associated therewith, said wall providing chip clearance space projecting from the entire cutting face to the periphery of said body, each pocket with its chip clearance wall being substantially isolated from every other pocket by surrounding cylindrical periphery of said body, and said insert pockets being uniformly spaced in overlapping cutting relationship in an axial direction and angularly spaced in a circumferential direction on a continuous helical path for progressive cutter entry in milling a workpiece.
Claim 3
Dependent Claim
25 words
A milling cutter as set forth in claim 1 wherein each of said pockets is formed with a wall to accommodate a round indexable insert.
Claim 4
Dependent Claim
31 words
A milling cutter as set forth in claim 2 wherein each pocket is formed to extend around more than one half of the insert located therein securing it against radial displacement.
Claim 5
Dependent Claim
41 words
A milling cutter as set forth in claim 3 wherein said pocket is positioned to locate the insert with its cutting edge projecting beyond the periphery of said annular body to an extent of 8 to 12% of the insert diameter.
Claim 6
Dependent Claim
37 words
A milling cutter as set forth in claim 2 wherein said chip clearance wall is enlarged relative to the cutting face of said insert to a level extending slightly below the cutting edge of said cutting face.
Claim 7
Dependent Claim
26 words
A milling cutter as set forth in claim 2 wherein said axial spacing is in a range of 1/4 th to 1/2 of the instant diameter.
Claim 8
Dependent Claim
23 words
A milling cutter as set forth in claim 2 wherein said axial spacing is in the order of 30% of the insert diameter.
Claim 9
Dependent Claim
24 words
A milling cutter as set forth in claim 1 wherein said insert pockets are located with uniform angular spacing on a single uniform helix.
Claim 10
Dependent Claim
22 words
A milling cutter as set forth in claim 8 wherein said angular spacing is in a preferred range of 94° to 98°.
Claim 11
Dependent Claim
36 words
A milling cutter as set forth in claim 8 wherein the angular spacing between the pockets for inserts successively entering cutting engagement with the work piece is equal to 360° divided by the number of pockets.
Claim 12
Dependent Claim
21 words
A milling cutter as set forth in claim 8 wherein a left hand helix is used on a right hand cutter.
Claim 13
Dependent Claim
31 words
A milling cutter as set forth in claim 2 wherein said annular body is a cylindrical end mill body and the endmost pocket is located radially inward of the other pockets.
Claim 14
Dependent Claim
41 words
A milling cutter as set forth in claim 2 wherein said annular body is a cylindrical end mill body and the endmost pocket is located radially inward of the other pockets, and with reduced axial spacing relative to the remaining pockets.
Claim 15
Dependent Claim
35 words
A milling cutter as set forth in claim 2 wherein the pocket is dimensioned to receive an insert having a diameter in the order of 1/4 th of the dia. of the annular cutter body.
Claim 16
Dependent Claim
55 words
A milling cutter as set forth in claim 1 including four equally axially spaced pockets, the first two pockets from the end being diametrically opposed and the next two pockets from the end being diametrically opposed and advanced angularly in the direction of cutting action in the order of 60° ahead of said first pair.
Claim 17
Dependent Claim
22 words
A milling cutter as set forth in claim 2 wherein each of said pockets is provided with a negative radial rake angle.
Claim 18
Dependent Claim
20 words
A milling cutter as set forth in claim 16 wherein each pocket is provided with a negative axial rake angle.
Claim 19
Dependent Claim
30 words
A milling cutter as set forth in claim 2 including round inserts, each of said inserts having relief at its inner end to avoid corner engagement with said round pocket.
Claim 20
Dependent Claim
18 words
A milling cutter as set forth in claim 1 including means for retaining said insert in its pocket.
Claim 21
Dependent Claim
48 words
A milling cutter as set forth in claim 1 including an apertured insert in said pocket wherein the bottom of each insert is conically relieved adjacent said aperture to assure positive seating and to avoid fracture inducing corner stresses and means for retaining said insert in its pocket.
Claim 22
Dependent Claim
64 words
A milling cutter as set forth in claim 1 including an apertured insert in said pocket wherein said aperture is countersunk to accommodate a screw head substantially flush with the cutting face of said insert, the bottom of said countersunk surface being conical with an included angle in the order of 120°, and a conical headed screw for retaining said insert in its pocket.
Claim 23
Dependent Claim
30 words
A milling cutter as set forth in claim 2, and a threaded hole being provided in said body seat offset from said round pocket wall in a radially inward direction.
Claim 24
Dependent Claim
42 words
A milling cutter as set forth in claim 2 including cylindrical inserts wherein a positive rake bevelled cutting edge is provided by bevelling inwardly the upper cylindrical end of said cylindrical insert except for a planar flat immediately adjacent the cutting edge.
Claim 25
Dependent Claim
53 words
A milling cutter as set forth in claim 2 wherein said annular body is cylindrical and the endmost pocket is located radially inward of the other pockets, and with reduced axial spacing relative to the remaining pockets, said cutter including an insert for said endmost pocket having a square configuration with rounded corners.
Claim 26
Dependent Claim
47 words
A milling cutter comprising an annular body constructed for mounting a plurality of individual cutting elements on its periphery, with a cutting edge of each element extending beyond the periphery, and on a continuous helical path, with equal angular spacing, within a range of 91° to 100°.
Claim 27
Dependent Claim
47 words
A milling cutter comprising an annular body constructed for mounting a plurality of individual cutting elements on its periphery, with a cutting edge of each element extending beyond the periphery, and on a continuous helical path, with equal angular spacing, within a range of 91° to 100°.
Claim 28
Dependent Claim
23 words
A milling cutter as set forth in claim 25 wherein said equal angular spacing is within a preferred range of 94° to 98°.
Claim 29
Dependent Claim
22 words
A milling cutter as set forth in claim 25 including cutting elements wherein said cutting edge extending beyond the periphery is rounded.
Claim 30
Dependent Claim
27 words
A milling cutter as set forth in claim 25 including individual pockets for each of said individual cutting elements surrounded by the periphery of said annular body.
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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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |