US3765789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular hole cutter
Assignee: HOUGEN EVERETT
•
Filing: 1971-12-29
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Granted: 1973-10-16
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Expires: 1991-12-29
Abstract
Abstract An annular hole cutter having a plurality of teeth spaced circumferentially around the lower end thereof. Each cutting edge has a radially inner portion and a radially outer portion. The two portions of the cutting edges are preferably spaced apart vertically and circumferentially and disposed such as to form positive side rake angles relative to the inner and outer peripheries of the cutter. Each tooth has associated therewith an inner gullet and an outer gullet designed to permit the free passage of chips upwardly away from the two portions of the cutting edges.
Inventors
- 👤 E Hougen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:58
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; B23B51/0426; B23B2251/00; B23B2251/14; B23B2251/40; B23B2251/408; Y; Y10; Y10S; Y10S408/00; Y10S408/703; Y10T; Y10T407/00; Y10T407/19; Y10T407/1946; Y10T408/00; Y10T408/89; Y10T408/895; Y10T408/905; Y10T408/909; Y10T408/9095; Y10T408/9097
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
211 words
An annular hole cutter comprising a generally circular cylindrical side wall having a plurality of cutting teeth spaced around one end thereof and having means at the other end for mounting the cutter on a rotary driving member, each tooth having at least two generally radially extending cutting edges adapted to cut a circular groove when the cutter is rotated and fed axially into a workpiece, one of said cutting edges extending outwardly from the inner periphery of the cutter and another extending inwardly from the outer periphery of the cutter, all of said inner cutting edges being disposed at substantially the same height so as to penetrate into the material being cut to substantially the same depth and all of said outer cutting edges being disposed at substantially the same height so as to penetrate into the material being cut to substantially the same depth when the cutter is rotated and fed axially into a workpiece, whereby the cutting load is the same on all of the inner teeth and the cutting load is the same on all of the outer teeth, the inner cutting edge of each tooth being staggered circumferentially forwardly in the direction of rotation of the cutter relative to the outer cutting edge of each tooth.
Claim 2
Dependent Claim
211 words
An annular hole cutter comprising a generally circular cylindrical side wall having a plurality of cutting teeth spaced around one end thereof and having means at the other end for mounting the cutter on a rotary driving member, each tooth having at least two generally radially extending cutting edges adapted to cut a circular groove when the cutter is rotated and fed axially into a workpiece, one of said cutting edges extending outwardly from the inner periphery of the cutter and another extending inwardly from the outer periphery of the cutter, all of said inner cutting edges being disposed at substantially the same height so as to penetrate into the material being cut to substantially the same depth and all of said outer cutting edges being disposed at substantially the same height so as to penetrate into the material being cut to substantially the same depth when the cutter is rotated and fed axially into a workpiece, whereby the cutting load is the same on all of the inner teeth and the cutting load is the same on all of the outer teeth, the inner cutting edge of each tooth being staggered circumferentially forwardly in the direction of rotation of the cutter relative to the outer cutting edge of each tooth.
Claim 3
Dependent Claim
42 words
An annular hole cutter as called for in claim 1 wherein the radially outer end of each inner cutting edge is disposed below the radially adjacent portion of the outer cutting edge and above the lowest portion of the outer cutting edge.
Claim 4
Dependent Claim
42 words
An annular hole cutter as called for in claim 1 wherein the radially inner end of the outer cutting edge and the radially outer end of the inner cutting edge are connected by a shoulder portion extending axially of the side wall.
Claim 5
Dependent Claim
33 words
An annular hole cutter as called for in claim 2 wherein the lowest portion of the outer cutting edge is disposed radially intermediate the inner and outer ends of the outer cutting edge.
Claim 6
Dependent Claim
60 words
An annular hole cutter as called for in claim 1 wherein each of said inner cutting edges is radially inclined to form a positive side rake angle with the inner periphery of the side wall and each of said outer cutting edges is radially inclined to form a positive side rake angle with the outer periphery of the side wall.
Claim 7
Dependent Claim
57 words
An annular hole cutter as called for in claim 1 wherein each tooth is formed with a generally radially extending cutting edge intermediate said inner and outer cutting edges, the combined radial extents of the outer and intermediate cutting edges of each tooth being at least as great as the radial extent of the inner cutting edge.
Claim 8
Dependent Claim
102 words
An annular hole cutter as called for in claim 1 wherein the circumferential space between the cutting edges of each tooth and the trailing edge of the next successive forward tooth comprises radially inner and outer gullets, said inner gullet having a radially inner wall which tapers radially outwardly in an upward direction, said inner gullet opening outwardly into said outer gullet, said outer gullet extending from said Outer cutting edge upwardly beyond said inner gullet and beyond said teeth and being inclined rearwardly relative to the direction of rotation of the cutter with respect to the vertical axis of the cutter.
Claim 9
Dependent Claim
61 words
An annular hole cutter as called for in claim 7 wherein said outer gullet extends radially inwardly from the outer surface of said side wall to at least the circle defined by the outer end of said inner cutting edge, said outer gullet extending circumferentially rearwardly (relative to the direction of rotation) beyond the outer end of said inner cutting edge.
Claim 10
Dependent Claim
32 words
An annular hole cutter as called for in claim 7 wherein said outer gullet is inclined rearwardly relative to the axis of the cutter at an angle of about 20* to 45*.
Claim 11
Dependent Claim
39 words
An annular hole cutter as called for in claim 9 wherein the front rake face of each cutting edge is inclined rearwardly relative to the axis of the cutter at a lesser angle than the inclination of said gullets.
Claim 12
Dependent Claim
56 words
An annular hole cutter as called for in claim 8 wherein each of the inner cutting edges has a radial extent not greater than the radial extent of the outer cutting edges so that the chip cut by the inner cutting edge will have a width not greater than the radial extent of said outer gullet.
Claim 13
Dependent Claim
63 words
An annular hole cutter as called for in claim 7 wherein the front rake face of each inner cutting edge is disposed radially to form a positive side rake angle with the inner periphery of the cutter and the front rake face of the outer cutting edge is disposed to form a positive side rake angle with the outer periphery of the cutter.
Claim 14
Dependent Claim
22 words
An annular hole cutter as called for in claim 7 wherein said outer gullet increases in radial extent in an upward direction.
Claim 15
Dependent Claim
29 words
An annular hole cutter as called for in claim 7 wherein the radial extent of the outer gullet is as large as the radial extent of the inner gullet.
Claim 16
Dependent Claim
28 words
An annular hole cutter as called for in claim 7 wherein the circumferential extent of the outer gullet is greater than the circumferential extent of the inner gullet.
Claim 17
Dependent Claim
48 words
An annular hole cutter as called for in claim 7 wherein the leading face of the outer gullet is spaced forwardly of the leading face of the inner gullet and the trailing face of the outer gullet is spaced rearwardly of the trailing face of the inner gullet.
Claim 18
Dependent Claim
30 words
An annular hole cutter as called for in claim 7 wherein the circumferential extent of the outer gullet is about one and one-half times the thickness of said side wall.
Claim 19
Dependent Claim
54 words
An annular hole cutter as called for in claim 7 wherein each of said gullets has a trailing face, the trailing face of the outer gullet terminating at its lower end adjacent said outer cutting edge and the trailing face of the inner gullet terminating at its lower end adjacent said inner cutting edge.
Claim 20
Dependent Claim
33 words
An annular hole cutter as called for in claim 7 wherein the front rake angle of at least one of said cutting edges is less than the angular inclination of its respective gullet.
Claim 21
Dependent Claim
52 words
An annular hole cutter as called for in claim 7 wherein at least the radially inner portions of said inner cutting edges are inclined axially upwardly in a radially inward direction and at least the radially outer portions of said outer cutting edges are inclined axially upwardly in a radially outward direction.
Claim 22
Dependent Claim
42 words
An annular hole cutter as called for in claim 20 wherein the oppositely inclined cutting edge portions on each tooth intersect to define a crest on each tooth which is disposed radially intermediate the inner and outer peripheries of the side wall.
Claim 23
Dependent Claim
42 words
An annular hole cutter as called for in claim 7 wherein the bottom face of each tooth is defined by a back off face comprising a surface sloping axially upwardly in a radially inward direction across the full width of the tooth.
Claim 24
Dependent Claim
54 words
An annular hole cutter as called for in claim 7 wherein the bottom face of each tooth is defined by a back off face comprising two radially contiguous surfaces, the radially inner surface sloping aXially upwardly in a radially inward direction and the radially outer surface sloping axially upwardly in a radially outward direction.
Claim 25
Dependent Claim
35 words
An annular hole cutter as called for in claim 23 wherein said two surfaces of said back off face intersect to form a crest radially intermediate the inner and outer peripheries of the side wall.
Claim 26
Dependent Claim
24 words
An annular hole cutter as called for in claim 24 wherein said crest on each tooth intersects the outer cutting edge of the tooth.
Claim 27
Dependent Claim
34 words
An annular hole cutter as called for in claim 25 wherein the radially outer end of each inner cutting edge is disposed in a plane not more than about 0.010 inch above said crest.
Claim 28
Dependent Claim
35 words
An annular hole cutter as called for in claim 26 wherein the radially outer end of each outer cutting edge is disposed in a plane above the radially outer end of the inner cutting edge.
Claim 29
Dependent Claim
40 words
An annular hole cutter as called for in claim 24 wherein the front rake angle of each tooth at said crest is less than the front rake angle of said cutting edges at portions thereof spaced radially from said crest.
Claim 30
Dependent Claim
41 words
An annular hole cutter as called for in claim 7 wherein said cutter is of generally inverted cup shape and has a top wall, said outer gullets extending upwardly to at least the level of the bottom of said top wall.
Claim 31
Dependent Claim
31 words
An annular hole cutter as called for in claim 7 wherein said outer gullets extend the full height of said side wall and open axially upward at the upper end thereof.
Claim 32
Dependent Claim
41 words
An annular hole cutter as called for in claim 7 wherein the circumferential dimension of each outer gullet at a level above said teeth is at least as large as the combined radial extents of the cutting edges of each tooth.
Claim 33
Dependent Claim
38 words
An annular hole cutter as called for in claim 7 wherein the circumferential extent of each outer gullet at a level above said teeth is greater than the combined radial extents of the cutting edges of each tooth.
Claim 34
Dependent Claim
28 words
An annular hole cutter as called for in claim 7 wherein the inner and outer cutting edges of each tooth are connected by a curved cutting edge portion.
Claim 35
Dependent Claim
28 words
An annular hole cutter as called for in claim 7 wherein each outer gullet is provided with generally radially extending leading and trailing faces which are generally parallel.
Claim 36
Dependent Claim
25 words
An annular hole cutter as called for in claim 7 wherein the inner and outer cutting edges are staggered circumferentially at least about 0.025 inch.
Claim 37
Dependent Claim
148 words
An annular hole cutter comprising a generally circular cylindrical side wall having a plurality of cutting teeth spaced around one end thereof and having means at the other end for mounting the cutter on a rotary driving member, each tooth having a generally radially extending cutting edge at its lower end defined by a front rake face and a bottom back off face, each of said cutting edges having a radially inner portion and a radially outer portion, said two cutting edge portions being circumferentially staggered and when viewed in plan being inclined radially to each other such that the front rake face adjacent the inner cutting edge portion forms a positive side rake angle with the inner periphery of the side wall and the front rake face adjacent the outer cutting edge portion forms a positive side rake angle with the outer periphery of the side wall.
Claim 38
Dependent Claim
148 words
An annular hole cutter comprising a generally circular cylindrical side wall having a plurality of cutting teeth spaced around one end thereof and having means at the other end for mounting the cutter on a rotary driving member, each tooth having a generally radially extending cutting edge at its lower end defined by a front rake face and a bottom back off face, each of said cutting edges having a radially inner portion and a radially outer portion, said two cutting edge portions being circumferentially staggered and when viewed in plan being inclined radially to each other such that the front rake face adjacent the inner cutting edge portion forms a positive side rake angle with the inner periphery of the side wall and the front rake face adjacent the outer cutting edge portion forms a positive side rake angle with the outer periphery of the side wall.
Claim 39
Dependent Claim
26 words
An annular hole cutter as called for in claim 36 wherein the outer cutting edge portion is staggered circumferentially rearwardly of the inner cutting edge portion.
Claim 40
Dependent Claim
37 words
An annular hole cutter as called for in claim 37 including a shoulder extending circumferentially between the radially inner end of the outer cutting edge portion and the radially outer end of the inner cutting edge portion.
Claim 41
Dependent Claim
29 words
An annular hole cutter as called for in claim 7 wherein the height of the day light area of the inner gullet is not greater than about 0.040 inch.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |