US3870431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutter for plastic pipe and drilling tool
Assignee: Mueller Co
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Filing: 1973-12-18
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Granted: 1975-03-11
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Expires: 1993-12-18
Abstract
Abstract A cutter member for use in cutting a hole in plastic pipe having a thick wall or a thin wall. The cutter member is rotated and advanced with a positive predetermined lead against the pipe, the cutter member being so designed that after it has cut the initial chips off the outside curvature of the pipe, it cuts a continuous chip by a peeling action and the initial chips and continuous chip are discharged inwardly of the cutter member above the coupon being cut. The cutter member may be repeatedly used and it can be used with a drilling tool or machine or, for that matter, a tapping tee. The preferable drilling machine for use with the cutter machine is of simple construction, including a tubular body member, a two-piece boring bar with one member having threads thereon for positively advancing the cutter member, and the other member of the boring bar being adapted to receive the cutter member. The drilling tool is detachably attached to a pipe or to a fitting operatively connected to the pipe, the fitting having the usual passageway therethrough and the boring bar being arranged to extend through the passageway to the wall of the pipe to be cut. The drilling tool is provided with means where the boring bar can be rapidly advanced to the cutting position or rapidly retracted after cutting and, further, the drilling tool is designed to prevent blow out of the boring bar when cutting pipes under pressure.
Inventors
- 👤 Lawrence F Luckenbill
- 👤 Daniel A Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:00
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/26; F16L47/34; F16L47/345; B; B23; B23B; B23B51/00; B23B51/04; B23B51/044; B23B2215/00; B23B2215/72; B23B2226/00; B23B2226/61; Y; Y10; Y10T; Y10T408/00; Y10T408/55; Y10T408/564; Y10T408/5647; Y10T408/68; Y10T408/89; Y10T408/895
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
368 words
A rotatable cutter member for cutting a hole in a plastic pipe by cutting a coupon when the cutter member is positively advanced against the pipe a predetermined distance per rotation of the same, said cutter member comprising a cylindrically shaped metal hollow body member having an outside wall surface and an inside wall surface and a wall thickness sufficient to resist distortion during cutting of the hole in the plastic pipe and having a cutting end portion with a flat end surface along a substantial portion thereof being normal to a longitudinal axis of the body member and a shank end portion for attachment to a tool, said body member further having at least one slot in said wall extending in a generally lengthwise direction from said flat end surface, said slot having a leading face and a trailing face, as defined by direction of rotation of the cutter member, a tooth of short arcuate extent projecting from the flat end surface of the body member, said tooth having an outside wall surface, an inside wall surface, and a face in the direction of rotation of the cutter member which are continuations of said outside wall surface and said inside wall surface of said body member and said trailing face of said slot, respectively, said tooth projecting from the flat end surface of said body member a predetermined length being at least as great as the predetermined distance of advancement per rotation whereby bearing between the flat end surface of the body member and the pipe is substantially eliminated to reduce torque and/or thrust loads, and said slot being positioned with at least one-half its width being located on one side of a diameter of said body with its trailing face parallel to a plane through the diameter so that said trailing face is inclined toward the interior of said body and an acute angle is formed at the exterior edge thereof, whereby said face of said tooth and said trailing face of said slot are oriented so that initial chips and then a continuous peeling chip are cut from the pipe, fed upwardly in the slot, and inwardly into the hollow body member above the coupon.
Claim 2
Dependent Claim
368 words
A rotatable cutter member for cutting a hole in a plastic pipe by cutting a coupon when the cutter member is positively advanced against the pipe a predetermined distance per rotation of the same, said cutter member comprising a cylindrically shaped metal hollow body member having an outside wall surface and an inside wall surface and a wall thickness sufficient to resist distortion during cutting of the hole in the plastic pipe and having a cutting end portion with a flat end surface along a substantial portion thereof being normal to a longitudinal axis of the body member and a shank end portion for attachment to a tool, said body member further having at least one slot in said wall extending in a generally lengthwise direction from said flat end surface, said slot having a leading face and a trailing face, as defined by direction of rotation of the cutter member, a tooth of short arcuate extent projecting from the flat end surface of the body member, said tooth having an outside wall surface, an inside wall surface, and a face in the direction of rotation of the cutter member which are continuations of said outside wall surface and said inside wall surface of said body member and said trailing face of said slot, respectively, said tooth projecting from the flat end surface of said body member a predetermined length being at least as great as the predetermined distance of advancement per rotation whereby bearing between the flat end surface of the body member and the pipe is substantially eliminated to reduce torque and/or thrust loads, and said slot being positioned with at least one-half its width being located on one side of a diameter of said body with its trailing face parallel to a plane through the diameter so that said trailing face is inclined toward the interior of said body and an acute angle is formed at the exterior edge thereof, whereby said face of said tooth and said trailing face of said slot are oriented so that initial chips and then a continuous peeling chip are cut from the pipe, fed upwardly in the slot, and inwardly into the hollow body member above the coupon.
Claim 3
Dependent Claim
368 words
A rotatable cutter member for cutting a hole in a plastic pipe by cutting a coupon when the cutter member is positively advanced against the pipe a predetermined distance per rotation of the same, said cutter member comprising a cylindrically shaped metal hollow body member having an outside wall surface and an inside wall surface and a wall thickness sufficient to resist distortion during cutting of the hole in the plastic pipe and having a cutting end portion with a flat end surface along a substantial portion thereof being normal to a longitudinal axis of the body member and a shank end portion for attachment to a tool, said body member further having at least one slot in said wall extending in a generally lengthwise direction from said flat end surface, said slot having a leading face and a trailing face, as defined by direction of rotation of the cutter member, a tooth of short arcuate extent projecting from the flat end surface of the body member, said tooth having an outside wall surface, an inside wall surface, and a face in the direction of rotation of the cutter member which are continuations of said outside wall surface and said inside wall surface of said body member and said trailing face of said slot, respectively, said tooth projecting from the flat end surface of said body member a predetermined length being at least as great as the predetermined distance of advancement per rotation whereby bearing between the flat end surface of the body member and the pipe is substantially eliminated to reduce torque and/or thrust loads, and said slot being positioned with at least one-half its width being located on one side of a diameter of said body with its trailing face parallel to a plane through the diameter so that said trailing face is inclined toward the interior of said body and an acute angle is formed at the exterior edge thereof, whereby said face of said tooth and said trailing face of said slot are oriented so that initial chips and then a continuous peeling chip are cut from the pipe, fed upwardly in the slot, and inwardly into the hollow body member above the coupon.
Claim 4
Dependent Claim
368 words
A rotatable cutter member for cutting a hole in a plastic pipe by cutting a coupon when the cutter member is positively advanced against the pipe a predetermined distance per rotation of the same, said cutter member comprising a cylindrically shaped metal hollow body member having an outside wall surface and an inside wall surface and a wall thickness sufficient to resist distortion during cutting of the hole in the plastic pipe and having a cutting end portion with a flat end surface along a substantial portion thereof being normal to a longitudinal axis of the body member and a shank end portion for attachment to a tool, said body member further having at least one slot in said wall extending in a generally lengthwise direction from said flat end surface, said slot having a leading face and a trailing face, as defined by direction of rotation of the cutter member, a tooth of short arcuate extent projecting from the flat end surface of the body member, said tooth having an outside wall surface, an inside wall surface, and a face in the direction of rotation of the cutter member which are continuations of said outside wall surface and said inside wall surface of said body member and said trailing face of said slot, respectively, said tooth projecting from the flat end surface of said body member a predetermined length being at least as great as the predetermined distance of advancement per rotation whereby bearing between the flat end surface of the body member and the pipe is substantially eliminated to reduce torque and/or thrust loads, and said slot being positioned with at least one-half its width being located on one side of a diameter of said body with its trailing face parallel to a plane through the diameter so that said trailing face is inclined toward the interior of said body and an acute angle is formed at the exterior edge thereof, whereby said face of said tooth and said trailing face of said slot are oriented so that initial chips and then a continuous peeling chip are cut from the pipe, fed upwardly in the slot, and inwardly into the hollow body member above the coupon.
Claim 5
Dependent Claim
34 words
A cutter member as claimed in claim 1 in which said leading face of said slot is parallel to said trailing face and is at least at or behind a plane through the diameter.
Claim 6
Dependent Claim
72 words
A cutter member as claimed in claim 1 in which said slot extends in the lengthwise direction at least a distance at least equal to a wall thickness of the pipe being cut, plus at least two times the projection of said tooth from the flat end surface of said body member whereby sufficient clearance is provided for chips to enter into the body member throughout the entire cutting of the coupon.
Claim 7
Dependent Claim
46 words
A cutter member as claimed in claim 1 in which the outside wall surface of said body member is smooth to reduce torque and wherein said inside wall surface of said body member is at least slightly rough to help in retaining the coupon when cut.
Claim 8
Dependent Claim
34 words
A cutter member as claimed in claim 1 in which said slot extends rearwardly in a direction of rotation at an angle to define a helical slot extending lengthwise from said flat end surface.
Claim 9
Dependent Claim
20 words
A cutter member as claimed in claim 5 in which said body member has its outside wall surface ground smooth.
Claim 10
Dependent Claim
21 words
A cutter member as claimed in claim 6 in which said helical slot has an angle in the order of 10*.
Claim 11
Dependent Claim
58 words
A cutter member as claimed in claim 1 in which the shank end portion of the body member is provided with a passageway therethrough communicating with the interior of the hollow body member whereby the coupon and the initial chips and the continuous peeling chip can be pushed out of the cutting end portion of the body member.
Claim 12
Dependent Claim
40 words
A cutter member as claimed in claim 1 in which the end of said tooth has a relief from its inside wall surface to its outside wall surface to prevent a flange from being formed on the coupon being cut.
Claim 13
Dependent Claim
18 words
A cutter member as claimed in claim 9 in which said relief is in the order of 15*.
Claim 14
Dependent Claim
24 words
A cutter member as claimed in claim 1 in which said shank end portion is provided with thread means for attaching to a tool.
Claim 15
Dependent Claim
24 words
A cutter member as claimed in claim 11 in which said body member is provided on its outside wall surface with oppositely disposed flats.
Claim 16
Independent Claim
384 words
An apparatus for cutting a hole in a plastic pipe comprising: a drilling tool adapted to be fixedly attached to the pipe, said drilling tool including a tubular body member, a boring bar extending completely through said tubular casing member, and means to rotate and positively advance said boring bar with a predetermined lead; and a cutter member detachably mounted to one end of said boring bar, said cutter member comprising a cylindrically shaped metal hollow body member having an outside wall surface and an inside wall surface and a wall thickness sufficient to resist distortion during cutting of the hole and having a cutting end portion with a flat surface along a substantial portion thereof normal to a longitudinal axis of the body member and a shank end portion for attachment to the boring bar, said hollow body member further having at least one slot therein extending from said flat end surface at a rearward angle relative to the direction of rotation, said slot having a leading face and a trailing face as defined by the direction of the rotation of the cutter member, a tooth of short arcuate extent projecting from the flat end surface of the body member, said tooth having an outside wall surface and an inside wall surface and a face in the direction of rotation which are continuations of said outside wall surface and said inside wall surface of the body member and said trailing face of said slot, respectively, said tooth projecting from the flat end surface of said body member a predetermined length being at least as great as the predetermined lead of said boring bar, and said slot being positioned with at least one-half of its width being located on one side of a diameter of said body member with its trailing face parallel to a plane through the diameter so that said trailing face is inclined toward the interior of said body and an acute angle is formed at the exterior edge thereof, whereby said face of said tooth and said trailing face of said slot are oriented so that initial chips and then a continuously peeling chip are cut from the pipe, fed upwardly in the slot between the coupon being cut, and then inwardly into the hollow body member above the coupon.
Claim 17
Independent Claim
384 words
An apparatus for cutting a hole in a plastic pipe comprising: a drilling tool adapted to be fixedly attached to the pipe, said drilling tool including a tubular body member, a boring bar extending completely through said tubular casing member, and means to rotate and positively advance said boring bar with a predetermined lead; and a cutter member detachably mounted to one end of said boring bar, said cutter member comprising a cylindrically shaped metal hollow body member having an outside wall surface and an inside wall surface and a wall thickness sufficient to resist distortion during cutting of the hole and having a cutting end portion with a flat surface along a substantial portion thereof normal to a longitudinal axis of the body member and a shank end portion for attachment to the boring bar, said hollow body member further having at least one slot therein extending from said flat end surface at a rearward angle relative to the direction of rotation, said slot having a leading face and a trailing face as defined by the direction of the rotation of the cutter member, a tooth of short arcuate extent projecting from the flat end surface of the body member, said tooth having an outside wall surface and an inside wall surface and a face in the direction of rotation which are continuations of said outside wall surface and said inside wall surface of the body member and said trailing face of said slot, respectively, said tooth projecting from the flat end surface of said body member a predetermined length being at least as great as the predetermined lead of said boring bar, and said slot being positioned with at least one-half of its width being located on one side of a diameter of said body member with its trailing face parallel to a plane through the diameter so that said trailing face is inclined toward the interior of said body and an acute angle is formed at the exterior edge thereof, whereby said face of said tooth and said trailing face of said slot are oriented so that initial chips and then a continuously peeling chip are cut from the pipe, fed upwardly in the slot between the coupon being cut, and then inwardly into the hollow body member above the coupon.
Claim 18
Dependent Claim
84 words
An apparatus as claimed in claim 13 in which said slot extends in a lengthwise direction of the body member of said cutter member at least a distance equal to a wall thickness of the pipe being cut, plus at least two times the projection of said tooth in a horizontal direction from the flat end surface of the body member whereby sufficient clearance is provided for the continuously peeling chip to enter into the body member through the entire cutting of the coupon.
Claim 19
Dependent Claim
46 words
An apparatus as claimed in claim 13 in which said body member has its outside wall surface ground smooth to reduce torque and in which said inside wall surface of said body member is at least slightly rough to help in retaining the coupon when cut.
Claim 20
Dependent Claim
24 words
An apparatus as claimed in claim 15 in which a dry film lubricant is coated on the outside wall surface of said body member.
Claim 21
Dependent Claim
15 words
An apparatus as claimed in claim 16 in which said dry film lubricant is teflon.
Claim 22
Dependent Claim
64 words
An apparatus as claimed in claim 13 in which said shank end portion is provided with a passageway therethrough communicating with the interior of the hollow body member whereby the coupon and the initial chips and the continuously peeling chip can be pushed out of the cutting end portion of the body member when the cutter member is detached from the said boring bar.
Claim 23
Dependent Claim
55 words
An apparatus as claimed in claim 13 in which said tooth has an end without tooth relief in an arcuate direction from the tooth face, said end of said tooth having a relief from its inside wall surface to its outside wall surface to prevent a flange from being formed on the coupon being cut.
Claim 24
Dependent Claim
23 words
An apparatus as claimed in claim 19 in which said relief on the end of said tooth is in the order of 15*.
Claim 25
Dependent Claim
101 words
An apparatus as claimed in claim 13 in which said boring bar includes a first elongated cylindrical member of predetermined diameter having one end adapted to attach to said cutter member and a second elongated threaded member of reduced diameter and detachably connected to said first member, and in which said tubular body member includes a bore of reduced diameter adjacent one end thereof which is less than the diameter of said first elongated member, but greater than the diameter of said second elongated member which extends therethrough whereby said boring bar cannot be blown out of said tubular body member.
Claim 26
Dependent Claim
83 words
An apparatus as claimed in claim 21 in which said means to rotate and positively advance said boring bar includes a disengagement nut threadedly received on the end of said tubular body member through which the second elongated member extends, said nut having a threaded bore therethrough for receiving said second threaded member of said boring bar, said disengagement nut being capable of removal from said tubular body member to provide a means for rapid boring bar advance and retraction during field use.
Claim 27
Dependent Claim
46 words
An apparatus as claimed in claim 22 in which said tubular body member has a second bore at its opposite end of a diameter through which said first elongated member of said boring bar extends, and sealing means between said second bore and said boring bar.
Claim 28
Dependent Claim
34 words
An apparatus as claimed in claim 23 in which said sealing means between said second bore and said boring bar includes an annular groove in said second bore and an O-ring in said groove.
Claim 29
Dependent Claim
31 words
An apparatus as claimed in claim 21 in which said first elongated member is detachably connected to said second elongated member of said boring bar by means of a roll pin.
Claim 30
Dependent Claim
51 words
An apparatus as claimed in claim 21 in which said first elongated member of said boring bar is provided for a threaded bore at its end to which said cutter member is attached and in which the shank end portion of the body member of said cutter member is exteriorly threaded.
Claim 31
Dependent Claim
38 words
An apparatus as claimed in claim 21 in which said second elongated threaded member is provided with handle means on its outer end, said handle means being a rachet wrench for rotating said boring bar in either direction.
Claim 32
Dependent Claim
45 words
A cutter member as claimed in claim 1 in which said slot has a width at least as wide as the wall thickness of said body member and/or said tooth, but less than three times the wall thickness of said body member and/or said tooth.
Claim 33
Dependent Claim
30 words
A cutter member as claimed in claim 1 in which said slot has a width in the order of twice the wall thickness of said body member and/or said tooth.
References Cited (Backward Citations)
US2287354A
Cited
US2978002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |