Patent US4532697A successfully refreshed from Google Patents.
US3678718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe perforating machine
Assignee: Individual
•
Filing: 1970-12-04
•
Granted: 1972-07-25
•
Expires: 1990-12-04
Abstract
Abstract A machine for perforating a cylindrical pipe consisting of a frame operable to support said pipe between diametrically opposed pairs of shear blades carried by said frame and extending longitudinally of said pipe, a head carried by said frame for powered movement through said pipe parallel to the axis thereof, and a pair of cutter wheels carried rotatably by said head on axes transverse to said pipe and having rolling engagement with the interior of said pipe respectively in alignment with one of said pairs of shear blades, each of said wheels having a series of angularly spaced cutter teeth projecting radially outwardly therefrom by a distance greater than the wall thickness of said pipe, each of said teeth being operable, as said wheel rolls through said pipe, to cooperate with the associated shear blades to cut a pair of short parallel slits longitudinally in the pipe wall, and to offset outwardly the wall section between said slits.
Inventors
- 👤 William A Brown
- 👤 Eugene P Earnest
- 👤 W Wyatt Earp Bldg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:57
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; B21D28/28; B21D31/00; B21D31/02; B26; B26F; B26F1/00; B26F1/0015; B26F1/0038; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0596; Y10T83/384; Y10T83/392; Y10T83/395; Y10T83/398
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
156 words
A machine for perforating a cylindrical pipe comprising: a. a main frame, b. a straight shear blade carried rigidly by said frame, c. supporting means carried by said frame and operable to support said pipe against said shear blade, said blade extending longitudinally of said pipe and engaging the exterior surface thereof, d. a cutter head supported by said frame for movement through said pipe, e. a cutter wheel carried rotatably by said head on an axis transverse to said pipe and positioned to roll against the interior surface of said pipe in alignment with said shear blade as said head is moved through said pipe, f. a series of angularly spaced, radially projecting teeth carried fixedly by said cutter wheel, and g. power means carried by said frame and operable to move said cutter head through said pipe, whereby said teeth and said shear blade cooperate to form perforations in the wall of said pipe.
Claim 2
Dependent Claim
156 words
A machine for perforating a cylindrical pipe comprising: a. a main frame, b. a straight shear blade carried rigidly by said frame, c. supporting means carried by said frame and operable to support said pipe against said shear blade, said blade extending longitudinally of said pipe and engaging the exterior surface thereof, d. a cutter head supported by said frame for movement through said pipe, e. a cutter wheel carried rotatably by said head on an axis transverse to said pipe and positioned to roll against the interior surface of said pipe in alignment with said shear blade as said head is moved through said pipe, f. a series of angularly spaced, radially projecting teeth carried fixedly by said cutter wheel, and g. power means carried by said frame and operable to move said cutter head through said pipe, whereby said teeth and said shear blade cooperate to form perforations in the wall of said pipe.
Claim 3
Dependent Claim
105 words
A machine as recited in claim 1 including a pair of said shear blades arranged in closely spaced apart parallel relation and so positioned that both engage said pipe, and wherein each tooth of said cutter wheel cooperates with said shear blades to cut a pair of parallel slits in the wall of said pipe, and to offset the strip of the pipe wall intermediate said slits radially outwardly by a distance greater than the wall thickness of said pipe, whereby to open narrow rectangular openings between each longitudinal edge of said strip and the adjoining edge of the standing portion of the pipe wall.
Claim 4
Dependent Claim
126 words
A machine as recited in claim 2 wherein the operative edges of said shear blades are substantially square in cross-sectional contour and are spaced transversely apart by a distance corresponding to the transverse width of the teeth of said cutter wheel, said teeth being operable to cut through the pipe wall and enter between said shear blades as said cutter head is moved through said pipe, each of said teeth being substantially square in transverse cross-sectional contour, the major portion of its angular extent being arcuately concentric with said cutter wheel, and having its extreme angular end portions rounded about axes parallel to the rotative axis of said cutter wheel, the radius of curvature of said end portions being less than the radius of said wheel.
Claim 5
Dependent Claim
42 words
A machine as recited in claim 3 wherein the radial projectionof each of said teeth from said cutter wheel is generally equal to the wall thickness of said pipe, plus the radial width desired of said narrow rectangular openings to be formed.
Claim 6
Dependent Claim
49 words
A machine as recited in claim 4 with the addition of a spacer plate interposed between said shear blades with the face thereof confronting the opening netween said blades recessed below said opening by a distance generally equal to the radial projection of said teeth from said cutter wheel.
Claim 7
Dependent Claim
52 words
A machine as recited in claim 5 wherein the peripheral surface of said cutter wheel which engages the interior surface of said pipe is roughened directly adjacent the transverse sides of the teeth carried by said wheel, whereby to provide a positive non-slip rolling engagement of said wheel against said pipe wall.
Claim 8
Dependent Claim
86 words
A machine as recited in claim 2 with the addition of: a. a second pair of shear blades carried by said frame and operable to engage the exterior surface of said pipe along longitudinal lines diametrically opposite to said first pair of shear blades, and b. a second toothed cutter wheel carried rotatably by said cutter head and operable to roll along the interior surface of said pipe in cooperative relationship with said second pair of shear blades as said head is moved through saiD pipe.
Claim 9
Dependent Claim
131 words
A machine as recited in claim 7 wherein said main frame includes an elongated horizontal lower rail, said first pair of shear blades being fixed in the upper edge of said lower rail, and wherein said supporting means comprises; a. an auxiliary frame carried for vertical movement by said main frame, and including a horizontal upper rail disposed in aligned relation above said lower rail, said second pair of shear blades being fixed in the lower edge of said upper rail, and b. power elevating means carried by said main frame for raising and lowering said auxiliary frame with respect thereto, whereby said auxiliary frame may be lowered to grip said pipe between said first and second pairs of shear blades, and raised to free said pipe for insertion or removal.
Claim 10
Dependent Claim
77 words
A machine as recited in claim 8 with the addition of pipe support members carried by said auxiliary frame and spaced below said pipe when said pipe is gripped between said first and second pairs of shear blades, whereby as said auxiliary frame is raised, said second pair of shear blades are first lifted away from said pipe, and said pipe support members then engage and lift said pipe away from said first pair of shear blades.
Claim 11
Dependent Claim
57 words
A machine as recited in claim 9 wherein said pipe support members constitute roller wheels carried by said auxiliary frame for rotation on axes parallel to said shear blades, whereby when said pipe is supported only by said roller wheels, it may be rotated about its axis to index it angularly with respect to said shear blades.
Claim 12
Dependent Claim
68 words
A machine as recited in claim 8 wherein said power elevating means is operable to maintain a strong downward pressure on said auxiliary frame as said cutter head is moved through said pipe, whereby to prevent vertical spreading of said upper and lower rails, and with the addition of fixed stop members carried by said main frame and operable to limit the downward movement of said auxiliary frame.
Claim 13
Dependent Claim
93 words
A machine as recited in claim 11 wherein said cutter wheels are vertically spaced apart at such a distance as to perforate a pipe having a slightly smaller diameter than the pipe actually to be perforated, and wherein said power elevating means is operable to lower said auxiliary frame with sufficient force to flatten said pipe vertically between said shear blades, said stop members being positioned to arrest the downward movement of said auxiliary frame when the vertical dimension of said pipe has been reduced sufficiently to cooperate effectively with said cutter wheels.
Claim 14
Dependent Claim
132 words
A machine as recited in claim 8 wherein said main frame includes horizontally extending guideways intermediate said upper and lower rails, whereby to extend through said pipe parallel to the axis thereof, said cutter head being mounted slidably on said guideways, and with the addition of: a. a series of roller wheels carried by said main frame in longitudinally spaced relation therealong, and at either side thereof, and b. means carried by said main frame for selectively raising said roller wheels to a position wherein they support said pipe in spaced relation above said lower rail, said roller wheels being rotatable about horizontal axes transverse to said rails, whereby a pipe supported thereon may be moved longitudinally of itself into a position intermediate said upper and lower rails and encircling said guideways.
Claim 15
Dependent Claim
143 words
A machine as recited in claim 8 wherein said main frame includes: a. horizontally extending guideways intermediate said upper and lower rails, whereby to extend through said pipe parallel to the axis thereof, both said lower rail and said guideways being of such length as to extend outwardly from both ends of said pipe, b. a first post fixed at its lower end to said lower rail, at one end thereof, and at its upper end to said guideways, and c. a second post pivoted at its lower end to the opposite end of said lower rail, and releasably engaging, at its upper end, the opposite ends of said guideways in supporting relation tHereto, said second post being pivotal to a positon in which it leaves the adjacent ends of said guideways unobstructed for the longitudinal introduction of a pipe over said guideways.
Claim 16
Dependent Claim
95 words
A machine as recited in claim 14 with the addition of a cutter head carrier including guideways forming extensions of said first-named guideways at the ends thereof supported by said pivoted post, and operable to receive and support said cutter head, said cutter head being detachable from said means for moving it through said pipe along said guideways, said carrier being pivotally mounted on said main frame for movement to a position in which it leaves the adjacent ends of said first-named guideways unobstructed for the longitudinal introduction of a pipe over said first-named guideways.
Claim 17
Dependent Claim
128 words
A machine as recited in claim 8 wherein said means for moving said cutter head through said pipe comprises: a. tracks carried fixedly by said main frame and extending longitudinally from one end of said upper and lower rails, in parallel relation thereto, b. a carriage mounted for rolling movement along said rails, c. a substantially rigid beam affixed at one end to said carriage and extending horizontally between said upper and lower rails whereby it extends through said pipe, and attached at its opposite end to said cutter head, said beam being of such length as to extend through the full length of said pipe, and d. power means carried by said main frame and operable to drive said carriage selectively in either direction along said tracks.
Claim 18
Dependent Claim
60 words
A machine as recited in claim 16 wherein said cutter head, preparatory to movement thereof through said pipe to perforate said pipe, is disposed outwardly from the end of said pipe opposite to the end thereof at which said carriage is disposed, whereby said pipe is perforated as said cutter head is pulled, rather than pushed, therethrough by said beam.
References Cited (Backward Citations)
US3156285A
Cited
US3540258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |