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US4003433A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for cutting pipe

Assignee: Individual
•
Filing: 1975-05-12
•
Granted: 1977-01-18
•
Expires: 1995-05-12
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Abstract

Abstract Method of cutting pipe using a pipe cutter including annular, axially aligned, gear, grip and cutter sections and a central shaft within the sections. The shaft is geared to the gear section for rotation in response to axial upward movement of the shaft relative to the gear section. The grip section carries pivoted jaws which are cammed outwardly by an enlarged diameter portion of the shaft in response to axial upward movement of the shaft relative to the gear, grip and cutter sections. The cutter section is journalled to the lower end of the grip section and carries a plurality of pivoted cutting blades movable laterally outwardly into engagement with the inner wall of the pipe casing in response to axial upward movement of the shaft. The cutter section is also splined to the shaft for rotation therewith. A cylinder is carried at the upper end of the gear section and the upper end of the shaft carries a piston in the cylinder. Upward movement of the piston within the cylinder by ignition of a power charge cams the jaws laterally outwardly to grip the interior pipe wall and causes rotation of the shaft relative to the gear section. Upward movement of the shaft also cams the cutting blades laterally outwardly and rotates such blades to cut the pipe. At the end of the upward stroke of the shaft, a reduced diameter shaft portion backs the jaws enabling such jaws to pivot laterally inwardly to release the cutter from the pipe wall. The lower end of the shaft is also located above the cutter blades enabling the blades to retract within the cutter section.

Inventors

  • 👤 Mack Goins

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 23:16
CPC Classifications
E; E21; E21B; E21B29/00

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 164 words
A method for cutting a pipe internally comprising: providing a pipe cutter including an elongated sleeve having a lower, rotatable section and an upper, enclosed, cylinder section housing a piston, said sleeve carrying movable gripping jaws at the central portion thereof, and a cutting tool at the lower rotatable section, said sleeve also carrying a shaft axially movable therein, the upper end thereof coupled to said piston; disposing said pipe cutter within a pipe to be cut; displacing said shaft in an axial direction relative to said sleeve by displacing said piston within said cylinder; displacing said gripping jaws and said cutting tool outwardly laterally in response to axial movement of said shaft to grip the interior pipe wall and engage said wall, respectively, as said piston is displaced within said cylinder; and rotating the lower section of said sleeve and said cutting tool relative to the upper portion of said sleeve in response to axial displacement of said shaft to cut said pipe.
Claim 2
Independent Claim 164 words
A method for cutting a pipe internally comprising: providing a pipe cutter including an elongated sleeve having a lower, rotatable section and an upper, enclosed, cylinder section housing a piston, said sleeve carrying movable gripping jaws at the central portion thereof, and a cutting tool at the lower rotatable section, said sleeve also carrying a shaft axially movable therein, the upper end thereof coupled to said piston; disposing said pipe cutter within a pipe to be cut; displacing said shaft in an axial direction relative to said sleeve by displacing said piston within said cylinder; displacing said gripping jaws and said cutting tool outwardly laterally in response to axial movement of said shaft to grip the interior pipe wall and engage said wall, respectively, as said piston is displaced within said cylinder; and rotating the lower section of said sleeve and said cutting tool relative to the upper portion of said sleeve in response to axial displacement of said shaft to cut said pipe.
Claim 3
Dependent Claim 27 words
A method according to claim 1 including continuously displacing said cutting tool laterally outwardly in response to continued axial displacement of said shaft in said one direction.
Claim 4
Dependent Claim 40 words
A method according to claim 1 wherein the steps of displacing said gripping jaws and displacing said cutting tool are effected in response to axial displacement of said shaft in one direction and on the same stroke of said piston.
Claim 5
Dependent Claim 24 words
The method according to claim 1 including retracting said jaws and cutting tool, laterally, inwardly, in response to continued axial movement of said shaft.
Claim 6
Independent Claim 129 words
A method for cutting a pipe internally utilizing a pipe cutter including an elongated sleeve carrying gripping jaws and a cutting tool and a shaft axially movable within said sleeve comprising the steps of: disposing said pipe cutter within the pipe to be cut; displacing said shaft in one axial direction relative to said sleeve; displacing said jaws laterally outwardly in response to axial movement of said shaft in said one direction to grip the interior pipe wall; displacing said cutting tool laterally outwardly in response to axial movement of said shaft in said one direction to engage the interior wall of said pipe; rotating said cutting tool about said axis in response to axial displacement of said shaft in said one axial direction to cut the pipe; and
Claim 7
Independent Claim 129 words
A method for cutting a pipe internally utilizing a pipe cutter including an elongated sleeve carrying gripping jaws and a cutting tool and a shaft axially movable within said sleeve comprising the steps of: disposing said pipe cutter within the pipe to be cut; displacing said shaft in one axial direction relative to said sleeve; displacing said jaws laterally outwardly in response to axial movement of said shaft in said one direction to grip the interior pipe wall; displacing said cutting tool laterally outwardly in response to axial movement of said shaft in said one direction to engage the interior wall of said pipe; rotating said cutting tool about said axis in response to axial displacement of said shaft in said one axial direction to cut the pipe; and
Claim 8
Dependent Claim 22 words
retracting said jaws and said cutting tool laterally, inwardly, in response to continued displacement of said shaft in said one axial direction.
Claim 9
Dependent Claim 22 words
retracting said jaws and said cutting tool laterally, inwardly, in response to continued displacement of said shaft in said one axial direction.
Claim 10
Dependent Claim 31 words
The method of claim 5 including continuously displacing said cutting tool laterally outwardly in response to continued axial displacement of said shaft in said one direction until said pipe is cut.
Claim 11
Dependent Claim 37 words
The method of claim 5 wherein the steps of displacing said jaws and displacing said cutting tool are effected in response to axial displacement of said shaft in said one direction and on the same stroke thereof.

References Cited (Backward Citations)

US935467A Cited
US1104492A Cited
US1460894A Cited
US1643709A Cited
US1756128A Cited
US2188409A Cited
US2622679A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-01-18 1980-07-19 1981-01-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-01-18 1984-07-19 1985-01-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-01-18 1988-07-19 1989-01-18 $7700.00 Window Closed / Lapsed

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