Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1975-05-12
1977-01-18
Purser, Ernest R.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
166 558, E21B 2900
Patent
active
040034330
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.
REFERENCES:
patent: 935467 (1909-09-01), Cushing
patent: 1104492 (1914-07-01), Greve
patent: 1460894 (1923-07-01), Dix
patent: 1643709 (1927-09-01), Fawcett
patent: 1756128 (1930-04-01), Monroe
patent: 2188409 (1940-01-01), Lane
patent: 2622679 (1952-12-01), Ransom
Favreau Richard E.
Purser Ernest R.
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