Патент USA US2130580код для вставки
' Sept. 20, 1938. J. BUCKLES Filed Sept. 26, \\\„ 2,130,580 Patented Sept. 20, 1938 2,130,58Ü UNITED STATESPATENT OFFICE 2,130,580 INSIDE PIPE CUTTER James Buckles, Goose Creek, Tex. _ Application September 26, 1935, Serial No. 42,171 3 Claims. 'I‘his invention relates to an inside pipe cutter. An object of the invention is to provide a pipe cutter shaped to be inserted into a pipe, stuck in a well bore, and adapted to cut by rotation. Another object of the invention is to provide a pipe cutter comprising a cutter body having outwardly movable blades mounted therein nor mally held in retracted position in combination with a mandrel movable axially through the 10 body arranged to engage and move the blades outwardly while the device is being rotated in the pipe to be cut. Another objectA is to provide a cutter of the character described wherein the mandrel is nor 15 mally held in inactive position by a yieldable spring or seat with means thereon for the ap plication of liquid under pressure thereto to actu ate the mandrel into Contact with the blades to move the blades outwardly into cutting relation 20 with the pipe to be cut. (o1. lei-_0.8) pivoted at their upper ends on the cross-pins 5 and their lower ends are provided with the out wardly directed bits 6. The blades are normally held retracted by the llat springs ‘l whose upper ends are fastened to the body and whose lower Ul ends press against the outer sides of the blades as shown in Figs. 4 and 5. Any desired number of blades may be employed, three, the preferable number, being shown. . Axially movable in the body l there is a mandrel 8 and surrounding this mandrel there is a strong coil spring 9 whose lower end is seated on the inside shoulder I0 of the body and whose upper end resists against the nut I I threaded on the upper end of the mandrel. This nut may be adjusted to regulate the tension on the spring 9. The upper end of the body is formed with the cylinder I2 and on the upper end of the man drel, fitting closely within this cylinder, there is a piston I3. The mandrel 8 has an axial channel I4 there A further feature resides in the provision of a pipe cutter of the character described wherein through from end to end. The inner sides of the mandrel constitutes also a weight suspended the blades 4, beneath the pins 5, are provided from, and having a swiveling connection with, with the downwardly converging bearing faces 25 a wire line whereby the mandrel'may be low I5, and the lower end of the mandrel B is tapered ered into position to actuate the blades outwardly to engage said faces and force the lower ends of into pipe-cutting position, or elevated. ` the blades outwardly upon downward movement With the above and other objects in view the of the mandrel. invention has particular relation to certain novel In operation the cutter is lowered into the well 30 features of construction, operation and arrange bore and into the pipe I6 stuck therein. Liquid ment of parts, examples of which are given in this under pressure is then forced down through the speciñcation and illustrated in the accompany stem 2 and against the piston I3 and the mandrel ing drawings, wherein: 8 will thereby be forced downwardly and will Fig. 1 shows a vertical sectional view oi the gradually move the blades 4 outwardly, carrying 35 cutter. the bits 6 into contact with the pipe to be cut. Fig. 2 shows a cross-sectional view taken on the Meanwhile, suiiicient liquid will pass through the line 2-2 of Fig. 1. channel I4 to flush the bits and to keep them Fig. 3 shows a cross-sectional view taken on cool during the cutting operation. When the pipe the line 3-3 of Fig. 1. I6 is severed, the liquid pressure may be released 4.0 Fig. 4 shows a vertical sectional view of an other form of the cutter, showing the blades in inactive position, and Fig. 5 shows a fragmentary side view, partly in section, of the form of cutter shown in Fig. 4, 45 with the blades in active position. Referring now more particularly to the draw ings wherein like numerals of reference desig nate similar parts in each of the figures, the numeral I designates a tubular cutter body 50 vadapted to be connected to the lower end of a tubular operating string 2 whereby the cutter may be rotated from the ground surface. At its lower end the cutter body is provided with the vertically elongated tubular slots 3 in 55 which the cutter blades 4 work. The blades are and a spring 9 will withdraw the mandrel up wardly allowing the springs 'I to retract the blades and the tool may then be withdrawn fromv the pipe. In actual practice a spear is usually carried by the operating string 2 so that when the cutting is completed, the cutting tool may be lowered and the spear engaged with the cut-01T section and said section removed with the cutter, or the cut ter may be withdrawn from the well, and a pipe puller lowered into engagement with the cut-ofi section, and said section removed preparatory to making another cut. In the form shown in Figs. 4 and 5, the man drel 8a is in the form of an elongated weight adapted to be let down through the cutter body ' 55 2,130,580 2 la to actuate the blades, as hereinabove ex plained. This weight, or mandrel 8a, may be let down and withdrawn through the instrumental ity of the cable Il which has a swiveling connec tion with the upper end of the mandrel 8a, as shown in Fig. 4. This swiveling connection is necessary so that during the rotation of the cut ter, the cable Il will not be twisted and injured. In this form there is suilicient clearance between the mandrel 8a and the body la, to permit liquid I to circulate down to the bits iorilushing them and keeping them cool. f v In other respects the form shown in Fig. 4 is the same as that shown in Fig. 1. The drawings and description disclose what is now considered to be preferred forms of the in vention by way of illustration only, while the ' broad principle of the invention will be defined 20 by the appended claims. VWhat I claim is: 1. A pipe cutter adapted to cut by rotation and comprising a tubular cutter body having an in side shoulder, outwardly movable blades whose 25 upper ends are pivoted to the body and whose lower ends are swingable outwardly and formed With outwardly directed bits, said blades having downwardly converging inside faces, means nor mally holding the blades retracted into inactive position, a mandrel movable axially in the body ~30 having an adjustable stop thereon, a coil spring on the shoulder and acting against the stop and normally holding the mandrel elevated into in active position, a piston on the mandrel above the stop and fitted in the body, a tubular op 35 erating string to the lower end oi which the body is attached and through which liquid under pres sure may be forced against the piston to move the mandrel downwardly against said faces to force the blades outwardly. 2. A pipe cutter adapted to out by rotation 40 and comprising a tubular body whose upper end is formed into a cylinder, said cylinder having an inside annular shoulder- at its lower end, out wardly movable blades whose upperY ends are 45 pivoted to the body and whose lower ends are swingable outwardly and formed with outwardly directed bits, the blades having downwardly con verging, inside faces, means normally holding the blades retracted into inactive position, a mandrel movable axially in the body and ex tended into the cylinder, an annular inside shoul der in the body spaced beneath the lower end of the cylinder, a coiled spring resting on said last mentioned shoulder and supporting the mandrel and normally holding it elevated into inactive position, means on the mandrel for regu lating the compression of said spring, a piston on the mandrel fitted within the cylinder and whose downward movement is limited by the first mentioned shoulder at the lower end of the cylinder, the lower end of the mandrel being positioned to operate against said faces to force 15 the blades outwardly upon downward movement of the mandrel. 3. A pipe cutter adapted to cut by rotation and comprising a tubular body whose upper end is ' formed into a cylinder, outwardly movable blades 20 whose upper ends are pivoted to the body and whose lower ends are swingable outwardly and formed with outwardly directed bits, the blades having downwardly converging, inside faces, means normally holding the blades retracted into 25. inactive position, a mandrel movable axially in the body and extended into the cylinder, said mandrel being tapered at its lower end to engage the converging inside faces of the blades, a shoul der in the lower end of the body, a coil spring 305. resting on the said shoulder, and supporting the mandrel and holdingthe mandrel normally in inactive position, threads on the upper end of the mandrel adapted to receive a nut for hold ing said coil spring adjustably in place, a piston 35 in the cylinder above said coil spring, an internal annular shoulder at the lower end of said cyl inder vfor restricting the downward movement of the piston, the upper end of the mandrel being reduced and externally threaded, a nut threaded onto said reduced end of the mandrel for locking the piston in place and a tubular op erating string above the piston for the passage of fluid under pressure to operate the mandrel downwardly. JAMES BUCKLES.