US1983488A - Reamer - Google Patents

Description

Dec. 4, 1934.

III

I T. PEDIGO REAMER Filed Feb. 28, 1934 2 Sheets-Sheet l Dec. 4, 1934. T. PEDIGO 1,933,488

r REAMER Filed Feb. 28, 1934 2 Sheets-SheetQ Patented Dec. 4, 1934 FFIC s era REAMER Luther T. Pedigo, Greensburg, Kans.

Application February 28, 1934, SerialNo. 713,363

5 7 Claims. (01. 255-76) This invention relates to well-drilling matral rib or stop lug 7, the sides of the body being chinery. open, as shown at 8, whereby circulation of "Inmany localities, the ground formationsare water or other fluid around the working parts is such that it is impossible todrill wells to the facilitated and, consequently, lubrication of the 5 required depth without first running in thewell parts is effected. At its lower end, the body is casing to shut off caving formations. Very often p d With a p d O We l CIOSS there are formations encountered which are hard Web or rib 9 which is disposed centrally between and impervious and prevent the casing from the sides of the body and serves as a guardto passing on down the holewhich has been drilled resist and mi m e t cce s o foreign matte! 10 by a, bit that i small enough to pass through to the intermeshing teeth on the cutters, and 6 the casing. When such formations are encounalso as a stop to limit e ward m vement Of tered, the h l b 1 the casing ,i enlarged the cutters, all of which will be readily underby the use of what is known as an under-reamer, stood upon re e e ce o the drawi and the present invention relates particularly Ah adjusting C eW y is mounted in the to the construction of the under-reamer, the pp end Of the ody a d has its shank ex- 70 object being to provide a reamer of novel contended through the ope 5, s c a y wn, struction whereby a simple durable device will a 100k nut 11 being fitted -1 the pp 8 be provided comprising few parts and eliminattremity 0f the Shank and Seating W n a eing a large amount of machining which is neccess 12 Provided therefor in the upper nd f essary in manufacturing 'reamers heretofore the P joint 3, as ShOWII- A 0011 Spring 13 ha 75 known. The invention is illustrated in the ac- One end engaged in the y 14 Of this SCIeW y companying drawings and will be hereinafter and itS Opposite end engaged in e pp e d fully described, the novel features being particuof a V-Sheped bowed leaf Spring S ea larly defined in the claims following the descrip- Spring having its Side members d v g d wnn wardly and equipped at their lower ends with 0 In the drawings, eyes or hooks adapted to engage around pins Figure 1 a View, partly in elevation and 16 inserted transversely through the upper ends partly in vertical section, of a reamer embodying of the cuttel'e- The Cutters consist of a Su the present invention stantially cylindrical main portion or body 17 Figure 2 is an edge elevationof the Same. having an opening 18 therethrough to receive 8 Figure 3 is an enlarged detail section showa joumel P 19, the ends of Which are received ing the Cutters swung inwardly into the posi 1n openlngs 20 in the opposite side walls of the tion assumed when the r'eamer is being passed body, said openings being located at the corners of the body at opposite sides of the central verdown or drawn up through the casing.

Figure 4 is a detail elevation of a portion tlcal plane of the body. Onthe1r opposed sides, 9 f the reamer head or body the cutter bodies 17 are formed with gear teeth Figure 5 is ahorizontal section on the line 21 Whlch mtermesh as Clearly Shown n Figof Figure 1. I ures land 3, so that the movement of the cut- Figure 6 15a perspective View of one of the ters will besimultaneous and equal at all times,

Cutters removed and 1t may be noted that there is no strain upon these interrneshing gear teeth, all the In the drawings, the reference numeral 1 instrain being carried by the journals 19 on meat-{es portmn of Casmg which has been their upper sides, the cutter bodies 17 are formed set-1 F partly'dnued W811 The numem1 with, spaced lugs 22 which receive-the 'ends of 5 2 Indicate? of my lmprmfed' the pins 16 so that the ends of the bowed spring reanfler 1s pmvlded at its upper end with 15 will be attached to the cutters and will cona P 301m 3 for attachment the regular stantly urge the cutters toward the expanded drilling stem. The body or head 2 1s constructed operating position shown in Figure Connect internally with a chamber or recess 4, the side mg the lugs 22 is a Web 23 which terminates 50 Walls of which diverge downwardly as clearly short of the outer surfaces of the respective win Figure 1, and from the upper Of lugs to form, when the webs of the two cutters Whic an Op 5 eXtendS through the upper come together, cooperating recesses in the sides e rem ty 0f t d- Spaced below t reof the cutters which will fit around the ribs or cess or chamber 4, on each side wall of the stop lugs 7 on the body, as shown in Figure 5,

55 body, is a shoulder 6 from which depends a cenand thereby prevent the cutters swinging out- 1 1,0

wardly to an excessive degree. The cutting edges or blades 24 project beyond the sides of the respective bodies 17, as will be understood upon reference to Figures 2 and 5, and they are made convex so as to fit readily within the casing or pipe 1, as will be understood. The blades extend from the undersides of the respective bodies 1'7, as shown clearly in Figures 1 and 6, and at the junction of the blades and the bodies, in the outer sides thereof, are recesses 25 in which are mounted rollers 25 adapted to engage and roll upon the inner surface of the pipe or casing 1, when the reamer is being drawn upwardly or lowered through the pipe, as will be understood. As shown most clearly in Figure 5, the peripheries of the rollers are made convex so that "they will conform to the concavity of the pipe and thereby facilitate the passage of the reamer therethrough.

The body 2 is provided, on its opposite sides, with vertically extending ribs 27 which will serve to reinforce the body and permit the Weight of the same to be minimized, and also will serve as guides to maintain the reamer properly centered within the pipe when being moved therethrough.

It will be understood from the foregoing description, taken in connection with the accompanying drawings, that the spring arms 15 constantly urge the lugs 22 and their connecting webs 23 toward each other so that the cutting edges or blades will swing outwardly beyond the sides of the body 2 to the position shown in Figure 1, to cut through the earth formation which has been encountered and through which the pipe cannot readily pass. The tension of the spring arms 15 will be regulated by adjusting the screw eye 10 so that the cutting edges will rock outwardly whenever they may clear the lower end of the pipe. When the hole has been sufiiciently enlarged, the drill stem is drawn upwardly in the usual manner and the cutters will impinge against the lower end of the pipe, the rollers 26 engaging the pipe and yielding to the impact so that the force of the spring arms will be overcome and the cutters will be rocked inwardly to the inoperative position shown in Figure 3. As before stated, the movement of the cutters will be equal and simultaneous, owing to the presence of the intermeshing teeth 21, and access of clay or other foreign matter to the teeth in such quantities as to interfere with their successful operation will be prevented by the guarding extension 9. The device is exceedingly simple and compact and as there are but few parts, it is not apt to get out of order and will prove durable and efilcient in use at a times.- i

Having thus described the invention, I claim:

1. An under-reamer comprising a body, cutters journaled in the lower end of the body to rock outwardly to operative position or inwardly to inoperative position and provided with intermeshing gear teeth on their opposed surfaces, interengaging elements on the cutters and the body to limit the relative outward movement of the cutters, and a spring mounted in the body and connected with the cutters to constantly urge them outwardly toward operative position.

2. An under-reamer comprising a body having a recessed portion in its lower end and provided with transverse shoulders on the inner walls of said recessed portion, stop lugs depending from said shoulders, cutters journaled in the lower end of the body below the shoulders to rock outwardly to operative position or inwardly to inoperative position and provided with intermeshing gear teeth on their opposed surfaces, stop elements on the upper sides of the cutters adapted to impinge against the stop lugs on the body to limit outward movement of the cutters, and springs mounted in the body and connected to the upper sides of the cutters to constantly urge them outwardly toward operative position.

3. An under-reamer comprising a chambered body provided with a transverse extension at its lower end, cutters journaled in the lower end of the body at opposite sides of said extension to rock outwardly to operative position or inwardly to inoperative position and provided with intermeshing teeth on their opposed surfaces in the vertical plane of said extension, springs mounted in the chamber of the body and connected with the upper sides of the cutters to constantly urge them outwardly toward operative position, and interengaging means on the cutters and the body to limit their outward movement.

4. An under-reamer comprising a chambered body provided with transverse shoulders on the i T side walls of its chamber and depending stop lugs at the centers of said shoulders, cutters journaled in the body below the shoulders at opposite sides of the stop lugs to rock outwardly to operative position or inwardly to inoperative position, lugs on the upper sides of the cutters adapted to impinge against said depending stop lugs to limit the outward movement of the cutters, webs connecting the lugs on the respective cutters and adapted to impinge against eachi roll upon the inner wall of a well casing, and

a bowed spring housed within the chamber of the body and having its ends connected with the cutters to constantly urge the cutting edges outwardly to operative position.

LUTHER T. PEDIGO.

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