US 1575120 A
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Description (OCR text may contain errors)
March 2 1926. 1,575,120
G. B. I OUDRBACK WELL TOOLA Filed May l2 l 1924 Y PWM lttorrg.
l To all whom it may concern.'
Patented Mar. 2, 19726.
ienoaen B. Lounamcx, or. COMPTON, caLIFoaNra.
Application and lay 12, 19u. serial 1ro. 712,735.
Be it known that I, GEORGE B'. Lourma- BACK, a citizen, of the United States, residing at Compton, in the county Los Angeles and State of California, have invented a new and useful Well Tool, of which a specification is set forth below.
In this specification, and the accompanying drawing, I shall describe and show a preferred form of my invention, and specifically mention certain of its more important objects.- I do not limit myself to the` forms disclosed, since various changes and .adaptations may be madetherein Awithout departing from the essence of my invention as hereinafter claimed; and Aobjects and advantages, other than those specifically men'- tioned, are included rwithin its scope.
My invention relates to well tools and .particularly tobites adapted for deep well drilling, andamong its salient objects are;-
first, to provide a simple and convenient means for adjusting the elective drilling gauge of such a bitto compensate for wear, withoutremoving the tool from the dr1l1 hole; second, to supply an automatic cutterretracting device, permitting the withdrawal of the tool from a hole of smaller diameter than the effective drilling gauge; and, third to accomplish `the required gauge adjust- .ment by a slight raising and lowering of cross sections to the same scale as Figure 2,
taken on the lines 3-3, 4-4, etc., of Figure 1.
Similar reference numerals refer to similar parts throughout the several views.
For illustrative purposes I have Aselected a disk bit having a pair of cutting disks 7 journalled on retractible arms 8. The arms project from the lower end of a longitudinally split tool body comprising the similar halves 9 and 10. These halves are suitably recessed to provide accommodation -free to slide` longitudinally therein,.but is' for the interior working parts, and each -llas a longitudinal groove 11 to serve as a circulating-water course.
The upper ends of the body halves are ot smaller diameter 'than the lower, and form the neck 12. The halves are assembledx face to face by means of a wedge band 13 atthe bot-tom, an lintermediate cylindrical screwed-on shell 14, a screwed-on -ring 15. at the top of the neck, and a pair of throughbolts 16 at the lower extremity. A wedge 17, suitably seated on the exterior of body half 9, serves to tighten upthe wedge band. It is retained in position by means of a deformed washer 18 and screw 19.
Above cylinder 14 is a variably bored and interiorly slotted tubular member 20, carrying a spring-packed stuffing box 21 at its upper extremity, and a similarv but smaller diametei` stufiing box 22 yat its lower -end. Member 2O is taper-screwed into the top end of'lcylinder 14, and is littedlv'vith a. longitudinally slidable splined plunger 23 carrying a taper-screw pin 24 at its upper extremity. `The plunger has an axial bore 25 and is normally kept protruding its full extent from stuffingA box 21. by means of a compression spring 26. 'It is machined to fit the various bores of member 20, and is prevented from turning in the member by its splines 27. At its lower end the plunger .carried 'anp open-bottom cylinder 28 having a pair of interior projecting lugs 29, serving be described.
The upper ends of disk arms 8 are into the body of the tool. They are retained therein by bolts 16 assl throu h wedge shaped slots in the arlins. I Ihe 'upprextremities abut against correspondingly shaped sockets in the body halves-,'tofresist the thrust. of the disks when the tool *is* cutting, and the wedge shaped slots permit the arms to swing-about their rounded ends to provide the variable adjustment of the cutting` diameter. The arms are held atthe desired 'angular position when drilling by means of the square wedge-shaped head 30 of feed screw 31. When the wholetool is lifted however, the arms` are free to drop down upon bolts 1 6 and in so doing they free themselves from engagement b head 30, and retract toward the axis of t e tool.
In vFigure 1 the arms are shown in their -as a part of an escapement mechanism to v ion apart to increase the drilling diameter, and' Figure 2 shows the position they assume when drilling the maximum size hole. AllVhen thus adjusted, however, the arms are still free -to drop down upon the through bolts when the tool is lifted, and in so doing they will come together again as in Figure }1),1but in this case they will hang upon the o ts.
The feed screw 31 does not rotate, since it is vprevented from doing so by its square head. Its neck may also be made square if desired, instead of round asshown. The screw is lowered by turning the flanged feed nut 33. The `upper end face ofthe nut is made in the form of a radial-tooth ratchet 34, engageable by a similar face on the lower end 35 of a deeply bored operating spindle 36. The feed screw in its upper position is nearly wholly within the bore of the spindle, and the latter projects above Athe neck 12 of the body of the tool through a cupped leather packing washer 37. l
Power for operating the spindle and Vfeed nut is sup lied by a previously wound-up torsion spring 38, contained in a recess of neck 12. One end of this spring is attached to the spindle and the other to one of the body' parts. Its stored energy is released as desired to lower the -feed screw by means of an escapement comprising av head 39, having two pairs of lugs 40 and 41 in -vertically spaced planes, working in cooperation with lugs 29 of the yescapement cyllnder. Lugsv 40 and 41 are in quadrature relation as shown, and torsion spring 38 turns the operating spindle 90 degrees at each operation of the escapement.
The escapement is worked by alternately raising and lowering the plunger 23. Fig-1 ure 1 shows the plunger in' its upper posi-4 tion where it isnormally held by spring 26. In this position the lugs 29 in the escapement cylinder engage lugs 40 of the escapement head as shownmost plainly in Figure 4. When the plunger is lowered lugs 29 disengage the upper pair of lugs' on the es' capement head and engage the lower pair 41 after the spindle has revolved 90 degrees under the compulsion of torsion spring 38.
Reaming blades 42 may be added to thc tool if desired and do not constitute an essential part of the present invention. In place o these blades, centering devices may pivoted cutters; a feed screw adapted foi" variably spacing said cutters; a torsion spring adapted for actuating said feed screw; andra plunger adapted by reciprocation to cause said spring to act.
2. A drilling bit comprising; pivoted disk cutters on a vpair of pivoted arms; a feed screw' adapted for variably spacing said arms; a torsion spring adapted for actuating said feed screw; anda plunger withinv the bit, protruding therefrom, adapted by reciprocationto cause said spring to act.
3. A drilling bit comprising; a pair of pivoted cutters; a feed screw adapted for variably spacing said cutters; a torsion spring vadapted for actuating said feed.
screw; an escapement for controllingv thel action of said spring; and a plunger adapt' ed by reciprocation to operate said escapement.
4. A drilling bit comprising; pivoted disk cutters on a pair of pivoted arms; a feed screw adapted` for variably spacing saidv arms; a torsion spring adapted for actuating said feed screw; an escapement for controllino the action of said spring; and a plunger win ed by reciprocation to operate said escapement.
5. A drilling bit comprising; a pair of ypivoted cutters; a feed screw adapted for yariably spacing said cutters; a torsion spring -adapted for actuating said feed screw; an esca ement for controlling the action of sai adapted by reciprocation to operate said escapement; said cutters being ada ted for gravitational retraction when the bitis suspended.
6. A drilling bit comprisin pivoted disk cutters on a air of pivote arms; a feed screw adapted for .variably spacing said arms; a torsion spring adapted for actuating said feed screw; an escapement for controlling the action of said spring; and a plunger within the bit, protruding therefrom, adapted by reciprocation to operate said escapement; said cutters being adapted .for gravitational retraction when the bit is suspended.
GEORGE B. LOUDERBACK.
thel bit, protruding therefrom, adapt?A spring; and ya plunger