US 2086486 A
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Description (OCR text may contain errors)
July 6, 1937. w. T. WOODS 2,086,486
ROTARY DISK BIT Filed Jul 6' 1935 www l3 11v VENTOR WALTER T. WOODS B gm-ofil/ 1 94442256 ATTORNEY Patented July 6, 1937 1| STATES ROTARY DISK BIT Walter '1. Woods, Long Beach, Calif., assignor to Woodsco Tools, Ind, Long Beach, Calif., a corporation of California Application July 26, 1935, Serial No. 33,217
My invention relates to rotary disk bit, and has for its principal objects the production of adequate support, both axial and lateral, for the disk bearings, adapted to most efficiently distribute to the body of the bit the various stresses and strains communicated through the disks during operation, and to provide a construction facilitating assemblage in which bearing surfaces may be easily replaced when worn, and in which the parts are held so securely in their assembled positions as to eliminate every reasonable possibility of loss in the hole.
Another important object is to provide hardfaced teeth for breaking down the core between the disks, so disposed as to be easily built up and reconditioned when worn, which core-breaking teeth permit an adequate separation of the disk-cutters to insure their sufficient rotation to constantly present new cutting surfaces.
It is an object, also, to provide features of construction which will minimize danger of clogging of the disks by cuttings.
Still another object is to so form and dispose the circulating orifice as to most efficiently direct and distribute the mud fluid, as well as by its form to increase capacity.
Other objects and corresponding advantages will be apparent to all of skill in the art to which this invention appertains in the light of the following more detailed description.
In the drawing Figs. 1 and 2 are elevations of the bit;
Fig. 3 is a section on line 3-3 of Fig. 1;
Fig. 4 is a view in elevation of the bottom of the bit.
Referring to the drawing in detail, indicating numerals of which refer to similar parts throughout the several views, 6 designates the. head of the bit, which is provided with a threaded box I at its upper end for attachment to the depending pin of a shank (not shown) which in turn is secured in the usual manner to a drill pipe (not shown), the lower part of said head 6 being centrally bifurcated vertically by slot 8 (Fig. 2), the
' two short legs formed thereby being in turn similarly bifurcated so as to form two outer legs 9 and It and two inner legs II and i2.
Each pair of legs, consisting of an outer and an inner member, is bored transversely adjacent its lower end to a diameter to receive the shanks of respective disk pins l3 and is also counterbored (Fig. 3) to countersink heads 13a and nuts i311 (said nuts being preferably welded in their respective counterbores) of said respective disk pins, said bores being axially in the same horizontal plane and parallel both with each other and with chords of a circle representing a cross-sectional area of the upper part of head 6, thus to provide for the support of axial bearings of the disks later to be described which will be offset from each other as most clearly shown in' Figs. 1 and 4.
Bevelling of faces Hi and I5 (as shown in Fig. l) of respective adjoining pairs of legs, results in the substantial centralization of said disk pin bores each with respect to the lower ends of its respective pair of legs.
Bearing bushing it, having an integral thrust flange or collar 18a, when assembled with thrust washer 11 forms an easily replaceable spool bearing upon which disks I8 are respectively rotatably mounted (as most clearly shown in Fig. 3).
Cap screws 19 threaded into, with their heads counter-sunk in each of outer legs 9 and I0 adjacent the peripheries of disk-pin heads Not so as to optionally engage any of a series of arcuate notches 20 in the peripheries of said disk-pin heads, form a means for securely locking diskpins E3 in their assembled operative positions.
Inner legs H and I2 are each provided with downwardly extending hardened teeth 21 and 22, each designed to out in the direction of revolution of the bit to break down and cut away any core left by the disk-cutters.
An orifice 23 for circulating fluid is centrally disposed between the cutters, and is of rectangular form. Owing to the shallowness of the bifurcation separating inner legs II and i2 and the rectangular cross-sectional contour of said orifice, circulating fluid is directed and distributed closely adjacent to the cutting edges.
What I claim and desire to cover by Letters Patent is:
1. In a device of the character described, a bit head vertically furcated to form two pairs of spaced-apart legs, a pair of disks, an axial bearing for each of said disks carried by said legs in off-set relation to each other and in the same horizontal plane, and a tooth adjacent said disks having its cutting edge perpendicular to the plane of said disks.
2. In a device of the character described, a bit head having its lower portion furcated to form two pairs of spaced-apart legs, the two innermost of said legs carrying depending cutter blades, a pair of disks, axial bearings for said disks each carried between said legs off-set from each other and in the same horizontal plane.
3. In a device of the character described. a forked bit head, a pair of disks pivoted in different furcations of said head, a longitudinally disposed circulation passage through said bit head having an orifice between said disks, and teeth on the lower end of the inner furcations of said bit head.
4. In a device of the character described, a bit head divided into a plurality of furcations, a central passage through said head, a tooth on each side of the orifice of said passage, and a pair of vertically-disposed disks rotatably secured at right angles to the cutting edge of said tooth between two of said furcations of said head.
5. In a device of the character described, a forked bit head, a pair of disks, two pins for axial rotatable support of said disks in different furcations of said bit head, and on opposite sides of the plane through the vertical axis of the head which is perpendicular to said pins, a central passage through the bit head having an orifice between said disks, and non-rotatable teeth secured to said bit head having their cutting edges disposed in a horizontal plane intermediate the body of the bit and the lowest cutting edges of said disks.
tooth having its cutting edge in a higher horizontal plane than the lower edges of said disks.
'7. In a device of the character described, a bit head having its lower portion furcated to form two pairs of spaced-apart legs, the two innermost of said legs carrying depending cutter blades, 2. pair of disks, each with both-of its radial surfaces convex, axial bearings for said disks each carried between said legs off-set from each other and in the same horizontal plane.
8. In a disk bit, a forked bit head, a pair of disks each with its radial surfaces convex pivoted in different furcations of said head, a longitudinally disposed circulation passage through said bit head having an orifice between said disks, and a non-rotatable cutting tooth carried by one of said furcations.
9. In a disk bit, a forked bit head, a pair of disks with vertical planes through their centers