US1484995A - Roller core drill - Google Patents

Description

Eek. 26. 1924.

J. D. PACE ROLLER CORE DRILL F iled Nov. 30. 1921 A HOB/VH8 Patented Feb. 26, 192d.

l i E x:

JEFFERSON DAVIS PACE, OF SHREVEPORT, LOUISIANA.

ROLLER CORE DRILL.

Application filed November 30, 1921.

To all whom it may concern:

Be it known that I, JEFFERSON DAVIS PACE, a citizen of the United States, and a resident of Shreveport, in the parish of Caddo and State of Louisiana, have invented certain new and useful Improvements in Roller Core Drills, of which the following is a specification.

My invention relates to improvements in well drills, and it consists in the constructions, combinations and mode of operation herein described and claimed.

One of the objects of the invention is to provide an improved bearing for each roller cutter, shot being mixed with heavy grease by which it is lubricated, to render the grease mobile for the purpose of reaching the bearing surfaces.

Other objects and advantages will appear in the following specification, reference being had to the accompanying drawing, in which Fig. 1 is a vertical longitudinal section of a well drill embodying the improved hearing for the roller cutters,

Fig. 2 is a sectional view illustratin how roller mountings may be gripped y a blade-cutter drill, and

Fig. 3 is a detail perspective view of one of the roller holders and its roller cutter. A drill rod 1 carries a coupling sleeve 2 which terminates in brackets 3 upon which the bearing stems 4 of the conical roller cutters 5 are mounted.

It is the bearing and lubricating means for the roller bits or cutters 5 which constitutes one of the important features of the invention. The stem 4 (referring only to one of the aforesaid devices, since both are alike) is threaded only at the exposed end so that a nut 6 may be applied and secured by a cotter pin 6 so as to hold the stem or hollow bolt 4 in place. A shoulder 7 abuts a washer 8 and enables tightening the nut 6 firmly on the body or sleeve 2.

A threaded collar 9 holds the body 10 in place in the bit 5. The body 10 has a flange 11 which extends beneath the collar 9. The concavity 12 is the bottom of the recess inside of the bit 5, into which the collar 9 is screwed and which receives the body of the stem. It is to be observed that the collar 9 has spanner wrench holes 9 which enable the collar to be screwed in place.

Serial No. 518,851.

A central recess 13 in the body 10, has a a plurality of radiating apertures 14 through which some of the grease G is enabled to reach the bearing surfaces between the ,body 10 and collar 9. This is a heavy-bodied grease which is packed in the recessesinside of the bit. grease resists the entrance of moisture and other foreign. substances into the interior of the bit and its associated parts. Also, being heavy-bodied, the grease requires something to render it mobile in order that theapertures 14 maybe penetrated and the bearing surfaces reached.

A suitable quantity of shot 15 is mixed with the grease G. The rapid revolution of the bit 5 causes the shot to circulate in the grease and thereby render it sufficiently mobile to accomplish the purpose stated. The bits 5 are separated so as to leave a central passage which leads into the core tube 16. This particular type of drill is adapted to cut through rock or other hard formation.

As the drill cuts deeper into the rock, a central core gradually rises into the tube 16 by virtue of the fact that the material is cut away in a circular path the width of the bit 5, leaving the central core to rise in the tube and past the slips or grippers 17. At suitable intervals the drill 1 is removed from the bore. The tapering slips will then ride down the inclined walls of the recess 18 which contains them, and thus secure a firm hold on the core. The core breaks off and thus the drill contains a. sample of the formation through which the drilling operation is performed.

The slips have teeth 19 on the inside so as to secure a hold on the core. A spring wire 20 holds the slips together and prevents them from dropping out of the bottom. This spring wire occupies a groove formed in the slips, this groove, however, being shallow so that the wire extends above the surface of the slips. The outstanding portion of the spring wire furnishes a bearing which engages the wall of the recess 18 and thereby causes a more prompt closure of the slips upon a core sample than would be possible were the direct engagement of the outsides of the slips with the recess wall depended upon. A top 21 closes the top of the tube 16. This top has a plurality of openings 22 through which water or other fluids may Being heavy-bodied, the

which may be caught by a fishing tool should it becomenecessary to pull* the drill out of the casing or bore.

A circulation of water is maintained so as to keep the bit 5 clear. This water passes down inside of the drill rod l, through Wash holes 24 in the coupling sleeve 2 and up around the'outside of the drill rod.

The modification in Figure 2 illustrates the adaptation of bits or cutters which are constructed in accordance with the invention, to a drill such as-is disclosed. in my Patent 1,351,003 granted August 24, 1920. Instead of using the coupling sleeve 2 for the purpose of securing cutte'r blades on theblock or body 25, they are employed to clamp holders 26 which, like the coupling 2 in Fig. 1, have brackets 3 upon which the bearing stems 4 and bits 5 are mounted. These holders have inclined surfaces27 against which a corresponding surface on the inside of the sleeve 2 bears and produces a wedging action to force the heads 28 into recesses 29 at the base of the block 25. This block includes an extension 30 against which the inner side of the holders 26 have bearing.

-1. A drill having a rotary cutter, recessed bearing means for the cutter with radial openings, and shot mixed with grease packed in the recess rendering the grease mobile for penetration of the openings to the bearing I surfaces.

2. A drill having supporting means, a rotary cutter and a bearing stem rotatably mounting the cutter on the supporting means, including an enlarged body presenting a shoulder against the supporting means,

and havinga recess with radial apertures leading to bearing surfaces, and grease packed in the recess mixed with shot to cause the penetration of the apertures by the grease when the cutter rotates.

3. A drill having-supporting means, a rotary cutter with a recess, a bearing stem having a body presenting a shoulder against the supporting means when the stem is secured therein, and having a recess with lateral openings, a flange on the body, a collar fitted into the cutter recess to be engaged by the flange, and grease packedin the cutter and body recesses, mixed with shot to agitate the grease causing its entrance into the opening to reach the ,"bearing surfaces.

4. A well drill having a coupling sleeve provided with a tapering opening having an annular shoulder formed by a smaller opening which enters the large part of the tapering opening, a core sample tube fitted into the smaller opening, gripper slips situated in the tapering opening each having a depression forming a circular groove when the slips are assembled, and resilient means fitted in said groove to keep the slips to 'gether said means extending'above the surface of the slips so as 'to make contact with the wall of the tapering opening and thereby insure a prompt closure of the slips upon a downward motion in said opening.

- JEFFERSON DAVIS PACE.

Images