US1297889A

US1297889A - Core-drill.

Info

Publication number: US1297889A
Application number: US16151217A
Authority: US
Inventors: Frank Miller
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-04-12
Filing date: 1917-04-12
Publication date: 1919-03-18
Anticipated expiration: 1936-03-18

Description

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FRANK MILLER, OF NEW YORK, N. Y.

CORE-DRILL.

Application nled April 12,

. To all 'whom t may concern:

Be it known that I, FRANK MILLER, a subject of the Crown of Great Britain, (who has declared his intention of becoming a i citizen of the United States, residing at New York, in the county of ew York and State of New York, have invented a certain new and useful Improvement in CoreDri1lS, of which the following is a specification.

This invention relates to core drills, and in particular to a new form of cutting tool used in connection therewith and to the means for supplying the abrading material and also forsupplying the uting material to break oli and remove i? core.

The objects of my invention are to improve the construction of core drills at present used; tov provide a double cutting bit having an improved form of shot feed, and

also to provide a new means for admitting the grouting material to break olf the core and to raise the core to the surface.

Diiculties have been encountered in usin core drills of types previously known in so t y strata or in strata alternately hard and soft for the reason that the core is subjected throughout its length to the abrading action of the shot passing through the interior of the core barrel to the cutting edge. The friction thus set up between the core and core barrel is frequently suilicient to break olf the core wherever a seam of soft material occurs, and it is to overcome these objections that the present construction has been devised.

With these and other Aobjects in view, a new form of core drill has been devised, a practical embodiment of whichis shown in the accompanying drawin .1

In the drawing annexed ereto and formina part ofthxs specification,

igure 4 1 is a vertical section taken through the lower section of my improved core rill2 Fig. 2 1s a section taken on the line 2--2 of Fig. 1,

3, is a section taken on the line 3 3 of g. 1, and

Fig. 4 shows a, slight modification of the` core arrel.

In the drawings, 1 designates the core barrel which is formed by a section of ritied pipe or any other section of tubing having a spiral or other protuberance extending throughout its len h, as more clearly shown in Fig. 3, at 2. e core barrel may also- Specification of Letters Patent.

Patented Mar. 18,1919.

1911. Serial No. 161,512.

be formed of heavy tubing in which grooves, preferably spiral, have been cut. The rificd or other pipin shown in the drawings is however well a apted to the purposes of this part for the reason that the protuberance such as that shown at 2, Fig. 3, acts as a support for the core barrel against the outer annulus or tubing 3 forming the outer cutting tool and holds it centrally thereof and provides a free and open passage for the shot or abrading material supplied to the cutting tool or bit formed by the lower edges of the tubes 1 and 3. Surrounding the tubing or lpipe 1 is the outer tube 3 against which the spiral groove or helix 2 or other protuberance rests throughout its length. The two tubes 1 and 3 at. their lower ends form the cutting or abrading tools of the drill. The material which does the actual cutting or abradin which is commonly referred to as slot is supplied through the annular space between the tubes 1 and`3 to the lower ed es of the tubes where *The cutting takes p ace The lower edges ofJthese tubes 1 and 3 may be supplied .vith an oblique cut as shown at 4 as is usual in this type of drill. y

The tubes 1 and 3 at their upper ends are secured to a core barrel plug or coupling 5 by means of threaded connections 6 and 7. Through the center of this plug or coupling 5 extends a hole 8 and above the coupling 5 extend the hollow drill rods 9 commonly used in thesedrills and by means of which the drill bit is rotated and through which.

abrading material or shot is supplied to the cutting edges of the bit or cutting tool. f

Extending from the lower end of the hole 8 and through the coupling 5 are three or more` holes 10 bored radially from the central hole 8 to the outer circumference of the lower end of the coupling 5. It will be seen from Fig. lthat these small holes 10 in connection with the hole 8 and the annular space between the tubes 1 and 3 form a contlnuous passage for the shot or other abrading material supplied to thedrill bit. This passage will be entirely within the parts of "the drill so that none of the shot can come in contact with the core which would have the effect of cutting away the core and also the shot are kept away from the outer Walls of the cutting tool which otherwise would greatly increase the friction and power losses of the tool as well as cause losses of the shot or abrading material through crevices in the strata. through which the drill is cuttin Norma ly closing the lower end of the hole 8 through the plug 5 is a valve 11 pressed against its seat 12 formed in the plug 5 by means of a spring 13. The valve stem 14 passes through a hole in alinement with hole 8 in a yoke piece 15 by means of which the valve 11 and spring 13 are retained in position. The spring 13 is made strong enough to hold the valve 11 closed during the normal operation of the tool and while shot is being supplied to the tool. The valve 11 is, however, opened by heavy pressure against it when it is used for a purpose presently to be described.

The location of the valve 11 exactly in the position above described is not essential to my invention. This valve 11 may be equally well located somewhat above the position shown. In that case the holes 10 would also be raised to a corresponding degree and could then be drilled to intercept the space between the core barrels at the upper edge of the core barrel 1. This would avoid drilling hole 8 through the threaded portion of the core barrel 1.

In the operation of my improved core drill, during the normal operation or while cutting or abrading is taking place the drill 4is slowly rotated by means of the drill rods 9 and shot or other abradiiig material is supplied through the hollow drill rods and through the hole 8 in the plug or coupling 5 to the annular space between the cutting tubes 1 and 3 through which it passesto the lower ends of the tubes to abrade or 'iiit the strata through which the drill is passing. When a suiiicient length of core has been cut' to fill the core barrel within the tube or pipe 1 the rotation of the drill is stopped and grouting material usually comprising heavy and coarse gravel is passed down through the drill rods 9 and then the pressure within the rods 9 and within the plug or coupling 5 is greatly increased by increasing the pumping of iwater into the rods 9. This forces the valve 11 to open and admit the grouting material to the core barrel.- The grouting material is then allowed to force its way down the inside of the tubin 1 by means of the s ace between the tubing 1 and the core to t e lower end of the core barrel. This action may he somewhat aided by a few partial turns of the cuttin tool. By this means the grouting material becomes ti htly wedged between the core and inner tul 1 when the core is broken off and as it is still tightly wedged by means of the grouting material it may be drawn to the surface with the cutting tool.

From the above description it is thought that the construction and operation of my improved core drill will out further explanation,

be apparent with- It is to be understood that the present showing and description disclose only one specific modification of my invention, and other forms and embodiments are included within the spirit and scope of the same as expressed in the appended claims.

lVhat I claim is:

1. In a core drill, a hollow drill bit comprising inner and outer concentric tubes and means for supplying abrading material between said tubes to the cutting edge of said bit.

2. In a core drill, a hollow drill bit coinprising inner and outer concentric tubes, one of said tubes being provided with a spiral protuberance whereby said tubes are separated and abrading material may be supplied to said bit between said tubes.

3. In a core drill, a core barrel, a tubing surrounding said core barrel and providing a passage between said outer tubing and core barrel, a cutting tool on said core barrel and outer tubing adapted to use abrading inaterial and means for supplying abrading material from the surface to said cutting tool as the cutting progresses through the passage within the drill and outside of said core barrel.

4. In a core drill, a core barrel, a cutting tool on said core barrel adapted to use abrading material and means ooperating with said core barrel to supply abrading material from the surface to said cutting tool as the cutting progresses out of contact with the core and the wall of the hole being drilled.

. 5. In a core drill. inner and outer tu'bes providing abrading tools on their lower edges, said tubes being separated suliiciently to provide a passage for abrading material;

to pass downwardly between them to said lower edges.

6. In a core drill. a drill bit having a tube comprising a core barrel, a, tube surr0unding said core barrel, a hollow drill rod means ooperating with said drill bit for supplying abrading material through said drill rod to said drill bit between said tubes, and means normally closing said core barrel for permitting grouting material to ass frim said hollow drill rod to said core bar: re

7. In a core drill, tubes providing a dou-l ble drill bit having a core barrel provided with means for su plying abrading mate` rial between the tu es forming said doubl drill bit, a central hollow drill rod, a hol low coupling connecting said drill bit and hollow drill rod, and means normally clos-j ing said core barrel for permittin grouting material to pass through saidI hollow` drill rod directly to said core barrel.

8. In a core drill, a. double drill bit hav ing a core barrel, a hollow drill rod, meani coperating with said drill bit for normali:1

mensen supplying abrading material to said double dnl bit through said hollow drill rod, a valve in said core drill normally held closed and adapted when opened to open a tissage between the hollow drill rod and t e core barrel.

9. In a core drill, tubes forming a' double drill bit having a core barrel means coperatin with seid drill bit or supplying abrading material between the tubes forming said double drill bit, comprising a eentral hollow drill rod, a hollow coupling con- 'sege from the ho necting said drill bit and hollow drill rod, seid parts forming a passage for normally su lying ebrading materiel through said ho ow drill rod, a, valve contained within said coupling, Suid valve adapted to be opened under heevly pressure to open a peslow drill rod to the core barrel.

In testimony whereof I have my hand.

hereunto set FRANK MILLER.