US2870993A

US2870993A - Core bit drilling tool

Info

Publication number: US2870993A
Application number: US612504A
Authority: US
Inventors: David H Jahnke
Original assignee: KOEBEL DIAMOND TOOL CO
Current assignee: KOEBEL DIAMOND TOOL CO
Priority date: 1956-09-27
Filing date: 1956-09-27
Publication date: 1959-01-27
Anticipated expiration: 1976-01-27

Description

Jan. 27, 1959 D. H. JAHNKE 2,870,993

vGORE BIT DRILLING TOOL Filed Sept. 27, 1956 I.I" m -mn: i

24 ,5 ,5 2 5,3229 7 5*@ I' Q 0 /0 f /9 INVENTOR.

CORE BIT DRILLMG 'DOQL 'nl )avid H. Jahnke, Detroit, Mich., assignor to Koebel `Diamond Tool Co., Detroit, ,Mch a corporation of Michigan .Apprannsepfemnr .27, ,1956. Seria .Isa-612.504 j 1'8 Claims. (Cjl'. Z55- 47) This invention relates to drilling tools and more particularly to `tools embodying core bits or core drills useful in drilling with a coolant into .various `wall `surfaces or formations. The core bits incorporated in the tools or devices are frequently equipped ywith diamonds on .the cutting or drilling portions thereof -in order to increase the drilling or cutting rate and 1prolong lthe life of `the bits. The drilling tool .embodying the .present linvention is equipped with improved means `not only for introducing under pressure a .coolant Vliquid `to the drilling or cutting locality so as to cool and flush lthe working face or portions of the core bitbut also for disposing of the `coolant and cuttings after the coolant has passed the .bit face.

in the `construction industries, vfor example, drilling with .a `coolant of floors, walls Vand .ceilings is frequently accomplished by means of portable hand drills not in themselves equipped to introduce fthe coolant, such `as water, to the working face of the cutting or core tbit.

4This practice has necessitated the `use 4with the tool .of .a

water swivel which is attached to the drill and to which the cutting bit is attached. During drilling operations `the` `onto the operatoi himself. In addition, it A:has frequently necessitated the collection or .disposal of the coolant .and

`cuttings `by means of pumps orother added equipment.

Frequently ithas added unnecessarily fand o bjectionably to the distance .between the work surface -and `the motivating unit.

The present invention eliminates the foregoing disadvantages `including -the necessity of Vusinga water swivel and, as distinguished from conventional `practice, provides a convenient, effective and relatively simplemethd `of performing the functions of introducing coolant and `removing cuttings -at the bit face and also disposing of the coolant and cuttings .in effective and efiicient inanner after they have passed the rbit -face. AIn addition to the foregoing `the tool embodying the present invention provides a safe, lconvenient and easy means `for enabling the operator to hold and control the `tool and the cutting bit carried thereby atanylocality and during the entire vperiod of operation.

In accordance with the embodiment of `the invention therein illustrated, by |.way .of example, `there is provided an annular diamond studded core bit suitably-affixed lto the forward yend of Va hollowtube or bit body. -The rear end of this tubular bit=body is aiixed -to apower driven shaft operativeto rotate the bit `body as well as vthe core bit. In Athe fully retracted position thereof ,the tubular Lbit `body and core -bit are entirely encased -within a staatent O .being practiced or carried out in various ways.

2,870,993 .Patented Jan- 27, 1959 ice tionary cylindrical shell or jacket of somewhat larger diralrneter than the cylindrical bit body so as to provide .a relatively narrow annular space therebetween. The for- `ward end of the stationary shell or jacket carries a sealing ring adapted to lbe held against and insealing engage- :melit with the Surface 0f the material being ,drilled .and to encircle the drill opening therein. Adjacent to but rearwardly of ythe foregoing sealing ring there islinterposed between the tubular bit body and the outer cylindricaltpsrhell a isecond sealing ring. At the rear end of the outershell there is interposed between the shell and, for example, the ,operating shaft la third `sealing ring. The three sealing rings in effect divide the annular space between the tubular bit 4body and the outer shell or jacket into two longitudinally spaced front and rear water tight chfimbers sealed one from the other. The rear end cf the tubular -bit body is provided with `annularly spaced ports or apertures for enabling the coolant therein to pass `from the fbit fbody into the rear water tight charnber. During Aoperation liquid coolant is introduced under pressure into the front water tight chamber from where .it .is Vforced into the area between `the core `bit and the .material .being drilled. Thence the ,coolant is vforced aroundthe face ofthe bit past the core and into the cylindrical `bit body from where `it is discharged through the ports or apertures `therein into the .rear water .tight chamber. From this chamber the coolant and the cuttings entrained `therewith flow through a hollow hanjdle, attached to the .outer shell or jacket adjacent .the rearend thereof, and into azhose forcon'venient disposal.

`Otherobjects `of Athis invention will appear in .-theffollow-ing description and appended claims', .reference .being `fhad `to vthe accompanying drawings `forming a. part of v.this specication wherein Vlike reference charactesdesig- .nate corresponding parts in the .several views.

.Fig. `l `is a `fragmentary sectional side elevation rillusvtratinga core lbit .drilling tool constructed in accordance `with the present invention.

Fig. 2 is a front end elevation .ofithe structure .shown :in Fig al.

Fig. `3 is a fragmentary 'sectional view of `therforward .portion of `the .tool shown in Fig. .l but illustrating the .core bit in .operating position.

"Before explaining `in detail the present :invention it is ytoibe understood that the invention is not `limited in .its application to -the details of `construction and arrangement of t parts illustrated .in .the accompanying-drawings,.since theinvention .is Acapable of other embodiments and of Also it isto be understood that the phraseology or terminology employed herein is jfor the purpose of description `and not of limitation.

Referring "to the `accompanying drawings there lis `illusllll, .by wayofexample, a core bit drilling `tool provided Ltpbze er cylindrical bit body 11. The rear'end of lthe .fend yQf mower drive- Shaft 1:2 Operative to rotate the t ibe llnisfsuitably aixed in sealing relation tothe forward tube 11 and the core bit 10 carried thereby.

#In its `fully retracted position shown in Fig. l the tube 5131 is=housed within a stationary cylindrical shell .or

1jacketxf13, the latter being of somewhat greaterdiameter thantthe tube 11 so as to provide an annularspace `14 therebetween The length of the shell `or jacket 13 will vary in accordance with the length of the hollow inner Ntube "1-1 which in turn is determined-by thedepth ofthe famosos member forming with the end of the shell an annular slot into which a front sealing ring 16 extends and is held in fixed position therein in any suitable manner. The sealing ring 15 may be fabricated from soft synthetic rubber and, as illustrated in Fig. 1, projects somewhat forwardly of the bit 10 in the latters fully retracted position. Rearwardly of the front sealing ring 16 and preferably proximate thereto is an annular metallic holder 17 disposed Within the cylindrical shell 13 and secured thereto. A front slip sealing ring 18 is secured within the holder 17 and projects slightly inwardly thereof to effect sealing engagement with the tubular bit body 11. This sealing ring may also be fabricated from Soft synthetic rubber. The outer cylindrical jacket 13 terminates in an inwardly liangedy rear end 13a aperturedl to freely receive the shaft 12. Adjacent this lianged end there Ais secured within the jacket 13 a retainer ring 19 also apertured to receive freely the shaft 12. A rear slip sealing ring 20, preferably formed of synthetic rubber, is held between the flange 13a and the retainer ring 19 and is adapted to have slip sealing engagement with the shaft 12.

It will be observed that a front annular chamber 21 is formed between the

sealing rings

16 and 18, this chamber being water tight through the medium of these sealing rings during operation of the tool, as shown in Fig. 3. A rear water tight annular' chamber 22 is formed between the front sealing ring 18 and the rear sealing ring 20, this annular chamber being disposed in the space between the outer shell or jacket 13 and the inner tube 11 and being sealed by virtue of the coaction of the

Sealing rings

18 and 20, respectively, with the tubular bit body 11 and the shaft 12. The rear end of the tubular bit .body 11 is provided with a series of annularly spaced ports or apertures 23 providing communication between the end of the bit body and the rear end 0f the annular chamber 22. From the foregoing it will be seen that in operation the three

yieldable sealing rings

16, 18 and 20, formed preferably of synthetic rubber, in effect divide the annular space 14 between the tubular bit body 11 and the outer shell or jacket 13 into two longitudinally spaced front and rear water

tight chambers

21 and 22 which are sealed one from the other.

In advance of the front sealing ring 18 the outer shell orjacket 13 is provided with a water inlet 24. This jacket is also provided with an enlarged rear outlet opening 25 providing communication between the annular space 14 and a hollow cylindrical handle 26 which preferably inclines downwardly and rearwardly. Held in iixed communication with the water inlet opening 24 is an annular hose connection orl coupling member 27 which is secured to the shell or jacket 13. Removably attached to this coupling 27 in embracing relation thereto is a heavy duty mbber hose 28. This hose extends rearwardly to a point proximate to the upper end of the handle 26 and thence extends downwardly along the front face of the handle. The hose member 28 may be held in position by means of a suitable number o-f clips 29 embracing the hose and attached to the shell 13 and the handle 26. Through the medium of any conventional coupling 30 the lower end of the rubber hose 28 may be attached to la flexible inlet hose 31 also preferably formed of heavy duty rubber. The inlet hose 31 is connected to a source of water supply from which water under pressure may be forced through the inlet hose 28 and coupling 27 into the front annular chamber 21.

As illustrated particularly in Fig. 2, a yoke member 32 embraces the lower part of the shell 13, the upper ends of the yoke being pivoted at 33 to opposite sides of the shell. As illustrated in Fig. l, the yoke 32 is inclined downwardly and rearwardly and terminates in a depending handle 34 provided with a terminal finger engaging portion 34a suitably disposed in advance of the handle 26. The yoke 32 is formed with a projecting sealing knob 35 v normally disposed immediately below and in close relais grasped in the hand the finger engaging portion 34ay may be readily retracted, as illustrated in broken lines in Fig. l, so as to cause the sealing knob to compress the rubber hose 28 so as either to restrict or fully prevent the flow of water therethrough.

The lower end of the hollow handle 26 is provided in any conventional manner with a threaded connection 36 into which the threaded nipple 37 of a garden hose 38 of any standard type may be detachably connected. From this construction it will be apparent that the water or other liquid coolant together with the cuttings entrained therewith will be discharged from the chamber 22 through the hollow handle 26 and thence through the discharge hose 38 to the desired locality for convenient disposal thereof.

With reference to Fig. 3 it will be seen that, during rotation of the bit 10 and progressive forward travel imparted thereto by the shaft 12, the bit while rotating about its central axis will drill an annular hole 39 in the work W. During such operation the front sealing ring 16 will be held in sealing engagement with the face W of the work thus sealing the annular chamber 21 between I the Asealing rings 16 and 18. During the drilling operation performed by the annular bit or cutting head 10 a core 40 of the work will be produced and will progressively project into the central cavity 11a ofthe cylin drical bit body 11. While this operation proceeds the liquid coolant is introduced under pressure through the inlet 24 into the front annular chamber 21 by means of the hose 28. Since the coolant liquid is under pressure it is consequently forced intovthe annular area or space 39 lying between the bit body 11 and the adjacent surface of the material being drilled. Tlience the coolant is forced around the face of the bit 10 and past the core 40 into the central passage 11a of the bit body 11. The coolant and cuttings entrained therewith iiow to the rear end of the bit body 11 and thence passthrough the ports or apertures 23 into the rear Water tight chamber 22 formed between the tube 11 and the cylindrical shell or jacket 13. From the chamber 22 the coolant and entrained cuttings pass through the hollow handle 26 and thence through the discharge hose 38.

I claim:

1. In a drilling device, a tubular bit body, a core bit supported on the forward end of said body, a cylindrical shell embracing said bit body and having the cylindrical wall thereof spaced outwardly of said body to provide a longitudinally extending annular space therebetween, sealing means on the forward end of said shell for sealing the same when in engagement with the face of the work, a second sealing means interposed between said shell and bit body to provide a chamber between both of said first and second named sealing means, a third sealing means providing a second chamber between said shell and body at a locality intermediate said second and third sealing means, said bit body being provided with a port' means for the flow of liquid coolant from said bit body into said second chamber, means for introducing liquid coolant into said first named chamber, and means communicating with said second named chamber for discharging liquid coolanttherefrom.

2. In a drilling device, a tubular bit body, a core bit supported on the forward end of said body, a cylindrical shell embracing said -bit body and having the cylindrical wall thereof spaced outwardly of said body to provide a longitudinally extending annular space therebetween, sealing means on the forward end of said shell for scaling the same when in engagement with the face of the work, a second sealing means interposed between said shell and bit body to provide a chamber between both of said first and second named sealing means, a third sealing means providing a second chamber between said shell and body at a locality intermediate said second and third sealing ineens, Asaid bit bodylbeing ,provided with. a gpo'r't ,i means the bit through saidbit body and said portmeans into ,said second ,named chamber, ,and fmeans .for .discharging liquid` Acoolant `from said second .namedchamben g `3. In ,a drilling device, `a .tubular ,bit body,` 4al core ,bit supported on the ,torwarfdendwbfsaidbody, a cylindrical shell `embracing saidbit `body and .having the `cylindrical wall Athereof spacedioutwardlytf saidbody `to provide `a longitudinally extending, annular ,space ,.therebetween, sealing means on the forward rend of Said shell fortsealing the same when "in engagement with .theffa'ceof the work, a second sealing means interposed between `said shell and `bit body to `provide a `'(:harber betweenboth `of said first and second named sealing means, a third `sealing means providing Aa `second chamber forwardly ,thereof "between .said shell and'body and rearwardly of said second ,sealing .means, said bit body being,provided W'ith `a port means for the 'ilow `of liquid colant from said bit body Vinto s aid second chamber, means fonintroducingliquid coolant into said first Anamed chamber, and means including a handle having a passage therethrough communicating with said second named chamber `for discharging liquid coolant therefrom, i

4. In a drilling device, a tubular b'itbody, arcorebit supported on the forward end of saidbody,` a cylindrical shell embracing said bit body tandhaving the cylindrical wall thereof spaced outwardly of said Sbody to provide a longitudinally extending annular spaceV therebetween, seal- "ing means atthe forward end of vsaid shelli'for sealing the same when in engagement with the face ofthe work, a second sealing :means ,interposed `between .said shell and bit body to provide a chamber between both of said rst and second named sealing imeans, :a third `sealing means providing a second chamber between said shell yand body .and between both of said second and" third sealing means,

said bit body being provided with ,a port means for the flow of liquid coolant from said ybit body into saidrsecond chamberLmeans for introducing liquid coolant under pressureinto said first named chamberfor flow `around 'the face of the core bit andthence away from the bit through said bit body and said port means into said second named chamber, and means including a handle having a passage therethrough communicating with said second chamber for discharging liquid coolant therefrom.

5. In a drilling device, a tubular bit body having a core bit at the forward end thereof, a hollow shell embracing said bit body and spaced outwardly thereof, sealing means for sealing the forward end of said shell against the face of the work, a second sealing means interposed between said shell and bit body to form with said first named sealing means a chamber between the shell and bit body, a third sealing means providing a second chamber between said shell and body and between both of said second and third sealing means, means for introducing liquid coolant into said rst named chamber for flow around the core bit and thence into said bit body, said bit body being provided with a port means in advance of said third sealing means for the flow of liquid coolant from the bit body into said second chamber, and means communicating with said second chamber for discharging liquid coolant therefrom.

6. In a drilling device, a tubular bit body having a vcore bit at the forward end thereof, a hollow shell embracing said bit body and spaced outwardly thereof, sealing means carried by the forward end of said shell for sealing the same against the face of the work, a second sealing means interposed between said shell and bit body to form with said rst named sealing means a chamber between the shell and bit body, a third sealing means providing a second chamber between said shell and body rearwardly of said second sealing means, means for introdueing liquid 'coolant into said `first named elianibei `for flow aroundthe corebit and thence intofsaid'bitbody,

saidwbit body `beingprovided4 rwitlraport means `in advance of said third sealing .means forthe flow of liquid coolant `from thevbit :body 4,into said second chamber, and means including .a handle `having a passage therein communicatfing :.with .said second chamber ata `locality intermediate .saidsecondand thirdsealingmeansfor discharging liquid coolant therefrom.

`.providing asecond chamber between `said shellfand body ,rearwardly yof said second i sealingtmeans, a conduit; communicating with said zirst named chamber forintroducing liquid coolant `under.pressure.,thereinto .for ow around the core bit andthence into. said tubular hit body, lmeans foncontrolling thellow of coolant from saiclconduit into said first named chamber, saidbit `,body .being pro- "from said bit body `'into saidl second chamber, andi-means for `discl'larfging liquidA coolant yfrom said second `,chamber -at a `locality intermediate said second and Athird sealing means.

8. In a drilling device, atubular bit body 4having Aa core .bit .at the forward endthereof, ahollow shell ernibracing said `bit body `and spaced outwardly lthereof, sealing means carried b`y the forward `end offsaid shell for sealing the `same .against-the face of `the work, a-second sealing .means interposedV betweenwsaid shell landl bit body to form with said `first named sealing means ya chamber between .the shell and bit `bodypa thi-rd sealing means providing a second `chamber between said shell and body rearwardly of `said second sealing means, a conduit communicating with said Vfirst -named chamber for introducingliquid coolant under pressurethereinto forflow around thercore bit andthence into said tubular bit body, means for controllingtheflowof coolant from said conduit into said. firstnamed Chambergfsaid bit-` body being provided with a port means for the flow of liquid coolant from said bit body into said second chamber at a locality intermediate said second and third sealing means, and means including a handle attached to said shell and having a passage therein communicating with said second chamber for discharging coolant therefrom.

9. A drilling device according to claim 7 wherein said controlling means includes a pivotally mounted manually operable lever.

10. A drilling device according to claim 8 wherein said controlling means includes a pivotally mounted manually operable lever disposed proximate to said handle.

1l. In a drilling device, a tubular bit body having a core bit at the forward end thereof, a hollow shell ernbracing said bit body and spaced outwardly thereof, sealing means carried by the forward end of said shell for sealing the same against the face of the work, a second sealing means interposed between saidl shell and bit body to form with said rst named sealing means a chamber between the shell and bit body, a third sealing means providing a second chamber between said shell and body rearwardly of said second sealing means, a flexible conduit communicating with said first named chamber for introducing liquid coolant under pressure thereinto for ilow around the core bit and thence into said tubular bit body, a swingable manually operable lever having means engageable with said flexible conduit to compress the same and control the llow of coolant into said first named chamber, said bit body being provided with a port means for the ow of liquid coolant from said bit body into said second chamber, and con- 7 duit means for discharging liquid coolant from said second chamber.

12. A drilling device according to claim 11 wherein a depending handle is attached to said shell and through which said conduit means extends.

13. In a drilling device, a substantially cylindrical outer jacket adapted to be held in predetermined position relative to the work being drilled, work drilling means including a tubular bit body and a rotary and axially shiftable shaft secured to the rear end of the bit body and extending therewith axially of and interiorly of said jacket, a core bit secured to the forward end of said bit body, a plurality of longitudinally spaced sealing devices for forming between said jacket and work drilling means a pair of longitudinally extending front and rear chambers sealed one from the other during the drilling operation, conduit means for introducing liquid coolant under pressure into said front chamber for llow around the core bit and thence rearwardly into said tubular bit body, said bit body being provided with a `the work being drilled, work drilling means including a tubular bit body and a rotary and axially shiftable shaft secured to therear end of the bit body and extending therewith axially of and interiorly of said jacket, a core bit secured to the forward end of said bit body, a plurality of longitudinally spaced sealing devices for forming between said jacket and work drilling means a pair of longitudinally extending front and rear chambers sealed one from the other during the drilling operation, conduit means for introducing liquid coolant under pressure into said front chamber for flow around the core bit and thence rearwardly into said tubular bit body, said bit body being provided with a port means for the ow of liquid coolant from said bit body into said rear chamber, and means including a passage in said handle communicating with said rear chamber for discharging liquid coolant therefrom.

15. A drilling device according to claim 13 wherein means is provided for controllingrthe ow of liquid cool,- ant through said conduit means into said front chamber.

16. A drilling device according to claim 13 wherein manually operable lever means disposed proximate to said handle is provided for controlling the llow of liquid coolant through said conduit means into said front chamber.

17. A drilling device according to claim 1l wherein said lever is pivotally mounted on said shell, a depending handle being attached to said shell adjacent said lever and through which said conduitmeans extends.

18. In a drilling device, a substantially cylindrical outer jacket, a handle extending from said jacket for manually holding said jacket in predetermined position relative to the work being drilled, work drilling means including a tubular bit body and a rotary and axially shiftable shaft secured to the rear end of the bit body and extending therewith axially of and interiorly of said jacket, a core bit secured to the forward end of said bit body, a plurality of longitudinally spaced sealing devices for forming between said jacket and work drilling means `a pair of longitudinally'extending front and rear chambers sealed one from the other during the drilling operation, conduit means including a ilexible hose for introducing liquid coolant under pressure into said front chamber for flow around the core bit and thence rearwardly into said tubular bit body, said bit body being provided with a port means for the flow of liquid coolant from said bit body into said rear chamber at a locality intermediate said sealing devices, means communicating with said rear chamber for discharging liquid coolant therefrom, and a swingable manually operable lever engageable with said `hose for compressing the same and controlling the tlow of liquid coolant into said front chamber.

References Cited in the tile of this patent UNITED STATES PATENTS 296,681 McDerby Apr. 8, 1884 766,588 Brejcha Aug. 2, 1904 931,611 Hutchings Aug. 17, 1909 1,517,556 Grant Dec. 2, 1924 2,091,023 Arterbury Aug. 24, 1937 2,712,323 Snyder et al July 5, 1955