US1543871A - Water-tube back-head connection for rock drills - Google Patents

Description

June 3o, 1925."

'w. PRELLwlTz WATER TUBE BACK HEAD CONNECTION FOR ROCK DRILLS l'NvENoR Hag ATTO NEY when:

Filed March 21. 1924 .ff/4 ...n

Patented June 30, 1925.

UNITED STATES atraen PATENT OFFICE. y

WILLIAM IPRELILIV'ILZ,v OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEVI JERSEY, y.A CORPORATION F NEW JERSEY.

WATER-TUBE BACK-HEAD CONNECTION Fon' ROCK DRILLs.

Application filed March 21, 1924. Serial No. 700,789.

T 0 all whom t may concern.

Be it known that I, Timm-in PRELLWITZ,

a citizen of the United States, and a resident of Easton, county of Northampton, and State of Pennsylvania, have invented a cer- Rock Drills, of which the following is a specification Yaccompanied by drawings.

rThis vinvention relates tov rock drills of the hammer type, but more particularly to an improved connection between the liquid conductingftube and the back head of the rock drill, including an improved means forV removing theliquid conducting tube in the event of breakage thereto or for any other reason. ,v

Most rock Vdrills of the hammer type einploy a tube which 'extends through the machine and a short distance into the drill steel for conveying liquid lunder pressure to the hollow bore of the drill steel for the purpose of cleansing the drilled hole. Thesevtubes frequently becomes so'l damaged vthat they areof no further use which necessitates the removal of the old tube and the substitution" of a new tube.` Heretofore, much trouble`v and annoyance has been occasioned in the -removal of thedamaged tubes and usually special tools are required for this operation. It has also been a difficult problem to ob- .tain an eflicient fluid tight connection be` tween the liquid conducting tube and the back head and frequently the liquid (usually water) enters the working parts of the machineand washes away the lubricant.V This, of course, is disadvantageous andv tends to shorten .the vlife of the ma? chine.

By means of this invention theabove difiiculties are overcome` and aneflicient and reliable fluid tight Aconnection is obtained between the liquid conducting tubey and the back head of the machine and by means ofa stem, which is readily accessible, the

lliquid conducting tube andassociated parts may be conveniently vremoved from the back head of the machine", Another rfeaturel of this invention resides in the provision of a vise formedonthe machine which is adapted to receive `a sleeve secured to 'the liquid conductingtube to enablethe sleeve and tube to beseparated from the back head plug so that` a new tube fmay be substituted therefor, .thereby eliminating the necessity `of specialtools;

varated from the'back head One object of this invention is to enable a liquid conducting tube to Vbe secured to a backend portion of a rock drill in a simple/and improved manner so that an fenicient fluid tight connection therebetween tain Water-Tube Back-'Head Connection for,`

fdrill to be readily removed without the use of special tools. f Y

A furtherv objectV of the invention'is to provide means on the rock drill whichwill enable the liquid conducting tube to be sep plug without the necessity. of special tools. Further objects of the invention will hereinafter appear and the invention consists in certain features of a construction and combination of elements described in the following specification, definedv in the appended claims and shown in the accompanying drawings, in which Figure l is a side elevation partly in vertical section of a rockdrill of the hammer type,

Figure 2 is an enlarged detailed vertical rsection of the connection between the liquid conducting tube and the back head shown in Figure l, y

Figure 3 is a transverse section taken on the line 3 3 of Figure 2 looking in the direction of the arrows,

Figure 4l is a perspective view of a portion of the back Vhead showing the means for removing the liquid conducting tube from the back head plug,

Figure 5 is a sectionalelevation showing the invention applied to a rock drill of the drifter type, and

Figure 6 is a sectional elevation showing a modified form of a water tube connection.V

Referring to the drawings, the invention vis shown embodied in a rock drill of the jackhammer type having a cylinder A to v"which is connected the front head B by suitable side'boltsfnot shown) A chuck C is located in the front head B and is adapted to receive the drill steelD for receiving'the `impact blows of the hammer piston E. A

front cylinder bushingr F preferably separatesthe cylinder A from: the front head' Band in this instance a valve chest G is connected 'tothe cylinder A. Motive fluid is supplied to the rock drill through theinlet H and a suitable 'distributing 4,valve is located `in the 'valve v`chest G Vffordistributing the motive fluid to the hammer piston E.

A back head J is separated frolntlie cylbarl head L is-ilocated AVinside't'heratchet ring K. Suitable paWls (not shown) are carried by the rifle `ba'1"he"ad"L"and cooperate 'v'vith the ratchet ring K for-enablingfthe rifle-bar O to rotate in one direction but preventing rotation in the oppositedirection Suitable washers iP :are in :this instance located on the opposite ends @of rthe rilebar-head L. The 'rifle bar lO v extends intoffthe-riiie .nut Q Acarried by lthe piston "andlasthe 'piston E reciprocates in the cylinder yrotationf-is tiansmittefd:to-the` drill steel -D by *means of Ign this .instance the back head J isffo'rmed with a tubular extension R `l`on which is slidably 1A mounted -a-sleeye [S carriedA by the handle T. A [coilspri-njg U islinthis instance -Inounted in the'extension 'Ran-d'vbearsat one -endagainst the inwardly @eX-tending flange V inthe handle -T andy-the other end @bears again'st -the botto-In 'of the extension R.

bln this manner the ars -and shocks :set -up .in theioperation of the tool will beabsorbed by thefcoilfspringfU land not transmitted lto -the -Qperator who V-graspsV-the handle T. However the arrangement lo-,thealbove mentioned cushion handle forms a subject inpatter ofemygapplication orpatent, Serial No. -669,036; `=iled, September 11, `1923, =and further description here is deemed unnecessary.

-In accordance with vthis invention -a Vsleeve W 'ispreferably securedto the fliqui'd yconvductingtube inany suitable' manner. The liquid conducting tube in thisfinstanceextendsfthrough-V--the rifle lbaiyhead LVril'e bar `O,piston E, Iand a `short distance finto the,

hollow bore of the drillsteel Ill-and is :for the purpose of 'conveying liquid, Such as -Water,finto the drill steel D for cleansing the drilled-hole oi-the cuttin-gs. The sleeve W is preferably formed With'a-threade'd end` portion rY Whi'chfis adapted to beserewed into the recess -Zefornied in la `back head Plugw- Y A VAp tapered-portion -b is formed yon the sleeve and is -adapted,towcooperatepy vvfith a Y v-:tapered seat c orrned -,in theyback'head Splug l a for dori-ning Jva Vfluid tight .connect-ion bertweenthe `fsleeveV MT and thebaclg Aheaelf` plugin.

The backl headV plujg fw fis \i n ;this' instance formed "withga @tapered portiond v vhichfis wafdapted to feoop'erate with -a tapered fseatj e ff'oifnied :filrthe back-head@ for #for-ming a iuifd tight? connection between: the baokhead plugafgand the back head -Jy Anv annular ygrooveff is fin :this instancejY-ermedsinlthe 4tajperelportion d of fthefbaekihead )plug a Sand communicates with fithefreeess :Z Aby meanS-foffalimssggeig-V Qlhe ld is Y I Aapreiferably {liter-ined wlth an 1,111.6@ opweg Z which ,is adapted 'to v0 formedinithe back head J which serves 4to holdtheplug a inposition relative to the` 'back head.l u u The back head ,plug Aa is vpreferably formed with a stem Kv ichflies inthe `holloWboi-e'oflthe back "head" extension ,R and fis in this instance `formed "with a head q which is provided With adiagonal "hole r Y'iior'the receptionof as uitable tool,-such as a nail o1wvi1e,t`o enableth'e.back head plug a to fbe unscrewed yfrom the back "head U so that the liquid conducting -tube X Vmay be Areadily removed from .the umachine. `The sleeve LW is @preferably formed4 with an y extensionlsliavi-ng Iiattened .portions t on opposite. vsides thereof 4andalpair offlugs Awis preferably formed inran iipriglitgposition on thefba'ckheadd. Y y i A lThe iiattened ,portions t, of the "sleeve 'are .adaptedj'to @be inserted between the lugs fu gasishown'vin Figure 4 and :by applying a :fsuitable f tool, suchas 'a fivrench, tothe stern gp orheadg of a backheadplug @,'theback head plug linay be separated `or removed fitr-om the -tube X .andf sleeve l. :In this "manne-r the .necessity df `2.a special tool or tools forremovingthe back iheadQplug :tem the-liquid conducting tube isdlspensed with andthe vflugs 'u vserve'as :a viseifor holding the sleeve `against irotation while the "back '-hea'd vlug ris :removed (therefrom. V

y .Infthe y"mofdiiicaitiony'shown yin Figure f5, thefwa'ter 'tube yconllection Vis illustrated as applied to a rock drill of the driiter type, in which Lplug nlV `is of cylindrical `shape Vand adaptedrtobe screwedinto f theloaekheadd of the.machine.` .Thegliqiiid fcoductingV tube is gproyided with "the sleeve NV having fthettapered @portion b and is infvot'her respectslike'the sleeveilV shown V:in Figure l. The wa-ter Ventr-gifsy the .tube

-through the Ainlet X and passes through `the lpa-sdsagefU in the 'plug l Ytothe tube. l This modified constructionfshown in Fi luref forms `.a simple l.uni-t ary" device adapte to v be applied tostandard rock drills.

.nre ipwhlch'is substantially .like liligurev 5,

tbeisleeye VVQisf'inthe form oa-pipe having taperedpipe` threads which are self tightening when the sleeve is ftlireedd im@ the plus d2, This P1P@ plus W is. me@

a recess in 'n-th :further modiiicationshowninFig or otherwise securelyfastened to the water y. tube X;

a back head having a recess and a passage communicatingV with saidrecess into which liquid under pressure is adaped to be introduced, a member screwed into said recess and having a tapered portion ladapted to cooperate with a 'tapered seat in said recess to create af fluid tight connection between Y said member' and .back head, said member being formed with a recess adapted to communicate with the passage in said back head, Va liquid conducting tube extending into said recess, and a sleeve carried'by said tubeyand adapted to be screwed into the recess in said member, said sleeve being formed with a tapered portion adapted to cooperate with a tapered seat in said member for creating a fluid tight connection between said sleeve and member.

2. In a rock drill, the combination of a back head having a recess and a passage communicating with said recess into which liquid under pressure is adapted to be introduced, a back head plug adapted t0 be screwed into the recess in said back head and having a 'tapered portion adapted to cooperate with a tapered seat in said recess to form a fluid tight connection between said plug and back head, said plug being formed with a recess communicating with the passage in said back head, a liquid conducting tube adapted to extend into the recess in said plug, and a sleeve. carried by said tube adapted to be screwed into said plug, said sleeve being formed witha tapered portion adapted to cooperate with a tapered seat in said plug for forming a fluid tight connection between said sleeve and lu p In` a rock drill, the combination 0f a back head having a recess and a passage communicating with said recess through which liquid under pressure is adapted to be forced, a member removably secured in said recess and having a tapered portion adapted to cooperate with a tapered seat in said recess to form a fluid tight connection between said back head and member,

saidV member being formed with a recess adapted to lcommunicate with the passage in saidvback head the inner end of said recess being tapered, a liquid conducting tube a fluid tight connection between the inner tapered portion of said member and the Vtapered portion of said sleeve, and means 'carried `by said member adapted to enable said member' and tube to be removed from saidback head. p

4. In a rock drill, the combination of a back head having a recess and a passage communicating with said recess into which liquid under pressure is adapted tobe in troduced, a back head plug adapted to be screwed into the recess in said back head and having a tapered portion adapted t0 cooperate with a tapered seat in said recess to form a fiuid tight connection between said plug and back head, said plug being formed with a recess communicating withl the passage in said back head, a liquid conducting tube adapted to extend into the recessin said plug, a sleeve carried by said tube adapted to be screwed .into said plug,-said sleeve being formed with a tapered portion adapt,- ed to cooperate with a tapered seat in said plug for forming a fluid tight connection between said sleeve and plug, and a stem car ried by said .plug adapted to enable said plug, tube and sleeve to be removed from said back head as a unit.

5. In a rock drill, the combination of a back head having a passage into which liquid is adapted to be introduced, a back head plug removably secured to said back head and having a recess adapted to communicate with said passage, the inner end of said recess being tapered, a liquid conducting tube, a tapered sleeve having a threaded portion carried by said tube for removably securing said tube in said plug the tapered portions of the sleeve and the recess in the plug cooperating to form a seal and means on said sleeve to enable said sleeve and tube to be removed from said plug.

6. In a rock drill, the combination of a back head having a recess and a passage comunicating with said recess into which liquid is adapted to be introduced, a back head plug having a recess communicating with said passage andadapted to be screwed into said back head, said plug being formed with a tapered portion adapted to cooperate with a tapered seat in said back head for formt ing a fluid tight connect-ion'between said plug and back head, a liquid conducting tube adapted to extend into the recess in said plug, a sleeve carried by said tube and adapted to be screwed into said plug, said sleeve being formed with a tapered portion adapted to cooperate with a tapered seat in said plug for forming a fluid tight connection between said sleeve and plug, and means on said sleeve for enabling said sleeve to be separated from said plug.

7. In a rock drill, the combination of a back head having a recess and a passage communicating with said recess into which liquid is adapted to beintroduced, aback Y:lie'advfplug liaifiaig ya recess communicating I cess. insaid plug, said sleeve being formed with a tapered portioiiadapted to cooperate Witlia tapered seatriiifsaidgplug for forming a fluid `tight :connection Abetween ysaid sleeve andrpluggand liattened portions ormedon saidfs'leeife to I'eria-ble said sleeve to bejse'parated from fsaid plug. f

8. Ina rock du'illg the combination-of a back head having-a recessand apassage in commuiiicatio lWitlrsai'd recess into which )liquidr under pressure 1s adapted to be uitroduced, la' `:back 'head Vplug havinga'recess "adapted fto-coriimliiiiiciite l-Wicli said passage and also adaptedto be screwed into the recess in said back head, said plug being kformed with a tapered-5porigio1iadapted to .cooperateyvitli atap'ered seat in said back headgto giorni va fluid tight connection .be-u' tweeiisaidliplug aud' `back head, 'a `liquid conducting tube adapted :to .extend into tlie recess in said plug, a sleeyesecured to said tube and adapted Vto be screwed into the ,recess iii saidplug, said v`sleeve being formed with u a tapered portion adapted tougcooperate with aapered seatwiii said plug Lo form a fluid vtighft 1 connection between `said plu i and able tool'lfor-eiiabliiig `said plug, sleeve and tube to beremoxfed from saidibaclrhead, and

lliatfceiied fportionsori opposite sides i of a ypor- `tion of said sleeve,toeriablesaidvtube and `sleeve to beseparated from said plug.

'jlnftestimouyrWhereof I have signed this speciiic'ation.y A i w "JLAMPRELLWITZ

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