US1094425A - Tapping-machine. - Google Patents

Description

A. W. CASH.

TAPPING MACHINE.

APPLICATION FILED SEPT. 19, 1913.

, 1 094 125 Patented Apr. 28, 1914.

3 SHEETS SHEET 1.

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5] w ueuto'o Mid/M1 141 [aka/ a Patented Apr. 28, 1914.

3 SHEETS-SHEET 2.

A. W. CASH.

TAPPING MACHINE.

APPLICATION FILED SEPT. 19, 1913.

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TAPPING MACHINE.

APPLICATION FILED SEPT. 19, 1913.

Patented Apr. 28, 1914.

3 SHEETS-SHEET 3.

.the fluid 'pre ssure'iiptlie main, a source of of the branch pipe to the outlet of the valve.

citizen of the United States, residing at "the excavation afterbeingapplied. to the main, 'and; means for feeding the cutter -main withiuthe excavation while the mahas the advantage of shortening the-distance .uNrrE STATES P TENT OFFICE.

ART UR w. CASH, or DECATUR, nmnois, ASSIGNQR to H. Mommas MFG. 00., or Daemon,- ILLINOIS, A CORPORATION or rumors".

To all whom it may concern: 1 M -Be it known that I, Airmen W; GAsi'i, a

Decatur, in the county of Macon and State of llli ois, have invented new and useful. Improvements in Tapping.- Ma-chines, of which the following is a specification.

This inventionhas reference-to improvements in tapping machines-21ml more particularlyto that class of machines-which are used for cutting into, and-making branch or other connections with pipes or mains 'un1 (ler'fiuid pressure. The presentii'fi/ention i's-particularly applicabletotapping" machines whereby the main may be cut into and the connectionforined Without the necessity of'shutting oif muchiamioyance and inconvenience to resi-, dents iiithe vicinityfivhereythe cutting opei-ationsearejbeihgi-carried oil-because of a more "or. less prolonged} deprivation of, the gas or water-supplygs the case may be.,, An -object offthisffinvention is to provide means whereby-the machine may be either inanually orpower driven from, the top ofautomatically at a constant rate of'advanceinto workingcontact with the main during the pi'ogress'of the boring operation, inak ing itunnecessary for an attendant to grechine is working. .-:A' further object is to provide means forquickly; applying the cutter to {the main prior to starting the machinei'nto operation. A'further object is; the provision of improved means whereby, the piece of pipe cut from the min by the action of the cutter is arded against falling into the main.

nother objectis toprovide an improved construction'bf valve for shutting ofi: the flow 'oflfiuid after the, openin' has been-cut in the main, and previous to e removal of the cutting mechanism a'nd the connection This improvement consists informing the means foisecuring the-.valve-to the-.main and th valve body inf'one-piece thereby avoiding the necessity; of an extra joint between the valve body and said; meansjwhich Tlirr'mG-mionmn.

- Specification of Letters Patent.

lipnlication tiled September 19, 1913.

to the outer face ofthe' valve, resulting in a similar shortening of the shaft'of the out Serial no. 790,672.

ting mechanism-and the distance which it Patented Am-(28,1914. I

has to travel prior to reaching'i' its cutting position on the main. A further advantage of forming the valve body securing means integrally is that the inlet to the bodyadja- .ccnt'the main may be machined uniformly concentric with the bore of the outer flange of tlie-valve whereby a guide or hearing is provided for the cutter carried on the end of thevshaftof the cutting mechanism, so

that said cutter may be started in' unifornil v correct position and without vibration usu-.

ally caused by commencing the cuttingop eration on the curved or'unevcn surface of the main. It will bealso noted that the bearings thus formed guard the cutteragainst side-wise shifting movement-so that. rchminary piercing of the walls of the niain by pilot drills is avoided thereby ef-m fecting a saving of much time and labor usually spent with this purpose in view and accomplishing aconsequent reduction in the;

tion.- v I A further object is to assemble the workingparts of the machine in. compact form,

permitting its operation in excavations,

smaller than have been required previously inmachine's of this type so that a reduction in the size of the excavation is obtained and a consequent reduction in the exp ense.' In addition the use of the machine on mains in expense of carrying on the tapping opera-.

close proximity to building Walls or other obstructions is made possible, a use not possihle in. machines of less compact construction.

A further object is to provide an gouter casing entirely inclosing all driving inechanism of the machine, thereby preventing gdirt and grit from-falling into the machine, a condition causing excessive friction. with a resultantincrease in power necessaryffor the operation of the machine, as Well as a rapid wearing away and destruction of the driving mechanism. 1 With these and other ob ects in view, the

invention consists in the novel construction a and combination of parts hereinafter more fully described lll' tl preferred form, reference now being made to the accompanying drawings :inwhich,-- I 'Figure ,1 is-x'an elevation ,o f'the tapping IniLClllHQCOHHeCiQd to the main; Fig.- 2- is a lo. gitudinal section of the cutting mechanism. Fig.- 3 is a detaillongitudinal section teeth will thread r "ing mechanism.

'5 ofthe cutter head showing means for pre 'enting the cut-out portion from falling.

Into the main. Fig. 6 is a transversesection on'the line 6-6 of F ig: 2 lookingin the direction of the a'rrow.

Similar (haractersof reference. refer to' similar parts throughout the :severalviews- In the drawings 20 'is the; casing of-the cutting mechanism; formed of two:. hollow cylinders 21 and 22. open,at:each end and connected-totheirinner and outer extreini ties; respectively; tothe worm gear case 2; bly'any suitable means. A screw. cap 24:. closes t outer extremity of ,thecylinder a partof the ca sing 20 has an inwardly curiedportio'n 25, j terniinat-ingdn a.h0llow neck-26 which formson its lIIIIOL Cll'CUIllfQL" ence 'a'hear'ingfin which rotates thelcntte'rshaft 27'. The outer circinnferenceof the neck- 26 forms 'a rigid' shaft on which rotates the'h'ub29pf the worinIg'ear 28. Coupled to the -in'ner extremity of the easing 20 is 'a.- base platBO having a siinilarlyinwardly curved portion 31 'fashioned to form a bearing 32 for the innereiid'of th cutter shaft 27. To provide a'fiuid tight joint around theshaft 27'a'nd kc'ep the fluid pressnre from entering" the cylinders 21 nu-1'22 a gland 4 cap is positioned over and slightly above 35 thebcar'ing 32,*an'd 'fastened to the base plateby ineansof adjustable studs 31-. At somerpoint'nearthe inner end of the shaft .27 is ai-sere-w threaded opening 35'f r the reception of a set screw '36 which securesthe cutter-hub 3'? 'on the shaft. The outer extremity of the cutter huh'is fashioned to form anannular recess 38 serew-threaded to .mesh. wit-Ira similar screw threaded 'mi-tion on the innercircumfereuetirof the cylindrical Gunman. The shaft 27 being hollow :l'rmn'end to end a center combined drill and tap 40' may be inserted in; the lopeninght the lo vermzid of the shaft iii which case the shank of the renterdrill provided with a seat all for-the I'CPCPtlfill of theset sci-(v36 which secures the drill on thesha'ltg, A pluf, 4-2 is expanded tightly into the hollow shaft 27 to prerentlthe fluid under pressure from entering the rear part of the=shaft. if desired the center drill and tapddnnq he dispensed,with its" only funetiim beingto pierce and hold theeirrnla r piece out from f t e main againstfalling \rithin'themain. In this case the cylindrical cutter is providedon its inner circumference with thread cutting teeth see Fig. 5, of. the same lead or pitch as the feeding screw; .44, thereasonfor which will be hereinafter, described. As the boringoperation is being carried on thethe circular pieie 'cut 2:2, forming M from the main and Fig 5-isa detail view 1e open outer end.-of'the easing20.. The

gear-d it against talling intothe main, preventi'ng a stoppage of the pipe.

Th'elshaft 27 is driven by the worm-gear 2S fastened "thereon by suitable lgeys 45 Meshed-witn the face of' the wormgear 28 IS a wor1n46 on a. shaft 47jouri1aled in suitable bearings 4SQformed by an extension of the gear case 23. The shaft; Finlay-be rotated either by a hand; lever coupled directlythereon, but it isfpreferablelt-o .;1'o-' tate the shaft byineans of a flexible jointed shaft 49 which extends 'lo the top of the leX- eavation, thereby reru'lerjing it unnecessary for an attendant to ren1'ain within'the lexeiiration duringthe operation of thema.- cnne. i At its outer esti 'emity the sl1aft 2iiibuts; the hub 50 of the internal'g'ear 51.1Tliis hub is screw threaded to mesh with screw which-rotates in aecntral ope ning 5:3 in the cylinder cap 2% and isprgwiddfat its outer end with a hand "crank 54: Aston L pin 55 engages the crank 54 and preyen'ts the feed screw-fromrotating when the 'cut- .9 ter has been brought into"contactwith ithe outer-surface of'them'a-in." 1 5:

A series vo t gear teeth 56 the shaft- 27' mesh" witlfand' rv 57 keyed on one end ofiftheboinit journaled in suitable bearings'iirthe-housing 5.); On the other end ofthe lt'i't'SS is' 'al" drive pinion G0 meshingwitlr-tlie teethon the internal gear 51 :mdcaushig:itto mine i in 'a direction 'opposite to the shaft, 97. The 190 housing-1'19 encircles .the. endof'the-shziftQT and seats at its lower end in an'ilngulai 'reeessin thesaid shaft and a like recess-in .the hub of the .inte'rnahgear 51filiut'isflii-og euled from rotating therewith by nnansm5 of the spline slidcTway 61 fastened inthe 7: easing 21 theeutire set O'E'Q'Ctll nnd the housing being capable of longitudinalhnn'e menton the slideqvay 61, when ,eithrr the shaft 27 or the screw -14 is revolved;

The valve 62 consists of t "portion 63 and the. sleere'portion' (34 which forms a part of the means foiflsecuriujx the-f yalve around themain. Aeleeve section similar to the sleeve portion of-llie 'ralve'1'15' G2; is assembled on thcoi he main body )posite side of the 9 strips '66 and (flare interposed between the two sleeve sections and machine bolts 68 and Formed in' *thedower, sleeve section 135, are gtooves'TO and 71 in which set tongues 7:; and 73 on the; packing strips. the tongues being somewhat deeper than the grooves so of the groove beforethe sleeve faces'meet and are crushed when themachine bolts 68 and 69 are'tightened, thereby renderingthe joint between'the two sleeve sections impervious l'OJ -fillld. The valve. proper inny 13 0 er sha ft 58 2 5' rrm'm, andsuitahle rubber or leadr'paeking G9 couple the two sections. around the -1n'ain.-

"that they come into contact with thebottonr head of the gate 74, operated by any suitable] messes be of any desired construction but the? present instance is of the reciprocating-f type, having a gate 74 which shuts ofifthe' flow of water from the opening" in tlie main, and a screw threaded steni-TFmesh ing with a screw threaded portion in the' means to open and close' the jvalveI.

The sle'eve section'G-t and the"valv'e body" (33 being integrah the throat or inlet "76 to the valve adjacent the -rnain may bema chined uniformly concentric with the bore 77 of the outer flange of the valve to which the machine is connected, thereby providing a guide or bearingforthehollow cylindrical' cutter carried'on the outer end of the machine shaft. Eucompassing the 'valve inlet 7G and adjacent the main is an annular recess or groove 79 wWlllClJ receives andre-I' talns a. ring or strip 80 of "resilientsor expansiblematerial whereby to form an'iim-l pervious outer surface of the 'mam.

' Another feature of this inventionus-tllej semi-circular formation of theepacltingire oint between the valve body and.

grcov'e'i't) whereby to retain thepackingQO,

in the coupling member 64.

Ieretotorehas been the cnston-ijtoplace member of this c racter upon'thc-nnain and to then pour in the lead or otheranate'rial constituting the packing ring, "but";-;th1,'s-'

method has been founthvery unsatisfactory since the operator tappingthe'main cannot tell whether or not the ring'has been-cast in full. To overcome this difficulty applicant provides a pair of castingsmcmbers 81 and 82, F l

and ,9, which are-placed a gainst the opposite sides of the member (i l,

preferably at the-factory where the-machines are manufactured, and which when' asseu-ibled, as shown in Fig; 8,- constitute a mold for receiving and holding the poured metal in the groove 79 until the metal isset. The member 81 bonforms to the inner cum-a? ture of the member andbears against the inner side of the groove 79, the member 81 being slightly reduced in diameter as compared with the diameter of the opening through the member fat, whereby the cast ring is constructed at its lower side so as to provide for a tight fittmgfconnection between the memberifi and the mair.. The

place by reason of the s nii-.circular formaion of the groove 79. T e ccured by any suit-V means to the outer flange 78' is an a'dapt'er fiange Stf'which'is in turn fastened casing-"20 o the cutting mechanism.

In operationfthevalve body63 and sleeve part 64,-which carries the'cast packing ring 80;is placed-on the-main to beta-pp'ed or cut. into andthe other half '65 ofthe sleeve is assembled on'the' opposite sideof themain, the packing strips 66' and {37' placed between the two sleeve sections with the tongues 72 and 73in the grooves'i'O and 71 respectively, and the machine bolts (38 and 69 tightened to bind the sleeve sections about the main to thus render the joint between the sleeve sections impervious to wateri; Shonld lead packings be used instead'of the rubber paekings (3(3 and 67 all joints should be calked before the machine is bolted to theralve. The valve body (33 having. been thus attached to the main, the cutter 39 is secured to the hub3i" and the latterimounted on the end of a, sha ft- 22.] 'Thejcuttiiig mechanism is now ready for; mounting ion the valve. preparatory to cutting into the -main. .The cutting mechanism isnow'securedto the. valve (33 by means ofthe adapter fia-nge 84, machine bolts being {usually einpmyedfifor this purpose, although any suitable securing means may be substivtutedt-'lhetapplng machineis now in position for 'operationupon the main. This ha v- "ing been-done, the stop pin 55 is pushed out. ofithe path .of the' 'c'mnlchandle 54-v 'and the 'saidcrank handle is rotated thereby rotating the: feed screw 44: without causing the gears -to rotatewhich causes the shaft 27 with the gearson its upper extremity, to more -l.or- Wardly until the cutter 39 comes into contact with the outer Slr'ifilcfl of the main- Then. the stoppin 55 is pulled out into the path of 'the crank handle 54; stopping the rotation of the latter which causes the shaft 27 and the cutter 39 to automatically feed forward as the shaft is driven bythe worm gear 2% and the worm 46; This aulxmiatic forward feed is accomplished by means of the gears journaled in the gear case 53'). 'As the shaft 27 is being rotated by the worm 23,-1110 pinion 57" which meshes with the teeth 56 formed on the upper end of the said shaft will be caused to rotate in a direction opposite to theshafti The drive pinion i0 on the other end df-..th'e counter shaft 58 meshes with the teeth on the internal gear 51 causto the direction of rotation of the shaft 27 forwardly on the feed screw 4% as the cutting operationjs being carried on, it will be smaller diameter than the shaft 27 will cause the screw threaded hub of the internal gear 50 to revol \.'c about the feed screw ll at a less rapid rate than that at which the shaft t fthebase )late 30 on-the lower end of the in g the same to rotate. in a direction opposite 0 thereby causing the cutter shaft to be fed noted that the gears 5,7 and (30 being of a and cutter are revolving thereby causing the 1 theilatter upon therota'tionof the shaft, an

cutter to advance sat-each" revolutio h .an 1 amount considerably less than thejpitch -of the screw threads on the feed screw. In this connection, however, itwill be-necessaryijto regulate the pitch of the thread-cutting teeth:

'43 on "the cutter; 39 for thethreads on the combined drill and tap 40 so that they will advance at the same rate as the, shaft, It

will be observed that by using the reducing gears the necessity of threading the screw to a very finevpitch on the feed screw 44 is avoided, 1

What I claim is 1. In a machine for tapping mains, a cas-. I

ing, a shaft rotating in the casing, a feed screw. revolubly mounted in the outer end of the casing, a locking deviceforthefeed screwto hold the same from turning, a gearingmcmherthreaded to the feed screw and hav ing connection withthe' shaft for-advancin a key mounted longitudinally in the "casing and-engaging said member to hold the same.

. from turningavitli the shaft whereby 'th'e shaft is automaticallyied by its rotation,

said key beingfof 'a'lefngth equalt'othe dis-= tance of travel of'the sliaftfwherebyjsaid: feeding" means" is held irmh aiming 'throughj-\ out theentire length of-1noi-'en1ent o'iithe 2. In: a machine-for tapping iriiiin's',- a-ca's m g, a feed-screw adapted to ,be, held statiom ary n thecaslng, atra nof gears carrled'on" the shaft and engaging sa d feed;serew'and adapted to he turned by the shaft, and a ke'fi' inthecasing engaging said gears to hold the" sm gma turning about the axis of the shaft whereby said shaft is ea by its' ro tation, saidkey extending' longitudinally Withahout thes h aft throughout the I entire 'lfitgth ofitravel of the g; 3. In a device. for tapping-mains, the comhination with' al; shaftgofa butter on the end: of said-shaft, means v:Eor rot'ating said-shaft,

a feed screwextending'into the shaft, a ro-"' tary member threaded on the feed screw andhaving connectioh with the shaft for advancing thesanie' when turned, acrank handle .on

the outer endofthefieed screw for'manually advancing theshaft, and means for holding the crank handle, against revolution upon the operation of said rotating means.

4. In a device of the character described, a casing, ashaft in's'ai dcasing, means for rotating the-shaft,- a cutter on one end of the shafta" feed screw mounted in'the'casing and projecting into the opposite end of the shaft, an internal'gear having a hub thread edupon said feed screw, a gear fixed upon said shaft,;ayframe mounted for rotation uponfthe shaft about :said .-"gear; a counter. shaft mounted-in said frame, gears upon the oppositeends of gthe counter sl'1aft*respecativelyknga'gin said internal 'ga r and said .{gear wh ther-shaft; and an elongated .key 'Iriounted in the' casing longitudinally. of the ishaffiimdfenga'ging said frame to hold the tion o'f'said shaftj internal gear rotates qmtheitfeed'iscrewwto advance said shaft in 1tlie ,a's n'g; "In -te st im oiiy whereof I-have hereunto set .111)? h'andiilzpresen'cbf two subscribing wit LiutTH R w; dis

I Eff Witnesses:

n iee i sa'e'he-eb ihe g a ar 1 61

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