US948102A - Pipe-threading machine. - Google Patents

Description

D. o. WALTER @L E. L. TROUP.

` PIPE THREADING MACHINE. APPLICATION FILED MAR. 1s, 190s.

Patented Fb. 1, 1910.

r1 SHEETS-sum1.

wmifsssm D. C. WALTER & E.'L. TROUP.

PIPE. THREADINGMACHINE.

'y yAPPLIOMION FILED 111111.18, 1908.

Patented Feb 1 WITN Essig: @gg/mmm,

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D. c. WALTER L E. L. TROUP.

PIPE THRBADING MACHINE.

APPLICATION FILED MARJS, 1908.'

Patented Feb. 1, 1910.

INV'ENTORSf gmgf 7 anims-SHEET a.

wlmsssfs;

D. C. WALTER & E. L. TROUP.

y PIPE THREADING MACHINE. v APPLICATION FILED MAR. 18, 190B.

948,102. 1 Patented Feb.1,`1910.

7 SHEETS-SHEET 4.

WITNESSES: )ia. 'I @NVENQOR'Z Clau SGM.. H @f D. C. WALTER & E. L'. TROU?.

PIPE THRB'ADING MAGHINEL ArPLIoAT1o1z-r1LBD n.118, 190s.

.d w my mm D G WALTER n E L TROUP PIPE THBEADING MACHINE. ArrLIoA'rIol FILED un 18 190s rantedreb. 1, 1910.

'I4 SHEETS-SHEET 6.

,QW c. Wim

INVENTO RS."

D.l C. 'WALTER n E. L; TROUP.

PIPE THBEADING MACHINE. APPLICATION FILED IAB. 18, 1908. e

Patented Feb`.1,`191o 'l SHEETS-SHEET 7.

IH IUI III UMTED STATES. PATENT Y(apla-CE.

DAVID djWaL'rEE ANn'EDwaan L. rnoUi, or roLEDo, omo.

rrPErHnE'AnING MACHINE.

ToV all whom 'it may concern:

and Enwann L. Tnonr, citizens of the United States, residingjat Toledo, in thecounty of Lucas and State of Ohio, have invented certain4 new and useful Improvements in Pipe-' Threading Machines; and we do declare the following to be a full',^clear`, and exact description of the invention, such as `will enable others skilled in the art towhich it ap- -pertains to make and use the same, reference and to'the characters o being .had to the accomfpa-nying drawings,

reference marked f thereon, which form a partofthis specilication.

' vOur inventlon relatestoa machine for threading pipes, bolts, nipples, 4and the like, and is designed to furnish a construction by means of'wlich the-work may be threaded with either a straight or tapered thread and, of any desired taper.

Our machine is also designed to cuteither right or left hand threads.' Also to`insure the -quick and complete withdrawal of the cuttinginstruments from the work at the end ofthe cut, thus permitting and .facilitat- Yand holding the object Vto be threadedin Y exact central alinement with .the die-head which carries the threading tools or chasers.

Ourdevice is also designed to furnish a construction by means of which tlie threading opera-t ion may be performed either with chasing tools or with the ordinary threading die. f

Our machine is likewise intended for use, when desired, as a drill-press.

'We also provide in our machine novel inea-ns forlubricating the Work as the cuttinfr proceeds.

ur invention also relates to certain details of construct-ion hereinafter described and pointed out in the claims.'

Ve attainthese objects by -means of the devices and construction and arrangement of parts hereinafter described and shown, and illustrated in the accompanying drawings, in which,--

Figure I is a central sectional side-elevation of our device; Fig. 2, a side-elevation of .a left-hand lead-screwand nutsfwliiclnwhen. occasion requires, are substituted, for athe `cor:`

Specification of Letters Patent. Applicationled March 18, 1908. Serial No. 421,919.

22,- a front-elevation 'means of connecting- Patentea Een( 1,1910.

responding right-hand part-s shownV in Be it knowirthat we, DAvm- C. WALTER 1;V Fig. 3, a front-end elevation of the die.-

`head of our machine hereinafter referred to;

Fi 4, a central sectional view seen from the rig t and taken on line :v -avFig 3; Fig.

5, a plan-view of the' inner side of one of 'I the plates which governs thedisk which controls the movement of t-lie chasers hereinafter referred to; Fifr. 6, a perspective viewA of the member which connects the plate shown in Fig. 5 with the disk which controls the radial movement off-the' chasers;

Fig. '7, a modiied. form of the late illustrated in Fi 5;.Fig. S, a front-e evation of ourdie-hea in modified forni;` Fig. t), a section .l view-Ondine :v Fig. 8; Iig. 10, a fron -elevation of a die-head showing a modified form of driving mechanism for tlie plate 'which 'controls theV radial movement of the chasers; Fig. 11, a transverse sectional view of the device illustrated in Fig. 10; Fig. 12,.'3. perspective View of the frictional-driving ring for the chaser-controlling disk hereinafter referred to; Fig. 13, a 'rear-elevation of' the Chaser-controlling disk hereinafter referred to, showing its eeceiitric grooves; Fig. 14C, a. plan-viewpl the guide-plate illustrated in'Figs.l 5 and 7, vprovided with means for the adjustment of the length ot the plate and designed 'for varying the point qat' which the chasers are withdrawn from the work; Fig. 15, a sectional elevation of the. same taken on line --m, Fig. 14, showing the plate .upon which it is pivotally supported; Fig. 16, a front-ele'- vation of the supporting'plate last above referred to; Fig. 17, a rear-elevation, partly in A section, taken'on ,line -w, Fig. 18, et the pipe-support and centering device hereinafter referred to; Fig. 18,'a side-elevation of said pipe-support and centering device toether lwith thev pipe-vise hereinafter reerred to, 'saidvise being shown turned upon ort for one end of the its swivel at a right angle to the work, as 'when used Vas'ja sup pipe while placing 1t in' osi'tionto receive the disk or chasers, or uti ized as avise for connecting threaded pipe-sections; Fig. 19,

a 'longitudinal sectional viewof our dieheadrovidedwith a detachable devicejfor threa ing ordinary bolts or rods; Fig. 20,

a. front-.elevation Vof the. sam';f^rFig. 21, a

device adapted for use in drill or drill-chuck; Fig.

showing.- 'a modified the chaser-eontrolling similar; detachable connection with a 1o p of the rear-end disk with-the .guide-plate hereinafter referred to; Fig. 23, a sectional viewofvthe same on line y, Fig. 22; Fig. 24, a sec-- tional view o fa. modi ed form of drivinggear forthe die-head, showing alternative means for actuating the driving-gear either Y by a spur-pinion or by a worm-gear thus heremafter 4re providin A'for 'a considerable diversit of Speed an power; Fi 25, a rear-end e evation of our machine; ig. 26, a side-elevation of our machine, 'on an en` Fig. 27,a topplan View ofthe the drillpress attachment erred to in place, Fi 28, a side-elevation of the oke of the dri l-press lai'ged scale; same, showin attachment, Vhereina terv referred to, Vdetached and Fig. 29 a view of the-ring 28 and the guide-plate 26 ivotally connected therewith, as hereinafter perspective detached eseribed, showing the mannerof adjustably connecting t'he disk 15, hereinafter referred i i to, with the guide-plate 26.

. 6. If-preferred, the gear-wheel 4-may be .formed as an internal -gear engaged by the pinion 3, as illustrated in Fig. 24, and in thisV 'case the gear 4 may be `furnished with an external worm-gear engagedby worm 4a'on a shaft 4" journaled. in a yoke 4, pivoted, as at 4d, and arranged to be thrown' into and out of gear with the worm-wheel at will. This alternative arran ement is provided only whereA the machine 1s to be driven either gitudinally movable in' d secured revo n' lo manuallyjor by power. The shaft 6 is lon-3 I its bearings. The shaft 6 `at its forward end isilanged, as at 7. To the flange is secured the die-head 8 having a hollow hub. 9 bolted, as "at 10, 'to the 'flange 7. In the outer face of the diehead 8 are radial grooves-11 -for the reception of the chasers 12. Each of the cuttersor chasers 12 is provided with a forwardlyy projecting pin or lug 13 which engages an eccentric roove 14 1n the inner face of a circular pate 15. This platey or rin is ro-v tatably secured in place u onthe die-head by means'of overlap in n ers 16 secured. bycscrews to the dieea ee Figs. 8, 10, and 11.) Ify referred, the plate 1-5 may be iibly upon the Vdie-head by means of screw-ring 16 vthe vfingers 16 beingl omitted.

In our-devicefit isnecessary to give the' plate 15 a rotary movement independent of the movement of the die-head in orderto impart to the chasers a radial movement oted, as at 27, upon a plate 28 having a as at 29 (see Fig. 16), which forward part jecting radially vring 17A journaled' t Varms (Figs.

`radially from thelring 17,a v opposite points are lugsor pins 17"-,

through their'connection with the eccentric `grooves 14.V .This we accomplish as follows;

pro- -Y engages the margin of the plate 15, the plate y 15 and the arms' 19 being held in rigid relation bythe set-screws 21. Projecting .radi-V ally from the outer ext-r'emitiesof the arms 19 are ins or lugs-22 upon which are swiveled bi urcated guide-blocks 23 (see Fi 63). The slot of the box 23 engages a gui( e-bar 24 swiveled near4 its center, as at 25, upon plate 26. This'plate is, at its inner end, pivcentral opening, fits loosely upona bearing formed u on the of the forward brac ret B. The pivoted -plate 26Aalso engages a notch 2(3"in the flange or arm 7 of shaft 6, and is thus braced-and given rigidity. One s'ide of the plate 28 rests against a s oulderon the'` bracket B and the plate is held against lateral movement by a'threaded ring 30. Profrom the die-head are lugs or hooks 31 through which pass the plates 26. It will be seen that as the die-head re ol'ves and as it is moved forward upon the bythe lead-screw hereinafter referred to and vby the enga -ement ofthe chasers 'with the thread whici is being cut, the plate V14 is causedto revolve with the die-headby the engagement of the plate 26 with-the lugs 31 and that the tion indepen ent of-the revolving ,die-head.

due to the engagement of the rino' 17 to which it is clamped with the diagona guidebar 24 onthe plate 26. Thislate 26 isheid against forward movementt rough 'pivotal connection 27 with the plate 28 late 15 is given a rotary mowhich, while work it is'free to revolve with the die-head, is held y against forward movementby the ,ring'BO on the forward end of the bracket'B. l, In Figs. 10, 11, and 12 is illustrated a. modified .and preferred form of device for' connecting the eccentrieally slotted 4disk 15v with the guidelate 26, which governs the rotation of the isk l5 inde endentlyA ofthe rotation of the die-head. n this "modified form, theV forwardly rojeeting flange 18,7the ereon and the radial 3 'and 4) are 4dispensed with,

and 'in their stead is employed a frictionband 17, cleft as at 17",. the adjacent ends' of the cleft portion having radial lugs or ears 17e' correspondingly tapped for the recept-ion of a clamping screw 17d.. Projecting at diametrically The ring 17 is adjustahly clamped directly upon .the margin ofthe disk 1.5, vand the pins17e are slidably connectedwviththe guide-bars-24 or equivalent guide-channels or slots formed in the plates-26, as 'above described and illusignited, und with the same effect, as explained y:fifi the last 'preceding paragraph.

g Since the guide-'bar24 is swiveled, as at #25, its angle' to the axis 'of rotation ofthe f plate115 ma Ibe adjusted as may be desired,

thus'eontro ling the Amovement of the plate upon'its bearings andl regulatin the radial' movement of the chasers an 'the' rej sulting taper of the object-to bet-lireaded.

The adjustmentiof the guide-bar 24 is pre- 'served b`y means of a hook 32 formed on the l endof nthe bar and engaging' the end of the and that hence the chasers willv not have plate 2 6 'and having a set-screw by means of which the bar may be secured inany desired adjusted position. By means of the adjustment here described, it will be seen that the-guide-bar 24 may be set and adjusted exactl parallel with the axis of the diehead and' so that' the late 15 will not be given any motion 'at al upon its bearings any radial movement and that the consequentithread formed lwill be straight instead of tapering. The'same result Vmay be' obtained by loosening the set-screws 21 so that the late 15 is disengaged from the control of t e angular guide bar To now insure therotation of the plate 15 in harmony with the die-head we'providc a lock 34 consisting of a cam pivoted -upon a. lug 35' on the die-head and provided with a 'lever 36 by means of which the 'cam 34 may be thrown into binding coi'itact with -the edge ofthe plate 15 thus holding it against independent rotation.

In Fig.' 5 we have shown'thc, swivcled guide-bar 24 arranged to engage the plate 15 through the interposed. bifurcaled block In Fig. 7 is illustrated a modification of this device in which for the bar 24 is substituted a swiveled plate 24 having therein' a channel or-groovc 24". -This'clninnel or groove is engaged bya pin 1 9 'projecting from the extremity of arm .19.. Motion is'communicated to the arm 19 and to the guide-plate 15 bv `the angular channel 24" in the manner above described with refer- -ence to -the guide-bar 24. The channel or groove 24"', at its outer extremity, is deflect..- ed at an abrupt angle, as' shown, the object of this deflection being to give the lug or pin 15)" and the plate 15 a sudden throw by means of which the chasin tools are withdrawn rapidly :and comp etely from they worlg, preparatory to the return ofthe diehead. to its starting )osition.V

A still further mo ificatio'n of the guide- Vplate is illustrated in Figs. l, 14, and 1:5v in which the adjustmentl of the-angle of the guidewhich controls the independe1it.rota tion ofv the late 15,.is predeterminedand fixed, the swiveled adjustable feature of the glpide-bar or guide-slot being omitted. In

ese figures, however, is illustrated a longitudinal adjusti'nent of the guideplate 26.

This' adjustment isolata-ined by formin the plate 26 in two parts .the end of onefo the parts overlapping the other, one of the parts having a slot 26 through which asses 'a bolt 26? engaging the other part an having a set-nut-261, the arrangement being such that one of 'the plates may be sli pcd length wise upon the Yother andsecureci) in adjustedl relation at any desiredpoint. The moving of the guide-plate toward and away from its pivotal support 27-28 permits any desired change, within certainv limits, of the.

length of the thread to be cut and determines the point at which the chasers are withdrawn from the work.

To insureA the forward lmovement of t-he' die-head and chasers upon and into engagement with the work, we connect. to the rear end ofthe hollow'shaft 6 a lead-screw 7, asclearly illustrated in Fig. 1. 38 38 are the two halves of a divided nut adapted to move into and "out of engagement with the leadscrew. 'lhese nut-halves reciprocate toward and away from each other in a housing 39'A .having fianges 40 rigidly `boltedto the bracket B. Projecting rearward-ly from each oftthc nut-halves is a -pin 41' which -lirojects'into an eccentric slot 42 in the flange 43 vof a sleeve 44' journaled upona hearing 45 formed as part of the housing $55). I l'ponthe 'bearing portion ofthe housing 39 is secured a collar 46 which'holds the sleeve 44 operativelysecured upon its bear- Y engaged from the lead-screw, the shaft (t with its die-head may, after the thread has been completed ontlie work, be moved back to its original positionrcady for a new operation. This arrangement .obviates the necessityfor revolving the die-head vin order to screw its back toits original 'position as is usually done. The lead-screw means of a set-screw, 37"\vhich engagesa cylindrical .part .37" formed on the forward is lsecured in place byv end of the lead-screw`and sockcted in a cor- Y responding hole in the end of the shaft G.

In the top of the bracket B\\-'liich.forms the' rear bearing f or the shaft. G is an opening 37 through which tlie/-set'serew 37* may be introduced and removed. This arrangementpermits the convenient removal-and introduction of screws having different leads to accommodate the various dies and the diiterent threads to becut. The divided lead-nut able by first removing the sleeve 44 and'. the collar- 46, (see Fig. 1,) in amanner which will. 'be readily apparent.A A

. is i-n like manner removable and interchange.-

ywhich loosely I It is found desirable to automatically. re-

.lease the divided nut from .the lead-screw and 4to sto the forward movementl of the. die-head (t e instant after the chasers are automatically disengaged from the work as' above described. To accomplish this we pro-- vide a' rod :47 from which projects upwardly a b ar148- having inits upper end a crotch engages a circumferential groove 49-'in1the shaft 6. The bar 4'8-is adjustably secured uponthe threaded end of .the rod 47 between two nuts 50. The rod 47 between two nuts 5 0. The rod47 passes through -and is support-ed in a hole inthe rear bracket B and its rear end projectsinto the path of and forms a detent for adog or aw 3- ofthe sleeve 44. Aroun is'coiled astout spiralspring 53 one end of 'which is secured. to the sleeve 44 the other end. being vsecured to the collar 46.

The tension on the spring is such that it normally' throws the s eeve 44 into such positionthat the divided nut is' disengaged Vfrom the lead-screwv When the shaft. 6 moves longitudinally along the work to such i Y posititoxi that the chasersare disengaged from .the work, 'as above described, the rear end of the rod 4 7 which has moved forward with the shaft 6 now slips out of engagement with the dog orpawl 5l which immediately releases the sleeve 44 and permits the spring 53 to instantly throwthe divided nut out of engagement 'with the leadscrew so that the shaft 6 with its die-head may be now .returned to its original position, either by hand or by any suitable automatic de vice.

l t Iwill be seen by reference to Fig. 3 that the centrallines of the radial grooves in whichy the chasers 12 are moved toward and away lfrom the axis of the cutter-head, form true radu'ofIsuch axis, as 1s illustrated by I 'ment a shearingaction instead of scraping the line y-y, Fig. 3. In practice it is found important to dispose the cutting edges of the .chasers slightly 1n advance of a radial line,

since this largely relieve" the strainupon thecutting instrument and facilitates its action by giving the point of the instruaction. Usually this cut in advance o the radial line is vobtained by placing the larger portion of the chaser, winch is necessarily' of considerable thickness, somewhat back of v the radial line so that its forward edge radiiV of the die-head and we obtain the desiredl cut slightly in advance of the radial line by means of the indentation '12a in the cutting portion of the chaser. When it 'is y is closed the air-conduit i .o perat-iomclosed.-

, To provide forl properly'suppor'ting the pipeor other object'fto vbethreaded and to' lhold the same rigidly and centrally during, thc cutting operatiom-'we .provide a pipedesiredto cut a left hand thread the chaser will havethe indentation 1 2'l formed at its opposite side as indicated' by the dotted lines 12" in Fig? 3:-"Itwil1 be seen that with the'machlnes h'ei'etofore in use,'in which the chasers are not disposed on true'radial lines, i

similar ehasintools'could not .be used vfor cutting both right andl'eft hand threads as,

in urim'proved dcvice.- 'Of course it will be understood that wl1en the left hand chasers here referred toare em loyed a 'corresponding lead-screw'ahd lea -nut-will be employed as illustrated in Fig. '2.1

To insure the proper lubrication of the cutting tools and' `the work as the cuttin -rocess proceeds,live form our die-head ho ow thus forming an oilg'receptacle of large capacity, as illustrated in Fig. The outer wall of' the oil-chamber- 54 has 'a threaded' aperture 55 throu hwhich oil .is supplied to the chamber an which is close a threaded` pin-valve l56 the point of W ich closes an aperture 57 on the lnner periphery of the'die-l1ead. Through the pin-valve 56,

lengthwise, is an air-c onduit58, indicated by "01 dotted lines, leadingfrom the outer end of the valve to the point where -it is seated, as at 59. By slightly unscrewing and withdrawing the valve, the aperture '59 is opened and air is at the same time supplied throu h `the air-inlet 58 so that the vacuum in t e -oil-chamber is broken thuspermittingthe oil to exude upon the work. Then the valve vise 60, (sce Figs. 1v and18,) `h'avln a (zy-' lindrica-l leg 61 swiveled in a socketv ormed in a frame or housing 62'. The viseis verti-v cally adjustable by means of pins and --holes s also, bythe same 63 so -thatthe vise may be made to support a'iny standard size of pipein axial alinement with the die-head. ,It will be seen that' the Y.

vise- 'may be turned horizontally -.upon its swiveled support. and 'that it maybe readil' ladjusted at any desired height. In' addition tothe use here indicated the swiveled' vise is found extremely convenient in `'supi porting one'end of'heavv pipes whenfthey are lifted and swung into placein the machine as well as for other pur oses,-espe' cially in portable machines(V etweenl two brackets 64 springingvfromthe housing '62 is journalcd -a plate `65 having in its margin aserics of segmental notches 66 (seeFig. f 17), vwlnchconform to the outer clrcumfer.-

ence of the standard sizes of ipes. The

tionsV 66 are s axial line of the'shaft and the die-head.

ents coincides with the.

By the rotation of the plate 'the bottoms of 5 the indentations are .brought successively fon bolts and rods. 'Toaccoinplis insert into the circular opening' of the dieinto such'position that the pipe of thecorre-z sponding size will be supported in the notch or indentation in central axial alinement 'with the die-head. The housing or frame '5 62, upon`which the vise and the centering plateG are-mounted, is clamped upon the bedlate of the machine and this housing is a justable, as shown,- toward and away froni the die-head, to furnish alongitudinal lo.. adjustment for .the support'of the different articles to be cut,

' fAs above stated, our machinefis alsode- 'signed for cutting, when necessary, threads 1 this, we

25 which is securedin place by a set-screw 70 or other suitable means. A- bolt secured in thevise 6 0 and presented to the die 69 will be threaded as will be" i eadily understood without further explanation. 'lt will be understood that by obvious manipulation off r l the lead-screw the vise and the longitudif iially movable die-head, :the thread may, if desired,-be`cut u on 'a bolt or rod the (full length of the hol owsliaft 6,

.35 As above stated our machine 'is also de- 'signed to'be employed as a drilling machine. lVlien so employed a collet 71 (see Fig. 2l),

is secured in place as just'described with reference to the collet 67, this collet bein-gpm- *0 vided with means forholding a drill-chuck 72 adapted to receive and to hold'al drill 73.

w lVhen the machine is used for drilling purposes it becomes necessary 'to force the drill forward as the work proceeds. `To accomplishthis there arefornied at opposite sides ofthe rear bearing of the sha-ft 6 `lugs74 (seeFigis. '2G-27,) adapted to'receive hooks 75 on a yoke 7G the central part of which curves back of the endof the lead-screw 37;

At the meet-ing point. of the arms of the yoke is 'a threaded boss or hub '77 through which passes a feed-screw78 carrying at its outer end a handwheel 7 9. The. inner end' ot' the feed-screw enters' a counter-bore 80 "4"." (see Fig. l) in the rear end of the leadscrew 37 and is detachably connected with the lead-screw by means of a cross-pin S1 passing through the o-uter end of the lead- A e screw and engaging a circumferential chan- 60 -nel on the inner end of the feed-screw. The

divided lead-nut being tlirowirout of operative position, the gears 3-4 and the "shaft 6 and die-head being put in motion and the drill 73 beingengaged with the object to l '35 be-.drilled, the drill' is pressed forward asV acter, a shaft, a support upon which ,tile Vshaft is journaled and is longitudinally mojv- 1 tliebore formed by means of the feedscrew and; hand-wheel 7'8-79.. When the' drill-work, is completedit. is the work of but .a moment to detach the drill-press here de-A scribed, together with the drill and its chuck andicollet, Vand the machine isagain ready -for any ofthe other uses herein described,

Having described our invention, whatwe c laini and desire to secure by Letters Pat- 7E l. In a machine of the' described 'charactcr, a fixed support, a shaft journaled 'and longitudinally movable upon `such support, a die-head carried by the shaft, radially disposed chasers inthe die-head, a disk in the s( die-head having eccentric guides 'en aged-.. with the chasers,-the arrangement eing such 'thatthe independent rotation offthe* disk imparts radial movement to the chasers to give ta er to the work, -connections' bef 8.5 tween 'sai disk'and said fixed support, said connections includin a guide which govern's the rotation of -t e disk', and means for l'the angular adjustment of said guideup'on its support. v

2. n 'a machine of the' .described character, a revolublelon itudinally movable shaft, a'die-li'ead carrie by the shaft, 'a fixed support on which/the shaft is journaled,

radially dis osed chasers in the die-head, a disk in theV ie-head having eccentric guides engaged vwith the chasers, a ring mounted andrevoluble upon said fixed sup ort, "a plate connected with'said ring, a gui e u 'on said plateslidabliy7 engaged with said disk, 10c and means `for t @angular adjustment of said guide u'pon'said plate. 3.l In a machine of the described 'character, revoluble llongitudinally movable die-head, a radially 'dis osed chaser in the die-head' thechaser being adapted byitsA radial movement to g'ivetapei' to the work, 7a guide operatively connected with and adapted jto control tlic-'radial movement of the chaser, a support for the guide, pivotal 11'3 connections between theguide and the support which permits the adjustment of the guide' upon the support to vary the taper@ and ,means for securing the guide 4in adjusted position on its support. 115

4. In a machine of the described character, adiehead,la Chaser therein adapted by its radial'. movement to give taper to the work, a guide'operativcly connected with; and adapted to control the radialmovement ,i of the chasei, said guide having a delectionf adapted to accelerate the rzjidialniovementiI of the chaser at the end of its eut, a supportI for the guidewhicli permits the adjustmenfiv of the guide,.to vary the position 'of said 125 deflection, and means for securing theguide in adjusted position on such support. i

` In a machine of the described chartsupport,'an arm carried v the disk andthe guide,

for the longitudinal adjustment of the guide- Yupon the arm.

.the die-head, a ring carried by the arm,

carried by the'arm,

l6. In a machine of the described character, a shaft, a support upon which the shaft is journaled and 1s longitudinally movable, a die-head'carried by and'revoluble with the shaft, radially disposed chasers in thedie-head', a disk in the die-head having ecentriciguides engaged with the chasers and arranged for rotation independently of journaled on the shaft support, an arm carried by the ring, a guide connections between the disk and the guide, and means for the angu-A lar adjustment of said guide .on said arm.

7. In a machine of the character de-l scribed, a rotary die-head, chasers in the die-head adapted by their radial movement tor give taper to the work, a disk having eccentric guides adapted for engagement with the chasers, a friction-band adapted for L ngagelnent'with the margin of said disk, and

meansconnected with thefriction-band for imparting a rotary movement to the disk inl ependently of the rotation of the die-head.

8` In a .machine of the described charthe chasers and radially movable c asers in hsai hea in 'combination with a collet havin in" its peripher apertures which coincide with and receive t e cutting ends of the chasers and having, holding a'tol for cuttin screw-threads.

9. A machine of the ge apho low shaft journaled on the brackets, a gear for revolv-in and nut detachab end of the shaft and adapted to impart a longitudinalmotion to the shaft", a die-head secured to the forward e'nd of the-shaft and having an axial opening corresponding with the open end ofthe hollow shaft, chasers v the die-head, a disk in radially disposed in centrally, means" for operativelyl scribed character com risingl a base 'having upright brackets,

ythe shaft, a lead-screw" y engaged with -the rear acter, a dien-head havin a central o enin and revolublewith the die-head and c a able f ofI rotation independently fof the die-lead, eccentric guides on the' disk' enga ed with the chasers, connections 'interme iate` the disk and the shaft-support, guides on said govern the independ-- ent rotation of the disk, and a work support.

connections adapted to mounted upon the base and adapted toi-1gidlv hold the work in axial alinement-with the hollow shaft.

tures in presence oftwo witnesses. y Y

' DAVID C. WALTER.

y EDWARD L. TROU?. lVitnesses:

.y CLEM'V. Al7VAG1-mR,

ADA E. CAMERON. A

In testimonyfwhereof we afiiir our signa-VV

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