US866953A - Screw-threading machine. - Google Patents

Description

v110,866,953. PATBNTED SEPTL'QLL- 1907.

E'. H. MOLAIN. SCREW THREADING MACHINE.

AFPIiIOATION FILED PBJT. 1906.

a SHEETS-SHEET 1.

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PATENTED SEPT. 24, 1907.

P H McLAIN SCREW THREADING MACHINE. VAPPLIOATION FILED un. 27. 19'06.

6 SHEETS-SHEET 2.

xnew'NTED SEPT. 24, 1907.

F. H. MGLAIN.

SCREW THREADING MACHINE.

APPLICATION IILBD APB.27,1906.

6 SHEETS-SHEET ,3.

-NVENTOH Evan/76H Marn 'ay m4n/U V60 A TTOH/VE YS w/rNEssEs- H No'. 866,953. PATBNTBD slPT. 24, 1907.

F. H. MULAIN. A

SCREW THRBADINGMAGHINB.

APPLICATION FILED A'PB..27, 1906.

' 6 SHEETS-SHBET 4,

TEL@- ING. 866,953. EATENTED SEPT. 251907.

.E. E. MOLAIN. SCREW lTEEEADIEG MACHINE.

APPLroATIoN FILED 211.27, 190e.

e SHEETS-'SHEET s.

y ATTORNEYS No. 866,953. v v 1ATB1\T'1ED SEPT. 24, 1907.

F. H. Mo-LAIN. -j

SCREW TH'READING MACHINE.

APPLIUATION FILED 21.27, 190e. I

' e SHEETS-SHEET e.

A TTOHNEYS Tri all it may concern? n engins-#Pagani OFFICE;

soanw-Trrnnsnms :MAoHINn cit the United Statea'and a resident of Stratton,

boxes, but canbe -used with` advantage Wherever ,a threading machine of 'this characteris desired'.

The 'objects of the inventionv are to construct' a pracl.

mfg-he County ofy Franklin @ad state f Maine, 'have inherited a new and Improved :Screwf'lflireadinglMa chine, vo'ivzhich Athe following is a full, 'cl`ear,' an d exact descriptionj- I f lhis invention is'an` improvement-jin screwthreading machines more especially designed toA cut` theA eX- termal and internal threads on screw threaded wooden tial threading machine which shall be automatic iny its 'actionof feeding 'wooden boxes and covers vor other blanks: f

the part' of the' operator' than' simply plac`- ing .the boxe'sin the receptacle. l 'N i labor and' 'only one operator required to operate two or "more. machines',- thereby -considerabl'y reducing then -in y'n uachines 'in which-,the y,foregng operations' or cost incident to the threadingoperationg .y

The machine isalso capable o i beingrapidly operated' to turn' out better and more. uniform w'ork than part of them, arepeiiormed by hand.

to thread different sized Aboites and covers, by insert-` -jing albushingfin the'spidleapd'makig minor ad.

i v@length ofbox or cover to be threaded, j

Theaboveobjects are accomplished' inventioiifj one" embodiment of which is hereinafter disclosed theieren'ce is' to' be had to thlaccoinpanying .drawl ings forming a part of this specification, i'nvx'vhich similarl characters di reference indicate f corresponding paris in all the figures.'y

- Figure lis a front elevationof the miente with the legs 'andifeeding' 'chute partly broken away.; Fig. is

a plan viewthe machine complete; Fig.y 3' is a back f "e'nd elevation of the; iiiailiine;'.'/Fig'.` 4 isfa transverse, vertical seuofiloftheiih f Fig. iiqbking in' i Specification of Lettersfratent.

justmn't of 'the ejectorrod "tocorrespondjwith theA 19o serial 110.313.944;

-forced'by Atransverse beams 3 and 4 connecting the legs'of each pair, and longitudinalbeams 5 connecting, respectively, thebaCk and frontlegsrof the machin'e. This part of the machine striicture constitutes the machine,fra/me. Journaled the beams 4 is 'a main driviligshafty 6 having a largegear 7 journaled` thereon4 near .oneend of the shaft, 'said' gear meshing counterfshaft 9 also vcarries a pulley 10 fixed to it at fthe outside oi the machine frame, and is, journalod in a bearing in the transverse beam 3.

Bolted` or otherwise secured Ato the bed of the mamade up of a cylinder 14 having an enlarged' bore 15 anda 'reduced .back ,end portion 16v withy a correspondchuck is a spring wire 23attached by screws 24,and bent toward the center of the chuck with an upwardly turned end providing resilientmeans'coperating with the jaws for holding the work.'` The jaws are operated manner, ,'by;'revolvinga spirally threaded ring 25'l by -means of a .band 2 5 revolubly mounted on the head 22. The'band25 consists of 2a, strap with the ends brought Vf ,ogether and riveted, providing'a projection 26 and is `ferential slot inthe head. 1 Forrotating the spindle, a smalllong pinion- 28tis fixed on` its reduced end 16 by a set bolt 29, and meshes .witli'alarge'gear 30 fixed to an intermediate shaft 31 ,fjouiiialed inbearingsSZ .carriedat the i1pp.c1 end ofn.

vpivoted at abircation iripthe4 lowerexid of the barconn'ected at, its opposite end 4to a crank estantes sepa 24, i907.

"a bearing box 11 supported from the front beam 5 and' chine nearone end, are supports 12, 12 with journal, lboxes '1 3 carried` at, their upperv ends f or rotatablyl se-l curing a 'hollowspindle in place, said spindle being Aingly'reduced bore 17. This spindle is more clearly shown `in detail in Fig.` 6.' .The cylinder 14 is cut with an `opening ladapted and 11said chuck being ofuniversal construction andcomprising jaws 21 traveling in radial grooves inthe face of a chuck head Fixed to each yjawfof the,

simultaneously tofcenter the Work, in a well known securedto thering 25a at therear of the headby a set screw V27 `Apt tssing throughthe strap and into a cicnm-, l

with a smaller gear Siixed to a counter-shaft 9. The

supportsassid support being fixed to se machins -bedi` llhe intermediate shaftl 31y is driven' by'a. pinion I34' ired'to it, meshing with a -rackbm 35 reciprocating v between' ton'glied guides 36 secured to the bed'oftheA machine. This rack barisfreciprocatedbya link 37'. Y

` fixed at the outer end of the-shait 6L-4 It is evident from in lonev direction as the rack bar moves upwardly,'and f a cam 76, provided with a cam-groove 77 in which a I- roller 78 ljournaled at the end of an arin T9. is adapted the same number of revolutions in the opposite direction as the rack bar completes its return movement.

The spindle is adapted to be uniformly reciprocated v back and forth as it is alternately revolved in each direction, by a screw 4l'adjacent to the pinion 28 secured to the reduced end 16 by a screw 42. Said screw 41 is threaded through a nut 43 stationarily held on a sup- 'port 44 secured to the machine bed. The pitch of the threads on the screw and nut is the same as that revquired. for the work.

given a combined rotary and reciprocatory movement, is a cutter wheel/15 adjustably secured by a set screw 46 in the socket of a short shaft 47, said shaft having fixed thereto a pulley 48 and journaled at each side i thereof 'inbearings 48 in an enlarged upper end of aA below the shaft 6, where itis engaged by a cam 51 adjustably 'xed to the shaft 6 by a yset bolt 52, the cam causing said lever to oscillate on its pivotal connection l 53 carried on a bracket '54 secured to the 'back longitudinal beam 5. The cam 51 is so positioned on the shaft 6 that when the rack bar 5 starts on its upward movement to rotate thechuc'k 'toward the operator, it will throw the lever 49 inward'and bring the cutter wheel vin contact with the work while saidwheel is rapidly revolved from some suitable source of power, by a belt passing about the pulley 48B. When the enlarged portion of the cam has passed from the lower `end of the lever 49, the lever and its attached mechanism are auspring 55 attached to one end of the lever and to some fixed portion of the machine, as, for example, asshown at 56, in Fig. 5.

.bottom of a `chute 58 for lfe'eding'the -ola-nksto 'the 'cylinder. This chute is best shownl in Figs. land 4, and consists of side'portions 59 attached to the bottom 58,

with a plate 60 fastened tothe sides by means 015I screws 61 providing a 'top for the chute, and an vexteriion 62' secured by screws 63 providing an auxiliaryho'l'der for .the blanks. A y

The bottom of the chute is closed 'bya wire plate 64 horizontally attached to 'theend of ari/inclined -lever 'below the pivotal connection, as shown'in Fig. 4,

curves about the front of the shaft 6, terminating in a bottom of the chute. The plate and lever are automatically returned to a normal position b'y Aa spring 74, having one end attached to the lever and its oppo site end attached to some fixed portion of the machine.

Adjustably secured to the shaft 6 by a set bolt 75, is

to'travel, see Fig. 1, said arm, asbest shown in lhg. 3. is adjustably fixed by a set bolt to a shaft 81 jonrnaled at each side of the machine. Near the roerend of the shaft 81 is `aatljustably fixed by a set bolt 82. nn arm 83 pivotally attached at its upper end to a link 84. see 1. This link 84 passes outwardly at the und of the machine between two plates constituting the lower end o-a lever 85, the two'plates being separated a distance substantially equal to the thickness of the For cuttingv the thread on the work as the chuck is link 84, by a` third plate having a projection engaging a 'recess in the outer end of the link, as shown in dotted i lines at 86 in 1. The lever 85 is adjustably pivoted ina slotted bracket 87 secured to one end of thi.- machine, and is connected at its lower end to the link 84 by a tension spring 88. The upper end of the lever is bifurca-Led at 89 for receiving the end of a screw 90 passing through' ablock 91, said block being sccin vil to the outer end -of -an ejecting rod 92 passing into and fitting the bore 17 of lthe spindle.

Secured' to the driving shaft 6 intermediate the pinion 7 and arm 72, is a beveled pinion 93 meshing with a similar pinion 94 fixed to the lower end of a vertical shaft 95, said shaft passing 'upwardly through the bed of the machine to about the 'height of the longitudinal center lo ythe machine spindle. yThe shaft 95 is jonrnaled in the machine bed and held from longitudinal movement by adjustable collars 96. The extreme upper 'end ofthe sha'it is slotted to permit the pivotal connection'o ai11arm'97, by'a pin'98. This arm is normally held inward against the head 99 of a revcrscly curved non roo by a spring ioi Surrounding nissan and pressing yon the under face of lthe arm 97 and amr'ojection 102 extending from the shaft 95, to whic.. the bolt is attached. 'Directly below the arm 97 is rigidly and adjustably attached an arm 103 to the Fixed at an incline of about 60 degrees 'to the 'bed of the machine, and passing closely to the cylinder`14'adi jacent Ito the opening 18, are-supports 57 carrying the shaft 95, l'by a set bolt 104, said arm being for a purpose hereinafter made apparent.

For connecting the `gear 7 to the driving shaft 6 when desired -to `set the machine in operation, is a lover 105 pivoted lto the frame at 106, having a handle l0? projecting above the machine bed, and adapted to reciprocate a male clutch member 108 splined on the shait 6 to engage and disengage said clutch member with a female clutch member 109 forming the huh of the gear 7.

Assuming the parts of the machine in the relation j shown in Fig. 1, with the chute supplied with blanks 65 passing downwardly 'from an 'opening 66 tlre machine bed, and lis adjustably pivoted in a slotted bracket 67 by a p'ivot bolt '68. The end ofthis lever i or "boxes `to 'be threaded, uponengaging the clutch membersby throwing 'the lever 105 to the left, the shait'f is rotated, pushing the rack. bar 35 upwardly, by

` means of the intermediate crank arm '39 and link 37. i yThis revolves 'the shaft 31 over from the operator and turns, by means of the intermediate gearing, 'the spindle and chuck in the opposite direction at an increased speed, vfeeding the chuck forward bythe action of the .screw 41 and nut 43. As the chuck begins its forward movement, the yielding arm 97`is revolved by the shafft'95 into the path ofthe projection 26, which rstrikes and 23 are tightened upon the work.

it and momentarily holds the band 25 until the jaws 21 It the engagement 0i' the projection 26 and arm 97 should be longer than sufhcient to tighten the jaws oi the chuck, the spring 101 willl yield to compensate for the undue engagement, and prevent the jaws from being unnecessarily forced on the work, or the breaking oi any of the machine parts. Just as the jaws become tightened on the work, the lever 4 9 is thrown inward by the cam 51 carrying the-cutter 45 which is rapidly revolved by the pulley 48B, to the work and holding the cutter wheel in engagement therewith until the rack bar 35 starts on its downward movement, reversing the direction of rotation and longitudinal travel of the chuck. The cutter wheel is then automatically withdrawn by the spring 55. As the chuck moves backwardly the rigid arm 103 is revolved in the path of the projection 26, withdrawing the chuck jaws from' the workand allowing the work to be ejected. Just as .the rack bar 35 is finishing its downward stroke, the tappet arm contacts with the pin 6 9 on the lever 65, withdrawing the plate 64 from the bottom of thechute and permitting the adjacent blank to drop down in Contact with the cylinder'll.y The plate 64 is then quickly projected 4underneath the chute by the spring 74 to support the remaining blanks. As the rack bar 35 starts on its upward movement, the shaftSl is turned in its bearings by the engagement oi the roller 78 carried by the arm 79, withthe cam in the groove 77 pushing out the link 84 and turning the lever 85 on its pivot and forcing the ejecting rod 92 forward through the cylinder 14. At the moment before theejecting rod moves forward, the blank which has been dropped from the chute, falls into the cylinder from the opening'lS, and is immediately thereafter projected inwardly, pushing the blank out of the chuck which has been threaded, andplacing :an unthreaded blank in itsplace. In practice, l preferably adjust the throw of the lever so that a blank otherithan the one inthe chuck, will always remain in the `cylinder and thereby lessen the travel required for theejecting rodin carrying the blank betweenthe chuck jaws. In the event that the'ejecting rod strikes an obstruction, as for example, a blank binding inthe cylinder, or if the chuck jaws fail to be released for any reason, from the'threaded blank, lthe link 84 will become disengaged from the lever 85 by riding over the projection 8 6 extending the' spring 88, said spring yieldingly pressing the ejector forward and automatically rengaging the lever and link when, the movementof the latter is reversed.

l the machine is to be used for threading caps 111,

'asshown in Fig. 9, a cutter wheel somewhat smaller in diameter than the internaldiameter of the cap is placed in the socket of the spindle 47 and the cam 51 adjusted on the shaft 6 toiprevent the withdrawal o the lever 4 9' bythe spring 55 after thread Nin the cap is cut, until the chuck is carried back sufficiently -to allow 'the cutter to clear the' cap, when the cutter is withdrawn.

blanks of different diameters and lengths, asis obvious. It is also evident, by. adjusting the bolt-40 in the slot 40 of the crank arm 39, the throwof the crank canbe with screws andnuts of greater or1ess pitch when'de -pass in the path of the projection for' operating'saidl closed orrthe same, a projection cnrried1by .t he jaw openjaws, and rigid means adapted to c'operste with said pro;

changed to reciprocate the rack 35 any required travel, 65 which permits the number of threads to be placed on the blank to be changed as desired. It is further evident that the screw 41 and nut 43 can be interchanged sired to change the pitch of the threads as cnt .upon 70 theblank.

The precise embodiment of my inventioniis :not mas terial provided its essential characteristics are'eml ployed as pointed out in the-annexed claims.

Having thusl described my invention 1,claim as'new v75 'and desire to secure by Letters Patents.A

1, The combination of a chuck having a projectionl operable to move the jaws thereof to andl from each other, means for automatically feeding a blank to the chuckf; resilient means co-actng with said projection to close sa,id 80 jaws on the blank, and rigid means co-acting with said projection to-operatesaid j aws to release the blank.

2. The combination of a chuck having a projectiong operable to move fthe jaws thereof to and from each other, means for automatically, feeding a blank to the chuck,-8 5 resilient means movable into the path of said projection... to close said jaws on the blank. and rigid means movable intov the path of the projection for operating said jaws to release the blank.

3. The combination of a chuck having a project i f l 1 .,v 90 operable to move the jaws thereof to and from each other,v means for automatically feeding a blank tothe' chuck, af 'rotatable shaft, resilient means carried by said.sl1a ft,

movable into the path of said projection to close said` jaws' on the blank. means f or automatically cutting a screw- 95 thread on the blank when. held by the chuck, and rigid means carried by said shaft.movable'into the path oi?l said projection for opening said jaws' -and releasing the. blank.

4. rihe combination of a chuck, means rotatable-thereon` for opening and closingr the chuck jaws, means .for` feeding a blank t0 the chuck when tue jaws are open, mea-ns for cutting `a screw thread o the blank when vthe jaws are closed, a projection carried by tthe jaw opening and closing means,A and means adapted to pass in -the path of the projection for operating said opening and closing means l..

5. The combination of a chuck, means rotatable thereon for opening and closing the chu'ck jaws, means for feeding.y s blank to the chuck when the jaws are open, meansjpr automatically cutting a screw thread on the blank when the chuck jaws are closed on `the same, a projection carricd by the jaw opening and closing means, and revoiuble means adapted to pass in thc path. of the projection for operating said opening and closing mea-ns. i 115 6. The combination of a' chuck, means rotatable thereon for opening and closing the chuck jaws, means for feeding a blank to the chuck when the jaws are open,' mean'sff cutting a screw' thread on the blank when Vthe jaws l', closed on the.same,' a projection carried by the jaw open v ing and closing means, said screw-cuttingmeans includingv means for rotating the chuck .and feeding it forward l'as the cutting operation takes place, and means adaptedio opening and closing means. 7. The combination oa chuck, means rotatablethereon for opening and closing the chuck. jaws, means for feeding a' blank to the `chuck when the-jaws are open. means ffory cutting a screw thread'on the blank when tliej'aws are ing and closing means. resilient meansadapted .togcooperatev with said projection for automatically.closingr the jection in opening the jaws. i -J-8..-'1lie combination of a chuck, means rotatable thereon for opening and closingthe chuck jaws. a projection can ried'by the jaw opening and closing means, means for feeding a, blank to the chuck when the jaws are .ope- 11. means for cutting a screw thread on the blank .when the Ajaws are closed, resilient, rotatable means cooperating the projection in automatically closing the jaws. and

.n automaticallyl opening the jaws.

9. The combination oa chuck, means rotatable thereon for opening and closingthe chuck jaws` a projection cai'- ril by the jaw opcuingand closing means. resilient' means adapted to pass` in the' path of the projection to autolmatlcal-ljy' operate the jaws lnone direction, rigid means adapted to pass in the path of the projection for automatically' operating the jaws in the opposite direction. 'sind a rotatable tool adapted to cooperate with the work head by the chuck. I

10. The combination of a chuck, means to automatically reed .a blank thereto, means to automatically clamp the blanlryin the chuck, and means to automatically cut a thread ou the blank when it is clamped, includlng'means to revolve the chuck and means to cause the chuck to travel axially as it revolves. f

1'1. Therornblnation of a chuck, means to automatically feed a blank thereto, means to automatically clamp ne blank in the. chuck, means to automatically cut a bread on the blank when it is clamped, including means i12-cause the chuck to revolve and travel axially in its elution, and means to` automatically uuclamp the blank. f3 1.2. fliie combination of a chuck, means to automatic elly -ecdia blank theretoy means to automatically clamp- Lhc blank in. the chuck, threadfcutting means comprising f means 'to alternately revolve the chuck in opposite directions; meansto cause the chuck to travelaxially as it revel-ves, a cutter, means to automatically apply the cutter to the blank when the chuck is revolving in one direction, and means to automatically Withdraw the A,cutter fromthe blank when the chuck revolves in the opposite direction.

13. The combination of a chuck, means to automaticolly feed a blank thereto, means to automatically clamp the'blank in the chuck, thread-cutting means comprising meanmto alternately revolve the `chuck in opposite directionrn-,mems to cause the chuck to travel axially as it revol-ves,'a cutter, means to automatically apply the cutter to the blank when the 'chuck is revolving in one direction, means-to automatically withdraw the cutter- Whenthe chuck revolves -ln' the' opposite direction, and means' tttautmatically release 'the blank' from the chuck. 14. The l'combination of a chuck, means to automatically cesla blank thereto, means to automatically clamp the blank therein, means to revolve the chuck. means to cause l'ixechnck to travel axially as it revolves, a cutter, means to automatically apply, the cutter to the blank as it ref volves whereby a thread is vcut thereon, and means to automatically reverse the direction of 'rotation of the culter when the thread is'completed.

15.The combination of a chuck, means to automatically feed. a blank thereto, resilient 'means operable to automat cally clamp the blank in the chuck jaws, means to revolve the-chuck, means to cause the chuck to travel axially as it revolves, a cutter, means to automaticallyfapply the cutter tort-he blank as the blank revolves in one direction whereby a'thread -is -cut'thereomfmeans to automatically reverso the direction 'of rotation of .the chuck when the thread is -mimpletedfan'd .means acting at substantially. the same time to automatically withdraw said cutterfrom the blank. '16. {I he combinationof a chuck, means for automatically feeding afblank to the chuck, means for positively driving.

said feeding means, and means for automatically disconmeeting said feeding means' fromv said driving means when the movement ofthe feeding means is obstructed.l

17. The combinationV ofa chuck, means for automatically feeding a blank .to the chuck, means for positively driving said feeding means, means for automatically disconnecting said feeding means from said driving means when the movementof the feeding means is obstructed, and a spring acting to yeldingly press the feeding means against the obstruction-when said feeding meansis disconnected.

18.- The combination of a chuck. means for automatically feeding a blank tothe chuck, means for positively driving said feeding means. means for automatically disconnecting said feeding means from said drivingmeans when the movement othe'feedlng means is obstnuctedand means adjustable means coperating with the projectionA ondoso lor automatically reconnecting the feeding means-with the driving means when the obstruction is removed.

19. The combination of a hollow spindle, means for clampingl a blank carried at one end of the spindle. means for automatically feeding the blank from the spindle into said clamping means. means for positively driving said feeding means. means for automatically disconnecting the feeding means from the driving means when the movement of thtl feeding means is obstructed, and a spring acting to' yieldiugly press the feeding means against the obstruction when said feeding means ls disconnected, said spring acting to reconnect the feeding .means with the driving Imeans when the obstruction is removed.

20. The combination of a hollow spindle, clamping means carried t one end thereof. means to transversely feed blanks into the spindle and project them into the clamping means. means for automatically operating the clamping means for clamping and releasing the blank, revoluble means for cutting a screw thread on the blank while held in clamped rclatff u, and means to alternately revolve the spindle and clam ing means in opposite directions.

lfThe combination of i. hollow spindle, clamping vmeans carried at@ one end hereof, means to transversely feed blanks into the spindle and project them into the clamping means. means to revolve the clamping means and feed it axially as it revolves. a rotary cutter. means for automatically applying the cutter to the blank as it revolves. whereby a screw-thread is cut thereon, and means to automatically release the blank after the screw-thread has been. cut thereon.

22. The .combination of a hollow spindle. clamping means carried at one end thereof, means to transversely feed blanks into the spindle. means to project theAblauks into the clamping means, rotatable means for :1W/umarmally clamping the blanks in and releasing them 1mm the clamping means, and rotatable means to automatically' cut a screw-thread on the blank While held in clamped relatlom 23. The combination of a hollow spindle, clamping means carried atone end thereof, means to transversely feed blanks into the spindle. means to project the blanks into the clamping means. a rotatable shaft having resilient means to automatically clamp the blanks in the clamping means, means .to rotate tue spindle and clamping means and feed the same axially as theyv rotate, a rotatable cutter, means for automatically applying Ythe cutter to the blank as it rotates. whereby a screw-thread is cut thereon, and means carried by said shaft for releasing the blank.

24. The combination of a rotatable hollow=splndle hav-l the bottom ol' the chute, means for reciprocating the plate to discharge a blank into the spindle through said opening, clamping means carried by the spindle, means to project a blank from the spindle into said clamping means, means to automatically clamp the blank in and release it from the clamping means, and means to automatically cut a screw thread on the blank when clamped.

25. The .combination of a'rotatable, hollow spindle,

clamping means carried at one end thereof, screw-threaded meansithe opposite endfof .the Spindle for'feeding the clamping means axially as the spindle rotates, a chute adjacent to the spindle, means operating in the path of the chute for automatically feeding a'blank to the spindle, means for projecting the blank into the clamping means, means for automatically clamping the blank in and releasing it from Vthe clamping means, a rotatable cutter, and means for automatically applying said cutter to the blank while'it is clamped and rotates, whereby a screw thread ls cut thereon.

26. The combination of a rotatable, hollow spindle, a cylinder provided with a transverse opening at anintermediate portiou thereof, clamping means at one end o! the spindle, screw threaded yfemilng means at the opposite end of the spindle, a chute adjacent to the transverse opening in'l'he cylinder, a reciprocating bottom for the chute adapted to admit a blank through the transverse openlng'ot the cylinder. means` to project the blank lntothe clamping means as it is admitted to the cylinder, means 'for automatically `clamping the blank yin and release it from the .clamping means, and rotatable means for cutting a screw thread on the blank. I

27. In a screw threading machine, a hollow spindle rotatably journaled thereon, clamping means carried at one end of the spindle, screw threaded feeding means carried at the opposite end of the spindle, a main driving shaft, a rack bar adapted yto be reciprocated from the driving shaft to alternately rotate the spindlein opposite directions in' its bearings, means for feeding a blank transversely of the v spindle, means for projecting the blank into the clamping means, means to automatically clamp the blank in and re lease it from the clamping means, and rotatable means for cutting the blank.

28. In a screw threading machine, a hollow rotatable spindle, a transverse opening intermediate the spindles length, a chiite adjacent to the transverse opening, clamp! ing means carried at one end of the spindle, feeding means at the opposite end` of the spindle for feeding the same axially in `each direction, means for alternately revolving the spindle in opposite directions, means for permitting the escape of' ablank from the chute to the periphery of the spindle as the spindleis completing 'itsmovement in one direction whereby the blank falls through the transverse opening into the spindle, and means for immediately pro- 4jecting the blank thereafter into the clamping means.

' ing the spindle axially as it revolves, means for alternately revolving the spindle in opposite directions, means vfor permitting the escape of a blank from the chute to the periphery of .the spindle as .the spindle is completing its movement in one direction whereby the blank falls through -the` transverse opening into the spindle, means for immediately 'projecting the blank thereafter to the clamping means, means to automatically clamp the blank in andv release it from the clamping means, a cutter, and means to automat4 lcally apply 'said cutter to the blank after it is clamped.

30. In a screw threading machine, a hollow rotatable spindle, a transverse opening near .its center, a chute adjacent to the transverse opening, clamping means carried at one end of .the spindle, means at the opposite endof the spindle for axially feeding it as itv revolves, means for alternatel'yI revolving the spindle in yopposite directions, means for permitting the escape of a blank from the chute to the diately thereafter projecting the blank to the clamping means, a 'rotatable shaft having a projecting'yieiding arm for lautomatically contacting with means carried by the `clamping means for clamping the blank, a rotatable cutter wheel for cutting a thread on the blank after it is clamped, and a rigid arm projecting from said shaft to release the blank from the clamping means. 1 l

' 31; The combination of a main driving shaft, a spindle alternately driven in 'opposite directions by said shaft, clamping means carried at one end of the 4spindlefmeans for axially feeding the clamping means as it is revolved, a chute adjacent to the spindle, means on the shaft for withdrawing the bottom of the chute to admit a blank to the spindle, independent means to return the bottom back under the chute, means to project theblank into the clamping means, a vertical shaft driven from the main driving shaft, a yielding arm projecting from the upper end of the'.

vertical shaft, vrotatable means on the clamping means to contact withl the yielding arm to clamp the blank, a revoiuble cutter wheel for cutting a screw thread on the blank, and a rigid arm on. the vertical shaft adapted to be contaeted with by said rotatable means on the clamping means, 'for releasing the blank.

32. The combination of a main driving shaft, a clutch 'operated'bya lever for connecting and disconnecting the shaft from the driving means, a spindle alternately driven inv opposite directions by a rack bar .reciprocated by said shaft, clamping means carried at one end of the spindle, screw threaded means for axially feeding the spindle as it is revolved, av chute arranged overV the spindle and discharging therein, means on the shaft for withdrawing the bottom of the chnteto admit a blank to the spindle, independent means to return the bottom back under the chute, a rod reciprocating in the spindle for projecting'the blank into the clamping means, a vertical shaft driven from themain driving shaft, a yielding arm projecting from the upper end' of the vertical shaft, a'rotatable ring, having a `FRANK HERBERT MCLA-IN.

Witnesses:

Jos. C. HOLMAN, Gao. M. Cvnmnn.

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