US1155432A

US1155432A - Tap-making machine.

Info

Publication number: US1155432A
Application number: US73538812A
Authority: US
Inventors: Friederich Mueller
Original assignee: Pratt and Whitney Co Inc
Current assignee: Pratt and Whitney Co Inc
Priority date: 1912-12-07
Filing date: 1912-12-07
Publication date: 1915-10-05
Anticipated expiration: 1932-10-05

Description

, F. MULLER. TAP MAKING MACHINE.

APPLICATION FILED DEC. 7. 1912.

1 155432 0 I Patented Oct. 5,1915.

6 SHEETSSHEET I.

Wm v j I gvwenfoz mire c c1 v F- MULLER.

TAP MAKING MACHINE. APPucATlon FILED Me. 7. 1912.

Patented Oct. ,5, 1915.

6 SHEETS-SHEET 2.

23 M $251 Qjfozum F. MULLER. TAP MAKING MACHINE.

APPLICATION HLED DEC. 7. 1912- wwm i r Patented Oct. 5, 1915.

, s sums-sum a.

Q vi bmeooeo F. MULLER.

TAP MAKING MACHINE. APPLICATION FILED DEC. 7. I9 l2 Patented 061;. 5

6 SHEETSfSHEET 4.

F. MULLER.

TAP MAKING MACHINE.

APPLICATION FILED DEC, 7, 1912.

Patented 001;.5,1915.

6 SHEETS-SHEET 5.

I I I F. MULLER.

TAP MAKING MACHINE.

' APPLICATION FILED DEC-7.1912.

Patented Oct. 5, 1915.

6 SHEETS-SHEET 6.

- wi/lmwoeaz $1 Waug who-z xrw 9% 'A/ WM The dnviiti'om consists vi ,nfilllfeeaccompanying1drauldnigs,'iwherein inents of the invention, serve connection *which normally lies inthe path of a lug19 -11 o 'tTED srarns ra'rnnr orr ca FRIEDERICH M'ULLER, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT & WHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A CORBORATION OF NEW JERSEY.

TAP-MAKING MACHINE.

Specification of Letters Patent.

Patented Oct. 5, 1915.

Application filed December 7, 1912. Serial No. 735,388.

To all whom it may concern Be it known that I, FRIEDERICH MtiLLER,

a citizen of the United States, and a resident of Hartford, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Tap-Making Machines, of which the following is a specification.

This invention relates to a machine for performing certain operations'in the manufacture of taps and the like, and more particularly for cutting the threads on tap blanks with great precision and celerity and without requiring the exercise of great care or skill on the part of the operator.

The main objects of the invention are to provide for making automatically a second or finishing cut in a machine of this character whereby great accuracy in the diameter, pitch, and finish of the tap blanks is attained; also to provide for making auto; m atically such a finishing cut in a machine wherein the threads cut in the lands of the tap? anon-concentric with the axis of the tap or t backed off to give proper clearance t'oithe cutting edges of the tap; also to provideofor theimaintenance of an extremely accltratiahd iiniform relative movement betwifeen th'e'l cutting tool and the blank support duir-ingltheeiitire icutting operation to make possibletthelproductiohaof a thread which is accurate as regards tch'i as well as diameter; also toiprdvideitormanying the relative movemeht betweeri: thereuttingtool and the blank slippontazwlreiteliyoithreads10f various pitchesamagy be ipiiotlueedlyhalsoato. provide :IHBbhHIIlSIIBP fOI'i (establishing withrgreat accuracy raminitial predetermined :relatiiin between' 'thee.buttihgn'tbolaa fiil .the iblarrlr istrpcarerbrzskillhoifihesaandrbther objectssof the v inventi on will be in part obvious and. art

A the novel'vime provbmen ts demcspand combinations henes tn disolseflgs-rrmo-no ?no all? no illustrated one of the many possible embodi with the description herein to explain the principles of the invention and one manner of carrying the invention into effect.

Qf the drawings: Figure 1 is a front elevatlon of the machine, certain parts being broken away and shown in section to illustrate the details; Fig. 2 is a similar rear elevation of the machine; Fig. 3 is a plan view'; Fig. 4 is an elevation'of that end of the ma-. chine shown at the left in Fig. 1; Fig. 5 is a vertical transverse section of the machine taken on the line A"B of Fig. 3, certain parts being omitted for the sakeof clearness; Fig. 6 is a vertical longitudinal section taken on the line CD of Fig. 3; Fig. 7 1s a vertical transverse section taken on the line EF of Fig. 3; Fig. 8 is an enlarged view of a'cutter used for threading tap blanks; and Fig. 9 is an end elevationof the same;

Theparticular embodiment of the invention illustrated in the drawings is a machine for simultaneously milling the 'thread grooves in tap blanks. This machine comprises a frame 1 having suitable standards and brackets for supporting the various elements of the machine. The main element of the support forthe tap blanks comprises a hollow spindle 2 having a chuck 3 which is provided with a worm wheel 6 which meshes Witllua worm 7, see Fig.5, on a cross shaft 8.

flihisishaft is driven by means of spiral gears 9 and 10 from a shaft 11 located at the back of'tlie machine and best shown in Fig. 2.

ThBU litreceives motion from a main drivingvshaftifl through a clutch 13.. This clutch is; connected by a rod 14 with a suitableaac'tuating mechanism which, as shown, comprises: an arm L 15: fixed on a rockshaft 16 i suitablyjoiirnaled on the frame. A. handle 4:17 pivotediontliisvrockshaft and is provided with a laterally projecting finger 18 lutions.

finger 18 is normally held in the path of the lug 19 by a spring 22 coiled around the handle 17 and fixed at one end to the handle and at the other end to the rockshaft'lfi. The clutch member 13 is normally pressed toward its operative position by a spring 23 which surrounds the rod 14 and is confined between a collar 24 on this rod and the end of a bushing 25 through which the rod spindle, the collar acting upon levers 5 which passes.

When the handle 17 is actuated to disengage the finger 18 from the lug 19, the clutch will be actuated by its spring 23 to connect the driving mechanism for thespindle 2 with the power shaft 12,-and the spindle will continue to rotate until the lug 19 on the gear 20 engages the finger 18 and disengages the clutch. The rotation of the spindle Will then cease'and will not begin again until the handle '17 is again actuated. It will be seen that by suitably proportioning the gear 20 and pinion 21 the spindle 2' may be given any desired number of revo- In other Words, the number of revolutions of the spindle 2 during each cycle of operation will be predetermined by suitably proportioning the gear 20 and the pinion 21. In the construction shown the gear 20 is twice the diameter of the pinion 21 and hence the spindle 2 will make two revolutions whenever it is started.

To insure the uniform support for the tap blanks against the action of the cutter, it is desirable to support the tap blanks at each end. As above indicated, the tap blank is supported at one end by the spindle 2 and is also rotated by the spindle. Any suitable means may be provided to support the opposite end of the tap blank or that portion which is acted upon by the cutter. It is desirable to support the tap blanks by a tail stock having a dead center adapted to engage the endof the tap blanks. chine of this character, however, it is impossible or inconvenient to make use of the ordinary tail stock because of the fact that the cutter, which is preferably constructed to operate upon the full length of the threaded portion of the tap blanks, or the supporting and driving mechanism for the cutter would be interfered with. In other words, it is necessary or desirable to provide a tail stock which is located at one side of the axis of the tap blanks.

In accordance with one feature of the present invention, this tail stock, which comprises one member of the blank-supporting means,- consists of an arm 30 pivotally mounted on a stud'31 fixed in a carriage 32.

The carriage 32 is adjustably supported upon the frame 1 so that the tail stock may v be moved toward and from the spindle toopposite' end of the cutter is supported on; 13.

In a maaccommodate taps of different lengths and is held in its adjusted position by bolts 33. The arm 30 carrying the dead center 34 is pivotally mounted to permit; the tap blanks erative position by the actuation of a single member. This may be accomplished in various ways. In the embodiment shown the single operating member comprises a lever 35 pivotally mounted on a stud 36 fixed on the carriage 32 and connected by a link 37 to the arm 30. When the arm 30 is moved into its operative position, it is brought up against a stop which serves both to limit its motion toward the chuck 3 and to hold it down or firmly clamp it upon the carriage 32. As shown in Fig. 1, this stop comprises an inclined shoulder 38 in the carriage 31 which is engaged by a correspondingly beveled'projection 39 fixed on the arm 30 by a bolt 40. It will be seen that the lever 35 and link 37 constitute a toggle mechanism by which the arm 30 is moved to and from its operative position and which by the straightening of the toggle is adapted to lock the arm in its operative position with any desired degree of force. For the purpose of limiting the locking movement of the toggle aset screw 41 is provided and to. enable the force with which the toggle acts upon the arm 30 to hold it in its locked position to be properly adjusted, the stud 36 on which the lever 35 is pivoted is provided with an eccentric portion 42 which by the turning of the stud permits of the pivot of the lever being brought into proper relation to the stop shoulder 38 for the arm 30.. The stud is held in its adjusted position by a nut 43,

.for simultaneously cutting a plurality of thread grooves on the tap blanks comprises a milling cutter 45 which, as shown in the enlarged views, Figs. 8 and 9, is provided v with a multiplicity of cutting teeth arranged in circumferential rows 45, the distances betweenwhich rows correspond to the pitch of the thread to be out. As shown, this cutter has a length somewhat greater than the length of thethreads to be out upon the tap blanks butit will be understood that this is not essential.

.The milling cutter may be supported and driven in various ways. As shown, it is mounted at one end on a spindle 46 and is suitably journaled in a bracket 47 adjustably fixed on the cutter carriage 48. The

a dead center 49 carried by an adjustable slide 50 suitably mounted on the carriage 48.

To permit of the cutter being adjusted to and from the axis of the blank, the carriage 48 see Figs. 6 and 7 is mounted to slide on a secondary carriage 51 and is connected thereto by an adjusting screw 52 and a clamp bolt 53, the adjusting screw being provided with the usual hand wheel 54:. To permit of the adjustment of the cutter to bring its axis into exact parallelism with or at any desired angle to the axis of the blank support, the secondary carriage 51 is rotatably mounted upon a third carriage 55 and is adjusted with relation thereto by the set screws 56 and 57, see Fig. 3. When the angular adj ustment has been effected, the

carriages

51 and 55 are securely clamped by a clamp screw 58.

In order that the cutter may be moved away from the blank after the threading operation has been completed and thus facilitate the insertion and removal of the blanks and at the same time make it possible to restore the cutter to a predetermined initial position without disturbing its adjustment, means are provided for effecting a relative separating movement between the cutter and blank supports in a direction normal to the axis of the blank support. This may be effected in various ways. In the embodiment illustrated this relative movement normal to the axis, which is independent of the described adjustment of the cutter, is effected by moving the cutter support with relation to the blank support. To this end, the third carriage 55 is mounted for movement in a direction at right angles to the axis of the blank support in suitable ways formedrin the primary cutter carriage 60, see Figs. 6 and 7. The carriage 55 is normally pressed outward, or in a direction to separate the cutter from the blank, by a spring 61, see Fig. 7, which spring is confined between a shoulder on the carriage 60 and a collar on an' adjusting screw 62 fixed on the carriage 55.. The position of the carriage 55 is determined by a lever 63 pivoted on the carriage 60 and having a short arm which engages a shoulder on the carriage 55 and a long arm which is engaged by a.

connection 64: suitably mounted in a bracket '65 fixedon the frame 1. At its outer end .the' connection 64 is provided with an adjusting screw 66 which is engaged by a lever 67 pivoted on the bracket and arranged to be actuated a cam 68 on a reciprocat ing slide orcam member 69 suitably supported on the bracket 65 and a similar' bracket 70, these brackets also serving as supports for the power shaft 12 and drive shaft 11 previously referred to. The sliding cam member 69 has a limited endwise reciprocating motion and maybe operated in any suitable way. In the embodiment illustrated the member 69 is actuated by a manually operative member which comprises a lever 72, see Fig. 3, this lever being connected to the member 69 by a lever 71. It will be seen that when the cam slide 69 is at its extreme position to the left, as shown in Fig. 3, the lei er 67 will engage the low part of the cam 68 so that the spring 61 will be free to move the carriage 55 in'a direction to separate the cutter from the blank. When, however, the slide 69 is moved to the limit of its stroke in the opposite direction,

the cam 68 will actuate the lever 67 which,

through the connection 64, will actuate the also provided for effecting a relative vibrat-- ing movement between the cutter and blank supports during the cutting operation. In the particular embodiment illustrated this is for the purpose of cutting the thread grooves in the successive lands of the tap blanks progressively deeper or, in other words, to back off the threads of the successive lands. To accomplish this, the cutter support is moved gradually inward dur ing the operation of cutting the threads in each of the lands of a tap blank and is then allowed to return to its initial position before the. threading operation of the nextland begins. In the embodiment illustrated this backingotf vibratory movement of the cutter is effected by a cam 7 5 mounted on a shaft 76 and arranged in coiiperative relation to the lever 63. ,This cam-is given one revolution for each of the lands on the tap blank, there being four revolutions of the cam 75 for each revolution o the spindle 2 in the illustrated embodiment. The operative surface of the cam 75 preferably is concentric for a certain fraction of circumference, say one-fourth, and has a slight uniform increase or radius throughout the re mainer of its circumference, beginning and ending at the notch 75. The purpose of this is to make the lands of the tap circular for a short distance back from the cutting edges, the backed off portions extending from this point to the rear edges of the lands. The notch 7 5 is provided to permit of the separating movement ofthe cutter above described. When the separating movement takes place, the cam-engaging portion of the lever enters this notch;

In order that the machine may be used for cutting tap blanks having various numbers of lands, means are provided for changing the number of rotations of the shaft 76 with reference to each rotation of the spindle 2. To this end, the shaft 76 is connected by a slip joint 77, the purpose-of which will hereafter appear, to a shaft 78. The shaft 78, see Fig. 5, is provided with a worm wheel 79 which is engaged by a worm 80 on a cross shaft 81, see Fig. 3, located adjacent to the cross shaft 8 by which the spindle 2 is driven, these two shafts being connected by change gears, as shown in Fig. 1. This gearing comprises a gear 82 fixed on the shaft 81 meshing with intermediate gear 83 which meshes with a gear 84 fixed on theshaft 8. The speed of the shaft 81 with reference to the shaft 8 may be conveniently varied by removing the gear 84 and substituting others of different sizes, the gear 83 being mounted in an adjusting arm 85 so that the gear 83 may be brought into proper mesh with the gear 8& irrespective of the size of the latter. By giving the gear 84 the proper dimensions the speed of the shaft'81 with reference to the shaft 8 may be so determined as to give the cam 75 any desired number of rotations during each rotation of the spindle 2.

The principal object in causing the tap blank to make a second or third revolution during the operation of threading the blank is to enable the cutter to make a heavy cut during the first revolution of the tapblank and then during the succeeding revolution or revolutions to make a lighter finishing cutor cuts, thereby producing a smoother and more perfectly sized article.- While a second or finishing cut might sometimes be satisfactorily made without advancing the cutter with reference to the blank, it is de stead of operating directly upon the leverv 63 operates upon a secondary lever or ad- .justing arm 86 pivotally mounted on the lever 63' and adjustable thereon by a series of stop members which are successively brought into operation during successive revolutions of the spindle 2. Since in the particular machine shown. in the accompanying drawing the spindle makes two revolutions during each'cycle, there are two of these stops provided for the arm 86. The first of the stops is a set screw 87- which acts as an abutment for the arm 86 Fig. 7 during the first revolution of the spindle. During the second revolution of the. spindle a second stop 88 is brought into the operation to hold the arm 86 somewhat farther in toward the cam 75 so that the latter will move the lever 63 to a somewhat greater distance during each revolution than thereby causing the cutter to be somewhat further advanced uring eaclr vibration than it was during the first revolution of the tap blank. The stop 88 is in the form of a cam which is fixed on a spindle 89. This spindle 89 is connected by a slip joint 89', the purpose of which will presently appear, to a spindle 90 see Figs. 1 and 5, and the spindle 90 is provided with an arm 91 which is connected by a link 92 to a lever 93, and this lever is actuated by a cam 94 carried by the gear 20 previously described. This cam is so formed that during the first revolution of the spindle 2 the stops 88 will be held out of operative position, and during 'the second revolution of the spindle 2 the stop will be held in its operative position,

of the spindle, the adjusting arm 86 being set a little farther in' toward. the cam 75 by each adjustment of the cam 88.

In order that the cutter 45 may cut a proper thread upon the blank, a relative movement parallel to the axis of the tap blank while the latter is being revolved, at a rate corresponding to the pitch of the thread being cut must 'be provided. As far'as certain features of the invention are concerned,

any suitable means may be provided for effecting this or ,a similar feeding movement. In the machine shown this relative feeding movement is efi'ected by moving the cutter support with relation to the blank support which is held against movement in the axial direction. This movement of the cutter support is accomplished by moving the primary cutter carriage 60 above referred to along the ways provided for it in the main frame- 1, as indicated in-Fig. '7. The mechanism by which this movement is effected maybe varied in detail. As shown, this mechanism comprises a transversely moving bar 95 which has an inclined or wedgelike cam face 96 adapted to cooperate with a stationary abutment 97 see Fig. 3. A uniform movement is imparted to this wedge bar during a rotation of the spindle 2 by means of'a train. of gears comprising a. pinion 98 meshing with a rack 98 cut on the bar 95, which pinion is rotated by a worm wheel 99 ar ranged to mesh with a worm 100 carried at one end of a shaft which is suitably journaled in a standard lOl and provided at its opposite end with a gear 102 see Fig. 6. This gear 102 meshes with another gear 103 fixed on a stud shaft journaled in an arm 104:, the stud shaft carrying at its opposite shaft 107, see Fig. 6, which carries at its other end a bevel gear 108 arranged tomesh with a similar gear 109 fixed on the shaft 8 by which the spindle 2 is rotated. It will be seen that the worm 100 in effect constitutes a feed screw bywhich the cutter is given its feeding movement, this movement being rendered extremely accurate. by reason ofthe interposition of the wedgebar between the screw and the cutter carriage. The wedgebar has the effect of reducing or rendering inappreciable any small defects in the feed screw or in the rate at which it is driven.

In order that the longitudinal movement of the cutter may be varied as required to cut threads of different pitches, the rate of.

movement of the wedgebar 95 with reference to the rotation of the spindle 2 is varied; In the embodiment illustrated this is-conveniently accomplished by changing the size of the gear 102, the arm 106 being made adjustable so that the gear 103 may be made to mesh with the gear 102 whatever the size of the latter. I

In order that the cutter may be returned to a predetermined initial "position in the direction of the axis of the blank after the. threadcutting operatibn has been completed, the wedgebar 95 must be returned to its. initial position. To do this the train of gearing by which the wedgebar is driven is first disconnected and then after the wedgebar has been returned, the connection reestablished, In the present embodiment of the invention these operations are effected by the simple actuation of a single member, this preferably being the same member by which the operations of separating the cutter from the blank in a direction normal to its axis and returning the cutter to its initial position in the same way are effected, to-wit, the cam bar 69. To this end, the cam bar 69 is providedwith a cam 110 see Fig. 3 which operates through a lever 111 fulcrumed on a stud-112 to shift the carriage 113 on which the wedgebar 95, pinion 98, and worm wheel 99 are mounted, so as to move the worm Wheel 99 outrof mesh With the feed screw or worm 100. ,This operation occurs during the first part of the movement of the cam bar 69 toward the left as shown in Fig. 3. After the gearing hasi'thus been discbnnected the wedgebar' 95 is restored to its. initial position by a cam 114 on the bar.

69, this cam being arranged to actuate a lever 115 fu'lcrumed on a bracket extension 116 and a'rrangedto engage a pin 117 at the bar 95. This lever is shown in Fig. 3 in the position to which it was moved by the cam 114 when the bar 69 .was moved to the limit of its stroke to the left. As shown in Fig. 3, the bar 69 has been moved back to its initial position, in which position the cam 110 has released the lever 111, and the carriage 113 has been moved back to its initial position by a spring 118 which is confined between the end of the carriage 113 and a shoulder on an adjusting screw supported in the end of a bracket 119. After the bar 95 has beenreturnedto its initial position by the cam 114 and lever 115 during the movement of the bar 69 to the left, the cutter is restored to itsinitial position in the direction of theaxis of the blank, which position is predetermined by the contact of the wedge sur face 96 of the bar 95 with the abutment 97. In the embodiment illustrated this predetermined initial relation between the cutter and blank supports is effected through the operation of the manually operable member 7 2 by a hook 120 carried by the cam member 69, said hook being arranged to engage an arm 121 projecting from the primary cutter carriage 60. The slip joints 77 and 89' previously referred to are provided to permit of the longitudinal movements of the carriage in which the cams and 88 are mounted without disturbing the driving connections for these cams. It may be here noted that the shafts 8.9 and 90 by which the cam 88 is operated are also provided with universal joints, as indicated in Fig. 1, to permit of the swinging movements of the lever 63 on which the cam 88 is mounted. The lever 71 serves to actuate the collar 4: by which the chuck 3 is actuated through a sleeve 122 which is mounted on a stud 123 fixed on the frame, and is connectedon the one hand with the lever 71 by a pin 124 and )on the other hand with the collar 4 by a yoke 125, as clearly shown in-Fig. 1. The

cutter 45 is continuously driven in any suitable way, as from a pulley 126, the shaftof which is connected by universal joints 127, 128 with the spindle 46 of the cutter.

The general operation of the machine may be described as follows; The shank of a i tap blank is slipped into the chuck 3 and its free end brought into engagement with the the chuck 3, to bring the Worm wheel 99 into mesh with the worm 100 through the action of the cam 110 and, throughjthe action of the cam 68 lever .67 connection 64: and lever 63; to bring the cutter intoits predetermined initial operative relation to the blank. The

handle 17 is then actuated to release the clutph-operating mechanism from the lug 19 on the gear 20 and permit the clutch 13 to connect the spindle-driving mechanism with the. power shaft 12. The threading oper ation then proceeds, the heavy or roughing cut being made during the'first revolution of the spindle and the light or finishing cut or cuts being made during the succeeding revolution or revolutions of the spindle, this operationcontinuing until the lug 19 on the gear 20 engages the arm 18 of the clutchoperating mechanism and disengages the clutch 13. The operator then moves the hand lever 72 to the limit of its movement opposite that shown in Fig. 3. This results in the following operations: First, the collar 4 is actuated through the lever 71 and connection 122 to open the chuck 3 and release the tap blank, second, the cam 110 is actuated through the lever 71 and cam bar 69 to disengage the worm wheel 99 from the worm 110; third, the bar 95 is returned to its initial position through the action of the cam 114 and lever 115; fourth, the cam 68 is retracted to release the lever 67 and permit the spring 61to move the cutter out of operative position; and, finally, ust at the end of this movement of the cam bar 69 the hook 20 operates through the arm 121 to return the primary cutter carriage 60 toits initial position predetermined by the contact of the cam bar 95 with the abutment 97. The tail stock lever is then actuated to release the tap blank and permit its removal. Another tap blank is then put in position and the above described operations repeated. It will be seen that with this machine all that is required of the operator is simply to move the two levers 35 and 72 to the lim t of their motion in one direction, when the spindle automatically stops rotating, replace the threaded blank by another blank,- return the levers 35 and 72 to their initial positions, and then trip the chuck releasing lever 17. There is no operation that requires the eXercise of special care or skill.

The invention in its broader aspects-is not limited to the particular construction shown nor to any particular construction by which it has been or maybe carried out, since various changes may be made in the details'of the mechanism without departing from the main principles of the invention and without sacrificing its chief advantages.

I claim:

1. A machine for threading taps comprising a revolving cutter, blank supporting and rotating means; means for causing the cutter to take a roughing cut from the blank durmg one revolution thereof; and automatic means for advancing the cutter at theaction at a determinate time in the rotation of theblank for taking a finishing cut during another rotation.

3. A machine for threading taps and the like, said machine including in combination, a blank support, means for simultaneously cutting a plurality of thread grooves on the blanks, mechanism for rotating each blank through a predetermined number of revolutions, mechanism for effecting a relative movement between the blank support and the cutter in the direction of the axis of the blank, said movement being of such rate as to produce the desired witch of the thread, and mechanism for e ecting a predetermined relative advancing movement between the blank support and the cutter, said advancing novelnent occurring substantially between consecutive revolutions of the blank.

4. A machine for threading taps and the like, said machine including in combination,

' a blank support, means for simultaneously pitch of the thread, and mechanism for effecti-ng a predetermined'relative advancing movement between the blank support and the cutter, said advancing movement occurring substantially between consecutive revolutions of the blank.

5. A machine for threading taps and, the like, said machine including in combination, a blank support, means for simultaneously cutting a plurality of thread grooves on the blanks, mechanism for rotating each blank through a predetermined number of revolutions, mechanism for effecting a relative movement between the blank support and the cutter in the direction of the axis of the blank, said movement being of such rate as to produce the desired pitch of the thread, mechanism for effecting a predetermined number of vibrating movements between the blank support and the cutter during each revolution of the blank, and mechanism for effecting a predetermined relative advanc. ing movement between the blank support and the cutter, said advancing movement 00- curring substantially between consecutive revolutions of the blank. I

6. A machine for threading taps and the like, said machine including in combination,

a blank support, means for simultaneously cutting. a plurality of thread grooves on the blanks, mechanism for rotating each blank through a predetermined number of revolutions, mechanism for efi'ecting a relative movement between the blank support and the cutter in the direction of the axis of the blank, said movement being of such rateas to produce the desired pitch of the thread, and mechanism for separating the blank support and cutter after the rotation of the blank has ceased.

7. A machine for threading taps and the like, said machine including in combination, a blank support, means for simultaneously cutting a plurality of thread grooves on the.

blanks, mechanism for rotating each blank through a predetermined number of revolutions, mechanism for effecting a relative movement between the blank support and the cutter in the direction of the axis of the blank, said movement being of such rate as through a predetermined number of revolutions, mechanism for effecting a relative movement between the blank support and the cutter in the direction ofthe axis of the blank, said movement being of such rate as to produce the desired pitch of the thread, mechanism for efl'ecting a' predetermined number of vibrating movements between the blank support and the cutter during each revolution of the blank, mechanism for effecting a predetermined relative advancing movement between the blank support and the cutter, said advancing movement occurring substantially between consecutive revolutions of the blank, and mechanism for separating the blank support and cutter after the rotation of the blank has ceased, and mechanism for establishing a predetermined initial relat on between the blank support and cutter.

9. A machine for threading taps and the.

like, said machine including in combination, a blank support, means for simultaneously cutting a plurality of-thread grooves on the blanks, mechanism for rotating each blank through a predetermined numberof'revolutions, mechanism for effecting a relative movement between the blank support and the cutter in the direction of the axis of the blank, said movement being of such rate as to produce the desired pitch of the thread, mechanism for separating the blank support and cutter after the. rotation of the blank has ceased, mechanism for establishing a predetermined intitial relation between the blank support and cutter, and a. manually operable member for operating said separating and initial relation mechanisms.

10. A machine for threading taps and-the like, said machine including in combination,

a blank support, means for simultaneously cutting a plurality of-thread grooves on the blanks, mechanism for rotating each blank through a predetermined number of revolutions, mechanism for effecting a relative movement between the blank support and the cutter in the direction of the axis of the blank, said movement being of such rate as to produce the desired pitch of the thread, mechanism for effecting a predetermined number of vibrating movements between the blank support and the cutter during each revolution of the blank, mechanism for effecting a predetermined relative advancing movement between the blank support and the cutter, said advancing movement occurring substantially between consecutive revolutions of the blank, mechanism for separating the blank support and cutter after the rotation of the blank has ceased, mechanism for establishing a predetermined initial relation between the blank support and cutter, and a manually operable member for operating said separating and initial relation mechanisms.

11. A machine for threading taps and the like, said machine including in combination,

a blank support, means for simultaneously cutting a plurality of thread grooves on the blanks, mechanism for rotating eachblank through a predetermined number of revolutions, mechanism for efiecting a relative movement between the blank support and the cutter in the direction of the axis of the blank, said movement being of such rate as to produce the desired pitch of the thread, mechanism for effecting a relative movement between'the blank support and the cutter in a direction transverse to the axis of the blank, and mechanism for controlling said relative, movement mechanisms and estab lishing a predetermined initial relation between the blank support and the cutter after the rotation of the blank has ceased.

12; A machine for threading taps and the like, said machine including in combination, a blank support, means for simultaneously cutting a plurality of thread grooves on the blanks, mechanism for rotating each blank through a. predetermined number of revolutions, mechanism for efl'ecting a relative movement between" the blank support and the cutter in the direction of the axis of the blank, said movemc nt being of such rate as to produce the desired pitch of the thread, mechanism for effecting a relative movement between the blank support and the cutter in a direction transverse to the axis of the blank; a manually operable member, and mechanism operated by said memher for controlling said relative movement mechanisms and establishing a predetermined lnitial relat-ronbetween the blank support and the cutter after the rotation of the said relative movement mechanism and for separating the blank support and cutter.

14. A machine for thread ng taps and the like, said machine including in combmatlon,

' a blank support, means for simultaneously cutting a plurality of thread grooves on the blanks, mechanism for rotating each blank through a predetermined number of revolutions, mechanism for effecting a relative movement between the blank support and the cutter in the direction of the axis of the blank, said movement being of such rate as to produce the desired pitch of the thread, and mechanism for rendering inoperative said relative movement mechanism, separating the blank support and the cutter, and establishing a predetermined initial relation between the blank support and the cutter.

15. A- machine for threading taps and the like, said machine including in combination,

a blank support, means. for simultaneously cutting a plurality of thread grooves on the blanks,,mechanism for rotating each blank through a predetermined number of revolue tions, mechanism for efiecting a relative movement between the, blank support and thecutter the direction oftlie' axis of the blank, said movement of such rate as to produce the desired pitch of the thread, a

manually operablemember, and mechanism,

opera ed bysaid member for rendering in operative said relative movementfmecha- I nism, separatingtheblanksupport and the a blank support including a spindle pro:

vided with a chuck,- means for simultaneously cutting a plurality of thread grooves on the blanks, mechanismior rotating the blanks through a predetermined number of revolutions, mechanism for eiiecting a relative movement between the blank support and the cutter in the-direction of the axis of the blank, said movement'bei'ng of such rate as to produce the desired pitch of the thread, and mechanism for actuating said chuck, rendering inoperative said relative movement mechanism, separating the blank support and the cutter and establishing a predetermined initial relation between the blank support and the cutter.

17. A machine for threading taps and the like, said machine including in combination, a blank support including a spindle provided with a chuck, means for simultaneously cutting a plurality of thread grooves on the blanks, mechanism for rotating the blanks through a predetermined number of revolutions, mechanism for eiiecting a relative movement between the blank support and the cutter. in the direction of the axis of the blanks, said movement being of such rate as to produce the desired pitch of the thread, a manually operable member,

and mechanism operated by said member for actuating said chuck, rendering inoperative said relative movement mechanism, separating the blank support and the cutter, and establishing-a predetermined initial relation between the blank support and the cutter.

18. A machine for threading tape and the *like, said machine including in combination, a blank support, means for simultaneously cutting a plurality of thread grooves on the blanks, a member for eiiecting a relative movement between the blank support and the cutter in the direction of the axis ofthe blank, automatic mechanism for actuating said member to produce said relative'movement, a manually operable member for disconnecting said automatic mechanism and returning said relative movement member to its initial position. v

19. A machine for threading taps and the like, said 'machine including in combination, a blank support, means for simultaneously cutting a plurality of thread grooves on the blanks, a member for eflecting a relative movement between the blank support and the cutter in the direction of the axis of the v blank, automatic mechanism for actuating said member to produce'said relativemovement, a. manually operable member, and mechanism' actuated by said manually operable member for "separating the blanksupport and the cutter, disconnecting said automatic mechanism,- returning said relative movement member-to its initial position, and establishing a predetermined initial relation between, the blank support and the cutter.

20; A machine for threading taps and the like, said machine including in combination,

a blank support, means for simultaneously cutting a plurality of thread grooves on the blanks, a member for eflecting a relative movement between the blank support and the cutter in the direction of the axis of the blank, automatic mechanism for actuating said member through different distances to produce different relative movements benames tween the blank support and the cutter, and

a manually operable member for disconnect ing said automatic mechanism and returning said relative movement member to its initial position.

21. A machine for threading taps and the like, said machine including in combination, a blank support, means for simultaneously cutting a plurality of thread grooves on the blanks, a member for efiecting'a relative movement between theblank support and the cutter in the direction of the axis of the blank, automatic mechanism for actuating said member through different distances to produce dilferent relative movements between the blank support and the cutter, a manually operable member, and mechanism actuated by said manually operable member for separating the blank support and the cutter, disconnecting said automatic mechanism, returning said relative movement member to its initial position, and establishing a predetermined initial relation between the blank support and the cutter.

22. A. machine for threading taps and the like, said machine including in combination, a blank support, means for simultaneously cutting a plurality of thread grooves I on the blanks, a member for effecting a relative movementrbetween the blank support and the cutter in the direction of the axis of the blank, automatic mechanism for actuatingsaid member through a relatively great distance to produce a proportionately small relative movement between the blank support and the cutter, and-a manually operable member for disconnecting said automatic 1 mechanism and returning said relative move- Jan ment member to its initial position.

' 23. A machine for threading taps and the like, said machine including in combination, a blank support, means for simultaneously' cutting a plurality of thread grooves on the blanks, a member for efiect:

ing a relative movement between the blank 'support and the cutter in the direction of the aXis of the blank, automatic mechanism for actuating said member through a' relatively great distance to produce a proportionately small relative movement. between the blank support and the cutter, a manually operable membemand mechanism actuated by said manually operablemember for separating the blank support and the cutter, disconnecting the said automatic mechanism, returning said relative movement memberto its initial position, and establishing a predetermined initial relation between the blank support and the cutter.

24. A machine for threading taps and the like, said machine including in combination, a blank support, means for simultaneously cutting a, plurality of thread grooves on the blanks, a member for effecting a relative movement between the blank, support and the cutter in the direction of the axis of the blanln'automatic mechanism for actuating said member to produce said relative movement, a manually operable member for releasing said relative movement *member from said automatic mechanism, returning the released member to its initial position and securing it to said automatic mechanism.

25. A machine for threading taps and the like, said machine including in combination, a blank support, means for simultaneously cutting a plurality of thread grooves on the blanks, a member for effecting a relative movement between the blank support and the cutter in the direction of the axis of the blank, automatic mechanism for actutive movement member from said automatic I mechanism, returning the releasedmember to its initial position, resecuring it to said automatic mechanism, and establishing a predetermined initial relation between the blank support and the cutter.

26. In. a; machine for threading taps, re volving cutters and blank supporting and rotating means; means for causing the cutters to take a roughing cut during one rotation of the blank, means for causing relative displacement of the cutters and the blanks parallel to the axis of the blank in proper proportion for the pitch of the thread; and means automatically brought into action at a. determinate point in the ro-" tation of the blank for then advancing the cutters nearer the axis of the blank to take a finishing cut. a g I 27. In a machine for threading \taps, revolving cutters, blank supporting and rotating means; means for causing the cutters to take a roughing cut during a rotation of the blank, means for causing relative displacement of' the cutters and theblanks parallel to the axis of the blank in proper fecting a predetermined number of vihra tory movements between the blankand cutter' during each revolution of the blank, and means for effecting a relative advancing movement between the blank su'pport and ment between the blank and cutter, and

ter during each revolution of the blank,

means for efl'ecting a relative advancing movement between the blank support and the cutter, said advancing movement occurring substantially between successive revolutions of the blank.

30. A metal working machine including in combination, a blank support, mechanism for rotating the blank through a plurality of revolutions, a cutter, mechanism 'for effecting a predetermined number of vibratory movements between the blank and cutmeans for effecting a relative advancing movement between the blank support and the cutter, said advancing movement occurring substantially between successive revolutions of the blank, and means for separate ing the blank and cutter after a predetermined number of revolutions of the blank have ccurred.

31. A metalworking machine including in combination, a blank support, mechanism for rotating the blank through a p ality of revolutions, a cutter, mechanism f r eff fecting' a predetermined number ofvibra tory movements between the blank and cutter during each revolution of the blank, means for effecting a relativeadvancing movement between the blank support and the cutter, said advancing movement occur ring substantially between successive revolutions of'the blank, a manually operable member, and means operated by said memher for separating the blank and cutter after a predeterminedlnumber of revolutionsv of the blank have occurred.

' .tory movements betweenithe blank and v 32. A metal working machine including in combination, a blank support, mechanism for'rotating the blank through a plurality of revolutions,- a cutter, mechanism for effecting apredetermined number of -vibracutter during each revolution of the, blank, means for efiecting a relative advancing movement between the-blank support and the cutter, said advancing movement occurring substantially between successive revolutions of the blank, mechanism for operating the blank and cutter after a predetermined numberof revolutions of the blank blank support and the cutter, a manually operable member, and means operated by said member for actuating said separating mechanism and said initial (relation mecha- 33. A metal working machine including in combination, a blank support, a vcutter, mechanism for rotating the blank through a predetermined number of revolutions, and

mechanism for effecting a predetermined j relative approachmg movement between the blank support and the cutter, said a preaching movement occurring substantially between consecutive revolutions of the blank. 34. A metal working machine including in combination, a blank support, a cutter, mechanism for establishing a predetermined initial relation between the blank supportin combination, a blank. support, a .cutter,

mechanism for establishing a predetermined initial relation between the blank support and ,cutter, mechanism for rotating the blank through a predetermined number of revolutions, mechanism for effecting a predetermined. relative approaching movement between the blank support and the cutter, said approaching movement occurring substantially between consecutive revolutions of the blank, mechanismfor separating the blank and cutter after the rotation of: the blank has ceased, a manually operable member, and .means operated by said member for actuating said separating mechanism and said initial relation mechanism.

in combination, a spindle provided with a chuck, a cutter, mechanism for effecting a relative movement between the spindle and the cutter, a manually operable member, and means actuated by said manually operable member for operating'said chuck and for rendering operative saidrelative movement -mechanism. n

37. A' metal working-machine including in combination, a' spindle provided with a chuck, a cutter, mechariisnlior effecting a relative movement between the spindle and x the cutter to bring the spindle and cutter into cooperative relationship and to perform the cutting operation, amanually operable member, and means "actuated by said man- 36. A metal working machine including ually operable member for operating'said have occurred, mechanism for establishing a predetermined initial relation between the chuck and for rendering operative said rela- Y ating said separating mechanism.

combination, a spindle provided with a chuck, a cutter, a feed screw rotating in unison with said spindle, mechanism operated by said feed screw for effecting a relative movement between the spindle and the cutter, a manually operable member, and means actuated by said manually operable member for actuating said chuck and for connecting and disconnecting said feed screw and the mechanism operated thereby.

39. A metal working machine including in combination, a blank support, a cutter support, mechanism for effecting a relative feeding movement between said supports,

mechanism for establishing a predetermined a chuck, a cutter support, mechanism for effecting a relative feeding movement between said supports, mechanism for, separating said supports, a manually operable member, and means actuated by said manually operable member for rendering inoperative said feeding mechanism and for actuating said chucks and said separating mechanism.

42. A metal working machine including in combination, a blank support provided with a chuck, a cutter support, mechanism for effecting a relative feeding movement be-. tween said supports, mechanism for separating said supports, a manually operable member, and means actuated by said manually operable member for rendering inoperative said feeding mechanism, actuating said chuck and said separating mechanism,

and establishing a predetermined initial relation between said supports.

43. A metal working machine including in combination, a blank support. provided with a chuck, a cutter support, mechanism for effecting a relative feeding; movement between said supports, said blank support comprising 'a movable member mounted at the ,side of the blank opposite the cutter and arranged to engage the end of the blank, a

manually operable member, and means actuated by a single movement of said manually operablemember for positioning and clamping said movable member.

44. A metal working machine including in combination, a tail stock comprising a pivoted member, a stop shoulder and a cooperating projection, said cooperating parts having surfaces constructed to fix the position of said pivotedmember and clamp it, and a manually operable member for actuating said pivoted member.

45. A metal Working machine including in combination, a tail stock comprising a pivoted member, a stop shoulder and a cooperating projection, said cooperating parts having surfaces constructed to fix the position of said pivoted member and clamp it, and a toggle comprising a hand lever and a link for actuating said pivoted member.

46. A machine for threading taps and the like, comprising, in combination, means for supporting and rotating a blank, means for cutting grooves near one end of the blank, said blank supporting means comprising a movable member mountedat one side of the blank and arranged to engage the end of the blank, and means for positioning and' clamping said movable member.

47. A machine for threading taps and the likecomprising, in combination, means for supporting and rotating a blank, means for cutting thread grooves near one end of the blank; said blank supporting means comprising a movable member mounted-at the side of the blank opposite the cutter and arranged to engage the end of the blank, a

- manually operable member, and means actuated by a single movement of said manually operable member for positioning and clamping said movable member.

48. A machine for threading taps and the like, comprising, in combination, means for supporting and rotating a blank, means for simultaneously cutting a plurality of thread grooves near one end of the blank, said blank supporting means comprising a movable member mounted at one side of the blank opposite the cutter and arranged to engage the end of the blank, and means for positioning and clamping said movable member.

In testimony whereof, I have signed m name to this specification, in the presence of two subscribing witnesses/ I FRIEDERICH MULLER.

, Witnesses:

' LUTHER C. MORRISON,

WILLIAM J. DoLAN.