US277746A - Machine - Google Patents

Description

6 Sheets- Sheet l.

(No Model.)

W. KRUTZSGH.

MULTIPLE MILLING MACHINE.

Patented May 15, 1883.

@.1. yz gli (No Model.)

6 Sheets-Sheet 2. W. KRUTZSGH.

MULTIPLE MILLING MACHINE. No. 277,746.

Patented Mey 15, 1883. ,2.

l Attorliyq.

N. PETERS Phem-Limugmpnw, wnhmgfon, n. C.

(N0 Model.) 6 Sheets-' 'Sheet 3.

W. KRUTZSCH.

MULTIPLE MILLING MACHINE. No. 277,746. Patented May 15,1883.

(No Model.) 6 Sheets-Sheet 4.A

W. KRUTZSGH.

MULTIPLE MILLING MACHINE.4

No. 277,746. Patented May 15,1883.

N PETERS. Phomuehogmphur, washingmmuc I f Mg; Afforney `6 Sheets-Sheet 5. W. KRUTZSCH. MULTIPLE MILLING MAGHINE.

(No Model.)

6 al l l agmted May 15, 1883.

6 Sheets-Sheet 6.

(N0 Modal.)v

W. KRUTZSGH. MULTIPLE MILLING MACHINE.

No.V 277,746.

, Patented May 15,1888.

NITED STATES PATENT Orme.

VILLIAM KRUTZSOH, OF DAYTON, OHIO, ASSIGNOR TO THE BUQKEYE IRON AND BRASS WORKS, OF SAME PLAGE.

MULTIPLE MILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 277,746, dated May 15, 1883, Application tiled September 19, 1552. (No model.)

To all whom it may concern:

Be it known 'that l, WILLIAM KRUTZSCH, a citizen ot' the United States, residingat Dayton, Montgomery county, Ohio, have invented new and useful Improvements in Multiple Milling-lllachines, of which the following is a specification.

Myinvention relates toamachine. for milling polygonal or multiplesided obiects of diflo ferent shapes, sizes, and configurations; and the novelty consists in the combination .and arrangement of parts, as will be more fully hereinafter set forth, and specifically pointed out in the several clausesot' claims. i5 Among others, the esscntialobjects of the invention maybe briefly stated to be as tot lows: l'irst, to provide a machine having a series ol' carriages containing a series ot' revolving cutterspindles, said carriages being 2o adapted to have a reciprocating and lateral movement in corresponding ways or guides, each movement ot'eaeh carriage heilig sut'licient to allow its respective cutter to effectively mill that side o't' the work which is presented to the carriage; second, to provide means for adjusting the' spindles either sim ultaneously or independently of each other, as maybe desired; third, to provide means for causing certain rotary feeddevices to effect 3c straight lateral movement of the carriage; fourth, to provide means for automatically stopping the feed, and for reversing the same, so as lto canse the carriagcto be moved back and forth; fifth, to furnish improved means for holding` work of various sizes and shapes.

These objects are accomplished by the mechanism, the arrangement, construction, and combinations of mechanical features, as illustrated in the accompanying drawings, which 4o form apart ofthis specilicatiomandin which- Figure l is a sideelevation ot' my improved milling-machine, with the feed-motion and re verse-gears in section. Fig. 2 is a front elevation, partly in section, to illustrate the carria-ge and slides, adjusting-screw for various lengths ot' work, driving=pulley, `and gears. Fig. 3 is a top plan viewlofa portion of the machine, showing the devices for raisingand lowering the work tobe milled and present- `carriages, and Fig. 9X a detail.

ingitat the proper height l'or the cutters. 5o Fig. 4 is a detail view, showing a portion of the mechanism for raising and lowering the clamping device which holds` the: work to be milled. Fig. 5 is a top plan view of the machine. Fig. (i is a horizontal section taken on 55 different planes to show the cutting devices. Fig. 7 shows a longitudinal section through oneot' the carriages, and also illustrates means for propelling the carriage and' operating and adjusting the cutter-spindle. Fig'. 7y is a 6o cross-section ol a detail. Fig. 8 represents one ofthe carriages. Fig. 9 shows principally a transverse section taken through one ofthe Fig. l0 is a detached top plan view ot the leed-gears and frictionpulley actuating the feed. Fig. 11Y is a detail section ot' the alternate worm-gear, and Fig. 12 a side elevation ofthe same. Figs. 13 and 14 are details. Fig. 15 is adetail view. partly in section, of' devices for stopping the 7o feed mechanism and causing a reverse motion o" the same; and Fig. 16 is a detached view ot' an attachment to one ot' the carriages.

Referring' to the drawings, in which similar figures of reference indicate like parts in all the figures, 1 indicates the carriage for the cutter-spindles. As the vmachine illustrated in this application is designed tomill a hexagonal article, six ot' these carriages are shown; but it will be understood that, as the machine 8o is designed to mill all kinds ot' multiple-sized objects or articles, the number of carriages may be varied according to the number ot'. sides to be milled. These carriages are radially arranged in a circle, and supported by a horizontal plate, 2, which constitutes a portion oi" the frame of the machine, and is provided with a series of grooved ways or guides, 3, in which the Hanges or dovetails 410i' the carriages are received, so as to reciprocate or 9o slide therein. These ways or guides 3 are tangential to a circle described about the center where the article to be milled is held, said guides 3 being arranged relatively to each other at angles which depend upon thelnumber ot' carriages and ways employed. To admit of the straight lateral movement on the part of the carriages, each carriage has a slida '1 l @vegane -alongr the sides of the articles or objects upon which they are designed to operate, and there- ,by mill the said sides by one simultaneous movement onthe part ot' all the carriages. The plate 6, (see Fig. 7,) which is adapted to turn upon the i'ixed plate 2, is connected with an annular grooved plate, 9, by means of one or more bolts, 10, which are so arranged that the plates G and 9 can be disconnected when desired, in order that the plute or shelf 9 can be revolved independei'itly ot' plate G, the object ot' which will be hercin'al'ter explained.

Fig. 11 indicates the hollow revolvingcutter-spindle, which ismountcd on the carriage 1. The cutter 12 is arranged at the inner end ot the spindle 11 upon the screw-threaded end of a rod, 13, which passes through the axial boxe of the spindle, and the said cutter 12 is connected with the inner end of the spindle 11 by means ot' a pim-14, fitted eceentrically into the spindle 11 and the cutter 12. This inode ot' connecting the cutters 12 with their respective spindles 1l admits of the ready disconnection ofthecutters when desired, it being only necessary to grasp the rod13 at the outer end and turn it until the innerend is uuserewed from the cutter.

In order to cause a simultaneous rotation of the cutter-spindles 11, each spindle has keyed thereon a pulley, 15, arranged within a recess i'crmed in the carriage l. These pulleys are driven by vertical belts 16, passing around belt-pulleys 17, arranged at the base of the ma: chine. Each of the lower pulleys, 17, connects with one ot' a circular set ot' intermeshing gears. 1S, one of the said gears being fixed upon theshaft ot' the main drivingpulley 19, which is driven by suitable belt-ing.

As the sizes ot' the articles to be milled may vary, it is necessary to provide for a simul-' taneous longitudinal or axial adjustment of the cutter-spindles 11, so as to adjust the cutters to a common center or outwardly from the same, according to the size of the article to be milled. Moreover, as the cutters become unequally worn, or ifthey are of unequal sizes, an independent'adjustment thereof becomes necessary. The independent adjustmeutot' a cutter is eiectcd by means of a band-plate, 20, tted upon and feathered to a longitudinal grooved screw-threaded sleeve, 21, which is arranged to turn upon the outer .end ot' the cutter-spindle. This screw threaded sleeve tits upon the cutter-spindle between an annular` shoulder, 22, and a nut, 23, on the latter,

and has its inner end fitted to Work in the nut 24., which is screw-threaded both internally and externally, and is arranged within a recess in the carriage. A portion ofthe nut 24 is exposed through an opening in the carriage, as illustrated in Fig. S, and is engaged by an annular line of rack-teeth,25, (see Fig. 7,) with which the annular plate or shell 9 is provided at its lower outer edge. The shell or plate 9, which thus engages the nut 24 will, when not rotated, hold the latter stationary, and hence by turning the hand-plate 20, which, it will be remembered. is feathered upon the screwthreaded collar 21, the said collar will he rotated and caused to slide through the handplate 2() by reason of its engagement with the nut- 24, now held stationary. The collar 21, in its longitudinal movement, will be forced against the shoulder or the uut upon the cut ter-spindle,according to the directioninwhich `the hand plate 20 is turned, and hence the spindle can be moved in or out in aline coin cident with the axis. After the spindle 11 has been thus adjusted it can be secured against further longitudinal adjustment by rigidly securing the hand-plate 20 to a cap, 26, fitted upon the outer end of the carriage. Thehandplates can ne thus connected with the said caps by means of bolts 27, countersunk in the cap 26 and passing through slots in thehandplate 20, so as to receive on their outer ends nuts,\vhich, when tightened up,hold the hand' plates in rigid connection with the Vcaps atthe outer ends ot' the carriage. (See Fig. 7.)

lIn order to et't'ect a simultaneousadjustment ot the cutter-spindles, the annular shell or plate 9 must first be unlocked from its rigid connect-ion with plate 6 by loosening the nut upon the bolt 10, which will have its head couutersunk i'n said plate (i, and its upper screw-threaded end extended up through an opening in the annular shell 9. This shell 9 is then caused to turn by means which will be presently described, and while thus moving independently of the plate 6 the shell 9 will rotate the gear-nuts 24, with which its line oi' teeth engages, and the said rotating nuts, by reason ot' their engagement with the screwthreaded -colla-rs 21, held against rotation by the hand-plates 20, will cause the said collars to move longitudinally, and thus effect a sim ultaneouslongitudin al movement on the part of all the spindles 11. During such operation the feathers of the hand-plate 20, received in longitudinal grooves in the screw-threaded collar, while preventing the same from rotating, will allow'them to slide longitudinally. After the spindles have been thus adjusted the an nular shell 9 and plate G are again lockedv IOO IlO

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direction. `The lateral movement ot' the car riages can also be effected by turning the said hand-wheel 31, if such result be desired. The vertical shaft 32 of this hand-wheel extends down to the base of the machine, at which point it is properly stepped, as shown.

In order to produce the required reverse feedmotions, the shaft 32 has keyed upon its lower portion the right and left hand wormwheels 33 and`34. A rocking frame, 35, carrying a pair of rotary wornrshafts, 36 and 37, is supported on a rock-shaft, 38, arranged between the rotary shafts, and journaled in the casing of the machine or in other suitable bearings. These rotary worin-shafts 36 37 are respectively provided with right and left hand worms 33 34, so that the direction in which the shaft 32 is rotated will depend upon which one ofthe wornrwheels is engaged by its appropriate worm-shaft. The rocking frame 35 is actuated so as to bring either one of its wornrshafts into such engagement by means of an upper gear-segment, 43, which is provided with a handle, 42, and fixed upon a sleeve, 44, through which the shaft 32 passes.

This sleeve is provided at its lower end with a gearsegment, 45, arranged to engage and operate a sliding rack-bar, 46, which is pivotally connected with an arm, 47, ofthe rocking frame 35, that carries the worm-shafts. By operating the handle 42 the vertical sleeve can be turned in either direction, and hence the rocking frame vibrates through the medium of the lower gear-segment, 45, and sliding rackbar 46.

Motion is transmitted to the worin- shafts 36 and 37 through the medium of a suitably-an ranged train of gears, 48, one ot' which is mounted upon a shaft, 49, ofa friction-pulley, 5l), arranged to bear against the inner face ot' one ot' the driving-pulleys 17. In this way the wormshafts are driven by the said drivingpulley 17 and hence as a worm-shaft is brought into engagement with its appropriate wormwheel the shaft 32 will be rotated and the annularV shell 9 revolved until the carriages have been moved laterally to the required extent, and the feed stopped by operating the gear segment 43, so as to tilt back the rocking frame and throw the `shaft out of engagement with the worin-wheel. In case of accident or necessity both ofthe worm-shafts can be thrown out of connection with, the worm-Wheels, and the frame 35 maintained in .a vertical position by dropping the bar 51, which connects with the pivoted bearing 52 for the axle of frictionwheel 50. rlhe bar 51 extends up through 4the easing at the base ofthe machine, and can be raised or allowed to drop so as to bring the wheel 50 into frictional contact with the driving-pulley 17, or freed therefrom by means of a set-screw. 53, passing through an arm on the upper end of the bar 51 anti bearing' upon the casing.

In order to avoid all shock in reversing the feed, to give an equable pressure ot' the worn1- shafts against their respective wheels, and lo eifect an instantaneous disengagement of said worm-shafts from the worin-wheels, I provide two spindles, 54, which pass through a support, 55, having recesses in which coiled springs are located and connected with the 'spindle 54, so as to throw the same forward, and thereby canse'them to act on the rocking frame 35. These springs are important elements in attaining these results. Vhen the worm -shafts are both disengaged from the worm- wheels 33 and 34 thefeed will be stopped; `and when one of the worm-wheels is next engaged by its respective worm-shaft the feed will recommence, the direction of its motion depending on which worm-wheel is engaged. The feed is automatically stopped, and at the appropriate time is reversed by means of devices best illustrated in Figs. 16 and 17, in which 57 indicates a sliding rack-bar engaged bythe gear-segment 43.

58 indicates two slide-bars, made semicircnlarin crosssection, and arranged with their iat sides together. These bars are respectively provided at4 their inner ends with right and left hand screw-threads, and are arranged to operate through a right and left threaded sleeve or nut, 59, which is supported from one of the carriages by means ot' a collar, Gli), pass ing around said nut, and provided with a pin entering a peripheral groove, 61, in the'latter. By turning the sleeve or nut 59 the bars 53 will be simultaneously extended fromi or retracted within the nut, so as to increase ordecrease the distance between their outer strilc ing ends.

rlhe rack-bar 57 carries a pair ot' pivoted triggers, 62, which, when brought into contact with the catches G3 on guide-bar 64, are thrown into engagement with the same by means ot' springs 65, located in recesses in therack-bar a'nd adapted to bear against the triggers. As the nut or sleeve 64 moves with the carriage, one of its striking-rods 5S will impinge against one ot' the triggers at a moment predetermined by the extent to which the rods have been extended from the nut. This action on the part ofthe rod 5S will release the trigger (i2 from its catch 63, and hence release and allow the rack to slide, thereby permitting the gear-segment 43 to turn, which said segment will be automatically actuated by one of the springs 54, which, having been contracted, will now be allowed to expand, and thus bring the rocking frame 35 to a vertical position, and thereby move the lower raclrbar, 46, which, through the lower segment, 45, causes a partial rotation of the sleeve 44, upon which the upper gearsegment, 43, is secured. As the rocking frame 35 is ICO thus operated its worm-shaft (previously engaged with one of the worm-wheels) will be disengaged therefrom, and hence the feed will be automatically checked and all the carriages simultaneously stopped. It will be seen that the distances traversed by the carriages can be thus regulated by projecting the rods 5S to a greater or less extent from the sleeve or nut 59.

In order to start the carriages on their return movement, it will only be necessary to properly. move the handle 42 of the upper gear-segment, whereby the rack 57 will be caused to slide back, during which movement one of the triggers-as, for example, that shown at the right hand in Fig. 16--will engage with its appropriate catch. The sleeve 44,(luring this movement ot' the handle 42 and gear-segment 43, is necessarily rotated, so that the gear-segment at its lower end, 45, will move the lower rack-bar, 46, and consequently vibrate the rocker-frame 35, so as to cause one ofthesprings 54 to be compressed and the next one of its worin-shafts to engage its appropriate worm-wheel on shaft 32. The feed will then be started, and when the travel of the carriages is completed the trigger thus engaged will be struck by one of the bars 5S and. released, thus allowing the rack-bar57 to slide and permit the gear-segment 43 on the sleeve 44 to he turned, so as to stop the feed, as before. l

The means for adjusting the clamps or centers which hold the object to be milled so as to adapt them to articles of various sizes arc as follows:

69 indicates a vertical screw,arranged to move longitudinally within a suitable fixed sleeve, 68, secured by braces to the inner walls of a vertical hollow standard, 67. This screw, which extends upward without threads and has the upper end adapted to support the article to be milled, is raised or lowered by means of a worm, 70, upon the worm-shaft 71,

- having at one end a pinion, 72, engaged by a gear, 73, upon the shaft of a hand wheel, 70. This screw 69 is operated by a nut, 69X, which has an internal thread to engage the threads of the screw-rod 69, and' an externalqnick screw to engage the worm on the shaft 71. A feather .on the screw 69 and a slot in the sleeve 68 prevent the screw from turning, and the nut is held against vertical movement by any proper means. rlhe upper head, 75, for holding down the work, is secured upon the lower end of a yvertical rod, 74, which passes up through a hollow screw, 76, and has at its Lipper end, which extends into a hollow head, 77, of said screw, an oblong eye or slot, 78, as shown in Fig. 4. A handle, 79, pivoted to the hollow head of said screw, is provided `with a pin, 80, eccentrically connected to its pivot, and received into the slot at the upper end of rod 74. rlhe hollow screw 76 works through an internally-screwthreaded sleeve, 84, which is provided with a hand-wheel, S1, and arranged to turn in a frame, S2, supported before the machine by standards 83. After the handle 79 has been turned so as to depress rod 74 and bring the pin 8() on the dead-center, the hand-wheel 81 can be turned so as to rotate its sleeve S4, whereby the screw and rod will be lowered, and hence the head brought down and clamped upon the -work.

85 indicates an annular curved plate or flange for protecting the train of beveled gears at the base ofthe machine, and S6 indicates a rod which will be provided at its lower end with mechanism suitable for shifting the main driving-belt from pulley 19 to a loose pulley, which can be mounted on the' same shaft as in `ordinary belt-shifting devices.

Modiiications in details of construction may be made without departing from the principle or sacrificing the advantages of my invention, the essential features of which have been described, and are fully illustrated in the drawings. l

I am aware that a machine for dressing and pointing bolts and nuts has heretofore been provided with a series of radial spindles adjustable toward and from a central point, and having the cutting-tools on their inner adjacent ends, and such, therefore, 1 do not broadly claim.

Having thus described my invention, what I claim is- 1. In a machine for milling multiple-sided objects, the combination, with an annular series of laterally-movable carriages, of rotary and longitudinally -movable cutter spindles mounted in said carriages, and mechanism,

substantially as described, for effecting an independent longitudinal adjustment of the cutter-spindles, as and for the purpose specied.

2. In amachine for milling multiple-sidedobjects, the combination ofa horizontal plate provided with ways set at suitable angles to each other, carriages adapted to slide simultaneousl y in said way-s, rotary cutter-spindles supported insaid carriages, and each provided with a proper cutter readily removable and interchangeable at will, and mechanism, substantially as described, for adjusting and operating the carriages and cutter spindles, whereby all sides ot' the object may be cut or milled at a single operation, substantially as set forth.

3.- In a machinefor millingmultiple-sided objects, thecombination ot' the annular series of laterally-movin g carriages with the rotary and longitudinally-movable cutter-spindles mounted in said carriages, and with mechanism, substantially as described, for effecting a simultaneous longitudinal adjustment of all of the cutter-spindles, for the purposes set forth.

4. In a multiple-sided milling-machine, the combination,with a series of cutter-spindles mounted in carriages adapted toslide in suitable ways, said carriages being provided with suitable gear-nuts, of a plate` provided with a rack, a vertical shaft having agearv arranged to engage therewith, and a friction-pulley,

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revolvable plate by means of a slide adapted to partake of the revolving movement of the plate, so as to thereby cause the lateral movementof the carriage, and being further adapted to slide in aline coincident with the axis of the cutter-spindle, whereby as the said plate is revolved the carriage will be allowed to move freely in its straight way, substantially as described.

6. In a multiple-sided milling-machine, thecombination ofthe xed plate 2, having suitable guideways, 3, the carriages l, having slides 5, the shell-plate 9, having rack l0, and the operating mechanism, substantially as described.

7. The combination, in a milling-machine, of a set of laterally-movable carriages carrying rotary cutter-spindles with a horizontal fixed plate having a series ofstraight ways for the said carriages, a rotary plate connected with a revolvable shell and with the carriages by means of a slide and set-screws 7, passing through slots in the said fixed plate, substantially as described.

`8. The combination, in a milling-machine, ot' a series of carriages, each carrying a rotary cutter-spindle, with a handplate feathered upon an externally-screw-threaded sleeve loosely arranged upon the cutter-spindle, a screwthreaded nut litted upon and meshing with the said screw-threaded sleeve, means for holding the nut stationary when the sleeve is rotated by turning the hand-plate, and devices for securing the hand-plate to the carriage afterit has been turned and the spindle adjusted, whereby the spindles oi" each carriage can be adjusted independently or" the others, substantially as described.

9. The combination, in a millingmachine, ot'

1 a series of carriages, each carrying a rotary cutter-spindle, with screw-threaded sleeves looselyiitted upon the cutter-spindles, means, substantially as described, for securing the sleeves against rotation, the externally and internally screw-threaded nuts iitted upon the said sleeves, and the revolvable shell provided with a line of gear-teeth engaging the screw` threaded nuts, whereby by a revolving movement on the part of the said plate a simultaneous longitudinal adjustment on thev part of the cutter-spindles can be effected, substantially as described.

l0. The combination, ina milling-machine, ol' the laterally-movable carriages, carrying the rotary and longitudinally adjustable cutterspindles, with the slides having a sliding connection with the carriages, the screws connectin g said slides with a revolvable plate, the screw-threaded sleeves loosely arranged upon the cutter-spindles, the hand-plates feathered upon the sleeves and detachably connected with the carriages, the screw-threaded nuts fitted upon the screw-threaded sleeve, and the annular rotary shell 9, provided with gearteeth engaging said nut and detachably connected with the plate 6, whereby either the independent or simultaneous longitudinal adjustment of the spindle can be effected at will, substantially as described.

l1. In a multiple-sided milling-machine, the combination, with a hollow spindle and a cuttercarried thereby, of eccentric pins connectingthe parts, and a screw-bolt passingthrough the hollow spindle and engaged with the cutter, whereby it may be disengaged from the outside of the machine, substantially as described.

12. The combination, ina milling-machine, of the annular series of laterally-movable carriages l, each carrying a rotary cutter-spindle, with the pulleys feathered upon the cutterspindles, the lower driving-pulley, 19, connected with the spindle-pulleys by endless belts, and the circular train oi' bevel-gears in rigid connection with the lower belt-pulleys, substantially as described.

I3. In a milling-machine, the combination, with the hollow cutter-spindle supported in a carriage, of the rod passing through the bore of the spindle and screwed at one end into the cutter, and a pin iitted eceentrically into the cutter and the spindle, whereby by unscrewing the rod from the cutter the said cutter can be removed 'at will, substantially described.

14. The combination, in a milling-machine, with the series of laterally-movable carriages, each provided with a rotary and longitudinallyadjustable spindle, of the rotary shell and means, substantially as described, for effecting the movement of the carriage, and the hand- Wheel having upon the vertical shaft a pinion engaging a ring-gear upon the rotary shell, whereby, when desired, said parts may be actuated by hand, substantially as described.

15. The combination, in a milling-machine, ot' a series oi' laterally-movable carriages carrying the cutter-spindles with the feed mechanism, consisting of a right and left hand worm-wheel, both mounted npona shaft, from which, through the medium ot' connections, substantially as described, thc said carriages are caused to move in their ways, and a rocking frame carrying a right and lef't hand rotation wornrshatt, said worm-sh afts bein g adapted to be brought into alternate engagement with the said worm-wheels or both thrown out of connection from the same, whereby thefecd can be stopped or reversed,as and l'or the purpose specified.

16. In a multiple-sided milling-machine, the combination, with the spindle-supportingcar- IOO IIC

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riages l and the plate 9, having rack 29, of

the feed-shaft 32, segmental gear 43, rack 57, sleeve44, rack 46, Worm- wheels 33 and 34, and rocker-frame 35, having worm-gears 40 41, substantially as described.

17. In a milling-machine, the combination, with a series of carriages provided with revolvingcutter-spindles, of means, substantially as described, for holding the work in a fixed position, and mechanism, substantially as described, for causing the cutters to traverse its faces, thereby removing the surplus metal and polishing' all of its sides or faces at one operation, substantially as described.

18. In a milling-machine, the combination, with a hollow spindle provided with a cutter, of a screw-bolt arranged to be operated from the outside of the machine and screwed into or unscrewed out of connection with said cutter, whereby the latter is lheld against an eccentric pin or key, substantially as described.

19. In a milling-machine, the combination, with the series of carriages carrying the cutter.- spindles, of the rotary shaft carrying the right and left hand worm-Wheels, the rocking frame carryingtherightand left hand rotating wormshafts, a sliding rack-bar connecting with the rocking frame and engaged by-a gear upon sleeve 44, and means, substantially as described, for turning the said sleeve so as to ro- ,tate the rocker-frame, as and for the purpose specified.

20. The combination, in a milling-machine, of the sliding carriages carrying the cutterspindles, of the rotary shell 9, with connections, substantially as described, for operating the carriages, means, substantially as described, for revolving the shell, and devices, substantially as set forth, for automatically stopping the feed t after the carriages have traveled the required distance, substantially as set forth, for the purposes specified.

2l. The combination, in a milling-machine, of the laterally-movable carriages carrying cutter-spindles, a rotary shell, 9, for effecting the movement of -the carriages through connections, substantially as described, means for revolving the said shell, devices for automatif cally stopping the feed, and means, substantially as set forth, for effecting the reversal of the feed-motion and a reverse rotation of said shell 9, so as to cause the carriages to` make the return movement, as and for the purpose specified. v

22. The combination, in a milling-machine, of the carriages and rotary cutter-spindles with the rotary shaft provided with right and left hand worm- wheels 33 and 34, connections between said rotary shaft and the sliding carriages, the rocker-frame 35, provided with right and left han d worm-shafts, and springs adapted to maintain the rocking frame in such position 23. Thecombination, ina milling-machine, of the sliding carriages carrying the rotary cutter-spindles with the rotary shaft 32, provided with right and left hand worm-wheels 33 34, connections between said rotary shaft 32 andthe sliding carriages, the rocking frame 35, carrying the right and left hand worm-shafts, the springs connected with the spindles, and means, substantially as described, for actuating the rocher-frame, as and for the purpose specified.

24. In a milling-machine, the combination, with a series of carriages provided with rotary cutter-spindles, of means, substantially as described, for effecting a simultaneous longitudinal adjustment of all the spindles to correspond with varying sizes of work, said adjusting devices consisting, essentially, in a hand-plate rendered stationary and feathered to a screwsleeve, on which operates a gear-nut attached to said carriage, said gear being actuated by acommon rack, substantially as specified.

25. The combination, in a milling-machine provided with sliding carriages carrying rotary longitudinally-adjustable cutter-spindles, of the right and left-hand worin-wheels 33 an d 34 with the rocking frame 35, carrying right and left hand worm-shafts, the rotary sleeve 44, provided with a lower gear which engages a sliding rack-bar connected with the rockershaft, and the upper gear-segment, 43, fixed upon said sleeve and provided with a suitable handle, substantially as described.

2G. In a milling-machine, the combination, with a feed mechanism for the carriages carrying the cutter-spindles, of devices, substantially as described, for causing the automatic stoppage of the feed, the same consisting in a sliding rack-bar, 57, provided with pivoted triggers 62, and the striking-rods 58, supported from one ofthe carriages, and adapted to alternately strike the triggers when the carriage has traveled the required distance, andA thus release the triggers from their catches substantially as described.

27. The combination, in a milling-machine, ofthe nut 59, having a right and left handed thread, with the right and left screw-threaded bars 58, the carriage from which the nut is supported, the sliding rack-bar 57, and the trigger 62, substantially as described.

28. The combination, in a milling-machine, of the laterally-movable carriages carrying the rotary cutter-spindles, with the right and left hand worm-wheels upon a rotary spindle or shaft, 32, connections between said shaft and the sliding carriages, the right and left wormshafts adapted to be brought into alternate engagement with the worm- wheels 33 and 34, a spring or springs, 37, for facilitating the disengagement of the Worm-shafts from the wormwheels, the sleeve 1l, with means, substantially as described, for connecting it with the rocking frame carrying the worm-shafts, the gearsegment 43, rack-bar 57, engaged by said gear ICO ITO

and carrying the triggers 62, and the strikinglrods 58, supported from one of the carriages, substantially as described.

29. The combination, in a. milling-machine, of the feed mechanism for the sliding carriage carrying the rotary cutter-spindles, substantially as described, with the friction-Wheel 50, for actuating the feed mechanism, substantially as set forth.

30. In a. mil1ing-machine,tl1e means for holding down the Work, consisting of a vertical rod, 74, passing through a hollow screw, the handle 79, provided with an eccentric pin entering a slot in the head of' said nut, and the hand-wheel fixed upon a rotary sleeve, which 15 is tted upon the screw and adapted to turn on a. frame located above the machine, sub. stantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing zo witnesses.

W. KRUfrzsoH.

Witnesses:

JAMES L. NoRRIs, JAMES A. RUTHERFORD.

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