US970330A

US970330A - Metal-working machine.

Info

Publication number: US970330A
Application number: US54355510A
Authority: US
Inventors: Henry Hess
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-02-12
Filing date: 1910-02-12
Publication date: 1910-09-13
Anticipated expiration: 1927-09-13

Description

H. HESS.

METAL WORKINGMACHINE.

APPLICATION rum) JULY 1B, 1003. RENEWED FEB. 12, 1910.

9 SHEETS-SHEET l.

Patented Sept. 13, 1910.

2. mm 8 mm.

1 95-15? new 0% 71 71? H. HESS.

METAL WORKING MACHINE. APPLICATION FILED JULYIB, 1903. RENEWED PM. 12, 1910.

Patented Sept. 13,1910.

9 SHEETS-SHEET 2.

N UHM wwneww anw H. HESS. METAL WORKING MACHINE. APPLICATION FILED JULY 18, 1903. RENEWED FEB. 12, 1910.

970,330, Patented Sept. 13,1910.

QSHELITW-BEEET 3. I

H. HESS.

METAL WORKING MACHINE.

APPLIOATIONYFILED JULY 18, 1903. RENEWED IEBJB. 1910. 970,330, Patented Sept. 13, 1910.

9 SHEETS-SHEET 4.

H. HESS.

METAL WORKING MAGHINE. APPLICATION FILED JULY 1a, 1903. nnnnwnn rm. 12, 1910.

970,330. Patented Sept. 13, 1910.

H. HESS.

METAL WORKING MACHINE. APPLICATION FILED JULY18,1903. RENEWED T11R12, 1910.

PIG'nli.

Patented Sept. 13,1910.

9 SHEETS-SHEET 8-- Q N H H. HESS.

METAL WORKING MACHINE. APPLICATION FILED JULY 18, 1903. RENEWED FEB. 12, 1910.

Patented Sept, 13,1910.

9 SHEETS-SHEET 7.

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trauma;

H. HES S. METAL WORKING MACHINE.

APPLICATION FILED JULY 18, 1903'. RENEWED PEB.12,\1910.

Patented Seapt. 13, 1910.

9 SHEETS-SHEET B.

[zvmzzv TOR H. HESS.

'METAL WORKING MAOHIN E. APPLIOATION FILED JULY 18, 1903. RENEWED FEB. 12, 1910. 970,330, Patented Sept. 13,1910

9BHEETS-SHEET 9.

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independent power drives for the cutter and the table feed, and interpose'change speed the speed of the cutter is t ecreased below a metal to be cut, the dimensions of the work,

UNITED STATEg OFFICE.

HENRY HESS, OF PHILAD ELPHIA, PENNSYLVANIA.

METAL-WORKING MACHINE.

Application filed July 18, 1903, Serial No. 166,201.

To all whom it may concern:

Be-it known that I, HENRY Hess, of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements in Metal-Working ing machines. 1 An object of the invention is to provid a milling" machine adapted to, make deep and wide cuts and which may therefore be used in place of slower tools such as plane rs and shapers. It is important in milling machines to be able to regulate the cutting speed to meet different conditions These conditions vary with the character of the depth of cut, etc. The cutting speed depends upon the surface speed of, the cutter in relation to the table feed movement, and the surface speed of the cutter depends upon its angular velocity and diameter. The angular velocity of the cutter remaining constant, any change in itsdiameter varies the cutting speed, and it is necessary to provide means for correcting these variations as well as adjusting the machine to difl'erent conditions of work. For this purpose I provide gearing of a conveniently operated type in the table drive. By adjusting the change speed gearing the rate of table movement may be varied easily to correspond with the surface speed of the cutter in use. Change speed devices may be also provided, if desired, in the cutter drive. When independent drives for the cutter and table feed are employed it becomes necessary to provide means for stopping the table drive to prevent injury to the cutter or other parts in case the cutter drive is interrupted. This interruption might occur for example, if the cutter is driven by a belt, by breakage of the belt. If the table continued to move contact of the work with the cutter teeth would break themor injure other parts of the machine. -I provide automatic means 'controlled by the cutter drive. iid acting when certain point or the drive is interrupted to discontinue the table drive. This mechan- Specification of Letters Patent.

Patented Sept. 13, 1910. Renewed February 12, 1910. Serial No. 543,555.

ism may be arranged to not substantially instantaneously. 1

, Broadly considered, my invention'is not confined to a machine tool like a milling machine in which there is a rotating cutter and a table feed, The cutter is not necessarily a rotating tool and the cutting and feeding movement need not be imparted to different elements; for instance, the tool may have two movements, one of which is a cutting and the other a feeding moveinent,'65 each of the two separate power drives above mentioned being arranged to effect one of the movements stated. In its broader aspect similarly the automatic throw-off mechanism is controlled by the cutting movement .spirit of the invention.

Figure 1 represents a side elevation of a milling machine to which I have applied my improvements. Fig. 2 is a plan view of the same. Fig. 3 represents an elevation of the front end of the machine. Fig. 4 is a plan of the cross-rail, and some of the connected parts, with the housing or standard partially broken away andshown in section. Fig. 5 is a side elevation ofthe cross-rail showing in section a cutter and means for mounting same. Fig. 6 is an elevation and nrtial section of the gear and worm for driving the cutter s indle. Fig. 7 represents a central sectiona view of the same. Fig. 8 represents an end elevation of the cros's rail, one of the cutter heads, and a cross-section of the cutter spindle. Fig. 9 is a cross-section of the cross-rail and end elevation of one of the cutter heads. Fig. 10

is a sectional view through a portion of the housing showing some of the feedandchange-speed gears. Fig. 11 is a detail view with parts brokenawu of a portion of the change-speed table-fee gearing. Fig. 12 is a transverse section of the housing, bed, table, feed-gear and clutch mechanism. Fig. 13 is a sectional view of the housing and a portion of thefeed-screw gear. Fig. l l ls a detail section showing the feed-Screw, 'ftts bearings and attached-parts. Fig. 15 is a.

longitudinal section of one end of the bed showing the table thereon. Fig. 16 is a plan of one end of the bed and table. Fig. 17 is an end view of the same. Fig. 18 is a crosssection'through the housing and bed showing a portion of the cutter drive gearing in section, and also showing the shouldering of the housing on the bed-cheek. Fig. 19 is a longitudinal sectional View, with parts broken away and in elevation, of the cone drive for the spindle and means for driving the feed-train independently of the spindle. Fig lQ is a detail view of the automatic throw-off mechanism associated with shaft 9, showing said shaft in section and looking toward cone pulley 8. Fig. 20 is a plan of Fig. 19 showing the housing in section. Fig. 21 is a detail longitudinal sectional view of the change-gear clutch mechanism.

Fig. 22 is a detail sectional view of part of the mechanism employed in reversing the clutch mechanisms of the change gears. Fig. 23 is a detail view of a portion of the mechanism for throwing out the feed-drive. Fig. 24 is another view of the mechanism of Fig. 23. Fig. 25 is a detail elevation and section of the feed-selecting operating wheel, and some of its attachments. Fig. 26 is a detail view of lever 113 and nose 114. Fig. 27 is a plan view in section showing all parts of the automatic throw-off mechanism in proper relation, also portions of the-spindle drive mechanism and the table drive gearing in assembled relation. Fig. 28 is an end sectional elevation taken through the housing of the spiral gear 87, and showing clearly the throw-off clutch, hand lever, table-trip, and operatingmechanism. Fig. 29 is a side elevation of the mechanism of Fig. 28. Fig. 30 is a detail, showing especially a portion of the automatic trip mechanism. v

In the drawings the bed 1 carries the table 2 adapted to reciprocate thereon. At the sides of the bed are standards 3 which carry the milling spindle.

The milling cutter 4 iscarried by

heads

5 and 6 secured to a cross-rail 7 capable of vertical adjustment upon the standards 3. The milling cutter 4 is driven by a cone 8 on a shaft 9 having a spiral pinion 10 inclosed in a housing 11 which meshes with a spiral gear'12 fast on a vertical shaft 13 and inclosed 'in'a housing 12. The upper end of shaft 13 is provided with a worm 14 inclosed in a housing 15 which meshes with a worm-gear 16, in a housing 17, fast on the spindle 18. Spindle 18 is carried in the

heads

5 and 6 on the cross-rail 7 and carries I the cutter or milling tool 4.

The cross rail 7 and the parts carried by it constitute in effect a holder for the millmg cutter or tool 4; and in certain of the claims herein when reference is made to a tool holder it is intended to designate the rail 7 and parts carried thereby with the exception of the cutter 4; and similarly when the tool is referred to it is intended to designate the milling cutter 4. The vertical adjustmentof cross-rail 7 is bad by means of the nuts 19 bolted to the cross rail, through which pass vertical screws 20 journaled in housing 3, and carry at their upper ends bevel gears 21 meshing with bevel pinions 22 mounted on shaft 23. The hand adjustment of the cross-rail is effected through hand wheel 24 fast on shaft 23, which rotates the screws 20 in either direction through the gearing just described. The power adjustment of the cross-rail is shaft carrying the reversing bevel gear 26 which meshes with a pair of gears 27 normally loose on the shaft 23. Slidably mounted on shaft 23 is a clutch spool 28 adapted to be shifted into engagement with either one of the loose gears 27 for the purpose of engaging either gear and causing that gear to rotate with the shaft 23. The clutch spool 28 is shifted by means of a sliding arm 29 carried on a rod 30 slidably mounted in the standards 31 on the .top rail 32 of the housing 3. clutch spool 28 normally disengaged from the gears 27. Ropes 34 are secured to each end of the rod 30 and pass over pulleys 35 and terminate at the side of the housing in handles 36 by means of which the spool provided for by the pulley 25 fast on a' Springs 33 hold the clutch 28 may be shifted either way against I the springs 33 and cause the rotation of the screws 20 in either direction, for the purpose of raising or lowering the cross-rail 7 The adjustments of the heads 5 6- on the rail 7 are secured by the

screws

37 and 38 and provide for the insertion. of different sizes of cutters 4.

In raising the cross-rail 7 through either the hand or power d rive, the vertical shaft 13 is raised or lowered with the spindle by reason of the engagement of the worm 14' with the wornrgear 16, the worfn being fast on shaft 13. Shaft 13 slidesu and down in. the shaft-box 39 disposedbe ow the ma-. chine-bed, spiral gear 12. being splined to shaft 13 to permit of such adjustment. The thrust of shaft 13 is taken up by bearings 40 which are preferably ball-bearings, the bearings and shafts being provided with the adjustments shown in Fig. 6.

H .1. end of 'the cutter being journaled n head 6 in bearings 44.

The

heads

5 and 6 are preferabl sc cured to the cross-rail 7 by" means 0. gibs 41 adjustably set for wear, the inner contacting faces of the heads and rail being inclined, as-shown in Figs. 8 and 9. The

lower connecting points are preferably bolt and slot connections 42 which permit the adjustment of the heads upon the'rail. Spindle 18 terminates 1n the flange-43 to which the cutter 47is clamped, the other .Fig. 5 shows in section a cutter connected with the spindle. The cutter is centered gear 16 upon the cutter spindle 18 is secured by a plug 45 which may be an integral I part of spindle 18 or separate therefrom.

a The endwise adjustment of the wormby means of a halved ors lit collar 46, which is drawn together over t e hub of the gear by means of bolts 47 and firmly rips the hubof the gear on the spindle. n order to secure the necessary 'resiliency to the hub at the point where the clamping is effected, it is split longitudinally at 48 and transversely at 49. The s indle is splined at 50 in which a ke 51 ta (es which permits the adjustment 0 the spindle in jthe wormgear 16.

In millin machines subjected to great strain the a ove described method, or its equivalent, of securing the worm-gear to the spindle, is necessary.

The spindle 18 is secured in the head 5 on the cross-rail by means of a fixed collar 52 on one side thereof, and an adjusting up wear.

giving different s eeds.

An important eature of my invention is the provision of change speed gearing intermediate the-table and its source of power by means of which the rate of feed in relation to the surface s eed of the cutter may be readily adjusted i This change speed gearing will now be described. I

Upon feed shaft is located feed gearncst 61, in this instance comprising six diff fere'nt rates of speed. The complemental gear nests 62 are mounted upon a shaft 63 which transmits the motion to the feed nut which will presently be described. The mountings of the two sets of feed gear-nests are preferably in the housing 3, it being shown broken away in Figs. 10 and 11 for the purpose of illustrating the same. The

loose gears 62 are each {provided with a clutch mechanism and ,a eed selecting device by means of which any one gear of the nest may be'locked to the shaft 63 for the pur ose of putting in operation the desired feet. This selective feed clutch mechanism y will now be described:

'The shaft 63 is tubular and through'it passes'a rod 64 adapted to reciprocate within the shaft. Shaft 63 is provided with slots 65 at intervals adjacent to the hubs of the gears 62. Upon the outer end of the sliding rod 64 is afeather 66 which is secured to the end of the rod 64 by a spring'67 so as to be free to enter any] one of the slots 65 or recede therefrom as t cated within the shaft 63.

The hub of each loose gear 62 of thenest is provided with a coil spring 68 secured to the hub at an intermediate point of its length by pin 69 and having coils at either side of the point of fastening 69 adapted to form a portion of'the clutch mechanism in either direction of motion of the cars 62. To secure this result the outer en 5 of the springs 68 are formed with an eccentric cut 70 which terminates at one end in an abut- 66. As rod 64 slides along within the'shaft' 63 the feather 66 will enter any one of the slots 65 when it comes op' osite the same and the outer end of the feat er will, during the same period of revolution of the shaft, enter the eccentric cut or opening 70,and traverse the same until it comes squarely up against the abutment 71. The feather will then take the spring with it and graduall coil it up upon the shaft 63 until'the coil akes a firm e rod 64 is reciproment 71 adapted to be engaged by the feather I grip upon the shaft and the shaft and ear revolve together. If is desired to rive the gear in the opposite direction, the rod 64 is moved along the shaft, the inclined edges of the feather causingit tobe drawn outof the slot 65 when it Wlll enter the slot at the opposite-end of the coil 68 so that the gear may be moved in the reverse direction as before described. The feather preferably;

works in a slot in the end of rod 64 whic slot serves to steady the movement of the feather 66. a

The feed of the particular gear is selected by means of a hand .device com rising a hand-wheel 72 mounted at the si e' of the bed and carrying a gear 73, both on a shaft 74. The gear 73 meshes with the rack 75 on the rod 64, the rod being projected beyond the worm which drives the feed nut train of gears.

Mounted on shaft 74 are

disks

76 and 77 shown in detail in Fig. 22, each of which is provided with a series of notches 78 indicating the particula gears of the gear train nests 61 and 62 w ich are desired to be driven. These notches on

disks

76 and 77,

corresponding to the desired gear, are

brought into proper position and held by a spring dog 79. This dog is mounted on a stem 80 in a box 81 mounted on the bed or housing and is pressed toward the notches with worm gear 87 in housing 88 alongside or under the table 2. Worm 86 is preferably provided with ball bearings to take up the end thrust, and the housing 89 of the worm, supports the housing 88 of the worm gear 87. The'worm gear 87 is loose on a shaft 90 journaledin the bed transversely of the machine. This shaft 90 carries a worm 91 fast on the shaft which meshes with worm gear 92 which is the main feed nut of the machine. Worm gear 87 is pro vided with a clutch device by means of which it is normally made fast with shaft 90 so as to rotate therewith. For this .purpose the hub of worm 87 is provided with teeth within which a sliding splined clutch 93 engages. The clutch is operated by a lever94= ivoted at 95 and trunnioned at 96 to thee utch 93 and having an operating handle 97. Lever 94 holds the clutch in en gagement by a dog 98, and a spring '99 throws the clutch 93 out of engagement with the gear 87 whenever the dog is released. In its normal position the gear 87 is clutched to-the shaft 90.

The dog 98 is mounted on a projecting bearing 100 having a jack-in-the-box 101. The dog is provided with a horizontal rojecting arm 102 which engages normal y a nose 103 on the lever 94, having aninclined face, and holds the clutch in engagement. An adjustable trip 10 1 on the table isadapted, to operate the dog 98 and throw out the feed within any desired limits of table traverse in either direction. This is accomplished by providing the dog 98 with an upwardly projecting arm 105. As the trip 10% passes the arm. 105, it depresses the jack-in-the-box 101 and the arm 102, thereby withdrawing the latter from contact with the inclined nose 103 on the lever 94., and

ermittin the s rin 99 to throw the clutch p g p g "tion from the horizontal, which imparts to 93 out of engagement with the gear 87.

The feed train is driven independently of the spindle drive. With this arrangement breakage would result were the spindle drive tofbe interrupted. To'provlde'against such a contingency the. following device is rovidedwh'ch' will hrowfout the feed w one er ane r? 011 the front face of the driving cone 8 is pivoted at an angle one or more weights 106 provided with arms 109 pivoted angularly to the cone in bearings 107. When the 9 by contractile spring 106. This causes arms 109 to swing in an angular plane and to move sleeve 108 longitudinally on shaft 9( W'thin the flange or sleeve 108 rests one arm of the bell-crank lever 110 pivoted at 111, the other end of which is pivotally connected to a rod 112. This rod is pivoted to another pivoted lever 113 having a nose 114 adapted to engage the dog 98 and thereby free the clutch 93 in the manner before described. The dog 98 for this purpose is pro vided with an arm 98 projecting down wardly from the rear of the dog spindle 115 which is operated by the nose 114 of the lever 113. The nose 114- ispivoted to the I lever 113 and provided with a sto 116 which. holds the nose rigidly when the 0g is operlessened centrifugal force exerted on weights 106 permlts them to be pulled toward shaft ated and permits the nose torepass the dog for the purpose of being reset, a spring 116 urges nose 114 to normal position against stop 116.

The worm 91 on clutch shaft is preferably provided with ball bearin s 117 to take up the end thrust of the sha t. The feed nut or worm gear 92 is housed in a bearing 118 provided with ball bearings 119 at each end to take up the end thrust. Thesc bearings 119 are adjustably set by-a series of screws 120 in the cross ties 121 onbothsides of the gear. gated to give a stead rigid bearing to the gear or nut. The fee screw 122 is fixed and bolted ateach end at 123 to the ends of the table 2. The hubs of both gears91 and are carried by the

bearings

118 and 119.

The casing 88 which houses t2; clutch worm and

gear

86 and 87 is attac ed by an circular flange 121 to a seat turned on the face of plate 125. This plate 125 carries the journals of theworm 91 and is centered b a hole bored out in the Web of thebedan secured to a circular seat by bolts 127. The

The hub of gear 92 is elonrear journal box 126 of shaft 90 fits a. hole bored in the bed which serves to. both; sup g .the table 2 a tendency to slide crosswise gf I the bed, the effect bringing the wear against 9 the gib- 130.' The adjustable gib 131 ofrthe pair I prefer to locate at the low sideof the bed-ways 129, it being easier to ad ust in that position.

The housings are bolted to tlio bed by 139 bolts, as-132, which reach from side to side. Itis usual to connect each housing to'the side of the bed only.

133, on the bed-cheek, while rigid1ty is further secured by the interposition of a l wedge gib 134, see Fi 18, preferably heldv in a ce by a screw an washer. nthe vertical adjustment of the spindledrive and its cross-rail, it is preferredto I nest, for the purpose of taking up the motion of the power-drive pulley gradually and without shock, the same functlon bein performed by the clutch' devices of the fee ear nest.

While this invention has been described 6' in connection with the particular mechanism this specification, itshould be distinctly unillustrated in the drawings accompanying derstood that the invention is not confined to the special devices shownvand described.

' 1. In ,a machine tool havin The invention is of much broader application and embraces all mechanism covered by the following claims. v 1 I t y By the employment o1 the circular plate- 125, s'eatin am enable upon the circular flange 1241 to assemble the shaft 90, the worm 91, the worm-wheel 87, and the housing 88 carrying the clutch devices so that all this portion of the machine may be assembled and placed as a unit in its proper posi' tion whereby the parts are quickly 'alined and-the construction standardized. p v

What I claim is,-

elements to receive a cutting movement an a feed movement, a power drive for the cutting movement, an independent power'drive for the feed movement, and means controlled by one ofthe drives and arranged to act'on its retardation to stop the other drive.

2. The combination of a reciprocable table, a'tool holder, a revoluble tool carried by said holder, apower drive for said 'tool,

a separate power drive for said table, and

. automatic means controlled by the tool drive and arranged to act to immediately stop said table drive when the tooldrive is interrupted. i 3. The combination of a reci rocable table, a tool holder, a revoluble too carried by the holder, a power drive for said tool, a

separate --power drive for said'table," and means controlled by the tool'driv'e and arranged, to immediately stop the table drive ble, atool holder, a revolubletoo carried by.

upon reduction of the speed of the tool below a certain oint. v

4. The combination of a reci rocable tathe'holder, a power drive for the/tool, a separate power drive for the table, and automaticj means controlled by the too'l drive and arranged to act upon interruption of the Each housing is shouldered both at the top'and bottom, as at provide the clutch gears 27 with s rings similar to the springs 68 of the fee -gear clutch, in en tool drive to immediately stop the table drive.

- 5. The combinatipn of a reciprocable table, a tool holder, a tool revoluble therein,

driving'mechanism for impelling said tool, 70

independent driving mechanism including change speed gearing for impelling said table, and automatic mechanism intermediate the tool and table driving mechanism constructed'and arranged to act upon inter-ruption of the tool drive to immediately stop the table drive.

6. In a machine tool comprising a work holder and a tool which is-to be given a cutting movement and a feed movement in relation to the work, a power drive for the cutting movement, a power drive for the feed movement, a clutch interposed in one of said drives and means controlled by the other drive and arranged to act immedi- '85 ately upon interruption of said drive to disconnect the clutch.

7. In a machine tool having a work holder and a tool which-is to be givena' cutting movement and feedmovement in 9Q relation to the work, a power drive for the cutting movement, an independent power 0 drive r the feed movement, a clutch interposed in the power drive, a trip device for disengaging said .clutch member and cents trifugal means controlled by the cutting drive and connected with the tri and arranged to act on interruption of t e cutting drive to actuate the tri v 8. The combination o a reciprocable table, a tool holder, a revoluble tool carried thereby, driving means for impelling said tool, independent driving meansfor impel I lin said table, a clutch intermediate said tab e and said tablet-impelling meansfor connecting and disconnectin said table and impelling means, means ten ingcontinually to disengage said clutch, adetent normally 1 retaining said clutch in -engagement,I and mechanism controlled by "the tool driving means and-constructed and arranged ,to "release the detent andpermit disenga omen-t of the clutch upon intrruption'of s ud, t l drivin means.

ble a revoluble tool, a power drive for. the

i fo

9. T e combination of are'ci-procable ta- 1 tool, an independent power drive for the table, a clutch interposed in the table drive,

means tending continuousl to disen age the clutch, a detent 'norm'al y retaining the agement, a trip 'adjustably i shaft engaging the worm gear, thrust bearings for said worm gear and a housing 'confprising journals for said shaft and abutments, for said thrust bearings, secured as a unit in the bed.

1 1. In a milling machine the combination of a reciprocating table, a non-rotating main screw carried by the table, a main rotating feed nut upon the main feed screw, aj wcrm meshing with said nut, a shaft upon which said worm is mounted, a gear loosely mounted upon said shaft, a clutch device upon said of a reciprocating table, a main feed screw,

a main feed nut, a worm meshing with said nut, a shaft upon which the worm is mounted, a circular plate having bearings for said shaft at its mid-length, inner bearings for said shaftcarried by said plate, and outer bearings concentric with said circular plate. 14. in a milling machine, the combination of a frame having a recess formed therein, a circular plate fitting said recess, provided with a bearing, said frame having a second bearing concentric withsaid recess and a housing having a shaft bearing concentric with the other bearings and secured to said plate.

15. In a milling machine, the combination of a frame havin a comparatively lar e recess on one sidb and a comparative y smaller recess upon the opposite side, a casting having bearings for a shaft and adapted to fit said recesses, a shaft in said bearings and a worm upon the shaft between the bearings and said recesses.

16. In a milling machine, the combination of a frame havin a comparatively large recess on one si e and a comparatively smalle-nreccss upon the opposite side, a cast ing having bearings for a shaft and adapted to-fit said recesses, a shaft in said bearings, a driving member upon theshaft between the bearings and said recesses and a gear housing carrying a bearing secured to said casting concentric with the bearings therein.

17. In a milling machine, the combination of a base, a reciprocating table carrying a feed screw, a mainfeed nut rovided with a gear thereon, a worm and s aft for drivmg said nut, a housing constituting an 1ndeerases pendent unit secured -in the base, bearings in at said housing for supporting said shaft, bear ings for the feed nut and connections between the feed nut bearings and the housing of said shaft for supporting the bearings of the feed nut.

18. .In a milling machine, the combination of a base, a reciprocating table havinga feed screw attached thereto, a housin constituting an independent unit secured in the base, a feed nut rovided with a ear, adjustable end-thrust earings for the eed nut carried .by said housing and adjusting means mount ed uponthe frame at each end of the feed nut bearings. Y

19. In a milling machine, the combination of a cutter spindle drive, a fixed arm or support carried thereby, a weight movably secured to said support, a sleeve movablev upon the cutter s'pmdle drive, an arm con-j .nected to the weight and sleeve, a feed mech-v anism, a clutch in the ,feed, mechanism for a clutch therein and means interposed be-v tween the centrifugal-Weight'andthe clutch whereby the feed is arrested when the cutter drive spindle stops.

21. In a milling machine,'the combination 1 i of a feed mechanism, a clutch in said mach anism, a cutter drive spindle, a support fast thereon, a centrifugal wei ht mounted u on an arm pivotedjupon sai support, a s idable sleeve upon the cutter drive, an arm ongagin said sleeve and connected to said ce'ntri ugal weight, a lever adapted to operate the clutch, a bell-crank lever connected with said sleeve, and a link' connecting said levers whereby the feed is arrested I by the stopping of the cutter drive.

22. In a milling machine, the combination of a reciprocating table, a trip thereon, a, feed mechanism having a-clutc'h thereima bed, a lever having a clutch element thereon and a jack in-the-box mounted on [the bed adapted to engage the table trip and the lever of the clutch mechanism.

23. In a milling machine, the combination of a bed, a jack-in-the-box mounted thereon,

having an upwardly projecting arm and a horizontally projecting arm provided with an inclined face, a reciprocatmg'table hay? inga trip and feed mechanism and a later having a clutch device and an arm in contact with said nclined face. I

2a. In a milling machine, the combinationof a bed provided with'upper and lower horizontal bed-cheeks, housings sliouldsred upon said cheeks, tie rods passing through hollow hub of said cutter with a recess 10 the housings and bed from side to side, and formed in said spindle.

gibs interposed between the shoulders and In testimony whereof I have nflixed my the cheeks. slgnature 1n the presence of two \vltnesses.

2. I u T 5 o n mlllm maehme, the eonlbmatlon HELYRX HESS.

of s drive'spindle, a flange thereon, a millmg cutter havmg a flanged hollow hub W1tnesses:

adapted to be secured to said spindle flange, W lNl-IELD S. KoLB, and a centemng plug SGIVlIlg to center the FANNIE V. KUR'rz.