US1775005A - Multiple drill - Google Patents

Description

MULTIPLE DRILL Sept. 2, 1930.

Filed April s. 1927 7 Sheets-Sheet 1 INVENTOR zlsATToRwEY Sept. 2, 1930. osc I 1,775,005

MULTIPLE DRILL Filed April 8. 1927 7 Sheets-Shea 2 INVENTOR M667 Z305 ah Sept. 2, 1930. 'A. TROSCH 1,775,005

MULTIPLE DRILL Filed April 8, 1927 7 Sheets-Sheet 3 INVENTOR fiasci f %ATTORNEY Sept. 1930. A. TROSCH 1,775,005

MULTIPLE DRILL Filed April 8. 1927 1 Sheets-Sheet 4 i f 53 36" I I 47 L J l 6 35 l i g M I g I I l 2 53 520507;

Sept. 2, 1930. A. TROSCH 1,775,005

MULTIPLE DRILL Filed April 8, 1927 7 Sheets-Shed; s

/73 INVENTOR g e %M v %isATT0RNEY 1 l Sept. 2, 1930. f A. TROSCH 1,775,005

MULTIPLE DRILL- v Filed April 8. 1927 7 Sheets-Shut: 6

IIIIIIAEEVII/IA w 6'6 INVENTOR @ATTORNEY A. TROSCH MULTIPLE DRILL Sept. 2, 1930.

Filed, April 8,- 1927 '7 Sheets-Shem 7 ATTORNEY w ru Patented Sept. 2, 1930 nmyrsnfSTATES PATENT FF CE. *i:

ALFRED TROSGH, OF ROCHESTER NEXV YORK, ASSIGNOR TO CONSOLIDATED MACHINE TOOIpGORlOBATION OF AMERICA, OF ROCHESTER,- NEVJ YORK, A CORPORATION OF DELAWARE 1 {MULTIPL DRILL Application filed April 8, i927. Serial No. 182,105.

, This invention relates to a multiple drill,

with more particular reference to the type of machine adaptedfor drilling holes in the webs of rails. i

A primary object the invention isto provide a drive mechanism which will permit'easy and; close adjustment of the drill spindles toward and from each other without necessitating any changes in the posltlon .of the drive'mech anism, or; causing interferance ofany parts.

tures being pointed out .A furtlierobject of the invention is, to pro vide mechanism of. simple formwhich-will stop the feeding ofthe drills when they reach a predetermined point, by automatically disconnecting gears in the feed mechanlsm. Y

, Another object of the invention is to produce a mechanism possessing extreme simlicity of design, and greater ruggedness, durability and efficiency than prior types of ma,- chi nes of this class.

To these and other ends, the invention consists in the form and arrangement of parts that willappear clearly fromthe following description, when read in conjunction with the accompanying drawings, the novel feain the claims following the specification.

Inthe drawings: 7 l

Figure 1 is a front elevation of one embod1- mentof theinvention; a v

F'gure 2, is a side elevation thereof;

Figure ,3 is an enlarged partial front ele- "vationl showing the drill spindles adjusted Figure is a vertical section'through the feed rack and pinion taken approximately on the line/7 of Figure 5; I c

Figure 8 is 'a' vertical section through the feed mechanism takenon the line 88 of Fig ure 6; j V

Figure 9 is a sectional view similar to Fig.- ure 8 showing the controlling gears of the feed mechanism in disengaged position;

Figure .10 is a view partly in plan and part- I numeral 20 indicates the bed of the machine onwhich is mounted'the integral frame comprising an'upright 22 and a work support 23 which is wider than the upright 22 and holds the rail or other work to be drilled. The

vertical sectional view" 7 frame may be adjusted relative to the bed 20 by means of a rack and pinion connection consisting ofa rack 24 fixed on the bed and a pinion 25 mounted on the frame, the pinion being turned by a suitable tool applied to'the shaft 26 thereof. When properly adjusted, the frame is clamped tothe bed by T-headed bolts 27 engaging the usual slots in the bed.

On the front of the upright 22 is mounted a vertically slidable carrier 28 provided with horizontal guides 29. On thefront of the" carrier 28 and a little to-the leftof the center. a

is fixed a housing 30, which forms a bearing fora drill spindle 31. This housing may be attached to the carrier 28 by means of bolts 32. v To the left of the'housing 30 is a housing 33 carryinga drillspindle 34, this housing not being rigidly attached to the carrier 28 but being secured by bolts 35 to a suitable slides movable in the guides 29. An extension 36 may be provided at one side of the housing to provide a broader'andfirmer bearing against the front of the carrier. Alongscrew 37, mounted upon the carrier 28, is threaded through a h le in'a lug on the back housing 30, these housings being adjustable tight against each other, as shown in Figures 3 and d, when it is desired to drill holes a minimum distance apart.

To the right of the stationary housing is another movable housing 39 carrying a drill spindle 40 and attached by bolts 41-to slides working in the guides 29. A long screw 42 serves as a means for adjusting this housing back andforth relative to the stationary housing 30 in the same way in which the'screw 37 adjusts the housing 33. The housing 39 is notched at 43 opposite the bolts 32 in a manner similar to the notches in the housing 33, so that this housing 39 may be placed tight against the housing 30 in the position shown in Figures 3 and.

.To the right of the housing39 is another adjustable housing 44 carrying a drill spintile 45. This housing has a broad extension 46 similarto the extension 36 and is attached by bolts 47 to slides working in the guides 29. A long screw- 4-8 adjusts this housing in a manner similar to the other housings heretofore described. The edge of theghousing 1% is notched at 49 opposite the bolts 41 so that it may be placed close to the housing 39, as shown in Figures 3 and 4, when it is desired to drill holes'a' minimum distance apart.

It will be seen from the construction here tofore described that Ihave provided a plurality of drill spindles easily adjustable by means of screws so as to drill holes at any def sired distance apart within the maximum and .minimum limits of the machine.

' The drive for the drill spindles will now be described, reference being had particularly to Figures 1, 2, 3, 5, 11 and 12. To the top of "the upright 22 is secured a bracket 50 having near its front a portion 51 of approximately the same width as, that of the carrier 28. Formed in this portion are longitudinal slots 52" forming guideways for a purpose hereafterdescribed. Mounted in suitable bearing's 5d at the left hand end 'ofthemeinber 51 are two parallel shafts 55 and 56 geared together so as to rotate n unison by means of the gears 57 within the housing 58. One of motor" 62, the drive shaft of which carries one or morepulleys'63 for driving the belt 60, asshown especially in'Figures' 1 and 2, The

free end of the shaft 56 may be provided with an outboard bearing 64 in the nature of a bracket extending from the side of the member 50. v

The drill spindles heretofore described may be operated in any suitable manner, and in the form of the invention shown in Figure 1, they are operated from the drive shafts 55 and 56 through worm gearing comprising worms 65 mounted upon the drive shafts and cooperating with worm wheels66 on the drill spindles. Keyways 67 extend approximately the full length of the shafts 55 and 56, and it will be understood that the worms 65 are loosely keyed on these shafts so as to be slidable lengthwise of the shafts, though always rotating therewith. Similar long keyways '68 are provided on the drill spindles, there being preferably two keyways diametrically opposite to each other. The worm wheels 66 driven by the worms 65 are likewise loosely keyed upon the drill spindles in such a manner that they are movable lengthwise of the spindles but that any rotary motion imparted to the worm wheels will be transmitted to the drill spindles. Around each worm and worm wheel is a housing 69 for keeping the worm and worm wheel in proper cooperative relationship to each other. Each housing 69 has flanges 7 0 which may be adjustably attached to the member 51 by T-headed bolts 71 fittin in the slots 52.

By reference to Figures 1 and 3, it will be seen that two of the spindles are connected to the lower drive shaft 56 while the other two are connected to the upper drive shaft 55, adjacent spindles being connected to different shafts. The purpose of this arrangement is so that the spindles can be adjusted to acloser position than would be possible if they were all driven from the same shaft. The width of the gear housings 69 is necessarily considerably more than the width of the spindle housings 30, 33 etc., heretofore described, and unless a staggered drive such as I employ is used, the minimum distance at which holes could be drilled would be limited by the width of the gear housings 69 rather than by the width of the narrower spindle housings 30 etc. spindles at approximately their maximum Figure 1 shows the drill distance apart while Figures 3, 4 and 11 show them at their minimum spacing. It will be noted, especially from Figures 3 and 11, that in this positionthe spindle housings 30, 33, 39 and 4 1- are tight together and the gear housings 69 mounted on the same drive shaft for driving alternate spindles are likewise tight together, but the sides of the gear housings are cutaway as at 72 in Figure 11 to provide clearance for the drill spindles which are driven from the other driving shaft.

It will now be seen that I have provided a simple and effective drive for a plurality of drill spindles and one which permits easy 7 adjustment ofxthe spindles t'oi drill holes various; distances apart; 111:. Order tov adjust the machine for holes at different positions,

it is necessaryonlyto loosen:thebolts'35,;41

and 47 holding the .spindlehousings, and the bolts 71 holding the gear housings. Thescrews"37,%42: and 48n1ay then be turnedto bring the spindles 'to gthedesired positioni' The movement of theispindles williresult in sliding the housings 69' and their worms 65 along theirndrive c-.shafts, :and' when the spindles have been brought" to the' desired position, the bolts Linay again be tightened and the machineis ready for use. lIlJ'Wlll be seen thatit is not necessary to take a-ny gearv mg apart, to} disconnect any shafting, or to] go through any "other coniplex' operation's.

The only tool necessary toset the drill,

spindles forany desired spacing is "arwrench for loosening Y and tightening :the bolts"; and for turning tlie'tadjustingscrews", v J The feeding device, or mechanism forfeeding; 1 the drill spindles; longitudinally, c will nQWbe described. Referring particularly to Figures 2an'd 5,,ithe front edgeof the upright is providedwith guides73 which cooperate with guides'on the'carrier 28,.heretofore mentioned, so .-that the1 carrier. 28 is; vertically "movable; A vertical-recess 74 1s formed in the front, of-the upright 22, and in this recess is arackbar '75 secured lug bolts 7 6 :to the 7 carrier 28.] A shaft 77 rotatingin'suitable bearings in the uprightQQ carries a pinion? 8 chine where it is journa'lled in ca suitable' meshing vwiththeg'raclcbar -75i freferably this pinion isi fo'rmed integrally with the shaft 77- by milling teeth onthexsame.- {The shafth77 is extended to the rightof the nia-v bracket or housing 79, 'and;it carriesiaworm wheel 80.' ,Below and at rightiangles to the shaft 77 is another shaft'Sl having 3 a spur the gear 82-onthe shaft 8l. The shaft 84 also carries a worm 86 which 'mesheswithfhe worm wheel SO when the swingable frame'is in its uppermost position as shown in Figure 8. Inthe-recess 87in the housingv79 is a lock ing-b olt 88' pressed outwardly by a springt8 9; A notch 90 in the upper edge of this bolt cooperates with a corner 91 on the-swingable frame83, to hold the frame in its 'upper posi tion as shown in Figure 8,;and'1t is obvious h that the frame cannot lee-lowered until the bolt 88ispushed'ii1warcl. Toassist the force of Y gravity in lowering the swingable frame 8 when it has been released by the locking-bolt,

V aspring-pressed plunger 92may be mountedr u on the fra-inesoras, to ressa ainst a lu 7/ V t! Y- ,b

'93on the housing and thus'exertalconstantj spindlesfandnot rigidly fined theretoi f v {Automatic stop; mechanism for stopping tendency to shove the'swingable'framedowne Thisifeed'ng mechanisnimay be driven" by any suitable means, SLlCl'l flS by a separate motor or by any suitable form, of connections froin the main drive motor? ,Pr'eferably I "drive the inechanisni from the spindle drive shaft 55, 'which is eirtended t-oithe right-of the I machine and provided with a bearing 94 at thesidemofpthe meinber "51, as shown in Figures 1 'andfQ/At its end the shaft55'is provided with a pulley 95 which, through a 1 belt 96,"dri'\ esa pulley--97 onthe short-shaft v98 'mounteclon-abracket on-the rear "of the I housing '19: This shaftic'arriesi'a spiral gear .99 driving another spiral ge ar l OO on the end of the shaft'81; Thus motion is transmitted from the main driving motor to the drive; shaft 55 in the manner described abo've,' and from 55 to the shaft 98 through the belt 96.

The shaftQS: rotateslthe shaft 81 which through gears 82 and 85'r'otate'sthe shaft 8 f mounted inithe swingabl'e frame-835 c-When the swing'ablefraine is in its normalor upper most position, the"w,o1' m86 carried by the shaft 8 lidrives the wo r nlwheel 80'onith'e shaft 77, thus rotating'atheipinion 78 to move the rack to feed the. meniber'28idown:-'

Ward, forcing thedrill'slinto therail or other work being operatedgupenm It will be under; 'stOOdthatTduring this feeding operation the drill, spindlesslide"downwardTthrOugh the housings 69 'but aremeanwhilebeingrotated.

.by the gear's.66,,' this*being.possible'because 7 the gears 66 are loosely laymen-aw drill the feeding operation at any' desired point may beusedi-I Preferably I employ theform 1 V illustratedinFigures l and, 3 in which aivei .tical rod 101 i's mounted at onexend .in the bracket 102 on the liou'sing79, the other end e-Xtendingthrough an openingin a lug 103 on i the'icarrier z8 A spring lOelsurrounding the shaft 101 betweei1the bracketlOQ and a collar 1 lO5'keeps the shaft 101' normally elevatedi g 7 A eollar 106 is secured on the'shaftby-means-I i of a set screw and maybe adjusted to anypositionthereon in order to changethe point V I i p atfi'which the feedi-i's stopped, :Duringthe feeding operationof.the-'drills,"carrier 28 p v carryingthe drillhousingsanddrill spindles v moves downward 'until "finally thelug- 103 c J comes in contact; with the collar 1 106, thus forcing the shaft lO-ldownward. .The bottom f of this shaft. rests up'onran arm 107 fixed to a shaft 108 and thus t1'1e shaft108 is rotated c slightly-when the lug-103eornes in co ntact i with the collar. The shaft 108 extends through thehousing 7 9 and is journalledthereinl At a point oppos tethe' locking bolt it carr es a cam 109,.sliown in Figures 6, 8 and 9.-iVVihen the shaft 108 is ret ated in a, clockwise "direc ction,,asseen in Figures san 9, itwill forcej, the locking bolt-2" 88 inward; and allowythe the lowerpart thereof. When'the cam reaches g the position-shown in F igure.8,-the Worm frame 8? :to drop down to the position shown ,inhFigure 9, further downward movement thereof being prevented, by contact of the For returning thelcarrier 28 and the drill spindles upwardly,'a hand wheel is provided; This hand-wheel ismounted on a shaft 111 iournalled in an extension on the cover plate .112 of the housing 7 9.1 The shaft carries a bevel gear 113 meshing with a bevel gear 114;. fixed to the shaft 77, as shown in Figure 5. Thus upon rotation of the hand wheel 110 in' the proper direction, the shaft 77 rotated and the carrier '28is elevated to the proper position prior to beginning a 5 newdrilling:operation. Rotation of the hand wheel 110-in the opposite direction will move 25 the carrier 28 downwardly, and thusthe drills f maybe fedby hand if for'any reason it is desired not to use the automatie feed. The

weight of the carrier 28 and of the housings and drill spindles and other parts connected thereto isv counterweighjted by Weights (not shown) Within the space in the upright 22.

Ahandle134 atthefront end of the shaft 108.is used formeshing the Worm 86with the worm wheel 80,: when it is desired to start itsnormal position.

lithe automatic feed. This handle is moved to rotatethe shaft in a counterclockwise di 3 reetion, as "seen in Figures 8 and 9, and as will'be apparent from Figure 9, the counterclockwise rotation oflthe cam 109will raise the swingable frame 88 by contacting with and wormwheelxwill be properly meshed and the locking bolt 88Will be pushed outward by its spring 89 to lock the swingable frame in Obviously, thehandle 134 may be used to rotate the shaft 108 to stop the automatic feed nism 103,106," above described.

atany tirne" desired, without waiting for it to be stoppedautomatically by the mecha- Sincethe swingable frame is pivoted about the shaft 81" asa center, it is obvious that the gear82 on the shaft-81 will always be proper- I 7 1y 'meshedwith the, gear 85 on the shaft 84' carried in the swingable. frameno matter in.

what position'th'eswingable frame may be.

'.'.:The bearingsfor the various shafts and Ys'pindles'have not'been particularly alluded to in-the foregoing descriptiom'since it is understood that suitable bearings, preferably I ofanti-friction ty'pe,,are provided. through out Ball bearings 116, Figure 4, have been shown inconnection with-the drill spindles, and bfifililllg s 117, Figure 111 G011- nection with the worms for driving the drill spindles, but it should be understood that ball hearings or roller bearings are preferably used at allpoints at which considerable friction occurs. Lubrication is, of course, provided for all bearings through the machine. I have not shown any particular form of lubricating means, since any well known means may be'used. Preferably,I make the housing 79 oil tight so that the feed worm and Worm wheel may run in a bath of oil if desired. Where the shaft 108 extends through the wall of the housing 7 9, it is therefore provided with packing held in place by a gland121. The lower ends of the drill spindles are providedwith the usual drill chucks 118 hold.- ing drills 119. V i r In Figures 1, 2 and 10, I have shown mechanism for accurately positioning the rail or other Work to be drilled with respect to the drills. This mechanism comprises a backblock 122 which may be adjusted by means of nuts 123 on screws 124 extending through lugs 125 on the sides of the upright 22. When adjustedto the desired position, the block may be further held securely by tightening the lug bolts 126. At the front of the support 23 is a bracket 127 carryinga screw 128 provided at oneend with a handle 129 and'at the other end bearing against a block 130, thus forminga vise for clamping the rail against the back-block 122. At the right hand side of the machine, a similar bracket 131 carries a similar screw 132 having a handle 133, thisscrew forming a convenient means formaking a very fine longitudinal adjustment of the railor other material to be drilled.

' In Figure 13, I have shown a modified form of drive for the drill spindles. It should be understood that in this form of the invention the spindle housings, the feeding mechanism, and other details of the machine are as heretofore described, but the driving pulleys on i the motor 62 are placed at the right hand side ofv the machine instead'of at the left. A belt connected to a pulley on the motor shaft drives the pulleys on the shaft 151 mounted insuitable hearings on the bracket 51, this shaft forming an actuating member for the .drive mechanism. An'outboard bearing 152 .may be provided at the end of the shaft 151 outside of the pulleys 150. Operating gears 158 within the housing 154: at the right hand side of the machine rotate two drive shafts 155an d 156 from the actuating member.

Similar gears at the other end of the member 151 within a housing 157 rotate two other drive shafts 158 and 159. Each of these four drive shafts 155, 156, 158 and 159 have a keyway running substantially the whole length thereof, and these shafts are not fixed rigidly to their operating gears but are slidable longitudinally through the gears. Each of these f ur shaft ca ries at the and nea est the ter of the machine a bevel gear 160 fixed to its respective shaft. Each bevel gear meshes with a bevel gear 161 on one of the drill spin dles 31, 34, 4L0 and 45. The bevel gears on the drill spindles, however, are not fixed rigidly to the spindles but are loosely keyed thereto and slidable longitudinally thereon to permit the spindles to be fed downward through the bevel gears. A housing 162 surrounds each pair ofbevel gears 160and'161 and holds themincooperative relationto each other. Flanges or extensions 163 on these housings bear against the front of, the bracket 51 and are secured thereto by T-headed bolts 16st engaging in the guideways 52." It will be noted that the corners of the housings 162 are cutaway, the walls 165 being formed at an angle. ,The angular walls of adjacent housings are formed in opposite directions or com plemental to each other. For instance, the

housing connecting the shaft 158 with the spindle31 is cut away at the lower right hand corner while the" housing connecting the shaft 155 with the spindle 401s cut away at its upper left hand corner. This avoids interference between the twohousings when it is desired to adjust these spindles to their minimum distance apart, since'the housings can be moved very close together until the faces 165 are almost in contact with each other, one housing being positioned partially beneath the other. In order to obtain this arrangement, it is necessary to place one of the spindle bevel gears 161below its driving gear 160, while thenext spindle bevel gear on the adjacent spindle is above its driving gear,

thus permitting the housings 162 to be moved sideways when the spindles and their housings are adjusted to the desired position by the screws 37, 12 and 48. In this form of the invention however,-the driving gear does not slide upon its driving shaft as the spindle moves to its new position, but on the contrary, the driving gear 160 and its driving shaft both move in unison during the lateral movement of the drill spindle, thus pulling or pushing the driving shaft in one direction or the other through the gearing 153. The driving shafts 155,156,158 and159 are of sufficient length to reach from the gearing 153 to their I I of'pairs-ofdrill spindles all'arranged ina' respective drill'spindles when'the spindles are crowded together in their closest possible position. When the spindles are moved toward the sides of the machine, however, so as to bore holes at greater distances apart, the driving shafts 155, 156, etc, simply extend on past the gears Y153 and project slightly at the sides. of'the machine,as is clearly shown in the figure,

- In this form of the invention, the feed mechanism drive pulley 97' may be driven by a belt from the pulley 166 mounted on the shaft 151 between the pulleys 150 and the housing 154. i

It will now be apparent-that I have disclosed a multiple drill of sturdy and durable construction, and having a simplified drive mechanism of few parts, and arranged to permit easy adjustment for drilling holes at different distances apart. I have arranged the mechanism especially so as to decrease the minimum limit at which holes can be drilled, and I have provided means for adjusting the drill spindles easily and quickly to any setting required. The adjustment is very simple, requiring no other'tools than suitable Wrenches. a j

Also I'have provided an automatic feed mechanism for feeding the drills, which is stopped automatically at any predetermined I point and which may be easily returned to its initial position. I

IWhile I have shown certain specific embodiments of my invention, I do not desire to be limited to the precise details disclosed, but intend to cover. all modifications and equivalents thereof fallingwithinthe purport of the invention or the scope of the appended claims." -Iclaim:' e c v 1. A multiple drill comprising a series of drill spindles all arranged in a singlelver-- tical' plane and adjustable toward each other in said plane into juxtarelationship, a separate drive shaft foreach spindle disposed at right angles thereto in the same vertical plane therewith and in different horizontal planes to permit close adjustment of the spindles, and operative connections between sald drive shafts and spindles comprising gears fixed on the drive shafts meshing with gearsslidable on the spindles. i

' 2.1 1 multiple drill comprising a series of drill spindles all arranged in a single vertical plane and adjustable toward each other in said plane into juXta-relationship, a separatev drive shaft for each. spindle disposed at right angles thereto in the same verticalplane therewith and in different horizontal planes to permit close adjustment of the spindles,

and operative connections between the drive shafts and spindles, said drive shafts being longitudinally movable with the spindles and having gears fixed thereon meshing with 7 gears slidable on the spindles.

3. 'A- multiple drill c'omprls ng a plurality single vertical plane and adjustable toward each other in said plane into close juxtar'elationship,v a separate drive shaft for. each spindle disposed at right-angles thereto in the same vertical plane therewith and extending in opposite-directions from the'spin A dles topermit adjustment of the latter, the

drive shafts being longitudinally movable with the spindles during adjustment but fixed against feeding movement while the drill spindles are movable axially with reference to the'drive shafts for feeding, and operative connections between the drive shafts and spindles. I

4. A multiple drill comprising a plurality of drill spindles all arranged in the same "vertical plane and adjustable toward each other in said plane into close juxtarelationship, a separate drive shaft for each splndle disposed at right angles thereto and in the same vertical plane, thedrive shafts for the inner spindles being located in a different horizontal plane from the drive shafts for the outer spindles and the drive shafts in each horizontal plane extending in opposite directions from the respective spindles said drive shafts being movable with the spindles during adjustment, and operative connections betwen the drive shafts and spindles.

5. A multiple drill comprising a plurality of spindles all located in the same vertical plane and adjustable in said plane into juxtarelationship, a' separate drive shaft for each spindle extending at right angles thereto in said vertical plane, gearing slidable on the spindles but fixedly relatively to the drive shafts for connecting said drive shafts with v the spindles, and housings for the gearings between the drive shafts and the respective spindles, said-housings being complementally formed to permit one housing being located partially beneath the other housing when the spindles are adjusted close together.

6. A multiple drill comprising a'plurality of drill spindles arranged in the same vertical plane and adjustable in said plane in juxtarelationship, a separate drive shaft for each spindleextending at right angles thereto and in opposite directions in pairs and located in said vertical plane, gearlng connecting the drive shafts and spindles, the drive shafts being movable with the spindles during. adjustment, and housings surrounding said gearings and having inclined Walls in parallel relationship and positionable one immediately under the other when thespindles are adjusted close together, said drive shafts being fixed against longitudinal movespindles during adjustment of the latter, a

bevel gear on the inner end of each drive shaft and a mating bevel gearon the corre sponding spindle, the last mentioned bevel gears being disposed respectively above and below the drive shafts to permit adjustment of the spindles into close relation with each other.

8. A multiple drill comprising a series of drill spindles all arranged in the same vertical plane and adjustable into juxtarelation with each other, a separate drive shaft for each spindle arranged at right angles thereto in said vertical plane and movable Wltll.

said spindles during lateral adjustment of the latter, and gearing connecting the drive shafts with respective spindles, said spindles being slidably connected with said gearing and the drive shafts for the inner spindles being located in a horizontal plane above the drive shafts for the outer spindles.

In witness whereof, I have hereunto signed my name.

I ALFRED TROSCH.

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