US2392774A - Apparatus for drilling holes in cylindrical supports or the like - Google Patents

Description

Jan. 8, 1946. P. SQCHULTZE w 2,392,774

APPARATUS FOR DRILLING HOLES IN CYLINDRICAL SUPPORTS OR THE LIKE Original Filed April 29 1942 7 Sheets-Sheet 1 INVENTOR 404 Scxrazrzd' ATTORNEY K P, SCHULTZE Jan. 8, 1946.

APPAHATUS FOR DRILLING HOLES IN CYLINDRICAL SUPPORTS OR LIKE Original Filed April 29, 1942 7 Sheets-Sheet 2 INVENTOR Weaa San/007 ATTORNEY Jan. 8 1946. P. SCHULTZE 2,392,774

APPARATUS FOR DR'ILLING HOLES IN CYLINDRICAL SUPPORTS OR THE LIKE Original Filed April 29, 1942 7 Sheets-Sheet 5 202' v I fa/%r fi k L 1 27/ I /26 P P 2 25 INVENTOR 1904 Sex/oz: 725

2 ATTORNEY Jan. 8, 1946. i P. S'CHULTZE 2,392,714

APPARATUS FOR DRILLING HOLES IN CYLINDRICAL SUPPORTS OR THE LIKE Original Filed Apri} 29, 1942 '7 Sheets-Sheet 4 lNVENTOR Pqy 5c lit/A. TZE

ATTORNEY P. SCHULTZE Jan. 8, 1946.

APPARATUS FOR-DRILLING HOLES IN CYLINDRICAL SUPkORTS OR THE LIKE I 7 Sheet s- -Sheet 5 Original Filed April 29, 1942 INVENTOR R414. Sq/14725 Jan- 8, 1946- P. SCHULTZE 2,392,774

APPARATUS FOR DRILLING HOLES IN CYLINDRICAL SUPPORTS OR THE LIKE Original Filed April 29, 1942 Y'Sheets-Sheet 6 INVENTOR I040 Javarz MZZMWW ATTORNEY P. SCHULTZE Jan. 8, 1946.

. APPARATUS FOR DRILLING HOLES IN CYLINDRICAL SUPPORTS 9R THE LIKE 7 Sheets-Sheet 7 Original Filed April 29, 1942 i aw mvsmon 4 24a; JJ/MLTZE BY NEY Patented Jan. 8, 1946 PATENT F Fl cur-.1

APPARATUS- FOR DRILLING-HOLES INCY- LINDRICAL: SUPPORTS OR THE- LIKE Yaul SchulttaDanb'ury, Connz, assignor to Doran Brothcrsg'lncorporated, Danbury, Conn., a cor-' porationof Connecticut 1 Original application April29, 1942, Serial "N6.

1 441 ;0455' Divided and this application June 14; 1944,1Serial No.5405205 19 Claims.

This invention relates to anapparatus for drilling holes 'inzrcylindrical supports or: the "like, more particularly: to an apparatus r-for drilling successions of holes in the "cylindrical supports for rso-calle'd "pickerz-rollaa and IithllSi. to :prepare such:supports" i or the reception pf; pinspr the like.

This application isra division iof myappli'cation Serial No.; 441,045, fi1ed-'April'29',r1942.

One of :the objects of thisyinventioni is to provide ea; dependable and :pra'cticalapparatus for rapidly. and; efficiently preparing the hollow cylindrical suppbrtfor the receptionof the picker pins:and in aamannerzto'makeit; possible to provideo and: maintain: dynamic .zbalancee Another objectais to. provide an efficient apparatus; capable oi bperatingathighrspeed,iafortdrilling appropriately. :distri'buted :holes in; the picker roll: support for the reception ofethe'spickeripinsa. e

Another objectxis to :provide :an efiicient. and

dependable :apparatus that-zwill-"be capablegat 5- relatively high: speed of; drilling suitably distributed holes 1 through '1 the. a relatively thin" wall of :a .hollowcylindrical: support and'lwithi such holes having suchasubstantialiidentity of-sdistance -'of: the centers'rof mass of. the pins that they are ultimately :towreceive as will achieve "dynamic balance;

Another object -is to: provide an apparatus of the above-mentioned character that 'WiHzIb'e Of improvedrand compact iconstruction; of eifici'ent actionyrancl."well adapted :to meet the varying conditions :of; hard-practical use; Another object is in generalztoprovide improved apparatus capable: ofxhighlyefiicientr functioning gin --the artto whichritzpertains: Other objects iwillw-be in part obviousxominrpart pointedaout: hereinafter; v

Another objectis; to'provide anaapparatus for drilling "hbles:in:the;desired1 pattern; such: as in a IOWE'LOI'T.1OWS,": and: where the-drilling-ofthe holes iS I-tO befollowednbylputtingipins therein, to :proi videi dependable controls: for the *drillingoperations "as ewillibecapab-le of. effecting compensation for the time c-diiferentials"latiwhich the drilling andzpin'esetting opera-tionsiware' performed; Ali-- otherobject'is 1 0 provide; in such anapparatus, 'a dependable controlforshalting; the hole-forming operatiom at the completion of the-pattern and capable -=of such interrelation with 1 other controls as to permit: continuance of the --pi n.-assembling operation a; until the holes corresponding I to the oughly practical: anddependable and: which: will be capable-rot roperationwith -minimiun supervision; Another object is toprovide an apparatus of the justt-mentioned. 1 character in rwhich the controls are readily adaptable to varying requirements met with in practicaltuse: 1

The invention accordingly :consists -in-1 the. l features 'of---construction, combinations ofielements, and arrangements xof. parts as willbe (exemplified in? the structure to be -hereinafter describedeand the scope of. the application of whichwillbeindicated in the-;following;claims..-a v j r In theeaccompanying edraw-inga in which; is shown one of various i-possibleeembodiments of my invention, t g I t s .7

Figure 1 is a- .front elevation ofsthe complete apparatus;- r e -V Figure 12 is .=a plan view-thereonwithhcertain parts omitted :or broken away to Q-ShoW certain other .partsmoretclearly; 1 i I Figure-3. is ansend-elevation as seennfrom the left iniFigureri;

Figure his aasectionalvviewi as seen along the line 4-4- of Figure 1, certain. parts .beingsbroken awayor'omitted: a

Figure .5 is :a View as seen along the line 5+5 Figure 64s,. ardetached vertical'tsectional ..view as seenalong the .line -6- 6 ofrFiguresla e r Figureis an;elevation-Onea larger scaleshowe ;ingan illustrative formlof pins;v

or omitted, eshowing certain relationships =upon setting "theapparatus, to drill the first'hole; n I Figure 10-is. a plan-view oi the apparatusshown Figure 1 1 is -a.- frag mentary; ;view. asseen; along .ithe line vl l---| l of Figure s9; showing, certjain ,,of

the-parts as they are interrelatedli upon drilling the'first*hole-;-

s Figure :12 is anview like. thatot Figure lOQbut shows-the relationship of certain. oil the parts upomdrivinglof the-last pin;

. Figure 13 riszan end: elevation of transverse section as seenalong-the line! 31-43 of Figure 12,

Similar reference v characters refer; to .similar parts: throughout the severalviews oi the i drawlngsr. 1 v s Asconducive to, a clearer understanding .of certain features of this; invention, itwmight here be noted that, int the iur Vfelt industry, fib-lowing machines areiemployecllto :efi EClL separation from the 'desired lfuryfibresmof heavieriwfurn fibres and foreign or undesirable.,.. material like, piecesof skin;- and .-that in suchtmachines. there are remployedpicken rolls that hareto berdriven at high rotary' speeds, speeds. onatheiordere of 4,000 R: PaMx, the separatingaction above mentioned taking place; in: coaction with e othereelements, as

a resultof the highervelocity ..imparted to the particles-by the-rapidly revolving ,picker rolls. Insuch actions, the heavier orundeslred particles. or materials are caused to exert centriiugal forces sufiicient to discharge them tangentially away from the lighter or desired fur fibres, the latter being moved in the desired direction by air currents produced by the projecting picker pins of the high speed picker roll.

To achieve these actions requires high periphi eral velocities and I have found that where the picker roll diameter is on the order of 4", a drive on the order of 4,000 R.-P.-M. is appropriate where the picker pins are closely set and project from the picker roll for about A". The pins are preferably of metal, such as steel, and where projecting'ends are pointed the shanks may be plain or may have a multiple thread of large pitch thereon so as to cut their own thread when forced into the support. r r At these high peripheral velocities and with the relatively substantial size or mass of the pins, there-should be good'dynamic balance of the 'picker roll and such a secure anchorage-of the pins therein as to resist the centrifugal force tending to dislodge them, for loss of pins: would not only diminish the action and'efficiency of l threaded pathwayinto the materialof the sleeve 20-, the pin undergoing rotary movement in the the picker roll but also effect unbalance. Moreover, the pins are very numerous. To provide a practical, efficient and high speed apparatus for uniformly drilling holes for the pins to facilitate subsequent assembling and anchoring of such picker pins to a rotary picker roll element is one of thedominant aims of this invention.

A preferred and illustrative form of rotary base I for picker roll element for supporting and anchoring the .pins comprises a'tubular or sleeve-like elementiindicated generally by the reference character 20in Figures 1,2 and 5 of the drawings, being relatively thin-walled, made of a material of good tensilestrength, and preferably of'a'moldable material such as phenolic condensationi product, preferably with fibrous material such as layers of suitable fabrics embedded therein and impregnated by and bound together with the phenolic condensation product. The sleeve elefment, referred to in the claims also as a support.? may have an inside diameter of 2%, an

outside diameter of 31%;", making a wall thickness of Such as leeve element, either singly or several of them axially alignedfrnay be mounted upon a drum-like shaft of metal onto which it snugly fits and is sleeved and suitably secured thereto, and as so mounted may function in the above-mentioned fur blowing machines. The pins P preferably take a form like those shown in Figures? and 8, being preferably of metal; such as steel, 'andbeing dimensioned to have good points as at 2| and good rigidity to "resist the reactions of the mechanical forces exerted inthe blowing machine; thus, they may be of a thickness on the order ofe g.

They have shanks 22 preferably cylindrical in to provide it with holes H preferably arranged.

in one or morehelical rows, illustratively four helical rows, one of which is indicated in Figure at Rkanalogous to a multiple thread of substantialjpitcnthe holes, as is alsoindicat'edin Figure 5, extending completely through the wall of the sleeve 2!]. They should be uniformly distributed andmoreover the diameter ofthe holes 'H is somewhat less than the diameter of the process. Thetough character of the material of sleeve 29 thus causesit, in either case, to securely grip and envelop the shank of the pin when the latter is forced home, the shank becoming in efiect tightly embedded and securely anchored in'the material. The great number of pins are to beassembled to the sleeve with a security or anchorage like that above mentioned and moreover with their centers of mass equidistant from theaxis of the sleeve.' 1 The apparatus for effecting such drilling com- .prises' (see Figure 1) a base 25 withsupports'or legs 26, and upstanding from the base '25 are standards 21' and 28 of which standard 21 is rigidly and fixedly secured as by the screws 30 and -21 is rigidly anchoredas by a pin 35, a relatively heavy and strong shaft '35 whose opposite end enters a hole 3! in the standard 28, thus to support the right-hand end of the shaftfifi. g

Shaft 36 rotatably' and slidably supports a cylindrical structure of Which the 'r'ight hand portion is inrthe form of a mandrel 39 of a length appropriate to receive thereon the sleeve 2:: and of which the left-hand portion is' threaded as at 40, the portion 40 having thereon threads which in number and pitch correspond to the number and pitch of the rows of the holes H in the sleeve 20. Thus, where the latter is to have four rows orhelixes, portion 43 hasfour threads;'T T T and T Suitable means are provided for fixing the position of the sleeve 20 relative to the threads of element lll. Since, in the preferred construction of the above-mentioned picker rolls, I prefer to sleeve several sleeves 20 onto the driving and sup provide an annularshoulder 4| presenting at its right-hand end, as viewed in Figure l a step or cut-out of 180 extent with which the left-hand end'of sleeve 20 interfits and thus holds the sleeve 20' against rotation relative to the mandrel39, as is clear from Figures 1 and 2, and onto the end of mandrel 39 I may slip a collar 42 temporarily anchored as by a set screw 43 to hold the sleeve 20 against axial movement out of interlocking relation with the shoulder 4|.

V [By looseningup the hand nut 33, the standard 28 may be slipped off toward the right, leaving the shaft 36 supported as a cantileverfrom the standard 21, whence, .after' loosening the'collar 42, the collar and the sleeve 20 maybe slipped off V the mandrel 39 and right-hand en'd'of shaft 36,

to be replaced by another, by a reverse sequence ass-agave 3- grooves corresponding'also' in pitchjto that "of the four helical rows R R R "and R of the abbve 'mentioned' ho1s'-'H, this construction leaves *the cylindrical surface sub divided-" into a similar number "of-helixes 39 "which thus "present uniform]? distributed supports against which the internal 'face'of the-sleeve zfl' en gages. The structure -3a -4ll' may be' made' hollow-or *tubularf'if desiredjexcepting of'course' at those portions;-'such asthe ends, where'it'is bored to'a diametr 'to form'a sliding and'rotary'fit relative twth'efiired shaft-3s. I

The shaft 36 isof 'sufiicie'nt extent 'relative'to the length of the structure 39 -40togive a'range of sliding movement suflicient to"traverse the-enthe lengthof the sleeve 2t) "relative to two" points which, in order not -to "require-extensionpf "the range of "such" sliding movement; are"preferably displaced in an axialdirectionas little as possible; one of these points is atthe *locus of operation of adrill '46-(Figure -1) andtheotherkisatthe locus of operation ofth'e vertically m'ovablepinforcing device which includes aplunger 45. Conveniently," drill 46 "and plunger 45 "are*diametri callyjopposed (Figure being thus "spaced180 from" each other,"-andto achieve the above 'meirtioned preferred or "minimum-- spacing, they are axially displaced (see Figure'l) byardistance cor responding to half at-tumor theequally pitched helical groove 39*; Both drill 45 and "plunger 45, having their vertical axes intersecting the axis of the'mandrel 39 where the "pins aretobe positioned radially of the sleeve 20 are thus "juxtaposed to a'helical groove 39 in' themandrel"39;id1ill46 being in advance of 'the plunger 15 withrespect to the direction of rotaryji'movement of the man".-

drel and sleeve; that directionbeingasdndicated by thearrow in Figure 1.

Cfoacting" with the' threadedel'mentflfl is a block 41 having'adace -41? (Figure"2)" th'atis that has an arm 50 fixed to its otherllen'd, shaft 48 being supported in 'twoupstandin'g bosses 5i and 52 in-which it and the arms mayosclllate'as aunit and by which thi's'unitlisheld againstaxial movement. V r g Suitable means "are provided 'to hold"the'b1ock 4! in'engagem'ent withfithe threaded part' lll and such meanspreferablywcomprise a spring 53fconnectedto'arm 50 'land'to tan' arm 54"(Figures .2

and 3) se'oure'd'to ashaft' 55fsupported in bosses 53 and 5'! projecting upwardly from; the "base .25 likethe bossesji r-'52 that support'sh'att 49E c Shaft 55"canfswing in 'theibossesfifidl. but is heldagainst axial movement bythe engagement of immi lawithz'thebossjfi and bythetengagement ofiangamr "58 M11135.IOthBZ'Z'eDdQWithithEZbOSSfiI. Arms1a54 and 'I EB Eextend upwardly and :infiparallelisms (Figures 2; 3 and1 4 i andcin theiroupper 5 endszflfie'dly support theiends rof-i 'a holding pawl 60' -which,-being convenient]? in' the =form ofi'a square rod; presents throughout its ilengthywhich is1 -at 'le'ast' equal to the traverse stroke-pf f'the structure *39 -40; a"sing1e*tooth=like portionifo'r mam-0111mm: a toothed-ratchet wh'eel'B I mounted or formed: at the left-hand end of "the rotary and slidable structure 39 -405 Thus holding 'pawl 'fifl may 'coact withthe ratchet wheel 6 I at any point in the axial" movement of th'ewheel 6 I whose teeth are in numb'erth same as the number of'holes Hdesired to .be provided-"111 a single turnof the sleeve or of a 'helical row of holes;

Spring53'vvill'thus be seen to bias the threaded block 4! into engagement with the threads of partflfi andtobias also the holding'p'awl fill into proper coac-ti'on' withtlie ratchet wheel '6', and normally holds'eachofthemin its proper coact ing relation; But pawl fifl 'may' be disengaged from ratchet wheel-6i manually simplyby swinging it""away from=theratchetwhee1 and against the tension of spring 53- and in a similar way block 4Tfmay"=bemanually disengaged from the threaded part4!!! g v To the *left of ratchet wheel 61 as seen 'in Fig- 80 "tires- 1 and 2,"the*'structure -39 K! is "constructed 7 as alt-68; to-provid' a hearing-for the hub'64' 'o'f a bell cranklever E4 havi ng an' upwardly directed arm'GA hy 'whichis' 'pivota'lly carriedf as by the pin 65 a pawl B6 urged in any suitable way, as

by its own weight, into coacting relation "to the whose hub (58 has a bearing coaxial with the bearing of hub 64 of lever 'Mjan'd this'loearing is conveniently and "preferably formed i in'the "lefthandportion ofthe shoulder fif -(Figures l' and '2)""of the structure 39 -40.

A -bracket l0 secured adjacent 13119 1138,! end of the base 25 carries a horizontal pin H (Figures 2113 'and '4) which forms a horizontahpivot for one arm *TZ of a "V' -shaped lever 12 see Figure l.) at-"whose ap'exis mounted a roller 73which is thereby positioned underneath the rod 61; and whose other arm IW'extrnds-downwardly through asuitable aperture in the base 25 and has mounted transversely of and-below the base '25 from which extend downwardly suitable m'eans'such'as an arm 18 andon'e of the legs 26 suitably :bored or providedwithbearingsfor the shaft TI." i

I By means of the rotating cam15, the"lever"l2 is actuated in'clockwise' direction about its pivot pin 11 (as viewed in Figure-1) and given a return I stroke? once for "each 'revolutionF-of' the oath 25 6 andat a suitable "point-inits rotation: cam fol lower l a "being held in coacti'on with the-earn 15 in any suitable wayas','ior example; by the weight of the lever name the weight of" therod 61- and the lever arms 54 and fid which tend to swing fdownwardlyornin counter-clockwise-"direction; as

viewed in Figure 3.' v

. Accordingly, upon'theupward swing or-"stroke of lever 12"(Fiigure 4) roller '13 movesu zn'marr'lly and; being-fin engagement witnth'e rod amne- 75 sp'ective *of the position" of the structures-3M0 r on its*endarollrpr cam'follower "14 -for coaction with'acarn-IEJ- Cam*15'?is mountedupon when '11 extending lengthwise of the guide shaft 36, moves the latter upwardly and thus moves the pawl 66 in counterclockwise direction to rotate the ratchet wheel BI and hence the structure 39-+40 by an-amountv equal to the distance between two teeth of the I ratchet wheel 6|, the angle of movement corresponding to the angle desired to be subtended by two successive pins in the ultimate picker roll and ,henceby two successive holes H to be drilled in a row of holes in the sleeve 20,.the holding'pawl fiil yielding toward the right as this rotarymovement commences andibeing in effect cammediout of the space between two, teeth but being entered into the next succeeding space under the bias of spring'53, thus not only to hold the structure 39-40 in its new position,but also, by bottoming in the succeeding space, accurately fixing the step of rotary movement to the above-mentioned angle. 7

And as that rotary movement takes. place, the I coaction between the threaded part 40 and the block 41' (Figure 1) effects a movement-of trans-- lation of the structure 39-40 along its guiding support 36, and with the actuating pawl moving in the direction above described and with the threads on part 40 being as shown in'Figure; 1,

thatstep of rotary movement is' accompanied by the completion of the above-mentioned step of conjoint rotary and axial movement of the structure 39-40 brings a blank space or portion of the sleeve 20 into juxtaposition to the locus of operation of the drill 46 and brings an already drilled V endfirst, into the plunger recess 81, slot I3I in hole into alignment with the plunger to have a pin pressed or forced into the hole, there being a 180 arcuate extent of drilled holesbetween the 7 point of operation of the plunger45 and the point of operation of the drill 46 becausethese two elements happen to be spaced 180 apart as above noted. r

7 With the halting of the sleeve 20 in this new position, the drill 46 having been held in withdrawn position'duringthe movement asis later; described, is now moved downward "as seen in 7 Figures 1 and 5 at a suitable-cutting feed rate to drill a'hole in the blank space of the sleeve 20,

and as shown in Figure 1 the downward movement of the drill is preferably to an extent to pierce the'relatively thin wall of thesleeve 20, the protruding end of the drill being'accommodated in the underlying helical groove 39*, and which is of, ample width and depth for that purpose. During the drilling operation,thegwall of the sleeve 20 is well supported against the pressure of the drill,'by the helical mandrel faces 39 to either 82, pivotally mounted-on pins as and s4 and biased toward the plunger andhence towardeach other in any suitableway, as by their own weight,

pins 83 and 84 being carried in spaced ears formed in the upper portion of a boss 85 preferably formedintegrally with the base 25 and boredor drilled as at 86 to form an accurate guide for the cylindrical plunge 45 to guide its axis preferably in a line at right angles to, and. intersecting,

the .axis of themandrel 39 and hence of the sleeve 20.:

' The just-mentioned supply magazine; and co- 7 acting mechanism are, fully described in my above-mentioned parent application and,-hence,

(only so much thereof will be briefly described herein as will aid in more readilyunderstanding how certain controls of; the drilling operations and mechanisms maybe interrelated to certain controls of the pin-feeding and setting mechanisms, The magazine 83 (Figures 1 and 5) com prises a cylindrical wal1'98 secured to a base plate 90 that is inclined, beingan extension of; the bracket I0, and having extending therethrough a shaft 9|. at theupper end ofwhich is secured, by nut 94, a conical hub 93 at the lower endof which is secured a circular plate 96, peripherally slotted as at I00, in the shape of the pins P. Upon rotation of plate 96, pins aresupplied, pointed ends first, to the upper end of a channel I2! (Figure'10) which underlies tangentially the rotary path of movement of the slots 100. Channel I27 iscontinued in the form of a groove in an inclined member I26, preferably covered over by a strip-like plate I28 (Figure 6) throughout its lower extent, to guide pins individually, pointed throat element 8I and the curved face82 of throat element 82 coacting, when in thepositions shown in'Figure 6, to guide the pin into the recess 81.7 Upward stroke of plunger 45 swings elementl8l counterclockwise out of its path-andswings member 82 clockwise,- theunder partof away, as at I32, fo that member I26 being cut purposa' g Shaft 9| (Figure 5) has auniversal joint connection II I with a shaft I09 carried in a bearing bracket IIO, a gear'IflB on a shaft I09 being 7 V a driven by a'mating gear I61 carriedby an auxilside of the helical groove39 as seen' in Figure 1, the downward pressure upon the mandrel .39

,being opposed by'th'e upward pressure thereon exerted by the plunger 45' which, during'the drilling stroke of the drill is moving upwardly as'viewed in Figure 1 ,to force-fit a pin into a hole in the sleeve 20. T V

Plunger 45; at the conclusion of the abovedescribed'rotary and axial movements of mandrel 39r40, is in lowermost position, a position better shown in Figure 6. Plunger i5 actuates separable throat elements which in Figures 5 and 6;a.re showngas comprising two members BI and iary shaft I04 supported underneath frame 25 in bearing bosses I05, I06 (Figure 5). Shaft I04 isv driven from main drive shaft, H, as by sprockets II2and H3 and a chain II4. 0n shaft I04 are cams II6.and II'I- (Figures 3 and 5), with which coact'cam follower rods H8 and I I9, respectively,- floeing guided in verticalholes or guideways I20 T and ,I2Iin the base 25 (Figure 11) and holes I22 and I23 in'a block I24 that is secured to thepinguideway member I26 (Figure 5). Follower'rods I I8 and IIS -act'uate gates I35and .I36 (Figure 12) that are positionable transversely of the ,pin slot 121,. member I26 being appropriately slottedfor that purpose.

Gates I35 and I36 have arms I35 and I36 secured to shafts HI and I42, respectively, mounted in a bearing block I43 carried by channel member I26, shafts MI and I42 having secured thereto lever arms I45 and I46 which overlie and are engaged by thecam follower rods I I9 and H8, respectively, Cams. H6 and II! effect such successive lifting of gates I35 and 136 as to release pinsP one by on for sliding down the inclined channel I 21 for engagement with the plunger 45 (Figure 6) V V a a Downward, stroke of the drill isfpreferably achieved by e P 91 1 m n d i e h f -l "(Figures 1,..3;14,and.5) shaped'as is betterlshown in FigureilL and coacting with az'oam follower-er roller .'I 18=rotatably supported by: a'ppin .180: in; a lever I8I,:-.the left-handaend-ofswhichis pivotally supported abyr a shaft or pin: I 52 carrieiby twosspaced' bosses -I 53;;and I projecting; downwardlyirfrom. the: base 25.; and theyrighti-hand, end of which ..(Figure; 1) extends topa. point .where: lit underlies-.apush-rod I82 that extendsz vertically a suitable vertically extending boss' I183; .torguide andaaid' in supporting. thepush-rod I82.

The, upper} end of push-rod 182515 threadedirrto 'the'lower. end of abifurcatedmember |'84,"110Ck6d as by a I locklnut I 05,. member I 84; carrying apin I 86 by: which; a pivotal connection isefieoted with an arm I81 securedrto ashaft zlfl8;rotatablya sup ported in horizontal bearings: I90 (Figures; 1 :and 5). formednin thewvertical drill-spindle iguide frame :I 9|, the latter beingsecured: as: by. screws I92 tothe upper .end of a standard 193 which rests upon the bed r, base: 25-which is; secured; aseby screws I94.

b Theframe I 9| is: sleeve-like =or;.elongatedziin formi'and supports therein non-rotatablyr but vertically slidable a sleeve like spindle a. support I 95 providedain. any. suitable way: with, suitable combined radial and thrust bearing, one OfzWhiCh is indicated-at I96: for. rotatably. supporting, the

shaft or spindle. :I9I so that .the latter mayfreely rotate but mustzpartake of up. and down movement with the spindle support I95.

. At itslower-end, itheishaft I9'Iyis provided with .a suitable chuck I98 to receive the drill 46;and at itsupper end theshaft I91 hasasplined connec- 1 ,tion (not shown). with apulley 200 by .whichiit is ,dri-venat a suitable drilling speed, abelt k extending from pulley 200 to. a pulley.202.mounted on theshaft of a motor: 203 secured totheupper end of the upright standard I 93.

Intermediate. of ,the bearings I98 .(Eigure, 5) .the spindle supporting frame I90 is cut away to expose the teeth formed'in the spindle support I95, thusto forma rackUZM and meshingwith .the rack 204. are the teethofaseotion-al, gear. 205 rigidlysecured. to the-shaft I88. and accommodatedbetween theispacedw bearings I90.

,On shaft 1'! is a cam I 41. (Figures 1,,3,.and.,4) coacting-vwith acam roller 8 carried ,b pin I ,in the bifurcations I5I and I'5I .-o i--lever I5,I the. left-hand end. of which I 5 I? (Figure 1) js-pivotally supported by. the shaft or. pin. I52. Levenparts I5! and I5I 'extendeto either'side of theeboss 85 (Figure. 5) and have; pivotally secured. .to ,.them, as by. pins I sand VI 56,. links I51 and; I58, respectively, which at their lower ends pivotally engage, .as by fpinsroretrunnions IBI and IE2, a plunger-carrier I53havingavertical bore I54. in which is received thelower ,end of. the plunger 45, the vertical positionof which .maybe adjustedby screw I61 (Figure 5), locked wby nut I68. and. where thepins P arethreaded, as in FigureB, plunger 45maypartake of rotary movement with. the pin, and for thispurposel .interpose a, steelbal1 I65. between thelower end of plunger 45 and the screw I61. B settingscrew I61 the plunger45 may be .settoforce the. pins .home into, the holesalways to the samedepth, preferably not beyond the inner face of the sleeve 20 so asnot tointerfere With-slipping the. sleeve element off the supporting mandrel.

. As isbetter shown, in,1'!igure,1,.cam. I'lLis shapedisubstantially similar.v to ctherpll nger. controlling cam M1. and is substantiallyjalignedwith the latter. solthat, the riseand fall ofboth lever arms 15 anon 8k takeplacessubstantial yirrsy chronism: 0r;,1mi5011. i'llhempw rdeswine: of dever .I 8 I: raises the nushrodv ,IBZand through the e ring 205-204 the drill spindle and drill 46 :are lowered; to; an? ;extent,==.. and at; a.:drilling-:ratei to eause;the,;drill=to drillzauhole in :the sleeve; 2 0;.the

' penetratingendof; the: drill, being accommodated in; .a:.=.he1i.ca1 roove downward SW ngQQ th lever :18 I reverses;thrnmovement rzthe-drill being withdrawn; and in this, connection any suitable means; such asithe weightlof th lever-1 3| ayb used. -to;-ca;use ;the. lever -:faithf ully .to follow the cam; II'I; Milli-511Gb meanstasithewjeight of; the Push: rodrimz and connected z partsi; may serive to keepmthe push rodrwith the endof lever I8I, and --cau se Tit; ,iaithiully. ,tO'IfQHOW also the downstroke of. thei-lever I0 I y. 3118;.1205'01'16; substantial; synchronization :of the ,oleyers -I5I and I-81, the plun er- 45; .movesopt-as; th -mi ovesyzdown. and :vicewersa; theipressure;eifectsof the two up n the s v wandits.mandrelsupportbein substantially counterbalanced i --With the. 'mandrelcand,the sleeve Q20, rotated step by step and l axially advan ed .in. the. direcitions. indicatedmndi-with the advanc e;;displace- ,qDuring the upward: stroke; Q of plun er 4'5,- the Y .drill. 46 ;isj.- gievenyatsteady downward strok e,-=,and

-;the,.:mandrel; 39;. andshenceisleeve 20; are, held in fixed position with; apreviously drilled. hole of: that particular helixr row presented Etoand .flxedlyivheldnini line with. the upwaldly .Qmoving pin: .carried-bythe plunger the. drill meanwhile commencing .J'he w...clril1ing operation ;to provide a "hole moi-in; advance; and. as the plunger-recedes and hence moves. downward y, a a a resul movement; o: cam I 41; .inreounterclockwise direction ,fromthe. position. shown inEigure 1,. it being noted, thatthe .weightroL-the plunger. 45 carrier I63 'and leverz -I 5 I. insure. biasing, of; the. cam .follower. always -i nto engagement with the cam .I A],

.cam I IE :Figuresl 1. and- 5) continues .tohold gate tl 36, closed,..the roam, follower .I-Iflthereot being still on a low part of the cam -whilenc-amlIII'I,

having. .opened.,.the. gate: I 35 .(Figure i 5).; shortly after cam. .LIO-hasclosedthe gate I36, such closure having ,takerrplaceehortly after. release of .a; single pinwhilert-hel plungen 45 is :inlits lower bmost posit omnow movesthe gate I35 in closing position; thus to hold back the, row. 0t pins P in .the channelrllfl I to the ri'ghtofrthel gate 1 s s, .'a.na thus preparing; for. the, release by. gate I36. of ,thesinglepin ,heldlbynthe latter, in advance .or

. to, the left. of gate 135;

, allowin .thewithdmwaiewmetime arm stroke. followed .by..-a retrograde. stroke (see. the

.hump. in .cam.15,of Figure: 1 I displaced about fromtheihighestpoint. of .cam .I 41) ,jthus. to actuate the .ratchetiifitq rotate {the mandrel 4391-..40 throughout the; angle. subtended by two successive .holes H.in a rr wran'd by the .coactionbetweenlthe lthread'ed bldlifl andj-thethreafis Of, part. 40] to advance the mandrel slidably along its support 36 by'th right amount, locking pawl 60 acting to locktherotated parts accurately in their new position. Y l

By that time the lowestportion of cam I11 holds the drillin uppermost position and the lowest portion of cam I41, that portion being of about 90 extent and of about the same radius throughout, comes into coaction with the cam follower I48, thus to hold'the plunger in its lowermost position as shown in Figure 6,'With the throat forming elements. 8IIl2 restored to coacting relation with the pin receiving socket 81 in the plunger, and just about when the plunger arrives at its lowermost position, a high portion of cam 'I I6 rides the cam followerIIIl upwardly to lift the gate I36, thus releasing the single pin thathad been isolated between the two gates I35 and I36, that pin quickly movingdown the channel extension 121 to be entered into the plunger recess 81 as was above described. e r t Then the gradually rising portion in the upper I left-hand quadrant, as viewed in Fi ure 1, of cam I41, comesinto action upon camroller I48, progressivelyand steadily forcing the plunger to the uppermost extreme of its upward stroke to seat and embed the pin carried by it in the sleeve 20, but just about when that movement begins or shortly thereafter, cam IIB closes'the gate I36 and shortly after such closure cam "-1 opens gate:I35 to permitthe ,row of pins in channel "IIlI to slide downwardly to be'stopped by closed gate I36, and shortly thereafter cam II1 closes gate I35 in order thus to place the single pin between it and'gate I36 under the sole control of gate I36. .A similar gradually rising portion of the cam I11 operates substantially synchronously to steadily bring the drill 46 downwardly to perform its drilling operation.

Such sequences of steps to constitute a complete cycle thus take place during a single revolution of main drive shaft 11 and of cam shaft 104, the ratio of driving connection between the two being 1 to 1, whence the'cycle repeats itself in rapid succession, illustratively at a rate to drill holes for and anchor about 60 pins per minute.

,The main drive shaft may be driVen in any suitable manner, conveniently by way of an electric motor In which may be secured to the underside of base 25. as indicated at I12 in Figurefl, whence a drive chain I13 connects the motor sprocket I14 with a sprocket I15 mounted on the rear end of shaft 11.

Where the, holes H in the sleeve member 20 are to be arranged helically, the operation, after having assembled a blank sleeve to the mandrel 39, is commenced by first manually setting the structure 3940 toward the left of the position shownin Figure, 1, the drive being halted for that purpose and the thread block 41 being withdrawn from engagement with. the threads of part 40 so as to permit'man-ual sliding of the structure along the drive a the gateJI36,and do this preferably vby displacing the cam follower'or push rod H8 out of engagement with the gate'lever I46;.as'-:is better shown in' Figure "11, where the aperture 7 I20 inthe base 25 and the aperturell22in the sufilciently to the left of the. free end of lever l46 so as to clear the latter during its upand'down strokes of movement,'the under end portion of lever I46 being tapered or cam-shaped to insure re-entry of the upper end of push rod I'I8 underneath the lever I46 when the driving connection is to be restored, as is later described.

About an intermediate portion of push rod I 18' is an elongated sleeve 208 pivotally mountedby pin 209 at the lower end of a lever. ZIII that is pivotally supported by a screw stud 2| I threaded into a suitable boss in the downwardly inclined channel member I26; the upper end of lever ZIII 1S shaped as at 2I2'to provide a cam follower for coaction with a peripheral cam 2 I 3. This cam' also controls the hole-drilling operation;

Lever 2 I I} is biased in counterclockwise direction as viewed in Figure 11 by a spring 2I4 (see also Figures 10 and 12) one end of which is connected to the pivot pin 209 and the other endof which is anchored to a frame part such as the upright I93, as by pin 2I5. If unrestrained, the tension of-spring 2I4 swings lever 2H] counterclockwise sufficiently to tilt the push rod H8 in clockwise direction (Figure 11) to bring its upper end underneath the gate lever I46, a pin 2I6 projecting from the block I24 being engaged by 9. lug 2H1 projecting from lever ZIEI in order to limit the the supporting shaft .36 and to permit positioning the mandrel structure in a rotary sense, locking pawl 60 being yieldably mounted while driving pawl 66 may be disengagedif necessary, to bring that portion of the sleeve 20 where the first hole definitely; fixed by the inter-engagement of the thread block4 1 with the threads'of. part 40.

Preferably, in order to forestall pin-setting action by the plunger until afsuitable number of holes'have' been arme bythe drill, 1 interrupt extent of clockwise tilting of push rod II8 to just about its normal or vertical operating-position.

Cam 2I3 is rotatable and movable with the mandrel structure 39 -49 and is preferably mounted for adjustment with respect thereto. Preferably, as is better shown in Figures 1, 2, l0 and 11, I utilize collar 42 as a carrier for cam 2I3 and I may and preferably do, form the cam .2I3 integralwith the collar 42, and where a fixed relationship of the row or rows of holes'in the sleeve'member 20 is desired with respect to the fixed cut-outs 2!) (Figure 1) with which the annular shoulder 4I interfits as above described,-'I

preferably provide suitable ineans for fixedly relating the cam 2I3, in a relative rotary sense, to the mandrel structure, and this I'may achieve as by a slot 39 in the end portion of themandrel 39, and where the holes are to be drilled and the .pins set in the, pattern of a multiple helix, such radially extending key or projection 2I3 (Figures 10 and 11 set into a suitable recess in the 'end face of the collar-cam structure 42-2I3' and fixedly secured as by a screw 2I1, and with the four slots equi-angularly spaced, set screw 43 and the key 2I3 are spaced apart as shown in Figures 11 and 13. The slots are open-ended (Figure 10), and by loosening set screw 43, the

structure may be slipped onto the mandrel in an axial direction in anyone of four rotary positions, each related to one of the above-mentioned desired helical rowsv Ofjholes' and pins.

In Figures "9,19 and 11,- the parts are shown swarm positioned tin steadiness ito drill 'vthe ifirst hole of, ficrsexample, row :Rlj, sleeve 20 having "its :cut-out 20! (Figure 19]) iinterfitted with the :stepped shoulder lll of the mandrel and key 12.13" being in the slot 39 with .set :screw 43 iti'ghtened :up against the bottom .Df slot 39, and in that position the high peripheral portion fi2il3 ..of :theicam (the part rotating in reountercloclswise :direction, as seen in Figure 1'1?) has sits initial portion thus brought into engagement with the lever 2") which is thereby :held swung :clockwise against the tension of'sspciing 2 HI, ithus holding .push rod '1 l8 out of engagement with the gate lever M6 so that the ensuing up and :down :strokes :of the push rod under (the action sof :cam 1116 :do znot actuate the gate .335. 'fllhesstep bycstep drilling commences, upon starting the apparatus, and continues, the gate remaining closed until the drill .has drilled enough holes corresponding-zto the displacement, in the illustrative embodiment 218.09, between lth'e locus {of operation of the :drill and the locus of operation of theapinesetting plunger 35, 1'01 in other wordspuntil the first holedrilled byathe drill 46 :is in position to have the :plunger 45 $613 (a :pin iintozit; accordingly, the thigh peripheral :portion $1153 101 the cam .213 is of that arouaize extent,-:namely 1 80, whence there isa drop to the portion 22 3 o'f the cam, that 1 change in the cam periphery permitting ilever .Zl fl to swing in counterclockwise direction under the tension of spring 1211!, thus Lrestoring push *rod M8 to its position underneath the ga'te lever 146 whence the gate 4236 is actuated, being timed :as earlier above described with the other :moving 'parts, to transfer :a pin 'to the throat elements and to the plunger :45 for insertion into that first .hole, whence --step-'Joy-step drilling, :stepby-step pin transfier, :and .stepby step pin-setting continue in timed relationships, as earlier above described.

.As earlier above meted, the step-by-step movement of the supporting structure, :such as .the mandrel structure 39'4'0, f0rthe sleeve 20,"is a step 'by-Jstep :rotary movement .in the direction of the arrows-shown on the drawings and .a step-- by-istep movement :in a direction toward the right asvieweduin Figures 1, 10, 11 and 12, where the pattern in which the .JhOlES :are drilled and pins are-set is helical. At the .connnencement .of the operation, that is, when the :first hole :is drilled, the mandrel :structure and the :sleeve are in their deft-most position, as :shown in Figures ;9 and 1'0, and the extent in anaxial direction of the cam follower 212 -of the lever 2141 or the axial extent :of the portion 213 of the cam .213, or both, is -so proportioned that, with the :cam i213 moving with the mandrel :structure, the cam 2l3 becomes displaced to the right of the cam follower 212, as viewed in Figure 10, shortly after the :cam follower 2112 has :been tripped inwardly toward the :axis :at the relatively sharp 1step 213 (Figure 1 1 thereby, :as the cam icontinues its s'tep-by-step rotary movement and zstepeby-step movement toward the rightKFigure '10) to avoid interference with :the pin-transferring and pinsetting mechanisms during their required subsequent operations. Though the cam follower 212 is' in this :manner disengaged :from the lower 20am poa' tion 213 :spring .2 I 4 continues to hold the push rod-hi8 in operative relation to the gate lever 1'46, lever 'lug 2 m :and pin 2H5 acting K1111;- ing this interim to fix the just-stated position orpush rod 'lil'8 underthe action of spring 21-4.

is the drilling and pin-anchoring :operations continue, the :pdintzi-s reached where the last hole of helix-of hcles is :to be drilled, zandeat that point :I provide suitable :means .iior nrrther'rdrilling operations rby the the rest of the mechanism to continue so as iizo omclude the setting :of pins-in the 118i? extent oi 'lhdl'es that :would at that point xemainriin advance iofv'the .lncus zofioperatinn hi the A zprefierred way ifior reflecting :such messatilm hi the drilling operation :in advance :-(by 181)) of stopping the pin-setting operation, the latter theing accomplished ,prefenablybyzstopping the drive of the @entire apparatus, icompriises rprovisions rim interruptingthe {working StI DkESI'Df the-drill; 10011- venienfily'byislnftmg .fthe push rod (-82 -i(Eigm'e 1 at its dower tend, to the :right "and thus idisengaging lever l'llzl. 'illm's'thelboss ifleaml the base .25 have a longitudinally extending :slot 248 :so :that :the lower end of the push rod may be amoved to Lthe right :in fil ligure El i'aboutzthe aplvnt pin :IBS at its upperwconneo'tinn, {as aipivot',-;a:nd such zmovement, :amd subsequent restoration into coasting relation with the FlBVBI A181 may he achieved as zbysafyoke 21:9 %(Figuresi9, d0 and.;l2 suitably mounted above the upper face of the base 25.

:the 'yoke 2d 5, rhetween-the'arms of which and the :fixed boss ,2 21! is :a (coil :spring 123 which normally biases the yoke 2 l 9 in a direction toward theiright .as viewed in Eliigures 12 and 13.

, :Asis betterzshowniin Figures 9 and 13,1 provide 1a arm 42:24 :for coaction 'with :the collar 222, llatchi'arm 224 being pivetally supported "by a pm .225 mounted :in a bracket 2.26 secured :as bysscrews 221;tc:the frame upright :l 93.

With the push rod 182 in'engagement with-the lever $81,, and preferably the latter is provided withnrecess 1581 tFigu-re 9) and the lower end of push .rod 11582 may be shaped as shown to betmeriseatdtself in the recess I81 the slide ,rod 22.0,:of :the yoke 2:1-9 held in a leftward position, as in Figure 19,, with the spring 223 compressed, [by swinging the .latch lever 22-4 in position to the right of the'collar 222 to an *extent permitted by the :free end portion of the rod 2220, as is loetter shown in Figure 13,; thereby yoke 2:119 .is held in :position to maintainthe lower end of push d 1182 in alignment with the :recess 1-8:! ,zofwth'e :lever I 31, the push rod L82 partaking of upnnd 'downsstrokes in response to the actuation ofllever I81 .from the cam all! whose lowest portion, that is, the portion :of smallest radius, isipreferably such that it permits the free end :of the lever I8l to assume a lowermost positionto unseat the :push .rod 182 from the seat. r851 though re-iseating .takesiplace upon each :upst-roke of the "lever 1581 so .long the yoke H9 is held in the above-:mentioned position :as shown in EigurelQ.

"In positioning the latch lever 224 as above described "(see Figure 413)., a laterally projecting A portion 1.24 of the latch lever 22 is :given :a position substantially like that shown in Figure 13, being substantially in the helical path of :movement :of :a projecting portion 2l3 of the cam 513, related :to the other portions substam tieilly asshownin-Figure .13.

. :As :the above-mentioned cycles of drilling, pintransferring and pin-settingare repeated, :and as the drill l6 approaches the ,point in the listen-hystep rotary and axial movement of the mandrel tion to the cam'follower portion 224*- of the latch lever 224, the last" hole is drilled, whence the next. step of'rotary movement of the mandrel structure and henceof the cam 213, beingin counterclockwise direction as viewed in'Figure 1.3, causesthe campa'rt 213 to engage the latch lever part 224 and trip or swing the latch lever 224 in clockwise direction and hence'out of engagement with the collar 222, thus releasing spring 223 to move the yoke '2l9 toward the right as viewed in Figure 9 and from the position shown in Figure 10 to the position shown in Figure 12; this action occurs during those portionsof a cycle that find the lever |8l (Figure 9). in' lowermost position in which the lower end 7 of push'rod :82 is out of engagement with the seat 481 of the lever, thus giving the spring 223 complete freedom to swing the push rod 182 to the right and into the dottedline position shown in Figure 9, the subsequent upstrokes of the lever l8l being thereby ineffective to give the push. rod I82 and hence the drill any working strokes' The drilling operations are halted and the drill remains in uppermost or out-'of-the-way position, whence the setting of pins in the still empty holes (of about 180 extent) continues, the drive of the apparatusbeing stopped when the last pin is set. a a

If the sleeve member 20 is to have more than one helix of pins, as was above initially assumed, the general sequence of steps above described is repeated, once for each additional helix, butonly after disengaging the thread block 41 from the thread part 13 to axially and rotatably' reset the mandrel and the sleeve 20 to the starting point 'for the second helix of holes,and then re-enga paratus is: started, it continues to function with-- out attention until the last pin is set'whence-it is stopped as it hasto be in. order to reset the cam 213, or to replace the sleeve member 20 by elements can be achieved. j l V 'I'o remove the sleeve member, collar 42 of .the

mandrel 39 is released and the supporting stand-i end'portion (Figural) with the annular stepped shoulder 41, 1 v 7 Thus it will be seen that there has been provided in this invention an apparatus in' which the several objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved.

As many possible embodiments maybe made of the above invention and as many changes drawings is to be interpreted as illustrative and a pitch of said helical recesses, means for selectivelyv in the thread block, and resetting the rotary position of cam H3 and its'carrier collar 42 by bringing the key 2l3 into one of the mandrel slot corresponding to the next helix and then setting the lock screw 43, as'above described, but now with respect to the second helix to be drilled and pin-set.

Thus, if there are'four helixes of holes to be drilled and fitted with pins, the four helixes start at e'qui-angularly spaced points and hence at'points spaced 90 from each other, and accordingly' the mandrel part 39 has the above-mentioned four slots 35, 39 39 and 39 similarly spaced equi-angularly and hence by 90, and thereby the cam structure 42-213 can be set in four difierent angular'relationships, one for each helix. a

Each such setting of the cam structure insures that, for each helical row, drilling commences at the right point, pin-setting is delayed until the space 'diiferential between the locus ofv operation of the drill and locus of operation of,

time once set for 'a'particular helix, and theiap not in a limitingsense, L

I claim: l

1. An apparatus for drillin 'holes through the ,wall of a, hollow cylindrical support, said apparatus comprisingjdrill means, a mandrel for supporting said hollow cylindrical support, said .mandrel having a, pluralityv of helically extending recesses therein to provide spaces for the emerging end of a drill of said drill means drilling a hole through the wall of said cylindrical support,

means mounting said mandrel and said drill.

means to efiect relative step by step movement therebetween along the line of a helix having the determining along the line of which of said plurality of helical recesses said relative step by step erating for any selected helical line determined by said last-mentioned means and operable dur--' 'ing pauses inlsaid movement to effect relative movement in a general radial direction. between said mandrel and said drill means to effect drills. ingof a hole through said wall whereby the emerging drill end is always accommodated'in the selected helically extendingrecess.

27 An apparatus for drilling holes through the a wall of a hollow cylindrical support, said apparatus. comprising drill means, a, mandrel for supporting saidhollow cylindrical support, said mandrel having a plurality of helically extending recesses therein to provide spaces for the emerging end of a drill of said drill means drillingav hole through the wall of said cylindrical support, means mounting said mandrel and said drill means toeffect relativestep by step movement therebetween along the line of a helix having the pitch of said helical recesses, means for selectively determining along the line of which of said plurality of helical recesses said relative step by step movement is to take place, mechanism operable during pauses in said movement to effect relative movement in a general radial direction, between said mandrel and said drill meansto efiectv drillin of a hole through said wall whereby theiemerging drill and is always accommodated in the selected helically extending recess,

said mechanism. including means. for ha ting assassin drillingractuationonsaid drillimeansyand; means operating/Tieranyrselecteiilhelicaldine determined by :saidselectively determining :means and :responsive' to a succession of 'stepsxdf :said step by step movement-lion actuating saidlhaltingrmeans.

"J3. apparatuses-claimed 111 0131111 2,Jill wl'ilch said last-mentioned responsive-means comprises said mechanism comprises a. member having strokes cirmovement the cycles:orwhichzare'itimed with said pauses in said step by step movement, a control memberfhavlngi'means m'ounting it "for movementintc or ent ofoperativerelationzto said last=mentioned member to effect or discontinue wall of a hollow cylindrical. support", said. appa ratus comprising a "mandrel 'to receive rsaid cylindrioal support thereon, said mandrel beingfrecessedi to provide. space v :for' accommodating: the emerging end of' a drill drilling through thew-all or said support :and thereby leavingisinterveningi surface ortions'rofthe mandrel. to. give internal support to :said hollow 'cy lindrieal support, drill' means; meansmountingts'aid drill means and said mandre-litor relative: stepb'y :step movement alongthe line 'of the 're'cessingiiin' said: mandrel,- means operating during pausestinrsald"stepbystep 'niovemerit, to actuate sa'id drill means to drill'ahole: at each pause throug-h. the wall of said hollow support, thenemergingend oithe drill means beingthereby always accommodated-lathe:re'cessing inf saidv mandrel.

'8. An apparatus ftordnlli-ng holes through the wall of :a hollow cylindrical support, said apparaltus comprising-1a mandrel forxsupportlng said hollow cylindrical support; there being rib means associated with said mandrel "to-provide internal support: for the: walls of. said hollow cylindrical support ancl to provide rspaces relative to said hollow siilipb rtifor the accomrnod ation therein of t e emerging end of the drill" drilling ahole through; the wall or: said; support; drill means; means mountingz said mandrel: and: said d ll meansifor relative-step b stepniovement along the line of the-spaces p'rovidedby saidriio means, andrmeans :to'rf actuating said d-r ill means to dril-l a hole through the wall of said support as' haclk etl up by 'saidriome'ansduring a pause in said relative movement, the emerging end of the drill being thereby always accommodated in said spaces.

9. An apparatus for drilling a helical row of holes through the wall: of a f hollow cylindrical suppornssaid apparatus comprising a imandrel for: supporting andinternally backing up said hollow cylindrical support, sa-id'iinandrel :hav ing' a helical 5 groove therein tozprovideza :space for accommodating theemergingend-of a drill drillingthrough the Wall of said "support,- drill means, means mountingv said. mandrel and said dri-ll means for relative step by step movement along the :lineof said: helical groove, andflme'ans operableduring pauses in said movement for actuating said' clrill means to drill holes through said wall, whereby the 'emergingend'of the-,drillzis always accommo dated in said groove.

l0; apparatus tor drilling holes through the' Wall of a hollow cylindrical .s'uli'port, 'sal-id ap"p'aratus comprising :a mandrel for receiving said support thereover, rsaid .inandrel having -:a plurla'l-' ity of helical grooves thereinfto'zprovide spaoesforthe' 'emergin'gend or a'xdrill and: 'to leave finterveilingrib'elementsto support said support, drill means, 'meansffor effecting step by step relative movement between "said mandrel and said dn l'l means along a helical lirre of the same pitch as said lielixes; means for selectively effecting such relative step-bystep movement along the line or any one of said helical grooves, and 'means for actuating said drill means and operable duringpauses 'in said step by step inovernent to dri'll a hole through said wail ateach :pause whereby the emerging end or: said drill is always accommo dated in one-of said-helical grooves.

11. Anrappaiiatus for drilling holes in a eylmdrical'support; said-apparatus comprisingrnearis for supporting said cylindrical support, drill means,- means ior' effecting step by step rotary movement of said supporting means relative to said 'drill means, means operable during pauses in said vmovementcto "actuate'said drill means in a general radial direction'to drill ahole in said cylindrical support,:cam'tmeans partaking otsaid I and then-away from said cylindrical suppor t to I relation tosai rotarymovement relative tosaiddri'll'means, and 7 means controlled by said 'cam"means-tcrprevent operation of, said last-tmentioned means and thereby prevent drilling by said :driill means.

1 2. apparatus for 'drillin giho'les' in 'a cylirrdrical support, said apparatus comprising means for supporting said" cylindrical support, drill means, means" for effecting step by step rotary movement of saidr'supporltlng means relativeto: said drill-n'rieans,- means operable duringpauses' in saidmovement toactuatesaid 'drill' means'in. a general radial direction to drill :a hole in said cylindrical support, said last=mntioned meansincluding a disconnectible operating connection, and means responsive to said rotary movement for effecting: disconnection ers'ai'd operating: connection.

.13. An apparatus 'for drilling holes in a cylindrical :support,.'said i-appai-atus compr isingmcans for: supporting said cylindrical support, d 'llf means, meansztor effecting :step' by step r ot movement of said supporting means relative said drill means, mechanism operating in timed tep bystep'inovem'ent foreifedta-rcyc'le of movements-of said drill mean in a general radial direction-toward thereby drill a "succession of holes therein, said mechanism including adiscohriectible operating connection havingmanualimeans for :controiling it i ed a "oiiiatically upon the:completiomofidrillineof a su'ccession or: holes to effect disconnection thereof. 7

14. An apparatus for drilling holes in a cylindrical support, said apparatus comprising means effect drilling of a -row of holes.

for supporting said cylindrical support, drill means, means mounting'said supporting means efiects axial movement-thereof, a ratchet wheel and a pawl'for' giving said carrier means step by step rotary movement, means carried by and mov-.

I ableaxially with said carrier means for'supporting and actuating said pawl relative to said ratchet wheel and having an elongated member extending lengthwise of said carrier means and movable axially therewith, and a relatively fixedly positioned actuated member relative to which said in relation to said relative rotary and axial movements, a member partaking of the latter movements and thereby brought into operative relation to said control member, and means responsive to actuation of said control member for halting the said relative radial movement.

15. 'An apparatus for'drilling holes in multiple helical rows ina cylindrical support, said apparatus comprising drill means, means for support- I ing said cylindrical support for rotary movement about its axis and for movement in the direction I .j of its axis, all relative to said drill means, mecha nism for effecting'step by step rotary movement of said supporting means, means operable during pauses in said step' by'step rotary movement to effect'relative movement in a general radial direction between said supporting means and said drill means, and means for effecting axial move ment of said supporting means comprising a cylin; drical' element externally threaded in multiple threads corresponding to the multiple helical rows in which holes are to be drilledand a nut element coacting therewith, means mounting one of said elements to rotate synchronously with said supporting means whereby'relative rotary movement between said'two elements 'efiects relative axial elongated" actuating member extending length- 7 3b wise of the'direction of axial movement, mechamovementtherebetween and axial movement of i said supporting means, and means operable at will, for-selectively inter-engaging said two elements according to,.the desired'helix along which to 16. -An apparatusfor drilling holes in'multiple helical rowsin a cylindrical support, said apparatus comprising drill means, means for supporting said cylindrical support: for rotary movement about its axis and forlmovement in; the direction of its axis' mea'ns forefieoting step by'step, rotary. movement of said supporting means, means operable during apause in 'saidstep'; by step move- 7 ment to actuate said drill means to drill a hole in said cylindrical support, and selectively controlled means comprising a multiple-threaded element and an element coacting therewith, said elements having means mounting them for selective interengagement according to-any one ofseveral mul-.-"

'tiple, helixes; said elements operating in response to said step-bystep rotary movement .to effect axial movement of said supporting means to said elements, whereby said holes may be drilled in said cylindrical support in a plurality of helical ,traversesaid cylindrical support along a helix corresponding to any selected interengagement of l7.'jIn'aniapparatudhaving drill means for,

drilling'holes, the combination comprising rotatable carrier means 'for receiving and holding a cylindrical support, said carrier meanshaving an externally threaded portion and, coaxial therewith, means for'holding the cylindrical support I coaxially-therewith,-means supporting said car-;

rier means for movement axially, a relatively fixed nut element. engaging said threaded portion whereby rotary movement of said carri r means.

elongated member is traversed during axial movement of said carriermeans for-thereby communicating step by step motion to said pawl, whereby said drill means may be made-effective 1during pauses in saidstep by stepmovement to thereby drill a succession ofholes'in said cylindrical sup port with the holes aligned substantially in ahelix.

18. An. apparatus for drilling holes in a cylindrical support, said apparatus comprisingrotatable carrier means having an externally threaded portion and, coaxial therewith, means f or holding the cylindrical support coaxially therewith, means supporting said carriermeans for movement axially, arelatively fixed nut element engaging said threaded portion whereby rotary movement of said carrier means effects axial movement thereof,

mechanism carried "by, said. carrier means and axially movable-therewith for giving the'latter step by step rotary. movement andhaving an nism including a" relatively fixedly positioned V periodicallyactuating-element relative to which said; elongated actuating. member is" traversed during axial movement for'operating it throughout the extent of axial'traverse of said carrier means. Q e

19. An apparatus for drilling holes through the wall of a hollow cylindrical support that has a stepped end portion to mate with a oorrespon'd- I ingly stepped end portion of another and coaxially, arranged hollow cylindrical support, said appaparatus comprising drill means, means forsupporting said hollow cylindrical support and come prising'a mandrel onto which said cylindrical support is 'sleeved,'said mandrel having a plurality of'helically extending recesses therein to provide spaces for the emerging end of a drill of said drill means and to leave intervening surface portionsof the mandrel'fo'r backing up thecylin:

d-rical support as said drill means drills a hole through the wall of said cylindrical support,1said mandrelhaving means interengagea'ble with at least part of the stepped end portion of the cylindrical support whereby successive cylindrical supports received on the mandrel are related tosaid helically extending recesses always in-the same mannenmeans mounting said mandreland' said drill means to efiect relative step by step move ment therebetween along the line of a helix having the pitch of said helical recesses, means, for selectively determining along the line 'of which of saidfplurality of helical recesses said relative step by step movement is to take place, and mechanism operable during pauses in said movement to effect relative movement ina general radialdirection between the mandrel and the drill meansto effect drilling oi a ho'ie throughsaid wallas the latter is supported by said intervening portions of the mandrel and whereh y the emerging drill end is always accommodateddnthe selectedhelicallyextending recesses.

PAUL SCHULTZE;

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