US2460156A - Automatic drilling machine - Google Patents

Description

R. E. VANDERHIDE AUTOMATIC DRILLING MACHINE Jan. 25, 1949.

3 Sheets-Sheet 1 Filed April 4, 1945 N 9 r. m P I mmw w I I @9 N H 1 I Q @N MN 9 6Q. N

Jan. 25,. 1949. R. E. VANDERHIDE AUTOMATIC DRILLING MACHINE 3 Sheets-Sheet 2 Filed April 4, 19,45

5 Sheets-Sheet 3 Filed April 4, 1945 Liam A simple example explanatory of the foregoing Patented Jan. 25:, 1949 "UNITED srmss "PATENT 1 OFFICE 2,460,156 AUT-OMATIG FDRILIJING MACHINE Robert E. Vanderhi'de, .Kelly Field, Tex. Application April 4, 1945, Serial No. 586,' 475 -16-Claims. 1 My present invention embodies certain novel improvements in drilling machines.

In one of the preferred embodiments of my :inventicn the same is adapted particularly .for

use in conjunction with -Brown;& Sharpe automatic screw machinesof the turret type, such machines being commonly used for performing --additional operations than drilling upon the work by equippingthe turret with the appropriate tools which may perform threading, turning, tapping,. ,rknurling, .or other operations.

In the operation of :automatic screw machines ofwthe class above referred to, the [use of the drill requires that it loe ,pulled'out irom the work periodically for cleaning, as by wiping ofi the; chips or metal particles therefrom, and oiling the same. The pull-out operations 'in the turret type machine rareeffected by the customary operation of movement of the turret slide and turret under the control of the lead cam, such :movementef footing the withdrawal "of thedrill from the work during certain periods of the rotation of the lead cam. This method of withdrawal of the drill slowsdown the drilling operations materially because of therequirement to bodily'shift .the turret, .slide and the turret suificiently to pull the drill out -of the work, causing a wastage of time due to the relativelyslowmovementof the lead cam .in effecting the drill pull-out action or actions.

may be given, applicable to a job "requiring 100 seconds to complete, which job would involve a time factor or substantially 10 seconds per :piece :for the "pull-out operations by movement of the turret slide and the turret. It is obvious that; where the job involves a lot Of 5,000 pieces to be run, with the foregoing allowance of approximately 10 seconds per piece for withdrawal or pull-out action of the drill, wasted time in the aggregate of approximately 14 hours is incident to the handling of the job mentioned.

It has therefore been a primary object of my invention, -by the addition of attachment parts and controlling operating devices to :the ordinary Brown -& Sharpe automatic screw machine, to effect the pull-out actions of the drill entirely independently of the movementof the turret with the turret slide, the turret of course supporting the drill, as usual.

U. S. Patent .0]? Rich 2,039,347 in the .prior art exemplifies a known type of machine such as above referred to as an ordinary; automatic screw machine.

.By my improved attachment and operating featuresreferred to, together with .a redesigning .or the lead cam, I place the pull-out operations :of :the'drill underan operating control of mechanism which will .perform the pull-out actionor actions, as the case maybe, and the number of 'whichwill depend upon the depth of the hole to 'be drilled, substantially instantaneously or approximately in -a;.seconds time, and only involving attraction cf the movement of the turret and slide-utilized today. Therefore, -I am enabled to save a tremendous amount of time by the use of my :improvedinstrumentalities, (so far as the pullout operations are concerned, providing a great economy in production time for finishingthe drilling-operations on the work, with obvious resultant advantages.

@neof'thespecial advantages of my improvevments :lies in the fact that they may very readily I likewise incorporated for use 'in drill presses and similar machines.

A .full understanding of .my invention may be had upon reference to the fOllOWiI'lg detail description andattached drawings, 'in Which- Figure -1. is a side elevational view showing in a general manner a Brown *8: Sharpe automatic screw-machinewith my improvements adapted thereto, the view be'ing largely diagrammatic.

Figure 2 is -a plan view showingprimarily the turret slide and iturret'with the motor operated instrumentalities mounted thereon for performing the pull-out operations for the drill 51111115- trated -as carried by the turret.

Figure 3 is aside view of the turret alone, the samebroken away to bring out more clearly the mounting of thearatchet lever and ratchet wheel on the shait thatpassesthrough the turret spindley-also showing the connection of the pull-out warm :and drill holder morefully.

Figure-4--isa side elevation showing in full lines the construction of the lead-cam when designed for the purposes of my invention, dotted lines *illustrating'the ordinary iconstruction of :such a :lead cam by way of distinguishing it from my redesigned form.

Figure 5 is a transverse sectional view taken abouteon therline 55 of Figure 3.

Figure 6 :is a perspective view generally showing the turret'slide, turret, and the'operating instrumentalities illustrated in Figure 2, the drill "being :in withdrawn position asdistinguished from 2,4eo, 1 so associated pull-out instrumentalities, the cylinder supporting the drill holder being broken away to show the stop lug on the drill holder.

Figure 8 is a side view of the timing drum and micro-switch, and interacting parts.

Figure 9 is a diagrammatic view of a turret equipped with tools as may be used with my invention.

Figure is a view of a piece of work made by the turret tools of Figure 9.

Referring to the drawings, and particularly to Figure 1, it is noted that the frame of the automatic screw machine illustrated is designated 1, and on this frame is mounted in the customary manner the turret slide 2 supporting the turret 3. In this view the work is designated 4 and is supported by a suitable collet or work chuck of any conventional type designated 5. The drill 6 is mounted in the holder 1 in any customary manner and is fastened by means of the usual screw seen in dotted lines in Figure 3 and indicated 8. The drill holder 1 is carried in a tubular'drill carrier comprising the cylinder 9, and the holder 1 is adapted to slide longitudinally within said carrier 9, the latter being mounted detachably on the turret. The screw machine comprises the usual drum and cam shaft I0, see Figure 1, said shaft supporting the timing drum H, the movement of which is synchronized with the movement of the lead cam l2 by which the slide actuating lever I3 is operated. The foregoing parts are generally the conventional parts employed in a screw machine of the general type referred to as incorporating my improvements, and the improvement features of my invention will now be set forth.

On the slide 2 is supported a motor in the form of the solenoid [4, the core member l5 of which is connected pivotally with one end of a lever Hi, the opposite end of which is attached pivotally also by a universal joint member I! to a link l8. The end of the link I8 opposite that attached to the lever [B is detachably secured to the upper end of a ratchet lever 19. The lever i9 is pivotally mounted loosely on the adjacent end of a shaft which passes through the supporting spindle or shaft 2| for the turret 3. 0n the end of the shaft 20 adjacent to the lever 19 is keyed or otherwise fixed the ratchet wheel 22 and at the opposite end of the shaft 20, where said shaft terminates externally at the turret 3 there is secured the pull-out arm 23 which may be keyed or otherwise fastened to the shaft 29 to turn therewith as the shaft 20 is rotated by the action of the ratchet wheel 22. The outer portion of the arm 23 is slotted, and adjustably fixed to the arm is the pull-out rod '24, a screw and Wing nut connection being provided between one end of the rod 24 and the arm .23 so that these parts are detachable, and additionally the amount of throw of the rod 24 by movement of the arm 23 may be adjusted by varying the position of the wing nut and screw connection at 25 in relation to the slotted portion of the arm 23. The rod 24 is an adjustable rod in that it is made of a sleeve section into which the threaded section 24a may be screwed.

The pull-out rod 24 is attached at the end opposite that secured to the arm 23 to the drillholder 1, and the attachment means is somewhat peculiar in construction. Said means comprises the bell crank latch member 26 having the catch 2'1 at one end for engagin over a stop lug 28 projecting laterally from the carrier or support 9. The latch member 26 has its outer arm connected by a ball and spring joint 30 with the rod 24, and the latch member 26 is, furthermore, pivoted at 3| to the outer head 32 of a spindle 33 which is attached to the drill holder 1 by screw thread connection with the latter. The spindle 33 supports a guide roller 34 which operates in the slot 29 in the side of the holder supporting member 9. Looking at the parts as seen in Figure 1, a pull to the right on the pull-out rod 24 will rock the lever 26 until the tail portion 35 of said lever abuts with the head 32. This initially disengages the catch 21 of the lever from the stop lug 28, and further movement of the rod 24 rightwardly causes the same, through the lever 26, to pull the drill holder 1 in the same direction, the roller 34 rolling in the slot 29 in the above operation.

As seen best in Figure 3, the arm 23 is sub jected to the action of a spring 36 which is coiled about the shaft 20 at the point where said shaft projects slightly from the side of the turret 3, one end of the spring 36 being attached in a stationary manner as at 36a to turn with the turret 3 as the latter rotates, the other end of the spring 36 being bent outwardly against the right hand edge portion of the lever 23, whereby to normally tend to shift said lever 23 in the direction of the drill 6 for holding the parts in substantially the normal positions illustrated in Figure 1.

As previously suggested, the timing drum H carried by. the drum shaft III is synchronized in its operation or rotation with the movement of the lead cam I2, and the said drum ll carries one or more contact dogs 31 attachable thereto and engageable incident to the rotation of the drum II with the member 38 of the micro-switch 39 supported in any suitable manner on the frame I of the machine. The micro-switch 39 is connected by suitable wiring to the solenoid or m0- tor I4 and the contact dogs 31 are arranged to engage and move the member 38 of the switch 39 for closing the latter to thereby close the circuit including the solenoid H at predetermined timed intervals related to the movement of the cams of the lead cam I2.

I now particularly refer to Figure 4 in order that the construction of my lead cam as redesigned by me for the purposes of my invention may be understood. The cam [2 will be of the general form customarily employed for controlling different operations of tools carried by the turret 3, including the drill 6. Customarily, there may be as many as six of these tools for performing different operations on the work. It will be noted in the illustration given in Figure 4 that the cam of the lead cam l2 intended for controlling the drilling operation of drill 6 is designated [2a. This cam would ordinarily be constructed with the deep dwells for enabling the lead cam 12 to cause a movement of the turret slide 2 and turret 3 for pull-out actions of the drill.

Since, according to the operation of my improved invention, the pull-out operations for the drill are intended to be performed independently of the lead cam I2, my design of the lead cam l2 as shown by, the full lines in Figure 4 contemplates only the provision of the slight recessing or dwells 40 and 4|. The purpose of these dwells 40 and 4| is to effect a drop-back action of the turret slide and turret substantially instantaneously with the pull-out action of the drill 6,

so that the turret may drop back approximately .015" at the time the drill pull-out operation is performed, the latter taking place almost instantlt' es lelter to be 'described. By such dropback action df 'tlreiturret slide and turret, when lthe drih is :rl-easeWtrau-e-enter the hole after its *mnkout operation, -the point of the drill Will not :hit Jthe bottom-ref th'e hole andibe'c'ome damaged. The-advantage oflthe ioregoing will-:be-more fully appreciated otter :a description-ref "the complete operation f may iimproved invention mow to he given. l

who-operation one, machine iembo-dy'ingwtheim -increments of :my invention, :as disclosed in the idnawings, contemplates rthe toustomary operation of lithe-turret :3 and slide 12.:aretindexedin 'dzheiusual manner fortheapresentation ofatherparaticular tonls carried .infthelopenings :of the iturret 3%, tto the work. tnslpreviously indicated, the only toolillnstrated .Figure. 1 is the drilling means with which my invention thaseto do. lIntzthe machine illustratedafurthermore, the work 4 'issroatatedrln ithewdrilline operation while iheld by :the mlletzti and the drill 5 :iiszstaztionary against roi-However, automatic zscrew :machines :of the type to which my invention may be adapted, rbtlmouision of certain :additional parts, to be conMented-intomonstmctinns utilizing :a rotating *dI'iH'ihHI'dEI-I, iand, rloy. meohanicalnnodification of centainsparts of mylinvention, the latter may be adapted-toisuchmachme's. .-Referring to Iligune 1 particularly; the parts ofimyninvention 1am illustrated in the normal positions assumed therebywhen the :drill B is :being fedjtot-the work -4 as the latter is rotating, and iduringwthis period the drill :is :being moved to the ;-.work:by1the slide movementiof the slide 2 andltur- :retfiunder thedn-fiuence, awe willsay, of the feed -cam-=t2a--of-the;lead cam 42. This cam, of "course, .hasfa' slight-pitch-reccentric to thezaxis of the cam Kl- 2 because the hole-is tusually rdrilled to a certain slight-depth first: and then subsequently drilled to .asecondary slight depth and so on, dependent .40

upon the ultimate required depthof the hole to be produced. During lthe feeding of the drill under the action of the cam surface l-2a ldrill pull-out and ,return operations are :almost simultaneously produced along 1 the lines ,previously described However, it is contemplated in the .nor- 'ma1 position of the-drill when feeding to ,the work that the drill holder 7 shall 'be locked in its .forward l position, as seen "in f Figures-'1 vand '7, by the locking engagement"between'lthe lock member or- "catchQT and thelug 28. engagement maintains the dril'l' rigid'ly "against "movement away "from the work 'as'the turret 'is 'fedforward for the drilling operations.

ther'ca'm l2 has turned to the :point of "the first dWel'lf-or recess 40 thereof, as previously "stated, the slight dep'thnf the dwell 'will permit of drop-backmovementof'th'e turret with the tlrill hold-ing means *thereon to an extent of approximately 1115". It isatthis time that the drum- T l, the movement-of-whioh is synchronized turrets, mentioned above,'the:solenoi-d I4 is ener- .agized:to-sl:iift the-lever fl'limatchetilever 1 9, ratchet wheel ll'zarrn :23', randpull out rod "24. The enerl'gioing of the solenoid :14 islmomentary andeifects the 'ialmost instantaneouspull out action of the drillrfi and return-action of :said dri'll into the hole while the l turret: 3 is rin tts drop-back: posidtion. This the drill '5 from hitting. the ilhottom oirthezholezon-zthenetum movement there-r of les'tablished the breakingot the cirouit fibretween the micro-switdnfl aind the sc'ilenoi'd l! which-releases lthe pfilFout mod :toieause I the (drill and :drill tholtler itoiihe nestoredito their .n'ormal posltionsio'f- Eigure-iltrrom the flpehfited fll pullout positions 'zshownviin- Figures c3; 1'2; :and: 6.

"must vshe understood that "the-initial tpu llx'on the rod-i24 whemthersdienoid I4lis1'energized 'rocks th'e oatch-ilever 26, disengaging the-'rcaitch tar-dock 2 :Ji romlthe lu'g 'Mmnflthe cylin'der 9, renderiing :the holder :under such" conditions m'ovable in a direction away from who work ior rthe pull out action. -In itsrnorm al posltionosnseen in Figure 1, the mull-out rod is sshownas 'limited in its return movement under the influence of the "crank' or -arm -2 3 =by a stop:pin 42 pro5ettinglaterally -from thecylinder or support 9 -=for the holder Theengagement"between the zpartsfl-and fl is maintained by the' action of the sspr-irrg 'ali, which, ofooursemomna'lh'itends to shift-thepulh out red to its advanned driHin-g position relative te' the support.9 and 'the holder 1 in a- 'c*orresponding position locked againstmetreait fromrthe wonk "DY ChB COOBBIaFiGH or the-pants il'l' anil 88.

It is to beiunderstoodof :course, that then'rum- 'ber of pulkout operations for a partiodlar sob --of -'drilling a h'ole-of' acezitaiin lepth will depend upon*thefiepth dimension of the iholey and each time-the drill 6 is ipulled om from -1the-' hol'e in the work'fiwoil from an oil snpply nozzle-antimond-uit will feed on toithe tirillfomcooling and lubrieating the same, =am d-a wiping brush-will' wipe the =drill for cleaning meta'lmartic'les or==cliipsd5herefrom.

When *the drilling operations areperformed by the pull-out controlled drilling means d-escnibed "by-'me-as *my invention, the turret -3-'-may be indexed --for "further "operation on the work by-a difierenttodl' "carried 'thereby, and'this operation "performed "a mnnber of times; dependentmpon the number oftools' intendedto beused'ior mak- "ing the 'p artizn'ilar part constituting the work,

I *contemplate thata eommondorm'ofif electric motor may be "used'ln substitution "for the solenoid for operating a drive shaft, and'th'e movement oflthel'lever .tli .may 'be'tcommunicate'd there'to'lhy any-automatic type ofvreverse' clutching means, should such electric motor last menltionedfbe employed. I

The lead Loam 2, .astshown .in',Fignre -14, has .its cam Ma recessed at #410 4] Ior. eight turret .dropback .qperations'tovdrillecsingle lhole such .as seen .;,for example in-the-workpiece shown ineF'igure 10. The idrill pull outs take place sinrultaneouslyswith the turretdropbaok :actions, as governed by the --eight dogs :32! =(seeEigure 8).. The pieceof work (Eigrure 109 will .be-lcompletelyafinished by operations of the tfi ve other; tools on" the v turret. The

.;tools of .-theiturret .-including my drill controll-ed means, are diagrammatically shown in Figure l Qhviously, manyother kinds of tools maybe availed of :for those selected depend on the particular character of operations to be per- :formed on thework. -In Figure '4- the :dotted line dwells Mn, 42d indicate how tthe-cam l2 would :be made .tor operatinsg tolg-ivie walkout operations --.b y moving-turret 3,, anddiscloses the long "time factor involved zingthe known-;prac.tice "as com-- ipared with If m'y invention. The various (turret movement and :toolmontroloperations are designed on :Figzme s, olearnessldf aunderstanding'zof lmyt'invention.

.i-Having thus wilescfibed airwemnon, what I I movements.

claim as new anddesire to secure by Letters Patent of the United States is: I

1. In a drilling machine, in combination, a drill holder, a drill carried thereby, a-support in which the drillholder is movably mounted, a work holder for supporting work engageable by said drill, a feeding device, for. advancing the drill into the work,- means for periodically moving the holder relatively to its support for pulling the drill out of the work during the feeding movement of the drill to the work, the said pulling out means comprising a releasable latch member to limit the movement of the holder on its support while the drill is being advanced into the work.

2. A machine'as claimed in claim 1, in which a relatively fixed catch on the holder support coacts with the latch means mentioned to fix the position of the holder relative to .its support for drilling operation of the drill, and supporting .means movably connecting the catch to the holder for initial disengagement from the support thereof on actuation of the pull-out means for drill pull-out movement.

3. In a drilling machine, in combination, a drill holder, a drill carried thereby, a support in which the drill holder is movably mounted, a work holder for supporting work engageable by said drill, a feeding device for advancing the drill into the work, pull-out means for the drill connected to the holder, means to actuate the pull--outv means to shift the holder on its support independently of said feeding means to momentarily disengage the drill from the work, and spring means coacting with the pull-out means to return the drill into the work after such momentary disengagement.

4. In a drilling machine, in combination, a drill holder, a drill carried thereby, a supportin which the driller holder is movably mounted, a work holder for supporting work engageable by tt drill, a feeding device for advancing the drill into the work, means for periodically moving the holder relatively to its support for pulling the drill out of the work during thefeeding movement of the drill to the work, and means for causing a drop-back movement of the support for the drill holder away from the work during return movement of the drill' to the work.

'5." In a drilling machine, in combination, a drill I holder, a drill carried thereby, a support in which the drill holder is movably mounted, a work holder for supporting work engageable by said drill, a feeding device for advancing the drill into the work, means for periodically moving the holder relatively to its support for pulling the drill out of the work during the feeding movement of the drill to the work and means for causing a drop-back movement of the support for the drill holder away from the work simultaneously with the drill pull-out and return 6. In a drilling machine, in combination, a drill holder, a drill carried thereby, 'a support in which the drill holder is movably mounted, a work holder for supporting workengageable by said drill, a feeding device for actuating the support for advancing the drill intothe work, a motor, pull-out connections'between the motor and the drill holder, means to periodically cause actuation of the said connections for pull-out and return operations of the drill during operation of the feed device and said support, and instrumentalities to effect a drop-back action of the support simultaneously withthe'drill return move-' ment to prevent impinging of the drill point with :the bottom of the hole, being drilled. I

7. In a turret type automatic screw machine, a turret slide, a tool holding turret mounted thereon and comprising a drill holder support, a

drill holder mounted movably on saidsupport, a. lead cam for causing drill feeding movement of continuing feed action of the slide and turret.

. 8. A machine as claimed in claim '7, in which the last means comprises a pull-back rod connected to the drill holder, a motor unit to actuate said rod, and means on the timing drum to ener- "gize themotor unit for quick movements of said rod. i

9. A machine as claimed in claim 7, in which the last meanscomprises a pull-back rod, a catch member connecting the rod and drill holder, a part on the drill holder support to interlock with said catch member and releasable therefrom on actuation of the rod, a solenoid connected to impart quick movement to the pull rod, and electric circuit closing means on the timing drum to energize the solenoid for operating the pull rod.

' 10. In a drilling machine, in combination, a drill holder,'a drill carried thereby, a support in I which the drill holder is movably mounted, a

work holder for supporting work engageable by said drill, means to rotate the work holder a feeding device for advancing the drill into the work, and electrical means independent of said work holder rotating means to effect quick pullout and return movements of the drill relatively to the work independently of the operation of the feeding device.

11 In a'drilling machine, in combination, a drill holder, a supporting member therefor, work holding means, mechanism for feeding the drill to the work .for operating thereon, and instrumentalities for periodically withdrawing the drill from the work for pull-out action during the feeding operation including a. pull-out device for actuating the drill holder, and means operable by the pull-out device to lock and unlock the drill holder relatively to its supporting member.

12. A machine as claimed in claim l in which the pullout latchmember is combined with a fixed catch upon the holdersupport with which thelatch member releasably coacts :to fix the position of the drill holder relative to its support during the drilling operation of the drill.

13. In a drilling machine, in combination, a movable support, a drill holder thereon, a work holder for supportingwork engageable by a drill on said holder, feedmechanism for feeding the support and its drill holder to work carried by -mined time duringthe feeding movement of the support by'said cam;- and mechanism timed to operate when theupull out section of the lead cam coacts with said member, for actuating the drill holder to effect a drill pull out and return movement of the drill holder.

14. A machine as claimed in claim 13 in which the pull out section of the lead cam consists of a recess arranged to receive an adjacent operating portion of the said member for enabling the drop back movement of the feed support to take place during the feeding movement of the support.

15. In a drilling machine, in combination, a movable support, a drill holder thereon, a work holder for supporting work engageable by a drill on said holder, feed mechanism for feeding the support and its drill holder to Work carried by the Work holder, and including a lead cam and a member operated by the said cam and. connected with the support to cause the feeding movement of said support and drill holder, the lead cam having a pull out section to coact with the said member to control a drop back movement of the support and holder at a predetermined time during the feeding movement of the support by said cam, and mechanism timed to operate when the pull out section of the lead cam coacts with said member, for actuating the drill holder to efiect a drill pull out and return movement of the drill holder, and in which the timed mechanism includes a drum operated in synchronism with the 10 movement of the lead cam, and instrumentalities controlled from said drum for causing the pull out and return movement of the drill holder at a relatively high speed as compared with the speed of the feeding movement.

15. A tool slide feed unit for automatic screw machines comprising a lead cam having a body formed with feed lobes thereon for moving a tool slide, and also formed with at least one drop back recess in the said lobe for controlling a drop back movement of the tool slide in a direction opposite its tool feed movement, and a slide actuating lever having a follower portion with which the lobe and recess portions of the lead cam may engage.

ROBERT E. VANDERHIDE.

REFERENCES CITED UNITED STATES PATENTS Name Date Cone June 9, 1931 FOREIGN PATENTS Country Date Germany Feb. 28, 1891 Number Number

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