US1831547A - Drilling machine - Google Patents

Description

Nov. 10, 1931.. c. scHOLL DRILLING MACHINE- Filed March 1. 1928 5 Sheets-Sheet 2 Nov. 10, 1931. c SCHOLL DRILLING MACHINE Filed March 1. 1928 5 Sheets-Sheet 3 Nov. 10, 1931. c. SCHOLL 1,831,547

DRILLING MACHINE 5 Sheets-Sheet 4 Filed March 1, 1928 Nov. 10, 1931. c SCHOLL DRILLING MACHINE Filed March 1. 1928 5 Sheets-Sheet 5 INVENTOR 6 g BY ATTORNEYQ Patented Nov. 10, 1931 UNITED "STATES PATENT. OFFICE I CLARK SCROLL, OF SPRINGFIELD, OHIO, ASSIGNOB TO THE STEEL PRODUCTS ENGINEERING COMPANY, OF SPRINGFIELD, OHIO, A CORPORATION OF OHIO DRILLING mpcnmn Application filed March 1,

This invention relatesto drilling machines of the automatic type.

One of the objects of my invention is to provide improved mechanism for arresting the tool and withdrawing it from the work at predetermined intervals, and for restoring the tool to working position; a more spec fic object in this connection being to accompllsh this result automatically. I

Another object of the invention is to provide means for automatically varying the depth of cut of each successive drilling operation. I Another object of the invention isto provide for automaticallystopping the feeding action of the tool spindle whenever the spindle ceased to rotate due tounusual pressure thereon.

Other objects. of the invention Wlll appear from the accompanying description and claims. 1 'In the accompanying drawings: Fig. 1-is an elevation of one side of a machine embodying the improvements.

F 2 is a longitudinal section of the drill spin le assembly.

Fig. 3 is a section on the line 3-3 of Fig. 2. Fig. 4 is a section on the line 4-4 of Fig. 2. Fig. .5 is a section on the line 5-5 of Fig. 4. Fig. 6 is a vertical section on the line 6--'6 of Fig. 1.

Fig. 7 is a detail of a fragmentary part of the worm wheel which form a part of the mechanism which feeds the drill and the devices which throw the same into and out of operation.

Fig. 8 is a'section on the line 8--8 of Fig. 6. Fig. Sa-is a side elevation of the feed cam and its associated cam arm.

Fig. 9 is a vertical section on the line 9-9 of Fig. 1. j

' Fig. 10 is a side elevation of a portion of the tripping disk and its pawls. v d

Fig. 11 is a plan view of the tripping disk feed cam and associated parts.

12 is a vertical section on the line 1212 of Fig. 1. I

Fig. 13 is a side elevation of a portion of the devices for automatically arresting the 1928. Serial No. 258,225.

drill. Fig.16 is a bottom plan view of the spindle assembly,and the feeding'devices and withdrawing and restoring devices for same.

Drill spindle assembly 1 Referring first to Figs. 1-5 inclusive, there is shown the construction of the drill spindle assembly. The spindle 1 issecured into the threaded bore of one member 2 of a clutch,

the'other member 3 of which surrounds the member 2' and has a reduced sleeve portion 3 which is journaled upon the reduced extension 2 of the clutch member 2. The clutch member 2 has connected to rotate therewith a metallic disk 4 located between apair of fibre disks 5 and 6 which are connected-to rotate with the clutch member 3. Coil [springs 7 are interposed between the fibre disks 5 and a plug 8 in the end of the clutch member 3 to hold all of the disk in frictional engagement; a collar 9 vformed integrally with the clutch member 2 acting as an abutment. The sleeve portion 3 of the clutch member 3 is fitted on a reduced shouldered portion formed on the forward end of a long sleeve 10 soas to rotate therewith and the rear end of this sleeve has clutch faces 11 adapted to engage with clutch faces 12 is of awell known type having an expanding ring indicated in dotted lines at 19, which engage with the inner surface of a pulley 20 which is driven by the belt 21 from an eleo 100 tric motor 22. The is expanded by a 'lar 25 which is slidably hasits forward. end secured to the extension 2'01? the clutch member 2 and extends rear wardly through the clutch sleeve 13 where it is provided with an enlarged portion 26' having a recess 27 approached by an inclined wall 27', (Fi 5). The clutch sleeve 13 has a pin 28 whic normally lies in the recess 27. In the event however of the stoppage of the drill, which results in slippage of the clutch disks .4, 5 and 6, continued rotation of the clutch sleeve 13 also results in the pin riding upon theinclined wall 27 and sliding'the sleeve 13 to the position shown in Fig. 5 to disengage the clutch teeth 11 and 12 to thereby stoprotation of the parts.

When the clutch teeth 11 and 12 are disengaged in this manner, they are again caused to be engaged with each otherbythe operator inserting in an opening indicated in dotted lines at 29. in the journal 16 a small rod or pin to engage the end of the clutch sleeve 13 and pushing it toward the clutch teeth 11; the drill spindle being turned by hand to the proper point to cause the pin 28 to enter the opening leading to the recess 27. r

Drill feeding mechanism located on the shaft 32 on each side of the worm 31 and its reinforcin ring a shiftable ,clutch member 35 and 36 w ich clutch mem-,

bers are provided with flanges 37 apertu'red to receive pins 38 which extend through the web of the worm so asto rotatably connect the clutch members with the worm (see also Figs. 7 and 8). Loosely mounted-upon an extended portion of the bushin 33 is a spiral pinion 39 which has clutch teet 40 to engage with the clutch teeth of the clutch member 36 to rotate the pinion from the worm wheel. This pinion meshes with the spiral gear 41, fast to a longitudinal shaft 42 (see also Figs. 9 and 16), which has a worm 43 driv'ing'a worm wheel'44 on a transverse shaft45 Suit". ably mounted in the frame.

Connected with the shaft 45 is a sleeve 46' having fast thereto a cam 47. The connection between the shaft and sleeve ispreferably.made through a hand-operated clutch member 48, having clutch teeth 49 movable into and out of engagement with clutch teeth 50 on the sleeve 46 and held in different positions by the spring pressed detent 51, the'purj work.

pose of this connection being to rmit the drill to be withdrawn by hand i necessary independently of the mechanism which feeds it, this being accomplished by disconnecting.

the clutch teeth 49 and 50 and rotating; the

sleeve 46' and cam 47 by a. hand wheel 48" keyed to the sleeve 46, together with the train of devices about to be described. Cooperating with the cam 47 is a cam roller 52 see Figs. 1, 11 and 16) on the freeend of a roc or arm 53. This rocker arm is connected with one end of a transverse shaft 54 (see also Figs. 12 and 16) locatedin suitable bearings in the frame, and connected to the other end of the shaft is an internal gear 55. Meshing with this gear is a pinion 56 connected with one end of a short shaft 57 rotatably mounted in a rocker arm 58 mounttd loosely upon the shaft 54. The other end of this shaft 57 has connected therewith a pinion 59 meshing with shaft 54. Meshing with this gear 60 is a pin ion 61 loosely mounted upon brackets 62 depending from the frame member and this pin sembly mounted therein through the instrumentality of ball bearings 65 which are retained by the ring 66 an nut 67. This sleeve 64 is slidably mounted in a block 68 depending from the frame as shown best in Fig. 12. In the arrangement just described a slow feedin movement is im arted to the spindle assem ly to feed the rill into the DmZl arresting and withdradflng devices so as to position the dogs at various predetermined oints with relation tothe cam 47. Each of t esedogs has an inclined face 72 adapted to make contact with a ivoted spring-pressed pawl 73 carried on t e free a gear 60 which is loosely mounted upon the V end of an arm 74 connected with arock shaft 75. This rock shaft-has an. arm 76 which when the shaft is rocked makes contact with the rod 77 which extends through the shaft 32 previously described, as shown in Fi 6, 7 and 8. This rod has a pair of pins 78 w ich project through slotted openings 79 in the shaft and into slotted openings 80 in the 83- (Figs. 12-15 for detail). Attached. to this eccentric disk is a chain 84 which ex tends rearwardly and is connected with a block 85 (Figs. 1 and 6) which is slidably mounted on a rod 86 about which is coiled alongs ring 87 which has been laced under tension y the operation of fee ing the drill so thatwhen the clutches 36 and 40 are disengaged this spring acts to rotate the gear 60, which through the medium of the pinion 61 and rack 63 withdraws the drill assembly. This withdrawing movement however is controlled by the cam 82,'which has two simiiar inclined faces leading to the high point of the cam. Co-o crating with the cam is a cam roller 88 igs. 1 and 16) mounted between a pair of arms 89 which are pivoted at 90 to a suitable point on the frame. The lower ends of the arms have connected therewith a forwardly extending link 91 which is pivotally connected with an extension-58 of the arm 58. As the gear 60 rotates under the influence of the spring it of course rotates the pinions 56 and 59, but, as the large internal gear has ceased to rotate due to the disengagement of the clutches 32 and 40, the pinion 56 rides around the gear 55,

at a speedcontrolled by the movement of the cam 82, thus controlling the speed of withdrawal of the tool assembly. The initial engagement of the cam roll 88 is with the high part of the cam and the withdrawal movement, of the tool takes place during and 58' are rocked in the opposite direction, thereby causing reverse rotation of the pinions 56 and 59, gear 60 and inion 61, restoring the tool to drilling position.

At this point the clutches 35 and 81 are disengaged and the clutches 36 and40 engaged by reason of a projection 92 (Figs.

- 7 and 16) on the cam 82 striking a beveled nose 93 on a lever 94 pivoted at 95 to a suitable point and having a yoke 96 straddling a pin 97 connected with the pivoted lever 98 which has two pins 99 extending in a rooved collar 100 on the end of the rod 7 which acts to move the rod axially and through the pins 78 shift the clutch members 35 and 36. A spring-pressed pawl 101 having a pair of beveled faces coacts with a pair of beveled faces on a part 102 secured to an offset portion of the lever 98 to yieldably lock the clutches in either of their shifted positions.

When the tool has completed its final drilling operation ,means are provided for disenga 'n% the clutch 15, by operating the clutcfi s ifter 23. Projectingfrom the arm 53 near its pivotal point is a nose 103 carrying a spring pressed pawl 104 (Fig. 13).

This pawl cooperates with inclined faces on operations.

a dog 105 formed on a lever 106 pivoted at 107 to a suitable point on the frame. The lower end of this lever has a pin or pins 108 which project into a grooved collar 109 on the end of a rod 110 (see also Fig. 1). A spring 111 is coiled about the rod and is interposed between the frame and a collar 112 secured to the rod so as tonormally project the rod rearwardly. The rear end of the rod has a collar 113 fixed thereto and in front of this collar there is a block 114 loosely threaded on the rod and having a pin 115 which projects loosely into the lower end of a rocker arm 116 pivoted at 117 to a suitable frame part. The upper end of the rocker arm 116 has a pin 119 which projects into a slot inthe clutch shifter 23. The tendency of the spring 111 is to shift the-rod 110 rearwardly so as to engage the clutch members, but when the pawl 104 rides upon the beveled nose 105' it shifts the rod forwardly to disengage the clutch members. Ahand lever 118 connected with the rocker arm 116 provides a manual means for engaging the clutch members.

M ewris for varying the feed of the drill It has been explained that the disk 69 has openings 71 in which dogs may be secured.

When it is desired to vary the feed of the tool into the work during the drilling opera-' is of such length that at theend of the last 1 drilling operation the cam roller 52 rides upon the inclined surface 4 of the cam to thereby reverse the swinging movement of the arm 53 which allows the spring 86 to rotate the gear 60 in the opposite direction General operation In operation, the dogs 70 are positioned in the opening 71 of the disk 69 to give to each separate drilling operation the depth desired it being the desirable practice to gradually decrease the depth of subsequent drilling The machine may be started with the cam roll 52 at the zero point as shown in Fig. 8a, or by disengaging the clutch teeth 50 the cam maybe rotated with the hand wheel 48 to bring'the drill to working position, in which case the cam roll 52 will be initially located on an inclined portion of the cam. 47. After these preliminary adjustments have been made the operator engages the motor clutch to start rotation of the spindle and the feed cam, the clutches 36 clutch and cam- :for feeding the spindle to feeding cam and starts rotation of the cam points on said disk, each of said dogs being claimed:

and 40. being at this stage engaged and the perform the drilling operation-after it has cam roller 88 being positioned on the high been projected into working position, said part of the cam 82. .The cam 47 rotates and cam being of a length capable of imparting feeds the spindle and its tool through the conthe maximum range of feeding movement to nections described until the first dog on the said spindle by a single rotation thereof, disk 69 rocks the arm 74, which through the shifting devices for simultaneously shifting means described disengages the clutch memsaid clutches, a v disk movable withsaid cam,

bers 36 and 40 and engages the clutch memand a plurality of dogs, together with means bers 35 and 81. This stops the rotation of the for co n ing the s a predetermined 82 whereupon the direction ofrotation of the pted to operate said clutch shifting deloose gear 60 is reversed by the action of the Vicesspring 87 by reason of its connection through the chain 84 and eccentric 83 with this geai,-dey1ces for'said s indle including an internal thereby causing the drillspindle assembly v ng g r, a 0059 g op r ively nto be withdrawn, this withdrawal being cone t d With said spindle, a pair of connected trolled by the action of the roller 88 upon p mons meshing respectively with said 'inthe cam 82 and connection 91 with the arm rn ldriving gear and'said loose gear, a which carries the pinion 57, as it will be e l rm upon which said pinions are carunderstood that the gear 60 can only rotate P me ns for rotating said internal gear as fast as permitted by the movement of th including a clutch, devices rotatable with said pinion 57 about the internal gear 55, which is fl gm n to disengage said clutch, a now stationary. So soon as the cam roller 88 p g connected W th said loose ear to rehas reached the low point of the cam-82, the verse its IOttttlOIl when said 'clutc is disenwithdrawal movement of the spindle assemg g and m ns connected with Said rocker bly has been completed and when the roller m 1 II i I the action of said spring. I 88 starts up the opposite side of the cam 82, n 4 a d g member, atool sp the direction of rotation of the loose gear e ng meehanism for said spindle in-. 60 will be reversed because of the fact that eluding & drive g $10059 g p i y the arm which carries the pinion 59 will be collIiected h i spindle, driving conrocked in the opposite direction causing the 131011 between sald gears, a rocker arm on pinion to rotate in the opposite direction and in h said driving connection is mounted; th b t t the gear (50 d i i 61 t w thdrawing and restoring devices for said f d th d ill bl f dl A th spindle including a spring for rotating said cam surfaces of'the cam 82 are alikethe drill 10986 g ar in the reverse direction to withspindle will be returned a distance equal to r w sald spindle, a double-face cam, a cam a Ina drill, a rotatable spindle, feeding th t f it withd awal, s soon as th cam lever cooperating with said cam having a conll 83 h h d th hi h i t f th nection with said rocker arm to control the cam 82, the clutches are again shifted by conwithdrawal of said spindle and to thereafter tact of the projection 92 of the cam 82 with k id arm o restore the spindle to workthe beveled nose 93, whereupon rotation of P 911; S id feeding mechanism and the cam 82 ceases and rotation of the feed cam l w pg and ring devices including 47 starts to feed the drill into the work. clutch d t a m ns movable with said Having thus described the invention, it is feeding mechamsm to operate said clutch de- I vices to disconnect said drive gear from and d ill, r tat bl d ill i dl connect said cam withsaid driving member,

V means for periodically projecting and withand means movable With the withdrawal and 7 been projected into working position, said cam bei f a le th p bl f i ti g a driving member, a drill assembly having a 'said clutches, and a plurality of adjustable said rotatable member and said drive shaft, a

drawing. the s indle to and f ki restoring devices to operate said clutch deiti i l di g a l t h, means i l di vices. to disconnect the withdrawal and rea clutch and cam for feeding the spindle to g f Ce fr m-andconnect the feeding perform the drilling operation after it has mechalllsm Wlth salddliving member- 5. .In a machine of the character "described,

the maximum range of feeding movement to rotatable member connected With said dIlV- said spindle by a single rotation thereof, mg member, a'driveshaft arranged at right shifting devices for simultaneously shifting angles ,to said drill assembly, gears between devices movable with said cam to operate said second shaft extending parallel with the roclutch shifting devices at predetermined tatable member of said drill assembly, means times in the rotation of said cam. for driving said second shaft from said drive 2. In a drill, a rotatablev drill spindle, shaft including a clutch, a third shaft armeans for periodically projecting and withrangedat right angles to said second shaft drawing the spindle to and from working poand geared thereto, means connecting said s1ti0n including a clutch, means ncluding a third shaft with said drill assembly to feed meme? the drill into the work, a plurality of dogs on said third shaft rotating therewith, devices for withdrawing said drill assembly and restoring the same to working position, means for connecting said devices with said drive shaft including a clutch, a clutch shifter common to said clutches, connections for operating said clutch shifter from said dogs,'and means for operating said clutch shifter from said withdrawing and restoring devices.

In testimony whereof, I have hereunto set my hand this 9th day of February, 1928.

CLARK SCHOLL.

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