US1594429A

US1594429A - Multiple-spindle drilling machine

Info

Publication number: US1594429A
Application number: US604482A
Authority: US
Inventors: John M Rusnak
Original assignee: Pratt and Whitney Co Inc
Current assignee: Pratt and Whitney Co Inc
Priority date: 1922-12-02
Filing date: 1922-12-02
Publication date: 1926-08-03
Anticipated expiration: 1943-08-03

Description

All@ 3 1926.

J. M. RUSNAK MULTIPLE SPINDLE DRILLING MACHINE Filed Dec. 2. 1922 11 SheelzS--Shec` l ATTQRNEY Aug., E 1926. L594A29 J. M1. RUSNAK MULTIPLE SPINDLE DRILLING MACHINE Filed Dec. 2, 1922 l l Sheets-Shes?. 2

ATTGRNEY J. M. RUSNAK MULTIPLE SPINDLE DRILLINGvMACHINE -Filed Dec. 2, 1922 11 Sheets-Shee 3 ATTGRN EY Aug. 3 s. 1926.

J. M. RUSNAK MULTIPLE SPINDLE DRILLING MACHINE Filed Deo. 2. 1922 ll Sheeizs-Sheel 4 J. M. RUSNAK MULTIPLE SPINDLE DRILLING MACHNE Aug. 3 1926.

Sheets-Sheet 5 Filed Dec.

Q0 ATTGRNEY Aug. 3 1926. 1,594,429

l.'l. M.'RUSNAK MULTIPLE. SPINDLE DRILLING- MACHINE bElled/gg. 2.a 11 Sheets-Sheet 6 Eig 7 las 155- 116, n AL f 153 1,/ "1. INVENTQR 14d- 91 f j BY lgn 154, f f5 1586 E ,f 9 ATTORNEY Aug. 3 1926.

J. M. RUSNAK MULTIPLE SPINDLE DRILLING MACHINE Filed Dec. 2, 1922 Aug. 3 1926.

J. M. RUSNAK MULTIPLE SPINDLE DRILLING MACHINE Filed Dec. 2. 1922 11 Sheets-Sheet 8 7 MM .is m

FAST TRAVERSE INVENTOR BYWAR ATTQRNEY J. M. RUSNAK MULTIPLE SPNDLE DRILLING MACHINE Filed Dec'. 2,

192?, 11 Sheets-Sheet' 9 INVENTGR ATTGRNEY J. M. RUSNAK MULTIPLE SPINDLE DRILLING MACHINE Filed Deo.. 2, 1922 11 Sheets-Sheet 10 INVENTR BYJ ATToRNEY lllllllllllllll J. M. RUSNAK MULTIPLE SPINDLE DRILLING IvIACHINIi:I

Filed De@ 2. 1922 ll y 'Sheets-SABG. l1

ATTORNEY Patented Aug.. 3, 192e.,

-T FFICE.

JOHN M. RUSNAK, GIE HARTFRD, CONNECTICUT, ASSIGNOR TO PRATT & WHTTNEY CUMPAN-Y, F NEW YORK, N. Y., A. CORJPRATION OF NEW JERSEY.

MULTIPLE-SPINDLE DRILLNG MAHINE Application filed December?, 1922, Serial No. 604,482.

head and other means is provided for moving the head slowly downward on the i column for feeding or rapidly nin either -direction for traversing. One object of the -invention is to provide an improved drilling machine of theY type stated adaptedto function either as ai,l semi-'automatic machine t wherein all the feeding and traversing W'g-.I Iivements of the head are power operated "and controlled automatically or as a plain @drilling machine wherein only the feeding i 20,-movement is performed by power, the head' being adapted to be traversed in both directions by hand.

Another object of the invention is to provide ai. improved drilling machine adapted to be constructed in its simpler form to provide a hand or plain drilling machine wherein only the feeding of the drill spindies is performed by power, the other operations being performed manually, and in its more complex form, by adding certain mechanism to the said simpler form, to provide a semi-automatic machine wherein the feedning of the drill spindles and the traversing thereof in both directions are automatically performed by power.

Another object of the invention is to provide, in a semi-automatic machine of the type defined, improved means for feeding and traversing lthe drill spindle Ihead and improved means for controlling :the same,

such means including clutches for controlling the speed of the head and other clutches for controlling .the direction of movement thereof and further means cooperating with the clutches for automatically shifting the same to provide the desired feeding and traversing movements. A further object of the invention is to provide a semi-automatic drillingv machine 'U0 of the type stated with improved clutch means for rapidly traversing the head downwardly to the work, slowly feeding 'the head downwardly during the drilling operation and rapidly traversing the head upwardly tov the original position, the head being automatically stopped ina position to again repeat the cycle of operations, and a tappet wheel operatively connected with the head yfor automatically controlling the head mov-y ing means. J

Another object of the invention is to provide, in a machine of the type stated, a dis'- engageable driving connection between the power element and the drill spindle head' ,and means cooperating therewith and preferably on the head for either engaging or disengaging such connection and further cooperating means for automatically disengaging such connection yat the end of aspredetermined feeding movement of the head.

Another object of the invention is to provide a multiple spindle drilling machinev with an improved spindle grouping and driving arrangement.

A further object of the invention isfto l provide a drilling machine of the type stated` with an improved reservoir arrangement, for holding a supply of lubricant, such reservoir being formed by coring'out the base or bed of the machine. l Another object of the invention isto provide an improved counterbalancing mechanism for the drill spindle head, such mechanism providing for anaccurate counterbalancingof the head and safety means in connection therewith for preventing the .dropping of thevhead should the counterbalancing mechanism fail. t r With the above and' other objects in view, my invention consists in the features of construction and operation set forth in the' following speciication and illustrated inthe accompanying drawings. ln such drawings annexed hereto and forming a part of this specification, l have shownv my invention'as embodied in a multiple spindle drilling machine but it will be understood that the invention can be otherwise embodied and that the drawings are not to be construedy as defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

Referring to the figures of the drawings:

Figure l is a front elevation of a combined ses plain and semi-automatic multiple. spindle drilling machine comprising my invention.

Fig.`2,is a side elevation thereof.

Fig. 2a is a fragmentaryenlarged view of a. portion of Fig. 2.

Fig. 3 is an elevation. of the opposite side of the machine.

Fig. 4 is an enlarged fragmentary plan view of a portion of the machine.

Fig. 5 is an end elevation of the feed box with the cover plate removed.

Fig. 6 is an elevation of the other end of the feed box with the cover plate removed.

Fig. 7 is a sectional view therethrough on line 7 7 of Fig. 6.

Fig. 8 is a sectional view thereof on line 8 8 of Figs. 5 and 6.

Fig. 9 is a fragmentary side elevation of a portion of the machine.

Fig. 10 is a rear elevation thereof.

Fig. 11 is a detail view taken on line 11--11 of Fig. 9.

Fig. 12 is a fragmentary plan view of the drill head taken approximately on line 124-12-of Fig. 1.

Fig. 13 is a sectional view thereof on line 13-13 of Fig. 12.

Fig. 14 is a sectional view thereof on line 1414 of Fig. 12.

Fig. 15 is a perspective viewr showing my improved drill head counterbalancing mechanlsm.

Fig. 16 is an enlarged front elevation of the feed box partially in section.

Fig. 17 is a face view of the automatic clutch controlling tappet wheel with the tappets mounted thereon.

v Fig. 18 is a section therethrough on line 18-18 of Fig. 17.

Fig. 19 is a detail sectional view on -line 19-19 of Fig. 17.

Fig. 20 is a plan proiected view of onev of theA levers shown in Fig. 17.

Flgs. 21 and 22 are elevationsrespectively vof plates mounted on the feed box and used 1n connection with the pointers shown in Fig. 16.

Fig. 23 is an enlarged fragmentary sectional view showing in detail certain of the spindle driving mechanism shown in Fig. 14.

Fig. 24 is a fragmentar perspective view of cooperating driving e ements shown in Fig. 23;

Fig. 25 shows several projected views illustrating diagrammatically the various driving elements and connections for movlng the drill head on the column and for rotating the drill spindles.

Fig. 26 is a plan view ofo the improved base or bed plate of my machine.Y

Fig. 27 is a side elevation thereof.

Fig. 28 -is a cross section therethrough l lng the head downwardly to t e work,

on line 28--28 of Fig. 2.6.

Fig. 29 is a cross section on line 29-29 of Fig. 26.

Fig. 30 is a fragmentary detail section taken on line 30-30 of Fig. 26.

Fig. 31 is a fragmentary detail section taken on line 31-31 of Fig. 26.

Fig. 32 is a fra mentary side elevation of the machine s owing the same constructed as a plain drilling machine.

Fig. 33 shows diagrammatic views of the gearing inthe feed box shown in Fig. 32.

Fig. 34 is a diagrammatic view of a portion of the drill head moving mechanism used in the plain drilling machine.

Fig. 35 is a rear view of the column showing certain of my improved counterbalancing mechanism.

Fig. 36 is a cross section through the column on line 36-36 of Fig. 35.

My invention comprises a drilling machine construction so designed that the same, in its simpler form, is a hand or plain drilling machine and in its more complex form becomes a semi-autcznatic drilling machine. In shop terms and in the usual mechanical parlance, such a semi-automatic drilling machine as herein shown and described is known as an automatic multiple spindle drilling machine. However, since such machine is not in fact fully automatic, the same is herein termed semi-automatic. The original cost of a plain drilling machine is considerably less than an automatic or semiautomatic machine and such plainmachine is more adapted to certain classes of work. By adding certain other mechanism to the plain drilling machine illustrated herein, the same may be converted into a semi-automatic drilling machine, which machine is also adapted to be used as a plain drilling machine when desired. lBy such a standardized construction, the manufacture of these two types of drilling machines is greatly simplified and the adaptability of the ide semi-automatic machine to use as a hand machine is of considerable advantage.

The machine comprises in its simpler form a plain drilling machine wherein power means is provided for feeding the drill head downwardly during the drilling operation and manually operated means is provided for traversing the head in either direction on the column.` Means is further provided for automatically disengaging the said power means to stop the feeding at the end of the drilling operation, the operator thereafter moving the head away from the work by the said manually operated means. By adding r:ertainv mechanism to the said simpler form of the machine just described, `the same may be converted into a semi-automatic drilling machine. In such machine, ower means is provided for rapidi travers- Elli ing operation and thereafter rapidly return- Y ing the head to its original position. In

this form of the machine, the operator is only required to place the work and trip a latch which sets the machine in operation. lt should furthermore be understood that, whenever desired, the mechanism added to the simpler form of the machine to make the same semi-automatic may be readily disengaged whereby to render the sameinoperative-.and adapt the semi-automatic machine to perform the functions of .the said plain drilling machine.

Referring more specifically to the drawings by reference characters, 1 indicates the base and 2 the column of my improved drilling machine. Mounted for vertical sliding movement on the column is a drill head 3.

j The head is preferably mounted on the column in the novel manner illustrated in Fig. 12. A pair ofk vertically extending V- shaped recesses 4 are forme-d in the guideway portion 5 of the column and are adapted to receive a pair of V-shapedJ projections 6 on the head. A pair of straps 7 secured to the 'head bybolts 8 engage rear surfaces of the guideway 5 and hold the projections 6 of the head firmly seated within the recesses 4 in the column. In this manner the head is firmly supported and .accuratelyguided in its movements on the column. It should be noted that this construction alsoeliminates the use of the usual taper adjusting gibs. f

' ln a large machine of the type illustrated, the weight of the head 3 is considerable. lt is therefore necessary to counterbalance this weight and this function is preferably accomplished by the novel counterbalancing arrangement shown in Figs. 2 and 15. .A-

main weight 9 movable vertically in the center of the column is connected to the head 3 by a pair of cables 10 passing over sheaves vv11 and 12. The cables, at one end, are respectively secured to the ends of an equalizer bar 13 plvoted at its center to the weight 9 whereby each cable supports an equal portion of the Weight. One cable is secured rigidly to the"head at 14. The other cable is connected to an element 15 mounted inthe head. A spring 16 the lower end of the element l5 and a bushing 17 secured to the head normally forces the element downwardly. rlhe tension on the slidably v cable holds the spring compressed, a washer 18 on the element limiting the upward .movement of the element by contacting with vthe head. A linlr19 the element 15 vwith an arm 20 on a shaft 2l' in the head and provided thereon with a operatively connects toothed member 22 adjacent a vertically ex'- tending raclr 23 on the column. Should the cable break or the tension theren be rebetween leased for any cause, the expansion of the spring 16 will move the member 22 about its pivot and engage the teeth thereon with the rack thereby supporting the head against downward movement.

The rear wall of the column is curved transverselyv to receive therein a second weight 24 movable vertically .within a guard 26 secured to the column (Figs.v 35 and 36)." A centrally located cable 25 passing over sheaves 27 connects the head 3 to the weight 24. The weight 24 is provided with a plurality of varied sized removable sections 24 whereby to compensate for the weight of any parts added or removed from thehead.

opening 26', normally closed by a removable cover plate, is formed in lthe guard 26 whereby the operator may have ready access to the weights 24. In this manner the head may be accurately counterbalanced for l the particular drilling operation to be performed. Also the safety device in connection with one of the cables l() positively pre- -vents a dropping of the drill head should the counterbalancing mechanism fail to support the same.

Rotatably mounted within the head 3 are a plurality of drill driving spindles 28 rotated from a spline shaft 29 through mechanism hereinafter described. The head is adapted to be moved vertically on the colf and other mechanism within a feed box 35 on one side of the column, such mechanism moving the head through a spline shaft 36. Means including a tappet wheel 37 on the other side of the column automatically controls the mechanism within the feed box.

The motor 30 is mounted on a bracket 38 and controlled by a switch controller 39. A pinion 40 on the motor shaft meshes with a gear '41 on a shaft 42 carrying the pulley 33. A pulley '43 between the gear and ,pulley 33 is adapted to drive a lubricating pump 44 through a belt 45. lLf the machine is to be belt driven instead of motor driven, the belt pulley 31 is mounted on the shaft 42 in place of the gear 4l, as shown in Fig. 25. The pulley 33 on the shaft 42 drives a pulley 46 through the belt 34. l driving the spindle spline shaft 29 from the pulley 46 is shown in Fig. 25. rlwo gears 47 and 48 secured to the pulley shaft 49 may respectively'be engaged by

gears

50 and 51 splined for sliding movement on. a parallel rllhe mechanism for shaft 52, a lever 53 being provided for shifting such gears. Two pairs of

gears

54, 55 and 56, 57 are secured to the shaft 52 and are respectively adapted to be engaged by pairs of

gears

58, 59 and 60, 61 slidably splined on a shaft 62, levers 63 and 64 being provided for shifting such gears. A bevel gear 65 journaled within a gear box 66 and within which the shaft 29 is splined for vertical movement, is in engagement with a bevel gear 67 on the end of shaft 62. It will, therefore, be seen that the shaft 29 may be rotated at any one of eight speeds from the change speed gearing within the box 66. To assist the operator in reaching the

levers

53, 63 and 64, I mount a hand rod 68 on the column and provide

steps

69 and 70 on the feedl box 35.

Rotatably mounted in the lower portion of the head 3 are two circularly arranged clusters of drill driving spindles 28. These spindles are rotated from the shaft 29 as follows: A gear 71 on the shaft 29 within the head meshes with a gear 72 on a parallel shaft 73. This shaft 7 3-is located forwardly of the shaft 29 and between the said two clusters of drill driving spindles. A smaller gear 74 on the shaft 73 meshes with a gear 7 5 on each of two shafts 76 respectively adapted to drive the said clusters of spindles. A second gear 77 on each of the shafts 7 6 meshes respectively with gears 7 8 on the spindles 28 in each cluster. It will be noted that the gears 78 are in staggered relation whereby such gears may overlap without interfering with the operation of each other. The lower surface 79 of the head is provided with intersecting T-slots 80 whereby one or a plurality ofdrill supporting arms 81 may be secured to the head. The inner end of each arm is adapted to rotatably support a drill holding spindle proper 82 andl a universal driving connection 83 is adapted to operatively connect each drill spindle 82 to a driving spindle 28.

My novel and improved means for quickly and securely connecting each universal driving connection 83 to a driving spindle 28 is best illustrated in Figs. 14, 23 and 24. The spindle 28 of each gear 78 has bearing ends 78 integrally formedtherewith. A pin or shaft 84 is pinned within the lower end of each gear 78 and thedownwardly projecting end of such shaft is circumferentially grooved at 84. The uppermost element 83 of the universal driving connection 83 is adapted to fit over the grooved end of the shaft 84 and to be operatively connected to the gear 78 by oppositely disposed lugs 85 on the element engaging within slots 85 in the end of the gear. A pair of oppositely disposed screws 86 threaded into the element 83 may be engaged within the groove 84 to hold the element upwardly against the gear with the lugs 85 engaged within the slots 85. As will he noted, the construction provides a rigid driving connection between the gear 78 and the element 83 which connection may be readily and easily engaged or disengaged merely b rotating the screws 86.

The before mentioned shaft 42 extends into the column 2 and is spported in

bearings

87 and 87 therein. echanism within the feed box 35 and operated from this shaft is adaptedv to slowly drive the spline shaft 36 in a manner to feed the head 3 downward for drilling and to rapidly drive shaft 36 for traversing the head in either direction.

A bevel gear 88 and a spur gear 89 on the shaft 42 are respectively adaptedto drive the feeding and traversing mechanisms. It will be understood that the ower traversing mechanism is used only in connection with the semi-automaticmachine. The feed mechanism from the bevel gear 88 will rst be described.

The bevel gear 88 meshes with a bevel gear 90 on a shaft 91 extending into the feed box 35. A worm 92 on this shaft engages a worm wheel 93 on a shaft 94 extending parallel with the shaft 42. A gear 95 keyed to the'outer end of shaft 94 drives a gear 96 keyed to a shaft 97 through an .idler gear 98 carried by an arm 99 mounted to swing about the shaft 94. Eight different sized gears 96 are provided, any one of which may be keyed to the shaft 97. The gears 96 not in use may be stored in compartments 96 in the base of the machine. The idler gear 98 is always in mesh with gear .95 and the arm 99 may be swung about the shaft 94 to meshthe idler with any one of the different sized gears 96, a clamping bolt 100 being provided on the feed box and extending through a slot 101 in the arm for securing the arm in place. llt will, therefore, be seen ,that the shaft 97 may be driven at any one of eight speeds from the shaft 94. A removable cover plate 102 provides easy access to these change gears. The shaft 97 is adapted to drive a parallel shaft 103 through change speed gears 104 and 105 on such shafts, the gears 104 being keyed to shaft 97 and th`e gears 105 being loose on shaft 103. A key 106 slidable within the shaft 103 is adapted to operatively connect any one of ears 105 to such shaft. The key is operated from a shaft 107 having a pinion 108thereon meshin with a circular rack' 109 on which the tliey is mounted. The shaft 107 is operated from a parallel shaft 110 having an outside operating handle 111 and operatively connected to the shaft 107 by inter- From the mechanism just described, it will be seen that the spline shaft 36 may be driven from the bevel gear 88 on the shaft 42 at anyone of' twenty-four speeds, each of the eight speeds obtained by change gears 96 being multiplied by the three speeds obtained by sliding the key 106. The primary function of the sliding key change gearing is to slightly vary the feeding speed obtained by the change gear 96. This feeding mechanism may also be made operative or inoperative by shifting the clutch 116 into or out of engagement with the bevel gear 113.

This mechanism as thus far described is substantially the same as that used in the.

plain drilling machine illustrated in Figs. 32, 33 and 34.

The spline shaft 36 is adapted to be rotated rapidly from the gear 89 for traversing `the drill head in either direction through the following mechanism: The gear 89 meshes with an idler gear 117 in mesh with a gear 118 loose on thel shaft 94 within the feed box 35. The gear 118 meshes With a gear 119 loose on a shaft 120. A clutch 121 splined to this shaft is adapted to oper-ativelyconnect the gear 119 to the shaft 120 when desired. A bevel" gear 122 keyed to the end of shaft 120 mesheswith two

bevel gears

123 and 124 loose on a vertical lshaft. 125 adjacent aud parallel to the spline shaft 36. A double' clutch 126 splined to the shaft 125 may be shifted into clutching engagement with either of lbevel gears 123 or 124. A gear 127 is mounted on a sleeve 128 keyed to the shaft 125. This gear is frictionally mounted on the sleeve between a shoulder 129 integral therewith and a plate 130 slidable threon, a spring 131 normally operating to force the plate toward the shoulder in a manner to frictionally squeeze the gear between friction disks 129 and v130 adjacent the shoulder and plate. This gear 127 meshes with a pinion 132 keyed to the spline shaft 36.

Through the mechanism just described the spline shaft 36 may be driven at a relatively rapid speed from the gear 89 on the shaft 42. By shifting the clutch 126 to-engage

bevel gears

123 or 124, the shaft 36 may be driven in one direction or the other. This mechanism may also lbe* made operative or inoperative by shifting the clutch 121 into or out of engagement with the ear 119. The frictionally mounted gear127 1s adapted to slip and thereby prevent shock tothe machine when the rapid traverse mechanism is thrown into operation.

The feed clutch 116 may be shifted by a yoke 133 and the traversing clutch 121 may be shifted by a yoke 134. In order to revent the simultaneous engagement of t ese clutches and for the purpose' of engaging one elutchwhen disengaging the other, these clutches are connected together by a rod 135 clutches.

adjustably jointed at 136. The shifting of the clutches in both directions is limited by set screws 137 and 138 screw threaded into arms 137n and 138a on the yoke 133 and adapted to engage the lugs 137b and 138" on the box 35. The clutch yoke 134 is mounted on a shaft 139 which extends through the box 35 and column 2, as shown in Figs. 1 and 4. One end of the shaft projects outwardly of theV feed box and is squared at 139 to receive a wrench for shift ing the clutches manually. 0n this end of the shaft is mounted an arm 140l having a shaped plug 140 seated in its free end. A il-shaped plunger 141 above the shaft is pressed downwardly by a spring 142 into engagement with the ll-shaped plug 140 in the end of the arm whepeby to assist the shaft 139 to fully engage one or the other of

clutches

116 and 121. The spring and plunger are held in place by a threaded plug 143.

By reference to Fig. 7 it will be seen that the clutch shoes 133v and 134 engaging respectively within the clutch .

grooves

116 and 121 are slightly narrower than the said grooves whereby the shoes are permitted a limited free movement axially of the The mechanism is so adjusted that the ll-shaped plug 140 is moved past the center of the spring pressed plunger 141 before the clutch being disengaged is fully disengaged whereby such plunger operates to' quickly snap the clutch out of engagement and thus avoid driving the mechanism with only the ends of the clutch teeth engaged. The'loose mounting of the clutch shoes as above described permits this quick disengaging movement of the clutches independently of the clutch shifting mechanism.V This function eliminates the crumbling away of the ends of the clutch ily understood. A pointer 144 adjacent the squared shaft end 139 is adapted to indicate on a plate 145` whether the fast traversing clutch 121 or the feed clutch 116 is in the engaged position. I

The clutch 126 is shifted by a` yoke 146 mounted on a shaft 147. One end of the shaft 147 projects outwardly of the feed boX 35 and is squared at 147 to receive a. wrench for shifting the clutch 126 manually. @n this end of the shaft is mounted an arm 148 having a V-shaped plug 148 seated in its free end. A V-'shaped plunger 149 above the shaft is pressed downwardly by a spring 150 into engagement with the V-shaped plug 148 in the end of the arm whereby, to assist the shaft 147 to fully engage the clutch 126 with one or the other of the

bevel gears

123 and 124. The spring and plunger are held in place by a threaded plug 151. By reference to Fig. 7 it will be. seen that the clutch shoes 146 engaging within the clutch groove 126. are slightly narrower than the said groove teeth as will be readwhereby the shoes are permitted a limited free movement axially of the clutch. The mechanism is so adjusted that the V-shaped plug 148 is moved past the center of the spring pressed plunger 149 before the clutch 'is fully disengaged from one or the other of the

bevel gears

123 and 124 whereby such plunger operates to quickly snap the clutch out of engagement and thus avoid driving the mechanism with only the ends of the clutch teeth engaged. The loose mounting of the clutch shoes as above defined permits this quick disengaging movement of the clutch independently ofthe clutch shifting mechanism as has been heretofore described in connection with

clutches

116 and 121. A pointer 152 adjacent the squared shaft end 147 is adapted to indicate on a plate 153 whether the clutch 126 is engaged with the head lowering bevel gear 123 or the head elevating bevel gear 124. Y

The shaft 147 is operatively connected to a shaft 154 by means of

arms

155 and 156 secured to such shafts and connected by a link 157. The shaft 154 extends through the box 35 and the column 2 as shown in Figs. 1 and 4. The shifting of the clutch 126 in both directions is limited by

set screws

158 and 159 screw threaded into branches 158a and 159a of an arm pinned to the shaft 154, the set screws being adapted to engage lugs 158b and 159h on the box 35. The mechanism for automatically shifting the clutches through the

shafts

139 and 154 will be hereinafter described.

Integral with the arm 148 within a box 160 is a horizontally extending arm 161 (Fig. 16) having a latch plug 162 seated in the free end thereof. A bell crank lever pivoted at 163 has a latch plug 164 seated in the end of a vertical arm thereof, such latch being adapted to cooperate with the latch 162. A spring pressed plunger 165 normally keeps the latch 164 engaged with the latch 162. A rod 166 connects a horizontal arm 167 of this lever with a horizontal arm of a bell crank 168. A horizontal rod 169 connects a vertical arm of the bell crank 168 with an arm of a foot pedal 176 at the front ofthe machine. When the shaft 147 is`rotated to shift the clutch 126 from engagement with the bevel gear 124 toward bevel gear 123, the latch 164 engages4r latch 162 and holds the clutch and its connected parts in the position shown in Figs. 7 and 16. It will be noted that the clutch is thus held in the neutral position and that the V- shaped plug 148 is beyond the center of the spring pressed plunger 149. When the operator steps on the pedal 170, the latch 164 will permit the plunger 149 to engage the clutch 126 with the bevel 'gear 123 to cause a rapid downward traversing of the head 3 as hereinafter described.

The head 3 is moved vertically on the column 2 from the spline shaft 36 through the following mechanism: The rack 23 secured to the column is engaged by a pinion 171 on a shaft 172 mounted in the head 3. The following mechanism housed by a casing .173' provides a driving connection between the spline shaft 36 and the rack pinion shaft 17 2. A housing 174 is mounted for swinging movement on the shaft 36 within the casing 173. This housing carries a pinion 17 5I splined to the shaft 36 and a second intermeshing pinion 176 on a shaft 177. Integrally or otherwise secured to the pinion 176 is a worm 178 adapted 'to be engaged with a worm wheel 179 on a shaft 180. A pinion 181 on the shaft .180 is in mesh with a gear 182 on the rack pinion shaft 172.

A spring pressed plunger 183 mounted in the casing 173 (Fig. 12) and engaging against a projecting portion 184 of the housing 174 normally swings the housing about the shaft 36 in a direction to disengage the worm 178 from the worm wheel 179. An arm 185 secured to a horizontal shaft 186 is provided with a set screw 187 in its free end adapted to engage a rearwardly extending projection 188 on the housing. A horizontal rod 189 slidably mounted on the casing 173 (Fig. 2a) has the rear end thereof connected to thefree end 190 of a second 95 arm 191 secured to the end of the shaft 186.

A lever pivoted at 192 has one arm 193 thereof adapted to engage a collar 194 on the rod and a secondarm 195 operatively connected by a rod 196 to a handle 197 piv- 100 oted on the head 3. Movement of the han dle 197 inwardly moves the rod 189 in a direction to engage the worm 178 with the worm wheel 17 9. A latch rod 198 normally forced into engagement with the rod 189 by 105 a spring 199 is adapted to engage a notch 200 in the rod to hold the worm engaged with the worm wheel. The said lever pivoted at 192 has a'third arm 201 extending to such a position above a collar 202 on the 110 rod 198 that outward movement of the handle 197 will withdraw the rod 198 and permit the spring pressed plunger 183 to disengage the worm from the worm wheel and thus stop the feeding or transversing 115 movement of the head. A stop collar 189 on the rod 189 limits the inward movement of the-rod.

When using the machine as a hand or plain drilling machine; as hereinafter more 120 fully described, it is desirable thaty means be provided for automatically stopping the downward movement of the head at the end of the desired drilling operation. Such mechanism is herein provided as follows: 125 Beneath the horizontal shaft 186 is a shaft 203 on one end of which is an arm 204 operatively connected to the latch rod 198. A second arm 205 on the shaft 203 has a bifurcated end extending about the hand rod 68. 130

A stop collar 206 on lthe rod 68 is adapted to be engaged by the arm 205 upon the downward movement of the head whereby the latch rod 198 is withdrawn and the worm 178 automatically disengaged. The stop collar may be secured in any desired position on the rod 68 by means of a hand screw 207.

rllhe head 3 may be moved manually on the column by mean-s of a shaft 208 having a hand wheel 209 thereon located most conveniently to the operator centrally and forwardly ofthe head 3. On 4the inner end of this shaft is a bevel gear 210 meshing with a bevel gear 211 on a shaft 212. A spur gear 213 on shaft 212 meshes with a gear 214 on the rack pinion shaft 17 2. The hand wheel is mounted loosely lon the shaft 208 whereby the same is not rotated during the automatic operation of the machine. rlFhe hub of the hand wheel is provided with clutch teeth adapted to engage cooperating teeth on an element 215 keyed to the shaft. A spring 216 normally holds the clutch teeth disengaged, a knob 217 being threaded to the outer end of the shaft for holding the teeth engaged against the action of the spring.

As heretofore stated, in the automatic drilling machine, the feeding and travers` ing

clutches

116 and 121 respectively and the double reversing` clutch or clutches 126 are controlled automatically. As illustrated in the drawings, such control is by the tap.

pet wheel'37 mounted on a shaft 218. This wheel is located in a box or casing 219 on the opposite side of the column 2 from the feed box 35 and tappets on the wheel cooperate with the

clutch shafts

139 and 154 to control the clutches as hereinafter described. The wheel is rotated from the rack pinion shaft 172 through the following mechanism: An extension 220 (Fig. 12) is pinned to the end of the rack pinion shaft 172. A bevel gear 221 loosely mounted on this extensibn is provided with clutch teeth adapted to be engaged by clutch teeth on an element 222 splined to the outer end of the extension. rlhe element 222 is slidably supported inl an opening in a bracket box 223 secured to the head 3 and is provided with an operating knob 224. A spring 225 surrounding the extension and bearing 'against a nut 226 thereon normally holds the clutch element engaged with the gear, a detent 227 spring pressed by a plunger 228 may engage a shoulder 229 on the element to hold the same in a disengaged position. The detent is mounted on a shaft 230 which is provided with a handle 231 for rotating the shaft to disengage the detenta A horizontal shaft 232 is provided with a bevel gear 233 on one end in mesh with the bevel gear 221, a bevel gear 234 on the other end thereof meshing with a bevel gear 235 Journaled for rotation in an extension 223 of the bracket 223 and splined to a vertical shaft 236. .lhe lower end of this shaft 236 extends into the tappet wheel casing 219 and has a bevel gear 237 thereon meshing with a large bevel gear 238 on the tappet wheel shaft 218. The tappet wheel will be rotated from the rack pinion shaft in the direction of the arrow a (Fig. 17) when th-e head 3 is moved downwardly and in the direction of the arrow 'b when the head 3 is moved upwardly.

The clutch operating shafts 139'and 154 extend into the casing 219 to a position adjacent the tappet wheel 37. .The shaft 154 has an arm 239 thereon rearwardly of the tappet wheel and provided with a pin 240 in its free end extending forwardly toward the wheel. The shaft 139 is operatively connected to -a short'shaft 241 opposite the shaft 154 in the casing 219 by means of

arms

242 and 243 secured to such shafts and connected by a link 244. The shaft 241 has an arm 245 thereon forwardly of the tappet wheel and provided with a pin 246 in its free end extending rearwardly toward the wheel. The tappet wheel has three

tappets

247, 248 and 249 adjustably mounted thereon for cooperating with the pins 240 and 246.

The tappet 247 has a forward cam surface 247a for engaging the pin 246 to rotate the shaft 139 'in a direction to disengage fast clutch 121 and` engage slow clutch 116 and a rear cam surface 247b for engaging the pin 240 to rotate the shaft 154 in a direction to shift clutch 126 from engagement with the head lowering bevel gear 123 to engagementwith the head elevating bevel gear 124 (the tappet wheel' rotating in the direction of arrow a, head moving downward). The tappet 248 has a forward cam surface 248a for engaging the pin 246 to rotate vthe shaft 139 in the opposite direction (tappet wheel rotating in direction of arrow 0,.) The tappet 249 has a rear cam tion (tappet wheel rotating in direction of arrow '6, head moving upward). The tappet 247 is provided with a bevel surface m for permitting the passage of the spring pressed pin 246 upon the reverse rotation (arrow Z2) of the tappet wheel. The con- -llO `surface .2.49b for engaging the pin 240 to` rotate the shaft 154 in the opposite direcsecutive operation of these tappets on the certain cooperating elements thereto whereby the same is rendered capable of performing drilling operations automatically. The machine illustrated in the drawings is such a `semi-automatic drilling machine and the opera-tion thereof will now be described.

f Operation semi-automatic machine.

The following operations and adjustments are necessary before performing automatic drilling operations on the machine shown in the drawings. The head 3 is illustrated as provided with twenty-four drill driving spindles 28 and an equal number of dr1ll spindles 82 mounted on supporting arms 81 may be driven therefrom.v The required number of arms 81 are first mounted on the head with the spindles 82 in the proper position for performing the desired drillingoperation. The worm 178 is engaged with the worm wheel 179 and is never disengaged therefrom (during the operation of the automatic drilling machine, except in an emergency. The automatic feed stop is used only in connection with the plain drillingr machine .and therefore the stop collar 206 is either removed or placed in an inoperative position on the rod 68. The clutch at 21 5 is left in an open position wherein the hand wheel 209 is notrotated with its shaft 208. The element 222 (Fig. 12) is engaged with the bevel gear 221 whereby to rotate the tappet wheel 37 from the rack and pinion shaft 172. They proper gear 96 for giving the desired feeding speed is selected and secured in its driving position on the shaft 97. The feeding speed obtained from this gear may be further varied merely by shifting the Lkey 106. This arrangement is of particular advantage since it frequently happens that a slightly greater or less feeding speed results in a great improvement in the operation and efciency of the machine as well as in the character of the work performed. The

levers

53, 63 and 64 are also. shifted tothe proper positions to rotate the drill spindles at the required speed. Assuming that the head 3 is in its up position removed from the work, the clutches are set as follows: The shaft 139 is rotated manually to the left (Fig. 7) to engage the traversing clutch 121 and the clutch shaft 147 -is rotated manually to the left (Fig. 7) to place the parts in the position shown in Figs. 7 and 16. The tappets ,247, 248 and 249 are also adjusted on` the tappet wheel 37 to the proper positions for giving the desired movements tothe head as hereinand thata work piece has been fixed in the drilling position beneath the head, the operator depresses the foot pedal 170 to start the operation of the machine. The latch 162 being released 'from the holding latch 164, the spring pressed plunger 149 rides downwardly against the V-shaped plug 148 and rotates the shaft 147 in a manner to engage the clutch 126 with the head lowering bevel gear 123. The head 3 is thus traversed rapidly downward, the tappet wheel 37 being rotated in the direction of the arrow a (Fig. 17). This movement of the head continues until the drills approach the work piece and the driving mechanism is interrupted by the tappet 247.

Tappe# operation.

The forward cam surface 247a of the tappet` 247 engages the pin 246 and through the shafts 241 argl 139 disengages the traversing clutch 121 and engages the feed clutch 116,

the spring pressed plunger 141 fully completing this clutch shifting operation. The rear cam surface 247b of this tappet engages the pin 240 and through the

shafts

154 and 147 shifts the clutch 126 from engagement .the tappet wheel) engages the pin 246, and

the cam surface 248a through such pin and shaft 139 disengages the feed clutch 116 and' engages'the traversing clutch 121. Since the clutch 126 is in engagement with the head elevating bevel gear 124, the head will be rapidly traversed upwardly, the tappet wheel reversing to rotate in the direction shown by arrow b; This movement of the head continues until interrupted by the tappet 249. The cam surface 249b of such tappet engages the pin 240 and through the

shafts

154 and 147 shifts the clutch 126 from engagement with bevel gear 124 upward toward bevel gear 123. The latch 164, however, prevents .the engagement of clutch 126 with the bevel gear 123 and holds the parts in the relative positions shown in Figs. 7 and 16. The head now remains at rest in its original starting position while the operator removes the drilled work piece and places another piece in osition, for the next drilling operation. I`)Upon a'gain depressing the pedal 170, thespring pressed plunger 149 again automatica 1y enga es the clutch 126 with the bevel gear 123 wereupon the head starts rapidly downward and the cycle of operations above enumerated are repeated.

I f. for any reason the operator deslres to iso iently for the operator on the front portion of the head 3.

y Operation-Plain drilling machine. lltmay frequently be desired to perform VYcertain drilling operations without making the adjustments hecessary to operate the machine automatically. ln quantity production where many identical work pieces are to be drilled all in the same manner, the automatic machine is particularly advantageous and efficient. However, where only a few pieces are to be drilled in the same manner, such operations can frequently be performed more readily on a plain drilling machine. My invention, in its simpler form, contemplates such a plain drilling machine and the automatic machine illustrated may be used as a plain drilling machine when desired by making the following adjustments.

rlfhe screw knob 217 should be tightened to engage the hand wheel 209 with its shaft 208. The stop collar 206 should be secured to the hand rod '58 in a position to stop the 1 feeding movement of the head at the completion of the drilling operation. The clutch at 222 is disengaged whereby the tappet wheel 37 is rendered inoperative. rl`he clutch l 126 is placed in the neutral position as shown in lFig. 7 and the feed clutch. 116 isengaged, the traversing clutch 121 being held disengaged through the rod 135. The gearing is adjusted to give the proper rotation and feeding speeds to the `drill spindles, which spindles are also' set and adjusted as above described in connection with the automatic operation of the machine. The worm 178 is left in a disengaged position until the feeding of the head is to be started. With the automatic mechanism thus disenga ed, the machine becomes substantially a p ain drilling machine and the operation thereof is as follows.

Assuming that the several parts of the machine have been set and adjusted as above outlined` that power is being applied tothe shaft 42 to rotate the drill spindles andv to .drive the feed gearing within the feed box 35 and that a Work iece has been fixed in the drilling position neat-h the head 3, the operator rotates the hand wheel 209 in a direction to' move the head downwardly until the drills approach or engage the work piece.. The operator then pushes the hand lever 197 inwardly to engage the worm 178 with the worm wheel 179 whereupon the head is fed downwardly at speed. This operaby the column whic tion continues until arm 205 engages the stop collar 206 whereupon the shaft 203 is rotated and the latch rod 198 withdrawn, The spring pressed plunger 183 immediately operates to disengage the worm and thereby part-s of the machine are the same as hereto-,

fore described in connection with the semiautomatic drilling machine, a plain feed box 35"l however being-substituted for the automatic feed box 35. Thefeed gearing within this feed box, illustrated diagrammatically in Fig. 33, is the same feed gearing heretofore described in 'connection with the semiautomatic machine, the rapid power traversing mechanism and the automatic features however being omitted. rlhe reference chiar` acters indicatingv these identical parts in lFigs. 32, 33 and 34 are primed reference characters corresponding to those used in liv. 25.

'.llhe clutch 116a may be shifted by applying a crank or wrench /to the squared end 116b of a shaft 116c operatively connected to the clutch. rli`his gearing provides a power feed for the head as heretofore described,

the head being traversed manually in either .shown in Fig. 25. llt is believed that the construction and operation of this machine will be understood from the description heretofore given and for this reason, further description thereof appears to be unnecessary.

1n Figs. 26 to 31, inclusive, :1 have illustrated'in detail/the novel base or bed plate 1 for supporting either type of machine above described. s base is of a flat platelike construction having a column supporting part 250 and a. work supporting part 251. The column supporting part 250 has an upper column supporting surface or portion 252 and a lower floor engaging surface or portion 253. IThe space between these vportions is cored out at 254 to provide an oil reservoir for the machine. The center of the portion 252 is provided with a large cored openin 255 normally covered tli seats on the surface 252 around suchopening, bolts 256 thread.- ing into the portion 252 being adapted to lae