US1760430A

US1760430A - Drilling machine

Info

Publication number: US1760430A
Application number: US665048A
Authority: US
Inventors: James F Mirrielees
Original assignee: AVEY DRILLING MACHINE CO
Current assignee: AVEY DRILLING MACHINE CO
Priority date: 1923-09-27
Filing date: 1923-09-27
Publication date: 1930-05-27
Anticipated expiration: 1947-05-27

Description

May 277', 1930. I

J. F. MIRRIELEES DRILLING MACHINE Filed 581012.27, 1925 9 Sheets-Sheet 1 K 39 3J' i Ultim May 27, 1930. J. F. MIR'RIELl-:Es l. 1,760,430

DRILLING MACHINE Filed Sept. 27, 1923 9 Sheets-Sheet 2 C) JW vMay 27, 1930,. J. F. MIRRIELEES I DRILLNG MACHINE tFiled Sept. 27, 1923 v 9 Sheets-Sheet 3 wflu May 27, 1930. J. F. MIRRlr-:LEES- DRILLING MACHINE Filed Sept. 27, 1923 9 Shets-Sheet 4 MN @im Y rMay 27, 1930. J. F. MIRRIELEES 11,760,430 l DRI'LLING MACHINE l Filed sept. 27, i923 'l 9 sheets-sheet 5 y 'ff @TW-MW ams @www5 .5 mw www Smm. l mm mw @e me t NXHMI l- QQ@ fr I @@Q wm. f hw QQ K j m i J m J. F. Miami-:LEES

DRILLING MACHINE Filed Sept. 27, 19215` May 27, 1930.

May 27, 1930.

.1.l F. MIRRIELEES DRILLING MACHINE Nxmv.

JAMES .'F;

` cient in operation.

`Patented May Z7, 1930 UNITED N:siuxrns PATENT" osmos- MIRRIELEES, CINCINNATI, OHIO, ASSIGNOR TO THE A V'E'SZ` DRILLING MACHINE CCL,` OF CINCINNATI, OHIO, A. CORPGRATION OF OHIO DRILLING MACHINE Application. filed September 27, 1.923. Serial No. 665,048.

This invention relates to drilling machines of the upright or vertical spindle type and has for its primary object to provide a new and improved machine of this class which is in construction and ei# Further important objects of my invention zare to provide a positivefreturn movement of the spindle, to provide a rapid approach of the spindle toward the `work and a normal feed during the drilling operation, to provide adjustable means for automatically throwing `out the rapid approach, to eliminate all danger of injury to the machine or the tool re sulting from improper adjustment of the automatic throw-out of the rapid approach, to

provide a sensitive or belt driven drilling macliinewvith the feed mechanism Ilocated entirely `in the head, and toprovide' an improved belt drive mechanisi The many other objects and advantagesof my improved drilling machine will be better understood by reference "to the following specification when considered in connection f with the accompanying `drawings illustrating a F selected embodiment thereof, in which Figi. l is a side elevation of the drilling machine complete with the exception of the base portion of the standard which has ybeen broken away.` j

Fig.` 2 is a front elevationof the adjustable. supporting and guiding head and parts carried thereby. i

Fig. 3 isa side elevation, opposite to that shown in Fig. 1,'of the parts shown in Fig. 2.

Fig. 4 is a detail plan view of the spindle driving mechanism.

Fig. 5 is a section on the line 5-5 of Fig. 4.

Fig. 6 is a horizontal section on the line 6-6 of Fig. l. Y

Fig. 7 is a detail front elevation of the feed control box with the front cover removed.

Fig. 8 is a section on the line 8-8 of Fig. 7.

Fig. 9 is a vertical section on theline 9-9 of Fig. 6. j

Fig. 10 is a vertical section on the line iiD-10 of Fig.` 9.

. Fig. l1 is a vertical section on the line ll-ll of Fig. 6.

keyed thereto.

Fig. l2 is ahorizontal section on the line 12--12 of Fig. 9, and F Fig. 13 is adetail vertical sectional view of the driving mechanism for the feed shaft.

Referring to the drawings, the machine comprises the usual hollow vertical standard 2O provided with a forwardly projecting portion 21, the outer end 23 of which has `upper and lower bearings 24 for the drill spindle 22. A driving pulley 25 is splined to the spindle and is arranged betweenthe bearings. The spindle is provided withthe usual supporting sleeve 26 mounted in the guiding head 27. This head 27 is vertically adjustable on the usual guide 28 onthe front face ofthe standard 20. l

The spindle i22`is connected to a horizontal power shaft 29 supported in the rear of the standard`- and having a stepped pulley 30 A driving belt 3l passes about the pulleys and 30 and is supported and guidedby horizontally disposed

idlers

32 and 33 mounted on a carriage 34. This carriageis slidable on horizontal tracks or

guides

35 and 36 on the upper face ofthe rearwardly projecting portion 37 of the standard 20. The belt 3l also passes between

vertical idlers

38 and 39 on theforward portion of the standard. The position of the carriage 34 is adjusted by a screw 40 having operating handles 4l and 42, to tensionthe belt 31 when the latter engages different steps of the pulley 30. As `usual pulley 30 is adjustable on shaft 29 to bring any one of its steps in line with the belt. The `screw 40 is supported on the standard 20 and passes through the lower portion of the carriage 34 (Fig. 5).

. The idlers 32and 33 are substantially identical in form `except that the idler 32 is slightly elevated about the idler 33 in order to prevent interference of the two reaches of the belt. A description of one of theseidlers and its support will apply equally to the other idler. The idler 33 is revolubly mounted on the shaft 43 and is provided with a bore within which ball-bearings 44 are arranged. These bearings are spacedandmaintained in position on the shaft by a sleeve 45 and threaded collars 46 Aand 47 which engage the inner portions of the bearings. Gppositely disposed rings 48 and 49 threaded into the ends of the idler bore engage the outer portions of the bearings and prevent endwise movement of the idler. The reduced

extremities

50 and 51 of the shaft are engaged and supported respectively by adjusting screws 52 and 53 to enable the shaft to be set at an angle to provide perfect tracking of the belt. The ends of the shaft 43 are flattened and it within

vertical slots

54 and 55 in the carriage to hold the shaft against rotation, the slots being open at their upper ends to permit the idler to be lifted therefrom when the endless drive belt is changed.

The forward or

vertical idlers

38 and 39 are rigidly supported on the standard or column. These idlers are arranged closely adjacent each other to assist the tracking of the belt over the idlers 32 and 33V and also make possible a greater arc of vContact on the spindle pulley. This arc ismaintained regardless of which step on the pulley 30 happens to be driving the belt. A guard plate 56 for the belt 31 is secured upon the head 21.

The spindle sleeve 26 is preferably bal'- anced by a counterweight 57 and is raised or lowered by means of the usual rack 58 actuated by a pinion 59. The enlarged lower end of the spindle 22 and the usual collar 61 engaging the upper end of the sleeve insure the vertical movement of the spindle with the sleeve but permit the free rotation of the spindle. Upper and lower brackets 62 and -63 are adjustably clamped to the sleeve and are provided with adjustable trips or' stop

screws

64 and 65 for controlling the reclprocating movement of the spindle in the manner which will be described hereinafter.

A vertical drive shaft for the spindle feed mechanism is supported by bearings 76 and 77 in a feed box or housing 60 on the guiding head27 (Fig. 9) and is driven from the drill spindle 22 through the t-rain of gearing 78, 79 and 80 (Fig. 13) mounted on the portion 21 of the standard and enclosed in .suitable housing 81 attached thereto. The gear 78 is splined upon the spindle and is supported by the lower bearing 24. The gear 79 is secured upon a stud shaft 82 supported in a bearing 83 in the housing 81. The gear is supported by a bearing 84 and is splined to the shaft 75 which slides through the gear as the adjustable guiding head 27 is raised and lowered. n

Ahelical pinion 85 (Figs. 9, 10 and 12) is formed integral with the shaft 75 and is permanently iny mesh with a helical gear 86 on the horizontal countershaft 87. The shaft 87 extends in fore and aft direction and is supported by bearings 88 in the feed boX 60. Sliding gears 89 and 90 are splined upon this shaft 87 and are adapted to be respectively moved into mesh with gears '91 and 92 fixed upon a parallel countershaft 93 (Figs. 11

and 12). Sliding gears 94 and 95 are similarly splined upon the shaft 93 to mesh with

gears

96 and 97 fixed on the shaft 87. The

gears

89 and 90 are secured together and are adapted to be moved longitudinally of the shaft 87 by a shifter rod 98. The gears 94 and are similarly connected and are controlled by a shifter rod 99. The rods 98 and 99 are controlled by a single operating lever 100 provided with the usual ball and socket joint 101. This lever 100 is adapted to be moved sideways in its neutral position to engage either of the rods 98 or 99 and then backward or forward to slide the gears. The rods 98 and 99 are located in their various positions by means of spring-pressed plungers engaging depressions in these rods as is customary in this type of sliding gear construction.

rThis change speed mechanism provides four different speeds of the shaft 93. In Fig. 12 of the drawings this mechanism is shown in the neutral position. A gear 102 is secured upon the rear end of the shaft 93 and meshes with a gear 103 similarly mounted upon a parallel shaft 104 extending from front to rear ofthe housing 60 and supported by bearings 105 therein. The rear ends of the

shafts

93 and 104 on which the

gears

102 and 103 are mounted extend through the rear wall of the housing 60 so that these gears can be readily interchanged or replaced by gears of different size and thereby vary the relative speeds of the

shafts

93 and 104. As shown, these gears are enclosed by a cover plate removably secured. to the housing.A Shaft 104 carries a worm 106 which meshes with a worm wheel 107 loosely mounted on the hub 108 of the clutch member 109. This clutch member 109 is revolubly mounted upon a transverse feed shaft 110 supported in suitable bea-rings 111 and carrying the feed pinion 59 that meshes with the rack 58 on the spindle sleeve. Bearings 112 are interposed between the clutch member 109 and the shaft 110. The gear 107 is provided with spring-pressed pawls 107 which are adapted to engage the ratchet 107 formed on the clutch member 109.

A clutch member 113 is ysplined upon the shaft 110 and is adapted to be moved thereon into and out of engagement with the clutch member 109 by an operating lever 114 provided with a handle 115 for manual operation. The lever 114 is pivotally mounted at 116 and is provided with an extension 117 which engages at its rear end a clutch member 118. The clutch members 113 and 118 are disposed on opposite sides of the pivotal mounting of the lever 114 so that both cannot be in engagement at the same time. The clutch member 118 is splined upon a transverse shaft 119 supported in suitable bearings in the rear portion of the feed box 60. A worm gear 120 is secured upon a sleeve 121 which is revolubly mounted on a bushing 122 on `the shaft 119. Clutch teeth 123 are formed on the hub of the gear to engage with the `corresponding teeth on the clutch member 118. Clutch teeth 124 aresimilarly 'torme'don the sleeve 121 to engage corresponding teeth on a sleeve 125 loosely mounted on the shaft 119. The worm gear 120 is constantly in mesh with a worm 126 on the shaft 75 (Figs. 6 and 9).

A gear 127 is secured upon the sleeve 125 and is permanently in mesh with a gear 126 `keyed to the loose sleeve or hub 108 on the feed shaft 110. A gear 129 is 4secured upon shaft 119 and is permanently in mesh with an idler gear 13() on the shaft 131. The idler gear 139 is similarly inl mesh with the Jfeed pinion59 on the shaft 110 and which pinion engages the rack 58 on the spindle sleeve 26.

mechanism for converting the revolving motion of the operating shaft 7 5 into the three diierent functioning movements of the spindle, namely, the drilling feed, the rapid upward return of the spindle kand the rapid downward approach of the spindle toward the work. The method of operation et this mechanism will be` described fully hereinafter. y The remaining portion of the mechanism provides the automatic action of the machine.`

. The lever 114 is engaged near its outer end by a longitudinally slidable plunger 140 `which is supported in a boX 60 secured to the lforward portion of the guiding head 27 and thehousing 60. This plunger carries adjusting screws 141 which act on opposite `sides of the pin 142 projecting downwardly :trom the lever 114 and connected thereto `(Fig. 6). A latch 143 (Fig. 7) is pivotally `mounted in this plunger 146 on the stud bolt 144. One end of this latch 143 is notched to receive the nose of the spring-pressed plunger 145 which tends to turn the latch in right hand direction. rllhe forward corner 146 of `the shoulder 150 `when engaged the lower end of a pin 153 von this bar. Rael( bar167 slides vertically in a guideway in the cover plateof boi; 66 and the

pins

152 and 153 are `adjustably mounted in inwardly `offset end portionsthereof. The upper and lower trips or stop

screws

64 and 65 are arranged to engage the projecting ends of these pins near ifi theends of the working and return strokes The description thus far relates to the of the drill spindle and thereby shift the racl; bar 167. yllhe plunger 140 is provided with laterally projecting lugsl54 and 155V which form sleeves respectively fitting about

hushings

156 and 157 upon the longitudinally slidable rod 158 disposedparallel with the plunger 140. The

bushings

156 and 157 are the outer end or' the shaft 164 to permit manual actuation of this shaft.

A stoo ein `169 has been provided to permit L l i. i. the movement el' the plunger 140 toward the right to he intercepted when this plunger has reached neutral position. 11 pin `170 normally engages notch 171 in the outer end of the sleeve 172 to maintain this stop pin in its withdrawn. or inoperative position? hut is adapted to he brought into registration with a deep 173 in this sleeve and thus permit the stop to. be moved inwardly under the action of the spring 174. 1n its inner positiong the stop pin 169 is disposed in the path of an adjustable screw 175 on the plunger 140.

Rapid approach of the spindle toward the work is provided by a mechanism controlled by an operating handle (Figs. 2 and 3) which is pivotally mounted on the shaft 186 on the outside ot the head 27.VA f1; spring- 'pressed aiunger 167 is ada ated to envase the n f3 O nose of stud 186 on the lever 185` to yieldingly maintain thislever in either its operative or inoperative position. in arm 189 is secured. upon the shaft 186 and projects in substantially the opposite direction from the lever 185. .4r pin 190 projects rearwardly from the lower end of this arm and is adapted to be engaged by an adjustable dog 191 Yon a bar 192. This bar is supported

extensions

192 and 192 on the adjustable coilars or

brackets

62 and 63 on the spindle les sleeve 26 and shirts vertically therewith.

The dog 191 is adjustable in a slot 193 in the bar 192 and is secured in its adjusted position by means `oi: the clamping bolt 194. ,.11 cam stud 195 mounted on `the part 192 has an inclined face 196 which engages the pin 190 at the end oi the up stroke of the spindle and automatically throws the lever 185 to the rigjnt7 causing the stud 168 to ride over the plunger 187. It it is desired that the rapid approach should not be thrown in automatically the cam stud 195 may be rotated by means of the lrnurled head 197 so that the pin 190 will pass downwardly in the cutaway portion 198 or this stud and the l neutral position.

lever 185 will not be tripped. The shaft 186 carries a pinion 199 (Fig. 3) which engages a rack 200 on the slidable control rod 201. The rod 201 is provided with a fork 202 (Figs. 6 and 9) which controls the movement of the sleeve 125 on which is mounted the gear 127.

A safety device has been provided to automatically release the spindle from the rapid approach mechanism in case abnormal resistance is encountered by the tool. The worm 126 (Fig. 9) is free upon the shaft 75 and is provided at its upper end with clutch teeth 220, preferably of the fan type, to engage corresponding teeth on the lower end of a sleeve 221 secured upon this shaft. A helical spring 222 envelops the shaft and yieldingly presses against the lowerend of the gear 126 to normally force these teeth into engagement and thus cause the gear to be driven by the shaft. Abnormal resistance to the operation of the rapid approach mechanism will cause the worm 126 to be released from the sleeve 221. This automatically throws out the quick approach mechanism and the feed of the spindle is taken up through the shaft 110 by means of the pawls 107 with the ratchet 107".

A shaft 203 (Fig. 3) is provided on the guiding head 27 to raise and lower it upon the column. `One end of this shaft is provided with a hexagonal head 204 which is adapted to be engaged by a wrench or other suitable tool to rotate the shaft. On the opposite end of this shaft is a helical pinion 205 which meshes with a helical gear 206 on the shaft 207 so that a rotation of the shaft 203 causes a corresponding rotation of the shaft 207. A gear 208 (Fig. 6) on the shaft` 207 engages the usual rack 209 on the column 20. While the

gears

205 and 206 are selflocking, the usual clamp bolts 210 are provided for rigidly securing the head in adjusted position.

In the operation of the machine the spindle 22 is driven by the belt 31 from the driving shaft 29. The pulley 30 is adjusted to bring the proper step for the desired spindle speed in line with the belt 31 and the carriage 34 is movedlongitudinally ofthe column eX tension 37 by either of the hand wheels 4l or 42 to provide the proper tension on the belt. The

idlers

32 and 33 may be angularly adjusted to provide the proper tracking of the belt. l

The rotation of the spindle causes a corresponding rotation of the shaft 7 5v through the action of the

gears

78, 79 and 80. The shaft 87 is constantly rotated by the shaft 7 5 through the medium of the helical gears and 86. The shaft 93 is operatively connected to the shaft 87 by means of the sliding change speed gears controlled by the lever which provide four different speed ratios. The shaft 93 is idle when the lever is in its The worm shaft 104 is driven from the shaft 93 by the

gears

102 and 103 permanently in mesh. By interchanging the

gears

102 and 103 or by replacing them with gears of different size, as described, it is possible to obtain any number of feed ratios. The worin 106 on the shaft 104 is constantly in mesh with the work wheel 107 (Fig. 6) revolubly mounted upon the sleeve 108 of the clutch member 109. The clutch member 109 is driven by the Worm wheel 107 through the medium of the pawls 107 and the ratchet 107". The remaining portion of the spindle feed mechanism is idle when the lever 114 is in its neutral position as the clutch members 113 and 118 vare respectively out of engagement with the clutch members 109 and 123.

In order to provide the normal downward feed of the drill spindle, the handle 115 on the lever 114 is thrown to the right (Fig. 6), moving the clutch member 113 into engagement with the clutch member 109. This causes the shaft to be driven by the worm wheel 107 and thespindle is fed downwardly through the medium of the gear 59 and the rack T he downward movement ofthe drill spindle may be halted at any time by moving the lever 114 into its neutral position. The 'quick returnof the drill spindle to its raised position is accomplished by throwing the handle 115 of the lever 114 to the left and therebycausing the clutch 'member 118 to engage the clutch member 123 to connect the drill spindle 27 to the drive shaft 75 through the medium of the gears 126 and l 120, the shaft 119, the

gears

129, and 59, and the rack 58.

The rapid approach action of the spindle is accomplished by throwing the lever to the right (Fig. 2). This shifts the gear 127 to the left (Fig. 6) and causes it to be 0peratively connected to the gear 120 by the clutch teeth 124. The gear 127 is permanently in mesh with the gear 128 which is keyed to the clutch member 109. This clutch member will now be driven at a higher rate of speed than the worm wheel 107 and this is permittedy by the pawl and ratchet connection of the worm wheel and the clutch member,

lli)

and, if the clutch members 109 and 113 are i engaged the drill spindle will be fed downwardly at a more rapid rate than the normal feed. If now the lever 185 is thrown to the left, the gear 127 is released andthe spindle is fed at the normal rate by the pawls 107 and the ratchet 107".

Instead of manually controlling the operation of the parts to provide the various movements of the spindle in the manner described, the entire operation of the spindle including'the'rapid approach, normal drilling feed, and quick return, may bea'ccomplished automatically. Assuming that one of the gears on the shaft 87 is in mesh with a gear on the shaft93,thewor1n`wheel 107'revolves ii inove the rod 158 to the left.

`continuo,usly and the' ratchet pawls 167" transmit the motion to `the clutchy member 109.

lf now the lever 11a`is shifted to bring the clutch members 109 and 113 into engagement, the pinion 59 revolves'slowly and feeds the "spindle downwardly at asuitablespeed `for drilling. l'ifhen the clutch members 109and 113 are in engagement, the uppercorner of the latch 143 (Fig. 7 is in engagement with the shoulder 150 on `the plate 151.` This engagement of the latch retains the lever 114 `in the position to `provide this normaldrilling feed. As the spindle22 approaches the end of its working strolte, the stop 611, which h beenpreviously set, pushes down` the rack:

bai` 167 and the raclr. on this bar rotates theV pinion165. This causes the pinion 163v to This movement i of the rod158causes the collar 158` (Fig. 6)

to engage-the bushing 156 and move it to the left. The spring 161 forces the iiange `160 l on bushing 157against thelug 155 and is then compressed by the continued movement ofthe rod; fit the end of the working stroke, the spring 161 is fully compressedand at this pointthe adjustable pin 153 pushes the latch 1113 out of engagementwiththe shoulder on the plate 151, releasing the plunger 140. The spring 161 now throws the plunger to theV left, causing the lever 1111 to move the clutch member 113 out of engagement with the clutch member 109 and bringing the clutch member 118 into engagement with the gear 120. This movement stopped'the downward feed and engaged the quick return. `VVh'en the plunger 140 has been moved to the left in the manner described, the lower corner 14l6of the latch 143 comes into engagement with the shoulder 1417 on the plate 148 and the lever 114 is thus held in the position 'of quick return. y

The automatic Vshifting of the mechanism from quick return to normal downward feed is accomplished in substantially thesame f; manner as the shift from downward feed to `quick return.

A s the spindle moves upwardly the stop y in the braclet`63 comes intoengagement with the lower end of the rack bar 167 and causes this bar to be raised. The raising ofthe rack bar moves the rod 158 to the right. MA shoulder on the rod engages the bushing 157 and compresses the spring 161 toward-the right and a pressure in this `direction is exerted on the lug 154; of

the plunger 140 bythe flange 159 on the bushin 156.` When the raclr bar has reached the upper limit of its travel, the pin 152 trips the latch 111-3 from itsengagement with the shoulder 1117, permitting the plunger 14;() and lever 114lto be thrown `to the right under the action of the .spring 161. rlhis instantly throws the clutch member 118 out of engagement and reengages the clutch member113.

The `lever 11eL is "locked in its newvposition by the engagement of the latch with the shoulder 150on` the plate 151. This automatic reciprocation of the drill spindle will continue as long Vas the spring-pressed stop pin 169 is held out of operative position. `Thereciprocationof the spindle may be stopped at the end of the return movement by rotating` the pin 169 to bring the pin 17 9 into registration `with the slot 178. The spring 174; will now suming that the lever185 is in its left or inoperative position, and the spindle is apn preaching the end of its upward travel, the

inclined cam face 196 will engage pin 190 and move `the lever 185 to the right. At the limit A of upward travel the stud 188 will ride over the4 plunger 187 and the shaft 186will berotated sutiiciently tothrow the gear 127 into eiigagementwiththe gear 120. instantly the rapid approach movement ofthe spindle begins and continues until the `lever 185 is returned to normal position by the engagement o f the dog 191iwith the pin 190 in the down-` ward movement of this dog with the spindle. The dog 191 is usually adjusted on the bar 192 so thatthe disengagement of the rapid Yapproach takes place just previous to the engagement of the drill with the work. Upon the disengagement of the rapid approach, the

normal feed of the spindle automatically f commences and continues until terminated in the manner previouslys described. The rapid approach will be automatically reengagedat the end of each up stroke of the spindle as long as 'the cam stud 197 remains in the position `indicated in Fig. 2. It is noted that the movements of the lever 185 foru'engaging and disengagingthe Vquick approachA mechanism are completed by the spring `actuated plunger 187g "To stop` this automatic action the cam studismerelyfro-v `tated to. bring the cutaway portion 198 of the stud `in linewith the pin 190. In case the dog 191isnot properly adjusted to` throw out therapid approach before the tool engages the work, the safety mechanism previ- `ously described will preventydamageto the parts without stopping the machine orotherwise delaying thedrilling operation.

rfFrom the foregoing description it' willbe i readilyfevidentthat my improved drilling y machine is simple and duraloleinE construction andhighly efficient `in operation. "Positive mechanism has been provided for returning the spindleto its raised position after `a drilling operation has been completed. Mechanical means are included for producing a rapid approach of the spindle toward the work followedl by a normal rate of drilling feed. 'lhe means for shifting themechanism from rapid a roach to normal drilling feed is readily ad ustable. The machine is capable of either fu orsemi-automatic feed with or without the rapid approach action. A safety device is provided to automatically throw out the rapid approach mechanism and start the normal drilling feed of the spindle in case abnormal resistance is encountered by the tool as would be the case if the automatic disengagement of the rapid approach was incorrectly adjusted.v An improved spindle driving mechanism has been provided; which eliminates improper tracking of the belt and facilitwtes the adjustment of the belt on the stepped pulley. A sensitive drilling machine has been produced in which 'the spindle feed mechanism is entirelylocated in the head. The entire comtruction is easily adjusted and operated Y I am aware that many changes may be made in the form and arrangement of the various parts without departing from the spirit of my invention and I reserve the right to make all such as fairly fall within the scope of the following claims.

I claim as my invention:

1. In a drilling machine, the combination with the machine frame, drill spindle and spindle sleeve, of a vertically adjustable guiding head for the spindle sleeve mounted von the machine frame, a horizontal feed shaft journaled in said head and geared to said sleeve, a vertical drive shaftv geared to said spindle and extending into said head, a series of horizontal countershafts ournaled in said head and extending from front to rear thereof, worm gearingconnecting one of said countershafts to said feed shaft, worm gearing connecting, another of said countershafts to said drive shaft and adjustable change speed gearing connecting said countershafts. 2. In a drilling machine, the combination with a drill spindle and a vertically adjustable guiding head therefor, of power driven feed mechanism for the drill spindle comprising a vertical drive shaft geared at its upper end to said spindle and extending downwardly into said head, a horizontal feed vshaft journaled in said head and geared to Said spindle and change speed, working feed and quick return gear trains mounted in said vertically adjustable guidinghead and operativelyfeonnecting said horizontal feed shaft to the lower end of said vertical drive shaft.

3. `InV a drilling machine, the combination with t. vertical drill spindle, spindle sleeve and vertically adjustable guiding head for mid sleeve, of wer actuated feed mechani-l for the dri l spindle comprisinga vertical drive `shaft geared at its upper end to the spindle and extending downwardly into said head, a horizontal feed shaft journaled in said head and gea-red to said spindle sleeve, change speed, working feed and quick return gear trains mounted in said vertically adjustable guiding head and operatively connecting said feed shaft to the lower en'd of said vertical drive shaft, clutches interposed in said gear trains and stop devices connected to said sleeve for automatically and alternately engaging and disengaging said clutches at the ends of the working and return strokes of the spindle.

4. In a drilling machine, the combination with a drill spindle and a vertically adjustable guiding'head therefor, of power actuated spindle feed mechanism comprising a vertical drive shaftgeared at its upper end to the spindle and extending downwardly into said head, a horizontal feed shaft journaled in said head and geared to said spindle sleeve, working feed, quick approach and quick return gear trains arranged in said vertically adjustable guiding head and operatively connecting said horizontal feed shaft tothe lower end of said vertical drive shaft and a clutch interposed in each of said gear trains.

5. In a drilling machin-e, the combination with a drill spindle and spindle sleeve and a vertically adjustable guiding head for said sleeve, a horizontal feed shaft journaled in said head and geared to said sleeve, a vertical drive shaft geared at its upper end to said spindle and extending downwardly into said head, and speed change gearing interposed between said vertical drive shaft and said horizontal feed shaft and including a series of horizontal counter-shafts journaled in said head, two of said counter-shafts having ends projecting outside of said head and interchangeable gears mounted on and connectsaid projecting ends.

,6. In a drilling machine, the combination of a vertical drill spindle, of power actuated spindle feed mechanism comprising a horizontal feed shaft geared to said spindle, a parallel counter-shaft, quick approach and quick vreturn gear trains coi'mecting said shafts, a slow speed working feed gear train Y,

connected to said feed shaft, a common vertical feed shaft for operating said gear trains, separate clutches for said gear trains, a common shifter for said working feed and quick return clutch andr a separate shifter for said quick approach clutch.

7. In a drilling machine, the combination with a drill spindle, of feeding means for said spindle including ay drive shaft, work feed mechanism permanently geared to said shaft, rapid approachv mechanism, .means for connecting and disconnecting said rapid approach mechanisml and said' shaft, a clutch for-connecting both of said mechanisms to said fspindle, and means interposedi'n said ineofiso nism and said Work feed mechanism to said spindle, a second clutch memherfor connecting said quick return mechanism to said spindle, and a common shifter for controlling said clutch members.

9. ln a drii With a drill spin lle, of poiver actuated feeding means for said spindle, including rapid approach inechanisimwork feed mechanism, quick return inechanism, a clutch member for connecting both said rapid approach inechanism and said Work feed mechanism with said spindle, and a second clutch `member for operatively connecting said quick return inechanismto said spindle, said clutch members heine' coni'iected to ermit onl one inemy i c i `ber to he in operative position ata time.

`l0. ln a drilling machine, the comloin ation With a drill spindle, power actuated spindle `feed mechanism comprising working feed,

quick approachand quick return gear trains, saidiwrking feed gear train hai/ing an overrunning connection, separate clutches indi- ,o vi'dualto said quick approach and said quick return. gear trains, a clutch common to said working feed and said quick approach gear "trains, a shifter `connected to said common `clutch and to, said quick return clutch for alternately opening and closing the saine and an independent shifter Afor said individual `quick approach clutch.

i ll. Ina drilling machine, the combination with a drill spindle and spindle sleefye,V of power actuated spindle "lfeedmechanism coinprising' Working feed, quick approach and quick return gear trainasepai le clutches'in* dividual to said quick approacli and' quick vreturn gear trains, a clutch common tosc-id Working feed and said quick approach trains, said {Working feed gear train o `having an over-running connectiomstop deyices connected to said spindle sleeve'for altcrnatelyengaging and disengagiiig saidco1n- `nonclutchand `said quick return clutch at the ends of the Working and return strokes of thespindle, andV stop devicesconnectedto saidsleeve forengaging said quick approach clutch at the end ofthe return stroke and for dise-iigagingthe same at an intermediate `point inthe `,i'orking stroke fof the spindle. i l2. In a drilling machine, the combination i Withadrill spindle and a spindlesleeve, of Vpovveractuated speed mechanism comprising "Working feed,quickapproach andquick re-V turn gear trains`,`an over-runningconnection machine, the combinationV o gaging the same.

o le. In a drillingmachine, the combination with a drill spindle and a spindle sleeve, of

and said quick approach gear trains, stop devices connected to said spindle for alternately and automatically engagingand disengaging' said common clutch and said quick return clutch at the ends of the Working and return strokes of the spindle and for automatically `engaging said rapid approach clutch at the end of the return stroke and for disengaging l the latter at an intermediate point in the Working stroke, and means for arrestingthe operation of the feed mechanism at theend of the return stroke with said common and said quick return clutches openand said quick approach clutch closed. i

13. ln a drilling machine, the combination with a drill spindle, power actuated feed mechanism therefor, comprising Working feed, quick approach and quick return gear trains, separate clutches individual to said quick approach and said quick return gear trains, a third clutch common to said Working and said quick approach gear trains, said Working gear train having an over-running connection, a shifter connected to said com mon clutch and to said quick return clutch for alternately engaging and disengaging the same, a separate shifter for said individual quick approach clutch, actuating spring means and co-operating stop devices connected to said spindle for automaticallyT moving said first mentioned clutch shifter alternately in opposite directions at the ends of the Work- `ing' and return strokes and for moving the other of said Shifters in opposite directions at the end of the return stroke and at an interi110' said mechanisms to said spindle, a shifter lever for actuating said clutches, and a spring actuator plunger controlled hy the move ments of the spindle for automatically` actuating said lever. i,

l5. In a drilling machine, the combination with a drillspindle andspindle sleeve, "of

`iriarallel Work feedand quick return shafts disposed at right angles to the spindle sleeve and permanently7 geared thereto for moving the same `in opposite directions, operating gears loosely mounted on said shafts, separate "clutches on said shafts for connecting said `gears thereto and a common, manually operable shift lever pivotally mounted intermedi ate its ends and directly connected to said clutches for alternately` engagingand disenfeeding means for the spindle including parallel work feed and quick return shafts disposed at right angles to the spindle sleeve and permanently geared thereto to move the same and the spindle in opposite directions, drive gears loosely mounted on said shafts, separate work feed and quick return clutches for connecting said gears to the shafts, a common shift lever pivotally mounted intermediate its m ends and directly connected to said clutches for alternately opening and closing the same, and means connected to the drill spindle for automatically oscillating said lever in opposite directions at the ends of the working and v return strokes.

\ 17. In a drilling machine, the combination with a drill spindle, of feeding means therefor including parallel work feed and quick return shafts permanently connected to the .20 spindle to move the same in opposite directions, work feed and quick approach and return gears loosely mounted on said shafts, two clutches forconnectingthe work feed and uick return gears. to the shafts, a common ,25 s ift lever connected to said clutches for alternately opening and closing the same, and

a third independently movable clutch co-operating with said work feed clutch for connecting the quick approach gears to said shafts.

18. In a drilling machine, the combination with a drill s indle, of feeding means for said spindle inciilding a feed shaft geared to said spindle, work feed mechanism including an overrunning .connection and rapid approach mechanism including a yielding connection, means for simultaneously connecting both of said mechanism to said shaft, and power driven means for actuating said mechanisms..

19. In a drillingmachine, the combination with a drill spindle, of'a feed shaft geared to said spindle, mechanismV including a pawl and ratchet connection for effecting a working feed of said shaft, mechanism for effecting an accelerated feed of said shaft, power driven means for actuating said mechanisms, and means for automatically connecting both of said mechanisms to said feed shaft at the 50. end of the return stroke of the spindle.

20..In a drilling machine, the combination with aidrill spindle, of a feed shaft geared to said spindle, mechanism includingl a pawl and ratchet connection for eect-ing a working feed of said shaft, mechanism for effecting an accelerated feed of said shaft, means for automatically connecting both of said mechanisms to-said shaft at the end of the return stroke of .the spindle, and power C9 driven means for actuating said mechanisms. 21. In a drilling machine, thecombination with a drill spindle, of a .feed shaft geared to said spindle, mechanism including a pawl and ratchet connection for effecting 'a working feed of said shaft,.mechanism foreffecting an accelerated feed of said shaft, a single clutch for connecting both of said mechanisms to said shaft, and power driven means for actuating said mechanisms.

22. In a drilling machine, the combination with a drill spindle, of feeding means for said spindle including power actuated Work feed and rapid approach mechanisms, and means for automatically releasing said rapid approach mechanism and effecting the operation of said Work feed mechanism when excessive operative resistance is encountered by said spindle.

23. In a drilling machine, the combination with a drill spindle, of power-actuated feeding means therefor, the spindle comprising both working feed mechanism and rapid approach mechanism, said working feed mechanism including an over-running connection, means for connecting both of said mechanisms to the drill spindle at the same time, means for automatically releasing the rapid approach mechanism when excessive operative resist-ance is encountered by said spindle.

24. In a drilling machine, the combination with a drill spindle, of feeding means for said spindle including a power driven shaft, Work feed an-d rapid approach mechanisms actuated by said shaft, means for operatively connecting both of said mechanisms to said spindle and means for automatically releasing said rapid approach mechanism when eX- cessive operative resistance is encountered by the spindle.

25. In a drilling machine, the combination with a drill spindle, of feeding means for Said spindle including a power driven shaft, work feed and rapid approach mechanisms, means for operatively connecting both of said mechanisms to said spindle, means for releasing said rapid approach mechanism at a predetermined point in the working stroke of the spindle, and means for automatically releasing the same when excessive resistance is encountered by the spindle.

26. In a drilling machine, the combination with the drill spindle, of feeding means therefor comprising work feed mechanism includving an overrunning pawl and ratchet connection, rapid approach mechanism including a yielding clutch connection, a power driven shaft for actuating said mechanisms, means for connecting both mechanisms to the spindle at the beginning of the working stroke and means for automatically releasing said rapid approach mechanism at a predetermined point in the working stroke and the work feed mechanism at the end of such stroke.

27. In a drilling machine, the combination with a drill spindle, of feeding .means for said spindle including a power driven shaft, rapid approach mechanism and work feed mechanism actuated by said shaft, and means for automatically releasing said rapid ap- `proach mechanismfrom said shaft Without disengaging said work feed mechanism therefrom when excessive operative resistance is encountered by said shaft.

28. In a drilling machine, the combination with a drill spindle, of feeding means for said spindle including a power driven shaft, work feed mechanism permanently geared `to said shaft, rapid approach mechanism,

encountered by said rapid approach mechanism.

29. In a drilling machine, the combination with the drill spindle and guiding head therefor, of power actuated feed mechanism for effecting the working stroke of said spindle, a clutch for controlling said feed mechanism, a shifter for actuating said clutch, a spring for moving said shifter in opposite directions to engage and disengage said clutch, and means connected to the spindle for automatically control-ling the operation of said spring.

30. In a drilling machine, the combination with the drill spindle and guiding head therefor, of power actuated feed mechanism for effecting the working stroke of said spindle, a clutch for controlling said feed mechanism, a shifter for actuating said clutch, spring actuated mechanism for moving said shifter in opposite directions to` engage and disengage said clutch, latch mechanism for holding said clutch in either its engaged or disengaged position, and means connected to said spindle for storing power in said spring actuated mechanism during the working and return strokes and fortripping said latch mechanism at the ends of such strokes.

and automatic means connected to said spindle for actuating said shifting means and tripping said latching means at the ends of the working and return strokes.

32. In a drilling machine, the combination 'with the drill spindle and guiding head therefor, of power actuated feed mechanism for eecting the working stroke of said spindle, a clutch for controlling said feed mechanism, a shifter for actuating said clutch, spring actuated mechanism for moving said shifter to engage and disengage said clutch, latch mechanism for holding said clutch in either its engaged orV disengaged position, and devices movable with said spindle for storing power in said spring means duiing the working and return strokes and tripping said latchiiig means at the ends of said strokes.

33. In a drilling machine, the combinationwith a drill spindle and guiding head therefor, ofpower actuated means for effecting the working and return strokes of said spindle, two controlling clutches there-` for, a shifter for actuating said clutches, spring means for actuating `said shifter to successively engage said clutches, and means for halting the travel of said shifter in an intermediate.position to retain both of said clutches out of engagement.

34. In a drilling machine, the combination with a drill spindle and guiding head therefor, of power actuated means for effecting the working and return strokes of said spindle, two controlling clutches therefor, a shifter for actuating said clutches,`

spring means for actuating said shifter to successively engage said clutches, and means for interrupting the actuation of said spring means to retain both of said clutches out of engagement.

35. In a drilling machine, the combination with a drill spindle, feeding means therefor including rapid approach mechanism and working feed mechanism, and means controlled by the movements of the drill spindle for automatically connecting both the rapid approach mechanism and the `working feed mechanism to the drill spindle at the end of the return stroke and for automatically and successively disconnecting the same during and at the end respectively of the forward stroke.

36. In combination in a drilling machine, a drill spindle, power actuated, feeding mechanism for effecting the forward and return strokes of said spindle, separate controlling clutches therefor, spring actuated means for alternately engaging said clutches at the ends of the forward and return strokes, devices `movable with the drill spindle for energizing and automatically controlling the operation of said spring-actuated means, and a stop device for arresting the operation of said feeding mechanism at the end of the return str-oke with said clutches in open condition, said spring means serving to close the forward clutch when said stop device is released.

` JAMES F. MIRRIELEES.

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