US1767752A

US1767752A - Feed mechanism for drilling machines

Info

Publication number: US1767752A
Application number: US700525A
Authority: US
Inventors: Friedl Joseph
Original assignee: AVEY DRILLING MACHINE Co
Current assignee: AVEY DRILLING MACHINE Co
Priority date: 1924-03-20
Filing date: 1924-03-20
Publication date: 1930-06-24
Anticipated expiration: 1947-06-24

Description

June 24, 1930. J, FRIEDL I 1, 7

' .FEED MECHANISM FOR DRILLING MACHINES Filed march 20, 1924 4 Sheets-Sheet 1 MW ufoagvfil'eci June 24, 1930. J. FRIEDL 1,767,752

FEED MECHANISM FOR DRILLING MACHINES Filed March 20, 1924 4 Sheets- Sheet 2 IIIIJ June 24, 1930. Y J. FRIEDL 1,767,7 2.

FEED MECHANISM FOR DRILLING MACHINES Filed Mai'ch 20 1924 4Sheets-Sheet a F 44 95 i {*j' a;

i v 4] r w Z5 1 J 5- 49 June 24; 1930. J. FRIEDL 1,767,752

FEED MECHANISM FOR DRILLING MACHINES Filed March 20, 1924 4 Sheets-Sheet 4 Patented June 24, 1930 warren STATES PATENT @FFEQE JOSEPH FRIEDL, OF COVING'ION, KENTUCKY, ASSIGNOR TO THE AVEY DRILLING MACHINE COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO FEED MECHANISM FOR DRILLING MACHINES Application filed March 20, 1924. Serial No. 700,525.

The invention seeks to provide an improved feed mechanism for drilling machines, and with which the feed of the drill spindle can be effected either by hand or by power, means being provided for controlling the power feed automatically or in whole or in part by hand, and means being also provided to permit the engagement and disengagementof the power feed mechanism and the quick approach and return movements of the drill spindle by the usual hand feed lever.

The invention consists in the features of improvement hereinafter set forth, illustrated in the preferred form in the accompanying drawings, and more particularly pointed out in the appended claims.

In the drawings:

Fig. 1 is a side elevation of a drilling machine with the present improved feed mechanism applied thereto.

Fig. 2 is a side elevation on an enlarged scale of the guiding head for the drill spindle and parts supported thereby.

Fig. 3 is a view of parts shown in Fig. 2

but in shifted position.

F i 4 is a horizontal section on the line 44.- of Fig. 2. I

Figs. 5, 6 and 7 are vertical sections on the lines 5-5, 6-6 and 77 respectively of Fig. 4.

Fig. 8 is a detail section on line 8-8 of Figs. 5 and 7.

The vertical drill spindle 10 is rotatably journaled in the usual manner in a supporting sleeve 11 which is vertically movable through a guiding head 12, the latter being adjustably clamped in position upon the front face of a hollow standard 13. The upper end of the spindle is vertically movable 43 through bearings 14 on the upper end of the standard and is keyed to a pulley 15 arranged between the bearings. A belt 16 passes over the pulley 15 and over guide pulleys 17 which serve to connect the drill spindle with asuitable driving counter shaft (not shown). A

counter balance 18 arranged within the hollow standard 13 is connected to one end of a chain 19. The latter extends upwardly and outwardly over guide rollers 20 and is connected to an arm or lever 21 which is pivoted at its outer end to the upper end of the spindle supporting sleeve 11. The inner end of the lever 21 is connected to a link 22 and the lower end of the latter is pivotally mounted on the guiding head 12.

The guiding head12, as most clearly shown in Fig. 1%., is hollow and is provided at one side with an integral gear casing 23 closed by cover plate 24:. The usual transverse feed shaft 25 is journaled in the guiding head and in the cover plate 24. A pinion 26 on the feed shaft engages a rack 27 on the spindle sleeve 11 and means is provided for effecting the rotation of the feed shaft either by power or by hand.

For effecting the power feed, a vertical drive shaft 28 is journaled in the rear por-. tion of the gear casing 23 and carries a worm 29 which meshes with a worm wheel 30 loosely mounted upon the feed shaft and adapted to be connected thereto as hereinafter described. The worm shaft 28 extends upwardly from .the guiding head through a bearing 31 and a gear casing 32, both of which are mounted upon the upper end of the standard 13. Intermeshing gears 33 in the gear casing 32 connect the worm shaft 28 with a stepped cone pulley 34% mounted upon a short vertical stud shaft 35. A belt 36 connects the pulley 34 with a stepped cone pulley 37 on the drill spindle 10. By the connections described the worm 29 and Worm wheel 30 are continuously rotated when the machine is in operation. The worm shaft 28 is keyed to rotate with one of the gears 33 but is free to move vertically relative thereto when the position of the guiding head 12 is adjusted.

The worm wheel is connected to the feed shaft 25 through an over running connection IUD a flange 41 thereon and a clutch disc 42 which is threaded onto a section of the feed shaft. The hub of the worm wheel is loosely mounted upon the sleeve 40 between the ratchet 38 and a clutch member 43 threaded on the outer end of the sleeve. The clutch disc 42 has radially projecting arms 44 (see Figs. 4 ant 7) which are provided with guides fora pair of radially movable dogs 45. The latter are provided with beveled inner ends which are adapted to be shifted into and out of engagement with the beveled saw teeth of the clutch member 43 to thereby connect and disconnect the clutch members '42 and 43; When the clutch members are connected the shaft is driven from the worm wheel through the medium of the clutch members and the over running connection comprising the ratchet 38 and pawls 39. In this way the working feed of the drill spindle can'be effected by power. By changing the belt 36 upon the stepped cone pulleys 34 and37, the speed of the work feed can be varied.

Springs 46arranged in sockets in the arms 44 of the clutch disc 42 tend to shift the clutch dogs outwardly to their disengaged positions. The dogs are shifted against the tension of the springs into engaged positions and are held in such positions by a pair of cam lugs 47 fixed to a rotatable clutch controller or shifter. This clutch controller or shifter is in the form of a disc 48 having an elongated hub 49 loosely mounted on the reduced outer end of the feed shaft 25 and extending outwardly througha bearing in the gear case cover 24. The edge of the controller disc 48 has an inturned flange 50 upon which the cams or shoes 47 are mounted. The clutch controlling disc has a lost motion connection with the clutch member 42 and the feed shaft 25 to which this clutch member is fixed. This connection comprises two pins 51 (see Fig. 7) fixed to the controller disc or shifter 48 and which are arranged to alternatelyengage one of the arms 44 and another arm 52 formed upon the clutch member 42. The pins 51 are so disposed with respect to the

arms

44 and 52 that the clutch controlling disc 48 may move to a limited extent relatively to the clutch member 42 to thereby move the cam lugs 47 into and out of engagement with the dogs 45 and thereby engage and dis engage the clutch members and throw the power feed mechanism into and out of operation. This limited relative movement of the clutch controller 48 is indicated by full and dotted lines in 7. A spring-pressed pin 53 on the arm 52 is arranged to engage the recess in a third camlug or shoe 54 fixed to the flange 50 of the clutch controller, and these parts serve to hold the clutch controller or shifter against accidental relative movement.

A sleeve 55 (see Fig. 4) is keyed to the outer projecting hub or sleeve 49 on the clutch controlling or shifting disc 48 and is connected to a hand feed lever comprising a hub 56 and arms 57. Preferably the hand feed lever is detachably connected to the sleeve 55 and for this purpose the hub 56 is loosely mounted on a toothed or notched portion 58 of the sleeve between a flange thereon and a collar threaded on the end of the sleeve 49, and one of the arms 57 is radially movable to a slight eXtentso that its inner end may be moved into and out of locking engagement with the toothed portion 58 of the sleeve. The movable arm 57 extends within a socket 59 on the hub 56 and a spring 60 within the socket tends to force the arm inwardly. A cross pin 61 carried by the arm can, by rotating the latter, be brought into line with deep and shallow notches in the end of the socket. When the pin 61 is in line with the deep notches the spring 60 will hold the hand feed lever interlocked with the clutch controlling disc 48, but vby withdrawing the movable arm 57 of the feed lever against the tension of the spring 60, it can be rotated to engage the pin 61 with the shallow notches and thereby hold the hand feed lever disengaged from the clutch controller or shifter.

When the hand lever is interlocked with the.

clutch controlling disc 48, it can be employed to shift the latter relatively to the clutch member 42 to thereby engage and disengage the clutch and throw the power feed mechanism into and out of operation. The hand lever may also be employed to effect the quick approach and return movements of tie drill spindle to and from the work. Thus, if the clutch controlling disc 48 is in its retracted position relatively to the clutch member. 42 with the cam lugs 47 thereon in the position indicated in dotted lines in Fig. 7, the clutch dogs 45 will be held outwardly or in disengaged position by the springs 46. Then by shifting the hand lever and clutch controller forwardly in the direction indicated by the arrow in Fig. 7, the cam lugs 47 will force the clutch dogs 45 inwardly against the tension of the springs 46 and thereby engage the power feed mechanism. By continuing the movement of the hand lever in the same direction, the quick approach of the drill spindle to its work may be effected even though the power feed is engaged, since the clutch members are connected to the worm wheel 30 by the over running connection comprisin the ratchet 38 and pawls 39. A slight movement of the hand lever in the opposite direction will shift the clutch controlling disc backwardly relatively to the clutch members,

and the springs 46 will then shift the clutch dogs 45 outwardly and disengage the power feed. The continued backward movement of the feed lever will effect the return of the drill spindle as far as may be required. It will thus be seen that a forward movement of the hand feed lever engages the power feed and effects the rapid approach of the drill spindle, and that a backward movement of the hand lever disengages the power feed and returns the drill spindle.

Means are provided for rendering the hand feed lever ineffective to engage the power feed. For this purpose the clutch member 42 that is fixed to the feed shaft is provided with a projection 62 which carries a pivoted latch or dog 63. The latter projects outwardly through an opening 64 in the clutch controlling disc 48 and which opening is provided with a notch or seat 65 in its edge and into which the latch may be shifted, as shown in full lines in Fig. 8, when the clutch-controlling disc 48 is in its retracted position and the clutch dogs 45 disengaged. VJ hen the controlling disc 48 and clutch member 42 are thus locked against relative movement, the hand lever and the controlling disc are no longer effective to engage the power feed but the hand lever is then operative to rotate the feed shaft 25 and so manually effect the working and return strokes of the drill spindle. A spring 66 is provided, as shown in 8,forholdingthelatch 63 either in its engaged or disengaged position and an opening 67 is provided in the gear case cover plate 24 so that the operator may conveniently position this latch as desired.

Means are also provided for actuating the clutch controlling disc or shifter 48 to there by automatically engage and disengage the power feed mechanism. The automatic clutch engaging means is mounted in a supplemental box or casing 68 on the forward portion of the gear case 23 and is controlled by trip devices on a collar 69 that is clamped on the lower end of the spindle sleeve 11. An arm or dog 70 mounted on a short shaft 71 in the boX 68 is arranged to project into the forward portion of the gear casing 23 and cooperate with a pin or lug 72 on the periphery of the clutch controlling disc 48. A pinion 73 on the shaft 71 meshes with a gear 7 4 on a second shaft 7 5 ournaled in the box 68. This shaft is adapted to be actuated in one direction by a coiled spring 76 and a pawl 77 cooperates with a ratchet 78 on the shaft to hold the spring under tension with the dog 70 in the position shown in dotted lines in Fig. 2, and in full lines in Fig. 7. The pawl 77 is fixed to a springheld arm or lever 7 9 pivoted on the underside of the box 68 and projects upwardly therefrom through an opening in the box. An offset projection 80 on the collar 69 carries a vertical pin 81 having a pivoted spring-held pawl 82 at its upper end which is arranged to project through an opening in the bottom of the box 68. As the drill spindle and sleeve move downwardly from the position incli- -cated in Fig. 3 to that shown in Fig. 2, or in other words, at the beginning of the down stroke of the drill spindle, the pawl 82 cooperates with the ratchet wheel 7 8 to wind up the spring 7 6 and shift the dog 70 from the position shown in Fig. 3 to that shown in Fig. 2. At the end of the return stroke of the spindle, an abutment 83 eccentrically mounted on the pin 81 will strike the inner end of the lever 79 and trip the holding pawl 77. Spring 76 will then actuate the dog 70 and the latter, by engaging the pin 72 thereon, will move the clutch controlling disc 48 and engage the power feed clutch. The pin 81 has a knurled collar on its lower end so that it may be rotated through 180 to throw the pawl 82 and abutment 83 thereon into their inoperative positions, as indicated in dotted lines in Fig. 2. A spring pressed ball 84 cooperates with recesses in he pin 81 to hold the parts thereon either in their operative or inoperative positions.

To automatically open the clutch and disengage the power feed. the sleeve 55 that is keyed to the clutch shifter is provided with a pinion 85 (see Fi s. 4 and 5) which meshes with a vertical rack bar 86. The latter is mounted to slide in guides 87 and 88 on the cover plate 24. A sleeve 89 adjustably clamped on. the upper portion of the rack bar 86 has a stop collar 90 adjustably threaded thereon and held in adjusted position by a lock nut 91. The sleeve 89 and stop collar 90 can be adjusted in accordance with the desired length of the working stroke of the spindle. The rack bar 86 and stop collar 90 of course shift with the clutch disc 48 during the working stroke of the drill spindle. At the end of the working stroke, stop collar 90 will engage a lug 92 on the upper end of the guide 88 and so arrest the movement of the rack bar and the clutch controlling disc 48. The continued forward movement of the clutch members will disengage the dogs 45 from the cam lugs 47 so that the dogs will be shifted outwardly by the springs 46 to thereby throw the power feed-out of operation.

The operation of the improved feed mechanism may be briefly summarized as follows:

For feeding the drill spindle entirely by hand, the latch 63 is positioned as shown in full lines in F ig. 8, to lock the disc 48 against movement relative to the clutch member 42 and feed shaft 26. The power feed can not then be engaged, but the hand feed lever can be used in the usual manner to reciprocate the drill spindle. For semi-automatic operation, the latch 63 is shifted to the position shown in dotted lines in Fig. 8, so

Will .quickly advance the drill to its work at which point the power mechanism will effect the working feed of the drill. At any time, if desired, a slight relative backward movement of the hand lever will disengage the power feed and effect the return movement of the drill. At the end of the working stroke, the stop 90 will engage the lug 92, arrest the rack bar 86 and clutch controlling disc 48 to thereby open the clutch and disengage the power feed. The dill spindle will then be automatically returned to initial position by the counter balance 18.

For full automatic feed, the pin 81 and parts thereon will be adjusted to the position shown in full lines in Fig. 2. Then as described, the dog will be retracted and its actuating spring 76 wound up during the beginning of the down stroke of the spindle. At the end of the working stroke the power feed will be disengaged as above described and the spindle returned by the counterweight, and, at the end of the return stroke, the abutment 88 will trip the pawl 7'? and the dog 70 will be actuated by its spring to move the clutch shifter disc 48 re rtively to the clutch members and engage the clutch. This operation will continue until the pawl 82 and abutment 83 are shifted to their inoperative position. The power feed can be engaged by hand at the end of the return stroke of the spindle by manually depressing the lever 7 9. Preferably during the full automatic operation the hand feed lever is disengaged.

A short shaft 93 (see Figs. 2 and 4) is iournaled in the guiding head in rear of the feed shaft 25 and this shaft carries a cam .94 and a gear 95, the latter meshing with the feed shaft pinion 2-6. A vertical sleeve 96 is fixed to the guiding head and a plunger 97 guided in the sleeve is pressed into engagement with the cam 9% by a spring 98. This spring is coiled about the stem of the plunger and its tension can he adjusted by a cap 99 threaded upon the sleeve 96 and engaging the upper end of the spring. The gear 95 and the cam 9 L rotate as the drill spindle is reciprocated and the parts are so arranged that the spring 98 moves the plunger 97 downwardly during the working stroke of the drill spindle and, during the return stroke, the cam forces the plunger upwardly against the pressure of the spring. By adwa-rdly against the pressure of the spring. By adjusting the pressure of the spring the operation of the counterweight 18 during the return stroke of the spindle can be controlled as desired.

Obviously changes may be made in the details set forth without departure from the essentials of the invention as defined in the claims.

I claim as my invention:

1. In a drilling machine, the combination with a drill spindle, of a power feed mechanism for the'spindle including driving and driving members adapted to be connected and disconnected to throw the power feed mechanism into and out of operation and an overrunning connection permitting the quick approach of the spindle when said members are operatively connected, a hand feed lever and means actuated by the movement of said lever in one direction for successively operatively connecting said driving and driven members and eilectiug the quick approach or the spindle.

2. In a drilling machine, the combination with a drill spindle, of a power feed mechanism therefor including driving and driven members adapted to be connected and disconnected to throw the power feed mechanism into and out of operation and an overrunning connection permitting the quick approach of the spindle when said members are driving and driven members adapted to be connected and disconnected to throw the power feed mechanism into and out of .operation and an over-running connection permitting the quick approach of the spindle when said members are operatively connected, a shifter actuated by the movement of the hand lever in opposite directions for connecting and disconnecting saiddriving and driven members and foreffecting the quickapproach and return movements of the spindle, and means for rendering the shifter ineffective to connect said members and permit the full manual control'of the spindle by said lever.

4. In a drilling machine, the combination with a drill spindle, of a hand feed lever for manually reciprocating the spindle, power feed mechanism for the spindle including toothed driving and driven coupling members adapted to be operatively. connected and disconnected to throw thepower feed mechanism into and out of operation, a shifter manually operable by the hand feed lever for connecting and disconnecting said toothed coupling members, stop and start de vices controlled by the movement of the spindie for automati ally operating said shifter to connect and disconnect the toothed'driving and driven member at the ends of the return and working strokes respectively of the spindle, and means for rendering said'shifter ineffective to operatively connect said members and permit the full manual control of the spindle by said hand lever.

5. In a drilling machlne, the combination with a drill spindle, of a hand feed lever for manually reciprocatin the spindle, a power feed mechanism for the spindle including co operating clutch members adapted to be engaged and disengaged to throw the power feed mechanism into and out of operation, and an over-running connection permitting the quick approach of the spindle when said clutch members are operatively connected, a shifter actuated by the movements of the hand lever in opposite directions for effecting the engagement and disengagement of said clutch members and the quick approach and return movements of the spindle, and stop and start devices controlled by the movement of the spindle for automatically engaging and disengaging said clutch members at the ends of the working and return strokes respectively, said start device being adjustable into and out of operative condition.

6. In a drilling machine, the combination with a drill spindle, of a feed shaft geared thereto, a hand lever and a power drive shaft, both operative to rotate said feed shaft, said hand lever having a limited, lost mot-ion connection with the feed shaft and said drive shaft having both a coupling connection with the feed shaft and also an over-running connection therewith permitting the quick approach of the spindle when the coupling connection is made, and means actuated by the movement of the hand lever in one direction to successively make said coupling connection and effect the quick approach of the spindle, and by its movement in the opposite direction to successively break the coupling connection and effect the quick return move ment of the spindle.

7. In a drilling machine, the combination with the drill spindle, of a feed shaft geared thereto, a hand feed lever having a limited relative movement connection with said shaft to rotate the same, a power drive for said shaft, including a clutch and an over-running connection to permit the quick approach of the spindle when the clutch is closed, and means independent of said connection and actuated by the limited relative movement of said lever for closing and opening said clutch.

8. in a drilling machine, the combination with a drill spindle, of a feed shaft geared thereto, a hand feed lever having a limited, relative movement connection with said shaft to rotate the same,a power drive for said shaft including a clutch and an over-running connection permitting the quick approach of the spindle when the clutch'is closed, means controlled by the limited relative movement of the feed lever for opening and closing said clutch and means for locking said lever against relative movement to render the same ineffective to close said. clutch.

9. In a drilling machine, the combination with a drill spindle, of a feed shaft geared to said spindle, a power drive for said shaft, a shifter having a limited, relative movement connection with said shaft for rotating the same, means controlled by the limited, relative movement of the shifter for connecting and disconnecting the power drive and said feed shaft, a hand lever operatively connected to said shifter, a stop device for arresting said shifter to automatically disconnect the power drive at the end of the working stroke, a movable member mounted on the machine frame for operating said shifter to connect the power drive at the end of the return stroke of the spindle, and means for locking said shifter against relative movement to prevent the connection of the power drive to the spindle and permit the full manual control of the spindle by said hand lever.

10. In a drilling machine, the combination with a drill spindle, of a feed shaft geared to said spindle, a power actuated shaft, driving and driven members for connecting and disconnecting said shafts, an over-running connection between said power actuated shaft and said driving member, permitting the quick approach of the spindle when said members are connected, a shifter having a limited relative movement connection with said shaft for rotating the same and means controlled by the limited relative movement of the shifter for connecting and disconnecting said driving and driven members. 7

11. In a drilling machine, the combination with a drill spindle, of a feed shaft geared to said spindle, a power actuated shaft, driving and driven members for connecting and disconnecting said shafts, an over-running connection between said power actuated shaft and said driving member, permitting the quick approach of the spindle when said members are connected, a shifter having a limited relative movement connection with said shaft for rotating the same, means controlled by the limited relative movement of the shifter for connecting and disconnecting said driving and driven members, and stop and start devices for arresting and moving said shifter to automatically disconnect and connect the driving and driven members at the ends of the working and return strokes respectively. I

12. In a drilling machine, the combination with a drill spindle, of a feed shaft geared to said spindle, a power actuated shaft, driving and driven members for connecting and disconnecting said shafts, an over-running connection between said power actuatedv shaft and said driving member permittin the quick approach of the spindle when said members are connected, a shifter having a limited, relative movement connection with said shaft for rotating the same, means controlled by the limited relative movement of the shifter for connecting and disconnecting the driving and driven member, a feed lever movable in opposite directions for manually operating said shifter and effecting the quick ap proach and return movements of the spindle, stop and start devices for arresting and effecting the movement of said shifter to automatically disengage and engage said members at the ends of the working and return strokes respectively of the spindle, and means fordocking said shifter against relative movement to prevent the connection of said members, and permit the full manual operation of the spindle by said lever.

13. In a drilling machine, the combination with a drill spindle, of power feed for the spindle including a controlling clutch and an over-running connection permitting quick approach of the spindle when the clutch is closed, a shifter for opening and closing the clutch and a hand feed lever for operating said clutch shifter and for effecting the quick approach movement of the spindle.

i l. In a drilling machine, the combination with the drill spindle, of a feed s iaft therefor, a power drive for said shaft including a controlling clutch and an over-running connection, a shifter for rotating said shaft and having a limited movement relative thereto for opening and closing the clutch, a feed lever connected to said hifter for manually controlling the clutch and shifting the drill spindle, and means movable with the spindle for effecting the limited relative movement f the shifter to control the clutch automatically.

15. in drilling machine, the combination with the drill spindle, of afeed shaft therefor, a power drive for said shaft including a controlling clutch and an over-running con nection, shifter for rotating said shaft and having a limited movement relative thereto for opening and closing the clutch, feed lever con ected to said shifter for manually controllii the clutch and shifting the drill spindle, adjustable devices shiftable with the spindle for effecting the limited relative movemen of the shifter control the clutch automatically, and means for locking said shifter to the shaft to prevent the engagement of the clutch and permit the full man ual c ntrol of the spindle by said lever.

16. In a drilling machine, the combination with the drill spindle, of a feed shaft geared thereto, a power driven gear loose on the shaft, tight and loose clutch members on said shaft for connecting said gear thereto, a pawl and ratchet connection between said gear and said loose clutch member to permit the overrunniro, of said shaft when the clutch is en a e-a, and a shif r mounted on said shaft and havi a limited movement relative thereto for engaging and disengaging the clutch members and for manually effecting the quick approach of the spindle when the clutch members are engaged.

17. In a drilling machine, the combination with the drill spindle, of a feed shaft geared thereto, a power driven gear loose on the shaft, tight and loose clutch members on said shaft for connecting said gear thereto, a pawl and ratchet connection between said gear and said loose clutch member to permit the overrunning of said shaft when the clutch is engaged, a clutch shifter on said shaft and having a limited relative movement connection therewith, ust'able means movable with the spindle for effecting the limited relative movement of the shifter to control the clutch automatically, a feed lever connected to said shifter for manually controlling the clutch and effecting the quick approach and return movements of the spindle, and means for rendering said shifter inefiective to engage the clutch and permit the full manual control of the spindle by said lever.

18. in a drilling machine, the combination with the drill spindle, of a power feed for effecting the working stroke of the spindle, means for effect-ing its return stroke, con trolling clutch members for the power feed, a clutch shi 'ter rotatable with one of said member but s iiftable to a limited extent relative thereto for enaging and disengaging the clutch members, a rack geared to said clutch shifter and adjustable stop devices cooperating with said rack bar to arrest said shifter and thereby disengage the clutch members the end of the working stroke of the spindle.

19. In a drilling machine, the combination with the drill spindle, of a power feed for offecting the working stroke of the spindle,

means for effecting its return stroke, control ling clutch members for the power feed, spring means for disengaging said clutch members, a shifter rotatable with one of said members but shiftable to a limited extent relative thereto for engaging said members, stop devices for arresting said shifter at the end of the working stroke to permit the disengagement of said clutch members by said spring means, a second spring-actuated means for operating said shifter to engage said clutch members, anddevices automatically actuated by the movement of the spindle for storing energy in said second spring-actuated means and for tripping the same into operation at the end of the return stroke of the spindle.

20. In a drilling machine, the combination with the drill spindle, of a power feed for effecting the working stroke of the spindle, means for effecting its return stroke, controlling clutch members, for the power feed, a clutch shifter rotatable with one of said members but shiftable to a limited extent rela tive thereto for engaging and disengaging the clutchrmembers, adjustable stop devices ill) for arresting said shifter to disengage the clutch members at the end of the working stroke of the spindle, a sprin -actuated means for actuating said shifter to engage the clutch members, and devices connected to the spindle for storing energy. in said spring-actuated means and for tripping the same into operation at the end of the return stroke of the spindle.

21. In a drilling machine, the combination with a reciprocating drill spindle, of a power feed mechanism for efiecting the working stroke of the spindle, means for effecting its return stroke, a shifter having a limited, rel ative movement connection with the spindle to move back and forth therewith, stop and start devices cooperating with the shifter to effect the limited relative movement thereof at the ends of the working and return strokes respectively of the spindle, and means controlled by such movements of the shifter for throwing the power feed mechanism out of and into operation, said start device being mounted on the machine frame and movable to operate said shifter.

22. In a drilling machine, the combination with a drill spindle, of a feed shaft geared thereto, a power drive for said shaft, a shifter having a limited relative movement con nection with said shaft to rotate in opposite directions therewith, means controlled by the limited relative movements of the shifter for engaging and disengaging the power feed, a stop device for arresting said shifter at the end of the working stroke to thereby disengage the power feed and a start device, adjustable into and out of operative conddition and arran ed to coo crate with said shifter at the end of the return stroke to antomatically effect the power drive engaging movement thereof.

23. In a drilling machine, the combination with a drill spindle, of a feed shaft geared to the spindle, a power-actuated drive shaft, cooperating driving and driven connecting members, said driven member being connected to said feed shaft, an over-running connection between said power-actuated shaft and said driving member permitting the quick approach of the spindle when said members are connected, a shifter having a limited, relative movement connection with said feed shaft to rotate back and forth therewith, means controlled by the limited relative movement of the shifter for connecting and disconnecting said members and stop and start devices controlling said shifter to disengage and engage said members at the ends of the working and return strokes respectively of the spindle.

24. In a drilling machine, the combination with a drill spindle, of a power feed for effecting the working stroke of the spindle, means for effecting its return stroke, rotat able controlling clutch members for the power feed, spring means for disengaging said clutch members, a shifter rotatable with one of said members but movable to a limited extent relative thereto for engaging said members against the pressure of said spring means, stop devices for arresting said shifter at the end of the working stroke of the spindle to permit the disengagement of the clutch members by said spring means, and a spring actuated member for effecting the clutch engaging movement of said shifter at the end of the return stroke.

25. In a drilling machine, the combination with a drill spindle, of a power feed for effecting the working stroke of the spindle, means for effecting its return stroke, rotatable controlling clutch members for the power feed, a shifter rotatable with one of said clutch members but movable to a limited extent relative thereto for engaging and disengaging said members, stop devices for arresting said shifter at the end of the working stroke to automatically disengage said clutch members and a spring-actuated start device cooperating with said shifter atthe end of the return stroke to automatically effeet the clutch engaging movement thereof.

26. In a drilling machine, the combination with the drill spindle of a power feed for effecting the working stroke of the spindle, means for effecting its return stroke, rotatable driving and driven clutch members for controlling the power feed, spring actuated dogs on the driven clutch member for engaging the driving clutch member, a shifter rotatable with the driven clutch member and having a limited relative movement connec tion thereto, and cams effective upon its limited relative movement for engaging and disengaging said dogs, devices controlled by the movement of the drill spindle for automatically effecting the clutch engaging and disengaging movement of said shifter, and a hand lever connected to the shifter for effecting its clutch engaging and disengaging movements and also for manually reciprocating the drill spindle.

27. In a drilling machine, the combination with the drill spindle of a power feed for effecting the working stroke of the spindle, means for effecting its return stroke, rotatable driving and driven clutch members for controlling the power feed, spring actuated dogs on the driven clutch member for engaging the driving clutch member, a shifter rotatable with the driven clutch member and having a limited relative movement connection thereto, and cams effective upon its limited relative movement for engaging and disengaging said dogs, devices controlled by the movement of the drill spindle for automatically effecting the clutch engaging and disengaging movement of said shifter, a hand lever "connected to said shifter for effecting its clutch engaging and disengaging moveand spindle,

ments and for manually reciprocating said spindle and means for locking said shifter against movement relative to the driven clutch member to permit the full manual control of the spindle by said hand lever.

Y 28. In a drilling machine, the combination with a drill spindle, of feed mechanism for the spindle including a power-actuated shaft, driving and driven coupling members for connecting and disconnecting the shaft an over-running connection interposed between said shaft and of the spindle when the coupling members are engaged, a hand feed lever and means operated by the movement of said lever in one direction for successively connecting the driving and driven members and efiecting the quick approach of the spindle.

29. In a drilling machine, the combination with a drill spindle, of feed mechanism for the spin lle including a power-actuated shaft, driving and driven coupling members for connecting and disconnecting the shaft and spindle, an over-running connection interposed between said shaft and the driving member permitting the quick approach of the spindle when the coupling members are engaged, a hand feed lever having a limited, relative movement connection with the drill spindle for manually reciprocating the same, and means operated by the limited relative movement of the lever for connecting and disconnecting the driving and driven members.

30. In a drilling machine, the combination with a drill spindle, of feed mechanism for the spindle including a power-actuated shaft, driving and driven coupling members for connecting and disconnecting the shaft and spindle, an over-running connection interposed between said shaft and the driving member permitting the quick approach of the spindle when the coupling members are engaged, a shifter having a limited, relative movement connection with the driven member, means actuated by the limited movement of said shifter for engaging and disengaging said members, a stop device for arresting said shifter to disengage the members at the end of the working stroke and a part movably mounted on the machine frame for operating said shifter at the end of the return stroke to engage said members.

31. In a drilling machine the combination with a drill spindle, of feed mechanism for the spindle including a power-actuated shaft, driving and driven coupling members for connecting and disconnecting the shaft and spindle, an over-running connection interposed between said shaft and the driving engaged, a shifter having member permitting the quick approach of the spindle when the coupling members are a limited, relative movement connection with the driven memtlie driv mg member permitting the quick approach her for effecting the engagement and disengagement of said members, a feed lever connected to said shifter for manually operating the same and for manually shifting the drill spindle, stop and start devices for effect the limited relative movement of the to connect and disconnect said memstrokes respectively of the spindle, and means for locking the shifter to the driven member to pr vent the connection of said members and permitting the full manual control of the spindle by said lever.

In a drilling machine, the combination with a drill spindle, of a feed shaft for the said spindle, tight and loose clutch members on said shaft, a power-actuated member having an over-running connection with the loose clutch member to permit the quick approach of the spindle when said clutch members are engaged, a clutch shifter having a limited relative movement connection with said shaft to rotate therewith, means controlled by the limited relative movement of the shifter for connecting and disconnecting said tight and loose clutch members, and a hand feed lever for operating said shifter and for effecting the quick approach of the spindle.

In a drilling machine, the combination with drill spindle, of a feed shaft for said spindle, tight and loose clutch'members on said sh ft, a power-actuated member having an ove -running connection with the loose clutch member to permit the quick approach of the spindlewhen said clutch members are engaged, a clutch shifter having a limited relative movement connection with said shaft to rotate therewith, means controlled by the limited relative movement of the shifter for connecting and disconnecting said tight and loose clutch members, a hand feed lever for operating said clutch shifter and for effecting the quick approach moveient of the spindle, stop and start devices for automatically effecting the limited relative movements of the shifter at the ends of the working and return strokes of the spindle.

3a. In a drilling machine, the combination with a drill spindle, of a feed shaft for said spindle, tight and loose clutch members on said shaft, a power-actuated member having an over-running connection with the loose clutch member to permit the quick approach of the spindle when said clutch 'members are engaged, a clutch shifter having a limited relative movement connection with said shaft to rotate therewith, means controlled by the limited relative movement of the shifter for connecting and disconnecting said tight and looseclutch members, a hand feed lever for operating said clutch shifter and for efi'ec't ing the quick approach movement of the spindle, and stop andstart devices for autol/LG endsof the return and working JOSEPH FRIEDL.