US1748476A

US1748476A - Drilling-machine feed mechanism

Info

Publication number: US1748476A
Application number: US675033A
Authority: US
Inventors: Einar A Hanson
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-11-16
Filing date: 1923-11-16
Publication date: 1930-02-25
Anticipated expiration: 1947-02-25

Description

Fe; 2, "H I B, w, sgm 3,74%,47

I DRILLING MACHINE FEED MECHANISM Filed Nov. 16, 1923 7 Sheets-Sheet l J v I I gvvuvntoc ks w 3%h-25, 193$ B. M. w. HANSON 7 DRILLING MAGHiNE FEED MECHANISM Filed Nov.--\16, 1925 7 Sheets-Sheet 2 gwvenlo n 393$. B. M. w. HANSON 19.7 5

- DRILLING MACHINE FEED MECHANISM I Filed Nov. 16, 1923 7 Sheets-Sheet 4 I I 63 a I J J8 J9 .ma 0

I A o 86

r

3,2 36 a7 I 75 37 9p .94 3/ w a l as ll iz E gvmwmtoi Feb. 25, 1930. a. M. w. HANSON 1,748376 DRILLING momma FEED uzcnmsu 3 Filed Nov. 16, 1923 j 7 Sheets-Sheet 5 Feb. 25, 1930. f B. M. w. HANSON 1,748,476

DRILLING MACHINE FEED MECHANISM FiledNov. 1.6, 1925 7 Shets- Sheet' 7 Patented Fb. 25, 1930 UNITED STATES PATENT OFFICE BENG'J. M'. W. HANSON, OF. HARTFORD, CONNECTICUT; EINAIB, A. HANSON EXEOUTOB OF SAID BENGT M. W. HANSON, DECEASED DRILLING-MACHINE FEED MECHANISM Application filed November 16, 1923. Serial No. 675,Q38.

The present invention concerns metal working machines and has particular reference to machines, such as a drilling machine, for forming holes.

The aim of the invention is to provide a machine of the character described having various features of novelty and advantage, and which is particularly characterized by its simplicity in construction and its efliciency in forming holes, especially relatively deep ones, with speed and accuracy.

In accordance with the present invention, the construction is such that the drill, for instance, when forming a deep hole, may be reciprocated at intervals so as to clear the hole of chips, and the reciprocating movement of-the drill and the feeding movement thereof are so co-related that the drilling operation is accomplished in a relatively short time without danger of breaking the drill or damaging the work. Provisions are made for setting up the work in proper relation to thedrill, for holding the drill steady at'the start of the drilling operation, and for automatically stopping the feed of the tool or 'drill when the hole in the work has reached the desired depth, all as hereinafter described more in detail.

I desireit to be clearly understood that the present invention is by way of exemplification only and-yfwhile" the various features of the and the method resulting therefrom e'des'cribed with reference to their use drilling: holes, and to which use the ma- 1 ne is particularly adapted, theinvention is susceptible of various modifications and embodiments- The terms here used are merely terms of description and not in any sense terms of limitation.

Inthe accompanying" drawing, and wherein I havev shown, byway ofillustration only, one embodimentwhich the machine of the present. invention make take;

Figure 1 is.- a-"si'de elevational view;

- Fig.2 ,is a vertical longitudinal section v throughthe idriving mechanism, this 'view being takenj substantially on 'line '2-2 of Fig. 3*is a' transverse view 'of what is shown in Fig. 2, being taken substantially on line' 33 of. Figs. 2 and 4;

Fig. 4 is a sectional view taken on line 4-4 of Fig. 3;

Fig. 5 is a detail view showing the mechanism for engaging the clutch through which the drill spindle is intermittently reciprocated;

Fig. 6 is a top plan view, with parts broken away, of the mechanism for starting and stopping the feed;

Fig. 7 is a view of an overrunning clutch employed in the mechanism disclosed in Fig. 6;

Fig. .8 is a vertical transverse section of the mechanism shown in Fig. 6, taken on line' 88 of Fig. 1;

' Fig. 9 is a detail view of the device for tripping the clutch shown in Fig. 5;

Fig. 10 is a sectional view taken on line 10-10 of Fig. 1 and shows the connection be-v tween the crank and pitman by means of which the tool spindle is reciprocated;

Fig. 11 is a view of the work support and gheudevice for centering and steadying the Fig. 12 is a view showing diagrammatically the relation between the work and the drill, just as the latter has completedits reciprocating movement; Y

Fig. 13 is a top plan view of the work holder and the work positioning devices carried thereby;'and

I Fig. 14 is a sideelevational view of what is shown in Fig. 13;

The general arrangement andorganization of the principal parts of the machine are briefly as follows: 1 denotes a frame of any suitable or approved construction, onone end of which is mounted for vertical adjustment a work support or table I), and 0 is a spindle support in which the drill spindle d, is suitably journalled for longitudinal feed-- ing movement, the support 0 being mounted for reciprocation in suitable ways e on the top of the frame. Carried by the support 0 is a mechanism, designated generally by the letter 7, for controlling the starting and stopping of the drilling operations, this mechanism beingdriventhrough a feed shaft 100 g which, together with the tool spindle d and the means including a crank it for reciprocating the tool spindle, is driven by suitable in a succession of steps and, in the intervals between the feeding movements, the support a and the drill spindle are reciprocated in unison. As hereinafter pointed out more in detail, the reciprocating mechanism is such that, at the beginning of each reci rocating movement of the drill, the latter is edslight- 1y into the work and, at the completion of the reciprocating movement, the drill point is slightly spaced from the bottom of the hole in the work so that breakage of the drill is guarded against.

Referring now to the detailed construction of the machine, the forward end of the drill spindle, as shown in Figs. .1 and 6, is journalled in, but not fixed against longitudinal movement relative to, a rack sleeve 10 mounted for sliding movement in the support '0. The other end of the work spindle has sliding movement in, but is splined to, so as to rotate with, a sleeve or quill 11 journalled against longitudinal movement within the gearbox i, as most clearly shown in Fig. 2. The sleeve 11, together with the drill spin- ,dle, is continuously driven from a main shaft 12 through the stepped pulleys 13'and 14 connected by a belt 15, and the

stepped pulleys

16 and 17 connected by a belt 18. The stepped pulley 17 is fixed to the sleeve 11. The

stepped pulleys

13, 14, 16 and 17 constitute selective speed mechanism by means of which the drill spindle may be driven at any desired or selected rate of rotation.

To effect automatic feeding movement of the drill, the rack sleeve 10, together with the drill spindle carried thereby, is fed forwardly in the then stationary-support c by the s aft 9 operating through the mechanism designated generally by the letter f, and

. shown most clearly in Figs. 6, 7 and 8. This mechanism will be described more in detail hereinafter, but it may be here stated that the shaft 9 carries a worm 26 meshing with a worm wheel 27 adapted to be automatically fixed by the clutch mechanismshown in Fig.

7 to a sleeve 28 having a pinion 29 which is in mesh with the teeth on the rack sleeve 10. The feed spindle or shaft 9 is connected up to the drill spindle as follows: Splmed on the drill spindle is a worm 30 meshing with a worm wheel 31 fixed on a transverse shaft 32 mounted in suitablebearings 33 and provided with a spiral gear 34 meshing with a gear 35 fixed to a hollow shaft 36 provided with stepped gears 37 meshing with the re spective gears '38 'fixed to a sleeve 39 which slidably and rotatably receives the rear end of the feed shaft g. The gears 37 are selectively fixed to the shaft 36 by a pawl 41 connected to a rod 42 slidably mounted within the shaft 36 and having a rack 43 with which meshes a toothed disk 44 (Fig. 3) carried on the lower end of a vertically extending shaft 45 mounted in a bearing 46. The shaft 45 has, at its upper outer end, a handle It will be seen that, with the arrangement of gearing described, the selected speed at which the feed spindle g is to be driven to effect the desired rate of feed of the drill is obtained by swinging the handle 47 to fix the proper geam37 to the shaft 36. The gears 38, together with the sleeve 39, are continuously driven through the connections just described. The feed spindle g is adapted to be intermittently connected to and disconnected from the sleeve 39 by means of an splined to, so as to have longitudinal movement on, the feed spindle g and having clutch teeth adapted to engage similar teeth on a collar 51 fixed to the sleeve 39 and, in effect, constituting a part of this sleeve. The movable clutch member is provided with a groove 52 in which engage suitable antifriction rollers carried by the yoke 53 of a shipper lever pivoted on a pin 54. The other arm 55 (see Figs. 3 and 5) of the shipper lever carries a stud 56 engaging in an elongated opening 57 in a reciprocable rod or latch bar 58, actuation of which is controlled by a trip device 59 carried by a shaft 60 which is'driven from the shaft 32 through the intermeshing

gears

61, 62. The clutch members 50 and 51 are normally urged into engagement with one another by a spring 63. The clutch member 50 is held out of engagement with the clutch member 51, during the reciprocation of the drill support and spindle, by the engagement of a pawl or finger 64 carried by a lever 65 against a shoulder 66 on the sleeve 50. The lever 65 is raised to withdraw the finger 64 from the shoulder 66 and thereby permit re-engagement of the clutch members imwork at a, gradually increasing speed and, as the drill approaches the bottom of thehole by an intermittently rotated crank or arm h and, while the support a is so reciprocated, there is no feedin movement of the drill spindle relative to t e support. The forward end of the pitman k is pivotally connected to the support as at 75, and the othereend of the pitman is adjustably connected to the crank arm 11. by means of a bolt 76, as shown most clearly in Fig. 10. When the crank arm h is at rest, the connecting bolt 76 is slightly above a line passing through the center of rotation of the crank h and the pivot connection 75; that is to sa the distance between. the center of rotation the connection 75 an of the crank it is slightly less than the combined efiiective lengths of the pitman and the crank. The advantage of this arrangement will be understood from the following:

When the crank it starts to turn in a counter-clockwise direction, and at which time feeding of the drill spindle throu hthe mechanism f has ceased, the pitman wifigive a very slight forward-movement to the support 0 thereby causing the drill to be advanced or fed very slightly further into the Work but not to a suflicient extent to break the'tool. Then the drill is withdrawnto clear the hole and drill of chips, and the drill is then re-,

turned into the work until the forward end or point thereof is just short of the bottom of the hole, as shown in Fig. 12, at which time the crank it ceases its rotary movement. It

will thus be seen that when the drill is brought back into operative position, the forward end thereof Wlll be spaced fromithe bot-' tom of the hole, thus eliminating any danger of the drill being brought with force against an unyielding surface and resulting in breakage of the drill or damage thereto. It will further be observed that, while the angular speed of rotation of the crank arm may be uniform, the resultant reciprocating movement of the drill spindle is not uniform; that is to say, when the crank starts to turn,the drill spindle will be fed avery slight extent forwardl into the work at a relatively slow speed an will then be withdrawn out of the on completion of the rotary motion of the crank, the rate at which the drill is advanced is gradually retarded, giving the flutes of the drill sufficient opportunity to pick up any chips which may have remained inthe hole.

The spindle support 0 is so .adjustably connected to the crank h that the extent of reciprocation of the support, to ether with the tool carried thereby, may be c ianged, but the support willat all times, during the feeding movement of the drill spmdle, be in the same osition. In the present instance, this is rought about by providing the pitman and crank with correspondingly spaced holes, as shown in Figs. 1 and 10, theholes in the pitman being designated'by the references 77",

77" and 7 7 and the holes in the crank bearing the references 7 8, 78 and 78. If a reciproeating movement of maximum extent is desired, the bolt 76 will be positioned in the openings 77 a and 78. If a relatively small extent of reciprocation is desired, the bolt will be positioned in the openings 77 and 78, and if a medium stroke is referred, the central openings 7 7 and 7 8 Will receive the bolt. It will he noted that, irrespective ofthe openings in which the bolt 76 is positioned for connecting the itman and crank, the tool support 0 will a ways be-brought hack to the same position. 'With this arrangement,

should it be desired, for example, to start with a relatively short stroke and finish up the drilling of the hole with a relatively large stroke, the bolt may be changed from the holes 7 7, 78 to the holes 77, .78 without disturbing the operative position of the support 0 or the tool spindle carried thereby.

The crank it is intermittently I rotated through the following driving connections. Referring to Figs. 2 and 3, on the main shaft 12 is a gear 80 driving, through an idler 81-, a

gear 82 fixed on a shaft 83 carrying a worm 84 meshing a relatively large worm, wheel 85 fixed to a sleeve 86 loose on a shaft 87, the latter carrying at its forward end the crank 72.. The sleeve 86 is intermittently connected to the shaft 87, so as to drive the same, through an escapement clutch which includes a toothed ratchet wheel 90 keyed to the sleeve 86 and the disk 68 pivotally carr ing a pawl 92. This pawl is normally urge in a direction to engage it with the teeth of-the ratchet Wheel 90 by a spring pressed plunger 93 carried by the disk 68. It will be understood that the sleeve 86, together with the ratchet wheel 90, is continuously driven through the

gears

80, 81 and 82 and the worm and

Worm gear

84, 85, and when the pawl engages the "the same in tr1pped;position.- The trip device 59 is provided with one or more suitable fingers which are adapted to engage a lug 97 on the latch bar 58 to move the same to the right, referring to Fig. 5, and thereby release the pawl 92. When the pawl is thus released, it engages the constantly driven ratchet wheel 90, resulting in the disk 68, together with the crank arm It, being drlven through one complete revolution, whereupon the latch bar 58, having been returned to normal position'by the spring 95, will trip the pawl 92. When the latch bar is moved Y the ratchet wheel 90 so that, as soon as the reto the right as just described, the end of the slot 57 in the latch bar will engage the stud 56 and swing the shipper lever in a direction to move the clutch sleeve 50 out of engagement with the clutch member 51. The clutch sleeve 50 will be held in disengaged position by the finger 64 on the lever 65. Disengagement of the clutch, of which the sleeve 50 is a part, takes place almost simultaneously with the engagement of the escapement clutch so that feeding of the drill spindle stops upon reciprocation of this spindle. In order to insure that the disk 68 will stop at such position that the free end of the crank arm h is slightly above the line of centers, as previously described, the disk is provided with a notch 99 in which is adapted to engage the lower end of a spring pressed plunger 100. The trip 67 is so positioned on the disk 68 that it will trip the lever 65a very short time before, but almost simultaneously with, the disengagement of the pawl 92 from ciprocating movement of the drill spindle has been completed, the feed of the drill will commence.

The construction of the trippin device 59 is such that the frequency at w ich the drill spindle is reciprocated may be changed at will. In the present illustrative disclosure, the tripping device 59 is splined for longitudinal adjustment on the shaft 60 and is provided on one of its arms with a single finger 96, and on the other of its arms with two fingers 96 and 96. The fingers 96 and 96 are diametrically disposed and are in the same plane. Vith this arrangement, when it is desired to reciprocate the drill at less frequent intervals, as, for instance, at the start of the drilling of a deep hole, at which time the drill may enter the work to a greater extent without being clogged with chips, the trip device is adjusted so that the finger 96 is in alinement with the lug or abutment 97 andtherefore, on each revolution of the tripping device, the escapement clutch will be engaged but once. When it is desired to reciprocate the drill at closer intervals, as,

for instance, when the hole being drilled has reached a considerable depth, the tripping device is adjusted so that the fingers 96 and 96" will alternately engage the lug 97 on the latch bar, thereby permitting engagement of the escapement clutch and reciprocation of the drill spindle twice for each complete revolution of the tripping device. It may be desired, in some instances, to perform a drilling operation without reciprocating the drill as, for instance, where a hole in a relatively thin piece of metal is to be drilled and, in this case, tripping of the escapement clutch may be avoided by moving the trip device to a position where none of its fingers will engage the lug on the latch bar. It is, of course, ob-

vious that the tripping device may be provided with any suitablenumber of fingers, depending on the desirability of reciprocating the drill more or less frequently, for instance, if it is desired to reciprocate the drill three times durin each revolution of the tripping device, t is tripping device may have three additional fingers spaced 120 apart in the same plane. The tripping device 59 may be shifted on the shaft 60 to any predetermined position of adjustment by means of a lever 101 pivoted on a vertical'stud 102 and having at its inner end a pin or roller 103 engaging in an annular groove 104.111 the hub of the tripping device. I

Reference will now be had to the mechanism, here referred to, for convenience, as the feed mechanism, and shown most clearly in Flgs. 6, 7 and 8. Some of the main parts of this mechanism have been previously described. Extending axially through the holhollow shaft 28. This recess or key-way is slightly larger than the pin or key 109 so that the shafts 28 and 106 may have a slight rotary movement relative to one another. Within the worm wheel 27 which, as previously stated, is continuously driven through the feed shaft 9, is a clutch member or shoe 111 adapted for driving engagement with the internal periphery of the worm wheel and connected by a link 112 to the sleeve 28. The arrangement is such that when the shaft 28 is rotated in the direction of the arrow, Fig. 7, faster than the worm wheel 27, the shoe will not be in gripping relation with the clutch surface of the worm wheel but, when the worm wheel is rotated faster than the shaft 28, then the shoe will be wedged against the internal periphery of the worm wheel. resulting in the shaft and the worm wheel being driven in unison. The toggle connection, including the shoe 111 and the link 112, is normally urged by a spring pressed plunger 113 in a direction to maintain the shoe in engagement with the worm wheel. Pivoted to the shaft 28, as at 114, is a knock-off lever 115 carrying at its outer end, an adjustable screw 116 and engaging at its inner end against a cam surface 117 provided on the in- .ner shaft 106. For the purpose of automati- Ill ver 122 in a clockwise direction and against an adjusting screw 126.-

The operation of the,feed mechanism is briefly as follows: To manually feed the drill to the work, the handle 107 is rotated in a. clockwise direction at a reater speed than that at which the worm w eel is driven by the feed shaft 9. When the drill has thus been manually fed up to the work, the handle is given'a slight counterclockwise movement,

whereby the cam surface 117 will move the screw 116 into engagement with the shoe 111 so that the latter will not contact'with the clutch surface of the worm 27, thus preventing further feedin of the drill. The ring 120 will be turne so as to bring that graduation which indicates the depth of the hole to be drilled opposite the lndex mark 124. For instance, if a hole of five inches is to be drilled, the graduation 5 will be-brought into registry with the mark 124. The r ng 1s then secured in this position by a suitable clamp, which, in the present instance, consists of a hooked lever 127, one end of which rests upon the top of the ring 120 and the other end is adjusted by a screw 128. To start the automatic feeding of the drill spindle, the handle 107 is now given a slight rotary motion in a clockwise direction, permitting the spring pressed plunger 113 to move theshoe 111into clutching engagement wlth the worm 27', whereupon the worm will feed the drill spindle through the clutch, the hollow shaft 28 and the gear 29 and rack sleeve 10. During the drilling operation, the drill spindle is automatically and intermittently reci rocated, as previously described, and the drill spindle is fed forwardly each time the drill spindle sup ort c is brought to operative position. hen the hole has been drilled to the desired depth, the outer end of the lever 122 will engage the stop 121, thereby stopping rotation of the manually operable shaft 106 which will result in the cam surface 117 on this shaft throwing the knockoff lever 115 in a direction to disengage the clutch shoe 111 from the worm wheel 27. The purpose of the spring pressed plunger or pin 125 is to cause the shaft 106 to rebound slightly after the lever 122 strikes the stop 121,

and thereby insure that the knock-01f device sharply disengages and entirely removes the shoe 111 from the worm wheel.

The work support is in the form of a table I) mounted for Vertical adjustment on the slide 135 carried by ways-136 on the frame a. In the present illustrative disclosure, the table '5 is shown as having a threaded post 137 extending down into the slide 135 and provided with a nut 138 bearing, upon the upper surface of-the slide. It will be seen that by turning this nut in the proper direction, the table will be raised or lowered as desired. The table may also have a rod 139 hold the same steady. table or work support 5 are suitable work p0 having sliding movement in a vertical open ing in the slide 135 so as to properly guide the table in its up and down movements and sition devices, here shown as comprising an end rest 140 and aside rest 141, The end rest is mounted for adjustment longitudinally of the drill spindle and, to this end, the work table is provided with longitudinally extending T-

slots

142 and 143 in which operate the heads of bolts 144 passing through the horizontal web of the angle plate or' rest 140. Preferably, this rest is provided with an opening 145 so as to receive the drill after it has passed through the Work. The rest 141 is mounted for transverse or lateral movement on the table I) and, to this end, the table is provided with a plurality of T-slots 146 in which is adapted to selectively engage the headof a bolt 147 passing through a longitudinally extending slot 148 in the horizontal web of the rest 141. Also, the rest 141 has a bracket arm 149 between which and the body portion of the rest 141 the vertical web of the rest 140 is adapted to closely but'slidably fit, as shown most clearly in Fig. 14. On the rear face of the rest 140 is a'T-slot 150 in which engages the head of 'abolt 151 carried by the bracket arm 149. It will be seen that the rest 141 is adjustably secured to the rest 140 by the bracket arm 149 and thebolt 151 and that the slot 148 in the rest 141 permits both rests to be adjusted in unison longitudipiece of work is to be operated upon, the bolt 147 may be positioned to engage in one of the forward slots 146, and when a longer piece of work is to be operated upon, the rests are moved back, that is, to the left, and the bolt 147 is engaged in one of the rear slots 146.

Mounted upon the In comblnation with my improved work supporting and positioning means just described, I employ a device, which may be termed as a steady or spotting rest, for holding the free end of the drill rigidly against lateral movement during the operation of positloning the work on the table I; and at the start of the drilling operation. steady'rest includes a bracket 155 secured to and arising from the side of the slide 135 and an arm 156 pivoted as at 157 to the upper end of the bracket 155. The arm 156, adjacent its free end, has a round aperture adapted to interchangeably receive 1 bushings having opemngs of various sizes, one of these bushings bemg shown in the drawings aIi' nated'by the numeral 158; 3 When the rin11'56 is in operative position, that is intlie position dle. It will be understood thatthat-bushin'g' will be selected which has ahole' of the same This drill diameter as the outside diameter ofthe'driI-I so as to closely but slidabl receivethe drilL nally of the work spindle. When a shorter. 9

- is' a relatively long one.

The bracket 155 and the arm 156 have stops 160, 161, respectively, which are adapted to engage to properly position the bushings 158 relatlve to the drill. .The bracket 155 and.

the arm 156 are further provided with stops 162, 163, respectively, which are adapted to engage to limit the downwardly swinging movement of the arm 156. 164 designates a handle on the free end of the arm 156.

To set up the machine so it will operate upon a selected piece of work, the drill and work table I) are brought into overhanging relation, as shown in Figs. 13 and 14, with the drill extending through and supported against lateral movement by the steady rest. Assuming that the hole is to be drilled in the piece of work a certain distance from the ottom edge of the latter, a gauge plug 'or block, such as 165, will be selected of a d1ameter equal to the distance between the bottom edge of the work and the center of the hole to 'be made therein minus one-half the diameter of the drill. This block is positioned beneath the drill, and then the nut 138 is turned so as to raise the table I) to the position shown in Fig. 14. Assuming that the hole is to be drilled a certain distance from one side edge of the work, a gauge plug, such as 166, will be selected of a size equal to this distance minus one-half the diameter of the drill and p ositioned alongside of the drill, as shown in ig. 13. The side rest 141 is then laterally adjusted so as to engage the gauge plug 166, as shown in this figure, and then the bolts 147,151 are tightened up. The drill is now withdrawn and the work positioned upon the table I) and against the rest 141. Since the drill has been securely held against movement by the steady rest during the operation of positioning the work relative thereto, it is assured that the work is in proper relation to the drill.

The operation is briefly as follows: Before throwingthe power onto the machine, the drill is manually fed forward by turningthe handle 107 of the feeding mechanism until the drill point j usttouchesthe work. he drill steady rest 156 is held in operative position so-thatthe drill extends through the bushing 158. The dial or disk 120 is then set, as previousl described, so that the feeding of the tool Wlll be automatically stopped when the latter has reached the desired depth. The power is now thrown on. and the handle 107 of the feeding mechanism 7' is given a slight clockwise movement so as to engage the clutch,

shown in Fig. 7 whereupon the drill will be automatically fed forward and, while so fed, the steady rest 156 is held against the stop 160.. Thus, the drill is held steady when it starts to make the hole in-the work, a feature of importance particularly where the drill After the drill has been fed into the work a predetermined distance, the trip device 59 will come into play to tated to reciprocate the tool spindle support 0 and the drill. As previously stated, when the drill is thus reciprocated, it is fed a slight distance forwardly into the work, then withdrawn so as to clear the hole and the drill of chips, and then moved forwardly into the hole to a position where the drill, point is slightly spaced from the bottom of the hole and, at this point. the escapement clutch is disengaged and the feed shaft clutch is engaged. The drill is then fed forward until the trip device 59 again comes into play, when the support 0 will be again reciprocated and the cycle of operation is repeated until the drill has gone into the Work to a predetermined depth, at which time the lever 122 of the feeding mechanism will engage the stop 121 onthe dial 120, thereby disengaging the clutch shown in Fig. 7.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing fromthe scope thereof, it is intended that allmatter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limitin sense.

it is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

I claim as my invention:

ed therein for a rotary and longitudinal move ments, a feed shaft movable with said support, connections in said support between said feed shaft and spindle, means for periodically driving said feed shaft. and means for reciprocating said support and spindlein unison between the feeding movements of said spindle the reciprocating movement of said support and spindle being in the line of the feeding movement of the spindle.

2. In a machine of the character described, a reciprocable support, a rotary spindle mounted therein for longitudinal movement in the line of reciprocating movement of said support, selective driving means for said spindle, mechanism for intermittently reciprocating said support and spindle in unison, means for periodically feeding said spindle in said support, and selective driving mechanism for said feeding means. f

3. In a machine of the character described, a reciprocable support, a rotary spindle mounted therein for longitudinal movement in the line of reciprocating movement of said support, an intermittently rotated crank for reciprocating said support and spindle in unison, a periodically driven feed shaft for feeding said spindle relative to said support and in the direction of reciprocating movement of the latter, and means for continuously driving said spindle.

4. In a machine of the character described, a reciprocable support, a rack sleeve mounted for sliding movement therein, a spindle j ournalled in said rack sleeve, a feed shaft jour-. nalled in and movable with said support, a driving connection between said feed shaft and sleeve, a crank, a. pitman between said crank and support, and mechanism for continuously driving said spindle and intermittently and alternately rotating saiddeed' shaft and crank.

5. In a machine of the character described, a reciprocable support, a tool spindle mounted for rotary and longitudinal movements therein, means for driving said spindle,

feeding mechanism for said spindle in-- cluding a feed shaft movable with said support, means including a crank and a clutch for reciprocating said support and spindle, means for engaging said clutch and disengaging said feeding mechanism, and means for engaging said feeding mechanism upon completion of one revolution'of said crank.

6. In a machine of the character described, a reciprocable support, a tool spindlemounted for rotary and longitudinal movements therein, means for feeding said spindle including a feed shaft and a clutch associated therewith, means including a one-revolution clutchand a crank for reciprocating said support and spindle, means for substantially simultaneously engaging said last mentioned clutch and disengaging the first mentioned one, means associated with the first mentioned clutch for holding the same in disengaged position, and means associated with the second mentioned clutch for disengaging the last mentioned means.

7. In a machine of the character described, a reciprocable support, a tool spindle having rotary and longitudinal movements therein,

' means for intermittently reciprocating said g 8. In a machine of the character described,

a reciprocable support, a tool spindle mountedfor rotary and longitudinal movements therein, means. for feeding said spindle, means including a clutch for driving said feeding means, means for reciprocating said support and including a clutch, and a trip device controlling said clutches and adapted to alternately throw the same out of engagement, said trip device being adjustable to render the same inoperative.

9. In a machine of thecharacter described, a reciprocable support, a spindle mounted for rotary and longitudinal movements therein, means for periodically feeding said spindle relative to said support, means for intermittently reciprocating said support and spindle, means for driving said spindle, and controlling means for controlling said reciprocating means and feeding means, said controlling means being adjustable to vary the intervals at which said reciprocating and feeding means operate.

10. In a machine of the character described, a reciprocable support, a spindle mounted therein for rotary and longitudinal movements, means for periodically feeding said spindle relative to said support, means for intermittently reciprocating said support and spindle, selective drive mechanism for said spindle and reciprocating means, selective driving mechanism between said spindle and feeding means, and means operatively connected to said spindle for controlling said reciprocating means and feeding means, said controlling means being adjustable to vary the intervals at which the reciprocating means and feeding means operate and to render said reciprocating means inoperative at will.

11. In a machine of the character described, a reciprocable support, a tool spindle mounted for rotary and longitudinal movements therein, feeding means for said spindle, driving means including a clutch for said feeding means, means including a clutch for reciprocating said support and spindle, a member operatively associated with I said clutches, and a trip device acting on said member and driven from said spindle, said trip device having a plurality of fingers adapted to engage said member and operate the same, and said trip device being adjustable to bring predetermined fingers into operative relation thereto.

12. In a machine of the character described, a tool spindle, means including a crank for reciprocating said spindle and arranged to move the tool spindle slightly forwardly at the beginning of the reciprocating movement to feed the tool into the Work, said crank, at the beginning of its reciprocating movement, being slightly back of the limit of its forward movement and means for feeding said spindle between the reciprocating movements thereof.

13. In a machine of the character described, a reciprocable support, a tool spindle mounted therein for rotary and longitudinal movements, means for reciprocating said support and spindle in unison and arranged to feed the same slightly forwardly towards the work at the beginning of the reciprocating movement, and means for feedlng said 15. In a machine of the character described, a reciprocable support, a tool spindle.

mounted for rotary and longitudinal movements therein, an intermittently rotated" crank, a pitman between said crank and support, means for intermittently rotating said crank and arranged to stopthe rotation thereof slightly before the greatest effective length of the crank is reached, and means for feeding said spindle between the rotary movements'of said crank.

16. In a machine of the characterdescribed, a reciprocable support, a tool spindle mounted for rotary-and longitudinal movements therein, means for driving said spindle, means for periodically feeding said spindle relative to said support, means for reciprocating said support and spindle between the feeding movements of the spindle, and means .for varying the extent of reciprocation of said support without changing the normal position thereof.

17. In a machine of the character described, a reciprocable support, a tool spindle mounted for rotary and longitudinal movements therein, means for periodically feeding said spindle, an intermittently actuated member for reciprocating said support, and a connection between said member and support adapted to be adjustably connected to said member to vary the extent of reciprocation of the support without changing the normal position thereof.

18. In a machine of the character \described, a reciprocable support, a tool spindle mounted for rotary and longitudinal movements therein, means for periodically feeding said spindle relative to said support, a

crank, means for intermittently rotating the same, a pitman between said crank and sup port, correspondingly spaced openings in said support and crank, and a pivot member adapted to be selectively positioned 1n corresponding openings.

19. In a machine of the character described, a tool spindle,-means for intermittently reciprocating said spindle and arranged to feed the spindle a slight distance and slowly towards the work at the beginning of the reciprocating movement, means for. varying the extent of reciprocation of said spindle without changing the normal position thereof, and means for feeding said.

between said support and crank and adjustably connected to the latter to vary the extent of reciprocation of said support without changing the normal position thereof, and

means for feeding said spindle in said sup- 1 port between the reciprocating movement thereof.

21. In a machine of the character described, a reciprocable support, a tool spin- I dle mounted for rotary and longitudinal movements therein, means for reciprocating said support and spindle and adjustable to I vary the extent of reciprocation thereof without changing the normal position of said support, means for feeding said spindle between the reciprocating movements thereof, and means for varying the intervals at which said reciprocating means and feeding means operate.

22. In a machine of the character described, a reciprocable support, a tool spindle mounted. for rotary and longitudinal movements therein, selective drive mechanism for said spindle, means for periodically feeding said spindle, selectivedrive mech- IOU anism between said spindle and feeding means, means for intermittently reciprocating said support and arranged to slightly feed the support and spindle towards the work at the beginning of the reciprocating movement thereof, means for changing the extent of reciprocating movement of said support,,and means for varying the inter- 'vals at which said feeding means and reciprocating means operate.

23. In a machine of the character described, a reciprocable support, a spindle mounted-therein for rotary and longitudinal movements, automatically operated means for intermittently reciprocating said support and spindle, a feed shaft journalled in and movable with said support, an operative connection between said shaft and spindle having means for automatically arresting the feeding movement of the spindle at a predetermined point, and means for driving said shaft between the reciprocating movements of said support and spindle.

24:.- In a. machine of the character described, a reciprocable support, a tool s indle mounted for Irotary and longitudinal movements therein, automatically operated means for intermittently reciprocating said support and spindle, a feed shaft journalled in and movable with said support, means for periodically reci rocating said shaft, a clutch between sald feed shaft and spindle and carried by said support, means carried by said support for manually throwing said clutch into and out of engagement, and adjustable means for automatically throwing said clutch out of engagement to stop feeding w of the spindle at any desired predetermined point.

BENGT M. w. HANSON.