US831698A - Drilling-machine. - Google Patents

Description

PATENIED SEPT. 25, 1906.

B.) F. BARNES; DRILLING MACHINE.

AY PLIUATION FILED MAY 20. 1903.

a sums-sum 1.

PATBNTED SEPT. 25, 1906.

B. E. BARNES.

DRILLING- E LRCHINE.

APPLICATION rum) my 20. 1903 3 SHEETS-SHEET 2.

No. 831,698. I PATENTED SEPT. 25, 1906 B. F. BARNES.

DRILLING MACHINE.

APPLICATION TILED MAY 20. 1903.

8 SHEETS-SHEET 3.

' W I L LE-L WKWQEC ing the parts in their starting or initial shaft.

UNITED srarns Parana orrren.

Specification pf Letters Patent.

Patented Sept. 25, 1906.

Application filed May 20, 1903. Serial No. 158,054.

To all whom it may concern.-

Be it known that I, BENJAMIN F. BARNES,

a citizen of the United States, residing at Rockford, in the county of Winnebago and State of Illinois, have invented certain new and useful Improvements in Drilling-Machines, of which the following is a specification.

This invention relates to drillingrmachines, and refers particularly to the mechanism for automatically raising and lowering the drillspindle. Much time is consumed in the operation of drills of the ordinary construction in advancing the drill from its starting-point to its work and in raising it after its work is done to said starting-point.

The object of this invention is the provision of a mechanism intended to obviate the objection mentioned by fitting a drilling-machine with means for quickly advancing the drill to its work and for quickly returning said drill to its initial or starting position after its work is done.

A further object of the invention is the combination in a drilling-machine of said quick feed with the work-feed.

The invention has for a further object the various improvements in construction hereinafter more fully pointed out.

In the accompanying drawings, Figure- 1 is a side elevation of a drilling-machine em-,

bodying the features of this invention, showposition. The lower part of the supporting-cot umn and the work-table are not represented as the invention does not refer thereto. 2 is a similar view taken from the opposite side of the machine, the parts being in the same position as in the preceding figure. Fig. 3 is a front elevation of this drilling-machine, the parts being in the same position as in Fig. 1. Fig. 4 is a detail sectional view taken on the axial line of the feed-shaft. Fig. 5 is a transverse sectional view taken through the feed-shaft, showing the wormwheel and its ratchet connection with said Fig. 6 is a side elevation of the friction drive-pulley for the quick-feed 111echanism. Fig. 7 is a face view of the cam-disk of the quick-feed mechanism in the position it occupies in Fig. 1, showing the fixed stop-pin and the roller-studs of the detent-arm. Fig.

I Fig.

8 is a similar view showing the disk after half 1 a revolution-that is to say, in the position it occupies after the quick feed has operated to lower the drill-spindle to its work.

In the embodiment herein shown of this invention a drillinganachine is supplied with a work-feed susceptible of the usual changes in speed by means of cone-pulleys and in this instance adapted to be connected with and disconnected from the drill-spindle. A further mechanism is provided to quickly advance the drill to its work and quickly restore the drill to its starting position, which quick-acting feed mechanism is arranged to operate conjointly with said work-feed, but not concurrently thercwith-that is to say, the quick feed places the drill in a position adjacent to its work, the work-feed then advances the drill through the work, and finally the quick feed restores the spindle to its starting position.

In the construction of drillingmachine embodying my invention I provide a main frame 1, comprising the supporting-column 2, the integral upwardly-extending rear arm I 3, the upwardly-extendmg forward arm 4, the

connecting-M1115, the fixed horizontal shaft 6, and the bracket 7, secured at its rear end to the connecting-arm 3 and at its forward end to the fixed shaft 6. A drill-spindle 8 is mounted in the usual manner in the supporting-frame 1 and is provided with a sleeve 9, having an integral rack 10, by means of which said spindle is raised and lowered. A drive-shaft 11 is rotatably mounted in the upper part of the suppi)rting-frame and is connected with the drill-spindle 8 by means of the bevel- gears 12 and 13,.the former fixed on the forward end of the drive-shaft and the latter splined upon the drill-spindle. A cone driving-pulley 14 and a cone feed-pulley 15 are fixed upon the drive-shaft 11. The drill-spindle is counterbalanced by a weight (not shown) connected with said spindle by means of the chain 16, and said spindle is raised and lowered by a pinion 17, fixed upon the feed-shaft 18, which pinion meshes with the teeth of the rack 10. The feed-shaft 18 is supported in suitable bearings in the main frame, and its outer end is connected with the fixed shaft 6 of the main frame by means of a bracearin' 19. Between said brace-arm and the the feed-shaft l8 carr es a spider 20, having radial openings 21 for receiving a'lever (not,

shown) for raising and lowering the spindle by hand. The feed shaft also carries a ratchet-Wheel 22, fixed to said shaft, and adjacent to the ratchet-wheel a worm-wheel 23, loosely mounted on the shaft, but engaging with the ratchet-wheel by means of pawls 24,

' pivotally mounted upon the side of the wormnected by means of a drive-belt 29.

wheel and held in contact withthe teeth of the ratchet-wheel by means of the springs 25.

The opposite end of the feed-shaft 18 carries a pinion 26, fixed thereon.

The work-feed will first be described. A shaft 27 is" rotatably mounted in suitable bearings in the bracket 7 of the main frame and carries a cone-pulley 28', coinciding with the similar cone-pulley 15, fixed upon the drive-shaft, said pulleys being rotatably con- The forward endof the shaft 27 carries a bevelpim'on 30', adapted to mesh with the teeth of a bevel-gear 3.1, fixed on a shaft 32'fro tatably mounte in a swinging yoke 33, which yoke is supported upon the fixed shaft 6 of the main frame. The lower end of the shaft 32 carries a worm 34, adapted to mesh with the worm-wheel 23 of the feed-shaft, To shift the worm 34 into and out of engagement with the worm=wheel 23, the lower end of the yoke 33 is provided with an oblique elongated opening 35, through which extends a stud 36, fixed to an operating-lever 37, which lever is pivotally supported upon the stud 38, se-

cured to the main frame. The forward end of the operatingdever terminates in the handle 39, and the rear end carries a roller 40,

adapted to engage the conical point of a spring-plunger '41, which plunger 'tends to h'oldthe operating-lever at either extremity of its oscillatory movement. When the operating-lever is raised, the-worm 34-is thrown into engagement with the worm-wheel 2.3,, and the feed-shaft 18 will be rotated by the work-feed.

The quick feed will next be described. A

shaft .42 is supported in suitable bearings in the main frame andcarries at its rear end a spider 43, fixed on said shaft, which spider is provided with radial arms 44, carrying at their outer ends friction-shoes 45, having a facing 46, of leather or other suitable mate rial. These friction-shoes are held by means 'of the coil-springs 46 outward against the finished innersurface of a drive-pulley 47,

' loosely mounted upon said shaft 42, and have a constant frictional .enga ement with said pulley. The forward end 0 the shaft 42 carries a bevelinion 48, which pinion meshes with the teet of a bevel-gear 49, fixed upon one end of a short transverse shaft 50,ro ta' tablj' mounted in a suitable bearing in'the up er part of the main frame. The-opposite .6! of the shaft 50 carries acam-disk 51, having a rim 52 projecting from the face thereof.

The rim 52 is annular save for a notch 53, cut. therefrom, and an inwardly-extending cam portion 54 adjacent to said notch. The notch forms a stop-shoul ler 53*, the function of which and of the inclined cam portion 54 At a point diametv will appear hereinafter. rically o posite the notch 53 the rim 52 is provide with a stud 55. A detent-arm 56 is pivotally supported upon the main frame at a point adjacent to the cam-disk and carries near its forward end two roller- studs 57 and 58, adapted to lie upon opposite sides of the rim 52. the detent-arm is provided with a stop-pin 58, adapted to li in the path of and be engaged by the stur 55 on said rim. tent-arm 56 is connected with the operating- At a point between these roller-stu ds The delever 37 by means of the pivotal link 59 and is moved with said lever by reason of such connection. The bevel-gear 49 carries upon its outer face a wrist-pin 60', upon which wrist-pin is mounted a screw-threaded rod "-61= earrying correspondingly screw-threaded adjusting- collars 62 and 63 and locking-" collars 62 and 63. Intermediate said' collars 62 and 63 the screw-threaded rod extends through a sleeve 64, which sleeve is pivotally connected with a gear-sector arm 65, affording by an adjustment of said collars on the rod a limited sliding or lost-motion connce tion between the rod and the gear-sector arm. This gear-sector arm is. pivotally mounted upon the supporting-frame by means of the stud 66, and its gear-teeth meshwith those of a pinion 67, which pinion is rotatably mounted upon a stud68, carried by the main frame, and is affixed to an adjacent pinion 69, which latter pinion meshes with 'the pinion 26 upon the feed-shaft 18. The sector-arm is provided with an upwardly-extending projection 70, having three openingsthe upper edge of the operatinglever 37 and to depress said lever when the tripping-rod is reciprocated.

The friction-pulley 47 is constantly rotated by means of a drive-belt 81 but the shaft 42 is normally held stationary against the frictional rotative tendency of said pulley by means of the detent-arm 56 engaging portions of the cam-disk 5]. Whenever the detent-arm is withdrawn, the cam-disk51 and its shaft, being released to the rot ative tend-' ency of the friction-pulley 47, make half a.

revolution, and said screw-threwled rod is 'moved either upward or downward, depend- Lil ing upon the wheel Assuming the parts to be in the position n l l, 2, and 3 of the drawings, ther supposing that motion is being imoartcd to the drive-snaft 11 and to the f riornpull y 47 by suitable belts, the Inamay l e thrown into operation by raising the handle 39,01? the operating-lever 37 suf'ciently to move the stop-pin 58* on the detent-arm 56 from out the path of the stud 55 on the cam-rim 52, releasing the quickl echanism to action. This movement lir- tine operating-lever 37 to start the quick 'l not suiiicient to throw the work-feed in c action. The bevel-gear 49 is now rotatcd by the friction-pulley 47 and the screwth eadcd rod 61 moved downward As soon the collar is brought by this downward iovement of the rod 61 into contact with the pper face of the sleeve 64 the sector-lever 65 i illated, and by means of the gear cono between said sector-lever and the 18 said feed-shaft is rotated to "wer the drillspindle. As the cam-disk 51 'etated the inclined cam portion 5-1- of the rim 52 is brought into engagement with the rolicr-stud 57, raising the detent-arm 56 and with t the operating-lever 37, thereby throwing the worm 34 into engagement with the worm-wheel 23, and thus connecting the feed-shaft 18 with the work-feed. The continued rotative movement of the cam-disk brings the stop shoulder 53 of the cam-rim into engagement with the roller-stud 5S, stepping the rctative movement of the camdi 51 and causing the fi'iction-sliocs again to slip with relation to the frictionwheel e The drillspindle now descends under the action ol the work-feed, moving the gcar-scctor downward slowly, and thereby pushing the (ripping-rod forward until the do '3 on said trippingrod engages the arm .76 and moves it forward. The forward movement ol the arm 76 oscillates the shaft 77', to which said arm is fixed, moving the k-arm 79, also secured to said arm, and erehy depresses the operating-lever 37. This deprec ion cl th operating-lever carries he roller ail to the opposite side ol' the tip of he spririg-plunger 4], whereupon said plun- .ther depresses the lever 37 and the work-feed from the feedlfw by oscillating the yoke 33, thus w ng the worm 34 out of engagement he \.','orn1--\\'hccl 23. it also removes lensrud 58 from engagement with the uldcr oi the cam-disk 5], again g the quick iced to action. The -pullcy 4" through its supportingnow rotates the bevel-gear 49 and ine s luv-threaded rod 61. \Vhen the 63 on lll screw-threaded rod 61 is s r t isc: ll r l.-rouglil into engagement with the under face or" the siceve 64, the gear-sector arm 65 is position of the bevel gearswung upward, rotating the feed-shaft 18 and ralsing the drill-spindle into its starting position. When the wrist-pin" reaches its uppermost osition, the stop-pin 55 on the cam-rim 52 ms been brought by the rotation of the cam-disk 51 into engagement with the stop-pin 58 on the detent-arm 56, again sto ping the movement of the quick feed. T e

mechanism has now completed its cycle of movement and is in a position to be again started by raising the handle 39 of the operating-lever 37. It will be understood that the collars 62 and 63 are adjusted upon the screw-threaded rod 61 to determine the relation between the extent of lost motion and efl'ective movement between the screwthreaded rod 61 and the gear-sector 65. By this means the drill may be raised to any desired height within the limits of the drillingmachine above its work, and all or any portion of its vertical movement may be divided in any ratio desired between the work-feed and the -quick-advance feed. By removing the stop-pin 55 from the rim of the cam-wheel the action of the mechanism may be made contimious, the cycle of movement hereinbel'ore described being constantly and indefinitely repeated. The dog 73 is adjusted upon the tripping-rod 72 to determine the point at which the downward movement of the drill-spindle under the control of the work-feed shall cease and the upward movement of said spindle under the action of the quick feed shall begin, and the rate of the longitudinal movement of said tripping-rod 72 is alter-able by changing it from one to another of the openings 71. To adjust the mechanism to a certain piece of work, the collar 63 is moved to such a position on the screw-threaded rod 61 that the drill will be raised by the quick-feed mechanism to a sufiicient height above the work to amply clear it. The collar 62 is then moved on the rod to such position that when the rod is in its lowcrniost position the drill will be placed by the oscillation of the gear-sector arm immediately above its work, and the dog 73 is located on the tripping-rod 72, so that the crank-arm 79 will depress the operatinglever 37 immediately after the drill emerges through its work. The collars 62 and 63 are locked in these positions by means of their locking- collars 62 and 63, and the dog 73 is set in its )osition by means of the set-screw 74. While the screw-threaded rod 61 always movcs the same distance vertically, any dcsircr portion of its movement may be lost in its connection with the sector-arm 65 and the drill-spindle moved downward to its work by the quick feed any distance dcsirable and restored by said feed to any starting position that may have been selected. The yielding connection between the workfeed and the leed-slraft 18, which in this instance has been made in the form of a ratchet and pawls, permits an overlapping in the application of the work-feed and the quick feedthat is to say, the work-feed may be thrown into action a little before the quick feed ceases to act upon the feed-shaft. If some yielding connection between the feedshaft and one or the other of these feeds was not provided, breakage would result, as it would be practically impossible to throw the work-feed into action at the very instant the quick feed ceased to act upon the feed-shaft. It is a arent that a yielding spring device might )e employed and likewise that various forms of ratchets and ratchet-clutches would answer the purpose. a

It is obvious that many changes and modifications might be made in the quick-feed mechanism Without departing irom the spirit and scope of my invention, also that the quick advance movement {6% the spindle might be eliminated and t e nick-return movement retained, in view! of al l of which I desire to have it understoq d that I do not limit myself to the embodiment herein shown of my invention, but claim said invention broadly.

I claim as my invention 1. In a drilling-machine; in combination, a drill-spindle means for advancing said spindle under one feed speed; jme'ans for advancing said spindle under a diflerent feed speed; and means actuated by one of said advancing means for changing the advance of said spindle from one feed speed to the other.

2. In a drilling-machine, in combination, a drill-spindle means for a" vancin said spindle under one feed speed means i or advancing said spindle under a different feed speed;

means for successively placing said advanc ing means in operative connection with said spindle; and means actuated by one of said advancing means for operating said last-mentioned means.

3. In a d filling-machine, in combination, a

drill-spindle; means for advancing said spin' -dle under one teed speed; means for advancing said spindle under a different feed speed; means for successively placing said advancing means in operative connection with said spindle; means actuated by one of said advancing means fbr operating said' last-mentioned means; anl a yieldin connection between said spindle and the slbwer one of said advancing means.

' 4. In a drilling-m chine, in combination, a drill-spindle; a work eed mechanism and a quick advance-feed mechanism for the spindle, said Work-feed m hanism having a yielding connection with aid spindle ;-1neans for successively placing saidfeeds in connection with said spindle; and 11 cans automate ically actuated for operating said last-mentioned means.

5. In a drilling-machine, in combination, a drillspindle; a work-feed mechanism and a quick-advance-feed mechanism for the spindle, sald work feed mechanism having a yielding connection with said spindle; means tion with said spindle; means automatically actuated for operating said last-mentioned means; and means for varying the extent of the advance movement of the spindle under one of said feeds.

6. In a drilling-machine, in combination, a drill-spindle; a feed-shaft for said spindle; two gears on said feed-shaft, one of said ears having a ratchet connection with saids aft; 9. work-feed adapted to engage with said ratchetgear; a quick-advance feed adapted to mesh with the other one of said gears; means for successively placing said feeds in connection with said s indle; and means-automatically-actuated or operating said lastmentioned means.

7. In a drilling-machine, in'combination, a drill-spindle; a work-feed and a quick feed for successively advancing the s indle; and means for varying the extent of t e advance movement of the spindle under the workfeed; said quick feed comprising means for throwing the work-feed into action. i

8. In a drilling-machine, in combination, a drill-spindle; a work-feed and a' z uick advance and return feed for said spindle said feeds operating successively; means adaptedto be actuated by the quick-advance feed for starting'the'wo'rk-feed; and means adapted to be actuated by the work-feed for starting the quick-return feed.

9. In a drilling-machine, in combination, a drill-spindle; a work-feed and a quick advance and return feed for said spindle said feeds operating successively means for actuating said quick feed a detent for. holding .said quick feed from action, said quick feed comprising means for throwing the workfeed into action, and means for releasing said detent.

1().- In a drilling-machine, in combination,

a drill-spindle; a work-feed and a quick advance and return feed for said spindle. said feeds operating successively; afriction driving means for actuating said quic i feed; means for holding said quick feed from ac- 1 tion and means for releasing said quick feed to action, said quick feed comprising means for throwing the work-feed into action.

11. In a drilling-machine, in combination,

a drill-spindle; a work-feed and aquick ad- I vance and return feed for said spindle, said feeds operating Sll0COSSlVly; means 'l'or placmg either of said feeds in connection with said spindle; and means adapted to be actuated by the quick feed for operating said last- I mentioned means to change from the quickadvance to the work feed and to disconnect the quick return feed.

, 12. In a drilling-machine, in combination, a drill-spindle; a work-feed. and a quick ad a roo mentioned means; and means operated by the work-feed for actuating said means ior placing said i'eeds in connection with the means, a detent for vance and return feed for said spindle; said feeds operating successively; means for placing either of said feeds in connection with said spindle; means adapted to be actuated by the quick feed for operating said lastspindle.

13. In a drilling-machine, in combination, a drill-spindle; a work-feed and a quick advance and return feed for said spindle; said feeds operating successively; means for actuating the quick feed to lower the spindle; means adapted to be actuated by the quick feed for connecting the work-feed with the spindle; and means adapted to be actuated by the advance movement of the spindle under the work-feed for placing the spindle in operative connection with the quick feed to raise said spindle.

14. In a drilling-machine, in combination, a drill-spindle; and a quick advance and return feed for said spindle, said quick feed comprising a driving means, a screw-threaded rod adapted to be reciprocate-d thereby, an oscillatory lever loosely connected with said rod, and nuts on said rod for adjustably limiting the extent of movement of said rod with reference to said lever.

15. In a drilling-machine, in combination, a drill-spindle; a work-feed and a quick advance and return "feed for said spindle, said quick. feed conipiisin a friction driving holding said driving means from. action, a rod adapted to be reciprocated by the driving means, an oscillatory gear-sector. having a sliding connection with said reciprocatory rod, means for limiting the extent of movement of the rod with relation to the sector, a driving connection between the sector and the drill-spindle to raise and lower said spindle, a shitting-lever for throwing the work-feed into connection with the spindle, a cam movable synchronously with the reciprocating rod for operating the shifting-lever to connect the workfeed with the drill-spindle, an arm movable with the gear-sector for operating the shifting-lever to disconnect the work-feed From the drill-spindle and to release the quick feed to the action of its friction driving means to raise the spindle.

16. In a drilling-machine, in combination, a drill-spindle; a quick advance and return feed for said spindle; said uick feed cornpri sing a driving means, a rod adapted to be reciprocated thereby, an oscillatory lever having a guide-sleeve for said rod, and adjustable stops on the rod for engaging said guidesleeve to limit the extent of movement of the rodwith relation to the lever.

17. In drilling-machine, in combination, a drill-spindle; a quick advance and return feed for said spindle, said quick feed comprlsing a friction driving means, a screw-threaded rod adapted to be reciprocated thereby, a detent for hold ng said driving means from action, an oscillatory lever, said rod having a sliding connection with said lever, nuts on said rod for adjustably limiting the extent of movement of the rod with relation to the lever, and means for withdrawing said detent. 18. In a drilling-machine, in combination, a drill-spindle; a work-feed and a quick ad vance; and return feed for said-spindle, said quick feed comprisin a friction drivin means, a rod adapte to be reciprocate thereby, a detent for holding said driving means from action, an oscillatory lever, said rod having a sliding connection with said lever, means for adj ustably limiting the extent of movement of the rod with relation to the lever, a shifting-lever connected with said detent for connectin the work-feed with the tent and operating said shifting-lever.

19. In a drilling-machine, in combination,-

a drill-spindle; a work-feed and a quick advance and return feed for said spindle, said quick feed comprising a friction drivin means, a rod adapted to be reciprocated thereby, a detent for holding said drivin means from action, an oscillatory lever, sai rod having a sliding connection with said 1ever, means for limiting the extent of movement of the rod with relation to the lever, a shifting-lever connected with said detent for connecting and disconnecting the work-feed with the spindle, means for withdrawing said detent and operatin said shiftin -lever, and means adapted to be operated y the ad vance movement of'tlie spindle for operating said shiftingjdever to disconnect the workfeed from the spindle and to release the quick feed to action to" raise the spindle.

20, In a drilling-machine, in combination, a drill-spindle; a work-feed and a quick advance and return feed for saidspindle, said quick feed comprising a friction driving means, a rod adapted to be reciprocated thereby, an oscillatory lever loosely connected with said rod, mcansfor limiting the extent of movement of said rod with reference to said lever, a shifting-lever for connecting the Work-feed with the drill-spindle, a detent to prevent the reciprocation of said rod, means for operating said detent, means moving synchronously with said rod for operatin said shifting-lever to connect the work-fear with the spindle, and means movin with said oscillatory lever for operating sai shifting-lever to disconnect the work-feed from the spindle and to permit the operation of the friction drivin means to raise the s indle.

21. In a drilling-machine, in com ination, a drill-spindle; a work-feed and a quick advance and return feed for said spindle, said quick Feed comprising a driving means, a rod adapted to be reciprocated thereby, an oscilspindle, and means or withdrawing said delatory gear-sector having a sliding connection with said reciprocatory rod, means for adjustably limiting the extent of movement of the rod with relation to the sector, and a gear connection betweenthe sector and the drill-spindle to raise and lower said spindle; and means for successively placing said feeds in action.

22. In a drilling-machine, in combination, a drill-spindle; a work-feed and a quick ad- Vance and return feed for said spindle, said quick feed comprising a driving means, a means for withholding said driving means, from action, a shiftinglever for throwing the work-feed into connection with the spindle,

means operated by the quick feed for actuating said shifting-lever to connect the workfeed with the drill-spindle, means actuated by the work-feed'to operate said shifting-lever to throw the work-feed out of engagement with the drill-spindle and to permit the operation of the quick feed to raise the drillspindle.

23. In a drilling-macl'iine, in combination, a drill spindle; a feed shaft therefor; a quick-return feed having a driving connection with said feed-shaft a,,...wor-k=fe'ed;a ShiftingJeVer"for 'coYine-cting said work-feed with and disconnecting it from the feed-shaft; a friction driving means for said quick-return feed a detent for holding said driving means from action, said shifting-lever and said detent being connected to operate simultaneously; and a device adapted to be moved by the rotation of the feed-shaft under the operation of the work-feed to actuate said shifting-lever to disconnect the Work-feed from said feed-shaft and to withdraw said detent to permit the operation of the quick-return feed to raise the drill-spindle.

24. In a drilling-machine, in combination, a drill-spindle; a feed-shaft a work-feed and a quick-return feed for said spindle; said quick feed having a gear connection with said feed-shaft a worm-wheel loosely mounted on said feed-shaft but having a ratchet connec.- tion therewith; ...a worm forming a part of the work-feed; a friction driving means for said quick-return feed; a detent for holding said quick feed from action; a shifting-lever for moving said worm into and out of engagement with the worm-wheel, which detent and shifting-lever are connected to operate simultaneously; and a device adapted to be actuated by the advance movement of the spindle under the work-feed for operating said shifting-lever to withdraw the worm from engagement with its worm-wheel, also to Withdraw said detent to permit the quick-return feed to raise the spindle.

25. In a drillin -machine, in combination, a drill-spindle; a feed-shaft therefor; a workfeed for said spindle; a worm-wheel loosely mounted on said feed-shaft but having a ratchet connection therewith. said work-feed comprising a worm adapted to mesh with said worm-wheel; a quick-return feed forsaid spindle having a driving. connection with said feed-shaft; a friction driving means for said quick-return feed; a detent for holding said driving means from action; a shifting-lever ver and said detent being connected to move simultaneously; and a device actuated by the movement of the drill-spindle under the work-feed for operating said shifting-lever to withdraw said worm from engagement with the worm-wheel; and the detent from the friction driving means.

a drill-spindle; a eed-shaft therefor; a workfeed for said spindle; a worm-wheel loosely mounted on said feed-shaft but 'havin ratchet connection therewith, said workeed coniprising-.a worm adapted to mesh with spindle having a driving connection with said feed-shaft; a friction driving means for said uick-return feed; a detent for holding said givinglneansfrom action; means for adjust ably limiting the effective action of said ing-lever for moving the worm Into and out of engagement with the worm-wheel; and an arm adapted to the feed-shaft under the actionof the Workfeed for actuating said shifting-lever to withdraw said worm from engagement Withthe' wormwhee1 and said detent from the fric tion driving means.

27. In a drilling-machine,; in combination, a drill-spindle; a,feed-shaft therefor; a gear having a slip connection with said feed-shaft, said gear forming part of a-spindle-feed mech-. anism; a second faster spindle-feed mechananism' operatively connected with said feed.-

gear connection of which said gear is 8. part.

28. Ina drilling-machine, in combination, a drill-spindle; a feed-shaft'therefor; a'quickfeed mechanism havinga driving connection with said feed-shaft a gear having a sli con nection with said feed-shaft; a wor -feed mechanism comprising a movably-supported shaft and a gear on said movably-supp'orted shaft adapted to mesh with the gear on said feed-shaft and means whereby sald movablysupported shaft is moved to separate said gears.

29. a drill-spindle; a feed-shaft therefor; a quickfeed mechanism having a driving connection with said feed-shaft a gear having a slip connection with said feed-shaft; a ivotallymounted shaft carrying a gear a apted to mesh with said first-mentioned gear; means for rotating said pivoted shaft; and means whereby said pivoted shaft is pivotally moved to separate said gears.

said worm-wheel a quick-return feed fdi said In a drillingmachine, in combination,

for moving the worm into'and out-of engagement with the worm-wheel, said shift1ngle 8o 26. In a drillin -machine, in combination,

quick-return feed on the drill-spindle; a shiftbe moved by the rotation of shaft and automatic means for breaking the y 30. In a drilling-machine, in combination, I means whereby said pivotally-supported 5 adrill-spindle; afeed-shaft therefor; aquwkshaft is moved to separate said Worm and I '1 feed mechanism geared to said feed-shaft; a worm-wheel.

Worm-wheel having a slip connection with I v r I 5 said feed-shat t; a Work-feed mechanism com- BENTAMH.

a Worm adapted to mesh with the Worm- H. \V. BECK, Wheel on said feed-shaft; and automatic L. L. MILLER.

i prising a pivotaHy-supported shaft carrying \Vitnesses:

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