US592048A - Drill-press - Google Patents

Description

(No Model.) 2 Sl1eetsSheet 1.

H. DRESES.

DRILL PRESS.

No. 592,048. I Patented Oct. 19,1897,

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(No Model'.) 2. SheetsShe et 2.

H. DRESES. DRILL PRESS.

No. 592,048. PatentedOct. 19,1897.

m: nunms PETERS ca. PHOYO-LITNQ. WASNINGTGN. 1:. c4

Nrrnn STATES PATENT FFEEC- HENRY DREsns, or CINCINNATI, OHIO.

' DRILL-PRESS.

srnorrrcn'rroiv formingpart of Letters meant. 592,048, dated October 1 9, 1897. Application filed January 22,1897. Serial No. 620,179. (No inodel.)

To all whom it may concern:

Be it known that I, HENRY DRESES, a citizen of the United States, residing at Gincin nati, Hamilton county, State of Ohio, have inventedcertain new and useful Improvements in Drill-Presses; and I do declare the following to be a clear, full, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same,attention being called to the accompanying drawings, with the reference numerals marked thereon, which form a partof this specification.

This invention relates to improvements in drill-presses, particularly of that type known as radial d comprises .new as well as improved parts, means, and devices for the purpose of controlling and regulating all motions of the drill-spindle.

More specifically my invention comprises new and improved means and constructions whereby the drill-spindle 'is started, stopped,

and rotated with two speed changes and reversed in tapping and threading at a speed quicker than the'f orward motion. A particular feature of this part of my invention is a single lever whereby all these motions are controlled. Y

Another special feature of my invention is a construction whereby two additional changes of speed are provided for the power-feed, which speed changes are independent of those controlled by the lever first mentioned.

Still other parts of my invention relate to means whereby the power-feed is disconnect ed in two ways and'whereby the spindle may correspondingly be moved'by hand in two ways. A pa rticular feature of this part of my invention is a plurality of hand-levers arranged in form of a pilot-wheel, all of which act in the same manner and are used during ordinary operation of the machine for purposes of controlling independently the powerfeed in a most direct and convenient way since one of the said arms is almost always within reach of the operator.

Of certain details of construction,which will be more particularly referred to, a device which stops the drill-spindle automatically at a certain resistance is the leading one.

In the following specification and particularly pointed out in the claims is found a full radial arm with gear-train at the back of the column. Fig. 5 is a cross-section through the clutch of this gear-train. Fig. 6 is a sectional detail view of the clutch on the pinion-shaft. Fig. 7 is a sectional detail view of the clutch of the gear-train. Fig. 8 is a sectional detail View of the worm feed-shaft; and Fig. 9, in a View similar to Fig. 7, shows a modified construction of the same clutch.

A general description of the main operating parts of the type ofa drill-press as shown will be given first, most of such parts being old, while the new features will be particularly described later on.

In the drawings, 10 is a suitable bed-plate which by means of bolts 11 may be secured to the floor. 12 isthe socket which supports the column 13,from which the radial arm 14. projects, which carries the drill-spindle 15 with the drill-tool 16. Column 18 is capable of rotation in itssocket 12, whereby arm 14, carried by it, receives its radial adjustment. By means of a suitable screw clamping device, operated by a handle 17, this adjustment is secured and maintained.

The work rests on a table 18,.supported on an arm 19, on which it is capable of a limited rotary adjustment in which it maybe locked bya clamping device 21. The hub of arm 19 rests on a shoulder 22, formed on socket 12, upon and around which it has a rotary adjustment, at any point of which it may be locked by operating handles 23 accordingly. Work may also be supported on bed-plate 10, in which case table 18 and arm 19 are swung aside, and further also on a downward exten- In addition to its radial adjustment with column 13, arm 1& has an independent vertical adjustment on the former by means of which it with the drill-spindle may be raised or lowered to suit the height of the work; It is held in its adjusted position by a suitable tightening device operated by a handle 26. For such purpose, the back of arm 1i forms a dovetailed slide 27, which fits and moves on ways 28, extending up and down 011 the front of the column. Motion and power are received by a cone-pulley 29 and by means of a set of bevel-wheels 31, transferred onto an upright shaft Another set of bevel vheels and 31 transfers motion to a short shaft 35, from which, by means of a train of gear-wheels, the motion proceeds to a shaft 36, one end of which is supported in a bearing 37 near the outer end of arm 14,while its other end is carried in a bearing 38, formed by a bracket 39,which is bolted to a collar 41. From this shaft 36 the drill and feed motions for the boringspindle 15 are obtained. Collar 41 is also provided with an inwardly-extending bracket- 42,which supports bevel-wheel 33. Allthese parts with collar 41,wl1ich surrounds the column, are secured to the back of slide 27 on arm l-l, so that, as will be readily seen, the transmission of power to the drill-spindle on arm 1& is never interrupted, no matter in what position of its radial or vertical adjustment this latter is, since all the aforementioned parts move with it and since bevel-wheel 33 by sliding on shaft 32 maintains operative connection intact, motion being transmitted from the latter at any height by means of a groove-and-feather connection.

The construction and arrangement of the gear-train supported in bracket 39 are such that the motion imparted by it to shaft may be changed as to speed as well as direction, all of which forms one of the new features and the details of which will be explained at the proper time.

The motion required for the vertical adj ustment of arm 1i is also obtained from upright shaft 32 and by means of a suitable geartrain 43 transmitted to a screw 4%, supported on column 13 and in a groove between ways 28 at the front thereof. Part of slide 27 at the back of arm 14; is extended rearwardly and forms a nut -;t5, through which the aforementioned screw tl passes for the purpose of transmitting its rotary motion, which is at once converted into a longitudinal rectilinear one for arm 1-1. By means of a suitable shifting device operated by a handle 46, this geartrain is either rendered inactive or operated in a mann er to move arm 14 either up or down.

The drill or boring spindle is carried by a drill-head which in front contains bearings 47 and 48 for it and at the back forms a suitable slide 49, which is fitted onto ways 51 at the front side of arm 11. This manner of support permits the drill-head with the boring-spindle to be moved in or out on arm 14,

'so that the drill may be brought over the exact position where it is to act on the work. For the purpose of so moving the drill-head a screw 52 is provided and seated in the front side of arm 1a in a groove between ways 51 thereof.

From the rearsurface of slide 49 extends a nut into said groove and receives screw 52, whereby the rotary motion of this latter is transmitted to nut 53, and, as to it and the drill-head, converted at the same time into a longitudinallyrectilinear one. The rotation of screw 52 is obtained manually by means of a hand-wheel 51. The drill-head with the boring-spindle are secured in their adjusted positions by a suitable tightening device operated by a handle 55. The drill-spindle is capable of several motions, rotary as well as rectilinear, each in two directions. The rotary motions are for plain boring, for tapping, and for threadingby means of dies. They may be had in two changes of speed, as best suited for either lighter or heavier work. The rectilinear motions are for feedingthat is, advancing the boring or threading tool and returning it. These latter motions are obtained in two ways, first, by hand, and, second, by power, and each again at two rates of speed. The hand motion is generally used where light work of limited depth is done, when the attendant simply keeps his hand on the operating parts and alternately advances and returns them with only a short space of time interveningbetween these motions. Of these two speeds of the hand motion or hand-feed the quicker one, which is responsive almost directly to the hand, is always used for returning the boringtool-that is, lifting it out of the hole which it has drilled. It is also used for adjusting the height of the boring ortappingtoolthat is, bringing it down quick to the work before starting. This raising or lowering adjustment is independent of the vertical adjustment which may be had by moving the whole arm 14, with all its appurtenances, on column 13, and it is used when the distance is so limited as to make a movement of the whole arm unnecessary. The return motion after threading is simply one of reversed rotation of the drill-spindle, the cut screw-thread readily raising the tool. Since no work is done, however, when returning, this motion may be and is of a higher speed as when operating in the other-that is, advancing direction for threading. The construction whereby all these motions in their different directions as well as speeds are obtained, as well as started and stopped, contains the new features of my invention, and will now be explained in detail.

Short shaft 35, which receives its motion from upright shaft 32 by bevel-gear connection 31-, carries two gear-wheels and 57, which mesh into gear- wheels 58 and 59, respectively, and all of which comprise the geartrain previously referred to an d supported in ICC IIC

bracket 39. Gear- wheels 58 and 59 are loosely mounted upon shaft 36, and their hollow hubs contain a suitable clutch device by means of which neither one, or only one at a time, is operatively connected to shaft 36, so that notwithstanding the fact that the driving-wheels 56 and 57 v are simultaneously in engagement with wheels 58 and 59, only one of the latter,

by reason of the interposed clutch, receives and transfers motion to shaft 36, while the other meanwhile simply rotates idly.

Since the proportion of the engaging gearwheels of the two pairs are greatly different, one transmitting a higher,'the other a lower speed, it follows that the driven ones rotate at speeds different from each other, so that shaft 36 may be rotated at eithera higher or a lower speed according to which one of the driven wheels 58 or 59 is by means of the clutch device operatively connected at the time to shaft 36. V

In'tappin g and threading it becomes necessary that the drill-spindle rotate alternately first in one direction, which might be termed the operative one, for cutting the thread, and then in another direction reverse from thefirst for the purpose of disengaging the cutting-tool from the thread. To obtain this reversed motion whensuch work is to be done, the machine is adjusted for it as follows: Engagement between wheels 58 and 56 is first broken byshiftin g the latter to the right, (toward the column,) as shown in dotted lines in Fig. 2, its operative connection with shaft 35 being meanwhile maintained by means of a groove and key. A compound idler consisting of two rigidly-connected gear- wheels 62 and 63, the whole eccentrically mounted on a stud 64 and manipulated by a handle 65, is then thrown in gear ina manner to engage simultaneously idler-wheel 62 with shifted wheel 56 andidler-wheel 63 with wheel 58. Motion is then transmitted from wheel 56 to the compound idler and from the latter to wheel 58. (See, Fig. 5.) Shaft 36, as before, receives again its motion through either one of the driven wheels 58 and 59, according to whichever one is locked to it by the clutch. For cutting thread the slow speed transmitted by Wheel 59 is used. After that, in order to obtain thereversed rotation necessary to return and disengage the tool from the thread just cut, the clutch is operated to lock wheel 58 to shaft 36, when this latter, by reason of thepreviously-interposed compound idler 62 6-3, is rotated in reverse direction. Since no work is done while so returning, between the forward or operative rotations, this return motion is at a speed preferably increased against the speed in the other direction and is obtained by proportioning accordingly the engaging gear- wheels 56, 62, 63, and 58, which are active at the time. g

It is obvious that one idler might be used here only.

The details of construction of the clutch mechanism which I prefer to use and consider as being new are as follows: Each of, the hollow hubs of wheels 58 and 59 is provided with a split ring 66 67, tapering inwardly on a decreasing diameter and forming the female parts of the clutch, being adapted to receive the clutch-cones 68 69. These split clutchrings 66 and 67, straight on their outside, fit loosely into the interior of the hubs they'occupy, until either one of them, by reason of one of the clutch-cones moving into it, is spread suficiently to bind by frictional contact and pressure said hub to the respective The previously loosely-rotating gearwheel is then operatively connected to the latter and since the latterthat is, the cone- 'is operativelyconnected to shaft 36 it follows that said shaft is now caused to rotate. cording to whichever one of gear-wheels 58 or 1 59 is eonn ected to the friction-cone, the speed i of shaft 36 will either be faster or slower.

Thus if cone 69 is moved into the split ring 67 within the hub of wheel 59 motion will be transmitted through the latter by drivingwheel 57 and by reason of the particular proportion of size of these two engaging wheels the transmitted motion will be at a reduced speed. If the other wheel 58 is locked to shaft 36, motion will be transmitted from wheel 56 at an increased speed.

If the cone occupies an intermediate position, gears 58 and 59 revolve simply idly and shaft 36 remains still.

For the purpose of adjusting the clutchcones in a manner to engage either one of the two wheels on shaft 36 or none at all these cones, which are preferably connected to move together, are mounted upon shaft 36 in a manner to have a lengthwise movement which is independent of and does not interfere with their operative connection for purposes of rotation and which connection is by sliding key and groove. For so moving the cones either way they are connected to a rod 71 by means of a pin 72, therod being loosely carried within shaft 36, which is partly hollow, and said pin projecting through slots therein. Rod 71 is extended a sufficient distance forward to permit attachment of an opcrating-lever 73 in a position convenient for the operator. This lever is located in front of column 13 and projects out from arm 14 on the same side where the latter carries the drill-head with all the other operating parts. It is pivotally supported in any suitable manner, preferably by a link on a bracket 7 O, and

connects to-rod 71 by means of a flanged ring 74, which in turn connects to said rod by means of a pin 75, reaching through slots 76 in the shaft. Said bracket projects from collar 41 and forms also an additional bearing for shaft 36. The lever, by embracing. ring 7 L between its flanges, leaves the latter free to rotate with shaft 36, but makes it susceptible to any lateral movement imparted by said lever and thereby also moving rod 71 with the friction-cones accordingly.

To prevent unnecessary wear, caused by clutch- rings 66 and 67 involuntarily rotating with gears 58 and 59 when these latter are rotating idly, causing possibly shoulders to appear which might interfere with the operation, such rotation of the rings is prevented by suitable projections engaging them with the cones. In this case keys 7 7 are provided on the latter which project into the spaces between the split ends of the rings. In Fig. 9 a modified form of this clutch is shown, which, however, since it performs the same function in substantially the same manner, is for all purposes and intents the full equivalent. The parts are simply reversed in this way, that instead of having the sliding part of the clutch forming the male members or cones thereof such sliding member forms the female parts and contains the split rings G0 07, thus taking the place of the hollow hubs of wheels 58 and 59. The male parts are then formed by said hubs, which are coneshaped on their outside. As is understood now, by means of this clutch device shaft 36 may be started or stopped, rotated at a slower or faster speed in one direction according to whether it is driven by gear 57 or 50, or its rotation may be reversed to provide the return motion required in threading, which motion is obtained by a compound idler interposed for that purpose, and which motion is also at a higher rate of speed than the one available and used at the time to operate the spindle in the other direction for cutting and power which is transferred from it to the drill-spindle 15 is therefore subject to all these possible conditions and changes of speed. This transfer is by means of bevel-wheels 7S, upright shaft 79, and gear-wheels 81 and 82, the latter mounted on the drill-spindle 15.

Upright shaft 79 is supported in bearings 83 and 84:, the first formed in an arm extending rearwardly from the top of the drill-head and the latter formed on a bracket 85, bolted to the rear side of the slide of the drill-head near the lower edge thereof, from which it extends rearwardly and upwardly. It also embraces shaft 36,but only for purposes of aiding parts in retaining position and alinement and has no further operative connection with it. It is, however, operatively connected to bevelwheel 80 in a manner to cause it to keep in mesh with the other bevel-wheel 78 by moving with the drill-head when the latter is adjusted on arm 14. This connection is such as to not interfere with its rotation, for which latter purpose operative connection with shaft 36 is retained in any position by means of a groove and sliding key. In this manner drillspindle 15 receives from shaft 36 through shaft 79 all the motions which shaft 36 receives from shaft 35 and which are rotation at two interchangeable rates of speed, either all in the same direction, or with one in a direction reversed to the other, in which case the reversed rotation is of a higher rate of speed than the other.

The vertical n1otions-that is, feed and return motionsare obtained from the drillspindle by means of a belt and belt- pulleys 80 and 87, of which the first may be formed by an extension of the hub of gear-wheel 82, while the other is mounted upon a short shaft 88,whieh finds its bearing in an arm S9,extending out from the upper part of the drill-head. From this short shaft two pairs of gear-wheels 91 92 and 93 9% transfer motion to a wormshaft 95, supported with its upper end in a bearing formed in arm 89 and with its lower end in a bearing formed in an arm 90, extending out from in front of the lower part of the drill-head. While these two pairs of gearwheels are constantly in mesh, motion from shaft 88 to shaft 95 is transmitted by only one pair at the time, the other pair rotatingidly. Since the proportion of size between the two pairs is different, it follows that a change of speed may be had between shafts 88 and 95. This change of speed is independent of that change of speed which is caused by changes of speed of the drill-spindle 15 and transmitted by the belt-pulleys. It is obtained by means of a sliding key 97, which lies flush in a groove of shaft 95 and is provided with a projection 98, which may be shifted so as to engage either one of a'groove 99, provided in the hollow hubs of each of gear-wheels 92 and 9st. One of these gear-wheels,which are otherwise loosely mounted upon shaft 95, is then operatively connected to such shaft and then transmits motion from shaft 88 at a speed corresponding to its proportionate size. For the purpose of so moving this key 97 with its projection 98 it is connected to a collar 101, which surrounds shaft 95 and may be held in its adjusted position by frictional contact or by a spring suitably arranged. This change of speed, like many others of its adjustments, may be made while the machine is in operation without stoppage. Friction against the hand, caused otherwise by rotation of collar 101 when taken hold of, is prevented by a loose knurled sleeve 100.

To prevent a partial simultaneous engagement of the two gear-wheels 92 and or while projection 98 moves from the hub of one into the hub of the other, such projection traverses first a hollow space 102 between the two wheels, so that said projection before it enters one of the grooves 99 is entirely disengaged from the groove in the other wheel.

The worm on worm-shaft 95 meshes into a worm-wheel 103,which is mounted on a pinionshaft 104:, supported in a suitable bearing in the lower front part of the drill-head. The pinion 129 on this shaft may preferably form an integral part thereof and meshes into a rack 105, forming part of a sleeve 106, which surrounds the drill-spindle and is connected thereto in a manner to move it lengthwise or vertically without interfering with rotation. The feed and return motions for the drillspindle are thus obtained from shaft 95 and either one proceeds simultaneously while the spindle rotates.

The motions of the drill-spindle'as to starting, stopping, change of speed, and reversal are all and at the same time controlled by lever 73. In addition to this general control, the feed-motion may, however, be independently controlled in two ways and by two clutch devices, whereby the power-feed may be stopped and started irrespective of the rotation of the spindle, which may still proceed and from which it is obtained. When the power-feed is thus stopped or disconnected by either one of the two ways, the spindle may be fed or returned by hand also in two ways, either faster or slower, all of which is very convenient for purposes of adjustment and doing smallwork of limited depth. One of these clutch devices consists of a hub 107, mounted near the outer or front end of shaft 104 and to which it is connected by a groove and sliding key in a manner to have a positive rotary connection, which at the same time permits a limited sliding movement in or out on said shaft. The inner end of said hub is serrated and forms one of the component faces of the clutch, the other face of which, similarly serrated, is formed on the hub of worm-wheel 103. The two clutch-faces are normally kept in engagement by a spring 108, which acts against a shoulder 109 on a rod 110, all of which are contained within a bore in shaft 104 and the end of which rod, bybeing secured to a cap 111 at the outer end of hub 107, pulls the same inwardly and holds its clutch-face in engagement with the clutch-face on the worm-wheel.

When it is desired to stop the power-feed motion, the clutch-faces are separated by moving hub 107 outwardly, which is done by one of several hand-levers 112, all of which are pivotally secured on a flange 113 on said hub and the inner ends of' which all reach into an annular groove 114, which permitsindependent rotation of shaft 104. This plurality of hand-levers, the operation of any one of which has the same effect and which with hub 107 form a pilot-wheel, is a great adslower power-feed is disconnected, wormwheel 103 revolving simply idly, and the drillspindle may, by means of the pilot-wheel on shaft 104, be operated in a more direct wayas, for instance, raised or lowered quickly for purposes'of adjusting the drill or tapping-tool to the work, feeding by hand, or quick return in boring and drilling. A spring-actuated locking-pin 115, acting as a catch, is provided on hub 107, the point of which enters a depression in shaft" 104 and holds the clutchfaces separated in case such is desired. A light tap against any one'of the arms on the pilot-wheel is sufficient to release the clutchhub, whereupon it is at once drawn inwardly by spring 108 and brings the clutch-faces into reengagement.

The other clutch device for cutting out the power-feed is located on shaft 95, which shaft is really in two parts, the upper part, upon which gear- wheels 92 and 93 are mounted, and the lower part, which contains the worm and is in form of a sleeve surrounding the other part of the shaft. By means of said clutch device these two shaft-sections are either operatively connected to act as one shaft, or disconnected, whereupon the upper shaft-section rotates alone, while the lower section with the worm stands still or may, by means of a hand-wheel 116, be operated for hand-feed, in which case the transfer of motion to the drill-spindle proceeds the same as before-that is, by worm-wheel 103 and shaft 104the only difference being that it is under direct control of the operator.

WVhile any clutch device might be applied here,I prefer to use a friction-clutch which consists of two sections, a'conical part 117, formin g the male clutch-section, and a correspondingly-shaped hollow part 118, forming the receiving or female section of the clutch. It is not material how they are mounted; but I prefer to mount the male part on the wormsection of the shaft, to which it is rigidly con.- nected, while section 118 is mounted on the other part of shaft 95, the connection being by a groove and sliding key in a manner to cause them to rotate together, but permitting, as to section 118, a lengthwise sliding movement on said shaft. This section 118 is provided with a flanged hub 119, which is embraced bya hand-lever 121, pivoted at 122 to the drill-head, and whereby this clutch is opera-ted, having also cuts 120 in its wall to give it a limited spring action when engaging wit-h the other clutch part. lVhile their weight would keep the clutch parts in engagement, it is necessary to provide means to hold them separated in case such is desired. For such purpose any suitable locking device may be provided, one operating by friction to be preferred and which holds lever 121 with the clutch-section connected to it in any position-that is, open or closed.

To recapitulate in condensed form, the means for operating and adjusting the drillspindle are as follows: By lever 73 all motions of the drill-spindle, rotary for boring and threading and up-and-down for feed and return, are controlled. Then in an intermediate position, no motion is transmitted from shaft 35 to shaft 36 by the gear-train supported in bracket 39. WVhen pushed to the left, the larger gear-wheel 59 is locked by the clutch and receives its motion from drivingwheel 57, operating the drill-spindle at the reduced speed. When pushed to the right, the smaller wheel 58 is driven by the larger one 56 and the drill-spindle operated at the faster speed. By disconnecting wheels 58 and 56 and connecting them by the interposed idler 62 63 the drill-spindle is operated in reversed direction. The power-feed is also capable of two independent speed changes according to whether gear- wheel 92 or 94'. is used to rotate shaft 95, and which change is obtained by operating collar 101 correspondingly. It may also be disconnected independently either by the clutch on shaft 10;, by operating one of the hand-levers 112, or by the clutch on shaft 95 by operating lever 121. hen so disconnected, the drill-spindle may be lowered or raised quickly by the pilot-wheel to bring the tool-point down to the work before starting, or to return it thereafter. It may then also be used for handfeed. \Vhen disconnected by lever 121, a slower hand-feed may be obtained through the worm-gear by operating hand-wheel 116.

In practice, for starting and stopping the feed-motion of the drill-spindle independently,without starting or stoppin g other parts and for adjusting the same quickly, the pilotwheel is mostly used, because by having a plurality of hand-levers which all operate in the same way the operator is always sure to find one of them within convenient reach without having to leave or change his place near hand-lever 7 3, so that all operations of the machine may be readily controlled from one position. An outward pull on any one of the levers 112 breaks the connection of the clutch-faces on shaft 104: and holds them disconnected by means of spring-actuated pin 115. A slight tap against any one of them overcomes the resistance of said spring-catch and causes the clutch to snap into reengagement.

To guard against accidents in tapping when the thread-cutting tool has reached the bottom of the previously-drilled hole and which would cause such tool to be twisted off, an automatic release device has been provided, which at a certain increase of resistance causes the engaging clutch-surfaces of the clutch on shaft 36 to slip within each other. Ordinarily the taper of clutch-cones 68 and (39 and clutch-rings 6c and 67 is so flat (about four degrees) that they remain readily in engagement when fully pushed into each other without special means to hold them so. This engagement may, however, be moderated by a screw 1%, adjustably carried 011 lever 73 and projecting out toward the column. It may be so adjusted that it strikes before lever 73 is pushed to the left to its full limit,whereby the degree of frictional contact between friction-cone 69 and friction-ring G7 is also limited, so that at a certain increase of resistance these clutch part-s slip within each other before any damage is done. This refers only to that part of the clutch whereby wheel 59, which transmits the slower speed used for tapping, is locked to shaft 3 It is evident that some of these parts may be used in connection with other devices for similar purposes, which refers particularly to the clutches.

Having described my invention, I claim as new- 1.. In a drill-press, the combination of the drill-spindle, an intermediate driving-shaft for it, and operative connection between the two, a gear-train for actuating this drivingshaft at either one of two different rates of speed, but all in the same direction and an ad justably-supported idler which may be connected with the gear-train in a manner to cause the rotation of the said driving-shaft to be reversed as to one of the speeds to obtain the return motion of the spindle neces sary in threading, which return motion is then at a higher speed than the speed used at the time for the forward motion.

2. In a drill-press, the combination of the drill-spindle, an intermediate driving-shaft 30 for it, and permanent operative connection between the two, a shaft 35 from which this intermediate driving-shaft receives its motion, the transmission being by two sets of gear-wheels of different speed proportions and a shifting device which operates in a manner that either none, or only one of the two sets of gear-wheels transmits motion to the aforesaid drive-shaft at a time, whereby the spindle is capable of being operated at two interchangeable rates of speed.

In a drill-press, the combination of the drill-spindle, an intermediate driving-shaft for it, an operative connection between the two, another shaft from which this intermediate driving-shaft receives its motion, the transmission being by two sets of gear-wheels of different speed proportions, a shifting device which operates in a manner that either none, or only one of the two sets of gearwheels transmits motion to the aforesaid drive-shaft ata time whereby the spindle is capable of being operated at two speeds, and an adjustably-supported idler which when interposed between the wheels of one of the sets of gear-wheels reverses rotation of the drive-shaft.

it. In a drill-press, the combination of a drill-spindle, an intermediate driving-shaft 36 for it, a shaft 35 from which the latter rcceives its motion, two sets of gear-wheels of different speed proportions by either one of which the transmission of motion between these two shafts is effected, a clutch device by which either none or only one of these sets of gear-wheels is engaged to transmit motion at the time and a lever by which the clutch device is operated accordingly.

5. In a drill-press, the combination of a drill-spindle, an intermediate driving-shaft 3G for it, a shaft 35 from which the latter receives its motion, gear-wheel sets 59 57 and 58 and 56 on shafts 36 and respectively, which transmit the motion between the two, one of said gear-wheels having a lateral adjustment by which it may be disconnected from its mate, an adjustably-supportcd idler by which when interposed the transmission between the separated gear-wheels of the set is then accomplished, but in reversed direction, a clutch device by which either none or only one of the two sets of gear-wheels is caused to transmit motion at the time and a lever by which the clutch device is operated accordingly.

6. In a drill-press, the combination with the drill-s'pindle, of an intermediate drivingshaft 36, the two operatively connected, two cog-wheels loosely mounted on shaft 36, a clutch device by which either none, or only one of them may be operatively connected to shaft 36, transmitting in the latter contingency, either a slower or faster speed, each of these cog-wheels being provided for such purpose, with one of the engaging clutchsurfaces while the other complementary clutch-surface for each is carried by an adjustable member and a lever whereby this latter is manipulated.

7. In a drill-press, the combination with the drill-spindle, of an intermediate drivingshaft 36, the two operatively connected, two cog-wheels loosely mounted on shaft 36, inwardly-tapering circular recesses in opposite sides of them, the double cone 68 69 mounted upon shaft 36 in a manner to have a sliding adjustment only, a rod 71 within a bore in shaft 36 rigidly connected near one of its ends to the aforesaid double cone, an operating-lever operatively connected to the other end of rod 71, whereby this latter may be moved lengthwise within shaft 36 in a manner to cause the double cone to engage,eithernone or one only of the recesses in the cog-wheels for the purpose of connecting such cog-wheel temporarily to shaft 36.

8. In afriction-clutch, whereacone-shaped member constitutes one of the engaging parts and a recessed member the other, the combination with these two parts, of an interposed split ring straight on its outside occupying the recessed member and fitted on its inside to the taper of the cone-shaped member, which it is adapted to entirely receive and inclose and a key 77 secured to the cone-.

shaped member and extendinginto the split of the ring to prevent independent rotation of such ring within its recess.

9. In a drill-press, the combination of a radially-supported arm 14, a drill-head with drill-spindle carried thereon, an intermediate driving-shaft 36 operatively connected to the drill-spindle, a gear-train whereby this driving-shaft is actuated, a clutch device whereby either none or only one of different sets of this gear-train may be engaged and an operating-lever supported to project at right angles to radial arm 14 for the purpose of manipulating the clutch device.-

10. In a drill-press, the combination of the drill-spindle, an intermediate driving-shaft for it operatively connected thereto, a geartrain for actuating the latter, a friction-clutch whereby'either none or only one of the different sets of this gear-train may be engaged, an operating-lever for manipulating the friction-clutch, and a projecting pin whereby the frictional engagement of the complementary friction-surfaces may be limited to cause them to slip within each other in case the resistance to the drill-spindle increases beyond a predetermined limit.

11. In a drill-press, the combination with the drill-spindle, of actuating means whereby this latter may be operated at two interchangeable rates of speed, either all in the same direction, or with one in a direction reversed to the other in which case the reversed rotation is of a higher rate of speed than the other, and started and stopped, and a single lever by the manipulation of which all these effects are obtained.

12. In a drill-press, the combination of a drill-spindle, an intermediate driving-shaft 36 for it, a shaft 35 from which the latter receives its motion, gear-wheels 56 57, on shaft 35 engaging with gear-wheels 58 59 respectively, on shaft 36 on which they are loosely mounted, a clutch device and means to operate it, whereby either none or'only one of these cog-wheels is operatively connected at the time to shaft 36 in which latter case said shaft then receives motion from shaft 35, cogwheels 56 and 57 being mounted to be at all times operatively connected for rotation, but capable of a'sliding adjustment to disconnect wheel 56 from its mate 58, a compound idler 62 and 63 capable of adjustment in a manner whereby it mediates the transmission of motion between the separated cog-wheels and means to operate said idler for adjustment.

'13. In a drill-press, the combination of the drill-spindle and means whereby itis rotated, a feed mechanism for it, a driving-shaft 95 for the latter, an intermediate shaft 88 driven from the drill-spindle, the transmission being by belt and a pulley on each, two sets of gearwheels which transmit motion atv two speeds between shafts 88 and 95, the transmission being however by only one set at the time and means to connect or disconnect either one of the sets.

14. In a drill-press, the combination of the drill-spindle and means whereby it is rotated, a feed mechanism for it, a driving-shaft 95 for the latter, an intermediate shaft 88 driven from the drill-spindle, the transmissionbeing by belt and a pulley on each, gear-wheels 91 93 on shaft 88 in mesh with gear- wheels 92, 94 mounted loosely on shaft 95, the engaging sets being of different speed proportions, a sliding key on shaft 95 having a projection 98 adapted to engage a keyway in either one of the loose wheels and a collar to which the key is secured and whereby it may be operated.

15. In a drill-press, the combination of the drill-spindle and means whereby it is operated, a feed mechanism for it, a driving-shaft for the latter which is in two parts one of these partsreceiving the transmitted power, the other being provided with a hand-wheel for manual operation and a clutch device between these two shaft parts whereby the power-driven part may be disconnected from the other to discontinue power-feed and to also permit hand-feed.

16. In a drillprcss, the combination of the drill-spindle and means for rotating it, a rack and pinion whereby it is fed, a shaft for the pinion, power-driven mechanism for rotating the pinion-shaft, means for connecting ordisconnecting the latter from the former and a series of arms or handles forming a pilotwheel for operating these means, and all so connected at their inner ends that actuation of any of them has the desired effect.

17. In a drill-press, the combination of the drill-spindle and means for rotating it, a rack and pinion whereby it is fed, a shaft for the pinion, power-driven mechanism for rotating the pinion-shaft, a clutch device for connecting or disconnecting the latter from the former and a plurality of arms connected to the adjustable part of the clutch device, the connection being such that by operating any one of these arms, the clutch may be manipulated.

18. In a drill-press, the combination of the drill-spindle and means for rotating it, a rack and pinion whereby it is fed, a shaft 10st for the pinion, a worm-wheel loosely mounted upon shaft 10-l, a clutch device of which one of its component parts is connected to the worm-wheel while the other part forms a part of a hub 107 which is operatively connected for rotation with shaft 101, but has an independent sliding movement thereon with a normal tendencyto approach with its clutch part the other clutch part on the worm-wheel and means to manipulate the sliding clutch-hub.

10. In a drill-press, the combination of the drill-spindle and means for rotating it, a rack and pinion whereby it is fed, a shaft 101 for the pinion, a worm-wheel loosely mounted upon shaft 10i, a clutch device of which one of its component parts is connected to the worm-wheel while the other part forms a part of a hub 107 which is operatively connected for rotation with shaft 104:, but has an independent sliding movement thereon, a springactuated pull-rod 110 connected to hub 107 holding it normally in engagement with the clutch part on the worm-wheel and means to manipulate hub 107.

20. In a drill-press, the combination of the drill-spindle and means for rotating it, a rack and pinion whereby it is fed, a shaft 101 for the pinion, a worm-wheel loosely mounted upon shaft 104, a clutch device of which one of its component parts is connected to the worm-wheel while the other part forms a part of a hub 107 which is operatively connected for rotation with shaft 104, but has an independent sliding movement thereon, a springaetuated pull-rod 110 connected to hub 107 holding it normally in engagement with the clutch part on the worm-wheel and a number of levers 112 radially arranged on a flange 113 of hub 107 and pivotally secured thereto, the inner ends of all supported loosely in an annular groove 11% in shaft 10% so that by the manipulation of any one of these levers, the adjustable part of the clutch maybe operated.

21. In a drill-press, the combination of the drill-spindle and means for rotating it, a rack and pinion whereby it is fed, a shaft 101 for the pinion, a worm-wheel loosely mounted upon shaft 101, a clutch device of which one of its component parts is connected to the worm-wheel while the other part forms a part of a hub 107 which is operatively connected for rotation with shaft 104, but has an independent sliding movement thereon with a norm a1 tendencyto approach with its clutch part the other clutch part on the worm-wheel, a spring-actuated locking -pin to hold the clutch-faces separated and means to manipulate the sliding clutch-hub.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

HENRY DRESES.

IV itnesses:

ARTHUR KLINE, OSCAR W. MUELLER.

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