US738344A - Drilling-machine. - Google Patents

Description

N. 738,344. PATENTED SEPT. 8, 1903.

B. F. MOHR. A

yDRILLING MACHINE.

APPLIGATION FILED AUG.19,1902,

No MODEL. 2 SHEETS-SHEET 1.

l THE owns persas co. pHoro-L mo, wAmNmoN, u4 c i No. 738,344. PATENTBD SEPT. 8, 1903, B'. P. MQHR. DRILLING MACHINE.

APPLICATION FILED AUG. 19, 1902.

N0 MODEL. v2 SHEETS-SHEET 2.

lov

ivo. 738,344.

Patented September 1903.

PATENT OFFICE.

BENJAMIN F. MOHR, OF MIFFLINBURG, PENNSYLVANIA.

DRILL'lNe-MACHINE.

SPECIFICATION forming part of Letters Patent No. 738,344, dated September 8, 1903. Application filed August 19, 1902. Serial No. 120,252. (No model.)

To all 4l1/1,0m, it 77mg/ 0071/067177,.-

Be it known that I, BENJAMIN F. MOHR, a citizen ot' the United States, residing at Mifilinburg, in the county ot' Union and State of Pennsylvania, have invented a new and useful Drilling-Machine, ot which the following is a specication.

This invention relates to a novel automatic drilling machine or press having a screw-feed for the drill-spindle; and the primary object in View is to provide efficient and compact mechanism for reversing the feed automatically and per-mitting the reversal of the feed by hand.

A further object of the invention is to provide means actuated by the drill-operating handle or crank to stop the feed at any desired point and to inaugurato the comparativelyrapid return movement of the drill, which movement is reversed to restore the positive feed ot the drill by means ot adjustable trip mechanism, which can be set to ar` rest the return movement andA recommence the feed when the drill-spindle has reached any desired elevation.

In its more specific aspectthe invention relates particularly to that class of drilling-machines employed by blacksmiths and carriagemakers and commonly known as blacksmiths drills, which type of drills is characterized by a heavy cast frame adapted to be bolted to a vertically-disposed supporting` surface and carrying a revoluble drill-'spindle operated by suitable actuating mechanism and fed toward the work by the step-by-V step rotation of the feed-screw, and it should be understood that any drilling-machine of different typeembodying the characteristics -mentioned may be equipped with feed-regulating mechanism constructed in accordance with my invention.

To the accomplishment of the several objects noted and of others which will more fully appear hereinafter, the preferred embodiment of my invention consists in the novel construction and arrangement ot parts fully described inthe subjoined description, illustratedin the accompanyingdrawings,and embraced within the scope of the appended claims.

Referring to said drawings, Figure lis a perspective view of my drilling-machine comdle-bar.

` trip-plate.

plete. Fig. 2 is a central vertical section through the subject-matter of Fig. l, certain of the interior parts beingshown in elevation. Fig. 3 is an elevation of a portion of the machine, on a somewhat enlarged scale, looking toward the rear side of the main gear-Wheel, with the handle and its socket removed, this view being particularly designed to show the relation of the feed-leverto its actuating-cam. Fig. 4 is a detail View ot' the handle-socket, showing the arrangement therein of the han- Fig. 5 is a detail sectional View on the line 5 5 ot' Fig. 4, the catch of the revers- Ving-cam being shown in position to retain the cam and reversing-bar in position to hold the yreversing-plate out of engagement with the feed-nut to eiect the return of the spindle. Fig. 6 is a detail elevation, partly in section, illustrating the relation` of the trip-plate to the latch of the reversing-cam. Fig. 7 is a detail sectional view of the mounting of the Fig. 8 is a detail sectional View, on asomewhat enlarged scale, illustrating the relation of the reversing-plate to the feednut and to the pawl `or detent which effects the connection between the feed-nut and spindle during the return movement. Fig. 9 is a View similar to Fig. 8, but showing the reversing-plate disengaged from the feed-nut and the detent in engagement with the spindle. Fig. 10 is a detail sectional view illustrating the arrangement of the spreader for the split sleeve of the work-table.

Referring to the numerals ot' reference employed to designate corresponding parts in `the several views, l indicates the drill-supporting frame, designed, as usual, to be bolted to a vertical supporting-surface and having the vertically-alined bearings 2 and 3, through which extends the drill-spindle 4, Awhich carries at its lower end the usual chuck or holder 5 for the drilling-bit o', movable toward and from the vertically-adjustable work-table 7. The upper end of the spindle 4 is reduced, and upon the reduced portion 8 is revolubly mounted an elongated hollow feed-screw 9, passing through the internally-threaded feednut l0, rotatably mounted in the upper bearing 2 and held against longitudinal movement by an annular flange ll, bearing against the under side of the bearing 2 and a feedwheel 12, abutting against the opposite side of the bearing and having its hub rigidly connected to the upper end of the feed-nut10- as, for instance, bya set-screw 13. The feednut may therefore be rotated in its bearing to impart a downward movement or feed to the hollow feed-screw 9 by reason of the thread connection between the screw and nut. A variety of devices may be employed for imparting this rotary movement to the feed-nut; but I prefer to provide the feed-wheel 12 with an annular rim extending above the web of the wheel to form what may be termed a gripiiange 14 and below the web to define a depending annular brake-Harige 15, to which latter a retarding element is applied, as will hereinafter appear, for the purpose of opposing greater friction to the rotation of the feed wheel and nut than is opposed to the relative movement of the nut and feed-screw by the engagement of the threads. To the upper extremity of the reduced end 8 of the spindle is secured, as by a set-screw 16, the hub 17 of a comparatively heavy balancingwheel 18, the purpose of which is to balance the rotary movement of the spindle in a manner well understood in the art, and its hub serves, further, to confine the feed-screw 9 against the shoulder 19 of the spindle to insure the longitudinal movement of the spindle with the feed-screw as the latter is advanced or retracted by the rotation of the feed-nut.

The spindle 4 is provided with afixed head 20, which encircles it immediately below the lower end of the feed-screw, at which point the latter is provided with a notched disk 21, and between the disk 21 and head 2O is provided an antifriction-bearing by theinterposition of bearing-balls 22, which take up the thrust of the spindle against the feed-screw and permit relative rotary movement of the spindle and screw with little or no friction. For the purpose of imparting the necessary rotary movement. to the spindle I key thereon immediately above the bearing 3 a beveled pinion or hub wheel 23, meshing with a comparatively large bevel gearwheel H24, screwed upon the inner end of a hollow shaft 25, revoluble within the-elongated horizontally-'disposed bearing 26, cast with the frame 1 and located to one side of the bearings 2 and 3 and approximately midway between them. To the outer end of the hollow shaft 25 is fixed, preferably by engaging threads, what I shall term the handle-socket 27, which carries the handle-bar 23, having the handle 29 at one end and constituting, in effect, an actuating-crank for the application of power to rotate the spindle 4 through the table 7 as the drilling operation progresses. For this purpose I provide a grip comprising a pair of pivoted jaws 30 and 31, having roughened gripping-faces upon opposite sides of the gripping-flange 14, one of said jaws having an extended shank or arm 32, constantly urged in one direction by a spring 33 and designed to be actuated in opposition to the spring by an oscillatory feed-lever 34, having a terminal stud 35, projecting upwardly through an aperture in the shank 32 and provided at its lower extremity with a bearing-disk 36, abutting against a boss 37, cast upon the bearing 3. From this boss, which is located at the side of the bearing opposite the handle, extends a bolt or stu'd 38,

constituting a fulcrum for the bearing-disk 36 of the feed-lever and carrying a nut and washer for the purpose of preventing displacement of the latter. The oscillation .of

the feed-lever 34 from the stud 38 causes the j gripping- jaws 30 and 31 to frictionally grip the iange 14 and to impart a partial rotation to the feed-wheel for the purpose of rotating the feed-nut, and thereby feeding the feed-screw and spindle in a longitudinal direction, as heretofore noted, the arrangement of the jaws being such that the return movement of the gripper under the influence of the feed-lever is accomplished with the jaws out of engagement with the Hange 14, which they again grip for the purpose of imparting a step-by-step feed as the feed-lever is progressively oscillated.

A preferable manner of imparting the necessary oscillatory movement to the feed-lever-34 is by casting upon the back of the gear-wheel 24 a double feed-cam 39, against which rides a roller 40 at an intermediate point upon said lever, the stroke of the latter being regulated by an adjustable stop 41, screwed through an apertured lug 42 upon the lever and designed by abutting against the bearing 26 to limit the movement of the lever in one directionthat is to say, in the direction of its retraction-the limit of movement in the opposite direction being of course defined by the greatest diameters of the feed-cam.

We have now seen in what manner therotation and feeding of the spindle is effected, and it now appears to bein order to describe in what in an ner the quick return or elevation of the spindle is effected automatically orl manually without-interrupting the operation of the mechanism employed for the purpose of rotating the spindle during the operation of drilling and for the purpose of accomplishing its return movement. Attention has vbeen called-.to the fact that the downward `movement or feed of the spindle is produced by the relative rotation of the feed-nut and feed-screw-that is to say, the feed-screw be- IOO IIO

feed-screw to rotate with the spindle the relative movement of the feed-nut and screw will be in a direction opposite to their relativo movement when the screw is retained and the nut is rotated. Consequently the connection of the screw and spindle and their rotation will eect the return of the screw and spindle to their normal positions. For the purpose of providing for this synchronous rotation of the screw and spindle to return the bit and for permitting their independent rotationduring the feeding of the latter I form the notch or rest 43 in the edge of the disk 2l, said notch being designed for the reception of the front edge of a swinging feedreversing plate 44, having trunnions 45 in line with its rear edge and supported Within bearings 46, cast upon the frame l. The reversing-plate is retained in itsengaged or disengaged position-that is to say, in engagement with the notch 43, as shown in Fig.`

8, or out of engagement therewith, as shown in Fig. 9--by a spring 47, having one end en-` gaged within a spring-socket 48, extending from the rear edge of the plate 44, and having its opposite end passed through the vertical web of the frame 1 and disposed against the base-plate of the frame, this particular arrangement serving to effect the retention of the plate 44 in either position by reason of the fact that the connection of the spring to the plate is eccentric to the axis of movement of the latter. 49 indicates a handle extending from the front edge of the plate 44, by means of which the operator may swing the reversing-plate into or out of engagement with the disk 21, and thereby retain the feed-screw against rotary movementtor permit its rotation with the spindle.

In order to automatically connect the feedscrewand spindle when the reversing-plate is thrown back and to break such connection when the plate is thrown intov engagement with the disk, I form the head 2Ol with an annular series of ratchet-teeth 50, designed to be engaged by a pivoted detent or pawl 5l, mounted upon the under side'of Ythe disk 21 and having a notched tailpiece 52, normally urged outwardly by a spring 53 and extending beyond the inner face of the notch 43 when the pawl is in engagement with the teeth toeft'ecta coperative connectionbetween the feed-screw and spindle, as shown in Fig. 9 of the drawings. This relation of the tailpiece 52 of the pawl or detent causes the detent to be swung out of engagement with teeth 50 when the plate 44 is swung into engagement with the disk 2l, so that the reversing-plate not only retains and releases the feed-screw, but breaks and makes the connection between the feed-screw and spindle when operated to effect such retention and release.

.Assn ming the parts to be in the relative positions illustrated in Fig. 1 of the drawingsthat is to say, with the reversing-plate engaging the disk 2lthe rotation of the crank or handle 29 will impart rotary movement to '27, which supports it.

'the spindle independently of the feed-screw;`

but the feed-screw will be advanced longitudinally to feed the bit forward by the stepby-step rotation of the feed-wheel actuated in a manner specified through the oscillation ot the feed-lever. As soon as the hole has been drilled through the metal object supported upon the work-table the operator,with out discontinuing the rotation of the crank, strikes the handle 49 of the reversing-plate to swing the latter out of engagement with the disk 21 upon the feed-screw. The Withdrawal of the plate simultaneously releases both the disk 21 and the tailpiece of the detent 5l, permitting the detent to engage the teeth 50 of the spindle-head `for the purpose of rotating the feed-screw with the spindle to accomplish the rapid return movement of the screw and spindle in an obvious manner. Vhen the return movement has been com pleted, the feed is again started without interruption of the actuating mechanism by again throwing the reversing-plate into engagement with the disk and simultaneously retaining the feed-screw against rotary movement and disengaging the detent 51 from the spindle-head to permit the independent rotary movement of the spindle.

The machine as thus far described comprehends a complete embodiment of my invention in its broadest aspect, since it includes a spindle carrying a bit and means for controlling the direction of longitudinal movement of the spindle to effect its feed or return Without interruption 0f the powertransmitting mechanism; but I prefer to employ a further development of the invention comprehending mechanism for automatically reversing the plate through the manipulation of the operating-handle to discontinue the feed and begin the return .movement and adjustable trip mechanism operated by the longitudinal movement of the spindle to automatically discontinue the return movement and recommence the feed by throwing the reversing mechanism into engagement with the feed-screw without attention on the part of the operator. i

To the accomplishment of the desired object, I mount the handle-bar 28 to have limited independent movement upon the socket This' independent movement is preferably obtained bypassing IOO IIC

IIS

one end of the bar through a staple 54 at one end of the socket and through a slightly-elongated loop 55 at its opposite end, the bar being longitudinally adjustable for the purpose of regulating thel length of the crank-that is to say, the distance between the handle 29 and the shaft 25--by loosening the staple 54 toaccommodatetheadjustment and byscrewing up its nutsl 56 when the desired adjustment has been attained. The handle-bar is held away from the face of the socket by lugs 57, extending from the face of the latter, and, as Will be obvious, said handle-bar is capable of limited independent movement guided within the shaft 25.

within the limits definedKA by the loop 55. This movement of the handle-bar independent of the socket is utilized for the actuation of a feed-reversing cam 58, located between the handle-bar and the face of the socket and urged away from the latter by a spring 59, seated in a spring-recess 60 in the face of the socket and bearing at its opposite end against the laterally-extending lug 6l of a pivoted latch 62, carried by the reversing-cam 58 and extending through an aperture 63 in the socket to permit its beak 64 to engage with the rear side thereof when the cam is urged against the face of the socket by the rearward movement of the handle-bar. It will therefore be seen that the spring 59 serves a double function-namely, the actuation of the latch to effect its engagement when the cam is forced toward the socket by the lever and to actuate the cam-that is to say, to urge it back to its normal position when the latchis tripped, in a manner to be explained. The particular manner of mounting the cam upon the socket is not essential; but I prefer to form it with a sharpened bearing-lug 65, at one end engaging a bearing-recess 66 in the face of the socket, and at its opposite end with a horizontally-disposed stud 67, which extends into the outer end of the hollow shaft 25 into operative proximity with the outer end of the reversing rod or plunger 68, The opposite end of the rod 68 extends beyond the gearwheel 24 and is deflected around the spindle to bring its extremity into operative relation with the handle 49, which is preferably provided with an aperture or depression 69 to insure the elective engagement between the reversing-rod 68 and the reversing-plate 44.

During the feed of the spindle the handlebar 2S is disposed at the forward side of the socket, as shown in Figs. 1 and 2, and the reversing-cam 58,undertheimpulseofitsspring 59, is thrown back a sufficient distance to permit a position of the reversing-rod 68 which will allow the engagement of thereversing-plate 44 with the disk of the feedscrew. When the desired limit of the feed is reached, the operator, without interrupting the operation of the actuating mechanism, merely retards the forward movement of the handle 29 to shift the handle-bar in its socket, this relative movement being effected by the continued motion of the socket during the retention of the handle. The shifting of the handle-bar from the position shown in Figs. l and 2 to that shown in Figs. 4 and 5 causes. it to ride upon the cam-face 70 of the cam 58 to force the latter toward' the socket. The movement of the cam, under the impulse of the handle-bar and in opposition to the spring 60, brings the stud 67 into contact with the outer end of the reversing-rod 68, which is shifted longitudinally to swing the reversing-plate 44 out of engagement with the disk 2l, thereby stopping the feed and inaugurating the return movement of the spindle in the manner hereinbefore explained. This movement of the reversing-rod is not suiiicient, however, to cause the spring 47 to hold the reversing-plate disengaged, but is merely sufficient to hold the plate 44 in its disengaged position against the resistance of the spring 47. The throwing in of the cam brings its latch 62 into position to permit the spring 60 to swing the beak 64 of the latch into engagement with the rear side of the handle-socket, as shown in Fig. 5, and continuedforward pressure upon the handle 29 will therefore remove it from the cam-face 79 to free the cam, which will be retained, however, by the engagement of the latch with the socket. Continued operation of the machine in the direction which originally effected the downward feed of the spindle will effect the return movement of the latter until the plate 44 is again permitted to engage the feed-screw by the release or tripping of the latch 62, which will permit the spring 59 to throw back the cam-58, which will permit the reversing-plate to be swung into engagement with the notch 43 under the impulse of the spring 47.

The tripping of the latch may be effected in a variety of ways; but l have shown a simple form of adjustable tripping mechanism which may be readily adjusted to effect the tripping of thelatch and the consequent termination of the return movement ofthe spindle when the latter has reached any desired elevation. This mechanism comprises a pivoted trip-plate 7l, mounted upon a bolt 72, passing through the frame just below the bearing 26. The tripplate is normally located in a depressed position out of the path of movement of the latch 62, butis capable of being swung into the path ofthe latch for the purpose of tripping the latter by what may be termed a trip-plate actuator 73, adjustably connected to the plate by a friction-clamp 74, and provided at its lower extremity with a circular guideloop 75, which surrounds the spindle and is designed to be elevated by the chuck or holder 5 to raise the trip-plate into the path of the latch at the desired elevation of the spindle. The adjustable connection between the tripplate and its actuator makes it possible to locate the lower end of the actuator at any desired point below'the sleeve 3' to automatically effect the termination of the return movement of the bit in accordance with the thickness of the object being operated upon. For the purpose of providing against breakage or derangement in the event of the drillhandle being rotated in the wrong direction the trip-plate 7l is mounted to yield bodily by elongating the bolt 72 and interposing a spring 76 between its head and the adjacent face of the plate, so that the spring, while serving to hold the plate against the frame, permits it to yield when the latch is brought against it from the wrong direction.

To provide for the hastening of the speed when advancing the bit to the work,l prefer IOO IIO

IZO

.transverse bolt 89.

to provide a hand-wheel 77,1'igid with the feed- Wheel, so that the latter may be manually rotated more rapidly than is possible with the automatic feed mechanism described. I have heretofore stated that the brake-flange l5 of the feed-wheel is provided for the application of a retarding element which will prevent the rotation of the feed-nut With the feed-screw during the return movementin the event of the frictional engagement between the threads being greater than the resistance opposed to the rotation of the feednut within its bearings. This retarding element may be arranged and actuated in any desired manner; but inasmuch as it is only intended to be in engagement with the brakeflange when the reversing-plate 44 is out of engagement with the feed-screw I extend the plate a sufficient distance to bringits upper extremity 7S into operative relation with the brake-flange, which latter, in addition to its function as an element of the retarding mechanism, serves to limit the movement of the plate in one direction.

The foregoing is a complete description of my drill in so far as the mechanism for controlling and operating the spindle is concerned; but I have devised a novel construction of Work-table and 'table-supporting post, which elements are best illustrated in Figs. 1 and l0 of the drawings. At the lower end of the frame l I cast a circular post-socket 79, in which is formed an annular groove 80 and from the center of which depends a reduced core 8l,screwthreaded upon its lower extremity. The hollow post 82 for the work-table is slipped over the core Sl,and its upper edge is tted into the annular groove SO in the postsocket 79. The split sleeve or collar S3 of the work-table S4 is then slipped upon the post 82, and the lower socket 85 of the post is then drawn up against the lower end of said post by a nut 86, screwed upon the lower end of the core 81. The work-table is formed, as usual7 at one end of one pair of parallel plates 87 and S8,which are connected by the integral split collar 83, the plates being pierced by a My improvement, so far as this particular feature of the machine is concerned, resides in mounting an adjustinglever 90 upon the bolt 89 and in providing said lever with a spreader 91, extending from one side of the lever and carried between the plates 87 and S8,where its end is pierced by the bolt 89. The contiguous faces of the plates 87 and 8S are angularly related, and it will therefore be seen that the swinging of the adjusting-lever 90 forces the spreader between the plates of the work-table with a wedging action, which causes both of said plates to yield laterally, thereby spreading the collar 83 and permitting the work-table to be adjusted upon the post 82 to accommodate the character of work to be operated on. After the adjustment is secured it is simply necessary to depress the lever 90, which withdraws the 'spreader from the'constricted portion of the space between the plates to permit the sleeve or collar to grip the post and retain the work-plate in its adjusted positions. It is also intended that the lever 90 shall exert more or less force when depressed to urge the split collar 83 into engagement with the post. For this reason the upper end of the lever 90 is Vformed with a cam-face 90, bearing against the side ofthe plate 88. When the lever is drawn up, the face 90 moves to such position that 'the separation ofthe plates 87 and 88 by the action of the spreader is made possible. When, however, the lever is depressed, the spreader is withdrawn from its wedging position, as above stated, and at the same time the inherent -resiliency of the split collar 83 is augmented by the wedging act-ion of the cam-face 90 of the lever 90 serving to draw the plates 87 and 88 together.

As a desirable feature of construction the thread connection between the shaft 25 and the gear-wheel 24 is formed by cutting a series of parallel threads on the shaft instead of one continuous thread, as this peculiarity produces a large number of individual hold- `ing-su rfaces of great pitch Without producing the objectionable wedging of the connection which would result from a continuous thread progressing only the width of a single thread in a complete convolution. 4

From the foregoing it will be seen that the operator may by the manipulation of the handle impart to the tool-spindle the desired rotary motion and longitudinal feed and that he may, furthermore, without interrupting the operation of the drill and by slight movement of the operating-handle independentof its socket stop the feed and inaugurate the return movement, the latter being terminated and the feed reinaugurated automatically at any desired point; also, that the feed and return movement may be inaugurated and terminated. at will by the manipulation of the reversing-plate.

I wish. it to be understood that various structural modifications may be effected without departing from the spirit of the invention, and I therefore reserve the right to make such changes in matters, forni, proportion, and arrangement as may appear eX- pedient in adapting the mechanism for use in various connections.

Having thus described the invention, what is claimed, and desired to be secured by Letters Patent, isi l. In a drilling-machine, the combination with a spindle, of an operating member, connections between the operating member and the spindle for rotating the spindle and for moving Vit longitudinally in opposite directions, said operating member having limited movement independent of the spindle, and means for reversing the longitudinal movement of the spindle when such independent `movement is imparted to the member.

2. In a drilling-machine, the combinationA IIO with a spindle, and means for imparting endwise movement thereto, of an operating-handle for rotating the spindle and for operating said means, and having limited movement independent of the spindle, means for reversing the direction of the longitudinal movement of the spindle, said means being operatively related to the handle for actuation when such independent movement is impartedV to the latter.

3. In a drilling-machine, the combination with a spindle, of an operating-handle, connections between the handle and spindle for rotating the spindle, and also for feeding said spindle toward the work, reversing means for reorganizing the connections to effect the return of the spindle, said handle havingfor throwing the other of said mechanisms into operative relation with the spindle, and means for automatically restoring the original relation of said mechanisms to the spindle.

5. In a drilling-machine, the combination with a tool-spindle, feed mechanism therefor, and reversing mechanism for returning the spindle, of an operating-handle for driving the spindle and capable of limited movement independent of the spindle, means operated by the handle during such independent movement thereof to throw the feed'mechanism ont of operative relation with the spindle and to throw the reversing mechanism into operative. relation therewith to effect the return 1 of said spindle, and means for automatically restablishing the original relation of said mechanisms for the purpose of reinaugnrating the feed of the spindle in any desired position of the latter.

6. In a drilling-machine, the combination with a tool-spindle, and a feed-screw retained against rotary movement, of means for advancing the feed-screw to feed the spindle,

an operating member for rotating the spindle and having limited movement independent thereof, and means operated by said member during its independent movement to release the feed-screw and to effect its rotation with Vthe spindle to return the latter.

7. In a drilling-machine, the combination with a tool-spindle,and a feed-screw connected thereto but permitting independent rotary movement of the spindle, of a feed-nut, means for rotating the feed-nut to advance the'l feedscrew, an operating member for rotating the spindle and movable independently thereof, and means operated by said member during its independent movement to connect the feed-screw and spindle and thus effect the rotation of the screw and the return of the spindle.

8. In a drilling-machine, the combination with a rotary spindle,a feed-nut, and a feedscrew engaging the nut, of a reversing device retaining the feed-screw against rotary movement, means for rotating the feed-nut to advance the feed-screw, means controlled by the reversing dev-ice for connecting the feedscrew to the spindle to rotate said feed-screw when it is released by the reversing device, a handle for rotating the spindle and movable independently thereof, and an operating connection between the handle and the reversing device. y

9. In a drilling-machine, the combination with a tool-spindle, of a feed-screw longitudinally movable therewith but permittingindependent rotary movement thereof, a feednut engaging the screw, means for imparting a step-by-step rotation to the feed-nut to advance the feed-screw and spindle, a'detent connecting the screw and spindle to cause the yScrew to rotate with the spindle, and a reversing-plate arranged to be moved into engagement with the feed-screw to retain the latter againstA rotary movement and to operate the detent to disconnect the screw and spindle and thereby reinaugurate the feed.

10. In a drilling-machine, the combination with atool-spindle, and a feed-screw provided with a notched disk -and longitudinally movable with the spindle 'during the feeding thereof, a detent carried by the disk to en gage the s pindle and having a tailpiece in the plane of the notch in the disk, a pivoted reversing-plate designed to be thrown into engagement with the notch in the disk and to strike the tailpiece of the detent, a feed- .nut engaging the feed-screw, and means for rotating the spindle.

1l. In a drilling-machine, the combination with a tool-spindle, a feed-screw and a feednnt, of a detent for connecting the screw and spindle, a reversing-plate for arresting the rotary movement of the feed-screw and for operating thedetent to permit independent rotation of the spindle, an operating-handle for the spindle, said handle having limited movement independent of the spindle, means for operating the reversing-plate to arrest or release the feed-screw and to operate the detent, and other means for operating the reversing-plate from the handle.

l2. In a drilling-machine, the combination with a tool-spindle, a feed-screw, a feed-nut, and means for actuating the nut, of a detent connecting the feed-screw to the spindle, a reversing-plate arranged to arrest the rotary movement of the feed-screw and to operate the detent to disconnect the screw and spindle, an operating handle for rotating the IIO . spindle, a reversing-cam in operative relation to the handle, and a reversing-rod in opcra` tive relation to the reversing plate and cam and designed to operate said plate lo reverse the direction of the longitudinal movement of the spindle when the reversing-cam is actuated by the operating-handle.

13. In a drilling-machine, the combination witha tool-spindle, feed mechanism therefor, and reversing mechanism for returning the spindle, of an operating-handle for rotating the spindle and movableindependently thereof, a reversing-cam disposed for actuation by the handle during the independent movement of the latter, and means operated by said cam for effecting an operative connection between either the feed mechanism or reversing mechanism and the tool-spindle.

14. In a drilling-machine, the combination with a tool-spindle, an operating-handle, feed mechanism, and a reversing device, of a latch associated with the handle for retaining the reversing device in one position, and adjustable trip mechanism for tripping the latch through the movement of the spindle.

15. In a drilling-machine, the combination with a tool-spindle, feed mechanism therefor, and reversing mechanism for returning the spindle and including a reversing-plate, of an operating-handle for rotating the spindle, means operated by the handle for moving the reversing-plate, said means comprehending a latch, and adjustable tripping mechanism for tripping said latch through the movement of the spindle.

16. In a drilling-machine, the combination with a tool-spindle, feed mechanism, and reversing mechanism including a reversingplate, of an operating-handle for rotating the spindle and capable of limited independent movement, a reversing-cam in operative relation with the handle and provided with a latch, means for operating the reversing-plate through the movement of the reversing-cam, a movable trip-plate, and a trip-plate actuator operated by the movement of the spindle to advance the trip-plate into the path of the latch.

17. In a drilling-machine, the combination with a tool-spindle, feed mechanism, and reversing mechanism including a reversingplate, of a latch retaining the reversing-plate in one position, a trip-plate arranged to be moved into the path of the latch, a trip-plate actuator adjustably connected to the tripplate and extended into operative relation with the spindle, and means for rotating said spindle.

18. In a drilling-machine, the combination with a tool-spindle, feed mechanism therefor, and reversing mechanism for returning the spindle and including a reversing-plate, of drive-gearing including a hollow shaft, a handle-bar carried by said shaft and having limited independent movement thereon, a reversingrod extending through the hollow shaft into operative proximity to the reversing-plate, and a reversing-cam operatively `related to the reversing-rod and handle-bar,

respectively.

1i). In a drilling-machine7 the combination with a spindle, feed mechanism therefor, and reversing mechanism for returning the spindle and including-a reversing-plate, of drivegearing for rotating the spindle, a handlesocket connected lwith the drive-gearing, a handle-bar having limited oscillatory movement upon the socket, a reversing-Camn operative relation to the handle-bar, a springurged latch carried by the reversing-cam and designed to engage the socket when the cam is operated by the handle-bar, means for tripping the latch to permit the release of the cam, and means for operatively connecting the cam with the reversing-plate.

20. In a drilling-machine, the combination with a tool-spindle, a feed-screw therefor, and a feed-nut, of a reversing-plate for arresting or releasing the feed-screw, means for connecting the feed-screw to the spindle when said screw is free to rotate, means for rotating a spindle, and means for retarding the rotation of the feed-nut.

2l. In a drilling-machine, the combination with a tool-spindle, afeed-screw therefor, and a feed-nut engaging the screw, of a reversingplate arranged to arrest or release the feedscrew, said reversingplate being extended into operative relation with the feed-nut to retard the rotary movement of the latter when the feed-screw is released.

22. In a drilling-machine, the combinatie with a frame, a tool-spindle mounted therein, a feed-screw and a feed-nut, of a feed-lever pivoted upon the frame at one side ofthe spindle and having its opposite end located beyond the opposite side of the spindle adjacent to the feed-nut, means for operatively connecting the feed-nut With the upper-end y TOO IIO

with a tool-spindle, a feed-screw and feed-nut,

of the annular rim upon the feed-nut defining a grip-fiange and a brake-Harige, a retarding element in operative relation to the brakeflange, means for throwing said retarding element into or outof contact with the flange, a grip comprising a pair of pivoted jaws engaging the giip-iiange, and means for operating the grip to effect a step-by-step rotation of the feed-nut. i

24. In a drilling-machine, the combination with a tool-spindle, of an operating-handle .my own I have hereto affixed my signature in -the presence of two witnesses.

BENJAMIN F. MOI-IR.

for operating the spindle and having limited movement independent thereof, mechanism foi` moving the spindle toward the Work, and means operated by the handle during its in- I 5 dependent movement for reversing the 1on- Witnesses:

gitudnal movement of the spindle. GEO. A. GUYER,

In testimony that I Claim lthe foregoing as M. M. ROTE.

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