US578484A - Concentric drilling and tapping machinery - Google Patents

Description

(Nn Modei.) 2 Sheetzs--SheetV 1.

BA. ERRINGTON. GONGENTRIG DRILLING AND TAPPING MAGHINERY.

Patented Mar.. 9, 1897-l (No Model.) 2 sheets-sheet 2.

Y A F. A. BRRINGTON.

` GONGENTRIG DRILLING AND TAPPING MACHINERY.

No. 578,484. l Patented Mar. 9, 1897.

TNE MORRIS PETERS C0.. PNDTGLIYHO.. WASHINGTUNJD. C.

UNITED STATES PATENT OFFICE.

FRANKLIN A. ERRINGTON, OF EDGEWATER, NEW YORK.

CONCENTRIC DRILLING AND TAPPING MACHINERY.

SPECIFICATION forming part of Letters Patent No. 578,484, dated March *9, 1 89'7. Application filed October 25, 1895. Serial No. 566,803. (No model.)

To all whom, it may concern.'

Be it known that I, FRANKLIN ALFRED ER- RINGTON, a citizen of the United States, residing in the village of Edgewater, (post-office, Stapleton,) county of Richmond, and State of New York, have invented certain new and useful Improvements in Concentric Drilling and Tapping Machinery, which I desire to secure by Letters Patent of the United States, as described and shown in the following specification and drawings and then pointed out in the claims.

My invention relates, broadly, to means for rotating a spindle in opposite directions or for turning the opposite ends of said spindle alternately in the same direction without reversing the direction of rotation kof the primary driving member of the gear-train, means for bringing the opposite ends of said spindle to bear alternately upon the same point, and means for locking said' spindle in position to preserve its axial alinement with said point, combined with means for readily connecting and disconnecting a cutting-tool with said spindle, means to avoid breakage of the cutting-tool when bottoming or under excessive strain, and gripping and centering means to avoid breakage of said cutting-tool under variation in the alinement of the driving-spindle and the point of operation.

The primary object of my invention is to perform in one handling of the work the two consecutive operations productive of one result at or in the same point, place, or bore, the irst of said operations being a preparation for the second, and the second necessitating the automatic cessation of the rotation of the cutting-tool at the bottom of the hole or under an undue increase o f strain and the reversal Aot' its direction of rotation. However, these means are also usefulas enabling both ends of the same spindle to be used for either one of said operations at the same point by swiveling the head or at two opposite points without swiveling the head, and in `all cases without reversing the direction of rotation of the primary driving member of the gear-train; and to these ends the said invention consists Tiinprthe novel details of improvement and the 5o combination of parts herein shown and described.

la reduced top View of check-until, showing said check-nut with Fig. 3 is a reduced top a method of connecting the driving-disk 5.

view of the driving gear-wheel 3, showing the,

central bore 3a encircling the hub 5 of the driving-disk 5, whereby said wheel is enabled to rotate independently of the parts it drives by frictional contact. Fig. 4 is an external view., of the tap-holder, showing the end of the sliding nut, a set-screw meshing with its concentric screw-threaded bore, and the grooves in the'transverse bore log to receive. the pins 16r of the sliding nut that prevent its rotation and limit its traverse in said transverse bore of the tap-holder. Fig. 5 is a bottom view of the sliding nut, showing the transverse bore 16 for admitting and the set-screw 16il for gripping the head of the tap. Fig. '6 is a sectional view of the tap-holder, showing the slideway for the projecting pins of the sliding nut and for the nut itself, also the selfcentering adjustable collet spring or springs to aline the tap with the spindle and yet allow of a limited deviation in the alinement of the hole with the driver of the tap without breaking the tap, also a variation in the construction of the groove in the socket of the driving-spindle and in the shank of the tool-holder. Fig. 7 is a horizontal section of the tap-holder on the line 16T of Fig.` 4, exposing the collet-spring, which is preferably shown endless in construction by joining the two ends together. Fig. 8 is a vertical cross-section of the parts in position for tapping, exposing the clutch-pins andgeneral mechanism for driving and reversing the spindle Sand adjusting the frictional contact of the disks and gear-wheels. Fig. 9 is an end view of the central portion of the inner face of disk 5, showing the spindle cross-bar in engagement with the clutch-pins, the lines of strain, and the method of supporting the clutch-pins and of limiting the longitudinal movement of the spindle while giving it the longest possible bearing.

For convenience in manufacture the swivelhead 9 is'shown in one casting (see Fig. l)

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having top and bottom arms 9a 9b and a back plate 9C, forming a gear-case to receive the driving mechanism; and for convenience in showing a connection for said heady by a swivel-joint With a supporting part I have shown tapered bore 9e in the extension 9k of the swivel-head castin g to receive the tapered projection 20 of a supporting-frame 20, said projection terminating in a shoulder 20". To hold the swivel-head firmly in alinement with said projection 20a, the screw-threaded taperpin 18 presses a tapered roller 19 against the outer Walls of the groove 19a, and thereby forces the rim 9f toward the shoulder 20h, which arrangement compensates for any Wear in said bearing and preserves the alinement of the head with its supporting-frame. As the groove 19" extends entirely around the projection 20, said swivel-head can rota-te freely thereon.

The outer face of the f riction-disk 5 is shown provided With an externally-screW-threaded hub 5a. An axial bore 5b runs through said disk 5 and its hub 5a to form a bearing for the spindle 8, said spindle S being shown provided With a cross-bar 7, passing through its axis and projecting on both sides beyond its periphery, the length of said cross-bar 7 being greater than the diameter of the bore 5b to prevent said spindle falling through its bearings. On either side of thebore 5b I bore in the inner face of the disk 5 tWo clutchbearings 5d, which I preferably carry entirely through said disk, the centers of said clutchbearings being located on the same diameter of the disk 5 and at an .equal distance from the center thereof, said dist-ance being proportionate to the length of the spindle crossbar 7. I then recess the inner face of the disk 5 by forming acentral bore 5C therein, the diameter of the bore 5c exceeding the length of the spindle cross-bar 7 sufficiently1 to permit the entrance of the latter into the recess thus formed in the inner face of the disk 5.

I preferably make the diameter of the bore ,5e equal to or slightly exceeding the distance between centers of the tWo clutch-bearings 5d, Which cuts away the inner walls of said clutch-bearings 5, leaving the clutch-bearings opening partly upon' the bottom 5f of the recess 5e and partly upon the inner face 5g' of the disk 5. Having preferably shown the shortest distance between the inner Walls of the clutch-bearings coinciding With the diameter of the hub 5, when I noW drive the clutch-pins 5c into the bores 5d until their inner faces are even with the plane of the inner face of the disk 5 their outer extremities Will project from the outer face of the disk 5 and form lugs projecting laterally from the periphery of the hub 5a. As previously stated, the bore 5e having cut away the inner Walls of the clutch-bearings 5d, the inner ends of the clutch-pins 5 project longitudinally into said recess or clutch-chamber 5C from the bottom or face 5f thereof, and laterally from its Walls, forming clutch teeth or faces in the inner face of the disk 5.

I do not restrict my invention to the distancesI have preferably described and shown, as these may vary and still attain the object of this unique construction, which Will be more clearly understood by reference to the parts shown in Fig. 9, Where it is seen that While the clutch-pins are sufficiently exposed to act in their full capacity as clutches in either direction in accordance with the exacting requirements of the conditions, yet in the l construction shown the peripheries of the clutch-pins opposite `their clutch -faces remain embedded vin the Walls of the recess, thereby relieving the clutch-pins of all shearing strains, Which strains they transmit to the supporting walls of the recess to be distributed through the disk itself, leaving the clutch-pins subjected to a compression strain only, said clutch-pins acting as hardened and readily-removable clutch-faces between the spindle-clutch 7 and the disk 5 to relieve said disk from Wear and to enable said disk to drive said spindle With the power of a solid ring or body, thus increasing the driving ability of the clutch-pins many times over that obtained by the use of clutch-pins not so supported, particularly when the strain is entirely exerted at or near their extreme ends, as occurs When the clutches are about to separate.

As indicated in Fig. 9, the lines of strain 7b vary in direction as the clutch-faces or points of contact 7 e between the cross-'bar 7, and the periphery of the clutch-pins 5^c may vary from those I have preferably shown, the aim being to so proportion the bore 5e to the distance between centers of the clutch-bearings 5d as to have the clutch-pins 5c receive the maximum support by their beds 5h and still present an open clutch-face to mesh With the spindle-clutch. The round form of clutchface in combination with the rectangular cross-bar also serves to give the maximum lateral bearing for rotating the spindle With the least frictional surface to resist the longitudinal movement of the cross-bar when the latter is sliding out of rotary engagement, which feature is an important factor in permitting the use of the readily-removable toolholder provided.

The center of the gear-wheel 3 is bored out to afford a central passage-Way to permit said gear-Wheel 3 to be slipped over the hub 5 and its projecting lugs 5C, thereby bringing the inner face of said gear-Wheel in contact With the outer'faee of the disk 5. The check-nut l1 is similarly provided with a central bore llc, but only of sufficient diameter to permit the free passage of the hub 5, the two lugs 5c being received in separate slots 11", provided on either side of said bore for that p'urpose, the depth of said slots 11b being sufficiently greater than the projection of the lugs 5 into them to prevent the lugs 5c from reaching the plane of the outer face of the check- IOO IlO

nut 11, even under the maximum compres- A sion of theiparts, as hereinafter provided for.

The check-nut 11 being now slipped over the hub a and its lugs, the inner face of said check-nut comes in contact with the outer face of the gear-wheel 3, and the lugs 5c being a sliding fit in the slots 11" the check-nut 11 and the diskf-form two friction-disks placed on either side of the gear-wheel 3 and are positively connected to rotate together by a central connection which not only permits of their longitudinal movement independent of each other, but theindependent rotation of the gear-wheel??? should the frictional tension between the parts be-unable to overcome the strain bronght'to bear upon the clutch mechanism connected with disk 5. The construction of such a slip-joint between the two A disks to connect/them to rotate together is it than of the wheel broadly valuable as leaving the intetrmediate wheel 3 free to have gear-teeth 3b wise used without interference. To form a journal for the parts, the check-nut 11 is pro- `vided with a hub 11a, extending from the surface 11d of said check-nut. The hub 11a is now inserted in the bore. 9g of the arm 9b of the swivel-head 9 and the screw-threaded adjusting-ring 13 screwedupon the hub 5a, and said adj Listing-rin g being of greater diameter than the diameter ofthe bore 9g the parts are held in position by: the surface 11d of the check-nut 11 on one side of the arm 9b and the inner face of the adj listing-ring 13 on the other. The bevel-gear driving-pinion 2 is next placed in position by its hub engaging with the bore 9d in the back plate 9c of the swivel-head 9, its gear-teeth 2b meshing with thegear-teeth 3b of wheel 3, and the connecting driving-shaft 1 is run through the bearing 1a in the supporting-frame 20, keyed to said driving pinion by the usual feather and groove, and prevented from longitudinal movement by its screw-threaded ends meshing" with the usual jam-nuts, which details maybe of usual or approved construction for formingsaid connection.

The reversing-wheel 4 is to be turned at a higher velocity and less power is required of 3. The driving bevelpinion 2 is therefore preferably shown provided with an additional set of bevelgear teeth 2a, the two sets of teeth 22L 2b lying in parallel planes at the same angle to the axis of said pinion 2, the plane of the gear-teeth 2b being within that of the gear-teeth 2a. By this arrangement the gear-wheels tated in opposite directions at the same time and at different velocities by pinion 2, the pinion 2 running at all times in the same direction, and each of the gear-wheels 3 4 having its direction of rotation reversed as its position is changed from above to belowthe pinion 2, or vice versa, which fact brings clearly to View that the clutch mechanism must be adapted to exert lateral pressure in either direction, as its driving-wheel happens to be on one side or the other of the driving-pinion or be other- 3 4 are ro-` direction, and that the opposite endsof the spindle can be used in the same or opposite directions of rotation at the same point by swiveling or at opposite points without swiveling without in either .I

case reversing the direction of rotation of the A driving-pinion 2, andvthat the opposite ends of the same spindlecannot be used even in the same direction at the same or opposite points Without reversing the driving member, except in the construction I have shown, which distinguishes my invention broadly from the previous'state of the art as applied to using both ends of the same spindle, and also as applied to using one end of the spindlein opposite directions.

The duplication ofthe simple hub 112L and the general construction of the check-nut 11 of Wheel 3 being impracticable for the wheel 4 in the device shown, I have supplied the internally-threaded bearing-ring 10, having a smooth periphery 10L and a flange or shoulder 10b projecting therefrom and corresponding to the flange or shoulder 11d and hub l1a of the check-nut 11, andan externally-threaded check-nut 12, meshing with said internallythreaded bearing-ring 10 and terminating in a ange or shoulder 12a. I first place the bearing-ring 10 in the bearing 9h-of the arm 9 of the swivel-head 9. Then the reversing-disk 6 and the gear-wheel 4 are inserted therein by the hub 61 passing loosely through the screwthreaded bore 10c of the bearin g-rin g 10. The bearings 5b 6b are then brought in line, the

'spindle E is passed through them, and the cross-bar 7 inserted in the transverse bore 7 a. The screwthreaded check-'nut 12 is now screwed through the bearing-ring 10 until its shoulder 12aja1ns with the outer face 1()d ofthe bearing-ring 10, which arrangement raises the inner face of the disk 6 close to the corresponding face of the disk 5 and brings the gear-teeth 4L of the wheel 4 into mesh with the gear-teeth 2a of the pinion 2 and prevents any longitudinal variation 'of the gear-wheels with relation to their respective bearings. The screwthreaded adj usting-ring 14 is then screwed on the externally-threaded hub 6a and adj qsts the frictional tension between the parts, as

heretofore explained with reference to adjusting-ring 13. The opposing surfaces ofthe disks 5 6 are shown relieved, thereby reducing the diameter of their inner faces, which preferably bear upon each tension of the contact of the frictional surfaces is relaxed.

Insteadof boring the clutch-bearings 6d from theinner face of the reversing-disk 6 I bore them from its outer face in a-similar manner and at Vthe same distance between the centers as in the case of the clutch-bearings 5, but as the bores 5d were carried through to the inner face of disk 5 the bores 6(I are not carried through to the inner face of 'disk 6, being terminated at a shoulder 6h, which gages the distance between the IIO other when the endsof the clutch-pins 5c 6c to bring the vinner ends or opposing surfaces of one ofsaid sets of clutch-pins within the plan'e ofthe inner' face of its respective disk. The inner' face 'of the disk 6 is now recessed by a bore 6e ofthe same diameter but of greater depth 'thanthe `bore 5e in :disk 5, said b`ore'l6e openbearings 6d until theirinner ends abutagainst the shoulders f6, when the 'dista-nce between the `inner lends of the clutch-pins'6c `b should be greater than the height of the clutch 7 lof the spindleB to permit saidclutch to clear one set of clutch-pins before engagingrthe other; and the vinner 'ends of Vth'ejclutch-pins bc project longitudinally beyond the bottom or face'fGf of the recess or clutch-chamber 6'e and laterally-from itswalls in thesarne man-y neras previouslyexplainedwith reference to the clutch-pins 5, the clutch-pins 6 beingsimilarly relieved from` shearing strain by being similarly embedded in the 'outerwalls of their 'bearings lGlthrough the whole extent oftheir projection beyond the ybottom 6f ofi the recess 6e. The'out'er extremities of the clutch-pins 6 'form lugs upon'the periphery of the hub 6, pass Lthrough"acentralbore 'in the Wheel-i, and mesh with'slots 12", all-as* previously explained for'clutch-pins'c; The

faces-orfbottoms` 5f`6 f ofthe recesses' e'and 6 limit the longitudinal movement of the spindle-clutch 7, the bores 5e '6e beingof sufcient'diamet'er to permitof itslfree'rotation,-

and the wallsof' saidbores holdsaid spindleclutch 7 from lon gitudinal movement'through its transverse bore 7, permitting said crossbar 7 to be a'loose lit` therein, if desired.

T-o bringeachfend ofthe spindle Sto` reg-H ister with the same point, I have shown a tapered locking-pin 27 carried in a screwthreaded bore 27 in theextension Qlof theswivel-hea'd 9, said locking-pin 27 being adapted to mesh with a taperedbore or bores 27d 27f, shown in the projection 20 of the supporting-'frame 20; and'to'y press said pin intosaid bore a screw-'threaded'cover 27b'is lscrewed-into said bore 27 and a spring 27e inserted between said cover and the outer face of the locking-pin 27. To withdraw said locking-pin from the bore 27d, the rod and buttony 27C are'connected with said locking- Pm, the locking-pin 27/is withd rawnfromthe'bore 27, and as the swivel-head is swung around it will press against the periphery of theprojection 20 until the tapered. bore 27 f is reached, whenit will slide intosaidbore, its

taper litting'firmlyagainst the taperingsidesof said-bore, bringing the other end of the spindle 8 to register with the same point that the opposite end was formerly working upon.

lt being desirable in a tool or machine of thiskind to connect and disconnect the cutand by pulling the button andV rod 27 lthe spiralspring has a ting-tool with the spindle-'8 while fsaid spind dle is rotating, l provideaxial bores-o-r-'socke'tsl 8 v8b inthe respective ends of said spindle,

.running well up toward-the centercross-"bar 7, but terminating at a suiticient` dis-tance therefrom -to avoid weakening 4the spindle-unv A" short distance beyond the" end of the said 'socket'8 necessarily.

8 lbore ktransverse holes 8 48i1 of smaller diameter than thatv of the sockets@ 8b, and connect'saidtransverse holes 8c 8d with the sockets 8 8b 'by punching through the intervening metal 'preferably with a rectangular punch of about the length of the `diameter of the sockets8"8fand the thickness ofthe diameter yof the transverse bores SCS, whereby the bores 8 8d are tconnected with the Vsockets 8 l'8b lby,a'transverse -slot affording a'planebearing-surface; Inow lhollow outltheinner walls ofl the sockets 8` 8b by yconcentric grooves 8, running. enti rely around said sockets, and in .tlyrisl groeve yl". place an *elasticv member which gives the greatest possiblel concentric/'beanng-surface,

expands readily longitudinally, but-resists lateral "press-ure, and which -in `expanding -longitudinally 'reduces its diameter laterally.v rPhese `conditions I: mzeetby u sin gfa vspiral ire,- taining-spring. 8f, which l preferably-'join at its ends; The upper andlower walls `of said concentric Agroove vhold said retaining spiral `spring in position longitudinally. `holders 15'A 16"(see'li`ig. Ll) areprovidedL at their uppery 'extremities with 'a `'feat .16, the

The tool* diameter'of the shank'lb'ofeach being varied `atl 16C 16 to 'coact' with: the retaining-spring Sfinfthesookets ASWS of the spindle 8.

Amongfthe :many advantages of the use rotv a concentricretaining-spring is that Ait `will permit of a projection'onthe shank'of atoolholderandl not weaken itbygrooving. The Shanks of the tool4holders are thrust up Vinto the-sockets ot` the spindle, their-'teats 16 slip into` the slotsSc 8 to drive them, and the springsf sink into theirgrooves 16, or-underv theirv projections 16C, to retain the teatsof said shanks in rotary engagement with the transverse bores 8 8, which arrangement permits the shanks also to be readily removed bysimpl f pulling them out ofy thespindlesocket. rIhis method is Vsuperior to thelocking-pin system in general use, particularly when used in a device of this kind, as the spring can beput up into -the spindle-socket without enlarging the diameter ofV the-spindle or decreasing its strength at'a vital point, whereas the looking-pin would be too bulky for a reversing mechanism and less positive and above all less sensitive in its action, as bearing all around the shank.

The tool-holder 15 I'have shown arranged with a tapered socket to receive a taperedshank drill, but the tap-holderrl is of unique construction. lt being undesirable inpractice to hold the tap in rigid alinement with its holder and yet necessary to have it run IOO' the clutches past each other, and thereby coactin reducing the grip required of the retaining-spring 8f.

As the use of both ends of a longitudinallymovablev spindle in combination with a reversing clutch mechanism is not adaptable to a turret-head containing several spindles, and there maybe several different-sized holes to drill and tap in the same place (as illusshould the work not be such as would stand iirmly on its own base (as in the case of a cylinder tapped through its side) any slight deviation in the alinement would be compensated for by the self-centering adjustable collet spring or springs shown.

Having now described my invention, what il I claim isdle carried thereby and having each of its a tool or tool-holder, and a reversing mechanism also carried by said swivel-head to rot-ate said spindle in opposite directions, sub- Vvstantially as described.

2. The combination of a spindle having each of its ends provided with means for connection with a tool or tool-holder, means to turn said spindle in opposite directions, means to swivel said spindle to bring its ends to register alternately with the same point, and an automatic locking mechanism to lock said spindle automatically in axial alinement with said point, substantially as described.

Y 3. The combination with a supportingframe of a swivel-head connected therewith by a swivel-joint, a pinion projecting` into said swivel-head, two concentric wheels journaled in said swivel-head and meshing with said pinion, two clutch formations one of said clutch formations being connected with one of said wheels and the other of said clutch formations with the other of said wheels, a spindle, the axis of said spindle being concentric with the axes of said wheels, and a third clutch formation located between said wheel clutch formations and connected with said spindle, substantially as described.

- 4. The combination with a supportingframe, of a swivel-head connected therewith bya swivel-joint, one of said parts having an index bore or bores and the other of said parts having a locking pin or pins to mesh with said index bore or bores, to lock said swivel-head at certain intervals to said supporting-frame, a pinion projecting into said swivel-head, two wheels journaled in said swivel-head and meshing with said pinion,

two clutches, one of said clutches being connected with one of said wheels, and the other of said clutches with the other of said wheels, and a spindle provided with a clutch or clutches for engagement with said wheelclutches, substantially as described.

5. The combination of a swivel-head adapted for connection by a swivel-joint with a supporting part, a pinion projecting therein, two concentric wheels journaled in said swivelhead and meshing with said pinion, one of said wheels being of greater diameter than the other, two clutch formations one of said clutch formations being connected with one of said Wheels and the other of said clutch formations with the other of said wheels, and a spindle provided with a vclutch or clutches for engagement with said wheel-clutches, substantially as described.

6. The combination oi a bevel-pinion carryin g two sets of driving-faces, the pitch-cone of one of said sets of driving-faces lying within that of the other, two concentric bevelwheels meshing respectively with said sets of driving-faces of said pinion, a spindle, means for connecting said spindle alternately with 1. VThe combination of a swivel-head,a spinl either of said wheels, and means for swivell ing said spindle, substantially. as described. ends provided with means for connection with 7. The combination of a friction-disk, a

. screw-threaded hub projecting therefrom, a 4 Wheel surrounding said hub, a screw-threaded l adjusting -ring to mesh with said screwthreaded hub to move one of said parts longitudinally, a check-nut to hold said adjusting-ring in posi tion when adj usted and a pinion meshing with said wheel, substantially as described.y

8. The combination of a friction-disk having a screw-threaded hub, another disk surrounding said hub, one of said disks being provided with a positive clutch, a screwthreaded adjusting-ring meshing with said screw-threaded hub to move one of said disks longitudinally, a check-nut to hold said adj usting-ring in position when adjusted, and a spindle having a clutch adapted to engage said disk-clutch, substantially as described.

9. The combination of a friction-disk having a screw-threaded hub, a check-nut surrounding said hub, one of -said parts having an indenture and the other a projection meshing therewith to connect said disk and said check-nut to rotate together by a slip-joint permitting of theirindependent longitudinal movement, another disk also surrounding said hub and located between saidiirst-mentioned disk and said check-nut and capable of rotation independent thereof, a screwthreaded adjusting-ring meshing with said hub to adjust the tension of the frictional contact of said parts, one of said disks being IOO IIO

provided with a positive clutch, and a spindle centrically-located longitudinal bore opening other of said partly on the face of said recess or clutchchamber andindenting the side wall thereof, a clutch-pin located in said bore and-projecting longitudinally from the face of said recess or clutch-chamber, part of the periphery of said clutch-pin being embedded in the su pporting-indenture thus provided in the side Wall of said recess or clutch-chamber and part thereof extending laterally into said recess or clutch-chamber, whereby said clutchpin is relieved from shearing strain, and a spindle provided with a clutch for engagement with said clutch-pin, substantially as described.

11. 4The combination of two disks and means for rotating said disks in opposite directions, one of said disks having a recess or clutchchamber in its face and an eccentrically-located longitudinal bore opening partly on the face of said recess or clutch-chamber and indenting the side wall thereof, a clutch-pin located in said eccentrically-located bore and projecting longitudinally from the face of said recess or clutch-chamber, part of the periphery of said clutchpin being embedded in the supporting-indenture thus provided in the side wall of said recess or clutch-chamber and part thereof extending laterally into said recess or clutch-chamber, a clutch connected with the other of said disks, and a spindle having a clutch located between said diskclutches and adapted to engage with either thereof to turn said spindle, substantially as described.

l2. The combination of two disks and means for rotating said disks in opposite directions, each of said disks having a central bore or bearing, one of said disks having a recess or clutch-chamber within the plane of its inner face, a clutch-pin connected with said disk and projecting from the face of said recess or clutch-chamber, the inner end of said clutchpin also lying within the plane of the inner face of said disk, another clutch connected with the disks, a spindle journaled in said bores or bearings of said disks, and a clutch connected with said spindle for engagement with either of said disk-clutches, substantially as described.

13. Thecombinationofabearing-piecehaving two bores, one of said bores extending through an arm of saidbearing-piece, a pinion journaled in the other of said bores, said bores being bored at an angle to each other, a bearing-ring having a smooth periphery fitting into said bore in said arm and terminating in a shoulder or flange, said bearing-ring also having a screw-threaded bore, a Wheel journaled concentrically with said bore in said arm, an elevating-screw meshing with said screw-threaded bore of said bearing-ring to raise said wheel into mesh with said pinion, and having a shoulder or flange to jam against the abutting surface of said bearing-ring, said flanges of said bearing-ring and of said elevating-screw being of tary motion, the Walls axial bore or socket,

greater diameter than said bore in said arm, whereby said flanges form a bearing on both sides of said arm to prevent longitudinal movement of said parts in said bore in said arm, substantially as described.

14. The combination of a spindle having an axial socket, said spindle being provided with a clutch formation to enable it to impart roof said axial socket being indented by a concentric groove, and a spring extending along said groove, and eX- tensible into said socket, s ubstantially as described.

15. The combination of a spindle having an a smaller transverse bore passing through the axis of said spindle, the center of said transverse bore being located farther along said spindle than said axial bore or socket extends into said spindle, said axial bore or socket and said transverse bore being connected together, a concentric groove cut in the walls of said bore or socket, and a spiral spring inserted in said groove, substantially as described.

16. The combination of a spindle provided with a clutch formation and having an axial socket, the walls of said socket being indented by a concentric groove, a spiral spring placed along said concentric groove, and a shank adapted to enter said socket and provided with a clutch to engage said spindle clutch formation, said shank having a shoulder to coact with said spring to connect said shank longitudinally with said spindle, substantially as described.

17. The combination of a tool-holder provided with transversely-movable gripping means and having an axial socket whose side walls are indented by a concentric groove, and a spiral spring placed along said groove, substantially as described.

18. The combination of a tool-holder having an axial bore meeting a transverse bore, a sliding nut adapted toenter said transverse bore, one of said parts having an indenture extending through part of its length and the other a projection meshing therewith to limit the traverse and prevent the rotation of said sliding nut in said transverse bore, said sliding nut having a transverse bore meeting a screw-threaded bore, and a set-screw meshing with said screw-threaded bore in said sliding nut, substantially as described.

19. The combination of a tool-holder having an axial bore meeting a transverse bore, a sliding nut meshing with said transverse bore and having a transverse bore meeting a screwthreaded bore, and a set-screw meshing with said screw-threaded bore in said sliding nut, substantially as described.

20. The combination of a tool-holder having an axial socket meeting a transverse bore, said axial socket being provided with a plurality of elastic centering-pieces, a sliding nut adapted to enter said transverse bore in IOO IIO

said tool-holder, said sliding nut having a transverse bore meeting a screw-threaded bore, and a set-screw meshing with said screwthreaded bore in said sliding nut, substantially as described.

2l. The combination of two disks, a casing carrying gearing to rotate said disks in opposite directions, a spindle, a clutch connected therewith, one of said disks having an eccentrically-loeated clutch-pin bearin g extending longitudinally through from the inner to the outer surface of said disk, a clutch-pin located in said clutch-pin bearin g andadapted to engage said spindle-clutch, and another clutch connected with the other of said disks, whereby said clutch-pin can be readily adjusted longitudinally in its bearing, substantially as described.

Stapleton, Staten Island, New York, Octoloer 21, 1895.

F. A. ERRINGTON. Witnesses:

BERNARD O. BOGERT, DIMoN E. ROBERTS.

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