US476205A - Turret lathe - Google Patents

Description

(No Model.) '4 Sheets-Sheet 2. P. A. LANE.

. TURRET LATHE. No. 476,205. Patented May 31, 189-2.

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TURRET LATHE. No. 476,205. Patented May 31, 1892.

4 Sheets-Sheet 4- F. A. LANE. TURRET LATHE.

(No Model.)

Patented May31, 1892.

, UNITED STATES I PATENT OFFIC FREDERIC A. LANE, OF NEW HAVEN, CONNECTICUT.

TURRET-LATHE.

SPECIFICATION forming part of Letters Patent No. 476,205, dated May 31, 1892.

Application filed August 13, 1891- Serial No- 0Z,5 7- (N modeL T0 at whom it may concern.-

Be it known that LFREDEEIC A. LANE, of New Haven, in the county of New Haven and State of Connecticut, haveinvented anew Improvement in Turret-Lathes; and 1 do hereby declare the following, when taken in connection with accompanying drawings and the letters and figures of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitutepart of this specification, and represent,

Fig. 1, a plan view of the front portion of the slide, showing the mechanism and operation for arresting the retreating movement of the carriage before it reaches its extreme point of retreat; Fig. 2, afront view of the attachment and lathe complete; Fig. 3, atransverse section cutting on lineocx of Fig. 2, but showing the turret attachment in side view and representing the turret and carriage at the extreme point of retreat; Fig. 3, a similar View of the carriage, turret, and ratchet as that of Fig. 3, except the position of the turret and carriage is at that point where the pawl is just engaging a tooth of the ratchet; Fig. 4, a partial longitudinalsection of the front end of the slide, showing the arrangement of the stop 53, adapted to arrest the retreating movement of the carriage before it shall have reached its extreme retreating position; Fig. 5, a side View of a blank of' an arbor for clock-pinions as adapted for introduction to the machine for operation thereon; Fig. 6, the same after the operation of the machine is completed; Fig. 7, a top or plan View of the slide with the carriage and turret removed; Fig.8, an under side view of the carriage, showing the toothed surface of the turret-plate r; Fig. 9, a transverse section through the turret, cutting on line 'y y of Fig. 3 near the carriage; Fig. 10, a longitudinal section through the forward portion of the slide, representing the plate 25 of the turret as engaging with the dog 16 in the slide for the purpose of rotation; Fig. 11, atransverse section through the slide, carriage, and turret, illustrating the interlocking mechanism between the turret and carriage; Fig 12, a longitudinal section through the front portion of the carriage, cutting on line so as of Fig. 7.

Figure 1, a top or plan view of a lathe having the turret attachment applied thereto;

This invention relates to an improvement in a turret attachment for lathes for turning articles of various diameters and shapes, the

object being to provide an attachment for an ordinary lathe which may be readily applied thereto and by which shaping or reducing articles of circular shape in transverse section may be readily produced; and it consists in the construction and combination of mechanism as hereinafter described, and particularly recited in the claims.

7 In illustrating the invention it is shown as adapted for turning the arbor and collets for lantern-pinions for clock-work.

In Fig. 5 a blank for such an arbor and pinion is represented and the finished article in Fig. 6. The arbor a is usually made from wire of the required diameter and in length slightly greater than that of the finished article. Upon this arbor two collets b c areapplied, usually by casting, these collets being somewhat larger than required for the finished article. In turningthe blank to the finished shape gudgeons d are formed on each end of the arbor and the two collets. are reduced to the required diameterandthickness, the collet I) being somewhat larger than the collet 0, so as to form the hub for the gearwheel to be attached thereto, and this collet b is reduced to form a shouldere upon which the gear-wheel is set, the two collets being distant from each other as required for the formation of the pinion, the pinion being completed by drilling through the collet 0 into the collet b and introducing wires to form the leaves of the pinion, this latter operation being performed in the usual manner.

The machine of this invention is adapted to convert the blank, Fig. 5, to the shape of the finished article, as seen in Fig. 6.

A represents the bed of the lathe, B the head-stock, in which the mandrel C is arranged and carrying the pulleys D and Ein the usual manner.

F represents the tail-stock, which is arranged upon the bed in the usual manner, and, as usual, is provided with a spindle G, which is adapted for adjustment longitudinally, so 'as to centrally hold the work between its inner end and the mandrel, as usual in this class of lathes.

The attachment to be applied to the lathe consists of a slide H, arranged transversely across the bed of the lathe and so as to slide longitudinally thereon in the usual manner of the slide-rest of a lathe and it is connected to the bed, so as to be held firmly thereon yet permitted longitudinal sliding movement. As here represented, the slide 11 is secured upon the bed A of the lathe by means of a binding-plate I upon the under side of the-bed of the lathe, connected to the slide through the bed by a stud J or otherwise, so that the slide may be held firmly in its place upon the top of the bed, yet permitted to move freely toward and from the head-stock. As here represented, the longitudinal movement is imparted to the slide H by means of a handleverK, hung upon a fulcrum L at the lefthand end of the lathe and connected by a rod Mto the binding-plate l, the lever being ar-' rangedto swing in ahorizontal plane and so th'at the operator, applying his hand to thelever Kand moving that lever in such horizontal plane, will impart a corresponding lon-' gitudinal movement to the slide II. This movement of the slide is adapted for quick adjustment or movement of the lathe. In some ,cases, however, a regular feed is desirable, as in engine-lathes. To accomplish such regular movement of the slide H, a leadings'crew N is supported in bearings O below-the lathe-bed and which receives a continuous rotation through apulley P, arranged on the leading-screw or otherwise, it being understood that the screw is arranged for free rotation, but without longitudinal movement, and, as usual in lathes provided with a leading-screw, but that the slide may be moved in either d'irection that is, toward or from the head-stocka portion Q of the screw toward one end is cut with a right-hand thread and at the other end B the screw is cut with a left-hand thread. From the slide two stirrups S and T project downward, through which the leading-screw extends, they being connected to the slide by a spindle U,,(see

threaded corresponding to the right-hand screw-threaded portion Q of the leadingscrew N. Normally this half-nut stands above and out of engagement with the screw, as represen-ted in Fig. 3, so held by the spring V, but yet so that by drawing the stirrup downward the nut V may be brought into engagement with its screw-threaded portion of the leading screw N, and so that when so engaged the leading-screw will impart to the nut a travel in the direction of the screw, which travel will be communicated to the slide H. The other stirrup T is provided with a like halfnut X, which may be drawn into engagement with the other threaded portion of the screw, so as to impart to the slide a movement in the direction opposite to that which would be imparted to it by the operationof the screw upon the other nut W, this nut X beingheld up out of engagement with its portion of the screw in like manner as described for the nut W. To draw these nuts into engagement with their own portion of the leading-screw N, as may be required, a lever Y is hung upon a fulcrum Z at one side of the stirrup S, the lever extending through the stirrup and over a bearing or anti-friction roll f in the stirrup,

and to the free end of the lever a foot-pedal is connected, as by a chain g, so that the operator by his foot may depress the stirrup S and draw the nut WV iutoengagement with its portion of the leading -screw whenever required. A similar lever h is hung upon a f-ulcrum 1'- at one'side of the stirrup T and extends through the-stirrup and so as to bear upon an anti-friction roller 7c, in like manner as described for the lever Y in the stirrup S,

and it is also in like manner provided by a connection Zwith a foot-pedal, so that the stirrup T may be drawndownward to bring its nut X into engagement with its portion ofthe screw, as required, thus by his foot the operator may bring either nut into engagement with the leading-screw, so as to impart to the slide a corresponding movement toward or from the head-stock, as occasion may require.

Upon the slide H a carriage mis arranged and suitably guided, so as to receive a reciprocating movement in a line transversely across the bed of the lathe, or at substantially right angles to the axis of the mandrel and spindle and as usual in the-slide-rest of lathes. The reciprocating movement is imparted to the carriage m by means of ahandlever a, hung upon a fulcrum 0 and so as to swing in substantially avertical plane. From the hub of the lever an arm p extends upward, to which a link q is attached and connects the said lever with the slide m, and so that as the lever is moved up and down it will impart a corresponding forward and backward movement to the carriage m. Upon this carriage the turret r is arranged and so as to rotate in a horizontal plane-that is, the axis of rotation of the turret is vertical. The'turret is connected to the carriage as represented in Fig. 11. The turret is constructed with a trunnion 8 upon its lower end, which passes through a corresponding seat in the top of the carriage, and upon the under side of the trunnion a collar t is secured, the collar taking a bearing upon the inside of the carriage around the trunnion, and so as to hold the trunnion firmly upon the carriage, yet permit rotation of the turret, the collar t rotating with it. The turret is provided with a series of tools, as 2, S, 4:, 5, 6, 7, and 8, (maybe more or less in number, according to the work required,) the tools being of the shape to produce the proper out upon the article to be operated upon and are arranged radially in the turret and adj usted according to the work to be accomplished. The rotation of the turret is such as to present either tool as it may be required. The rotation of the turret is made automatic and is produced in the reciprocating movement of the carriage. To produce such rotation of the turret, the collar t upon the lower end of the turret is constructed with ratchet- teeth 9, 10, 11, 12, 13, 14, and 15 upon its under surface, corresponding in number to the number of tools in the turret.

In the slide I-I below the collar 15 a vertically-movable dog 16 is arranged. (See Fig. 10.) This dog is a pin setin a corresponding cavity in the slide H and rests upon a spring 17, the tendency of which is to force the dog upward. The nose of the dog is beveled backward and so thatits forward surface may engage the teeth of the collar 25. (Represented in Fig. 10 as engaged with the tooth 9.) This dog stands nearthe forward end of the slide H, but so that as the carriage m retreats the dog stands in the path of a tooth of the collar t, and when that tooth is so engaged with the dog 16, as seen in Fig. 10, the completion of the retreating movement of the carriage will cause the collar 15 and the turret to rotate accordingly-that is, to the extent of one tooth on the collar 25. Then on the next advance of the carriage the next tooth, operating upon the bevel nose of the dog, will cause the dog to descend, so that the turret may escape therefrom, and then on the next retreat the tooth which so passedover the dog will be engaged and the next step in rotation imparted to the turret. A stop 18 is provided between the slide H and the carriage, (see Figs. 1 and 2,) which limits the retreating movement of the carriage'and so as to stop it at the point when the required tool is presented for work. WVhen the turret, has been thus properly adjusted, it is neces-'. sary to lock it to the carriage, so as to prevent any accidental rotative movement of the turret in its next advance. To accomplish this object, the collar t is provided with a series of pins 19, 20, 21, 22, 23, 24, and 25, corresponding to the numberof teeth on the collarthat is, with the number of tools or steps of rotation required for the turret. These pins work freely through corresponding holes in the collar and in length correspond to the thickness of the collar, as seen in Fig. 11, and so that normally they work between the under surface of the carriage and the upper surface of the slide, as shown, for the pin 23 in Fig. 11. In the carriage above the collartand at a point corresponding to one of the pins-say 19-when the turret is at rest a follower 26 is arranged, (see Fig. 11,) which is of a size and shape corresponding to the said pins and is provided with a spring 27, the tendency of which is to force the said follower 26 downward and so that when one of the pins, as 19, is presented below this follower, as seen in Fig. 11, the said follower under the force of its spring will have a tendency to force that pin 19 downward. In line with the point where such pin, as 19, stands when the turret is at rest the slide is constructed with a longitudinal groove 28, (see Figs. 7 and 11,)

which in width corresponds to-the width of the pins in the collar t, and so that when a pin stands over that groove, asseen in Fig.

11, the follower will force that pin downward into the groove 28 of the slide H, the follower itself entering the upper end of the hole of the pin which it has thus depressed, and, as seen in Fig. 11, the follower thus engaged with both the collar and the carriage firmly interlocksthe two, so as to prevent the possible rotation of the turret while thus interlocked. The pin thus depressed by the follower works through the groove 28in the carriage, so as to permit the interlocking to continue during the advance and retreating movement of the carriage.

In the groove 28 and near the forward end a stationary rise or cam 29 is formed, preas 19, then standing in the groove 28 will ride onto the stationary cam 29 in the groove and thus be forced upward and so as to press the follower into its recess in the carriage and out of engagement with the turret and so that in the completion of the retreating movement of the carriage from this disengaged position the dog 16 will operate, as before described, to impart one step of rotation to the turret when the nextpin will be brought into line with the follower 26 and so that on the next advance of the carriage that second pin will ride off from the cam 29 into the groove and permit the interlocking, as before. The cam 29 is made of a length only sufficient to hold the follower out of engagement with the turret while the rotation is being produced and so that the pin may pass off from the other side of the cam again into the groove, and so as to make the engagement with the turret sosoon as the rotation has been completed, and so as to insure the rotation of the turret stopping at the proper point, for so soon as the next pin of the collar comes below the follower it will be forced into the groove and thus arrest the rotation of the turret. Hence on the next advance the pin will ride over the cam, but again return into the groove before the turret shall have been advanced to bring the tool into operation. The extensioun of the groove beyond the cam 29 at the outer end may be omitted, but is desirable as being a certain means of arresting the rotation of the turret at the proper point.

To insure the registering position between the pins on the plate tand the follower 26, the turret is constructed with a series of notches 30, corresponding to the number of tools, as seen in Fig. 9, and combined with these notches is a spring-dog 31, made fast to the carriage, the nose of which is adapted to engage one of the said notches when presented thereto, and as seen in Fig. 9, but yet IIO so as to yield when the forced rotation of the; turret commences. The position of these; notches with relation to the nose of the dOgg corresponds to the point where the pins of,

the plate will register with the follower 26 of the carriage,zand so that saiddog will tem-e porar'ily 'arresttthe rotation of the turret when; this registering position is attained and so as to force the follower into engagement with theturret, as before described.

.As a rmeans for stopping theadvance movementeofthe turret whenever the tool shall have reached its required advanced position,i the turret is provided with aseries of stops-321 below thecuttersand projecting radiallyfrom the turretand made adjustable as to length, of projection. In the plane of these stops32 and at the rear a stationarystop 33 is-ar ran ge d,-w-hich consists of a longitudinaliflange secured-to a bracket '34, which projects up from the :rear of the lathe, (see Fig. 3,) and so thatas the turret advances the stop beneath th'e'advancing cutter willstrike thesaid flan ge when the full advance of the cutter is com-- pleted, the stops 32 being adjustable .to vary the advance of the cutterasoccasionmay .require. These -stops,:combined with the flange 33, provide for depth of cut.

Insome cases diffieren-t'depthsof out are required to be made by the same cutter-as, Y for illustration, the :collets Z) andc are of differentdiameters, but theirsurface or periph ery maybe produced by the same cutter. To permit such action of the same cutter, an independent stop, as 35, is provided for that particular cutter in a plane out of the plane of thestop-fiange 33, and in the plane of this stop 35 an independent stop-flange 36 is provided, (see Figs. 1 and 3,) this flange 36 presenting-a longitudinal surface, but with an offset, as at 37, Fig. 1, thus presenting two stop-surfaces, according to the variation required for the depth'of cut. Thissame stopflange 36 may present any irregularity in its edge and so as to serve as .a guide for the varying longitudinal movement of the turret. The stop working against the edge of that flange-will vary this backward and forward movement, according to the irregularities of such edge and consequently produce a cut of corresponding shape.

To stop the longitudinal movement of the slide II at the proper positions for the opera- 1 tion of the tools on the turret, a rotating shaft 3 38 is arranged in suitable bearings 39 beneath the slide II, the shaft being parallel with the path of movement of the slide. This shaft carries at its end a ratchet-wheel 40, and on a the carriage a pawl 41 is hung,which is adapt- 9 ed to engage the teeth of this ratchet as the carriage retreats and as seen in Fig. 3, and i so that as the carriage completes its retreat a 1 partial rotation will be imparted to the ratchj et-wheel 40. The ratchet-wheel 40 carries several longitudinally-projecting pins, as 42,

43, 44, 45, 46, and 47, more or less in number,

according to the longitudinal stops required.

:(Here represented as six.) These stops roitate with theratchet-wheel 40, and so-thatunider each rotation the position of the projectjingpins will be changed. I

Stationaryon thelathe-bed -is a stop 48, :and this stop stands in the position correspondingto the path of movementof one of the pins on the wheel.40-that is, so that these pins may be successively brought into line with the stop 48. Consequently one of those pins beingin line with-the stop 48 that pin will come against the stop 48 when the slide has been moved so far longitudinallyas to bring thepi-n into contact with the stop. EThese pins correspond in position to the re-' spective toolsand so thatouetool brought into aposition to operate its pin will be at.

the=same time brought into line withthe stop .48, and .so that with that tool workingand the carriage movedlongitudinally the further operation of that tool will bearrested when the pin reaches the stop; or the pins may serve to locate'the tools --wi-th relation to the work to be -donethat is to say, if simply a radial cut is to be made. ticular tool which has todo that work will reach thestop when the position for that-:tool to'opcrate is reached, and so that, the slide being held thus arrested by the stop 48, the tool may then be advanced to make its out. For illustration, the pins for the respective tools will come against-the stop 48 when the tool which is to cut the sides of the respective collets is reached. In such case there is no longitudinal movement'during the operation of the tool. It is simplya depth of cut. Again, in cutting thegudgeon 61 there will be a depth of out which will be governed bythe stop-flange 33. A corresponding pin'will locate the cutter at the point where the shoulder is to be formed. Then a longitudinal movement therefrom will out that gudgeon. For the other gudgeon an adjustable stop 49 is arranged over the flange 33, projecting toward the turret, and against which the stop on the turret will strike when the slide is moved to bring the tool for cutting that other gndgeon into'the right position for the shoulder. Then that tool is advanced and moved longitudinally to cut that other gudgeon.

In some cases more than a single operation is required to be produced by a single toolas, for illustration, the cutting down of the face 50 of the collet c, the cutting of the surface 51 of the collet b down to the shoulder e, and then the cutting of the surface 52 from the shoulder to the arbor may be produced by the same tool and Without rotation of the turret, the change of position of the tool longitudinally being all that is required. To accomplish this object, the rotation of the turret is prevented by providing a stop which will arrest its retreating movement before the dog 16 is brought into operation upon the turret. This stop consists of a verticallymovable dog 53, arranged in the slide H, as seen in Fig. 4, the dog being provided witha Then the pin of the parspring the tendency of which is to hold the through the upper surface of the slide and so as to stand in the path of the retreating carriage, as represented in broken lines, Fig. 4, and which will serve to arrest the retreat of the carriage before it reaches the stop 18. This point of arrest of the dog 53 occurs before the dog 16 can come into operation.

To bring the dog 53 into operation at the required time, a cam 54. is arranged on the wheel 40, so as to revolve with it, and upon the under side of the slide H is alever55, arranged to swing in a horizontal plane. One arm of this lever is adapted to pass below the lower beveled end of the dog 53 and so as to force the dog upward, as indicated in broken lines, Fig. 4. Normally,however,this end of the lever stands so far away from the dog 53 as to permit that dog to stand in the down position. The other arm of the lever extends into the path of the cam 54, as seen in Fig. 1, and so that as the cam 54 advances under the rotation of the ratchet-wheel 40 it will strike the projecting arm of the lever 55 and turnthat arm outward, as seen in broken lines, Fig. 1, and so as to bring the otherarm of the lever onto the beveled end of the dog 53 and correspondingly force that dog upward, as before described, that its upper end may stand in the path of the retreating carriage to arrest it, as before described, and so long as the cam thus holds the lever with the dog raised the reciprocating movement of the carriage and turret may continue without producing rotation of the turret. The length of this cam is therefore made according to the number of reciprocating movements which it is desired the carriage and turret should re ceive without change of tool. So soon as the lever escapes from the cam the dog 53 drops and leaves the carriage free to resume its full movement, by which rotation will be imparted to the turret. The rotation of theratchetwheel continues, notwithstanding there is no rotation of the turretyfor the reason that the extent of movement of the tool for each operation is varied, and therefore requires an independent pin for each movement. As the pawl 4.1, which operates theratchet, necessarily moves with the carriage, and because of the stopping of the carriage before the eX- treme rear position is reached, as before described, it is necessary that the dog should escape from the ratchet-wheel before the extreme retreat of the carriage is reached, otherwise the dog beingengaged with the wheel 40 would turn the wheel to a greater extent when the carriage made its full'retre'at than when it was stopped prior to such extreme rear position. Therefore to produce the proper action of the pawl upon the ratchet, it is thrown out of engagement with the ratchet so soon as the required movement of the ratchet is made. To thus throw out the pawl a finger 56 (represented in broken lines, Fig. 3) is attached to the pawl and is adapted to' ride upon the shaft 38. Thus riding upon the shaft the pawl is out of engagement with the ratchet, as seen in Fig. 3; but when the carriageadvances the tinger escapes from the shaft and drops, as seen in Fig. 3, so as to bring the pawl into engagement with the ratchet that on the next retreat of the carriage it will impart a step in rotation to the wheel 40, and so soon as that rotation is accomplished the back of the finger strikes the shaft 38 and operates as a cam to throw the pawl -11 out of engagement with the wheel and leave it free to retreat with the carriage without effect upon the ratchet-wheel 40, as seen in Fig. 3; but this escape of the pawl from the wheel must occur on or before the carriage will reach the position to be stopped by the dog 53.

As the article is placed in the lathe for turning-such, for illustration, as the arbor represented in Fig. 5-it is a common practice in hand operation for the workman to place the end of his tool beneath the arbor or article,and, using his tool as a lever over the rest, bear upward upon the article while it is revolving rapidly, which will bring the article to a true and central line. This truing up is as desirable in a lathe with the turret attachment as when the work is to be performed by hand.

To provide a means for thus truing up the work, a sliding finger 57 is arranged at the rear of the mandrel and spindle and so as to move in a line at right angles to the axis of the article to be operated upon. A forwardand-back movement is imparted to this finger by means of a hand-lever 58, hung upon a fulcrum 59 below and connected to the finger at its rear end and so that by pulling the lever forward the finger will be advanced, or forcing the lever backward the finger will correspondingly retreat. The finger works through a post 60, and at its forward end the upper side is inclined upward and rearward and so that as the finger advances it will pass. under the article in the lathe to be operated upon, that article revolving, and so that the inclined surface will produce an upward force upon the revolving article substantially the same as does the lever-like action of the tool in the hand of the operator, as before described and as represented in broken lines, Fig. 3. The elevation of this finger may be adjusted with relation to the diameter of the article in the lathe, and this may be accomplished by raising or lowering the stud 61, which stands beneath the finger and over which the finger moves.

The illustration of the invention as adapted for turning clock-arbors will be sufficient to enable others skilled in the art to adjust the lathe for various purposes to which it is adapted.

, While preferring the mechanism hereinbefore described for imparting to the turret its rotative movement, it will be understood that IIO any of the known mechanisms for performing this operation may be substituted therefor. The invention is therefore not to be understood as limited to any specific mechanism for imparting the intermittent rotationto the turret; but

What is claimed is i 1. As an attachment for a lathe, the slide arranged on the bed and adapted for longitudinal movement thereon, the carriage on said slide arranged for reciprocating movement in a path at right angles to the path of movement of said slide, a turret on said car-- riage adapted to rotate upon a vertical axis, mechanism, substantially such as described, between the said slide and turret, whereby under the reciprocatingmovement of the car-v riage and turret a rotative movementwill be imparted to the turret during the last part ofits retreating movement, a ratchet-wheel arranged upon said slide and in a plane parallel with the path of movement of said carriage, a pawl on said carriage adapted to engage the teeth of said ratchet, the said wheel provided with a series of pinsprojecting longitudinally therefrom, and a stationary stop against whichsaidpins are adapted to successively bear to arrest the longitudinal ,movement of the slide, substantially as described. f 2. As an attachment for lathes, the combination of a slide H, arranged to move longi tudinally on the bed of the lathe, a carriage m, arranged uponsaid slide to reciprocate in, a path at right angles to the path of movement of said slide, mechanism, substantially such as described, to impart rotation to said; turretduring the last part of the retreating movement of the carriage, a stop upon the slide adapted to arrest the movement of the carriage at its extreme retreating position, and a dog, as 53, arranged in the slide andf adaptedtto'betbrought into positionto arrest: the carriage before it reaches its extreme rear movement,a ratchet-wheel 40, supported in said slide and so as tomove therewith, a pawl on thecarriage,arranged to engage the said ratchet in the retreating movement of the carriage, thesaid ratchet-wheel provided with a series of pins projecting longitudinally therefrom and corresponding to more or less of-the tools in the turret, with a stop against which said pins are adapted tobear at a pre-j determined point in the longitudinalmovement of said slide, anda lever 55, adaptedto operate upon said dog 53, with a cam 54 on said l'atchehwheel, arranged to engage the said lever 55 ata predetermined point and fora predetermined length of time, substantially; asdescribed. 3. Asan attachmentfor a lathe, the combination of a slide arranged onthe bed of the latheand so as to be moved longitudinally thereon, a carriage arranged on said slide and so as ,to reciprocate in a path at right angles to the path of movement of said slide, a turret tially as described.

t. As an attachment for a lathe, the combination of a slide arranged upon the bed of the latheand so as to be moved longitudinally thereon, a carriage arranged upon saidpslide and so as to reciprocate in a path at right angles to the, path of movement of the said slide, a turret arranged upon said carriage upon a vertical axis and so as to, rotate thereon, mechanism between saidslide andturret, whereby rotative movement will be imparted to said turret during the last part of the retreating movement of said carriage,a finger arranged at the rear and so as to slide backward and forward toward the turret, and mechanism, substantially such as described, to impart said sliding movement to said finger, the said'finger constructed with an upward and rearwardly inclined surface at its forward end, substantially as and for the purpose described.

5. In a turret attachment for lathes,'the combination of the slide l-I, arranged upon the bed of the lathe and so as to move longitudinally thereon, a carriage m, arranged gup: on said slide and so as to reci procate in a path at right angles to the path of movement of said slide, a turret arranged upon said carriage andso as to rotate upon a vertical axis thereon, the turret carrying a seriesof tools, mechanism between the slide and turret,

whereby a rotative movement is impartedto said turret during the last part of 'the retreating movement of said turret, a leading-screw N, arranged below but parallel with the path of said slide, said screw havinga portionof' its thread right hand and another portion of its threadlefthand, stirrups S and T,'l1ung to said slide and carriage, respectively, and'halfnuts W and IR, adapted to engage the, corresponding threaded portions of said screw,-with mechanism, substantially such as described, to draw. said nuts into and take them out of engagement with their respective portions of the screw, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

FREDERIC A. LANE.

Witnesses.

FRED C. EARLE, LTLLIAN D. KELSEY.

IIO

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