US481717A

US481717A - Lathe

Info

Publication number: US481717A
Authority: US
Publication date: 1892-08-30
Anticipated expiration: 1909-08-30

Description

(No Model.) 7 Sheets-Sheet 1.

C. G. RICHARDSON.

LATHE.

No. 481,717. Patehted Aug. 30, 1 92.

Fig.1,

Inventor: Charles GJZ/ichurdson,

Witnesses:

rauay 7 Sheets-Sheet 2.

(No Model.)

0. G. RICHARDSON.

LATHE.

Patented Aug. 30, 1892 Clmrles G.Ric1wrds on,

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s Q :4 J1 H I Ma H I L N \\N\\ V m H W W H M II}! A F a Witnesses: waim. 13mm 7 Sheets-Sheet 3,

(No Model.) I

, G. G. RICHARDSON.

LATHE.

Patented Aug.. 30, 1892.

I V I Inventor:

Wihwsses:

harles\G.B/i1:dson,

0 3mm. Q'WM/ CM (No Model.) 7 Sheets-Sheet 4.

G. G. RICHARDSON. LATHE.

No. 481,717. Patented Aug. 30, 1892.

Witnesses: Iwpenlnr: z/Uaifim Charles? harflson, 9

Atkorweyms Mama ravens cu, FHOTO-LITNO. WASNINGTBN, n. c.

(No Model.) 7 SheetsSheet 5 G. G. RICHARDSON. LATHE.

No. 481,717. Patented Aug. 30, 1892.

I wiwum p wwitngsses Invnior:

gum Gmardson,

(No Model.)

Witnesses.-

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V 7 Sheets-Sheet 6.

G. G'. RICHARDSON. LATHE.

P nted Aug. 30, 1892.

H l lwenlor:

Charles GB/idwrdson,

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JiHmrney NITED STATES PATENT FFICE.

CHARLES G. RICHARDSON, OF BOSTON, MASSACHUSETTS.

LATHE.

SPECIFICATION formingpart of Letters Patent No. 481,717, dated August 30, 1892.

Application filed January 25, 1892- Serial No. 41911 6 (N 111061619 To all whom it may concern.-

Be it known that I, CHARLES G. RICHARD- SON, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and usefullmprovements in Lathes, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to that class of lathes which are provided with a series of cutting tools supported and carried by an intermittently-revoluble carrier, and which are usually termed turret-lathes; and it consists in certain novel features of construction, arrangement, and combination of parts, which will be readily understood by reference to the description of the drawings and to the claims hereinafter given and in which myinvention is clearly pointed out.

Figure 1 of the drawings is a front elevation of a lathe illustrating myinvention. Fig. 2 is a central, vertical, and longitudinal section through the head-stock and the parts of the bed in proximity thereto. Fig. 3 is a vertical transverse section on line 1 1 on Fig. 2, looking toward the left of said figure. Fig. 4 is a similar section on line 2 2 on Fig. 2, looking in the same direction. Fig. 5 is a transverse section through the bed on line 3 3 on Fig. 1 and showing the turret or toolcarrying ring and the head-stock in elevation. Fig. 6 is a transverse section on line 4. 4 on Fig. l and showing the turret or tool-carrying ring in elevation. Fig. 7 is a sectional elevation of the central portion of the machine, the cutting-plane being on line 5 5 on Fig. 5. Fig. 8 is an elevation of a portion of the bed, the rack, and the gears for feeding the tool-carrier and its carriage toward and from the head-stock. Fig. 9 is a central, vertical, and longitudinal section of a portion of the bed and of the turret or tool-carrying ring and its carriage. Fig. 10 is apartial horizontal and longitudinal section of the bed and shows in plan the mechanism for revolving the tool-carrier and locking the same. Fig.

11 is an elevation of a short section of the hand-operated shipper-bar for operating the friction-clutch. Fig. 12 is an elevation of a portion of the shaft that carries the rest-bars for regulating the lengths of feed of the turret-carriage and the ratchet mechanism for intermittently rotating the same. Fig. 13 is a partial transverse section on line 6 6 on Fig. 9. Fig. 14 is a partial section on line 7 7 on Fig. 13 and Fig. 15 is a sectional plan of the radius-arms, worm, and pinion of the carriage-feeding mechanism.

In the drawings, A is the bed of the machine, provided with the ways A A and supported at one end by the pier-like tool-closet B and at its other end by the leg B, the foot of which sets in the oil-receiving pan O,sup ported at one end by the closet B and at its other end by the leg O, as shown in Fig. 1.

The bed A has secured thereon at one end the head-stock D, which has mounted in suitable bearings therein the hollow spindle E, upon which is mounted so as to be freely revoluble thereon the cone-pulley F and the spur gear-wheel F, said gear F having formed thereon the annular rib F which fits Within the larger end of the cone-pulley F and is held in position on said spindle by the collar G and the sleeve or hub G, both firmly secured to and revoluble with said spindle, and the latter has fitted thereon, so as to revolve therewith and be movable endwise thereof, the friction-wheel H. The friction-wheel H has formed upon its periphery two frustoconical surfaces meeting each other at an angle in the centerofsaid periphery, as shown, and said wheel also has formed in one side thereof, near its periphery, an annular groove, in which is fitted and held in place by the ring a the L-shaped ring I) in such a manner that it may revolve in unison with the gear F whether the wheel H revolves at the same or a different speed or is in a state of rest.

The ring a has formed thereon a series of alternate projections c and recesses c to form one-half of a clutch, as shown in Fig. 3, which when desired engages with a similar clutchring (1, firmly secured to theinner face of the web of the gear-wheel F, as shown in Fig. 2.

The friction-wheel H has formed upon its side opposite the ring a a set of clutch-teeth e, which engage when desired with similar clutch-teeth e on the ring 6 secured to the inner web-plate F of the cone-pulley F, as shown in Fig. 2.

A ring f is fitted within the cone-pullev F, so as to revolve therewith and be freely movable in the direction of the length of said pul- ICO ley to a limited distance, which is determined by the stop-pins f, the inner periphery of said ring being provided with a beveled surface to fit one of the frusto-conical surfaces of the wheel H and with the annular shoulder f which engages a similar shoulder on the wheel H, said ring being normally pressed toward the right of Fig. 2 by the springs g g, interposed between it and the web-plateF said web having formed therein recesses g g to receive one end of each of said springs, as shown. A similar ring h is fitted within the annular rib F of the gear F, so as to revolve therewith and be freely movable therein in the direction of the length of the spindle E, said movement being limited in both directions by the stop-pin h, and the inner periphery of said ring being beveled to fit one of the frusto-conical surfaces of the wheel H and also provided with the annular shoulder 7L2, against which the side of the wheel H abuts when moved into contact therewith, said ring it being normally pressed toward the wheel H by the

springs

72,3 7L3, set in recesses in the web of the gear-wheel F, as shown in Fig. 2.

I is a shipper-ring fitted to and movable around and lengthwise of the collar G and having formed in its periphery the annular groove 4; to receive the blocks t z, mounted on studs set in the ends of the forked arm of the shipper-leverJ, as shown in Figs. 2 and 4.

The shipper-ring I is connected to the L- shaped ring I) by a plurality of studs y, so that a movement of said shipper-ring in either direction lengthwise of the spindle E will cause a corresponding movement of the frietion-wheel H, causing it to engage with one or the other of the rings for h and by the friction between their contiguous surfaces cause the spindle to revolve in unison with the cone-pulley F or the gear-wheel F, according as to whether the shipper-ring is moved toward the left or right of Fig. 2. The first part of the movement of the shipper-ring I and the friction-wheel II in either direction will cause frictional contact between said wheel H and one of the ringsf h, and a further movement of said parts in the same direction will cause an engagement of the toothed clutch on one side or the other of said wheel 11, the ring f or it yielding to permit said further movement.

The shipper J has an arm j, the movable end of which is fitted to and acted upon by the cam-slot j", formed in the shipper-bar J, fitted to and movable endwise in a bearing in the head-stock D, as shown in Figs. 1, 2, 5, and 11.

The cone-pulleyF has firmly secured upon its left-hand hub the spur-pinion K, which engages with the gear-wheel K, secured upon or formed in one piece with the sleeve K mounted upon the shaft L, said sleeve having formed upon or secured to its opposite end the pinion K which engages with the gear F, all as shown in Figs. 2, 3, and 4E.

The shaft L is mounted in bearings in the head-stock D and has secured to its righthand or inner end the frusto-conical collar or hub k, the purpose of which will be hereinafter described.

The bed A is composed of the sides A A having the ways A formed upon their upper edges, the central longitudinal bar A and a plurality of cross-ties A, in addition to the two end ties A and A, as shown in Figs. 2, 9, and 10.

M is a carriage fitted to and movable endwise of the ways A, a portion of which surrounds the bed in the form of a ring or hoop M, which encircles said bed and has fitted thereon, so as to be revoluble about said bed, the annular tool or work carrier N, having a polygonal periphery, all as shown in Figs. 6, 7, and 9. The tool or work carrier N has secured thereto or formed therein the internal gear I and is secured in place upon the ring M of the carriage by the annular follower M as shown in Fig. 9. The carrier N has a portion of its length at the end opposite the follower M made circular and is provided at said end with the annular lip Z, which incloses the flange of the ring R and has formed in its inner surface the annular groove 1 and said carrier also has formed in said end a series of cylindrical recesses m, corresponding in number to the number of flat surfaces upon the periphery of said carrier, each of said recesses having secured therein a hardened-steel bushing m, having a conical bore or cavity, with which the frusto-conical end of the locking-bolt m fitted to and movable endwise in a bushed bearing in the boss M on the upper side of the carriage M, engages, as shown in Fig. 9. The bolt m has a slot out transversely through it and has formed in its inner end a cylindrical recess to receive the coiled spring at, which tends to hold said bolt normally in engagement with the bushing an, as shown in Fig. 9.

N is a gear-wheel mounted 011 the stud at, set in the carriage M, the teeth of which eugage with the teeth of the internal gearland also with the teeth of the pinion N mounted upon the shaft 0, so as to be revoluble therewith and movable endwise thereof, as shown in Fig. 9 and in dotted lines in Fig. 6.

The shaft Q is mounted in hearings in the end of the bed and one of its cross-ties, so as to be movable endwise therein to a limited extent and revoluble about its axis, and has secured to its left-hand end the coupling-hub O, which fits into and is firmly seen red to the frictional sleeve 0 the bore of which is made partly cylindrical and partly f rusto-conical to fit the frusto-conical hub or collar 7.:, secured on the inner end of the shaft L, as shown in Fig. 10.

By the side of the shaft 0 and parallel with it is mounted in bearings in the same cross connections of the bed, so as to be similarly movable endwise therein, the screw-shaft 0 provided on its outer end with the hand-wheel O, by which it may be revolved, said shafts IIO 0 and 0 being connected together by the tieblock 0 through which both shafts pass, but are prevented. from moving endwise therein by the collars o 0 and 0 0, as shown in Fig. 10.

P is a block fitted to and movable freely endwise on the shaft 0 and having a threaded bearing on the screw-shaft O and P is a hook-like pawl pivoted to the upper side of said block by the stud 0 and provided at its movable end with the upwardly-projecting wedge-shaped lug o and near the middle of its length with upwardly-projecting arm 0, said pawl being normally pressed into contact with the stop-pin 0 by the spring 0, as shown in Figs. 9 and 10.

P is a lever mounted on the fulcrum-pin 10, set in the carriage M, and engaging at its upper end the slot in the locking-bolt m and having its lower arm so arranged as to be engaged by the lug 0 when the carriage is moved toward the right of Figs. 1, 7, 9, and.

10, and thus retract the locking-bolt m against the tension of the spring a.

The shaft 0 has fitted thereon between its right-hand bearing and the collar 0 a coiled spring p, which serves to press the shafts O and 0 toward the left of Fig. 10 when the downwardly-projecting portion M of the carriage is moved away from contact with said block P, and thus release the contact of the conical surfaces of the hub and the sleeve 0 The carriage is held down upon the ways A and prevented from being lifted by means of the plates or a, secured to the under side of the upper plate of the carriage at its front and rear edges and projecting under the outwardly-projecting portions of the ways, as shown in Figs. 5, 6, and 7.

The front edge of the upper plate or the main body of the carriage has firmly bolted thereto and pendent therefrom the outwardly-curved apron Q, to the inner side of which are bolted the pendent stands or hangers R, R, R q, and q and the inwardly-projecting bracket R as shown in Figs. 5 and 7. The plate Q also has formed thereon the outwardly-projecting hub Q,in which and the hanger q the shaft S has its bearings, said shaft having firmly secured thereon the spur gear-wheel S, the pinion S and the hand-wheel S as shown in Fig. 5. The pinion S engages with and imparts motion to the gear-wheel S, which in turn engages with the teeth of the rack T, firmly secured to the front side of the bed, as shown in Figs. 5, 6, 7, and 8. The shaft S has also mounted loosely thereon one end of each of two radius-arms S and S which extend horizontally toward the headstock and are connected together at their movable ends and have mounted in suitable bearings therein a short shaft S upon which are mounted the Worm-wheel S and the pinion S the teeth of said pinion engaging with and imparting motion to the gear-wheel S,

and said worm-wheel S being rotated by the worm S mounted upon a shaft having bearings in the hangers R and R and having se- T and T and having firmly secured thereto near its left-hand end the ratchet-wheel r, and also has loosely mounted thereon the twoarmed lever 4', having pivoted to one end thereof the pawl r to engage said ratchet and to its other end one end of the connectingrod W, the other end of which is connected to the upper or movable end of the lever U, firmly secured to one end of the rocker-shaft U mounted in suitable bearings on the bed A and having firmly secured thereon the two levers U and U, the free ends of which are connected together by the bar or rod U as shown in Figs. 3, 4, 6, and 10.

V is a lever pivoted to the follower-rin g M with its free end in position to bear against the bar U and V V are a series of camplates corresponding in number to the number of flat sides on the tool or work carrier N, said cam-plates being secured to the end of said carrier next to the head-stockone at each angle of said carrier-and so arranged relative to the lever V as to act thereon successively to vibrate said lever, and thus move the bar U and the levers U, U and U about the axis of the rocker-shaft U and through the rod r and lever 7" cause the pawl r to impart to the shaft U an intermittent movement about its axis.

The shaft U has firmly secured thereon one or more longitudinally-grooved hubs or cylinders WV, in the grooves of which is adj ustably fitted a series of bars 8 3, corresponding in number to the number of flat sides on the tool-carrier, which bars may have smooth and straight outer edges, or they may have formed in said outer edges rectangular notches, as shown at the right hand end of Fig. 7. The rocker-shaft U the levers V, U, U and U and the pawl-carrying lever r are returned to their normal positions after the passage of a cam-plate V by the reaction of the spring V (see Figs. 3 and 4,) and the outward movement of the lever V is limited by the stop-pin s, the ratchet 1' being prevented from moving backward by the stop-pawl r The free or movable ends of the levers or radius-armsj The spindle E carries at its inner end a chuck E, which may be of any usual or wellknown construction, except that it must have a central opening through the same corresponding to the bore of said spindle, and said spindle is also provided near its out-er end with a plurality of radially-arranged set-- screws 25 t to serve as a means of centering and guiding pipes or rods inserted through and clamped by the clutch and upon which the tools carried by the annular tool-carrier are to operate.

The shaft S has a spline-groove formed therein, which extends a greater part of the length of said shaft, by means of which and a suitable key the pinion S is made to revolve therewith, while it is free to move endwise thereon when the carriage M is moved in either direction along the ways A. The downwardly-projecting portion M of the car riage M is slotted to embrace the shaft 0, as shown in Fig. 6, and is also slotted transversely of said shaft, so as to receive the pinion N between two parts of said pendent lug and compel said pinion to move along said shaft 0 with the carriage M. The carriage M has set therein just above the front guideway A and at right angles thereto the pushpin it, the inner end of which is normally in a plane just outside the arm 0 of the pawllever P, and its outer end projects into the annular groove Z in the inner surface of the annular ring Z of the tool or work carrier N, said push-pin 11. being surrounded by the coiled spring to, which tends to force said pin outward, so that its outer end will project into the groove Z and into the path of the inner ends of the series of pins 1;, set in the cylindrical portion of the tool-carrier, one just outside of each angle of the polygonal portion of said carrier in positions parallel to the axis of rotation of said carrier, as shown in Figs. 6, 13, and 14.

The tool-oarrier N may have secured thereon as many tool-holders and back-rests or worksupports as there are flat sides formed on its periphery, and said tool-holders may be of various forms.

I have illustrated one form of a box toolholder and back-rest combined of novel construction, the same being shown secured to the annular tool or work carrier in Fig. 6 and drawn to an enlarged scale in Figs. 15, 16,17, and 18, in which 1V is the base-plate, provided with holes to w to receive the bolts for securing it to the tool or work carrier and having formed in its upper side the grooves 10 and 10 in the former of which is fitted so as to be adjustable therein the stand XV", in which is mounted so as to be revoluble therein the shaft 10 having formed upon one end the slotted head V and having firmly secured upon its other end the worm-wheel as shown in Figs. 16 and 17. The upper end of said stand projects outward over the worn1-wheel and is forked to form two bearings for the shaft of the worm V upon one end of which shaft is secured the crank W, by which said worm may be revolved to move the worm-wheel and the hub or head VV about its axis to adjust the angle of the cutting-tool X, adjustably secured in the slot of the head V by the set-screw 10 as shown. The stand 1V is firmly secured in the proper adjusted position upon the baseplate 7' by means of the bolt n2 passing through the slot to in said stand and screwed into the base-plateW', as shown. The groove 10 is dovetailed and has fitted so as to be movable endwise therein the stand Y, having a central opening cut through it for the passage of the pipe, rod, or other piece of work to be operatedupon, said stand being slotted vertically to receive the two levers Y and Y which together serve as a back-rest to support the work. The short arms of these back-rest levers are connected together by the spring as, and their longer arms may be adjusted toward and from each other by the set-screws as and :0 as shown in Figs. 15 and 16. The front end of the stand Y is made L-shaped, and the inner portion of its baseflange has formed therein a series of rackteeth, with which a series of teeth .2, formed on a segment of the periphery of the head lV engage, so that when the head WV is turned to advance and lower or retract and raise the point of the tool X the stand Y and the back-rest Y Y will be moved toward or from said tool simultaneously with said movements of the cutting-tool.

The operation of my invention is as follows: The work being passed through the hollow spindle E so as to project through the chuck E the desired distance and adjusted to a central position therein by the chuck E and the set-screws it and the tool-carrier having securedon its peripherythepropertool-holders fitted with suitable tools for the job in hand, the carriage is moved toward the right of Fig.1 to the proper position for beginning the work by turning the hand-wheel S the worm-wheel S being thrown out of engagement with the worm S by dropping the movable ends of the radius-arms S and S upon the bracket R The screw-shaft O is then revolved by its hand-wheel O to bring the block P and the pawllever P into the position relative to the lever P (shown in Fig. 9,) thespring o yielding to allow the wedge-shaped lug o to pass the lower end of the lever P if said lever P happened to be at the right of said lugbefore the screw 0 was operated to adjust said block P. One or more of the rest-bars s s, according as to whether there are one or more operations to be performed upon the piece of work in the chuck, are then adjusted longitudinally in their carrying hubs or cylinders to the proper positions, so that one end of each bar or a notch therein shall be at a distance from the hook or shoulder 15 on the lifting-bar V corresponding to the length of cut to be made by the tool to be controlled thereby. The worm-gear S is then raised into engagement with the worm S by raising the radius-arms S S which may be done by lifting upon the handle 3 at the upper end of the lifting-bar V or upon the stud s, set in the movable end of the radius arm S and projecting through a slot in the apron Q, (see Figs. 6 and 7,) when the hook or shoulder s will engage 'with the bar 8 which is in proper position and adjusted to gage the first out, and thus maintain the engagement of the worm-wheel S and the worm S until the cutis completed, the upper end of the lifting-bar V being normally pressed toward the bar 8 by the spring 5. (See Figs. 5 and 6.) The cuttingtools and back-rests being properly adjusted for the diiferent cuts of the several operations and the several parts of the friction-clutch mechanism being in the positions shown in Fig. 2 and power being applied to the conepulley F, the hand shipper-bar J is pushed inward or drawn outward, according as a fast or slow rotation of the work is required, the effect of which is to cause an engagement of one of the frusto-conical surfaces of the wheel H with a ring f or 7b with suliicient friction to cause said wheel H and the spindle E to commence to revolve, the springs g or 71 yielding, so that the ring f or it may move lengthwise of the spindle after said frictional contact has taken place, so that the toothed clutch on one side or the other of the wheel H may be made to engage, the tension of the springs g and 7L3 being so proportioned or adj usted as to permit sufficient slip of the frictional surfaces to insure such engagement of the toothed clutch if the two parts happened to be in positions relative to each other unfavorable to direct engagement without a partial rotation of one of the parts relative to the other. The work is thus revolved in unison with the spindle E, and the shaft S is rotated at the desired speed through the medium of the cone-pulleys D and T and a suitable belt connecting said pulleys, and the shaft L is also revolved by the action of the pinion K upon the gear-wheel K through the pinion S the gear 8, the worm S, the worm-wheel S pinion S gear S, pinion S gear 8*, and the rack T, causes the carriage and the tool-carrier to be moved toward the head-stock D until the limit of the cut desired is reached, at which time the rear side of the shoulder s on the lifting-bar V reaches the left-hand end of the rest-bars upon which it has been supported, or the rear side of a notch in said bar, and is released from support, and the movable ends of the radius-arms S S fall by the force of gravity, thus disengaging the worm-wheel S from the worm S and the feed of the carriage is arrested. The

operator then turns the hand-wheel S about its axis in the proper direction to move the carriage toward the right-hand end of the bed A, or away from the head-stock, until the lower end of the lever P comes in contact with the lug 0 of the pawl P, and said lever P is moved about its fulcrum-pin, so as to retract The rotation of the shaft S acting the locking-boltm from engagement with the bushing h when the pendent lug M of the the carriage M comes into contact with the end of the block P and moves it and the shafts O and 0 toward the right against the tension of the spring 19 a sufficient distance to cause a frictional contact between the frusto-conical hub is and the sleeve 0 of adequate force to cause said shaft 0 to revolve and through the medium of the pinion N the gear-wheel N, and the internal gear Z cause the tool carrier to be moved about its bearing on the carriage until one of the pins 12 comes into contact with the outer end of the push pin it and moves it inward a sufficient distance to move the pawl P around its pivot until the lug o is removed from the path of the lever P at which time the operator releases the pressure on the wheel S when the reaction of the spring a will throw the bolt in into engagement with the bushing mand lock the tool-carrier N against further revolution, when the f riction-surfaces of the hub 79 and sleeve 0 will slip to prevent breakage of the parts. During the partial rotation of the tool-carrier, as above described, one of the cam-plates V strikes the leverV and moves it about its pivot, thereby moving the bar U and the levers U, U and U about the axis of the rocker-shaft in the direction indicated by the arrow on Figs. 3, at, and 6 and through the rod r and the lever q" causing the pawl r to move the shaft U aboutits axis an angular distance equal to the distance between two of the bars .9 3, carried by said shaft, when the radius-arms S S are raised by the operator to throw the wormwheel S into engagement with the worm S and cause the shoulder s on the lifting-bar V to engage the bar 3 brought into position by the last partial rotation of the shaft U, when the carriage will again be fed forward toward the head-stock until said lifting-rod is disengaged, as before, from its supportingbar 8.

In certain cases when it is necessary to turn long rods or pipes that project a considerable distance beyond the chuck toward the right I reverse the operation of the machinethat is, I move the carriage by hand to the left in close proximity to the chuck and do the turning or cutting of the work while the carriage is being fed automatically toward the right, or away from the head-stock, the feeding of the carriage being arrested by the lifting-bar V dropping from the right-hand end of the bar 8 or a notch therein, the operating-tools being properly constructed and adjusted to the changed conditions.

The advantages of my invention are tha the tool-carrier may be increased in size, and consequently in capacity for holding a larger number of tools, without occupying anymore space on the top of the lathe-bed or raising its uppermost side any higher. Only one toolholder is uppermost at the same time and that the one that is operating upon the work. The

tool-carrier is rotated automatically, and the limit of the out is automatically determined in all cases, whether the cut is made by feeding the carriage toward or from the chuck.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In a lathe, the combination of a work holding and rotating chuck, a bed provided with suitable ways, a carriage supported by and movable endwise of said ways, and an annular tool-carrier surrounding said bed and supported by said carriage and having provision for securing the cutting-tool holders to it.

2. The combination, in a lathe, of a bed having suitable ways, a work holding and rotating chuck carried by said bed, a carriage mounted upon and movable along said ways and provided with a ring-like portion extending around said bed, and an annular carrier fitted to said ring-like portion of said carriage and surrounding said bed, mechanism for antomatically moving said carrier about said bed and carriage, and means having provision for locking said carrier after each intermittent partial rotation.

3. The combination,in a lathe, of a bed having suitable ways, a work holding and rotat ing chuck supported by said bed, a carriage mounted upon and movable endwise of said Ways, a tool-carrier mounted on said carriage and revoluble thereon, a toothed rack secured in a fixed position on said bed, a worm carried by said carriage, a worm-wheel and a train of gears interposed between said rack and worm, said worm-Wheel and certain of the gears being carried by pivoted radius-arms, a revolving shaft driven or operated from any suitable source of power, suitable gears for imparting motion from said shaft to the worm, an intermittently-revolving shaft, a ratchetand pawl mechanism connected with said shaft, a series of cams on the tool-carrier for operating said ratchet-and-pawl mechanism, a series of rest-bars arranged around, carried by, and adjustable lengthwise of said shaft and a lifting-bar for raising said worm-wheel into contact with the worm and constructed and arranged to maintain such contact by engagement with one of said rest-bars,whereby the length of feed of the carriage and toolearrier is determined by the distance from said lifting-bar at the start to the end of said bar or a notch therein where said lifting-bar is disengaged.

4. The combination, in a lathe, of a bed having suitable Ways, a Work holding and rotating chuck, a carriage mounted upon and movable endwise of said ways and surrounding said bed, an annular tool-carrier mounted upon said carriage and surrounding it and said bed and having a polygonal outer periphery fitted to receive a tool-holder on each of the fiat sides of the polygon, a bolt for looking said carrier, a series of sockets in said carrier to receive said bolt, a constantly-revolving shaft operated from any suitable source of power, a second shaft, a friction-clutch mechanism interposed between said shafts and adapted to connect them and cause said second shaft to revolve, a pinion on said secon d shaft revoluble therewith and freely movable endwise thereof, an internal gear mounted on said carrier and adapted to be revolved about its axis by the revolution of said pinion, a lug pendent from the upper portion of the carriage and slotted to embrace or straddle said shaft and pinion and adapted to engage and move the pawl-carrying block, an adjustable block, a pawl pivoted to said block and provided with an upwardly-projecting wed ge-shaped lug, a two-armed lever pivoted to the carriage and engaging the locking-bolt by one of its ends and having its opposite end in position to engage said wedge-shaped lug, means having provision for adjusting the pawl carrying block on its shaft and means having provision for holding said block in position on its shaft without interfering with the rotation of said shaft, and a spring constructed and arranged to permit a slight endwise movement of said pinion carrying shaft.

5. The combination, in a lathe, of the bed A, provided with ways A A, awork holding and rotating chuck, the carriage M, the carrier N, a constantly-revolving shaft operated from any suitable source of power and provided with the friction-clutch hub 70, the shaft 0, provided with a longitudinal spline-groove and the female coupling-sleeve 0 the pinion N the spur-gear N, the internal gear Z, mounted on the carrier, the blockP, movable endwise on the shaft 0, the pawl P, provided with the wedge-shaped lug o and the arm 0, the spring 0, the screw-shaft O fitted to a threaded hole in the block P, the tie-block 0, connecting said shafts, as set forth, the spring 9, the lever P the locking-bolt m the spring at, a series of bushings on, set in the carrier, the push-pin a, mounted in the carriage, as set forth, the spring 16, and the series of pins r, set in the carrier and adapted to act upon said push-pin to move it endwise to trip the pawl P from engagement with the lever P to allow the locking-bolt to engage with said bushings.

6. In a lathe head-stock, the combination of a chuck-carrying spindle, a cone-pulley mounted loosely thereon and carryingaspurgear, a gear-wheel also mounted loosely on said spindle between two collars or sleeves firmly secured to said spindle, suitable gears connecting the gear on the cone with the gear on the spindle,afriction-Wheel mounted upon said spindle, so as'to be revoluble therewith, and movable endwise thereof and having its outer periphery composed of two frusto-conical surfaces, two friction-rings fitted one within the cone-pulley and the other within the rim of the gear loosely mounted on the spindle, said rings having their inner surfaces shaped to fit the frnsto-conical surfaces of said friction-wheel and being connected to said cone and gear, so as to be revoluble therewith and movable therein toward or from each other, springs for moving said rings toward each other, a toothed clutch on each side of said friction-wheel, and a shipper mechanism constructed and arranged to move said friction-wheel lengthwise of said spindle in either direction and cause it to first engage one of the friction-rings and then one of the positive clutches.

7. In a lathe, the combination,with the bed and a carriage mounted on and movable endwise of said bed, of a tool-carrier mounted on said carriage and intermittently revoluble thereon, a constantly-revolving feed-shaft, a train of feed gearing constructed and arranged to be thrown into and out of connection with said feed-shaft, an intermittentlyrevoluble shaft, a series of rest-bars arranged around and parallel to said shaft and adjustable lengthwise thereof, and a lifting-bar for raising the train of feedgearing and provided with a shoulder to engage said rest-bars, substantially as described.

8. The combination, in alathe, of a bed having suitable ways, a Work holding and rotating chuck supported above said bed, a carriage mounted upon and movable endwise of said ways, a tool-carrier mounted upon said carriage and revoluble thereon, a rest-bar supported by and adjustable lengthwise of said bed, a bar or lever mounted upon and movable with said carriage and constructed and arranged to bear upon said rest-bar durin g the movement ofsaid carriage and adapted to drop off the end of said rest-bar or through a notch cut therein, and mechanism interposed between said bar or lever and said carriage whereby the movement of said carriage will be stopped by the disengagement of said bar or lever from said rest-bar.

9. The combination, in a lathe, of a bed having suitable ways, a work holding and rotating chuck supported above said bed, a carriage mounted upon and movable endwise of said ways, a tool-carrier mounted upon said carriage and revoluble thereon, a series of rest-bars supported by and independently adjustable endwise of said bed, mechanism for throwing either of said rest-bars into position for action, a bar or lever mounted upon and movable with said carriage and constructed and arranged to engage with or bear upon the rest-bar in action during the movement of said carriage and adapted to drop off the end of said bar or through a notch cut therein, and mechanism interposed between said bar or lever and carriage whereby the movement of said carriage will be stopped by the disengagement of said bar or lever from said restbar.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 13th day of January, A. D. 1892.

CHARLES G. RICHARDSON.