US2334616A - Power feed compound slide rest for lathes - Google Patents

Description

Nov. 16, 1943. E. R. FIORELL] POWER FEED COMPOUND SLIDE BEST FOR LATHES Filed Aug. 4, 1940 6 Sheets-Sheet 1 m3 Nd E //VVENTOR ERNEST R. F/OREL LI I ATTORNEY Nov. 16, 1943. E; R. FlORE LLl POWER FEED COMPOUND SLIDE REST FOR LATHES Filed Aug. 4, '1940 6 Sheets-Sheet 2 w UE Nov. 16, 1943. E. R. FlORELLl POWER FEED COMPOUND SLIDE REST FOR LATHES E. R. FIORELLI Nov. 16, 1943.

POWER FEED COMPOUND SLIDE REST FOR LATHES Filed Aug. 4, 1940 6 Sheets-Sheet 4 //\/VE/\/ TOR WmAMM ATTORNEY w E m F R T 5 E N R E Nov. 16, 1943. E; R, FIORELLI 2,334,616

POWER FEED COMPOUND SLIDE REST FOR LATHES Filed Aug. 4, 1940 6 Sheets-Sheet 5 FIG 35 FIG. 34-

FIG.33

/6 FIG. 37

INVENTOR ERA 57 R. F/OAELL/ BY WW. $.M6M

ATTORNEY 6 Sheets-Sheet 6 E. R. FIORELLI POWER FEED COMPOUND SLIDE REST FOR LATHES Filed Aug. 4, 1940 ITIIIII Nov. 16, 1943.

Illlll I Patented Nov. 16, 1943 POWER FEED COMPOUNDJSLIDE BEST FOR LATHES" 7 Ernest R. Fiorelli, w o-as; M ss. Application August 4. 1940, Serial No. 351,402

' 9 Claims. o1.s2 -24 My present invention relates to so-cal'led bench and other .lathes. More particularlyit aims to provide such lathes with an improvedcompound slide rest for the tools, incorporating various automatic and power-drive features including selective manual and power control for both upper and lower carriage and slide elements, whereby the lathe is universally a'daptedtoja wide range of work and is afforded an increased efficiency and ease of operative control.

In the drawings illustrating by way of example one embodiment of the invention:

Fig. 1 is an endelevation of my compound slide rest as viewed from the rear of the lathe bed, that is, looking from the left in Fig. 2;

Fig. 2 is a vertical section lengthwise said compound slide rest substantially centrally thereof and crosswise the lathe bed, as indicated by the line 2-2 of Fig. 3; V

Fig. 3 is an end elevation opposite that of Fig. 1, as viewed from the front of the lathe bed, that is, looking from the right in Fig 2, operating handles. and shaft extensionsbeing omitted in Fig. 3 for clearness; 1

Fig. 4 is a detail view in vertical section, corresponding to an upper right :corner portion of Fig. 2,, on a larger scale;

Figs. 5 and 6 are sections on the lines 5 -5 and 65 respectively of Fig. 4; i

Fig. 7 is an enlarged detail elevational view corresponding to a right central portion of Fig; 3, showing the relation of certain gears;

Fig. 8 is a vertical section lengthwise the compound slide rest, taken on a plane parallelito but behind that of Fig. 2, substantially as upon the line 8.8 of Fig. 9; 1

Fig. 9 is an end, elevation substantially the same as Fig; 3, reproduced adjacent Fig. 8 for convenience in locating itssectional plane;

Figs. 10,11 and 12 are enlarged detail views. in top plan, Zront, and side elevation respectively,of a clutch actuating element best seen in Figs. 16 and 1'7; 7

, Figs. 13 and 14 are front andend elevations, on

line He l! of Fig. 16, with the spurgear in eleVation;

Fig. is is atop plan of themain elements or my compound slide rest, with" the rear of the lathe bed (that atthe left in Fig.2) at the bottom l i of the figure, said Fig. 18 particularly illustrating certain'stop mechanism; V

Fig. 19 is an end elevation of the mechanism of V Fig. 18 as viewed from the right of the latter;

Fig. 20 'is 'a' front elevation corresponding to Fig..18;

Fig. 2; is a viewpartly in end elevation (similarly as in Fig; 19) and partly in; cross section,

showingtl'lje mechanismof Fig. 20 as if viewed from the right therein, and on the line 2{ 2l of .Fig .-18;

Figx22is a partial verticalvlong itudinal section on line 22-22 of Fig. 18; i

Figs. 23 and 24 are plan views of,a portion of a stop motion for controlling the top slide of my compound mechanism, illustrating different posi-;

tions and settings of said stop motion, for certain right-hand and11eft-hand operations respectively;

Figs.25, 26,27 and 28 respectively are an end view, a top plan, opp o-site end view and partial crosssection illustrating details of a'. lower carriage element of the compound slide' rest, Fig. 28 beingtakensubstantially on the line 2828 of fi f r Figs. 29 and' 31 are vertical sections lengthwise the lower carriage member of Fig. 26, on lines 29-231and 3l3l respectively of said figure;

i Fig. 30is a cross section of the carriage of i Fig. 26 substantially on thelinejfi-Sfl of sai Figs; 32 to 3'7 relate to the lower slide of my compound slide rest,- slidably mounted on the lower carriage of Figs. 25 to 31, Fig. 32 being ;a top plan, Fig. 33, a right end elevation, Figs. 34 and 35 being vertical cross sections on the Simila'rly numbered section lines of Fig. 32, andFig's.

36 and 37 beingviewsilengthwise of Fig. 32 partly in elevation and partly in verticaljsection as] I on the lines 3636 and, 31- 3'l of Sfl'id Fig. 32;

Fig. 36 is an elevational assembly of the compound slide rest as a whole, as viewed from the back of the lathe, similarly as in Fig.1 but with.

the. top carriage and slide turned from their position of Figs. 1 and 2, said Fig. 33 also including the headstock and adjacent end portion of the lathe bed, together with the back gears. and main drive connections forithe compound slide rest;

Fig. 39 is aplan of the at carriage of the slide 7 rest, separately; and

Figs. 40 and 41 are verticalsections on the back gearing of said 38 are to be regarded as typical. I t

Referring to the'drawings in more detail, and particularly to Figs. 1 to 3, 8, 9 and 38, the com;

, or traversing nut II.

pound slide rest as a whole comprises four main-"*- elements, namely, a base or lower carriage I with a lower slide IS, and on the latter a rotary top carriage 8E3, herein fully rotatable through 360 relative to the underlying lower slide and carriage, and in turn slidably supporting a top slide one or more T-slots I08a, Figs. l, 3, 9,18, 19

and 21.. A typical tool clamp 38b is shown in position on the top slide in Fig. 38 t This compound slide rest in itsentirety-is detachably mounted on the lathe bed 2, with capacity for adjustable positioning alon g it as desired. as by means of a stud 3 (Fig.2) fixed on the lower carriage I and extending down through a slot running substantially its full lengthof the lathe bed. This stud and slot connection with the lathe bed permits the entire compound slide rest assembly to beset at any. desiredposition along the lathe bed, the stud 3 moving in said bed slot. The slide rest as a whole is held in selected position lengthwise the lathe bed 2 as by turning up the knurled nut 4 (Fig. 2) on the lower end of the stud 3 into clamping engagement with the under face of the bed..

The lower carriage I is additionally held and.

guidedon the lathe bed as by a beveled face at the upper rear edge of the latter, at'the left in.

Fig. 2. which receives a like-inclinedface on a depending lip 6 on .the lower carriage. The front upper edge of the lathe bed has a like beveled face 8 engageable bya similarly inclined inner face on 'a guide plate I at the under face I0 and II in the under face of said carriage; see' Figs. 3, 8, 28, 29 and 30. The projecting lower ends of said studs 9 are threaded to receivehand clamping levers 5, one of which is seen in Fig. 2. When these levers 5 are released the guide platek'l may be pushed firmly against the inc ined bed face 8, aspermitted by the T-slot connection of. the studs!) with the lower carriage I. Upon then turning up the levers 5 against the under face of theplate I the latter and hence alsov the lower carriage I'are securely clamped aga nstsaid bed-facet r Still referring toFigJZ, and also. to Figs. 16 and 31, thelower carriage I has a longitudinal recess la' housing a feed screw I3 for effecting movement of the lower slide I8, and hence of all parts on and above the latter, in the direction lengthwisethe lower carriage I and transversely of the lathe bed 2. This feed screw is J'ournaled at one end, at th e'left' in Fig. 2, on the adjacent wall of the lower carriage I- and at its other or front'end in a separate end plate I2 demountably secured as byscrews to the corresponding end face of said lower carriage; see also Figs. 26

slide I8. endwise movement, turning thereof in one or the and 27. Provision of such removable end plate I2 facilitates assembly and servicing operations. Near its rear end and within the lower carriage, Fig. .3,the feed screw I3 is held in the axial direction by a collar I6 pinned on it and engageable against the adjacent carriage wall, and by a retaining nut I 4 and washer I5 on its projecting rear end.

This feed screw I3 has a spiral thread formation,: substantially from end to end of the lower carriage I and receiving'a like-threaded traveler On the latter is an upright projection or post 82 (see also Figs. 27, 28, and 31) for operatively connecting it with the lower The feedscrew I3 being held against opposite direction causes th nut IT to traverse lengthwise the screw and lower carriage I and thus correspondingly to move the lower slide I8 and all mechanism supported by it, along and upon the lower carriage I.

Said turning of the feed screw I3 may be effected manually, as by the crank handle I9, Figs. 2 and 15, or by power-operated means, selectively, at the will of the operator. Accordingly the feed screw I3 has mounted on it, within and near the front end of the lower carriage I, at the right in Fig. 2, a collar 22 fixed as by a set screw 23; see also particularly Fig. 16. Positioned on the feed screw I3 between this collar 22 and the end plate I2 is a spur gear or pinion 2|, centrally recessed imparting motion to the feed screw at times when power operationof the latter is not desired. as

determined by the l'atheoperator.

For said purpose! have herein illustrated an expanding clutch device, comprising a split expansion ring 25, shown on the larger scale in Figs.

w 16 and 17 and separately in Figs. 13 and 14. This expansion member 25 is housed in said central recess 24 of the gear 2|,surrounds the adjacent portion of the feed screw, and is adapted to be spread into gripping engagement with the circumferential-inner wall of said recess 2-: by means of an expander or Wedging member 26, carried by the feed screw I3 and slidably movable radially of the latter in a transverse recess 39 therein.

' Said expander member 26 is shown separately in Figsjl0 to 12, and in operative position in Figs. 2, 16 and 17. It has a wedge-shaped head 26a for entering between the split end portions of the 3 expansion ring 25 thereby to spread the latter,

and has an actuating or cam face 21 at its inner portion. This cam formation 21 is operatively contactable by the conical inner end 29 of a clutch-operating rod 28 rotatably supported in an axial bore 3I leading in from the outer front end portionof the feed screw I3. Said portion of the feed screw projects outwardly beyond the end plate I2 of the bottom carriage I, through a spacing and supporting sleeve-like boss 3! on said end plate, and preferably has a knurled knob or the like 36 for turning it to engage or disengage the clutch.

Thefront end portion of said axial bore 3| in the feed screw I3 is tapped as at 33, Fig, 16, for threaded engagement with a like-threaded forward portion 32 of the clutch-operating rod 23. The latter extends out beyond the feed screw and has a knurled operating nut 36 fixed on its projecting end. Means may be provided for securing this-clutch rod 28 in selected adjusted position,

while maintaining the driven connection with the for clutching, orunclutcliing the gear 2| relative to the'feed screw. Such means is'herein illustrated as a washer 34 and lock nut .35 on the clutch rod 28 and engageable against the end face ofthe feed screw. When this operating rod. 28 is screwed in, the wedging member on the feed screw is thereby thrust out into clutch-actuating position, expanding the ring 25 and locking the gear 2| to the feed screwsoasto drive it, by the power connections to be described. By backing out said rod 28 th clutchis correspondingly disengaged and the gearZI unclutched and left free to turn without imparting motion" to the feed screw.

The described.clutch-connectable and releasable gear 2| meshes directly withand is driven by an elongated or sleeve-like spur gear or pinion 39, Figs. 8, 15 and 29, constituting in effect the main driving pinion forthe' various motions of the compound slide rest as a whole. V

For manually operating .thefeedscrew |3 whenever preferred it is herein providedwith a cross bar or crank 38, Figs. 2 and 16, fixed on its outer end as by the key connection 28 best seen in Fig. 15. This crank 38 carries the operating handle 1 9, Fig. 2, previously mentioned, conveniently accessible to an operator at the lathe front.

Considerin furtherthe elongated main drive pinion 3S and thepower drive connections for it,- said pinion 39 has a hub, bearing 40 at itsfront end, at the right in Figs.,2, 8 and 29, rotatably supportedin a bearing aperture 4| in the end platel'. of thelower-carriage At its opposite end said pinion 39 is fixed on a pinion shaft 45 rotatable in an elongated bearing recess 4! at the rear portion of the lower carriage. Sa d pinion shaft 45 projects rearwardly beyond the lower carriage and there has driven connection with the power-operated main'driving shaft 55 paralleling the lathe bed; see Fig. l and particularly 8 and 38.

Said main driving shaft 55'has bearing support in a suitable plurality of hangers 69 secured to the lathe bed as by screws 'll'l, Two such hangers or bearing brackets 59 are seen in Fig. 38, near the respective ends of the lathe bed 2. The shaft 65 is extended beyond these bearing brackets, its projecting ends being reduced and threaded as at 1|, 13 for the reception of retaining nuts l2 and M respectively. I

At the headstock end of the lathe; that at the right in Fig. 38, the drivingshaft 65 has removably keyedon it, between the adjacent bearing bracket 69 and the nut 14, a special back gear 15, adapted to mesh with and be driven by the customary train of back gearing [6, the latter being standard equipment for most lathes. Thus in the present embodiment of my invention said back gear train is utilized as the source of power for the several driven parts of the compound slide rest, when the person in charge of the lathe elects to utilize the power operation. It will be understood that the train of back gearing as represented more or less diagrammatically at 15 in Fig. 38 may include one or more change gears ls'ahead of the shaft 55 so that the latter may be driven in one or the opposite direction as desired and at the appropriate speeds.

The described main driving shaft 55, again as best seen in Fig. 38 and also in Figs. 1, 2 and 8, is provided with a longitudinal keyway 6'! along substantially its full length. This enables the slide rest as a whole to be adjustably positioned at the desired location lengthwise the lathe bed,

shaft 95. g

Noting now more particularly Figs. 1, 2 and 8, the rear end face of the lower carriage I has removably secured to .it as by screws 54 a combined bracket, gear guard and support 55, including opposed half-circular upper and lower gearhousing or guard members .59 and 5|, the'latter detachably secured as by screws 55 to the upper housing section 50 which in turn is hereinintegral with the bracket 55. This sectional gear housing 59, 5| is appropriately recessed. centrally for passage of the shaft 55, with a sliding fit, so that the gear housing and its content may be shifted lenthwise the lathe bed 2 and along the shaft: 65 together with'the compound slide rest as a whole; Within the housing 5|), 5| is the main drivin gear 51, Fig. 8, also slidable on the shaft 65 but at all times having drivenconnection with it by means of a tenon'or key 66 fixed on .the gear hub but having a sliding fit inthe driveshaft keyway 61. Positioning faces 59, 59, Fig. 1, at the oppoerator.

site inner portions of the drive gear housingi50, 5| hold said gear 57 in the direction lengthwise the shaft 65, in the position along it as deter mined by the selected location of thecompound slide rest as a whole along the lathe bed. j.

This drive gear 51, preferably of the spiral type, has driving engagement with asmaller and also preferably spiral intermediate gear 69; :The I V latter is rotatably mounted one. short shaft-Bi fixed as by pins 62, 62' in an upright extension 58a (Figs. 1 and 8) of the upper housing member 50 already described, The intermediate gear .60 in turn meshes with a similar and preferably -'spi ral gear 99 keyed on the reduced outer end 48 of the pinion shaft 46 already describedyand at the other end of which the elongated drive pinion 45isfixed;- The gear housing extension 590., already re'- ferred to has a bearing aperture as at 49 for said end 48 of thepinion shaft 45, and the gear 99 is held on the latter between the shoulder of its reduced end 48 and an end bearing'boss 52 in said housing extension Sta. The latter may also provide opposed end bearing'formations 53,v 54 at the opposite faces of and thereby positioning the intermediate gear 60 on its short shaft 5|. To this point I have described, in detail the lower carriage upon which the entire mecha nism ofmy compound slide rest is mounted, together with the provisions for cperatively securing thislower carriage and hence the slide rest as a whole at any selected point lengthwise the lathe bed; also thedriving connections from the lower source, in this instance the back gearing at the headstock end of the lathe, up to the elongated drive pinion 39 disposed in th lower car riage l and from which pinion power is tran mitted for automatically actuating various parts of the compound slide rest, at the will of the op- I have also described, with particular reference to the lower right corner portion of Fig. 2 and to Figs. 16 and 17, the means (herein including the feed screw I3 and associated connections) for selective manual or power control and operation of the lower slide l9 whereby it and all parts on and above it are traversed length- Wise the lower carriage, in the right and left direction with reference to Figs. 2, 8 and 38; that is, crosswise of the lathe bed.

The invention further contemplates novel supporting and driving mechanism through which the top slideand carriage assembly maybe set to any angle about a vertical axis throughout a full 360 of arc, and also by which, again at theoption and under the selective control of the lathe operator, the top slide I98 may be caused to move along and'upon the top carriage 89, radially. of its vertical axis, in any angular position towhich they are adjusted relative to the lathe bed and to the lower carriage and slide unit.

Noting particularly Figs.'2 and 8,'the lower slide I8 has a vertically recessed portion 11 disposed intermediate its ends, herein nearer its front end. Said recess 11 extends vertically through the slide l8 and receives various of the operating parts now to be described. It is also seen in detail in severalof Figs. 32 to 3'7, noting particularly Figs. 34 and 37. Said parts received by it include the main pivotal and bearing element or pivot bearing disk 18 for the top carriage 89; see also Figs139 and 49.

This pivot and bearing-disk I8 is firmly fixed against the'underface of the top carriage 89 as by means of screw bolts I9 herein assisted by a central boss 89 at the top of the bearing disk and seating in a like recess in the top carriage underface. At its bottom face said pivot-bearing I8 is centrally bored as at 8| (Fig. 40) for rotative reception of the upright projection or post 82 on the traveler nut II already described in connection with the lower carriage The upper portion of said lower slide recessl'l is formed as a vertically disposed collar bearing for said'top carriage pivot disk 13.

The horizontal boss-like top end face 83 of said pivot-disk bearing, see Figs. 8, 3'7 and 2, provides an under bearing surface for a double ring gear 85, loose on but positioned by the pivot-bearing disk. I8 and held inplace vertically between said bearing face 83 and the underface of the top carriage 89.

This double ring gear 85 accordingly is securely positioned but is afforded capacit for rotation, relative both to the lower slide I8 and to the top carriage 89,'ab0ut the bearing disk I8 as its vertical axis. The lower annular gear portion or toothed ring element of'this double ring gear 85 meshes with and is driven by a relatively small bevel gear 86 integrally or otherwise unitarily connected to a spur gear 81, of about the same size as said bevel gear 86. This gearing unit 86-8'|, preferably formed of one solid piece of metal, is rotatably mounted on a stud shaft 92, see particularly Fig. 2, extending in the direction lengthwise the lower slide I8 and fixed in an appropriate recess therein as by a set screw 99.

As previously indicated, the invention includes means for rotatively adjusting the entire top carriage and slide unit 89-I98 relative to the under carriage and slide unit and hence relative to the lathe bed and to the work. And in combination with such rotative adjusting capacity, means is provided, herein through the medium of the described gear unit 89-8| and the associated ring gear 85, and adapted to be rendered operative or inoperative at the operators will, for connecting them with the power source and drive connections, herein through the elongated drive pinion 39 of the lower carriage I, thereby to afford a power drive for the top slide.

' Accordingly the lower slide I8 carries at a location laterally adjacent the gear unit 868'I and its stud shaft 92, an adjustably slidable shaft 93, seen at the lower right in Fig. 8 and in detail on a larger scale in Fig. 15; also in top plan and in association with the gearing unit 868'I in Fig. 32. At its inner end this sliding shaft 93 carries an intermediate gear 9| having a hub I99 pinned at I64 to said shaft. This gear 9| is at all times in mesh with the elongated drive pinion 39; see particularly Figs. 3, '7 and 9. Depending on the adjusted position of the sliding shaft 93, in the right and left direction in Figs. 8 and 15, said gear 9| will be aligned with and in meshing driving relation to the spur-gear portion 81 of the gear unit 868'I on shaft 92 (Figs. 2 and 32), or will be withdrawn from such driving relation.

Desirably automatic means is provided for releasably holding the slide shaft 93 in either of said adjusted positions. For this purpose I have here shown, as best seen in Fig. 15, a ball detent 96 loaded by a spring 91 housed in the lower slide I8 and there held in place as by a screw plug 98. The slide shaft 93 has a pair of spaced circumferential grooves 94, located to come opposite the ball detent 96 in the inoperative and operative positions of the gear 9| respectively. In either of said positions the ball detent 96 automatically snaps into holding relation in the appropriate groove 94 or 95, thereby preventing unintentional displacement of the slide shaft 93. The latter herein is equipped with a knurled head I92 as a convenient gripping device for pushing it in or withdrawing it, thereby to engage or disengage'the gear 9| in the manner described.

As shown in detail in Figs. 32 and 34, looking or clamping means is provided intermediate the lower slide I8 and the top carriage 89, for releasably setting or retaining the latter in any desired angular relation to the lower slide and car- 13*ia)ge, throughout the entire available swing of Such means herein comprises a lock stud or clamping pin I95 having an inner end formation conforming to the adjacent annular portion I96 (Fig. 40) of the pivot-disk I8, said portion I98 herein being a lower beveled flange at the base of said disk. This rotary locking member or set-' pin I95 has a threaded portion I94, Fig. 34, received in a like threaded side edge portion of the lower slide I8; see also Fig. 32. At its outer end is a manipulating handle I95 conveniently available to the operator. By turning this handle to screw in or'to back out the set-pin I95 the top carriage and all parts carried by it may be located in fixed angular relation to the underlying lower slide and carriage unit I9I, or quickly freed for further rotative movement.

To assist in thus setting or resetting the top carriage the latter desirably is provided with a graduated ring I 91 having an upwardly facing beveled outer face conveniently graduated in degrees and subdivisions. This graduated ring I9! is fixed to the underface of the carriage 89 as by a number of screws II9, four in'this instance, indicated in dotted outline in Fig. 1 and seen also in Figs. 39 and 41.

The top carriage 89, as already noted, carries the top slide I98 on which the tool-holder such as I981) of Fig. 38 is itself mounted, in one or the other or both slots. IBM. The guiding support for this top slide I98 on its top carriage 89 may be generally similar to that for the lower slide I8 on its carriage I, including the usual undercut beveled guide and way connections evident in the end views of Figs. 1, 3, 9, 19 and 21.

For slidably moving the top slide I98 on and relative to its carriage 89, the latter is provided with an elongated feed screw ||I receiving a like-threaded traveler or drive nut I36 having a top projection or post I31 fitted in a like apertureat the underface of the top slide 58 and there secured as by thescrew I38;'Fig. 2. These main parts of the feeding or traversing mechanism for the top slide, and their manner of mounting in the top carriage 80, also may be generally similar as for the corresponding feed screw I3 and traveler nut I1 of the lower carriage and slide. Thus the top-slide feede screw III extends the length of the top carriage 80 in a suitable recess 80a therein, Fig. 2, and projects at both ends of said topcarriag'e.

That end of the top carriage and slide at the right in Fig. 2 is herein referred to as-their front end. It is their end which is at the front of the lathe when the top carriage is in-its usual position crosswise the lathe bed and paralleling the lower carriage and slide, as in Figs. 1 to 3. Said position of the top carriage 88 represents the zero setting of its graduated dial IBL It will be understood however that in the course of the numerous available lathe operations the top carriage and slide unit 80-498 may be set at any desired angular relation to the lower carriage and slide unit I-IB, throughout the entire 360 circumference of the graduated ring I61. For example, in Fig. 38 the top carriage and slide unit 89488 are shown turned 96 from their Fig. 2 position, so that they parallel the lathe bed 2 and are at right angles to the lower carriage and slide unit II8, ,asappro priate for thread-cutting operations, among others. I

At its front end the feed screw III has hear-- ing support in a bushing I26 extending through a detachable front end plate I25 for the top carriage Gil, said plate being secured to the latter as by screws MB, four of which are shown in Figs- 18 and 19; see also Figs. 2, Band 21. For handoperation of this top-s1ide feed screw} I I, as seen in Figs. 2 and 38, itsv projecting front endfis equipped with a cranhorcross bar I21 having ,a handle I28. This hand-operating E27, i23 has a key connection at I29 with the feed screw Iii and is held in place thereon as by a washer I33 and retaining nut I34. At

its opposite or rear. end the feed screw III is journaled in a suitable bearing aperture I39 in the adjacent rear end wall of the top carriage 88. Movement of the feed screw IiI in the direction of its axis is prevented as by a collar- {32 pinned at I33 on the feed screw inwardly i oiits bearing I39, and by a washer I34 androtaining nut I35 threaded on its projecting rear end. 1

The top-slide power-drive connections, for driving the feed screw I I I, herein include a bevel pinion II2 loosely mounted on .said screw and having constant meshing relation with theupper toothed ring element of the .double ring gear 85 already described. Rotation of said ring gear 85, through the pinion and gear unit 85% and the slidable release gear. 9i meshing with the elongated main drive pinion 3 9, accordingly parts rotation'to said screw-carried pinion -I I2- and thence to the feed screw III itself, through an automatically operable clutch device to -be described. I t This feed-screw pinion II2 is held against inward movement along the feed screw as by acollar I I3 fixed by a set-screw -I I4. As seen in Fig. 2 and on a larger scale in Fig. 4, said ,feedescrew pinion I I2 has a forwardly extended hub, the front end of which is centrally bored to receive a further positioning collar I15, holding the pinion II 2 against axial displacement in the other direca tion, that is, outwardlL-toward the right .inFigs.

- positions.

-2'and 4. This latter collar H5 is fixed on the feed screw as .by a set-screw I I6, the top carria e desirably having an aperture II? in its top Wall vertically over said set-screw IIB for screwdriver access to it; see also Figs. 18 and 22. It is again particularly noted that the feed-screw pinion I 12, while held against endwisedisplacement upon the feed screw it I, is rotatively loose on the latter, so that; the pinion, as determined by the position of the associated clutch mechanism and automatic stop means to be described, may at times turn freely on and relatively to the feed screw. leaving the latter at rest, and at other times may be clutched to tne feed screw to driveit.

Again as seen inrFig. 2,..on anintermediate scale in and on a still larger scale in Figs. 4 to 6, such clutch mechanism herein comprises a projecting clutch element or lug I I8 at the front or outer face of the hub of the reed-screw pinion I I2.. This clutch element. I I8 is adapted for coOperation with. a similar. but oppositely projecting clutch element or lug H9 on a clutch yoke or spool I23 non-rotatively but slidably keyed on the lad- J'acent portion of the feed screw III as at I24. It will be understood that axial sliding movement of the yoke I23 toward-the left in FissrZ, 4: and 22.will cause this positive clutch device H8, M9

to be shifted from its inactive. or non=clutohed position shown in said fingers to an active or clutched position. Insaid clutched position, in which the elements IIB, I19 stand inthe Same plane transversely of the feed screw, rotation of the pinion H2 is positively transmitted to Said screw.

Such shifting this top slid feed-screw clu ch 7 herein is effected by a vertical pin 11 0 on a clutch shifting or trip lever I62 to be described, the lower end of said pin standing in a circumferfintial groove I22 in the clutch yoke I23. Vertically opposite this clutch yoke-the top carriage 30 is appropriately recessed as at I2I, Fi 4 (See also Figs. 18 and .39) to permit the described clutch, engaging or releasing movement of the pin I 20,

The clutch shifting or trip lever I62 carrying the yoke-engaging pin I20 is shown indeta-il in Figs. 18 to 24, being also seen in ecti n in Fig. ,2 and in end elevation in Fig. 3-8. Ref erring more particularly to said Figs. l8 to 24, the jront end portion of they top carriage .80, adjacent its end plate I25, has sunk in its top face, a small pivotpositioning plate .Idl for the trip ,leyer I62, said p t being z m v b yheld on the top ca r a e as by a screw I44; Figs. 18, 1-9 and particularly 'Fig. 39. The trip lever I62 extends substantially across the top carriage 8-0, with one end near or overlying thev plate I H (depending on the lever-pivot setting) and its other end projection yolt e shift-pin IEGis-fiXed-in the trip lever.IB2- somewhat nearer to one end, that adjacent the anchor plate It, thanto the other. v:The two pivot positions .areat opposite sides of said yokes pin I26, in the .directionlengthwise the tripzlever 'I 62, the latter having the alternative .pivotescrew receiving apertures 1.52 and I46 defining said From the foregoing-it will. be understood that the trip lever .1 e2 terms a part of the automatic stop motiomior predeterminedly throwing out the top-slide feed-screw clutch and so to halt the traversing movement of the top slide I88, under power actuation of the latter. For some operations, such as cutting right-hand threads, the movement of the top slide is in a given direction, as from right to left in Figs. 18, 20 and 38 (the latter a view from the rear of the lathe). At other times, as for left-hand thread cutting, the top slide movement is the opposite, as from left to right in said figures. But since the clutchreleasing movement of the clutch yoke I23 is always in the same direction, namely, from left to right in the figures under consideration, the selective pivot position for the trip lever I62 is herein providedso that swinging of this trip lever in either direction, corresponding to the direction of top-slide movement, will communicate the same herein left-to-right clutch-throwout movement to the yoke-pin I20 and clutch yoke I23.

Accordingly the central pivot-screw aperture I46 in the trip lever I62 is utilized for automatic stop control. under right-to-left operations of the top slide. The setting is then as in Figs. 18, 19 and particularly Fig. 23. The removable pivot screw I45 is here positioned in said lever aperture I46 and turned down into an anchoring aperture I41 tapped vertically into the upper face of the top carriage 80 at the appropriate location for the purpose. For automatic stop control under conditionsof opposite movement of the top slide, from left to right in Figs. 18 and 20, the same pivot screw I45 is removed from pivot-aperture I46 of the trip lever and installed in the end aperture I42, being turned down into a tapped aperture I43 provided for this purpose in the removable plate I4 I Such pivot setting is represented in Fig 24.

The trip lever I62 cooperates with variably positionable stop devices on and moving with the top slide I08, as will be described. The projecting end of said trip lever, that at the lower portion of Figs. '18, 23 and 24, will be referred to as the stop-actuated end. Bycomparing Figs. 23v

and 24 it will be noted that in Fig. 23 the lever pivot screw I45 is fixed at a position between said stop-actuated end and the clutch-yoke pin I20. Movement of said projecting stop-actuated end of the trip lever from right to left (Fig. 23) accorde ingly moves the clutch-yoke pin I20 in the desired clutch-throwout direction, from left to right. In Fig. 24 however the lever pivot screw I45 is disposed at the opposite side of said yoke pin, remote from the stop-actuated end of the trip lever, the yoke-pin now standing between the lever pivot and said stop-actuatedlever end. Consequently under this Fig. 24 setting, movement of thisstope actuated end of the lever in the direction from left to right (opposite to its movement in Fig. 23) still eifects a left-to-right movement of the clutch-yoke pin I20, in the desired clutch-throwout direction g v The variably positionable top-slide-actuated stop devices above mentioned will now readily be understood with little further detailed description. Referring still to Figs. 18 to 24, also Fig. 38, the top slide I08 is provided with a threaded stop bar I48, itself adjustably positionable on and along the top slide and adjustably carrying a stop device or stop proper comprising a pair of knurled nuts I50, I50. Depending on the direction of top slide travel, whether from right to left or vice versa, either the left or the right nut I50 of this stop pair respectively will act as the lever-conillustratin theirstructure.

.ta'cting stop or abutment, the other nut I50 serving as a lock.

' The stop bar I48 is adjustably mounted at a longitudinal side face of the top slide I08 in a bearing bracket I5l secured to the slide by screws I52. It has a sliding fit in this bracket I5I so as to be bodily adjustable lengthwise relative to the top slide. For fixing this stop bar I48 in adjusted position the bracket has a set screw I53; also a pair of knurled lock nuts I54, I55, are threaded on the stop bar and adapted to be turned up against the opposite sides of the bearing bracket I5I. To facilitate the description the two opposite ends of the stop bar I48, at the left and at the right respectively in Figs. 18 to 24, are identified by the numerals I51 and I63. It will also be noted that what has been referred to as the projecting or stop-actuated end of the clutch trip lever I62 is in the form of a collar or sleeve having a transverse passage I49 for this stop bar I48, with adequate clearance to permit the angular movement of the trip lever I62 relative to the stop bar as evident in Figs. 23 and 24.

In Figs. 13 and 20 the trip lever I62 is shown in a neutral position, with the stop nut pair I50 located near it and adjacent the right end I63 of the stop bar I48. This positioning of the parts is merely arbitrary, being selected as convenient for It could be assumed, however, in comparing Fig. 18 with Fig. 23, that in Fig. 18 the top slide I88 occupies a position half way between that corresponding to the fullline clutch-engaged position of the lever I62 in Fig. 23 and that corresponding to the dotted-line clutch-released lever position of that figure. It will now be apparent that in setting up or adjusting the compound slide rest for powerdriven actuation of its top slide I08 and under the automatic control of the described stop mechanism it is a simple matter to eflect a changeover from right-hand operations as in Figs. 18, 20, and 23, involving travel of top slide from right to left therein, to left-hand operations and top slide travel from left to right as assumed in Fig. 24. In this connection it will be understood that the change gearing previously referred to in connection with the back gearing I6 of Fig. 38 is so regulated that the main drive shaft 65 through which the power is transmitted to the entire compound slide rest, is rotated in one or the opposite direction as appropriate to the particular operation.

In addition to such shift of the change gearing between the main drive shaft 65 and the power source, whatever the latter may be in any given lathe installation, such changeover from right-hand to left-hand top-slide operation under automatic stop control, that is, from an operation as in Figs. 18, 20, 23 to that of Fig. 24, it is merely necessary to remove the trip-lever pivot-screw I45 from its Fig. 23 location in the intermediate lever-pivot aperture I46, and to relocate it in the end pivot-aperture I42 and turn it down into threaded'aperture I43 provided for the purposein the plate I4I. Also, the stop nut pair I50 is adjusted inwardly along the stop'bar I48, from the right end I63 of the latter towardan intermediate location, such as that which they occupy in Fig. 24. 7

To accomplish this, said pair of stop nuts I50, I50 is backed completely off to the right end I63 of the stop bar, and the latter is pulled out to the left clear' 'of the trip lever I62. At such time the right look nut I55 adjacent the bearing bracket I5I-is backed over to the right to the le'qlfir'd elfl'ieht. The 160k hilt pair I50 is "then replaced on the stop bar and turned along on it to the appropriate intermediate location, which may be closely adjacent to said'l'ock nut I 55. The stop bar ['48 is then reinserted through its aperture 9 in the trip lever 62 and again firmly secured by turning down the set screw l5 3, previously released to make the described adjustment, and by turning up both lock nuts I54 and I'Sdtightly against the respective side faces of the bearing bracket 151. This provides a stop setting as typified in Fig. 24. It will be obvious that in such change from a right-hand to a left hand operation of the top slide I08, or vice 'vers'a, the slide itself will be appropriately shifted'along its top carriage '80, as from a position nearer the left end thereof for a leftto- 'right operation, to a location nearer the right end of the carriage, for a right-to-left' operation. This positioning of the top slidemay be effected manually by the handle i 28. Where the particular job requires a comparatively long travel for the top slide it also will be appreciated that the stop bar I48 may be itself bodily shifted lengthwise the top slide to any necessary extent within the capacity of the mechanism. For example, in -a set up for a rather extreme top slide travel from left to right, the major length of the stop bar 148 may lie to the right of the top slide, with the left stop-bar end [51 at or near the left lock nut I54.

Under the described power-driving and automatic stopping of the top slide, its movement continues until the predeterminedly set stop-nut pair I50 contacts and swings the clutch trip lever I62 to disengage the clutch elements H8, H9 and hence to release the feed-screw pinion H2 from the feed screw, whereupon rotation of the latter halts, bringing the top slide to rest. From the previous comparison of Figs. 23 and 24 it will be understood :that such throwout of the clutch device 1 8, H9 is accomplished irrespective of whether the pair of stopnuts I50 comes into abutment with the right side of the trip lever I62 and hence to swing it to the left as in Fig. 23, or similarly engages the left side of the trip lever to swing it to the right as in Fig. 24. Due to the different location of the trip-lever pivot M5 for said different directions of top-slide travel, the releasing action at the clutch device H8, H9 is the same.

The universal adaptability of my compound slide rest to substantially any standard lathe, and the wide range of operations available, selectively under manual or power actuation, will now be apparent from the foregoing description and reference to the drawings.

To mention but a few typical operations, assume now that the job is to cut or grind a radial face, as for example infacing off a casting secured to the lathe face .plate. If this is to be done manually the power source is disconnected from the main drive shaft 55 as by appropriate adjustment or removal of the change gearing herein associated with the back gearing 16. The top carriage is set angularly in the zero position of its dial I01 ,with'both top and bottom carriage-'and-slide units parallel and crosswise the lathe 'bed as in Fig. 2. The top carriage is clamped in this position, by turning up the screw clamp Illa-105. The entire compound slide rest is bodily shifted along the lathe bed to bring the tool on the top slide appropriately adjacent the "work, the rest a'sa whole being freed for movement to andbei'ng secured in said position along thelathe by manipulation of the bed nut 4 and clamping handle 5.

With the lathe then started up to rotate the work, turning of thevlower carriage feed-screw handle I9, herein in the clockwise direction as viewed from the right in Fig. 2 or as looking at the end view of Fig. 3, will traverse the lower carriage I8 together with all parts on and above it, including the appropriate grinding or cutting to'ol, in the direction across'the lathe bed and across the rotating work;

To perform the samepperati'on under power actuation the comp'ou'ndislide rest assembly as a whole is similarly set at the appropriate position lengthwise the lathe bed, and the change gearing is adjusted to apply power to the main drive shaft ea, herein from the "back gearing T6, and so as to turn the lower carriage feed-screw 13 in the same direction as above done manually, that is, clockwise in Fig. 3.

In setting up for this power operation, the several clutch devices initiallyare released. 'These include the lower expanding-clutch pinion 2-1 on the lower feed screw '13 as controlled by the knurled knob 36 adjacent the handle t9 of :said screw, the dduble ring gear clutch or release device 1'36, is? controlled by pulling out or .pushing in the knob "[532, and the automatic stopcontrol clutch "Ht, H9 of the top feed-screw piion H2. With these clutch devices released the lathe is star-ted up. The lower feed-screwelutch, associated with the pinion 21, .is then engaged, by turning in the knurled operating knob 36 and setting up its look nut 35. Thereup'on the lower carriage and all parts on and above it will traverse across the lathe bed automatically under power as herein derived from the lathe back gearing [3, rather than under the manual actuation of the handcrank l9.

Under such automatic drive the power trans mission, starting with the main drive shaft 65 or its end gear associated with the back gearing 76, is from this drive shaft, through the spiral gearing 5?, Ell, 99 onto the shaft E6 of the elongated drive pinion '39, and from the latter to the clutch pinion 2-! then clutched to the feed screw l3 by the setting of the pinion-clutch control 38 in the manner described.

For operations such as cutting threads, the cutting tool is to be traversed lengthwise the lathe bed, along and parallel to the axis cf the rotating work such as ashaft, rodor the like. For such job, the top carriage 89' of my compound slide rest is turnedto a position such :as

represented in Fig. 38, at right angles to the under carriage and paralleling the lathe bed 2.

Because of the human factor it is desirable to perform such operations as thread cutting solely under the power control of the lathe itself, "but it will be understood that the power-actuated operation now under consideration may, if desired, be effected manually by turning the top feed-screw by hand, the power connections being released.

Referring again to Fig. '38, assume that the change gearing adjacent the back gearing lli is set to drive the shaft $5 in the desired direction. The top carriage is set to the 90" angular relation of Fig. 38and there locked by turning up the clamp Hl3lll5. The several clutch devices are initially released and the automatic stop mechanism associated with the stop shaft M 5 is appropriately set, as typified :in Figs. :28 and 24 in connection with cutting "a right-hand or a left-hand threa'd respectively. For this typical screw-cutting operation the lower .feed screw clutch controlled by the knurled knob 36 remains released throughout, being locked in such position by its lock nut 35, so that the clutch pinion 2| merely turns idly on the lower feed screw I3. o

With the lathe turning, the double-ring-gear clutch device is caused to engage, by slowly pushing in the knurled knob I02 and hence engaging the pinion 81 of unit 80-81 with the intermediate pinion 9| meshing with and driven by the elongated drive pinion 39. It will be understood that in setting the automatic stop mechanism the top feed-screw clutch lever I62 was shifted into its clutch engaging position, making the pinion H2 fast with respect to the top feed screw III. Hence, upon so positioning the knurled'knob I02, power isapplied to said top feed screw III and the top slide I08 is caused to travel along the top carriage 80, until stopped by the automatic tripping of the clutch lever I62. It is also an important feature that this top feedscrew clutch-lever I62 may likewise be shifted manually, at any desired time, to disengage the top feed-screw clutch'elements I I8, I I9 and hence to stop movement of the top slide at will.

Under such power-driven operation of the top slide, either under automatic or manual stop control, the line of power transmission again is from the power source whether the back gearing as herein illustrated or otherwise, onto the main drive shaft 65 and through the spiral gearing as before, to the elongated drive pinion 39 which drives the intermediate gear 9!, now in mesh with the spur gear 81 integral with the bevel gear 86. The latter drives the double-ring-gear 85, through its lower toothed ring member, while its upper toothed ring element in turn drives the bevel pinion II2, now clutched to the top feed screw III through the engaged clutch elements H8, H9. Thus the top feed-screw nut I36 is caused to travel lengthwise its feed screw III of the top carriage, moving the top slide I08 with it. until the predeterminedly set stop-nut pair I50 contacts and trips the clutch lever I62, or until the latter is manually thrown, as the operator may desire.

It is here again particularly emphasized that the top carriage and its slide, as a unit, may be set at any desired angle relative to the lower carriage and slide unit, throughout the ventire 360 of arc about the pivot bearing of the top carriage. The particular 90 setting shown by way of example in Fig. 38 is but one of the full 360 range of angular settings available. Thus for example a taper of any prescribed degree may be cut or ground by setting the top unit to the appropriate angle, anywhere within the full 360 swing, and as readily ascertained by reference to the graduated dial on the top carriage. And in whatever angular position the top carriage is set for a particular job, its top slide is equally capable of power actuation and of automatic stop control, in either direction of travel, and likewise in any such angular setting over the full 360 range it is available also for manual operation and control at the operators will.

Heretofore so far as I am aware, no similarly coordinated compound slide rest has been provided, applicable uniformly to the generality of standard or preferred lathes and having integrally built into and permanently associated with it driving and control mechanism whereby driving power may be applied from any available source, such as the back gearing of the lathe, either to ment or unit at rest, or to render them available forfmanual operation, at the option and under the control of the operator. These and other results and advantages which will now be apparent from the disclosure herein are accomplished with a marked simplicity and compactness of mechanism andat relatively small cost in consideration of the wide increase in range of usefulness and greater speed of operation hereby made possible for existing and future lathes.

My invention is not limited to the particular embodiment thereof illustrated and described herein, and I set forth its scope in my following claims. a

1. A compound slide rest adapted for detachable association with standard and other lathes, comprising, in combination, a lower carriage variably positionable along a lathe bed, adjustable means for securing said carriage and the restas a whole in selected position on the given bed, said means including spaced depending members on said carriage relatively variably positionable crosswise of a lathe bed for clamping engagement with opposite side portions of such beds of different widths, a lower slide traversable lengthwise on the lower carriage, traversing mechanism for the lower slide, manual means for actuating said traversing mechanism, power-drive connections also for actuating said traversing mechanism and including means available during normal use of the slide rest for. rendering said connections operative or inoperative at will, said means readily available to the operator at, all times irrespective of the operating status of the lathe and slide rest as a whole, an upper assembly mounted on the lower slide for full rot'ative adjustment relative thereto about a vertical pivot and comprising a topcarriage and a top slide movable on the latter, and selectively manual and power operative mechanism for traversing the top slide on its carriage radially ofothe vertical pivot thereof and many and .all positions of rotative adjustment of said upper assembly.

2. A compound slide rest attachment for lathes, comprising, in combination, a lower carriage adapted for fixing upon a lathe bed in variable position along it, means for. securing said carriage both vertically and horizontally on and in relation to the given bed, said means including spaced depending members on said carriage relatively variably positionable crosswise of a lathe bed for clamping engagement with opposite side portions of such beds of different widths, a power-transmitting shaft mounted on and extending lengthwise the lathe bed, said power shaft having means near one end for connecting it with an available power source at the lathe and so as to be driven in one or the opposite directions selectively, a main drive pinion for the slide rest journaled in said lower carriage, gearing connections between said main drive pinion and the power shaft, said gearing connections carried by the lower carriage and being shiftable along the lathe bed with the lower carriage and relative to the power shaft. 8.

lower slide movable on the lower carriage, a manually operable feed screw rotatable in the lower carriage and having a traveler nut secured to the lowerslide, gearing intermediate the main drive pinion and said lower carriage feedscrew for optional power drive of the latter thereby to move'the lower slide,- and clutchmechanism including control means therefor to render said lastnamed gearing operative or inoperative at will.

3. A compound slide rest attachment for lathes, comprising, in combination, a lower carriage adapted for fixing upon a lathe bed in variable position along it, a power-transmitting .shaft mounted on and extending lengthwise the lathe bed, said power shaft having means near one end for connecting it withan available power'source at th lathe and so as to be driven in one c-r'the opposite direction selectively, a'main drive pinion for the slide rest journaledin said lower carriage, gearing connections between said main drive pinion and the power shaft, said gearing connections carried by the lower carriage I and being shiftable along the lathe bed with 'thelower carriage and relative to the power shaft, a lower slide movable on the lower carriage, a manually operable feed screw rotatable in the lower carriage and having a travelernut secured to the lower slide, clutch-controlled gearing intermediatethe main drive pinion and said lower carriage feed screw for optional power drive-of the latter thereby'to move the lower slide, an upper unit including a carriage and a slide movable thereon, said upper unit supported on the lower slide for angular adjustment relative to it about a vertical axis and universally through a full 360 of arc, feed screw and traveler nut connections on the upper unit for moving the upper slide on the upper carriage radially of said vertical axis and in any angular position of said upper unit, and selective manual and power means for so moving the upper slide on its carriage irrespective of their angular position relative to the lower slide.

4. A compound slide rest attachment forlathes, comprising, in combination, a lower carriage adapted for fixing upon a lathe bed in variable position along it, a power-transmitting shaft mounted on and extending lengthwise the lathe bed, said power shaft having means near one end for connecting it with an available power source at the lathe and so as to be driven in one or the pposite direction selectively, a main drive pinion for the slide rest journaled in said lower carriage, gearing connections between said main drive pinion and the power shaft, said gearing connections carried by the lower carriage and being shiftable along the lathe bed with the lower carriage and r lative to the power shaft, a lower slide movable on the lower carriage, a manually operable feed screw rotatable in the lower carriage and having a traveler nut secured to the lower slide, clutch-controlled gearing intermediate the main drive pinion and said lower carriage feedscrew for optional power drive of the latter thereny to move the lower slide, an upper unit including a carr age and a slide movable thereon, said upper unit supported on the lower slide for anular adjustment relative to it about a vertical ax s and universally through a full 360 of arc, feed screw and traveler nut connections on the upper unit for moving the upper slide on the upper carriage radially of sa d vertical axis and in any angular position of said upper unit, a ring gear element mounted concentrically of the upper unit axis and rotatable relative to both the upper unit and the lower slide, gearing connections between the main drive pinion in the lower carriage and said ring gear element including means to render said connections operative or inoperative at will, and i clutch-controlled gearing connections betweensaid ring gear element and the'feed screw of theyupper unit for selectively moving the tops slide'on its carriage by power from said power shaft, r

5. In a compound slide rest attachment for a lathe; in combination, a lower carriage having a slide movable'on it, an upper carriage also having a slide movable thereon, a vertical pivot disk fixed at the under face of the upper carriage and having rotative bearing support in and upon the slide of the lower carriage, a double ring gear positioned by said pivot disk for rotation relative to it, means to move the lower slide on its carriage,

means on the upper carriage for moving its slide thereon, a main power-operable drive element on the lower-carriage and clutch-controllable gearing connections respectively between said drive element and the double ring gear and between the latter and the means for moving the upper slide.

comprising, in combination, a lower carriage adapted for fixing upon a lathe bedin variable position along it, a power-transmitting shaft mountedion and extending lengthwise the lathe bed, said power shaft having'means near one end for connecting it with an available power source at the lathe and so as to be driven in one or thebpposite direction selectively, a main drive pinion for the slide rest journaledin said lower carriage, gearing connections between said main drive pinion and the power shaft, said gearing connections carried by the lower carriage and being shiftable along the lathe bed with the lower carriage and relative to the power shaft, a lower slide movable on the lower carriage, a manually operable feed screw-rotatable in the lower carriage and having'a traveler nutsecured to the lower slide, clutch-controlled gearing intermediate the main drive pinion and said lower carriage feed screw for opt onal power drive of the latter thereby to move the lower slide, an upper unit including a carriage and a slide movable thereon, said upper unit supported on the lower slide for angular adjustment relative to it about a vertical axis and universally through a full 360 of arc, feed screw and traveler nut connections on the upper unit for mov ng the upper slide on the upper carriage radially of said vertical axis and in any angular position of said upper unit, selective manual and power means for so moving the upper slide on its carriage irrespective of their angular position relative to the lower slide, and variably positionable automatic stop means for predeterminedly halting the top slide at the desired point and for either direction of movement thereof.

'7. A compound slide rest attachment for lathes, comprising. in combination, a lower carriage adapted for fixing upon a, lathe bed in variable position along it, a power-transmitting shaft mounted on and extending lengthwise the lathe bed, said power shaft having means near one end for connecting it with an ava lable power source at the lathe and so as to be driven in on or the opposite direction selectively, a main drive pinion for the slide rest journaled in said lower carriage, gearing connections between said main drive pinion and the power shaft, said gearing connections carried by the lower carriage and being shiftable along the lathe bed with the lower carriage and relative to the power shaft, a lower slide 6. A compound slide rest attachment for lathes,

movable on the lowerearriage, a manually operable feed screw rotatable in the lower cartlageand having a traveler nut secured. to the lower slide, clutch eontrolled gearing intermediate the main drive pinion and said lcwer carriage teed screw -for optional power drive of the latter thereby to position of said upper unit, a ring gear element mounted concentrically of the upper unit axis and rotatable relative to both the upper unit and the lower slide, gearing connections'between the main drive pin-ion inthe lower carriag and said. ring gear element including means to rendersaidconnections operative or inoperative at will, clutc'h-' controlled gearing connections b'etweensaid ring gear element and the feed screw ofthe upper unit for selectively moving the top slide on its carriage by power from said power-shaft, and variably p0- sitionable automatic stop means for predeterr'niiie'dly halting the top slide at the desired point and for either direction of movement thereof.

8. A compound slide rest attachment forlathe's, comprising, combination, a lower carriage, releasable securing means] for fixing said carriage on a lathe bed in variable position along it, said means including spaced depending members on said carriage relatively variably positionable crosswise-of a lathe bed for clamping engagement with opposite side portions of such beds of different clutch-controlled gearing between the initial I driven-element and the lower slide for so moving widths, a drive shaft on and extending lengththe latter, an upper unit including a carriage and a slide movable thereon, said upper unit supported on the lower slide for angular adjustment relative to about a vertical axis and universally through -a mll 360 ot arc, and clutch means and operating connections between the upper slide and the initial driven element, whereby the upper slide may be traversed radially of the upper carriage axis in any angular relation thereto, independently of the lower slide. 7

9, Acompound slide rest attachment for lathes, com-prising; in combination, a lower carriage,

clamping means for securing said carriage on a lathe bed in variable position along it, said means including spaced depending'members on said carriage relatively variably positionable crosswise of a lathe bed for clamping engagement with opposite side portions of such beds of different widths, a drive shaft on and extending lengthwise the lathe bed, an initial driven element on the slide rest, gearing connecting said driven ele-' ment and the drive shaft in any position of the slide rest along the lathe bed, a lower slide movable on the lower carriage crosswise the lathe bed, clutch-controlled gearing between the initial driven element and the lower slide'for 30 moving the latter, an upper unit including a carriage and a slide movable thereon, said upper unit supported on the lower slidefor angularadjustment relative to it about a vertical axis and universally through a full 360 of arc, and clutch means and operating connections between the upper slide and'the initial driven element, together with manual operating means associated with said connections, whereby the upper slide may be traversed radially of the upper carriage axis manually or automatically, andelther with the lower slide at rest or simultaneously with movement of the latter.

ERNEST R. IORELLI.

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