US1408997A - Lathe - Google Patents

Description

N. F. FRETTER.

LATHE.

APPLICATION FILED APR. 22 1911;.

1,40 ,997, Patented Mar. 7, 1922.

l 4 sums sm-zu I. 2% 160 N. F. FRETTER.

LATHE.

APPLICATlON FILED APR. 22; 1918.

Patented Mar 7, 1922.

4 SHEETS-SHEET 2.

N F. FRETTER.

LATHE.

APPLICATION FILED APR. 22 IBIS.

1 408 997; Patented Mar. 7, 1922.

. t 4 SHEETS-SHEET 3- 8 161 .9691 90 7 61, 69:?40 w :0 g o N. F. FRETTER.

LATHE.

APPLICATION FILED APR. 22, 1918.

Patented Mar. 7, 1922.

r 2 w w ,5 w a m m M I 7 111/ r/l J U 7 UNITED? STATES PATENT OFFICE.

NATHAN F. FRETTER, OF CLEVELAND, OHIO.

LATHE.

Original application filed August 18, 1917, Seria1 No. 186,859.

Specification of Letters Patent.

22, 1918. Serial No. 229,896.

To all to 710m it'mag concern Be it'known that I, NATHANLF."Fnnrrnn,

a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Lathes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to improvements in lathes of the class disclosed in my former application, Serial No. 186,859, filed August 18, 1917, and whereof this application is a division.

As in the former case, the present machine is designed to finish what are known as yoke ends, although the invention is applicable to machines for finishing various other kinds of articles, as will readily be seen from the following discussion.

The main object of my present invention is to simplify and accordingly cheapen the construction of the embodimentwhich constitutes the subject matter-of my former application above referred to; and in general, it may be defined as consisting of the/combinations of elements set forth in the claims annexed hereto and illustrated in the drawings accompanying and forming a part hereof and wherein Fig. 1 is a plan view of a turret lathe constructed in accordance with my present invention; Fig. 2 is a vertical transverse section on line 2 2 ofF 1, looking in the direction of the arrows; Fig. 3 is a horizontal section on the line 3-3 of Fig. 9., looking down; Fig. 41 is a section substantially on the lines 1 lof Figs. 1 and 3; Figs. 5, 6, and '7 are details of one of the chucks or. workholders, the last mentioned being a section on line 77 of Fig. 5: Fig. 8 is a sectional detail on line 88 of Fig. 3; Fig. 9'is a perspective View of a yoke end, the article my present machine is designed to finish; Figs. 10, 1.1 and 12 represent, successively, the various operations in the order in which they are performed on the yoke end by my machine; and Fig. 13 is a sectional detail on the line 13-13 of Fig. 1.

The housing 1 of the machine is generally cylindrical in form and has a base flango 2. At its upper end it has an upwardly opening channel 3 within the bottomot which and at suitable distances thercabout are supported rollers etupon pins 5 which have their ends supported within the opposite side walls of the channel. The top of the housing. is open inside the channel, and shown as formed integral with the outer wall of the channel is a trough 6 which has communication, through a tube 7 with a drain basin 8, the latter being illustrated as formed integral with the rear side of the machine. lVhile I have said that the housing is generally cylindrical, in form, it is made straight at its rear side below its top to adapt it to mechanism located in that vicinity, and presently to be introduced.

The turret 10, which is in the form of a ring, is supported within the channel 3 upon the rollers 4 so as to rotate freely. The lower outer face of the turret is provided with gear teeth 11 which extend continuously throughout its circumference, the teeth being entirely concealed by the outer wall of the channel 8. 90 apart about the turret, its upper surface is radially grooved v at 1 1- to receive in the sidesof each groove, plates 15, and the opposed edges of these plates are formed to produce between them a dove-tail guideway within which is slidably retained the lower portion of a chuck or workholder 16.

In Figs. 5, 6 and 7, where the chucks or workholders 16 are shown in detail, it will be observed that the same is made up of an upper block 18 and a lower block 19, which are hinged together on pins 20, a pin being located on each side of the vertical center and spaced therefrom to leave the central portion of the chuck unobstructed, the lower block having a dovetail extension 21 for guidance within the dovetail groove ahovedescribed. A roller 22 is set within therear of the block 19, and a roller in the front face thereof. A cavity "25 is formed in the front of the blocks 18 and 19 and is divided substantially equally between the two, the cavity opening "through the rear of the blocks between their hinged connections. A hardened jaw 27 is clamped within each block by screws 26, and each jaw has a recess 28. These recesses are adapted to receive the shank y of a yoke Y so that the bosses y/ of the yoke project beyond the front of the chuck, while the end of the shank is exposed through the opening in the rear of the chuck. A fork 3O fits down V trated in Fig. 11.

over the block 18 and has its side branches pivotally connected thereto by means of the screws 31, the branches extending down over the sides of the block 19 to receive within their notches 32 the anti-friction rollers 23, carried upon screws 34 which pro ject from the sides of the block.

The notches 32 are of such shape as to produce a camming action as their lower sides engage and ride beneath the rollers'33 ator when he wishes to open or close the.

chuck.

.In Fig. 11 have'designated, by the letter A, the. station at which the, articles to be finished are inserted into and removed from the chucks. ently to be described the turret is rotated intermittently tl'u'ough 909, always in one direction. .At the station designated B, in Fig. 1, the first step of the operation is performed. to wit, the drilling of the shank y of the yoke, such step being illustrated in Fig. 10. At C the circular faces ,Of the bosses :y' are finished, such constituting the second step in the finished operation, as illus- At D, the bore of the shank is tapped or threaded and the bosses are drilled as indicated in Fig. 12, which represents the third and final step of the finishing operation. Each chuck arrives at station B at the outer edge of the turret 10 and remains in. such. a position during the performance of the first step of the operation. As the chuck advances toward the station (l, the roller 23 in the front face of the block 19 engages the edge of a cam 5 0 which shifts the chuck inward. The cam is secured by screws 41 to the side of the channel 3 and projects upward and over the turret, the depth of the cam being sufficient to move the chuck to the inner side of the turret ring. During the cutting operation. which is performed at station C, the chuck is advanced toward the outer edge of the turret by mechanism which will presently be described and into operative relation to the cutters, the movement being sufficient to project the bosses completely past the edges of the cutters. Any further outward movement of the chuck necessary to bring it to the extreme outer edge of the turret is ac complished by the cam 43 which is secured to the inner Wall of the channel 3 and rises upward and overhangs the rear side of the turret, the edge of the cam. being arranged to engage the roller 22 in the rear of the block 1.). The chuck isheld in this position by cam 43, during the operations performed to the inner side of the channel 3.

By means of mechanism pres- "shaft extends transversely of the housing meshes with a gear 61 that is fixed to the shaft 55. The shaft 55has also secured to it a worm 62 which meshes with a worm wheel 63 keyed to' a central vertical shaft 64:. This shaft is journaled within a boss 65 of a casing 66. enclosing the worm wheel,

and in a bearing 67 that is shown as made a part of a brace 68 whichebridges the upper end of the housing and has its ends secured A earn 1 and is supportechby suitable bearings 72 and 73, directly beneath the lower end of the vertical shaft or and is driven therefrom through the mitre gears 74 and 75 which are carried, respectively, by the shafts (it and 70. The casing 66, above referred to, is supported and spaced from the sides of the housing by arms 76.

The turret 10 is driven by a pinion 8O keyed to the upper end of the shaft 81 supported within brackets 82 extending rearwardly from the housing 1. The shaft 81 has a bevel gear 85 secured to its lower end, and this gear meshes with asimilar pinion 86 that is fastened to the right hand end (as viewed from the front of the machine) of a sleeve 87, mounted on a shaft 88, supported in a horizontal position by brackets 89,- carried b the rear of the 'housingrl. The end of the sleeve 87 opposite the pinion 86 has fastened to it a clutch member 90 for 91, and its opposite end isprovided with a roller 97 which traverses the groove 98 of the cam 9.2. The groove of the cam is so shaped as to engage the clutch member 91 with the member 90, and thus move the turret; twice upon each rotation of the cam, and also to permit a dwell of the turret intermediate its movements of sufficient duration to allow for the operation of the tools. The

shaft 88 receives its power from the main driving shaft 51 through a gear 100, secured to its left hand end, and meshing with the gear 0 on the shaft 51,

Thi s I have already explained how the turret is intermittently moved (each movement extending through 90), and it may be tem the channel 3,,the plunger having a socket at its lower end which receives the upper end of a rod 107 that is guided within a bracket 108 secured to the side of the housing. A yielding connection is provided between the plunger and rod 107 by a spring 110 that is confined between the lower end of the plunger and a nut 111 adjustable along the rod, the separation of the rod and plunger being limited by a pin 112 which.

extends through a slot in the lower end of the plunger. The rod is held against rotation within the bracket 108 by a set screw 113 that is threaded through the wall of the bracket 108 and enters a longitudinal groove in the rod. This is for the purpose of maintaining a roller 115 carried by the lower end of the rod in proper relation to a cam 1.16 which is fastened to the shaft 70. It may be explained that as the turret approaches its period of rest, the care 116 'ele Vates the plunger into contact with the bot tom of the turret so that when one recess 118 of a series wherewith the bottom of the turret is provided is brought into register with the plunger, the plunger is projected into the recess by the spring 110.

I shall now describe the mechanisms that are located at the respective stations B, O and D. Rising from the inner side of the channel 3, at station E, is a bracket 120 that has a horizontal boss 121 at its upper end within which is journaled a-spindle 122, the boss being divided near its middle for the accommodation of a sprocket wheel 123 that is splined to the spindle. Atits forward end the spindle is provided with a tool chuck .124, which may be of any approved type, and within which is clamped the shank of a drill 125. The sprocket 123 is driven, through a chain 127, from a sprocket wheel on the main shaft 51.

Aplate 133, having an aperture at its cen ter which is adapted to be placed over the drill 125 so that the plate may engage the (illllCiC 124, has flexible members 135, such as 7 light weight cables, attached to its ends, the

flexible members or cables extending rearwardly over sheaves 136 that are supported upon opposite sides of the rear portion of the boss 121, and having a weight 137 attached to their lower ends which tends to draw the spindle inwardly. The rear end of the spindle contains a ball, or other anti-friction device 138 which is adapted to engage the depending end of a slide 140 (see Fig. 2) that is mount ed for reciprocation within a guideway in the upper side of the boss 121. The slide,

in turn, is provided at its inner end with a roller 141 arranged to ride the periphery of a cam 142 that is secured to the upper end of the Vertical shaft 64, the cam being shown as one of a stack of three resting upon a flange 143 of the shaft and held thereagainst by anut 144 that is threaded upon the reduced end of the shaft. As the cam is 1'0 tated to the right, as viewed in Fig. 1, it will, through the intervention of the slide, advance the spindle and consequently the drill 125 forwardly to bore the shank of a yoke Y that is carried by a chuck then located in front of the drill.

A bracket 148 rises from the inner wall of the channel 3 at a station C and has a boss 149 at its upper end within which a plunger 150 is reciproc-able, the rear end of the plunger being provided with an anti-friction member 151 which is adapted to be engaged by the depending end of a slide 152 that is reciprocable within a guideway 153 in the upper side of the boss 149 (see Fig. 4). This slide has an anti-friction roller 154 that bears against the periphery of the upper cam 155 of the aforesaid stack, the cam surface being so inclined as to move the slide and plunger outward as the cam rotates toward the right. A spring 156, which has one of its ends anchored to a post 157 supported by the boss 149 and its opposite end fastened to a pin 158 which is attached to a head 159 that is applied to the forward end of the plunger, tends to retract the plunger with the slide 152 and hold the roller 154 thereof in engagement with the cam. The head 159 engages the rear side of a chuck located at station C to move the chuck outwardly across the turret.

Supportedvertically within suitable bearings 160 (one of which is revealed, in Fig. 4) that extend rearwardly from the housing of the machine is a shaft 161 which has secured to it above the plane of the turret a series ofof the shaft 161 is journaled within a block 163 which has an adjustable dovetail connection with a riser 164 extendin upward from the housing. A bevel pinion 165 is secured to the lower end of the cutter shaft 161 and meshes with a similar pinion 166 that is fastened to the before mentioned shaft 88 beyond the right hand end of the sleeve 87.

At station D a bracket 170 rises from the inner side of the channel, 3, this bracket being quite similar to the one located dia metrically opposite. The bracket 170 has a boss 171 at its upper end within which a spindle 17 2 is slidably mounted and the boss is divided at about its longitudinal center to accommodate two pulleys 173 and 174 that are splined to the spindle, the spindle 7 having a chuck 17 at its outer end within described.

which a tap 176 is supported for threading the bore in the shank of the yoke that is clamped in the adjacent chuck or work holder. A plate 177 is perforated at its center so that .it may be passed over the tap and brought to bear upon the face of the chuck 1.7 5, the ends of the plate havingfiexible members or cables 178 secured to its op posite ends which pass rearwardly over sheaves 179, the flexible members having connected to their depending ends a weight 180 which tends to draw the spindle inwardly to bring its inner end'181 into en gagement with the periphery of the lowest cam 182 of the aforesaid stack. This cam is of such shape asto initiate an advance movement of the tap 176 and permit of its retraction during a half rotation of the cam.

A spindle 185 is reciprocably supported in the upper end of a bracket 186 which is secured to and rises from the outer side of the trough 6 adjacent the tapping mechanism just described; and the spindle 185 hasa chuck 188 at its lower end within which is clamped the shank of a drill 189, the drill being supported near its lower end by a guide 190 that extends outward from an adj acent part of the bracket 186. The drill is thus supported in a position to bore the cylindrical bosses of the yoke that is clamped within the adjacent chuck.

A pulley 195 is splined to the spindle 185 within the head. of the bracket 186 and is driven, through a belt 196, from a pulley 200 that is carried by the upper end of a shaft 201 supported within the brackets 202 that extend from the housing in the vertical plane of the main drive shaft 51. The-shaft 201 has a bevel pinion 205 secured to its lower end which meshes with a bevel pinion 206 that is fastened to the right hand end of the main shaft so that thedrill 189 is constantly driven from the main shaft through the transmission mechanism just An arm 210 extends to the rear and upward from the upper end of the bracket 186 and has pivoted to its outer end a lever 212. This lever is forked at its forwardend to embrace a shifting collar 213 to which it is pivoted, and the collaris rotatably mounted upon the upper end of the spindle 185. The rear end of the lever has connected to it an adjustable link 214 that is guided within a bracket 215 carried by the housing 1. The link is shown as having a roller 216 at its lower end that bears upon. a cam 217 secured to the right hand end of the cam shaft 7 0 where it protrudes beyond the housing.

I have mentioned the fact that pulleys 17 Sand 174 are splined to the tap spindle 172, and I shall now explain how these pulleys are driven alternately in opposite directions to drive the tap on its cutting ex- ,pedition andthcn reverse its direction of rotation to withdraw it. On the right hand end of the shaft 55 there is loosely mounted a: gear 220 which has keyed to the inner end of its sleeved hub a pulley 221 located substantially in the vertical plane of the pulley."

173, (see Fig. 3). Another gear 222 is loosely mounted upon the hub of the gear 220 and has a pulley 223 formed integral" forth from the pair of pulleys 173 and 221,

to the pair 174 and 223 by automatic shifting mechanlsm as follows: The belt 227 is embraced by a fork 230-formed on the end of a lever 321 that pivoted at 232 to a bracket extending from the worm-wheel casing 66, and the end of'the lever opposite the fork is shown as having a roller 233which traverses the groove 234 of a cam235 carried by the cam shaft 70. The operation of this belt shifting mechai'iisn'i is obvious.

An oil pump 240 is located within the basin 8 and is driven by a belt 241 from a pulley 242 on the main drive shaft, and operates toelevate alubricating solution from the basin through the pipe 243'to a distributing pipe 244 which hasbranches for deliveriug the lubricant to the various tools.

Any chips which accumulate upon the turret to the rear of the chucks, through the drilling operation at station B, are forced from the turret by the backward movement of the chuck, as it is engaged and shifted inward by the'cam 40, and into a chute 246 horted by the vertical shaft 64' is double so that an outward movement of its corre-' sponding slide will take place upon each half rotation of the shaft 64. I do not consider these proportions essential, however, for it is obvious that the numberof-movements of these slides'may be more or less with respect to the rotation ofthe shaft without deviating from the purpose of the invention.

Having thus described my invention, what I claim is i 1. In a machine of the character set forth, the combination of a plurality of movably supported tool carriers having cam engaging portions in individual planes, dissimilar tools carried by the respective carriers, and a moving element common to said carriers and having individual cams in the respective planes of the aforesaid cam engaging portions and arranged for cooperation there with, each cam distinguishing in profile from the others according to the requirements of tool wherewith it is associated.

- 2. In a machine of the character set forth, the combination of means for supporting a plurality of pieces of work at a given elevation, a plurality of tool carriers supported at the same elevation, the work and carriers being relatively movable to present each carrier successively in operative relation to the successive pieces of work, the carriers having cam engaging portions in individual planes, dissimilar tools carried by the respective carriers, and an actuating element common to said carriers and having indi- 'vidual cams in the respective planes of the aforesaid cam engaging portions arranged to cooperate therewith to move the carrier toward the work, each cam distinguishing in profile from the others according to the requirements of the particular tool where with it is associated.

3. In a machine of the character set forth, the combination of a central actuating device,'a series of tools, work holders movable in an orbit about said device and in operative relation to the tools, elements movable to create relative movement between the work holders and tools each having a cam engaging part out of the plane ofthe corresponding parts of the other elements, the actuating device having an individual cam in the respective plane of and for cooperation with the cam engaging part of each element, and mechanism for operating the actuating member.

4:. In a machine of the character set forth, the combination of a central actuating device, a series of tools, work holders movable in an orbit about said device and in operative relation to the tools, elements movable to create relative movement between the work holders and tools, each having a cam engaging portion out of the plane of the corresponding portions of the other elements, the actuating device having an individual cam in the respective plane of and for cooperation with the cam engaging portion of each element, and mechanism for moving the work holders intermittently and positioning them in operative relation to the tools, while rotating the actuating device continually in one direction.

5. In a machine of the character set forth, the combination of a supporting structure, an annular turret movably sustained thereby, a shaft supported byv the structure in a vertical position centrally of-said turret, workholders carried by the turret, tools supported by the structure intermediate the shaft and work holders, a mover for each tool having a cam'engaging portion that is out of the plane of the corresponding portions of the movers of the other tools, cams mounted upon the aforesaid shaft, one cam in the plane of the cam engaging portion of each toolmover, driving means for the tools, and driving means for the shaft.

6. In a machine of the character set forth, the combination of a supporting structure, an annular turret movably sustained thereby, a shaft supported vertically by said structure and centrally of the turret, workholders carried by the turret, brackets rising from the structure between the turret and shaft, tool carrying spindles journaled within said brackets and capable of longitudinal movement therein, a cam engaging member associated with each spindle, the. members of the various spindles occupying different planes, a plurality of cams carried by the aforesaid shaft, one in the plane of and for engagement with each of the aforesaid cam engaging members, said cams serving to advance the tool spindles toward the work holders, means tending to retract the spindles, driving means for the spindles, and driving means for the aforesaid shaft.

7. In a machine of the character set forth, the combination of a supporting structure, a turret movably sustained thereby, work holders carried by the turret, a shaft supported by the structure in a vertical position and centrally of the turret, tool carrycam shaft, driving connections between the cam shaft and the vertical shaft, an operat ing lever for the aforesaid clutch, and a pain on the cam shaft for actuating said ever.

V 8. In a machineof the character set forth,

the combination of a supporting structure,

a turret movably sustained thereby, work holders carried by the turret, a shaft supported by the structure in a vertical position and centrally of the turret, tool carrying spindles supported by the structure, cams carried by the vertical shaft for creating relative movement between the spindles and the work holders, a'main drive shaft, driving connection between said shaft and the tool carrying spindles, the driving connection between one of the spindles and the drive shaft comprising two sets of pulleys for reverse driving, and a belt shiftable from one to the other of said sets, driving connections between the main drive shaft and the vertical shaft, a cam shaft, driving connections between the cam shaft and the vertical shaft, a shifting. lever engaging the aforesaid belt, and a cam on the. cam shaft for'actuating said lever.

9. In a machine of the character set forth, the combination of a supporting structure, a turret movably sustained thereby, work holders carried by said turret, tools supported by the structure in operative relation tothe work holders, means for creating relative movement between the tools and work holders, a main drive shaft, driving connections between said shaft and the various tools, drivingconnections between the turret and the'main drive'shaft, a lockingibolt for the turret, a cam shaft supported by the structure, drivingconnections between the maindrive Sllfifllufil'ld the cam'shafhand a: cam' carried by' the camshaft for operating the turret locking bolt.

'10. In a machine ofthe character set forth, the combination of a supporting structure, a turret movably sustained thereby, work holders carried by said turret,1tools support'ed'by the structure in operative relation to the Work holders, means fon creating relative movement between the tools and Work, holders, a main drive shaft, driving connections between said shaftwand the variousv tools, drivingconnections between the turret and the main drive shaft, means for advancing one-of the tools towards theworkv sustained by the holders: and including a push rod, a. cam shaft supported by the structure, driving: connections between the Tao mainv driveshaft and? the cam shaft, and a cam carried by the cam shaft; for" operating the aforesaid pushi rod. r

11.'In a machine of the character set forth, the combination of a supporting structure,.an' annular turret-movably sustained thereby, a shaft supported vertically by said structure and centrally of the'turret, worka holders carried by the turret, tool carrying spindle's-journaled; within the structure, the spindles and work holders'being capable of relative movement, a cam engaging member associated with each spindle for creating relative movement between it and'a work holder, the members'associated with the various; spindles occupying diflerentplanes, a plurality of. cams. carriedby the aforesaid shaft, oneiin the plane. of and for engagement with. each oftheafbresaid cam engaging members, driving-means for the spindles, and drivingmeans' for the aforesaid shaft.

12. In a: machine: of. the character set forth, the combination ofa supportingstructure, a turret movably sustained: thereby,

work holders carried by the turret; a shaft supported by thestructurein; a vertical: position and centrally of the turret, toolcarryingspindles supported by the structure,

cams carried by the vertical. shaft for, creating, relative movement-between the spindles and the workholders, driving means: for

the spindles, and driving mcansfor the vertical shaft. Y

13. In a machine of the character set forth, the combination of a supporting structure; a turret movably sustained thereby Work ld s carried by the turret, a

shaft supported by the structure in a vertical position and centrally of the turret,

tool. carrying spindles supported by the ing spindles supported by the structure,

cams carried by the vertical shaft for create ing relative movement between the spindles and the work holders, and driving mechanism=having operativeconnection with the spindles, the vertical shaft, and the turret, a clutch incorporated in the connections be tween the driving mechanism and the turret,

and a'cam' included; in the mechanism for actuating the clutch; r V

v 15. In a machine of the character set forth, the. combination of a supporting structure, a turret movably sustained thereby, work hold:-

ers carried by the turret, a; shaft supported by thestructure in a vertical; position and centrally of the turret, tool carrying spindles supportetbby the structure, cams carried 7 by the vertical shaft for creating; relative movement between the spindles and theworlc holders, driving mechanism, operative connections betweensthe driving mechanism and the-spindles, connections between one of the spindles and the: driving mechanism incorporatingreversmg means, means included 1n the driving mechanism for actuating the reversing' means, and driving means for the vertical shaft; 1 1

16'. In-amachine of the character set forth, the: combination of a'supporting structure,

a turret movably sustained thereby,- work Q holders carried. by said turret, toolssup';

ported by the structure in operative rela tion to the, work holders-,means for creating relative movement between the tools and work holders, drivingmechanism, operative connection: between the driving mechanism andwthe turret: for imparting; intermittent movementto: the turret, means for locking the turret, meansactuatedby the driving mechanism. for operating the locking means,

and means for driving the tools. g 17. In a machine of. the character set forth the combinationof a supporting structure, a turret movably sustained thereby, work holders carried by said turret, tools supported by the structure in operative relation to the work holders, means for creating relative movement between the tools and work holders, a main drive shaft, driving connections between said shaft and the various tools, driving connections between the turret and the main drive shaft, certain of the aforesaid means including a push rod for advancing the work toward a tool stationarily supported by the structure, a cam shaft supported by the structure, driving connections between the main drive shaft and the cam shaft, and a cam carried by the cam shaft for operating the aforesaid push rod.

18. In a machine of the character set forth, the combination of a supporting structure, a turret 'rotatably supported thereby and having radial grooves, work holders guided within said grooves, and an actuating element situated centrally of the turret for moving the work holders radially of the turret.

.19. In a machine of the character set forth, the combination of a supporting strucwork holders shiftable radially of the turret, an actuator disposed centrally of the turret for moving the work holders outwardly, means for rotating the turret, and passive means situated beyond the periphery of the turret for moving the work holders inwardly as the turret is rotated.

20. In a machine of the character set forth, the combination of a supporting structure, a turret rotatably supported thereby, an actuator situated within the outline of the turret, and work holders carried by the turret and shiftable by the actuator toward the periphery of the turret.

21. In a machine of the character set forth, the combination ofa supporting structure, a turret rotatably supported thereby, an actuator situated within the outline of the turret, work holders carried by the turret and shiftable by the actuator toward the periphery of the turret, and passive means situated beyond the periphery of the turret for moving the work holders inwardly as the turret is rotated.

In testimony whereof, I hereunto affix my signature.

NATHAN F. FRETTER.

cmmcae or Coi'rpctfun.

It is hereby certified-that in Letters Patent NcL- '1,408,997,'graned March 7. 1922, upon the applieation of Nathan F. Fretter, of Cleveland, Ollie, for an improvement in Lathes, ere-ore appear in the specification requiring correction as follows: Pages 4 aid 5, line 127 of olefin 11nd linens of claim 2, strike out the-vyon i diesimilafl; andf-that the said' Letters Patent should be read with these correefime therein that the same may conform t0 the recegd of the casein the Patent Office. v

si ned'md sealed this. mi do} of April, 4A)., 1 22.

1mm I KARL FENNING,

Ac'thwcbmmiuioner 9}: Patents.

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