US2031135A - Lathe - Google Patents

Description

Feb. 18, 1936 LATHE Filed Feb. 26,. 1854 8 Sheets-Sheet l gm wanton Ck aria .5, VV. milk,

c. w. SMITH 203L135 Feb. 18, 1936. c. w. SMITH ZUBLUS LATHE Filed Feb. 26,. 1954 s Sheets-Sheet 2 6mm; '70? S th w, fizz ML mg 1 athozwewy 4 C.. W. SMITH Feb. 18, 1936.

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Filed w. SMITH 2033,13

LATHE Feb. 26, 1954 s Sheets-Sheet 4 gj dz 5.

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c. w. SMITH QMELHS LATHE Feb. 18, was.

' Filed F eb. 26, 1934 8 Sheets-Sheet 5 ChCLTZS "VIZ'SmiIZI/ dbliomqg c. w. SMITH Feb. 18, 1936.

LATHE Filed Feb. 26, 1954 T a Sheets-Sheet 6 62L 6213286 ISrni'Z Zp Feb. m, 1936, VG W, mm mums LATHE Filed Feb. 26, 1934 8 Sheets-Sheet 8 Patented Feb. 18, 1936 UNITED STATES PATENT OFFICE 6 Claims.

The present invention relates to lathes; and its object is, generally, to provide a lathe improved in various respects hereinafter appearing; and more particularly, to provide in a lathe a lathe stock having a member freely rotatable about the axis of the lathes turning operation with a coaxial bore through which the work is axially fed but is held against transaxial movement; and further, to provide in connection with such a stock a cutter for reducing the work to a diameter fitting in said bore; and further, to provide a lathe having such a cutter, a tool for cutting the side of the work, a tool for cutting the end of the work, a tool for severing a finished length of the work, means for feeding the work, and

means for operating the feeding means, the cutter and said tools; and further, providing such last-mentioned means which include cams on a driven shaft; and further, to provide improved means for mounting said tools and adjusting the same; and further, to provide in such a lathe means for forming a dowel and the like with a helical groove and a longitudinal groove and beveling the ends of the dowel; and further, to provide in a lathe improved work-feeding means; and further, to provide these parts and means in combinations.

These and any other objects hereinafter appearing are attained by, and the invention finds preferable embodiment in, the lathe and lathe parts particularly described in the body of this specification and illustrated by the accompanying drawings, in which:

Figure 1 is an elevational front view of a lathe;

Figure 2 is an elevational front view (enlarged) of right-hand-end portions thereof, partially sectioned axially on a vertical plane;

Figure 3 is a transverse sectional view of parts thereof taken on line 3-3 of Figure 2;

-Figme 4 is a transverse sectional View of such parts taken on line 4-4 of Figure 2 (said parts in these two views being turned a quarter way 45 around from position shown in Figure 2) Figure 5 is an elevational front view (enlarged) of left hand-end portions of the lathe partially sectioned axially on a vertical plane;

Figure 6 is a transverse sectional view of parts 50 thereof taken on line 6-6 of Figure 5;

. Figure '7 is a transverse sectional view of parts thereof taken on line 'l-'l of Figure 5;

Figure 8 is a plan view of a ratchet bar of the lathe and adjacent parts thereof, the lathes frame being sectioned on line 8-8 of Figure 1;

Figure 9 is an elevational front View of the same partially sectioned on line 9-9 of Figure 10;

Figure 10 is a right hand-end view thereof partially sectioned on line Ill-4|] of Figure 8; 5 Figure 11 is a transverse sectional view of parts thereof taken on line ll-Il of Figure 9;

Figure 12 is an elevational front view of mounting parts of the work piece-severing tool;

Figure 13 is a transverse sectional view there- 10 of, showing its operating cam means, taken on line l3--l3 of Figure 12; V

Figure 14 is a sectional view of parts thereof taken on line l4-|4 of Figure 13;

Figures 15 and 16 are side views of said sever- 15 ing tool showing the same in oppositely set positions relatively tothe work piece (shown in axial section) Figure 1'7 is an elevational side view of the mounting parts of the tool for cutting the side of 2 the work piece, partially sectioned on line l'|-l I of Figure 18;

Figure 18 is a right hand-end view of the same with said tool, showing the operating cam therefor and partially sectioned on line l8l8 of 25 Figure 17;

Figure 19 is an axial sectional View of parts thereof taken on line |9-l9 of Figure 17;

Figure 20 is a right hand-side view of the tool for sizing or reducing the work piece to desired diameter, and mounting parts for said tool;

Figure 21 is a side view of cam means for traveling the ratchet bar and work piece endwise;

Figure 22 is an operative-end view of said 35 means, its shaft being sectioned on line 22-22 of Figure 21;

Figure 23 is a view in perspective of the removable cam member of said means;

Figure 24 is a side view of cam means for operating the tool for cutting the extremity of the work piece;

Figure 25 is an operative-end view of said means, its shaft being sectioned on line 25-25 of Figure 24;

Figure 26 is a view in perspective of the re-, movable cam member of said means;

Figure 27 is an axially sectional view ofcam means for operating the work piece-severing tool, taken on line 21-21 of Figure 28;

Figure 28 is a side view thereof, its shaft being sectioned on line 28-48 of Figure 27;

Figure 29 is a View in perspective of the removable cam member of said means;

Figure 30 is a side view of a work piece;

Figure 31 is a view of the finished extremity of the work;

Figure 32 is an axial sectional view of said finished work;

Figure 33 is an elevational front view of a portion of the lathe showing means for retracting the work piece from the sizing means;

Figure 34 is a plan view of the left hand-end portion of the lathe;

Figure 35 is a side view of adjustable means for retracting the tool for cutting the side of the work piece;

Figure 36 is a right hand-side View of means for sizing the Work piece;

Figure 37 is an axial sectional view thereof taken on line 3'I3I of Figure 36 and showing a four-sided work piece therein;

Figure 38 is an axial sectional view of a modified construction of parts similar to those shown in Figure 37 but Without a sizing tool and showing a rotatable holder sleeve for the work piece hexagonal in cross section;

Figure 39 is a transverse sectional view of said holder'sleeve and work piece taken on line 3939 of Figure 38;

Figures 40, 41, 42 and 43 are transverse sectional views of modified constructions of said holder sleeve and work pieces therein;

Figures 44 and 45 are respectively side and end views of a plunger or reciprocating rod carrying a tool for cutting the extremity of the work;

Figure 46 is a side view of another example of finished work produced by the lathe as seen in Figures 38, 39 with an end portion of the work piece from which it is severed;

Figure 47 is a plan view of parts of the lathe showing a modified construction thereof whereby helically and longitudinally grooved dowel pins and the like may be made;

Figure 48 is an elevational front view thereof partially sectioned axially on a vertical plane;

Figure 49 is an end view of parts of the tail stock thereof (enlarged);

Figure 50 is a front View of the same partially sectioned on line 5050 of Figure 49;

Figure 51 is a plan view of parts shown in Figures 47 and 48;

Figure 52 is a side view of a dr-ill bit which may be inserted into the plunger I00 Figure 53 is a side View of a grooved dowel pin; and

Figure 54 is a sectional view of parts shown in Figure 51 taken on line 5454 of that View; and showing additional adjacent parts.

In the embodiment of the invention illustrated by these drawings a lathe is shown having a frame or bed I with spaced front and rear sides 2 supported on suitable legs 3 and carrying the operative parts. By this lathe a work piece may be fed or moved lengthwise to cutting tools whereby it is reduced to desired diameter, its side and extremity cut to predetermined form, and finished pieces'of work successively severed therefrom.

This lathe and its parts and the operation thereof are described as follows. The lathes head stock parts 4, 5, 6 coaxially spaced along the lathes frame carry rotatably therein the lathes mandrel or arbor designated generally I comprising the hollow cylindrical outer member 8 and the inner member 9 axially slidable in said outer member and splined therewith by keys I E! in the keyways I I. The open right hand-end of the head stock part 4 is closed by a tubular extension I2 in which the right hand-end portion of the inner member 9 may be moved, this extension having a screw cap I3. The head stock parts 4, 5 are fixed as by bolts I4 on the frame, while the part 6 is movable therealong, its depending edge portions I 5 slidably bearing on the upper edges of the frames sides 2.

It will be seen that the mandrels outer member 8 is rotatably mounted and held against axial movement in the fixed parts 4, 5 of the head stock, while the inner member 9 is thus mounted and held in the slidably movable part 6.

A work piece, such for example as is shown at I6 in Figure 30 having conically tapered ends I1, is inserted in the lathe, one of said ends being received in the funnel shaped mouth I8 of the opening I9 extending through the lathes tail stock 26 fixed on the lathes frame, said opening axially aligning with the mandrel, and the head stock part 6 is slid along the frame to a position wherein the work pieces other tapered end is received in the socket 2| of the chuck end 22 of the mandrels inner member 9, said member being drawn outwardly by thus sliding the part 6 of the head stock. In such sliding movement the dog 24 of part 6 engages a tooth of the ratchet bar 25 mounted in a groove of a carrying bar 26 slidable or movable parallelly with the mandrel as between pairs of rolls 2'I rotatively mounted at 28 on a cross bar 29 extending between the frames sides 2 as shown in Figure '7. The tail stock '20 fixed on the frame has a preferably removable middle portion 30 (see Figure 37) through which said opening I9 extends, and the funnel shaped mouth I8 of this opening is provided with a cutting tool 3| clamped as by a bolt 32 in a mounting member 33 pivoted at 34 on the right-hand side of the tail stock and adjustable by a set screw 32 relatively to the axis of said opening so that the extreme cutting edge 36 of said tool may be set to register with the circular side 31 of said opening (see Figure 20).

To carry out the lathes operations, the work piece I6 is rapidly rotated and the shaft 46 is simultaneously but slowly rotated by suitable means such for example as are indicated in Figure 1. As shown in this view the mandrel is rotated by an electric motor 38 through the belt 39 on the sheaves 40, M of said motors shaft and the mandrels outer member 6, and the shaft 46 is rotated in its bearings 41 by the motor 48 through the belt 49 on the sheaves 50, SI of said motors shaft and the shaft 42 journalled at 43, and by the belt 52 on the sheaves 53, 54 of shaft 42 and shaft 55 journalled at 56, and by the meshing gears 51, 56 of shafts 55, 46. Thus the work piece I6 is rapidly rotated (the chuck end 22 having means as the threads 59 for turnably engaging the work piece), and said work piece is comparatively slowly fed lengthwise toward the left-hand side of Figures 1 and 5, by the bar 25, 26 engaging the dog 24 of the head stock part 6, said bar being moved to effect such feeding by a cam wheel 60 on said shaft 46 having the cam member 6I detachably mounted thereon as by the screw bolt 62, as particularly shown in Figures 21, 22, 23, this bar 26 having a roll 63 traveling on the cam and surface of said member so that as this roll rides up on the cams rise 64 between its low and high dwells 65, 66 the work piece is fed and the cutting tool 3| reduces its outer end portion 61 to the desired diameter, as particularly seen in Figure 37, in so doing tapering the work pieces portion 68 (inwardly from its end portion 61) correspondingly with the funnel mouth I8; As this circular end portion 61 is thus fed it is forced into and through the circular opening I9 of the tail stock 20 in which it tightly fits, said end portion having been reduced to such fitting diameter by the proper setting of the cutting tool 3I.

Said opening I9 being through the sleeve 69 which is freely rotatable in the tail stock and desirably provided with ball bearings 10 in a race 1I therein, the work piece in its rotation carries said sleeve with it and is firmly held thereby against lateral movement or vibration throughout the various cutting operations to which it is subjected.

When the work piece has been thus reduced to the desired diameter and fed lengthwise far enoughthrough opening I9 to provide an end portion 61 projecting from the left hand side of the tail stock far enough for the forming of a finished piece of the desired work ('as for example the drawer pull 12 shown in Figures 31, 32), the work piece I6 is held against retracting movement by the high dwell 66 of the cam member 6 I. Said projecting end portion61 of the rotating work piece is now out at its sides by a cutting tool of cross sectional shape corresponding to the desired side formation of the work, such for example as the tool 13. This tool is mounted for adjustment to various positions as particularly shown in Figures 1'1, 18, 19. As shown in these views, the lever 14 is fulcrumed on a rod 15 on the brackets 16 bolted at 11 on the rear side 2 of the lathe frame to turn on an axis parallel with the mandrel. The short arm 18 of this lever has a cross-sectionally round bearing 19 in which the approximately vertical spindle of a block 8| is adjustable axially and turnably to positions in which it is held by the set screw 82. This block has a spindle 83 approximately parallel with the mandrel, which spindle may be adjustably turned in the bearing 84 of the split member 85 in opposite directions by the set screws I12, I13 threaded in said member and engaging diametrically opposite shoulders I14, I15 of spindle 83, this member 85 being additionally held in such adjusted positions by the set screw 86.

On the upper face 81 of member 85 a slidable block I16 may be clamped by a bolt 88 extending through block I16. 0n the flat upper face I11 of block I16 the cutting tool 13 may be slid and turned to desired adjusted positions and clamped therein by a bolt I18 extending through the clamping bar 89, whereby the adjustment of this tool relatively to the work pieces end portion 61 is effected.

A cam wheel 90 on shaft 46 carries by the bolt SI a removable cam member 92. It will be seen that as this shaft 46 and cam wheel 90 rotate the roll 93 on the long arm 94 of lever 14 rides up on the cam surface 95 of said member thus swinging the cutting edge 96 of the tool 13 toward and into the side 91 of the end portion 61 of the work piece, along the dotted line a which is circularly arcuate relatively to the levers fulcrum 15. The member 85 may be set by the screws I12, I13 to different angular positions about the axis of the spindle 83 as may be desired to vary the angle at which said cutting edge engages the work pieces side 81, and the tool may be clamped by the bolt I18 in desired longitudinal positions for varying its cutting depth, and it may be turned on and parallelly with the face I11 to desired clamped positions. The lever 14 is moved by the cam 92 against the pressure of a spring I18 surrounding the rod I80 threaded at I8I and connected to. a cable or chain I82 passing over a pulley I83 mounted on the frames rear side 2 and connected at I84 to the member 85, this spring being adjustably tensioned by a nut I85 on the threaded end of said rod, as seen in Figure 35.

The cam wheel 80 has an enlarged hub portion 2I1 fitting in the bore 2i8 of the cam member 92. A gap 2I9 in this bore is adapted to receive shaft 46 transaxially whereupon member 92 is slid axially to receive said hub portion fittingly in said bore in assembling the parts.

The extremity 88 of the end portion 61 of the work piece may be cut or circularly grooved to desired form, such for example as is shown in Figure 31 which illustrates finished piece of worka drawer pull.

This cutting operation is eilected by the relative rotary and axially-approaching movements of the work piece and the plunger or reciprocating rod I00 slidable in bearings IOI in the cross bar I02 fastened on the lathes sides 2 as by bolts I03 and carrying a suitably shaped cutting tool 99 projecting from the inner or right hand-end of this plunger and removably held in adjusted position by a set screw I86 (see Figure 5, 44, 45).

This plunger is slid inwardly by the cam wheel I04 on shaft 46 having the cam member I05 removably secured thereto by bolts I06 as shown in Figures 24, 25, 26.

A roll I01 on the downwardly extending arm I08 of said plunger travels on the cam end surface I09 of said member. It will be seen that as said shaft and cam member rotate and the roll rides up on the rise I I0 of said surface the plunger I 00 is slid inwardly to a position in which it is held by the high dwell III of said cam surface, during which sliding movement the extremity of the end portion of the work piece is cut.

The finished piece of work (as said drawer pull shown in Figures 31, 32) is now severed from the work piece I8 by a cut-off tool I I2. This tool, with its mounting and adjusting means, is particularly well shown in Figures 12-16. As thus shown, said tool is clamped by a set screw H3 in endwise adjusted position in the squared i:

socket II4 of the inner member H5 of an arm II6, slidable in a bearing H1 in the outer member II8 of said arm by a screw H9 threaded at I20 in said outer member and oppositely threaded at I2 I in said inner member.

The inner member H5 and the tool being thus slid toward the work pieces end portion 61, may be clamped in adjusted position by the set screw I22. This tool-carrying arm H6 is pivotally mounted to turn in a substantially vertical plane, 2

on a bracket member I23 pivoted at I24 on the front side 2 of the lathe frame to be turned in a vertical plane parallel therewith to adjusted positions wherein it is clamped by the screw I25 extending through said members slot I26 and threaded in said side of the frame. This arm I I6 is pivotally mounted on the bracket member I23 by pointed screws I21 threaded in said members upward arms I28 and engaging in the ends of a threaded rod I253 extending through an opening I30 in said arm, on whose opposite sides nuts I3I on said rod are turnably clamped to hold said arm in accurately adjusted positions in the lengthwise direction of said rod and of the lathes mandrel. The bracket member turned on its pivot I24 upwardly to clamped position to incline the tool I I2 inwardly to provide a conical depression I32 in the inner end of the severed piece of work as shown in Figure 15, or downwardly to provide said piece with an out- I23 may be F wardly conical end'portion I33 as seen in Figure 16, said bracket member being adjusted to an intermediate position to provide said piece with an end at right angles to its side.

This severing tool H2 is operated by means particularly well shown in Figures 13, 27-29. The shaft 46 has a cam wheel I34 on whose side is removably mounted a cam member I35 by a bolt I36. A roll I31 on the downwardly extending portion I38 of the inner member H5 of the arm I I6 travels on the cam surface I39 of this cam member.

It will be seen that as this shaft 46 and said cam wheel with its member I35 rotate, this roll rides up from the cam surfaces low dwell I40 onto its rise I 4| the arm I I6 is raised so that the tool I I2 severs the'piece'of work from the rest of the work piece I6 in the lathe.

It will be seen that this work piece being rotated by the mandrel I and moved lengthwise by the rotation of the shaft 46 through its cam elements 60, 6| far enough to cut by the tool 3| a sufficiently long end portion 61 of the work piece to proper diameter for the desired piece of work 72, the rotating work piece is held by the high dwell 66 of cam 60 against axial retracting movement while the operations of the other cutting tools are performed; and that these further cutting operations are actuated in the continued turning of shaft 46 by its various cam elements so formed and so angularly spaced about said shaft as to effect these several cutting operations in properly timed sequence.

These operations being completed, and the cam elements 60, 6| turning to their low dwell 65, the ratchet bar 25, 26 is drawn by spring I42 to initial position, the work pieces unsevered end portion remaining held in the sleeve 69 and the dog 24 slipping over the teeth of said bar, and the cam elements I04, I05 turning to position wherein the roll I 01 of plunger I reaches the low dwell I44, the spring I45 draws said plunger back, and the parts are returned to their initial positions, the lathes cycle of operations being completed and its parts ready for the next cycle for forming another piece of work from the end of the work piece.

In order to withdraw the stub of the exhausted work piece from the sleeve 69, I provide a hand lever I46 fulcrumed at I41 on the front side of the lathe, its arm I48 engaging the pivot pin I49 of the dog as shown in Figure 33.

In Figures 38-43 various forms 69 69 69 69 and 69 are shown which (and others not shown) may be adopted in place of the sleeves 69 in the tail stock 20. In these views, the work piece I6 I6 I6 I6 and I6 are not shown as being reduced by such a cutter tool as is shown at 3| in other views to form a cross sectionally round end portion 61, but the cross-sectionally rectangular, polygonal or fluted work pieces pass through the tail piece 20 in their initial form, and the projecting end portions thereof are shaped and severed in the manner shown in other views.

The sleeves 69, etc. in which the work pieces tightly fit as shown in Figures 37-43 have a radial flange I50 at their inner ends against which abuts one member I5I of the ball race II, the members I 5|, I 52 of this race being removably held in the circular socket I53 in the middle portion 30 of the tail stock 20 by a ring plate I54 threaded at I55 on said sleeve, and all these parts being removably held in said socket by screws I56 extending through the ring plate I51 and threaded in the middle portion 30 of the tail stock.

In Figures 8, 9 and is shown means for cushioning the retracting movement of the bars 25,26 and for insuring the engagement of the dog 24 with the teeth thereof, said means including a spring or resilient rubber I58 which the inner end of the retracting bar strikes, held in a socket I59 of a member I60 adjustable longitudinally of the lathe by a bolt 6| extending through its slot I62 and threaded in the bracket I63 mounted at I 64 onthe frame. This spring or rubber may be moved-in said socket to the desired degree by a screw I65 threaded in said member and engaging the springs inner end. The carrying bar 26 has a rearward side extension I66 with an inclined face I61 on which slidably bears in said bars movement a leaf spring I68 mounted by a bolt I69 on said bracket, its tension being adjusted by the set screw II0.

In Figure 46 is shown in side view, another example I2 of finished work that may be made by this lathe, such example being the handle of a screw driver or the like. This pieces end portions I9I I92 are properly shaped by tools spaced apart to leave the middle portion I 90 of the piece uncut, said tools being mounted and operated,

in the same manner as the side-cutting tool I3 shown in other views. This piece I2 being severed as in other cases from the rest of the work piece I6 other like pieces may be successively formed and severed therefrom.

It will be seen that the various cam members may be replaced with others having desired cam surfaces; that the cam wheels carrying said members may be secured by their shown set screws in turned positions on the shaft 46 to provide desired sequence of operation of the cutting tools; that ratchet bars 25 having teeth spaced at desired intervals may be clamped by the bolt IT! in the carrying bar 26; and that the various cutting tools may be adjusted with great nicety to desired operative positions, etc. It will also be seen that the cutting tools are so mounted that their cutting edges extend toward the front of the lathe, i. e., toward the operator, so that the chips are thrown away from him.

In Figures 47-51 and 54 is shown a modified construction of portions of the lathe whereby helically and longitudinally grooved dowel pins and the like may be made and their ends tapered. As thus illustrated, the plunger I00 has a bore I93 in its inner end in which may be inserted the shank of an extension member I94 clamped by a set screw I95. This member has an axially-offset portion I 96 with a squared socket I 91 in which the tool I98 is clamped in adjusted position by the set screw I99. The end portion 61 of a rotating work piece I 6 formed and held projecting from the tail stock 20 (as hereinbefore described) is grooved longitudinally at 2| 4 by tools 2 I0 adjustably secured by set screws 2II in radial bearings 2I2 formed in the side of the sleeve 69 which rotates with the work piece, this longitudinal grooving being done during the feeding of the Work piece as hereinbefore described.

The rotation of the work piece is very rapid and so is its feeding movement; but the movement of the plunger I00 toward the right handside of Figures 47 and 48 is about twice as fast as the feeding movement of the work piece in the opposite direction, effected by the sharp rise 208 of the cam member I05 on shaft 46 on which cam rides the roll IN on arm I08 of plunger I00 As a length 61 of the work piece sumcient to form the dowel (say a length of two inches) is fed far enough the approaching tool I98 engages it and, as the movement of plunger II'IIJ carrying this tool and the opposite feeding movement of the work piece continue, said tool cuts the helical groove 282, the relative speed of movement of this tool and the fed movement of the work piece being such that said tool begins to cut the helical groove at the time the work piece has been fed to a position about half said dowel length (i. e. about one inch) from the left handside of the tail stock 20. The helical groove having been thus cut the entire length of the dowel, the plunger I88 and tool I98 stop movement, the roll IU'I now riding on the high dwell 201 on the cam member I85 During this stopped movement and as shown in Figure 54, a tool 2 I is moved toward the rotating work piece to form a circular groove 203 therein. Said tool 2I5 is thus moved by suitable means as by being mounted by the bolt 88 on the block 85 in place of the tool I3 shown in Figure 18. This circular groove being formed, the cutoff tool II2 mounted as hereinbefore described on the arm II5 as shown in Figure 13 moves upwardly into said circular groove to sever said dowel from the work piece. This circular groove provides bevelled or tapered opposite ends 20I of the dowel I2 as shown in Figure 53. These operations being finished, the

roll III'I rides down on the sharp drop- 2 I6 of said cam member whereupon the spring I45 suddenly retracts tool I98 to initial position preparatory to forming the next dowel.

In Figure 52 is shown a drill or augur bit 2I3 which may be inserted in the plungers bore I93 to form an axial hole in the work piece.

The invention being intended to be pointed out in the claims, is not to be limited to or by details of construction of any particular embodiment thereof illustrated by the drawings or hereinbefore described.

I claim:

1. In a lathe: a tail stock; a member mounted in the stock for freely rotative movement with the work about the axis of the lathes turning operation, said member having a circular bore therethrough coaxial with said axis receiving and holding the work therein against transaxial movement but permitting the free axial feeding movement of the Work through the bore.

2. In a lathe: a tail stock having a cutter for reducing the cross-sectional area of the work fed thereto; a member mounted in the stock for freely rotative movement with the work about the axis of the lathes turning operation, said member having a circular bore therethrough coaxial with said axis receiving and holding the reduced work against transaxial movement but permitting the free axial feeding movement of the work through the bore.

3. In a. lathe: a cutting tool; a tail stock; a member mounted in the stock for freely rotative movement with the work about the axis of the lathes turning operation, said member having a bore therethrough coaxial with said axis receiving and holding the work against transaxial movement but permitting the free axial feeding movement of the work through the bore; means for simultaneously feeding and rotating the work whereby a longitudinal groove in the work is cut by the tool, said tool being rotatable with the work.

4. In a lathe: a frame; a lathe stock movable on the frame in the works axial direction; workfeeding means comprising a bar movable in. said direction on the frame and having an inclined side portion and spaced teeth; a dog on said stock engaging the teeth; a spring pressing said inclined side portion to move the bar into engaging position with the dog.

5. In a lathe: a block turnably mounted on the lathes frame and having arms spaced in the frames longitudinal direction; means for releasably fastening the block in turned position; a threaded rod; a tool-carrying member movable along the rod; nuts on the rod at the opposite sides of said member for clamping the same in adjusted position on the rod; aligned screws threaded in said arms and having at their inner ends hearings on which the rod is turnable, said screws being turnable in said arms to move and hold the rod in lengthwise adjusted position.

6. In a lathe: a lever fulcrumed on the lathes frame to be swung in a vertical plane and having an axially vertical bearing; a block turnable in said bearing to 'adjustably held positions; a second block mounted on the first-mentioned block to turn in a vertical plane to adjustably held positions; a tool-carrying member adjustably mounted on the second-mentioned block; a tool adjustably mounted on said member; means operated by the lathes driving means for swinging the lever to move the tool toward the work in the lathe.

CHARLES W. SMITH.

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