US1920302A - Metal working machine - Google Patents

Description

A118- 1, 1933- c. c, GRoTNEs METAL WORKING MACHINE Filed July 30, 1950 4 Sheets-Sheet 1 4 Sheets-Shea?I 2 C. C. GROTNES METAL WORKING MACHINE Filed July 50, 1930 Aug. 1, 1933s ug- 1, 1933- c. c. GRoTNEs METAL WORKING MACHINE Filed July 30, 1950 4 Sheets-Sheet 5 @7% C @m/7366, @y M A Qt?,

4 Sheets-Sheet 4 @r U@7a2/Mead @m A Aug- 1, 1933 cc. GROTNES METAL WORKING MACHINE Filed July 30, 1950 Patented ug. 1, 1933 l' oNir-sofsTATs Piarsnr orrics 1,920,302 METAL WORKING MACHINE oa'ri c.` armes, Park mage, n1. Application July 30, 17930. Serial No. 471,653

' as claims. (c1. 15s- 2.) y

This invention relates to a metal working machine which is adapted to operate upon annular metallicV objects, such as automobile wheel rims and it is more particularly'directed to a machine for operating upon rims for wire wheels yto form i therein inwardly projecting sockets intended to receive the heads of wire spokes anchored in the rim.

One object of the invention is 'to provide a machine of simple and rugged construction in Ywhich an annular object such vas a wire wheel rim may be quickly and efficiently shaped and sized.

Another object is toprovide a machine ofthe character indicated having two sets of dies be# tween which a rim is interposed7 one set operating to chuck or 4hold the rim while the otherset operates to form spoke sockets in the rim. l A further object is to provide in a machine of the character set forth an improved actuating means for the two sets of dies such that not onlyinay the shaping andY sizing operation be performed at a high speed, Vhut it may he performed Figure 1 shows avertical central section ofV a machine embodying `the invention in its preferred form, the machine being shown with the dies in their open or retracted positions.

Fig. 2 is a fragmentalview similarto Fig. 1 showing the dies in their closed positions with a rim compressed therebetween..

Fig. 3 is a fragmental plan view of the `earn shaft and the associated parts as viewedfrom the line 3 3 of Fig. 2.

Fig. 4 is a transverse sectional view taken subv stantially along the line 4f-4 of Fig. 2 withthe stroke-adjiistinrr mechanism omitted for the sake of clearness. Fig. 5 is a frontv viewed from the line 5-5 of Fig. l.

Fig. 6 is an enlarged frag-'mental section of lthe die blocks showing themeans employed ing sockets in the rims.

Fig. 'Y is a fragmental section similar to Fig. 2 showing an alternative embodiment of the invene tion, the dies being shown `in their closed positions. Y

for formelevational view ofthe machine,

Fig. 8 is` a fragmental portion of Fig. 7 showing Y the parts of the actuating mechanism in the positions which they occupy at the beginning of al die-closing operation.

Fig. 9 is a fragmental plan the vlineQ-S) of Fig. 7.

While I have shown in the` drawings and will' herein described in detail the preferred embodinientof my invention, together with one alternative embodiment thereofit is to he understood that I do `not thereby intend to limit the invention to the specific forms disclosed, but aim to cover all rmodifications and alternative construc-V tions falling within the spirit and scope of the invention as expressed in the appended claims.

Invpursuance of the foregoing and other ohview as seen from jects, the*Y inventionas herein illustratedr provides a power operated rn'laclline embodying an axially movable table having two annulariy arranged sets of opposed, movable dies between which a rim may be compressed by radial movement of the opposed blocks toward each other,y together with means operable in a uni-directional movement of the table and including vcam sur-` faces coacting in the intial `portion of such movement to cause outward radial movement of the inner dies to engage and hold the rim and at the same vtime to deine the proper diameter for the rim, and toggle links operating in the continued movement ofthe table, while the coacting cam surfaces are relatively xed, to cause inward radial movement of the outer blocks to form the sockets and compress the rim against the inner blocks so as to insure proper form and size in the nished rim.

`@ne advantageous fo'rin of the invention is illustrated in Figs. l to 6 of the drawings and comprises 'a machine with. a base or main frame 10 having an upwardly and forwardly inclined portion 11 of rectangular cross section (Fig. 4) terminating at its upper forward end in four arms 12 which` project upwardly andforwardly from the four corners of the portion l1. )Positioned `oetween the arms 12 and in a plane substantially perpendicular 'to the longitudinall axis of the inclined portion ll is a movable work carrier or frame in the form of a table 13 supported forniovement axially of the inclined portion l1 by a plunger-like slide 14 guided in a suitable slideway 15 formed in the portion-'11. The slide 14 has a anged hub 16 at the outer.

Aend, to which the table 13 is secured, and extending downwardly and rearwardly from this hub isa pair of spaced bars 17 adapted to engage the slideway 15 as shown in Figs. 1, 2k andl son, 21, 21a and 22.

The slideway in the form shown is formed by an upwardly opening rectangular recess (Fig. 4) in the frame portion 11, in which the slide 14 is retained by means of bars 18. ln the operation of the machine Ythe table 1 is reciprocated to operate the various forming and sizing means, and to perform any other desired operation on the work; and to impart the desired reciprocation to the table a pairof spaced eccentrics 19 (Figs. 1, 2 and 3l are employed. These eccentrics-are carried by a shaft 20suit ably journaled in the lower end of the frame portion 11 and driven from a suitable power` source (not'shown) through speed reducing gears The eccentrics 19 are connected to the slide 14 by spaced links 23 pivoted to a cross head 24 slidably positioned between the two bars 17 of the slide, as shown in Fig. 4.

The forward stroke of the table 13 in theV present instance constitutesthe sole working stroke, and the forward movement ofthe cross-head 24 is accordingly positively 'transmitted to a crossbar 25 (Figs. 1 and 2)Y which connects the two bars 17 of the slide 14. This is done through the medium of a wedge26 interposed between the cross-bar 25 and the cross-head 24, the rwedge being vertically adjustable by a screw device 27 so that the forward limit of the table movement maybe adjusted. Rearward movement of the crossdicad 24V is yieldingly communicated to the slide through a pair of transversely spaced bolts 28 (Fig. l) which` extend from the cross-bar 25 rearwardly through brackets 24f-`flxed on the cross-head and have coiled springs 29` between heads of the bolts`2 and the brackets 24a to hold the head 24.- yieldingly against the wedge 26.

To properly size and form an annular metal rim positioned on the table 13, two opposed, annularly arranged sets of radially movable diecarrying blocks are mounted on the forward side of the table, the expanding die blocks 30 of the inner set and the contracting die blocks 3l of the outer set being mounted for radial sliding movement upon the table. The inner die blocks 30 have flat base plates projecting outwardly to provide supports for the outer die blocks 31, interengaging grooves and projections on the blocks and thetable serving to guide both sets of blocks for radial movement. The die blocks 30 are urged inwardly by springs 33 each held in place by two axial pins 34 respectively mounted in the die blocks 30 and suitable lugs 35 secured on the table.

In order that the machine may readily be adapted for various operations, each of the inner die blocks 30 has a suitable formed die 36 removably secured on its outer surface by tap screws 36a while .the outer die blocks 31 have complementary dies 37 secured thereto by tap screws 37a.

Certain of the outer dies 37 may be provided with inset bosses 3S (Fig. 6) which will serve to form outwardly facing sockets 39 in a metallic rim 40, suitable recesses 4l being formed in the opposing dies 35 to receive the displaced metal. The bosses 38, together with their corresponding recesses 41 may be staggered so that the resulting sockets 39 will fall alternately in two transversely spaced planes as shown in Fig. 6.

- The rims 4i)V intended to'be operated upon are preliminarily shaped as by rolling, to a desired cross section, such as that shown in Fig. 6, the

central portion of the rim, of course, being flat,V

that is without the sockets 39; and my improved machine is arranged automatically to actuate the dies 36 and 37 in proper timed relation to chuck the rim, form the sockets therein and thereafter to press the rims to the proper size and correct any minor distortion which may have resulted from the socketforming operation.

The outward chucking movement of the inner dies is accomplished in the initial forward movement of the table by coacting cams 50 and 51 as herein described, and thereafter inward movement of the outer dies occursV to shape the rim. Such inward movement of the outer dies 37 is preferably obtained by kmeans of a plurality of toggle links 42 one of which is interposed between each of the die blocks 31 and a stationary abutment frame in the form for a ring 43 supported on the forward ends of the arms l2 of the main frame, As shown in Figs. 1 and 2, each toggle link 42 bears at its opposite ends on trunnions 44 and 45, the former being mounted in an outer bearing member 46 within the ring 43, and the `latter being mounted in the outer die 4locks 31. The toggle links are held in position by side links 47 connecting the ends of the opposed trunnions. By this construction the toggle mechanism is able to withstand tremendous pres sure and will serve to effect movements of the outer die blocks 31 in both directions.

It will be understood that in the forward stroke of the table by the power driven eccentrics, the togglelinks are moved from an inclined position (shown in Fig. 'il to a position substantially parallelV with the table (Fig. 2) and that in such movement the outer die blocks are moved radially inwardly However, before the outer dies reach the work performing portion of their strokes, the inner blocks must be moved radially outwardly to the position shown in Fig. 2 so as to engage with the rim interposed between the two are positioned so las to determine the true pre-- determined circumference of the rim when completed. g

To obtain such outward radial movement of the inner dies 36, the coacting cams 50 and 51 are employed. The former is in the form of an an nular abutment member positioned centrally with respect to the table 13 and adapted to be engaged by a plurality of cam shoes 51, one of which is mounted on each of the inner die blocks 30. The peripheral surface of the cam member 50, as shown in Fig. 5, is divided into a plurality of flat segments, one for each of the inner die blocks.` These segments each slope gradually from the front toward the rear of the machine and the cam member 5u is therefore of tapered form, as shown in Fig. 1, having a plurality of similar cam surfaces 52 formed by the segments.

Upon relative movement of the cam 50 and the table 13, the engagement of the cam shoes 51 with the inclined cam surfaces 52 will cause radial expansion of the inner dies 36, and to obtain such relative movement the forward movement of the table is preferably utilized. Thus, when radial expansion of the inner dies is desired, the cam member 50 is held stationary while the table 13 is moved forward. It will be apparent that during such forward movement of the table the outer dies 37 will be moved radially inwardly by the toggles 42 and when the outer dies come into yContact with theV work a greatinward force will be exerted upon the inner dies 36. This force produces great friction between the cam shoes 51 and the cam surfaces 52 and to avoid the necessity for excessively large, cumbersomeholding means for the cam member 50, means ispreferably provided for holding the cam stationary until .the innerdies have been expandedt'o the desired diameter :and arranged i'thereafter lto permit movement of the cam member 50 with the table 13. f

In the preferred embodiment illustrated in Figs. 1 to 4 this means is controlled and driven by the main shaft 20 of the machine and comprises a rod 53 detachably connected to the cam member 50 by means of a nut 54, and extending rearwardly and downwardly through the table 13 axially thereof. This rod 53 extends through and is slidably mounted .in the cross-bar 25 of the slide 14 and is connected at its rear end to a `slide 55 mounted in the cross-head 24, The wedge 26 being` between the cross-bar 25 and the cross-head 24,l is slotted at 26a to vpermit the rod 53 to extend therethrough. The slide 55 is mounted in the cross-head 24 for sliding movement, and at its rear end which projects out of the cross-head it carries a yoke 56 which surrounds a cam 57 mounted on thev main shaft 20 between the twoeccentrics19'(Figs. 1, 2 and'3).

In the rear `portion of the yoke 56 is a cam roller 58 adapted to bear `against the cam 57 in sucha manner that the-cam determines theforward extent of movement of the cam roller. The cam 57 has a dwellportion 59 which maintains the roller 58 against forward movement during the larger portion of the rotating movement of the shaft 2G.` At one side (Fig. l) the cam 57 has a relieved portion ,66 which permits forward movement of the cam roller 58 after the table has been moved forward a predetermined distance. l

While the cam member 50 isrheld stationary by k the rotating cam 57, the forward movement of the table 13 causes the inner dies36 to be expanded into chucking relation to the rim 40. Theu relieved portion of the cam is then brought into engagement with the cam roller 58, as shown in Fig. 2, whereby to permit forward movement of the cam member 56with the table Upon the return or rearward stroke ofA thev table 13 the toggle mechanism will withdrawl the outer `dies 37 Vto the positions shown in Fig. l and as the cam. shoes 51 move rearwardly along the converging cam surfaces 52 the springs 33 will force the dies 36 inwardly' to the positions shown in Fig. 1 sothat the finished rim may be withdrawn and a new rim putin place within the two sets of dies. During the retracting movement of the table the dwell ysurface 59 of the cam 57 will again be brought into operative relation with the roller 58 and the cam 50 will be retracted from the position `shown inl Fig. 2't0 its initial position shown in Fig. 1.`

It will be seen that the outside diameter of the inner or expanding dies 36 may be readily changed, within. certain limits determined by the width' of the dies, by substitution of a new cam 50, and that the inside diameter of the outer or compressing dies 37 may be changed by adjustment of the wedge 26 bymeans of the screw device 2'7. The screw device 27 may also be used to determine the amount of compression to be applied to the rims.

In Figs. '7, 8 and 9 of the drawings an alternative embodiment of the invention is illustrated.-

In this machine theV frame, lthe table construction and the mounting of the die blocks-are generally Vsimilar to. that lshown in Figs. 12, and 5 and these parts bear the4 same reference numerals as in those'gures. The principaldiierences of construction are found in the actuating means for theinner' dies 36, the cam member 5Ga being first portion of the forward movement ofY the table and thereafter released for movement with the table by means which isgoverned .by the longitudinal movement of the table rather than by rotativef'movementA of the shaft 20 as in the other embodiment.

The cam member 50a is mounted on a rod 53a which extends rearwardly and downwardly through the table 13 axially thereof andis jour'- nalled slidablyvatits rear end in a bearing sleeve 54a mounted in the cross-bar 25 of the slide 14. Forwardly of the cross-bar 25 the rod 53EL carries aradially projecting .collar 6l)a whichis fixed against longitudinal movement relativelyto the rodV 53a.

.To hold the rod 53L against longitudinal'move- Yment the collar 60a is engaged by a detent 61 which in the present case is in the form of an arm pivoted upon a horizontal axis at 62 `onthe inclined portion 1.1 of the frame above the slideway 15. VAt its pivoted end the arm 61 is bifurcated as shown inFig. 9 so as to extend around the adjusting device2'7 of the wedge 26. The forward end of the arm'l is provided in its lower surface with a notch 63 adapted to slip. over the collar 60a to hold the rod.53av againstmovement. When the notch 63 in the arm engages the collar 60e, and the/.table 13 is in its retracted position as shownin Fig. 8, a cross-bar 64 extending between the two bars 17 engages a flat upper surface 65` onthe arm 61 and maintains the arm in operative relation to the rod 53a.

.1 As the table 13 is moved forward in the operation of the machine the bar 64' moves forwardly along the surface 65 of the-arm and after it has passed beyond the .rounded forward edge of the js'urface65 the arm 61 .may move upwardly to its inoperative position shown in Fig. '7, whereinr `the notch 63sis disengaged from the collar`60\ and the rod53a is the table 13. 4 rl Duringsuch forward movementv of the table and prior to the release of the detent arm61, the cam shoes 51 are moved upwardly along the infree to `move-forwardly with clined surfaces 52a of the cam 50a (which is now f stationary) until the inner dies 36 are in the desired chucking relation to the rim.' After the bar 64 has moved to its inoperative position shown in Fig. 7, the friction between the cam shoes 51 andthe cam50a serves to lpull the rod 532L for- 37. During the final forward movement of the` table all strain on the actuating-mechanism of the inner dies is avoided since the cam Lmember isoa moves with the cam shoes 51 'during this period. I i.,

When the movement of the table 13 is reversed the inward pressurepf4 the springs 33 will cause suliicient friction between the cam shoes 51 and the cam 50 to move the cam and the rod 53u rearwardly from the position shown in Fig. 7 to the position shown in Fig. 8. When the collai` a comes into registry with the notch A63, `the arm 61 will drop downwardly and the rear face of the notch 63 Vwill limit the rearward movement of the rod 53a. As the rearward movement of the `table continues the cross-bar 64 will move over and into engagement with the surface 65 on the detent and will thus hold the detent in its operative position.

The machine herein described is unusually simple and eiiicient since it utilizes simple cam means for determining the diameter of the expanding dies 36 and for moving them toand maintaining them at this diameter, while elicient and powerful means in the form of toggle links are used for actuating the outer dies through their work-performing movements. The novel control means for the cam 50 insures proper operation thereof and yet avoids all possibility of breaking oi the machine dueto the application of undue force upon-the cam and its supporting means. Since the inner dies act principally to back up the rim while the outer dies perform substantially all ofthe work, the efficiency of the machine will be obvious.

While I have herein described the machine as being adapted for sizing rims and forming outwardly facing sockets therein, it is to be understood that the invention is not limited to the performance of these operationsonly, it being obvious thatother operations such as punching Y holes in the rim as desired may beperformed.

This application forms a continuation in part of my copending applicationSerial No. 414,290, filed December 16, 1929.

I claim as my'invention:

1. A machine of the character described comprising a stationary frame, a movable frame car-` vof the otherV set and said other frame and operable upon continued movement of said movable frame in said given direction to move the blocks of said other set toward and into operative relation to said .first set to `press an annular article positioned therebetween to theV diameter determined by said rst set of die blocks.

described, the combination of a frame having a central abutment, an outer annular abutment spaced radi.ally from the central abutment, a

support movable axially relative to said abutments, two sets of dies mounted on said support for relative radial movement and adapted to receive between them an annular piece of work, means for reciprocating the support, cam means operating as an incident to the movement of the support in one direction to impart radial movew 2. In a metal working machine of the classA the support in the same direction to impart radial movements to the other set of dies.

3. In a metal working machine of the class described, the combination of a central abutment, a stationary frame member constituting a second abutment spaced radially from the central abutment7 a support movable axially rela-- tive to `said abutments, an inner set of diecarrying blocks arranged in circular series on said support and movable radially thereof, an outer set of radially movable die-carrying blocks also mounted on said support for radial movement, said central abutment and said inner blocks having coacting cam surfaces operable in the movement of the support to move said blocks radially to position and hold an annular piece of work encircling the blocks, and toggle means operable in the movement ofthe support and acting between said outer abutment and the outer series of blocks to Vcause the latter to move radially inwardly to shape and size the work.

4. A metal working machine of the class de scribed, comprising a reciprocable support, two setsof die blocks `mounted on said support for radial movement and for movement relative to each other, said two sets of dies being adapted to receivebetween them an annular piece of work to be operated upon, and actuating means for said dies including a cam means for one set of dies and a toggle means for the other set of dies.

5. A metal working machine of the class described, comprising a reciprocable support, two sets of die blocks mounted on said support for radial movement and for movement'relative to each other, said two sets of dies being adapted to receive between them an annular piece oi work to be operated upon, actuating means for said dies including a cam means for the inner set of dies and a toggle means for the outer dies, said cam and toggle means being operable to compress the work between the dies, and a single means for actuating said cam and toggle means successively.

6. A rim forming and sizing machine comprising a lframe and a table mounted for movement relatively to each other, two annularly arranged sets of forming dies mountedon said table for radial movement toward and from each other, the outer set of dies Yhaving bosses thereon arranged to form outwardly facing sockets in a metallic rim compressed between the two sets of dies, the inner set of dies having recesses therein to permit the formation of. such sockets, cam means acting between said frame and the inner dies and operable during the first portion of a relative movement of the frame and table in a given direction to move saidinner dies outwardly to a given diameter, and toggle links between said frame and said outer dies Vand operable uponV continued relative movement of said frame and table in said given direction to force the bosses on said outer dies into a rim positionedbetween the two sets of dies.

7. A machine of the character described comprising a stationary frame, a movable frame carried thereby, two annularly arranged sets of opposed die blocks mounted on one of said frames for radial movement toward and away from each other, the die blocks vof one set having bosses formed thereon, and the die blocks of the other set having recesses therein to receive said bosses, cam means acting between said recessed die blocks and the other one of said frames operable upon movement of said movable frame in a iirst direction to move said` recessed die fblocks toward the other die blocks to a given diameter, and toggle means acting between said other frame and said other die blocksV operable by continued movement of said movable framein said irst direction tomove said other die blocks toward and into operativefrelation withsaid recessed die blocks.

8. A metal working machine of the class described comprising a frame having an annular stationary ring and a central post, said ring being spaced outwardly from the post, a cam member secured to said post substantially in theY plane of the ring, a table guided for reciprocation longitudinally of said post, an innerset oi dies arranged in circular series rabout said ,cam member, an outer set of dies arranged'm circular series about the inner set of dies, said tworsets of dies being adapted to receive between them an annular piece of work tobe operated upon and being movable radially relative to each other, toggle links interposed between the outer dies and said stationary frame member, said inner dies having cam surfaces coacting with said cam member and operable in the movement of said table in one vdirection to move the inner dies outwardly, and said toggle links being subsequently operated in the same movement of the table to move the outer dies inwardly..y

9. A metal working machine. of rthefclass described comprising a stationary frame ymember and a central pos t,'a tableguidedfor reciprocation longitudinallyof rsaid-post anfinner set of diesarranged in circular series on said table, an outer set of dies arranged in circular series about the inner set of dies, said two sets of dies being adapted to receive between `themw-an annular piece of work tobe Voperated upon, and being movable radially` relative to -leach` other, toggle links interposed between tlie'outerdies and-said stationary .frame member, 'cam' means operable in the movement" ofv saidtable infone direction to move the inner dies'outwardly, said toggle links being subsequently operated in the. same 4movement of the Vtable tomovev the outer dies in-v wardly, and means for varying the time of operation of the cam means relative to ythe toggle means;

Vranged to form sockets in a` metallicrim compressed between the'two sets ofdies and the inner set of dies having recesses Ytherein to' permit the formation of said sockets, a cam member mounted in said frame adapted inlmovement'of the table in'one direction relatively to the cam to move said dies outwardly, means for moving said table in said direction, means to restrain said cam member against movementin said direction during the liirst part of the table movement and thereafter to permit movementoi said cam member with said table, and togglev links acting between said irame and said outer dies during continued movement or said tableto `force said bosses on said outer dies into a rim positioned between the two sets of dies.

11. 1n a metal working machine, the combination of a frame and a table mounted for relative movement a set of inner dies and a set of outer dies, each set bemggmounted onsaid table'for radial sliding movement of the dies, toggle linksinterposed between the frame and said outer dies operable upon relative movement of the table and the frame in one direction to move said outer dies inwardly, a. cam member mounted centrally of said table and operableupon relative movement` of said table and said cam member in said direction to expand said inner dies, vand means operable to hold said cam member stationary relatively to said frame during relative movement of said table and said frame in said direction whereby to cause expanding movement of said inner dies, said lastmentioned means being operable at a predetermined point in suoli relative movement oi the table and the frame to release said cammember to permit said member to remain in xed relation with respect to said table.

l2. A machine ofthe character described comprising a frame, a table mounted inv said frame for movement perpendicular to the plane of the' table, a set-of inner` dies and a set of outerdies mounted on said table for radial movement toward and from each other, toggle links interposed between said frame and the outer dies and operable to move said outer diesv inwardly upon movement of said table in one direction, acam member mounted centrally with respect to said table and arranged when said table moves past said member in said direction to act upon said inner dies to move the same outwardly, Vactuatingmeans mounted on said frame for moving said table, and means operating in timed relation to said actuating means and operable to maintain said cam member `stationary during initial movement of said table in said direction and after a predetermined movement of the table in said direction to permit` movement of said member with the table.

13. A machine for operating upon annular arti-Y cles, said machine comprising Ya frame, a `table ymovably mounted on said frame, a pairroi inner trally of the'table and operable upon movement relatively to` the table in one direction axiallyk of the dies to expand said inner dies, means interposed betweensaid frame and said outer dies and operable upon relative movement of the table and the frame to contract said outer. dies, means operable to cause such relative movement of the frame and the table to contract the outer dies,l `and means operable to cause relativemovement of said table and said cam member to expand icc said inner dies to a predetermined diameter to f -opposed relation for radial movement toward and from each other, means interposed 'between said frame and the outer dies operable vupon movement vof the table in one direction to move said outer dies inwardly, a cam member mounted centrally with respect' to said table and arrangedwhen saidtable moves past said cam member in said 'direction to move said inner dies outwardly,

vactuating means for said table, and a cam "operatively' connected Ato said cam member and roperable' during the first portion of' the table movement in' said direction to maintain saidfcam memberstationary and thereafter to permit said cam member to move with said table in said direction.

lliflmetal working machine comprising, in combination, a frame and a table mounted for relative movement, an annular set of inner dies and an annular set of outer dies mounted on said tablevin opposed relation for radial sliding movement of the dies on the table, means interposed between the frame and said outer dies operable upon relative movement of the table and the frame in one direction to move said outer dies inwardly, a cam member mounted centrally of said table and operable upon relative movement of said member and said table in said direction to expand said inner dies, a rotatable shaft operable in its rotation to cause relative movement of the table and the frame, a cam mounted on said shaft for rotation therewith, and a cam follower engaging said cam and connected to said cam member, said rotating cam having a dwell surface arranged to maintain said cam member stationary withvrespect to said frame during the initial portion of the relative movement of the frame and the table in said direction, said cam also having a relieved portion arranged to permit relativelmovement of the cam member and said frame during a portion of the relative movement of the table and the frame.

16. A metal working machine comprising, in

combination a frame, a table mounted on said frame for movement perpendicularly with respect to the plane of the table, an annularly arranged set of innerdies and an annularly arranged set of outer dies mounted on the table in opposed relation for radial movement of the dies, means interposed between the frame and the outer dies operable upon movement of said table in one direction to move said outer dies inwardly, a cam member disposed centrally of said table and operable upon relative movement of said cam member and said table in said direction to move said inner dies outwardly, a rotating shaft operably connected to said table to vreciprocate the sameVa cam Vmounted on saidv shaft and a follower connected to said cam member and engaging said rotating cam to limit the 'movement oi said cam member in said direction, said rotating cam having a ydwell `surface arranged to maintain said cam member stationary during the rst portion of the movement of the table in said direction and also having a relievedl portion to vpermit movement of' said Vcam member with said table during further movement of said table in said direction, said cam :being operable upon continuedrotation of said shaft to return saidA cam member to its initial position.

171A metal working machine comprising, in combination, a frame, a table mounted on said frameifor movement perpendicular to the plane of the table, annularly arranged sets of inner and outer dies mounted on said table in opposed relationv for radial movement of thev dies, means interposed between the frame and said outer dies operable upon movement of said table in one direction to move said outer dies inwardly,means for reciprocating said table, `and means for eX- panding said-inner dies comprising a cam member positioned centrally of said table and operableupon-relative movement of said table and said cam member in said direction to expand said innerdies, a rod connected to said cam member and extending slidably through said table axially thereof, a lever arm mounted on vsaid frame,

` interengageable means on thefree end of said arm and on said rod operable when engaged to fix said rod against longitudinal movement relative to said frame, and means moving with said table operable to engage said arm adjacent its free end to maintain said arm in operative engagement with said rod during a predetermined range of movement of said table.

18. In a metal working machine, the combination of a frame and a table mounted for relative movement, a set of inner dies and a set of outer dies, each set being mounted on said table for radial sliding movement ofthe dies, toggle `links interposed between the frame and said outer dies operable upon relative movement of the table and the frame in one direction to move said outer dies inwardly, acam member mounted centrally of said table and operable upon relative movement of said table and said cam member in said direction to expand said inner dies, a detent mounted on said frame operable to hold said cam member stationary with respect .to said frame during 'relative movement of said frame and table in said direction, and means mounted in fixed relation to said table and operable to hold said detent iny its operative position during a portion of such relative movement of the `frame and table and then to release said detent to permit the cam member to remain in Xed relation to said tablel during continued relative movement of the frame and the table.

x19. A machine ofthecharacter described comprising a frame, a table mounted in said frame for movement perpendicular to the plane` of the table, a set of inner dies and a set of outer dies mounted on said table for radial movement toward and from each other, toggle links interposed between said frame and theiouter dies and operable to move saidiouter dies inwardly upon ymovement of said-table in Yone direction, a cam member mounted centrally with respect to said table and arranged when saidv table moves past said member in said Vdirectionto act upon said inner dies to move the lsame outwardly, actuating means mounted on said frame for moving said table, and a detentlmounted on said frame operable to maintain said cam member stationary during a predetermined .movement of the table.

20. ,A machine of the character described comprising a frame, a table mounted in said frame for movement .perpendicular to the plane of the table, a set of inner dies and a set of outer dies mounted on said table for radial movement toward and from each other, toggle links interposed between said frame and the outer dies and operable to move said outer dies inwardly vupon movement of said table in one direction, .a cam member mounted centrally with-respect to said table and arranged whensaid table moves past said member in said direction to act upon said inner dies to move the `same outwardly,- actuating means mounted on said frame for moving said table, a detent mounted on said frame and operable to hold said cam member against movement, and means mounted in fixed relation to said table andoperable to maintain said detent Vin its operative position during a predetermined range of movementof the table.`

l 21. A machine of the character described comprising a frame, a table mounted in said frame for movement perpendicular to the plane of the table, a set `of'inner dies and a set of outer dies mounted on said table for radial movement toward and from each other, toggle links interposed between said frame and the outer dies and operable to move said outer dies inwardly upon movement of said table in one direction, a cam means mounted on said frame for moving said table, a detent mounted on said frame and op` erable to hold said cam against movement, and means acting in timed relation to the movement of the table to control the operation of said detent.

22. In a metal Working machine having a rst die movable into hacking-up relation to a Work piece, a second die movable toward saidrst die to perform Work upon a Work piece backed-up by said first die, an actuating cam for` moving said rst die to. its operative position, actuating means for said second die, and means for driving said actuating means operable to effect relative movement of said cam and said first die until said rst die is in its operative position and then to terminate such relative movement, said driving means being operable after termination of such relative movement to move said second die through the work performing portion of its stroke. Y Y l 23. Inra metal Working machine ofthe character set forth, the combination of a table having twosets of dies arranged in circular series on the table and adapted to receive between them an annular piece of Work, and actuating means for each set of dies, and a power driven mechanism for said actuating means operable to effect rst the operation of the inner dies into holding relation with the Work and then the` operation of the outer dies into engagement with the Work, the actuating means for the inner dies including coacting cams moved relative to each other to effect the operation of the inner dies and held against relative movement during the operation of the outer dies. i

t CARL C. GROTNES.

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