US1113526A - Machine for hammering metal packing-rings. - Google Patents

Description

41W; WE'NZEI MACHINE FOR'HAMMERING METAL PACKING RINGS.

AxPLIGATIO N FILED JULY 11, 1913.

' PatentedIOt. 13, 1914'.

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A mun/T01?! Wm-M ATTORNEY.

A. W. WENZEL.

MACHINE FOR HAMMERING METAL PACKING-RINGS.

APPLICATION FILED JULY 11, 1913.

I Patented 0@1;.13,1914.

4 HEETSSHEET 2.

WITNESSES! INVENTOR.

ATTORNEY.

I A. w. WENZEL. MACHINE FOB. HAMM ERING METAL PACKING RINGS. APPLICATION FILED JULY 11I 1913.

11,113,526. I Patented 001.13,1914. 4 SHEETSSHEET 3.

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35/ 74 30 3: J n q m I m Z 1; E 5 :31 35 ,1

WITNESSES E Aim-M 0 lama/15y.

, A. W. WENZEL.

MACHINE FOR HAMMEEING METAL PACKING RINGS.

APPLICATION FILED JULY 11, 1913.

. Patented 001.13, 1914.

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Application filed ul 11, 1913 Serial No. 778,463.

in the county of Essex and State. of New Jersey, have invented certain Improvements in Machines for Hammer ng. Metal Packing-Rings, of which the following is a specification.

The objects of this invent on are to prO- vide" a machine for hammering packing rings withblows of substantially equal nl tensityorforce but located at unequal intervals. along, the. ring; to enable'such hammering to be' done automatmally; tosecure, a simple, compact and durable machine; to provide a machine can be adapted to hammer a plurality of rings at one and the same time; to enable thejniachme to be adjusted'to vary the hammering or to hammer rings of different sites; to'secure accuracy of hammering and thus uniformity of tension in the rings, and .to obtain other advantages. and results as may be brought out in the following description. I

Referring. to the accompanying drawings, in which like numerals of reference indicate the same parts throughout'the several figures, igure 1 is a side elevation of. a. machine embodying my. invention, with the near side of the casing removed and showing the position of the parts whena'rmg is half hammered; Fig. 2 is a vertical crosssectional view on the broken line AA of Fig. 1, looking in the direction of the ar rows; Fig. 3 is a plan view of themachlne as shown in Fig. 1; Fig. 4 is an end eleva tion thereof as viewed from the right-hand end of Fig. 3; Fig'. 5' is a detail perspec-- tive view of a certain expansion cam Fig. 6 is a horizontal sectional view on line B-B of Fig. 1, looking down; Fig. 7 is a detail section, at right angles to that shown in Fig. 6, of a certain yoke for adjusting the wedges of the expansion cam; Fig. 8 is a vertical sectional view centrally and longitudinally of the machine through the packing ring holder and the hammer; Fig. 9 is a detail perspective View of the nut for clamping the packing ring in its holder; F 10 is a plan view of a double form of machine; Fig. 11 is an end elevation of the same, and Fig. 12 is a detail side view of, a modified form of packing ring holder.

In the specificembodiment of the in'ven tion illustrated in said drawings, and more especially in Figs. 1 to 9 thereof, the refer: ence numeral 1 indicates a base for the machine having at one eiidof itself a pedestal 2 of any desired or convenient form. This pedestal 2 supports a pair of parallel posts or guit es 3, 3 projecting vertically upward therefrom in a plane transverse to the length of the machine, see Fig. 4, said posts 3, 3 slidably supporting a hammer 4 between them. An extension 5' projects horizontally from this hammer toward the opposite end of the machine and carries a die or punch 6 on its under side near its extremity adapted to strike the desiredblow upon the packing ring to be hammered. Also supported by the pedestal 2 is an upright transverse head'- plate? arranged parallel to the two posts 3, 3 and spaced therefrom at the inner side of the pedestal from which the extension 5 of the hammer 4 projehts. Said head-plate 7 is provided with an opening forming an annular interior-seat 8 rotatably carrying a circular holder, 9 for packing rings to be ha1n mered. In order to retain this holder 9 upon the annular seat 8 provided therefor, projecting flanges 10, 10 are formed preferably v integral with the ring holder, and adapted to laterally engage opposite sides of the headplate 7 adjacent the annular seat 8, it being obvious that when the flanges are formed integrally with the ring holder, the head plate is transversely split, and after the insertion of the ring holder may be reunited in any suitable manner. This arrangement 9f parts admits, therefore, rotary movement of the jr'ingll'iolder 9 in a vertical plane parallel to the posts 3, 3, and in order to provide means for producing intermittent or stepby-step rotation of the holder, as hereinafter merc fully ex lained, theouter or circumferential sur ace of one or both of the flanges 10, lOfof the holder is notched or provided with ratchet teeth 11 to cooperate with a pawl 12, see Fig. 4.

The revolving ring holder 9 is provided with an aperture 13 axially coincident therewith, the aperture being the size of the largest packing ring it is desired to hammer. The end portion 14 of this aperture 13 toward the hammer 4 is smaller in diameter than the rest of the aperture, and provides, therefore, a shoulder 15 against which the packing ring may be clamped. The means herein shown for so clamp ng the ring is an annular nut 16, see F gs. 8 and 9, adapted -Specificatio n of Letters Patent. Patented ct.1l3,il9hl4t.

to screw into the larger .end of the aperture 13 and preferably beinghollow as at 17 to enable the operator to observe the ring, when held thereby, from his usual position at one'side of the-machine, facing toward the head-plate'l, For screwing this nut 16 into place, I secure diametrically across its outer face a bar 18 to which a wrench may readily be applied. Preferably segmental portions of the threads of the nut 16 are removed longitudinally of the nut, at 19, as are also similar portions of the threads within the aperture 13 of the holder, so that the threaded portions 20 of the nut may enter through the depressions caused by the removal of the threads in the aperture and vice-versa, see Fig. 8. In this way, the clamping nut may be brought uickly to bear against a packing ring within the aperture of the holder and then given a suflicient twist to clamp the same in place by the engagement of the segmental portions of threads on the two parts.

' When it is desired to hammer a packing ring of less diameter than the aperture 13, I employ a female mandrel 21 adapted to fit against the shoulder 15 of said aperture, as a large packing ring, would, see Fig. 8. Said mandrel is recessed to receive the smaller sized ring 22 and provides a retaining shoulder 23 corresponding to the'shoulder 15 of the carrier or head 9. A suitable -washer"2'4 placed between the ring 22 and an interior shoulder of the clamping nut 16 enables the ring 22 to befirmly clamped in place.

It is to be understood that the extension 5 of the hammer 4. protrudes into the aperture ,l3 of the ring holder through its smaller end "14, and the die or punch 6 is positioned to strike the inner cylindrical surface of the ring as the hammer falls in its slide-way.

-In order to raise the hammer, a cam-actuated rod 25 extends .vertically upward be- L tween the posts 3, 3 and is held in an appropriate socket in the hammer 4 by means of a set screyv 26. A screw 27 introduced into the upper side'of the hammer in alinement with the rod 25 and having a lock nut, provides means to adjust the position of the hammer upon the rod to correspond with the height of the surface to be hammered. To augment the lowering force of gravity. upon the hammer, I have shown a vertically disposed spring 28 under compression between the hammer and a top piece 29 securing the posts 3, 3 together at their upper ends. I have shown a cam 30 turning in a vertical plane transversely to the machine at the lower part of the pedestal 2 and providing at its periphery a spiral surface 31. for engaging the lower end of the rod 25 to raise the same to its maximum height, at which point the spiral engagin surface 31 abruptly ends, as at 32, to allow free drop of the rod. Thiscam is carried by a shaft 33 extending longitudinally through the ma-' chine and projecting from the opposite end thereof, where it carries a normally loose driving belt pulley 34 adapted to be made rotatively fast with respect to said shaft 33 by means of a clutch 35 of any suitable and well-known construction. It will of course be understood that a belt (not shown) is continuously driving said pulley 34 from any suitable source of power and that the machine parts remain stationary except at such times as the clutch 35 is thrown into operation manuall to operate said parts, as

will be hereina terjmore fully described. The blows thusproduced by the operation of the hammer are of substantially equal intensity, and according to my invention they are distributed around the circumference of the ring unequally, that is, near the ends of the ring the blows are'spaced a maximum distance apart, whereas diametrically opposite the ends of "the ring the blows are closest together. In order to obtain this unequal spacing of blows, the ring holder 9 is given rotary movements of varying amounts between successive blows, the first of which for each ring is preferablystruck at the proper distance from one end of the ring and the ring rotated so that the last blow is the same distance from the other end of the v ring. By this disposition of the blows, an equal or uniform tension is obtained in the ring.

he pawl 12 for turning the rotary holder 9 carrying the packing ring is, as clearly shown in Figs. 1 and 4, mounted upon the upperend of a rod 36 which slides non-rotatably in guides 60 on the pedestal 2. and projects at its lower end through the forked end of a horizontally disposed lever 37 adapted to transmit upward movements to the rod 36 through a pin 38 resting upon the upper surfaces of said forked end and passing through the rod. Other equivalent means, could, however, be used to effect the same result. To swing this lever 37 in a vertical plane, to raise the rod 36 varied amounts, I employ an expansion cam 39 shown in detail in Fig. 5, (see also Figs. 1 and 2), for depressing said lever upon the opposite side of its fulcrumal support from the said pawl rod 36. This expansion cam 39 is made fast upon a shaft 40 journaled above the cam shaft 33, by any suitable means such as set screws 41, 41. Segmental cam shoes 42, 43 are pivoted as at 44, 45 to diametrically oppositepoints of the body portion 46of the expansion cam 39 to swing in the plane of said cam, or perpendicular to the shaft 40, and the free ends 47, 48 of said shoes are directed in the same direction around the shaft- 33, that is to say, as the ex pansion cam rotates, the hinged end of one shat-2e instance shoe 43, will pass the fixed point followed by its free end 48, and so on. The free ends 47 and 48 of the said cam shoes,

are each held normally toward the center of the cam 39 by means of pairs of springs 49, 50 connected to the sides of the shoes and to the sides of the hub of the cam. For forcing said free ends 47, 48 outward from their normal inward position, however, I provide for each of said cam shoes 42, 43 a plunger 51 extending radially outward through the hub andabutting the'inner surface of the shoe near its free end as shown in Figs. 2and 5. Evidently by operating these plungers radially outward, the expansion cam becomes larger or expanded, and reduces in size as the plungers retract toward the center. By properly operating the plungers out and in, and causing the cam shoes 42, 43, to operate upon the lever 37, the same may be depressed varied amounts at different revolutions of the cam. As the expansion cam 39 rotates-in a plane perpendicular to the lever 37 in the particular ar-' rangemcnt of parts disclosed in the draw ings, and as considerable side thrust would result if said cam operated directly upon the lever 37, I interpose a treadle'52 hinged to the base 1 as at 53and extending transversely across the same beneath the expan sion cam 39 in its plane of rotation, see Fig. 2. This treadle is furthermore bent upwardly toward thecam 39 so as to be engaged near its free end by the cam shoes 42, 43 as they rotate, and said free end of the treadle rests upon the end of a vertical adjusting screw 54 inserted in the'top of the lever 37 near its end. Hence,- as the expan-' sion cam 39 rotates, its shoes 42, 43 strike swiping blows upon the treadle 52 which transmits its depression through the adjust ing screw 54 to the lever 37.

In order to vary the fulcrunial support longitudinally of thelever 37 so that greater or less angular movement of the rotary ring holder 9 may be made at each cam stroke, the said lever 37 is provided with a horizontal transverse slot 55 through which may be inserted a bolt 56 passing into a similar slot in supporting bracket 57 see Figs. 3 and 6. Obviously by shifting the bolt within the slots a varied ratio of leverage will be obtained in the lever 37 so that a given depression by the cam shoes 42, 43 will result in a greater or less elevation of the opposite end of the lever. Disks 58, 58 are prefer ably interposed between the lever 37 audits bracket 57 upon the bolt 56, and made fast at the adjusted position thereof, one of said disks being held to the lever as by screws 59,

and the other being similarly held to the bracket 57. By this means the lever is prevented itrom wabbling and is also provided with 'sufiicient friction in'swinging so as to overcome momentum tending to swing the lever farther than actually swungby the expansion cam. For returning the lever to horizontal position after a stroke, I insert upon the pawl rod 36. below'the upper guide 60 therefor seeFigs. l and 4, a spring 61 prevented i guide and bearing downwardly upon a collar 62'secured to the pawl rod, whereby the spring exerts a retractive pressure upon the rod 36 and lever 37 when the latter is swung.

0 prevent swinging the lever too far, however, a spring 63 is attached at the end of the lever adjacent the expansion cam to exert a counter force to the-spring 61 on the pawl rod. Y 1

In order to shift the' plunger- s 51, 51

roin upward movement by said radially outward of the expansive cam 39,

wedges 64, 64 are slidably mounted in longitudinal grooves in the shaft 40 in such a manner that the inner ends of the plungers rest upon the inclined outer edges of the Wedgesfsee Figs. 1, 2 and 6 The said wedges "are in the same plane with the plungers and operate in radial slots in the expansion camwhich-are in the same diametric plane with the plungers 51, 51. It is to be understood that the inner ends of the plungers 51.are always in contact with the inclined outer edges of the wedges, which are never shifted out of engagement therewith.

Obviously, as the radially wider parts of the Wedges st, 64 are caused to pass under the endsfof the plungers 51, 51, by sliding said wedges longitudinally o l 'the shaft 40, said plungers will be forced radially outward and consequently force the cam shoes 42, 43 outward against the resistance of their springs 49,50, and as the wedges are withdrawn in the opposite direction, thesprings 49, 50 will draw the cam shoes inward, keeping the plungers against the inclined edges of the wedges, as stated.

At both ends of the wedges 64, 64 collars 65, 66 surround the shaft 40, see Fig. 6, and

against one of these collars, for instance the collar 65 at the small end of the wedges, presses a helical spring 67 coiled around the shaft 40 and adapted to exert through the collar 65 a tendency upon the wedges to slide them in their respective grooves in the shaft 40 and withdraiuthein from the slots in the expansion cam. The wedge grooves in the shaft are joined at their ends adjacent the wide ends of the wedges into an opening extending transversely through the shaft,and into which I insert a U-,

shaped yoke69 the arms of which extend longitudinally of the shaft 40 in the wedgegrooves and press against the wedges 64, 64. The closed end of this yoke 69 lies transversely in the aperture 68 and its arms are surrounded by the collar 66, which retains the yoke against displacement. The en of the shaft 40 is centrally bored or hollowed out beyond the opening 68 for the reception of a sliding pin 7 which is adapted to be pushed inwardly of the shaft and press the yoke 69 against the wedges 6 1, 64, whereby the cam shoes 42, 43 may be spread apart. A cam 71 is employed to press said pin 70 inwardly of the shaft in this particular disclosure of the invention, although small gear 7 7 fast upon said shaft 33 driving a transmission gear 78 loose upon the erqiansion-camv shaft 40 and driving through a bevel gear .79 fast with respect to said transmission gear 78 a horizontally disposed bevel gear 80 upon a vertical shaft 81 supported from above by the bracket or frame portion 73; still further reduction of speed is effected by the use of a small gear 82 on this vertical shaft 81 meshing with a larger gear 83 on another vertical'shaft or stud carrying above the bracket-or frame portion 73 a bevel gear 84 to drive a corresponding beveled gear 85 on the upper shaft 74. Any other suitable transmission means might be substituted if desired, but howevertransmitted to it, I desire the speed of the horizontal eccentric or cam 71 to be one revolution for each revolution of the rotary ringholder 9.

It is desirable to have the operation of the machine entirely automatic during the hammering of each ring, and also to have the mechanisms automatically stopped when the ring is hammered around its entire circumference. To obtain this result, I arrange a handle or lever 86 at some position convenient to the operator, as for instance adjacent to the pedestal 2, which is pivotally supported, as at 87, and adapted to shift at its lower end a connecting rod 88, which in turn is adapted to operate through a horizontal lever 89, see Figs. 8 and 6, a vertical lever 9.0, see 1, for shifting the clutch 35.

Said lever 90 has upon its upper end a laterally projecting lug 91 which will enter a hole 92 in a disk 93 carried by the top shaft 74, when said hole is brought into position by turning of the disk. Said lug 9] will be withdrawn from the hole 92 in the disk 93 simultaneously with the throwing in of the clutch by the lever 86, and until the hole 92 again comes into registration with the lug,

the clutch is held operatively thrown in by the lug bearing against the solid portion of the disk 93. As soon, however, as the hole 92 and lug91 register, the lug enters said hole by virtue of the tension of a spring 9 L acting at some appropriate point upon the lever system, for example, as here-shown, drawing upon the clutch lever 89 below its pivotal support, and the clutch is thrown out and the machine stopped. The top shaft 74: is therefore preferably given one revolution for each complete turn of the rotary holder 9 carrying the packing ring being hammered, so that the machine operates automatically upon each ring and stops when it is completely hammered. The rendering of the machine automatic is further carried out by driving the expansion cam shaft 40 from the lower main shaft 33, whereby perfect synchronism of the expansion cam is maintained with respect to-the operation of the hammer and the two simultaneously stopped and started. For so drivin these shafts one from the other, a pair of intermeshing gears 95, 96 are secured one to each shaft.

It is found in practice that the momentum of the rotary ring holder 9, when given a rotative thrust by the pawl 12, rotates the said holder farther than the actual stroke of the pawl. I provide, therefore, a brake 97 to bear against the plane side surface of the holder and frictionally overcome the momentum so as to eliminate any such excess movement. This brake is shown in Figs. 1, 3 and 8, and is carried on a stem 98 sliding in a bracket 99 on the pedestal 2 and forced yieldingly toward the rotary ring holder 9 by a spring 100 interposed between the end of said stem and an adjusting screw 101 working in the opposite end of the slide way for said stem. The function of the spring is to exert sufficient pressure against the brake shoe to cause the proper friction to prevent excess movement of the revolving holder 9, but without undue friction so as to effect materially the efiiciency of the machine.

In'operation, the driving pulley 34: revolves continuously as has already been stated, and, after securing a packing ring to be hammered within the rotary holder 9 and rotating the same to a position such that the hammer will deliver its first blow at the proper distance from the end of the ring, the operator shifts the hand lever 88 to throw in the clutch 35 and release the lug 91 from the hole 92 in the disk 98 on the top shaft. The mechanisms are thus set in motion, and the lower shaft 33 is rotated at constant speed, so that the cam 30 raises the hammer at equal intervals of time. 'Shnultaneously with each upward movement or the hammer, one of the cam shoes or 1 exerts a downward pressure upon the trcadle 52 which actuates the lever 37 to raise the pawl 12 and give the ring holder a rotary' strokes of the pawl 12. Since the two ex pansion-cam shoes actuate the pawl twice during each single revolution of the cam for operating the hammer, it will be evidenti that the shaft 10 carrying the expansion cam; makes but one revolution to two revolutionsf of the shaft 33 carrying the cam for op-f erating the hammer. ,As the expansion cam 39 operates to give the pawl 12 its greatest.

stroke when the cam arms 42, 43 are swung outward to their greatest extent, the wedges I 64:, 64, are init1ally positioned in their grooves-with their larger ends in engage-- ment with the radial plungers 51, 51 and are automatically withdrawn gradually so that their smaller ends fire in engagement with the plungers when the hammer is acting on the rin diametrically opposite to theends of the ring; as the hammer continues to operateupon. the ring around to its end, the wedges 64, 64: return to their initial position in their grooves. To accomplish this, it is necessary only for the cam 71 for operating the wedges to revolve once to every revolution given the rotary holder 9 carryingthe piston ring. When the said ring holder 9 has completed its revolution, the hole 92 in the disk 93 on the top shaft 74L registers with the lug 91 on the clutch lever 90 so that the clutch is thrown out as described and the machine stopped. The operator then can remove the ring and insert another to be hammered in the same manner as just described. I

()bviously the number of expansion cams 39 may be changed without departing from the spirit and scope of the invention, as for instance only one might be employed instead of two, and other parts of the machine adjusted or changed in dimension to secure the same results. I

Preferably a casing 121 extends upward from the base 1 of the machine, even with l the top of the pedestal 2, and incloses the working parts described, as well as forming at its top a bench or work table for. the

' in the same plane and spaced a short distance apart. Theserevolving holders are operated simultaneously by a pair of pawls 10st, 105 preferably'upon the same rod-106,

and are provided with hammers/107, 108

operated respectively by cams'109, 110. The v cam 109, corresponding to the similar earn described with reference to the single form of machine disclosed in Figs; 1 to 9,. is mounted upon a main shaft 111 running through the machine and carrying the driving pulley 112. The other cam 110, for operating the hammer 108, is upon a counter shaft 113 operated from the'said main shaft 7 111 in any suitable manner, as by gears 114, 115' between which is interposed an idler 116. The pawl rod 106 is operated as before through a lever 117 and treadle 118 by an expansioncam, and the clutch 119 is operated by a hand lever 120. The main portion duplicated in the double machine is the pedestal and parts carried thereby, and obviously as '{m any" such portions or heads could be connected to a single machine mechanism as could have their rotary ring holders actuated from the expansion cam of the single machine mechanism. It should also be noted that while have shown a machine arranged to hammer the inner curved surface of a ring, my invention can be adapted to hammer the flat side edges, or either of them of a ring, as will be obvious to any one skilled in the art. Furthermore, instead of uniformly notching the peripheries of the I flanges 10, 10 of the ring holder, 9 with ratchet teeth, as shown, I could if preferred form teeth 121 of unequal size or lengths circumferentially o-fthe holder -122,'as shown in Fig. 12, adapted to be engaged by the pawl at the ends of its down strokes. In other words, teeth could be arranged at varying distances apart,-around the holder, corresponding to the different distances the holder is to be turned for the successive blows of the hammer. Such teeth would be distributed properly around the entire circumference of the holder, so es to always start with the holder in the same position. The chief advantage wouldabe that drag of the pawl over intervening or idle teeth would be eliminated.

Various other modifications can be made without departing from the spirit and scope of the invention, and l desire to be understood as not limiting myself except as the following claims may require.

Having'thus described the invention, what I claim is 1. In a machine of the character described, a ring holder, a hammering member adapted to operate along the circumference of the ring, and means for imparting to the ring holder a predetermined varyin feed "with respect to said hammering mem er..

2. In a machine of the character described, a ring holder, a hammering memberada-pted Q to operate along the circumference of the i as to operate along the circumference of the ring, means for producing a relative feed between the ring and the hammering mem- I.

ber, and means for predeterminedly varying said relative feed between the ring and hamtwen the ring and the member.

4. In a machine of the character described, a ring holder, a hammering member adapted to operate along the circumference of the ring, means for producing a relative feed between the ring and the hammering member, a tripping cam for actuating the feeding mechanism, a controlling cam, and means whereby the controlling cam predeterminedly varies the actuation of the'feed mechanism by the tripping cam.

5. In a machine of the character described, a ring holder, a hammering member. adapted ring,.mech'anism for producing relative feed between the ring and the hammering member,- a tripping cam for actuating said feeding mechanism, a rotatable controlling cam connected with the ring holder, and connections between saidv controlling cam and the tripping cam whereby adjustment of said tripping cam is produced to predeterminedly vary the relative feed between the ring and hammering member.

6.In a machine of the character described, a ring holder, a hammer reciprocable in right lines in the plane of said holder, mechanism for producing relative feed between the ring and the hammer, a cam, and means for operating the cam for predeterminedly varying the saidrelative feed-between the ring and the hammer.

7. In 'a machine of the character described, a ring holder, means for rotating the ring holder to feed the ring, a hammer, means ,.f or actuating the same, and connections between said actuating means and means for rotating the ring holder whereby the feed of the ring is varied in predetermined manner with respect to the hammcring.

8. In a machine of the character de scribed, the combination of a ring holder, means for rotating sail holder, in its plane with a varying step-by-step motion, and

means for hammering said ring as it is so rotated.

9. In a machine of the character described, a ring holder, a hammering member, means for actuating said hammering member uniformly, and means for feeding the ring bya varying movement with respect to. said hammering member.

10. In a machine of the character described, the combination of a ring holder, a hammering member, a shaft having means for actuating said hammering member, means connected to said shaft for rotating said ring holder in its plane, a clutch for starting and stopping said shaft, and means for automatically throwing out said clutch when the ring has made a-complete rotation.

11. In a machine of the character described, a ring holder, a hammering member, a pawl for rotating said ring holder, a lever for reciprocating said pawl, a rotary expansion cam for intermittently engaging said lever, and means for predeterminedly expanding and contracting said cam to vary the feed of the ring.

12. In a machine of the character described, a ring holder, a hammering mem-' ber adapted-- to operate along the circumference of a ring in said holder, a pawl.

for turning said holder, a lever for operating said pawl, means for adjusting the fulcrum of said lever to vary the stroke of the pawl and means for intermittently tripping said lever with a predetermined varying stroke.

13. In a machine of the character described, a ring holder,-a hammering member adapted to operate along the circumference of a ring in said holder, a pawl for rotating said holder, a lever connected to said pawl, means for adjusting the fulcrum of said'lever, an expansion cam for tripping said lever, and means for automatically expanding and contracting said cam.

14:. In a machine of the character described, a ring holder, a hammering member adapted to operate along the circumference of a ring in said holder, a pawl for rotating said holder, and means for imparting to said pawl a predeterminedly varying stroke.

15. In a machine of the character described, a ring holder, a hammering member, a lever arranged and adapted to rotate said ring holder, an expansion cam adapted to trip said lever, a wedge for expanding said cam, and a controlling cam for moving said wedge.

16. In a machine of the character described, a ring holder, a hammering member, a lever arranged and adapted to rotate said ring holder, an expansion cam adapted to trip said lever, a wedge for expanding said cam, a spring normally holding said wedge in one position, and a controlling cam for moving said wedge into its other posifor resiliently holding said shoes contracted, Wedges for expanding said shoes, and means for automatically shifting said wedges to predeterminedly vary the feed of the ring holder.

l8. .ln a. machine of the character described. a ring holder, :1 hammering memher, a pawl for rotating said ring holder, a rotating cam for operating said pawl having opposite shoes, Wedges for expanding said shoes, and means for simultaneously shifting said Wedges to predeterminedly vary the feed of the ring holder.

19. In a machine. of the character de-' scribed, a plurality of ring holders arranged with their axial lines substantially parallel, hammering members for said ring holders, means for actuating said hammering mem bers from asingle source of power, a pawl rod arranged and adapted to be reciprocated from the same source of power, and pawls on said rod for rotating said ring holders.

20. The combination with a machine of cam from the shaft of the first-mentioned 30 cam, and a second pawl on the same rod with the first-mentionedpawl for rotating the second ring holder.

ALBERT W; 'WENZEL.

Witnesses:

HOWARD P. KING, J ANET A. AYERS.

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