US1319000A - Machine for presenting tubes to grinders - Google Patents

Description

1. E. HOLBEIN.

MACHINE FOR PRESENTING TUBES T0 GRINDERfS.

APPLICATION FILED MAR. 5, I9I9.

Patented Oct. 14,1919.

' 5 SHEETS- SHEET l www n mk Q5 Ev HOLBEIN.

. MACHINE FOR PRESENTING TUBES TO GHINDERS APPLICATION FILED MAR. 5, |919.

Patented Oct. 14,1919.

5 SHEETS*SHEET 2.

Zafra/Ww? J. E. HOLBEIN.

MACHINE Foa PRESENTING TUBES To GRINDER'S.

APPLICATION FILED MAR. 5| 199.

Patented Oct. 14, 1919.

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WASHINGTON. D. c.

J. E. HOLBEIN.

MACHINE FOR PRESENTING TUBES T0 GRINDERS.

APPLICATION FILED MAR. 5| |919.

Patented Oct. 14,1919.

5 SHEETS-SHEET 4 .Till La PH C0., WASHINGTON. D. c.

1. E..H.0LB|N. MACHNE FOR PRESENTING TUBES T0 GRINDERSL APPLICATION FILED MAR. 5. |919.

Patented yOct.. 14, 1919.

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MACHINE FOR PRESENTING TITIBES TO GRINDERS.

Specification of Letters Patent. Patented 'ctg 14, 1.919.vr

Application led March 5, 1919. ,Serial No. 280,687.`

To all ywhom t may concern.'

,Be it' known that I, JOSEPH E. HOLBEIN, a citizen of the United States, residing at Fombell, in the county of Beaver and State of Pennsylvania, have invented certain new and useful Improvements in Machines for Presenting Tubes to Grinders; and I hereby declare that the following is a full, clear, and exact description thereof, reference be ing had to the accompanying drawings,

which form part of this specication.

This invention isa novel machine especially designed for presenting seamless steel tubing to a grinder so that it may be ground by such grinder to eliminate incipient seams or defects in the tubing prej paratory to further reduction in diameter of the tube.

The' invention includes novel means for longitudinally feeding a tube past a rela` tively stationary grinder operating thereon, and for simultaneously rotating the tube on its axis as it is fed longitudinally iforward; also novel means whereby the speed of rotation of the tube relative to its longitudinal travel canV be manually controlled and varied as. desired; also novel means whereby the machine is adapted to handle tubes ofvarying diameter; alsornovel means for imparting power continuously to the feeding units in whatever position they may be adjusted. The invention also includes various novel'features of construction and novel combinations of parts as hereinafter explained.

In the Vmanufacture of seamless steel tubing the defects found in the tube blank after passing through the hot mill must be ground out before the tube is cold drawn on the benches. These defects are fine seams in the blooms and billets, which when the billets are pierced, develop into longitudinal circular or spiral seams of varying pitch and irregularity.

My novel machine is adapted, by reason of the flexibility of the feeding unitswhich are always under the control of the operator-to enable the operator to bring the defects in the tube up to the `stationary grinder to be removed thereby in a facile and easy manner, and to lessen the manual labor required in grinding tubes, and enhance the speed and thoroughness o'f the grinding o erations.

While .t ie invention -is particularly def;

signed for' use in grinding tubes as stated? it could also be adapted lfor rotating iods, or bars, etc., whileothe same are vbeing fed longitudinally forward; and( while I shall hereinafter refer to the object being treated as al tube I use such word ias a generic term to include tubes, rods, bars, andother objects which might be fedv such machine to Va grinder or other means or mechanism operating thereon. I also use4 the word grinder as a generic term to include any means or tool operatingupon such tubef while the latter is beinginanipulated by the A machine.

'Io facilitate a comprehension of the invention I will explain in detail one practica] embodiment thereof-as illustrated in'thc l u A' accompanying drawings, but I refer to the claims for summaries of the essentials of the invention, the various novelffeatures of construction, and various novel combina# tions of parts for all of which I desire proteotion. It should .befunderstood, however,

that the invention is not restricted to the particular mechanism shown in the draw-v ings as when understood it maybe embodied in various designs and forms of machines which co-ulddifer in appearance and spe cific elements from that illustrated vin the drawings while embodying the essentials of.

the invention.

In said drawings:V

Figure l is a top plan view of a complete machine for rolling or turning steel tubing and the like while the same is being operated upon by a vrelatively stationary grinder. Y

Fig. Q is a side view of Fig. 1 with the pipe removed. y

Fig. 3 is an enlarged transverse sectional view on the line 3 3, Fig. 2.

Fig. 4 is an enlarged partial side elevation i i showing the feeding units adjusted to a different position from that shown in Fig. 1.

Fig. 5 is an enlarged detail sectional'view of one of the sets of feeding units.

Fig. 6 is an enlarged sectional View of the head of one of the pipe retaining levers.

Fig.V 7 is an enlarged sectional view of one of the heads on line 7 7 ,.Fig. 5. Y

Fig. 8 is a detail-sectional view o`n line 8&8, Fig. 7. i

Figs. 9, 1o, 11,12 and leeft `clliiiag'ram:

matic views illustrating various positions 'of the feedin heads and various movements imparted t ereby tothe pipes.

The operative par ico iid

-s' of the machine may be mounted in a frame of any suitable make and form. As shown the frame may be mounted upon grooved Wheels 1b by which it can be adjustably supported and guided on tracks 1c, so that the machine may be readily moved to the desired working position, kor to and Yfrom the grinder, or moved out 0f the way when not in use. Suitably journaled in this frame is a main shaft '2, which extends longitudinally thereof, and may be driven at the 4-desired speed from any suitable .prime mover. In the machine shown the shaft 2 carries ,friction disks 2 on` one end, which disks engage a `friction roller 3a slidably mounted on a vertical shaft 3, which is journaled in suitable bearings on `the main frame at one end thereof.

1n themachine shown the shaft 3 is Ageared toan electric motor indicated at `and driven thereby, but instead of Vbeing geared to a motor the shaft may be driven either directly or Vindirectly from any other suitable prime mover. The 'roller .3a may be adjusted radially .of the disks 12 by a link 3b connected v to a hand lever 3C, which is provided with a latch and segment of the usual kind to hold itin any desired adjusted position. Such ikinds of friction drives are old, and form no feature of the present invention; and any other suitable variable speed drive may be used.

0n shaft 2 isla series of spaced bevel gears 2b that respectively mesh with Lbevel gears 4b on the lower ends of vertically disposed shafts Ll, which are journaled in suitable bearings at the rear of the frame. As shown there are four such shafts l, and each shaft l .,is geared to operate one pipefeeding vand `Vturning unit, oi' set of feeding heads. As these units, in the construction shown, are duplicates, an explanation of one unitor set will explain all; similar letters being applied to similar parts 'in Vthe several units or sets.

l5.eferring` particularly to Fig. 3, each shaft ,-1- has on its upper enda bevel gear lu wh-ichineshes with a bevel gear 5a on a short shaft 5, that is disposed horizontally or transversely of the frame and journaled in suitable. bearings on the frame as shown. The inner end ofshaft 5 is pivotally jointed to one end o'f a flexible or Vtelescopic shaft member 5b, the other end of which is pivot- .ally jointed to the inner end of a vstub shaft journaled in a bearing 7 a on the upper end of a casting 7. which is pivotally mounted upon the frame at the front sidethereof.

Themeinber 'binay be -a`telescopic-shaft connection as rindicated in the drawings, such connection {bei-ng well'known needs no specific description herein; and various other'flex'ible shaft connections well known in the art couldbe used to transmit rotary motion xtothe shaft 6 from 'the shaft 5 and permit lateral displacement. of the shaft V6 relatively vto the shaft The shafts 5 and 6 lie practically transversely of the frame and in axial aliuement, but by reason of the flexible telescopic connection 5b between the shafts 5 and 6, the shaft 6 is capable of being moved laterally relatively to shaft while the rotative driving connection between the shafts 5 and 6 is maintained by the member 5a.

As shown the casting 7 is rigidly connected to a yshaft 7b that is `journaled in a suitable `bearing 1'e on the front member of the frame; and said shaft may extend inward from the front bearing and have its rear en d journaled in a bearing 1f in the frame; so as to firmly support the casting 7 while pern'iitting Vit to beswung laterally, and turn on or with shaft 7 b as its pivot.

On the front end of shaft 6 is a bevel gear i 6L which meshes with a similar bevel gear 6b on the upper end of a stub shaft 6c, which isvjorurnale'd Vin a forwardly projecting arm 'lc of the casting 7 and disposed at right angles to the shaft 6. VOn the other end of shaft 6c vis mounted a feed head 6e which may jbe retained on the shaft by any suitable means; being shown as retained thereon VVby mea-ns of a screw Gf tapped into the end of the shaft 6c and Concealed in a hole in Ythe center of the head. 6e.

'1t is desirable to have the A.head 6e connected to rotate with theshaft 6C' but capable of a partial independent rotary motion thereon, for a purpose hereinafter explained. As shown the head 6e has an arc shaped slot 6g in its base opposite an annular flange 6h onthe shaft 6, and a ball 6i is seated in av recess in the flange 6h and projects into the slot g and will permit a slight rotary inotion of theshaft 6c relative to head 6e equ al to the length `of the slot .6g (see Figs. 7 and 8). However the shaft and head may be connected to have a limited amount of relative rotary motion in any other suitable and preferred manner.

Each shaft il also carries a bevel gear 1l i'ueshing with a gear 15 on a stud shaft 15 suitably journaledl in the frame parallel with and below the shaft 5, and connected by an extensible or flexible shaft 15h .to a stub Ashaft 16 `lournaled in the lower end 17L of a casting or bracket 17. which is mounted upon the frame below and opposite the casting 7, preferably by means of a shaft 17D journaled in a bea-ring 1ex on the frame opposite and below the bearing 1e, and the inner end of the shaft 17b may be journaled in a bearing 1, below and parallel with the bearing 1f.y and suitably secured in the frame so as to support the cast.- ing 17 firmly on the frame while permitting it to be swung laterally on or with shaft 17b as aV pivot.

@n the front end of shaft 1G is a bevel gear 1 6 meshing with bevel gear 16b on .and'each being operated alike the lower end of a stub shaft 16c journaled forwarding and turnin a tube and with their operating devices form a' feed unit or set.

In the machine shown there are four units or sets of such coperating and forwarding devices; each set being constructedl alike a and simultaneously from the shaft 2.

The parts numbered 14, 143,15, 15a, 15b, 16, 16a, 16", 16e, l17, 17h, 17C, etc., are practically identical in construction tothe parts 4, 4a, 5, 5, 5136, 6a, 6b, 6e, 7, 7b, 7, etc., and therefore do not need a more detailed explanation.

The heads 6e, 16e may be semi-spherical, conical, or tapered,- but I prefer to make them semi-spherical as shown; and these heads may be of east steel, or any other suitable metal or` material that 4will be found best adapted to enable them toproperly engage and operate upon the tube as hereinj after explained.

The tube to be treated is adapted to be held in frictional contact with the faces of each pair of opposed heads 6e,-16e,by any suitable means, as indicated at T Figs.` 3, 4, and 9 -to 13.

A pressing or retaining member is provided adjacent eachpair of lfeed heads 6e,

16e, to hold the tube in Vfrietional contactwith such feed heads.` The form and arrangement of this pressing member may be varied and any desirable or suitable means may be employed for holding the tube in frictional contact with the feed heads.

In the machine shown each pressing or retaining member comprises a lever 8 slid-- ably supported at its' lower end on a bracket attached to the front of thev frame `belo-w the shaft 1K6, and shown as connected therewith by a pin and slot connection 8a, (see Fig. 3).. This retaining lever extends upwardly from its support toward the shaft 16, and is then curved outwardly and up- 1 wardly and extends to a point slightly above the lower head 16e. -Below the shaft 16 the lever 8 passes through a slotted guide 9 attached to the front of the frame; which guide prevents lateral movement of the lever but permits it to have a swinging or oscillating movement toward or from the isadapted to engage the Ysid-e of thetube as shown in- F ig; 5,".and hold the same-'against' the adjacent feedheads Y6", 16e; and may' be caused' lto engage and lhold the tube against the heads by any suitable-means'.` As .shown a toggle 18 hasone member pivotally' connected to thelever 8adjacent its lower end and its other member is pivoted to the frame as shown. The knuckleof the toggle is pivotally lconnected to the lower end of a link 18", the vupper end ofwhich is connected to :a crankarm 18C on a rock shaft 18d, suitably supported on Ithe main frame,and extending preferably to a point adjacent the drive V`end of the machine. Shaft 18d can be provided with a Vcrank handle 18e by which it can be rocked.

vWhen the crankl 18e is thrown to uppermost position the toggleV 18 will be broken and the lower end of lever 8 moved Atoward the frame, causing the'lever 8 to rock on the fulcrum bolt 9'?l and its yupper end to move away vfrom the tube T and thus release the latter. When ,the crank 18e' is thrown in position to extendthe toggle, as shown in Fig. 3, the lower end of leverA 8 is pushed outwardly and thelever fulcrums on the bolt 9a 'and its upper end contacts with the tube and holds the latter against the feed heads. The amount of pressure eX! erted'by the lever 8-on'ithe tube, and 1resultant pressure of the tube against the feed heads is regulated by adjusting the bolt 9a. I To reduce'or'lessen friction between theVv pressing lever 8 and the tube Tthe upper end of the lever is preferablyprovided with an antifriction contact device of any suit-g able construction. As shown in Figs."3`and 'y keep the roller 8e on avertical axis, or atl right angles to the tube T.' Preferably antifriction'means, such as balls 8i, is'interposed between the base of the Vcasting 8f and the head of lever-8 so thatv the casting 8f vmay readily oscillate on the bolt 8g and permit the roller 8e to ytilt slightly from a verticall position as may be required when the tube T in addition to its longitudinal movement past the lever 8 is also being rotated on its own axis. Thus the roller 8e can automatically adjust itself to suit the movements of the tube and hold the latter against the feed heads with the least possible amount of retarding friction. Y i.

As shown eachunit'or set'of feed' heads is'provided with asimilar retaining device;

alike, similar kparts being indicated by similar reference numerals, furtherY illustration and explanation thereof is unnecessary; Y

above stated,"'seains or incipient flaws:

` and as each set of -feeddevice's is constructed in the tubes are developed in the initial drawing process, and must be ground out before redrawing the tubes. These seams or flaws vary indirection and form. Most frequently these flaws are in spiral formation, and such spirali-aws .may be substantially regular for any one piece off tubing; but the pitch of the spiral flaws in different tubes usually differ. 'It is therefore necessary, to enable the machine to act efficiently on all kinds of tubes, that the feed heads be adjustable and capableof not only forwarding the tubes longitudinally lpast the grinder, Ibut also rotating the tubes in accordance with the pitch `of the spiral flaws therein so that asthe tube is -fed past the grinder it will be rotated more or less-rapidly according to the spiral pitch of vthe flaws and be fed past the grinderat such speed of longitudinal movement and rotary movement as will 'practically' cause the spiral flaws, of whateverr pitch, to be vpresentedY preferably arranged at Ythe side of the ina.

chine intermediate the two innermost sets of feed heads; the tube handling machine beingmovable bodily to or from the grinder, or vice versa, so that when a tube is entered in the machine it Amay be brought into contact with the grinder .and held in contact therewith while the tube is Vfed longitudinally past the grinder. The grindershould be rotated at high speed while the `tube is being lfed therepast, and is in contact Itherewith, sothat it rwill grind away theincipient seams or flaws in the surface ofthe tube. As these flaws are very shallow it does not require much ,grinding to obliterate them,

but if they were not obliterated, in the subsequent redrawings of the tube the flaws would tend to deepen and render the tube worthless when reduced to the desired size.

The feed heads, 62.162 in each set are relatively adjustable .so that they can both feed a tube longitudinally and simultanei ously impart. a rotary-motion thereto, and they may be adjusted even 'while in Contact with a tube; and for this purpose the feed heads are preferably made semisspherical. oi' so relatively shaped, that their axes may be adjusted to different relative angles while the heads still maintain effective Contact with the tube.

As shown vin Figs. 9 to 13 the heads may be shifted from a position in which their axes are in alinement. endto end in the ysaine plane; to `a position in which their a-Xes are parallel in different planes. 0f course theyy may be adjusted to any intermediate position. Vhen adjusted to the positionsshown in Fig. 9 the tube would be fed straight through .without any rotation. V,Inthe position vindicated in F ig. l0 the tube would bc fed and rotated on its axis at about a 300 spiral. In Fig. 11 the tube would be fed and :rotated at about a 4.50 spiral. In Fig. 12 the tube Vwould be fed and rotated at about a 60O Spiral; and in Fig. 13 the tube would be fed and rotated at about a 900 spiral. Thus by adjusting the relative pitch of 'the heads the opei'ator can` feed the tube and turn the saine so that straight or spiral seams of any pitch oi' contour can be properly presented to the ,grinder as the tube is fed therepast. Any suitable means ina-y be provided for adjusting these feed heads for the purpose specified.

iTn the machine shown each shaft 7b has a crank arm 'Tf that is pivotally connected to ya link bar 7g; which `in turn is `piifotally connected by a link 7h to one arin of a lever 10, that is pivoted at l0a on any suitable support on the frame. Each shaft 17') vhas a crank arm 17f pivotally connected to a link 17g that is connected by a link 17 to thelever 10 at the opposite side of the pivot l()el offsaid lever. The pivotal` connections of links 7h and 17h to the lever 10 are shown as equi-distant from the pivot 10 of lever 10. The lever 10 is operatively vconnected by a flink l()b to a longitudinally movable slide barlOC Amounted in a suitable guide 1G in thefranie. Bar l()c has a rack 10d which mesheswith a pinion 11e on a shaft ll suitably mounted in the frame and operable by a hand wheel 11a. This hand vwheel is preferably arranged adjacent the drive so that the operator `can easily Vcontrol the speed of the drive shaft Q, by manipulating the lever 3,.and also by turning rthe hand wheel 11a.

O Apemtz'on.

When itis desired to grind a tube themachine and grinder are properly juxtaposed so that the grinder will be in position to operate upon`the tube as it is fed therepast Y by the'machine. The pressing levers 8 are properly adjusted relative to the feed heads 6, 16e to suit the size of tube to'he operated upon.'.fThe operator then sets off the press ing'levers 8 fromthe two sets of heads '66,

16e at the incoming end of the machine andrk enters' the end of a tube T between such heads and the pressing levers, and then sets up the pressing levers so as to hold the tube f cause the tube to be fed past the grinder at the desired rate of speed and with such a twisting or rotating movement as will cause thetube to present thespiral liavvs-therein to the grinder. The Voperator can vary the "the tube, by ladjusting the relative inclinationof the opposed feed heads/in each pair or unit, as above explained.

To facilitate the 'adjustment of the heads while in engagement with the` pipe, each head is preferably so connected vwith its shaft as to permit a partial relative rota tion between the head and its shaft, as indicated in Figs. 7 and 8; for the reason that to adjust the heads in one direction they must be shifted in the directionfin lwhich they are rotating; and to adjust them in the other direction they must be shifted contrary to the direction iir which they are tion the latter adjustment is facilitated.

As thet-u'bes are usually long and'prcferably straight I prefer to have the tube operatively held by only two sets of the feed heads at atime; thus, if the tube is entered between the rst two sets, at the right in Fig. l, then after its end has 'engaged the third set'of feed' heads the pressing lever of the first set'of feed headsfcan be releasedby shifting' its controlling lever 18e and leaving the tube under control of the two intermediatesets of feed heads; and then when the tube end enters the fourth set of feed heads the pressing lever of the second set of feed heads may be released. This will lessen strain onthe machine' and facilitate the treatment of slightly bent tubes.

The'maehine can be operated rapidly and efliciently, and will 'greatly facilitate the operation of grinding the tube; save time and labor in such operation, and produce better results..

It will be seenthat the operator has the work always under his directconti'ol; and ,that the tube is positively held vand fedto the grinder by mechanism always under the control of the operator, and the labor ina grinder, means` for feeding a'tube Ylongitudinally past the' grinder'and rotating on its axis to present spiral flaws in the tube to the grinder; with means for varying the speed of travel and rotation ofthe tube past the grinder during grinding operation.'V

2. In combination with ,a grinder, means for feeding a tube longitudinallypast the Vcoaclting feed heads-means for holding atu'be f grinder and IIieansv for4 simultaneously rotaitinl the tube on'its airis so that the grinder `can ollow lspiral flaws in the'tube; w-ith manually controlled means for varying the Y speed of travel and rotation of the tube past the grinder during the grinding operation. In a machine for' presenting tubes to grinding mechanism, etc., means yfor feeding a-tube longitudinally past the grinder, and means for simultaneously rotating it on its' axis to presentspiral flaws in the tube to th'e grinder; with manually controlled means for varying the travel and'rotation of the tube past the grinder. f y V' 4. In a machine forpresenting tubes to. agrinder, semi-spherical feed heads'adapted to both feed a tube longitudinally multaneously rotate the tube.A

5. vIn' combination, a grinder, and adjustable feed heads adapted to both a tube rotating. By mounting the heads on their shafts so as to permit partial relative rotalongitudinally past thegrinder andsimull taneously rotate the tube andmeans for ad-A justing the heads during'a grinding opera- .both feedl a tube longitudinally and simultaneously rotate the tube; with means for 'Y vadjusting the heads atv varying angles to the tube during a grinding operation to vary the speed of feed and-rotation of the tube.

7 In combination, a grinderg'feed heads l adapted'toboth feed a. tube'longitudinally pastk the' grinder' and simultaneously rotate the tube; and manually operable means for adjusting the heads to vary the Ispeed yof feed and' rotation of the tube.`

- 8. In a machine for presenting tubes to grinding mechanism, the :combination of sets of related rotatable feed heads adapted to both feed a tube longitudinally past the grinder and simultaneously rotate the tube;

with manually operable means 'for adjusting the heads at varying angles to the tube. i

9. In combination, a grinder; feed 'heads adapted to both feed a tube longitudinally past the grinder and simultaneously rotate the tube; and means for adjusting the heads while in contact with the tube, to vary the V speedof feed and rotatioirof the tube, at varying angles to'. the tube.

10.V In a'machine for presenting Itubes to grinding mechanism; the combination of a plurality of sets of coacting feed heads, means for adjusting theV heads to vary 4the -feedof the tube during ai grindingfopei'ation, means for rotating the heads, and means'for holding a Vtubejin frictional con-V tact with said heads. 1 -f 1l. In combination, opposed coacting feed heads, means'for holding a tube in frictional contact with said heads;fmeans1 for rotating the vheads ontheir axes; and vmeans for'adjusting` the heads at varying angles to the tube.

'12. In combination, a grinder opposed 4in frictional Yc'ont'actwith'' said-'heads ;`A means iio Vadapted tol frictionally engage a tube; nieans A for rotating the heads onltheir axes', inea-iis kio for holdinga tube in frictional contact with said heads; and manually operable means for adjusting the headsat varying angles to the tube. i

1,4. In a machine for .they purpose speciiied, feed heads adapted to engagea tube, means for rotating the heads, a lever for holding a tube in frictional contact with said heads; and means` for adjusting said lever.

15. In combination, opposed coacting feed heads adapted to frictionfally engage a tube, means for rotating the heads, a lever for holding a tube in frictional contact with said heads; manually controlled means for adjusting said lever, and manually operable means for adjusting the 'heads at varying angles to the tube to vary thespeed of'feed and Vrotation of thev tube.

16. In combination, a. plurality. ofr sets .of coactiiig feed heads adapted to frctionally engage a pipe or rod; .means forrotating the heads on theiraxes; a lever vadjacent each pair of vheads for holding a tube in frictional contact therewithgnieans for adjusting said levers, and means for adjusting the heads at varying angles to the tubes, substantially as described.

' 17. In a machine for the purpose specified,

,the combination of a plurality of sets of opposed coacting feed heads adapted vto frictionally engage a pipe or rod; nieansfor `rotating the heads on.their axes; a lever adjacent eachv pair of heads for yieldingly holding a tube in frictional contact therewith; manually vcontrolled means for adjusting said levers; and manually controlled V`tively .stationarily mounted driving gears and flexible driving connections between the said driving gears and the gears on the shafts. f

19. In combination, a pair o-f similar but opposite feed heads, a rotatable shaftcarr-y- `ing eacli head, a gear on each-shaft, adjustable brackets supporting said shaft, arms 'connected with said brackets, slidable `bars connected with said arms, 'andmeans-for simultaneouslyk foperating ,said bars `so as ,-to adjust the @heads to different angles.

20. In combination, a pair of similar but opposite feed heads, a rotatable shaft carrying eacliliead, a gear oneach shaft, adjustable brackets supporting said shaft, arms connected with said brackets, slidable bars connected `with said arms, and means for simultaneously,operating said bars so as to adjusttlie heads to different angles; with driving gears and flexible driving connections Ybetween l,the said `driving gears Vand the gears on the shaftsof .the feed. heads.

21. In a macliineof -the character described, a seini-spherical feed head, a shaft on which thishead is mounted, and mea-ns for permitting partial relative rotation between the shaft and the head.

22. In a machine of the character described, a semi-spherical -feed head, a shaft onwhich this head isinounted, and means for permitting partial relative rotation between the shaft and thehead; Vwith ineans adjusting the toggle to oscillate the lever Y.

on its fulcrum.

24. In a machine of the character specilied, a. pressinglhead, van anti-friction selfadjusting device pivot-ally connected with the head and adapted to engage the work,

and means for adjusting theheadto press the device againstthe object beingoperated upon. ,g

25. In a machine ofthe character specilied, tube feeding means,. a-presser, an antifriction self-adj usting device connected with thepresser adapted to engage thework. and means for adjustingvtlie presser so vas to hold thedevice in Contact with the tube.

26. In a machine of the character specitied, a pair of feed beads', a presser lever` an anti-friction roller, a support for said roller pivotally connected ywith the lever;

TFO

and means .for adjusting the lever to cause the anti-friction roller to j'hold a tube in contact with the head.

27. In a machine of the character specified, the combination of a driven shaft, upper and lower gears on said shaft, upperl and lower feed heads, shafts respectively carrying said feed heads, and y gearing between the upper and lower feed. heads and yupperand lower gears on the driven shaft.

28. In a machine of the character specified,

the combination of a driven shaft, upper and lower Ygears gon said -`Shaft, .upper and v lower feedlheads shafts respectively carrying said lfeed heads, and .gearing between the upper andilower feed headsand upper and lower sears 0n theA .driven vShaft iirthmeavs whereby the said heads may be adjusted to various relative positions while maintaining their geared connection.

29. In a machine of the character specified, the combination of a driven shaft, upper and lower gears on said driven shaft, upper and lo-wer feed heads, shafts respectively carrying said heads, and connections between the gears on the said head shafts and the gears on the drivenV shaft, said connections permitting swinging movements of the heads relatively to the driven shaft.

30. In a machine of the character specified, the combination of a driven shaft, upper and lower gears on said shaft, upper and lower feed heads, shafts respectively carrying said heads; swingable supports in which said head shafts are journaled; connections between the gears on the said head shafts and the gears on the driven shafts, said connections permitting rocking movement of the heads, and means for adjusting said swingable supports to vary the positions of said heads.

3l. In a machine of the character specie` fied, the combination of a driven shaft, upper and lower gears on said shaft, upper and lower feed heads, shafts respectively carrying said feed heads, and gearing between the upper and lower feed heads and upper and lower gears on the driven shaft; with an adjustable presser lever adjacent the heads, a toggle for throwing the lever into or out of operative position; manually controlled devices for operating said toggle, and .manually controlled devices for adjusting the relative position of the heads.

32. In a machine of the character specilied,V the combination of a driving shaft, a series of gears thereon, a series of counter shafts respectively geared to the gears on the driving shaft, upper and lower gears on said counter shafts, pairs of upper and lower feed heads, shafts respectively carrying said heads, and gearing between each pair of upper and lower feed heads and upper 'and lower gears on the related counter shaft.

33. In a machine of the character specified, the combination of a driving shaft, a series of gears thereon, a series of counter shafts respectively geared to the gears on the driving shaft= upper and lower gears on said counter shafts, pairs of upper and lower feed heads', shafts respectively carrying said heads, and gearing between each pair of upper and lower feed heads and upper and lower gears on the related counter shafts; with means whereby the said headsy may be adjusted to various relative positionsk while maintaining their geared connection.

34. In a machine of the character specified, the combination of a driving shaft, a series of gears thereon, a series of counter shafts respectively geared to the gears on the driving shaft, upper and lower gears on said counter shafts, pairs of Lipper and lower feed heads; shafts respectively carrying said heads; and connections between the gears on the said head shafts and the gears on the related counter shafts, saidconnections permitting rocking movements of the heads.

35. In a machine of the character specified, the combination of a driving shaft, a. series of gears thereon, a series of counter shafts respectively geared to the gears on the driving shaft, upper and lower gears on said counter shafts, pairs of upper and lower feed heads; shafts respectively carrying said heads; swingable supports in, which said head shafts are journale-d, means for adjusting 'said swingable supports to vary the relative positions of said heads; and connections between the gears on the said head shafts and the gears on the related counter shafts, said connections permitting series of gears thereon, a series of counter shafts respectively geared to the gears on thedriving shaft, upper and lower gears on said counter shafts, pairs of upper and lower feed heads, shafts respectively carrying said'heads, and gearing between each pair of upper and lower feed heads and upper and lower gears on the related counter shaft; with an adjustable presser lever adjacent each pair of heads, a toggle for throwing each lever into or out of operating position; manually controlled devices for operating each toggle; and manually controlled devices for adjusting the relative position of the feed heads.

In testimony that I claim the foregoing as my own, I affix my signature.

f JOSEPH E. HOLBEIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner o'f Patents,

Washington, D. C.

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