US1475171A - Tube-milling machine - Google Patents

Description

Nov. 27, 1923.

' E. H. CHAPMAN TUBE MILLING MACHINE Filed Sept. 9, 1919 8 Sheets-Sheet 1 IN VEN TOR ATTORNE vs 8 Sheets-Sheet 2 E. H, CHAPMAN TUBE MILLING momma:

Filed se t. 9, i919 Nov. 27,1923.

Nov. 27 1923.

E. H. CHAPMAN TUBE MILLING MACHINE Filed Sept. 9, 1919 8 Sheets-Sheet 3 INI/E/VTOR v QQQEQ A TTOR/VE Y8 Nov. 27, 1923v 1,4751% Y E. H. CHAPMAN TUBE MILLING MACHINE Filed Sept. 9, 1919 8 Sheets-Sheet 4 n k g ATTORNEYS Nov. 2?, 1923. mum

I E. H. CHAPMAN TUBE MILLINQ MACHINE v Filed sepp. 9, 191's 8 Sheets-Sheet 5 A TTOR/VEYS Nov. 2?, 1923. LWSJE'E 7 E- H. CHAPMAN v TUBE MILL-ING MACHINE Filed Sept. 9, .1919 8 Sheet s-Sheet e l/VI/ENTOR.

ATTORNEYS Nov. 27, 1923. 1,455,171

E. H. CHAPMAN TUBE MILLING MACHINE Filed Sept. 9, 1919 8 Sheets-Sheet 7 ATTORNEYS E. HNCHAPMAN TUBE MILLING MACHINE Filed Sept. 9, 1919 s Sheets-Sheet a A TTOHNE V8 Patented av. 27, 1923.

in OFFICE.

EDWARD H. CHAPMAN, OF BETHLEHEM, PENNSYLVANIA.

TUBE-MILLING MACHINE.

Application filed September 9, 1919. Serial No. 822,814.

Y To all'whom it may concern:

Be it known that I, EDWARD H. CHAPMAN,

a citizen of the United States, residing at,

Bethlehem, in the county of -Northampton,

State of Pennsylvania, have invented a new and useful Tube-Milling Machine, of which the following is a specification.

This invention relates to the class of machines which are adapted to mill the ends of.

tubes, particularly the water tubes of boilers of which, for instance, the Yarrow boiler is a type,-taking them in rough stock lengths and bringing'them to predetermined nace of a type suitable for the purpose.

The principal object of my invention is an organized machine in which any plurality of tubes the ends of which it is desiredto mill, that is, cut off, reamed or threaded, are

one by one and rapidly fed to the milling mechanism, and, after being milled, are one by one and rapidly transferred from .the machine either to a furnace when it is in contemplation that the milled tubes shall be annealed or otherwise treated, or else to an ultimate receptacle in which they are to be deposited.

To the foregoing principal end, my invention comprehends an organized machine in which there are assembled in co-acting relationship certain elemental instrumentali ties which include the following Means for feeding tubes to be milled to the milling, devices,meansfor receiving each tube as fed and securing it in place to have its ends milled,means for milling, by

simultaneous operation both ends of the.

tube as secured in place,-means for endwise adjustment of the milling means,- means for actuating the milling means to efiect their operation simultaneously and, preferably, in reverse directions upon both ends of the tubes,--means for removing each tube after having been milled. from the means which secure it in place to be milled,- means for operating the'securing means, the milling means, and the removing 'means,-- means to permit of the removal of the milled tube from the machine.and, in conjunction therewith, a furnace, or other ii'ltimate receptacle.

Such being. the general organization of my elemental means, I prefer to employ for feeding the tubes, inclined guide rackets down which they roll in successive order to the milling devices.

Further, I prefer to employ similarly organized or counterpart, but op ositely disposed vertically mounted cylin ers the pistons of which, subject to fluid control, co-

operate with clamping or holding devices which retain the ends of the tubes in juxtaposed alignment with the milling heads,- and also to employ milling heads, similarly counterpart and oppositely-disposed, which under the control of pistons of'horizontally and oppositely-disposed cylinders, and also of means for rotating them, are forced against both ends of the tube so as to efi'ect the milling,employing for'the control of the pistons of both sets of cylinders, a valve mechanism for the motive fluid.

Further, I prefer to employ means for tion I have shown in the accompanying drawings acertain type and embodiment of 'it which is at present preferred by me be cause in practice it has given satisfactory and reliable results.

It is to be understood, however, that the various instrumentalities in which my invention is shown as embodied, can be variously arranged and organized, and that my invention is not, therefore, limited to the precise arrangement and organization illustrated and typified in the constructions represented in the accompanying drawings and herein described.

In the accompanying drawings, Figure 1 represents a front elevation of a milling machine embodying a preferred organization of my invention.

Figure 2 represents atop plan view of furnace bein the machine of Figure 1,+a typical heating represented in association therewith, to illustrate in a general way how my milling machine may be connected with a furnace.

Figure 3 represents an end elevation from the r1ght-hand side of my machine and of the typical furnace represented in Figure 2.

Figure 4 represents a central, sectional side elevation through the left-hand vertica c linder, theleft-hand horizontal cylinder, the driving gears of the left-hand milling head, and the neral mounting of these elements with re ation to the bed of the ma- 'chine,oertain of the parts being shown in elevation.

Figure 5 represents an inside end elevation of the vertical cylinder shown in Fi re 4, illustrating also its supporting stan ard and bed plate, a bracket bearing for the driving shaft, the clamping control and the release devices connected respectively with the vertical piston and the vertical linder,-the clamp block 31 of Figure 4 and a portion, of the tube resting upon it being omitted, and the. scale being slightly different.

Figure 6 represents a plan of Figure 4, illustrating particularly the vertical cylinder, the head bearing, the bed plate and in central and longitudinal section the bearing 13 for the milling head shaft 9". c

Figure 7 represents in enlarged detail, a horizontal section on the line 7--7 of Figure 4, of the horizontal cylinder 21, itsiston and part of-the milling head shaft being shown in plan.

Figure 8 represents in central, horizontal plan an eight'way valve of the character which I prefer to employ in connection with the motive fluid pipe line system which I prefer to make use of for the predetermined control of the vertical pistons and of the horizontal pistons.

Figure 9 represents a section on the line 99 of Figure 8, of one of the positions of the valve and its-ports.

Fi re 10 similarly represents a section on the line 1010 of Figure-8, of another position of the valve and ports.

- Figure 11 similarly represents in section on the line 99 of Figure 8, another of the positions of the valve and ports.

Figure 12 similarly represents in section on the line 9-9 of Figure 8, another of the positions of the valve and ports.

The several positions indicated in Figures 9, 10, 11 and 12, and the service which the valve performs in them, are hereinafter fully explained. Similar numerals and letters of reference indicate corresponding parts. v

Referring now more particularly to the first three figures of the drawings,1 designates the bed of the machine, erected upon pedestals 2 and 3. Upon the left-hand end of the machine a motor base 4: is supported from the pedestal 2 b a brace 5 or similar supporting device, an upon the shaft of the motor 1 15 mounted a driving pinion 6 in mesh with a driven gear 7 mounted upon the left-hand end of a driving shaft 8 aralleling the bed of the machine and suitably housed for rotary movement below its top level. The driving pinion 6 and driven gear 7 together form a reduction gear for the motor driven machine considered as an entirety.

The milling machine operates simultaneously upon both ends of the tube T to be milled, through the instrumentality of counterpart milling heads 9 and 10, the construction of which is hereinafter referred to and'illustrated in detail in Figures 4, 5 and 7. i

The milling heads are, one or both, adjustable endwise upon the bed to adapt them to operate upon any length of tube, by being so organized and applied to the bed as to be adapted to traverse it a given distance lengthwise in opposing directions.

The milling heads 9 and 10 are respectively mounted upon milling head shafts 9 and 10".

late 14 or 15, which are adapted, one or 0th, the right-hand bearing alone as illustrated, to. travel in slide ways 16 upon the bed of the machine. In addition to the support of the bearings 13, each milling head shaft' is housed in connection with a head bearing 18 in a vertical standard 19-which supports a vertical air cylinder 20,- and is also housed in a ball-bearing formed within a horizontal air cylinder 21,--all as shown in the detailed drawings Figures 4, 5, 6 and 7 and hereinafter more particularly describe v Inasmuch as the drivengears 11 are feathered upon the milling head shafts, it will be obvious that the milling heads, the vertical air cylinders, the horizontal air cylinders and the bearings for the shafts, as well as said gears 11, can, one or both as an assemblage, be moved with relation to the bed so as to be brought together or separated given distances, to adapt the milling heads to operate uponany length of tube to be milled.

The operation of the milling heads by the action of the pistons of the horizontal air cylinders hereinafter described, is such as to force them against the ends of the the tubes, I divide the driving shaft 8 into two parts, bythe interposition of reversing bevel gears which I have designated 23, and which in the general mode of construction and application to the bed of the machine, I have particularly illustrated in Figures 1 and 2. I

This reversing bevel gear functions'solely to effect the reverse rotation of the two divided ends or end portions of thedriving shaft 8, in order that a driving pinion 12 I rotating in one direction with one end of the shaft may drive its driven spur wheel 11 in one direction, while a. counterpart driving pinion 12 on the other end ofthe shaft will a rive its driven spurwheelll'in the ,op-posite direction, with theresult already mentioned that the two milling-head. shafts-will be rotated in reverse directions to occasion the opposite rotation and action of the milin heads.

%t-il-l confining myself to the general assembly of my machineas illustratedin ' Flgures 1, 2 and 3, and employing-selected numerals to designate particular generic partsor elements of the machine as' an' entirety, which elements are particularly illustrated in the drawings commencing-with,Figure 4 and ending with Figure 12,-'- I, v

24 designates-an air valve reversing gear,

which, through a system of leve'rs-and con' nesting rods designated, particularly in.

Figure 2, as 25, 25*, 25 25 25 and 25*, operates upon both the vertical air cylinders 20, which are provided with tube-clamping controls designated 26 and with release orv v knock-off devices designated 27, and to-v gether control the lifting and release of thetubes,and also upon the horizontal air cylinders which control the advance and retraction of themilling heads and operate subse uently to the operation of theve'rt'ical -airoy inders,--all as hereinafter described.

28 designates typical runways upon which the tubes after being milled'are deposited and permittedto roll gravitatively on to a conveyor system 29 operatin in conjunction with any furnace that may be employed in connection with mymillingmachine.

When the tubes are brought to my milling machine they are first deposited upon guide brackets 30 particularly illustrated in Figures 2 and 3, which are supported by any referred bracing connecting them with the ed of the machine, their disposition relatively to the bed being angular, so the tubes roll down them until they reach and rest upon longitudinally recessed or guttered clamp blocks 31 erected "upon the bed plates .ldand 15, upon which, as already explained,

mounted upon the'bed of the milling shaffs' i a-nd their adjuncts are zontalair cylinders are forced forward and the milling heads through their pinions 12 and spur wheels 11 thrown into action to effect the milling. v v v The system of levers and connecting rods designated 25 to 25*, as already mentioned. typically illustrated in the first three figures, is actuated by a controllin disc 32, centrally the/machine antl sufl'iciently illustrated in said figures.

Extending transversely beneath the bed is a wormshaft 33, the mounting of whi h with reference to the-bed is illustrated in Figures 1 and 2, which is provided with a universal joint connection 34 to a link shaft 37, upon the opposite side of the ,bed, and which is actuated to the desired rotation by being'operatively connected witha worm 35 on the driving shaft 8;

A supplemental worm gearin'g 36 at the outer or distant end of the connecting device whichI have termed a link shaft- 37, o:- casions the predetermined rotation of a conveyorshaft 38 housed in relation to the front I of a typical furnace and serving to support and rotate conveyor sprockets 3.) which by if the furnace be of ,another'type, and it serves simply as a means of physical conveyance of the milled tubes as successively deposited upon it across the furnace,and

is, of course, adapted to deposit the milled tubes upon any receiving device such as a platform or truck. J

To the extent that I have thusfar described my invention and inridentally in a sufficiently explanatory way its mode of operation, I have treated it and its component elements and their adjuncts as a typical organization, and although as I have already explained, I- donot confine myself to the specific forms and constructions of the operating elements, I have in practice found that certain types of them are well adapted for my purpose and I will therefore no-w describe typical and preferred embodiments of the elements themselves.

Referring, first, to the counterpart assemblages of vertical and horizontal cylinders,

milling heads, milling head shafts and means for rotating, advancing and retractmilling heads more closely together or fur-- therapart to adapt them to operate upon tubes of different lengths,which is that shown at the right-hand of the organization of the first three figures,-the two organize tions or embodiments are counterparts.

Premising that the fluid control which operates uponthe pistons of both of the vertical cylinders and upon the pistons of both of the horizontal cylinders, is controlled by a valve v of, for instance, the typical organization shown in FiguresS to 12 and later explained, I desire it understood that the cylinders shown and describedaretypical cylinders merely well adapted for my purposes and that other types may substituted for them. r

The typical vertical cylinder 20,.Figures 4, I

5, and 6,'conta1ns a vertical piston 20*, the outwardly-extending lower .end of which is formed or providedwith a transversely extending exterior head, which is bifurcated at its end nearest the vertical standard 19 and so as to be adapted to travel upon a guide web 19* extending forwardly from and being a part of the vertical standard 19, this being an arrangement intended to prevent possible rotation of the piston within its cylinder.

At their ends furthest from the standards, these heads have attached to themthe clamping controls 26, which are conveniently merely a pair of spring clips, the lower oppositely curved ends 4A of which are adapted to be sprung upon a tube resting upon the clamp blocks 31, when the'pistons descend, and which co-operate with clamping blocks 45 which are longitudinally cylindrically recessed to make them match with the upturned correspondingly but oppositely re cesscd carrying heads 31*, 0 blocks 31.

In the operation of securing a tube to be milled upon the clamp blocks 31, the descent of the pistons 2O? not only through the clamping blocks 45 and the curved ends of the clamping controls, effects the holding or securing of the tube, but also, after the milling has been completed, in the elevation of the piston assures the lifting of the tube from the clamp blocks 31, through the agency of the clamping controls, up to a point when the tube encounters the release devices 27 on the cylinders which force the tube free from the. clamping controls and the clamp.

permit of its rolling ofif upon the runways 28.

Therelease device 27 is simply a depending knock-0E bar rigidly bolted to the front faceof each vertical cylinder 20 as shown in Figures 4 and. 5.

The reciprocation of the vertical pistons under the influence of the valve hereinafter described, which controls the motive fluid from a source of Sn ply, utilizes a difi'erential pressure area w ich in the embodiment illustrated is greater at the top of the vertical cylinders and less below.

The upper vertical piston packing 46 is Y confined by a nut &7, which results in the area" 48, Figure 4:, above the packing being greater than the cylindric area 49 which surrounds the piston within the cylinder, and within whichlast named area the motive fluid is constantly contained,

InFigure 4, 5O designates the lower piston packing which may, if desired, be of the special form shown in connection with the outer end of the horizontal piston 21 particularly illustrated in Figure 7.

"\Referring now to the horizontal cylinder 21 shown in preferred detail in Figure 7, the horizontal piston is designated 21*, and the special construction that I prefer to employ is the following The piston itself being of less diameter than the'interior of the cylinder so that a cylindric area 51 exists around it,the rear stufiin box is conveniently composed of a pair 0 washers 52 between which is a separating disc 53 and behind which is a nut54 threaded upon a rearwardly extending stem 55 of the piston which by being screwed inwardly compacts the Washers to close any leakage of motive fluid.

In the detail of this stufling box it will be observed that the piston is formedwith a circumferential shoulder .56 diametrically fitting Within the cylinder, and that it is somewhat reduced at its inner end as at 57 to permit of the outer washer being folded over it so as to present a broad surface of contact with the interior of the cylinder, as in similar manner the inner washer folds over the clamping nut 54,

At its front, end the horizontal piston 21 is chambered as at 58 and at 59, to receive the inner end of the milling head shaft 9", which is rotatable upon two confined ball races 60 and 61 within the outer chamber 59, which races are secured by a nut 62 screw-v ing within the piston chamber 59.

The outer end of the horizontal cylinder isprovided with a stuffing box composed of an inturned washer 63 which is confined by a cylinder head 64: against a ring 65 internally recessed to receive the inturned part of the washer 63, and which through the force of head-retaining nuts 66 is itself ioo As already referred to in connection with the vertical pistons, the reciprocation of the horizontal pistons is under the influence of a valve which controls the motive fluid from its source of supply, and utilizes a diflferential pressure area which, as illustrated, is eater at the inner end of the cylinder and less at the outer end, the area 68 at the inner end of the cylinder :beyond the packing washers 52, being greater than the cylindric area 51 which surrounds the piston within the cylinder, and within which last named area the motive fluid is constantly contained.

The inlet port of the cylinder and its outlet port into which respectively lead the pipe lines a and b, are illustrated in Figure 7 in connection withv the horizontal cylinder shown and respectively connected with" the pipe line system hereinafter explained.

In Figure 4 the bracket bearing 8 which carries the left-hand end of the shaft 8 is particularly illustrated, and is preferably integral with the bed plate/14 with which the caring 13 for the milling head shaft 9* and the vertical standard 19 are also integral.

In Figure 4 there are also represented the feather 69 within the hub of the driven spur wheel 11 and the featherwa 70 on the milling head shaft 9". In a dition, there is reperesented 'the socket 71 for the milling tool of whatever type may be used.

Referring now to Figures 8 to 12 inclusive, 72 is a cylindrical valve casing which is shown in Figures 1 and 2 as supported below the bed of the machine and as extending transversely thereof.

The valve of this casing, the tapered body of which within said casing is designated 73 and the hollow tubular interior 76, is,- in the organization shown, at its end which is nearest to the furnace or delivery side of the milling machine proper provided with a valve crank 74 connected with the connecting rod designated in Figure 2 as 25*, and which extends to the right hand end of the machine and is connected with a crank 25' on the rear end of a'crank shaft 25 which on its front end is provided with a crank 25 which is operated by the connecting rod 25, Figures 1 and 2 and the distant end oil which is coupled to a wrist pin 25 which plays in a segmental slot 24* in what I have termed an air-valve-reversing-gear 24, the same being a disc on the worm shaft 33 as best shown in Figure 1.

Obviously, in the rotation of the drivin shaft 8, the rotation of the worm 35 will, .by its operative connection with the worm shaft 33, occasion the rotation of the said worm shaft and also the rotary movement;

of the air-valve-reversing-gear 2/1, which gear, by the calculated length of the slot 24*, will throu'glrthe wrist pin 25*, occasion such calculated throw of the connecting rod 25 as, through the crank shaft connection the consequent calculated rotary movement of the tapered valve 73 within the valve casing 72. v

In Figure 8, I have shown a stuffing box connection for the valve, with the nipple or inlet end-75 through which the motive fluid from the source of supply enters within the hollow tubular interior 76 of said valve. and this stufling box which is intended to permit of the rotary movement of the valve body relatively to the nipple or inlet member 75 is conveniently of the following construction:

77 is a hollow threaded cap stufling box, which by means of its threads is securely aflixed to'the threaded outlet end of the tapered body 73 of the valve, and which serves within its hollow extended interior to confine the packin 78 against the outer wallof the nipple en 75, which nipple end is at its inner end formed with a flange 79 upon which the packing 78 rests and is forced down by a tubular thimble 80 which surrounds the nipple end and is itself held in placeby a compression cap 81 screwing upon the outer threaded wall ofthe threaded stuffing box 77.

By this means the entire stufiing box constitutes a swivelling expansion joint for the rotary valve casing.

The retentionof the valve proper 73 with relation to the casing 72 is conveniently eifected by the compression of a nut 82 which forces 'a washer 83 down 11 on the end of the valve casing, as shown in igure 8.

As already explained, this valve is preferably an eight-way valve, although two :four-way valves properly mounted and applied would perform a similar function, and it is illustrated in detail by a comparison of the sectional views Figures 9, 10 and 11 and 12 with the view of Figure 8.

The function of this valve in the oscillatory rotary movement imparted to it by the reversing gear 24, is four-fold :--first,-to sup ply motive fluid to depress the-vertical pistons to secure the tube in position upon the machine to have both of its ends simultaneously milled ;second, to supply motive fluid to propel outwardly 1 and oppositely towards each other, the horizontal'pistons so as to force the milling heads against the ends of the tube to be milled,this operation taking place while the vertical pistons are serving to hold the tube in position";third,- to supply motive fluid to propel inwardly and away from each other the horizontal pistons so as 'to release the milling heads from against the ends of the tube after it has been milled,this operation taking place while the vertical pistons are still serving to secure the tube in position;and, fourth to supply motive fluid to elevate the vertical pistons so as to lift and release the tube -from its secured position upon the machine so as to permit 0 the machine.

Of course, in the performance of these successive functional and cyclical steps of the operation, the motive fluid must be first simultaneously let into the larger pressure areas within both of the vertical cylinders, and forthe time being and after it has served downwardly to propel the vertical its movement away from pistons must be retained within said cylinders'before the lead is given to the exhaust from their larger pressure-areas;then, the motive fluid must be simultaneously let into the larger pressure areas within both of the horizontal cylinders so as topropel the pistons outwardly and must be retained therein until the milling heads have done their work before the lead is given to the exhaust from said larger pressure areas of said horizontal cylinders ;-.-,then, the lead being given to the exhaust from the larger areas of said horizontal cylinders, the motive fluid within the smaller pressure areas of said cylinders will occasion the reverse movement of the pistons to withdraw the milling heads and, lastly, the lead beinggiven to the exhaust from thelarger pressure areas of the vertical cylinders, the motive fluid within the i smaller pressure areas of said cylinders will performed, by the oscillation,

occasion the upward movement of the vertical pistons successively to lift and release the tubes after their heads have been milled.

Each one of the foregoing successive steps of operationis effectually and satisfactorily predeterminedly controlled of my eight-way valve, and a reference tov the sectional views of Figures 9, 10,11and 12 of my valve, and to the diagrammatic view of my motive fluid pipe system shown in Figure 2, will indicate the different positions which the valve assumes in controlling the motive fluid to the above described ends.

Referring toFigu're 2, I have, for clearness, used the letters a, a,'a and a, and

, inclusive.

also the letters 7), b, b and b, to designate the motive fluid-pipe lines which respectively connect with t e several ports of the valve .cylinder 72 whichare respectively indicated -in the planes of thedotted lines 9-9 and attests of the casing,' Figure -10, which ports, re spectively, are connected with the pipe line a and a, so that the motive fluid entering the-tubular interior 7 6 of the valve will simultaneously flow through the pipe lines a and a to the larger pressure areas 48 of the vertical cylinders to depress their pistons,while, simultaneously, the ports 0 and 0 of the valve (Figure 9) will be in registry with the ports 03 and d of the casing, which ports, respectively, are connected with the pipe line b and b and with the exhaust ports (1 and d Figure 9,-so that said pipe lines b and b will be exhausting.

While the foregoing operation or movement of the motive fluid is taking place by reason of the positioning of the ports represented in'Figures 9 and 10, the ports which connect with the pipe lines other than a, a

and b and b", will be in the positions reposition of the valve in which certain of the inlets and certain of the exhausts are out Of service or. in neutral positions, so to speak.

The second operation which is thatof supplying the motive fluid simultaneously to the larger pressure areas 68 of the two horizontal cylinders, so as to propel inwardly and oppositely the horizontal pistons to drive the milling heads into action, takes place when the valve is in the position represented in Figure 9, in which the inflowing motive fluid which is to feed .the pipe line a? I and a and close the pipe line b and b as well also to permit of the exhaust through the .pipe lines 6. and 1), passes to said pipe lines a and a and through them, as indicated in Figure 2, into the larger pressure areas 68 of the horizontal cylinders.

Obviously, thatthis operation may take place, the closing of the flow into the vertical cylinders must be 'eiiected and the exhaust therefrom neutralized.

During this operation, therefore, while lines a and a and lines I), b are open, lines a, a and b b, are closed, a result directly due to such placement of the valve as is represented-by its position in Figure 10.

The third operation which is. that of exhausting the motive fluid from the larger pressure areas 68 of the two horizontal cylinders so as'to permit the motive fluid within the smaller pressure areas 51 of said cylinders to operate to propel outwardly and oppositely away from each other the horizontal pistons to retract the milling heads from the ends of the tube, takes place when the valve is in the position represented gamma exhaust from. the larger areas 68 of saidcylinders, while the pipe lines a, a and Z2 b are closed by reason of such placement of the valve as will occlude both inlet and exhaust ports, for the time being as such, of said pipe line.

The fourth operation which is that of supplying motive fluid simultaneously to the smaller pressure areas 49 of the two vertical cylinders so as to permit of the elevation of the vertical piston and the lifting of the tubes from the machine, while permitting the exhaust from the larger ressure areas 48 of said cylinders, takes p ace when the valve is in the position shown in Figure 11,-

in which the motive fluid is flowing through the pipe line b and b and exhausting through the pipe lines a, a, while at the same time the pipe lines of, a? and b, b,- are closed by the then placement of the valve' with respect to its other inlet and exhaust ports.

Of course, the foregoing operations may be performed in the predetermined and desired order by a valve of a. different character than the precise eight-way valve I have shown and described,or it may be performed by two four-way valves,b-ut' that which is material is the performance itself, and I do not, therefore, desire to limit myself'to the precise form of valve organization as applied to a pipe-line motorflurd system such as I have typically represented as connected with the two vertical cylinders and the two horizontal cylinders.

Thus, while I have shown my valve as geared through the connection of the airvalve-reversing-gear 24, itself operating through-the worm shaft 33 and worm 35 from a direct connection with the driving shaft 8, itself controllably driven from the motor,with the system of levers and rods 25, 25", 25 25 25' and 25*, I 'do not confine myself to such a connection, because my broad idea is simply to control a valve connected with a pipe line system for a motive fluid supply and control, by means so timed,'if not directly connected with'the driving mechanism of the milling heads, as will ensure the proper cyclical movement of the several pistons with respect to the movements of the milling heads.

Thus, further, my invention is broad enough to comprehend any means for the desired predetermined control of the movements of the several pistons with relation to the movements of the milling heads.

I believe, of course, that a motive fluid supply under proper valve control is the practical and best way of doing the work, but I do not confine myself to it as the only means by which the several pistons may be co-ordinately operated,-any more than I desire to limit myself to a reverse movement, as opposed to a direct or similar movement, of tphe milling head shafts and milling hea s.

These details do not reach the essence of the invention and are obviously within the judgment of the constructor.

It will now be apparent that I have devised a novel and useful construction of a tube milling machine, which embodies the features of advantage enumerated as de sirable in the statement of the invention and the above description, and while I have, in the present instance, shown and described apreferred embodiment thereof which will be found in practice to give satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is 3- 1. In a machine of the character stated, means for clamping a tube in position to be milled, oppositely rotatable devices for milling the ends of said tube, and fluid pressure controlled mechanism for advancing and retracting said milling devices with respect to the ends of said tube.

2. In a machine of the character stated, means for clamping a tube in position to be milled, devices for milling the ends of said tube, and fluid pressure controlled mechanism for advancing and retracting said milling devices with respect to the ends of said tube.

3. In a'machine of the character stated, fluid pressure controlled means for clamping a tube in position to be milled, devices for milling the ends of said tube, and fluid pressure controlled mechanism for advancing and retracting said milling devices with respect to the ends of said tube.

4. In a tube-milling machine of the character described, the following elements in combination :a framework which embodies alongitudinal bed,means for successively feeding to said bed tubes to be milled,-means for receiving above the bed each tube as fed, fiuid pressure actuated means for securing it in position to have both of its ends simultaneously milled,-means upon the bed for simultaneously milling both ends of a tube as received and secured in position above said bed,means for actuating the milling ineansto efi'ect their operation simultaneously but in reverse directions upon both ends of a tube,--and means for successively releasing the tube-securing means to permit of the successive removal of each milled tube from the machine.

5. In a tube-milling machine of the character described, the following elements in combination :a framework which embodies a longitudinal bed,--means for successively feeding to said bed tubes to be milled,- means for receiving above the bed eachtube .as fed, fluid pressure actuated means for means to effect their operation simultane- 'ouslybut in reverse directions upon both ends of a tube,and means for successively releasing the tube-securing means to permit of the'successive removal of each milled tube from the machine.

6. In a tube-milling machine of the character described, the following elements in combination :a framework which embodies a supporting bed,-means for successively feeding to said bed tubes to be milled,g'uttered clamp blocks upon the bed to receive the tubes as fcd,-fluid pressure actuated means to secure the tubes upon said clamp blocks,separated milling heads, oppositely disposed upon the bed in axial lignment with each other, to mill the en s of the tubes,- --means for reversely rotating the milling heads,--and means for successively releasing the tube-securing means to permit of the removal of each tube from the ma chine.

7. In a tube-milling machine of the character described, the following elements in combination :a framework which embodies a supporting bed,--means for successively feeding to said bed tubes to be milled,- guttered clamp blocks upon the bed to receive the tubes as fed,fiuidpr essure actuated means to secure the tubes upon said clamp blocks,-separated milling heads,

. oppositely disposed upon the bed in axial alignment with each other, to mill the ends of the tubes,means for endwise, longitudinal, relative adjustment of the milling means,means for reversely rotating the milling heads,--and automatic means for removing the tubes from the receiving means, and automatic means for discharging the milled tubes from the machine.

8. In a tube-milling machine of the character described, the following elements in combination :a framework which embodies a longitudinal bed,-means for successively feeding to said bed tubes to be'mi'lled,-

means for receiving the tubes to be milled on the bed,-fiuid-controlled means, for securing the tubes upon the receiving me'ans, means upon the bed for simultaneously and reversely milling both ends of the tubes,- fluid-controlled means for forcing into awaits cessively feeding to said bed tubes to be I milled,mcans for receiving'the tubes to be milled on the bed,fluidcontrolled pistons for securing the tubes upon the receiving means,milling heads oppositely disposed upon the bed in axial alignment with each other,means for rotating said milling heads in reverse directions,-fluidcontrolled pistons for-forcing into action the milling heads,means for successively releasing the tube from the receiving means,a'nd means for successively discharging the milled tubes from the machine.

10. In a tube-milling machine of the character described, the following elements in combination :a framework which embodies a longitudinal bed,--guiding devices upon which tubes are placed to be delivered to the bcd,tube-receiving devices upon a which the tubes are successively placed from I the guiding devices,a pair. of vertical cylinders erected upon and near the ends of the bed above the tube-receiving devices, and each provided with a vertical piston carrying clampingmeans for securlng the tubes upon the tube-receiving devices,-a pair of horizontal cylinders erected upon and near the ends of the'bed beyond the receiving devices and the vertical cylinders, and each provided with a horizontal piston provided at its outer end withv a milling head,milling heads axially-aligned with the horizontal pistons and rotatably connected therewith,-means for occasioning the predetermined cyclical operation of the vertical pistons and of the horizontal pistons,and means for occasioning the rotation of the milling heads.

11. In a tube-milling machine of the character described, the following elements in combination :a framework which embodies a longitudinal bed,.means by which tubes are successively delivered to clamp blocks upon the bed,--clamp blocks upon the bed,--a pair of oppositely disposed, correspondent, vertical cylinders erected upon the bed near the ends thereof and beyond the clamp blocks,vertical pistons within the vertical cylinders, provided at their downwardly-extending ends with clamping blocks which co-operate with the .clamp blocks on the bed to secure a tube in inders,-horizontal pistons within the hori-' zontal cylinders, provided at their outwardly-extending ends with milling headshafts in alignment and rotatable connection therewith,milling head shafts,-milling heads connected with the outer ends of the milling head shafts,fluid-controlled means for occasioning the predetermined cyclical operation of said vertical pistons and said horizontal pistons,and means for occasioning the rotation of the milling heads.

12-. In a tube-milling machine of the character described, the following elements in combination z-a framework which embodies a longitudinal bed,means by which tubes are successively delivered to tube-receiving means upon the bed,tube-receiving means upon the bed,a pair of vertical cylinders erected upon and near the ends of the bed above the tube-receiving means, and provided with tube-releasing devices,vertical pistons within the vertical cylinders, provided 'at their downwardly extending ends with clamping devices whic co-o erate with the tube-receiving means on the ed to secure a tube in position,-a pair of oppositely disposed, correspondent, horizontal cylinders erected upon and near the ends of the bed beyond both the tube-receiving means and the vertical cylinders,- horizontal pistons within the horizontal cylinders, provided at their outwardly extending ends with milling head shafts connected with them in rotatable and aligned relationship,milling head shafts,--milling heads connected with the outer end of the milling head shafts,-means for occasioning the opposite rotation of the milling heads,--and fiuid controlled means for oc-' casioning the predetermined cyclical operation of said vertical pistons and said horizontal pistons.

13. A tube-milling machine of the character described, in which are combined with a supporting. bed,means for successively feeding tubes to be milled,--means for receiving each tube as fed and securing it in position to have both of its ends simultaneously milled,-means for simultaneouslymilling both ends of a tube as secured in position,means for successively removing from the machine each milled tube,-and a fluid-controlled means for occasioning the predetermined cyclical operation of the means for receiving and securing eachtube, of the means for simultaneously milling both ends of the tube and of the means for successively removing from the machine each milled tube.

14. A tube-milling machine of the character'described, in which are combined with a supporting bed,means for successively delivering to said bed tubes to be mi lled. tube-receiving devices upon the bed,tubemilling devices,-oppositely disposed vertical cylinders,-vertical pistons within said cylinders provided with means for clampmg the tubes upon the. tube-receiving devices,oppositely disposed horizontal cylin-' ders-horizontal pistons within said cylinders provided with tube-milling devices,and, fluid controlled means for 00- casioning the predetermined cyclical operatlon of said vertical pistons and of said horizontal pistons.

15. A tube-milling machine of the character described, in which are combined with a supporting bed,means for successively delivering to said bed tubes to be milled,- tube-receiving devices upon the bed,tubemilling devices,oppositely disposed vertical cylinders,pistons within saidcylinders provided with means for clamping the tubes upon the tube-receiving devices,op-.

positely disposed horizontal cylinders,- horlzontal pistons within said cylinders provided with tube-milling devices,-fluidcontrolled means for occasioning the predetermined cyclical operation of vertical pistons and of said horizontal pistons,-and means for rotating the tubemilling devices.

16. A tube-milling machine of the character described, in which are combined with a supporting bed,means for successively delivering to said bed tubes to be milled,-

tube-receiving devices upon the bed,tubemilling devices,oppositelv disposed vertical cylinders provided with tube-releasing devices,'vertical pistons within said cylinders provided with means for clamping the tubes upon the tube-receiving devices.oppositely disposed horizontal cylinders,- horizontal pistons within said cylinders operating to rotate; the tube-milling de- 'vices.-and fluid-controlled means for ocpredetermined cyclical operation of said vertical piston and of said horizontal pistons-and means for rotating the tubemilling devices. w I p 18. A tube-milling machine of the character described, in which are combined with a supporting bed,means for successively said l delivering to said bed tubes to be milIed,-- tube-receiving devices upon the bed,--tubemilling devices,op itely disposed vertical cylinders,-vert1cal pistons within said 0 linders provided with means for clamping t e tubes upon the tube-receiving devices,- I

' operation of the motive fluid, first upon the upper ends of the vertical cylinders, next, upon the outer. ends of the horizontal cylinders, nextu on the inner ends of the horizontal e lin ers, and last, upon the lower ends 0 the vertical cylinders.

19. A tube-milling machine of the character described, in which are combined with a supporting bed,-means for successively delivering to said bed tubes to be milled,- tube-receiving devices upon the bed,tubemilling devices,--oppositelydisposed vertical cylinders,--means for rotating the tubemilling devices,-vertical'pistons within said cylinders provided with means for. clamping the tubes upon the tube-receiving devices,op'positely disposed horizontal cylinders,horizontal pistons within said cylinders connected with the tube-milling devices,means for rotating said tube-milling devices,a valve controlled pipe line system in communication with a source of motive fluid supply, and connected'with both ends of the vertical cylinders and with both ends of the horizontal cylinders,a rotary eightway valve applied to said pipe line system and adapted in calculated order of admission and exhaust of motive fluid, to occasion the operation of said fluid, first, simulistons within said cylinders taneously upon the upper ends of the vertical cylinders, next, upon the outer ends of the horizontal cylinders, next upon the inner ends of the horizontal cylinders, and, last,

upon the .lower ends of the vertical cylin ders, as hereinbefore described,-and mechanism for occasioning the predetermined requisite rotation of said valve.

20. A tube-milling machine of the character described, in which are combined with a supporting bed,-means 'for successively deliverin to said bed tubes to be milled, tuberece1ving devices upon the bed,tubemilling devices,-oppositely disposed vertical cyl1nders,means for rotatingthe tubem1 lling devices,-vertical pistons within said cylinders provided with means for clamping the tubes upon the tube-receiving de-v vices,-oppositely disposed horizontal cylinders,--horizontal pistons within said cylinders connected with the tube-milling devices,means for rotating said tube-milling devices,-a valve-controlled pipe line system in communication with a source of motive fluid supply, and connected with both ends of the vertical cylinders and with both ends of the horizontal cylinders,a rotary eight way valve applied to said pipe line system and adapted in calculated order of admission and exhaust of motive fluid,to occasion the operation of said fluid, first, simultaneously upon the upper ends of the vertical cylinders, next, upon the outer ends of the horizontal cylinders, next upon the inner ends of the horizontal cylinders, and, last, upon the lower ends of the vertical cylinders, as hereinbefore described,and mechanism connected with the means for rotating the tube-milling devices for occasioning the predetermined requisite rotation of said valve.

I EDWARD H. CHAPMAN. Witnesses E. D. HUELMLE, M; R. Roan.

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