US1707421A - Metal working machine - Google Patents

Description

April 1929- I E. H. WILSON ET AL 1,707,421

I METAL WORKING MACHINE Filed March 1, 1926 11 ts-Sheet 1 INVIENTQRS 7%. flak Aw; W.

April 1929- E. H; WILSON ET AL 1,707,423

METAL WORKING MACHINE Filed March 1, 1926 ll s-Sheet 2 INVENTORS hw/mfim @Z WM;

April 2,1929. E. H. WILSON ET AL METAL WORKING MACHINE Filed March 1,

1926 11 Sheets-Sheet 3 INVENTOR 5 INVENTORS 11 Sheets-Sheet 4 vuvvvuyl a u l M n w April 2, 1929.

E. H. WILSON ET AL METAL WORKING MACHINE Filed March 1, 1926 p Win IIIIIIIIIIlIIlIIIlII/IIIIIIIIIIIIlIIM/MII/II/IIIflII/III 11 Sheets-Sheet 5 INVENTQRS Aprll 2, 1929. E. H. WILSON ET AL METAL WORKING MACHINE Filed March 1, 1926 April 2, 1929. E. H. WILSON ET AL METAL WORKING MACHINE 11 Sheets-Sheet 6 Filed March 1, 1926 Z 4 Z n u g is, 6 9 B B 7 B 6 M April 2, 9, E. H. WILSON ET AL 1,707,421

I METAL WORKING MACHINE Filed March 1, 1926 ll Sheets-Sheet 8 INVENTQRS April 2, 1929- E. H. WILSON ET AL 1,707,421

METAL WORKING MACHINE Filed March 1, 1926 11 ets-Sheet 9 I m i a I X I jmnnnnnhnnnnnnmpm mvsmoag, I WM,

A ril 2, 1929. E. H. WILSON ET AL 1,707,421

I METAL WORKING MACHINE Filed March 1, 1926 11 -Sheet 10 INVENTOIRS W QR mmw SN @ww m ma mmw mum gm mmw fir April 2, 1929.

E. H. WILSON ET AL METAL WORKING MACHINE Filed March 1, 1926 ll Sheets-Sheet ll Patented Apr. 2, 1929.

stars Uri l l sc-HUETTE, or recurrent, some SYLVANIA.

METAL-WORKING MACHINE.

Application filed March 1, 1926. Serial No. 91,386.

lire present invention relates broadly to the art of metal working and more particularly to an apparatus and method for the production of accurate threads on coupling-s, although the utility of the invention is not limited entirely to this field of operation.

in. the developmentof the art sand l a -luring couplings, the change from the use of wrought iron, ice-p welded, or butt welded couplings and the introduction oi coup}; formed from seamless tubes has been Accompanied by a esponding change in requirements with respect to the accuracy oi threads produced in the couplii is well known that considerable 'fitarlty is experienced, particularly with toe seamless tube method of operation, in the production of tubular articles having either a uniform wall thickness, or a truly circular bore or exterior. The irregularities pre zt in ditlereut al 'clcr' have heretofore inzue it alm st impossible to produce accurate threads in the opposite ends of coupl of such nature as to insure proper alignment.

v e. l t

of adjacent lengths of pipe, tube or thread d into the couphn lVhc-re the are intended for use in the voil e like, i will be apparent that e ,reme importance as in a casing length of several thousand a small 106i variation becomes considerably n'iultiplied.

licretoiore, where seamless couplings have been used t has been necessary to carefully sect as couplings betore attempting to thread t "3 same, in an etl ort to reject blanks having; too great variation in different l ins of the roll thickness. Not intrequently this variation is as much as 12 7 "t or of the nominal. wall thickness in large sired blanks. In such cases, the blanks have been pped it has b en considered impos re with known apparatus to produce accurate threads thereon.

Another difficulty encountered has arisen by reason of the comparatively high carbon content in such blanks, .vhereby local conditions of hardness are frequently set up either by reason of air currents or the local application of water, thereby either the boring bar or out of its true course.

The present invention has for one oi? its objec the prod improved appa stirs capable of operating on blanks hav ing a wide variation either in wall thickness tending to deflect or structural characteristics, and producing accurate threads thereon.

in the accompanying drawings there is shown for purposes of illustration only a preferred embodiment of the present invenlion, it being understood that the drawings do not definethe limits or our invention changes in the construction and operation sed therein may be made without deeither from the spirit of the invention or scope of our broader claims.

In the drawings:

liigure 1 is a side elevation of a machine embodying the present invention;

Figure 2 is a front view of the machine shown in Figure 1; v

Figure 3 is a top plan view of the construction of Figures 1 and 2, the cover for the ear housingbeing omitted; V

'gure l is a vertical sectional View, With certain of parts being shown in elevation, on the line I V V of Figure 3 looking in the lirection o f the arrows;

is vertical sectional view simia lar to Figure 5 but taken'on the line VlI- igure (3 and looking in the direction of the arrows;

Figure 8 is a top plan view illustrating one form of mechanism for ellecting mechanical movement of the chuck table;

Figure 9 is a vertical sectionzil view on the line lXlX of Figure 8 looking in the direction of the arrows;

Flgllle 10 is a side elevation, partially broken away and partially in section, of the construction shown in Figure 8;

Figu're 11 is a vertical sectional view on the line Xl-Xl of Figure 10 looking in the direction of the arrows;

Figu e 12 is a sectional View, partially in elevation and partially broken away, the view being on an enlarged scale through one of the chuck trunnions and illustrating the construction thereof;

Floors 113 is an end elevation of the construction shown in Figure 12;

Figure l l is a top plan view partly broken away and partly in section of too construction of Figures 1:2 and 18;

Figure is a View similar to Figure 12 a vertical sectional view on the VV oi Figure 6 looking in the 'direc ly broken away and partly in elevation for the purpose of illustrating one formof indexing mechanism for the chuck table;

Figure 19 1s a top plan view of the indexing mechanism of Figure 18;

Figure 20 is a diagrannnatic view of the indexing mechanism illustrating the position of the indexing pin at the commencement of movement of the chuck table;

Figure 2]. is a view similar to Figure 20 illustrating the position of the indexing pin at the time the chucktable approaches the limit of its movement;

Figure 22 is a detail view partly in section and partly in elevation illustrating the arrangement of control shafts, levers and sleeves in accordance with the machine shown in the drawings;

Figure 23 a view similar to showing the reversibility of the control mechanism wherel y the operating handles maybe located at the opposite side of the machine from that shown in the drawings; and

Figure 24 is a diagrammatic view illustrating a slightly modified embodiment of the invention.

In producing a boring and tapping machine of the general character contemplated herein it is of the utmost importance to so construct the machine that a predetennined accurate relationship exists at all. times be tween. the holding chucks and the operating spindles. In accordance with the present- Twention this is preferably accomplished by providing chucks of a semi-floating nature adapted to be supported by seats accurately machined relatively to the axis of rotation of the respective spindles with which they cooperate. In this manner, a predetern'iined relationship between the axis of the spindles and the chucks is insured. This may be accomplished broadly by sup- Figure 22 porting the chucks in a rotatable table of such construction that the table may be bodily raised to remove the chucks from their supporting seats, rotated to a position to bring the chucks into cooperative relation with new seats, and then lowered to bring the chucks into engagement with such seats.

In carrying out the present invention there may be provided a machine of suitable const-ruction having a base plate 2 carrying a supporting framework 3 projecting upwardly therefrom. Carried by the base 2 is a gear housing 4 containing a gear train 5 and a gear train 6. For driving the gear train 5 there may be provided a motor 7, while a similar motor 8 may be utilized for driving the gear train (3. As illustrated more particularly in Figure 4, the gear train 5 is operative, as for example, by means of bevel gears 9 for driving a vertically extending shaft 10 extending upwardly through the f Tame 3 and carrying at its upper end a bevel gear 11 meshing with a similar gear 12 on. a horizontally extending shaft 13 in the upper portion of the frame. The shaft 13 is in turn adapted to drive a sleeve .14: by means of bevel gears 15. The

at its lower end for the attachment ot a suitable tap 19 although any other form of construction may be utilized as desired.

The gear train 6 in turn adapted through mechanism similar to that hereiin before described in. detail for the tapping spindle T, to drive a boring spindle B similarly mounted within an upper bearing 20 and a lower bearing 21. At its lower end the boring spindle B is provided with a coupling flange 22 adapted to have secured thereto a suitable tool 23 eii'ective for initially boring or cutting the coupling blanks to the desired size preparatory to the performance of the threading operation therelVith the exception of the particular con struction of the operating tools carried by the two spindles, their construction and operation may be similar. \Vhere the spindles are of tubular construction, as is preferably the case with large installations, the upper ends thereof may conveniently be constructed as illustrated in detail in Figure 17. In this figure a portion of the upper ends of the cavity within the tapping spindle T is shown as separated from the main body by means of an inset-table division plate'2i. Above this division plate the spindle may be filled to the desired extent with a suitable lubricant and is provided with an operating and suspending mechanism removable and insertable as a unit and held in position by means of a bushing 25. This unit mechanism may comprise an eye bolt body 26 shaped to cooperate with an upper anti-frie tion bearing 27 and a lower anti-friction bearing 28. The lower race 29 for the hearing 28 may be supported on a plate 30 loosely carried by the body 26 as by means of a bolt 31 adapted when the unit mechasleeve lei. constitutes the immediate driving nism is inserted in position within the upper end of the spindle to rest against e shoulder 82 formed therein. The upper race 33 of the bearing 27 in turnceoperates with the bushing 25. Each of these eye bois tor the respective spindles carries an attachcase of teping eye elapted in t 1e spindle to be (191.1

by me ins of i- 35 to a lever 36 and in the case of the "mg spindle to be connected by means of a link 11 the lever 38 v secur d to :lO in the r i le e 36 for the tap in the fl'fl' no of the mechine.- The shaft 41 its outer end carries a collar 4t? from which there projects alcve: 48 from the outerend of which depend' an operating rod By b reason of this construction it will be e.

. 11 p out that by mating downwardly on the operzfi ng rod s the tapping spindle be l wered, r the operating rod may be lowered.

As a matter of opera" cesirable to have a co T may Vilill n lhng v(lownwar ily on the boring samdle B nstrucrion of such nature that the spindles normally tend to assume a positioi as illust in Figures rich CO1 rel, 2 and t of the d ax sponds to their noperative pos accomplishing th result, the sleeve 39 may have seci red thereto a second collar 50 from which projects a 51 connected by means ot a hnlr 52 to a counterweight 53 slidable In view of the massiveness of the 1nechanism adapted to be moved by the rods 4-iiind 49, and in view of the cherecteristics of the'counterweights, it is desirabl in many cases to provide mechanical means for assisting operzt r the lower'ng of the respective spindles, such means conveniently comprising mechanism effective for overs ed r V, eevc thereto a collar carry no icwi pio3ec mg iing depending theretroin an er, the lever 55 for the bor- .;ecured to u slee "e sicurerl and mounted in bearings For he i spindle, has a piston rod projecting i therefrom through a bearing 61 en 11 ed at it up 30:" end with a roller ed respectively to underlie the lei 51 and in such manner he, to tend to mo the in u 1 viewed in J igi,

T 1 it wilibe up: i and 5 may be ior operation 0 a li ind inc uiroinen in which used L tructed to c nders are s be operated itlea nection by air under pressure nor;

tion, it has been :tound 151 possible to mar ditions in an air line, and if for producing the upward move it o iei piston rods (30, the speed or movement wQ vary 111 accordance witl the air pressure available at that particular insta t. in ord 11 to obviate this objection, the cylinders in ouch conveniently comprise i hollow piston 63 carried by the rods 60 and moved downwardly by air p admitted through a suitable inlet as inui vied at 64 in Figure This d wnwurd moreopposed by the action of e pressure spring 65, the initial pressure of wiich may be controlled by an adjustment 66. c normal operation, air under pressure is 001 stantly adinl ted to both the cylinder 58 and 59 i'or n'iziintuining the pistons 63 in iowe positioi When it de: red to brine; eithe of thespindles into ope lt-U'Q position, tli i accomplished byso open. up; a. controlling" valve the air pressure line as to {)(ZHil t ie pressure within the respective cylin controlled thereby to be released, whereupon the spring 65 is effective for raising the ton and overcoming the inertia oi the Qni operetively connected LO the spindle which it desired to operate. in this manner the speed of movement of a given spindle can always be accurately pre letermined irrespective of any Vt riutions which may eiist thopressure of the air supply available.

It will be apparent that the parts ()iii the machine heretofore described may scouiutely assembled and thevbcerings the r the base 66 constitutes an inten'ral our; of

' pilot 72.

the main machine construction. The chuck table base 66 is conveniently constituted by a casting hollow throughout the main portion of its body in order to reduce the weight, and with suitable openings 0 to permit of chip and cutting lubricant disposal.

l ornied at the top of the use 66, and adjacent the base 2 in such position that their centers are in substantial alignment with the axes of rotation of the spindles are hearing flanges 68. Concentrically disposed with respect to each of the bearing flanges is an upwardly projecting bushing support 69, the top of the bushing support terminating in a plane below the top of the cooperating supporting flange (38. After the two bases are rigidly secured together, the respective spindles T and B are equipped with suitable cutting tools adapted to accurately'machine the supporting flanges 68 and the bushing supports 69 whereby the desired accurate relationship will exist with respe t to the rotation of the spindles, the supportflanges and the bushing supports. This feature of machining the parts referred to in the chuck table base by means of the tapping and boring spindles respectively constitutes an important feature of the present invention, as by reason thereof much greater uniformity is obtainable than has heretofore been considered possible.

After the parts 68 and (39 in the base 66 have been machined as referred to, they are ready to receive hardened bushings. A bushing 70 is accordingly fitted in each of the supporting flanges 68 while a bushing 71 is fitted within each of the bushing supports 69. It will be noted that each of the spindles is illustrated as being provided with a The bushings 71 constitute pilot bushings; and are accurately machined to receive and support the respective pilots during the operations of boring or tapping.

Centrally carried by the chuck table base a cylinder support 73 adapted to receive and support a cylindrical member 74 constituting a portion of a table elevating mechanism. Fit-ted within the upper portion of the member 74 is a sleeve 7 5 adapted to cooperate with the upper reduced portion of a piston 76. lVithin the lower end of the member there is located the piston head 77 preferably carrying suitable packing rings 78 as understood in the art. The piston is adapted to have a limited stroke as dctern'iincd by the position of the lower end of the sleeve 75, and. thisstroke may be obtained by supplying any desired fluid under pressure, this fluid conveniently being conducted through. an inlet 79 into a passage 80 in the lower end of the member 74 and from this passage in turn through a port 81 into the bottom of the cylinder, the cylinder being closed by a suitable plate 82.

Rotatably mounted within the piston 76 preferably on anti-friction bearings 83 is a piston rod 84, the piston rod being constructed for vertical movement with the piston and rotational movement independently thereof. For preventing a leakage of the actuating fluid around the piston rod, the piston may be prouided with a sealing plate 85 on its lower end. Adjacent its upper end,

the piston rod may be provided with a shoul der 86, with which one .of the bearings 83 may conveniently cooperate, and serving to support a chuck table 87 mounted on the piston rod. After the chuck table has been positioned on the piston rod, it may be clamped thereon by means of a suitable washer 88 and screw 89, the piston rod and table being secured against relative rota tional movement in any desired manner as well understood in the art.

By reason of the construction.described, it will be apparent that an operator at will may supply fluid under pressure to the chuck table raising cylinder and thereby elevate the entire chuck table. The present machine is designed in such manner that the table will be elevated upon completion of each operation upon a coupling carried thereby and rotated while elevated to bring a new coupling into position. Upon completion of the rotation, the table will be lowered to again permit the performance of the desired operation on the coupling or couplings carried thereby. By means of this table movement, an accurate centering of the chucks is obtaincd as will be more fully pointed out hereinafter.

Referring more particularly to Figure 6 of the drawings, the chuck table 87 is illustrated as being provided with four chucks a, b, c and (Z- respectively. Each of these chucks comprises a plurality of jaws 90 carryingcoupling gripping means 91. These jaws 90 are mounted for movement in known manner within a chuck ring 92 carrying diametrically opposed trunnions 93 and 94 about which each of the chucks is bodily rotatable. Each of the jaws 90 is also preferably provided with stops {)5 limiting the insertion of a coupling between the jaws,

thereby accurately centering the same and maintaining the two ends in such position that they will effectively cooperate with respective spindles upon operation of the machine.

A separate bearing 96 is provided for each of the trunnions 94 on the chuck rings and another bearing 97 for each of the trunnions 93, these hearings being arranged in pairs nion threads in the couplings. Referring more particularly to Figures 15 and 16 in which one of the bearings 96 is illustrated in detail, it will be noted that the chuck table 87 is shaped to provide a series of depressions 98 equ-idistantly spaced and adapted each to cooperate with a cap 99 to form bearing. Each of the caps 99 embodies a transversely extending. upper portion 100 and vertically extending sides 101 constituting slides or guides for each of the chucks. As apparent from Figure 16, the overall width of the lower portion of the sides 101 is lessthan the width or" the corresponding recess 98, whereby a cap 99 may be placed in position and accurately adjusted back and forth to secure true centering of the chuck. Thereafter dowel pins 102 maybe utilized for tying each of the caps accurately in place, the holding being assisted by cap bolts 103.

Vertically sli'able within the side guides 101 are slicing bearings 101- each carrying bushing 105 within which the trunnions 9 1 rotate. These trunnions, as clearly pparcn't from Figure 15, are in turn hollow and carry sleeves 106 having internal threads 10? which coope ate with adjusting screws 10?; provided for the adjustment of he inner 90 of each chuck. The outer ends of the screws 108 may be squared indicated at 109 to facilitate the application of a wrench tl'iereto for adjusting the same and they may be held in adjusted position by lock nuts 110. The inner ends in turn may be provided withheads 111 adapted to lit within suitable recesses within :the jaws there beingprovided brackets 112 for m.. I the heads in cooperative relation with the jaws and for insuring; movement of the jaws in unison with the screws.

In Figures 12 to 1e both inclusive there is illustrated in detail one the bearings 97 cooperating with one of the trunnions 93. The table 87 adjacent its periphery is provided with recesses 113 similar to the recesses 98 and adapted to cooperate with caps 11 1 similar in construction and mounting to the caps 99. Slidable within each 01 the cups 114% is a slidable bearing 115 carrying a bushing 110 within which rotates a trun- Each oi these trunnions 93 is in turn hollow and is provided with a sleeve 117 having internal threats 1'18 adapted to crm iierate with a. screw 119 termed on the hand wheel shaft 120. trimnions 93 there is also provided a second sleeve 121 having an internal diameter preterably substantially equal to the outside .-.ineter'of the screw threads 1 whereby the screw shalt may be bodily slipped into position. Carried on the outer end of each ew shaft 120 and movable outwardly and.

'rdly therewith is a hub 122 carry' ers .e I by means G1. which the screw raining lVithin each 01" the shafts may be rotated to move the corresponding aw inwardly or outwardly. Each '01 the screw shafts 120 has an inner head each of these indexing disks having a pair diametrically disposed notches 127 formed therein, these notches bearing a predetermined relationship wi'threspect to the chuck 92 whereby with the chuck rings in tanti'ally horizontal position one oi the notches will be in a position to cooperate with a latch 128 having a pivotal mounting 129 in the sliding. bearing 115. This latch is provided with a release finger 130, and normally urged in a counter-clockwise direc tion, as viewed in" Figure 12', and into latclr ing positionby a suitable spring 131. By reason of this constructionit will be apparthat eachchuck, upon releasing its latch 128, may be rotated through substantially 180 degrees whereupon it will be auto iatically' indexed in substantially the desiredposition by its latcli' 128.

In actual operation of the machine, upon elevation of the chuck table 87, the sliding 104C and 115 in the bearings 96 and 97 respectively move vertically in the caps for a distance determined by the vertical movement imparted to the table; By reference more particularly to' Figures 5, 12 and 15, it will be noted that each of the chuck rings is provided on its upper and lower surlaces will accurately machined seats 132. ose seats 32, with the table in lower po- 'on, are adapted to engage the bushings 70, which bushings are thereupon efi'ective 'i'or determining the final position o1 the chucks. Fhis is true for the reason that'after the seats 13 engage tne respective bushings 70, the lowering movement 01' the table continues to an extent suilicient to provide a substantial space 133 between the table and the respective sliding bearing clearly shown in Figures 12 and 15. In this manner, the table itself is relieved of any centering operation with respect to the chucks, this operation being; thrown entirely upon accurately machined surfaces carried by the 05 which is in turn so machined, by the spindles illGIDSGlVOS, as to insure absolute accuracy. It will be understood that the bushings for the chuck rings, as well as the bushings 71 tor the pilots, may be either formed by the spindles or by a separate machining operation on lathes, it being possible with careful lathe work to produce seating surfaces accurately conforming to the supporting ilanfes 68 and the bushing supports 69. Vi e have found that by thus entirely relieving the rhuck table of the. duty of accurately pesiioning the ch-uclzis, and imposing this so mount the table that it may be turned freely enough by hand, but the repeated turning imposes, in many instances. an unnecessarily heavy duty on the machine operativef In order to obviate this objection, there may be provided means either for mechanically and intermittently moving the table as desired throughout its complete range of movement, or throughout only a portion of this movement. In Figures 8 to 11 both inclusive there is illustrated one form of mechanism which may be utilized for effecting this table movement. Assume a condition in which the table is adapted to rotate in the direction of the arrow 134 of Figure 10. Under such conditions, dependin upon the number of chucks carried by the table, there will be provided a number of projections 135, these projections corresponding in number to the number of chucks. Adapted to successively cooperate with the projections 135 is a vertical movable table moving pin 136 normally urged upwardly by means of a spring 137 but provided with a curved rear face 138 adapted to permit a projection to freely ride over the pin and push it downwardly as may be required. The pin 136 may be held against rotation in its guide 139 by a suitable key 140, the guide 139 in turn being carried by a crosshead 14]. slidable horizontally in guides 142. This sliding movement is adapted to be produced by a piston 143 movable in a cylinder 144, the cylinder being mounted in fixed position by a bracket 145. Under normal conditions of operation, fluid under pressure is admitted to the cylinder 144 through. a port 146, thereby urging the piston 143 to the left against the action of a compression spring 147 as clearly shown in Figure 10. lVhile the fluid under pressure might be utilized for producing the working stroke of the piston, as pointed out in connection with the cylinders 58, such an operation preferably does not take place for the reason that this air pressure is subject to a wide variation. For this reason, when it is desired to initiate a table movement, the operator, after having first lifted the table by operation of the piston 76, releases air pressure from the cylinder 144 pern'iitting the spring 147 to start movement of the table. The stroke of the piston 143 is preferably less than that required for a complete table movement so that at the time the table approaches the limit of its movement it 1s tree from any operating mechanism. It has been found in actual practice, that by imposing the initial move- I ber 74 and adapted to normally ride on the lower surface of a flange 149 formed on the table. This flange, however, is provided at intervals with cut away portions adapted to receive the pins 148 as clearly shown in Fig ures 15 and 16. lVith such a construction, the table is held in elevated position once rotation has started until substantially the final movement of the table is obtained, whereupon the pins 148 come into registration with the cut away portions in the flange .149 and permit the table to drop. This cons ,itutes a crude indexing means for the table as well as a safety appliance.

In the interest of accuracy which the present machine is designed to obtain, it will be obvious that the bushings and the seats 132 must be so accurately i'i'iacliinet as to reduce the possibility of clearance therebetweei'i to a minimum. Even with this small clearance, however, it is neces sary to produce an indexing operation much more accurate than that which can be obtained by the pins working on the compai':-itively small diameter represented by the flange 149. For accomplishing this accurate indexing of the table we may utilize a mechanism as illustrated in Figures 18 to 21 both inclusive. "he"construction is illustrated in Figure 18 as applicable to a table moving in the direction of the arrow 150. Figure 18 is illustrative of the table in its accurately indexed, posit-ion, Figure 20 is a view illustrating the table at a mid point in its rotation and Figure 21 is a view similar to Figure 20, both of these views being largely diagrammatic, and illustrating the position of the liiarts as the desired po is apprmiched. This indexing mechanism for the table may comp ise a sleeve 151 carried by the chuck table base 66 and suitably secured threto. Vertically slidable within the sleeve 151 is a locking and indexing pin 152 which is norm-ally urged upwardly by a spring 153 which cooperates with an adjusting device 154. The upper end of the pin its forward surface 155, extending in the direction of rotation of the table in- Oll lie

clined upwardly and rearwardly, while its back face provided with a hardened steel wear plate 156. The entire pin may be held against rotation in the sleeve 151 by a suitable key 157 whereby recipropation in the desired plane is insured.

The table at equidistantl-y spaced points, the number of which depends upon the number of chucks, carries'aseries of indexing plat-es 158 each of which is formed with a recess 159 shaped to ac c rately cooperate with and receive the upper end of the indexing and locking pin. The rear face ott each of the recesses 159 is preferably formed by a hardened steel wear plate 160 similar in construction and operation to the plate 156.

After the combined indexing and locking pin is forced to the position illustrated in Figure 18, it is held in this position by a horizontal reciprocabl'e latch 161 having its inner end fitting within a groove 162 in a pin 152 and provided with a wear plate 163 cooperating with a similar plate 154 carried by the pin. The latch 161 is normally urged inwardly int-o operative position by a spring 165 abutting at one end against a shoulder 166 on the latch and at its opposite end against aninwardly directed shoulder formed in the cap 167 within which the latch slides. The latch is adapted to be moved outwardly against the action of the spring 165 by a bell crank lever mounted for movement about a bearing 168, one arm 169 of the bell crank lever being adapted to directly cooperate with the latch and the other arm 170 being pivotally connectedto a link 171 which in turn is pivotally connected to a lever 173 having a pivotal. mounting 174; on the sleeve 151. The outer end of the lever 173 may carry an antiiriction roller 175, this roller being so located that it is adapted to be engaged. by a cam 176 on the table, there being one of these cams for each of the latch plates 158. The latch is held. against rotational movement during reciprocation, to insure proper cooperation of the plates 163 and 16% in any desired manner as by key 177.

In actual operation of the machine, after an operation has been performed on the table, the table is raised from the position shown in Figure 18' to release it from the combined indexing and lo king pin 152. The pin 152 is prevented trom rising by reason of the latch 161. The table moving .iech-anism may now be energized to rotate the table in the direction of the arrow 150. After a predetern'iined amount of rotation, one ot the cams 176, as illustrated in Figure 20, will approach the roller 175, and upon continued movement of the table will press the roller and the lever 173' downwardly, shown in Figure 21 thereby rotating the bell crank lever inza clockwise direction and releasing the pin 152% Under the inwith' the chuck supported in one of the 3 mgs 70, and thereai ter the bored end or tlhence of the spring 153 the pin 152 jumps upwardly 'ito position preparatory to enteri the recess 159 inthe 1310310 158. This plate is provided with an inclined leading edge 158 which engages the upper end of the pin and moves it downwardly to an extent r quired to permit i to pass over the pin. As soon, however, as the recess 159 comes over tie pin, the pin enters the recess and by reason of the shape of the recess and the upper end of the pin, accu rately indexes the same and prevents any further movement. As the table is lowered at the completion of its rotational movement, the latch 161 again setso that the parts are in position for a succeeding operation.

Referring to Figure 3 of the drawings, the table 8'? is adapted to rotate in the direction of the arrow 178. This brings one of the chucks first under the boring spindle B and then under the tapping spindle '1. Under the boring spindle one end of th coupling is bored out to the desired size .1 the coupling is passed to the tapping spindle. The coupling is then tapped, while the chuck is seated in the other bushing 0, it being understood that during both the boring and the tapping operation the respective spindles are guided by the pilots T2 cooperating with the bushings 71. After the completion of the threading, which may have taken place concomitantly with the boring of another coupling in a tollowi chuck, the table is again rotated to position to bring the bored and tapped coupling out from under the tapping spindle; Thcreupon tthe chuck is rotated and the coupling again successively operated upon by the spindles. As each coupling is completed, it is released from its chuck, and a new coupling inserted in position in the. chuck.

It has been before pointed out that it is desired to normally maintain the spindles in their upper positions. While in such positions tree rotation of the table is porn ittcd without any danger of injury thereto or to the pilots. As a coupling C is brought into position beneath a spindle, however, it is necessary to lower the spindle to perform the desired operation thereon. This may be accomplished by providing an operating lever 179 adapted to control the lowering ill) of the boring spindle and a similar lever 7 80 adapted to control the lowering of the tapping spindle. In like manner there may be provided an operating lever 181 for controlling the manual release oi the boring spindle and a similar lever 182 for controlling the manual release of the tapping spindie. In. connection with these levers, their construction and. operation, attention is called. inoreparticularly to- Figures 1, 2, 4.-

2 and 28 of the drawings. In Figure 22 the frame 3 of l e machine is illustrated as being provided on opposite sides thereof with bearings 183 and 181 respectively, and with an intermediate bearing, 185. Extending transversely of the frame and through all of these hearings is a shaft 186 adapted to rotate at one end within the bearing 183 and at the other end within suitable bushings provided within a sleeve 187 which in turn rotates in the bearings 18% and 185. It will be understood that the shaft and sleeve are adapted to be individually and separately operated as found desirable. The outer end of the shaft 188 has secured thereto the operating lever 180 before referred to while the outer end of the sleeve 187 has secured thereto the operating lever 179.

Secured to opposite ends of the free portion. of the shaft 186 are levers 188, while secured to the opposite ends of the sleeve 187 are similar levers 189, the levers 188 and 189 respectively being adapted respectively for the operatioi'i of cams which control the mechanism for lowering the boring spindle and the tapping spindle. This mechanism is duplicated for each of the spindles, and comprises half-nuts 190, as clearly shown in l in'ure 1 ar lapted to be closed by cams 191 of Figure 1, the cams being provided with cam slots 193 cooperating with pins 194 projecting from the half-nuts. A pair of the ams 191 is provided for each spindle, as clearly indicated in Figure 2. Projecting upwardly from each of the cams is alug 195 with which cooperates link 190 secured to the lovers 188 or 89, before referred to. Upon pullingdown on the operating lever 17 9, the half-nuts-which control the tapping spindle will be closed, while upon similarly operating: the lever 180, the half-nuts'which control the boring spindle will be closed. Prior to the closing of the half-nuts, the cylinders 58 will have had the fluid pressure released therefrom. to permit the springs 35 therein to lift the counter-weights and lower the spindles into such. position that the threaded portions 197 thereon will be in position to be engaged by the half-nuts.

In Figures 1 and 1 the half-nuts are illustrated as being in closed position. Such an operation involves rotation of either the shaft 186 or the sleeve 187 in a ClUClllVll-IG direction as viewed in Figures 1 and 4-. The shaft 186 has secured thereto a spring, lever 198 while the sleeve 187 carries a similar spring); lever 199. As illustrated in Figure 1-, each of these spring levers cooperates with a tension spring 200, one end of which is directly secured to the lever and the opposite end of which is carried by a portion of the frame of the machine. Closing; of the half-nuts therefore places these springs under tension and accordingly the springs are normally urging'such a rotation of the shaft 186 or the sleeve 18.7 as to open the half-nuts. It is not desirable to require an operator to manually hold the parts in position against the action of these springs, and therefore the shaft 186 is provided with a catch lever 201 while the sleeve 187 is provided. with a similar catch lever 202. These catch lovers are adapted to cooperate with catches 20?) one of which is carried by a sleeve 201 in such position as to cooperate with the catch lever 202, while the other is carried by a shaft 205 rotatably mountedwithin the sleeve 20 1, and so disposed as to cooperate with the catch lever 201. The sleeve 20st and the shaft 205 are normally each rotated in a countor-clockwise direction as viewed in Figures 1 and 1 by means of springs 206, there being one spring each for the sleeve and the shaft. The springs 206 are normally effective for holding the catches 208 in such position that when the levers 179 or 180 are operated to close the respective halfnuts controlled. thereby, the catch levers 201 and 202 will be engaged by the catches and held in such position that the half-nuts are held closed.

It will be apparent that if this condition were continued for too long a period, the spindles would be lowered to such an extent as to loosen the couplings. In order to obviate the possibility of such an occurrence, there is provided automatic means for releasing; the catch levers. This means comprises a trip rod 207 for the sleeve 45 which controls the boring spindle and a similar trip rod 208 for the sleeve 39 which controls the tapping spindle. As the respective spindies are lowered, it will be apparent that the lov rs and 51 which control the counter-weights also move upwardly. As the trip rods are directly connected to these levers, a predetermined movement thereof in the upper direction will be effective for bringing the adjustable stop 209 thereon into contact with an. arm 210 projecting roarwardly one from the sleeve 20st and one from the shaft 205. This will tend to rotate either the sleeve or the shaft in a clockwise direc tion and accordingly move the catch 208 into a position to release the respective catch lever engaged therein. By adjusting the stop 209, the amount of feed of the boring spindle or the tapping spindle may be individually and accurately controlled.

At times during the operation of the machine an operator may see trouble ahead and desire to manually release the catch levers. This may be acoon'iplished by providing an operating lever 181 before referred to for the sleeve 201 and a second lever 182 for the shaft 205, these operating levers being effective in a manner similar to the op nation of the trip rods 208. 1 i

In some cases it may be desirable instead of providing a cylinder, such for example as the cylinder 58 or 59, operative merely for overcoming inertia of certain of the parts and initiating movement thereof, to provide means effective for i110 ing such parts to a predetermined position. In the illustrated embodiment of the invention, the spindles are moved freely a predetermineddistance, and are thereafter operated by means of threads which are engaged by the half nuts which aremoved into position to cooperate therewith. \Vith the cylinders 58, and 59 the spindles are merely given a start, and are thereafter moved to final position wherein the threaded portions may be engaged by the half nuts by a manual-operation. In Figure 24: there is illustrated a modified e bodiment of the invention in which parts. correspondine to parts heretofore described are designated by the same reference chemo-1 ters having a prime affixed there-to. This figure of the drawings merely discloses a form of cylinderv adapted to replace the cylinder 58., for example, of Figure 1. It will be apparent, however, that a similar cylinder may be applied to the' o-puosite side of a machine to replace the cylinder 59. v

In this modified embodimentthe lever 51 has secured thereto a link 2155,, one end of which is connected to the piston rod216 of the piston operable in the cylinder 217. The piston rod carries an adjustable stop! 218 adapted to cooperate with a movable stop 219. This movable stop is illustrated as comprising a lever having a pivotal mountin 220, one end of the lever eI'te-nding beyond the pivotal mounting and being bifurcated to straddle the piston rod forceoperation with the adjustable stop 218, while the opposite end extends rearwardly and is pivotally connected to a toggle link 221. The freeend of the toggle link 221 has a pivotal connection to a second toggle link 222 having a fixed pivotal mounting 223 a suitable point on the frame of the machine. The common pivotal connection of the toggle levers has operativelyconnected thereto a link 224 pivotally connected at its outer end to an inverted T-shaped lever 225. This T-shaped lever also has a fixed pivotal mounting 226 on the frame of the machine and is normally swung in a counter clockwise direction as viewed in this figure of the drawings by the action of suitable means such as a spring 227. The movement of the lever under the influence of the spring may be controlled by an adjustable stop 228 whereby the movement "ill be just sufllcient to bring the toggle links into line for holding the stop lever 219 in the desired position to cooperate with the adjus-nble step 218. The opposite arm of the '5 lever 225 has connected thereto a link 229 having an elongated slot 230, the bottom of which isformed by an adjustable stop 231. l' /orking the slot 230 is a pin 282 projecting outwardly from the lever 179 corresponding to the lever 179 before described, and controlling the operation of the half-nuts 190.

In the operation of ,theform of mechanism shown in Figure 2%, when it is desired to lower a spindle, fluid, or other operating medium, will be supplied to the cylinder 217 for moving the piston upwardly therein. This upward movementwill continue until the step 218 engages the stop lever 219 at which time further movement will be prevented. Thereupon an operator will manually lower the control lever 179 to close the half-nuts. At substantially the completion of themovement of. the lever 179 the pin 232 will engage the stop 231 and rotate the in verted T lever in a clockwise position to break the toggle and move the stop lever 219 to an inoperative position. In this position the spindle will be under the control of the half nutswhich will continue the movement thereof as before described. When the lever 17 9 is released at'the conclusion of: the operation of its cooperating spindle, the pin 282 will be permitted to move upwardly in the slot 230 whereby the inverted T lever will again be under the influence of. the spring 227 for straightening the toggle l nks and bringing the stop lever 219 into position for a succeeding operation. It will be apparent that the operating lever- 219 can not assume the position shown in Figure 24 until after such time as the stop 218 has moved to such a position that it will not interfere with this return movement. Thereafter; the parts are again in operative position for a sr'icceeding operation. Such a construction eliminates the necessity of any manual movement-of either of the spindles, and in many cases, particularly with large installertions, such a'construetion has been found to, be extremely desirable.

It will be apparent to those skilled in the art that with the construct-ion shown in Figure 24 it is possible to so position the adjustable stop 218 as to insure movement of the spindle to such an amount as to bring the cutter thereon almost into operative po tion and then retain the cutter in such position until the half nut-s have been close Where there has been provided only :1 cylinder for initiating movement, it frequently happens with an unskilled operator that before' the half nuts are closed the counter-- weighting mechanism for the spindles has produced a partial return movement thereof whereby time is subsequently lost in the slower movement to operative position under the influence of the" lead screw.

Throughout the specification, the tern-1s raising, lowering and the like are used aswords of description to designate move ment away from or towardsome predetermined point respectively.,- and are not used as words of limitation, it being obvious that

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