US2576239A - Tube thread grinding machine - Google Patents

Description

NOV- 27, 1951 Cy A. REIMSCHISSEL ET AL 2,576,239

TUBE THREAD GRINDING MACHINE Filed May 29, 1947 13 Sheets-Sheet l N It T B 5 76a T.. 352 g if f M212 359 P48 '88" \'""'N64'1 l L. J

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TUBE THREAD GRINDING MACHINE Filed May 29, 1947 15 Sheets-Sheet 2 CHARLESY A. REIMSCHISSEL GEORGE E. HIEBER mwkww www NOV- 27, 1951 c. A. RElMscl-HSSEL ET AL 2,576,239

TUBE THREAD GRINDING MACHINE Filed May 29, 1947' 13 Sheets-Sheet 5 CHARLES A. FeEmscHllssEl.

IE] GEORGE E. HIEBER NOV. 27, 1951 c. A. RElMscHlssEL ET AL 2,576,239

TUBE THREAD GRINDING MACHINE Filed May 29, 1947 13 Sheets-Sheet 4 CHARLES A. REIMSCHISSEL Fig. E] GEORGE E. HIEBER 5M QRMN E www www@ Nov. 27, 1951 c. A. RElMscHlsSEL ET Al. 2,576,239

TUBE THREAD GRINDINGv MACHINE Filed May 29, 1947 l5 Sheets-Sheel 5 NOV 27, 1951 c. A. REIMSCHISSEL ET A1. 2,576,239

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CHARLES' A. REIMSCHISSEL GEORGE E. HIEBER mmxwww @www NOV- 27, 1951 c. A. RElMscHlssEl. ET AL 2,576,239

TUBE THREAD GRINDING MACHINE 13 Sheets-Sheet 7 Filed May 29, 1947 uws /A CHARLES A. RElMscs-HssEL -GEORGE E. H l EEIER NOV 27, 1951 c. A. REIMscl-nssr-:L ET AL 2,576,239

TUBE THREAD GEINDING MACHINE me/vm l CHARLES A. REIMSCHISSEL.

H GEORGE E. HEBER @M MMBWM @www NOV- 27, 1951 c. A. Rr-:lMscHlssEL ET Al.

TUBE THREAD GRINDING MACHINE 15 Sheets-Sheet 9 Filed May 29, 1947 LR ...v E SB IE WH me. E E G RR A m SG. E L R A H C Nov. 27, 1951 c. A, RElMscHIssEL ET AL 2,576,239

TUBE THREAD GRINDING MACHINE Filed May 29, 1947 l5 Sheets-Sheet lO iB O 47a LL 594 g 59.2 51g. ZE I 46e I H536@ mm1-Vw l Y wh; 55 )l sus i 2 v L] x b i 58 ,mm 458 i E56 517 y.-

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gmc/whom GEORGE E. WEBER 5M Nov. 27, 1951 c. A, RElMscl-HSSEL ET AL 2,576,239

TUBE THREAD GRINDING MACHINE 13 Shees-Sheef. ll

Filed May 29, 1947 Y ljlll Il" .Ei

www@ vv@ CHARLES A. RElMscl-nssEL GEORGEE. Hn-:BER

Nov. 27, 1951 c. A. RElMscHxssEL. ETAL 2,575,239

TUBE THREAD GRINDIG MACHINE Filed May 29, 1947 l5 Sheets-Sheet l2 O woo CHARLES A. REIMSCHISSEL ISS] GEORGE E. HIEBER N 9 2M Swamp NOV- 27, 1951 c. A. RElMscHlssEL. ET AL 2,576,239

TUBE THREAD GRINDING MACHINE Filed May 29, 1947 13 SheeLS-Shet 13 CHARLES A. RElMSCHISSEl.

GEORGE E. HIEBER Ff g'. 125A Patented Nov. 27, 1951 TUBE THREAD GRINDING MACHINE Charles A. Reimschissel and George E. Hieber, Waynesboro, Pa., assignors to Landis Machine Company, Waynesboro, Pa., a corporation of Pennsylvania Application May 29, 1947, Serial No. '151,402`

23 Claims.

This invention relates to machines for abrading metal and, more particularly, to amachine for I automatically successively grinding contours, in-

cluding threads, upon the exterior surfaces of pipe, tubing, and the like.

The present invention embraces numerous advances over the prior art. The steady trend, especially in the petroleum industry, to the use of pipe having greater strength andconsequently less advantageous machining characteristics, reduces the effectiveness of the present method of forming the threads, etc., by cutting away the metal by the use of high speed tool steel cutters. The high-tensile alloy steels now used in the manufacture of much of the pipe used by the petroleum industry require such a low cutting speed as to render that method of machining relatively uneconomical.

'I'he provision, in the present invention, for automatic and sequential grinding of the desired and efcient wheel dressing mechanisms of the proper type for both the grinding wheels.

taper and thread on the pipe enables the production of pipe ends of improved accuracy and finish at a much faster rate than is possible when using a metal cutting operation.

Accordingly, it is an object 'of the invention to' provide a'machine for grinding first a tapered end and then a length of thread upon a pipe .without transferring the pipe between operations.

In the broader sense, itis possible, as will later be shown in detail, tot, perform two4 successive forming operations of various character. Such unusual operations are' occasionally necessary as in the case of a tubing joint requiring two lengths of threads on the same end of the tube and having a sealing surface therebetween.

It is a further objectI of the invention to provide, 1n one machine, separate grinding mechanisms for performing preliminary and finishing operations upon a work piece, so that the preliminary operation, for instance taper forming, is performed by one grinding wheel, and the threading operation is performed by another.`

Another object of the invention is the provision of ingenious mechanism to compensate for the change in grinding wheel diameter due to the dressing operation, so that the working position of the wheel periphery is not affected by such change.

A further object is to provide novel means for combining the adjustment of both grinding wheels relative to the work, so that a change in the working position of the grinding wheels, necessitated by a change in the work diameter, may be quickly and accurately made.

Another object is the provision of convenient Another object is the provision of a novel machine for automatically performing sequential grinding operations upon a workpiece whichhas been inserted into the machine.

Still other objects are to provide for the adjustment of the machine for various work diameters, tapers, thread lengths and helix angles, as well as to provide' a machine which may be operated entirely automatically, once said adjustments are made.

Various other objects and advantages will be apparent from reference to the following description of a preferred embodiment of the invention and the accompanying drawings thereof.

In the drawings:

Figures 1 and 1A comprise .a plan View of the entire` machine;

Figure 1B is a partial plan view of that portion of the machine adjacent its centerline;

Figure 2 is a side elevation of the thread grinding wheel head;

Figure 3 is an elevation of the thread grinding wheel head taken substantially along line 3`3 of Figure 1;

` Figure 4 is a longitudinal sectional view of the thread grinding wheel head taken substantially along line 4-4 of Figure 3;

Figure 5-is a transverse sectional View of the thread grinding wheel head taken substantially along line 5-'5 of Figure 4;

Figure 6 is ,a fragmentary vertical sectional view on line 6--6 of Figure 4;

Figure 7 is a fragmentary vertical section on line 'l-l of Figure 4;

y Figure 8 is a fragmentary vertical section on line 8-8 of Figure 1;

Figure 9 is a fragmentary vertical `section on line 9--9 of Figure 1; A

Figure 10 is a side elevation ing wheel head; g .i

Figure 11 is a longitudinal sectional view` taper grinding wheel head takenalong line II-Il ofFigure l2; l A

Figure 12 is a transverse sectional view of the taper grinding wheel head taken substantially along line l2-I2 of Figure 11; Y f

Figure 13 is a fragmentary horizontal section jhe Substantially on line I3|3 of Figure 2; and also shows the cover removed and being partially in section on Figure 15 is a vertical sectional view of the stock stop and leadscrew housing on line |5|8 of Figure 14;

Figure 16 is a vertical sectional view of the leadscrew mechanism on line |8|8 of Figure 14, detail beyond the plane ofthe section being omitted for purposes of clarity; y

Figure 1'7 is a vertical sectional view of the leadscrew mechanism on line |1| 1 of Figure 14, detail beyond the plane of section being omitted for purposes of clarity; and

Figures 18 and 18A taken together are a diagram of the electric circuit and hydraulic sys-` tem which are interconnected to automatically operate the machine.

As seen in Figures 1 and 1A, the main divisions of the machine are the headstock 3 8, the taper grinding mechanism 32, the thread grinding mechanism 34 and the housing 36 containing the leadscrew and mechanism for regulating the axial position of ythe pipe to be machined. It will be noted that the taper grinding mechanism 32, the thread grinding mechanism 34 and the stock stop and leadscrew housing 38 are mounted upon a stationary base 31 which is secured at 38 to the headstock 38.v The base 31 may be an integral structure or, for convenience of manufacture, it may be subdivided into a.

number of sections, secured together by bolts orl the like.

The headstock 38 may be of a type now known to those skilled in the art having front and rear chucks 38 and 48 respectively for gripping the pipe. Chucks 38 and 48 are mounted upon opposite ends of a rotatable spindle 35 (Figure 18) which is driven through a worm 4| and a worm wheel 43 by a reversible direct current motor 42. Chucks 38 and 43 are opened and closed by yokes 44 and 4'8 respectively which are operated by a iiuid cylinder 41 (Figure 18) contained in the headstock 38.

The above-described mechanism thus serves to support and rotate the pipe (indicated at 45) accurately about a constant axis and at a desired speed so that metal removing operations may be performed upon it. The detailed construction of said mechanism forms no part of Referring to Figures 2, 3 and 4, the base 31 directly supports the slide base 48. A pivot'pln 58 (Figure 4) is journalled through suitable aligned openings in both base 31 and slide base 48. Thus slide base 48 may be swivelled on base 31 about the axis lof pivot pin 58. As seen in Figure 13, a bracket 52 is secured to base 31 by screws 54, near the rearward end of said base 31 and laterally spaced from slide base 48.

A pin -56 is passed vertically through the two rearwardly extending arms 58, 88 (Figure 2) of thebracket 52. Pin 56 is provided with a transverse opening 62 between arms 58 and 88, through which the screw 84 is journalled for rotation. Axial movement of screw 84 in one direction is prevented by the shoulder 86 thereon which abuts the iiattened side of pin 58. The

:opposite side of pin 56 is also attened adjacent -lopening 82 to receive in abutting relation the hub ofrhandwheel 88 which is secured against vrotation on screw '84l by a suitable key, not shown, and against axial movement by the nut 18 (Figure 2) threaded upon the outer extremity of screw 84.

The slide base 48 is provided with a vertically spaced pair of lugs 12 (Figures -1 and 13) throughv which the pin 14 is journalled. The screw 64 is threadedly engaged in a transverse threaded hole 15 in pin 14 between the-lugs 12. The abovedescribed mechanism constitutes the means for rotating the slide base 48 about the pivot pin 58. The required degree of rotation is achieved by reading the cooperating pointer 18 (Figure 13), attached to the rearward wall of slide base 48, and scale. 18 inscribed upon the adjacent top surface of base 31. A screw 88 (Figure 13) having threaded engagement with a suitable opening in base 31 passes through-elongated slot 82 in lug 84, which is formed integrally with slide base 48, and when tightened, secures slide base 48 in adjusted angular position.

As will be more fully realized later, this swivelling motion of slide base 48 in a horizontal plane about pivot pin 58 is for the purpose of exactly aligning said base and all the mechanism carried thereby, including the grinding wheel, with the taper vof the thread desired to be produced upon the pipe, as seen in Figure 1.

As seen in Figure 4, the slide base 48 is provided with a pair of transverse slideways 88 and 88 upon which is mounted the cross slide 88. Slideway 88 is V-shaped and provided with rollers 82. Slideway 88 is of the fiat type and is provided with rollers 84. Rollers 82 and 84 serve to eliminate friction and insure the facile movement of cross slide 88 in a transverse direction, movement in the longitudinal direction being prevented by the V-shaped Slideway 88.

Referring to, Figure 5, cross slide 88 is provided on its top surface with the flat slideways 98 and 81 and the V-shaped slideway 98 arranged in the longitudinal direction. Upon these ways, the wheel slide |88 is mounted. A bracket |82 (Figures 2 and 4) is mounted upon the rear wall of wheel slide |88 and extends rearwardly therefrom to engage the piston rod |84 oi' an hydraulic cylinder |88 which is secured to the rear wall of the cross slide 88. Cylinder |86 is operable automatically to reciprocate the wheel slide |88 in a direction perpendicular to the direction of movement of the cross slide 98. The manner in which such auwmatic operation may he accomplished will be described later.

The wheel slide 88 has along one side thereof y the integral upward extension |88 (Figures 1, 2

and 4). To the centrallyfacing wall |88 (Figure 4) of extension |88 is secured, in a manner to be described later, the spindle housing ||8, (Figure 6). A cylindrical opening ||2 (Figure 6) through housing |18 contains-at opposite ends thereof, the bearings ||4 and I8, axially spacedapart by means oi the spacing sleeve I8. The wheel spindle |28 is thus rotatably supported by bearings ||4 and H8.

At one end of the opening I2, bearings-I |8 are which is retained in position axially by the cap At the opposite end of opening H2, the bearings ||4 are retained therein by the stationary cap |40, which abuts the outer bearing race and is secured to spindle housing ||0 by means of screws |42, and by a shoulder |44 which is formed integrally with spindle |20 and which abuts the inner race. A rotating cap |46 is secured by means of screws |48 or the like-to shoulder |44 and provides an end seal by having, together with cap |40, interiitting ridges and grooves |50. The tapered end |52 of spindle |20 supports the ilanged grinding wheel hub |54 which is retained thereon by means of the cap |56 and screws |58. A key |60 prevents independent rotation of hub |54 and spindle |20. The thread grinding wheel |62 is axially retained on hub |54 |by the integral flange |64 on one side and the plate |66 on the other side. Screws |68 secure plate |66 to hub |54 and clamp the wheel |62 against ilange |64.

Wheel slide |00 is formed with an integral upward extension (Figure 2) along its rearward end. Extension |10 is provided with a plane rear face |1| to which is secured by screws |12 the swivel plate |14. Lugs |16 (Figure 1) at each end of the top of plate |14 support the rod |18 which is also journalled through the lugs |80 which are formed integrally with the motor plate |82. A motor |84 is attached to motor plate |82 as by means of bolts |86. A set screw |88 is threaded into the bottom of the motor plate |82, passing therethrough to engage the rear surface |81 of swivel plate |14. A nut |90 retains screw |68 in adjusted axial position. Thus, by rotating motor |84 slightly about rod |18, by means of screw |88, the distance between the motor axis and the grinding wheel axis may be varied, providing a means for adjusting the tension of the driving belts |92 which connect the wheel sheave |32 and the motor sheave |93 which is mounted on the motor shaft.

The mounting 'of the swivel plate |14 and the spindle housing I0 at opposite ends of the wheel slide |00 is shown in Figure 4 and Figures 6 to 9 inclusive. The spindle housing ||0 is secured to the forward vertical wall |09 of extension |08 by means of four screws |94 each of which threadedly engages a block |96 of T-shaped cross-section. The T-slots |98 formed in the face |09 of extension |08 prevent the blocks |96 from moving axially and thus the spindle housing ||0 is firmly secured to extension |08. Bosses |95 on housing ||0 have horizontally elongated openings |91 therethrough, for the passage of the screws |94. Thus when screws |94 are loosened, spindle housing I0 may be rotated in a vertical plane, as will be described.

`A pair of pins 200 (Figures 4, 6 and 7) are embedded in extension |08 and protrude therefrom to thereby fasten the arcuately formed shoes 202 to the face |09. The shoes 202 are received in a shallow arcuate groove 204 lying in a vertical plane and formed in the rearward surface of housing -I I0. The center from which groove 204 is formed lies in a horizontal plane containing the grinding wheel axis and in a transverse vertical plane bisecting the grinding wheel |62. It is evident therefore that the screws |94 may be loosened and the spindle housing ||0 and all mechanism supported thereby may be rotated in a vertical plane about a horizontal line bisecting the grinding wheel and passing through its axis.

The above described adjustment is for the purpose of tilting the grinding wheel |62 into alignment with the predetermined helix angle of the thread to be produced and is similar to the adjustment therefor disclosed in the izo-pending application of Mr. Clarence B. Ziegler, Serial No. 519,210, i'lled January 21, 1944, now Patent No. 2,557,166, dated January 19, 1951.

To drive the grinding wheel spindle |20 without twisting the belts |92 as the housing- ||0 is rotated, a similar adjustment is provided for the motor |84. The screws |12 which secure swivel plate |14 to extension |10 pass through elongated slots 206 (Figure 8) therein, which permit rotation ,of plate |14 in a vertical plane. A pivot member 208 formed cylindrically with two diameters 201 and 209 has its larger diameter portion 209 extending into plate |14 and is secured thereto by screws 2|0. The smaller diameter portion 201 of pivot member 208 is free to rotate in a suitable mating opening inv` extension |10 as shown in Figure 8. The center of pivot member 208 lies in the horizontal line about which housing ||0 is rotatable. Thus, when screws |12 are loosened, swivel plate |14 and all parts attached thereto may be rotated to the desired angle, keeping the two belt sheaves |32 and |93 in accurate alignment.

The mechanism for rotating the swivel plate |14 and spindle housing ||0 in unison is best shown in Figure 9. The handwheel 2|2 is secured to the top of the vertical shaft 2| 4, which is journalled through the cover 2|6 of the gear box 2|8 which is mounted on wheel slide |00 at the juncture of extensions |08 and |10 (Figures 1 and 2). Shaft 2|4 extends downwardly through the interior of extension |10 and has its lower end journalled through the lower arm of a U-shaped bracket 220 formed integrally with the rear wall of extension |10. A recess 222 is formed in the rear wall of extension |10 by the U-shape of the integral bracket 220. That portion of shaft 2|4 which passes through the recess 222 is threaded to engage thereon the travelling nut 224. Nut 224 is provided with a cylindrical projection 226 which extends outwardly from the surface of extension |10 to be pivotally received in a-mating opening in the rectangular sliding block 228, which is free to move laterally in a slot 230 in the forward surface of plate |14. Thus, after screws |12 are loosened, the vertical movement of nut 224, caused by manual rotation of handwheel 2| 2, will cause plate |14 and themotor attached thereto to rotate about the pivot mem- `ber 208.

The gear box 2|8 contains the bevel gear 232, ilxed to the shaft 2|4 for rotation therewith. A mating bevel gear 234 is-similarly iixed to shaft 236 which is iournalled through the side of gear box 2|8 and which extends through the side of a similar gear box 238 at the forward end of extension |08. Within gear box 238, the bevel gear 240 is xed on shaft 236 to mate withbevel gear 242 which isvxed tothe vertical shaft244. Shaft 244 is journalled in the cover 246 of gear box 238 and inthe lower arm 249 of a U-shaped bracket 248 formed integrally with the forward wall of extension |08.

A recess 250 in the forward wall |09 of extension |08 is formed and enclosed by the integral bracket 248. That portion of shaft 244 which passes through the recess 250 is threaded to engage thereon the travelling nut 252. Nut 252 is provided with a cylindrical projection 254 which extends outwardly from the surface of wall |09 to be pivotally received in a mating opening in the rectangular sliding block 256, which is free to move laterally in a slot 258 in the rearward Y surface of spindle housing I I0. Thus when screws audace 7 |84 are loosened the vertical movement of nut 252, caused by manual rotation of handwheel 2|2, will raise or lower the sliding block 256 and cause housing I l and the parts supported thereby to rotate about the center of groove 204. It

Awill be seen, therefore, that the angular adjustment of grinding wheel |62 and wheel motor |84 .260, the shaft 264 extends rearwardly therefrom and is provided at its rearward extremity with a guide portion 266 which is journalled for rotation in a suitable opening 268 in the lug 210 formed integrally with wheel slide |00. On shaft 264 and between guide portion 266 and lug 260 are formed two threaded portions 212 and 214 having threads of opposite hand.

Threadedly engaged on the rearward threaded portion 212 of shaft 264 is the bracket 216. As best seen in Figure 5, two vertically disposed webs 218, 280 are formed integral with wheel slide |00 and are arranged one on each sidef the travelling bracket 216. Rectangular slideways 282 and 284 formed in the oppositely disposed surfaces of webs 218 and 280 respectively serve .to support bracket 216; Across the'lower portion of its forward surface, bracket 216 is provided with the hardened plate 286.v

The cross slide 80 is formed interiorly with a lug 288 (Figure 4) which also may be formed individually and secured to cross slide 80. A short shaft 292 is journalled for rotation in lug 288 with its axis parallel to shaft 264. The travelling bracket 204 is threadedly engaged upon the threaded rearward extremity of shaft 202. Oppositely disposed rectangular slideways 206 and-208 (206 being visible in Figure 5 and 208 being visible in Figure 4) are also formed integrally with the frame of cross slide 00 to serve as support for the bracket 204. A hardened plate 300 is also attached to bracket 204, but on the upper side and facing in the directionoppositethat of plate 286.

It will now be seen that, since cross-slide 90 has no movement in the direction perpendicular to the grinding wheel axis, bracket 204 will remain stationary in that direction until adjusted differently by rotation of shaft 292. It will also be apparent that, since the usual path of motion of the wheel slide |00 is perpendicular to the grinding wheel axis in order to bring the grinding wheel into contact with the work, bracket 216 will have motion in the said direction and that the depth of penetration of the grinding wheel into the work will be limited by the contact of plate 286 with stationary plate 300. When greater or less travel of wheel slide |00 is desired, as when a different size of work is operated upon, it is merely necessary to rotate shaft 202, thus moving bracket 294 farther from or closer to the center of the work and thus correspondingly decreasing or increasing the travel of the wheel slide |00.

Forwardly of the lug 288, on the extremity of shaft 292 is iixedly mounted the bevel gear 302 which (Figure 5) meshes with'the bevel gear 304 secured upon the end of the transversely directed shaft 306. The separable lug 308, which is attached to the frame of cross slide 90, supports the bearing bushings 3|0 through which shaft 306 is journalled, another bevel gear 3|2 being aflixed to the opposite end of shaft 306.

Gear 3|2 meshes with the bevel gear 3|4 (Fgure 4) which is affixed to the longitudinal shaft 3|6, rotatably journalled in the lug 3|8, which is also secured to the frame of cross slide 80. A universal joint 320 on the opposite end of shaft 3|'6 is connected to the spline shaft 322. A coupling 324 is telescoped over spline shaft 322and is rotated by means of a handwheel 620 (Figure 10) as will be described later. It is obvious that this rotation will be properly transmitted regardless of the relative lateral or transverse position of the taper grinding mechanism and thread grinding mechanism due to the provision of the universal joint 320 and spline shaft 322.

Referring again to Figure 5, the wheel slide .|00 is provided, rearwardly adjacent the grinding wheel |62 with the male element 32s of a `dovetail slide, upon which is mounted the crusher slide 328 for reciprocating motion in a direction parallel to that of the wheel slide |00. The upper surface of the crusher slide 328 is also formed with the male element 330 of a dovetail slide, upon which the crusher bracket 332 is mounted for movement transversely of the crusher slide 328 and parallel to the grinding wheel axis.

A groove 334 longitudinally formed in the male element 330 provides space to receive a lug 336 formed on the bottom surface of the crusher bracket 332. A threaded shaft 338 is supported land journalled for rotation by the bracket 340 to extend interiorly of groove 334 and to engage the interiorly threaded lug 336. The bracket 340 is secured to the side of crusher slide 328 by the screws 342 (Figure 2). A knob 344 is aiiixed to the outer end of the threaded shaft 338 for rotating the same by hand and thereby causing the crusher bracket 332 to be adjusted transversely of the wheel slide |00 and the crusher slide 328.

Crusher bracket 332 supports the crusher roller 346, preferably made of hardened steel and used for renewing the desired contour of the grinding wheel |62. As is known in the art, the reverse of the desired contour is formed upon the roller 346 which is then forced radially against the periphery of the grinding wheel to impress the correct form into the relatively softer abrasive material thereof, both crusher roller and grinding wheel being rotated at slow identical surface speeds so that there is no relative surface movement therebetween.

The roller 346 is shown as driven through speed reducer 348 (Figure 1) and couplings 350 and 362, by motor 354. These latter units are all mounted on the sidewardly extending wing 356 of crusher slide 328. An opening 358 is provided in. the side of extension |08 for the reception of these parts (Figures 2. 4 and 5).

That part of the crusherY slide 328, which is rearwardly spaced from bracket 332, is provided Y with an integral upwardly extending bracket 360 (Figure 4). Into a threaded opening 36| in bracket 360 is threaded the piston rod 362 of the hydraulic cylinder 3'64, which is attached to the forward wall of the wheel slide extension |10. Thereby a means is provided for forcing the crusher slide 328 and roller 346 into contact with the grinding wheel and for withdrawing the same therefrom. l

In Figure 4 it will be noted that crusher slide 328 is formed with a large downward extension 366 which extends through openings in dovetail 326 and web 258 into a position upwardly spaced from threaded shaft 264. A hardened block 368 is secured to the lower forward end of extension 366.

The forward threaded portion 214 of the shaft 264 is passed through the nut section of a sliding bracket 310, which, like bracket 216, is seated for sliding movement in the slideways 282 and 284. A hardened block 312 is attached to the rear top of bracket 310, in opposed relation to block 368 on bracket 366. Thus, it will be seen that movement of crusher slide 328 towards the grinding wheel is ended by the contact of blocks 368 and 312.

A bevel gear 314 is flxed on the forward end.

of shaft 264 and forwardly of bearing lug 260. Gear 314 meshes with bevel gear 316 which is attached to the cross-shaft 318. 'Shaft 318 extends through a bearing bushing 380 in-the vertical web 280 and through bearing bushing 382 in the aligned lug 384 (Figure 5). Two gears are mounted upon the other end of shaft 318 beyond the bearing 382: the large bevel gear `386 which is mounted adjacent bearing 382 and the smaller bevel gear 388 secured upon the extreme end of the shaft. f

Bevel gear 388 cooperates with bevel gear 390 (Figure 4) which is connected by shaft 392, universal joint 394, and spline shaft 396 to the splined coupling 398, which is connected to be rotated by a crusher handwheel 486 in a manner to be later described.

Bevel gear 386 (Figure 5) engages the bevel pinion 400 which is secured to the lower end of the vertical shaft 402. Shaft 402 is journalled through the bearing bushing 404 fixed in the frame of wheel slide |00 and extends upwardly to the connector 406 mountedon top of the wheel slide extension |08 where shaft 402 is attached to the flexible shaft indicated at 408 (Figure 4).

Spindle housing ||0 is provided with an upwardly extending bracket 4|0 (Figures 3 and 4) which is formed with a spacious recess 4|2 on one side. Secured to the top of bracket 4|0 is a gear box 4| 4 having a cover 4|6. The extremity of fiexible shaft 408 is journalled through the side of gear box 4|4 and has a bevel pinion 4|8 attached thereto. The mating bevel gear 420 is mounted on the upper end of the vertical shaft y 422 which is journalled through the bushing 424 fixed in the bottom of gear box 4|4 and bracket 4|0.

Referring to Figures 3 and 4, the bracket 4|0 is provided, on one side thereof, with the dovetail slideway 426 in which is mounted for vertical sliding movement the dresser base 428. A lug 438 projects from the rearwardv surface of dresser base 428 into therecess 4 I 2. Shaft 422 is threadedly engaged with lug 430 so that rotation of shaft 422l will cause dresser base 428 to move ver` tically. The outer surface of dresser base 428 is provided with two laterally spaced arcuate T- slots 432, 433. The bracket 434 is adjustably secured to 'dresser base 428 by screws 4 36 and suitable T-clamps (not shown), engaging the slots 432 and 433.

A forward extension 438 of bracket 434 is formed, on its downwardly facing surface, with adovetail slideway 440 in which is mounted for sliding movement the dresser slide 442. A diamond dressing tool 444 is held in operative relation to grinding wheel |62 by the slide 442. To the opposite end of bracket 434 a hydraulic cylinder 445 is attached having its piston rod secured to the rear end of dresser slide 442 making it possible to reciprocate dressing tool 444.across the face of grinding wheel |62.

It is apparent then that the working position of the dressing tool 444 is adjustable vertically for change in diameter of the grinding wheel by means of threaded shaft 422 and lug 430. The path of reciprocation of dressing tool 444 is adjustable angularly by means of the arcuate T- slots 432. Thus, as shown in Figure 3, the threadforming grooves of grinding wheel 62 may b e beveled off by dressing tool 444 at any 'desired angle with the axis of the wheel. This is useful to enable the wheel to reproduce on the work the gradual vanishing of the threads that present pipe thread standards demand.

In Figures 2 and 3 will be seen the conventional type of wheel guard 446 surrounding grinding wheel |62 and attachedby screws 448 to spindle housing ||0. A similar cover 450 is provided to envelop the belts and driving sheaves.

Taper grinding mechanism -mechanism for regulating this movement is identical with that described previously as being associated with slide base 48, and is controlled by hand wheel 455. Secured to slide base 452 by screws 456 (Figure 12) is the stationary support member 458, corresponding to the cross slide i of the thread grinding mechanism. Since there is no necessity for movement of the taper grinding wheel -in an axial direction, support member 458 is thus stationarily mounted upon slidebase 452.

-Flat slideways 460 and 462 and V-shaped slide- Way 464 are provided on the top of support member 458 to enable the taper grinding wheel slide 466, mounted thereon, to reciprocate in a direction perpendicular to the grinding wheel axis. This motion is powered and controlled by the hydraulic cylinder 468 mountedl on the rear wall of support member 458 and having its piston rod 410 connected tol rearwardly extending bracket 412 attached to the rear wall of wheel slide 466.

The taper grinding wheel 414 is supported by the spindle housing 416 (Figure 1A) in the same manner that thread `grinding wheel |62 is supported by spindle housing ||0. In the present instance, however, spindle housing 416 is removably, but not adjustably, affixed to the forward wall of the upward side extension 418 of wheel slide 466, as by the cap screws 419 (Figure 1A), since the necessity for helix angle adjustment is not present in the taper grinding mechanism.

The wheel slide 466 is also provided with the The crusher handwheel 486 (Figure 10) transj mits motion through shaft 488 (Figure 11) to the bevel gear 490 (Figure 11). Gear 490 meshes with bevel gear 492 mounted upon shaft 494 which is connected to universal Joint 498, spline shaft 498 and splined coupling 898. Thus, through the above described connection and its continuation in the thread grinding mechanism, crusher handwheel 488 serves to rotate directly the shaft 264 (Figure 4) which moves the brackets 216 and 810 in opposite directions.

Referring to Figures 11 and 12, support member L458 is provided, interiorly thereof, with longitudinally directed, rectangular slideways 500 (Figure 12) and 502 (Figure 11) in which bracket 504 is mounted. A shaft 506 is journalled for rotation in bushing 501 in the detachable lug 508 which is secured to the frame of support member 458. One end of shaft 506 is threadedly engagedflg in the travelling bracket 504 while the opposite end has secured thereto the bevel gear 5|0.

Gear 5|0 meshes with two bevel gears 5|2 and 5|4 (Figure 12) .f Gear 5 I2 is mounted upon shaft 5|8 which is journalled through bushing 5|8 in the side wall of support member 458. A handwheel 520 is secured to the outer end of shaft 5|6. 'I'hus rotation of shaft 506 is produced and the same rotational movement is transmitted through gears 5I2, 5|0 and 5|4 to a coaxial shaft 5|1 to which gear 5| 4 is attached. Shaft 5|1 is journalled through the bearing bushings 52| in the lug 5|9 secured to the frame ofsupport member. 458. The opposite end of shaft 5|1 has mounted thereon the bevel gear 522.

Gear 522 meshes with bevel gear 524 (Figure .11) which is secured upon shaft 526 journalled through lug 528 attached to the frame of support member 458. Shaft 526 is connected by universal joint 580 and spline shaft 532 to the splined coupling 324 for transmission of rotary movement through the mechanism previously described vto shaft 292 (Figure 4) in the thread v grinding mechanism. Thus it is apparent that handwheel 520 is employed to adjust brackets 294 and 504 simultaneously.

Anotherhandwheel 534 mounted upon a transverse shaftv 536 whichl is journalled for ro'- tation in the bearing bushing 538 set in the side wall of wheel slide 466. Shaft 588 extends through wheel slide 466 and has its opposite end journalled in bushing 540 fixed in the opposite wall of said wheel slide 466. Interiorly adjacent bushing 540 a pinion 542 is mounted'on shaft 586 for engagement with an idler spur gear 544. A stud 546 which supports gear 544 is journalled `through the side wall of'wheel slide 466 and is held in correct axial position by the nut 548 engaged on the outer extremity thereof. Gear 544 meshes with pinion 550 to transmit rotary motion to shaft 552 on which pinion 550 is.

562 (Figure 11) secured on the longitudinal threaded shaft 564.

Shaft 564 has its forward end journalled for rotation in bushing 566 xed in lug 568 which is secured to the frame of wheel slide 466. Extending rearwardly therefrom, shaft 564, terminates in a guide portion 510 which passes through an opening 51| in lug 512 formed integrally with wheel slide 466. Between portion 510 and gear 562, shaft 564 has .two threaded portions 514 and 516, the threads of which are of opposite hands. The rearward threaded portion 516 engages the threaded -bore of sliding bracket 518 which is mounted for longitudinal sliding movement in remainder being supported by being threaded through brackets 518 and 588.

A hardened plate 584 is carried by bracket 518 'at its forward lower edge to engage a similar plate 586 carried at the top of bracket 504. Thus, the relative positions of brackets 504 and 518 determine the amount of infeed applied to grindingwheel 414, an amount which may be made greater, as when a smaller diameter work piece is being operated'upon, by turning handwheel 520 to move bracket 504 to the left (Figure 11) and vice versa. y

In Figures 11 and 12 it is seen that the whe slide 466 is provided with a platform 590 upon which is mounted the male element 592 of a dovetail slide. A dresser slide 594 is mounted on male element 592 for reciprocation in a path perpendicular to the axis of grinding' wheel 414. A plate 596 is mounted on the forward end of dresser slide 594 and ispositioned by the key 591. The male element 598 of a dovetail slide in the transverse direction is formed on plate 596. A transverse slide 600 is slidably mounted on male element 598.

A template 602 is secured by screws 604 (Figure 1A) to plate 596. A template follower 606 is secured by screw 608 to the side of a substantially cylindrical member 6|0 journalled longitudinally through transverse slide 600. A diamond tool 6|2 is supported by member 6|0 and maintained thereby in correct position for dress` l ing grinding wheel 414. A hollow member 6|4' is threadedly engaged in slide 600 in alignment with member 6|0 and contains a compression spring 6I6l which presses against member 6I0 and thereby maintains follower 606 in contact with template 602.

From Figures 1A and 10 it is seen that a hy- "draulic cylinder 6|8 is mounted upon a bracket with dresser slide 594 to threadedly engage the piston rod 626 (Figure 11) of the hydraulic cylinder 628. A nut 630 locks piston rod 626 in desired axial position. Cylinder 628 is secured to the forward wall of extension 480 of wheel slide 466 and is effective to move diamond tool 6|2 into a position where it is ready to traverse the grinding wheel 414. The cylinder 628 is not essential to proper operation of this wheel dressing operation vbut may be used, if desired, to withdraw the diamond tool 6|2 from proximity to grinding wheel 414 for replacement or other reasons and for returning said tool to operative position without disturbing the previously adjusted relationship between dressing tool position and grinding wheel diameter.

. In Figure 11 it will be noted that dresser slide 594 is provided with a downwardly extending 13 portion 632, to the lower forward extremity of which is attached a hard plate 634 in `opposed relation to a similar plate 636 in the upper forward corner of bracket 586. Thus the forward motion of dresser slide 564 and, consequently, the amount of penetration of diamond tool 612 into grinding wheel 414 is limited bythe position of bracket 586. This position, as before de- (scribed, is adjustable by rotation of handwheel Auxiliary mechanisms Figures 1 and 1A show the housing 36 located opposite the head stock 36 and partly between the taper and thread grinding mechanisms. 'I'his housing 36 and its contents are more fully shown in Figures 14 to 17 inclusive.

Figure 15 shows a hydraulic cylinder 638 mounted in the upward extension 846 of housing 36. The piston rod 642 oi' cylinder 636 is threadedly engaged in the rearward end of the rod 644. A lock nut 646 is provided for the purpose o1' maintaining this adjustable connection in ad- Justment, and a key 648 prevents rotation of rod 644 in the opening in extension 646 of housing 36`through which said rod is slidably journailed.

Figures 1 and 1A show that rod 644 extends from housing 36 toward the front chuck 36 in alignment with the center thereof. A stop bar 556 is secured to rod 644 for the purpose of engaging the end of the pipe 45 to be machined and lplacing said pipe in proper position between the grinding wheels as will be described. A further i extension 652 (Figure 1B) of rod 644 carries a cylindrical sealing member 554 inside the pipe While it is being operated upon to prevent escape of coolant, etc. through the pipe.

Rod 544 is provided, along its lower surface, with the rack teeth 656. A gear 658 is fixed upon shaft 666 which is journalled for rotation in opposite walls of extension 646 of housing 36. Gear 558 acts to transmit longitudinal motion from rack teeth 656 to similarrack teeth 662 formed along the upper surface of a switch actuator rod 664 which is journalled for reciprocative longitudinal movement in a bore 655 in the extension 646. `'A tube 666 having its outeri end closed is threaded into the outer end of the bore 665 to provide suiiicient room for the travel of rod 664 and at the same time prevent the entry of foreign matter into the mechanism.

It will be seen that the movement of rods 644 and 664 will be controlled by thecylinder 636 and that said rods will always move in opposite directions. As will be explained later in connection .with Figure 18A, therod 644 carries a pair of dogs which operate a pair of limit switches LS41 and LS46.

A rotatable shaft 616 (Figures 1B and 15) extends from the headstock 36, where it is connected by means of suitable gearing (not shown) to the driving motor 42, to the housing 36, where it is journalled in bushing 612 in the forward wall thereof (Figure 15). A bracket 614 is formed integral with the frame of housing 36 and supports a bushing 616 in which shaft 616 is also journalled. A lock nut 618, threaded upon the end of shaft 616, retains the same in correct axial position.

In the space between bushings 612 and 616, a spur gear 586 is iixedly mounted on shaft 616. On one side, gear 666 drives the gears 682 and 584 (Figure 14). the latter of which is suitably connected to a timing mechanism 685 (Figure 18) whose purpose is to synchronize the operations of all parts of the machine. On the other side, gear 686 drives gear 666 (Figures 14 and 16) which is mounted on a stud 661 journalled in bushings 668 and 666 (Figure 16) in a housing 36 and bracket 614 respectively. The emerged end 662 of stud 661 and allocknut 664 prevent axial movement of said stud.

Gear 686 drives gear 666 (Figures l1.4 and 18) xed on shaft 566. 1 The rear wall of housing 66 is provided with a large recess 166 to receive the leadscrew change gears of the machine. A cover 162 is removably secured over recess 166. The bottom wall 164 of recess 166 is bored to receive the bearing bushing 166. Shaft 666 is ljournalled for rotation in bushings 166 and 166, the latter of which is secured in the forward wall of housing 36.

Also pivoted about bushing 166 is a gear. quadrant 116, exteriorly of which gear 112 is flxedly mounted upon shaft 666. A nut 114 is provided to retain shaft 666 in axial position. Gear 112 drives gear 116 which is rotatably mounted upon a bushing 116 supported by stud 126. Stud 126 passesthrough a suitable opening in gear quadrant 116 and is held in place axially by its own enlarged head 122 and nut 124 which is clamped against the bushing 116.

Gear quadrant 1 I6 is secured in adjusted angul lar position about shaft 668 by the nut 126 and washer 126 which are received upon stud 136 mounted in an opening through wall 164 of recess 166. Stud 136 passes thorugh the arcuate' slot 132 (Figure 14) in quadrant 116, which provides for its adjustment to any of a variety of angular positions according to the gear ratio selected. Another slot 134, having one end open, is provided in quadrant 116 for the insertion of a stud carrying another idler gear for the purpose of reversing the direction of the final driven gear and thus, as will be more evident later, cutting a left hand thread.

Gear 116 drives the leadscrew gear 136 (Fig-- ures 14 and 17) which is secured upon the rearward extremity of the leadscrew 136 by the nut move axially with respect to them under overload conditions, as will be apparent. The bushing 146 is employed as a spacing member between bearings 142, 142. The caps 148 and 156 are provided at opposite ends of boss 144 surrounding leadscrew 138 to retain bearings 142, 142 in said boss, the caps being affixed to the boss in any suitable manner.

The threaded portion 152 of leadscrew 136 is engaged inthe leadscrew nut 154 of cylindrical outline and journalled for longitudinal movement in the boss 156 in the forward wall of housing 35. A key 156 prevents rotation of leadscrew nut 154. A sealing member 166 surrounds leadscrew nut 154 on the outer side of boss 156. Exteriorly of housing 36, leadscrew nut 154 is formed with an integral arm 162 and pin 164 which pin is positioned vertically across the axis of leadscrew nut 154. A bearing bushing 166 surrounds pin 164 and has journalled thereon one end of a link 166. A locknut 116 isthreadedly engaged on the end of pin 154 to retain link 166 thereon.

As seen in Figures 1 and 3, link 166 has its other end journalled upon bushing 112 which is fitted over the vertical pin 114. Pin 114 is fixed in the extension 115 of cross slide 66. Thus, itis apparent that rotation of the above-described lead-

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