US2471991A - Stone dresser - Google Patents

Description

May 31, 1949.

P. WEYNAND S TONE DRES SER 4 Sheets-Sheet l Filed April 22, 1947 v Filed April 22, 1947 4 Shets-Sheet 2 May 31, 1949. v P. wEYNANlz)` 2,471,991

STONE DRES SER Y EE. E Ffg E May 31, 1949- P. WEYNAND 2,471,991

STONE DRESSER Filed April 22, 1947 4 She-zellS-Shee(l 3 FLE lE- E l5 H 14 E 15 l 'WNLU Ma/Q ATTORNEYS.

P. WEYNAND May 31, 1949.

sToNE DREssER 4 Sheets-Sheet 4 Filed April 22, 1947 FELLLI W :inventor legnami Gttornegs Patented May 31, 1949 UN ITE-.Dv STATE-S PATENT OFFICE.

STQNE DRESSER vPaul Weyia'nd, San Aritonio,l Tex.

ApplicatonAprilza, 1947.-; SerialNo. 743,079

(Cl. V12S-11T) y, 11 Claims. 1

This invention: relates to improvementsin stone dressers.

An important objiectofv the Ainvention-is to e1imi nate the small, closely/*spaced bearings. of' the stone dressers of the prior art, which. wear. out quickly; particularly when the; machin-e rotates the stone at 10,000' R..P.. M. ormone; llnithemae chine herein disclosed', the bearings'are relatively large and well spaced apart.- and'v they assembly in.i cludes along sleeve. member, of. substantial dia ameter.

Another important object. is.` to2 prrivide a'. stone dresser wherein the` pilot. is centered: upon` the wal-ls of an. inverted conical recess inI a tapered, 'spring-held seat.. whereby the `stone is retained incorrect alignment sof that the: pilotiwillli not bea come' bent nor lit loosely within thief bearings therefor and, in consequence` willi nut wobble'. This. inverted. conical recess. permits the insertion ofpilotsof various sizes.A

Stillv another important object. iszto; eliminate the. cylindrical. dressing. barsl 'oi the; .printV art Aa major objectis; to provide projections orl lugs on they sleeve mentioned. which nt into recesses or notches in. the pilot.. such as the notches in the tapered? portion: of; the pilot. disclosed iir my United States Patent No.. 2,387,781; dated Ooi tob'er 30,. 1945, and: the notches in l the. tapered portion of the pilot; disclosecl in my application for.' United States patent, Seriali. Noi. 66'7.;586,.ti1ed May 6, 1946, now Patent No..2,4433489LdatedfJune 15,. 19.48,. for improvements in. grinding; tools. Thisv arrangement prevents relative' rotation` of the pilot. andiseat..

Another major object iste provide springnieans for the seat heretofore? referred' to, which; means has a secondV function in connection withy the lubrication of portions of the machine.

Other objects and advantages. of thev invention will be apparenti during. the course of. the following detailed description of the invention, taken in connection with the accompanying; drawings; forming. a portionv of this disclosure and in which drawings:

Fig.y 1 is a front elevation of thenevelf4 stone dresser.

Fig; 211s an end elevation there-lof.Y

Fig. 3 is a rear elevation: of the same:A

Fig. 4 is ai front elevation of af support formfing` part of. the novel. stone dresser..

Fig.. 5l is aV verticali section through: a; pilotare ceiving. and supporting.. means of? the new dresser.

6' isa topv plan. thereof.Y

Fig* 7 is: a horizontal; section.` thereof,l taken upon the line '1 -1 of Fig. 6.

Fig; 8 is a vertical sectionV through af dressing bar receiving and positioning means of the new stone dresser. .Y

Fig.` Qfis a horizontal. section thereof., uponfsubstantially the: line lie-e9v of Fig. 8.

Fig. 10 is` an elevation of a cover plate:- forming. ay part of the rneansshownnfFigs'. 8 and'Q.

Fig.. 1l is an elevation of a pressure plate form.- ing a part of the means shown in- Figsa 8 and9.

Figs. 12, 18 and 14 are sectiona'lviews of the lower end of the dressing bar of Figs. 8'A and 9 with aoutting device carried therebyl Fig.` lff is atop plan of a calibrated member mounted upon the support of Figs., 1'-, 2 and 3.;

Fig.` 1-6 is a diagram ofthe electric'Wiring. assooiated: with the novelY machine;

Fig. l-'l is a view, partly in. elevation and. partly in vertical sectiony ofthe pilot-receiving andv supporting. means of Fig. 5 but showing a pilotassociated therewith and afragment of one. cutting device in a cutting position.

Fig. 18` is an elevation of the means of Figsi.- 5 and 17, showing a secondv cutting device-inf a cutting position.

Fig. 19 isl a front elevation ofv the. supporty of Fig. 4 .but also including a guard wall vportici-1 with the latter swung to an openl position.y

Fig.. 201isy a top-plan of the same butt-the.l guard closed.-

Figs. 2'1"an'd122 are sections. throught the; lower orftreeend'` of af dressing bar showing az rn'odicali tion of the carrying. means. for ai cutting device, diiering from the showing in Figs. 12,. 1:3 and 1:4.

In the drawings,4 wherein forv the purpose: of.

.illustration is shown a: preferred embodiment of theinvention, and` a modification of oney part of the invention, the: letter A4 designates: the novel stone' dresser as al whole; B, a: cutting device; C, one forni of' cutting device holding andy locking assembly;v D, another form thereof; E, apilotfor association with themaohine A; and: F, ani electrio system for operation ofthe machine Ai The new stone dresser A1 includes a support Z5, which. may embody a bracket,l shown. merely in Figs'. to 4 inclusive andFigs.` 19.l and. 20: having a substantially verticallyedisposedwally portion' 2-6 and a. rearwardlyeextending', horizontally-disiposedfoot portion. 2.1 with! braces 2li4 extending from. the wall portion 2.6" to the-foot, portici-1;- 21. There may be provided also a forwardly: extend:- ing, horizont'ally-clispos'edv foot portionA 29t extendiing; from the bottom of` the wall. portion'. 215i I=f desired; there may be included a, suitable move ablel guard walll` portion wfsliowninFigs. 19a-nd 20,. which, inthe example shownt-is outwardly convex, is hingedly connected with the wall portion 26 at one end thereof, extends outward of that wall portion 26 and may be secured, by any approved latch means, to the opposite end of the wall portion 26. This wall portion 26 pref erabl,7 supports all of the stone dresser mechanism, and it and the guard wall portion 3u partly encloses a substantial part of this mechanisi This wall portion 26 may be provided with a plurality of openings as follows: A narrow vertically-extending groove SI, on substantially the vertical axis of the portion 26 and facing forwardly for receiving a lug for accurate positioning of the pilot-receiving and supporting means of the mechanism carried by the portion 26, a pivot means-accommodating perforation 32, a pivot means accommodating, narrow, horizontal slot 33, two major arcuate slots 34 and 35, one associated with the perforation 32 with its arc struck with the axis of the perforation 32 as center, and the other associated with the slot 33 having its arc struck with the center of the slot 33 as a center of the arc, and the arcuate portion of the slot 35 extending into a substantially horizontal slot portion, a plurality of screw-accommodating perforations 36 spaced from and disposed to either side of the groove 3|, and a minor arcuate slot 31 associated with and paralleling the slot 34 and spaced between the slot 34 and its associated perforation 32. Preferably the upper edge of the wall portion 26 is curved, forming two arcuate faces 38 with their arcs struck with the axis of their nearest perforation 32 and slot 33 as centers. These faces 38 support strips or bands carrying calibrating indicia as will be subsequently explained and may have screw-threaded sockets extending inwardly therefrom for screw means to secure these strips or bands thereto. Arranged as they are, the two faces 38 join, forming a V-shaped recess 36.

Three portions of the mechanism are supported by the wall portion 26. First, there is the pilotreceiving and supporting means shown mainly in Fig. 5. Preferably, this means includes an outer, preferably cylindrical body portion 46, split longitudinally, so as to provide the slot 4|, with a substantially smooth bore and cut away, at its outer face section opposite the face section containing the slot 4|, so that a at area 42 is provided, extending longitudinally of the body portion 46 from the center of which extends a lug 43 constructed and arranged to extend into the groove 3| in a snug fit therewith. Any approved means may be provided to cause the walls of the slot 4| to move toward each other and thus decrease the internal diameter of the body portion 40. In the example shown, there is provided a member 44 having a screw-threaded shank portion 45 and an exteriorly-carried handle portion 46 with the shank portion passing through suitable screw threaded perforation extending through the front wall section of the body portion 46 to either side of the slot 4| and opening into the slot 4|. Moving the handle portion 46 in one direction causes the slot 4| to close somewhat (and thus reduces the interior diameter of the body portion 40), and moving the handle in the other direction permits the body portion 46 to spring into its former position so that this diameter is enlarged. It is preferred to close the slot by a resilient strip 41 as of rubber. In order to secure the body portion 40 to the wall portion 26, there may be provided spaced-apart screw-threaded sockets 48 in the body portion 40, extending from the flat area 42, to receive the shanks of screws 49 which also extend through the perforations 36 in the wall portion 26. While these secure the portions 26 and 40 together, the contact of the lug 43 with the walls of the groove 3l and the contact of the flat area 42 with the face of the wall portion 46, contribute to retain the body portion against rocking or even against minor (but highly undesirable) vibrations.

Carried by the body portion 40 is an inner, preferably cylindrical body portion 56, somewhat longer than the former and, preferably, having a wall thinner than the wall of the portion 46. At adjacent its upper and lower ends, the portion 56 is interiorly screw-threaded, as at 5| and 52. Extending through the Wall of the portion 50 are a suitable number of screw-threaded perforations, closed by screw-threaded closures 53. These perforations provide openings for the injection of suitable lubricating means, as oil, into the chamber defined, in part by the wall of the portion 56.

Supported by the portion 56 is a rotatable assembly 55 including a tubular portion 56, longer than the portion 50 and of an outer circumference less than the inner circumference of the portion 56 so 'that the former is spaced from the latter. At its lower end, the portion 56 is int riorly screwthreaded to receive a screw-threaded closure 51, including a lowerrnost, exteriorly-disposed head 56, having suitable means to facilitate turning, as the walls of wrench sockets 59, and an uppermost, exteriorly threaded, interiorly disposed shank 66. Extending downwardly from the upper face of the shank 60 is a sump 6| and from the base of the sump a small-diametered vertical passageway 62 for drippings extends along the axial center of the closure 51 to the lower face of the head 58. Intermediate the length of the tubular portion 56 its outer face may be circumferentially grooved to receive a split ring 63 sprung into the groove but extending outwardly of the vertical plane of the outer peripheral surface of the portion 56, to limit upward movement of an abutment for an expansion coil spring to be subsequently described. Spaced above the groove last mentioned, the tubular portion 56 is provided with an outwardly extending, horizontal circumferential shoulder 64, for a purpose to be detailed. The upper end section of the portion 56 has a bevelled face 65 extending downwardly from its upper exterior edge to its inner face and constructed and arranged to receive, seated thereon, the tapered portion of the pilot disclosed in my United States Patent No. 2,387,787, dated October 30, 1945, and in my application Serial No. 667,586, filed May 6, 1946, referred to above. EX- tending radially from the upper end of the bevelled face 65 are small lugs 66, substantially 180 apart, to extend into the notches of the tapered portion disclosed in my United States patent and application for patent, referred to above. With these lugs 66 within the notches, the pilot will rotate with the rotatable assembly 55.

Spaced above the inner (or upper) end of the closure 51 is a seat 61 for the pilot shaft. This seat 61 is in the nature of a plunger slidable in the bore of the tubular portion 56, having an upper, bevelled face 68 adapted to receive the bevelled lower end of a pilot shaft and also functioning as a sump to receive grinding fluid drippings. From the axial center of thebevelled face 6B is a drippings passageway 69 opening into the lower face of the seat 61. Against this lower face bears the upper end of an expansion coil spring 10 with its lower end bearing against the upper face of the closure 51.

Extending about the periphery',` of the tubular portieri` 5S wherethe latter-enters` the lower end oflth'einner body= portion 50, is a relatively thin sleeve H of-i`suitablematerial to provide an oil seal, and having openings 1.3i to receive the lugs offa; conventional wrench for-thepurpose of removing-and placing the sleeve-H when necessary. The-- sleeve preferably extends below the horizontal plane of the lower edge of the inner body portion 50 with the sockets mentioned being in this protruding section of the sleeve 1l.

At the upper end section of the tubular portion ds-acolla-r 'I2 which mayhave lwrench lugreceiv'ing openingssubstantially-like-the openings '1'3-k andL the colla-r has outwardly-extending, horizontal flange portion 14 at its lower end, with theinner end section of the flange portion Miresting uponthe upper end-ofthe shoulder 6d. Exteriorly of the collar I2is a sleeve 'l5 of rublogerl or'tl`1evx like which functions in part as a closure forthe lug-receiving openingsr'lS.

The tubular portion 55 is preferably mounted for rotation by means of two ball bearing race assemblies 'l5 and 1l, with parts of the casings thereof pressed on the portion 5B and extending to the interior face of the sleeve portion 5B.

Outwardly' of(l the assemblies 'I6 and ll are suitable packing assemblies 'I8 and i9 and outwardly of theY assemblies 18 and 19 are ringshaped, split, closures 80 and" 8l. The closure SUL isI exteriorly screw-threaded for cooperation with the screw threads 5I and thev closure 8i has exterior` screw threads for cooperation with the screw threads 52; Each closure 8G and 8l mat7 be, provided' with wrenchprong-receiving sockets i in their outer faces.

Disposed upon the inner, movable portion of the casing of the ball'4 bearing assembly 'll (that is,v those, parts. of. the, casings` pressed,` uponthe tubular` portion) is the lower end of an expansion coillspringBZ with its upper end bearing against a; Washer 83 andV the latter, in turn, bearing against the protruding section. of the split ring 63.

The second and thirdportions of the mechanismy supported? by the wall portion 26 are much alike andlshownmainly in Figs. 8 to 11 inclusive. These second and thirdv portions. comprise the cutting devices supporting, adjusting and lockingmeans, there being two of such means (a lefthand means.- and` a right-handv means) diering only'inl the method; byA which they are movably supported bythe support 25.

Eachfof the cutting device supporting, adjustingandJ locking meansr includes considerable of the structure shown in Figs. 8 and9 particularly. Gommonl structureiinclud'es: a carrier and lever supporting member which may be an elongated bai-f90,` having a pivotal connection 9| at its upper end|` with a rod 92 slidably extending through the-rear end of a sleever, and rear end portion ofiwhich'hasa pivotal connection- 94; spaced forwardlyU of' theA pivotal connection 9i, withv a depending dressing` bar95= which, asmay be seen, particularly in Fig. 9ispolygonal intransverse section and not round.y It has four major sides and four attened` corners and isl slidably retainedina carrierga Theca'r-rier'gt is disposed intermediate-theends-of thel dressingbar 85 and the lower' end off the dressing bar carries either themeans `Bor-C, to`besubsequently described.

*rteferringuagain` to` the sleeve 93 which, with thesrod192 forms they lever; thefree outer endof` tiewfbrmer may carry-acenventionalltwo-buttonl electric switch laterv described andi may! house electric conductors ofthe electric-systemF.

Each-carrier 96 includes a major bodyl portion:

Sl' which ispreferably, a. block; of; suitable metal; having a longitudinally-extending groovefsiin': one face- (the-outer face) thereof, this` groove beingvery slightly more thany the greatestwidthi of the dressing bar 9'5 for the greater partaoffits: depth and walls of the groove 98 afterbeingfsub-u stantially parallel; converge forming.' subs-tan;-`l tially a right angleas maybe seen inlFig. 9; The converging walls slidably receive two faces:ofrthe dressing bar. The other two faces ofthe-flatten-rv are pressed by the con-verging faces. ofY a longl-l. tudinal groove itl in a pressure plate |00, shownA in Figs. 9 and ll, having, in itsfaceoppositetthe face from whichJ entendsi the groove 991; al plusl rality of spring-receiving socketsf lull.

' A- cover plate |92 covers` the forward facer-off the major-f body portionl 97. andcoversztheA presi` sure plate Elli?. It is secured tothe body. portions @l as by screws and-.a guide pin IDBlmay entendi through it and into a socket in the-pressureplate` lil@ to slidably retainthe latter in position; They inner face of the coverplate is providedl with-a: plurality of spacedapart spring-receiving sockets Mld' for expansion coil springs H15, whichalsoreXz-fV tend into the aligning sockets lilll inthelpress. sure plate, thus Vpressingthe latterinto goodl finiti-- tional contact with the dressing-bar 9.5;

Two end plates IBB are provided (with suitable,F openings for the dressing bar 959-1 tolclosethe: ends of the carrier andvv are securedj thereto; and may be secured tothe-cover plate Ill2 asiloy 7 suitable screws. A packing' sheet |01fmay'be\dis posed upon each of the-inwardfaces of the end plates.

In order to limit movement off' the dressing bar 95 in one direction, (downwardly) yet permit adjustments ofl such limit, an adjustable stop= |08".

may be provided, secured to one face of thadress-l ing bar above the carrier 96; This stop HI8-may: be a slotted bar, adjustably secured to the dresse-- ing bar 95 by screws with their Shanks passing through thev slotand-into screw-threaded sockets: in the dressing bar, while their heads bear-against the outer-face of the slotted bar. It is obvious: that downward movement of'the dressingl barf willv be stopped bythe-lower` endf of theslotted"1 bar abutting the upper endy plate |06'.

The left-handv cutting device` supporting,v ad justing and locking means includes one: pivotal= connection with the wall portionV 26 of the support 25. and two slidable connections whichl alsoL function to secure this means in adjusted posi-Y tions with respect to the wall portion 26*- The pivotal connection is preferably a shank lill having screw-threaded end portions IH" and H2 and a smooth intermediate,portion4 l I3. TheJ screw-threaded end portion IH extends into aj' screw-threaded openingV in the elongatedsupllolt bar 98, the smooth intermediate portion ll3'f is accommodated in the perforation 32 in the wall portion 26, and the'screw-threaded end I lj, pro-- truding from the back of the wall portion 26; accommodatesa nut H4' normally bearing against the rear face of the wall portion 2l5fand` provided] with suitable conventional wrench sockets.

One slidable connection is spaced from the pivotal connection mentioned and comprises a' screw-threaded shank H5 with one endeXtendf ing into a screw-threaded socket in the rear face of the carrier block or main body portion;A 9T, its intermediate portion extending throughy a per foration in the elongated'bar 9i); thenslidaby extending through the arcuate slot 31, and then into a screw-threaded opening through a nut H6, normally bearing against the rear face of the wall portion 26 and provided with wrench sockets.

The second slidable connection is spaced from the rst slidable connection and with the latter between it and the pivotal connection last mentioned. Preferably it includes a shank ||1, screw-threaded at its end portions ||8 and HS and with its intermediate smooth portion |26 encircled by a sleeve 2|. The end portion |8 extends into a screw-threaded socket in the rear face of the carrier block or main body portion 61. The inner end of the sleeve may be outwardly flanged and extend into a circular groove in the face of the support bar 90 abutting the portion 91. Set screws |22 extend into the supportI bar 9G at opposite faces thereof and engage the sleeve |2i, intermediate its ends. The sleeve extends, of course, into and through the arcuate slot Sil and its outer periphery, rearwardly of the wall 26 is screw-threaded to receive a nut |23. The screw-threaded end H3 of the shank ||1 carries a handled nut |24 with a washer |25 interposed between the nuts 23 and |24. This provides for an exceptionally secure means to adjustably secure the carrier and the dressing bar in various positions with the shank H8 as a pivot. There are, as is now clear, three separate means to secure the carrier in a locked position so that it is not apt to become loosened, due to vibrations. By loosening the nuts H4, IE6, |23 and |24, the carrier 96 and its dressing bar 95 together with the support bar E@ and the lever connections 9|, 92 and 93, may be pivoted, as a whole, limited only by the lengths o1" the slots 34 and 31.

Now, referring to the connections of the righthand cutting device supporting, adjusting and locking means, these connections differ from those o the left-hand means as may be seen, particularly in Fig. 3, only in the omission of the shank H and nut H6, but the smooth, inter-- mediate portion H3 of the shank extends through the slot 33 and not through a perforation and the sleeve |2l is adapted to extend through both the arcuate and straight portions of the slot 35. This permits both a pivotal movement of the right-hand cutting device supporting, adjusting and locking means, as well as a horizontal sliding of this particular means from left to right and vice versa.

In order to properly adjust the two cutting device supporting, adjusting and locking means, there is provided, for each edge 38 of the wall 26 a strip |30, as shown in Fig. l5 containing suitable indicia as the degree figures |3| and division marks |32. They may be secured to the edges 38 as by screws. An index in the form or an arm |33 may be secured to each support bar 96 and positioned to move over the strip 30 with which it is associated.

The cutting device B may be a diamondpointed, screw-threaded shank |35 with a knurled hea-d |36.

Referring to Figs. 12 to 14 inclusive, the preferred form of the cutting device holding and locking assembly C, is shown to include an interiorly screw-threaded, split sleeve |31 surrounding the intermediate portion of the shank |35 and extending into a suitable opening |38 in the dressing bar 95. This opening |38 preferably extends with its axis forming obtuse angles with the adjacent faces of the dressing bar, and its axis is inclined from the longitudinal axis of the dressing bar, as shown in Fig. 12'. Consequently the longitudinal axis of the shank |35 is also inclined with respect to the longitudinal axis of the dressing bar. A set screw |39 may be employed to assist in securing the split sleeve |31 in place and tends to compress it. Associated with the split sleeve |31 is a major locking device |46, comprising a shank Ml, screw-threaded at one end and to which a knurled nut |42 is secured by means of the screw threads. The free end i613 of the shank till is enlarged over the intermediate portion of the shank with the enlarged end providing a cam surface at the juncture of this end |43 and the intermediate portion of the shank. The shank MI is constructed and arranged to be inserted into a suitable bore |44 in the dressing bar, spaced above the opening |38 and with its axis normal to the axis of the opening 538. This insertion may be made, since the nut M2 is removable. rlhis nut bears against a block |635 which has a bore for the shank |4| and a substantially V-shaped slot in the face opposite its nut-contacting face, with the slot accommodating an edge portion of the dressing bar as may be seen in Fig. 14. As the shank |4| is drawn to the right in Fig. 14, upon tightening of the nut the :am surface bears against the sleeve |31, as is clear in 13, and causes tightening of the sleeve and prevents longitudinal movement thereof. Obviously rotation of the head |36 will feed the diamond point toward or away from the dressing bar 95.

Referring now to Figs. 21 and 22, wherein the modied form C of the cutting device holding and locking assembly D is shown, the same may be associated with the cutting device B and the dressing bar 95 described. A screw-threaded opening |5L extends through the dressing bar S5 adjacent its lower end, with the lonffitudinal axis thereof inclined with respect to the longitudinal axis or the dressing bar and forming obtuse angles with the adjacent faces of the dressing bar. Above this opening |53 is a second opening |5|, normal thereto, and accommodating the enlarged free end |52 or" a shank 58, with the intermediate portion of the latter reduced in circumference so that there is provided a recess |54 dened by the walls of the opening |5|, intermediate portion of the shank |53 and inner end of the enlarged free end |52, in which recess is disposed an expansion coil spring |55 bearing at its inner end against the enlarged free end |52 and bearing at its outer end against a block |45 substantially similar to the block M5. The shank |53 extends through the block M5', is screw-threaded at its outer end, and accommodates a nut |56 which may bear against a washer |51 contacting the block |45. Referring again to the enlarged free end |52 this is provided with a cam face constructed and arranged to engage the shank |35 of the abrasive device B when the nut |56 is tightened, hold the shank |35 against rotation.

The pilot E is shown in Figs. 17 and 18, merely by way of example and is described in detail in my United States Patent No. 2,387,787 referred to above. It includes a shank |60 which may be bevelled at its free end ISI and this end is adapted to seat upon the novel seat 68 of the stone dresser A. Notches described in my United States Patent No. 2,387,787 accommodate the lugs 65 and, above the notches, is the stone, such as the stone |63 to be worked. Above the stone |63 is shown a exible coupling |64 having a recess to receive a suitable means, as the spindle 0r shaft |65 operatively connected with a suitable- `source of power Sto -rotate Athe spindle r:|35 Land, iconsequently, the coupling .1.54, V'stone |63, "shank A|60 andthe rotating `.portions :of the novel stone dresser A.

The` free end .of i each sleeve .931nraybeprovided `Withra conventional electric `lvs-Witcl'i |10., with vone pole connected, as shown in Fig. 16, with `the .power line rconductor lill .and 'from the .other connected With 1 conductors ',lf'l2 `extending `to fone `side of a suitable electricmotor |513, there being va vconductor |14 electrically connected .with'the other side of the motor `and i'extending .to Ithe other power 'line conductor |15. Ihe'lmotor |13 is :adapted to rotate the '.pilot, iby .means :of the shaft |65.

vIt is now obvious that, :by l.mm/'ingthe handle 46 to cause the split vcylindrical Abody-.portionill) to expand circumferentially, .the-innerbody portion 50 may be raised cir-.lowered manually "and the Wall of body-portionf'fill againfclamped thereabout. This provided ',vertical .adjustment lfor the portion 50 ywith respect to 'the ixed ybody portion 40 and, of course, .vertical `adjustment of thefportons carried by theportion 150. In Figs. 1'7 .and 18 there are shown two vertical `adjustmentsy of `the portion .E iwith respect to ;the Vportion 4|).

A veryriirmirictional engagement of ythe shank |60 with the seat B1 is provided, notfonly `by the bevelled surface '.68 .of the latter, .but the expan sion'coil'spring "lll tends *.to force'the seat 61 upwardly. 'I'his spring 'l0 :also functions ras an 'oil splashefr for adiacentrotating.portions of the irachine, since oil may be :introduced r,and drained through the openings closed bythe screw-thread ed closures .53.

'In-.the event the left-hand lcutting device supporting, adjusting and locking means is to be ernployed, the operator loosens the nuts IIA, I'IB, |23 and |24 'and this permits rotation :of rvthe means on lthe vpivot ||0. When the vmeans has been swung toa proper position so that the kstone |63 twill not Contact the diamond pointwhen .the former is `placed in positionfor dressing, nuts `|1|l and |23 are thereupon tightened. By manipulation of the lever sleeve 293 (drawing down on the free lendrof the sleeve) thedressing 'bar will lowerthegcutting device 'B belowa position to be taken'bythe stone. The pilot is next inserted as in Fig. '17. The handle '46 'is -neXt manipulated to permit the'body portion "40 :to expand circumferentially and the innerbody portion d is lown ered to a location Where the stone yis lin position to lbeicoritaeted-by lthe diamond point. The portion Sii is now locked 'in-position. Final acljustment of the dressing bar and adjustment vof the rcutting device B are next effected. The latter is now locked into position by the holding and locking means C or lD, `as the case may be, andthe nuts ll-and i241 tightened. The shaft |565 is'noW operatively connected With the pilot E and the electric circuit to Ethe'motor 113 'is closed by manipulation of the switchlat vthe end of the lever sleeve '93. It `is now clear that manual manipulation vof this lever sleeve lvvill cause proper contact of the diamond point With the stone.

In order to correct van-error'in the angle rof `the diamond-pointed shank of lthe cutting device, with respect to the stone-s-surace, the nut 'l l5 is loosened andthe set screws '|22 manipulated to efi'e'ctsuch correction,'-whereuponthe inut ||6 is again tightened.

`Since -the-right-hand cuttingfdevice supporting, adjusting and locking means -isomployed, ma

-nipulation thereof ais, 'in part, similar `v 'to ythat Yof Atheleit-hand means, fexcept'thatther'eis no intermediate :nut and the entire t.means `may be moved horizontally .alo-ng :the horizontal portion of the slot :35'andftheshorizontal slot.33 `to-cause the diamond .pointof Y.this frightahand means to approach `the kstone :along a 'horizontal lin'e. Obviously, this right-hand means .may take the vertical position 'shownormayitakeafpositioninclined fromthe vertical.

Various 1 changes ,may bel made fto the :forms of the invention.herein-shownand d'escribedzwithout .departing from the spirit :of the 'invention :or scope of theiclaiins.

What is claimedlis:

1. In a dresser for a stone mounted upon 'a pilot shaft, a .support iand fpil'ot .fshatreceivingand-supporting'means vceofriedfloythe: support and includingan outerfbody portionfhaving a longitudinal bore, 4an .inner tbody iportion, fslidable longitudinally of said bore, 4ni'eans5to'rretainsaid inner body .portion Ain various selected position-s longitudinally of said router ibody iportion, sand fa rotatable assembly, rotatably carried "by `said inner body portion, including fa tubularp'ortion having an open end,.a pilot shaft-receiving :seat within Asaid tubular :portion :and slidable longitudinally 'of said l'tubular portion, and `resilient means `urging said seat towardfsaid yopen i end.

2. In a dresser for astone `mounted lupon :la pilot shaft, a support land :pilot .shaft-receiving* and-supporting meansicarried bythe lsupport and including :an outer body 7portieri fha'ving `a `.longitudinal bore, an inner body iportion, slidable longitudinally of said bore, :means :to :retain .said inner body .portion in vv.various fselected positions longitudinally of said outer f body portion, and la rotatable assembly, .rotatably carried by said inner body portion, :including la tubular portion having an open end :and faiclosed end, a pilot shaft-*receiving seat within -said :tubular portion spaced from both'of said ends'andslidableflongitudinally of -said 'tubular portion, 5and resilient means urging said seat .toward 'said open end; said resilient means :being disposed `betvveen said seat and saidclosedend.

3. In a dresserfor astone mounted-upon apilot shaft, a support and Apilot .shaft-receivingand-supporting means carried'bylthe support and including an outer body portion having 'a longitudinal bore, an inner 'body portion, 'slidable longitudinally of saidbQre, means :to retain Lsaid inner body portion 1in lvarious selected positions longitudinally of lsaid outer body portion, and -a rotatable assembly, rotatably carried iby said inner body portion, 'including va, tubular portion having an open end and a vclosed end, la pilot shaft-receiving seat within said tubular portion and slidable longitudinally A'of said 'tubular :portion and having a'b'eveledseating surface "facing toward said open end and fa 'lubricant receiving passageway extending from said surface to the surface of said seat facing said closed end, said last named surface, closed end .and :adjacent portions or' said tubular portion 'detlning a iubricant reservoir, said seat being fslidable longitudinally of said tubular portion, and "means to resiliently urge said .seat toward said :open end.

4. In a dresser for a stone mounted upon a pilot shaft, a support .and :pilot fshaftereceiving and-supporting meanscarried by the support and.

including .an outer V.body lportion 'having .a lengt-- tudinal bore, van inner body'portion, slidable rlongitudinally of said llacra. meansto retain 'said 1ini ner bodypor-tioninvarious selected.positionslongitudinally of said outer body portion, and a rotatable assembly, rotatably carried by said inner body portion, including a tubular portion having an open end, spaced-apart friction-reducing means between said tubular portion and said inner body portion, including casings fixed to the outer periphery of said tubular portion, a spring abutment extending from the outer periphery of said tubular portion and spaced from one of said casings, an expansion coil spring bearing, at one end, against one of said casings and bearing, at its other end, against said abutment, a pilot shaftreceiving seat within said tubular portion and slidable longitudinally of said tubular portion, and resilient means urging said seat toward said open end.

5. In a dresser for a stone mounted upon a pilot shaft, a support and pilot shait-receiving-andsupporting means carried by the support and including an outer body portion having a longitudinal bore, an inner body portion, slidable longitudinally of said bore, means to retain said inner body portion in various selected positions longitudinally of said outer body portion, and a rotatable assembly, rotatably carried by said inner body portion, including a tubular portion having an open end, spaced-apart friction reducing means between said tubular portion and said inner body portion, including innermost casings xed to the outer periphery of said tubular portion and outermost casings xed to the inner face of said inner body portion, said casings and the adjacent portions of said inner body portion and tubular portion providing an oil reservoir, a spring abutment extending from the outer` eriphery of said tubular portion and spaced from the innermost casing farthest from said open ond, an expansion coil spring within said oil reservoir, bearing, at one end, against said last-named casing and bearing, at its other end, against said ment, a pilot shaft-receiving seat Within said tubular portion and slidable longitudina y of said tubular portion and resilient means urging said seat toward said open end.

6. In a dresser for a stone mounted upon a pilot shaft with the shaft having a recess at adjacent its juncture with the stone, said dresser including a support and pilot shaft-receivingand-supporting means carried by the support and including an outer body portion having a longitudinal bore, an inner body portion, slidable longitudinally of said bore, means to retain said inner body portion in Various selected positions 1ongitudinally of said outer body portion, and a rotatable assembly, rotatably carried by said inner body portion, including a tubular portion having an open end provided with a lug constructed and arranged to extend into said recess, a pilot shaftreceiving seat within said tubular portion and slidable longitudinally of said tubular portion, and resilient means urging said seat toward said open end.

7. In a dresser for a stone mounted upon a pilot shaft, a support; pilot shaft-receiving-andsupporting means carried by said support, including a rotatable seat for said shaft; a dressing bar; a stone-dressing device carried thereby; and supporting, adjusting and locking means for said dressing bar, pivotally carried by said support to permit movement of said dressing bar so that the longitudinal axis of said dressing bar will intersect the axis of rotation of said seat, including an elongated bar pivoted to said support, a lever pivotally carried, at one end thereof, to one end of said bar, a pivotal connection between said dressing bar and said lever, and a carrier supported by said elongated bar and provided with an opening slidably accommodating the intermediate portion of said dressing bar, said carrier having a spring-urged pressure plate bearing against said intermediate portion of said dressing bar.

8. In a dresser for a stone mounted upon a pilot shaft, a support; pilot shaft-receiving-andsupporting means carried by said support, including a rotatable seat for said shaft; a dressing bar, polygonal in transverse cross section; a stone-dressing device carried thereby; and supporting, adjusting and locking means for said dressing fbar pivotally carried by said support to permit movement of said dressing bar so that the longitudinal axis of said dressing bar wiil intersect the axis of rotation of said seat, inciu ing an elongated bar pivoted to said support, a lever pivotally carried, at one end thereof, to one end of said bar, a pivotal connection between said dressing bar and said lever, and a carrier supported by said elongated bar and provided with an opening, of the same shape as the transverse cross sectional shape of said dressing bar, slidably accommodating the intermediate portion of said dressing bar, said carrier having a spring-urged pressure plate bearing against two adjacent faces of said intermediate portion of said dressing bar.

9. In a dresser for a stone mounted upon a pilot shaft, a support; pilot shaft-receiving-andsupporting means carried by said support, including a rotatable seat for said shaft; a dressing bar, polygonal in transverse cross section; a stone-dressing device carried thereby; and supporting, adjusting and locking means for said dressing bar, pivotally carried by said support to permit movement of said dressing bar so that the longitudinal axis of said dressing bar will intersect the axis of rotation of said seat, including an elongated bar pivoted to said support, a lever pivotally carried, at one end thereof, to one end of said bar, a pivotal connection between said dressing bar and said lever, and a carrier supported by said elongated bar and provided with an opening, of the same shape as the transverse cross sectional shape of said dressing bar, slidably accommodating the intermediate portion of said dressing bar, said carrier having a springurged pressure plate, provided with a substantially V-shaped recess, with the surfaces of said recess bearing against two adjacent faces of said intermediate portion of said dressing bar.

10. In a dresser for a stone mounted upon a pilot shaft, a support having an arcuate slot and a pivot-accommodating opening; pilot shaft-receiving-and-supporting means carried by said support, including a rotatable seat for said shaft; an elongated dressing bar; a stone-dressing device carried thereby; and supporting, adjusting and locking means for said dressing bar, pivotally carried by said support to permit movement of said dressing bar so that the longitudinal axis of said dressing bai` will intersect the axis of rotation of said seat, including an elongated bar, a carrier mounted thereon with said dressing bar slidable longitudinally therethrough, a pivot extending through and outwardly of said pivotaccommodating opening, and secured at one end to said carrier and provided with screw threads at its other end, a nut upon said other end and normally bearing against said support, a shank assembly extending through and outwardly of said arcuate slot, through said elongated bar and .secured at p ne end to said carrier, its other end 13 being screw-threaded, a nut assembly upon said last named screw-threaded end and normally bearing against said support, and means to reciprocate said dressing bar.

11. In a dresser for a stone mounted upon a pilot shaft, a support having an arcuate slot and a pivot-accommodating opening; pilot shaft-receiving-and-supporting means carried by said support, including a rotatable seat for said shaft; an elongated dressing bar; a stone-dressing device carried thereby; and dressing bar supporting, adjusting and locking means pivotally carried by said support to permit movement of said dressing bar carried by said supporting, adjusting and locking means so that the longitudinal axis of said dressing bar will intersect the axis of rotation of said seat, including an elongated bar, a carrier mounted thereon with said dressing bar slidable longitudinally therethrough, a pivot extending through and outwardly of said pivot-accommodating opening, and secured at one end to said carrier and provided with screw threads at its other end, a nut upon said other end and normally bearing against said support, a shank assembly extending through and outwardly of said arcuate slot, through said elon- -said support, and means to reciprocate said dressing bar.

PAUL WEYNAND.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,987,812 Albertson Jan. 15, 1935 1,992,768 Pioch Feb. 26, 1935 1,999,435 Albertson Apr. 30, 1935 2,302,921 Spencer Nov. 24, 1942

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