US2608189A - Grinding wheel dresser - Google Patents

Description

Aug. 26, 1952 E. v. sTATlA, SR

GRINDING WHEEL DRESSER FiledA. May 18 1950 Gttorneg Aug. 26, 1952 E. v. sTA'rlA, SR

GRINDING WHEEL DRESSER SHEETS-SHEET 2 Filed May 18, 1950 G tornegs Patented ug. 26, 1952 33.2

loisir-'so "srArs 2,608,1se e f GniNniNG WHEEnnnEss'azf.3.-f 'Y v 4 y t Edwin Visana, sr.; Royal-cammen assigner of one-half to Edward L. Chapman, Detroit,

Mich.

Applicants May is, 1950, serial no. 16:2;731

v Y 1 This invention relates to grinding Wheel dress- Yers and, in particular, to dressers for dressing the peripheries of grinding wheels to curves of arcu ate cross-section.y 4 'A Y @ne obje-ct ofithis invention is to provide a grinding kwheel dresserv` which will .impart a grindingsurface ofarcuate'or rectilinear crosssection to the periphery of a grinding wheel, the :device being so constructedv that itA can be rnountn ed in IeithervoiL two positions" at yrightv angles to eachother so as to enable the device'to be used .en different types ofl grinding machines,l where VAits/usein one position wouldbe unfeasible. i

.i Another object ris to provide. a grindingv Wheel vdresserflof the. 'rforegoing character wherein'the vdressing tool point may be tilted and swung in :an arcuate lor rectilinear path, ora Combination ofarc'uate and rectilinear paths, by operating ,rnechanisrn which is located' remote `from the ydressing tool,' thereby'eiia'bling the dressing tool Ato be inserted andto engage the grinding wheel an otherwise inaccessible location.v ,Another object is to provide'a grinding wheel ,dresser of theforegoin-g character'wherein the grinding wheel dressing tool point may be locked -inpositionor :unlocked by release mechanism which is likewise remoteifrm the'dressingYL tool point, this mechanism, aswell as the mechanism for swinging theY point` in jan arcuate or recti- .linearvpath inleither of'two positions at right anglesY to one another, lying .Wholly inside the level of the supporting surfacey of the base so as tof be '.'free from conflict With portions of the grinding machine when it is mounted in the grinding machine and ready for use.

' @In the drawings: Y.

Figure l is a central vertical section through a grindingwheel dresser, according to' one :form

of the invention,- taken along the line "I-l in .Figure 5,- vvith the finger grip on the handelever swung intotheplane of the paper fpFigure Zi's a top pian View of the vgrinding .wheel dresser shownin'Figure l, partly in hori- Qaontal section to disclose certain locking devices; 4` Figure 3 is avertical cross-section taken along the line v34? in Figure` l', showing a portion of fthe mechanism .for reciprocating the inner slide;

Y Figure 4 is a fragmentary front elevation of the grinding Wheel dresser of Figure 1, looking '.from the left-hand `side thereof, with the dress- `ing vpoint and Vcontrol handle omitted;

Figure `5fi`s a fragmentary rear elevation of the egrinding wheel dresser shown in Figure 1,'with t efcontrol handle likewise omitted; and

Figure (i is `aho'riz'ontal jsectiontaken valong the A.

7 Claims. (algien-11) .the operation another.

l nfFigure 5, lshowing aportionofthe slidelegk operatinemhafsm- Y *7 itliertl jhe provisin of a grinding Wheel dresserfcapable .of lcutting arcuate or rectilinear portions cna grinding wheel and adapted to it diierent makes-oigrinding machine andto "op erate in `Adifferent positions necessitatedl by. vthe diering construction of these .machine'sjihas v .A i,r ult problem. In the priorfStatia RatentmNos, 2,336,758 of December 14.1943-[ad zfieofigeefrqfuuiy 23,. 1946,' two very efficient grinding wheel dressers ofl differing constructions have been disclosed, and these operate ver'y'satisNfactorily n when the grinding .wheelis accessible fromV a certain position. Where, however', the grinding Wheel is inaccessible from that position, such as w-henjthe wheel must l'be dressed orftrued 4from a location beneath the wheel, these .prior :dressing tools are inconvenient to use, sincfthe control mechanism lis either inaccessible'oris interfered withfvby. portions of Mthe' machine.

The presentinvention provides a grinding Wheel can beused in either of 'twor positions 'atff'right anglesV tovv one another without interfering? with of its operating mechanism'.

, Referring tothe drawings indtail, Fi'gii'r'nesLly tofs inclusive show a grinding" wheelfidres'ser,

generallydesignated l0, accordingtoone form of the invention as mounted upon a base j [with feet.- l2 projecting perpendicularly therefrom.

EThe outer'surfaces l'and I"4."of the ba's'ef'l Fand feet I2 are machined 'to' Yaccurately flat y`surflicges and also to be. accurately at right angles tojfone EitherY of thesesurfaces [i3V vollf'fi serves asfa surface of lreference which may' be Aclampedagainst, the 'bed or lother portionjofla c Y, time grinding Wheel in r r an "accuratefpredeternnned direction.

Y,"'lhe feet Vi2y maybe clamped tothemachine -bedby the'use of suitable clamps; Asuch n as Tbolts, and the base Il is provided'with spaced edge notches l5 `opening ,intoboltfheadpockets l' (Figure 5) vfortl'iesarne purpose. `"I*1fie"op r 'ating mechanism o'f-thedressing tool ofrthepreslent invention is so arranged-that no portiongof it projects outwardly beyond the` plane ofjthe base surface YISfoiil leg su'rfacesjlll so asftp'b'e interferedwithrsby portionsiof 'the'l machin to which itis.clan'iped-I (One portion offthe't'ool operatingr handle seen., immediately below; -:the figure vcaption of Figure l appearsvt'oip ct e'- bore I9 is the hub 2I of a disc-like head or drum 22. the rearward surface 23 of which abuttingly Y engages the base surface 20. A'Ihehead 22 is provided with graduations 24 (Figure 2) such as in degrees, and the base edge I8 is provided with an index mark 25 registering with these gradual tions 24 and indicating the amount of tilt to which the head 22 is rotated. Arching above the upper half of the recess I1 is an arcuate boss 25 (Figure l) which projects above the levelv of the bottom surface 21 of the lcavity I1 and half surjrinde @he here la. The hub 2| `ofthe head` 22 threaded as at 28 (Figure 1 to receive a correspondingly threaded retaining ring or annular hut 2S by which the rearward surface 23 of the heldin abutment withthe forward 'strisce zu of the 'base Il. whi1e permitting free rotation jef the head zz. The retaining ring 2 9 isrotated vinto position by means of an ordinary Spanner, the pins of whih engage corresponding recesses 3II in the ring29 (Figure 1). Seated in the socket 32 in the rim of the drum 2 2iseredia1 contact pin 33 (Figures 1 and 4). 'f he 33 is engageable with adjustable stops 34 2 5 which are arcuately slotted lto engage an arcuate rib 35 ef d ovetail cross-section partially #regeling .the head2? ndeC/ued. es by the screws 3 1 to tl ie forward surface 20 of the base I 'I. The dovetail rib 36 is in theform of an arc of a circle having its center` located on the axis of rotation of the drum or 'head 22. The stops all 'and #are .provided with clamping Screws 3.8 whereby Ytliey may be secured atany portion of the rib j36 lso as to limit the rotation of the-'head A22 tofar 1y desired extent and thereby to correspondingly limit the swing ofthe dressing point foij `c rystal. The opposite sides of the rib 36 ap- 'proach closely to the opposite edge faces 30, 3l ofgthebasell.

ln order to clamp the head 22 in any desired Qqsitiori'of rotational adjustment, the base II is proyidd 'witha threaded bore 40 which is radial 'fai the bereit and extends into `the cavity yI1 (Figure 2). Threaded into the threaded bore 40 is the threaded shank'of a thumb screw 4I, the innerend o f which engages the periphery of the retaining ring`j 29. Projecting from the forward side or face 42 of 4vthe head 22 is a do'vetau rib 43 which emergenti gages a corresponding dovetail groove 44 in an "er 'or rearward slide 45, both the rib and the fgroci'v'ie '4 4fextending diametrically across the head y22. 'l'lie s`lide '45 and consequently the head 22 arjrotated by diametrically opposite knobs 46 ,'eea'te i in sockets n in the rim or the slide 4s. A'I 'he slide, `t5/'is preferably circular orjcylindrical like 'the dru'm `or head 22, and on its forward `iface `4 8 is provided with a dovetail rib 49 which niges a' corresponding dovetail groove 50"in 'an jitr or forward slide'or cross-slide 5I. The

'rib arranged atri'ght angles to therib 4 3 '(Figures 41, 2 Yand 4) Yso that the forward slide 45 reeipifocated in'a path perpendicular to the; rearward'slide l45'. The forward slide 5I isradlally slotted as at 52 (Figure 2) and the opposite halves of the slide 5I divided by the slot 52 are clamped together by a clamping screw 53, the shank of which extends through the bore 54 and is threaded into the bore 55 on the other side of the slot 52. I'he clamping screw 53 clamps the forward slide 5I at any desired position along the dovetail rib 49 on the rearward slid'e' 45.

Extending forwardly fr'oi the forward or outer slide 5I is an integral post 56 (Figures 1 and 2) which is bored as at 51 in a direction slightly inclined relatively to the axis of rotation of the head 22 and receiving the rod-ilke shank 55 of a dressing crystal or point holder 59 which is bored transversely as at 6U to receive the dressing point mount 5I. The latter is in the form of a rod having a. tapered end 62 in which a dressing point or crystal 63, such as a diamond, is seated. Set screws 64 and 65 mounted in the post 55 and holder 59 serve to clamp the shank 58 and mount 6I in 'their positions of adjustment. The rearwaidslide 45 is moved to and fro along the dovetail rib 43 by a rack 10 (Figures 1 and 4Zi) pinned to the upper edge of an elongated tangula'r cavity 1I in the rearward slide' 45 and provided Awith a locking notch 'or recess 12 ci 'wedge-shaped cross-section (Figure 2) extending forwardly toward the rib 49.

Engageable with thelocking notch or recess 1 2 is a correspondingly shaped locking rib or'pojection 13 also of wedge-shaped cross-sectionnd formed on theforward face of 'an axially slidable pinion 14 meshing with lthe ra'clc 1U. The rack 10 is considerably thicker than the pinion 14 so as to permit sliding motion of theteeth vof the pinie'n ,along the teeth ortherak 'within the cavity 1I. The hub 15 o f the pinion 14 is slidvable to and Afro in abore 1B (Figures 1 'and '2) and is urged forward Vby a helicalspring 11 surround'- ing the rod or shaft 1s von 'which the huh 1s er the pinion 14 is mounted, the spring 11 being h oused lin 'the bore 15; The pinion yshaft 1l passs through ajaxial bore 19in 'the center of thehub 21 q f the head -22 (Figure 1) and itsouter end 'is provided with a threadedV 'socket teinte, which is threaded the sh'nnir er 'arrivee screw 8I.,A Keyed to the rearward end* of the shaft 1s isa pinion a2 by which the shaft 1l and pinion 14 'are rotated in order to 'reciprba'te the raclc Wand rearward slide 45. Meshing-with the pinion 82 for this purpose 'is la'quadrantgcefar portion ssen thelowerena er a lever a4 whieh is bored "as "at 85 (Figure 1)' to receive the head of a pivot screw as, the shgnk er which "is threaded into 'a threadedbore 81 in tHe-arcuate boss 2 6 projecting rearwardly from the upper portionof thfebase'l I.

The iefyejr sja-is provided with tubular 'portion '88 (FigiiiS 1 and 5) which is threaded 'at its upper end as atj 8 9 ltoreceive a retaining screw by which a cup-'shaped handlecap SI i's-held lupon the end of the 'tubular portion 8B of the lever. 84. ,The handle ycap 9| is provided 'with fsocke 52 in which the uppr end of as'leve 93 reciprocates 'I he sleeves! ls bredf'a'sa't 54 'to receive the tubular portion 88 of the lever 84, and is prbvidedwith radial bores 95,1`I'1whi'ch the opposite ends 'of L'a diametral pin 95 are seated. Ifhje pin 9 6 I'passes through aligned Aslots 31th the tubular portion 880i the lever 84'(Fig'ure '15) and alsofpass through a diametr'al hole Y 95 ih a recipro'c'able V'rod 99 'slidably-inounted within the v"bore -in'n Aofthe hibuia'r pordenone: 'theiever it ..1n-.iriaio-,reirrocrerhe sieve airw- 'te'r is'provided withan 'annula'rgrovef` ID'I- "which disposed diametrically rof -the--sleeve 9,3. 4iThus, with the palm of-thehand.resting-againstthe' handlecap 9| andthe fingers ofthe operator grasping the ngergrip -|02,\the sleeve^|03 and the rod 99 may be raised andlowered to -operate the locking mechanism of the rearward vslide45. The lower-or inner end-of-the rod-99 is slotted as at |04 (Figure 1) tolreceive alink |05 connected theretoby a pivot pin H362y PivotedY as by the pin |01 to the link |05 is a pair of links |08 which in turn are pivoted as at |09 to a link ||0, the lower end of whichis bored to-receive a pivot screw the shank of which is threaded into a hole ||2 in'an earA ||3 (Figure 5) projecting upward fromthe upper end of an open rectangular reciprocating cam ||4f havingacentral approximately rectangular opening` ||5A therethrough. Extending inwardly from the opposite long sides of the opening ||5 are'twc inclined cam ribs IIB. These slidablyfengage a pair of correspondingly inclined grooves ||'|`1in a block ||8 which is bored and counterbored" as at ||9 (Figure 6) to receive the head ofthe pivot screw 8|. A tongue |20 extends forwardly from the inner edge of the cam ||4 and serves as a stop to engage the outer surface 21 of the retaining ring 29 and prevent the cam I I4 from tilting into an inclined Vposition and ljamming against the quadrant or sector gear portion 83;

, n "y Operation Y y In the operationrof the invention, let it first be' assumed that the periphery of the grinding wheel is to be dressed with the simplest form of surface, namely a cylindrical surface, thev elements of which are perpendicular to the side faces of the wheel.l To so dress the wheel, the 'forwardslide 5| is moved upward or downward on the forward dovetail rib 49Y by loosening! the .clamping screw 53 so that the dressing crystal or point63 lies adjacent the peripheryofthe grinding wheel Vin a position adapted to take the desired depth of cut from the periphery of the wheel; Itis as#- sumed',A of course, that the base has been firmly secured to the bed of-the machine, as by' clamping the legs |2 firmly thereto. It is also assumed that the head 22 has been clamped, by means of the thumb screw 4l, shown in `the position of Figure 2, with its zero graduation v24 coinciding with' the index mark 25.r In this position,vthe `rearward.

dovetail rib 43 is horizontal, so that the rearward slide 45 -will move to and fro horizontallyl Let it also be assumed `that these parts are in the position shown in Figures l and 2, with the locking rib 'I3 urged forwardly into the locking notch 12 by the helical spring 11. f I 1 l To unlock the 4rib 13 from the notch 12, the operator grasps the cap-9| in the palm of one hand and pulls upward with hislingers upon `the finger grip |02. This action reciprocates the rod 99 and the` open rectangular cam ||4 upwardly, causing its inclined ribs IB, by theirl engagement with the inclined vgroove |I'| in theblock ||8 Ato move the blockll'outward (Figure l). This action shifts the shaft 18,` pinion 14 and rib i3 outward to the ri ght,'withdrawing the locking rib 13 from the locking notch 12.1 The operator then swings the handle cap 9| in an arcuate path, thereby rotating thepinion 82 through its coaction with the sector gear portion 83"`of the lever 84, consequently rotating theshaft 18. and pinion 14. The coaction of the .pinion 'I4 with the rack '|0- reciprocatesv the .inner bri rearward. slide. 451

l surface.

horizontally along the inner dovetail rib 43, cause' ing the dressing crystal orpoint v|i3-to-move `in a rectilinear path across the edge` oflthenwheel; dressing or truing it to a cylindricaLfor straight grinding periphery. l. 11.1

To cut o'r dress a beveled periphery onthegrind-` ing wheel, the operator .follows` the: foregoing procedure except that he loosens the thumbscrlew 4|, rotates the head 22 by the. knobs Miuntilzthel proper graduation 24'expressinguthe` amountofy bevel desired for the grinding edge of the grinding wheel is placed opposite the index mark 25, after which he tightens the lthumb screw 4|.. When he now lifts the hand grip |02 andA again swings. the handle cap 9| in an arcuate path, the lockte ing rib 13 is'again withdrawn from the locking. notch 12 and the inner or rearward .slide.45 re-y ciprocated along the rearward dovetail ribv 43, this time not in a horizontal path but inaninf' clined rectilinear path. The dressing vpointLor. crystal 63 is thus caused to travel across. the periphery of the wheel in a path inclined to ther axis of rotation thereof, thereby. beveling. the periphery of the wheel with a conical grinding Y To dress the periphery of the wheel with -a concave or convex surface, the operatorrst locks the rearward slide 45 in its central position. (Fig. ure 2) by' letting the rib 13 enter the notch 12. He then loosens the clamping screw `53 and moves the forward or outer slide 5| upward ordown-f ward the desired distance so that .the-tipof'the the dressing point or crystal 63 is placedat the distance of the desired radius of cut above or below the axis of rotation of the head 22, depending on whether a concave or convex periphery. is to be cut on the wheel. The Vclamping'screwn53 is then retightened, but the thumbscrew 4| re-v mains loosened. Grasping one of the handlesv or. knobs 46, the operator swings or rotates thehead 22 through an arc centered kon the axis of rota# tion of the bore I9, causing the-dressingipoint or crystal 63 to swing in an -arcuate path and.r thereby cutting a surface of arcuate cross-section. on the edge of the grinding vwheel@ Instead ofA using the knobs 46, he may also swing the handle cap 9| and lever 84 to rotate the head 22 through the gearing 52, 83 and driving connection '|2, 13' (now locked in-engagement) In orderto govern. the length of Vswing of theldressing point .'63 in its arcuate path, the operator sets the stops'34v and 35 (Figure 4) so that thepin 33..will en 'v counter these stops at the desired opposite limits of swing or rotation of the head 22. f f

What I claim is:

l; A grinding wheel dresser comprising abaseL having substantially flat bottom and'rear. dresser-'- supporting surfaces arranged at right angleslctok one another, either of said supporting surfaces being selectively adapted to rest upon `a flat por`V tion of a grinding machine adjacent said grindv ing wheel, said base having a cavity thereinya rotary head rotatably mounted on-said base with its axis of rotation disposedparallel to one of saidsurfaces and perpendicular to thev other surface, a slide reciprocably mounted on` said head for' motion transversely to said axis of rot'al' tion of said head, a dressing tool holder mounted on said slide and having a dressing tool receptacle therein, and mechanism operatively connected to said slide and extending throughsaid base into said cavity for reciprocating said slide, said mechanism being 'disposed partlyv4 'within' said cavity and lying wholly inside theplane*-o` f j eachof said supporting 'surfaces,said 'mechanisinf in response to the rotation of said shaft, a locking arrangement responsive to the axial shifting of said shaft for locking and unlocking said slide relatively to said head, a manually-operated member operatively connected to said shaft to rotate the same, a shaft-shifting element mounted on said shaft, a movable cam operatively engaging said shaft-shifting element, and a cammoving member mounted on said manually-operated member.

7. A grinding wheel dresser comprising a base having a supporting portion adapted to rest upon a part of a grinding machine, a rotary head rotatably mounted in said base, a slide reciprocably mounted on said head for motion transversely to the axis of rotation thereof, a dressing tool holder mounted on said slide and adapted to receive a dressing tool, and mechanism operatively connected to said slide and extending through said base for reciprocating said slide, said mechanism lying wholly inside the level of said supporting portion, said mechanism including an axially shiftable rotary shaft extending through said base, gearing on said shaft connected to said slide for reciprocating said slide in response to the rotation of said shaft, a lock- REFERENCES CITED The following references are of. record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,443,899 Kusold Jan. 30, 1923 2,127,614 Parker Aug. 23, 1938 2,197,762 Johnson Apr. 23, 1940 2,302,712 O'Neill Nov. 24, 1942 2,336,758 Statia Dec. 14, 1943 2,476,322 Peters July 19, 1949 2,521,231 Larson Sept. 5, 1950

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