US2614552A - Grinding wheel dresser - Google Patents

Description

Oct. 21, 1952 c. M. GRIFFIN 2,614,552

GRINDING WHEEL DRESSER Filed April 9, 194a 2 SI-IEETS-Si-EET 1 Ceil M. Griffin C. M. GRIFFIN GRINDING WHEEL DRESSER Oct. 21, 1952 2. SHEETS-SHEET 2 Filed April 9, 1948 Cecil MG'r iffz'n Patented Oct. 21, 1952 UNITED S EN I 14 ciai'm (014125-11),

smoothly and accurately dress butler-radii angles; including: 1808 concave radii; and'zthat also LincornorateS1a. means as easily: accomplishe 'ing the; important feat :oIL: dressing'vavradiusz and? two-"tangents' to the't sameiat- OIIGjZTGOHfiIlllDUSL-GII-F erati'on; Moreover my? invention; "providesrras dresser; whichamay 'iieused imeither .ra r horizontal? or: up endedt Vertical: ipo'sitiorr, so ":as: 'tflifidDt it -to'fi use: om different types'zof grinding-1 mi difierenttdressing? operationszf According: toi the? present: inventiomaxthei diaa-i mondizisaiinterposedi near the as com? parativeli long-,2 .oarryiiiglrfran're having its: porting l biearmgs; at: its: extremities: With:

arrangement a: .fbetween': centers? effect is? ate; 30.

tainedi whicl'rsenhancexsmooth:"operationm -:F,lilli';ethermora, theisidewiserangles dressing.mtivenztent: is: efiiected by swingingt one'z'endizlofgthe carrying; frame about. t'hee bear-mgr". atrithe'alother "efidraS? a-:

pivot thus .im the: anglesr.'cuttinggonerationi tom: 35

the diamond interposed:befweenmidely 'spacedi bearings; resulting in :"smooth, accurate dress, ing; and, furthermore, myeinventidnrobviatesathe:- need for close-fitted, dove-tailed or ball hearing; slides; w-hioh;are diificult to;1maintain-,;-.panticular- 1y inithe ipresenceofi theagrihi'ncident toi grind-ingg operationsz My inventionimay bezmoreifzuiiy understoodihyr referencelfito; the: accompanying: drawings; :in:' which: 3'

;.'1 ;1s:..a7.1fiUp;ip1aIl3 vim: of: ee'toolz emb delvin Fig; z isl a1 sideielevationiloirthe tour snown inv- Fig: 1;:withxpa1itszthereof showniin'seotiom': Fig. 3 is an en'divietwof theftookshowii in:lig; :l-:,-' Fig; 4' is" a. transversevertioalsection: in substanti'ally 'thB D'IaIIBiOf lineiIv- -Ivtof Fig; 2;; r

Fig-L5 is a-side elevation; also partlycin section*,., of one end' of' the device} but viewedi from the?" Fig-62 is; a detail vije, of. one? mounting: for thin dressing point this: n'iounting:"being: particularly" designed for use in dressing concavedsurfabes oit eXtremelysmalLradii; 3

Fig, 7 is: a. side; elevatiomof anothenmountin'g: for therdressingq-toolg and-x:

Fig; 8 isia .top plan view of the Fig. 7;.

Referringto. the? drawings; the: dresser coinprises asupporting; base frame; 2.; havingziasfizfi bottom surface so: that it :can; be; conveniently? set; on; the: table of' ai grinding machine. ltz -hasi upward: extending; supportaportions's :3 andi. 41 :at: the ends-thereof: constituting. iheadsstocki am taiL-stoclr portions; respectively-:5 rigidly xoarriedz on: the support; 3 is .a fixedrdiallfi hayingeaiegene erallyz semi-circular periphery; Thefdi'al is grain machines: s

duated; in degrees having; 0 at"; thetop-centemandi extendihgthrough arrange of. 903i degrees in each..- direction; as. best shown in- Figure 3;. Passing: through the: support b is; asleeve: or spindle: 6;; Rigidly attached tothe innerendLofi'thiS sleeve. igaucro's'si rail 1; The cross rail-T 'l-zisi-prorided at; each; end with: an upwardly-sextending:,aFrnr: 8:; eaclr :ar'mvloeingfirloent forwardly; at 8a: ,oveliz thei periphery: oi the? dial 5:, The two-gforwardiw bent. portionsrzflw are oonnectedarby-ia enoss's ha ls 9i; -This':.crossj.bar' hasra.:dependingr-fingenawgiatj the:center"v thereofi which; is rigidlyyattachefii theretoz; Attached tome-"depending; fin ercis an? indicator II which moves inza. QIOQVG WZSQI -G HP? trio: with the graduations."onrthewfaee-aofiw the dial The 'indi'cators ll may; itselfrbevgrafli ai ed; sor-"as'sto :provide a; Vernier for accuratelyzide cne' mining:fractional degrees of 'rotat-ion Because of; thersleeve :bein'g rotatable in? the:- support fiy;

theicrosstrail 1-,- ;Which":is horizontaL-whenitheiro barproviding atconyenientthandlefon-smmanipu whiolrz'overhangs the: rail; l1; and; throu'gmnthe giiders'silifim;isfslidablyrsupportedihyi raikilm r The plate I6 is at the top of one arm I1 of a cradle-like carrier frame having a horizontal connecting bar I8 and another upwardly-extending arm I9. The arm I9 has a forwardlyprotruding stud element 20 near its upper end terminating in a hemispherical bearing portion which is seated in the socket element 2| on the upright 4 of the base 2, providing a universal pivotal bearing for that end of the carrier frame. A leaf spring finger22 secured to the upright 4 has its freeend interposed in a groove in the stud member 20 to keep the hemispherical bearing seated in the socket 2|.

By reason of the arrangement just described, rotation of the dial I3 turns the pinion I4 and transmits motion to the rack I5 to move the right-hand end of the underslung frame as viewed in Fig. 2, back and forth transversely of the shaft I2, the gliders lfiasliding along the top surface of the rail 1. Thus one end of the frame may be swung back and forth about the bearing -2I as a pivot point and transversely to the axis of rotation of the shaft'l 2. The upright arm I! of the underslung pivoting frame is provided with an extension 23that supports a leaf spring 24 having a roller 25 thereon which bears against theunder side of the rail 1 to keep the gliders lIia in contact with the upper face of the rail.

The cross rail 1 has a fixed keeper 26 secured thereto, and a rod 21 is slidable back and forth in this keeper. The rod 2! as viewed in Fig. 4,

together with the rectangular block 28 and the postv 29are rigidly assembled as one piece. The

post 29 is in a position to stop against the pin or abutment 30 in the cross rail 1, and, also, to contact the plate I 5, through the adjusting screw 29a. A tension spring 3| has one end secured to the top of the post 29, and has its other end se cured to a stud 32 at that edge of the plate It which is most remote from the post 29. Spring 3| thus exerts a tension tending to pull the plate I5 toward the left as viewed in Fig. 4, or toward the top as viewed in Fig. 1, to normally hold its edge in contact with the adjusting screw29a. When' the dial I3 is rotated in a direction tending to move the plate I6 toward the right as viewed in.

Fig. 4, the spring 3| is put under added tension because the point 32moves away from the post 29. Consequently, when the knob I3 is released, the spring 3| will act to pull the plate I6 back against the screw 29a.

A second tension spring 34 extending under the plate I5, also has one end secured to the post 29. The other end of this spring 34 is anchored to a stud 36 on the rail 1; The spring v34 thus operates sothat if the dial I3 is turned in the opposite direction, i. e., in a direction to move the plate IB to the leftas viewed in Fig. l, the spring vertically adjustable cross bar 40 mounted in the pivoted underslung frame. This bar has hand screws 4| at each end for operating clamping blocks 42 (see Fig. 1) by means of which the ends 34 will act to restore it to the center position.

The spring 34' cannot pull the plate IS in the opposite direction past the-center position because of the post 29 contacting the stop 30.

Springs 3| and 34, therefore, operate to nor-' mally keep the swinging frame centered.

Adjusting screw 29a is provided as a means of compensating for wear of post 29 against stop pin 30, so the diamond hereinafter described mayis to be the same as the measured setting of the diamond above or'below the axis of rotation.

Thediamond dressing point 44, supported inv the manner hereinafterdescribed, is carried by a of the bar are clamped to the ends of the frame to secure it in position.

Adjustment of the diamond toward or from the pivotal axis of the carrier, for large or small radii, is accomplished by moving the cross bar 40, which may bemoved upward or downward along the uprights I1 and I9 (see Fig. 2) of the underslung rotating frame when the clamps 42 have been slackened by loosening the hand screws curate positioning of bar 40. These jack screws are threaded throughlpins 43, which are inter changeable in the vertical series of holes in the uprights I! and I9. When the desired adjustment of the bar 40 moves it beyond the range of V the jack screws, pins43 are placed in higher or, lower holes, as the case requires.

The dressing point itself isdesignated 44, and in the form of the invention shown in Figs. 1 to 6, it is set in a supporting bar 45, the ends of which are secured-to the arms of a U-shaped yoke 46, the yoke 45 being rigidly secured to bar 40 by screws 41.

The bar 45, in which the diamond is set (see Figs. 1, 2 and 6) is of decreasing diameter from its ends towardthe diamond. This reduceddiameter is necessary only in dressing small concave radii, particularly when the angle turned is large, as in dressing small 180 concave radii. For dressing larger concave radii and all convex radii, a diamond supporting bar of uniform. cross section throughout may be used. Also the bar 51 (see Figs. 7 and '8) in which the diamond 55 is set in the top of a'post 56 may be used. It will be seen that the post56 is tilted (10 to 15) from the perpendicular, and also, that by loosening the clamping. screw 58 the post56 may be rotated. This tilted position, together with the rotatability, permits presentation. of a new cutting edge when the diamond becomes dull, thus prolonging the effective life of the diamond. The bar 51 is interchangeable with the bar 45 shown in Fig. 6. A slit milled in the bar 51 (see Fig. 8) permits loosening the post 56 when screw v58 is unscrewed, making it easy to adjust or remove the post.

The ends of the bar 51, like the ends of the bar 45, are cut away to the center line of the bar, as indicated at 51a, so that the plane of the faces 51a contains the diamond point. This is done as a means of accomplishing interchangeability.

To facilitate the operation in dressing angles and'tangents to radii, stops are'provided comprising the rectangular base pieces the clamping screws 5| with wrenching handles 52, and the posts 53 which protrude from the base pieces 50,

to engage the dependent finger II).

To set a stop the indicator I I is brought to the desired angular position on dial 5 and held there by using the bar 9 as a rotating handle or crank,

then the part is rotated about the'clamping t screw 5| until the post 53 is brought against the fliiger ifl. lheiclamping screwxli's ithen tightened flrmly 'by turning 'it with-the lever 52 iIhe lzpost the radius dressing operation at 54", as it would beset to:-d-ress :an angle of 34 or to: dress:a .ta'ngen fito a r-adius atanangle of 54 T0 dress -two -angles or two atangents, or an angle Lincline'd antiecloclewise to the horizontal, the othertleft 'hand) stop is-set; using the same procedure as is outlined for:setting the clockwise stop.

From the foregoingii; w'illibe seen that in additionto relatively simplegand rugged eonstruction, "my "invention provides a dresser ihaving important inherent "features which-enhance its useability, which are: I

(1) The" -diamond point -sets'- in the side ef E its supporting bar 45 which is, in turn, rigidly-"supported at both ends, and'is arranged in-a tangent position to the grinding -wh'eel, which permits dressing deep concaveradii (up t0"l-80-) without requiring a special attachment. Il i s construction "also provides a maximum ofrigidity and accuracy of alignment for the "diamond point which i i's-particularly important I in dressing very small :con'cave radii.

' (2-) Dials are positioned where *they" are out derstood that thisis by=waypfillustration,and

that-various-changes "and -modiiications may be made in the construction and "arrangement of parts within the contemplation of *my invention,

and under thegscope ofthefollowing claims.

I claim:

l. A radius ,and angle dresser for grinding wheels comprising a base with upright headstock and tail-stock portions at'itsends containing bearing systems, said bearing systems having a .commonaxis for rotation,zsaid headstock bearing system supporting a rotatable spindleinrigidalignment, aportion of thespindle projecting fromthe inner faceofthe head-stock, araiI-rigidIy attached crosswise of said spindle projection and rotatable with the spindle, a rotatable carrierframe extending'between the rail and the answer, a cutting -nib adjustably mounted: on the carrier frame intermediate the ends thereof, meansconnecting the carrier, frame to the rail providing for coincidental rotation of the frame and the rail and also for sidewise movement of the end of the carrier frame along the rail to effect angular displacement of the carrier frame about its pivot axis in the tailstock bearing system, said tail-stock bearing system functioning to provide support for the carrier frame in both rotational and angular displacement, a graduated scale on the headstock, handle means attached to said rail for rotating the rail and carrier and having an indicator thereonrterniinatingradjaceritaaidisoale,zmimoi:

'outsideiof the headstock' and connected'iwithfzthe carrier, and rmeans actuated :by :tthe :knob 'ifOl effecting angular-:movement of thacarriert frame.

2; radius and :angle dresser "for grinding wheels as I-descri-bed-l in claim 1 1, whereintthe .-:cutting 'n'ib is set in'thesid'e of a rod, the rod:b'eing supported at its ends, 1 that portion :of the rod between ''the --supp'or-ts being i in clear suspension, the r cutting nib being i set in the suspended :por tion "of the red, the i longitudinal axis'o'f the rod being parallel" to the eaxis of *rotation on the carrier frame.

"3. A radius "and angle dresser asdefined-- in claim "2, wherein the suspended portion of the rod, in whi'ch the cutting nib is setfiis of tie-- creased 1 diameter to permit? dres-sing smallfideep, concave radii.

4. A radius --and angle dresser as 1 defined claim Wherein the bottom *and -the man-steel; end of the-base are flattenedsothe dresser will stand'securely on a flat surface in-either a horizontal'ora vertical position.

5. A radius and angle "dressera's defined in claim *4, a centering stop on "said carrier *frame supporting means, springmeans resistingmovemerit, of the carrier frame along the rail from, and automatically returning it to, said'c'entering stop, and adjusting means-on said stop-:to-adj-ust the centered position of the'carrieryframe thereby to "accurately align "the cutting nib in the plane-perpendicular to its-plane of sidewise movement and containing theaxis of rotation.

6. A radius and angle dresser 'for'grinding wheels comprising -a basewith upright headstock and tail-stock1 portionsat its ends containing bearing systems, said bearingsystems having a common "axis for "rotation, "said head-stock bearing-system supportingarotatable spindle' in rigidalignment, a portion of-the spindle projecting'from theinner faceof the head-stock, a rail rigidly attached crosswise of said spindle projection and rotatable with the spindle, 'a "ro-' tatable carrier frame extending between the rail and the tail-stock, a cutting nib adjustably mounted intermediate-the ends of 'the carrier frame, means connecting the carrier frame to the rail providing for coincidental rotation of the frame and the 'railand also for sidewise movement ofthe end of the carrier-frame-along the'rail to effect angular-displacement of the carrier frame about its pivot axisr'in the'tail-stock bearing system, :said "tail-r stock hearing system functioning to provide support for the carrier frame in both "rotational and angular displacemerit, :a graduated scale on the .head=stock, handle -means attached to the rail "for rotating the rail "and the carrier having tan indicator thereon terminating adjacent said scale,.a knob outside of the head-stock, cooperating means actuatedby the knob and connected with 'the'ca-rrier for effecting angular movement of the carrier, and adjustable 'stops'on the'head-"stockin said spindle projection and rotatable with the spindle, a rotatable carrier frame extending be-' tween the rail and the tail-stock, a cutting nib adjustably mounted intermediate the ends of the carrier frame, means connecting the carrier frame to the rail providing for coincidental rotation of the frame and the rail and also for sidewise movement of the end of the carrier frame along the rail to effect angular displacement of the carrier frame about its pivot axis in the tail-stock bearing system, said tail-stock bearing system functioning to provide support for the carrier frame in both rotational and angular displacement, a graduated scale on the head-stock, handle means on the rail for rotating the rail and the carrier having an indicator thereon terminating adjacent said scale, a knob outside of the head-stock, cooperating means actuated by the knob and connected with the carrier for effecting angular movement of the carrier, adjustable stops on the head-stock in the path of movement of said handle for limiting the rotational movement of the carrier in either direction, the carrier frame being underslung, comprising a bar portion having an arm at each end thereof, a cross bar adjustably supported on said arms for movement radially to the axis about which the carrier frame rotates, and a cutting nib mounted on said bar.

8. A radius and angle dresser as defined in U bearing system for lending pivotal support, said bearing systems being aligned to have a common pivotal axis, a spindle rotatably supported in the head-stock bearing system, a rail fixed to and rotatable with the spindle and extending crosswise said pivotal axis adjacent the inner face of the head-stock, a cradle-like carrier comprisinga bar with upturned ends extending between and supported by the rail and the tail-stock bearing system, means connecting the carrier to the rail for holding them together for rotation as one and permitting sidewise movement of the end of the carrier along the rail to effect angular displacement of the carrier about a pivot axis in the tail-stock hearing system, said tail-stock bearing system functioning universally to provide support for the carrier in both rotational and angular displacement, a cutting nib mounted on the carrier intermediate the ends thereof, a graduated dial attached to the head-stock, a pointer connected by rigid interconnecting means to the rail and arranged to move along the dial graduations when the carrier is rotated to indicate the degree of rotation of the cutting nib, means operatively connected to the carrier for producing the side-to-side movement of the end of the carrier along the rail, an abutment pin on the rail, means acting in conjunction with the abutment pin to yieldably resist the side-to-side movement for arresting and holding the carrier at central position when side-to-side actuating forces are relinquished during radius shaping operations.

10. A radius and angle shaping device as defined in claim 9 wherein the cutting nib is mounted on a bar'which extends between and is adjustably supported at its ends for up and down adjustment on the upturned ends of the cradle-like carrier, whereby adjustment of the cutting nib toward and from the axis of rotation of the carrier is effected.

11. A radius and angle shaping device as defined in claim 10 wherein the cutting nib is set in the side of a relatively slender rod which is connected at its ends only to the adjustably supported bar and held in spaced relation above the bar.

12. A radius and angle shaping device as defined in claim 9 wherein the means for centering and holding the carrier at central position comprises two tension springs and a movable member with one end of both attached to the movable member and both springs exerting force on said movable member in substantially the same direction, the other ends of the two springs being attached one to the rail and the other to the carrier the movable member stopping against the abutment pin when the carrier is at central position.

13. A radius and angle shaping device as defined in claim 9 wherein said rigid interconnecting means between the rail and the pointer comprises arms which extend from the rail over the periphery of the dial where they are connected with a member which extends across the face of the dial and lends support for the pointer and wherein said arms and connected member are so arranged to serve as a manipulable handle for rotation of the carrier.

14. A radius and angle dresser as defined in claim 13 wherein there are adjustable stops arranged to arrest the rotational movement at any predetermined degree of rotation, there being one stop to arrest the clockwise rotation and another to arrest the counterclockwise rotation.

CECIL M. GRIFFIN.

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

UNITED STATES PATENTS Number Name Date 1,448,239 Schuessler Mar. 13, 1923 2,028,42e Dillen Jan. 21, 1936 2,294,008 Turrettini Aug. 25, 1942 2,360,013 Renner Oct. 10, 1944 FOREIGN PATENTS Number Country Date 501,021 Great Britain Feb. 20, 1939

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