US2439263A - Grinding wheel dresser - Google Patents

Description

April e, `19.415.

E. A.'OVERSTEDT GRINDING WHEEL nRssER' Filed Aug. 9. 1944" 4 sheets-sheet 1 April 6, 1948.

E. A. ovERsTEDT 2,439,263 GRINDING WHEEL DRESSER l Filed Aug. 9v, 1944 Ap 76, A194s.

E. A. ovaRs'l-EDT GRINDING WHEEL DRESSER Filed Aug. 9, 1944 4 sheets-'sheet s IN VEN TOR.

Patented Apr. 6, 1948 GRNDING WHEEL DRESSER Ernest A. Overstedt, Detroit, Mich., assigner to Louella May Dalzen, William Russel Dalzen, and Frederick Roy Dalzen, trustees. Dalzen Y Trust, Detroit, Mich.

Application August 9, 1944, Serial No. 548,701

12 Claims. l

This invention relates to dressers for grinding wheels and more particularly to a thread grinding wheel dresser. The present invention provides a dresser for the two flanks of a grinding wheel as well as the top peripheral edge thereof.

It is the object of the present invention to provide a dressing mechanism employing a plurality of dressing diamonds adapted to dress the grinding wheel flanks from 15 to 90 included angle. and the top edge of the Wheel from a flat to an angle of approximately for a sloping root of thread. y

It is the further object herein to provide a plurality -of separately supported pivotally mounted dressing diamonds each adapted to progressively sweep one of the grinding wheel edges rst in one direction and then the other.

It is the further object of this invention to provide means for slidably supporting the dresser housing with respect to the Vgrinding wheel together with means for effecting intermittent regular adjustments of the dresser relative to said wheel.

Further objects will be seen in the various arrangements of elem-ents and their combinations forming a part of said dresser as set out in the following specication and claims in connection with the appended drawings of which- Fig. 1 is a front elevational view of the Wheel dresser. l

Figl. 2 is an elevational section of line 2- 2.of Fig.

Fig. 3 is a right end elevational view thereof.

Fig. 4 is a plan view thereof.

Fig. 5 is an elevational section on line 5 5 oi Fig. 2.

Fig. 6 is an elevational section on line Fig. 4.

It will be understood mthat the.` above iigures are merely illustrations of a preferable embodiment of the invention, and other `embodiments are contemplated within the scope of the inven` tion as set out in the accompanying claims.

In the drawings, the grinding wheel dresser consists of housing II with removable front plate I2 as shown in Fig. 1. `In Fig. 4 parallel 'spaced ball tracks I3` are shown joined to housing Il, and adaptedV for vertical adjustments relative to s-s cf corresponding spaced' adjustable tracks I4 formpensate for 2 ing a part of vertical slide I5, with spacer carried balls IB interposed between said tracks.

Vertical slide screw Il shown in Fig. 6 supported by housing II with bushing I8 interposed, threadably engagesv nut 34 secured within vertical slide I5 whereby rotation` of screw I1 effects vertical adjustments of housing II relative to said vertical slide. t

Said slide is further adjustably carried by supporting bracket I9 by means of manually adjustable screw 20 rotatably carried by said bracket and threadably engaging vertical slide I5.

The latter slidably engages said bracket by the dovetail connection 2|` with vertical slide gib 22 interposed and with gib adjusting screw 23 for taking up any slack therebetween, as shown in Fig. 4.

Bracket I9 which thus adjustablly carries dresser housing II, though broken away in Fig. 4, is adapted for attachment to the grinding wheel supporting head not shown, of for instance, a thread grinding machine.

'I'hus while said bracket moves together with 4feed. movements of the grinding wheel yet vertical adjustments of the dresser housing are provided relatively toA said grinding wheel to comchanges in wheel diameter due to wear and to dressing of the peripheral edges thereof.

Dresser housing feeding Housing II is adapted to manual feeding relative to the grinding wheel by means of ratchet wheel shaft 24 rotatively mounted upon housing Il within bushings 25 therein. Hand wheel 26 on one end of said shaft permits manual rotation thereof as well `as of bevel gear 21 at its other end which is inmesh with `corresponding bevel gear 28 secured upon vertical slide screw I'I. Thus actuation of said hand wheel effects vertical adjustments oi dresser housing I I with respect'to vertical slide I5, as well as with respect to grinding wheel 29. A

Housing II is also adapted to accurate feed adjustments by means of `electrically actuatedV solenoid 30 best shown in Figs. 3 and 4. Link 3l inter-connects said solenoid and feed ratchet lever 32 by pins 33; while said lever is pivotally mounted upon ratchet wheel collar `34 `forming a part of ratchet wheel 35.

The latter keyed at 36 to shaft 24 is intermittently actuated by pawl 31 in Fig. 3 pivotally carried by stud 38 extending from adjacent the end of lever 32 as shown Vin Fig. 1. Fig. 3 shows compression spring 39 joined to the end of pawl 31 and with its other end secured to the end of lever 32 for resiliently maintaining pawl 31 in engagement with ratchet wheel 35.

A second coil spring 40 is secured at one end at 4| to lever 32 while the other end is anchored at 4Z to dresser housing whereby said lever is resilientl-y tilted counter-clockwise.. .Ont actuation of solenoid '36 by a suitable hand switch, link 3| is projected downwardly effecting a clockwise pivotal movement of lever 32 and a corresponding translatory movement of pawl 31 to the right resulting in rotary movement of ratchet 35 and shaft 24. I Y

Thus by actuation of so1enoi'd'3-6' accurate and' regular adjustments of the dresserghousing may be effected relative to grinding wheel 26. Adjust able stop d3 shown in Figs. 1 and 3 adjustably supported by stud 44 on housing is adapted'to act as a stop for ratchet lever 32 limiting the resilient return movement counterclockwise thereof. When set as showni-.n Fig. 1 surface 45 is engaged by said. lever permitting .only enough return of pawl 31 so that only one ratchet tooth is passed thereby.` Consequently actuation of solenoid 36 will result in a one-thousandth of an inch feed of dresser housingvl With stop i3 adjusted angularly clockwise itis seen that lever 32 can return for engagement with stop surface 46 permitting4 pawl 31 to pass 'over two teeth'fof ratchet wheel 35 so that upon the next actuation of said DaWl the dresser housing feed will be two-thousandths of an inch.

Stop plunger 4&1 inFig. 3 is resilientl'y urged by adjustable spring 48 into cooperative engagement with stop 43 within-eitherop'e'ning d6 or'ilv Fig.

Y l for maintaining said stop in either of the two adjustments referred to.

Dresser feeding as above described may be thus effectedfor either successive one-thousandth of an inch feed or successive two-thousandths of an inch feed upon each actuation of solenoid 36 accompanied by downward movement -oflink 3|.

t is understood, however, that other adjustments are Apossible merely by changing stp"4`3 and its surfaces. The important featureV herein resides in the fact that the returnsweepofpawl 31 over ratchet wheel 35 is effectivelyregulated so. that one or twote'eth 'are encompassed by said pawlwhen actuated by lever 32. l

Diamond dressing' mechanism For actuating the dressing mechanisme. constant speed electric motor is. employed secured Within dresser housing if as. shown in'Figs. 1, 3 and 4. This motor is preferably agear reduction motor with an output of two to four revolutions per minute. It is contemplated, however, that any other type of motor would also be suitable. Rotatable output shaft 52, Fig. I, has a crank 53y thereon carrying an oi centersleeve 5d, Fig. 3, upon which the upper end. of connecting rod 55 is pivotally secured. y

Sleeve 56 secured to pivotal'oper'atingarm 51 is pivotally joined to the lower end of connecting rod 55. Thus asngleirotation ofV cran-k 53 on motor 5| elects a reciprocable arcuate movement of operating arm 51. Arcuately reciprocabl-e arm 51 is joined to the diamondarm/s driving'disc 58 by key 59 as shown in Fig. 2.- with spring 60 interposed therebetween. j a Y Shaft 6| secured to cover plate I2 by threaded.

nut 62, extends through said plate providing a support for driving disc 58 upon which it is reciprocably and arcuately journaled. Collar IE3 provisioned on the end of arm 51 threadably engages shaft 6| and is secured thereby by set screw 64. Thus reciprocable arcuate movements are imparted to diamond arms driving disc 56.

Referring to Fig. 2 bracket 65 for the top diamond arm is carried upon the inner dovetail surface 65 of cover plate |2 which is arcuate in form Fig. 5 lto correspond with. arcuate adjustment slot 61', Fig. '1, forme-d therein. Arcuate clamp 38 interposed between cover plate I2 and bracket 65 is employed together with clamp screw 69 for securing said bracket either in a vertical position or in'an. adjusted angular position relative to plate l2.

Setting plug' 1U secured to bracket 65 extends outwardly through arcuate slot 61 providing means Afor accurately indicating the arcuate posip tion of said bracket.`

Hollow bracket with cover plate 1| has secured-therein bushing 12 through which is rotatably journaled diamond arm carrying shaft 13. Plate 14| supports shaft 13 with connecting screw l5, there being a coiled spring interposed between said bracket and shaft supporting plate. 14.

Top diamond carrying'` arm 16 issecured upon the lower end. of rotatable shaftl1'3 with washer il interposed between said arm andv bushing 12. Head 18 O'n the end O'f af'ni T6 has a transverse opening for adjustablyv retaining diamond' holder i9 secured thereinby set-screw 8U. there being a suitable diamond edge 8|' upon tl'ieLlower end .of said holder. V Y

The opposite end of arm T6 is bifurcated at 8.2 (only one of said bifurcations appearingfinthe section, in Fig.y 2) for receiving spherical ball member 33 upony the inner end of drive pin 8'4. The latter projects through a corresponding opening in reciprocable operatingl disc 58'- and` is secured thereto by nut 85. 1 Y Y By means of ball 83 a Yuniversal connection is effected between reciprocable operating disc 58 and the top: diamond arm 16, whereby an arcuate reciprocable movement of operating disc 5a effects a corresponding arcuate reciprocable movement of the top diamond arm 16 and its supporting pivotal shaft 13'. In turn an Varcuate reciprocable sweeping movement of diamond 8| is effected with respect to the top edge of the grinding` wheel sought toV beV dressed, as for instance, grinding wheel 2.9in Fig. 5.

As above explained bracket 55' is angularly ad- J'ustable, ychanging theE angle of sweep of. diamond 8|. However such adjustment in no way affects the arcuate movement of diamond-arm 'i6 because of the universal: ball connection between said diamond arm, and the driving disc 53.

As' shown in Fig. 5' a separately supported right hand diamond arm 86 is shown pivotally supported from bracket 61 by a suitable shaft carried thereby in the manner described in detailpw'ith respect to bracket 65 in Figi 2,

Correspondingclamp screws G9 permit-arcuate angular .adjustmentsof bracketS-l with respect to arcuate dovetail slide 66 formed upon nthe back of cover plate f2. i Similarly a setting plug' 68 is secured to bracket' 8T and projects outwardly through ccrresponding arcuate acl-j ustment opening sem @over plate far'ig. 1.

Right diamond amil se with head 9c at one me afjllstbly Supports? diam-ond holder 9| Vwith its diamond end 92 wliielris adapted Vto reciprocabl'e casacca sweeping movement relative to one of the inclined edges oi grinding Wheel 29. It is understood that regardless of the angular adjustment of bracket 81 the sweeping movement of diamond 92 is always in a plane perpendicular to the central axis of said bracket.

As above described in detail, the inner end of diamond arm 86 is likewise bifurcated for receiving ball member 93 on the inner end of drive pin 94, shown in Fig. 1, but which is similar to drive pin 84 shown in Fig. 2.

Drive pin 94 projects through a corresponding opening in cover plate l2, Fig. 1, and is secured to reciprocable driving disc 58 by nut 95. Similarly, by the universal connection between reciprocable driving disc 58 and right diamond arm 86 it is seen regardless of the angular adjustment of bracket 81, that arcuate reciprocable movement of driving disc 58 effects a corresponding planular arcuate reciprocable movement of rightvdiamond arm 85 as well as diamond 92 carried thereby.

Fig. 5 also shows a corresponding separately supported left hand diamond arm 93' pivotally supported by bracket 94 by a suitable shaft carried thereby as above described.

Corresponding clamp lscrews 69 permit arcuate angular adjustments of bracket 94 with respect to arcuate dovetail slide 66 formed upon the back of cover plate |2. Similarly setting plug 95, Fig. l, is secured to bracket 94 and projects outwardly through corresponding arcuate adjustment opening 95 in cover plate l2.

Left diamond arm 93 with head 91 at one end adjustably supports diamond holder 98 with its diamond end 99 which is adapted to reciprocable planular sweeping movement relative to the other inclined edge of grinding wheel 29.

The inner end of diamond arm 93' is likewise bifurcated for receiving ball member |00 on the inner end of drive pin |0|, shown in Fig. l, but which is similar to drive pin 84 shown in Fig. 2. Drive pin |0| projects through a corresponding opening in cover plate I2 and is secured to reciprocable driving disc 58 by nut |02.

Similarly by the universal connection between driving disc 58 and left diamond arm 93' it is seen, regardless of the angular adjustment of bracket 94, that arcuate reciprocabl-e movement of driving disc 58 eiects a corresponding planular arcuate reciprocable movement of left diamond arm 93 as well as diamond 99 carried thereby.

From the above it is seen that arcuately reciprocable diamond arm driving disc 58 has adjustably secured thereto the three diamond arm drive pins 84, 94, and 0| respectively secured by nuts 85, 95 and |02.

All of these pins project inwardly through the semi-circular opening |03 in cover plate |2 terminating respectively in the three spherical memberr 83, 93 and |00 shown in dotted lines in Fig. 5.

Each of said members respectively joins the three diamond carrying pivotal arms 16, 86 and 93 being inserted within the corresponding bifurcations in their ends.

Thus the arcuate reciprocable movement of driving disc 58 is adapted to effect corresponding reciprocable movements of each of the diamond carrying arms. By virtue of the separate universal driving connections between said disc and each of said arms it is seen that the arcuate reciprocable movement of said disc effects separate planular reciprocal sweeping movements of each of said diamond carrying arms with respect to one of the edges of grinding wheel 29.

\ It will be noted as each of said arms is pivotally supported from the adjustable brackets 65, 81 and 94 by the Apivotal shafts therein, that the `movements of said arms regardless of the angular adjustment of their supports is limitedto reciprocable planular movements perpendicular to the axes of said brackets.

Consequently sweeping reciprocable planular movementsofeach of said diamonds 8|l, 92 and 99 are effected relative to the three peripheral surfaces of grinding wheel 29.

Because of the rocking movement or driving disc 58 it is seen that diamond y92 engages the wheel at its lowest peripheral point sweeping up and diamond 8| engages the left top edge of the wheel 29, viewing Fig. 5, sweeping to the right. At the same time diamond 99 engages the wheel at its topV edge-and sweeps angularly downward. On thereturn arcuate movement of disc 58, the reverse is truewith each of said diamonds 99, 8| and 92 simultaneously sweeping over the surfaces of thegrinding Wheel corresponding thereto.

Referring to Figs. 1, 3 and 4, a limit switch case |04 is shown secured at |05 upon the front of motor 5| above crank 53 rotated thereby. Limit'switch |06 provisioned withincase |04, as shown in Fig.\3, has acentral actuating means |01 for said switch which depends downwardly through bottom cover plate |08. Said switch controls by suitable wiring, not shown, stopping of motor 5| governing the dressing operation. In the lowestposition of actuating means lill, and when released to Vassume that position, switch |06 permitsA operation of said motor. However with means] 01" elevated the switch stops the motor. Crank 53 has a central projecting switch actuating means |09 adapted to operably engage switch actuating means 01 each time said crank completes a revolution. Thus on one revolution of crank 53 one reciprocable sweeping movement ofthe dressing diamonds is effected and the motoris then stopped as crank means |89 engages switch actuating means |01 projecting the same upwardly.

Itis understood that motor 5I can be again restarted for another dressing operation by a suitable switch independent of limit switch |06. Naturally restarting of motor 5| effects a release of switch actuating means |01. Consequently it is seen that the sole purpose of limit switch |96 is to stop motor 5| at the end of one revolution thereof.

Again referring to Fig. 1 stationary setting plugs ||0 are shown projecting outwardly from cover plate |2. These plugs provide accurate measuring points for obtaining accurate adjustments ofany or allv of diamond arm bracket adjustment plugs 95, 10 andV 88.

Having described my invention reference should now be had to the claims which follow for determining the scope thereof.

I claim: t

V1. Agrinding wheel dresser comprising a heusn ing, a plurality of separately mounted diamond supporting means pivoted thereon, each adapted to sweeping dressing movementsrelative to one of the peripheral edges of said grinding wheel, a reciprocable disc on said housing universally joined to each of said supporting means for effecting alternate clockwise pivotal movements thereof and reversed alternate counter-clockwise pivotal movements thereof, and reciprocal means pivotally joined to said disc.

2; A grinding wheel dresser comprising a housing, a plurality of separately mounted angularly adjustable diamond supporting means pivoted casacca thereon, each. adapted to sweeping dressing movements'V relative toene oi the peripheral edges of said grinding wheel, areciprocable disc on. said housing universally joined` `to each o said supporting means for effecting reciprocable pivotal movements thereof, and reciprocal means pivotally joinedy to said disc, whereby slight substantially instantaneous reciprocalmovements thereof effect a complete reciprocal dressing operation.

3. A grinding wheel dressercomprising a housing, a plurality of. radially spaced` separately mounted brackets thereon,- diamond si-ipportingfv means pivotally carried by each bracket and adapted to sweeping dressing movements relative to one of the peripheral edges of said grinding wheel, reciprocable disc on said' housing. universally joined to each of said supporting means for eiecting reciprocable pivotal movements thereof, and reciprocal means pivotally joined to said disc and adapted on reciprocal movementthereof to effect a completereciprocaldressing operation.

4. A grinding wheel dresser comprising-a housing, a plurality of radially spaced separately mounted brackets thereon,.,a top diamond arm, a right hand diamond arm, and al left hand diamond arm pivotally carried by said brackets with dressing diamonds depending from the ends thereof for relative sweeping engagement with the peripheral edges of said-grinding wheel, a pivotal reciprocable drivingdisc on said housing universally j oined. separately to the opposite ends of each of said diamond arms for effecting reciprocable pivotalmovements thereof, and longitudinally reciprocal meanspivotally joined tosaid disc for effecting reciprocal movement thereof, and adaptedon. reciprocal. movement thereof to effect a complete reciprocal dressing operation.

5. A grinding wheel dresser comprising a housing, a plurality of angularly adjustable radi-ally spaced separately mounted brackets thereon, a top diamond armr a right hand diamond-arm, and a left hand diamond arm. pivotally carried by said brackets with dressing diamonds depending from the ends thereof` for relative sweeping engagement with the peripheral edges of said grinding wheel, a pivotal reciprocable dri-ving disc on said housing,- and. radially spaced transverse drive pins carried by said driving disc and universally joined to the opposite ends of each of said diamond arms for eiiecting reciprocable pivotal movements thereof.

6. A grinding wheel dresser comprising a housing, a plurality ofv angularly adjustable radially spaced separately mounted bracketsl thereon, a top diamond arm., a righ-t hand diamond. arm, and. a leftl hand diamond armA pivotaIl-.y carried by said brackets with-dressing diamonds depending from the ends thereof. for yrelative sweeping engagement vvithA the peripheral edges of. said grinding wheel, a pivotal reciprocable driving. disc on said housing, radially spaced transverse drive pins carried by said. driving. discand universally joined to the opposite ends. of eachof said-l diamond Aarms for effecting reciprooable Vpivotal movements thereof.V and adjustment setting plugs carried by said brackets andextending outwardly through saidv housing 7. A` grindingwheelldresser comprising. a housing, a removable cover plate thereon: having an arcuateA dovetail'y ange within Asaid housingF a plurality of radially spaced brackets adjustably carried upon said angea top diamond arm, a right hand diamond arm, and a lefthand diamond arm Ypivotally carried :by said brackets with dressing diamonds depending from' the `ends thereof for separate relative. sweeping engagementvvith the peripheral edges of said grinding wheel.. a reciprocable driving disc pivotally carried upon theoutside of said cover plater and radially spaced transverse drive pins. carried by said disc, projecting through said cover plate, and universally joined. to the opposite ends of each of said, diamond arms for effecting reciprocable pivotal movements thereof..

8. A grinding wheel dresser comprising a housing, a plurality of separately mounted diamond supporting means pivoted thereon, each adapted to sweeping dressing movements relative to one of the peripheral edges of said grindingV wheel, pivotallly reeiprocable means on saidhousing. and radically spaced drive means carried -by said reciprocalmeans and universally joined toeach of saidsupporting means for effecting reciprocable pivotal movements thereof, and an actuating reciprocable connecting rod joined to said reciprocable means, whereby slight substantially-instantaneous reciprocal movements of said pivotal means effect a complete reciprocal dressing operation.

9. A grinding wheel dresser comprising. a housing, a plurality of separately mounted diamond supporting means pivoted thereon, each. adapted to sweeping dressing movements relative to one of the peripheral edgesof said grinding wheel, reciprocalole means on said housing., and radially spaced drive means carried by said. reciprocal means and universally joined to each of said supporting means for effecting reciprocable pivotal movements thereof, an actuating reciprocable connecting rod pivotally join-ed; at once-nd to said reciprocable means, and a motor dri-veri crank-.eccentrically and pivotally joined to the other end' of said connecting rod.

l-O. A grinding Wheel dresser comprising a` housing, a plurality of separately mounted diamand supporting means pivoted thereon each adapted t-o sweeping dressing movements relative to one oi the peripheral edges of said grinding wheel, reciprocable means on said. housing, and radially spaced drive means carried'by said reciprocal means and universally joined tofeach of saidsupporting means for effecting reciproca.- ble pivotal movements thereof, an actuating reclprocable connecting rodrpivotally joined at one end toy said reciprocable means.. a motor driven crank eccentrically and pivotal-ly joined to the other end oi said connecting. rod, and a: motor switch actuated by said crank for limiting the sam-e to one revolution.

ll. A grinding wheel dresser comprising; a housing, a plurality of separately mounted; diamond supporting means pivoted thereon, each adapted. to sweeping dressing movements relative to oneot the peripheral edges of said; grinding. wheel; reci-procableymeans on. said housing, radi-y a-.lly spaced drive means carried by said.' reciprocable' means universally' joined to'each of sai-d supporting means for eifectingreciprocable pivotal movements thereof, anelectricrmo'tor on housing`, arotatable crank drivenY thereby, means interconnecting said' reciprocable Nmeans and' said crank', and amotor switch actuated by said crank forV limiting the' same to one revolution.

122 A. grinding Wheel ydresser comprising a housing., rotatable threaded means carried Yby said' housing for effecting-adjustments of said housing relative to said grinding wheel?, arctatable shaft operably *jo-ined to said threaded ERNEST A. OVERSTEDT.

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

UNITED STATES PATENTS Number Number Name Date Brown Sept. 14, 1920 De Leeuw Apr. 17, 1928 Flanders Mar. 1, 1932 Snarry Aug. 14, 1934 Stewart Feb. 16, 1943 Snader July 4, 1944 Schantz Apr. 16, 1946 FOREIGN PATENTS Country Date Germany July 116, 1913

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