US2554689A - Adjustable tool grinding machine - Google Patents

Description

May 29, 1951 w. w. WARFEL ,689

v ADJUSTABLE TOOL GRINDING MACHINE Filed Jan. 7, 1948 3 Sheets-Sheet 1 guuuul llllllllllll 1 INVENTOR l5 7 BYWILLIAM w. WARFEL ATTORNEY M y 2 1 51 w. w. WARFEL 2,554,689

ADJUSTABLE TOOL GRINDING l MCHINE I Filed Jan. 7, 1948 3 sheetswsheet 3 INVENTOR ILLIAM w. WARFEL Patented May 29, 1951 UNITED STATES PATENT OFF I C E ADJ USTABLE TOOL GRINDINGTMACHIN E William Warfel, Chicago, Ill.

Application .January 7, 1948, SeriaLNorS'Zfi 11 .Claims.

.This invention relates to adjustable devices .adapted for -.use inmounting, holding and-selectively moving and feeding :router :bits, drill bits and similar tools to a. grinding elementzto be ground .alongarcuate or non radial faces.

It is an important-object of .my invention to provide machines or adjustable gauges of the .described class which include novel pivotal means for gripping and selectively setting bits to be ground; gradually tapered cam means providing .forselectively rotating mounted bits during the grinding and sharpening operations thereof; adjustable means for pro-setting of. said rotatable cam meansso. that the-bit to be sharp- .ened willbe presented to .and movedwith respect to the grinding surface of an abrasive wheel at the, proper arc and angle so that the originalcorrect clearance without changing the face of the bit cuttingparts willbemaintained.

A further important. object of my invention is the provision in a device of the described class rotatably mounted ,ina pivotal frame; saidcam shaft having. adjustable Zbit .grippingandholding means connected thereto; and a manuallyadjustable pivoted-arm.whose free endportionzat one side normal-1y rests against .a. rigid. element and the oppositeside of said arm end portion slidably engages the non-roundsurface of "said cam shaft .to thereby cause theucamshaftframe to pivot .according .to the curvature of the. engaged face of saidcamshaft and to provide. for: non-concentrically-rotating a bit held-in said holding-means of said shaft.

It is well, known. that cutting and routingbits having arcuate surfaces haveto be frequently re-ground in order to. sharpen the cutting edges thereof. Grinding by.merely handgrippi-ngthe bits is unsatisfactory .as is-a1so rotating .such bits in a rotatable jig-.becausethis grinds .away the hit stock .unevenlyand changes and ruins the original .arcuate .surface nor lclearance with the ;resu1t.-that very-poor andunsatisfactory cutting .and short life-of bits'result. Especially with bits havingnon-concentric rounded faces to be ground it hasbeen extremely difficult and often impossible for even expert machinists to ,gr-ind away correctly the non-concentric portions of such bits to maintaina correct clearance for the material being .cut. This diflicult problem of correctly grinding non-concentric :surfaces either of bits orother .machineparts is entirely eliminated with my -.novel mechanism as willmore fully hereinafter appear.

.A .stillfurther [object and accomplishment of my invention .is the .provis'ion of a .manually adjustable tool gripping pre-shetting and clear ance-ad'justingmeans. having I an indicia-bearing disk thereon which provides for swinging said means against the flat face of the cutting end .of a .bit,-measuring the angle -of the flat face thereof with -respect to the frake and thence mounting the .bit into the holding means at a different --angle to ,the grinding wheel so that it .may be accurately .groundto change the original clearance to the desired degree.

Other and further 'importantobjects of the invention will be apparent from the following description and accompanying drawings.

On the drawings: .FigJl is anelevational View withparts broken awayand looking at the side of the .device on which the operator is positioned.

Fi 2 is an end view looking at'theright-hand end of Fig. 1 and with thedevice tilted down and in normal-position when the ,bit is set and locked into the collet.

Fig. 2a is an enlarged perspective view of part. ofthe adjusting means for presetting the bits and shown in the elevation at'the left of Fig. 3.-is .an.elevation looking .at the side of vthe-device opposite to the-side shown in Feg. 1 and with the samei-n upright position.

.Fig. Axis a partiallycross-sectional view taken on a, planeindicatedby line 4-4 of Fig. 3.

.Fig..5-is an endview looking at the end of the device shownaat the :left of Fig. 1, and withthe shaft of thevcam means incross-section.

,Fig. -6-is;a.cross-sectional view of the chuck, collet :,and :cam member and rotating means therefor.

.Fig. 7 is a perspective of atypical routing bit whose reduced .end portion is adapted to be ground on said device.

Fig. 8 is an end view of a routing bit showing a typicaLnon-radial face to ;be ground.

fE'ig. ."9 is 'a perspective view. of another type of routing bit, such as may be re-ground with my device.

Fig. 10 is an enlarged view of the end portion of the shaft which carries the cam and having a graduated bit adjusting and presetting means thereon.

Fig. 11 is a cross-section taken on line I of Fig. 10.

Referring to Figs. 1, 2 and 5, numeral l designates a pivotally mounted metal shelf or base, which is mounted upon any stationary support (not shown) adjacent a grinding machine and abrasive wheel. Said shelf or support In carries an arcuate flange II which is preferably integral with shelf l0 and which is disposed radially with respect to pivot or post |2 on which my device is swivelly mounted with respect to said shelf.

Numeral I3 designates a metal base which is swingably pivoted for horizontal movement on pivot post |2. Post I2 is secured to shelf I0. Base |3 has an integral apertured crank lever or post |4 (Fig. l) on the upper end of which a crank lever |4a is secured. The lower projecting end of said post has an integral cam l5, which when rotated to certain positions will engage the side face of flange II to lock the device in desired position with respect to the shelf particularly during the grinding operation. Numeral l3a. designates a spacer block or flange which is carried by or is integral with base I3.

Base 3 has a pair of integral upwardly extending journalling extensions l6 and |6a recessed at their upper ends and journallin blocks IT are removably secured by screws l8 to provide journalling boxes for the opposite end portions of metal shaft l9.

As shown in Figs. 1, 2 and 4, a metal frame or cradle 20 of substantially U-shaped form has a pair of aligned holes in the opposite upwardly extending end lugs 22 and 23 thereof which journal on said shaft. Said cradle 20 is rockably mounted on and supported by shaft |9. Referring to Fig. 3, the central part of said cradle has an upwardly exending rear side passaged boss or lug 2| in which is slidably mounted a thrust pin 24 whose lower end normally engages the upper face of the shelf l0. As shown in Fig. 3, cradle 20 carries an upwardly extending member 25 whose upper end portion forms a guide or track 26 which faces inwardly of the unit for a purpose hereinafter described. Member 25 preferably has an enlarged slot 21 as indicated. Said member 25 has journalled in aligned passages in the opposite ends thereof a manually rotatable shaft 28 which has a knurled hand wheel 29 on the projecting end thereof.

The intermediate portion of shaft 28 is threaded and has threadingly mounted thereon a block 3|] whose lower face is inclined as shown and which face normally engages the upper end f pin 24. It will be understood that rotation of the shaft 28 in counterclockwise direction will move the block 30 to the left and counter movementwill move said block to the right. When said block is moved to the left the cradle and parts thereby supported are moved away from the viewer of Fig. 3 and consequently the bit hereinafter described may be gradually moved closer to the grinding wheel as the grinding operation progresses. This means constitutes a manually controlled means for moving the bit toward or away from the abrasive wheel.

Referring to Fig. 1, numeral 3| designates a substantially U-shaped metal frame whose lower vertically disposed projecting end portions have a pair of aligned apertures in which are mounted a pair of bearings 32, one of which is shown in Fig. 2, said bearings being journalled on the end portions of shaft l9 immediately adjacent the extensions 22 and 23 respectively. Said frame 3| has an intermediate integral connecting bar 3|b as shown in Fig. 1.

The upper portions 3| 0 of frame 3| have mounted therein a pair of ball bearings 33 as shown in which is rotatably mounted the cam shaft 34, as shown in Figs. 1, 3 and 6.

One end of passaged cam shaft 34 projects beyond one of the frame portions 3|c and has rotatably mounted therein an inner shaft 59 which carries a knurled wheel 35 secured thereon. As shown in Fig. 6, the inner end of shaft 59 has a threaded passage in which is threaded the inner end of the collet 6i] in which the butt end of bit to be ground is adapted to be releasably' mounted. Said extendin portion of cam shaft 34 has a recess 36a therein to provide for seating thereof into a recessed locking plate 36 Which is secured by screws or the like in upwardly extending position to a boss 31 formed integral with base |3 as shown in Fig. 5 and at the left of Fi 1.

The intermediate portion of shaft 34 has mounted thereon a metal sleeve or cylinder 38 (see Fig. 4) whose cam surface is gradually reduced from one end portion thereof to the other. The opposite ends of shaft 34 extend through transversevly extending slots in the metal end plates 39 and 40, one of which slots is partially shown in Fig. 5. Said end plates form part of the outer housing of the unit and the same have angularly bent apertured edge flanges 39a and 40:]. respectively, which facilitate mounting of a U-shaped metal hood 4| which is partially shown ifini erd view in Fig. 5 and in partial section in As shown in Figs. 1, 3 and 4 boss or lug 2| has a horizontal passage in which is journaled a short shaft 42. The base or frame 20 carries on its lower end an inner passaged boss 43 whose passage is in alignment with the passage of boss 2| and the inner end of shaft 42 is also journaled in said passage of boss 43, as well as in boss 2|.

As shown in Figs. 3 and 4 the outer projecting reduced end of shaft 42 carries a knurled wheel or handle 44 and a friction spring 45 is mounted between wheel 44 and the shell or hood 4| for the purpose of causing the said wheel and shaft to remain into whatever position it is set and to assist in maintaining engagement between thrust bearing 46 and the arcuate side facing track 26. Numeral 44A designates a pointed indicating arm which is connected to shaft 42 and handle 44. Its upper point moves along numbered markings 58 on shell or hood 4|. A metal adjusting lever or arm 48 is secured on the inner end of portion of shaft 42 as shown in Fig. 4 and the same extends upwardly and has rotatably mounted on its upper end a metal sleeve or thrust bearing 46 which is secured in position by nut 41. v

The lower portion of thrust bearing 45 slides or engages track 26 (Fig. 4) in which engage: ment it is maintained with the aid of springs 53. Opposite to track 26, bearing 46 slidably engages the cam face of cylinder or cam sleeve 38.

A pair of threaded bolts 50 and 5| have one end of each thereof mounted in member 25 at opposite ends of track 26. Passaged spacers 52 are s idably mounted in said bolts respectively adja- .centisaidmrack 12 6. :Said azhol 'ts 1-151! :and 51 have ;mounted zthereon-zexpansion; sprin s153, :onlyccne f "which shown in Fig. 4 "and -:which thrust ragainst:twoxrecessedsthrustplates; SS'VrrespectiVel-Y, whichplates arelsuitably secured. :againstzthe side face of cross :arm 3! bcftframe 131 v. The; normally outer ends f said bolts shave zdepending :metal ,istop. membersifiisecured-i thereon by; suitable flock nuts whichAimittheyroizking movementxofl'frame 3| .in one i direction.

Itxwilllbe understood ithatiasgframe 3' .is :rockable 1 about bearingsmntshaft i l 9 the martial -rota-, tion :;of the roam sleeve .38 which islides against bearin 146) a will cause ::a :vrocking movement :of frame 3 l tandzshaft 4 whichmockingmcnement compresses the r-springs 1.53, and :that .aas :the fcarii is moved beyond;maxinmm projection .:of :the cam facathe.,springsiiiamovesaidaframefiI (with shaft 34) in a direction toward bearing'flfirand track 2B. The-:resultisz a;substantially;horizontal adjustable though-:arcuate movement of: the shaft :34 :with its .r:bit holdinguneans herein described. The extent of :such :movement ;in substantially horizontal direction is .amanually controlled according to xthesdegree "the/tithe luser rotates shaft -34 andwheel=35;-and"thelengthand path 'of; such movement is changeable l-according topthe ,posi- 'tion to which gbearing A16 rand arm ,48 are posi- -tioned manually. 1T0 ;.facilitate,proper;.presetting for therpart-icular. size andcurvatureiofsbit being i 58, with: number :jin'dicia are preferably: provided :on 1 the ;:shell .:or hood -;4 I and part of which "are .shown inhFigs. 2:and::5.

Referring :totFigs. 1-Ocand 11 which illustrate :a modifiedform of myinventionznumeralfl8;'desi nates -.a metalscollar-which :is adjustably mounted on the projecting end portionzof :the-camgcylin- :der' 38a which. projects. .throughichood '4 i a. Cam cylinder. 238a; has .;a plurality of; adjacent recesses 19formed thereon :as shown inFigure 11. ,A screw 80 is'threaded; intathreaded passagex 8 Igof the 1 boss 82 .of collar :18. :GollarI 18 bears spaced graduations and indiciasflZ-asshownirrEigure 1.0. Onlypart of theenum'bered markingsareshown inj FigurelO. v.Ifheseirrdiciaand markings are :preferably in rrelation :to :onethousands ;of {an inch. A-suitable: mark (not shown) .iis rplacedson the end wall of :hood 4 I a; which :is 10105881; 5120 "the handle 35aandsubstantiallynpposite:theilowest numb'errof the: indiciabBZ, for example zero. ,The extentof manual rotation of handle 35a, shaft 59a; cam cylinder'fidmacam 3.8,,cand;a bit mounted in. the colletcan bezobserved'yby :thezoperatonwho can therebyregulaterand.limitrtheextent of: such trocking movement :to 'thedesired-degree.

:Asshow-n inFigs. l1i1and13, :the base 13 jhas ran integral upwardly extending hoss :6 I "which alias a horizontal :bore. .or passagesrtherein' indicated. in dotted lineswat thenightcineEighl. .zAxhorizonta-l stub shaft 62 s is :journaledi in .said passage andxa metal adjusting 'preesetting :arm i454 :lis :securely mounted on its outer projecting end, andia'retainin collar 63 is secured on 'zitssinnertend.

As shownjnarf'igure '2a,:pre+setting ;arm; 64 has i journaled .in :an upper passage .:-thereof :a 'ZStl-l'b shaft 55,. shown in'dotted linestin liig. 1, andian .indicia-bearing graduated "wheel 6-5 ::is :mounted on its-outerend. :On its-inner end shaftn55 -:carries an annular. pro-setting member -6.1 which has twoflat side-facesswhich join invan apexiasuindicated in FigureHZ. The=upper:-endof armifidrhas a mark thereinvasiindicatedatsthe zupperrightsof Fig. 2 with -=which :the graduations of wheel-5.65 :are adapted:to-aberregistered.

candztheir juncturecomprisesthecutting edge 14 'whichrequiresperiodic rte-sharpening which has itOibB accomplished by grinding away;the curved face 13. necessitates the. substantially unidformrotation of the tbitiduring grinding and .as .z-thejoit is .:rotated.( during grinding) ..to; an extent where.the..abrasive .actiouhasyreached the cutting edge, ,rthe bit has to bemoued away from the grinding wheel so :that the annular surfaceheinning at ,edge 15 willqmeetgthe face of the .-;;grinding swheeliproperly and: so that the annular face ;.from 1.5 :to the cutting :edge :will .;be

, groundruniformlyand to the :same extent and without changing theangleflof-therake of the 1-bit. Accomplishment ;of. correct grinding. of such -airnoneaxialsannular11bitrace-(by hand gripping of the .bit. is :extremelyflifficult and seldom accomgplishedsaspractically all; grinding by hand grip- ,pingcresults. in taking off the metalstock nonuniformly andin changing the angle of :the: rake, with the result .of -inefficient routing and short lifeof :bits.

It is to be understood that when the operator desires tosetmy noveldevicethe graduated wheel I .30 ground, :a ;-plurality 50f; radially lspacedymarkings -66; is set-to-the desired angle by getting one of the igraduated-imarks aligned with themarkon-the upper end :of the :arm 64 and the device ,ishset :asillustrated in r'Figgza. Thetcradle. 20 is vthen :elevated.toanuprightposition so that the track gzfiaabuts.againstthegthrust-bearing 45 which has been setat thedesired predeterminedposition'by theioperator along .the'cylinder 38, saidlast mentionedadjustment :being' brought about by-the :desiredxmovement of the handle 44 with the consequent setting of-thelever ds. ,As the shaft 59 rotates,- itwill .be seen that the frame 3| will be :caused to rock-:and :that the grinding will occur uniformly andaspredetermined by the operator, :gbothas to :theangle of the grinding desired'and :the .amountof materialremoved. FigsDZ and 5 :show the device :in a work positioning set-up.

'As; many changescould be made in the above 1 construction andas; many apparently widely different i embodiments of 4 my invention, within :the scope of the claims could be constructed without departingifromsthe spiritxor scope thereof, it .is intended that all matter contained in the accompanying "specification shall be interpreted "as illustrative'and not in a limiting sense.

I claim:

-1.In a device of the described class, a movable base member a cradle pivotally connected to said base :member; :a Lu shaped metal frame within said cradle, pivotally: connected at its lower end :portion with respect to said cradle and adapted to "rock transversely therein; :a manually rotatable shaft 'journa'led :inthe upperwportions of said frame; releasable ibit gripping means on one'end of -said shaft; an elongated tapered cam on said shaft; an adjustable means .operatively connected tocsaid cradle :and normally slidably engaging said cam,saidaadjustable means being adapted to permit variationiin the length of the rocking movement of-sai'd cam by'the varied adjustment thereof along said cam, the. rotation of said cam being-adapted. to rock transversely the upper por- .tion 0f saidfframe andto move said shaftandcam in 2a, generally- :horizontal direction and a spring means operatively connected tosaid *frame and connected to the clipper portionflo'f saidycradle for moving the frame and shaft in one direction and for maintaining a sliding contact between said cam and said adjustable means;

2. In a device adapted to be adjustably mounted with respect to a grinding wheel; a base having upwardly extending journaling elements; .a transverse shaft mounted in said journaling elements; a cradle rockably mounted on said shaft; a substantially U-shaped frame having apertured depending extensions journaled on said shaft and having upwardly extending bearing supports; an elongated tapered cam shaft journaled in the upper portions of said frame; an adjustable bit-holding means carried by said cam shaft; a transversely extending track member carried by said cradle; a manually adjustable arm pivoted with respect to said cradle and having one portion thereof normally slidably engaging said track member and normally engaging the cam surface; and spring means connecting the upper portion of said cradle and the intermediate portion of said frame for maintaining said cam surface in sliding contact with said arm and for effecting substantially horizontal movement of said cam shaft and of the upper portion of said frame; the length of rocking movement of said shaft being adjustable by changes of position of said arm.

3. In a device adapted to be adjustably mounted with respect to a grinding wheel; a base having upwardly extending journaling elements; a transverse shaft mounted in said journaling elements; a cradle rockably mounted on said shaft and between said elements; a substantially U-shaped frame journaled on said shaft and having upwardly extending bearing supports; an elongated tapered. cam shaft journaled in the upper portions of said frame; an adjustable bitholding means connected to said cam shaft; a transversely extending track member carried by said cradle; a manually adjustable arm pivotally connected to said cradle and having one portion thereof normally slidably engaging said track member and normally engaging the surface of the cam shaft; a graduated member for indicating the position of said arm; and spring means connecting the upper portion of said cradle and the intermediate portion of said frame for maintaining said cam shaft in sliding contact with said arm and for effecting substantially horizontal movement of said cam shaft and of the upper portion of said frame; the limits of the transverse movement of said cam shaft being adjustable by changes of position of said arm with respect to the surface of said cam shaft.

4. In a device adapted to be adjustably mounted for movement with respect to a grinding wheel a base having upwardly extending journaling elements; a transverse shaft mounted in said journaling elements; a cradle swingably mounted on said shaft; a substantially U-shaped frame journaled on said transverse shaft; an elongated longitudinally tapered cam shaft journaled in the upper portions of said frame; an adjustable bitholding means on said cam shaft; supported manually adjustable means in slidable engagement on the cam shaft and being movable longitudinally of said cam shaft to thereby cause a substantially and varied horizontal movement of said frame, cam shaft and bit holding means; and spring means connecting said cradle and said frame for maintaining said cam shaft in sliding contact with said adjustable means; the transverse movement of said cam shaftbeing adjustable by said adjustable means. I r

5; In a manually operable device for holding, rotating and moving a cutting bit toward and away from a moving grinding surface; a base adapted to pivot on a stationary support; pivoted supporting means on said base; an elongated tapered cam shaft journalled on'said supporting means; means on said cam shaft for holding a cutting bit; and supported adjustable mechanism adjustably engaging said tapered cam shaft longitudinally of said cam shaft and for moving said pivoted supporting means in a substantially and varied horizontal direction to provide for selectively presenting portions of a rounded bit surface to be ground into grinding engagement and also for preventing such engagement of other parts of said bit, the adjustment of said adjustable mechanism' being adapted to adjust the length of the rocking stroke of said pivoted supporting means.

6. A device as described in claim 5 and having means for releasably locking said base in desired position with respect to a grinding wheel.

'7. In a device for holding and moving a cutting bit in a non-concentric path; A rockably mounted supporting means; an elongated gradually reduced cam journalled in said supporting means; means on said cam for holding a tool; adjustable means operatively connected to said supporting means and being in slidable engagement with said cam along the length thereof and adapted to provide for rocking movement of said supporting means and said shaft whereby selected portions of a gripped tool will be advanced to permit gradual engagement thereof with a movable grinding wheel, the length of the rocking movement of said cam being adjustable by changes of position of said adjustable means longitudinally of said cam.

8. In combination, a device as'recited in claim 5; a mechanism including an arm pivotally connected on said base, a manually rotatable and adjustable mechanism journaled in the outer end of said arm, said mechanism having an angularly faced shaft adapted to be pre-set to coincide with the flat face of a routing bit, said last mechanism providing for selectively pre-setting cutting bits into desired and predetermined position in said bit holding means so that such bits can be ground with a predetermined and correct rake.

9. A device as recited in claim 5, wherein said cam shaft is gradually tapered from one end toward the other, and wherein said adjustable mechanism includes a movable arm normally engaging said cam shaft, said arm being adapted to provide for predetermined presetting of said pivoted supporting means with respect to said cam shaft and being adapted to provide for predetermined non-axial rotation of the bit holding means and of a bit mounted therein so as to permit presentation of a non-round surfacepf such bit to a movable grinding surface and for a predetermined rocking stroke of said supporting means.

10. In a device for holding routing bits or the like and providing means for rocking such bits in a predetermined arcuate path during grinding thereof; a base, a pair of spaced supports on said base; a frame member pivotally connected at its lower portion to said supports; a fiat side face on the upper portion of said frame member; an adjustable pivoted arm supported by said frame and normally engaging said side face; a transverse manually rotatable shaft journalled in the upper part of said frame member; means for releasably holding a'tool orbit atthe end of said shaft; and a cam cylinder gradually tapered longitudinally and mounted on said shaft, and being selectively engageable along the length thereof by said pivoted arm; the movement of said adjustable pivoting arm being adapted to vary the distance between said side surface of said frame member and the longitudinal axis of said camcarrying shaft whereby different and varying curved paths of movement are achieved and a tool mounted, at the end of said shaft may be effected so that tool surfaces non-concentric with the axis of the tool may be correctly ground.

11. A device as described in claim 10 having a manually adjustable means for predetermining the rake of a bit to be ground and providing for measuring intermittently during grinding of the angle and rake of a bit mounted in the bit holding means; and having manually controlled means for said frame and parts carried thereby adapted to slowly feed the held tool into engagement with 20 a grinding wheel.

WILLIAM W. WARFEL.

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

Images