Патент USA US2411633код для вставки
yNOV- 26, 1946` ` " ' A. oBERHoLTZ, JR ' ABRASIVE 2,411,533 BEAMER Filed Dec. 21, 1942 1 . \ Y 76 ' JNVEN ToR. ANTHo Y oBERHo rz,./R. BY AT TORNE Y. - 2,411,633 Patented Nov. 26, 1946 UNITED STATES PATENT OFFICE 2,411,633 ' ABl'tAslvE BEAMER Anthony Oberholtz, Jr., Los Angeles, Calif. Application December 21, 1942, Serial No. 469,590 IZ Claims. (Cl. 51-1843) 1 . This invention relates to improvements in abrasive reamers of the type illustrated in United States. Letters Patents 1,841,343, 1,910,658 and‘ 1,910,659; although the teachings of the present invention may be employed with equal advantage in connection with other types of honing and reaming devices. 'o It contemplates more especially the provision of improved means for increasing the range of bore sizes that may be honed. or reamed, and more particularly enables muchL smaller bores to be honed Without sacrificing the large range of bores with the same tool serving the entire range. Physical limitations in strength of blades and 2 are rigidly supported for substantially their en tire length so that the reamer will ñnish a hole exactly true even under forced operations in an' increased range of honing sizes. A further object is to provide a reamer With a readily detachable micrometer adjustment that will not limit or define the Aminimum size of hon ing attaina le with any reamer unit of wide size range. A still further object is to provide an improved blade structure for an. abrasivereamer thaty corn bines rigidity with overall size rdiminution and interchangeability with blades of standard size range, - - , Still a further object is to prov-idean increased moving parts primarily controlled the size of the 15 length blade `with aj minimum honing size diam bores that could be advantageously bored or roamed with a single tool. Strength and full sup port of the blades is essential or at least desirable in that such is conducive- to precision operation over an extended period or the life o_f the tool. Reduction in the diametric size of the blades eter to accomplish v rigidity and increased size honing range with aV reamer of single reamer unit. Other objects and advantages will appear from the following description of an illustrated em bodiment of thepresent invention. In the drawing:` without weakening the strength thereof is> the limitingk factor in the size range. To weaken the» blade structure Wou1d,` when the operator forced~ , . ` Figure 1 is averticalside view in elevation and partiallyin section of an abrasive reamer em bodying features of the present invention. 25 , the enlarging adjustment too vigorously,_¿distort the blades and the~ honing operations would be inaccurate,> not circularly true, and unsatisfactory from a. mechanical standpoint. _ Rigidity o_f blade _structure is important and to accomplish dependable, satisfactory honing oper 30 ations over extended periods, increased honing y size range should not'be accomplished to the det riment of' rigidity orraccuracy. This presents a problem; of combining normally oiîsetting fea-l tures, namely, increased> rigidity tends to deter mine minimum size limits of the honing blades. The teachings of the present invention has. ac complished an increased range of honing opera tions. without sacrincing rigidity and honing ac Figure 2 vis a vertical edge enlarged sectional View in elevation taken substantially along line II-II of Figure 1. ' » Figure 3 is an enlarged side fragmentary viewy in elevation of the adjusting end of the reamer with the shoes or blades assembled therewith, the detachable micrometer adjusting instrumentali ties being shown in dotted outline. Figure 4 is a side sectional view of the other end of one of the blades or shoes taken substan tially along line IV-IV of Figure 2. ' Figure 5 is a side view in elevation of the mi crometer adjusting deviceV that is detachably as sociated with the end of the reamer and shown 40 in dotted outline in Figure 3. Figure 6' is an enlarged fragmentary side view One object of the. present invention is; to pro in elevation of the adjusting vend of the reamer vide an abrasive reamer construction inwhich with one blade abrasivev shown in section and the shoes or blades of widely different> diameter or other in full outline. size may be substituted quickly and conveniently, Figure '7 is a section of view taken substantially so that‘but one reamer is required fora wide size along line VIl--VII` of Figurey 2, one edge of an rangefof honing operations. abrasive liner being shown unattached. Another object is to kprovide an abrasive reamer Figure 8 is a sectional view taken substantially construction having a diametral expansion which along line VIII-_V111 of Figure 2. ' f can bey accurately and reliably gauged by almi-` crometer adjustment. to a small lfraction. of a 50 Figure 9 is an edge view in elevation of the curacy. Y ' ‘ smaller blade size construction compared to the larger size blade construction shown in Figure 1. serving as an obstruction- to small size honing Figure l0 is a plan view- of the improved small diameters. blade shovvn> in Figure 9.> Still another objiect. is to provide an abrasive 65 size The structure selected for illustration isì not reamer, the expanding shoes. or bladesÍ of which thousandth part oi an inch Without the latter 2,411,633 3 intended to serve as a limitation upon the scope or teachings of the invention, but is merely illus trative thereof. There may be considerable varia tions and adaptations of all or part of the teach ings depending upon the dictates of commercial practice. rThe present embodiment comprises a body l@ with flat parallel sides II and tapered edges l 2 providing a large end I3 and a small end I d or" the convergingly tapered body Ill.v rI’he small body end I@ terminates in an elon gated threaded extension I5 over which a bearing sleeve le is disposed to extend short of its length to accommodate a retaining end nut l‘l against the sleeve I6. The retaining nut il' is somewhat larger in diameter than the bearing sleeve I6 which receives a substantially larger collar I8 thereover to freely rotate thereon against end displacement precluded by a composite fiber and steel washer l2 which is somewhat smaller than the collar i8. ' To this end, the retaining nut Il has a dia metrically extending screwdriver blade receiving 4 socket 22 in the collar I8 is confronted by a simi larly concavely cupped blade receiving socket 31 provided in a blade retaining collar 38, which has a bore 29 therethrough to receive the driver shank ' 23 therethrough and provide freedom of move ment so that the retainer 38 will be free floating for support by a spring 49. The spring 4l) is of a standard, convolute type which envelopes the driver> shank 2.3 between the ñxed coupler member 2l and the floating blade end retainer 3S to urge the latter in the direction of the confronting blade receiving socket 22 in the collar I8. A plurality of emery cloth supporting blades 40C-lll, in this instance two, are shaped as coin plements of each other and the tapered body I0 -for retention between the end capped sockets 22-31 through the urge of the spring 2li. To this end the blades [MV-4I have arcuate projec 20 tions lS2-ll3 and ¿M_-¿l5 provided at their ex tremities to conform in curvature, size and shape `with the capped sockets 22-31 for retention slot 20 therein to provide for the rotation thereof therein when the tapered body Il) is received in relative to the threaded extension I5. oppositely and complementally inclined grooves The collar i8 has an enlarged peripheral ex 25 46~4l provided in the confronting surfaces of terior rounded shoulder 2l that is concavely end the blades diy-4I throughout the length thereof. cupped as at 22 to receive complementari end This enables the blades ¿lV-2| to be seated blades therein as will appear more fully herein throughout their entire length on the inclined after. A rectangular driving shank- 23 extends edges I2 of the `body I0 with the spring 40 nor from the large end I 3 of the tapered body liì to 30 mally urging them toward the collar I8 to assume terminate in a polygonal body 24 which is adapted their minimum diameter expansion so long as to be placed in a chuck constituting a part of a the spring 40 is unopposed except for the collar power turning tool, such as a portable electric i8' and its'retainer nut I 1 serving as a stop drill. The polygonal body 24 has an enlarged end _25, which has a substantially rectangular 35 A counter urge or force applied to the collar I8 socket 26 provided therein of somewhat larger will cause the blades 46h-¿Htc ride along the size than the end of the driving shank 23 to per diverging edges I2 of the tapered body il! to eñ'ect mit a limited degree of play or pivotal movement their expansion or recession from each other, therefor.'_ therebetween in all directions. ' The enlarged cylindrical end 25 of the polygo ' / v while the spring 40 is compressed to a correspond 40 ing degree. vIn this manner, the size of the bore nal driver 2li is retained in loose association with to bve-honed can be predetermined by limiting the the free extremity of the driver shank 2B by extent to which the collar I8 and the blades means of a coupling comprising a cylindrical cap dll-_4I are displaced along> the inclined body I0 21 that` has a central bore 28 somewhat largerv in’thejdirection of the driver 24, which is simul than the reduced shank 29 of the driver 24 and 45 taneously rotated by a power instrumentality, its Aenlarged end 25. The coupler cap 2l has an such as a standard portable electric drill. enlarged peripheral flange 3d that is comple It should be noted that the tapered contact mental to the cylindrical coupler member 3l that between the cuppedA socket ends 22-31 of the is press iitted in the open bore 32 deñned by the confronting members lf3-«38, respectively, serve peripheral flange S0, thereby maintaining the 50 to hold vthe complemental blades or shoes IIIV-¢1I driver 24 in loose association with the driver together with their tapered channels or grooves shank 23 in that the cylindrical coupler member ¿iS-_41 in full contact with the taperededges I2 3! has its closed end 33 bored as at Se for press of the body I0 for the entire length of the blades fitted engagement with the driver shank 23, to or shoes ¿lV-4 I. The channels or grooves 4-6-47 establish its rigid joinder therewith. in the complemental blades 4ß'-4| have a close _The coupler member 3l is ñtted to the driver but free slidable ñt against the edges I2 and shank ¿23 in a position to provide a limited space flat sides II of the body Il). 35 between the driver shank end and the bottom It should be noted that thegretainer end I‘I on of the socket 2li provided in the driver end 25. the'lbody extension I5 serves to limit the extent This allows the driver 24 to move axially on the 60 to which the blades or shoes ¿6L-4I may be dis driver shank 23 and pivotally to a slight degree in placed along the tapered body I0, and a calibrator all" directions owing to the fact that the socket is provided therefor to limit `the extent of dis 2S is somewhat larger than the driver shank 23 placement of the lbla-des INV-4I and their relative and the enlarged driver end 25 has an exterior expansion to 'denne a predetermined diametrical diameter Y somewhat smaller than the interior 65 honing size, to which a bore will be ñnished by chamber 35 of the coupler member 3l, so that the abrasive action of abrasive sheets 43-49 that limited universal movement is permitted between are detachably associated with the blades or shoes This the driver minimum shanklimited 23 and movement its polygonal is driver desirable lily-4I. ,To this end, the abrasive sheets ¿S8-49 are provided with substantially U-shaped edge owing to the fact that true honing can be accom 70 re-enforcing cleats 5Fl-5I that are clinched to plished >even though the operator holds the driven the side edges of the abrasive sheets 48-49 to end somewhat out oi alignment with the power driver, such as a portable electric drill, as will serve as attaching expedients therefor in con junction with the blades or shoes 40’-4l. appear more fully hereinafter. The cleats Sli-5I tightly ñt into side grooves The concavely end cupped blade receiving 75 52-53 provided in the parallel side walls 54--55 2,411,583 of each of the'complemental shoes 40’--4I. The 6 the maximum relative :recession or expansion of ' the blades or shoes 4û'---4I and thus determines side grooves or channels 52.--53 extend substan the honing diameter of the finished bore. tially for the length of the blades or shoes 4I|’---4I The micrometercollar 62 may be calibrated to proximate to the curved or arcuate abrasive sheet supporting surfaces 56 that constitute the 5 any desired scale, but it is preferable, though not essential, to -Ioe graduated in .0025v inch and the external operating surfaces over which the abra pitchof >the threads on the stop screw 10 and sive sheets 48-49 are tensioned for support. meshing threads 13 are such that one complete This renders the abrasive sheets 48-4‘9 together turnv of the stopI screw 10 is> .005 inch. Other with their cleats `5Íl---5I removable for replace graduations or calibrations may be utilized, vbut 10 ment with new abrasive sheets of corresponding thisis preferred. size and structural characteristics. In' adjusting the work to the hone, the stop Now, then, in order to adjust the -blades 4Il’---4I screw 10 is screwed out so that theblades or with their abrasive reaxning or honing surfaces shoes INV-_4Ik and their abrasive covers 48-49 48-49 to the desired bore to accomplish the best results and to effect a predetermined expansion 15 are expanded to ñll snugly the hole or bore to be honed, then the stop screw 10 is screwed in until thereof to impart the desired finishing size, an its tip 1I will just touch the retaining nut I1 elongated exteriorly knurled end bearing or man while the manual handle sleeve 51 is held against ual handle sleeve k51 has .one of its open extrem« the tension of the spring 4i). The hone blades ities 58 interiorlysized as at~59 for substantially HIV-4I with their abrasive covers 48-49 are now the length of the collar I8 to freely fit thereover set to the size of the hole or bore. Thereafter, for rotation relative thereto without any appre the stop screw 10 is adjusted by turning the ciable looseness or play therebetween. The in micrometer collar 62 in one or a repeated series terna-l end bore 59 of the manual handle sleeve of steps to the desired extent to which the hole 51 which fits over the collar I8, terminates in a or bore is to be finished. peripheral shoulder 50 deñned by the somewhat Assuming the hole or bore is to be enlarged .003 smaller interior bore 5I that communicates with inch, the stop screw 10 is backed out .003 inch, a somewhat larger collar bore 59 to denne the and -the lock nut 14 is then screwed to engage the Y micrometer collar -62. With the driver member The peripheral shoulder 60 contacts the corn posite thrust washer and limits _the inward move 30 25 in the chuck of the power drill that is held se curely in a vise„the power is started to turn the ment of the manual handle sleeve 51 relative to hone body l!! with its -blades 4ll-4I and abrasive Ithe collar I8, so that the sleeve edge 58 meets covers >Ail-»119. `Force is then'> applied on the with the rounded peripheral shoulder 6I! at the cupped end of the collar I8, thereby providing f knurled manual handle sleeve 51 to expand the while the high speed rotation thereof gradu contact along the peripheral shoulder 5B and the 35 hone ally cuts the bore to the size by continuing the open peripheral extremity 58 of the manual han force or pressure on the sleeve 51 against or in dle sleeve -51 with the collar I8 and its thrust the direction of the driver 24. The end :surface washer I9. . , ’ 15 of the enlarged head 12 on the stop screw 1II A calibrated micrometer >collar 52 is journalled on a reduced extremity 63 of the ymanual handle 40 can be held against they operator’s body to steady the rotation while the work is held stationary in sleeve 51 for rotation relative thereto, it being the operator’s hand relative to the rotating retained thereon by an interna1 split spring 64 yabrasive surfaces 48-49 that are supported by confined in an annular slot'65 of which comple the blades or shoes 40’--4I. This force is con mental >portions are in the confronting surfaces of the micrometer collar 62 and the sleeve ex 45 tinued or progressively applied until the Astop screw -10 has its tip 1IA in contact with the re tremity 63. ' tainer-'nut I1. This determines the predeter-v Consequently, the micrometer collar 62 is con mined size of the honed bore. nected to and rotates relative to the manual han In order to hone bores that are smaller in di dle sleeve 51. The micrometer collar -52 has an inwardly extending peripheral flange 66 at the '50 ameter than the manual handle sleeve 51 and the stop screw 10 preferably having an enlarged outer extremity thereof to re-enforce the knurled knurled head 12, the manual handle sleeve 51 is peripheral edge 61 and t0 present a radially ex detachably associated with the collar I8 so that tending longitudinal rib 68 serving asa key dis the hone I0 with its predetermined size of blades posed in a slot orv keyway 659» provided in and along an elongated stop screw 10 for >the entire 55 40’--4I may be displaced through the bore of the work, and thereafter the manual handle sleeve 51 length thereof between a reduced inward tip1 stop replaced with its stop screw 10 and enlarged 1I and an outward enlarged knurled head 12 knurled head 12 having a smooth curved surface serving as a turning expedient for the elongated tubular manual handle sleeve 51. stop screw 10. With this arrangement, the stop screw 10 ro 15 serves as a suitable stabilizing influence when 60 t’hebody of the operator is held thereagainst. It should be observed that the manual handle sleeve tates with the micrometer collar 52 While in threaded engagement with an inwardly projected 51 serves as a manually supported end bearing threaded cylindrical wall 13 provided in the ex treme end region 63 of the manual handle sleeve 51. A retaining or lock nut 14 threadedly en gages the stop screw 10 above the micrometer which is removably and rotatively associated withv collar 62 to retain it 'in adjusted position relative, the collar I8 for unobstructed attachment and de» , tachment therewith as part of the hone body ,i5 to fully accomplish the specified function and Y purposes therefor. For instance, this arrange f to the manual handle sleeve '51 so that the latter ment >permits the manual handle sleeve k5.1 to :be » may be displaced with the collar I8 and ¿blades 7_0 removed in the ordinary use of the -device to per»` or shoes dll-4I a predetermined distance in the mit a bore of a wrist pin or a bea-ring comprising, ydirection‘o'f the driver member ¿24 lto ‘compress the spring ,4G until the stop screw tip 1I engages the retaining nut I1 and this limits any further a vpartiof any other structural part or device to be passed over the abrasive sheets .A8-#49 `on the body Hl and, thereaftenthe manual handle‘sleeve displacementof the lblades or shoes -4Il’--4I rel: l 75 51 is replaced on the body Íend orco'llar `I8,'there-» ative to the `tapered hone kbody ID. This limits 2,411,633` 7 by enabling the honing of much smaller bore di ameters than is otherwise possible. So that full advantage may be acquired through 8 understood that the `invention is capable of con siderable variation and modiñcation without de parting from the spirit of the invention. I, there the use of a detachable manual handle sleeve Fil', fore, do not wish to be limited to the precise de an improved blade structure has been provided 5 tails of construction set forth, but desire to avail that takes care of the smaller bore diameters with myself of such variations and modifications as out'req'uiring a smaller size hone body l0 to which come within the scope of the appended claims. rigid, thick, standard blades or shoes ‘WL-él are I claim: adaptable to this end a much longer blade it l. In an adjustable abrasive hole-finishing cut (Figure 9) is utilized, so that the elfective abra 10 ting tool, the combination with a body, of a plu sive cover supporting length ‘il from the tip M’ rality of abrasive sheet supporting shoes adjust to the shoulder 45’ can be thinned down below ably associated with said body, actuator means the limits of the required rigidity to accommodate the same channel or groove 45’ therein. By thin ning down the' effective abrasive surface Ti, smaller diameters are provided and still the same channel or groove 46’ is accommodated at the expense of strength and rigidity at this portion; however, the increased length of the blade 16 provides an inoperative and appreciably heavier portion 18 between the shoulder 45’ and the ex treme vextremity 45", which compensates in strength for the weakened reduced portion 'l'i interposed between said body and said shoes for expanding and contracting said shoes relative to each other, means on the end of said body for op erating said actuator means, an unconnected end bearing removably and rotatively associated With said body for unobstructed operative attachment and inoperative detachment therewith to serve as a manual handle sleeve and calibrated means on said end bearing said calibrated means cooper ating with said actuator means to control the ex pansion of said shoes to a predetermined limit that determines the minimum size bore that can from an initially set relative position. be honed below that which was possible with the 25 2. In an adjustable abrasive hole-nnishing cut uniformly shaped blades or shoes flû’~4l. ting tool, the combination with a body, of a plu In- the thinned down portion Tl, which carries rality of abrasive sheet supporting shoes adjust the abrasive covers L18-‘19, the inclined channels ably associated with said body,`actuator means d6’ therein approach thev outer surface to an eX interposed between said body and said shoes for tent that an opening 'i9 occurs therethrough just 30 expanding and contracting said shoes relative to in front of the shoulder 45', but the increased each other, means on the end of said body for cp thickness of the ineifective honing portion 'iii pro erating said actuator means, an unconnected end vides the necessary strength to compensate there bearing removably and rotatively associated with for and the comparative weakness of the thinned said body for unobstructed operative attachment down portion 1l. ~ 35 and inoperative detachment therewith to serve as It should be noted, however, the blades or shoes a manual handle sleeve and calibrated means on 16 of increased length are accommodated by the said end bearing, said calibrated means cooperat samehone body l0 owing to the fact that in the ing with said actuator means to control vthe eX smaller diameter blades or shoes 15,'the effective pansion of said shoes to a predetermined limit honing surface l1 is appreciably shorter than for 40 from an initially set relative position, said last the blades dill-¿I of standard'and uniform thick named means comprising a sleeve journalled for ness throughout. In the smaller diameters to be rotation relative to said actuator means, a gradu honed, the length is notl an important factor and ated slip collar on said sleeve, and a stop pin ad for that reason correspondingly shorter abrasive justably connected to said sleeve through said covers are provided which are constructed similar 45 graduated collar. to the abrasive covers 48-49 and engage in cor 3. In an adjustable abrasive hole-iinishing cut responding side slots T9 provided for the effective ting tool, the combination with a body, of a plu length Ti of the blade or shoe 76. ` Two complemental blades 75 of smaller shape and size, are carried by the tapered hone body edges I2, and the eiîective honing portion 'Il of the blades or shoes 76 are provided proximate to the insert end of the hone body lll corresponding with the collar i8 which is cupped as at 22 to re ceive the corresponding end 44’ of the blade or shoe 16. ~ rality of abrasive sheet supporting shoes adjust ably associated with said body, actuator means interposed between said body and said shoes for expanding and contracting said shoes relative to each other, means on the end `of said body for operating said actuator means, an unconnected end bearing removably and rotatively associated with said body for unobstructed operative attach ment and inoperative detachment therewith to It will thus be app-arent that the combination serve as a manual handle sleeve and calibrated of improved blade or shoe structures 16 for small means on said end bearing, said calibrated means holes or bores together with the detachable speed cooperating with said actuator means to con sleeve 5l, provides a greater range of honing sizes 60 trol the expansion of said shoes to a predeter for the body i0 than was heretofore possible mined limit from an initially set relative posi owing to limitations determined by the speed sleeve and its adjusting head, as well as the de sign of the blades or shoes ASL-4H for any given hone body Iû. , It should be observed that different sizes in the uniformly shaped blades or shoes ddl-4E, as well as in the irregularly shaped blades or shoes 'l5 for smaller hones, are provided so that a range of hole diameters or bores of appreciably larger 70 and smaller size limits can be effectively honed without requiring more than one hone body lll tion, said end bearing comprising a sleeve jour nalled for rotation relative to said actuator means, a graduated slip collar on said sleeve, a stop pin adjustably connected to said sleeve through said graduated collar, and means inter posed between said collar and pin toinsure their connected rotation as a unit while permitting the longitudinal -displacement of said 'pin through said collar. 4. In an adjustable abrasive hole-finishing cut ting tool, the combination with a-body, of a plu rality of abrasive sheet supporting shoes adjust While I have lillustrated and described a pre ably associated With'said‘body, actuator means ferred> embodiment of this invention, it must be 75 interposed between said body and said shoes for and its auxiliary parts. anregen eff tapered faces andshoes provided with abrasive expanding andfcontractingsaid shoesv relative to members fitting thereon, cupped member on said each other, means on rtheïend of said body for operating said actuator means, an unconnected end bearing removably and ïrotatively associated body and iitting over the ends of said shoes to retain said shoes around said body, a spring posi tioned upon and along said body to bear against one of said cupped> members, an adjusting niem ber'threadedly engaging said body and adapted with said body for unobstructed operative attach ment and inoperative‘detachment therewith to serve as a manual handle sleeve and calibrated means on said end bearing, said rcali-brated means to bear against'v the other cupped member, an un connected' calibrated manual hand end bearing cooperating with said actuator means to control supporting sleeve removably and rotatively asso the expansion of said shoes to a predetermined 10 ciated with said adjusting member for unob limit from an initially set relative position, said structed attachment and detachment therewith end bearing comprising a sleeve journalled for ro to serve as a manual handle sleeve end support tation relative to said actuator means, a gradu and stop for said adjusting member, said cali ated slip collar on said sleeve, a stop pin thread brated speed sleeve including a slip collar, a stop edly connected to said sleeve through said grad 15 screw extending through said slip collar and uated collar, and a key andkey-way interposed threadedly engaging said speed sleeve, comple between said collar and pin to insure their con mental means on said collar and screw to insure nected rotation as a unit while permitting the their combined rotation while permitting relative longitudinal displacement of said pin through said collar. 5. In a cutting tool having a. central body with 20 axial displacement therebetween. _9. In a cutting tool having a central body with tapered faces and shoes provided with abrasive members fitting thereon, cupped member on said tapered faces and shoes provided with abrasive members ñtting thereon, cupped member on said body and iitting over the ends of said shoes to re body and fitting over the ends of said shoes to re said shoes around said body, a spring posi tain said shoes around said body, a spring posi 25 tain tioned upon and along said body to bear against tioned upon and along said body to bear against one of said cupped members, an adjusting mem one of said cupped members, an adjusting mem ber threadedly engaging said body and adapted ber threadedly engaging said body and adapted to bear against the other cupped member, an un to bear against the other cupped member, and an connected calibrated manual hand end bearing unconnected calibrated manual hand end bear supporting sleeve removably and rotatively asso ing supporting sleeve removably and rotatively ciated with said adjusting member for unob associated with said adjusting member for unob structed attachment and detachment therewith structed attachment and detachment therewith to serve as a manual handle sleeve end support and stop for said adjusting member. to serve as a manual handle sleeve end support 35 and stop for said adjusting member, a polygonal . 6. In a cutting tool having a central body with tapered faces and shoes provided with abrasive members iitting thereon, cupped member on said body and fitting over the ends of said shoes to driver member operatively connected to said body on the end opposite said adjusting member for ro tation therewith, and a collar coupler fixed to said body to engage said driver against detach retain said shoes around said body, a spring posi 40 ment from said body while permitting slight rel ative universal movement therebetween, tioned upon and along said body to bear against 10. In a cutting tool having a central body with one of said cupped members, an adjusting mem tapered faces and shoes provided with abrasive ber threadedly engaging said body and adapted to members ñtting thereon, cupped member on said bear against the other cupped member, an un connected calibrated manual hand end bearing 4,5 body and iitting over the ends of said shoes to re tain said shoes around said body, a spring posi supporting sleeve removably and rotatively asso tioned upon and along said body to bear against ciated with said adjusting member `for unob one of said cupped members, an adjusting mem structed attachment and detachment therewith ber threadedly engaging said body and _adapted to serve as a manual handle sleeve end support and stop for said adjusting member, said cali 50 to bear against the other cupped member, an un connected calibrated manual hand end bearing brated speed sleeve including a slip collar, and a supporting sleeve removably and detachably asso stop screw extending through said slip collar and ciated with said adjusting member for unob threadedly engaging said speed sleeve. structed attachment and detachment therewith 7. In a cutting tool having a central body with tapered faces and shoes provided with abrasive 55 to serve as a manual handle sleeve end support and stop for said adjusting member, polygonal members fitting thereon, cupped member on said driver member proximate to end of said body op body and ñtting over the ends of said shoes to re posite said adjusting member, complemental tain said shoes around said body, a spring posi means on saidy driver member and body end to tioned upon and along said body to bear against one of said cupped members, an adjusting mem ber threadedly engaging said body and adapted to bear against the other cupped member, an un 60 establish a driving connection between said driver member and body end while permitting their lon gitudinal separation, and a coupler fixed to said last named body end to embrace said complemen tal means for retaining said driver and body end connected calibrated manual hand end bearing supporting sleeve removably and rotatively asso ciated with said adjusting member for unob 65 together against separation while permitting structed attachment and detachment therewith slight relative universal movement therebetween. to serve as a manual handle sleeve end supportr and stop for said adjusting member, said cali brated speed sleeve including a slip collana stop ll. In a cutting tool having a central body with tapered faces, and abrasive supporting shoes ad justably fitted upon said faces, said shoes having 70 screw extending through said slip collar and ` a thin abrasive sheet carrying portion sized to threadedly engaging said speed sleeve, and an substantially conform with the dimensional limits enlarged finger grasping knob on said stop screw of said tapered body surfaces and a substantial to present a body contacting surface for assisting f ly thicker portion beyond and contiguous to said in the support of said speed sleeve. - 8, In a cutting tool having a central body with abrasive sheet carrying thin portion to compen 2,4115633 sate for the requisite overall body strength of said abrasive supporting shoes. 12. In a cutting tool having a central body with tapered faces, and abrasive supporting shoes ad justably fitted upon said faces, said shoes having a thin abrasive sheet carrying portion sized t0 substantially conform with the dimensional limits of said tapered body surfaces and a substantially thicker portion beyond and contiguous to said 12 abrasive sheet carrying thin portion, there being, a tapered slot in the bottom surface of and ex tending for the overall length of said shoes to serve as a complement of said tapered body sur faces With the thicker shoe portion serving to compensate for the requisite overall body strength of said abrasive supporting shoes in relation to said tapered slot. ANTHONY OBERHOLTZ, JR.