Document kmXJR97yX8nK7gQO6YgQjeZr0

May 5, 1953 R. E. WASLEV 2,637,145 MACHINE FOR FORMING ARCUATE CONTOURS Filed Nov. 12. 1.949 3 Sheets-Sheet 1 ncjr/. tNU=N7~OF^ ROY E: WASLErY TTCjrKfV^ KS" Exhibit: ^ .. Wit: HlOafe.____ Date: Rptr.Dtl -............... May 5, 1953 R. E. wasley 2,637,145 MACHINE FOR FORMING ARCUATE CONTOURS Filed Nov. IP. 1949 3 Sheets-Shoet 2 7 V' ,0 TTUFl /va- y's May 5, 2953 Filed Nov. IP. 1849 R. E. WAS LEY MACHIN3 FOR FORMING ARCUATE CONTOURS 2,637,145 3 Sheets-Sheet 3 /9E/C 4. ricj" 6. FnzT.-S. FTcj: 7. r T-ar^r^^/s Patented May 5, 1953 2,637,145 UNITED STATES PATENT OFFICE 2,637,145 MACHINE FOR FORMING ARCUATE CONTOURS Roy E. Wasley, Portland, Oreg., assignor of onethird to Ralph L. Burke and one-third to Mar tin R. Chirgwin, both of Portland, Oreg, Application November IS, 1949, Serial No. 126,888 12 Claims. (Cl. 51--96) 12 This invention relates to a machine for form is gained from the use of the machines by a ing an arcuate contour such as a machine for mechanic of only average skill. Also, both the grinding or dressing down arcuate brake linings conventional shoe clamping devices and the ad to give them the proper curvature to fit the cylin justing mechanisms make the grinding procedure drical brake drums in which they are to be used. 5 a rather slow and unprofitable operation tending In relining automobile brake shoes it is nec to discourage investment in the expensive ma essary to make some adjustment of the new lin chines. ing to insure that it will have the same radius The general object of the present invention of curvature as the crake drum with which it is therefore is to provide an improved machine for used in order that the whole length of the lining L0 forming an arcuate contour which will overcome on each shoe will engage the brake drum when the various shortcomings and disadvantages of the brakes are applied, wild this is particularly conventions! machines enumerated hereinabove, important where the brake drums have a some particular objects are to provide a machine which what larger than standard diameter. After a is relatively inexpensive to manufacture, which worn brake drum has been turned down to re 15 is less subject to wear affecting its accuracy, and move grooves and scratches from Its braking which may be used with such speed and facility surface, its inside diameter is greater than in that high quality of work may be turned out very new condition, and it will be apparent that a quickly by a mechanic of only average skill. brake lining having a radius Df curvature to fit Specific objects are to provide novel fast ad- a standard size drum will no longer properly fit 20 justment means to shift the parts into position the oversize drum. to accommodate the different standard sizes of When the brake linings are riveted to -the brake brake shoes, to provide mechanical indexing shoes it has often been thepraedee to use linings means for the fast adjustment, to provide an im of standard thickness and then insert shims be proved jig type of clamp for holding a brake tween the linings and the shoes having a thick 25 shoe in the proper position, to provide improved ness equal to the thickness oE metal removed fast adjustment means to compensate for over from the drum, but this expedient cannot be re size chums, to provide Improved feed means to sorted to when the brake lining material is se feed the work piece toward the grinding wheel, cured to the shoes by bonding. Ir. such case, and to provide simplified and more convenient Lhe necessary extra thickness must be supplied 30 adjusting and manipulating devices. by the lining itself. There is, therefore, an ad The foregoing and other objects are attained vantage for brake shoe servicing establishments in a machine having an oscillating work holder to adopt the standard practice of grinding the mounted on a pivot at a distance from a grind linings in al! cases, because it permits the use of ing wheel, The pivot is mounted on a base frame the same extra thick linings fur all relining work, 35 for fast adjustment toward and away from the thereby dispensing entirely with the use of shims grinding wheel and is located In the proper posi end. obviating the necessity for stocking linings tions for grinding curvatures of different radii of different thickness for bonding and riveting corresponding' to standard sizes of brake shoes and for standard and oversize drums. Each lin by mechanical indexing means as distinguished ing. after being mounted or. its shoe, is merely 40 from the usual visual indicator. A finer adjust ground down to lit the curvature of the drum in ment to compensate for oversize drums is pro which it is to be used. vided to adjust the pivot relative to said indexed Conventional grinding machines for this pur positions. In the present embodiment this fine pose have a number of shortcomings which have adjustment is effected by the rotation of an ec- limited their widespread adoption by the trade, 45 centric mounting for the pivot. notwithstanding the recognized desirability of The oscillating work holder is mounted for ra the grinding procedure in general. Presently dial movement relative to its pivotal support to known machines are costly to manufacture, awk provide "both a slow screw feed and also a fast, ward to adjust, and are susceptible to excessive sliding adjustment. A single handle oscillates wear in some of the moving parts by reason of no the work holder to pass the workpiece over the exposure of these parts to the highly abrasive grinding wheel and also has direct longitudinal .anaae? dust. In most machines the complicated movement to make the fast sliding adjustment nature of the adjustments requires considerable and rotational movement to operate the screw skill on the part of the mechanic to grind the feed. Thus, the preparatory adjustments are all linings to St properly, whereby little advantage SO of a quick-acting type which are independent of 2,637,145 34 the screw feed used during the course of the grind the careful alignment of scale marks 21 to 27 ing operation. with index mark 20. The Invention will be better understood irom The depressions 31-34 are accurately spaced the description in the following specification re on one-half inch centers, and the corresponding lating to the preferred embodiment illustrated 5 scale marks 21-24 are similarly spaced and po in the accompanying drawings. Various changes sitioned relative to the index marl: 20, for use may be made, however, in the details of construc tion end arrangement of parts and certain fea tures may be used without others, as will be ap with 9, 10, 11 and 12 inch brake shoes, respec tively, the dimension having reference to the diameter of the brake drum. The depression parent to persons skilled in the art. Although LO 35. is spaced one inch from depression 34 and the machine is illustrated and described as a then the depressions 3G and 37 are spaced at brake shoe grinding machine it may obviously one-half inch intervals, and the scale marks 25, be adapted to the grinding or machining of arcu 26 and 27 are similarly spaced, for use with 14, ate surfaces on other types of work pieces,and 15 and 1G inch brake shoes. These are the stand involving the treatment of materials other than i5 ard diameters of the most commonly used brake brake lining materials. drums on passenger cars and light trucks, and In the drawings: the purpose of this arrangement of the edge de Figure 1 is a perspective view of the machine pressions and scale marks on the slide plate 15 of the invention; will become apparent as the description proceeds. Figure 2 is a longitudinal sectional view taken 20 The slide plate 15 may be locked securely in on the line !!--2 of Figure 1: any one of its indexed positions by means of Figure 3 is a top' plan view of the machine; clamp screw 43 which engages a smooth surfaced Figure 4 is a cross sectional view taken on the portion of the edge of the plate 15 where there line 4--4 of Figure 2; are no indexing depressions, as shown in Fig Figure 5 is a perspective view of one edge of 25 ure 7. the slide plate supporting member showing the The slide plate 15 carries an integral depend series of depressions which are engaged by spring ing hub 41 equipped on one side with an in detent indexing means; ternally screw threaded boss 42 receiving a clamp Figure 6 is a fragmentary sectional view taken screw 43 as shown in Figure 4. This ciamp screw on the line 6--6 of Figure 1; ::o has an elongated shank extending through a Figure 7 is a fragmentary sectional view taken horizontal slot 44 in the base frame 10 to ac on the line 7--7 of Figure 1; and commodate the longitudinal movement of the Figure 8 is a sectional view taken on the line slide plate. The hub 41 forms a vertical bearing B--E of Figure 4. for a short length of shaft 4 5 integrally attached The various parts of the machine are mounted o ) to the under side of an adjustable circular base upon and carried by a rigid base frame 10. plate 50. Shaft 45 is retained in the hub 41 Within the base frame 10 there is mounted an by a collar 48 on its lower end. On Its top side electric motor 11 to drive a tool 12 which in the the base plate 50 carries an upstanding stud 51 present embodiment is a cylindrical grinding which forms a pivot for a circular oscillating wheel having a suitable abrasive surface for dressing down the material of automobile brake linings. The top of the base frame 10 is equipped on its opposite sides with longitudinal ways (3 and 14 for a carriage in the form of a slide plate plate 52. The oscillating plate is secured on the pivot by a nut 53 having a flange or washer 54 to exclude abrasive dust from the bearing surface of the pivot. Adjustment of the pivot stud 51 relative to the supporting member 15. The opposite side edges ~;.5 indexed positions of slide plate 15 is effected by of the plate IE have sliding engagement with the the eccentric relationship of stud 51 and shaft ways 13 and 14 and the latter are either shaped 43 which is Illustrated to an exaggerated degree to prevent uplift of the plate or equipped with in Figures 2 and 8. Adjustable base plate 54 hold-down plates 16 and 17 for that purpose and is equipped with a handle 55 to rotate it, and to exclude grinder dust. 50 scale markings 56 extending around a portion On the hold-down plate 16, which is rigidly of its periphery to cooperate with an index mark connected with the base frame 10, there is an 00 bn the plate (5. The scale marks 56 are so index mark 28 and on one side of the plate 15 placed on the adjustable base plate 5a as to in there is a plurality of scale marks 21 to 27 to dicate'zero position with reference to the index cooperate therewith, designating standard sizes 55 mark GG when stud 51 is closest to grinding wheel of automobile brake drums. The plate IS may 12, as shown in Figure 2. Rotation of plate 58 be moved longitudinally in simple sliding move ment for fast adjustment by means of handle away from its zero position thereby increases the distance of stud 51 from the grinding wheel by 23 to position any selected one of these scale an amount which may be indicated in thou marks at the index mark 20. 01) sandths of an inch on the scale 56, independently The opposite side edge of plate 15 is equipped of the adjustment of the slide plate 15 relative with a corresponding series of conical indexing to its index mark 20. Plate 50 is secured In ad depressions 31-37 as shown in Figure 5 to be resiliently engaged by the ball detent 35 shown justed position by tightening the clamp screw 43 against shaft 45. ill Figure 6. Ball detent 30 is weed against the 05 Oscillating plate 52 carries a radinl guide block edge of the plate and into any one of these de 54 for a work holding arm 85 which slides lon pressions by a spring 33 seated against screw gitudinally therein. The arm may be clamped 39. Spring "8 has sufficient force and the plate in adjusted position by a set screw 65. The brake 15 slides with sufficient freedom to cause the shoe having the lining to be ground is clamped ball 30 to exert a cam action against the sloping 70 on one end of the arm 65 so that it may be passed walls of each depression to automatically center across the surface of grinding wheel 12 with the depression accurately on the ball once the a circular swinging motion centered on pivot stud ball has entered into the depression. It is to 51. Tire brake shoe which constitutes the work be understood therefore that the indexing of the piece in the present embodiment is designated plate 15 is mechanical and does not depend upon 75 at 7G and its lining at 71 in Figures 2 and 3. the 2,637,145 56 work holder thereby constituting' a brake shoe rest 83 engages the groove 95 for dressing a brake clamp, of jig. The shoe is removed from the shoe to fit a fourteen inch drum, and in this arm in Figure 1. case, the scale mark 26 would be set at index 20 The brake shoe clamp comprises a C-shaped with detent 30 seated in depression 35. It is ap- clamp member T2 equipped with a clamp screw s parent that the shifting of the parts from the 13 and a short cross arm 14 having corners 15 eleven Inch shoe position shown In Figure 1 to spaced equidistantly on opposite sides of the arm the fourteen inch shoe position shown in Figure 2 65 to engage the inside surface of the arcuate involves no turning of screw adjustments but portion of the shoe, as shown in Figure 3. The only the sliding of slide plate 15 two scale mark- edge 16 of the cross arm 14 which connects the 1 o ings to the left in fast adjustment and the sliding two comers 15 forais a chord across an arc of of work holding arm 65 two handle grooves to the brake shoe perpendicular to the longitudinal the right in fast adjustment. center line of arm 65 so that the geometric Bueh sliding adjustments are herein designated center of the arc will always lie in this center as fast adjustments to distinguish from the ordi- line. The clamp parts thru form a convenient 13 nary screw feed adjustments which are extremely jig for a shoe of the usual T-shaped cross sec slow acting adjustments. The possibility of error tion wherein the twro corners 15 locate the geo m these sliding'adjustments Is eliminated by the metric center of the arc of the shoe precisely provision of positive mechanical indexing means on the longitudinal center line of arm 65 and which serve as stops and abutments for the ad- wherein a flat clamping surface 17 furnishes a 211 justable members to obviate reliance upon visual horizontal table-like support for the web of the measuring devices which depend for accuracy shoe to maintain the axis of the cylindrical sur upon the skill and carefulness Of the operator. face of the lining parallel with the axis of the Assuming now that the brake linings are to be cylindrical grinding surface. This type of clamp dre-ssed on bre.ke shoes to fit- fourteen inch drums permits excessive tightening of the screws 73 23 in new condition, one of the shoes is approxi without danger of warping the shoe out of its mately centered in the clamp 72 with the web normal shape, but the shoe is securely held with of the shoe lying flat on the clamping surface 71 only ordinary hand tightening of the screw. The and the rim of the shoe engaging the two corners geometric r elationship just described is obviously 75 of the cross arm 74. Slide plats 15 is moved the same regardless of the radius of curvature 4ii in fast adjustment to seat ball detent 30 in de or length of the shoe. The other end of the work holding arm 66 pression 35, placing scale mark 25 at the indexmark 20. and the work carrying arm 65 is moved carries a horizontal pivot pin 70 for a screw- longitudinally through the guide block 64 in fast threaded handle stud IS in a handle 80. In the adjustment until the handle groove 95 will en- present embodiment, the stud J9 has an integral . gage the rest S3 as shown in Figure 2. Adjust U-shaped bracket 51 to receive the ends of pin able base plate 50 is rotated by handle 55 to place 18 so that the handle may be raised as shown the zero mark on scale 56 at the index marl: 60. in broken lines in Figure 2. When'the handle Then when the handle 80 is swung from side is thus raised and the clamp screw 66 loosened, to side and rotated to impart sufficient feed move the arm 65 may be caused to slide through the 'll ment to work holding arm 65, the drum engag guide block 64 to move the brake shoe toward ing surface of lining 11 will be dressed down by or aw-ay from the pivot 5!. The slide block 64 grinding wheel (2 tD a true circular arc having is also equipped with a horizontal arm 02 having exactly the same radius of curvature as its four an upstanding handle rest 03 at its extremity. teen inch drum. Screw feed movement of the The handle is internally screw-threaded at 84 handle 83 is necessary only for the purpose of re to fit the stud 19, and on its exterior surface the moving the high spots; as soon as the grinding handle has a series of grooves SI to 97 to engage wheel starts to' act on the whole length of the the rest 63 in different positions of the arm 65. lining it is apparent that the desired true circular Thus, when the handle is raised on its pivot arc has been obtained and that the grinding op- 78, the arm 65 may be moved longitudinally in 51) cratioh on that shoe is completed. After one fast adjustment to place one of the grooves 91 shoe of a set has been dressed in this manner, it to 91 in engagement with the handle rest 83. The handle may then- be rotated on the rest 83 is often found to be unnecessary to make any further rotative feed adjustment of the handle to provide a screw feed movement for the arm 85 in dressing the remaining shoes in cases where 80 in approaching the grinding wheel. In this s;j the removal of a considerable depth of material screw' feed movement, the handle 80 acts as a is not required, and then the clamp screw 58 may nut and the rest 83 as a thrust abutment for the be tightened if desired. The center of the oscil nut to cause stud 73 and arm 65 to move longi latory movement of the brake shoe when the tudinally' relative thereto. When handle 80 is handle 3D is swung from side to side is, of course, swung from side to side, the brake lining 71 on Co the axis of the pivot stud 51 and not the axis shoe 70 is swept across the surface of grinding of shaft 45 which is clamped in its zero position cylinder 12 in an are centered on the axis of stud 51. Any variations in the thickness of the in the present example. Let It be assumed now that one of the drums arcuate parts of different brake shoes are removed- had been badly scored and that in order to proby operation of the feed screw adjustment of ii5 vide a smooth braking surface in the drum it had handle SO without altering the length of the to be turned down on a iathe until a depth of radius of swing existing between the axis of stud 0.350 inch of metal had been removed, so as to 51 and the surface of the grinding wheel. increase the inside drum radius by that amount. To illustrate the adjustability of the work hold The same dressing procedure would be followed ing arm 85 the handle rest S3 is shown in Figure 70 except that adjustable base plate E(l would be 1 engaged in the groove S3 to dress a brake shoe rotated by its handle 55 to place- the 0,o5o mark for an eleven inch drum, the corresponding scale on scale 56 at the index mark GO. This adjust mark' 23 on slide plate (5 being located at the ment of the plate 0 would thereby turn the Shaft index 20 by engagement of ball detent 30 in de 45 through an angle sufficient to move the ec- pression 33. In Figure 2, however, the handle 70 centric stud 5 I to a position 0.050 inch farther 2,637,1-3 B. 78 away from the surface of grinding wheel.12.. Then other parts of the device. Advantages of the. ec upon oscillation of the work holding arm 65 about centric adjustment as a calibrated;fine adjust the stud 51 as a center, the radius of curvature ment are that it is subject to less wear than the of the dressed surface of lining 71 would be 7.050 usual micrometer screw type and that it may inches instead of 7.000 inches. It will be apparent r, more easily be shielded from the grinder dust. again that this grinding radius is not altered by It will be apparent from the foregoing descrip any longitudinal feed movement that may have tion that the handle 28 is not necessary to move to be imparted to the work holding arm 65 by the slide plate 15 as this function is even more rotating the handle 80, inasmuch as the center conveniently accomplished by the oscillating han- of oscillation of the brake shoe in the grinding 10 die 80 when the latter is engaged with its handle operation is determined solely by the position of rest 83 or when the clamp screw 66 is tightened. slide plate J5, and the position of eccentric stud Thus the operator may perform four different 51 relative to plate 15. Any movements of work functions with the single handle 80. This han holding arm 65 in its guide block 64 do not change dle will oscillate the work holder, make the fast the distance between pivot stud 51 and the grind- 15 sliding adjustment of the work holder relative to ingwhcel. Sts pivotal support, operate the slow screw feed The present eccentric adjustment obtained by for the work holder, and also make the fast sliding rotating plate 80 to vary the distance of the piv adjustment of the pivot toward and away from otal center of the work holding arm 65 from the the grinding wheel. Hence the fast sliding ad- grinding wheel is to be distinguished from known 20 justment of pivot 51 has the additional advantage eccentric adjustments for other purposes which of being operable directly by the handle SO where do not change the distance between the pivotal as in the conventional forms of such machines center of the work holding arm and the grinding it is impossible to move the pivot by means of wheel. It has heretofore been proposed, for ex the oscillating handle. ample, to provide an eccentric adjustment to shift 23 A suitable suction hood may be provided in a the work holding arm or carrier in a lateral di manner well understood in the art to dispose rection from its pivot, perpendicular to a line of the grinder dust. drawn between the axis of oscillation of the work Having now described my invention and in holder and the point of contact of the brake shoe what manner the same may be used, what I claim with the grinding wheel, but in such adjustments 30 as new and desire to protect by Letters Patent is: the work holder is merely shifted relative to its 1. In a machine for forming an swcuate con axis of oscillation to compensate for inaccurate tour on a workpiece, a power operated tool for positioning of the shoe in the work holder, with removing material from the workpiece, an oscil out changing the radius distance from the axis of lating work holding member, a pivot for said oscillation to the grinding surface. The purpose as oscillating member mounted for movement to of such prior eccentric adjustment is to obviate ward and away from said tool through a long the former practice of tapping the ends of the shoe to make them equidistant from the pivot axis where the clamp itself will not automatically range of adjustment to form contours of different radius, releasable detent indexing means for lo cating said pivot at different predetermined dls- accomplish this function. The present improved 48 tances from said tool, fast adjustment means for form of work holding clamp automatically posi moving said pivot throughout said long range to tions shoes of different sizes so that their ends position said pivot at said indexed distances, fine are equidistant from the pivot without tapping adjustment means for moving said pivot a short or any other lateral adjustment. distance relative to each of said indexed positions, In such prior known eccentric adjustments, the lii a handle movably mounted on said work holding eccentricity must be rather large to have the member for oscillating said work holding mem desired effect, whereas for the purpose of the ber, fast adjustment means operable by said han present invention, the eccentricity of stud 51 dle in one position relative to said work holding relative to shaft 45 Is so small as to have a member for moving said work holding member negligible side throw, none of which occurs be CD relative to said pivot, and screw feed means for tween the pivot and the work holding member. said member operable by said handle in another The eccentricity of stud 51 need only be equal position. . to half the maximum depth of metal that could 2. In a machine for treating a workpiece, a safely be removed in re-turning old brake drums, base frame, a power operated tool on said base to provide complete compensation in 180 degrees m frame, an oscillating work holder, a member of rotation of plate 50. In practice, the eccen having a pivot for said work holder, an inter tricity is preferably made a little greater than mediate member between said base frame and half the maximum depth of metal which may be said pivot member movable with said pivot mem removed from a brake drum, in order to shorten ber for fast long range adjustment of said pivot the scale 56 and reduce the adjusting movement sc member to different distances from said tool, re of plate 50 to provide a true, quick-acting ad leasable detent means for mechanically index justment. It is considered that the maximum ing said intermediate member in a plurality of depth of metal which may be safely removed in different predetermined positions relative to said turning worn brake drums is 0.125 inch which is base frame throughout the range of movement equal to two sixteenths of an inch. Hence an ec 68 of said pivot member, and fine adjustment means centricity of only one sixteenth inch would pro for positioning said pivot member toward or away vide full compensation by rotating plate 50 from said tool relative to said intermediate mem through 180, and an eccentricity of two six ber. teenths of an inch would shorten the scale 56 3. In a machine for forming an arcuate con- to 90 of the periphery of plate 50. 70 tour on a workpiece, a power operated tool for . It is to be noted that the present eccentric removing material from the workpiece, a support adjustment is a fast adjustment as well as a ing member mounted for fast long range ad fine adjustment but it is generally referred to in justment toward and away from said tool, an the claims as a fine adjustment to distinguish oscillating work holder, a pivot for said oscillat- from the fast long range sliding adjustments in 75 ing work bolder, a fine adjustment rotatable sup- 2,037,145 9 10 port for: said' pivot having ah' axis of rotation pivot for said oscillating, work holder, and ec parallel and. eccentric to the axis of said pivot, centric means for mounting said pivot on said ana means for mounting said rotatable support supporting member for fine adjustment. of the on said supporting member for rotation on said oscillating axis toward and away from said tool axis of the support, the distance of said pivot relative to the indexed positions of said support from the tool being determined in part by the ing member. position of said supporting member in said long 8. In a brake shoe grinding machine, a grind range adjustment and In part by tile rotatable ing tool,, an oscillating work holder member, a fine adjustment of said rotatable support rela pivot for said oscillating member mounted for tive to said supporting member. m movement toward and away from said tool, re 4. In a machine for forming an arcuate con leasable detent indexing means for locating said tour on a workpiece, a power operated tool for pivot at a different predetermined distance from removing material from the workpiece, a sup said tool for each standard size of brake shoe to porting member mounted for fast long range ad be treated, fast long range adjustment means justment toward and away from said tool, releas 10 for moving said pivot to said indexed positions, able-detent indexing means for locating Eaid sup fine adjustment means for moving said pivot a- porting member.at different predetermined dis short distance relative to each indexed position tances from said tool throughout said range, an to compensate for oversize brake drums, fast long oscillating work holder having a handle movable range adjusting means for moving said work to two operative positions relative to the work 20 holding member relative to said pivot, slow feed holder, a pivot for said oscillating work holder, means for said work holding member, a handle eccentric mounting means for said pivot on said movably mounted on said work holding member supporting member to adjust the position of the for oscillating said work holding member, and oscillating axis of said pivot toward and away means for imparting either fast adjustment or from said tool relative to the indexed position ::.3 slow feed to said work holding member by of said supporting member, fast adjustment manipulation of said handle in different posi means 'operable' by' said handle in one of said tions relative to said work holding member. operative positions for moving said work holder 9. A brake shoe grinding machine comprising 2-eictive to said pivot, and slow feed means for a base frame, a grinding wheel mounted on said said work bolder operable by said handle in its base frame, a supporting member mounted on other position. said base frame for long range fast sliding move 5. In a brake shoe grinding machine, a grind ment toward and away from said grinding wheel, ing tool, an oscillating work holder, a pivot for releasable detent means for indexing said sup said oscillating work holder, means for mount porting member to a plurality of different pre ing said pivot for long range fast sliding ad determined positions for standard sizes of brake justment toward and away from said tool, re drums, a pivot member mounted for rotative leasable detent indexing means for locating said adjustment on said supporting member and hav pivot at different predetermined distances from ing a pivot axis eccentric to the axis of said ro said tool for standard sizes of brake shoes with tative adjustment, index and scale markings on in the range of said fast adjustment, said mount lo said supporting member and pivot member desig ing means including fine adjustment means for nating radius oversize measurements of a brake moving said pivot a short distance relative to drum and shoe, an oscillating member mounted each indexed position, and a handle movably on said pivot for oscillation about said pivot axis, mounted on said work holder for oscillating a work holder mounted on said oscillating mem- said work holder, said handle having free longi hj ber for sliding adjustment toward and away tudinal movement in one position relative to the from said pivot, a handle on said work holder work holder for fast adjustment of said work for oscillating the work holder relative to said holder relative to said pivot, and slow feed means grinding wheel, a handle rest on said oscillating for said work holder operable by rotation of member, and screw feed means on said handle said handle in another position of the handle. 5U for imparting screw feed movement to said work 6. In a brake shoe grinding machine and the holder when the handle is rotated on said rest, like, a grinding tool, an oscillating member, a said handle being movable longitudinally for fast pivot for said oscillating member spaced from adjustment of the work holder when disengaged said grinding tool, a sliding work holder on said from said rest. oscillating member, a handle for oscillating said 55 10. In a grinding machine for different size member and holder, a pivotal connection be brake shoes of T-shaped cross section having an tween said handle and said work holder for arcuate rim portion and a fiat web portion, a work movement of the handle perpendicular to the holdng member comprising an oscillating arm, plane of oscillation of said member, a handle a fiat clamping surface on said arm to engage rest on said oscillating member having abutment qq only a- central portion of the web of the brake means to engage the handle, and screw feed shoe, a clump screw opposed to said surface for means on the handle operative on said work clamping a single point cn said web portion holder when the handle is engaged with said against said surface, a cross arm offset from said rest, said handle having fast longitudinal move clamping surface and extending laterally on ment with said work holder for coarse adjust G5 opposite sides of said clamping surface to engage ment of the work holder when the handle is not only two spaced points on the arcuate rim por engaged with said rest. tion of said shoe without engaging said web to 7. In a brake shoe grinding machine, a grind define a chord between said points perpendicular ing tool, a supporting member mounted for long to said arm so that the center of curvature of said range fast sliding adjustment toward and away 70 arcuate portion of the shoe will lie in the longi from said tool, releasable detent indexing means tudinal center line of said arm, and a pivotal sup far locating said supporting member at different port for said arm having its pivotal axis inter predetermined distances from said tool for stand secting said center line of the arm. ard sizes of brake shoes within the range of said 11. In a brake shoe grinding machine and the fast adjustment, an oscillating work holder, a 75 like having a grinding member and an oscillating 2,637,14S 11 12 work holder, a pivot for said work holder mounted a handle for oscillating said member and work lor fast long range adjustment toward and away holder mounted on a horizontal pivot on said from said grinding member, means supporting work holder, a handle rest on said oscillating said work holder cn said pivot for fast adjustment member having abutment means engageable with relative to said pivot to vary the radius of oscilla- 6 the handle to prevent sliding movement of said tion of a workpiece in said work holder, a handle handle, and screw feed means on said handle movably mounted on said work holder for oscil operative on said work holder when said handle lating said work holder and for making both of is engaged with said rest, said handle when en said fast adjustments, and screw feed means for gaged with said rest being operative to effect said said work holder on said handle, said handle hav- io long range fast adjustment of said vertical piyot ing one position relative to said work holder to and when disengaged from said rest being opera operate said screw feed means and adjust said tive to effect fast sliding adjustment of said work pivot and another position to make fast adjust holder. ment of said work holder. 12. A brake shoe grinding machine comprising 15 a grinding tool, an oscillating member, a support ROY E. WASLEY. References Cited to the file of this patent for said oscillating member having a vertical . UNITED STATES PATENTS pivot, means for mounting said support for long range fast adjustment of said Pivot toward and away from said tool, releasable detent indexing 20 means for locating EUid pivot at a plurality of different distances from said tool throughout said long adjustment range corresponding to radii of standard sizes of brake shoes, a short range fine adjustment means for moving said pivot relative 25 to each of said indexed positions to introduce a correction for slightly oversize brake drums, a Number 1,649,695 1,662,078 2,102,915 2,225,806 2,304,530 2,325,826 2,345,161 2,441,004 Name Date Higgins______ ------- Nov. 15, 1927 Severson_____ --------Mar. 13,1928 Rlshei_______ -------Dec. 21, 1937 Stone________ --------Dec. 24,1940 Bigelow --------- Dec. 8, 1942 Barrett -------- Aug. 3, 1943 Thomason_ ____ Mar. 28, 1944 Bieberich_____ sliding work holder on said oscillating member,