US2815017A

US2815017A - Grinding wheel dresser

Info

Publication number: US2815017A
Application number: US551682A
Authority: US
Inventors: Bordonaro Vincent
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-12-07
Filing date: 1955-12-07
Publication date: 1957-12-03
Anticipated expiration: 1974-12-03

Description

Dec. 3, 1957 v. BORDONARO 2,815,017

GRINDING WHEEL DRESSER Filed Dec. 7, 1955 s Sheets-Sheet 1 MUU @j 55 55 CED/3 4cm 3/ l 10 7'5'4 0 IN Z6 Z3 1 3 VENTOR 7 6 vi g i Bo mi 0 nan;

ATTORNEY Dec. 3, 1957 v. BORDONARO 2,815,017

GRINDING WHEEL DRESSER Filed Dec. 7, 1955 5 Sheets-Sheet 2 Dec.-3, 1957 v. BORDONARO 2,815,017

GRINDING WHEEL DRESSER Filed Dec. '7; 1955 3 Sheets-Sheet 3 ATTORNEY United States Patent GRINDING WHEEL DRESSER Vincent Bordonaro, Belleville, N. J.

Application December 7, 1955, Serial No. 551,682

11 Claims. (Cl. 125-11) This invention relates to a novel precision instrument or mechanism for dressing the periphery and a side or sides of a grinding wheel or disk.

More particularly, it is an object of the present invention to provide an instrument or mechanism for dressing uneven surfaces of a rotary grinder to any desired shape either straight, angular or curved.

A further object of the invention is to provide a mechanism or instrument of substantially universal utility in shaping and reshaping abrasive wheels to provide any desired peripheral angle or curvature either straight, concave or convex to enable the grinder or a peripheral part thereof to be utilized for grinding tools, dies and other articles with extreme accuracy.

Still a further object of the invention is to provide a mechanism the use of which will enable abrasive wheels to be used and reshaped for further use even after having been worn down to an extent where the wheel would normally be disposed of as worn-out, thereby effecting a substantial saving in replacement of grinding wheels due to use of the instrument.

A further object of the invention is to provide a precision instrument which may be set by a number of different means thus enabling use of the instrument by unskilled or partially skilled workers as well as by highly trained machinists.

Various other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawings, illustrating presently preferred embodiments thereof, and wherein:

Figure 1 is a top plan view of the wheel dresser;

Figure 2 is a side elevational view thereof, looking toward the left-hand side of the wheel dresser;

Figure 3 is a cross sectional view taken substantially along a plane as indicated by the line 3-3 of Figure 2;

Figure 4 is a longitudinal substantially central vertical sectional view of the wheel dresser, taken substantially along a plane as indicated by the line 4-4 of Figure 3;

Figure 5 is a fragmentary detailed rear elevational view of a part of the mechanism;

Figure 6 is a fragmentary top plan view of the rear end portion of the base of the wheel dresser;

Figure 7 is a fragmentary detailed horizontal sectional view on an enlarged scale, taken substantially along a plane as indicated by the line 77 of Figure 2;

Figure 8 is a fragmentary detailed vertical sectional View, taken substantially along a plane as indicated by the line 8-8of Figure 7;

Figure 9 is a fragmentary front elevational view of one part of the wheel dresser;

Figure 10 is a fragmentary top plan view of the wheel dresser shown in conjunction with a grinding Wheel being refinished thereby and illustrating different positions of the wheel dresser parts in full and dotted lines relative to the grinding wheel;

Figure 11 is a side elevational view, partly in vertical section, illustrating another form of diamond for use with thedresser;

2,815,017 Patented Dec. 3, 1 957 Figure 12 is a top plan view of the diamond as shown in Figure 11, and

Figure 13 is a fragmentary detailed horizontal sectional view, taken substantially along a plane as indicated by the line 13-13 of Figure 2.

Referring more specifically to the drawings, the novel wheel dresser in its entirety and comprising the invention is designated generally 15 and includes an elongated base 16 having a flat underside 17 which is adapted to rest upon a flat horizontal surface. The base 16 has a d0vetail shaped recess extending from end to end thereof, as seen at 18 in Figure 3, which opens through the top of the base 16. A gib 19 forms one side of the dovetail groove 18 and is secured in the base 16 by screw fastenings 20. The gib 19 is provided'with a transverse bore 21 intermediate of its ends to receive a plug 22, as seen in Figure 13, the inner face of which conforms in shape to the inner face of the gib 19. A clamping screw 23 is threaded inwardly through a side of the base 16 and has an inner end abutting the outer end of the plug 22. The groove 18 opens outwardly of the forward end of the base 16 and is closed at its rear end by an upstanding wall member 24 which is detachably fastened to the rear end of the base 16 by fastenings 25, as seen in Figure 5.

An elongated slide 26 is disposed on the top surface of the base 16 and has a dovetail shaped member27 secured to its underside and longitudinally thereof and which slidably engages in the dovetail groove 18. An unthreaded shank portion 28 and a collar 29 thereof are journalled in the upper portion of the wall 24 in an opening 30 of said wall, as seen in Figure 4. The shank 28 extends outwardly from the wall and has a turning knob 31 secured thereto by a pin 32. The knob 31 cooperates with the collar 29 to prevent the shank 28 from moving longitudinally of the base 16. A feed screw 33 extends inwardly from the inner side of the collar 29 and threadedly engages a threaded bore 34 which opens outwardly of the rear end of the slide 26. The forward. end of the slide 26 is provided with laterally spaced upstanding abutment members 35 each of which has a groove 36 to swingably accommodate an end of a bar forming an angle stop 37. Said inner ends of the angle stops 37 are pivotally mounted in the recesses 36 by clamping screws 38 which are adapted to be tightened for securing the angle stops 37 immovably relative to the abutments 35 and in various angularly adjusted positions. A plate 39 is mounted on the upper surface of the forward end of the slide 26 between the abutments 35, and the upper surface thereof is inscribed with degree markings and graduations, as seen at 40 in Figure 1, which extend from the concavely bowed inner or rear edge 41 of said plate 39. The lower end of a bushing 42 is secured, as by a press fit engagement, in an opening 43 of the slide 26 which is disposed adjacent to but spaced from the forward end of said slide and centrally with respect to the longitudinal axis of the slide and base. Said inner plate edge 41 is disposed concentrically with respect to the axis of the bushing 42. It will thus be seen that the slide 26 including the parts carried thereby is movable by rotation of the knob 31 relative to the base 16 only in a direction longitudinally of said base. i

A swivel base 44 has a forward end portion provided with a vertical bore 45 which fits turnably around the bushing 42. Said forward portion of the base 44 has a fiat underside 46 which is supported swivelly on the upper side of the forward portion of the slide 26. A bushing 47 turnably fits in the bushing 42 and has a flanged upper end 48 which is secured by fastenings 49 to the upper surface of the forward end of the base 44. Said base 44 has an upwardly facing shoulder 50 which is disposed concentrically around the opening 45 thereof and above and adjacent said bottom surface 46. A screw 51 is a threaded into the top of the slide 26 and a part of the head of said screw overlies a portion of the shoulder to detachably retain the base 44 swivelly on the slide 26. The base 44 is arcuately' grooved as seen at 52 in Figure 4 to accommodate the head of the screw 51 when said base is rotated about the axis of the bushing 42. The rear portion of the base 44 is provided with an elongated slot 53 which opens outwardly of the upper side thereof. A feed screw 54 is turnably disposed in the slot 53 and extends threadedly through a nut 55 which is disposed for movement in the slot 53 longitudinally of the base 44. The feed screw 54 has a shank portion 56 a forward part of which is nonslidably journalled in an opening 57 in the rear end of the base 44 and a rear end of which is disposed in and detachably secured to an elongated knob 58.

A slide 59 is mounted on the rear end portion of the base 44 and is slidably connected thereto by a dovetail connection 60, as seen in Figure 3, for sliding movement of the slide 59 only in a direction longitudinally of the base 44. The dovetail connection 60 includes a gib 61 and a clamping screw 62. The screw 62 is threaded laterally into the slide 59 from one side thereof against the outer side of the gib 61 so that by advancing the screw 62 the gib 61 will be advanced inwardly to clamp the slide 59 immovably to the base 44. The nut 55 has a projection 63, as seen in Figure 4, which extends upwardly into a downwardly opening recess 64 of the slide 59 and which receives a screw fastening 65 for securing the nut 55 to the slide 59. The swivel base 44 and slide 59 form a compound.

A disk or plate 66 is mounted on the upper side of the slide 59 and has a depending central boss 67 which is received in an upwardly opening recess 68 of the slide 59 and which partially overlies the head of the fastening 65. The plate 66 is secured on the slide 59 by a screw fastening 69 which extends downwardly through said plate and is anchored in the slide. A pin 70 engages aligned openings 71 of the plate 66 and slide 59 and can only be applied when said openings are in alignment, so as to correctly index the plate 66 and the structure supported thereby with respect to the longitudinal axis of the base 44.

An arch shaped supporting member 72 is mounted on and secured immovably to the plate 66. An elongated guide bar 73 of dovetail shape in cross section is secured crosswise to the upper side of the member 72 by screw fastenings 74. A cross slide 75 is slidably mounted on top of the arch member 72 and includes a downwardly opening recess 76 of dovetail cross section, partially formed by a gib 77. The cross slide 75 has a post 78 fixed to and rising perpendicularly therefrom and which terminates at its upper end in a sleeve 79. The axis of the sleeve 79 is disposed crosswise to the axis of the post 78 or in a horizontal plane. A tubular diamond holder 80 extends slidably through the sleeve 79 and a diamond nib 81 is adjustably secured in the holder 80 by a setscrew 82. The point or tip 83 of the diamond nib is disposed beyond a forward end of the holder 80 adjacent to which the setscrew 82 is mounted. A stem 84 is mounted in the other rear end of the holder 80 and has a conical end projecting therefrom and which terminates in a point 85 which is disposed in alignment with the axis of the holder 80. Said rear end of the holder 80 is defined by an annular flange 86 which functions in'cooperation with a fixed plug 87 which is secured in and projects outwardly from the sleeve 79.

A feed screw 88 is threaded crosswise through the post 78 below the sleeve 79 and has a relatively large disk shaped head- 89 at one end thereof which loosely engages selectively in one of a pair of downwardly opening transverse grooves 90 of the holder 80 and which are located adjacent said flanged rear end 86, as best seen in Figure 4.

As best illustrated in Figure 1, a key 91 is adjustably mounted radially in the sleeve 79 and has an inner end projecting into the sleeve bore and slidably engaging a longitudinal groove 92 of the holder 80 to prevent turning of said holder in the sleeve 79. As best seen in Figure 3, a stop or clamping member 93 fits slidably and turnably in a transverse recess 94 which opens outwardly of one side of the post 78 and which communicates with a part of the interior of the sleeve 79. A threaded stem 95 projects from the inner end of the clamping member 93 and threadedly engages a bore 96 of the post 78. Thus, by turning the member 93 in one direction, said member will be drawn inwardly of the post 78 and into clamping or wedging engagement with the holder 80 to prevent movement of said holder in the sleeve 79. By turning the member 93 in the opposite direction the holder 80 is released so that said holder and the diamond nib 81 may be moved longitudinally of the sleeve 79 by the rotation of the feed screw 88.

A rack 97 is secured by fastenings 98 to the outer side of one leg of the arch 72 with the teeth thereof facing upwardly and disposed parallel to the longitudinal axis of the dovetail element 73. A stub shaft 99 is detachably secured to and projects laterally from the cross slide 75 to provide a journal for a pinion 100 and a handwheel 101 which are integrally connected by a sleeve 102 and which parts are retained rotatably mounted on the stub shaft 99 by a fastening 103, with the pinion 100 disposed to mesh with the teeth of the rack 97. A cover 104 which is detachably supported on and carried by the slide 75, as best seen in Figures 1 and 2, protects the teeth of the pinion 100 and rack 97 from dirt and dust.

As best seen in Figures 3, 7 and 8, a bar 105 is secured to the upper side of the cross slide 75 and has a pair of upstanding transversely spaced ears 106 at one end thereof, one of which is provided with an outwardly projecting extension forming a latch keeper or detent 107. A pin 108 extends through the ears 106 and loosely through the intermediate portion of a lever 109 which is thus supported for vertical rocking movement and for limited sliding movement between the ears 106 toward and away from the keeper 107. The bar 105 is provided with an upstanding housing 111 which opens downwardly therethrough and which aligns with a vertical bore 110 of the slide 75. The housing 111 is spaced longitudinally from the ears 106 and has an elongated opening 111a in the side thereof facing toward said ears. A pin 112 is slidably disposed in the bore 110 and has an enlarged hollow head 113 which slidably and nonrotatably fits in the housing 111 and in which is loosely received an end 114 of the lever 109. The dovetail element 73 is provided with an upwardly opening recess 115 which registers with the bore 110, in one position of sliding movement of the slide 75 relative to the element 73 and in which position the lower end of pin 112 is receivable in the recess 115 to latch the slide 75 immovably to the element 73. A spring 116 is mounted in the upper part of the housing 111 and urges the pin 1 12 downwardly to engage in the recess 115 when the bore 110 moves into registration therewith. When the slide 75 is latched by the pin 112, as illustrated in Figures 3 and 8, said slide 75 is disposed so that the horizontal axis of the diamond nib 81 intersects the vertical axis of the bushings 42 and 47, for a purpose which will hereinafter be described. By pressing down on the other, outer end 117 of the lever 109, as illustrated in dotted lines in Figure 8, said lever will be rocked to substantially a horizontal position for elevating the pin 112 out of engagement with the recess 115 so that the slide 75 and parts carried thereby may be moved crosswise of the compound base 44 and slide 59 in either direction by rotation of the handwheel 101. Also, by displacing the lever end 117 laterally as illustrated in Figure 7, said end 117 can be engaged under the keeper 107 for maintaining the pin 112 in an elevated position so that unobstructed translational movement of the cross slide 75 and parts carried thereby may be accomplished. By merely displacing the lever end 117 back to its full line position of Figure 7, the parts will be disposed so that when the bore 110 moves into alignment with the recess 115 the pin 112 will be projected by the spring 116 into engagement with the recess 115 for automatically latching the cross slide immovable relative to the element 73, as previously described. The bar 105 and the parts associated therewith, except the lever end 117, are protected from dust and grit by a cover 118 which is mounted detachably on the cross slide 75.

Headed screws 119, as seen in Figures 2 and 5, are threaded into the sides of the base slide 26 adjacent the rear end thereof. Each of the screws 119 extends loosely through an end of a retaining bar 120, which bars are thus swingably supported on the screws. The bars 120 can be swung upwardly, as illustrated in Figures 2 and 5, against portions of the sides of the base 44 to retain said base and the parts supported thereon against swinging movement about the axis of the bushings 42 and 47. By loosening the screws 119 the retaining bars 120 can be swung downwardly and forwardly to permit the base 44 to be swung about the bushing 42 in either direction, utilizing the knob 58 as a handle. It will also be apparent that one of the retaining bars 120 may be maintained in an upright position while the other bar 120 is released and swung downwardly, in which case the compound may be swung back and forth in one direction only from its position of Figure 1 and wherein the longitudinal axis thereof is disposed in vertical alignment with the axis of the base 16.

A stop pin 121 is fixed to and extends upwardly from a forward portion of the base 44. An elongated gauge member 122 has a lower end portion 123 of circular cross section and tapered to conformably engage in a downwardly tapered bore 124 of the bushing 47. A pin 125 is fixed to and extends laterally from the gauge 122 above and adjacent its tapered end 123. When the gauge end 123 is positioned in the bore 124, the gauge is rotated clockwise as seen in Figure 1 until the pin 125 moves into engagement with the stop 121. When the gauge 122 is so disposed, a vertically disposed flat surface 126 of the upper portion of the gauge 122 will be disposed exactly crosswise of the longitudinal axis of the compound and of the diamond nib 81 and the longitudinal or vertical center 127 of the surface 126, as seen in Figure 1, will be exactly in alignment with the axis of the bushings 42 and 47. Thus, the gauge member 122 provides a very efficient and accurate means for setting the point 83 of the diamond nib relative to the axis of rotation of the parts forming the compound and by which the diamond is carried.

In utilizing the dresser 15 for dressing a grinding wheel, the base bottom surface 17 is placed upon a horizontal fiat supporting surface, not shown, of a worktable which is disposed beneath a grinding wheel, a portion of which is shown in Figure and designated generally 128. A driven shaft or arbor 129 of the wheel 128, which is disposed in a horizontal plane, is adjusted vertically until its axis is disposed at the same level as the axis of the diamond nib 81. This setting of the arbor 129 may be accurately accomplished by utilizing the point 85 to engage in the conically recessed end 130 of the arbor. The dresser is then positioned as seen in Figure 10 with its longitudinal axis disposed in alignment with the plane of the grinding wheel 128 and crosswise to the axis of the arbor 129. During the aforementioned procedure, the diamond setting gauge 122 is removed from the dresser and the bushings are covered and protected from grit and dust by a cover 131, as seen in dotted lines in Figure 2, which is detachably secured in place by a pair of retaining screws 132 which are threaded downwardly into the forward end of the slide 59.

With the dresser disposed as illustrated in Figure 10 relative to the wheel 128, the dresser is initially employed to dress the periphery of the wheel and at least an outer portion of one side thereof. The retaining bars 120 are secured in upwardly extending positions to prevent swinging movement of the base 44 and so that the diamond nib 81 will be maintained at exactly a right angle to the arbor 129 and with the axes of the diamond nib and arbor at the same level. The knob 58 is then turned in a direction to cause the slide 59 and the parts carried thereby to be advanced forwardly by the feed screw 54 and. nut 55 until the diamond point 83 contacts the periphery of the wheel 128. The latch pin 112 is then latched in a raised position by moving the lever 109 to its dotted line position of Figure 7 after which, while the wheel 128 is revolved, the handwheel 101 is manually turned in one direction and then the other for causing the diamond point 83 carried by the cross slide 75 to move back and forth across the wheel periphery to dress the periphery to a true flat surface. The cross slide is then relatched by the pin 112 after which one of the retaining bars 120 is released and swung downwardly so that the base 44 can be grasped by the handle 58 and swung through an arc of about the bushing 42 to its dotted line position of Figure 10, for example, in which position a portion of one vertical side wall of the base 44 is disposed in abutting engagement with a rearwardly facing surface 35a of one of the abutments 35, so that the longitudinal axis of the base 44 and the diamond nib 81 are then disposed parallel to the arbor 129 and substantially perpendicular to the sides of the wheel 128. The knob 58 is then turned, as previously described, to advance the diamond point 83 into engagement with the adjacent side of the wheel 128, since the knob 58 will have been previously turned for backing off the diamond nib 81 to enable the diamond point to clear the corner of the wheel periphery. The latch pin 112 is then released and with the wheel 128 revolving, the handwheel 101 is turned to cause the diamond point 83 to move back and forth radially in contact with a side of the wheel 128 to square said side with respect to the Wheel periphery. The side of the wheel will thus be dressed to the periphery and inwardly as far as desired. If in the subsequent shaping of the wheel periphery, portions of both sides of the wheel 128 are utilized, the other side or face of the wheel will be dressed in the same manner as previously described.

Assuming now that it is desired to set the dresser 15 to dress a convex radius of one-eighth of an inch on the wheel 128, the dresser 15 is returned to its position of Figures 1 and 2 and is latched in said position by the retaining bars and the pin 112. The cover 131 is then removed and the gauge 122 is applied and positioned as illustrated in Figures 1 to 3 and as previously described. The diamond nib 81 may then be accurately set for cutting the one-eighth inch convex radius in any one of three ways. This can be accomplished by placing a oneeighth inch conventional gauge block against the fiat surface 126, after which with the clamping member 93 loosened the screw 88 may be turned for advancing the holder 80 and diamond nib 81 until the gauge block has a slip fit engagement between the surface 126 and diamond point 83. The clamp 93 is then tightened to clamp the holder 80 and diamond nib 81 thus positioned. The diamond setting gauge 122 can then be removed after which the cover 131 is replaced and with one of the bars 120 released and swung downwardly, the compound may be swung about the axis of the bushing 42 between the full and dotted line positions thereof as seen in Figure 10 for grinding a one-eighth inch convex radius on one side edge of the periphery of the wheel 128. It will be understood that the angle stops 37 or at least one thereof is swung outwardly and forwardly whenever the compound is swingably moved, as seen in Figure 10.

A second way of accomplishing this same setting of the diamond nib 81 is by bringing the diamond point 83 up to engagement with the surface 126, after which the distance between the front surface of the plug 87 and the back surfaceof the flange 86 is measured with a micrometer. p The one-eighth or .125 inch is then added to this measurement after which with the clamp 93 loosened the screw 88 is turned to displace the holder 80 and diamond nib 81 away from the vertical face 126 until this measurement is obtained.

Another, third way of setting the diamond nib 81 is by bringing the diamond point 83 into contact with the vertical face 126. The zero graduation of a verm'er slide plate 134, as seen in Figure 2, is then positioned in alignment with the zero graduation of a double linear scale 135 located on one side of the base 44. The Vernier slide 134 is slidably carried by a side wall of the slide 59 and is connected thereto by a tongue and groove connection 136, as seen in Figure 3. The slide 134 is secured in its different adjusted positions by tightening the screws 137 whereby the bottom portion of a clamping plate 138 is drawn inwardly into clamping engagement with the slide 134. After the zero line of the Vernier of the slide 134 is aligned with the zero graduation of the scale 135, the diamond point 83 is backed away from the surface 126 by turning the knob 58 until a .125 inch reading is obtained utilizing the Vernier scale and the rear or righthand portion of the scale 135. It will be obvious that the last described form of setting the diamond point requires greaterskill than the first or second method. The first or simplest method can be performed with accuracy by an apprentice or a relatively unskilled worker.

The dresser may be set for cutting a one-eighth inch concave radius, for example, by bringing the diamond point up to the flat surface 126 after which the distance between the front side of the plug 87 and the rear side of the flange 86 is measured with a micrometer. The gauge 122 is then removed, after which one-eighth of an inch is subtracted from the micrometer reading or measurement. The feed screw 88 is then turned to advance the diamond nib forwardly until the measurement between the front surface of the plug 87 and the rear surface of the flange 86 corresponds to the new setting or reading of the micrometer. is advanced one-eighth of an inch past or forwardly of the axis of the bushing 42, so that the dresser will then cut a concave rather than a convex radius.

Again assuming that the diamond point has been set to a zero reading as previously described and that the gauge 122 has been removed, the vernier scale of the slide plate 134 is zeroized with respect to the scale 135, after which the knob 58 may be turned for advancing the compound until a reading of .125 inch is obtained with the Vernier scale and the forward or left-hand portions of the linear scale 135. For dressing a concave radius, a diamond nib 81a having a diamond point 83a is preferably substituted in the holder 80, as illustrated in Figure 11, for the diamond nib 81.

Assuming that it is additionally desired to dress the wheel periphery by swingably moving the compound through a 90 angle in addition to a convex or concave radius the diamond point is initially set in the same manner as previously described. The compound is then swung counterclockwise as seen in Figure 1 until an angular reading of is obtained utilizing the zero graduation of the scale-40 of the plate 39 and the angle scale 139 which is inscribed on the upper surface of the annular flange or shoulder and on the arcuate front face of the base 44, as seen in Figures 1 and 9. With the compound thus disposed at a 45 angle, the angle stop 37, toward which the compound is swung, is swung rearwardly and inwardly into engagement with a side wall of the base 44, after which the pivot screw 38 of said angle stop 37 is tightened for clamping the angle stop immovably relative to its abutment 35. The same procedure is then repeated for setting the other angle stop 37, after which the compound may be swung back and forth betweentheangle stops for dressing the periph yp the wheel 128 to a one-eighth inch convex radius. The

In this way, the point of the diamond compound is then held at a 45 angle with one side of its base 44 abutting one of the stops 37, after which the latch pin 112 is released and the cross slide 75 is actuated by turning the handwheel 101 to cause the diamond point to cut one side of the periphery of the wheel at an angle of 45 to the plane of the wheel. The same operation is then repeated with the base 44 engaging the other angle stop 37 so that 45 angles will thus be cut on both sides of the wheel 128.

As seen in Figure 2, one side of the base 16 is provided with a linear scale 1411 and the complementary side of the slide 26 has a zero graduation or marking 141 to be utilized with the scale 141). Additionally, the knob 31, by which the slide 26 and all of the parts disposed thereabove are moved longitudinally relative to the base 16, is provided with micrometer graduations 142 employed with a zero line 143, as seen in Figures 5 and 6, which is inscribed on the wall 24. Two complete revolutions of the knob 31 moves the slide 26 a tenth of an inch or a distance equal to the spacing between two adjacent graduations of the scale 140. Thus, utilizing the scale in combination with the micrometer scale 142, the slide 26 and parts supported thereabove may be accurately advanced to position the diamond point for cutting a concave radius at any desired depth in the periphery of the wheel 128.

From the foregoing it will be readily apparent that the dresser 15 readily adapts itself to any dressing operation or combination of dressing operations to be performed on a rotary grinding or abrasive wheel or disk. It is also to be understood that the adjustments described are merely intended to illustrate a few of the most common dressing operations performed.

Various modifications and changes are contemplated and may obviously be resorted to, without departing from the spirit or scope of the invention as hereinafter defined by the appended claims.

I claim as my invention:

l. A grinding wheel dresser comprising an elongated base defining the bottom portion of the dresser, a diamond holder constituting the top portion of the dresser, a diamond nib supported in said diamond holder and having the axis thereof disposed in a horizontal plane parallel to the plane of said base, a compound mounted on the base and supporting the diamond holder, means swivelly connecting the compound to the base for mounting said diamond nib for swinging movement in a horizontal plane about the axis of said swivel means, manually actuated means engaging said diamond holder for effecting a reciprocating movement of the holder and diamond nib toward and away from an extension of the axis of said swivel means for varying the spacing of the forward end or point of the diamond nib from said axis extension in a direction rearwardly with respect to the dresser for varying the convex radius of an are described by the diamond point when the compound is oscillated on the base, said compound including a swivel base connected to a forward portion of the dresser base by said swivel means, a slide supported on the swivel base behind said swivel means, and feed means connecting the slide and swivel base for moving said slide and diamond holder as a unit in a direction toward and away from the axis of said swivel means and whereby the diamond point is capable of being advanced in a forward direction across the axis of said swivel means to assume a position for describing a concave are when the compound is rotated about said swivel means, said swivel base being horizontally elongated, said swivel means engaging the swivel base adjacent a forward end thereof, and a cross slide mounted above and supported by the first mentioned slide for movement in a direction crosswise of the longitudinal axis of the compound base and diamond holder,'said diamond holder and diamond nib beingsupported-for movement with the cross slide sponding to the longitudinal axis of the compound, and

manually actuated means for releasably retaining said latch means in a released position to permit sliding movement of the cross slide relative to the compound.

2. A grinding wheel dresser as in claim 1, and manually actuated rack and pinion means for imparting translational motion to the cross slide in directions crosswise of the compound.

3. A grinding wheel dresser comprising an elongated base defining the bottom portion of the dresser, a diamond holder constituting the top portion of the dresser, a diamond nib supported in said diamond holder and having the axis thereof disposed in a horizontal plane parallel to the plane of said base, a compound mounted on the base and supporting the diamond holder, means swivelly connecting the compound to the base for mounting said diamond nib for swinging movement in a horizontal plane about the axis of said swivel means, manually actuated means engaging said diamond holder for efiecting a reciprocating movement of the holder and diamond nib toward and away from an extension of the axis of said swivel means for varying the spacing of the forward end or point of the diamond nib from said axis extension in a direction rearwardly with respect to the dresser for varying the convex radius of an are described by the diamond point when the compound is oscillated on the base, said swivel means having a centrally disposed upwardly opening socket, an elongated diamond setting gauge member having a lower end detachably fitting into the socket of said swivel means, said gauge member having an upper portion provided with a fiat surface disposed in a vertical plane and having a vertically extending central portion disposed in alignment with the axis of said swivel means and extending from below to above the level of the diamond nib axis, and means for orienting said flat surface relative to the compound whereby said surface is disposed at a right angle to the diamond nib axis and facing rearwardly toward the diamond point.

4. A grinding wheel dresser as in claim 3, said compound including a swivel base connected to a forward portion of the dresser base by said swivel means, a slide supported on the swivel base behind said swivel means, feed means connecting the slide and swivel base for moving the slide and diamond holder as a unit toward r and away from the axis of the swivel means and whereby the diamond point is capable of being advanced in a forward direction across the axis of said swivel means to assume a position for describing a concave are when the compound is rotated about said swivel means, and a linear scale associated with the swivel base and slide and functioning with said gauge member for accurately setting the diamond point at a predetermined distance from an extension of the axis of the swivel means.

5. A grinding wheel dresser as in claim 4, transversely spaced abutment members fixedly supported on the forward end of the dresser base and having coplanar rearwardly facing surfaces disposed to be selectively engaged by side walls of the swivel base for positioning the longitudinal axis of the compound and diamond nib at a right angle to the longitudinal axis of the dresser base.

6. A grinding wheel dresser as in claim 5, said compounds being horizontally elongated, an angle stop member carried by each of said abutment members, means swingably connecting said angle stop members to said abutment members for swinging movement of the angle stop members in horizontal planes, said last mentioned means being manually adjustable for clamping said angle stop members immovably to the abutment members, and said dresser base and swivel base having graduations combining to form a degree scale for angulanly adjust- 1G ing the compound relative to the dresser base for setting said angle stops whereby the axis of said compound and diamond nib may be accurately maintained at a desired angle relative to the axis of the dresser base.

7. A. grinding wheel dresser as in claim 6, said dresser base comprising a bottom section and a top section constituting a slide and to which slide the swivel base is connected by said swivel means, tongue and groove means forming a dovetail connection between said dresser base sections for sliding movement of the upper slide section in directions longitudinally only with respect to the lower base section, and manually actuated feed screw means for moving the slide section of the dresser base and the parts supported thereabove longitudinally with respect to said bottom section of the base.

8. A grinding wheel dresser comprising an elongated base defining the bottom portion of the dresser, a diamond holder constituting the top portion of the dresser, a diamond nib supported in said diamond holder and having the axis thereof disposed in a horizontal plane parallel to the plane of said base, a compound mounted on the base and supporting the diamond holder, means swivelly connecting the compound to thebase for mounting said diamond nib for swinging movement in a horizontal plane about the axis of said swivel means, manually actuated means engaging said diamond holder for effecting a reciprocating movement of the holder and diamond nib toward and away from an extension of the axis of said swivel means for varying the spacing of the forward end or point of the diamond nib from said axis extension in a direction rearwardly with respect to the dresser for varying the convex radius of an are described by the diamond point when the compound is oscillated on the base, a cross slide interposed between said compound and diamond holder, and means slidably connecting the cross slide to the compound for movement of the cross slide, diamond holder and diamond nib in directions at right angles to the axis of the diamond, and spring projected latch means carried by the cross slide for automatically latching the cross slide immovable relative to the compound and with an extension of the axis of the diamond disposed to intersect an extension of the axis of said swivel means.

9. A grinding wheel dresser as in claim 8, and manually actuated means carried by the cross slide and engaging said rlatch means for moving and retaining the latch means in an inoperative position.

10. A grinding wheel dresser as in claim 9, a rack fixed to a part of said compound, and a manually actuated pinion rotatably supported on the cross slide and meshing with said rack for translationally moving the cross slide and diamond relative to the compound and in directions laterally thereof.

11. A grinding wheel dresser comprising an elongated base defining the bottom portion of the dresser, a diamond holder constituting the top portion of the dresser, a diamond nib supported in said diamond holder and having the axis thereof disposed in a horizontal plane parallel to the plane of said base, a compound mounted on the base and supporting the diamond holder, said compound including an elongated bottom section, means swivelly connecting the forward end of the bottom section of the compound to a forward end of the base for swinging movement of the diamond nib about the axis of said swivel means, said compound including slides interposed between said bottom section and diamond holder at right angles to one another, manually actuated feed means individual to said slides for selectively reciprocating the slides for moving the diamond holder in directions both crosswise and parallel to the axis of the diamond nib, said dresser base including a top section constituting a slide to which said bottom section of the compound is connected by said swivel means, and tongue and groove means mounting said top section of 1 l; the dresser base for sliding movement in directions longitudinally only relative to the axis of the dresser base for moving the compound as a unit in directions longitudinally of the dresser base.

References Cited in the file of this patent UNITED STATES PATENTS 1,994,386 Dardani Mar. 12, 1935