US2422220A - Diamond wheel dresser - Google Patents

Description

June 17, 1947. E. BROCKER DIAMOND WHEEL DRESSR y Filed Feb. 5, 1944 ELr June 17, 1947. E', BROCKER 2,422,220 I DIAMOND WHEEL DREssER l Filed Feb. 5, `1.9411; 2 Sheets-Sheet 2 5M INVENToR.

E E FM he@ Patented June 17,1947

DIAMOND WHEEL DnEssEn Emil Brooker, Van Dyke, Mich., assignor to Super Tool Company, Warren Township, Macomb County, Mich., a partnership Application February 3, 1944, Serial No. 520,914

1 Claim.

This invention relates to dressing devices and particularly to a motor driven dressing wheel and its adjustable support by which angularly disposed faces are dressed upon grinding wheels.

Difculty has been experienced in the past when attempting to dress the face of a diamond grinding Wheel at an angle other than at right angles to its plane of rotation. Since diamond impregnated grinding wheels are now being used extensively for grinding threads and other forms requiring a predetermined angular face on the wheel, no means has heretofore been provided for accurately dressing the impregnated Wheel in a simple operation.

The present invention embodies a dressing device having a base and a platform which are joined together by a pintle about which the platform may be adjusted at any angle relative to the base. The base is constructed of steel, or other magnetic material, so as to be supported on a magnetic table and is provided with apertures by which it may be bolted to tables or other types of grinding machines. The platform supports a cradle on which a motor is secured and a lead screw advances the cradle on the platform against i relative direction of rotation of the dressing wheel changes when the dressing wheel is swung from one to the other side of the central plane of the grinding wheel. The motor is preferably of the high speed type, operating at approximately 6,000

R. P. M. and developing substantially 1/e of a horsepower.

Clamping means are provided on the base by which the pintle is secured after the angular position of the platform has been adjusted. An index scale is provided on the wall of the pintle by which the angular position may be set or checked. The pintle is positioned near one end of the platform and base, ahead of the motor, so as to have the dressing wheel disposed approximately in line with the pintle axis.

Accordingly, the main objects of the present invention are: to provide a dressing device with a base by which it is attached to a table and with a platform having a pivotal connection with the base, on which a motor is advanced and retracted; to join a. platform to a base by a pintle about which they are angularly adjusted and mount a motor for axial movement on the platform; to mount a motor for axial movement on thetop of a platform and provide a lead screw therebelow for moving the motor, all of which is supported by a pintle on a base which is attachable to atable of a grinding machine adjacent to the wheel to be dressed; and, in general, to provide a dressing device for dressing angular faces on a diamond impregnated grinding wheel, which is simple in construction, positive in operation and economical of manufacture.

Other objects and features of novelty of this invention will be specifically pointed out or will become apparent when referring, for a better understanding of the invention, to the following description taken in conjunction With the accompanying drawings, wherein:

Figure 1 is a perspective View of a dressing'device embodying features of this invention;

Fig. 2 is a broken sectional view of the structure illustrated in Fig. 1, taken along line 2-2 thereof;

Fig. 3 is a sectional view of the structure illustrated in Fig. 2, taken on the line 3-3 thereof;

Fig. 4 is a view of the structure illustrated in Fig. 2 as observed from the line 4 4 thereof; and,

Fig. 5 is a broken View of structure similar to that illustrated in Fig. 2, showing a modified for thereof. 1

The dressing device of the present invention embodies a base I0 which is made of magnetic material so as to be securable in fixed position, when mounted upon a magnetic chuck of a grinding machine table. The base is als/o provided with bolt receiving recesses I2 by which the device may be securely clamped to non-magnetic tables of other types of machines. Threaded apertures Id are also provided in the base by which the base may be secured to tables of still other types of machines having bolts with vwhich the apertures are aligned.

The base has a pintle i6 secured thereto for angular adjustment thereon. The pintle is provided with trunnions I8 and 20, the latter of which projects within an aperture 22 of a-truncated conical plate 24, which mates within the truncated conicall aperture 25 at the forward end of the base IU. A pair of screws 28 clamp the pintle i5 to the plate 24 to provide frictional engagement therebetween. The trunnion I8 projects linto an aperture 30 of a platform 32 which is secured to the pintle by a plurality of screws 3ft. The platform is adjustable with the pintle on the base l0, the adjustment being set or checked acteristics outlined above,

by an index scale 36 on the pintle surface from v index marks 38 on the base. The scale may extend from to 90 and from 90 back to 0, so that the index marks 38 may be disposed on both sides of the base and at the front edge halfway therebetween. By constructing the scale in this manner, the setting may be read on either side or at the front of the device.

The platform has a gib 40 machined thereon and a second gib 42 is secured in position byra plurality of screws 44. The gibs encompass a dove tail base 46 on a carriage 48 on which .a motor 50 is secured by a plurality of screws not herein illustrated. The carriage supports .a pin 52 which is secured in position by ascrewli. The pin operates in a slot 56 extending through the platform 32. The end of Vthe pin has a projecting finger 53, brazed or otherwise secured thereto, which is made of extremely hard material to prevent wear. The pin projects within a helical slot 610 disposed in a cylinder E2, the ends of which are mounted in brackets 64 supported on the underside of the .platform 32 by the screw-s 65. A shaft 88 on `the cylinder 162 is journaled in the brackets 164 on the end of the platform opposite to that to which the pintie IE6 is attached. The shaft 8 is connected by a block 'I0 to an operating handle 12. When the handle is operated to rotate. the shaft 68, the helical slot 60 causes the projets tion '58 and pin 52 tomove axially of the cylinder 2 to thereby advance the carriage' 48 toward Athe end .of the platform to which the pintle I is attached.

The motor lis of conventional form, being of the reversible type and operating at approximately 6,000 R. P. M. when developing substantially gg of .a horsepower. Itis to be understood that nonreversing motors and Athose of higher and low-.er speeds and horsepower ratings may be employed in place .of the motor having the particular char- The motor v5l) comprises a casing T5, a stator and rotor (not shown) fromv which a shaft 18 extends from the forward end. The forward end of the casing is enclosed by a bracket 80 havhi-g a bearing supporting element 32 in 'the left-hand end for supporting a bearing 84 hear the end of the shaft 13. A pair of bearings a6 are mounted near the front end of the bracket for engaging a :dressing wheel-supporting shaft 88.

Collars 90 are mounted on the adjacent ends of the Vshafts I8 and 48f3. having on their adjacent faces a pair of projecting pins 92, Athe planes through thosepon each collar being olf-set 9.0o to each other. The pins project into .apertures in `a resilient disc '94 made of rubber, leather, or similar flexible material. The disc provides'universal connection between the two shafts and prevents vibration from being transferred from the motor to a grinding disc 9.5. The grinding disc 95 is supported on a shaft 96 which projects from the shaft `813 and is retained .in clamped .position by a screw 98. The bearings 86 are retained in spaced relation by a collar |00 and are maintained in forward position by a sp1-it washer H12. Thegpiatform has a U-shaped-slot 109 cut in its-top surface extending from the left hand end,

as viewed in Fig. 2, toward the pintle I8. A spring -III operate'swithin the slot 409 yone end being secured to a pin H2 projecting from the under surface vof theY dovetailed base l45,;the other .end being secured by a pin II3 which extends ,across the metal at the Vend of the slot. The tension in the spring urgesthe platform lIB'to the left, which movement is interrupted by the stop plate lI4 i secured by screw I I5 to the end of the platform 32.

A split tube II6 encompasses the cylinder 62 when the ends are supported in recesses I I1 provided in-the brackets 64. The projecting finger 58 extends in the slot in the tube in which it moves as the platform 48 is advanced or retracted.

Between the gib 42 and the dovetailed base 46 an adjusting shim II9 is provided fortaking up any wear which may occur between the gibs and the base. Screws I2I projecting through the `gib 42 adjust the position of the shim and after the adjustment has been made the screws are locked in adjusted position by the nuts |22.

A clamping screwy |23 is provided in .the base, which operates directly upon the plate 23, or through a brass plug, to prevent the marring of the truncated conical surface thereof, when securing the plate to the base when the platform` is adjusted. To prevent grinding particles .from falling into the movable parts of the device and causing unnecessary wear, a cover element I24 is secured to the platform 4B by the vscrews lI 25. The ele-ment extends over the top and sides of the platforms and therebeyond, to maintain the platform 32 covered when the platform 48 is in advanced position. y

When it is desired to dress a diam-ond impreg nated wheel of a grinding machine, the base I0 is first placed upon the table of the machine and securedl in predetermined position thereonfby suitable means which may be a magnetic chuck, bolts, screws, clamping bars, `or any other means suitable for retaining the base irmly secured to the table. The axis of the base is preferably dis posed parallel to Ythe direction of movement of the table so that the base ymay be oriented relative tothe grinding wheel and the dressing Wheel may be set off to a desirable angle by the use of the scale 35. After the device has been accurately set, the motor 5B and dressing wheel 94 are operatedY at high speed and the wheel of the grinding machine is rotated, the wheels at their point of engagement operating in opposite directions. The carriage of the machine is adjusted to bring the wheel into desired position and is advanced at an angle across the face to be dressed by the manipulation of the handle l2.Y After a face is dressed toa predetermined angle on one side of the wheel, the platform 32 is moved angularly on the Vbase to bring the wheel into position on the opposite side of the grinding wheel. The motor is reversed to have the wheels operating at their point of engagement in lopposite directions and the handle 12 is manipulated to pass the dressing wheel across the grinding wheel face.Y After the dressing operatiomthe device may be removed from the carriage by the simple expedient of in-V The bearings Yare spaced by a sleeve 134 through. c

which the shaft 11:21 extends. When the nut |53 is tightened the pressure is applied through the outer to the inner 'race-way' of Vthe bearing Y|28 throughV the sleeve |134. to the inner and cuter raceway of the bearing 129 to preload the bearings. The adjustment of the nut 132 retains the shaft I21 against longitudinal movement rela- 5 tive to the bearings. The universal drive connection through the rubber or like element 94 is provided between the motor shaft and the shaft |21.

What is claimed is:

A dressing device including, in combination, a motor, a support for said motor, a platform on the top of which said support is movable, means on the underside of said platform for moving said support, a spring for returning said platform to its initial position, a base, a pivot joining said base and platform forwardly of said motor, a shaft mounted forwardly of said motor and supported thereby, and a universal connector joining said shaft to said motor.

EMIL BROCKER.

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

Number UNITED STATES PATENTS Name Date Sunnen Jan. 26, 1943 Rennie Dec. 30, 1919 Oliver Apr. 1, 1930 Curtis May 31, 1938 Fisher Dec. 2, 1919 Bright Deo. .31, 1918 Warner July 12, 1910 Severson Mar. 13, 1928 Levesque Nov. 28, 1939 Bryant Jan. 14, 1919 Arms Aug. 16, 1932 FOREIGN PATENTS Country Date Great Britain Apr. 7, 1921

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