US3221727A - Abrasive wheel dressing device - Google Patents

Description

Dec. 7, 1,965 P. J. PITCL ETAL BRASIVE WHEEL DRESSING DEVICE Filed May 3l, 1963 u 5N www, m, K N/ P cpm mTomr/L AL P. E m M J. Eu m am@ LE @MZ MA JK ,5, m H

United vStates Patent Office 3,221,727 Patented Dec. 7, 1965 Calif.

Filed May 31, 1963, Ser. No. 284,663 1` Claim. (Cl. 12S-11) This invention relates to a dresser device for an abrasive wheel grinder and more particularly to a manually operated device.

Manual techniques for dressing of abrasive stones and the like have for the most part been dangerous in practice, time consuming, and wasteful of materials. In many instances, the equipment employed in the manual methods has been hazardous to the operator. The results of manual dressing for the most part have been substandard.

It is a principal object of the invention to provide a simple device that may be used in the manual dressing of the surface of an abrasive grinding Wheel.

A still further object of the invention is` to provide a manually operated dresser that is safe to use and is economical of time and material.

The dresser of the invention comprises a guide frame having an elongated, slotted arm and support means for connecting the frame to the grinding device including means for orienting the dresser to hold the arm of the frame parallel to a grinding surface of the abrasive wheel being dressed. The dresser includes a tool holder which is movable along the arm and which adjustably holds a dressing tool with a working end of the tool reaching through the slot of the arm to the proximity of the grinding surface of the abrasive wheel.

Additional objects and advantages of the device of the invention will become clear in light of the following specification and drawing wherein:

FIG. 1 is a perspective view of an abrasive wheel grinder having two abrasive wheels with a frame of the dresser of the invention being mounted on the guard of each of the Wheels;

FIG. 2 is an enlarged, fragmentary, sectional view taken along line 2-2 of FIG. l;

FIG. 3 is a fragmentary. vertical, sectional view taken along line 3-3 of FIG. 2; and

FIG. 4 is a longitudinal, sectional view taken along line 4-4 of FIG. 3.

There is illustrated in FIG. 1 an abrasive grinder 10 comprising a centrally located electric motor 12 having a driving shaft supporting at its opposite ends abrasive grinding wheels 14 and 16. The abrasive wheels 14 and 16 are enclosed by conventional circular guards 18 and 20. The motor is controlled by a switch 22.

Each of the abrasive wheels 14 and 16, as illustrated in FIG. l, is supplied with a Wheel dresser 24 of the invention. The dresser 24 of the abrasive wheel 14 is incomplete in that it is not illustrated with a dressing tool holder and dressing tool. The dresser 24 includes a support means 26 which is attached to a grinding wheel guard 18 or 20. The support means 26 includes a support arm 28 and orienting means 30 for placing the support arm in a plane perpendicular to the major axis of the abrasive grinding wheels 14 and 16. The inner end of the support arm 26 is held to the guard 18 or 20 by a single bolt 31. Referring to FIG. 4, it will be seen that the inner face of the support arm 28 in the area of the bolt 31 is closely spaced to but does not contact the wall of the guard 20. This structure is designed to facilitate orienting of the dressing device with respect to the abrasive grinding wheel. More exactly speaking, the orienting means 30, in the particular embodiment illustrated, for placing the support arm 28 in a plane perpendicular to the major axis of the grinding wheel 16 comprises three levelling screws 32. The three levelling screws 32 are of a setscrew nature and are held within threaded holes, located about the bolt 31, at the inner end of the support arm 28. The levelling screws 32 have their inner ends abutting againstl the wall of the guard 20. By the proper adjustment of the three levelling screws 32, the support arm 28 may be placed in a plane perpendicular to the axis of rotation of the grinding Wheel 14 or 16.

The support arm 28 (see FIG. 4) at its outer end carries on one surface a transverse groove 38 in which there is iitted a connecting arm 40 of a dressing or guide frame 42. The guide frames 42 of the two grinding wheels 14 and 16 are mirror images, one being a left-hand frame and the other a right-hand frame. A bolt 44 holds the dressing frame 42 to the support arm 28. The connecting arm 40 is desirably slotted at 43 to provide for a measure of adjustment of the dressing frame 42 relative to the support arm 28.

The guide frame 42 is a one-piece casting and includes a slotted, first operative or guide arm 48 which is perpendicular to and integral with the connecting arm 40. The slotted irst arm 48 with the device in its installed position parallels the major axis of the grinding wheel 14 or 16. A slotted, second guide arm 50 is perpendicularly disposed to the first arm and parallels the connecting arm 40 of the dressing frame 42 and the face of the grinding Wheel 14 or 16. When the dresser 24 of the invention is installed, slot 49 of the first arm 48 extends across the Width or the thickness of the grinding wheel 14 or 16 and slot 51 of the second arm 50 extends inwardly from the perimeter of the respective grinding wheel as best seen in FIG. 2.

The outer faces of the two guide arms 48 and 50 are machined to provide ground Ways for a dressing tool holder 54. The dressing tool holder 54 may be used with either the leftor right-hand version of the frame 42. As best seen in FIG. 3, the dressing tool holder 54 includes a cylindrical, upper portion 56 which has an internally-threaded, central hole 58 along its axis, which hole receives the external threads of an elongated dressing tool 60. The inner end 62 of the dressing tool 60 is the working end of the tool and mounts a small industrial diamond 64. The outer end 66 of the tool 60 is knurled to provide a friction area to be grasped by the operator in threading the tool 60 towards and away from the grinding wheel 16. The upper, cylindrical portion 56 of the dressing tool holder 54 terminates in a hexagonal nut 68 which at its opposite sides is provided with downwardly extending guide-engaging flanges and 72. A liber gasket washer 69 positioned in a recess of the underside of the hexagonal nut 68 cleanses the threads of the tool 60. With the dressing tool holder 54 mounted on either of the two operative arms 48 and 50, the opposing flanges 70 and 72 slidably engage the machined edges 74 and 76 of the respective two arms, which longitudinal edges serve as the guide means for the tool. The machined undersurface of the tool holder 54 slidably engages the ways provided by the machined upper surfaces of the operative guide arms 48 and 50.

The wheel dresser of the invention may be used for either pedestal or bench grinders and is inexpensive and compact. The dresser of the invention may be mounted permanently yon the grinder guard, thus being always ready for instant use. The tool holder, depending upon which of the two operative arms 48 and 50 in which it is mounted, may be used for dressing the face or the side of the abrasive wheel. The tool holder is hand fed for any speed required to dress the wheel. With the use of the dresser of the invention, an abrasive wheel may be kept square and the corners sharp. There is a minimum of vibration experienced in the use of the dresser of the invention. The device is readily installed requiring only a drilled and tapped hole in the grinder housing for attaching support means 26. The three levelling screws 32 permit ready alignment of the dresser with respect to the abrasive wheel.

Although an exemplary embodiment of the invention has been disclosed herein for purposes of illustration, it will be understood that various changes, modifications, and substitutions may be incorporated in such embodiment without departing from the spirit of the invention as defined by the claim which follows.

We claim:

A manually operated grinding wheel dressing device, said device comprising:

a support arm for attachment to a grinding wheel guard, said support arm being attachable to the grinding wheel guard about a single site;

adjustable means for orienting the support arm with reference to the grinding Wheel guard to place said support arm in a plane perpendicular to the major axis of the grinding wheel, said orienting means being adjustable to move the support arm toward and away from the grinding Wheel guard about the site of attachment of said support arm to said grinding wheel guard and said orienting means including leveling screws threadedly held to said support arm with their inner ends abutting against the wall of the grinding wheel;

a dressing frame removably held to the support arm,

4 said frame having a slotted first arm paralleling when installed the major axis of the grinding wheel and a slotted second arm perpendicularly disposed to the first arm and paralleling the face of the grinding wheel with the slot of the first arm extending across the width of the grinding wheel and with the slot of the second arm extending inwardly from the perimeter of the grinding wheel; a dressing tool holder adapted to be slidably held to a single one of said first an-d said second arms of the dressing frame; and

a dressing tool threadedly held to the dressing tool holder with its major axis perpendicular to a surface of said single one of the two arms and with the working end of the tool reaching through the slot of the arm to the proximity of the grinding wheel.

References Cited by the Examiner UNITED STATES PATENTS 2,484,404 10/1949 Doerer 125--1l.l6 2,748,761 6/1956 Winegar 12S- 11.16 2,872,758 2/1959 Hoerst 125-11 X 2,934,057 4/1960 Weining 12S-11.16

FOREIGN PATENTS 573,895 4/1933 Germany.

HAROLD D. WHITEHEAD, Primary Examiner.

J. SPENCER OVERHOLSER, Examiner.

JOHN E. PEELE, IR., Assistant Examiner.

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