US3187736A - Dressing mechanism for abrasive wheels - Google Patents

Description

June 8, 1965 E. ADAMCZYK DRESSING MECHANISM FOR ABRASIVE WHEELS Filed Nov. 17, 1961 xxxxx xx INVENTOR. EDWARD S. ADAMCZYK ATTORNEY.

3,187,736 DRESSING MECHANISM FOR ABRASWE WHEELS Edward S. Adamczyk, 47 Mazarin St., Indian Qrchard, Springfield, Mass. Filed Nov. 17, 1961, Ser. No. 153,119 1 Claim. ((11. 125-11) The present invention relates generally to new and useful improvements and structural refinements in a dressing mechanism and is directed more particularly to the pro- 'vision of a magnetized wheel dressing device and to an improvement in the means for moving in extremely fine increments a diamond point toward and away from the wheel of any one of a variety of types of grinding machines such as surface grinders, cutter grinders, and the like to be dressed.

It will be helpful to an understanding of my invention first to briefly consider some of the essential points and more important features and aspects thereof, so that same may be kept in mind during subsequent reading of the detailed description of the practical embodiment of my improvement and illustration thereof in the hereunto annexed drawing.

Without intending to place undue limitations upon the scope of the invention beyond what may be required by the state of the prior art, the particular embodiment may be briefly described as embracing the concept of a mag netized support means having a threaded tool carrier associated therewith and reciprocable relative thereto, with the support means having a pole reversing means whereby the tool carrier may be released from its engagement therewith.

It is here contemplated to provide an unthreaded, magnetized support, and a threaded tool carrier, the said tool carrier being held upon the said support by the magnetic force of the support, and being reciprocable relative thereto for the reason that the fine apex of each of the threads forms a thin helical rib which bears directly upon the support is subject to the magnetic pull thereof.

A typical type of grinding wheel dressing device in use at present comprises a simple bar member having United States Patent 3,187,735 Patented June 8, 1965 r not susceptible of long-life.

a diamond member fixedly positioned thereon so as to 1 project at right angles from one surface of the bar. However, under circumstances where it may be necessary to dress a grinding Wheel in the midst of a grinding operation, moving the wheel from its operative position into contact with the dressing tool presents the difliculty of restoring the grinding wheel to that same operative position. Assuming that only a very limited amount of additional grinding was necessary to complete the grinding operation, the operator would have to blue the surface and carefully restore the grinding wheel into the desired operative position to prevent the possibility of grinding the surface too much.

The common practice is to move the grinding wheel to the dressing tool, rather than vice versa. Some attempts have been made to devise grinding wheel dressing fixtures 'or tools wherein the dressing tool head which holds the dressing diamond, for example, is moved into engagement with the dressing wheel rather than vice Versa. However, these devices have been quite elaborate, complicated, and hence relatively expensive, thereby deterring wwide sale thereof.

The existing practices in the trade, as exemplified by the known prior art, contemplate the use of complicated jig and bracket structures for moving a dressing tool toward or away from the grinding wheel and such structures It may be given as a principal object of the present invention to provide a grinding wheel dressing device in which the holder for the dressing tool, such as a diamond tool member, is adjustably movable relative to a base member and is capable of being fixedly held in operative position when it has been moved into the desired relationship to the wheel it is to dress, while the base member is held attached for example to a magnetic chuck of a surface grinder, or the like. During operational use, minute adjustments of the tool may be made merely by a unique and novel rotation thereof relative to the base member.

The invention comprehends a particular construction, arrangement, combination and relationship of the various elements, components and instrumentalities of my dressing apparatus, useful with equal facility in the dressing of not only grinding wheels but also abrasive wheels and jig grinders of various constructions, all as exemplified in the following detailed disclosure wherein the objects hereof, as herein defined, will be apparent.

A further object hereof is to provide wheel dressing apparatus which will not necessitate the threading of the support means on which the threaded tool carrier will move, thereby materially reducing the cost of production thereof.

Another chief object is to construct apparatus of the general character indicated having means for permitting minute adjustment of the dressing tool relative to the wheel to be dressed.

Still another feature worthy of particular notice is that I provide means within the magnetized support means for reversing the polarity thereof whereby the dressing tool may be readily gripped thereto 'or released from engagement therewith.

The instrumentalities of the structure hereof which comprise the entire dressing device are relatively few in number, simple in construction, easily assembled, sturdy and desirable so as to provide long life, and may be manufactured at a cost to permit the sale thereof for substan tially less than adjustable dressing devices presently available on the market.

In the drawing:

FIG, 1 is a front elevational viewof an exemplary grinding wheel selected for purposes of illustrating a typical use of -a grinding wheel dressing device embodying the principles of the present invention. In this View, the side of the wheel is being dressed;

FIG. 2 is a side elevational view of the wheel dressing device as viewed from the line 2-2 in FIG. 1; and

FIG. 3 is a top plan view of the wheel dressing device shown in FIG. 1.

With continued reference now to the drawing, which illustrates a typical and preferred embodiment of the invention for the purpose of disclosure and forms a part of this specification, I have shown a dressing mechanism used in the dressing of abrasive wheels, jig grinders and the like and comprising a magnetized support means, generally indicated by 10, fixed to a base B by any suitable means so as to be locatable in substantial adjacency to the grinding Wheel W, and having a threaded diamond carrier, generally indicated by 20, associated therewith.

It will be understood that for purposes of simplifying the illustration and description of the present invention,

an exemplary grinding wheel W, rotatably supported by is an arbor (not shown), has been selected for purposes of describing the details and function ofa dressing device embodying the present invention, it being understood that the invention may named with other types of grinders such as cutter grinders and the like.

Further, base B may comprise a magnetic chuck upon the upper or working surface of which the grinding wheel dressing device of the present invention may be positioned.

Said support means comprises a three part base member, 'a first part for example, being formed from a suitable casting of steel and iron so as to have forward and rearward vertically-extending walls 30 and 32 respectively with the rearward wall 32 being of greater height than the forward wall 30, and a pair of spaced and parallel side walls 34 and 36, each connecting between the adjacent side edges of said walls 30 and 32. A horizontally-extending upper wall 40 of the support means 10 extendsrforwardly from said rearward wall 32 between said side walls 34 and 36 and is connected at its forwardmost edge with an inclined wall 42 which connects at its lowermost edge to the top edge of said forward'wall 30.

A second part of said support means 10 comprehends a metallic plate 44 preferentially, though not obligatorily, made of brass or equivalent material and disposed between the forward wall 30 of said first part and a third part is in the form of a block of steel or iron 46 which is secured to the said first part by any suitable means.

7 The uppermost planar surface 48-of said block 46- is disposed in a plane below and parallel to the plane of said upper wall 40 of said first part and is alignable horizontally with or is coplanar with the uppermost planar surface 49 of the plate 44 and the lowermost edge of the inclined wall 42, as best shown in FIG. 2, so as to form with said inclined wall 42 a V surface for the support of a round shaft as will appear.

Said support means i permanently magnetized so as to be provided with the usual polarity and is provided with a generally horizontally-extending, reciprocable, pole-reversing shaft 50, knownas a push-button, extending through suitable and aligned openings extending therethrough between the forward and rearward walls thereof, and through the members 44 and 46, all substantially centrally thereof.

By the means of the push button, the magneticholding 7 power of the support means is controlled. As the button is pressed from the rear, it is ON and as it is pressed from the front it is OFF, the non-magnetic plate 44 serving to divide the two fields or separate, the poles on either side thereof wherefore the polarity may be reversed, all as is known.

The diamond carrier or dressing tool 20 willbe understood to comprise a cylindrical shank 70, which shank will be helically threaded and provided at one end with a knob-like enlargement 72 for manual engagement to facilitate the turning thereof.

Said shank 70 will be provided with a longitudinallyextending central opening therealong in which a dressing tool 74 will be slidably receivable and .releasably fixed as by a set-screw 76 or the like. The free outer end of the dressing tool 74 will carry the diamond 78 in known manner.

The diamond carrier 20 is positionable in the V surface recess defined by the inclined wall 42 and the upper coplanar surfaces of the members 44 and 46 so as to be extendable transversely of the support means, as shown in FIG. 1.

The magnetic field of the support means will exert sufficient force upon the diamond carrier so as to retain the latter in a nested position relative to the said V surface. V

The diamond carrier 20 is rotatable about its axis by the manual engagement of the knob 72 causing the dressing tool 74 and the diamond point 78 to be moved laterally toward or away from the abrasive wheel W.

The range of movement of the diamond carrier will be determined by the pitch of the threads whereby the tool carrier may be moved laterally in extremely minute increment wherefore a substantial range of different positions of the dressing tool relative to the grinding wheel are provided.-

The magnetic field set up by the support 10 will be of sufficient strength to retain the tool carrier thereon but will not be of such strength as to preclude the rotation and movement of the carrier relative thereto.

The inclined wall 42 and the coplanar upper walls 48 and 49 form bearing surfaces upon which the threads of the shank 70 of the tool carrier may ride. 2

In essence, the adjacent threads of the shank 70 form small pockets which do not-have contact with these bearing surfaces, the small apex of each thread being the only point of contact with the magnetized block.

Stated otherwise, the spiral thread on the shank 70 of the tool carrier forms a thin, continuous helical rib which is in contact with and subject to the magnetic force of the base, while the shank per se is not in contact with and is not subject, to as great a degree, to the said magnetic force.

This helical rib will preferentially be of extremely fine pitch, whereby upon rotation, the tool carrier may be moved toward or away from the wheel in minute increments.

When it is desired to move the carrier 20 laterally to the right, as in FIG. 1, the knob 72 is rotated in a clockwise direction, and when it is desired to move the carrier to the left, the knob 72 is rotated in a counterclockwise direction.

If it is desired to remove the carrier 20 from th support 10, the shaft 50 is pressed inwardly whereby the polarity of the support is reversed, thus neutralizing the magnetic field thereof, whereby the carrier may be removed therefrom.

' It will be understood that. the walls of the recess in the support means 10-are unthreaded and plane through- .mond carriers of various diameters, although this feature will in no way'affect the interaction between the diamond carrier and the support.

The V-notch may also be provided with a lip (not shown) adjacent the forward wall of the block 46 in order to eliminate any tendency of the diamond carrier to rock relative to the support.

It will also be understood that the support means 10 may be placed at various angles relative to the grinding wheel, as maybe desired.

I therefore particularly point out and distinctly claim as my invention:

In a means for dressing grinding wheels, a magnetized dressing tool carrier support and a dressing tool carrier disposed thereon, said dressing tool carrier comprising a shank carrying a continuous radially outwardly extending helical rib, said shank having a turning knob at one end thereof and carrying a diamond point at the opposite end thereof, said support being provided with a transversely-extending recess the walls of which are plane throughout for the nesting of said tool carrier relative thereto, with said continuous helical rib being the only contact of said carrier with the walls of the recess and being subject to the magnetic force of said support with said tool carrier being movable laterally 5 6 relative to said support upon manual rotation of the 2,442,172 5/48 Klockars 125-11 turning knob of said tool carrier. 2,655,910 10/53 Grow 125-11 I. SPENCER OVERHOLSER, Primary Examiner.

5 FRANK H. BRONAUGH, JOHN C. CHRISTIE,

Examiners.

References Cited by the Examiner UNITED STATES PATENTS 1,966,127 7/34 Le Tarte. 2,337,249 12/43 Koller 125-11

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