US1890481A - Dressing tool - Google Patents

Description

M. J. WALSH DRESSING TOOL Dec. 13, 1932.

Filed rh rn 25. 1931 Patented Dec. 13, 1932 UNITED STATES MATHEW J. WALSH, OF MILWAUKEE, WISCONSIN DRESSING TOOL Application filed April 25,

This invention pertains to tools for dress ing or refacing the surfaces of grinding or abraicling wheels, which through use have become uneven or glazed, and also to the method of manufacturing said tools.

The invention has primarily for its object to improve structures of the foregoing character, and more particularly such structures as disclosed in pending application Serial provision of a novel structure and design to materially increase the efficiency of such tools, and a simple, inexpensive method of manu- V facture for producing such structures at minimum cost. U

Incidental to the foregoing, a more specific object resides in the provision of a dressing tool in which the working portion of the Q tool comprises a flat coiled strip having W spaced outer peripheral prongs or teeth for engagement with the surface of an abraiding wheel.

A further object resides in the provision of a n vel method of forming the dressing element, comprising subjecting a fiat strip of metal to a pair of opposed dies to slit the material transversely and partially of its width, and thereafter coiling the strip edgewise over an annular mandrel to cause the slit outer periphery to spread, and provide spaced teeth.

A more specific object resides in accomplishing the foregoing slitting operation by running a flat strip of metal through a pair of opposed annular dies.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the novel-coir struction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claim, it being understood that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claim.

In the accompanying drawing is illustrated one complete example of the physical embodiment of the present invention constructed according to the best mode so far devised No. 521,937, filed March 12, 1930, by the 1931. Serial No. 53a 7so.

for thepractical application of the principles thereof. a i V "In the drawing, Figure 1' is a side elevation of one form of apparatus employed in practicing the present method of manufacturey Figure 2 is a plan elevation? of the strip of material after the same has been partially slit-transversely of its width 5- i I y t Figure 3 is a side elevation'of' the strip after the same has been coiled over -a ma'ndrel;and' g 1 Figure 4 is a front elevation of the finished dressing elementl Referring now more particularlyto the accompanying drawing, the numeral; 1 designates a flat strip of material from which the dressing element is to be formed. As shown PATENT-om in Figure 1,the"strip 1 is subjected to a pair t of opposed dies 2 which serve to form the slits 3 transvers'ely of the width of the strip, and terminating intermediate its longitudinal edges approximately centrally thereof. The apparatus illustrated for forming the slits 3 comprises a. pair of rotary dies. which cooperate to form'the slits. However, it isto be understood that the invention contemplates the use of any type or form of dies'capable of accomplishing the same result, although rotary dies are preferable, due to 'thefact that they are capable of greater capacity;

. After the material has been slit, as illustrated in Figures 1 and 2, the same is'coiled over an annular mandrel (not shown) of sub stantially the same diameter as the. hub 4. Obviously, any lead or pitch may be 'iven to the coils, depending "upon the thickness of the material used, andthe diameter of the coils. The smaller the lead, the greater clearance between the coils and also the greater number of prongs or teeth, as will be hereinafter described. V

In coiling the slotted strip over a. mandrel,

it will 'be quite apparent that the outer I scribed more in detail in the aforesaid pending application, and as indicated in Figure 3, it being understood that as the abraiding disc 6 is rotated, the dressing element held in engagement therewith will also be rotated, during which operation there is .a lateral shifting of the surface of engagement between the abraidingdiscand the prongs 5, during which action the prongs serve to cut-or dress the peripheral surface of the disc 6.

It is believed that the advantages of the present structure over that disclosed in the aforesaid pending application will be quite apparent, in that the spaced teeth provide spaced cutting edges for engagement withthe surface of the abraiding, disc, thus presenting a more effective cutting tool than where a continuousjcutting surface is'employed, as illustrated and described in the aforesaid application. I

It will alsobe readily seen that spaced teeth provide for ready clearance ofthe particles of abraiding material cut from the surface of the disc 6, thus allowing the tool to effectively clear itself and materially in- I crease the cutting action.

After the strip 1 has been coiled, as disclosed in Figures 3 and 4:, the same is mountso ed upon, and suitably secured tothe hub 4, for reception of a suitable forked handle (not 7 shown) to permit'free rotation of the dress which hub is providedwith end recesses 7 ing. element. a r

Thus,it will be seen that anextremelyisim- 7 pie, inexpensive, and highly efficient dressing elementhas been provided, and which because of the novel method of manufacture vcan be produced at a minimum cost and with great speed, only two operations beingrequired to form the same, namely, slitting the strip by means of (lies, andthereafter coiling the same over a mandrel by any suitable mechanism.

I claim: 7 7

A tool for refacing abraiding wheels comprising a hub, a fiat strip. wound spirally upon the periphery of saidv hub, and radially projecting teeth on the outer edge of the strip, said teeth having its edges bevelled in opposite directions .and provided with flat outer faces of substantially diamond shape. In testimonythat I claim the foregoing I I have hereunto set my hand at Milwaukee. in

the county of Milwaukee and State of Wisconsin. 7

MATHEWJ. WALSH.

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