US2593673A - Buffing wheel section - Google Patents

Description

April 22, 1952,

Filed. July 17, 1951 .E; W. HALL BUFFING' WHEEL SECTION 2 SHEETS-SHEET l A ril 22, 1952 E. w. HALL BUFFING WHEEL SECTION 2 SHEETS-SHEET 2 Filed July 17, 1951 Patented Apr. 22, 1952 UNITED STATES PATENT OFFICE BUFFING WHEEL SECTION Elisha W. Hall, S'cituate, Mass, Application July-17, 1951, Serial No. 237,172

(Cl..51.-e193) 2 Claims.

This invention. relates to bufling wheels and in particular to a so-called section adapted to be assembled on a spindle with other like sections to form a wheel of the desired length of face. The object of the invention is to provide in such a section inbuilt means whereby by virtue of the way in which. the sections are assembled, differ:

ent densities of the working face of the wheel may be obtained. For this purpose. obverse and reverse sides of the section at alocation inwardly of its periphery are provided with. bearing. parts which are difierentiallyformed on the sides respectively, so that when two. like. sides of two sectionsare presented. oneto the other, the central, planes of the two sections will be spaced by a determined. amount, whereas if unlike sides are presented one to the other, the spacing will be different; I have used the words obverse and reverse which, however, merely are a. convenient identification. of the two sides of the section, to avoid the. uncertainties of referring to; one and the other, but thewords are not otherwise significant.

The invention. will be well understood by reference to the following description taken in connection with the accompanying drawings, wherein:

Fig. 1 is a side elevation. of the section showing the obverse side;

Fig. 2- is a similar view showing the reverse side;

Fig. 3 is a fragmentary section in a radial plane showing the confronting sides when two like faces are apposed to each other;

Fig. 4 is a similar view showing two unlike faces apposed to each other; and

Fig. 5 is a diagrammatic view in side elevation to illustrate the differential positioning of parts on the obverse and reverse faces of the section.

Referring to the drawing there is there shown a bufling wheel section of known type, generally in the form of a thin cylindrical disc and comprising a relatively rigid centra1 portion including a hub In (Figs. 3 and 4) conveniently formed of chipboard, pierced at i2 to receive the spindle and encircled by an annular mass of abrading material I4, herein formed of a number of plies of fabric so arranged as to present ruffles or pleats at the periphery of the section. Side plates [6 of thin vulcanized fiber overlie the'sides of the hub and the inner portion of the abrading mass. These parts may be secured together by suitable adhesive. When a number of these sections are assembled side by side and clamped on a spindle, the clamping plates usually grip the assembly at theinner part of the buffing annulus. l4.. A section having a construction as sofar described is.

not new and it serves merely as an. illustration of one kind of section to which the invention. may

. be applied.

In the example of'the invention. show-n the ob.-

verse-face of thesection as seen. in. Fig. 1 is pro-. vided witha circular series of regularly spaced projections 2-2 and the reversefaceof the section asseen in Fig.- 2 with acircular series of regularly spaced projections 24-, the circle. through the centers ofthe projections 24. being. smaller than that through the centers of the projections 22 for reasons which will appear. I indicatecon- Ventionally inF-ig. 1 the color black on sideplates l6 of the obverse side, and in Fig. 2-,the. color red (suggestive of reverse) on the reverse side, further to distinguish arbitrarily the-twofaces. In practice moreover, thetwo sideplates It may actually be colored in contrasting colors for ready diiferentiation.

In the present example all the projections 22 are of the 'same size, as areall theprojections 24. The projections of the two sets are of similar form and the number of projections in the two sets is the same, although neither fact is important. The differentiation; for the purposes. of the invention between the two sets is attained by the difierence in their position radially from the axial center of the section.

The projections 22- and 24 are here shown as circular and more or less dome-shaped embossments formed by suitable dies when thesection is made under axial compression. When -soformed as hollow embossments, as herein, opposite the inner portion of the abrading mass l4,'a portion of the latter is pressed into the concavities of the embossed projections and forms an interlock resisting both radial and circumferential displacement and this mass of material supports the wall of the hollow projections against axial compression exerted thereon when the sections are clamped.

The sum of the circumferential widths of the projections 22, measured in a plane parallel the sideplate I6 on which they are based, but at a substantial distance outwardly therefrom, is greater than half a circumference. Thus when the projections 22 of two adjacent sections are apposed those of one section cannot pass freely between those of the other to bear'against the portion of the sides between their bases, but an endwise contact is provided for as illustrated-in Fig. 3, and consequently the central planes of the two sections are spaced relatively far apart.

In the first sentence of this paragraph the words measured in a plane parallel to the sides are used because in the case of dome-shaped projectlons the ends of the projections, if circumferentially disaligned might axially overlap to a slight degree, and even advantageously so, as a tendency to circumferential slip between the two sections would be resisted. No attempt has been made to show this in Fig. 3. In any event the contact is essentially end to end, whether the extreme ends of the projections abut, the projections of the two sections being on opposite sides of a dividing plane, or whether the ends slightly pass such a plane and the engagement is of the flanks of the projections, but of the outer portions of such flanks close to the ends of the projections.

The same considerations apply if like sides bearing the projections 24 are apposed one to another. Relative wide spacing is provided.

As illustrated in Fig. 5 the projected outlines of the projections 24, as shown in dotted lines, are entirely outside of the outlines of the projections 22. When unlike faces of twosections are apposed the projections 24 on the reverse side of one will bear essentially the same relation to the projections 22 on the obverse side of the other as do the dotted and full line parts in Fig. 5. The projections of the two sets may therefore overlap axially and the ends of each may extend to bear against the side of the apposed section on which the projections of that apposed section are based, as seen in Fig. 4. The central planes of the two sections are thus relatively closely spaced as contrasted with Fig. 3.

Here again, when the projections are domeshaped the bases of the projections 22 and 24 need not be completely disaligned axially provided clearance is provided permitting the overlapping described or the bearing might not be that of the tips of the projections on the sideplates, but of the flanks of the projections relatively close to the bases. For purposes of illustration and description it has been thought clearer to consider aligned. In general the invention contemplates that the differential positioning radially of the bearing surfaces provides, when like to like faces are apposed, for an endwise contact of the outer portions of the projections with resultant relatively wide "spaces and on the other hand, when unlike faces are apposed for an axial overlapping, complete or substantially so, with resultant relatively reduced spaces.

In assembling a wheel from these sections we may put unlike faces together throughout prothem as completely disducing a relatively dense periphery, or like faces throughout, producing a relatively soft periphery, or the spacing may be varied to provide a wheel with a relatively soft section which is sometimes desired.

I am aware that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive, as is in fact clear in several matters from the description itself. Reference is to be had to the appended claims to indicate those principles of the invention exemplified by the particular embodiment described and which I desire to secure by Letters Patent.

1. A buff section adapted for assembly on a spindle side by side with other like sections to form a bufi'ing wheel, said section comprising a relatively unyielding center and an annulus of buffing material encircling the periphery of the center and anchored thereto, the center having on its sides axially extending bearing elements, the radial location of which is different on the two. sides respectively thereby providing, when like sides of two sections are apposed, for substantially endwise contact of the elements with consequent relatively distant spacing of the control planes of the two sections and, when unlike sides are apposed, for axial overlapping of the elements with consequent relatively reduced spacing of'the central planes.

2. A buff section adapted for assembly on a spindle side by side with other like sections to form a buffing wheel, said section comprising a relatively unyielding center and an annulus of bufiing material encircling the periphery of the center and anchored thereto, the center having at each side a circular series of axially extending projections, the combined circumferential width of the projections in each series at least closely adjacent their crests being greater than half the circumference to provide, when like sides of two sections are apposed, for endwise contact between the projections with consequent relatively distant spacing of the central planes of the sections, the projections on the obverse side being radially displaced relative to those on the reverse side to provide, when unlike sides of two sections are apposed, for substantial axial over lapping of the projections of the two sets with consequent relatively reduced spacing of the central planes.

ELISI-IA W. HALL.

No references cited.

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