US2450793A - Abrading element - Google Patents

Description

E. W. HALL ABRADING ELEMENT Oct. 5, 1948.

2 Sheets-Sheet 1 Filed llarch 14, 1945 Q mvm'on. Ezlsha WHaZZ E. W. HALL ABRADING ELEMENT 2 Sheets-Sheet 2 Filed March 14, 1945 mwsuma. 4 Elisha WIIa 11/,

' By M as.. V, M, W

Patented Oct. 5, 1948 UNITED STATES PATENT OFFICE ABRADING ELEMENT 7 Elisha W. Hall, Scituate, Mass.

Application March 14, 1945, Serial No. 582,623

This invention relates to abrading elements of the class wherein a ring-like disk, to be employed as a wheel section, comprises a plurality ofplies of sheet material such as cotton cloth, and is concerned with a novel and improved construction resulting in economy of material and avoidance of bulkiness toward the center of the wheel section. The invention will be understood by reference to the following description when taken in connection with the accompanying drawings, while its scope will be pointed out more particularly in the appended claims.

In the drawings:

Fig. 1 is an elevation of an abrading element embodying the invention;.

Fig. 2 is a plan of two strips of bias-cut cloth placed edge to edge in readiness to be wound on a drum;

Fig. 3 is an end elevation, illustrating the winding of the two strips on and about the drum;

Fig. 4 is a perspective view of the composite band comprising two relatively wide strips and a relatively narrow strip attached thereto by rows of stitches along the edges of the narrow strip;

Fig. 5 is a sectional view on an enlarged scale on line 5-5 of Fig. 4: and

Fig. 6 is a sectional view on an enlarged scale on line 6-6 of Fig. 1.

Referring to the drawings and to the embodiment of the invention illustrated therein by way of example, and having reference at first to Fig. 2 wherein there are shown two strips 8 of bias-cut cotton cloth, for example, disposed edge to edge, the first step is to wind these strips simultaneously on and about a drum l (see Fig. 3) to produce dual spirals of the desired number of turns or plies.

The resulting plural ply rings or annular bands I! are next secured together by attachment to a third and narrower band M which may be a narrow woven tape or a bias-cut strip of cotton cloth of sumciently width to overlie adjacent edges of the bands II. This step is conveniently performed by sewing the narrow band ll to the wide bands I! as by two rows of stitches l8 along the edges of the narrow band II and at opposite sides, respectively. oi the adjacent edges of the zivliie bands l2. thus completing the assembly (see Finally. the narrow strip I4 is folded (see Fig. 8) along a line between the two rows of stitches ll, thus bringing the plural-ply groups together as one group. This produces a ring-like disk which is comparatively flat and without bunchiness toward the center and yet without waste of material characterizing former methods in which 4 Claims. (Cl. 51-193) material is cut away to avoid bulkiness. Moreover, the outer edges come together to present a smooth cylindrical working surface which requires notrimming to prepare the same for use, thus resulting in further economy of material.

The resulting ring-like disk may be used as such to constitute a wheel section by being placed with others coaxially on a hub and between end plates to clamp the assembly, or the disk may be provided with its own individual hub l8 such "as a ring of molded adhesive plastic adhering to the inner raw edges of the plies 8 and to the fold of the band M. In either case, the assembly is compact and firm, and there are no losses of material such as characterize former constructions and methods of manufacture.

Having thus described one construction, what I claim is: p

1. In an abrading element, the combination of two bands, each comprising a plurality of plies, and a relatively narrow band of sheet material extending lengthwise of and overlapping adjacent margins of the first two bands and folded along a line lengthwise of said bands.

2. In an abrading element, the combination of two annular bands, each comprising a plurality of plies, a relatively narrow annular band of sheet material extending lengthwise of and overlapping adjacent margins of the first two bands, and two rows of stitches attaching said narrow band to the first two bands, saidnarrow band being folded between said rows of stitches.

3. In an abrading tool, the combination of two annular bands, each comprising a strip coiled upon itself and presenting a plurality of plies, a third annular band of sheet material narrower than the first two bands and folded lengthwise, and means uniting the third band with the first two bands.

4. In an abrading tool, the combination of two annular bands, each comprising a strip coiled upon itself and presenting a plurality of plies, a third annular band of sheet material narrower than the first two bands and folded lengthwise, the margins of the third band being disposed between the first two bands, and annular rows of stitches uniting said margins with adjacent margins of the first two bands.

ELISHA W. HALL.

aEmENcEs crrEn The following referencesare of record in the file of this patent:

UNITED STATES PATENTS Number 7 Name Date 2,034,576 Hall Mar. 17, 1936

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