US2616228A - Buffing wheel - Google Patents

Description

NOV. 4, 1952 I c, SCHLEGEL 2,616,228

BUFFING WHEEL Filed Feb. 10, 1950 2 SHEETSSHEET 1 FIGJ.

CARL E .SCHLEGEL INVENTOR ATTORNEY Nov. 4, 1952 c, SCHLEGEL 2,616,228

BUFFING WHEEL Filed Feb. 10. 1950 2 SHEETS-SHEET 2 28 FIG. 3.

FIG. 4.

CARL F SCIzlLE'G'EL INVENTOR V r 7 BY M A '0 ATTORNEY Patented Nov. 4, 1952 2,616,228 BUFFING WHEEL Carl F. Schlegel, Brighton, N. Y., assignor to The Schlegel Manufacturing Company, Rochester, N. Y., a corporation of New York Application February 10, 1950, Serial No. 143,437,

3 Claims. (Cl. 51193) 1 The present invention relates to abrading and bufiing and more particularly to abrading and buffing wheels of the centrifugal air cooled type, and it has for a general object to provide a simple and. efficient wheel assembly of this nature embodying improved means for inducing the flow of a large volume of air into the wheel for cooling purposes.

A further object is to induce a free flow of such air radially therefrom through a plurality of renewable annular abrading or buffing units encircling the drum of the wheel and so arranged and constructed that they afford each other mutual assistance both in maintaining air passages between them and in holding themselves tightly clamped together against any relative movement.

Another object is to provide a form of individual bufling unit functioning as above that may be simply and economically manufactured and that will be convenient to handle both in applying it to the wheel and removing it therefrom when worn.

These and other desirable objects are accomplished by the construction disclosed as an illustrative embodiment of the invention in the following description and in the accompanying drawings forming a part hereof, in which:

Fig. l is an end view of an air cooled buning wheel constructed in accordance with and illustrating one embodiment of this invention; the

tion with the fabric units clamped in place, the

outerportions of the latter being broken away;

Fig. 4 is a side view of one of the binder rings for the fabric units taken alone and on a scale between those of Fig. 2 and Fig.3; and

Fig. 5 is a fragmentary section similar to Fig. 2 showing a modification of one of the air ducts in the wheel drum. 6

The same reference numerals throughout the several views indicate the same parts.

This general type of wheel is well known. The cooling is necessitated by the fact that it comprises a peripheral mass of fabric (usually cotton) either woven or knitted or otherwise suitably formed in laminations or cordage lengths, which mass is held radially taut by centrifugal action as it is rotated at high speed. As the work piece is thrust against it, frictional heat is generated that sometimes reaches a kindling temperature and charring might well otherwise result if such heat is not dissipated. An abrasive 2 is a fixed flange 22. is threaded peripherally and travelling on these paste (sometimes called grain) is applied iffan scription it will be assumed that such is the case and the device will be treated as a simple bufling wheel.

Referring more particularly to the drawings, and first to Figs. 1 and 2 thereof, 2 indicates a preferably cast metal drum having a multiplicity of radial holes 4 extending therethrough to produce a. foraminous central body of considerable capacity. On the interior, the ends are provided with seats 6 in which are fitted heads that include spider rings 8 secured by peripheral screws Ill. The spokes I2 of the spiders are in the form of fan vanes of a pitch which, upon rotation of the drum in the proper direction, will draw air from an axial direction into the interior of the drum and tend to build up a pressure in the latter. Centrifugal force so aided by this copious replenishment, will drive this body of air radially through the openings 4 in the drum and hence through the buffing fabric as will appear.

The heads 8-l2 include central hubs M which take the terminally threaded high speed spindle I6 with which the buffing wheel turns. The inner hub is tightened against a, collar [8 on the spindle by the screw action of the outer hub, internally threaded to engage a, threaded part of the spindle or arbor Hi, the whole being held against accidental loosening by a lock nut 20 on the threaded end of the spindle that locks against the outer hub.

On the inner end of the periphery of the drum The other or outer end threads is a clamping ring 24 provided with spanner wrench sockets 26 by which it may be turned and, in opposition to the flange 22, clamp or release the group of fabric buffer units shown in Figs. 1 and 3.

bulky mass of each unit is indicated in the drawings at 28. The fabric of each unit is annular in form and the units are identical. Embracing the inner or central edge of each is a. binder ring thereby firmly clamped against each other and the flange 22, and the wheel is ready for use.

However, the binder rings are not, except at distributed points, in intimate contact with each other nor with the outer confining elements, for a the outer faces of the side flanges of each binding ring are provided with a circular, preferably equally spaced arrangement of protuberances "36 intermediate their inner and outer overall diameters. These are preferably dome shaped and can be'formed out from the inside .of theyring- The units being identical and the binding rings identical these domes alternate with each other on adjacent units assembled on the drum and perform several functions.- First, they space the binder rings definitely from each other and thus establish annular slots and air passages for the escape of the air ,body in the drum through the holes 4, centrifugally, to bathe and cool the fabrics 28. Second, they prevent relative 'rotation of any unit on the drum 2 relatively to its adjacent mate and, thirdly, theoutside binder rings, through theirdomes 36, take contact with the drum flange .22 and the clamping ring 24 at such a high point above or, circumferentially outside-of, the connecting portions 34-of all the binders that the group .clamping tends to bend the flanges 32 thereof toward the .fabrics I28 and pinch them more securely within the binder. vIn furtherance of this purpose the free .edges .of the flanges 32 of each unit are bent inwardly toward each-other at38.

In the modification shown in Fig. 5, the vanes or fan blades .in the inner flange are omitted,

and instead the inner head 42 is cast' integral with the drum 2. Radial passages 44 pass through the fixed flange 46 directly into the interior'of the drum, so as to insure at all times a free flow of air into the fan end of the drum and out through the holes 44 and to avoid any dead air pocket in which ,any body of heated air might accumulate if, in any given situation, the radial flowof air through the bufisections is .less than desired.

The formation of the heads B--|,2 .as pieces separate from the drum 2 simplifies the molding operations when these and the drum are of cast metal. Aluminum is a convenient metal from which these parts may be cast. I

It is seen .from the foregoing disclosure that the :above mentioned objects of the .invention are admirably fulfilled. It :is to, be understood that the foregoing disclosure is given by way of illustrative example only, rather than by way of limitation, and that without departing from the invention, the details may be varied within the scope of the appended claims.

- What is claimed is:

A'bufling unit for bufling wheelsof thecentrifugal air cooled type embodying an annular body of fabric material, and a generally annular binder of sheet material embracing the central edges 0f the fabric, the said binder being U- shaped in cross section forming a connecting portion for contact with the drum of the wheel clear distance substantially greater than the dimension of each protuberance in a direction circumferentially of the wheel, so that the protuberance of one bufling unit may enter the space between two adjacent protuberances of the next adjacent 'bufiin-g :unit and still leave space for radial passage of :air between the two units.

2.-Abufiing unit in accordance with claim 1 in which the binder flanges are yieldable and the protuberances thereon are appreciably spaced radially from the connecting portion so that those on outside units of a plurality of units strung-on the *wheel will-take contact with clamping :rneans and tend to squeeze the contained :fabric-moreflrmly, 1 A -buffing wheel of the air cooled type, including a plurality of separate annular buffing units arranged in coaxial sideby-side relation to each other, and a drum extending through the central openings of all of said units and constitutingahub for mounting and supporting said uni-ts, said drum including a substantially cylindrical hollow body of relatively thick metal having a multiplicity of air passages extending radially therethrough and having an integral abutment flange extending radially outwardly at one end of said cylindrical body and having external screw threads for-med on said body at the opposite end thereof, said drum further including a nut threaded on said threads of said bod-y and tightened to clamp said annular bufling units between said ,nut and said abutment flange, and further including two heads extending radially inwardly from opposite ends of said cylindrical body to engage with and support said cylindrical body from a central shaft, at least one of said heads being formed with fan-like vane spokes with air inlet openings between the spokes so that upon rapid rotation of said cylindrical body and heads said vane spokes will tend 'to draw air into said cylindrical body through at least one of said heads and to expel the air through said radial air passages in said cylindrical body in position tocool said bufling units, each of said bufiing ,units including .an annular body formed mainly of fabric and a sheet metal binding ring of approximately U-sha-ped cross section extending around the inner circumference of said an nular "body in embracing and binding relation thereto, the "side walls of said binding ring :being formed with a circumferentially spaced series of lateral protuberances with the spacing gbetween ing .rings if-said huffing units.-

CARL F. son Leann.

(sameness on following page); Y

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Myers et a1 Mar. 17, 1936 Zucker Feb. 23, 1926 Zimmerman July 13, 1937 10 Number 6 Name Date White Dec. 21, 1937 Kreilick et a1. Jan. 25, 1938 Zimmerman Mar. 8, 1938 Levoy Nov. 15, 1938 Murray Dec. 13, 1938 White July 25, 1939 Hall Apr. 23, 1940 Seelenfreund Nov. 30, 1948

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