US2581411A - Buffing wheel - Google Patents

Description

Jan- 8, 9 2 F. E. HENDRICKSON 2,581,411

BUFFING WHEEL Filed May 14, 1947 WWW.

Patented Jan. 8, 1952 UNITED ines PATENT orncs BUFFIN G WHEEL Fritz E. Hendrickson, SeuthEl-gin, :IlL, assignor of :fiftyiper cent to Murray :Irelamd, Elgin, 111..

Application May 14, 1947.;fSerial'Nc. 748.085

elem-ms. (o1...si 19s- 1 "My invention relates to'buffing wheels-and to buffing wheel supporting structures;

An object of my inventionis to provide a new and novel construction for and "ofbuffing wheel's.

Another object of my invention is to provide a novel'supporti-ng structure for a bu fiir-ig wheel that shall be relatively inexpensive and comprise a minimum numbercf parts.

Another object of my'i-nvention'is-to provide abuffing wheel that shall maintain its hardness with decreasein theouter diameter due towear.

"Other objects of-"my invention will either be apparent from a description of "several terms of devices embodying my invention or will be :set outin the course of such description.

In t-he'--drawings,

Figure 1 isa view in side elevation o'i a boiling wheel embodying my invention.

Fig. 2 is a sectional view therethrough taken on the line -2-2 oi'Fig. 1,

3is an end view of a holding: lug,

Fig. 4 is a side view of the lug shown in Fig" .3,

Fig. 5 is a top plan view of a landing section shown in Fig. 6,

Fig. 6 is a fragmentary side view showing buffing sections mounted on a supporting and retaining disc.

Fig. '7 is a view in end elevation of one of the sections shown in Fig- 6,-

Fig. 8 is a side view of a modification of the parts shown in Fig. after folding over a retaining. lug of Fig. 4,

.Eig- 9" is an end view of the parts shown in Fig. 1D, and

Fig. 10is'a. top plan view of a'plurality of superposed plies shown in position before folding similarto thoseshown in Fig. 8.

Referring first of all to Figs. '1 and 2, I have there shown a boiling wheel embodying my invention and comprising a plurality of flexible sections 21, each section comprising a piurality 23 are folded over diametrally thereof and a'lug 25 is located at substantially the mid portion of said folded-over plies. The lugs are preferably made of solid material, such as metal, and may be thick.

Means for supporting said plurality of flexible sections in proper operativeposltion comprises a substantially central tubular member '21 having shoulders at each-end and adapted to be fitted on asupporti-ng and driving shaft 29. which shaft isadapted to be rotated at a speed such thatthe outer peripheral diameter of the sections 21" will travel at-a speed substantially of, sax-7,500 feet orover per minute.

On the hollowshait 2? I provide a pair of end discs 3"! having therein a plurality of openings '33 which openings extendin substantially a air-'- "cular'path'wi-thin and" close to the-outer'periplrery of discs 31. A plurality 'ofrods are fixed-in one of theend discs 31 as by having their outer ends head-ed or hammered over and they "are adapted to extend through the openings 3'3 in the other en'ddisc 31, that is, they extend axially of the bufiing wheel. The openings 33- in the two end discs are in register with each" 0th??? The number of openings 33 and rods i5 are such that the distances between two adjacent openings. and rods are substantially smaller than the over-all axial. length? of each of the "lugs 25, and the sections 2.1 are positioned substantially as shownin Fig. 6.. withthe lugs 25' extending substantially circumferentially. of. the end discs 31. Merely for: illustrative purposes I may mention that Imay use from 5. to 10 plies or thicknesses. 0i textile. material in each section 2'! and when the section 2|. together with its enclosed or en.- folded lug: 25,.ispositioned substantially as shown in Fig. .6. it will be retained in such. position and the action of centrifugal force upon. the outer portions of each of thev plies 21 will cause the individual thicknesses of material to extend. in substantially zigzag shape: peripherally of. the wheelwhich -.T.- havetriedtoshow in Fig. 5 of. the drawings. by numeral 3:1. The end. discs .3]. are adapted to be. held in fixed. predetermined position against the shoulders on: member 2-! by a nut: "which is adapted tohave screw-threaded engagement with: the outer; slightly reduced end of membr 27, a nut H: having: screw-threaded engagement with the outer end of shaft 2 9, holding member 2! and the parts mounted thereon on the shaft 29. I may here point out that member 21 is so designed and constructed that the hereinbefore mentioned fixed distance between the end discs 3| is provided by the interfitting of and discs 3| on member 21. I may here also point out that I may use one or more separating or spacing discs 43 between the end discs 3| and that a plurality of sections 2| are adapted to be supported by each adjacent pair of rods 35.

While I have shown nut 39 as engaging member 2! I may also screw it on shaft 29.

Referring now to Figs. 8, 9 and 10, I have there shown a means for maintaining the hardness of a buffing wheel substantially constant with a reduction in the external diameter of the wheel. I do this by positioning a plurality of substantially circular plies 23, one upon the other, the center of each of said circular discs being displaced along a substantially straight line as is indicated in Fig. 10 by the broken line 45. I may place an oval ply at one end of such a series in order to provide a better hardness of the wheel. A seam 47 is then used to maintain said eccentric position of the respective plies 23, and a lug 25 is located substantially centrally of the assembled eccentric plies 23, the longer length of lug 25 extending substantially parallel to the line 45 connecting the centers of the individual plies 23.

Fig. 8 shows the position of the outer end of each of the plies 23 and it will be noticed that a pair of plies 23 extend radially outwardly the farthest and that the other plies of each of the sections extend radially outwardly a smaller distance. When first starting up a new bufiing wheel embodying a plurality of plies 23 positioned eccentrically as shown in Figs. 9 and 10, the action of centrifugal force will be greatest upon those portions of plies 23 which extend outward the farthest. When these plies have been worn away another pair of plies of each section will then engage the-piece of work being polished so that astiffer or more rigid or harder buffing wheel body is provided. Substantially the same action takes place when the third and succeeding plies engage a piece of work so that this structure provides a means for maintaining the hardness of a buffing wheel substantially constant. Fig. 8 shows a modification comprising an extra long outer ply in addition to the circular outermost ply as shown in Fig. 9.

My invention provides a supporting Wheel for a plurality of sections of flexible textile plies, as well as a novel form of relatively inexpensive bufiing wheel. The supporting wheel comprises a plurality of rods or pins having one end fixed in an end disc, with the other end extending through a second and oppositely located end disc, said rods being positioned to hold the inner 1 or central portions of a plurality of sections of flexible textile plies by engagement with the inner or central portions of said plies, said plies being maintained in their proper operative positions with the major portions of each section extending substantially radially outwardly from the outer peripheral portions of said end discs.

While I have shown four sections as being supported by each pair of rods, I may mount only three sections along the same length of rod, which sections will be held between the end discs which are clamped tightly against the shoulders on member 21. This will provide much greater ventilation axially of the wheel.

4 The end discs 31 and 33 are imperforate and the cooling air is drawn in between the inner ends of each pair of sections, just outside of the outer periphery of the end discs.

I have found that noise can be reduced by sewing together the peripheral ends of two adjacent sections so as to reduce or prevent any air gap therebetween. This applies particularly to those composite buffing wheels having a small number of flexible sections. The seam should stop some distance from the end discs to permit of entry of air into the space between adjacent sections.

Various modifications may be made in the device embodying my invention without departing from the spirit and scope thereof and I desire that all such modifications coming clearly within the scope of the appended claims shall be considered a part of my invention.

I claim as my invention:

1. In combination ina composite bufilng wheel, a hub having means providing a radially extending throat, a folded bufiing section extending through the throat, the fold lying radially inward therefrom, and a rigid body lying in the fold supported thereby and movable therewith for enlarging said fold to prevent its passage outward through the throat to thereby retain said bufl'lng section on said hub.

2. The combination of claim 1 wherein said hub includes a pair of discs with spaced rods extending therebetween near the peripheries thereof to form section-supporting throats therebetween.

3. The combination of claim 2 wherein a plurality of said folded buiiing sections extend through the space between one pair of said rods and a rigid body lies in the fold of each section.

4. The combination of claim 3 wherein each said rigid body is elongated with the longitudinal axis thereof lying transverse the rods and trans verse the radial direction of the hub, and wherein there is included means for clamping said elements in the direction of said rods.

FRITZ E. HENDRICKSON.

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

UNITED STATES PATENTS Number Name Date 872,966 Painter Dec. 3, 1907 968,431 Stevens Aug. 23, 1910 2,015,646 Hillix Sept. 24, 1935 2,017,925 Siefen Oct. 22, 1935 2,168,871 Hague Aug. 8, 1939 2,226,624 MacFarland et a1. Dec. 31, 1940 2,280,399 Garling Apr. 21, 1942 2,309,553 Twyning et al Jan. 26, 1943 2,415,947 Hendrickson Feb. 18, 194;!

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