US2480877A - Rotary brush - Google Patents

Description

p 1949- R. o. PETERSON 2,480,877 v ROTARY BRUSH Filed Nov. 6, 1943 2 Shets-Sheet l I V a: bk? V W5 9 IN V EN TOR.

RUBEN O. PETERSON ATTORNEYS AM M9 Sept. 6, 1949.

R. O. PETERSON ROTARY BRUSH 2 Sheets-Sheet 2 Filed Nov. 6, 1943 INVENTOR.

RUBEN O.PETERSON ATTORNEYS Patented Sept. 6, 1949 umifso smses attics I 4'. Claims, 1

The present improvements, relatingv as indiscated' te' rotary brushes, 'hQSVBYmGPG particular regar-d to brushes ot the "-c'oilknot-o1: twisted! tai t type in which the" brush material :compi ises a series of tufts formed: by doubling and twisting a bundle-'01: stranded lemrsh' liq-ate;- riat, usually wire, such tufts being secured at the point where. doubled by being. passed through apertures in a suitable support such; as a dish in the case; ot arotary brush. One form at smzh twisted. tuittype of brush which has been eaten siv elymarketed is disclosedfin'P-aterttNo. 13933610 teG. E Galvm,..dated May 16,1924. wheibmhffl? lustrated' in this patent is specifically designed for use asa rotary brush composed ofen'e or men: disks from which the twisted tufts oi 'larushv mas terial extend radially; An adaptationoi the same construction tewhat is; the trade a; cup brush is shown in Patent Ne. ZlDGZBfl to F. J. Bickel et al., dated November-214*, 1:936:

One objection; which heretofaore beemencountered in, the use of. brushes of the? foregoing construction; whatever the type, has. been, the: We eves: wiping: or diggingaction of the endsotthe twisted tufitsi, -which constitute thebmshing: elemeats-- In other wor-ds, when a bundle of stranded brush material is formed iniie: a tuft mthe: manner described, above,- the outer ends of one-half of the strands: will obviously project m one direction and the other half in a substantially opposite: direction: Even; where suchends are not spread apart or' crimpcdas in the above cited Galvin: patent, this difference: in singularity piese'ntedxby' the outer ends: of the strands results in a markedliv di'fiei eht action on the: workpiece, the sides of the tufts that tend to dig: in td the work roducing a much harsher cutting etrcct and greatly iflcreas'in'g Wire breakage. In other words, as the brushis held in place against the" work-piece;.the'sicfe-.of the? tuft that tends to dig into" the work cuts a deep groove while the other side merely wi'p'es. or burni'shc the surface.

Ohe principal object of the. present inventionis to overcome this asymmetrical effect in brushes composed of. tufts made. from twisted bundles of wire, or' like stna'ndlsi i To. the. accomplishment of the, foregoingand related ends, said ihv-ention then" consists. ofthe ly pointed: out in the claims I annexed: drawings and; the: tol lowina' dascription set fiorthih detail one methods-midterm product; exemplifying my invention; dis

closed? plzocedma ahdf pir'oduct constituticig fiolfi eves, but 'cne'et Wantonsapplications of the time at. my

In sagid-anmaeddtamngs: r Fig 1'- isa sideelevatiom ot a circular secembedgina my present improvements, such sectiota suitable tea use in a: rotaty' brush either singly or insplurab assembly ;r

Else 1 a is asectionalcletai-Lonpl-a e a-=a 1; Fig; zisacenteal section} through a cupbrush the manner inw-hicl-i a; section as Figs lama} be adaptedf0]? use in this 3 is awoken: sectional! View ot a modified imam oi -such cup brush-s 4 and :5 nesaeetivety illustrate two other modifications in constsuction oisuchcup brush; Fig. 6iisa. View more. 013 less diagrammatic in character itlustnatina the actionon the work" gieceoi aiwisted tuft such 8181' is utilized in m; impmm= bs'ush assembly? Eig ,7..shows ea: axial section of a; modified cir-' cm the order at. that shown m Figs; 1 and 1a;

Fig. la isa elevationof a porliie-nof the 5 lmslsh GIQHIQG-E-EEQDBE in such modifiedtconstructing; and

aand were central sectional views of furthe: teams of cup brushes2 'ihe setaey' section illustrated in; Fig. L

55; cempsisesa, suiapeist -im the fom of a metal disk b te the elements; of particular in-- temstr hesewithi are: designed! to be attached. Each sagpont; may at ceumse take various forms de upon the: particular type ct brush! illvalued; and: in which the latter re Iilhese respectively formed of doubled and; handles (it parallel arranged; stranded brush material which will ordinarily w consistiot? wii'es dmwn ta -various de rec: f means hereinafteniullytdescpibedahdparticulah i v g S 0 aw i dcmrfdmg the charactei of the operatiomtalespenformed-bythebrush. The'di aimetei ofii'shchshflndles cs brushr materialfis such pthe" samefto he imsented; through the 3*- fie thet'dislt; whereupon: the bundle is lama ugmlitsetfi; aiid the two extending prin- In any case, i. e. as illustrated in the brush elements shown in the respective lower corners,

of Fig. 1, the bundles of re-bent twisted brush material which constitute the'brush elements are alternately twisted in opposite directions; In other words, the direction of twist is reversed in successive elements or tufts. the reversal in direction of twist in successive versely inclined or trailing strand ends. However, if the next succeeding element is oppositely twisted so that such strand ends will engage the work in opposite fashion to that just described, the cutting effect wil1 be balanced on both sides of the brush face and instead of having the out w of varying depth, a cut to of uniformdepth will be produced.

"'A brush section comprising a central supporting disk with radially disposed brush elements carried thereby substantially as illustrated in Fig. 1 may be readily adapted for use in a cup type brush as illustrated in Figs. 2 to 5 inc.

elements or tufts, the two sides of the completed brush section will present an approximately equal number of strand ends which project forwardly, i. e. in the direction in which the section may be rotated, and which project rearwardly'or in a direction reverse to'that'in which thestrand ends travel. In thismanner the action of-the two sides of the brush face may be rendered'sub stantially uniform and it is rendered po'ssible to control the harshness of the brush. When a very harsh brush is desired, even though it involves increased wire breakage, the tufts can be so coiled that one has the outside half in a'position to dig into the work while the adjacent tuft, being coiled in the reverse direction; has its other half tending to dig into the work, thus making the brush symmetrical with respect to its two sides. By varying the angle at-which the forwardly projecting strand ends incline to the body of the brush element or tuft, the angle of dig and thus the harshness of ,the'brus'h' can be controlled. The strand ends which incline in the opposite or wiping direction'serve to support the others as well as to produce a oomplementary light brushing effect.

In order to retain the radially extending brush element or tufts in circular alignment, as well as to laterally support the same adjacent their points of attachment to disk L'circular disks or plates 1 of somewhat larger diameter than said supporting disk I are attached to the respective sides of the latter. Said disks 1 have central apertures 8 corresponding with aperture 2 in said supporting disk, and except for their outer portions ("osoly contact the latter, the three disks being firmly secured together as b spot welding at points 9. The outer peripheral portions of disks 1 are formed with circular beads I?) which fit over the looped or re-bent inner ends of the brush elements 4, and with lips 'or flanges l l which are disposed so as to closely and more or less resiliently press against the sides of such elements just beyond their points of attachment to the central or supporting disk. Thecomplete brush section thus provided is adapted for use either individually where a brush of only rela tively narrow working face is required, or a series of such sections may be assembled side-by-side to provide a cylindrical brush of any desired longitudinal extent.

The action just described maybe better understood by reference to Fig. 6 which illustrates in an exaggerated manner the effect of a single brush element composed of twisted strands such as described above. As shown in such figure, the forwardly inclining strand ends 6 will cut into the work-piece W more deeply than the re- 'Inj 2 a single such supporting disk l5,

'withacorresponding series of twisted tufts [6 carried thereby, is utilized. Such disk in this cas'einstead of being flat is transversely curved so as to be concave in cross section, and is mounted between two annuli l1 and I8 of corresponding concave section. The inner edge of the outermost annulus I5 is formed with an. axially projecting flange IS, the inner edge of which is flared outwardly so as to engage the inner edge of the inner annulus I8. In order securely to clamp disk l5 which carries the brush elements between said annuli l1 and I8 a spacing ring 20 is interposed between the inner edges of said disk and the inner annulus, i. e. adjacent flange I 9 on the outer annulus.

- It will be observed that the upper edges or lips of the cupped annuli l1 and 18 extend into contact with the bases of the series of brush elements carried by disk It: so as to support such elements at'desired angle to the axis of the brush as a whole. Successive tufts [6, as in the case of the circular section illustrated in Fig. 1, will be twisted in reverse directions so that the strand ends thereof will incline oppositely as shown in the case of the tufts illustrated in the central portion of Fig. 2.

Fig. '3 illustrates another form of cup brush in which in addition to a-series of twisted brush elements or tufts "5 carried by a concave disk 15 a second series 2| of such elements carried by aring 22 is disposed inside the first so that the face of the brush will present two rows of twisted strand ends. The brush supporting disks or rings l5 and 22 are mounted in a holder of substantially the same construction as in Fig. 2 except that ring 22 takes the place of the inner annulus l8 and the spacing ring 23 is of slightly different form from spacing ring 20.

Figs. 4 and 5 illustrate a form of cup brush in which the twisted brush elements or tufts 25, one series of which is shown in Fig. 4 and a double series in Fig. 5, are supported so as to lie *in substantially parallel relation instead of at an angle to the axis of the brush as a whole. Except for the fact that the disks 26 and 27 which carry such brush elements are in both cases flat and that the outer annulus 28 is of somewhat different contour, the construction of thetwo forms of cup brush illustrated 'in Figs. 4 and 5 respectively is substantially the same as that illustrated in Fig. 3.

In the double cup brushes illustrated in Figs. 3 and 5, where two sets of twisted brush elements or tufts are utilized, the ring that carries the inner series of such elements may be regarded as the equivalent of the inner annulus in the simpler form of the brush in which a' single series of brush elements is utilized. In other words, such inner annulus merely becomes the supporting means for the inner series of brush elements. While the manner in which a cup brush is employed is different from that of the rotary brush illustrated in Fig. 1, the action of the twisted tufts of brush material will be the same in that the forwardly directed ends of the twisted strands tend to dig or bite into the work more than do the trailing strand ends.

This action is equalized and the brushing effect rendered symmetrical throughout the extent of the brush face just the same in the case of such cup brush as described above in connection with a rotary or cylindrical brush. Furthermore, the principle involved may obviously be applied to other types of brushes, even brushes having flat faces and designed for reciprocatory rather than rotative movement.

The modifications in construction illustrated in Figs, 7-9 inclusive involve the substitution of a simple ring for a disk with peripheral apertures as the tuft carrying element in the brush. Such substitution permits the tufts to be crowded more closely together so that more brush material can be employed in a, brush of given size. Accordingly the modification will be especially desirable in small annular or cup brushes.

As indicated in the general description of the drawings, the brush shown in Figs. 7 and 7a. is of circular type and in general similar to that shown in Figs. 1 and 1a. However, the twisted Y tufts 30 of brush material instead of being inserted through apertures in a supporting disk are passed around an annulus or ring member 3| preferably of circular cross section. Thus the bases of the tufts may be crowded into close contact with each other; in fact in the case of a brush of small diameter the tufts will be substantially in contact throughout their length.

The support for the annulus which thus carries the tufted brush material is likewise modified in the construction thus illustrated in Figs. 7 and 7a in that the opposed circular disks or plates 32 between which the brush element is clamped have their inner edges oppositely re-bent to form a hub 33 whereby the brush as a mounted on its arbor.

In the modified cup brushes illustrated in Figs. 8 and 9, two series of tufts 30 of brush material closely mounted on annuli 3| are utilized as in the construction just described. However, incidentally to placing such brush elements in the cup-shaped holder 34, the tufts instead of being radially disposed with respect to such annuli are turned at an angle to the plane of the latter. The concentric rows of tufts are held in place and further supported by an inner cone-shaped member 35 and a filler 36 of oppositely conical shape, these parts being secured together either by a flanged annular projection 31 rising from the base of cup member 34, as shown in Fig. 8, or by flange 40 integral with the filler 36, as il lustrated in Fig. 9, the base of the cup being simply brazed to such filler. In the latter case the bore of such filler may be threaded as dewhole may be sired to permit mounting of the brush directly onto a threaded arbor.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a brush, the combination of a. support and a plurality of twisted brushing elements carried thereby, such elements being aligned in the direction of their active movement in use, and certain of such elements being twisted in one direction and a substantially equal number of such elements substantially uniformly distributed in such alignment lbeing twisted in the opposite direction.

2. In a rotary brush, the combination of a support of generally circular form and a. plurality of twisted stranded tufts carried by said support in a circumferentially aligned series, certain of said tufts being twisted in one direction and a substantially equal number of such tufts substantially uniformly distributed in such series being twisted in the opposite direction.

3. In a rotary brush, the combination of a support of generally circular form and a plurality of twisted stranded tufts carried by said support in a circumferentially aligned series, alternate tufts in such series being twisted in opposite directions.

4. In a rotary brush, the combination of a support of generally circular form including a brush material retaining element adjacent the periphery thereof and a plurality of tufts of stranded brush material looped around said element in a circumferentially aligned series, and doubled back on themselves, and the doubled portions of each tuft being twisted upon each other, the direction of such twist being reversed in successive tufts, whereby widthwise symmetry of the brush face is attained and preserved as it is worn down in use.

RUBEN '0. PETERSON.

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

a 7 UNITED STATES PATENTS

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