US3289235A

US3289235A - Rotary brush

Info

Publication number: US3289235A
Application number: US494688A
Authority: US
Inventors: Brooks E Nelson
Original assignee: Osborn Manufacturing Corp
Current assignee: Osborn Manufacturing Corp
Priority date: 1965-10-11
Filing date: 1965-10-11
Publication date: 1966-12-06
Anticipated expiration: 1983-12-06

Description

Deco fi, 1966 a. E. NELSON 3,28%,235

ROTARY BRUSH Filed Oct. ll, 1965 INVENTOR BROOKS E. ll/ELSO/V BY 0% M w m ATTORNEYS United States Patent 3,289,235 ROTARY BRUSH Brooks E. Nelson, Chagrin Falls, Ohio, assignor to The Osborn Manufacturing Company, Cleveland, Ohio, a corporation of Ohio Filed Oct. 11, 1965, Ser. No. 494,688 8 Claims. (Cl. 15-200) This application is a continuation-impart of my copending application Serial No. 424,542, filed January 11, 1965, Brush Construction.

This invention relates as indicated to a rotary brush, and more particularly to a novel cup brush whichv is inexpensive of manufacture but of high quality and long life.

It is old in the art to produce power driven rotary brushes including cup brushes in which the bristles have been preliminarily assembled into tufts, ordinarily by twisting together, and then inserted and secured in an appropriate hub or back. It is often difficult to secure a brush face of desired bristle density in this manner and also, when utilizing very hard stiff metal wires, for ex- 7 ample, as brush fill material, it is difficult to bend such wires either to form such twisted tufts or for securing in the brush back, at least without damage to the same. Exceptionally stiff or brittle brush fill material may fracture when sharply bent about a retaining member, and brushes manufactured in the usual manner normally require trimming of the finished brush face in order to obtain the desired uniformity.

It is accordingly an important object of this invention to provide a novel rotary brush wherein a plurality of brush bristle tufts are preliminarily assembled and secured by means of encircling bands or clips, without excessive flexing of the bristles, and the tufts thus produced are then inserted and retained within an appropriate holder or brush back.

Still another object is to provide a novel cup brush having superior characteristics in use and which is adapted for quick and inexpensive manufacture with semi-automatic machinery.

Other objects of the invention will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, said invention then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawing setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexed drawing:

FIG. 1 is an end view of a power driven rotary cup brush embodying the principles of the invention; and

FIG. 2 is a longitudinal section therethrough taken on the line 22 on FIG. 1 1

Referring now more particularly to said drawing, the preferred embodiment of the invention there illustrated comprises a cup brush having an integral steel body 1 having a central hub portion 2 with a central axial aperture 3 therethrough for mounting on an appropriate shaft or arbor of a power driven brushing lathe or the like. Such hub portion 2 may project slightly in one direction to form an axial boss as shown in FIG. 2 and the opposite end face of the steel body 1 may be hollowed out to provide a generally cup shaped recess 4. A circumferential portion of body 1 projects uniformly radially outwardly to provide a circumferential step or shoulder 5 against which the inner ends of the bristles of the respective tufts are adapted to be seated. A smaller circumferential ridge 6 is also provided adjacent the outer edge of cup 4, for a purpose to be explained below.

The brush fill material is provided in the form of a number of preformed brush bristle tufts, each of which comprises a bundle of bristles 7 which may be of crimped wire, for example. These tufts or bundles are individually clipped together by sheet metal clips or bands 8 which encircle the basal portions of the respective bundles.

These bands may be locally indented as at 9 to assist in tightly gripping the bundle of bristles. The bristles of each bundle are carefully cut to length so that a true normally fiat end face is afforded each tuft, and each tuft is substantially identical in size and shape, thus facilitating automatic feeding and handling of the tufts prior to and during assembly of the, finished brushes.

A plurality of these tufts are now assembled to the steel body 1 by seating the short protruding ends of the tufts against circumferential shelf or step 5 with the opposite ends of sheet metal sleeves 8 engaged snugly beneath circumferential ridge 6. A continuous sheet metal sleeve or cylindrical annulus 10 is then slipped over the assembly snugly to engage the outer surfaces of such bands or clips 8 and the lower edge portion 11 of such annulus is deformed or crimped inwardly to engage in a corresponding shallow circumferential recess 12 in the metal body, while the upper edge portion 13 is similarly deformed radially inwardly to overlie and engage the same edges of the clips or hands 8 which are secured beneath the circumferential ridge 6. It will thus be seen that the several components are securely locked together into a single unit without employment of screws, bolts, or other special attaching means and the resultant brush requires no further trimming or finishing operations to be performed thereon. If desired, an adhesive such as an opoxy cement may be applied to the surface of step 5 prior to seating of the bristle tufts thereon.

Cup brushes produced in the manner described above have several practical advantages. In the first place, by banding the individual bundles of brush material, the handling of such brush material during manufacture is much simplified, crimped wire bristle material being notoriously difiicult to manage when handled loose. The individual bands also permit shaping of the component bundles or tufts to desired contour, and in the example illustrated it will be noted that such tufts are desirably of somewhat elongated cross-section and may be slightly wider at the outer side face to compensate for the difference between the inner and outer circumference of the brush face in the finished tool.

While crimped wire brush fill material is suitable for employment in the brushes of the present invention as above described, it will nevertheless be appreciated that a wide variety of different brush fill materials may be utilized including hard straight plastic beaded wire (see Patent No. 3,090,061), plastic coated wire, Tampico fiber, and plastic monofilaments such as nylon and the like. In certain instances, particularly when utilizing relatively hard brittle brush bristle material, it may also be advantageous to impregnate the butt portions of the tufts which are encircled by the clamping bands or clips with a suitable elastomeric material such as foamed polyurethane.

The preferred form of the new cup brush of this invention accordingly comprises a generally cup-shaped body having a central axial aperture therethrough for mounting on a shaft or the like, such body having a circumferential radially outwardly projecting portion affording a continuous fiat shoulder against which the inner ends of the crimped wire bristle tufts are seated. The outer end portions of such tufts extend parallel to the axis of rotation of the body a substantial distance beyond the cupped end of the latter. Tuft confining and supporting means in the form of sheet metal bands, for example, grip the basal portions of the respective tufts and desirably shape each tuft to an elongated cross-section circumt r tiel of e h u aw ntheradia y 9. t r..129

of each tuft being wider than the radially inner portion thereof. The tufts engage each other closely circumferentially of the-brush for mutual support and to afford a circumferentially continuous, brush face. A circumferential radially outwardly projecting shallow ridge on the body spaced axially from such shoulder closely overlies and engages the outer ends of the tuft bands, and a generally cylindrical sheet metal sleeve encircles the body and tuft assembly and snugly engages the outer surface of such bands- The lower edge portion of the sleeve is radially inwardly deformed and received within a shallow circumferential groove in the body below the shoulder,

and the upper edge portion of the sleeve is radially inwardly deformed to overlie and engage the same edges of such bands which are secured beneath the circumferential ridge. The'sleeve is thus itself secured against axial displacement while holding the entire assembly locked together. l

It will be seen from the foregoing that a novel form of power driven rotary brush hasbeen provided which is not only adapted to high speed assembly and manufacture, with consequent reduction in cost, butfwhich is also superior in uniformity of fill, balance and brush face trim.

Other modes of applying the principle of the invention details described, provided the features stated in any'of the following claims or the equivalent of such be em- ,1

ployed. I

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

1. A rotary cup brush comprising a steel, generally cup-shaped body having a central axial'apertur'e therethrough for mounting on a shaft or the like, said body having a crcumferential radially outwardly projecting portion affording a continuous flat shoulder, a plurality of crimped wire bristle tufts arranged with their inner ends extending parallel to the axis of rotation of said body a substantial distance beyond the cupped end of the latter,

sheet metal bands respectively encircling and clamping seated against said shoulder and their outer end portions inner ends of the latter and shaping each tuft to an elongated cross-section circumferentially of said brush with the radially outer portion of each tuft being wider than the radially inner portion thereof, said tufts engaging each other closely circumferentially of the brush for mutual support and to afford a circumferentially continuous prove its grip on the corresponding bristle tuft, a circumferential radially outwardly projecting shallow ridge on said body spaced axially from said shoulder and closely overlying and engaging the outer ends of said bands, and

a generally cylindrical sheet metal sleeve encircling the" body and tuft assembly and snugly engaging the outer surfaces of said bands, the lower edge portion of said sleeve being radially inwardly deformed and received jwithin a shallow circumferential groove in said body below said shoulder, and the upper edge portion of ,said

1 sleeve being radially inwardly deformed to overlie and :engage the same edges of said bands which are secured beneath said circumferential ridge.

2. A rotary brush comprising a circular body having a central axial aperture therethrough' for mounting ona shaft or the like, said body having a circumferential ,radially outwardly projecting portion affording a contin- .uous shoulder, a plurality of bristle tufts arranged with their inner ends seated against said shoulder and their closely circumferentially of the brush for mutual supbrush face each said band being indented further to im port and to afford a circumferentiallycontinuous brush face, a circumferential radially outwardly projecting shallow ridge on said body spaced axially from said shoulder and closely overlying and engaging the outer ends of said tuft clamping means, and a generally cylindrical sleeve encircling the body and tuft assembly and snugly engaging the outer surfaces of said clamping means, the lower edge portion of said sleeve being radially inwardly deformed below said shoulder, and the upper edge portion of said sleeve being'radially inwardly deformed to overlie and engage the same edges of said clamping means which are secured beneath said circumferential ridge.

3. A rotary brush comprising a circular body adapted to be centrally mounted on a shaft or the like, said body having a circumferential radially outwardly projecting portion affording'a shoulder, aplurality of bristle tufts arranged with their inner ends seated against said shoulder and their outer ends extending parallel to the axis of rotation of said body beyond the end of the latter, clamping means respectively'encircling and clamping the basal portions of said individual tufts adjacent such inner ends of the latter, -a circumferential radially outwardly projecting shallow ridge on said body spaced axially from said shoulder and closely overlying and engaging the outer ends of said tuft clamping means, andretaining means encircling the body. and tuft assembly and snugly engaging the outer surfaces of said clamping means thereby to hold said tufts secured by said ridge and seated against said shoulder.

'4. The brush of claim 3,. wherein said retaining means is a generally cylindrical sleeve having its lower edge portion inwardly deformed and received into a groove in said body below said shoulder to assist in resisting axial displacement of said sleeve.

5. The brush of claim 3, wherein said retaining means is a generallycylindrical sleeve having its lower edge portion inwardly deformed and received into a groove insaid body below said-shoulder to assist in resisting axial displacement of said sleeve, and the upper edge portion of said sleeve is radially inwardly deformed to overlie and engage the same edges of said tuft clamping means which are secured beneath said circumferential ridge.

'6. The. brush of claim 3, wherein said tufts are of elongated cross-section circumferentially of the brush.

7. The. brush of claim 3, wherein the cross-section of each individual tuft is wider at the radially outer side of the brush face than at the radially inner side of the brush face.

. 8'. A rotary brush comprising a circular body adapted to be centrally mounted for rotation about its axis, a

radially outwardly projecting portion circumferentially of said body affording a shoulder, a plurality of tufts of brush References Cited by the Examiner UNITED STATES PATENTS 1,998,562 4/1935" Sturgis 15-180 XR 2,325,629 8/1943"Peterson 15-180 XR 2,771,922 11/1956 Gyllenberg 15 1s0 XR FOREIGN PATENTS 456,984 3/1928 Germany. 918,526 2/1963 Great Britain.

CHARLES A. WILLMUTH, Primary Examiner.

PETER FELDMAN, Assistant Examiner.

Claims

8. A ROTARY BRUSH COMPRISING A CIRCULAR BODY ADAPTED TO BE CENTRALLY MOUNTED FOR ROTATION ABOUT ITS AXIS, A RADIALLY OUTWARDLY PROJECTING PORTION CIRCUMFERENTIALLY OF SAID BODY AFFORDING A SHOULDER, A PLURALITY OF TUFTS OF BRUSH MATERIAL ARRANGED WITH THEIR INNER ENDS SEATED AGAINST SAID HOULDER AND THEIR OUTER ENDS EXTENDING PARALLEL TO SUCH AXIS BEYOND THE END OF SAID BODY, INDIVIDUAL TUFT CONFINING AND SUPPORTING MEANS GRIPPING THE BASAL PORTIONS OF SAID RESPECTIVE TUFTS, AND CONTINUOUS CIRCUMFERENTIAL RETAINING MEANS IN THE FORM OF A SEPARATE ENCIRCLING RING ENGAGING SAID CONFINING AND SUPPORTING MEANS TO HOLD SAID TUFTS FIRMLY SEATED AGAINST SAID SHOULDER IN USE.