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Publication numberUS2294480 A
Publication typeGrant
Publication dateSep 1, 1942
Filing dateFeb 5, 1941
Priority dateFeb 5, 1941
Publication numberUS 2294480 A, US 2294480A, US-A-2294480, US2294480 A, US2294480A
InventorsCharles R Rohweder, Walter S Rogers
Original AssigneeUnited Shoe Machinery Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Making brush strips
US 2294480 A
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Description  (OCR text may contain errors)

Sept. 1, 1942. c. R. ROHWEDER ET AL 2,294,480

MAKING BRUSH STRIPS Filed Feb. 5, 1941 I Patented Sept. 1, 1942 UNITED STATES PATENT OFFICE Rogers, Falmouth, Mass.,

Machinery Corporation,


assignors to United Flemington,

N. J a corporation of New Jersey Application February 5, 1941, Serial No. 377,536

4 Claims.

This invention relates to the formation of strips of brush material in which the bristles which will constitute the body of the brush are supported in a layer by means of a carrier strip adapted to be coiled or otherwise formed to make a brush of the desired shape.

Brush strips which, for example, are intended to be wound edgewise around a hub to form a cylindrical rotary brush have long been manufactured by using a narrow strip of cloth or paper as the carrier. The bristles, which may be true bristles derived from an animal or which may be so-called bristles formed of a vegetable fiber or the like, are spread in parallel positions to form a row with their butt ends overlying the carrier strip. Commonly, these bristles are then secured in place by stitching together this and another carrier strip laid on opposite sides of the layer of bristles with or without the help of an adhesive. One customary procedure is to coat the stitched cloth carrier strips with a Bakelite varnish before the assemblage is wound upon a hub to form a brush. After the strip has been made into a brush, it becomes necessary to evaporate the solvent and this operation is usually expedited by the application of heat. This must be done, however, at a sufiiciently moderate temperature so that the bristles are not injured by the heat and, as a consequence, the time involved is considerable, thus delaying production and increasing the cost of the brush.

We have discovered that this drying period may be eliminated and the stitching avoided, and the object of our invention is to provide a method of forming brush strips which will secure these results.

From one viewpoint, the invention consists in the substitution of thermoplastic material for the cloth or paper carrier strips which have previously been employed, and we have found that the bristles may be secured firmly upon such a carrier by fusing two such strips with a layer of bristles interposed, conveniently by means of the heat set up in a high-frequency electrostatic field in which the doubl carrier strip is positioned and preferably is held under pressure.

In order better to describe the invention from this and other aspects, we have illustrated certain steps of the method in the accompanying drawing, in which Fig. 1 shows a layer of bristles with their butt ends overlapping a carrier strip of thermoplastic material;

Fig. 2 shows the superposing of another carrier strip in register with the first;

Fig. 3 illustrates the application of heat by Fig. 5 illustrates the application of suitable end flanges to complete a brush.

One particular form of carrier strip which has been found highly desirable is a vinyl resin film having a thickness, for example, of approximately five-thousandths of an inch. This vinyl resin may be that known as Vinylite XYSG, which is manufactured by the Carbide and Carbon Chemicals Corporation, and which is a vinyl acetal. Such a film is transparent and slightly elastic and when the bristles are forced against it in the presence of heat they will adhere thereto, thereby avoiding the use of an adhesive the solvent of which must be later removed. When a series of bristles 10 which have been distributed in a thin layer in which they occupy approximately parallel positions, as in Fig. 1, have been laid upon a carrier strip l2 with the butt ends of the bristles overlapping a major portion of the Width of such a strip and preferably substantially normal thereto, another carrier strip M of suitable material is laid on top of this assemblage and a portion of the length of the two strips with the bristles interposed is placed between electrodes l6 and [8 where it may be subjected to pressure of the order of 100 pounds to the square inch and the carrier strips caused to fuse or weld by means of heat supplied by a highfrequency electrostatic field set up between these electrodes when the latter are supplied with high-frequency current from a suitable source.

such as an oscillator 2|], as illustrated in Fig. 3. The amount of power applied and the particular characteristics thereof depend both upon the nature of the material and its thickness. They are, however, not critical and the fusing of the two carrier strips to grip the interposed bristles may usually be accomplished in a few seconds after which the pressure may be promptly released and the strip allowed to 0001, which occurs within a very brief time. Having completed this treatment, an adjacent succeeding portion of the assembled strip and bristles will be gripped between the electrodes and the process repeated. One of these strips may be omitted, if desired, and the bristles pressed into or caused to adhere to the body of the strip as heat is supplied.

Such brush strips may be then utilized in a variety of fashions. One common manner is illustrated in Figs. 4 and 5 in which the brush strip S is wound edgewise upon a cylindrical hul;

22, the strip thus forming a helical coil with its adjacent layers in close lateral contact. Any suitable means may be utilized for attaching the ends of the strip to the hub, and the brush will then usually be completed by the application of end flanges 24 and 26 which may be held to the hub 22 by any suitable fastenings such as the screws 28.

If, in the preparation of the strips, it is found convenient, a thermoplastic cement may be utilized to hold the bristles temporarily in place, and this cement ordinarily will be applied to the bristle-contacting surfaces of the carrier strips. One particular thermoplastic cement which is known to activate readily in a high-frequency field is made by the Carbide and Carbon Chemicals Corporation and is designated as XL5041. This cement is said by them to be a solution of modified polyvinyl acetate resin in toluol.

If the nature of the bristles, for example, is such that an oily surface thereof renders prompt adhesion of the bristles to the carrier strips more diflicult, then it may be found desirable to precement the butt ends of the bristles by dipping them in a solution of such a cement as that just mentioned and allowing them to dry before they are distributed and placed upon the carrier strip.

Having thus described our invention, what We claim as new and desire to secure by Letters Patent of the United States is:

1. That method of preparing a strip of brush material which consists in bringing together a series of distributed, substantially parallel, bris-. tle-like elements and superposed carrier strips of relatively thin, normally non-tacky thermoplastic sheet material outside of the bristle-like elements, the length of said strip being substantially normal to the length of the bristles, said bristles having their butt ends overlapping a major portion of the width of the carrier strip, and applying a localized heat directly to successive portions of the assembled strip to fuse the carrier strips to one another thereby to grip th interposed bristles.

2. That method of preparing a strip of brush material which consists in distributing bristlelike elements in a thin layer with the elements in parallel relation and with the butt ends of such bristles overlapping a carrier strip of thermoplastic, resinous material, superposing another carrier strip of similar material, pressing said strips and the bristles together within a highfrequency electrostatic field thereby producing heat in the strips and welding them by the action of such a field.

3. That method of preparing a strip of brush material which consists in applying a thermoplastic, resinous cement to the butt ends of the bristle elements which are to be used, allowing the cement to dry to a non-tacky condition, distributing such butt ends in overlapping relation upon a carrier strip of thermoplastic, vinyl resin. film, pressing said bristles in position on such a carrier strip by electrodes, and applying a highfrequency current to said electrodes to set up an electrostatic field traversing the bristle strip to cause the bristles to adhere to the strip, shutting off the current, relieving such pressure, withdrawing the strip, and forming it into a brush,

4. That method of preparing a strip of brush material, for use upon a support, which consists in placing the butt ends of distributed bristle elements in oyerlapping relation upon a carrier strip of thermoplastic, synthetic-resin film having suificient mechanical strength to serve as a support for the bristles, bringing said bristle strip and a pair of electrodes into coacting relation, pressing said electrodes toward each other to bring together a portion of said strip and said bristles thereby to force the bristles against the strip, applying a high-frequency current to said electrodes to set up an electrostatic field traversing the bristle strip to cause the bristles to adhere to the strip, shutting off the current, relieving the pressure, bringing, another portion of said bristle-carrying strip and the electrodes into coacting relation, and repeating the process to form a brush strip which may be caused to assume the shape of said support.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2421432 *Oct 5, 1944Jun 3, 1947Phillips Festus BArtificial eyelash
US2442451 *Oct 26, 1944Jun 1, 1948Rca CorpHigh-frequency dielectric heating apparatus
US2472003 *May 10, 1945May 31, 1949Elliott CoMethod of making wire brushes
US2503552 *Mar 18, 1947Apr 11, 1950Joe M HasslerArtificial eyelash and apparatus for storing and curling it
US2504969 *Jul 6, 1946Apr 25, 1950Girdler CorpHigh-frequency apparatus having two work-engaging electrodes and one adjustable electrode
US2508908 *May 2, 1946May 23, 1950Enchelmaier William FManufacture of brush equipment
US2539690 *Jan 7, 1947Jan 30, 1951Us Rubber CoMethod of providing plastic sheets with inlaid stripes
US2565974 *May 8, 1948Aug 28, 1951Leete William CMethod of making round brushes
US2587792 *Aug 13, 1947Mar 4, 1952Sivers Carl Henric VonMethod for rounding the tips of bristles
US2634167 *Jul 14, 1949Apr 7, 1953Hewitt Robins IncMethod of making brushes
US2653056 *Dec 20, 1948Sep 22, 1953Modglin Company IncMethod of making brooms
US2664316 *Feb 5, 1948Dec 29, 1953Lambert CompanyMethod of making brushes
US2677632 *Dec 1, 1951May 4, 1954David Easton IrvingChenille yarns
US2697304 *Nov 7, 1949Dec 21, 1954Welch Audrey GAttachment of hair to doll heads
US2716462 *Oct 25, 1952Aug 30, 1955Brennan Joseph BReinforced acoustic diaphragms and method of making the same
US2984053 *Jul 14, 1951May 16, 1961Osborn Mfg CoBrush and brush material
US3216038 *Nov 1, 1963Nov 9, 1965Charna GouldSynthetic plastic broom bristles
US3255494 *Jul 20, 1964Jun 14, 1966Johnson & JohnsonMethod and apparatus for making applicator
US3425746 *Oct 16, 1967Feb 4, 1969Cohn Robert AProcess of manufacturing a synthetic bristle brush
US3500491 *Sep 13, 1968Mar 17, 1970Cohn Robert ABristle brush
US3533124 *Mar 8, 1967Oct 13, 1970C & P Plastics CorpWoven bristles for brushes
US4190480 *May 22, 1978Feb 26, 1980Ebert Edward AFiberglass carpet
US4325900 *Jul 3, 1980Apr 20, 1982Schlegel (Uk) LimitedManufacture of brushes
US4325902 *Jul 3, 1980Apr 20, 1982Schlegel (Uk) LimitedFeeding parallel synthetic bristles, fusing ends by heat or extruded plastic, slitting to produce two endless brushes
US4330349 *Oct 2, 1980May 18, 1982Xerox CorporationUsing a rotatable cylindrical mandrel
US4518452 *Nov 20, 1981May 21, 1985Hundebol Keld OMethod for producing a grinding- or polishing disc and a machine for this purpose
US4637173 *Jan 25, 1985Jan 20, 1987Udviklingscentret Hansen & Hundebol A/SRotating grinding or polishing disc
US5876535 *Jun 6, 1995Mar 2, 1999Moulavi; OuriMethod for aligning rug fringe and rug obtained thereby
DE902486C *Sep 13, 1951Jan 25, 1954Otto Zentraf O H GVerfahren zur Herstellung von Buersten mit synthetischem Material
DE1202750B *Jun 29, 1964Oct 14, 1965Ludwig BayerVerfahren und Vorrichtung zum Herstellen von Buerstenstreifen
EP0192477A2 *Feb 20, 1986Aug 27, 1986ROLLS-ROYCE plcBrush seals
U.S. Classification156/72, 156/274.8, 156/192, 156/308.2, 300/21, 264/DIG.460, 15/182, 132/53, 156/275.7, 156/274.4
International ClassificationA46D3/05
Cooperative ClassificationY10S264/46, A46D3/05
European ClassificationA46D3/05