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Publication numberUS3263258 A
Publication typeGrant
Publication dateAug 2, 1966
Filing dateApr 1, 1965
Priority dateApr 1, 1965
Publication numberUS 3263258 A, US 3263258A, US-A-3263258, US3263258 A, US3263258A
InventorsDavid E Burge
Original AssigneeLever Brothers Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 3263258 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

D. E. BUR G E TOOTHBRUSH Aug. 2, 1966 Original Filed May 22, 1961 INVENTOR. DAVID E. BURGE United States Patent 2 Claims. (Cl. -167) This is a continuation of application Serial No. 111,839, filed May 22, 1961, for Toothbrush, now abandoned.

This invention relates, generally, to brushes and, more particularly, to a brush having a new and improved construction. While the novel construction characterizing the present invention applies particularly to toothbrushes, it applies also to many other kinds of brushes.

In the making of, for example, toothbrushes, the use of synthetic bristles is known, and such bristles are frequently though not always formed of nylon, a synthetic linear polyamide. The reference to nylon bristles in the description to follow is for the purpose of illustration, the invention not being limited to blushes having nylon bristles.

Manufacturers of nylon-bristle toothbrushes have provided, in the past, a variety of toothbrushes designated soft, medium, and hard to indicate the stiffness of the bristles. Usually it is the diameter of the individual bristles that determines the stiffness, the soft bristles having a diameter of nine (sometimes eight) thousandths of an inch (9 gauge), the medium bristles having a diameter of twelve thousandths of an inch (twelve gauge), and the hard bristles having a diameter of thirteen thousandths of an inch (thirteen gauge). For all bristles, there is generally a manufacturing or grading tolerance of about $0005 inch.

An object of the present invention is to provide a brush of new and improved construction.

Another object of the invention is to provide a brush of which each tuft has bristles of different characteristics.

A further object of the invention is toprovide a new and improved brush adapted to be used as a toothbrush.

A brush constructed in accordance with the principles of the present invention comprises a body portion having a plurality of tufts attached thereto at spaced-apart intervals. At least some of the tufts have a plurality of bristles of different characteristics-for example, different degrees of hardness or stiffness.

In a toothbrush constructed in accordance with the principles of the invention, there are two or more groups or classes of bristles in each tuft, the bristles of one class having a diameter different from the diameter of the bristles of the other class or classes, so that some of the bristles are harder than others. In some instances, there are three classes of bristles in each tuft. The arrangement of the bristles in each tuft may be either symmetrical or ran dom, and the various degrees of hardness may be obtained by means other than a variation of the diameters or crosssectional areas of the respective bristles, as will appear from the following detailed description.

A complete understanding of the invention may be obtained from the following detailed description of two structural arrangements constituting specific embodiments thereof, when taken in conjunction with the appended drawings, in which:

FIGURE 1 is a fragmentary view in perspective showing the bristles arranged symmetrically;

FIGURE 2 is a view similar to FIGURE 1 but showing the bristles arranged at random;

FIGURE 3 is a diagrammatic perspective view showing a toothbrush constructed in accordance with the principles of the invention; and

FIGURE 4 is a diagrammatic illustration showingthe operation of the toothbrush shown in FIGURE 3.

In FIGURE 1 of the drawings, the numeral ltlindicates, generally, a back or body portion of an adult-size toothbrush. The body portion 10 has any suitable configuration, and, although it may be formed of any suitablematerial such as metal, wood, rubber, or plastic, it is preferably formed of plastic.

A plurality of tufts 11 are mountedlon the body portion 10 by, for example, insertion of one end of each tuft into appropriately-spaced recesses or sockets 12.. Each of the tufts 11 is formed of any desirednumberof bristles. Usually, however, a toothbrush has approximately nine bristles in each tuft.

It is an important feature of the invention that the. bristles forming each tuft be of different characteristics. As shown in FIGURE 1 of the drawings, each tuft 11 is formed of a first plruality of soft nylon bristles 13, a

second plurality of medium nylon bristles14, and a third.

plurality of hard nylon bristles 15.

The soft bristles 13 are nine gauge (nine thousandths. of an inch in diameter). The medium bristles 1.4 are twelve gauge, and the hard bristles 15 are thirteen gauge. The tufts are substantially free of bristles having. a diameter departing fro-m the various nominal values by more than .0005 inch which represents a manufacturing or grading tolerance.

In the embodiment of theinvention shown in FIGURE 1, the bristles in each tuft are arranged symmetrically with.

respect to each other. For example, the hard bristles 15 are positioned in the center, and the bristles 13 and 14 are arranged alternately around the hard bristles 15.

In the embodiment of the invention shown in FIGURE 2, the bristles are arranged at random. The numerals 13, 14, and 15 designate in FIGURE 2 bristles identical to the ones respectively identified by those numerals in FIG- URE 1.

By combining the bristles as described above, the soft bristles 13 remove materials from the crevices between the teeth of a user and around the gums. The hard bristles support the soft bristles so that the latter do not bend away from the surfaces of the teeth and thus become unavailable to penetrate the crevices. At the same time, the hard bristles effectively polish the surfaces of the teeth.

A toothbrush having tufts of entirely hard bristles or medium bristles fails to penetrate certain of these crevices, since the tuft is larger than many crevices. A brush having entirely soft bristles likewise fails to penetrate certain of these crevices, because all of the bristles tend to bend under pressure.

As FIGURE 4 illustrates diagrammatically, the soft bristles 13 penetrate the crevices between the teeth while the medium bristles 14 and the hard bristles 15 stabilize the soft bristles against bending away as pressure is applied to the body portion 10. The medium bristles 14 and the hard bristles 15 effectively clean the surfaces of the teeth while the soft bristles are penetrating the crevices. Inasmuch as there are substantially no bristles having a diameter departing from the various nominal values by more than .0005 inch, there can be no impediment to the desired interaction between th various classes of bristles.

Since the soft, medium, and hard bristles are combined in the tufts, localized cleaning effects are obtained for each tooth. Since only a few tufts can come into contact with a single tooth at one time, it has been found to be a particular advantage to combine the various bristles described above in a single tuft rather than to provide for each tuft only bristles of a single class.

Another advantage of a toothbrush constructed in accordance with the principles of the invention is that the action of cleaning the teeth is quicker since the crevices are cleaned at the same time the teeth are brushed, elim- Patented August 2, 1966 inating the need for subsequent treatment of th crevices. Moreover, while the soft bristles penetrate the crevices, the hard and medium bristles not only clean the surfaces of the teeth but massage the gums.

If desired, each of the bristles 13, 14, and 15 may be of different colors to give aesthetic appeal.

Of course, the total number of the bristles 13, 14, and 15 in each tuft 11 is not limited to the number shown in the drawings. Where an eight-bristle tuft is desired, however, it is preferred that one of the medium bristles 14 be eliminated rather than a. hard or a soft bristle. Also, in some instances, a tuft of only two classes of bristles may be usedfor example, the hard and the soft bristles. For optimum results, however, it is preferred that a tuft have all three classes of bristles.

Some of the desirable results inherent in this invention may be obtained by various modifications of the exact configurations shown. v The scope of the invention is therefore limited only by the terms'of the appended claims.

I claim: i

1. A brush comprising a body portion and a plurality of tufts attached to said body portion, each of said tufts comprising a first, a second, and a third group of bristles, each bristle of said first group of bristles having a diamto said body portion, each of said tufts comprising a relatively-small-diameter class of bristles and a relativelydiffering from each other by at least .003 inch, and

eter' of approximately .009 inch, each bristle of said second group of bristles having a diameter of approximately .012 inch, and each bristle of said third group of bristles having a diameter of approximately 0.13 inch, said third group of bristles being positioned in the center of each tuft, and said first and second groups of bristles being alternately arranged around said third group of bristles.

2. A toothbrush comprising a body portion for insertion into the mouth of a user and a plurality of tufts attached each of said tufts being free of bristles having a diameter within the range of (a) said relatively small value plus .0005 inch to (b) said relatively large value less .0005 inch. I

References Cited by the Examiner UNITED STATES PATENTS 2/1942 Millard et al 15167 FOREIGN PATENTS 1,134,245 11/1956 France.

705,725 3/1954 Great Britain.

1,134,245 11/1956 France.

707,725 3/1954 Great Britain.

CHARLES A. WILLMUTH, Primary Examiner.

PETER FELDMAN, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2273717 *Jan 14, 1938Feb 17, 1942Lactona IncBrush
FR1134245A * Title not available
GB705725A * Title not available
GB707725A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3343551 *Dec 16, 1964Sep 26, 1967Anderson Douglas DMascara applicator
US3624667 *Apr 1, 1970Nov 30, 1971Indiana University FoundationToothbrush
US3668732 *May 8, 1970Jun 13, 1972Robert A LardenoisHair brush
US5114214 *Dec 13, 1988May 19, 1992Rolf BarmanProcess for producing tooth brushes and blanks for use for same
US5398367 *Dec 27, 1993Mar 21, 1995Lu; GuixianToothbrush with both soft and hard bristles
US5419001 *Mar 29, 1994May 30, 1995Wan; John C.Toothbrush
US5491865 *Jul 29, 1994Feb 20, 1996L'orealBrush for the application of nail varnish or a similar product
US5799353 *Nov 27, 1996Sep 1, 1998Sunstar Inc.Toothbrush
US5836033 *Aug 29, 1994Nov 17, 1998Berge; HaraldToothbrush for brushing teeth and massaging gums
US6086373 *Nov 10, 1998Jul 11, 2000Schiff; ThomasMethod of cleaning teeth with a toothbrush with improved cleaning and abrasion efficiency
US6096151 *Jun 5, 1998Aug 1, 2000E. I. Du Pont De Nemours And CompanyMethod and apparatus for making articles having bristles
US6138314 *Jul 24, 1997Oct 31, 2000Whitehill Oral Technologies, Inc.Toothbrush with improved cleaning and abrasion efficiency
US6269514 *Jun 5, 1998Aug 7, 2001Du PontMonofilament bristle assemblies and methods of making brushes using same
US6351868Dec 6, 1999Mar 5, 2002E.I. Dupont De Nemours & CompanyBristle sub-assemblies having parallel pairs of bristles; and methods
US6434778 *Nov 28, 2000Aug 20, 2002E. I. Du Pont De Nemours And CompanyMonofilament bristle assemblies and methods of making brushes using same
US6543083May 22, 2000Apr 8, 2003E. I. Du Pont De Nemours & Co.Bristles having varying stiffness
US6851153May 29, 2002Feb 8, 2005James P. LehmanToothbrush
US8448286Dec 18, 2009May 28, 2013Braun GmbhBristle tufts and toothbrush with bristle tufts
US20050125941 *Jun 29, 2004Jun 16, 2005Samsung Gwangju Electronics Co., Ltd.Dust agitator and vacuum cleaner having the same
DE4013564C1 *Apr 27, 1990Jul 11, 1991Fritz 7869 Schoenau De RuebTitle not available
EP0453954A1 *Apr 18, 1991Oct 30, 1991Frisetta GmbH KunststoffwerkeBrush with artificial bristles, in particular a toothbrush
EP2198744A1Dec 19, 2008Jun 23, 2010Braun GmbhBristle tuft and toothbrush with bristle tuft
U.S. Classification15/167.1
International ClassificationA46B9/04
Cooperative ClassificationA46B9/04
European ClassificationA46B9/04