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Publication numberUS2445657 A
Publication typeGrant
Publication dateJul 20, 1948
Filing dateMay 8, 1945
Priority dateMay 8, 1945
Publication numberUS 2445657 A, US 2445657A, US-A-2445657, US2445657 A, US2445657A
InventorsPaul G Bennett
Original AssigneePaul G Bennett
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 2445657 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

J y 0, 1948- P. G. BENNETT 2,445,557

TOOTHBRUSH Filed May 8, 1945 au 6.39am 17,

923 3;; M-W m/ dliiys Patented July 20, 1948 UNITED STATES PATENT OFFICE TOOTHBRUSH 7 Paul G. Bennett, Boston, Mass. Application May 8, 1945, Serial No.592,543 1 Claim. (01. -167) My invention relates to toothbrushes.

The invention has among its objects the provision of a toothbrush having a body the portion of which that carries the bristles or the like is resilient for operating on the teeth in an improved manner.

In the drawings:

Fig. 1 is a. plan of a toothbrush according to the invention;

Fig. 2 is an elevation of the toothbrush according to Fig. 1; and

Fig. 3 is a more or less diagrammatic illustration of the manner in which the toothbrush may be applied to the human mouth to operate on the inner and outer sides of the row of teeth.

Referring to the drawings, the body of the toothbrush comprises a rigid handle portion l and a resilient brush portion 2, the latter carrying the bristles 3 for forming a brush. As shown, the brush portion 2 is longitudinally curved so that the operating face afforded by the free ends of the bristles of the brush is normally concave longitudinally thereof.

The brush portion 2 of the body of the toothbrush is preferably made of resilient material, for example vulcanized rubber, and as shown is secured to the handle portion l of the body by the skived cemented joint indicated at 5. The construction of the portion 2 is such that when the brush is pressed against the outer side of a row of human teeth it may be readily flexed into a position of lesser curvature, for example as indicated at 2a, and when pressed against the inner side of such row may be flexed into a position in which its normal concave side becomes convex as indicated at 2b. To facilitate the securing of such flexure the portion 2 preferably, but not necessarily, is progressively tapered in thickness toward its outer free end. Preferably the degree of resiliency of the body portion of the brush and the degree of stiffness of the brush are such that the desired fiexure of the brush may be secured without collapsing the bristles when the outer end portion of the brush is pressed against the teeth so long as that portion amounts to a substantial fraction of the length of the brush, which fraction conveniently, but without limitation thereto, may be about one-quarter the length of the brush.

Preferably the longitudinal curvature of the brush portion 2 of the body of the toothbrush is such that when the brush is applied to the outer or convex side of the row of teeth I (Fig. 3) said body portion will be bent into a position of lesser curvature as indicated for example at 20. in Fig.

3 which corresponds to the dotted line position of the part 2 indicated at 2a in Fig. 2. Consequently, assuming the bristles are of substantially the same length throughout the longitudinal extent of the brush, the curvature of the brush body portion 2 is preferably approximately that of the greatest curvature of the row of teeth so that the bristles when operating on the convex or outer side of the row will by flexure of the portion 2 always conform to the teeth throughout substantially the entire length of the brush. In cases where it is desired to have the bristles of progressively changing length, say for example shorter at the mid portion of the length of the brush than at its opposite end portions, the curvature of the brush body portion 2 may be correspondingly changed to secure the same effect as when the bristles are of substantially the same length throughout the longitudinal extent of the brush.

The toothbrush is applied to the inner or concave side of the row of teeth in the usual manner so that only the bristles toward the front end of the brush are operative. Under these conditions the body portion 2 flexes so that the normally convex side thereof becomes concave, the portion 2 under these conditions assuming a position indicated for example at 2b in Figs. 2 and 3. However, by reason of this flexure of the portion 2, a greater lengthwise extent of the brush will be effective to operate on the teeth than in toothbrushes heretofore constructed. For example, with the present toothbrush about two-thirds the length of the brush may simultaneously operate on the inner side of the teeth, while with toothbrushes as ordinarily constructed but about one-quarter the length of the brush may simultaneously operate on the teeth. Furthermore with toothbrushes as heretofore constructed the same may operate on the inner concave side of the row of teeth only by collapsing a large extent of the bristles, but with the present brush because of the fiexure of the 'body portion 2 such collapsing of the bristles does not occur.

It will be observed that, in respect to securing the above described action when operating on the inner or concave side of the row of teeth, the flexible body portion 2 of the brush could be straight and still flex to secure such action. This however could be secured in such case only at a sacrifice of the advantage secured by a flexible curved body portion 2 when operating on the outer side of the row of teeth.

It will be understood that within the scope of the appended claim wide deviations may be made 3 from the form of the invention described without departing from the spirit of the invention.

I claim:

A toothbrush having a handle, the latter at one end thereof carrying a longitudinally urved bendable elongated part tapered toward its free end formed of a single piece of resilient material presenting continuous longitudinal exterior surfaces for the entire length of said part on all sides thereof, said part being provided at its 10 concave side with a row of projecting brush bristles distributed longitudinally thereof; the degrees of curvature and taper of said part, the resiliency of said material, and the stiffness of'said bristles being such as to cause said part to bend 15 1,327,807

transversely and resiliently press said rcw" of bristles against the convex side of :a row of human teeth of lesser degree of curvature than said part when said bristles are applied thereto, and said part to bend to cause itsconcave side to become 20 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date "758,764 Macleod May 3, 1904 759,490 Yates May 10, 1904 Burleigh June 13, 1920 "1,466,723 Izawa Sept. 4, 1923 1,494,448 Sookne May 20, 1924 1,928,328 Carpentier Sept. 26, 1933 2,254,365 Griffith et a1 Sept. 2, 1941

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US758764 *Dec 21, 1901May 3, 1904William A MacleodTooth-brush.
US759490 *Dec 8, 1902May 10, 1904Florence Mfg CompanyTooth-brush.
US1327807 *Oct 26, 1918Jan 13, 1920Burleigh Paul BToothbrush
US1466723 *Nov 12, 1921Sep 4, 1923Riichiro IzawaToothbrush
US1494448 *Oct 5, 1922May 20, 1924Sookne JosephToothbrush
US1928328 *Nov 25, 1931Sep 26, 1933Erik Dempster LindegrenToothbrush
US2254365 *Jun 6, 1939Sep 2, 1941Griffith Edward EConvertible toothbrush
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2685703 *Apr 27, 1949Aug 10, 1954Edward F DellenbachToothbrush
US4227276 *Feb 7, 1979Oct 14, 1980Ginsburg Stephen JToothbrush with thermally deformable handle
US4520526 *Jun 22, 1984Jun 4, 1985Peters Charles WResiliently flexible toothbrush
US4829621 *Jul 9, 1986May 16, 1989Phenegar John SToothbrush
US5040261 *Oct 31, 1989Aug 20, 1991Blendax GmbhGripping slide for a toothbrush handle
US5105499 *Mar 1, 1991Apr 21, 1992The Procter & Gamble CompanyToothbrush having handle joined to brush head by non-pinching flexible twin beam structure
US5146645 *Mar 1, 1991Sep 15, 1992The Procter & Gamble CompanyToothbrush employing resiliently buckling arch to indicate excessive brushing pressure
US5371915 *Apr 6, 1993Dec 13, 1994Key; John R.Angular headed toothbrush
US5511275 *May 16, 1995Apr 30, 1996The Procter & Gamble CompanyToothbrush exhibiting three-dimensional bristle profile and end rounded bristles for improved interproximal cleaning without increasing gum irritation
US5778478 *Jun 12, 1997Jul 14, 1998Coleman; Brian V.For use in a prison
US5926897 *May 10, 1996Jul 27, 1999The Procter & Gamble CompanyToothbrush having bristles for interproximal cleaning
US6178583May 28, 1999Jan 30, 2001The Procter & Gamble CompanyToothbrush having bristles for interproximal cleaning
US6357074Apr 7, 1999Mar 19, 2002Coronet-Werke GmbhCleaning brush, especially a toothbrush
US6675428 *Dec 15, 2000Jan 13, 2004Smithkline Beecham Consumer Healthcare GmbhToothbrush comprising a resilient flex region
US20120054971 *Sep 2, 2011Mar 8, 2012Dugan David MAnimal tooth brush
DE1171869B *Jun 13, 1962Jun 11, 1964Ingeborg NelkenZahnbuerste
EP1099392A2 *Nov 7, 2000May 16, 2001Addway Engineering LimitedDeformable toothbrush
WO1987001263A1 *Sep 4, 1986Mar 12, 1987Errol PastollToothbrushes
WO1994022346A1 *Apr 5, 1994Oct 13, 1994John R KeyAngular headed toothbrush
WO1997025900A1Jan 17, 1997Jul 24, 1997David Victor CannBrush head
WO1998005241A1Aug 1, 1997Feb 12, 1998David Victor CannA toothbrush
WO1999052395A1 *Apr 7, 1999Oct 21, 1999Coronet Werke GmbhCleaning brush, especially a toothbrush
WO2001003909A1Jul 10, 2000Jan 18, 2001Colgate Palmolive CoLaser joining toothbrush heads to handles
WO2003041533A2Nov 13, 2002May 22, 2003Colgate Palmolive CoHot air welding of toothbrush components
U.S. Classification15/167.1
International ClassificationA46B5/00
Cooperative ClassificationA46B2200/1066, A46B5/0025
European ClassificationA46B5/00B1