US2090663A - Tooth brush - Google Patents

Description

Aug. 24, 1937. D N BOQTH 2,090,663

TooTH BRUsH Filed Dec. 15, 1934 INVENTOR.

BY 4% WM ATTORNEY;

Patented Aug. 24, 1937 UNITED STATES PATENT oFFlcF.

, TOOTH BRUSH David N. Booth, New York, N. Y.

Application December 15, 1934, Serial No. 757,637

4 Claims. (Cl. 15-167) My invention relates to an improvement in tooth brushes. The primary object thereof is to provide a brush of this character which embodies a cleaning surface that conforms to the shape of the teeth. A further object is to construct the brushing surface in such a manner that it effectively cleans all three exposed surfaces of the teeth simultaneously, to wit, the labial, lingual or palatal, and cutting or masticating surfaces.

10 A still further object is to provide a brush head for the tooth brush of arcuate shape which, in cross section, is rounded or curved.

Another object of the nvention is to prevent the brushing surfaces of the bristles of the brush 15 from coming into contact with the gums of the user. In order to accomplish this object, the end, or lower bristles, of the brush are constructed in such a manner that their side surfaces rest upon the top of the gum tissue to guide the brush along .30 the teeth of the user.

A further object of the invention is to provide a tooth brush having an arcuately shaped brush head in which the respective tip ends of the head have a rounded configuration.

. ,5 Still another object is to provide a brush construction of this character which through means of the curved brushing surface will permit the proper cleaning of the interproximal spaces between the teeth and also readily facilitate a thorough cleaning of lingual or palatal, labial and masticating portions of the teeth at the same time.

My invention further includes other objects, advantages and novel features of construction and arrangement hereinafter more particularly referred to in connection with the accompanying drawing, in which Big. 1 is a side elevation of a tooth brush made in accordance with the present inventive conception.

Fig. 2 is a plan view of the tooth brush as illustrated in Fig. 1.

Fig. 3 is a front elevation of the brush showing the position of the bristles in the brush head.

Fig. 4 is a cross section of the brush head taken 45 along line 4-4, Fig. 3.

Fig. 5 is a cross section of the head along line 5-5, Fig. 3.

Fig. 6 is a front elevation showing a modification of the form of brush head, and 50 Fig. 7 is a cross section of the brush head taken on line 1-1, Fig. 6.

Referring particularly to Flgs. 1 to 5, inclusive, the tooth brush as herein constructed comprises a brush head II and handle II. Thebrush head is 55 arcuate in form as indicated at I! in Fig. 3, the

same being approximately semi-circular. The handle of the brush is integral with the brush head, the handle extending perpendicularly from the head at the central side portion thei'eof' as indicatcd at |3. The respective lower tip surfaces of the bristle retaining head IO are curved as designated in the drawing at l4. A cross section of the arched head, Figs. 4 and 5 indicates that the extrados of the same is curved as shown at |5 to have an exterior rounded convex form, which extends laterally throughout the length of the arch. At the bristle retaining side or intrados of the head the laterally extending curved surface is concave in form.

The bristles of the brush extend from the interior surface of the arched concaved head IO to provide a brushing surface which conforms with the shape of the teeth. This brushing surface, as shown at IB in Fig. 3 is curved in a Vertical direction to conform to the lingual or palatal, and labial portions of the teeth. The bristlesin the upper part of the head provide a brushing edge for cleaning the masticating portions of the teeth. Fig. 4 of the drawing indicates that the bristles disposed in the head adjacent the side surfaces of the teeth are also curved in a horizontal direction as shown at I 1, so that the same are effective in cleaning the interproximal spaces between the teeth. The bristles of the brush head, which are adapted to clean the side walls of the teeth of the user have adjacent concave brushing surfaces curved in a horizontal directlon on both sides of the brush head, which curvature substantially corresponds to that of the laterally concave intrados. The lowest pair of effective bristles are employed to' clean the base of the teeth just above the gum tissue, these bristles being longer and closer together at their adjoining brushing surfaces than the remaining bristles in the brush head, the same being designated in the drawing at IB. The brushing surface of the long bristles |8 is straight as indicated at IS to provide a means for also cleaning the teeth in the front portion of the month. Bristles |8, extending from opposite sides of the brush head. situated below the curved tip surface bristles l'l, are positioned so that the tip surfaces of the same are spaced in substantially parallel relation.

In order to prevent the longer set of bristles from rubbirg upon the gum tissue of the user, a reinforcing set of bristles is employed below the same as indicated at 20. This set of bristles is not constructed with an end brushing surface inasmuch as the purpose of the same is to provide a non-irritating side surface which is rested upon the gum tissue of the user to efiectively guide the brush during use so that the brushlng surfaces 4 of the vlonger bristles II do not rub against the gum tissue.

:6 With reference to Figa 6 and 'I the modiflca- While I have shown and described the preferred embodiment of my invention, I do not desire to limit myself to the specific forms illustrated, but

may alter the construction and arrangement of parts as occasion requires without enlarging the scope of my invention or departing from the spirit thereof as contained in the appended claims.

I claim as my invention:

1. A tooth brush 'having an arch shaped head,`

a handle member extending perpendicularly from the crown of the head. the extrados of the arch -shaped head being constructed to include a laterally convex .curvature and the intrados being similarly formed to include a laterally concave curvature, both the convex and concave curvatures extending substantially throughout the distance of the arched surface. a plurality of bristles extending from the intrados of the head, the

bristles of the head adapted to clean the side walls of the teeth of -the user having adjacent concave brushing surfaces curved in a horizontal 5 direction, when the brush is held in position for use, on both sidesof the-brush head, substantially corresponding to that of the laterally concave intrados. w

2. A tooth brush having an arch shaped head,

40 a handle member extending perpendicularly from the crown of the head, the extradoa of the arch shaped head being constructed to include a laterally convex curvature and the intrados being similarly formed to include a laterally concave curvature. a plurality of bristles extending from the intrados of the head. the bristles of the head adapted to clean the side walls of the teeth of the user having adiacent brushing surfaces curved in both'a horizontal and vertical direction, when the brush-is held in position for use,

. and other bristles extending from opposite interior sides of the head, situated below the bristles adaptedtocleanthesidewallsoftheteethhaving brushing surfaces curved in a horiaontal direction when the brush' is held in a position for use.

4. Atoothbrushhavinganarchshapedhead, a handle member extending perpendicularly from the crown of the head, a piurallty of bristles projecting substantially radially from the interior face of the head adapted to contact slmultaneouslly both the inner and outer sides of the teeth of the user, the bristles extending from both sides of the brush head for cleaning the inner and outer side walls of the teeth having adiacent brushing surfaces curved in both a horizontal an'd Vertical direetion when the brush is held in position for use, the adjacent brushing surfaces which are horiaontally curved being concave in form.

DAVID N. BOOTH.

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