US2214407A - Toothbrush with brush head made in three parts - Google Patents

Description

Sept. 10,1940.

A. A. DEUTSCH 2,214,407

TOOTHQRUSH WITH BRUSH-HEAD MADE IN THREE PARTS Filed April 1, 1937 Patented Sept. 10, 1940 U TE @STATEs 1,214,407 V g Y I 'roornnausn .wrrn mwsn 1mm a m THREE ran-rs August AndreasDeutsch, Vienna, Austria, assign- .or to Wilhelm Ernst Reeser, Modling-Hinterbruhl Austria I Application'April '1, 1931; Serial Nb. 134,444 Y j Y In AustriaD ecember 5,1936

4 Claims. (01; 15-10%) This invention relates to, a toothbrush, the

brush head of which is made in two or threeparts, and the improvement consists essentially inthat the end bristles on the longitudinal sides of the lateral bristle carriers are longer than the middle groups of bristles in th'eseparts.

By this construction an" easier; and 7 more thorough cleaning of the teeth is obtained than by the toothbrushes "having multi-part ,brush heads of known construction, asthe longer end bristles of the lateral brush heads completely engage over the entire surface of each tooth; and 1 during the brushing these longer end bristles penetrate into the gaps between the teeth. The bristles of the lateral brush heads'also act upon the edge of the gums and massage the same. The brushing surface of thebottom partsof the toothbrush with agthree-part brush head may be dome shaped, so that it may better' adapt itself to the irregularities of the mastic ting surfaces, than a plane brush surface.

Three embodiments of the which: v Figl'l shows a top plan view and 3 Fig. 2 a front elevation-of atoothbrush accordingto the invention,

. Figs. 3,4 r o s illustratep intop lan; view,, elevation, and longitudinal section, a second form- Y of construction of the toothbmsh. I

' construction,

, Fig. .7 1 an'end view ofFig'f6,,and Fig. 8 a topplan'viewof'FigTfi. As shownin Figs. land-2- the brush head I is of U-shape in transverse cross'section; arms-I extending at right'angles from the bottom plate 3. The bristles inthe' arm! are of different" v lengths, the bristles 5, being cut so that the brush surface formed by the free ends of these bristles is concave. Consequently the open space border- 1 ed by vthe'bristles 5, of both arms 2 11s.; the shape 'of an oval open at its longitudinalends. The bristles I of ,the bottom part 32am all of even.

length and as short as possible.-

'In theftoothbrushishown"in-"Figs; 3 to 5- dilly the bristles 5a of the bunches at theends of the longitudinal sides are longer than theremaining bristles 5a. The bristles' 4a mounted in the bottom part 3a are out to form a curved surface. As shown in Fig. 4, the arms 2a are connected with the bottom part by means of strips having an undulated cross section. By this means a good resiliency of the material forming the 55 brush head is secured at the joints between the v V invention are ,il-u lustrated. in the accompanying drawing, in:

" f Figs. 6-to'8gar oval plates so that the br tles Fig. are a 's ide'ielevation of a 'third form of;-

plate 3a and the arms 2a that bristles of these arms will always engage 'the' teeth irrespective of their e'xactsize;

A toothbrush constructed as described presentsthe-advantage that-thebristles of the lat- .eral brush heads completely brush every single tooth, in that thelrregular bristle surfacescan adapt themselves perfectly to-the shape of the teeth. in the mouth, the bristles penetrating also -intothe gaps between the teea-h and into the delo pressions in the mastlcating surfaces. Theedge of the gums is also gripped by the bristles .and

massaged.

, If the arms 2 of the brush head] are not straight as in Fig. ,1, but are slightly convex inwardly, as )5 in Figs.'6 to 8, the middle bristle bunches 5b of the arms 2b may be shorter or the end bunches of bristles 5b longer than iii the arms were quite straight, sothat the bristlesin the "middle are as resistant .as possible and those which penetrate 2 into the gaps between the teeth areas flexible as possible.

The bristle carriers of the tootnbmshgntwnm are better distributed and better adapted to the [shape of the teeth and the manipulation of the toothbrush is easier. The two lateral bristle carriers or plates 26 are concaveand arrangedsothat, theyforman obtuse angle with thebottom plate lb and consequently havea slightly, resil- 'ient" effect.

The handles 1- 6a, 0. 6b of the toothbrush is slightly curved and attached on the bottomplate v3, 3a, or 317 respectively, atsubstantially the cenftralpart of the'latter so that the handle'forms a kind of pressure lever when the toothbrush is I being used.

As shown in Figs. 1, 3and 8, the bristles at the ends of both ofthe lateral plates or arms 2', 2a

andlb respectively, located foremost or'rearmost respectively in the longitudinal direction, that is the direction of the handle or, of the lineof teeth engaged for of the motion of the brush, are ar-: ranged in bundles having their axes inclinedat acute angleswith respect to a plane drawn at u I right angles. to the longitudinal direction. ,By

this-arrangement the bristles enterthe gaps be-' tween adjacent teeth more efilci'ently so as to remove residuesfrom these gaps.

Also toothbrushes with a two-part brush head so may be constructed according to the invention.

What I claim is:

1. A toothbrush which is symmetrical with respect to a middle longitudinal plane thereof, said brush having a handleand a three-part u said lateral plates, said bristles being' arranged,

in bundles having their axes inclined at an acute angle with respect to av plane drawn at right angles to the longitudinal direction of the brush.

2. A toothbrushwhich is symmetrical with respect toa middle longitudinal plane, having a handle, a three-part brush head, said brush head .comprising a body plate secured to said handle and two-lateral plates-connected to said body plate and angular'ly disposed relatively thereto, bristles on said body plate forming a convex dome-shaped brush surface, and bristles on said lateral plates, the bristles at the ends of both of said lateral plates located foremost and rearmost respectively in the longitudinal direction 0! the brush being longer than the bristles at the intermediate portions of said lateral plates, said end bristles being arranged in bundles having their axes inclinedat acuate angles with respect to a plane drawn at right angles to thelongitudinal direction of the brush.

3. A toothbrush which is symmetrical with respect to a middle longitudinal plane, having a handle, a three-part brush head, said brush head comprising a body plate secured to said handle and two lateral plates connected to said body plate by means of strips having an undulated cross-section, said lateral plates being angularly disposed relatively to said body plate,

bristles on said body plate and bristles on said spect to a middle longitudinal plane, having a handle, a three-part brush head, said brush head comprising a body plate integral with said handle and connected with said handle substantially at the central portion of said plate, and two lateral plates connected to said body plate and angularly disposed relatively thereto, bristles on said body plate and bristles on said lateral plates, the bristles at the ends of both of said lateral plates located foremost and rearmost respectively in the longitudinal direction of the brush being longer than the bristles at the intermediate portions of said lateral plates, said end bristles being arranged in bundles having their axes inclined at acute angles with respect to a direction of the brush.

AUGUST ANDREAS DEUTSCH.

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