the following detailed description illustrates the invention by way of example and not by way of limitation . this description will clearly enable one skilled in the art to make and use the invention , and describes several embodiments , adaptations , variations , alternatives and uses of the invention , including what we presently believe is the best mode of carrying out the invention . the brush according to the invention is composed of an elongated brush body ( 1 ), rectangular in shape , preferably having one to four longitudinal rows of holes ( 3 ) in the brush body to hold the bristles , and an elongated handle ( 2 ) perpendicular to the longitudinal direction of the brush body . the handle ( 2 ) is connected directly to the brush body ( 1 ) on one large side ( 4 ) of the latter ; or , on the rear face of the brush body in such a way that the plane of the front face of the brush body ( 1 ) is in a plane offset with respect to the plane containing the handle which has immediately after its point of origin a curve ( 5 ) which allows clearance of the jaw while the brush is being used . each of the two wings of the brush body on each side of the handle ( 2 ) is of sufficient length that the tufts of the end bristles reach the teeth at the back when the point of origin of the handle is in contact with the corner of the mouth . the handle has been designed so that in cross section , after its point of origin , it has an ovoid shape with diameters of 5 . 5 millimeters by 5 millimeters , and has a regular curve or contour ( 5 ) with a height of 6 . 7 centimeters and a maximum depth of 10 millimeters with respect to a line connecting the two ends of this curve . according to studies , in 95 % of cases this allows the chin to be cleared when the brush is used in the most comfortable position ; i . e ., the elbow pressed against the body , and the forearm , wrist and hand in the same plane very close to the chest in order to reduce as much as possible the effort due to brushing . because this brushing position is the most natural , it allows the bristles of the brush to be uniformly in contact with the teeth and gingivae for maximum effectiveness . on the curve , at 15 millimeters from the brush body , there is a narrowing ( 6 ) or deformation region that allows the brush to be moved laterally without changing the position of the brush body . this narrowing is centered in the longitudinal axis of the handle . it has a thickness of 1 . 5 millimeters , a length of 10 millimeters , and a height of 4 . 5 millimeters . it allows the lateral movement of the handle with respect to the brush body . for aesthetic reasons , it is covered with an elastic over - molding . after the first curve , the handle has a reverse curve of 2 ° ( two degrees ) which increases in volume because this is the area that is held by the hand . its thickness goes from 14 millimeters to 27 millimeters . the interior of the handle , in this larger part , is hollow for economy of weight and raw material . the grip has an over - mold of elastic material ( 7 ) and has 10 semicircles ( 8 ) for a better grip of the brush . it ends in a tripod the points ( 9 ) which are spaced 20 millimeters apart and which allows the brush to stand upright without support for better hygiene ( fig1 c ). the power brush is attached to the handle after the curved part required to clear the chin . the other brush examples are provided for the same handle as the one described above . according to another example of realization , the handle ( 2 ) is movably mounted on the body of the brush ( 1 ) in such a way that the longitudinal axes of the handle and brush body can take different directions . this mobility allows several advantageous configurations of the brush . the first consists of transforming the transversal brush according to the invention into a longitudinal brush where the axes of the handle and brush body are aligned , the handle being able to take any intermediate directions with respect to the brush body which allow the means of attachment and mechanical blocking of the handle to the brush body . thus the brush body , in its transversal center plane , has a gear - shaped truncated cone ( 10 ) with a 70 ° sweep angle with 12 rounded teeth in relief ( 11 ) with a value of 0 . 5 and 12 recessed rounded teeth ( 12 ) with a value of 0 . 5 . the rounded shape of the teeth was designed to limit the wear of the mechanism and to facilitate the orientation of the handle by elastic deformation of the cooperating parts . the teeth are equidistant from each other . the angle between one tooth in relief and the next recessed tooth is 15 °. on the upper base of the truncated cone is centered a shaft ( 13 ) the top of which has a radius of 1 . 85 millimeters and a height of 1 millimeter , and the bottom has a radius of 1 . 55 millimeter and a height of 1 millimeter . this top part of the shaft is called the retention lip ( 14 ). this cone and shaft assembly is of the same material as the brush body and they are molded together at the same time . the handle is elongated at its end by a hood ( 15 ) the circular base of which has a diameter of 11 . 6 millimeters , the top a diameter of 5 millimeters , with a height of 4 . 6 millimeters . the top has an aperture ( 16 ) with a radius of 1 . 55 millimeters in order to clip it onto the shaft , so that the assembly cannot be taken apart . according to a first variation , inside the hood ( fig3 b ) and at its top , in front of the end of the handle , there are two rounded 0 . 5 teeth ( 17 ) for blocking the handle , hood and brush body assembly in position . inside of the hood , throughout its fall height there is a conical part of a cylinder ( 18 ) opposite the teeth in relief of the brush body , for the purpose of centering and blocking the handle in position . the change from one tooth to the other is possible because of the elasticity of the cooperating parts and the slight raising ( 0 . 5 millimeter ) of the hood when changing from one tooth to the other tooth . the seal for the upper part of the hood is ensured by the diameter of the shaft being identical to that of the aperture of the hood . the lower seal is ensured by a recessed circular guide track ( 19 ) in the brush body , and by the base of the hood ( 20 ) which is accommodated therein . according to a second variation , fig3 a there are three cylinder parts ( 21 ) equidistant from each other to come into contact with the teeth in relief , thus ensuring the centering of the assembly . the blocking - in - position is made possible by a pawl ( 22 ) acting as a tooth and cooperating with the teeth of the cone of the brush body . the change of position of the handle is possible because of the elasticity of cooperating parts and by the slight raising ( 0 . 5 millimeter ) of the hood . according to another example of realization , approximately on the transversal central plane of the brush body ( fig2 b ), there is a truncated cone with smooth surface ( 23 ) topped by the same type of shaft as described where the cone is toothed , and in which the handle has , opposite its end , a circular hood the internal surface of which exactly fits on the outer surface of the cone of the brush body . because the top of the hood is apertured as in the examples described above , the blocking in position is achieved by friction of one cone inside the other . in view of the above , it will be seen that the several objects and advantages of the present invention have been achieved and other advantageous results have been obtained . as various changes could be made in the above constructions without departing from the scope of the invention , it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense .
the invention features a so - called transversal toothbrush to ensure greater brushing efficiency between the teeth and at the neck level of the teeth . it is characterized in that the direction of the handle is preferably perpendicular relative to the longitudinal direction of the brush body . the handle is either connected fixedly with the brush body but with a deformation region for transversal or longitudinal use , or it is mounted movably on the brush body . a mechanism for blocking it in position are provided on the brush body by a truncated cone topped by a shaft and opposite , on the handle , by an apertured hood comprising two lugs and part of a cylinder .