Toothbrush

Abstract

A toothbrush has a brush head, at least one folded bristle bundle and at least one plastic anchor plate, wherein the brush head has a hole with a longitudinal axis for the at least one bristle bundle, wherein an anchor plate is fixed in the hole to anchor the respective bristle bundle, the anchor plate being held in two grooves running parallel to the longitudinal axis, which are formed in the hole by injection molding, the grooves having a centering section which, when viewed in a direction perpendicular to the longitudinal axis, has a depth that successively decreases with increasing distance from an entrance of the hole.

1 . A toothbrush comprising: a plastic brush head, at least one folded bristle bundle, and at least one plastic anchor plate,
 the brush head having a hole for one of the at least one folded bristle bundle, with a longitudinal axis and a hole cross-section with a basic shape for receiving the one of the at least one folded bristle bundle, and an anchor plate fixed in the hole for the purpose of anchoring a respective on of the at least one bristle bundle,   wherein a wall of the hole comprises two grooves running parallel to the longitudinal axis and extending beyond the basic shape of the hole cross-section injection molded in the wall of the hole,   wherein   the anchor plate is fixed in the two grooves in the U-shaped profile by a weld, and   the two grooves have, adjacent to an entrance of the hole, a combination section with centering and tapering section, which, when viewed in a direction perpendicular to the longitudinal axis has a depth and a width which successively decrease with increasing distance from an entrance to the hole.   
     
     
         2 . The toothbrush according to  claim 1 , wherein the two grooves each have a constant section which, when viewed in the direction observed in the direction perpendicular to the longitudinal axis has a width and a depth which are each constant along the longitudinal axis. 
     
     
         3 . The toothbrush according to  claim 1 , wherein the depth of the combination section with centering and tapering section decreases in two stages. 
     
     
         4 . The toothbrush according to  claim 1 , wherein the width of the combination section with centering and tapering section decreases in two stages. 
     
     
         5 . The toothbrush according to  claim 1 , wherein the width of the constant section is greater than a thickness of the anchor plate. 
     
     
         6 . The toothbrush according to  claim 1 , wherein an anchoring direction formed by the opposing two grooves is at an angle greater than zero to a hole line direction of directly neighboring holes. 
     
     
         7 . A method for manufacturing a toothbrush with a brush head made of plastic and with at least one bristle bundle anchored in the brush head, comprising the following steps:
 a) providing a brush head with a hole for fixing the at least one bristle bundle with a longitudinal axis and a hole cross-section with a basic shape for receiving one of the a least one folded bristle bundle, wherein in a wall of the hole two grooves running parallel to the longitudinal axis and extending beyond the basic shape of the hole cross-section are formed by injection molding, the two grooves having, adjoining an entrance to the hole, have a combination section with centering and tapering sections, which, when viewed in a direction perpendicular to the longitudinal axis, has a depth and a width that successively decrease with increasing distance from an entrance of the hole.   b) providing a plastic anchor plate for anchoring a respective one of the at least one folded bristle bundle in the hole, and   c) inserting the anchor plate with the one of the at least one folded bristle bundle into the hole, whereby the anchor plate is inserted into the combination section of the grooves and fixed in the u-profile using a friction welding process.   
     
     
         8 . A method according to  claim 7 , wherein the two grooves each have a constant section which, when viewed in the direction perpendicular to the longitudinal axis has a width and a depth which are each constant along the longitudinal axis. 
     
     
         9 . The toothbrush according to  claim 1 , wherein the width of the constant section is greater than a thickness of the anchor plate by at least 5% and by at most 100%.