TOOTHBRUSH

WIPO Patent Application WO/2022/137971

A1

The purpose of the present invention is to provide a wide head type toothbrush in which the neck part is prevented from bending in the width direction thereof and from being twisted in the circumferential direction about the long-axis direction thereof. The maximum length of the head part in the width direction is 12-18 mm. The maximum length of the head part in the thickness direction is 2-4 mm. The minimum length of the neck part in the width direction and the minimum length of the neck part in the thickness direction are 3-5 mm. In the neck part, when let a region from a second position to a third position which is at a distance corresponding to 65% of the length of the neck part from the second position is defined as C, and when a region from the third position to a fourth position which is a boundary between the neck part and a grip part and which is at a distance corresponding to 35% of the length of the neck part from the third position is defined as D, the relation (volume of region D)/(volume of region C)≥1.0 is satisfied. At the fourth position, the maximum length in the width direction is greater than the maximum length in the thickness direction.

KIMOTO YUYA (JP)
TAKAI RYOSUKE (JP)
ISHIKAWA KOUDAI (JP)
LI JIAWEI (JP)

PCT/JP2021/043227

June 30, 2022

November 25, 2021

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LION CORP (JP)

A46B5/00

WO2020095867A1	2020-05-14
WO2018079114A1	2018-05-03
WO2017155033A1	2017-09-14

JP2007075514A	2007-03-29
KR20030016440A	2003-03-03

TAZAKI Akira et al. (JP)

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