TOOTHBRUSH

WIPO Patent Application WO/2022/130770

A1

The purpose of the present invention is to provide a toothbrush that can deform over a broad range rather than locally while maintaining a stabilized grip feel. The present invention has a head part that is positioned toward the distal-end side in the long-axis direction and that has a bristle implantation surface, a gripping part that is disposed farther toward the rear end than the head part, and a neck part that is disposed between the head part and the gripping part. The neck part and the gripping part each have a hard section that is formed from a hard resin, and a soft section that is formed from a soft resin and that covers at least part of the hard section. In the neck part, the entire circumference of the hard section, in an area that spans to the position of the boundary with the gripping part and that is at least 70% of the long-axis-direction length of the neck part, is covered by the soft section. In a cross-section orthogonal to the long-axis direction, the value represented by S2/S1 is 4.5-6.0 (inclusive), where A is the position of an end section of the neck part on the long-axis-direction distal-end side of the soft section, S1 is the cross-sectional area of the soft section at the position A, C is the position of the boundary in the long-axis direction, and S2 is the cross-sectional area of the soft section at the position C.

JP3229399	Toothbrush structure with extendable brush head
JP3880761	BRUSH WITH HANDLE

TAKAI RYOSUKE (JP)

PCT/JP2021/038523

June 23, 2022

October 19, 2021

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LION CORP (JP)

A46B5/00; A46B5/02

WO2020095867A1

2020-05-14

US20170208933A1	2017-07-27
US20170150808A1	2017-06-01

TAZAKI Akira et al. (JP)

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