Toothbrush and method for manufacturing toothbrush
AssigneeLion Corporation
InventorsRyosuke Hachisuka, Toshiaki Kobayashi
Life of this patent
Estimating the term…
Abstract
A toothbrush capable of inhibiting damage of an oral cavity of a user that includes: a head section that has a bristle implanting surface on a front end side; a handle section that is disposed on a rear end side from the head section and has a handle section main body; and a neck section that is disposed between the bristle implanting surface and the handle section. The toothbrush has a deforming portion that is located on the rear end side from the bristle implanting surface and is deformed, while stress characteristics associated with bending due to an external force acting on the head section are in a plane stress condition.
Claims9
A toothbrush comprising:
- a head section that has a bristle implanting surface on a front end side;
- a handle section that is disposed on a rear end side from the head section;
- a neck section that is disposed between the bristle implanting surface and the handle section;
- and
- wherein the neck section is located on the rear end side from the bristle implanting surface and has a deforming portion that is deformed, by an external force in a longitudinal direction of the handle section acting on the head section, by bending in a direction parallel with the bristle implanting surface and orthogonal to the longitudinal direction of the handle section while exhibiting a plane stress condition in the deforming portion,
- wherein the deforming portion includes a core portion that is formed of a hard resin and a soft portion that is formed of a soft resin,
- a region where the deforming portion is deformed is covered with the soft resin over the entire length direction,
- wherein the core portion has second moment of area of 0.05 mm4 or larger and 5.8 mm4 or smaller in the bending direction due to the external force.
A method for manufacturing a toothbrush, comprising:
- a step of designing a toothbrush including a head section that has a bristle implanting surface on a front end side, a handle section that is disposed on a rear end side from the head section, and a neck section that is disposed between the bristle implanting surface and the handle section;
- and
- a step of molding the designed toothbrush,
- wherein designing the toothbrush includes designing that the neck section is located on the rear end side from the bristle implanting surface, and has a deforming portion that is deformed, by an external force in a longitudinal direction of the handle section acting on the head section, by bending in a direction parallel with the bristle implanting surface and orthogonal to the longitudinal direction of the handle section while exhibiting a plane stress condition in the deforming portion,
- wherein the deforming portion includes a core portion that is formed of a hard resin and a soft portion that is formed of a soft resin,
- a region where the deforming portion is deformed is covered with the soft resin over the entire length direction,
- wherein the core portion has second moment of area of 0.05 mm4 or larger and 5.8 mm4 or smaller in the bending direction due to the external force.
Dependencies are inferred from the claim text.