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RADIAL VANE FOR TOOTHBRUSH, TOOTHBRUSH USING THE SAME, METHOD AND APPARATUS FOR MANUFACTURING THE SAME AND METHOD AND APPARATUS FOR MANUFACTURING ANOTHER RADIAL VANE FOR TOOTHBRUSH
RADIAL VANE FOR TOOTHBRUSH, TOOTHBRUSH USING THE SAME, METHOD AND APPARATUS FOR MANUFACTURING THE SAME AND METHOD AND APPARATUS FOR MANUFACTURING ANOTHER RADIAL VANE FOR TOOTHBRUSH
In a 360-degree toothbrush in which a brush head is formed by superposing disk-shaped radial vanes 1 in an axial direction, the arranging pitch of the radial vanes 1 is increased so as to make the bristle density appropriate. Spacers are not used between the radial vanes 1 so as to increase the productivity, and to improve the hygiene condition. In order to realize these aspects, an annular protrusion or protrusions 3 are formed on one or both of the surfaces of an annular weld portion 2 of the radial vane 1. The annular protrusion 3 is formed at the same time when forming the weld portion 2 in a welding step in which the bristle bundle is opened radially and the center part is welded so that the radial vane 1 is manufactured.
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