Tongue for a seatbelt device and fabrication method thereof

Abstract

A tongue for a seatbelt device includes: a metal core at which an insertion portion is formed continuously from a metal core base portion; a molded portion formed by the metal core base portion of the metal core being covered with a synthetic resin material; a webbing pass-through portion, one end of which opens along the thickness direction of the metal core base portion in one face of the molded portion, and another end of which opens in an end portion of the molded portion at a side opposite to the insertion portion; and a groove portion formed between the metal core base portion and the webbing pass-through portion, the groove portion opening in the end portion of the molded portion at the side opposite to the insertion portion and opening in an inner periphery face of the webbing pass-through portion.

What is claimed is: 
     
         1 . A tongue for a seatbelt device, comprising:
 a metal core at which an insertion portion is formed continuously from a metal core base portion in which a penetrating hole through which a webbing passes is formed, the insertion portion being insertable into a buckle, and the penetrating hole penetrating in a thickness direction of the metal core base portion;   a molded portion that is formed by the metal core base portion of the metal core being covered with a synthetic resin material at surroundings of the penetrating hole;   a webbing pass-through portion through which the webbing passes, one end of the webbing pass-through portion opening along the thickness direction of the metal core base portion in one face of the molded portion, another end of the webbing pass-through portion opening in an end portion of the molded portion at a side opposite to the insertion portion, and the webbing passing through the inside of the penetrating hole at a penetration direction intermediate portion of the webbing pass-through portion; and   a groove portion formed between the metal core base portion and the webbing pass-through portion, the groove portion opening in the end portion of the molded portion at the side opposite to the insertion portion and opening in an inner periphery face of the webbing pass-through portion.   
     
     
         2 . A method for fabricating a tongue for a seatbelt device, comprising:
 covering a metal core base portion of a metal core with a synthetic resin material and forming a molded portion, at which metal core an insertion portion is formed continuously from the metal core base portion, the insertion portion being insertable into a buckle, and a penetrating hole through which a webbing passes being formed in the metal core base portion, the penetrating hole penetrating in a thickness direction of the metal core base portion;   during the forming of the molded portion, forming a webbing pass-through portion through which the webbing passes, by causing a core to enter the penetrating hole from one thickness direction side of the metal core base portion and providing a slide die at the other thickness direction side of the metal core base portion, one end of the webbing pass-through portion opening in one face of the molded portion at the one thickness direction side of the metal core base portion and another end of the webbing pass-through portion opening in an end portion of the molded portion at a side opposite to the insertion portion; and,   during the forming of the molded portion, supporting the metal core base portion with a protrusion that protrudes from a surface at the metal core base portion side of the slide die, and forming a groove portion that opens in the end portion of the molded portion at the side opposite to the insertion portion.