SCREW GROMMET
A plastic screw grommet includes a head portion and a leg portion having an end portion which is moved to a head portion side due to a screw advancing operation of a screw body inserted from the head portion side. The plastic screw grommet is structured so as to expand an intermediate portion by inserting the end portion, which is moved to the head portion side, into an inside of the intermediate portion of the leg portion between the end portion and the head portion. An outer surface of the end portion contacting an inner surface of an expanded portion of the intermediate portion at a time of the expansion is structured so as to have a shape following the inner surface of this expanded portion.
1 . A screw grommet, comprising:
a head portion, and
a leg portion having an end portion which is moved to a head portion side due to a screw advancing operation of a screw body inserted from the head portion side;
wherein the screw grommet is structured so as to expand an intermediate portion by inserting the end portion, which is moved to the head portion side, into an inside of the intermediate portion of the leg portion between the end portion and the head portion, and
an outer surface of the end portion contacting an inner surface of an expanded portion of the intermediate portion is structured so as to have a shape following the inner surface of this expanded portion at a time of the expansion.
2 . A screw grommet according to claim 1 , wherein the outer surface of the end portion contacting the inner surface of the expanded portion of the intermediate portion at the time of the expansion of the intermediate portion of the leg portion has a curved surface having a curvature following the curvature of the inner surface of this expanded portion.
3 . A screw grommet according to claim 1 , wherein the intermediate portion of the leg portion is divided into multiple piece portions by slits along an axis line direction of the leg portion, and guide portions which are inserted into the slits and guided are formed in the end portion.
4 . A screw grommet according to claim 1 , wherein a female screw corresponding to a male screw of the screw body is formed on an inside of the end portion.