Patent ID: 8245367

Claim:
A fastener comprising a main body which is brought into engagement with a mounting hole formed in a mount-base part to be fixed therein and a pin member which is inserted into the main body for releasing the engagement of the main body with the mounting hole, wherein the main body includes a base portion which is brought into abutment with a front circumferential edge of the mounting hole and a leg portion which projects from a rear surface side of the base portion so as to be inserted into the mounting hole, the base portion having an insertion opening for the pin member provided on a front side thereof, the leg portion having a pair of facing elastic engagement pieces provided thereon for engagement with a rear circumferential edge of the mounting hole, wherein the elastic engagement pieces are shaped to extend from proximal end portions thereof towards the base portion, wherein the elastic engagement pieces each comprise: a tapering surface gradually projecting outwards as extending towards the base portion, on an outer surface thereof: a top portion projecting most outwards of the tapering surface; and an engagement stepped portion being reduced in a projecting height gradually from the top portion to be brought into engagement with the rear circumferential edge of the mounting hole, wherein the elastic engagement pieces further comprises distal end portions each formed to extend from an inner side of the engagement stepped portion towards the insertion opening for the pin member, wherein the pin member includes a head portion and an insertion portion which projects from one side thereof, the insertion portion having a pressing surface provided thereon for pressing the distal end portions of the pair of elastic engagement pieces when the pin member is inserted into the base portion to be pushed a predetermined distance thereinto so as to deflect the pair of elastic engagement pieces inwards to such an extent that the pair of elastic engagement pieces are not brought into engagement with the mounting hole, and wherein a pin-side engagement portion and a main-body-side engagement portion are provided between the pin member and the base portion of the main body for holding the pin member in a predetermined pushed-in position when the pin member is inserted into the base portion.