Patent ID: 8636454

Claim:
A fastener comprising: a pin including a head portion and a shaft portion extended from the head portion; and a metal plate spring member which receives the pin and adapted to be disposed in a mounting hole, the plate spring member including: a base portion adapted to be brought into an engagement with a front side of the mounting hole and including an insertion hole through which the pin is inserted; and a pair of elastic engagement pieces extended from the base portion and adapted to be engageable with each other so as to restrain the pair of elastic engagement pieces against their elastic restoring force in a closed state, wherein engagement shoulder portions are formed at axially intermediate positions of the pair of elastic engagement pieces so as to engage with a circumferential edge of a back side of the mounting hole when the pair of elastic engagement pieces are disengaged and expanded through the elastic restoring force and to pass through the mounting hole when the pair of elastic engagement pieces are contracted, and wherein the shaft portion is adapted to disengage the pair of elastic engagement pieces when inserted between the pair of elastic engagement pieces in the closed state and restrict the pair of elastic engagement pieces from contracting inwards by being disposed between the pair of engagement pieces in an opened state.