A fastener, for securing together first and second panel members having first and second hole means, wherein said first hole means has a diametrical extent greater than the diametrical extent of said second hole means and having predetermined axes, respectively defined therein and through which said fastener is to be passed so as to secure said first and second panel members together, comprising:
- a substantially cylindrical outer member defined by means of a substantially cylindrical body portion having a longitudinal axis and an external diametrical extent which is substantially less than the diametrical extent of said first hole means defined within said first panel member so as to permit lateral adjustable movement of said substantially cylindrical outer member and said fastener in a transverse direction with respect to said longitudinal axis of said substantially cylindrical outer member and relative to said first panel member;
- an axial bore defined within said substantially cylindrical body portion of said substantially cylindrical outer member;
- a flange portion provided upon a first end of said substantially cylindrical body portion for engagement with a first front surface of said first panel member;
- a plurality of axially extending notches defined within sidewall portions of said substantially cylindrical body portion of said substantially cylindrical outer member so as to extend along sidewall portions of said substantially cylindrical body portion which are intermediate said first end of said substantially cylindrical body portion and a second opposite end of said substantially cylindrical body portion;
- a plurality of elastically deformable cantilevered locking pieces integrally connected at one end thereof to said substantially cylindrical body portion of said substantially cylindrical outer member within the vicinity of end portions of said notches which are disposed toward said second end of said substantially cylindrical body portion of said substantially cylindrical outer member so as to have free end portions thereof projecting obliquely outwardly, respectively, from said notches toward said first flanged end of said substantially cylindrical body portion of said substantially cylindrical outer member, wherein said free end portions of said locking pieces are axially spaced a predetermined distance from said first flanged end of said substantially cylindrical body portion so as to permit said first panel member to be accommodated between said flanged end of said substantially cylindrical body portion and said free end portions of said locking pieces with said free end portions of said locking pieces freely disposed out of contact with a second rear surface of said first panel member so as not to interfere with said lateral adjustable movement of said substantially cylindrical outer member and said fastener in said transverse direction relative to said first panel member, and wherein further said free end portions of said locking pieces have outer surface portion means for engaging inner sidewall portions of said hole means defined within said second panel member such that when said axes of said first and second hole means of said first and second panel members are misaligned when said substantially cylindrical outer member and said fastener, mounted within said first panel member, are to be passed through said second panel member, said inner sidewall portions of said hole means of said second panel member will force said substantially cylindrical outer member and said fastener to move laterally within said hole means of said first panel member so as to permit said substantially cylindrical outer member and said fastener to be inserted through said second hole means of said second panel member;
- and a plurality of projections formed upon said second opposite end of said substantially cylindrical body portion and projecting substantially radially inwardly within said axial bore;
- and
- an insertion member for disposition within said axial bore of said substantially cylindrical outer member and for engaging said inwardly extending projections of said substantially cylindrical body portion of said substantially cylindrical outer member so as to expand said second opposite end of said substantially cylindrical body portion of said fastener radially outwardly with respect to a rear surface of said second panel member so as to engage said rear surface of said second member thereby securing said second panel member to said first panel member.