| 摘要 |
A fastener including a body portion having a head member and a shank member integrally formed with one side of the head member, the head member including a central aperture and at least one flexible engagement member intergrally formed with the head member opposite the shank member and extending intothe aperture a predetermined distance, the shank member including at least two substantially resilient leg member each having a conically shaped interior surface which oppose each other forming a tapered axial bore through the shank member tapering away from and in cooperative alignment with the aperture and a drive pin having a predetermined length and cross-sectional configuration for complementary engagement with the aperture, flexible engagement member, axial bore and leg members, the drive pin icluding at least a first concave longitudinal channel formed along its length and extending into the drive pin which includes at least a first lateral ramp member extending across the width of the first channel for cooperative engagement with the flexible engagement member so that upon insertion of the drive pin through the aperture the first ramp member engages and outwardly flexes the flexible engagement member to enable passage of the first ramp member thereby, the engagement member thereafter being releasably locked behind the first ramp member to restrict removal of the drive pin from the aperture of the head member.
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