| 摘要 |
A blind rivet assembly for securing (12) workpieces (20, 21) having aligned bores with the workpieces (20, 21) having an open surface at an open side and a blind surface at a blind side, the blind rivet assembly including:
a tubular shell (10) having an enlarged shell head (14) adapted to be in engagement with the open surface of the workpieces (20, 21), the shell (10) adapted to extend through the workpiece bores and having a blind head section located at the blind surface of the workpieces (20, 21), the tubular shell (10) being formed with a through bore (15) extending towards the enlarged shell head (14) and with a head bore (16) through the enlarged shell head (14) of a diameter smaller than the through bore (15), wherein a stop shoulder (17) is located at a juncture of the through bore (15) and the head bore (16),
a stem (11) disposed in the through bore (15) and the head bore (16), the stem (11) having an elongated shank (22) with a stem head (23) at a blind end of the shank (22) and having gripping means at the opposite end adapted to be gripped by an installation tool for application of an axial pulling force, wherein proximate to the stem head (23) is a ring receiving portion (24) of the elongated shank (22) and proximate to the ring receiving portion (24) on the elongated shank (22) is a locking portion (25) and proximate to the locking portion (25) on the elongated shank (22) is a shearable break-groove (26), and
a placement ring (12) having a near end (35) and a far end (37), and having a pre-installation orientation and a post-installation orientation, wherein in the pre-installation orientation the placement ring (12) is disposed around the ring receiving portion (24) of the elongated shank (22), and the post-installation orientation is created by axially pulling the stem (11) towards the open side of the workpieces (20, 21) with an axial pulling force that forces the placement ring (12) into the through bore (15) which causes the shell (10) to deform outwards and form a blind head, the placement ring (12) and the stem (11) moving until the near end (35) of the placement ring (12) is located at a position proximate to the blind side of the workpieces (20, 21) and the placement ring (12) cannot progress any further due to the shell (10) deforming outwards and forming a blind shoulder that abuts against the blind side of the workpieces (20, 21) near the near end (35) of the placement ring (12), and wherein upon continued axial pulling of the stem (11), the stem (11) progressively moves into the shell (10) until the stem (11) encounters the stop shoulder (17), whereupon material of the stop shoulder (17) is moved into the locking portion (25) to arrest further movement of the stem (11), and whereupon increased axial force on the stem (11) shears a portion of the stem (11) on the open side at the shearable break-groove (26). |
