A tube retainer comprises a tube body; a center of the tube body being formed
with
a receiving space; the receiving space being formed by a large cambered surface
and a small cambered surface; one end of the tube body being formed with a tightening
portion; the tightening portion being formed with a slot communicated with the
receiving space and the outside of the tube body; a hole being formed in the tube
body and the hole passing through the slot; a pad having a cambered surface which
has the same radian as that of the receiving space; a protrusion protruding from
the outer cambered surface; the protrusion having a through hole for retaining
the screw fastener. The receiving space has a large cambered surface and a small
cambered surface. A threaded hole is formed in the tightening portion and at one
side of the through the slot and a via hole is formed in the tightening portion
and at another side of the slot. The small cambered surface is at the tightening
portion and is adhered to the pad.
