Pivotal unit for barbell
A barbell includes a rod with two tubular members respectively mounted to the two ends thereof. Each tubular member accommodates a pivotal unit which is mounted to the rod. Each pivotal unit has a washer stopped by a shoulder of the tubular member. The washer has an annular recess in one side thereof. A sleeve is rotatably and axial movably mounted to the rod. The sleeve is located between the rollers of the bearing and the rod. The bearing is positioned by a positioning member and an end piece. The annular recess allows the sleeve to move along the rod so that the sleeve is freely rotatable relative to the rollers of the bearing. The sleeve is made by the same material as the rollers. The sleeve contacts the rod by a large area so that when the pivotal unit is rotatable relative to the rod, no noise is generated.
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Jih Ming
Chen