Patent ID: 9314661
Filing Date: 2016-04-19
CPC Classification: A63B

Claim Text:
1. A barbell comprising: a rod having two ends, two tubular members respectively mounted to the two ends of the rod, each tubular member having two open ends which are a first end and a second end; two pivotal units respectively located in the two tubular members and mounted to the two ends of the rod; each pivotal unit having a first washer, a first bearing, a first sleeve and an end piece positioned in the first end of the tubular member, a second washer, a second bearing and a second sleeve being positioned in the second end of the tubular member, a stop mounted to the second end of the tubular member to seal the second end of the tubular member so as to prevent the second washer, the second bearing and the second sleeve from dropping from the second end of the tubular member; the first washer having a first annular recess defined in a first side thereof, a second side of the first washer being stopped by a shoulder in an inner periphery of the first end of the tubular member, the first bearing having first rollers located at an inner periphery thereof, the first sleeve located in the first bearing and rotatably and axially movably mounted to the rod, the first annular recess being sized to accommodate one end of the first sleeve, the end piece being threadedly connected to inner threads in the first end of the tubular member, the end piece sealing the first end of the tubular member and preventing the first washer, the first bearing and the first sleeve from dropping from the first end of the tubular member; the second washer having a second annular recess defined in a first side thereof, a second side of the second washer being stopped by another shoulder in an inner periphery of the second end of the tubular member, the second bearing having second rollers located at an inner periphery thereof, the second sleeve located in the second bearing and rotatably and axially movably mounted to the rod, the second annular recess being sized to accommodate one end of the second sleeve, two ends of the second bearing contacting against the second washer and the stop, the first and second sleeves located between the rod and the first and second rollers respectively, when the pivotal unit rotates relative to the rod, the first and second sleeves protect the rod from being worn out by the first and second rollers.