Pivotal Unit For Barbell

Abstract

A barbell includes a rod and two tubular members are respectively mounted to the two ends of the rod. Two pivotal units are respectively located in the two tubular members and mounted to the two ends of the rod. Each pivotal unit has a washer, a bearing, a sleeve and a positioning member. The washer has a recess defined in one side thereof. The bearing is securely connected to the inside of the tubular member and a first end of the bearing contacts the washer. The sleeve is located in the bearing and securely mounted to the rod, a first end of the sleeve is movably engaged with the recess of the washer. The positioning member is a U-shaped manner and engaged with a groove defined in the rod. The positioning member contacts two respective seconds of the sleeve and the bearing.

What is claimed is: 
     
         1 . A barbell comprising:
 a rod having two grooves respectively defined in two ends thereof, two tubular members respectively mounted to the two ends of the rod, each tubular member having two open ends, and   two pivotal units respectively located in the two tubular members and mounted to the two ends of the rod, each pivotal unit having a washer, a bearing, a sleeve and a positioning member, the washer having a recess defined in one side thereof, the bearing being connected to the tabular member, a first end of the bearing contacting the washer, the sleeve securely mounted to the rod and located in the bearing, a first end of the sleeve being movably engaged with the recess of the washer, the positioning member being a U-shaped member and having an opening, the positioning member connected to the rod and engaged with the groove via the opening, the positioning member contacting two respective seconds of sleeve and the bearing.   
     
     
         2 . The barbell as claimed in  claim 1 , wherein the rod extends through the two tubular members and as shoulder is formed in an inner periphery or each of the two open ends of the tubular member, the washer contacts the shoulder. 
     
     
         3 . The barbell as claimed in  claim 1 , wherein one of the two ends of the rod extends beyond the positioning member and an end piece is mounted to the end of the rod and connected to the open end of the tubular member, the end piece contacts the positioning member. 
     
     
         4 . A barbell comprising:
 a rod having two grooves respectively defined in two ends thereof, two tubular members respectively mounted to the two ends of the rod, each tubular member having two open ends, and   two pivotal units respectively located, in the two tubular members and mounted to the two ends of the rod, each pivotal unit having a self-lubricating sleeve and a positioning member, the self-lubricating sleeve mounted to the rod, the positioning member being a U-shaped member and having an opening, the positioning member connected to the rod and engaged with the groove via the opening, the positioning member contacting the self-lubricating sleeve.   
     
     
         5 . The barbell as claimed in  claim 4 , wherein the rod extends through the two tubular members and a shoulder is formed in an inner periphery of each of the two open ends of the tubular member, the self-lubricating sleeve contacts the shoulder. 
     
     
         6 . The barbell as claimed in  claim 4 , wherein one of the two ends of the rod extends beyond the positioning member and an end piece is mounted to the end of the rod and connected to the open end of the tubular member, the end piece contacts the positioning member.