Patent ID: 7275286

Claim:
A pivot device comprising: a pivot axle ( 10 ) having a shank ( 12 ) formed on an end thereof; a seat ( 20 , 20 a , 20 ′) having a base ( 21 ) and an elastic device ( 22 , 22 ′) mounted on the base ( 21 ); a first ring ( 30 ) provided on the elastic device ( 22 , 22 ′), and an opening ( 31 ) configured to drivingly mate with the shank ( 12 ) and defined in a center thereof, two lugs ( 32 ) formed on two diametrically opposed sides of the first ring ( 30 ) and respectively having two arcuate opposed ends, and a perpendicular nub ( 33 ) formed on an outer circumference of the first ring ( 30 ), whereby the shank ( 12 ) is inserted into the first ring ( 30 ) and the nub ( 33 ) is pressed against the elastic device ( 22 , 22 ′); a second ring ( 23 ) formed on the base ( 21 ) and upwardly disposed on a top end of the elastic device ( 22 , 22 ′) and having a hole ( 231 ) defined in a center thereof, two opposed cutouts ( 232 ) respectively defined in two diametrically opposed sides of the second ring ( 23 ) and facing the elastic device ( 22 , 22 ′) and corresponding to the lugs ( 32 ), two arcuate ends formed on two opposed sides of each cutout ( 23 ), whereby the shank ( 12 ) is inserted into the second ring ( 23 ) via the hole ( 231 ), wherein the shank ( 12 ) is sequentially inserted into multiple resilient disks ( 40 ), a washer ( 50 ) and a fastener ( 60 ), and the fastener ( 60 ) is securely provided on a distal end of the shank ( 12 ).