Patent ID: 7128290

Claim:
A spool suitable for winding material thereon, said spool comprising: an axially extending body having a proximal end and a distal end joined by an outer surface; an axially extending slot formed in said body outer surface; a cam disposed in said slot and rotatable mounted for movement between a closed position and an open position, wherein in said closed position, said cam secures the material to the spool and a portion of said cam extends out of said slot to define an effective diameter of said spool, and in said open position, said cam is spaced from said body defining a gap between said outer surface of said body and said cam for receiving the material between said body and said cam and at least a portion of said cam retracts toward said body outer surface to decrease the effective diameter of said spool compared to when said cam is in said closed position, in which said body is rotatably mounted for rotation in one direction to wind material thereon, and said cam is rotatably mounted for rotation in the same direction to move said cam from said open position to said closed position, wherein winding the material onto said spool urges said cam toward said closed position.