Patent ID: 7806771

Claim:
Torque transmission apparatus comprising: a flexible solid plastic circular insert component, which as a free standing component, has a plurality of exterior lobes and a plurality of interior lobes formed thereon, each exterior lobe and each interior lobe being disposed about the circumference of a circle, said insert component further having first and second faces disposed a selected axial width apart; each exterior lobe having a selected first width, each including first and second flat sides, the distance between the respective ends of said flat sides defining said first width, each exterior lobe having a perimeter comprising the first flat side leading into a first radiused corner, the second flat side leading into a second radiused corner, the radiused corners being connected by a central circumferentially disposed segment; each exterior lobe comprising a solid body of plastic material in the space defined by said perimeter and a line between said respective ends of said first and second flat sides; each interior lobe having a selected second width, each including third and fourth flat sides, the distance between the respective ends of said flat sides defining said second width; the third flat side leading into a third radiused corner, the fourth flat side leading into a fourth radiused corner, the third and fourth radiused corners being interconnected by a central circumferentially disposed segment; each interior lobe comprising a solid body of plastic material in the space encompassed by said perimeter and a line between said respective ends of said third and fourth flat sides; the first, second, third and fourth flat sides comprising driving surfaces, the first, second third and fourth radiused corners being shaped and dimensioned to provide a locking function in relation to a cooperating well of a cooperating coupling component.