Patent ID: 7281613

Claim:
For an apparatus for controlling torque and/or rotation of a member about an axis, an interface disc for rotation about the axis in an operational direction comprising, in combination: first and second component discs having inner edges, outer edges, inner surfaces, and outer, interface surfaces; a plurality of elongated fins upstanding between the inner surfaces of the first and second component discs and having radially inner ends and radially outer ends, with all of the radially inner and outer ends of the elongated fins being free of circumferential interconnection, with air being allowed to radially pass freely between circumferentially adjacent elongated fins between the inner and outer edges of the first and second component discs, with the elongated fins being equally circumferentially spaced and extending in non-radial directions between the first and second component discs; and a mounting ring integrally formed with the elongated fins intermediate and axially spaced from each of the first and second component discs and radially inward of the inner edges of the first and second component discs.