A rotary connector includes: a cylindrical fixed member defining an inner receiving portion; a rotary member rotatably concentrically mounted in the inner receiving portion defining an annular space in cooperation with the cylindrical fixed member; a spirally-wound flexible flat cable received in the annular space, wherein an outer periphery-side end of the flexible flat cable is fixed to the fixed member and a center-side end of the flexible flat cable is fixed to the rotary member; and a contact surface defining the annular space in cooperation with the cylindrical fixed member and the rotary member, wherein a portion of the contact surface adjacent to at least one of the cylindrical fixed member and the rotary member has a slanting surface slanting downwardly so that the flexible flat cable separates from a middle portion of the contact surface.

http://www.freepatentsonline.com/6508655.html