Paper clip has rolling element movable between spaced apart and clipping positions relative to flat supporting surface

摘要

The clip has a housing with an opening, a flat supporting surface, a rolling element movable between spaced apart and clipping positions, and a close surface fronting the supporting surface. Sheets of paper are lodged between the rolling element and the supporting surface, as the rolling element moves across the close surface to the clipping position. The close surface has acute angles of 5 to 30 or 10 to 20 degrees.