US Patent 9611884 Suction cup

A suction cup may comprise a cup body, a locating unit, a pressing unit, a rotating plate, a shell and a connecting unit. The cup body has a suction face and a rear face, and a central portion of the rear face comprises a stepped column. The pressing unit has an upper part, two lower parts, and a second through hole penetrates through a central portion of the upper part, and the rotating plate has a first surface and a second surface, and a central axle protrudes from a central portion of the first surface. The central axle passes through the second through hole of the pressing unit and then engages with the stepped column such that the upper part and the second through hole are configured to secure and prevent the central axle from swing or shifting due to the heavy load.