US Patent 9803682 Suction cup device

A suction cup device includes a suction cup having a plug hole, a plug member movably disposed in the plug hole, a positioning seat connected to the suction cup, a pressing member movably inserted into the positioning seat, an air storage space defined by the positioning seat, the pressing member and the suction cup, and an air vent channel communicating the air storage space with an ambient environment. A manual air vent valve is disposed on and is movable along with said pressing member to switch the air vent channel between closed and open states, where the air storage space is sealed and air in the air storage space is released to the ambient environment through the air vent channel, respectively.