Abstract: A suction cup is provided, including: a suction member, a first check valve and a second check valve. The suction member includes a seat body, a control member movably disposed on the seat body, a first flow channel and a second flow channel. The seat body includes a seat portion and a cup portion which is elastically deformable and disposed on the seat portion. The seat body has a first gas chamber, and a second gas chamber is defined between the control member and the seat body. The first flow channel is communicated with first gas chamber and the second gas chamber. The first check valve is disposed within the first flow channel and openably closes the first flow channel. The second check valve is disposed within the second flow channel, openably closes the second flow channel.

Abstract: A suction cup is provided, including: a suction member, a first check valve and a second check valve. The suction member includes a seat body, a control member movably disposed on the seat body, a first flow channel and a second flow channel. The seat body includes a seat portion and a cup portion which is elastically deformable and disposed on the seat portion. The seat body has a first gas chamber, and a second gas chamber is defined between the control member and the seat body. The first flow channel is communicated with first gas chamber and the second gas chamber. The first check valve is disposed within the first flow channel and openably closes the first flow channel. The second check valve is disposed within the second flow channel, openably closes the second flow channel.

Abstract: A suction cup is provided, including: a suction member, including a seat body, a control member movably disposed on the seat body and a cup portion disposed on the seat body, the suction member further including a first air chamber, a second air chamber, a flow channel, an outlet channel and an inlet channel, the flow channel communicating with the first and second air chambers, the outlet channel communicating with the first air chamber, the control member including an air-tight ring portion, the air-tight ring portion openably closing and blocking the outlet channel, the inlet channel communicating with the second air chamber and the atmosphere; a check valve, disposed within the flow channel, openably closing the flow channel and allowing air to flow from the second air chamber to the first air chamber; a pressure relief valve portion, openably sealing and blocking the inlet channel.

Abstract: 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.