Suction cup device

A suction cup device comprising:

• a suction cup including a disk portion having a deformable abutment surface configured to adhere to a support surface, and a cup body connected to said disk portion and surrounding an axis, said cup body defining a chamber, and having a plug hole communicating with said chamber;
• a plug member movably disposed in said plug hole;
• a cover unit including a positioning seat airtightly connected to and covering said cup body, a pressing member movably inserted into said positioning seat, an air storage space cooperatively defined by said positioning seat, said pressing member and said cup body, and an air vent channel communicating said air storage space with an ambient environment, said air storage space having a variable volume and communicable with said chamber through said plug member, said positioning seat having a tubular shape and including a peripheral wall surrounding the axis, and a retaining ring connected to one end of said peripheral wall and defining a through hole, said pressing member being inserted into said positioning seat through said through hole, at least a portion of said pressing member being exposed from said positioning seat, said pressing member including an annular stop portion protruding from an outer peripheral surface thereof;
• and
• a manual air vent valve disposed on said pressing member, and including a protruding ring protruding from said outer peripheral surface of said pressing member and integrally formed as one piece with said annular stop portion, an annular flange protruding outwardly and transversely from an end of said pressing member and spaced apart from said protruding ring, an annular groove formed between said protruding ring and said annular flange, an airtight ring disposed in said annular groove, and a plurality of angularly spaced-apart flow guide holes extending through said protruding ring and said annular stop portion and communicating with said annular groove and said through hole;
• said protruding ring having an annular face facing said annular groove, said annular flange having an annular face facing said annular groove and said annular face of said protruding ring;
• and
• said airtight ring having a circular cross section, and a diameter smaller than a width of said annular groove measured in a direction transverse to the axis such that said airtight ring is movable in said annular groove along the axis between a first position, where said airtight ring airtightly abuts against said annular face of said annular flange to close communication between said air storage space and said air vent channel, and a second position, where said airtight ring is moved away from said annular face of said annular flange to open the communication between said air storage space and said air vent channel;
• said manual air vent valve being movable along with said pressing member to switch said air vent channel between a closed state, where said air storage space is sealed, and an open state, where air in said air storage space is released to the ambient environment through said air vent channel.