Patent ID: 8540495

Claim:
A dual duty hand pump, comprising: a hand grip; a pump body being hollow and having: a through hole formed through one end of the pump body and adapted to communicate with outside of the pump body; and an air inlet and an air outlet channel through the other end of the pump body and adapted to communicate with outside of the pump body; a piston rod mounted in the pump body and through the through hole of the pump body, wherein one end of the piston rod is connected with the hand grip; a piston securely mounted on the other end of the piston rod and having a seal ring sealed against an inner wall of the pump body; a deflating unit mounted in the air inlet channel and having: a check valve through which air flows in a first direction, the check valve having: a valve seat being hollow and having a valve gate formed on and protruding radially from an inner wall of the valve seat to partition an inner space of the valve seat into an upper compartment and a lower compartment; an air vent cover mounted in the upper compartment and having: an air vent hole formed through the air vent cover; and multiple stoppers formed on and protruding from one side of the air vent cover facing the valve gate, and spaced with an interval between each other; and a valve plate movably mounted between the stoppers and the valve gate; and a connection ring securely mounted in the air inlet channel, being adjacent to a bottom opening of the air inlet channel, and having a threaded hole adapted to engage an air pin; an inflating unit mounted in the air outlet channel and having: a check valve through which air flows in a second direction opposite to the first direction; and a connection ring securely mounted in the air outlet channel, being adjacent to a bottom opening of the air outlet channel, and having a threaded hole adapted to engage an air pin.