Patent ID: 6558138
Filing Date: 2003-05-06
Classification: F04B,Y10T

Abstract:
A manual/pneumatic oil-pumping device comprising: a housing having an upper cover, the upper cover being equipped with a manual mechanism and a pneumatic air sucking mechanism, the manual mechanism including a pump, a top and bottom ends of the pump being respectively sealed by the upper cover and a bottom of the housing, a piston being disposed in the pump, the piston having a piston stem provided with a handle where the piston stem extends through and out of the upper cover, an oil reserving space being defined between the pump and the housing, whereby when a user pushes the handle in and out to reciprocate the piston, an air in the oil reserving space is sucked into the pump and discharged so as to suck an oil into the oil reserving space, said oil-pumping device being characterized in that the upper cover is further provided with an air sucking port axially passing through the upper cover and communicating with the oil reserving space, the pneumatic air sucking mechanism being disposed to operate with the air sucking port, whereby the air can flow between the air sucking port and the interior of the pneumatic air sucking mechanism, a closing means being disposed in the air sucking port, whereby when pneumatically pumping the oil, the closing means is in an opened state and the air sucking port communicates with the oil reserving space so that the pneumatic air sucking mechanism can suck the air in the oil reserving space and thus suck an oil into the oil reserving space; and when manually pumping the oil, the closing means being in a closed state, the closing means automatically switched between closed state and opened state when converted between manual pumping and pneumatic pumping measures, the closing means including an accommodating member and a blocking body, the accommodating member having a bottom directed tapered conic hole passing through the accommodating member, the conic hole including a bottom end having a diameter smaller than that of an upper end of the conic hole, the blocking body being received in the conic hole and larger than the diameter of the bottom end of the conic hole, whereby in a normal state, the blocking body due to its own weight blocks the conic hole; and when pneumatically pumping the oil, the blocking body being sucked towards a stop, permitting the air sucking port to communicate with the oil reserving space.