Patent ID: 6722855
Filing Date: 2004-04-20
Classification: F04B,F04F,Y10T

Abstract:
An oil pumping device comprising a housing having an oil reserving space defined therein, a floating board being disposed in the oil reserving space, an upper cover being disposed on the housing and equipped with a manual air sucking mechanism, a pneumatic air sucking mechanism and an oil sucking tube, said pneumatic air sucking mechanism including an air sucking passage defined in the upper cover and having an opening extending into the oil reserving space, several stop plates being disposed in an inner periphery of the air sucking passage at intervals, the pneumatic air sucking mechanism being provided with a controlling unit, when the controlling unit is opened, the oil reserving space communicating with the pneumatic air sucking mechanism, whereby the pneumatic air sucking mechanism is capable of sucking air out of the oil reserving space for pumping oil, when the controlling unit is closed, the oil reserving space being disconnected from the pneumatic air sucking mechanism, whereby the manual air sucking mechanism is operable for pumping oil, wherein the improvement comprises:the controlling unit including: a seat body disposed at the opening of the air sucking passage, a movement space being defined between the seat body and the air sucking passage, one side of the seat body distal from the air sucking passage being formed with a through hole communicating with the movement space; a valve body disposed in the movement space for selectively close the through hole due to the gravity thereof; a sleeve connected to the seat body opposite to the air sucking passage, the sleeve having multiple inlets defined therein and radially extending through the sleeve, a hole defined in one end of the sleeve distal from the seat body; and a movable block longitudinally movably received in the sleeve, the movable block having a projecting post extending through the hole in the sleeve and into the reserving space, the movable block including an end face having a push pin upwardly extending therefrom and corresponding to the through hole of the seat body, an outer diameter of the push pin being smaller than an inner diameter of the through hole, whereby the air in the oil reserving can flow through the gap between the push pin and the an inner periphery of the through hole, a leakproof washer mounted around the push pin for selectively sealing the through hole in the seat body the push pin pushing away the valve body when the projecting post of the movable block is upward pushed by the floating board to make the leakproof washer seal the through hole in the seat body.