Patent ID: 7367366
Filing Date: 2008-05-06
Classification: F04B,F04F

Abstract:
1. A pumping device comprising: a container body having a bottom base adapted to fix on a fixture surface and an open top to which a cover structure is mounted; a support frame arranged inside the container body, a piston shaft being formed in the frame, a piston being movably received in the shaft and coupled to a piston rod which has a free end extending beyond the cover structure for manual operation; a first channel defined in the bottom of the container body and having an inner end in fluid communication with the piston shaft with an inner check valve therebetween, the first channel having an outer end to which an outer check valve is mounted; a second channel defined in the cover structure and connected to the outer check valve by a conduit that is connected to the second channel by a first slide switch; an air inlet valve comprising a base formed on the cover structure and defining a T-shaped air channel having a transverse passage in which a control handle is movably received, the control handle forming at least one recesses which is positionable to selectively open and close the T-shaped air channel; a third channel defined in the cover structure and spaced from the second channel, the third channel having a first end to which a combination of second slide switch and vacuum generator is mounted and an opposite second end to which a pressurized air control valve is mounted; a floater switch arranged inside the container body and connected to the third channel; and wherein by selectively setting the air inlet valve and the first slide switch, air is selectively drawn into and expelled out of the container body to selectively increase and decrease internal pressure of the container body, which in turn sucks oil into the container body or drains oil out of the container body through an opening defined in the cover structure; and wherein by selectively setting the first and second slide switches to supply pressurized air to the container body, internal pressure of the container body is selectively increased and decreased to suck oil into the container body or drain oil out of the container body through the opening defined in the cover structure.