Hydraulic paint pump
OwnerJohn D. Geberth, Jr.inventor
Life of this patent
Estimating the term…
Abstract
There is provided an improved airless paint spray pump having an intake, an inlet valve assembly, a pumping chamber, an outlet, an outlet valve assembly, and stroke pumping means for pumping the fluid paint into the pumping chamber through the intake during the intake stroke and through the outlet on the pumping stroke. The inlet valve assembly includes a flat valve which cooperates with a valve seat at the intake and is displaced from the valve seat during the intake stroke of the pumping means and is seated on the valve seat during the pumping stroke of the pumping means. The flat inlet valve replaces the previous ball type inlet or check valve thereby expanding the design capabilities of the pump.
Claims14
An airless paint spray pump for pumping fluid paint to be sprayed to a pressure sufficient for hydraulic atomization thereof, said pump comprising:
- (a) a reciprocating piston and cylinder assembly, said piston being a stepped piston forming larger and smaller piston parts reciprocable within said cylinder and defining together therewith a first pumping chamber defined by said larger piston part and a second pumping chamber defined by said smaller piston part;
- (b) a pump inlet for said fluid paint centrally disposed in said first pumping chamber;
- (c) a pump outlet for said pressurized fluid paint in said second pumping chamber;
- (d) an inlet valve assembly including a circular flat valve in said first pumping chamber and a valve seat therefor centrally disposed at said pump inlet, said flat valve having at least three radially outwardly extending stops which center said valve in said cylinder and with respect to said valve seat;
- (e) a valve retainer formed in the wall of said cylinder in said first pumping chamber adapted to engage the radially outwardly extending stops of said flat valve so as to limit the movement thereof in said cylinder;
- and
- (f) a transfer valve assembly between said first and second pumping chambers which permits the fluid paint to be pumped from said first chamber into said second chamber.
Dependencies are inferred from the claim text.