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US 4,679,989 AGranted
Pump shovel bulk unloader
AssigneeGraco Inc.
InventorsCharles E. Harriman, Donald S. Nii
Life of this patent
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Abstract
An air-operated reciprocating pump is designed for use with a wide variety of materials having widely varying viscosities. The pump has a stroke which is adjustable so that the piston can operate either entirely within the cylinder or can extend out the bottom end of the cylinder at the end of the stroke for materials having an extremely high viscosity. The stroke adjustment is easily accessible in the area between the pump and the air motor.
Claims7
A pump for pressurizing and transporting materials of varying viscosity, said pump comprising:
- a cylinder having an open bottom end;
- a piston reciprocally located in said cylinder and having top and bottom surfaces;
- a reciprocating source of power;
- a connecting rod connecting said piston and said power source, said piston oscillating between top and bottom positions;
- and
- means for adjusting the bottom position of said piston between a first position wherein said piston is located in said cylinder and a second position wherein said piston extends outside said open bottom end.
3 more elements
Dependencies are inferred from the claim text.