Patent ID: 7237694
Filing Date: 2007-07-03
Classification: B65B,G01F

Abstract:
1. A pump apparatus comprising: a cylinder for containing a piston and for forming a product chamber, said cylinder having a longitudinal axis, an inlet for receiving a product into said product chamber and an outlet for allowing said product chamber to be evacuated; a piston mounted in said cylinder and movable in a direction parallel to the longitudinal axis, said piston having a first longitudinally directed internal aperture, a second longitudinally directed internal aperture spaced from said first longitudinally directed internal aperture, a third longitudinally directed internal aperture spaced from said first and said second longitudinally directed internal apertures, and a laterally directed aperture, a valve mounted to reciprocate in said first longitudinally directed internal aperture of said piston, said valve having a first structure for engaging a source of motion to move said valve in a reciprocating manner, a second structure for connecting to said piston to selectively move said piston, and a third structure for providing communication with said second and said third longitudinally directed internal apertures of said piston, wherein during a cycle of movement of said piston and said valve, said valve moves together with said piston during a part of the cycle and said valve moves when said piston is stationary during another part of the cycle.