Patent ID: 6164924
Filing Date: 2000-12-26
Classification: F04B,F16N

Abstract:
A pump, comprising:a body having a chamber with a piston and a drive assembly to drive the piston positioned therein;the piston having a longitudinal axis, a first end, a second end, and a conduit for conducting a liquid from a position on the piston to the first end; andthe drive assembly including:a rotatable drive shaft;an eccentric cam insert positioned on the drive shaft;a cam rod positioned on the eccentric cam insert and having a shaft with a first end; anda rocking beam having an output end, an actuator end, a mid-section, and a pivot point; the output end of the rocking beam coupled to the second end of the piston, and the mid-section of the rocking beam coupled to the first end of the cam rod shaft;wherein when the drive shaft is rotated, the cam rod shaft is moved between a first shaft position and a second shaft position causing the rocking beam to pivot about the pivot point the output end of the rocking beam to move laterally with respect to the longitudinal axis of the piston, and the piston to move in correspondence to the rocking beam along a stroke.