Patent ID: 8177524

Claim:
Apparatus for securing and selectively releasing a piston pump from a drive assembly comprising: a first collar segment and a second collar segment, each sized and positioned to cooperate with each other to receive and retain and selectively release an elongated piston pump cylinder with respect to the drive assembly, wherein the cylinder is configured to movably retain a piston and has a longitudinal axis, and the first collar segment is in fixed relationship to the drive assembly and movement of the second collar segment is constrained such that the second collar is movable only linearly transversely with respect to the longitudinal axis of the cylinder when the cylinder is retained to the drive assembly; and wherein the second collar segment retains the piston pump cylinder to the drive assembly when the second collar segment is in a first position and wherein the second collar segment releases the piston pump cylinder from the drive assembly when the second collar segment is in a second position spaced transversely away from the first collar segment.