Patent ID: 6331101
Filing Date: 2001-12-18
Classification: F04B

Abstract:
In a pump comprising at least two separate cylinder housings, each cylinder housing defining a cylinder with an axis, the axes being parallel and spaced apart; a pair of pistons, each piston being reciprocable in a corresponding one of the cylinders so as to reciprocate along the axis of the corresponding cylinder to vary a working volume of the cylinder; a motor positioned between the cylinder housings and driving the pistons so as to reciprocate the pistons; a head including a pair of head members, each head member being fastened to a different one of the cylinder housings; and said bead including at least one tube spanning the bead members, wherein the tube provides fluid communication between the head members; the improvement wherein:the motor is fixed between the cylinder housings without fasteners joining the motor to the cylinder housings, said motor being contained within a motor sleeve which is between said cylinder housings, and wherein said head holds said cylinder housings against said motor sleeve.