Cyclic pump

A cyclic pump for incompressible fluids, comprising:

• a fixed support;
• a first cylinder attached to said fixed support;
• a first piston movable through said first cylinder;
• a first piston pump, comprising:
• a first cylinder, a first piston having an end in said first cylinder and movable through said first cylinder and defining in said first cylinder beyond said end of said first piston a first pump chamber;
• a first inlet to and a first outlet from said first pump chamber;
• a second piston pump comprising:
• a second cylinder, a second piston having an end in said second cylinder;
• said second piston being attached to said support;
• said second cylinder being movable with respect to said second piston such that the second piston moves through said second cylinder and said second piston defining in said second cylinder beyond said end of said second piston a second pump chamber;
• a second inlet to and a second outlet from said second pump chamber;
• a conduit directly connected between said first outlet and said second inlet whereby said first pump chamber pumps to and fills said second pump chamber under pressure;
• a first cam follower attached to said first piston such that movement of said first cam follower in one direction moves said first piston in one direction and wherein said one direction of movement of said first piston is the direction of movement thereof out of said first cylinder, thereby enlarging the volume of said first pump chamber for drawing fluid therein;
• a second cam follower attached to said second cylinder, such that movement of said second cam follower in a second direction moves said second cylinder in said second direction which is the direction moving said second piston into said second cylinder, and movement of said second cylinder in said second direction moves said second cylinder with respect to said second piston to reduce the volume of said second pump chamber and pump fluid therefrom through said second outlet;
• a cam carried by said support;
• cam moving means connected with said cam for moving said cam into engagement with said first cam follower and for continuing to move said cam once it is in engagement with said first cam follower to move said first cam follower in said one direction;
• said cam moving also moving said cam into position to move said second cam follower and after causing such movement of said cam continuing to move said second cam follower in said second direction;
• said cam, said first cam follower and said second cam follower being so shaped, positioned and connected such that said first cam follower motion in said one direction and said second cam follower motion in said second direction occurs simultaneously;
• biasing means connected with said first piston for acting in opposition to the motion caused by said first cam follower in said one direction, thereby to cause said first piston to move in a direction opposite said one direction, thereby to pump fluid from said first pump chamber;
• a flow control fitting having an inlet connected into said conduit between said first outlet and said second inlet and having a flow restriction therein, said flow control fitting being for diverting away from said second inlet a portion of the output through said first outlet;
• the relative sizes of said first and said second pump chambers and the distances traveled by said first and said second cam followers being related such that in each cycle of said first and said second pumps, said first pump is capable of pumping more fluid than said second pump.