Pump

Claim 1

A FLUID PUMP FOR DISPLACING FLUIDS AT A UNIFORM SLOW RATE, SAID PUMP COMPRISING A HOUSING HAVING A CHAMBER THEREIN, A FIRST ONE-WAY VALVE IN COMMUNICATION WITH SAID CHAMBER FOR ALLOWING FLUID BEING PUMPED TO ENTER SAID CHAMBER, A SECOND ONE-WAY VALVE IN COMMUNICATION WITH SAID CHAMBER FOR ALLOWING FLUID BEING PUMPED TO LEAVE SAID CHAMBER, A COMPRESSIBLE BODY FOR DISPLACING FLUID FROM SAID CHAMBER AS SAID BODY IS BEING COMPRESSED, SAID COMPRESSIBLE BODY COMPRISING A NORMALLY EXPANDED BELLOWS HAVING A SINGLE OPENING IN COMMUNICATION WITH SAID CHAMBER, MEANS FOR COMPRESSING SAID BELLOWS AT A UNIFORM RATE, SAID FIRST AND SECOND VALVES EACH COMPRISING A GENERALLY TUBULAR BODY HAVING A LONGITUDINAL PERFORATION SEALED AT ONE END, A LATERAL PASSAGE CONNECTING SAID PERFORATION WITH THE EXTERIOR OF SAID BODY, AND A FLEXIBLE RESILIENT SLEEVE PLACED IN TENSION OVER SAID BODY TO COVER THE MOUTH OF SAID PASSAGE, SAID SLEEVE STRETCHING TO PROVIDE A SPACE BETWEEN THE INNER WALL OF SAID SLEEVE AND THE OUTER WALL OF SAID BODY WHEN THE PRESSURE INSIDE SAID PASSAGE BECOMES GREATER THAN THE PRESSURE OUTSIDE SAID SLEEVE THEREBY PERMITTING FLUID TO PASS FROM WITHIN SAID VALVE TO WITHOUT SAID VALVE.