Fluid pressure actuated motor having movement damping means

Claim 1

A DIFFERENTIAL PRESSURE MOTOR COMPRISING: A PAIR OF OPPOSED WALLS CLOSED BY A FLEXIBLE PORTION TO DEFINE A VARIABLE VOLUME CHAMBER SUCH THAT ONE OF SAID WALLS IS MOVABLE TOWARDS THE OTHER WHEN A PRESSURE DIFFERENTIAL IS CREATED ACROSS ONE OF SAID WALLS; A VALVE DEVICE OPERATIVELY CONNECTED TO SAID MOTOR TO MONITOR THE PRESSURE DIFFERENTIAL; A VACUUM SOURCE COMMUNICATION MEANS IN FLUID COMMUNICATION WITH SAID VALVE DEVICE WHOSE COMMUNICATION WITHIN SAID MOTOR IS MONITORED BY SAID VALVE DEVICE; A POSITIVE PRESSURE SOURCE DIFFERING FROM SAID VACUUM SOURCE, WHICH POSITIVE PRESSURE SOURCE IS IN FLUID COMMUNICATION WITH SAID VALVE DEVICE AND WHOSE COMMUNICATION WITHIN SAID MOTOR IS ALSO MONITORED BY SAID VALVE DEVICE; AND A PRESSURE DAMPING MEANS WITHIN SAID DIFFERENTIAL PRESSURE MOTOR INCLUDING A POROUS, COLLAPSIBLE MASS IN THE VARIABLE VOLUME CHAMBER BETWEEN THE OPPOSED WALLS, SAID POROUS, COLLAPSIBLE MASS HAVING THE PORES THEREOF OPEN TO THE INTERIOR OF SAID VARIABLE VOLUME CHAMBER TO PREVENT SUDDEN, ERRATIC MOVEMENT OF SAID ONE OF SAID WALLS TOWARD THE OTHER IN THAT THE POROUS COLLAPSIBLE NATURE OF THE MASS IS SUCH THAT THE EVACUATION OF ITS PORES REDUCES THE RATE OF OPERATION OF SAID MOTOR.