Fluid pulsing means for print hammers

Claim 1

APPARATUS FOR CONVERTING FLUID ENERGY OF RELATIVELY LONG DURATION INTO IMPULSE ENERGY OF RELATIVELY SHORT DURATION, WHICH COMPRISES IN COMBINATION: AN ELONGATED FLUID IMPERVIOUS CHAMBER HAVING A WALL AT AT LEAST ONE END THEREOF FOR PREVENTING THE ESCAPE OF FLUID THEREFROM; A PISTON MEMBER OF PREDETERMINED MASS AND HAVING FIRST AND SECOND OPPOSED END SURFACES WHICH IS SLIDABLY DISPOSED WITHIN SAID CHAMBER WITH ITS SAID FIRST END SURFACE FACING SAID CHAMBER ONE END WALL SO THAT THERE IS SUBSTANTIALLY NO FLUID LEAKAGE BETWEEN SAID CHAMBER AND SAID PISTON MEMBER, SAID PISTON MEMBER BEING MOVABLE BETWEEN PREDETERMINED MAXIMUM AND MINIMUM DISTANCES WITH RESPECT TO SAID CHAMBER ONE END WALL SO AS TO VARY THE CHAMBER VOLUME BETWEEN IT AND SAID CHAMBER ONE END WALL BETWEEN PREDETERMINED MAXIMUM AND MINIMUM VOLUME VALUES; A PRESSURIZED BODY OF COMPRESSIBLE FLUID OCCUPYING SAID CHAMBER VOLUME; A MOVABLE MECHANICAL FORCE TRANSMITTING MEMBER EXTENDING THROUGH SAID CHAMBER AT SAID ONE END SO AS TO BE IN FLUID COMMUNICATION WITH SAID CHAMBER VOLUME WITHOUT PERMITTING ANY SUBSTANTIAL ESCAPE OF FLUID THEREFROM, AND WHICH IS NORMALLY BIASED TO A REST POSITION BUT MOVABLE THEREFROM IN RESPONSE TO COMPRESSIBLE FLUID PRESSURE ONLY WHEN BELOW A FIRST CHAMBER VOLUME VALUE GREATER THAN SAID MINIMUM VOLUME VALUE BUT LESS THAN ONE-FOURTH OF SAID MAXIMUM VOLUME VALUE; AND FLUID SOURCE MEANS FOR SELECTIVELY APPLYING FOR A PREDETERMINED TIME PERIOD MOTIVE FLUID OF PREDETERMINED PRESSURE AGAINST SAID PISTON MEMBER SECOND END SURFACE SO AS TO IMPART MOMENTUM THERETO IN THE DIRECTION OF SAID CHAMBER ONE END WALL, WHERE SAID MOTIVE FLUID PRESSURE, SAID PISTON MEMBER MASS, SAID PREDETERMINED DISTANCES, AND SAID PREDETERMINED TIME PERIOD ARE SUCH, RELATIVE TO ONE ANOTHER, THAT APPLICATION OF SAID MOTIVE FLUID TO SAID PISTON MEMBER WHEN AT SAID MAXIMUM DISTANCE FROM SAID CHAMBER ONE END WALL CAUSES SAID PISTON MEMBER TO HAVE MOMENTUM IN THE DIRECTION TOWARD SAID CHAMBER ONE END WALL SUFFICIENT TO CREATE A SECOND CHAMBER VOLUME VALUE LESS THAN SAID FIRST CHAMBER VOLUME VALUE.