Batching apparatus for liquid or plastic substances

Claim 1

AN APPARATUS FOR BATCHING LIQUID OR PLASTIC SUBSTANCES OF THE TYPE COMPRISING A CYLINDER WHICH ENCLOSES AN AXIALLY DISPOSED PISTON FOR PORTIONING OUT THROUGH ONE CYLINDER END A SUBSTANCE WHICH IS FED IN CONTINUOUSLY VIA A SIDE INLET AT SAID CYLINDER END, A SLEEVE TIGHTLY ENCLOSING THE PISTON BUT AXIALLY DISPLACEABLE RELATIVE TO THE SAME WHICH SLEEVE UPON THE BEGINNING OF THE BATCHING OPERATION, WITH THE SLEEVE END ADJACENT THE WORKING END OF THE PISTON BEING SUBSTANTIALLY IN LEVEL WITH SAID WORKING END WHEN THE PISTON IS IN ITS RETRACTED POSITION PRIOR TO THE BEGINNING OF THE POWER STROKE, AND WITH THE CYLINDER SPACE BETWEEN THE PISTON END AND A CHECK VALVE DISPOSED IN THE CYLINDER END BEING FILLED WITH SUBSTANCE, IS DISPLACED FROM ITS STARTING POSITION INTO A POSITION OF SEALINGLY SHIELDING THE INLET, THE PISTON BEING ADAPTED IN CONNECTION THEREWITH TO BE DISPLACED FOR PRESSING OUT THE SUBSTANCE INCLUDED IN SAID SPACE THROUGH THE CHECK VALVE AND THEREAFTER TO BE RETURNED TOGETHER WITH THE SLEEVE TO THE STARTING POSITION FOR CARRYING OUT ANOTHER BATCHING OPERATION, A HELICAL SPRING ENCLOSING THE PISTON ABUTS WITH ONE END AGAINST A STOP ON THE PISTON AND WITH ITS OTHER END AGAINST A STOP ON THE SLEEVE, SO THAT WHEN THE SPRING IS FREE FROM TENSION THE SLEEVE PROJECTS BEYOND THE PISTON BY A DISTANCE SUFFICIENT FOR SAID SHIELDING, SAID SLEEVE BEING ADAPTED BY COMPRESSION OF THE SPRING TO BE PRESSED FROM ITS SHIELDING POSITION BACK AGAINST AN INTERMEDIATE STOP ON THE PISTON FOR PREPARING ANOTHER BATCHING OPERATION, SAID PISTON THEN BEING SEPARATELY FIXED IN ITS END POSITION WHEREIN THE OUTER END OF THE SLEEVE IS SUBSTANTIALLY IN LEVEL WITH THE PISTON END, AND DURING THE CONTINUED BACK-PRESSING MOVEMENT TO TAKE THE PISTON THEN SEPARATELY RELEASED ALONG INTO ITS STARTING POSITION.

Claim 2

AN APPARATUS FOR BATCHING LIQUID OR PLASTIC SUBSTANCES OF THE TYPE COMPRISING A CYLINDER WHICH ENCLOSES AN AXIALLY DISPOSED PISTON FOR PORTIONING OUT THROUGH ONE CYLINDER END A SUBSTANCE WHICH IS FED IN CONTINUOUSLY VIA A SIDE INLET AT SAID CYLINDER END, A SLEEVE TIGHTLY ENCLOSING THE PISTON BUT AXIALLY DISPLACEABLE RELATIVE TO THE SAME WHICH SLEEVE UPON THE BEGINNING OF THE BATCHING OPERATION, WITH THE SLEEVE END ADJACENT THE WORKING END OF THE PISTON BEING SUBSTANTIALLY IN LEVEL WITH SAID WORKING END WHEN THE PISTON IS IN ITS RETRACTED POSITION PRIOR TO THE BEGINNING OF THE POWER STROKE, AND WITH THE CYLINDER SPACE BETWEEN THE PISTON END AND A CHECK VALVE DISPOSED IN THE CYLINDER END BEING FILLED WITH SUBSTANCE, IS DISPLACED FROM ITS STARTING POSITION INTO A POSITION OF SEALINGLY SHIELDING THE INLET, THE PISTON BEING ADAPTED IN CONNECTION THEREWITH TO BE DISPLACED FOR PRESSING OUT THE SUBSTANCE INCLUDED IN SAID SPACE THROUGH THE CHECK VALVE AND THEREAFTER TO BE RETURNED TOGETHER WITH THE SLEEVE TO THE STARTING POSITION FOR CARRYING OUT ANOTHER BATCHING OPERATION, A HELICAL SPRING ENCLOSING THE PISTON ABUTS WITH ONE END AGAINST A STOP ON THE PISTON AND WITH ITS OTHER END AGAINST A STOP ON THE SLEEVE, SO THAT WHEN THE SPRING IS FREE FROM TENSION THE SLEEVE PROJECTS BEYOND THE PISTON BY A DISTANCE SUFFICIENT FOR SAID SHIELDING, SAID SLEEVE BEING ADAPTED BY COMPRESSION OF THE SPRING TO BE PRESSED FROM ITS SHIELDING POSITION BACK AGAINST AN INTERMEDIATE STOP ON THE PISTON FOR PREPARING ANOTHER BATCHING OPERATION, SAID PISTON THEN BEING SEPARATELY FIXED IN ITS END POSITION WHEREIN THE OUTER END OF THE SLEEVE IS SUBSTANTIALLY IN LEVEL WITH THE PISTON END, AND DURING THE CONTINUED BACK-PRESSING MOVEMENT TO TAKE THE PISTON THEN SEPARATELY RELEASED ALONG INTO ITS STARTING POSITION.