Piston type dispenser

Claim 1

A DISPENSING PACKAGE DEVICE, WHICH CAN BE FILLED AND STORED OR SHIPPED IN COMPACT OR COLLAPSED CONDITION AND THEN READILY ACTIVATED FOR US, OF THE TYPE HAVING A CYLINDRICAL BARREL WITH A DISPENSING OPENING AT THE FORWARD END THEREOF, COMPRISING, PISTON MEANS WITHIN SAID BARREL ADAPTED WHEN MOVED AXIALLY TO SWEEP AND EXTRUDE THE CONTENTS OF SAID BARREL OUT OF THE DISPENSING OPENING THEREOF, A PISTON-ACTUATING SHAFT EXTENDING FROM OUTSIDE THE REAR END OF SAID BARREL, WITH RESPECT TO THE FORWARD END THEREOF, INTO SAID BARREL AND AT LEAST ABOUT TO THE DISPENSING OPENING AT THE FORWARD END, SAID PISTON MEANS HAVING A CENTRAL OPENING THEREIN THROUGH WHICH SAID PISTON-ACTUATING SHAFT EXTENDS AND SUBSTANTIALLY FILLS OR CLOSES, PUSHER MEANS HAVING A SMOOTH FRONT SURFACE OF SMALLER DIAMETER THAN THE PISTON MEANS AND HAVING A RIM, A CENTRAL OPENING IN SAID PUSHER MEANS WITH A REARWARDLY EXTENDING COLLAR SURROUNDING THE OPENING IN SAID PUSHER MEANS, AT LEAST ONE SPRING ELEMENT COMPRESSIVELY RETAINED BETWEEN THE RIM AND THE COLLAR, SAID COLLAR HAVING AN OPENING TO ADMIT A PORTION OF THE SPRING TO EXTEND INTO THE INTERIOR PORTION OF SAID COLLAR SO AS TO PARTIALLY BLOCK THE CENTRAL OPENING IN SAID PUSHER MEANS WHEN FREE TO MOVE THEREIN, SAID PUSHER MEANS BEING POSITIONED BETWEEN AT LEAST A PORTION OF SAID PISTON MEANS AND THE REAR END OF SAID BARREL, SAID PISTON-ACTUATING SHAFT ALSO CONTAINING A FEMALE GROOVED FORMATION ADAPTED TO RECEIVE THE SPRING ELEMENT OF SAID PUSHER MEANS, SAID GROOVED FORMATION BEING ADJACENT TO BUT SPACED FROM THE FORWARD END OF SAID ACTUATING SHAFT, WHEREBY SAID FILLED DEVICE MAY BE MADE READY FOR DISPENSING BY WITHDRAWING SAID PISTON-ACTUATING SHAFT UNTIL THE SPRING ELEMENT OF SAID PUSHER MEANS SNAPS ONTO SAID GROOVED FORMATION TO PROVIDE A PLUNGER TO ACTUATE SAID PISTON MEANS.