Demonstration magazine for camera

Claim 1

IN A DEMONSTRATION MAGAZINE FOR A CAMERA OF THE TYPE HAVING A WEB ADVANCE MECHANISM MOVABLE INTO AND OUT OF DRIVING ENGAGING WITH A TAKE-UP SPOOL OF SAID MAGAZINE, THE COMBINATION COMPRISING: A BODY HAVING A FIRST HUB MEMBER SECURED THERETO AT ONE END OF SAID BODY, SAID FIRST HUB MEMBER HAVING (1) A FIRST BORE AT ONE END, (2) A FIRST CYLINDRICAL SHOULDER OF ONE DIAMETER HAVING AN AXIALLY EXTENDING FIRST SLOT THEREIN, AND (3) A SECOND CYLINDRICAL SHOULDER OF GREATER DIAMETER; A SUPPLY SPOOL ROTATABLY SUPPORTED AT SAID ONE END OF SAID BODY; SAID SUPPLY SPOOL HAVING A WEB WOUND THEREON WITH ONE END CONNECTED TO SAID SUPPLY SPOOL; SAID SUPPLY SPOOL COMPRISING A SECOND HUB MEMBER HAVING (1) A STUB SHAFT AT ONE END ROTATABLY SUPPORTED BY SAID BODY IN AXIAL ALIGNMENT WITH SAID FIRST HUB MEMBER, (2) A SECOND BORE AT ITS OTHER END IN AXIAL ALIGNMENT WITH SAID FIRST BORE, AND (3) A THIRD CYLINDRICAL SHOULDER OF SUBSTANTIALLY THE SAME DIAMETER AS SAID FIRST SHOULDER AND HAVING AN AXIALLY EXTENDING SECOND SLOT THEREIN; SAID SUPPLY SPOOL FURTHER COMPRISING A DRUM HAVING ONE END ROTATABLY MOUNTED ON SAID SECOND SHOULDER, AND ITS OTHER END SECURED TO SAID SECOND HUB MEMBER; A TAKE-UP SPOOL ROTATABLY SUPPORTED AT THE OTHER END OF SAID BODY, AND HAVING THE OPPOSITE END OF SAID WEB SECURED THERETO; AND A SPRING POSITIONED WITHIN SAID DRUM AND HAVING ONE END ENCIRCLING SAID FIRST SHOULDER WITH A PART OF SAID END EXTENDING INTO SAID FIRST SLOT, AND SAID OTHER END OF SAID SPRING ENCIRCLING SAID THIRD SHOULDER WITH A PART OF SAID END EXTENDING INTO SAID SECOND SLOT, SAID SPRING ADAPTED TO BE TENSIONED WHEN SAID WEB ADVANCE MECHANISM IS MOVED INTO DRIVING ENGAGEMENT WITH SAID TAKE-UP SPOOL FOR DRIVING SAID TAKE-UP AND SUPPLY SPOOLS IN ONE DIRECTION TO ADVANCE SAID WB FROM SAID SUPPLY SPOOL ONTO SAID TAKE-UP SPOOL, SAID TENSIONED SPRING AUTOMATICALLY ROTATING SAID DRUM IN THE OPPOSITE DIRECTION TO REWIND SAID WEB ONTO SAID SUPPLY SPOOL WHEN SAID WEB ADVANCED MECHANISM IS MOVED OUT OF DRIVING ENGAGEMENT WITH SAID TAKE-UP SPOOL.