Motion picture viewer

Claim 1

A VIEWER COMPRISING: A CASING; AN EYE PIECE PRESENTED BY SAID CASING AND HAVING AN APERTURE THROUGH WHICH FILM IS ADAPTED TO BE VIEWED; GUIDE MEANS FOR GUIDING SAID FILM PAST SAID APERTURE; A SUPPLY REEL GEAR ROTATABLY MOUNTED ON SAID CASING; A FILM SUPPLY REEL COUPLED FOR ROTATION WITH SAID SUPPLY REEL GEAR FOR MOUNTING SAID FILM; A TAKE-UP REEL GEAR ROTATABLY MOUNTED ON SAID CASING A TAKE-UP REEL COUPLED FOR ROTATION WITH SAID TAKE-UP REEL GEAR FOR RECEIVING SAID FILM AS IT IS GUIDED PAST SAID APERTURE; DRIVE MEANS FOR SELECTIVELY DRIVING SAID TAKE-UP REEL AND SAID SUPPLY REEL FOR RESPECTIVELY WINDING SAID FILM ON SAID TAKE-UP REEL AND REWINDING SAID FILM ON SAID SUPPLY REEL, SAID DRIVE MEANS INCLUDING A ROTATABLY DRIVEN FLOATING GEAR MOUNTED ON SAID CASING AND HAVING EXTERNAL AND INTERNAL GEAR TEETH, SAID FLOATING GEAR BEING SHIFTABLE ALONG A PREDETERMINED PATH BETWEEN A FIRST DRIVE POSITION AT WHICH THE EXTERNAL TEETH MESH WITH SAID TAKE-UP REEL GEAR TO DRIVE SAID TAKE-UP REEL AND A SECOND POSITION AT WHICH THE EXTERNAL TEETH MESH WITH SAID SUPPLY REEL GEAR TO DRIVE SAID SUPPLY REEL; A STATIONARY PINION GEAR ROTATABLY MOUNTED ON SAID CASING AND ENGAGED WITH THE INTERNAL GEAR TEETH OF SAID SHIFTABLE GEAR; MEANS FOR ROTATABLY DRIVING SAID PINION GEAR; AND THE INTERNAL GEAR TEETH OF SAID SHIFTABLE GEAR BEING SO CONSTRUCTED AND ARRANGED THAT UPON ROTATION OF THE STATIONARY PINION GEAR IN ONE DIRECTION THE SHIFTABLE GEAR SHIFTS INTO ENGAGEMENT WITH THE TAKE-UP REEL GEAR AND UPON ROTATION OF SAID STATIONARY PINION GEAR IN THE OTHER DIRECTION THE SHIFTABLE GEAR SHIFTS TO ENGAGE THE SUPPLY REEL GEAR TO RESPECTIVELY DRIVE SAID TAKE-UP REEL AND SAID SUPPLY REEL.