Slide projector apparatus with audio mechanisms

Claim 1

IN A SLIDE PROJECTOR OF THE TYPE ADAPED TO HOLD A SLIDE TRANSPARENCY MOUNTED IN A SLIDE HOLDER WITH THE SLIDE HOLDER CARRYING A CIRCULAR SOUND TRACK ON ONE FACE THEREOF SURROUNDING SAID TRANSPARENCY, AND MEANS FOR POSITIONING SAID HOLDER WITHIN SAID PRROJECTOR, THE IMPROVEMENT COMPRISING MEANS FOR RECORDING AND PLAYING BACK MATERIAL ON THE SOUND TRACK, INCLUDING A STATIONARY MEMBER DEFINIONG A CENTRAL OPENING, SAID STATIONARY MEMBER BEING POSITIONED IN AXIAL ALIGNMENT WITH THE PROJECTION LIGHT SOURCE AND THE TRANSPARENCY, A DRIVE ASEMBLY MOUNTED COAXIALLY WITH SAID STATIONARY MEMBER AND ROTATABLY DISPOSED THEREAROUND, MEANS FOR ROTATING SAID DRIVE ASSEMBLY, MEANS ON SAID DRIVE ASSEMBLY DEFINING A SPIRAL TRACK AND ROTATABLE THEREWITH, AN AUDIO HED, AN ARM MOUNTING SAID AUDIO HEAD ON SAID DRIVE ASSEMBLY AND PROVIDIDNG A FOLLOWER FOR ENGAGEMENT WITH SAID TRACK, AND MEANS INTEGRAL WITH SAID STATIONARY MEMBER AND COACTING WITH SAID DRIVE ASSEMBLY TO EFFECT RELATIVE MOVEMENT BETWEEN SAID FOLLOWER AND SAID SPIRAL TRACK, WHEREBY SAID AUDIO HEAD IS MOVED INTO ENGAGEMENT WITH SAID SOUND TRACK AND MOVED RADIALLY WITH RESPECT TO THE TUBULAR MEMBER AS IT ROTATES AROUND SAID SOUND TRACK.