Combination sound reproducing and slide projecting apparatus

Claim 1

IN A COMBINED SOUND REPRODUCER AND SLIDE PROJECTOR: A BASE; A TURNTABLE THEREON FOR ROTATING A DISC RECORD HAVING A SPIRAL RECORD GROOVE; AN INDEXING CARRIAGE HAVING MEANS FOR SUPPORTING THE SAME ON SAID RECORD AND FOR RECEIVING FRICTIONAL DRIVE THEREFROM, SAID CARRIAGE INCLUDING A SECTOR HAVING INTERNAL STOP TEETH SPIRALLY ARRANGED SUCCESSIVELY CLOSER TO THE ROTATIONAL AXIS OF THE TURNTABLE; A TONE ARM MOVABLE ABOVE SAID CARRIAGE, SAID TONE ARM HAVING A STYLUS FOR FOLLOWING SAID GROOVE AND A STOP PIN FOR ENGAGEMENT SUCCESSIVELY WITH SAID STOP TEETH AND RELEASABLE THEREFROM IN SUCCESSION BY RADIALLY INWARD MOVEMENT RESPONSIVE TO THE FOLLOWING OF SAID GROOVE BY SAID STYLUS SO AS TO FREE SAID CARRIAGE FOR INDEXING MOVEMENTS EACH OF WHICH IS ARRESTED BY ENGAGEMENT OF A SUCCEEDING TOOTH AGAINST THE STOP PIN; SAID CARRIAGE HAVING MEANS FOR ATTACHING THERETO AN ARCUATE STRIP HAVING A ROW OF TRANSPARENCIES THEREIN; A PROJECTOR MOUNTED ON SAID BASE FOR PRODUCING A LIGHT BEAM WHICH IS SUCCESSIVELY REGISTERED WITH THE RESPECTIVE TRANSPARENCIES BY THE INDEXING MOVEMENTS OF SAID CARRIAGE; AND MEANS PROVIDING A LOST-MOTION DRIVING CONNECTION BETWEEN SAID TONE ARM AND SAID STOP PIN SUCH THAT IN ESCAPING FROM A STOP TOOTH SAID STOP PIN MAY SHIFT TOWARD THE ROTATIONAL AXIS IN RESPONSE TO CAMMING ACTION OF THE PIN AGAINST THE POINT OF THE TOOTH WITHOUT TRANSMITTING THROUGH THE TONE ARM, ANY RADIAL FORCE SUCH AS WOULD TEND TO DISLODGE SAID STYLUS FROM SAID GROOVE.