Projector slide changer and shutter control

Claim 1

SLIDE CHANGING AND SHUTTER CONTROL MECHANISM FOR SLIDE PROJECTORS COMPRIISNG: A PROJECTION SLIDE HAVING A LOCKING RECESS FORMED IN ONE SIDE THEREOF, GUIDE MEANS FOR GUIDING MOVEMENT OF SAID SLIDE BETWEEN A FIRST POSITION AND A SECOND POSITION, SHUTTLE MEANS MOVABLE BETWEEN SAID GUIDE MEANS FOR CARRYING SAID SLIDE, BELL CRANK MEANS PIVOTALLY MOUNTED ON SAID SHUTTLE AND HAVING A HOOK PORTION ENGAGEABLE WITH SAID RECESS, AN ARM MEMBER, FIRST LINK MEANS CONNECTING SAID ARM MEMBER WITH SAID BELL CRANK MEANS, RESILIENT MEANS BIASING SAID ARM MEMBER TO URGE SAID SHUTTLE TO SAID FIRST POSITION, ACTUATOR MEANS OPERABLE TO CAUSE SAID ARM MEMBER TO MOVE SAID SHUTTLE TO SAID SECOND POSITION, SHUTTER MEANS MOVABLE BETWEEN A LIGHT BLOCKING POSITION AND A LIGHT PASSING POSITION, MEANS URGING SAID SHUTER MEANS TO SAID LIGHT PASSING POSITION, SECOND LINK MEANS HAVING A PORTION ENGAGEABLE BY SAID ARM MEMBER AND OPERABLE BY SAID ARM MEMBER TO CAUSE SAID SHUTTER MEANS TO BE MOVED TO AND FROM SAID LIGHT BLOCKING POSITION, AND TRIGGER MEANS RESPONSIVE TO PRESENCE OF A SLIDE IN SAID GUIDE MEANS TO MOVE SAID SECOND LINK MEANS TO A POSITION WHERE SAID ARM MEMBER CAN ENGAGE SAID PORTION OF SAID SECOND LINK MEANS.