Vacuum actuated switch and hold-in device

Claim 1

SWITCH ACTUATING AND HOLD-IN APPARATUS FOR USE WITH MAGNETIC TAPE REELS ADAPTED TO HAVE WRITE LOCKOUT MEANS MOUNTED THEREON DURING READ-OUT IN A TAPE TRANSPORT HAVING A VACUUM PUMP, SAID APPARATUS COMPRISING, CYLINDER MEANS HAVING AN OPEN MOUTH, MEANS FOR MOUNTING SAID CYLINDER MEANS IN THE TAPE TRANSPORT SO THAT SAID OPEN MOUTH FACES THE WRITE LOCKOUT RING TO A TAPE REEL OPERATIVELY POSITIONED IN THE TAPE TRANSPORT, SAID MOUNTING MEANS BEING POSITIONED AT THE END OF SAID CYLINDER MEANS OPPOSITE FROM SAID MOUTH, PIN MEANS CARRIED SLIDABLY BY SAID MOUNTING MEANS AND HAVING A FORWARD END PROJECTING OUT OF SAID CYLINDER MEANS THROUGH SAID OPEN MOUTH, THE FORWARD END OF SAID PIN MEANS ENGAGEABLE AND MOVABLE BY THE TAPE MOUNTED WRITE LOCKOUT RING FROM AN INITIAL POSITION TO AN INTERMEDIATE POSITION, PISTON MEANS FIXEDLY MOUNTED ON SAID PIN MEANS TO BE SPACED FORWARDLY OF SAID OPEN MOUTH WHEN SAID PIN MEANS IS IN SAID INITIAL POSITION, SWITCH OPERATING MEANS FIXED ON THE REAR END OF SAID PIN MEANS, AND MEANS FOR EFFECTING FLUID COMMUNICATION THROUGH SAID CYLINDER MEANS AND SAID MOUNTING MEANS TO A VACUUM PUMP OF THE TRANSPORT WHEREBY SAID PIN MEANS AND SAID PISTON IS DRAWN INTO SAID CYLINDER AWAY FROM THE WRITE LOCKOUT RING TO A FINAL POSITION BY SAID VACUUM PUMP.