Flexible electrical switch post

Claim 1

IN COMBINATION WITH A MACHINE HAVING A FIXED MEMBER AND A MEMBER SPACED FROM AND MOVABLE RELATIVE TO THE FIXED MEMBER, SAID MOVABLE MEMBER HAVING AN APERTURE THEREIN ADAPTED TO RECEIVE AND CARRY AN ARTICLE TO BE OPERATED UPON BY THE MACHINE, A DEVICE FOR SENSING THE PRESENCE OR ABSENCE OF THE ARTICLE IN SAID APERTURE AT A GIVEN STATION ON THE FIXED MEMBER, SAID SENSING DEVICE COMPRISING A FLEXIBLE RESILIENT TUBE, A HEAD MEMBER COMPRISING A FLANGE EXTENDING LATERALLY BEYOND THE PERIPHERY OF THE TUBE OUT OF THE PATH OF MOVEMENT OF A PORTION OS MEMBER AND IN THE PATH OF MOVEMENT OF A PORTION OF AN ARTICLE DISPOSED IN SAID APERTURE AND SUPPORTED BY THE MOVABLE MEMBER, SAID PORTION EXTENDING BEYOND THE APERTURE INTO AN OPEN AREA ADJACENT THE MOVABLE MEMBER, A PIN OF ELECTRICAL CONDUCTING MATERIAL SECURED TO AND CARRIED BY THE HEAD MEMBER AND EXTENDING INTO THE PATH OF MOVEMENT OF THE MOVABLE MEMBER, A BASE BLOCK OF AN ELECTRICAL CONDUCTING MATERIAL SECURED TO THE OTHER END