Switch operating unit

Claim 1

IN A ROTARY SELECT OPERATING UNIT, THE COMBINATION INCLUDING A SUPPORT HAVING AN OPENING, FIRST AND SECOND MEMBERS, SAID FIRST MEMBER JOURNALLED IN SAID SUPPORT FOR ROTATION RELATIVE TO SAID SUPPORT AND SAID SECOND MEMBER, SAID FIRST MEMBER HAVING A CENTRAL PROJECTION EXTENDING INTO SAID OPENING, SAID SECOND MEMBER BEING POSITIONED BETWEEN SAID FIRST MEMBER AND SAID OPENING, A SEALING MEMBER ENGAGING SAID CENTRAL PROJECTION AND SAID SUPPORT ADJACENT SAID OPENING, A RETAINER FOR SAID SEALING MEMBER POSITIONED BETWEEN SAID SEALING MEMBER AND SAID SECOND MEMBER, A DETENT BALL CARRIED BY ONE OF SAID MEMBERS WITH A PORTION OF SAID BALL ALWAYS EXTENDING ABOVE THE SURFACE OF SAID ONE MEMBER TOWARD SAID OTHER MEMBER, THE OTHER OF SAID MEMBERS HAVING A SERIES OF RECESSES POSITIONED TO SELECTIVELY RECEIVE SAID PORTION OF SAID DETENT BALL AS SAID FIRST MEMBER IS ROTATED AND A SPRING COMPRESSED BETWEEN SAID SECOND MEMBER AND SAID RETAINER HOLDING SAID RETAINER IN CONTACT WITH SAID SEALING MEMBER AND RESILIENTLY BIASING SECONF MEMBER TOWARD SAID FIRST MEMBER WHEREBY SAID FIRST MEMBER IS RESILIENTLY HELD IN VARIOUS ANGULAR POSITIONS, A DIFFERENT POSITION BEING ESTABLISHED EACH TIME SAID DETENT BALL IS RECEIVED IN A DIFFERENT RECESS OF SAID SERIES OF RECESSES OF SAID FIRST MEMBER IS ROTATED.