Shielded switch device

Claim 1

A LINE SELECTOR SWITCH FOR A CLOSED-CIRCUIT DISTRIBUTION SYSTEM FOR TELEVISION SIGNALS AND THE LIKE OF THE TYPE HAVING A PLURALITY OF SIGNAL-CARRYING TRANSMISSION LINES, AN INPUT LINE AND A PLURALITY OF TERMINATING IMPEDANCES ASSOCIATED WITH THE TRANSMISSION LINES, SAID SWITCH HAVING A PLURALITY OF PREDETERMINED SWITCH POSITIONS FOR SELECTIVELY CONNECTING THE INPUT LINE TO ONE TRANSMISSION LINE AND FOR CONNECTING THE UNUSED TRANSMISSION LINES TO THE TERMINATING IMPEDANCES ASSOCIATED THEREWITH, SAID SWITCH COMPRISING A GROUP OF FIXED ACTIVE CONTACTS ADAPTED TO BE CONNECTED TO SAID LINES, SAID CONTACTS BEING CIRCULARLY ARRANGED SO THAT SAID SWITCH POSITIONS ARE SPACED A PREDETERMINED ANGULAR DISTANCE APART; A GROUP OF FIXED SHIELD CONTACTS BEING CIRCULARLY ARRANGED AND BEING INTERSPERSED WITH SAID ACTIVE CONTACTS, SO THAT SAID ACTIVE CONTACTS ARE SEPARATED FROM EACH OTHER BY AT LEAST ONE SHIELD CONTACT; ROTATABLE ACTIVE SWITCH ARM MEANS FOR SIMULTANEOUSLY CONNECTING PREDETERMINED ONES OF SAID TRANSMISSION LINE AND INPUT LINE ACTIVE CONTACTS IN EACH OF SAID SWITCH POSITIONS, SAID SWITCH ARM MEANS BEING ARCUATE IN SHAPE AND EXTENDING OVER SAID PREDETERMINED ANGULAR DISTANCE; SHIELD SWITCH ARM MEANS ARRANGED FOR