Apparatus including rotary drum means for testing a plurality of electrical circuits

Claim 1

APPARATUS FOR SEQUENTIALLY TESTING A PLURALITY OF ELECTRICAL CONDUCTORS FOR ISOLATION FROM AN ELECTRICALLY CONDUCTIVE ENCLOSURE COMPRISING, A SOURCE OF TEST CURRENT CONNECTED AT ON SIDE TO GROUND, A PLURALITY OF CONNECTING POSTS, SAID CONNECTING POSTS BEING ELECTRICALLY ISOLATED FROM EACH OTHER, EACH SAID CONNECTING POST BEING ARRANGED TO RECEIVE A ONE OF SAID CONDITIONS TO BE TESTED, A CIRCUIT INCLUDING A SELECTOR SWITCH HAVING A PLURALITY OF CONTACT POINTS, EACH SAID CONTACT POINT BEING CONNECTED WITH AN ASSOCIATED CONNECTING POST, A TEST INDICATOR CONNECTED TO SAID SOURCE AND IN SERIES WITH SAID SELECTOR SWITCH, A RECEPTACLE CONNECTABLE WITH SAID CONDUCTIVE ENCLOSURE TO THEREBY CONNECT SAID ENCLOSURE TO GROUND, A ROTARY DRUM, MEANS FOR ROTATING SAID DRUM, SAID DRUM HAVING A PLURALITY OF ELECTRICALLY CONDUCTIVE BARS THEREON CONNECTED TO GROUND, A PLURALITY OF CONTACT ELEMENTS ARRANGED IN ALIGNMENT TO BE ENGAGED SUCCESSIVELY BY SAID BARS AS SAID DRUM IS ROTATED, SAID CONTACT ELEMENTS BEING EACH CONNECTED TO AN INDIVIDUAL ONE OF SAID CONNECTING POSTS, MEANS FOR DIRECTING CURRENT FROM THE OPPOSITE SIDE OF SAID CURRENT SOURCE THROUGH SAID TEST INDICATOR AND SAID SELECTOR SWITCH TO SAID CONTACT ELEMENTS TO TEST SAID CONDUCTORS FOR ISOLATION, SAID SELECTOR SWTICH BEING OPERABLE TO DIRECT CURRENT TO EACH OF SAID CONDUCTORS SEQUENTIALLY FOR TESTING, SAID BARS BEING OPERABLE THROUGH PERIODIC CONTACT WITH SAID CONTACT ELEMENTS FOR PERIODICALLY ENERGIZE AND DEENERGIZE SAID CIRCUIT TO THEREBY INTERMITTENTLY ACTUATE SAID INDICATOR WHEN A CONDUCTOR UNDER TEST IS ISOLATED FROM SAID ENCLOSURE, SAID INDICATOR BEING ACTUATED CONTINUOUSLY BY CURRENT LEAKAGE ACROSS SAID ENCLOSURE TO GROUND WHEN SAID CONDUCTOR UNDER TEST IS IN ELECTRICAL CONTACT WITH SAID ENCLOSURE.