Maintenance provisions for pulse sequenced equipment

Claim 1

AN ARRANGEMENT FOR NORMALLY SUPPLYING INTERLACED TRAINS FOR REPETITIVE PULSES ON TWO OUTPUT LEADS WITH PROVISIONS FOR BLOCKING THE NORMAL REPETITIVE PULSES FROM THE OUTPUT LEADS AND FOR MANUALLY CONTROLLING THE SUPPLY OF A SINGLE PULSE TO EITHER OUTPUT LEAD UPON EACH OPERATION OF A MANUAL CONTROL CORRESPONDING TO THE PARTICULAR OUTPUT LEAD; SAID ARRANGEMENT COMPRISING A SOURCE OF CYCLICALLY RECURRING CLOCK PULSES ON FIRST AND SECOND INPUT LEADS, THE PULSES ON EACH LEAD OCCURRING DURING THE INTERPULSE INTERVAL OF THE OTHER LEAD AND HAVING THE SAME CYCLE TIME, SAID INPUT LEADS BEING COUPLED VIA FIRST AND SECOND INPUT PULSE GATES TO FIRST AND SECOND INTERMEDIATE LEADS RESPECTIVELY, AND SAID INTERMEDIATE LEADS BEING COUPLED VIA FIRST AND SECOND OUTPUT PULSE GATES TO FIRST AND SECOND OUTPUT LEADS RESPECTIVELY, EACH OF SAID PULSE GATES HAVING DIRECT CURRENT CONTROL MEANS NORMALLY ENABLED TO CAUSE THE GATES TO PASS ALL OF THE PULSES ON THE RESPECTIVE LEADS; MANUALLY CONTROLLED STOP MEANS COUPLED TO THE SAID DIRECT CURRENT CONTROL MEANS OPERATED TO BLOCK ALL FOUR OF SAID PULSE GATES; A SOURCE OF CYCLICALLY RECURRING TIMING PULSES HAVING A CYCLE TIME EQUAL TO SEVERAL OF SAID CLOCK PULSE CYCLES, EACH TIMING PULSE HAVING A DURATION AT LEAST EQUAL TO ONE PULSE CYCLE; SAID SOURCE OF TIMING PULSE BEING COUPLED TO THE DIRECT CURRENT CONTROL MEANS OF SAID INPUT PULSE GATES TO ENABLE THEM TO PASS ONLY ONE PULSE TO EACH SAID INTERMEDIATE LEAD DURING EACH TIMING PULSE CYCLE; FIRST AND SECOND BISTABLE DEVICES; FIRST AND SECOND MANUALLY CONTROLLED SWITCH MEANS FOR SELECTIVELY CONTROLLING THE SUPPLY OF ONLY ONE PULSE TO THE CORRESPONDING OUTPUT LEAD UPON EACH OPERATION OF ONE OF THESE SWITCH MEANS; SAID SWITCH MEANS AND SAID INTERMEDIATE MEANS BEING COUPLED TO SAID BISTABLE DEVICES TO SET THE ONE OF THE BISTABLE DEVICES CORRESPONDING TO AN OPERATED ONE OF THE SWITCH MEANS UPON THE OCCURRENCE OF A PULSE ON THE OPPOSITE INTERMEDIATE LEAD, THE OUTPUTS OF SAID BISTABLE DEVICES BEING COUPLED TO SAID DIRECT CURRENT CONTROL MEANS OF SAID OUTPUT PULSE GATES TO RESPOND TO ONE OF THE BISTABLE DEVICES BEING IN THE SET CONDITION WHILE THE OTHER IS IN THE RESET CONDITION TO ENABLE THE PULSE GATE CORRESPONDING TO THE BISTABLE DEVICE IN THE SET CONDITION TO PASS THE NEXT PULSE OCCURRING ON THE CORRESPONDING INTERMEDIATE LEAD TO THE CORRESPONDING OUTPUT LEAD, A CONNECTION FROM THE OUTPUT OF EACH BISTABLE DEVICE TO THE INPUT OF THE OPPOSITE BISTABLE DEVICE TO SET SAID OPPOSITE BISTABLE DEVICE UPON THE NEXT OCCURRENCE OF A PULSE ON SAID OPPOSITE INTERMEDIATE LEAD TO THEREBY BLOCK SAID OUTPUT PULSE GATES RESPONSIVE TO THE BISTABLE DEVICES BEING BOTH IN THE SAME CONDITION, AND MEANS RESPONSIVE TO RESTORATION TO NORMAL OF SAID SWITCH MEANS UPON THE OCCURRENCE OF A PULSE ON A GIVEN ONE OF SAID INTERMEDIATE LEADS TO RESET BOTH OF SAID BISTABLE DEVICES, WHEREBY FURTHER PULSES TO SAID OUTPUT LEADS ARE BLOCKED.