Pulse generating apparatus

Claim 1

A PULSE GENERATOR FOR PROVIDING AN ELECTRICAL DIGITAL OUTPUT SIGNAL FROM A FLUID METER HAVING ITS OWN REGISTER OPERATED BY A SHAFT ROTATION PROPORTIONAL TO FLUID BEING METERED, SAID GENERATOR COMPRISING: (A) A HOUSING ADAPTED TO A SEALING CONNECTION ONTO AN OPEN SIDE OF THE FLUID METER AT A POSITION BETWEEN SAID METER AND SAID REGISTER, SAID HOUSING HAVING A TRAVERSE AUXILIARY PORTION EXTENDING OUT OF THE DIRECT VAPOR PATH BETWEEN SAID METER AND SAID REGISTER; (B) A DRIVE SPINDLE IN SAID HOUSING; (C) MEANS FOR DRIVING SAID SPINDLE IN ACCORD WITH ROTATION OF THE FLUID METER SHAFT; (D) MEANS INSIDE SAID HOUSING TRANSVERSE AUXILIARY PORTION AND RESPONSIVE TO ROTATION OF SAID SPINDLE FOR PRODUCTING AT LEAST 250 ELECTRICAL IMPULSES FOR EACH REVOLUTION OF SAID SPINDLE; (E) A FLAME PATH SEPARATING SAID TRANSVERSE AUXILIARY PORTION OF SAID HOUSING FROM THE REMAINDER OF SAID HOUSING, WHEREIN SAID SPINDLE EXTENDS ALONG SAID FLAME PATH THROUGH A BORE IN SAID AUXILIARY PORTION PROVIDING A 0.005-INCH MAXIMUM DIAMETRAL CLEARANCE FOR A DISTANCE OF AT LEAST 2 INCHES; AND (F) ELECTRICAL LEADS EXTENDING TO THE OUTSIDE OF SAID HOUSING FROM SAID TRANSVERSE PORTION.