Apparatus for installing electrical wire in electrical conduit

Claim 1

PNEUMATIC CORD THREADING APPARATUS FOR THREADING A WIRE PULLING CORD THROUGH AN ELECTRICAL CONDUIT, COMPRISING, A BLOWER HAVING AN OUTLET THROUGH WHICH THE BLOWER FORCES AIR AT A HIGH RATE UNDER PRESSURE, A FLEXIBLE AIR SUPPLY HOSE CONNECTABLE WITH SAID BLOWER OUTLET TO RECEIVE AIR UNDER PRESSURE FROM THE LATTER, A TUBULAR AIR SUPPLY FITTING DEFINING AN INTERNAL AIR PASSAGE FOR TRANSMITTING AIR THERETHROUGH, SAID FITTING HAVING A GENERALLY RIGHT ANGLE BEND IN THE MEDICAL PORTION THEREOF AND TWO LEGS OF MATERIALLY UNEQUAL LENGTH EXTENDING FROM THE BEND, THE OUTER END OF EACH LEG BEING DIMENSIONED TO FIT INTO THE OUTLET END OF SAID HOSE AND HAVING MEANS ENCIRCLING THE ADJACENT END OF SAID AIR PASSAGE TO FORM A SEAL BETWEEN THE LATTER AND THE OUTLET END OF THE HOSE, A CENTRALLY OPEN SEALING RING SHAPED AND DIMENSIONED TO FIT IN DETACHABLE ENCIRCLING RELATION TO THE OUTER END OF EITHER OF SAID FITTING LEGS TO FORM A SEAL THEREWITH, SAID SEALING RING DEFINING AN OUTWARDLY FACING SEALING SURFACE OF FRUSTO-CONICAL SHAPE ADAPTED TO FIT AGAINST AND FORM A SEAL WITH THE END OF AN ELECTRICAL CONDUIT WHEN THE SEALING RING ENCIRCLES THE END OF THE FITTING OPPOSITE FROM SAID HOSE, SAID FITTING DEFINING IN SAID BEND THEREIN TWO APERTURES ALIGNED WITH SEGMENTS OF SAID AIR PASSAGE IN SAID RESPECTIVE FITTING LEGS, EACH OF SAID APERTURES OPENING OUTWARDLY TO RECEIVE WIRE PULLING CORD FROM A SUPPLY OF CORD LOCATED OUTSIDE THE FITTING AND HOUSE AND SUPPORTED INDEPENDENTLY OF THE FITTING AND HOSE, EACH OF