Vacuum cleaner hose having electrical conductors

Claim 1

IN A SUCTION HOSE HAVING PER UNIT LENGTH A GIVEN NUMBER OF TURNS OF REINFORCING WIRE AT A GIVEN PITCH THE IMPROVEMENT COMPRISING AT LEAST THREE COAXIALLY ARRANGED MULTI-TURN HELICAL REINFORCING COILS HAVING SAID GIVEN NUMBER OF TURNS PER UNIT LENGTH OF HOSE AND EXTENDING THE LENGTH OF SAID HOSE, EACH SAID HELICAL COIL HAVING ITS TURNS SERIALLY INTERSPERSED WITH THE TURNS OF THE OTHER HELICAL COILS THEREBY DEFINING ADJACENT COAXIALLY ARRANGED TURNS OF REINFORCING WIRE HAVING AN APPARENT PITCH SUBSTANTIALLY EQUAL TO SAID GIVEN PITCH, AN AIRTIGHT CARCASS SURROUNDING SAID HELICAL COILS, SAID CARCASS EXTENDING RADIALLY INWARDLY BETWEEN THE ADJACENT INDIVIDUAL REINFORCING WIRES FOR FORMING ON THE OUTSIDE OF THE HOSE CARCASS A SERIES OF DISCRETE COAXIALLY ARRANGED HELICAL GROOVES, SAID GROOVES HAVING A PITCH WHICH IS GREATER THAN SAID APPARENT PITCH BY A MULTIPLE EQUAL TO THE NUMBER OF SAID REINFORCING WIRES, A PLURALITY OF ELECTRIC CONDUCTORS, EACH CONDUCTOR OF SAID PLURALITY BEING LOCATED IN A DIFFERENT ONE OF SAID HELICAL GROOVES, THE NUMBER OF SAID CONDUCTORS BEING LESS THAN THE NUMBER OF SAID GROOVES.