Patent ID: 7572189

Claim:
A structure used to raise persons by use of air jets, comprising: a flight position ( 3 ; 5 ); a jet generating device ( 1 ) associated with the flight position and generating a vertical air jet, the jet generating device comprising i) a suction-and-delivery conduit ( 4 ) having a suction inlet and a delivery outlet, the delivery outlet vertically arranged and ending in proximity of the flight position ( 3 ; 5 ), and ii) a variable pitch propeller, the propeller driven by an electric motor machine powered from an electric energy supply source, the propeller located inside said suction-and-delivery conduit ( 4 ), the propeller drawing air into the suction inlet, generating a vertically upward directed air jet, and discharging the air jet from the delivery outlet; a support structure ( 2 ) supporting the flight position and the jet generating device; one of an elastic membrane and net ( 3 ) provided at the flight position ( 3 ; 5 ) and arranged above the delivery outlet, said one of the elastic membrane and the net being sufficiently permeable to air to permit passage of the air jet; an inverter connected between the electric motor and the electric energy supply source, said inverter configured to vary a frequency of electric current supplied to the electric motor; and a balance ( 7 ) for determining a weight of a person to be raised over the flight position by the air jet discharged from the delivery outlet, the balance electronically generating an electric signal proportional to the determined weight, said electric signal connected to control the inverter to modify the frequency of the electric current supplied to the electric motor, thereby reaching a maximum number of rpm of the variable pitch propeller ( 6 ) for the determined weight of the person, corresponding to a suitable air jet to raise the person up to a maximum pre-set height.