A blower/atomizer device, preferably of the portable type, comprising: - a propulsion assembly or power unit, adapted to generate a mechanical power; - a blowing assembly connected to said propulsion assembly and adapted to energise and convey an air flow - a flexible swingable dispenser defining a median axis and adapted to emit and direct a flow set in motion by the blowing assembly along said median axis; and - an adjusting assembly operatively acting in said swingable dispenser for selectively introducing a predetermined amount of substance "S" to be distributed/atomized, into said flow, wherein it further comprises: - a pumping unit operated by the power unit and adapted to cause movement of a substance to be distributed/atomized; and - contactless transmission means acting between the power unit or propulsion assembly, the blowing assembly and said pumping unit and adapted to actuate at least the pumping unit while maintaining a pneumatic and/or hydraulic separation relative to the power unit and/or the blowing assembly, wherein said contactless transmission means comprises: - an output shaft operatively connected to the power unit and preferably connected to a crank and connecting rod system of a reciprocating engine, said output shaft having a first end emerging from the power unit in the direction of the blowing assembly; - a fitting shaft operatively connected at least to the pumping unit, said fitting shaft having a second end facing said first end; - a magnetic driving element mounted on the first end of the output shaft; and - a magnetic driven element mounted on said second end of the fitting shaft and facing the magnetic driving element in such a manner as to create a magnetic attraction at least in one rotation direction of the output shaft under operating conditions, characterised in that said magnetic driving element and magnetic driven element have toroidal conformation and are disposed in coaxial and concentric relationship with each other. - a propulsion assembly or power unit, adapted to generate a mechanical power; - a blowing assembly connected to said propulsion assembly and adapted to energise and convey an air flow - a flexible swingable dispenser defining a median axis and adapted to emit and direct a flow set in motion by the blowing assembly along said median axis; and - an adjusting assembly operatively acting in said swingable dispenser for selectively introducing a predetermined amount of substance "S" to be distributed/atomized, into said flow, - a pumping unit operated by the power unit and adapted to cause movement of a substance to be distributed/atomized; and - contactless transmission means acting between the power unit or propulsion assembly, the blowing assembly and said pumping unit and adapted to actuate at least the pumping unit while maintaining a pneumatic and/or hydraulic separation relative to the power unit and/or the blowing assembly, - an output shaft operatively connected to the power unit and preferably connected to a crank and connecting rod system of a reciprocating engine, said output shaft having a first end emerging from the power unit in the direction of the blowing assembly; - a fitting shaft operatively connected at least to the pumping unit, said fitting shaft having a second end facing said first end; - a magnetic driving element mounted on the first end of the output shaft; and - a magnetic driven element mounted on said second end of the fitting shaft and facing the magnetic driving element in such a manner as to create a magnetic attraction at least in one rotation direction of the output shaft under operating conditions,