Ventilator apparatus

In ventilator apparatus adapted for mounting on a building structure to exhaust air from the building structure, and including conduit means defining an air flow passage, an electric motor having a rotor shaft, a rotor supported by the rotor shaft for rotation of the rotor shaft with rotation of said rotor, a blower impeller driven by said rotor shaft and disposed generally within said conduit means, and closure means movable between a closed position and an open position for controlling air flow through said passage, the improvement comprising means supporting said rotor shaft and the rotor for axial movement in response to energization of said electric motor, and means operably connected to said rotor shaft for moving said closure means between said closed and open positions in response to axial movement of said rotor shaft and said rotor.

Ventilator apparatus adapted to be attached to the upper portion of a building to exhaust air therefrom through an opening therein comprising:

• an annular shroud encompassing the opening and having a base portion attached to the building, an electric motor coaxial with the annular shroud, support means attaching the electric motor to the shroud, the electric motor having an electrically energizable stator and a rotor, the rotor being rotatable and axially movable with respect to the stator with electric energization of the stator, a shaft attached to the rotor for rotative and axial movement therewith, a fan member encompassed by the shroud and attached to the shaft for rotative and axial movement therewith, a closure member concentric with the shroud and attached to the shaft for rotative and axial movement therewith, the closure member being movable from a position adjacent the shroud to a position spaced from the shroud with axial movement of the shaft with axial movement of the rotor, rotation of the rotor thus causing rotation of the fan member for forcing movement of air from within the building and outwardly therefrom through the opening therein and through the shroud, the air moving from the shroud between the closure member and the shroud.

Ventilator apparatus adapted to be attached to the upper portion of a building to exhaust air therefrom through an opening therein comprising:

• an annular shroud encompassing the opening and having a base portion attached to the building, an electric motor concentric with the annular shroud, support means attaching the electric motor to the shroud, the electric motor having an electrically energizable stator and a rotor, the rotor being rotatable and axially movable with respect to the stator with electrical energization of the stator, a shaft attached to the rotor for rotative and axial movement therewith, a closure member exterior of the shroud and attached to the shaft for rotative and axial movement therewith, the closure member being axially movable from a position adjacent the shroud to a position spaced from the shroud with axial movement of the shaft with axial movement of the rotor, the closure member having an inner surface and an outer surface, fan means adjacent each surface of the closure member for rotation therewith, the closure member moving axially with axial movement of the rotor, the closure member and the fan means thus rotating with rotation of the rotor for movement of air through the shroud.

In ventilator apparatus of the type provided with an annular shroud, a fan encompassed by the shroud, an electric motor connected to the fan for rotation thereof, the combination in which the electric motor includes a stator member and a rotor member which are relatively rotatably and axially movable by electro-magnetic forces created within the stator member and the rotor member, closure means adjacent the shroud, means joining the closure means to one of said members for axial movement of the closure means with axial movement thereof, the closure means being in a normal inactive position in substantial closing relationship to the shroud,

• the closure means when moved axially being positioned in spaced relationship from the shroud to provide a passage for movement of air between the shroud and the closure means during rotation of the fan.

Ventilator apparatus adapted to be attached to the upper portion of a building to exhaust air therefrom through an opening therein comprising:

• an annular shroud encompassing the opening and having a base portion attached to the building, an electric motor concentric with the annular shroud, support means attaching the electric motor to the shroud, the electric motor having an electrically energizable stator and a rotor, the rotor being rotatably and axially movable with respect to the stator with electrical energization of the stator, air control means including fan means and shroud closure means, means attaching the air control means to the rotor for rotative and axial movement therewith, the air control means being movable from a closed position with respect to the shroud to an open position with respect to the shroud with axial movement of the rotor of the electric motor, the air control means when in the open position rotating with the rotor for movement of air through the shroud and providing an opening between the shroud and the air control means for flow of air from the shroud.

Ventilator apparatus of the type provided with annular air duct means, a fan member rotatable within the annular air duct means, electric motor means for operation of the fan member, the improvement comprising:

• a closure member having a closed position with respect to the air duct means, the closure member having an open position with respect to the air duct means, the electric motor means including a rotor element and a stator element in which there is relative rotative and axial movement between the rotor and the stator upon electrical energization of the stator, means operably connected to one of said elements for moving the closure member from its closed position to its open position with respect to the air duct means with relative axial movement between the rotor and the stator.