Motor-fan assembly for a floor cleaning machine

An improved motor-fan assembly for a floor cleaning appliance, the motor-fan assembly having a motor housing having an inner chamber, a motor contained in the inner chamber, a working air cavity, a motor cooling fan for drawing a cooling airstream into the inner chamber of the motor housing to cool the motor, a working air fan for drawing dirty working air into the working air cavity, a working air fan cover attached to the motor housing to seal the working air cavity, a motor cooling fan housing cover attached to the motor housing to seal the inner chamber through which the cooling airstream exits the motor housing, the improvement comprising:

• a plurality of slot shaped vent openings having parallel sides in the motor cooling fan housing cover.

An improved motor-fan assembly for a floor cleaning appliance, the motor-fan assembly having a motor housing having an inner chamber, a motor contained in the inner chamber, a working air cavity, a motor cooling fan for drawing a cooling airstream into the inner chamber of the motor housing to cool the motor, a working air fan for drawing dirty working air into the working air cavity, a working air fan cover attached to the motor housing to seal the working air cavity, a motor cooling fan housing cover attached to the motor housing to seal the inner chamber through which the cooling airstream exits the motor housing, the improvement comprising:

• a plurality of vent openings and a plurality of planar shaped vanes formed in said motor cooling fan housing cover wherein adjacent vent openings are separated by one of said plurality of vanes.

An improved motor-fan assembly for a floor cleaning appliance, the motor-fan assembly having a motor housing having an inner chamber, a motor contained in the inner chamber, a working air cavity, a motor cooling fan for drawing a cooling airstream into the inner chamber of the motor housing to cool the motor, a working air fan for drawing dirty working air into the working air cavity, a working air fan cover attached to the motor housing to seal the working air cavity, a motor cooling fan housing cover attached to the motor housing to seal the inner chamber through which the cooling airstream exits the motor housing, the improvement comprising a working air fan comprised of:

• a circular shaped back plate;
• a hub integrally formed with the back plate, and
• a plurality of curvilinear shaped fan blades integrally formed with said back plate projecting orthogonally upward from an upper surface of said back plate, said plurality of fan blades having a top edge and a trailing edge wherein said trailing edge projects orthogonally upward from said back plate and is parallel to an outer circumferential wall of the working air fan cover.

The improved motor-fan assembly of 28 wherein said plurality of long fan blades extend from said hub to an outer periphery of said back plate.

An improved impeller for a floor cleaning appliance, comprised of:

• a circular shaped back plate;
• a hub integrally formed with the back plate, and
• a plurality of curvilinear shaped fan blades integrally formed with said back plate and projecting orthogonally upward from an upper surface of said back plate, said plurality of fan blades being comprised of a plurality of long fan blades and a plurality of short fan blades in an alternating arrangement extending radially from said hub.