Insulated fan for electric appliance

{
  "publication_number": "US4147470A",
  "country": "US",
  "kind": "A",
  "title": "Insulated fan for electric appliance",
  "abstract": "A fan and motor assembly for an electric appliance, wherein the fan is comprised of a plastic material and has a mounting hole of a diameter greater than the shaft diameter of the motor. Insulating washers closely fitted in annular recesses at the end of the mounting hole have inner diameters substantially the same as that of the shaft for centering the fan on the shaft.",
  "claims": [
    "1. In a fan for a vacuum cleaner, wherein the fan has a base portion including a hub, and a plurality of fins extending from said base portion, and a coaxial mounting hole extending through said hub, the improvement wherein said base portion and fins comprise a unitary member of a plastic material, said hub having an annular recess at each end of said mounting hole and coaxial with said hole, and a separate flat thermally insulating washer mounted in each said recess with a close fit, said washers having inner diameters less than that of said mounting hole and thicknesses greater than the depths of said recesses.",
    "2. The fan of claim 1, wherein said fan is comprised of a polycarbonate material.",
    "3. The fan of claim 1 wherein said base portion of said fan further includes a disc extending radially outwardly from said hub, said fins extending from one side of said disc in planes parallel to the axis of said fan.",
    "4. In a fan and motor assembly for a vacuum cleaner, wherein the fan has a base portion with a hub, and a plurality of fins extending from said base portion, said hub has a coaxial mounting hole, said motor has a shaft extending through said hole, and means including a pulley are provided for holding said hub on said shaft, the improvement wherein said base portion is comprised of a plastic material, said hub has an annular recess at each end of said mounting hole, said hole has a diameter greater than the diameter of said shaft whereby an annular space is formed therebetween and further comprising an insulating washer mounted in each of said annular recesses and having inner diameters engaging said shaft for centering said hub on said shaft said base portion and fins of said fan comprising a unitary molded plastic body, one of said washers engaging said pulley and separating said pulley from said fan.",
    "5. The fan and motor assembly of claim 4 wherein said base portion of said fan further comprises a disc having a generally flat outer periphery and a curved inner portion extending radially inwardly to join said hub, said fins extending from a side surface of said disc in planes parallel to and substantially equally spaced from the access of said hub."
  ],
  "cpc": [
    "F04D 29/281",
    "F04D 29/263"
  ],
  "assignees": [
    "NAT UNION ELECTRIC CORP"
  ],
  "filing_date": "1977-01-31",
  "publication_date": "1979-04-03",
  "grant_date": "1979-04-03",
  "priority_date": "1977-01-31",
  "application_number": "US-76380377-A",
  "family_id": "25068853",
  "citations": [
    "DE1017320B",
    "DE427135C",
    "US2428728A",
    "US2438866A",
    "US2836348A",
    "US3387768A",
    "US3521973A",
    "US3622249A",
    "US3659471A",
    "US3749519A",
    "US3846045A",
    "US3932062A"
  ]
}