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Elbow pipe for electric conduit

  • US 4,730,855 A
  • Filed: 02/24/1982
  • Issued: 03/15/1988
  • Est. Priority Date: 04/15/1981
  • Status: Expired due to Fees
First Claim
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1. A unitary functionally integral elbow pipe joint for use in a pipe system for housing electrical wiring, cable or conductors comprising:

  • (a) a gradually curved impervious pipe section extending initially from the inlet of said section at an angle of 0°

    to the outlet thereof at 90°

    ;

    (b) a plurality of identically shaped cylindrical rollers rotatably mounted along the inner surface of the inner curvature of said intermediate section;

    (c) said rollers being so arranged and mounted that a portion of the cylindrical surface of each of said rollers protrudes slightly into the interior of said curved pipe section without significantly reducing the effective interior cross-sectional area of said curved pipe section;

    (d) one of said rollers being mounted contiguous to said inlet and another of said rollers being mounted contiguous to said outlet;

    (e) at least one additional roller mounted along the inner curvature of said curved section of said pipe section and disposed between said rollers mounted at the said outlet and inlet and being spaced therefrom at least a distance equal to the diameter of said rollers;

    (f) the number of said rollers being so selected to allow improved conveyance of an electrical conductor through said section with minimal force; and

    (g) the inner surface of said pipe section being so shaped to accomodate said remaining portions of the cylindrical surfaces of each of said plurality of rollers.

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