Stackable riser for on-site waste and drainage systems

  • US 5,617,679 A
  • Filed: 12/29/1994
  • Issued: 04/08/1997
  • Est. Priority Date: 12/29/1994
  • Status: Expired due to Term
First Claim
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1. A stackable riser comprising:

  • a continuous peripheral side wall having outer and inner surfaces and having a first free edge portion which defines a first end opening and having a second edge portion, said side wall extending in a substantially perpendicular direction with respect to a horizontal plane;

    a general inverted U-shaped connecting member extending from said second edge portion of said side wall and defining an oppositely-facing second end opening, said U-shaped connecting member including a transverse intermediate portion and first and second generally perpendicular dependent legs which define a channel between said dependent legs which is shaped to receive a first free edge portion of another riser; and

    a plurality of vertically-extending inner ribs positioned on said inner surface of said side wall, said inner ribs positioned on said inner surface of said side wall, said inner ribs including terminal edges which form shoulders positioned a predetermined distance away from a tip of said first free edge portion of said side wall.

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