CONICAL WALL RISER WITH INTERLEAVED TAB CONNECTORS
A plastic article useful as a riser assembly for a septic tank or as part of another structure is comprised of a multiplicity of identical shape conical wall plastic risers. The risers are attached to each other at joints by tabs which engage rim segments; each end of the riser has alternating tabs and rim segments. A riser assembly wall undulates in the lengthwise direction. The risers nest within each other for shipment or storage.
1 - 14 . (canceled)
15 . A riser for use in a riser assembly, wherein the riser comprises:
an angled wall connecting a first end and a second end spaced apart along a central lengthwise axis;
wherein the first end is circular and comprises:
a first diameter;
a first plurality of tabs spaced apart around a circumference of the first end, wherein each of the first plurality of tabs comprises angled circumferential direction-facing opposing ends and a radially extending lip; and
a first plurality of rim segments spaced apart around the circumference of the first end, wherein each of the first plurality of rim segments is positioned in a space between each of the first plurality of tabs;
wherein the second end is circular and comprises:
a second diameter;
a second plurality of tabs spaced apart around a circumference of the second end, wherein each of the second plurality of tabs comprises angled circumferential direction-facing opposing ends and a radially extending lip; and
a second plurality of rim segments spaced apart around the circumference of the second end, wherein each of the second plurality of rim segments is positioned in a space between each of the second plurality of tabs.
16 . The riser of claim 15 , wherein the first end of the riser is configured to mate to a first end of an identical second riser to form a joint between the first end of the riser and the first end of the identical second riser.
17 . The riser of claim 15 , wherein the second end of the riser is configured to mate to a second end of an identical second riser to form a joint between the second end of the riser and the second end of the identical second riser.
18 . The riser of claim 16 , wherein each of the first plurality of tabs of the first end are configured to engage with each of a plurality of rim segments of the identical second riser and each of the first plurality of rim segments of the first end are configured to engage with each of a plurality of tabs of the identical second riser.
19 . The riser of claim 17 , wherein each of the second plurality of tabs of the second end are configured to engage with each of a plurality of rim segments of the identical second riser and each of the second plurality of rim segments of the second end are configured to engage with each of a plurality of tabs of the identical second riser.
20 . The riser of claim 15 , wherein the second diameter is greater than the first diameter.
21 . The riser of claim 15 , further comprising an adapter configured to attach the riser to an opening of a tank.
22 . The riser of claim 21 , wherein the adapter comprises:
a first end comprising a flange extending outwardly from a central axis;
a second end comprising a cylindrical section; and
an intermediate section connecting the second end with the first end.
23 . The riser of claim 22 , wherein a diameter of the first end is greater than a diameter of the second end.
24 . The riser of claim 22 , wherein the first end further comprises a ledge extending inwardly towards the central axis.
25 . The riser of claim 24 , wherein a diameter of the ledge corresponds to a diameter of the plurality of second rim segments.
26 . The riser of claim 21 , wherein the adapter is configured to be screwed to a flange of the opening of the septic tank.