Risers for use with access openings in wastewater treatment...

Details Risers for use with access openings in wastewater treatment... Risers for use with access openings in wastewater treatment...

2011-04-19

2011-04-19

Hepperle, Stephen M (Department: 3753)

Fluid handling

With casing, support, protector or static constructional...

Static constructional installations

C137S584000, C052S020000, C405S133000, C405S134000

Reexamination Certificate

active

07926510

ABSTRACT:
A riser system for use at the access opening of a wastewater treatment tank includes an adaptor ring affixed to the top of the tank, and a mating riser. The adaptor ring and riser have ends with mating circumferential L-shape sections. There are horizontally projecting tabs spaced apart around the upper end of the adaptor. The tabs engage a corresponding number of L-shape slots which are spaced apart around the circumference of the bottom end of the riser. When ring and riser are mated, rotation of the riser relative to the adaptor causes each tab to move circumferentially to a recess in the slot, which locks the tab in position. Micro-ridges on horizontal mating surfaces of the L-shape sections help form a seal between the two parts.

REFERENCES:
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patent: 6688072 (2004-02-01), Gavin
patent: 2003/0145527 (2003-08-01), Meyers

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