Lateral member assembly for underdrain lateral system
US5618426A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1995 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Jun 15, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2201/4084
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Lateral member assembly for use in an underdrain lateral distribution system is made of plastics but is as capable as much heavier and more costly prior art metallic assemblies in supporting a bed of filter media which must be periodically backwashed with liquid and gas. Complementary elements, including a rigid extruded floor plate member having longitudinally extending side edge channels, and an overlying screen member having flange portions adapted to be retained by undercut recesses in the side edge channels, are adapted to be assembled to each other to form hollow lateral assemblies. In a preferred embodiment, the screen member is telescopically assembled to the floor plate member to cause the screen flange portions to interlock with the recesses in the side edge channels. The resulting assembly is sealed against leakage where the members are interlocked by a pair of flexible, integral plastic sealing strips which are co-extruded with the rigid floor plate member. In an alternative arrangement, the flange portions of the screen members engage a cam surface on the floor plate member which forces them away from each other as the screen member is pressed down against the floor pl…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.