Corrugated leaching chamber with hollow ribbing
US5716163A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1995 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Mar 10, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2519/00407
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Large leaching chambers having hollow ribs are formed by gas assisted injection molding. The ribs have stepped cross sections with hollow bases and narrower solid upper parts. When the chamber wall is corrugated, as characterizes a typical arch shape cross section leaching conduit, hollow ribs on opposing sides of the wall are positioned to connect to each by means of holes in the undulating walls. Hollow ribs are narrowed along their length and where they interconnect, alleviating problems distortion and shrinkage problems. And, the chamber wall which surrounds the injection molding sprue is thinner than the typical wall, to avoid hollowing there.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.