Elevator trench drain
US9777489B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2016 |
| Grant date | Oct 3, 2017 |
| Priority date | — |
| Expiry date | Sep 12, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F17/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An elevator trench drain includes a trench and a drain passageway. The trench has a base wall with peripheral side walls extending upwardly therefrom to define a trench volume therein. The drain passageway extends downwardly from the base wall of the trench and places the trench volume in fluid communication with a lower opening of the drain passageway. The drain passageway has a first section proximate the base wall defining a first cross-sectional area and a second section distal the base wall defining a second cross-sectional area. The second cross-sectional area is less than the first cross-sectional area and this reduction in cross-sectional area produces a head pressure that increases the flow out of the lower opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.