Concrete hose shut-off valve
US6817591B2 · kind B2 · utility
1Cited by
11References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2002 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Feb 7, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G2021/049
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A shut off valve for use with a concrete delivery hose includes a pair of flexible cylindrical sleeves disposed within a rigid casing that surrounds the hose. A gas chamber is defined between the sleeves so that when pressurized gas is forced into the chamber the inner sleeve will be displaced radially inwardly to constrict the hose and stop the flow of concrete.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.