Semi-liquid cementitious spray nozzle apparatus
US4796814A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Sep 9, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB28C5/026
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A semi-liquid cementitious pump nozzle unit for pumping cement, concrete, grout and other abrasive materials includes an air chamber assembly having an outer integral swivel housing. A tubular steel body has a threaded coupling for connection to a pump hose. An air chamber recess extends about the nozzle body with transfer openings located centrally of the recess. An outer air housing in a form of a simple tubular member is telescoped over the end walls and sealed thereto by O-ring seals. The opposite ends of the housing are smooth bearing surfaces. Annular bearing walls project radially outwardly by the nozzle and abutting the bearing surfaces of the housing. The bearing walls may be snap ring units releasably applied to the nozzle body. A nozzle reducer secured to the end of the nozzle body may have an appropriate end directly abutting the air/swivel housing to form a bearing wall. The outer air/swivel housing is secured with the body for a slip fit for ease of disassembly, cleaning and maintenance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.