Drive mechanism for a stopper in a molten metal vessel
US5421559A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1994 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Apr 13, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D41/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A stopper drive mechanism is removably mounted on a molten metal vessel having a discharge opening and is adapted to move a stopper into and out of closing engagement with the discharge opening. A piston and cylinder unit of the stopper drive mechanism is operably connected with the stopper and has a valve unit connected thereto for controlling the piston and cylinder unit. The piston and cylinder unit comprises a cylinder that defines a working chamber with a piston slidably disposed therein. The piston has the same effective working area on opposite sides thereof. The valve unit comprises a control valve for controlling the flow of hydraulic fluid to and from the opposite sides of the piston and a bypass valve that is adapted to selectively communicate opposite sides of the piston with each other for manual movement of the stopper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.