Patent Number: 7,611,122

Title: Closure device for the vacuum-tight closing of an opening in a wall

Abstract: A closure device for closing an opening in a wall in a vacuum-tight manner comprises a closure plate, a carrying unit which carries the closure plate and which has at least one longitudinal piston-cylinder unit, and a base unit which carries the carrying unit and has at least one transverse piston-cylinder unit. A closing cylinder space of the at least one longitudinal piston-cylinder unit is connected to a closing cylinder space of the transverse piston-cylinder unit, or of at least one of the transverse piston-cylinder units, by means of a closing pressure gas channel, and an opening cylinder space of the at least one longitudinal piston-cylinder unit is connected to an opening cylinder space of the transverse piston-cylinder unit, or of at least one of the transverse piston-cylinder units, by means of an opening pressure gas channel. The closing cylinder spaces and the opening cylinder spaces of the transverse piston-cylinder unit and longitudinal piston-cylinder unit are acted upon by pressure for closing the closure device, and only the opening cylinder spaces of the transverse piston-cylinder unit and longitudinal piston-cylinder unit are acted upon by pressure for opening the closure device. The closing piston surface of the at least one transverse piston-cylinder unit is greater than the opening piston surface of the at least one transverse piston-cylinder unit, and the closing piston surface of the at least one longitudinal piston-cylinder unit is greater than the opening piston surface of the at least one longitudinal piston-cylinder unit. The ratio between the closing piston surface and the opening piston surface of the at least one transverse piston-cylinder unit is greater than the ratio between the closing piston surface and the opening piston surface of the at least one longitudinal piston-cylinder unit.

Inventors: Tichy; Thomas (Feldkirch, AT)

Assignee: VAT Holding AG

International Classification: F16K 25/00 (20060101)

Expiration Date: 1/03/02017