Vacuum lifter

US5284416A · kind A · utility

Inventors

• Adolf Schmidt · Adelsheim, DE
• Karl-Heinz Rechener · Bad Kötzting, DE

Key dates

• Filing date: Sep 25, 1991
• Grant date: Feb 8, 1994
• Expiry date: Sep 25, 2011

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66F9/181
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

The invention concerns a vacuum lifter to transport loads with an adhesion surface, comprising at least one suction head suspended from a hoist, said suction comprising at least one annular seal projecting from its suction side, the vacuum chamber(s) enclosed by the annular seal(s) communicating with a vacuum source, a valve furthermore being provided which can be switched between a suction position wherein the vacuum source communicates with the pressure chamber or vacuum chambers and a venting position wherein the communication with the vacuum source is interrupted and the vacuum chamber(s) is (are) vented or fed with compressed air. To assure venting or compressed-air supply immediately upon deposition of the load, the hoist is connected by a fitting 55 to the suction plate 5, said fitting being guided in vertically displaceable manner between two end positions, a sensor or a limit switch 59 being provided to detect the lower end position of the fitting 55 and so cooperating with a control means that following lowering of the fitting 55, the valve 20 shall be switched into the venting position if previously having been in the suction position.