Overload protection in presses

US4492154A · kind A · utility

Assignee

• L. Schuler GmbH · DE

Inventors

• Werner Rupp · Bischofswerda, DE
• Johannes Koch · Braunschweig, DE

Key dates

• Filing date: Jan 20, 1984
• Grant date: Jan 8, 1985
• Expiry date: Jan 20, 2004

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B30B15/284
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

An overload protection for presses in which the working stages are protected against overload by balance-like overload pressure-responsive devices; to further protect the press balance-like adding pressure-responsive devices are also used whose operating point adjusted to the limit loads of the connecting rods is adjusted to a smaller value than the sum of all of the balance-like overload pressure-responsive devices; the adding pressure-responsive devices are connected in parallel since the pressure space of each balance-like overload pressure-responsive device is connected to one pressure space each of each adding pressure-responsive device; the cross sectional areas of the pistons of the balance-like adding pressure-responsive devices are calculated from the distance of the working stages to the actuating planes; for the left adding pressure-responsive device, from the distance of the working stages to the right actuating plane whereas for the right adding pressure-responsive device, from the distance of the working stages to the left actuating plane. The pre-pressure in the pressure spaces is adjusted by way of pressure control devices supplied by pump aggregates.