Load test apparatus for hoisting units by means of strain gages

US4140010A · kind A · utility

Assignee

• Demag Aktiengesellschaft

Inventors

• Robert Kulpmann · Wetter, DE
• Peter Stehr · Hagen, DE
• Karl Zacharias · Schwerte, DE
• Paul Muller · Heidelberg, DE

Key dates

• Filing date: Sep 1, 1977
• Grant date: Feb 20, 1979
• Expiry date: Sep 1, 1997

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66D1/58
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

The invention refers to a load test apparatus for hoisting units by means of strain gages, where the test data affect the transmission of a hoisting unit motor. That is, a load test cell is positioned between the fixed support for the hoisting unit and the hoisting cable. The cell is mounted with an upper bolt connecting it to the fixed support and a lower bolt connecting it to the fixed support and the hoisting cable. In the area between the two bolts the flat cell is of restricted cross section and test gages are mounted here to monitor tensile forces in the cell according to the load. The gages are connected, in turn, through a bridging circuit incorporating resistances to the hoist drive. Because of the simplicity and size of the test structure, it can be manufactured economically by simple mass production techniques.