Demag Aktiengesellschaft

Robert Kulpmann

Karl Zacharias

Peter Stehr

Paul Muller

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.

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Wetter, Germany

Robert Kulpmann