Patent ID: 7234684
Filing Date: 2007-06-26
Classification: B66C,B66D

Abstract:
1. A hoisting device, comprising: a hoisting transmission having shaft and a hoisting load measuring mechanism; said hoisting load measuring mechanism having at least one sensor, said at least one sensor detecting deformation of the shaft produced by the hoisting load, wherein the detected deformation is used as a quantity in determining the hoisting load; wherein said at least one sensor determines the torsion of the shaft; wherein said at least one sensor for detecting the deformation of the shaft detects the torque; wherein said at least one sensor comprises a magnetic field sensor; wherein said at least one sensor works by magnetostriction; wherein said at least one sensor detects deformation without contact; and wherein the shaft has at least one zone of permanent magnetization in a region situated opposite said at least one sensor, the magnetization being oriented essentially longitudinal in die direction of the shaft axis, and said at least one zone of permanent magnetization generates a magnetic field outside the region having a magnetic field component in a circumferential direction in relation to the shaft axis, wherein said magnetic held component is detected by said at least one sensor.