Patent ID: 6073496
Filing Date: 2000-06-13
Classification: B66C,B66D,G01G,G01L

Abstract:
A hoisting apparatus, comprising:a load-engaging member;a handle positioned above the load-engaging member for grabbing by an operator to manually move and guide a load;a lifting mechanism positioned above the handle and operatively connected to the handle via a flexible transmission member;a control unit for adjusting a lifting force of the lifting mechanism; anda load sensor accommodated in the handle and connected to the handle and the load-engaging member, said load sensor outputting to the control unit a signal commensurate with a tensile stress of the load sensor,said control unit so controlling the lifting mechanism that during lifting of the load the lifting force is increased in correspondence to an increasing tensile stress of the load sensor until the lifting force corresponds to a weight force of the load and the load is kept in suspension, and that the lifting force is decreased to zero in correspondence to a decreasing tensile stress of the load sensor when placing the load on a support surface.