Load hoisting apparatus

Details Load hoisting apparatus Load hoisting apparatus

1998-09-01

2000-06-13

Noori, Max

Measuring and testing

Dynamometers

Responsive to force

7386257, G01L 500

Patent

active

060734965

ABSTRACT:
A hoisting apparatus, includes a handle positioned above a 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, and a control unit for adjusting a lifting force generated by the lifting mechanism. Accommodated in the handle is a load sensor which is connected to the handle and the load-engaging member and outputs to the control unit a signal commensurate with a tensile stress of the load sensor when an operator grabs the handle and lifts or lowers the load whereby the control unit so controls the lifting mechanism that the lifting force is increased during lifting of the load 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 balance, 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.

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