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US 6,622,990 B2Granted
Human power amplifier for lifting load with slack prevention apparatus
OwnerHomayoon Kazerooniinventor
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OwnerHomayoon Kazerooniinventor
Estimating the term…
A human power amplifier includes an end-effector that is grasped by a human operator and applied to a load. The end-effector is suspended, via a line, from a take-up pulley, winch, or drum that is driven by an actuator to lift or lower the load. The end-effector includes a force sensor that measures the vertical force imposed on the end-effector by the operator and delivers a signal to a controller. The controller and actuator are structured in such a way that a predetermined percentage of the force necessary to lift or lower the load is applied by the actuator, with the remaining force being supplied by the operator. The load thus feels lighter to the operator, but the operator does not lose the sense of lifting against both the gravitation and inertial forces originating in the load.
A controller for a pulley hoist arrangement, said controller, among other signals, receiving a first electric signal representative of an operator force on an end-effector connectable to a line, said line for supporting a load and wound on the pulley, and a second signal representative of a tensile force on the line, the controller being arranged to have an output terminal for controlling rotational speed of the pulley as a function of the first and second signals.
Dependencies are inferred from the claim text.