Jungheinrich Aktiengesellschaft

Sebastian Lehnart

Bernd David

Uwe Allerding

A pedestrian truck with a drive motor and a handle lever includes a head and a rod, which is articulated to a steering base of the industrial truck about a horizontal axis and in which the drive wheel driven by the drive motor is mounted. A first control or regulating device for the drive motor, a steering motor for auxiliary steering, a second control or regulating device for the steering motor and a sensor device which produces a set signal for the second control or regulating device according to the extent of a steering movement of the handle lever are provided, the handle lever rod acting on the steering base via two horizontally spaced pivot points and at least one sensor being associated to each pivot point to measure the force between the handle lever rod and the steering base. The second control or regulating device produces a control signal for the steering motor from the signals of the two sensors.

Pedestrian truck

A method for determining the weight of a load upon a load support of a hydraulic lifting device, in which the pressure of hydraulic fluid within a lifting cylinder is measured and a stored reference curve representing the relationship between the weight of the load and the hydraulic fluid pressure is determined by multiple measurements of the pressure resulting from loads of known weight and the reference curve. According to the method, the load support is lifted and lowered during a short period upon operator request or automatically to sense the load before and during load lifting and lowering operations and a plurality of pressure measuring values are obtained. A pair of average values of the pressure measuring values for respectively lifting and lowering is generated, as well as a third average value of the pair of average values. The third average value is then applied to the reference curve for determining the weight of the load.

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Hamburg, Germany

Sebastian Lehnart