Patents by Inventor Erhard Kirsten

Erhard Kirsten has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus for preventing the tilting of telescopic jib cranes
    Patent number: 3987906
    Abstract: Apparatus for preventing the tilting of a telescopic jib crane wherein a hydraulic cylinder is provided for raising the jib. The apparatus includes switches for monitoring the cylinder pressure and the elevation of telescopic position of the jib. Preselected ranges of cylinder pressure are permitted corresponding to predetermined jib elevations and telescopic positions. Above these limits, operations of the crane which would increase the tilting moment are terminated.
    Type: Grant
    Filed: December 19, 1974
    Date of Patent: October 26, 1976
    Inventor: Erhard Kirsten