Patents by Inventor Willem C. Hammink

Willem C. Hammink 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).

  • Hoisting apparatus having improved clamping means
    Patent number: 4133570
    Abstract: A hoisting apparatus includes a hoisting shank slidably engaged with a yoke, the yoke having parallelogram linkages which carry a pair of gripping jaws. The shank is connected with the jaws to spread them apart as the shank moves downwardly with respect to the yoke, and is provided with locking mechanism normally connecting the shank directly to the yoke. A work-engaging mechanism automatically releases the locking mechanism and allows the shank to shift upwardly with respect to the yoke and cause the jaws to grip a load.
    Type: Grant
    Filed: July 22, 1977
    Date of Patent: January 9, 1979
    Assignee: B. V. Nederlandse Kraanbouw Maatschappij NKM
    Inventors: Willem C. Hammink, Cornelis A. M. Verheul