Patents by Inventor Donald D. Quastad

Donald D. Quastad 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).

  • Patent number: 5888019
    Abstract: A walking hoist has a pair of elongated parallel laterally spaced side members with opposite ends. A downwardly extending leg with upper and lower ends is rigidly secured to the ends of each side member. A pair of U-shaped crank members are rotatably secured to and extend between adjacent ends of the side members. The U-shaped cranks each have a bearing member secured to the upper ends of the legs. The crank arms are secured to the bearings and extend radially therefrom in a parallel direction and terminate in an outer end. A horizontal shaft extends between pairs of said crank arms at each end of the legs of the side members. The crank arms are longer than the legs. A circular drive disk is rigidly and operatively secured to the lower ends of the crank arms adjacent the opposite ends of at least one of the side members. A rotational drive assembly is operatively connected to the drive disk to rotate the drive disk in unison in the same direction.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: March 30, 1999
    Inventor: Donald D. Quastad