Patents by Inventor John A. Merrick

John A. Merrick 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: 4280589
    Abstract: An elevating device consists of a base frame, usually mounted on running wheels, a turntable on the base frame, a vertical first post on the turntable and first and second arm means mounted on the post. The first arm means is a parallelogram linkage connecting the first post and a second post, so that the second post stays vertical as it moves up and down. The second post is skewed along its length so that the two arm means can move alongside each other into the stored position; it is therefore exceptionally compact in that position. The second arm means telescopes and a man-carrying platform is pendulously suspended at its outer end. A linkage including a telescoping shaft connects the second post and the platform to hold the platform against inadvertent movements; the linkage includes a spring connection to prevent damage thereto under accidental impacts.
    Type: Grant
    Filed: January 31, 1980
    Date of Patent: July 28, 1981
    Inventor: John A. Merrick