Patents by Inventor James D. Griswold

James D. Griswold 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: 3945462
    Abstract: Hanger brackets for suspending working scaffold or platform floors from overhead supports. Paired legs adjustably and pivotally joined together in scissors arrangement have finger ends for engaging overhead beams or elements thereof as depending portions of the legs that extend beneath the center pivot are moved inwardly. A spreader bar having a plurality of position adjustment openings is engaged between the depending legs to lock the fingers and bracket in place. The lower leg ends also provide a plurality of adjustment openings so the spreader bar may be engaged at alternate elevations for accommodating various staging or joist type components and for facilitating the attachment of safety elements.
    Type: Grant
    Filed: June 18, 1975
    Date of Patent: March 23, 1976
    Inventor: James D. Griswold