Patents by Inventor Newell B. Hanson

Newell B. Hanson 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: 4376360
    Abstract: The present invention is directed to an access door assembly (10) comprised of a frame assembly (12) held in place by a plurality of hoop-shaped rods (14). A door (16) is hinged to frame assembly (12) using a pair of first hinge brackets (18) secured to frame assembly (12), a pair of second hinge brackets (20) secured to door (16) near its vertical centerline, and a connecting rod (22) acting as the hinge pin between the first and second hinge brackets (18, 20). A latch mechanism (24) engages a mid-step member (26) to secure door (16) tightly against a door frame structure (28). In doing so, flexible door (16) bends to conform generally to the curvature of cylindrical silo wall (30).Upper and lower step members (56, 58) are a part of frame assembly (12) and mid-step member (26) is supported by frame assembly (12). Hence the step members acting as ladder rungs are not supported by door (16), but rather by its frame.
    Type: Grant
    Filed: January 26, 1981
    Date of Patent: March 15, 1983
    Assignee: Hanson Silo Company
    Inventor: Newell B. Hanson